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 ObjArrayKlass* 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 // Resolved nest-host klass: either true nest-host or self if we are not 195 // nested, or an error occurred resolving or validating the nominated 196 // nest-host. Can also be set directly by JDK API's that establish nest 197 // relationships. 198 // By always being set it makes nest-member access checks simpler. 199 InstanceKlass* _nest_host; 200 201 // The PermittedSubclasses attribute. An array of shorts, where each is a 202 // class info index for the class that is a permitted subclass. 203 Array<jushort>* _permitted_subclasses; 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; 212 213 // Number of heapOopSize words used by non-static fields in this klass 214 // (including inherited fields but after header_size()). 215 int _nonstatic_field_size; 216 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 217 218 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 219 int _itable_len; // length of Java itable (in words) 220 221 // The NestHost attribute. The class info index for the class 222 // that is the nest-host of this class. This data has not been validated. 223 u2 _nest_host_index; 224 u2 _this_class_index; // constant pool entry 225 226 u2 _static_oop_field_count;// number of static oop fields in this klass 227 u2 _java_fields_count; // The number of declared Java fields 228 229 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 230 231 // _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 // Class states are defined as ClassState (see above). 236 // Place the _init_state here to utilize the unused 2-byte after 237 // _idnum_allocated_count. 238 u1 _init_state; // state of class 239 240 // This can be used to quickly discriminate among the four kinds of 241 // InstanceKlass. This should be an enum (?) 242 static const unsigned _kind_other = 0; // concrete InstanceKlass 243 static const unsigned _kind_reference = 1; // InstanceRefKlass 244 static const unsigned _kind_class_loader = 2; // InstanceClassLoaderKlass 245 static const unsigned _kind_mirror = 3; // InstanceMirrorKlass 246 247 u1 _reference_type; // reference type 248 u1 _kind; // kind of InstanceKlass 249 250 enum { 251 _misc_rewritten = 1 << 0, // methods rewritten. 252 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops 253 _misc_should_verify_class = 1 << 2, // allow caching of preverification 254 _misc_is_unsafe_anonymous = 1 << 3, // has embedded _unsafe_anonymous_host field 255 _misc_is_contended = 1 << 4, // marked with contended annotation 256 _misc_has_nonstatic_concrete_methods = 1 << 5, // class/superclass/implemented interfaces has non-static, concrete methods 257 _misc_declares_nonstatic_concrete_methods = 1 << 6, // directly declares non-static, concrete methods 258 _misc_has_been_redefined = 1 << 7, // class has been redefined 259 _misc_has_passed_fingerprint_check = 1 << 8, // when this class was loaded, the fingerprint computed from its 260 // code source was found to be matching the value recorded by AOT. 261 _misc_is_scratch_class = 1 << 9, // class is the redefined scratch class 262 _misc_is_shared_boot_class = 1 << 10, // defining class loader is boot class loader 263 _misc_is_shared_platform_class = 1 << 11, // defining class loader is platform class loader 264 _misc_is_shared_app_class = 1 << 12, // defining class loader is app class loader 265 _misc_has_resolved_methods = 1 << 13, // resolved methods table entries added for this class 266 _misc_is_being_redefined = 1 << 14, // used for locking redefinition 267 _misc_has_contended_annotations = 1 << 15 // has @Contended annotation 268 }; 269 u2 shared_loader_type_bits() const { 270 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class; 271 } 272 u2 _misc_flags; // There is more space in access_flags for more flags. 273 274 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 #if INCLUDE_JVMTI 291 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 292 #endif 293 294 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 295 296 // Method array. 297 Array<Method*>* _methods; 298 // Default Method Array, concrete methods inherited from interfaces 299 Array<Method*>* _default_methods; 300 // Interfaces (InstanceKlass*s) this class declares locally to implement. 301 Array<InstanceKlass*>* _local_interfaces; 302 // Interfaces (InstanceKlass*s) this class implements transitively. 303 Array<InstanceKlass*>* _transitive_interfaces; 304 // Int array containing the original order of method in the class file (for JVMTI). 305 Array<int>* _method_ordering; 306 // Int array containing the vtable_indices for default_methods 307 // offset matches _default_methods offset 308 Array<int>* _default_vtable_indices; 309 310 // Instance and static variable information, starts with 6-tuples of shorts 311 // [access, name index, sig index, initval index, low_offset, high_offset] 312 // for all fields, followed by the generic signature data at the end of 313 // the array. Only fields with generic signature attributes have the generic 314 // signature data set in the array. The fields array looks like following: 315 // 316 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 317 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 318 // ... 319 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 320 // [generic signature index] 321 // [generic signature index] 322 // ... 323 Array<u2>* _fields; 324 325 // embedded Java vtable follows here 326 // embedded Java itables follows here 327 // embedded static fields follows here 328 // embedded nonstatic oop-map blocks follows here 329 // embedded implementor of this interface follows here 330 // The embedded implementor only exists if the current klass is an 331 // iterface. The possible values of the implementor fall into following 332 // three cases: 333 // NULL: no implementor. 334 // A Klass* that's not itself: one implementor. 335 // Itself: more than one implementors. 336 // embedded unsafe_anonymous_host klass follows here 337 // The embedded host klass only exists in an unsafe anonymous class for 338 // dynamic language support (JSR 292 enabled). The host class grants 339 // its access privileges to this class also. The host class is either 340 // named, or a previously loaded unsafe anonymous class. A non-anonymous class 341 // or an anonymous class loaded through normal classloading does not 342 // have this embedded field. 343 // 344 345 friend class SystemDictionary; 346 347 static bool _disable_method_binary_search; 348 349 public: 350 // The three BUILTIN class loader types 351 bool is_shared_boot_class() const { 352 return (_misc_flags & _misc_is_shared_boot_class) != 0; 353 } 354 bool is_shared_platform_class() const { 355 return (_misc_flags & _misc_is_shared_platform_class) != 0; 356 } 357 bool is_shared_app_class() const { 358 return (_misc_flags & _misc_is_shared_app_class) != 0; 359 } 360 // The UNREGISTERED class loader type 361 bool is_shared_unregistered_class() const { 362 return (_misc_flags & shared_loader_type_bits()) == 0; 363 } 364 365 void clear_shared_class_loader_type() { 366 _misc_flags &= ~shared_loader_type_bits(); 367 } 368 369 void set_shared_class_loader_type(s2 loader_type); 370 371 void assign_class_loader_type(); 372 373 bool has_nonstatic_fields() const { 374 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 375 } 376 void set_has_nonstatic_fields(bool b) { 377 if (b) { 378 _misc_flags |= _misc_has_nonstatic_fields; 379 } else { 380 _misc_flags &= ~_misc_has_nonstatic_fields; 381 } 382 } 383 384 // field sizes 385 int nonstatic_field_size() const { return _nonstatic_field_size; } 386 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 387 388 int static_field_size() const { return _static_field_size; } 389 void set_static_field_size(int size) { _static_field_size = size; } 390 391 int static_oop_field_count() const { return (int)_static_oop_field_count; } 392 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 393 394 // Java itable 395 int itable_length() const { return _itable_len; } 396 void set_itable_length(int len) { _itable_len = len; } 397 398 // array klasses 399 ObjArrayKlass* array_klasses() const { return _array_klasses; } 400 inline ObjArrayKlass* array_klasses_acquire() const; // load with acquire semantics 401 void set_array_klasses(ObjArrayKlass* k) { _array_klasses = k; } 402 inline void release_set_array_klasses(ObjArrayKlass* k); // store with release semantics 403 404 // methods 405 Array<Method*>* methods() const { return _methods; } 406 void set_methods(Array<Method*>* a) { _methods = a; } 407 Method* method_with_idnum(int idnum); 408 Method* method_with_orig_idnum(int idnum); 409 Method* method_with_orig_idnum(int idnum, int version); 410 411 // method ordering 412 Array<int>* method_ordering() const { return _method_ordering; } 413 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 414 void copy_method_ordering(const intArray* m, TRAPS); 415 416 // default_methods 417 Array<Method*>* default_methods() const { return _default_methods; } 418 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 419 420 // default method vtable_indices 421 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 422 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 423 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 424 425 // interfaces 426 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; } 427 void set_local_interfaces(Array<InstanceKlass*>* a) { 428 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 429 _local_interfaces = a; } 430 431 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; } 432 void set_transitive_interfaces(Array<InstanceKlass*>* a) { 433 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 434 _transitive_interfaces = a; 435 } 436 437 private: 438 friend class fieldDescriptor; 439 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 440 441 public: 442 int field_offset (int index) const { return field(index)->offset(); } 443 int field_access_flags(int index) const { return field(index)->access_flags(); } 444 Symbol* field_name (int index) const { return field(index)->name(constants()); } 445 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 446 447 // Number of Java declared fields 448 int java_fields_count() const { return (int)_java_fields_count; } 449 450 Array<u2>* fields() const { return _fields; } 451 void set_fields(Array<u2>* f, u2 java_fields_count) { 452 guarantee(_fields == NULL || f == NULL, "Just checking"); 453 _fields = f; 454 _java_fields_count = java_fields_count; 455 } 456 457 // inner classes 458 Array<u2>* inner_classes() const { return _inner_classes; } 459 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 460 461 // nest members 462 Array<u2>* nest_members() const { return _nest_members; } 463 void set_nest_members(Array<u2>* m) { _nest_members = m; } 464 465 // nest-host index 466 jushort nest_host_index() const { return _nest_host_index; } 467 void set_nest_host_index(u2 i) { _nest_host_index = i; } 468 // dynamic nest member support 469 void set_nest_host(InstanceKlass* host, TRAPS); 470 471 // record components 472 Array<RecordComponent*>* record_components() const { return _record_components; } 473 void set_record_components(Array<RecordComponent*>* record_components) { 474 _record_components = record_components; 475 } 476 bool is_record() const { return _record_components != NULL; } 477 478 // permitted subclasses 479 Array<u2>* permitted_subclasses() const { return _permitted_subclasses; } 480 void set_permitted_subclasses(Array<u2>* s) { _permitted_subclasses = s; } 481 482 private: 483 // Called to verify that k is a member of this nest - does not look at k's nest-host 484 bool has_nest_member(InstanceKlass* k, TRAPS) const; 485 486 public: 487 // Used to construct informative IllegalAccessError messages at a higher level, 488 // if there was an issue resolving or validating the nest host. 489 // Returns NULL if there was no error. 490 const char* nest_host_error(TRAPS); 491 // Returns nest-host class, resolving and validating it if needed. 492 // Returns NULL if resolution is not possible from the calling context. 493 InstanceKlass* nest_host(TRAPS); 494 // Check if this klass is a nestmate of k - resolves this nest-host and k's 495 bool has_nestmate_access_to(InstanceKlass* k, TRAPS); 496 497 // Called to verify that k is a permitted subclass of this class 498 bool has_as_permitted_subclass(const InstanceKlass* k) const; 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(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS); 523 // If the package for the InstanceKlass is in the boot loader's package entry 524 // table then sets the classpath_index field so that 525 // get_system_package() will know to return a non-null value for the 526 // package's location. And, so that the package will be added to the list of 527 // packages returned by get_system_packages(). 528 // For packages whose classes are loaded from the boot loader class path, the 529 // classpath_index indicates which entry on the boot loader class path. 530 void set_classpath_index(s2 path_index, TRAPS); 531 bool is_same_class_package(const Klass* class2) const; 532 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const; 533 534 // find an enclosing class 535 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const; 536 537 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index. 538 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const; 539 540 private: 541 // Check prohibited package ("java/" only loadable by boot or platform loaders) 542 static void check_prohibited_package(Symbol* class_name, 543 ClassLoaderData* loader_data, 544 TRAPS); 545 public: 546 // initialization state 547 bool is_loaded() const { return _init_state >= loaded; } 548 bool is_linked() const { return _init_state >= linked; } 549 bool is_initialized() const { return _init_state == fully_initialized; } 550 bool is_not_initialized() const { return _init_state < being_initialized; } 551 bool is_being_initialized() const { return _init_state == being_initialized; } 552 bool is_in_error_state() const { return _init_state == initialization_error; } 553 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 554 ClassState init_state() { return (ClassState)_init_state; } 555 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 556 557 // is this a sealed class 558 bool is_sealed() const; 559 560 // defineClass specified verification 561 bool should_verify_class() const { 562 return (_misc_flags & _misc_should_verify_class) != 0; 563 } 564 void set_should_verify_class(bool value) { 565 if (value) { 566 _misc_flags |= _misc_should_verify_class; 567 } else { 568 _misc_flags &= ~_misc_should_verify_class; 569 } 570 } 571 572 // marking 573 bool is_marked_dependent() const { return _is_marked_dependent; } 574 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 575 576 // initialization (virtuals from Klass) 577 bool should_be_initialized() const; // means that initialize should be called 578 void initialize(TRAPS); 579 void link_class(TRAPS); 580 bool link_class_or_fail(TRAPS); // returns false on failure 581 void rewrite_class(TRAPS); 582 void link_methods(TRAPS); 583 Method* class_initializer() const; 584 585 // set the class to initialized if no static initializer is present 586 void eager_initialize(Thread *thread); 587 588 // reference type 589 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 590 void set_reference_type(ReferenceType t) { 591 assert(t == (u1)t, "overflow"); 592 _reference_type = (u1)t; 593 } 594 595 // this class cp index 596 u2 this_class_index() const { return _this_class_index; } 597 void set_this_class_index(u2 index) { _this_class_index = index; } 598 599 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 600 601 // find local field, returns true if found 602 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 603 // find field in direct superinterfaces, returns the interface in which the field is defined 604 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 605 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 606 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 607 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 608 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 609 610 // find a non-static or static field given its offset within the class. 611 bool contains_field_offset(int offset); 612 613 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 614 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 615 616 private: 617 inline static int quick_search(const Array<Method*>* methods, const Symbol* name); 618 619 public: 620 static void disable_method_binary_search() { 621 _disable_method_binary_search = true; 622 } 623 624 // find a local method (returns NULL if not found) 625 Method* find_method(const Symbol* name, const Symbol* signature) const; 626 static Method* find_method(const Array<Method*>* methods, 627 const Symbol* name, 628 const Symbol* signature); 629 630 // find a local method, but skip static methods 631 Method* find_instance_method(const Symbol* name, const Symbol* signature, 632 PrivateLookupMode private_mode) const; 633 static Method* find_instance_method(const Array<Method*>* methods, 634 const Symbol* name, 635 const Symbol* signature, 636 PrivateLookupMode private_mode); 637 638 // find a local method (returns NULL if not found) 639 Method* find_local_method(const Symbol* name, 640 const Symbol* signature, 641 OverpassLookupMode overpass_mode, 642 StaticLookupMode static_mode, 643 PrivateLookupMode private_mode) const; 644 645 // find a local method from given methods array (returns NULL if not found) 646 static Method* find_local_method(const Array<Method*>* methods, 647 const Symbol* name, 648 const Symbol* signature, 649 OverpassLookupMode overpass_mode, 650 StaticLookupMode static_mode, 651 PrivateLookupMode private_mode); 652 653 // find a local method index in methods or default_methods (returns -1 if not found) 654 static int find_method_index(const Array<Method*>* methods, 655 const Symbol* name, 656 const Symbol* signature, 657 OverpassLookupMode overpass_mode, 658 StaticLookupMode static_mode, 659 PrivateLookupMode private_mode); 660 661 // lookup operation (returns NULL if not found) 662 Method* uncached_lookup_method(const Symbol* name, 663 const Symbol* signature, 664 OverpassLookupMode overpass_mode, 665 PrivateLookupMode private_mode = PrivateLookupMode::find) const; 666 667 // lookup a method in all the interfaces that this class implements 668 // (returns NULL if not found) 669 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 670 671 // lookup a method in local defaults then in all interfaces 672 // (returns NULL if not found) 673 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 674 675 // Find method indices by name. If a method with the specified name is 676 // found the index to the first method is returned, and 'end' is filled in 677 // with the index of first non-name-matching method. If no method is found 678 // -1 is returned. 679 int find_method_by_name(const Symbol* name, int* end) const; 680 static int find_method_by_name(const Array<Method*>* methods, 681 const Symbol* name, int* end); 682 683 // constant pool 684 ConstantPool* constants() const { return _constants; } 685 void set_constants(ConstantPool* c) { _constants = c; } 686 687 // protection domain 688 oop protection_domain() const; 689 690 // signers 691 objArrayOop signers() const; 692 693 // host class 694 InstanceKlass* unsafe_anonymous_host() const { 695 InstanceKlass** hk = adr_unsafe_anonymous_host(); 696 if (hk == NULL) { 697 assert(!is_unsafe_anonymous(), "Unsafe anonymous classes have host klasses"); 698 return NULL; 699 } else { 700 assert(*hk != NULL, "host klass should always be set if the address is not null"); 701 assert(is_unsafe_anonymous(), "Only unsafe anonymous classes have host klasses"); 702 return *hk; 703 } 704 } 705 void set_unsafe_anonymous_host(const InstanceKlass* host) { 706 assert(is_unsafe_anonymous(), "not unsafe anonymous"); 707 const InstanceKlass** addr = (const InstanceKlass **)adr_unsafe_anonymous_host(); 708 assert(addr != NULL, "no reversed space"); 709 if (addr != NULL) { 710 *addr = host; 711 } 712 } 713 bool is_unsafe_anonymous() const { 714 return (_misc_flags & _misc_is_unsafe_anonymous) != 0; 715 } 716 void set_is_unsafe_anonymous(bool value) { 717 if (value) { 718 _misc_flags |= _misc_is_unsafe_anonymous; 719 } else { 720 _misc_flags &= ~_misc_is_unsafe_anonymous; 721 } 722 } 723 724 bool is_contended() const { 725 return (_misc_flags & _misc_is_contended) != 0; 726 } 727 void set_is_contended(bool value) { 728 if (value) { 729 _misc_flags |= _misc_is_contended; 730 } else { 731 _misc_flags &= ~_misc_is_contended; 732 } 733 } 734 735 // source file name 736 Symbol* source_file_name() const { return _constants->source_file_name(); } 737 u2 source_file_name_index() const { return _constants->source_file_name_index(); } 738 void set_source_file_name_index(u2 sourcefile_index) { _constants->set_source_file_name_index(sourcefile_index); } 739 740 // minor and major version numbers of class file 741 u2 minor_version() const { return _constants->minor_version(); } 742 void set_minor_version(u2 minor_version) { _constants->set_minor_version(minor_version); } 743 u2 major_version() const { return _constants->major_version(); } 744 void set_major_version(u2 major_version) { _constants->set_major_version(major_version); } 745 746 // source debug extension 747 const char* source_debug_extension() const { return _source_debug_extension; } 748 void set_source_debug_extension(const char* array, int length); 749 750 // nonstatic oop-map blocks 751 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 752 return oop_map_count * OopMapBlock::size_in_words(); 753 } 754 unsigned int nonstatic_oop_map_count() const { 755 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 756 } 757 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 758 void set_nonstatic_oop_map_size(int words) { 759 _nonstatic_oop_map_size = words; 760 } 761 762 bool has_contended_annotations() const { 763 return ((_misc_flags & _misc_has_contended_annotations) != 0); 764 } 765 void set_has_contended_annotations(bool value) { 766 if (value) { 767 _misc_flags |= _misc_has_contended_annotations; 768 } else { 769 _misc_flags &= ~_misc_has_contended_annotations; 770 } 771 } 772 773 #if INCLUDE_JVMTI 774 // Redefinition locking. Class can only be redefined by one thread at a time. 775 bool is_being_redefined() const { 776 return ((_misc_flags & _misc_is_being_redefined) != 0); 777 } 778 void set_is_being_redefined(bool value) { 779 if (value) { 780 _misc_flags |= _misc_is_being_redefined; 781 } else { 782 _misc_flags &= ~_misc_is_being_redefined; 783 } 784 } 785 786 // RedefineClasses() support for previous versions: 787 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 788 void purge_previous_version_list(); 789 790 InstanceKlass* previous_versions() const { return _previous_versions; } 791 #else 792 InstanceKlass* previous_versions() const { return NULL; } 793 #endif 794 795 InstanceKlass* get_klass_version(int version) { 796 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 797 if (ik->constants()->version() == version) { 798 return ik; 799 } 800 } 801 return NULL; 802 } 803 804 bool has_been_redefined() const { 805 return (_misc_flags & _misc_has_been_redefined) != 0; 806 } 807 void set_has_been_redefined() { 808 _misc_flags |= _misc_has_been_redefined; 809 } 810 811 bool has_passed_fingerprint_check() const { 812 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0; 813 } 814 void set_has_passed_fingerprint_check(bool b) { 815 if (b) { 816 _misc_flags |= _misc_has_passed_fingerprint_check; 817 } else { 818 _misc_flags &= ~_misc_has_passed_fingerprint_check; 819 } 820 } 821 bool supers_have_passed_fingerprint_checks(); 822 823 static bool should_store_fingerprint(bool is_hidden_or_anonymous); 824 bool should_store_fingerprint() const { return should_store_fingerprint(is_hidden() || is_unsafe_anonymous()); } 825 bool has_stored_fingerprint() const; 826 uint64_t get_stored_fingerprint() const; 827 void store_fingerprint(uint64_t fingerprint); 828 829 bool is_scratch_class() const { 830 return (_misc_flags & _misc_is_scratch_class) != 0; 831 } 832 833 void set_is_scratch_class() { 834 _misc_flags |= _misc_is_scratch_class; 835 } 836 837 bool has_resolved_methods() const { 838 return (_misc_flags & _misc_has_resolved_methods) != 0; 839 } 840 841 void set_has_resolved_methods() { 842 _misc_flags |= _misc_has_resolved_methods; 843 } 844 private: 845 846 void set_kind(unsigned kind) { 847 _kind = (u1)kind; 848 } 849 850 bool is_kind(unsigned desired) const { 851 return _kind == (u1)desired; 852 } 853 854 public: 855 856 // Other is anything that is not one of the more specialized kinds of InstanceKlass. 857 bool is_other_instance_klass() const { return is_kind(_kind_other); } 858 bool is_reference_instance_klass() const { return is_kind(_kind_reference); } 859 bool is_mirror_instance_klass() const { return is_kind(_kind_mirror); } 860 bool is_class_loader_instance_klass() const { return is_kind(_kind_class_loader); } 861 862 #if INCLUDE_JVMTI 863 864 void init_previous_versions() { 865 _previous_versions = NULL; 866 } 867 868 private: 869 static bool _has_previous_versions; 870 public: 871 static void purge_previous_versions(InstanceKlass* ik) { 872 if (ik->has_been_redefined()) { 873 ik->purge_previous_version_list(); 874 } 875 } 876 877 static bool has_previous_versions_and_reset(); 878 static bool has_previous_versions() { return _has_previous_versions; } 879 880 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 881 void set_cached_class_file(JvmtiCachedClassFileData *data) { 882 _cached_class_file = data; 883 } 884 JvmtiCachedClassFileData * get_cached_class_file(); 885 jint get_cached_class_file_len(); 886 unsigned char * get_cached_class_file_bytes(); 887 888 // JVMTI: Support for caching of field indices, types, and offsets 889 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 890 _jvmti_cached_class_field_map = descriptor; 891 } 892 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 893 return _jvmti_cached_class_field_map; 894 } 895 #else // INCLUDE_JVMTI 896 897 static void purge_previous_versions(InstanceKlass* ik) { return; }; 898 static bool has_previous_versions_and_reset() { return false; } 899 900 void set_cached_class_file(JvmtiCachedClassFileData *data) { 901 assert(data == NULL, "unexpected call with JVMTI disabled"); 902 } 903 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; } 904 905 #endif // INCLUDE_JVMTI 906 907 bool has_nonstatic_concrete_methods() const { 908 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0; 909 } 910 void set_has_nonstatic_concrete_methods(bool b) { 911 if (b) { 912 _misc_flags |= _misc_has_nonstatic_concrete_methods; 913 } else { 914 _misc_flags &= ~_misc_has_nonstatic_concrete_methods; 915 } 916 } 917 918 bool declares_nonstatic_concrete_methods() const { 919 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0; 920 } 921 void set_declares_nonstatic_concrete_methods(bool b) { 922 if (b) { 923 _misc_flags |= _misc_declares_nonstatic_concrete_methods; 924 } else { 925 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods; 926 } 927 } 928 929 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 930 inline u2 next_method_idnum(); 931 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 932 933 // generics support 934 Symbol* generic_signature() const { return _constants->generic_signature(); } 935 u2 generic_signature_index() const { return _constants->generic_signature_index(); } 936 void set_generic_signature_index(u2 sig_index) { _constants->set_generic_signature_index(sig_index); } 937 938 u2 enclosing_method_data(int offset) const; 939 u2 enclosing_method_class_index() const { 940 return enclosing_method_data(enclosing_method_class_index_offset); 941 } 942 u2 enclosing_method_method_index() { 943 return enclosing_method_data(enclosing_method_method_index_offset); 944 } 945 void set_enclosing_method_indices(u2 class_index, 946 u2 method_index); 947 948 // jmethodID support 949 jmethodID get_jmethod_id(const methodHandle& method_h); 950 jmethodID get_jmethod_id_fetch_or_update(size_t idnum, 951 jmethodID new_id, jmethodID* new_jmeths, 952 jmethodID* to_dealloc_id_p, 953 jmethodID** to_dealloc_jmeths_p); 954 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 955 size_t *length_p, jmethodID* id_p); 956 void ensure_space_for_methodids(int start_offset = 0); 957 jmethodID jmethod_id_or_null(Method* method); 958 959 // annotations support 960 Annotations* annotations() const { return _annotations; } 961 void set_annotations(Annotations* anno) { _annotations = anno; } 962 963 AnnotationArray* class_annotations() const { 964 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 965 } 966 Array<AnnotationArray*>* fields_annotations() const { 967 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 968 } 969 AnnotationArray* class_type_annotations() const { 970 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 971 } 972 Array<AnnotationArray*>* fields_type_annotations() const { 973 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 974 } 975 // allocation 976 instanceOop allocate_instance(TRAPS); 977 static instanceOop allocate_instance(oop cls, TRAPS); 978 979 // additional member function to return a handle 980 instanceHandle allocate_instance_handle(TRAPS); 981 982 objArrayOop allocate_objArray(int n, int length, TRAPS); 983 // Helper function 984 static instanceOop register_finalizer(instanceOop i, TRAPS); 985 986 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 987 // if not, throw either an Error or an Exception. 988 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 989 990 // initialization 991 void call_class_initializer(TRAPS); 992 void set_initialization_state_and_notify(ClassState state, TRAPS); 993 994 // OopMapCache support 995 OopMapCache* oop_map_cache() { return _oop_map_cache; } 996 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 997 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 998 999 // JNI identifier support (for static fields - for jni performance) 1000 JNIid* jni_ids() { return _jni_ids; } 1001 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 1002 JNIid* jni_id_for(int offset); 1003 1004 // maintenance of deoptimization dependencies 1005 inline DependencyContext dependencies(); 1006 int mark_dependent_nmethods(KlassDepChange& changes); 1007 void add_dependent_nmethod(nmethod* nm); 1008 void remove_dependent_nmethod(nmethod* nm); 1009 void clean_dependency_context(); 1010 1011 // On-stack replacement support 1012 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 1013 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 1014 void add_osr_nmethod(nmethod* n); 1015 bool remove_osr_nmethod(nmethod* n); 1016 int mark_osr_nmethods(const Method* m); 1017 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 1018 1019 #if INCLUDE_JVMTI 1020 // Breakpoint support (see methods on Method* for details) 1021 BreakpointInfo* breakpoints() const { return _breakpoints; }; 1022 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 1023 #endif 1024 1025 // support for stub routines 1026 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 1027 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;) 1028 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 1029 1030 // subclass/subinterface checks 1031 bool implements_interface(Klass* k) const; 1032 bool is_same_or_direct_interface(Klass* k) const; 1033 1034 #ifdef ASSERT 1035 // check whether this class or one of its superclasses was redefined 1036 bool has_redefined_this_or_super() const; 1037 #endif 1038 1039 // Access to the implementor of an interface. 1040 Klass* implementor() const; 1041 void set_implementor(Klass* k); 1042 int nof_implementors() const; 1043 void add_implementor(Klass* k); // k is a new class that implements this interface 1044 void init_implementor(); // initialize 1045 1046 // link this class into the implementors list of every interface it implements 1047 void process_interfaces(Thread *thread); 1048 1049 // virtual operations from Klass 1050 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 1051 Array<InstanceKlass*>* transitive_interfaces); 1052 bool can_be_primary_super_slow() const; 1053 int oop_size(oop obj) const { return size_helper(); } 1054 // slow because it's a virtual call and used for verifying the layout_helper. 1055 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 1056 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 1057 1058 // Iterators 1059 void do_local_static_fields(FieldClosure* cl); 1060 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 1061 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 1062 1063 void methods_do(void f(Method* method)); 1064 void array_klasses_do(void f(Klass* k)); 1065 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 1066 1067 static InstanceKlass* cast(Klass* k) { 1068 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 1069 } 1070 1071 static const InstanceKlass* cast(const Klass* k) { 1072 assert(k != NULL, "k should not be null"); 1073 assert(k->is_instance_klass(), "cast to InstanceKlass"); 1074 return static_cast<const InstanceKlass*>(k); 1075 } 1076 1077 virtual InstanceKlass* java_super() const { 1078 return (super() == NULL) ? NULL : cast(super()); 1079 } 1080 1081 // Sizing (in words) 1082 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 1083 1084 static int size(int vtable_length, int itable_length, 1085 int nonstatic_oop_map_size, 1086 bool is_interface, bool is_unsafe_anonymous, bool has_stored_fingerprint) { 1087 return align_metadata_size(header_size() + 1088 vtable_length + 1089 itable_length + 1090 nonstatic_oop_map_size + 1091 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) + 1092 (is_unsafe_anonymous ? (int)sizeof(Klass*)/wordSize : 0) + 1093 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0)); 1094 } 1095 int size() const { return size(vtable_length(), 1096 itable_length(), 1097 nonstatic_oop_map_size(), 1098 is_interface(), 1099 is_unsafe_anonymous(), 1100 has_stored_fingerprint()); 1101 } 1102 1103 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); } 1104 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 1105 1106 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 1107 1108 oop static_field_base_raw() { return java_mirror(); } 1109 1110 OopMapBlock* start_of_nonstatic_oop_maps() const { 1111 return (OopMapBlock*)(start_of_itable() + itable_length()); 1112 } 1113 1114 Klass** end_of_nonstatic_oop_maps() const { 1115 return (Klass**)(start_of_nonstatic_oop_maps() + 1116 nonstatic_oop_map_count()); 1117 } 1118 1119 Klass* volatile* adr_implementor() const { 1120 if (is_interface()) { 1121 return (Klass* volatile*)end_of_nonstatic_oop_maps(); 1122 } else { 1123 return NULL; 1124 } 1125 }; 1126 1127 InstanceKlass** adr_unsafe_anonymous_host() const { 1128 if (is_unsafe_anonymous()) { 1129 InstanceKlass** adr_impl = (InstanceKlass**)adr_implementor(); 1130 if (adr_impl != NULL) { 1131 return adr_impl + 1; 1132 } else { 1133 return (InstanceKlass **)end_of_nonstatic_oop_maps(); 1134 } 1135 } else { 1136 return NULL; 1137 } 1138 } 1139 1140 address adr_fingerprint() const { 1141 if (has_stored_fingerprint()) { 1142 InstanceKlass** adr_host = adr_unsafe_anonymous_host(); 1143 if (adr_host != NULL) { 1144 return (address)(adr_host + 1); 1145 } 1146 1147 Klass* volatile* adr_impl = adr_implementor(); 1148 if (adr_impl != NULL) { 1149 return (address)(adr_impl + 1); 1150 } 1151 1152 return (address)end_of_nonstatic_oop_maps(); 1153 } else { 1154 return NULL; 1155 } 1156 } 1157 1158 // Use this to return the size of an instance in heap words: 1159 int size_helper() const { 1160 return layout_helper_to_size_helper(layout_helper()); 1161 } 1162 1163 // This bit is initialized in classFileParser.cpp. 1164 // It is false under any of the following conditions: 1165 // - the class is abstract (including any interface) 1166 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1167 // - the class size is larger than FastAllocateSizeLimit 1168 // - the class is java/lang/Class, which cannot be allocated directly 1169 bool can_be_fastpath_allocated() const { 1170 return !layout_helper_needs_slow_path(layout_helper()); 1171 } 1172 1173 // Java itable 1174 klassItable itable() const; // return klassItable wrapper 1175 Method* method_at_itable(Klass* holder, int index, TRAPS); 1176 1177 #if INCLUDE_JVMTI 1178 void adjust_default_methods(bool* trace_name_printed); 1179 #endif // INCLUDE_JVMTI 1180 1181 void clean_weak_instanceklass_links(); 1182 private: 1183 void clean_implementors_list(); 1184 void clean_method_data(); 1185 1186 public: 1187 // Explicit metaspace deallocation of fields 1188 // For RedefineClasses and class file parsing errors, we need to deallocate 1189 // instanceKlasses and the metadata they point to. 1190 void deallocate_contents(ClassLoaderData* loader_data); 1191 static void deallocate_methods(ClassLoaderData* loader_data, 1192 Array<Method*>* methods); 1193 void static deallocate_interfaces(ClassLoaderData* loader_data, 1194 const Klass* super_klass, 1195 Array<InstanceKlass*>* local_interfaces, 1196 Array<InstanceKlass*>* transitive_interfaces); 1197 void static deallocate_record_components(ClassLoaderData* loader_data, 1198 Array<RecordComponent*>* record_component); 1199 1200 // The constant pool is on stack if any of the methods are executing or 1201 // referenced by handles. 1202 bool on_stack() const { return _constants->on_stack(); } 1203 1204 // callbacks for actions during class unloading 1205 static void unload_class(InstanceKlass* ik); 1206 1207 virtual void release_C_heap_structures(); 1208 1209 // Naming 1210 const char* signature_name() const; 1211 1212 // Oop fields (and metadata) iterators 1213 // 1214 // The InstanceKlass iterators also visits the Object's klass. 1215 1216 // Forward iteration 1217 public: 1218 // Iterate over all oop fields in the oop maps. 1219 template <typename T, class OopClosureType> 1220 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1221 1222 // Iterate over all oop fields and metadata. 1223 template <typename T, class OopClosureType> 1224 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 1225 1226 // Iterate over all oop fields in one oop map. 1227 template <typename T, class OopClosureType> 1228 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1229 1230 1231 // Reverse iteration 1232 // Iterate over all oop fields and metadata. 1233 template <typename T, class OopClosureType> 1234 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1235 1236 private: 1237 // Iterate over all oop fields in the oop maps. 1238 template <typename T, class OopClosureType> 1239 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1240 1241 // Iterate over all oop fields in one oop map. 1242 template <typename T, class OopClosureType> 1243 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1244 1245 1246 // Bounded range iteration 1247 public: 1248 // Iterate over all oop fields in the oop maps. 1249 template <typename T, class OopClosureType> 1250 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1251 1252 // Iterate over all oop fields and metadata. 1253 template <typename T, class OopClosureType> 1254 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1255 1256 private: 1257 // Iterate over all oop fields in one oop map. 1258 template <typename T, class OopClosureType> 1259 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1260 1261 1262 public: 1263 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1264 1265 private: 1266 // initialization state 1267 void set_init_state(ClassState state); 1268 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1269 void set_init_thread(Thread *thread) { _init_thread = thread; } 1270 1271 // The RedefineClasses() API can cause new method idnums to be needed 1272 // which will cause the caches to grow. Safety requires different 1273 // cache management logic if the caches can grow instead of just 1274 // going from NULL to non-NULL. 1275 bool idnum_can_increment() const { return has_been_redefined(); } 1276 inline jmethodID* methods_jmethod_ids_acquire() const; 1277 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1278 1279 // Lock during initialization 1280 public: 1281 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1282 // Must be one per class and it has to be a VM internal object so java code 1283 // cannot lock it (like the mirror). 1284 // It has to be an object not a Mutex because it's held through java calls. 1285 oop init_lock() const; 1286 private: 1287 void fence_and_clear_init_lock(); 1288 1289 bool link_class_impl (TRAPS); 1290 bool verify_code (TRAPS); 1291 void initialize_impl (TRAPS); 1292 void initialize_super_interfaces (TRAPS); 1293 void eager_initialize_impl (); 1294 /* jni_id_for_impl for jfieldID only */ 1295 JNIid* jni_id_for_impl (int offset); 1296 1297 // Returns the array class for the n'th dimension 1298 Klass* array_klass_impl(bool or_null, int n, TRAPS); 1299 1300 // Returns the array class with this class as element type 1301 Klass* array_klass_impl(bool or_null, TRAPS); 1302 1303 // find a local method (returns NULL if not found) 1304 Method* find_method_impl(const Symbol* name, 1305 const Symbol* signature, 1306 OverpassLookupMode overpass_mode, 1307 StaticLookupMode static_mode, 1308 PrivateLookupMode private_mode) const; 1309 1310 static Method* find_method_impl(const Array<Method*>* methods, 1311 const Symbol* name, 1312 const Symbol* signature, 1313 OverpassLookupMode overpass_mode, 1314 StaticLookupMode static_mode, 1315 PrivateLookupMode private_mode); 1316 1317 // Free CHeap allocated fields. 1318 void release_C_heap_structures_internal(); 1319 1320 #if INCLUDE_JVMTI 1321 // RedefineClasses support 1322 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1323 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1324 #endif 1325 // log class name to classlist 1326 void log_to_classlist(const ClassFileStream* cfs) const; 1327 public: 1328 // CDS support - remove and restore oops from metadata. Oops are not shared. 1329 virtual void remove_unshareable_info(); 1330 virtual void remove_java_mirror(); 1331 void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, PackageEntry* pkg_entry, TRAPS); 1332 void init_shared_package_entry(); 1333 1334 // jvm support 1335 jint compute_modifier_flags(TRAPS) const; 1336 1337 public: 1338 // JVMTI support 1339 jint jvmti_class_status() const; 1340 1341 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 1342 1343 public: 1344 // Printing 1345 #ifndef PRODUCT 1346 void print_on(outputStream* st) const; 1347 #endif 1348 void print_value_on(outputStream* st) const; 1349 1350 void oop_print_value_on(oop obj, outputStream* st); 1351 1352 #ifndef PRODUCT 1353 void oop_print_on (oop obj, outputStream* st); 1354 1355 void print_dependent_nmethods(bool verbose = false); 1356 bool is_dependent_nmethod(nmethod* nm); 1357 bool verify_itable_index(int index); 1358 #endif 1359 1360 const char* internal_name() const; 1361 1362 // Verification 1363 void verify_on(outputStream* st); 1364 1365 void oop_verify_on(oop obj, outputStream* st); 1366 1367 // Logging 1368 void print_class_load_logging(ClassLoaderData* loader_data, 1369 const ModuleEntry* module_entry, 1370 const ClassFileStream* cfs) const; 1371 }; 1372 1373 // for adding methods 1374 // UNSET_IDNUM return means no more ids available 1375 inline u2 InstanceKlass::next_method_idnum() { 1376 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1377 return ConstMethod::UNSET_IDNUM; // no more ids available 1378 } else { 1379 return _idnum_allocated_count++; 1380 } 1381 } 1382 1383 1384 /* JNIid class for jfieldIDs only */ 1385 class JNIid: public CHeapObj<mtClass> { 1386 friend class VMStructs; 1387 private: 1388 Klass* _holder; 1389 JNIid* _next; 1390 int _offset; 1391 #ifdef ASSERT 1392 bool _is_static_field_id; 1393 #endif 1394 1395 public: 1396 // Accessors 1397 Klass* holder() const { return _holder; } 1398 int offset() const { return _offset; } 1399 JNIid* next() { return _next; } 1400 // Constructor 1401 JNIid(Klass* holder, int offset, JNIid* next); 1402 // Identifier lookup 1403 JNIid* find(int offset); 1404 1405 bool find_local_field(fieldDescriptor* fd) { 1406 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1407 } 1408 1409 static void deallocate(JNIid* id); 1410 // Debugging 1411 #ifdef ASSERT 1412 bool is_static_field_id() const { return _is_static_field_id; } 1413 void set_is_static_field_id() { _is_static_field_id = true; } 1414 #endif 1415 void verify(Klass* holder); 1416 }; 1417 1418 // An iterator that's used to access the inner classes indices in the 1419 // InstanceKlass::_inner_classes array. 1420 class InnerClassesIterator : public StackObj { 1421 private: 1422 Array<jushort>* _inner_classes; 1423 int _length; 1424 int _idx; 1425 public: 1426 1427 InnerClassesIterator(const InstanceKlass* k) { 1428 _inner_classes = k->inner_classes(); 1429 if (k->inner_classes() != NULL) { 1430 _length = _inner_classes->length(); 1431 // The inner class array's length should be the multiple of 1432 // inner_class_next_offset if it only contains the InnerClasses 1433 // attribute data, or it should be 1434 // n*inner_class_next_offset+enclosing_method_attribute_size 1435 // if it also contains the EnclosingMethod data. 1436 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1437 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1438 "just checking"); 1439 // Remove the enclosing_method portion if exists. 1440 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1441 _length -= InstanceKlass::enclosing_method_attribute_size; 1442 } 1443 } else { 1444 _length = 0; 1445 } 1446 _idx = 0; 1447 } 1448 1449 int length() const { 1450 return _length; 1451 } 1452 1453 void next() { 1454 _idx += InstanceKlass::inner_class_next_offset; 1455 } 1456 1457 bool done() const { 1458 return (_idx >= _length); 1459 } 1460 1461 u2 inner_class_info_index() const { 1462 return _inner_classes->at( 1463 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1464 } 1465 1466 void set_inner_class_info_index(u2 index) { 1467 _inner_classes->at_put( 1468 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1469 } 1470 1471 u2 outer_class_info_index() const { 1472 return _inner_classes->at( 1473 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1474 } 1475 1476 void set_outer_class_info_index(u2 index) { 1477 _inner_classes->at_put( 1478 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1479 } 1480 1481 u2 inner_name_index() const { 1482 return _inner_classes->at( 1483 _idx + InstanceKlass::inner_class_inner_name_offset); 1484 } 1485 1486 void set_inner_name_index(u2 index) { 1487 _inner_classes->at_put( 1488 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1489 } 1490 1491 u2 inner_access_flags() const { 1492 return _inner_classes->at( 1493 _idx + InstanceKlass::inner_class_access_flags_offset); 1494 } 1495 }; 1496 1497 #endif // SHARE_OOPS_INSTANCEKLASS_HPP