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 nested. 199 // By always being set it makes nest-member access checks simpler. 200 InstanceKlass* _nest_host; 201 202 // The contents of the Record attribute. 203 Array<RecordComponent*>* _record_components; 204 205 // the source debug extension for this klass, NULL if not specified. 206 // Specified as UTF-8 string without terminating zero byte in the classfile, 207 // it is stored in the instanceklass as a NULL-terminated UTF-8 string 208 const char* _source_debug_extension; 209 // Array name derived from this class which needs unreferencing 210 // if this class is unloaded. 211 Symbol* _array_name; 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 // Constant pool index to the utf8 entry of the Generic signature, 218 // or 0 if none. 219 u2 _generic_signature_index; 220 // Constant pool index to the utf8 entry for the name of source file 221 // containing this klass, 0 if not specified. 222 u2 _source_file_name_index; 223 u2 _static_oop_field_count;// number of static oop fields in this klass 224 u2 _java_fields_count; // The number of declared Java fields 225 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 226 227 int _itable_len; // length of Java itable (in words) 228 // _is_marked_dependent can be set concurrently, thus cannot be part of the 229 // _misc_flags. 230 bool _is_marked_dependent; // used for marking during flushing and deoptimization 231 232 // The low two bits of _misc_flags contains the kind field. 233 // This can be used to quickly discriminate among the four kinds of 234 // InstanceKlass. 235 236 static const unsigned _misc_kind_field_size = 2; 237 static const unsigned _misc_kind_field_pos = 0; 238 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u; 239 240 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass 241 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass 242 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass 243 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass 244 245 // Start after _misc_kind field. 246 enum { 247 _misc_rewritten = 1 << 2, // methods rewritten. 248 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops 249 _misc_should_verify_class = 1 << 4, // allow caching of preverification 250 _misc_is_unsafe_anonymous = 1 << 5, // has embedded _unsafe_anonymous_host field 251 _misc_is_contended = 1 << 6, // marked with contended annotation 252 _misc_has_nonstatic_concrete_methods = 1 << 7, // class/superclass/implemented interfaces has non-static, concrete methods 253 _misc_declares_nonstatic_concrete_methods = 1 << 8, // directly declares non-static, concrete methods 254 _misc_has_been_redefined = 1 << 9, // class has been redefined 255 _misc_has_passed_fingerprint_check = 1 << 10, // when this class was loaded, the fingerprint computed from its 256 // code source was found to be matching the value recorded by AOT. 257 _misc_is_scratch_class = 1 << 11, // class is the redefined scratch class 258 _misc_is_shared_boot_class = 1 << 12, // defining class loader is boot class loader 259 _misc_is_shared_platform_class = 1 << 13, // defining class loader is platform class loader 260 _misc_is_shared_app_class = 1 << 14, // defining class loader is app class loader 261 _misc_has_resolved_methods = 1 << 15, // resolved methods table entries added for this class 262 _misc_is_being_redefined = 1 << 16, // used for locking redefinition 263 _misc_has_contended_annotations = 1 << 17 // has @Contended annotation 264 }; 265 u2 loader_type_bits() { 266 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class; 267 } 268 u4 _misc_flags; 269 u2 _minor_version; // minor version number of class file 270 u2 _major_version; // major version number of class file 271 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization) 272 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 273 JNIid* _jni_ids; // First JNI identifier for static fields in this class 274 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 275 nmethodBucket* volatile _dep_context; // packed DependencyContext structure 276 uint64_t volatile _dep_context_last_cleaned; 277 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 278 #if INCLUDE_JVMTI 279 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 280 // Linked instanceKlasses of previous versions 281 InstanceKlass* _previous_versions; 282 // JVMTI fields can be moved to their own structure - see 6315920 283 // JVMTI: cached class file, before retransformable agent modified it in CFLH 284 JvmtiCachedClassFileData* _cached_class_file; 285 #endif 286 287 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 288 289 // Class states are defined as ClassState (see above). 290 // Place the _init_state here to utilize the unused 2-byte after 291 // _idnum_allocated_count. 292 u1 _init_state; // state of class 293 u1 _reference_type; // reference type 294 295 u2 _this_class_index; // constant pool entry 296 #if INCLUDE_JVMTI 297 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 298 #endif 299 300 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 301 302 // Method array. 303 Array<Method*>* _methods; 304 // Default Method Array, concrete methods inherited from interfaces 305 Array<Method*>* _default_methods; 306 // Interfaces (InstanceKlass*s) this class declares locally to implement. 307 Array<InstanceKlass*>* _local_interfaces; 308 // Interfaces (InstanceKlass*s) this class implements transitively. 309 Array<InstanceKlass*>* _transitive_interfaces; 310 // Int array containing the original order of method in the class file (for JVMTI). 311 Array<int>* _method_ordering; 312 // Int array containing the vtable_indices for default_methods 313 // offset matches _default_methods offset 314 Array<int>* _default_vtable_indices; 315 316 // Instance and static variable information, starts with 6-tuples of shorts 317 // [access, name index, sig index, initval index, low_offset, high_offset] 318 // for all fields, followed by the generic signature data at the end of 319 // the array. Only fields with generic signature attributes have the generic 320 // signature data set in the array. The fields array looks like following: 321 // 322 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 323 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 324 // ... 325 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 326 // [generic signature index] 327 // [generic signature index] 328 // ... 329 Array<u2>* _fields; 330 331 // embedded Java vtable follows here 332 // embedded Java itables follows here 333 // embedded static fields follows here 334 // embedded nonstatic oop-map blocks follows here 335 // embedded implementor of this interface follows here 336 // The embedded implementor only exists if the current klass is an 337 // iterface. The possible values of the implementor fall into following 338 // three cases: 339 // NULL: no implementor. 340 // A Klass* that's not itself: one implementor. 341 // Itself: more than one implementors. 342 // embedded unsafe_anonymous_host klass follows here 343 // The embedded host klass only exists in an unsafe anonymous class for 344 // dynamic language support (JSR 292 enabled). The host class grants 345 // its access privileges to this class also. The host class is either 346 // named, or a previously loaded unsafe anonymous class. A non-anonymous class 347 // or an anonymous class loaded through normal classloading does not 348 // have this embedded field. 349 // 350 351 friend class SystemDictionary; 352 353 static bool _disable_method_binary_search; 354 355 public: 356 u2 loader_type() { 357 return _misc_flags & loader_type_bits(); 358 } 359 360 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 } 369 370 void clear_class_loader_type() { 371 _misc_flags &= ~loader_type_bits(); 372 } 373 374 void set_class_loader_type(s2 loader_type); 375 376 bool has_nonstatic_fields() const { 377 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 378 } 379 void set_has_nonstatic_fields(bool b) { 380 if (b) { 381 _misc_flags |= _misc_has_nonstatic_fields; 382 } else { 383 _misc_flags &= ~_misc_has_nonstatic_fields; 384 } 385 } 386 387 // field sizes 388 int nonstatic_field_size() const { return _nonstatic_field_size; } 389 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 390 391 int static_field_size() const { return _static_field_size; } 392 void set_static_field_size(int size) { _static_field_size = size; } 393 394 int static_oop_field_count() const { return (int)_static_oop_field_count; } 395 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 396 397 // Java itable 398 int itable_length() const { return _itable_len; } 399 void set_itable_length(int len) { _itable_len = len; } 400 401 // array klasses 402 Klass* array_klasses() const { return _array_klasses; } 403 inline Klass* array_klasses_acquire() const; // load with acquire semantics 404 void set_array_klasses(Klass* k) { _array_klasses = k; } 405 inline void release_set_array_klasses(Klass* k); // store with release semantics 406 407 // methods 408 Array<Method*>* methods() const { return _methods; } 409 void set_methods(Array<Method*>* a) { _methods = a; } 410 Method* method_with_idnum(int idnum); 411 Method* method_with_orig_idnum(int idnum); 412 Method* method_with_orig_idnum(int idnum, int version); 413 414 // method ordering 415 Array<int>* method_ordering() const { return _method_ordering; } 416 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 417 void copy_method_ordering(const intArray* m, TRAPS); 418 419 // default_methods 420 Array<Method*>* default_methods() const { return _default_methods; } 421 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 422 423 // default method vtable_indices 424 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 425 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 426 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 427 428 // interfaces 429 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; } 430 void set_local_interfaces(Array<InstanceKlass*>* a) { 431 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 432 _local_interfaces = a; } 433 434 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; } 435 void set_transitive_interfaces(Array<InstanceKlass*>* a) { 436 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 437 _transitive_interfaces = a; 438 } 439 440 private: 441 friend class fieldDescriptor; 442 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 443 444 public: 445 int field_offset (int index) const { return field(index)->offset(); } 446 int field_access_flags(int index) const { return field(index)->access_flags(); } 447 Symbol* field_name (int index) const { return field(index)->name(constants()); } 448 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 449 450 // Number of Java declared fields 451 int java_fields_count() const { return (int)_java_fields_count; } 452 453 Array<u2>* fields() const { return _fields; } 454 void set_fields(Array<u2>* f, u2 java_fields_count) { 455 guarantee(_fields == NULL || f == NULL, "Just checking"); 456 _fields = f; 457 _java_fields_count = java_fields_count; 458 } 459 460 // inner classes 461 Array<u2>* inner_classes() const { return _inner_classes; } 462 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 463 464 // nest members 465 Array<u2>* nest_members() const { return _nest_members; } 466 void set_nest_members(Array<u2>* m) { _nest_members = m; } 467 468 // nest-host index 469 jushort nest_host_index() const { return _nest_host_index; } 470 void set_nest_host_index(u2 i) { _nest_host_index = i; } 471 472 // record components 473 Array<RecordComponent*>* record_components() const { return _record_components; } 474 void set_record_components(Array<RecordComponent*>* record_components) { 475 _record_components = record_components; 476 } 477 bool is_record() const { return _record_components != NULL; } 478 479 private: 480 // Called to verify that k is a member of this nest - does not look at k's nest-host 481 bool has_nest_member(InstanceKlass* k, TRAPS) const; 482 483 public: 484 // Returns nest-host class, resolving and validating it if needed 485 // Returns NULL if an exception occurs during loading, or validation fails 486 InstanceKlass* nest_host(Symbol* validationException, TRAPS); 487 // Check if this klass is a nestmate of k - resolves this nest-host and k's 488 bool has_nestmate_access_to(InstanceKlass* k, TRAPS); 489 490 enum InnerClassAttributeOffset { 491 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 492 inner_class_inner_class_info_offset = 0, 493 inner_class_outer_class_info_offset = 1, 494 inner_class_inner_name_offset = 2, 495 inner_class_access_flags_offset = 3, 496 inner_class_next_offset = 4 497 }; 498 499 enum EnclosingMethodAttributeOffset { 500 enclosing_method_class_index_offset = 0, 501 enclosing_method_method_index_offset = 1, 502 enclosing_method_attribute_size = 2 503 }; 504 505 // method override check 506 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 507 508 // package 509 PackageEntry* package() const { return _package_entry; } 510 ModuleEntry* module() const; 511 bool in_unnamed_package() const { return (_package_entry == NULL); } 512 void set_package(PackageEntry* p) { _package_entry = p; } 513 void set_package(ClassLoaderData* loader_data, TRAPS); 514 bool is_same_class_package(const Klass* class2) const; 515 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const; 516 517 // find an enclosing class 518 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const; 519 520 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index. 521 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const; 522 523 private: 524 // Check prohibited package ("java/" only loadable by boot or platform loaders) 525 static void check_prohibited_package(Symbol* class_name, 526 ClassLoaderData* loader_data, 527 TRAPS); 528 public: 529 // initialization state 530 bool is_loaded() const { return _init_state >= loaded; } 531 bool is_linked() const { return _init_state >= linked; } 532 bool is_initialized() const { return _init_state == fully_initialized; } 533 bool is_not_initialized() const { return _init_state < being_initialized; } 534 bool is_being_initialized() const { return _init_state == being_initialized; } 535 bool is_in_error_state() const { return _init_state == initialization_error; } 536 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 537 ClassState init_state() { return (ClassState)_init_state; } 538 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 539 540 // defineClass specified verification 541 bool should_verify_class() const { 542 return (_misc_flags & _misc_should_verify_class) != 0; 543 } 544 void set_should_verify_class(bool value) { 545 if (value) { 546 _misc_flags |= _misc_should_verify_class; 547 } else { 548 _misc_flags &= ~_misc_should_verify_class; 549 } 550 } 551 552 // marking 553 bool is_marked_dependent() const { return _is_marked_dependent; } 554 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 555 556 // initialization (virtuals from Klass) 557 bool should_be_initialized() const; // means that initialize should be called 558 void initialize(TRAPS); 559 void link_class(TRAPS); 560 bool link_class_or_fail(TRAPS); // returns false on failure 561 void rewrite_class(TRAPS); 562 void link_methods(TRAPS); 563 Method* class_initializer() const; 564 565 // set the class to initialized if no static initializer is present 566 void eager_initialize(Thread *thread); 567 568 // reference type 569 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 570 void set_reference_type(ReferenceType t) { 571 assert(t == (u1)t, "overflow"); 572 _reference_type = (u1)t; 573 } 574 575 // this class cp index 576 u2 this_class_index() const { return _this_class_index; } 577 void set_this_class_index(u2 index) { _this_class_index = index; } 578 579 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 580 581 // find local field, returns true if found 582 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 583 // find field in direct superinterfaces, returns the interface in which the field is defined 584 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 585 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 586 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 587 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 588 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 589 590 // find a non-static or static field given its offset within the class. 591 bool contains_field_offset(int offset); 592 593 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 594 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 595 596 private: 597 inline static int quick_search(const Array<Method*>* methods, const Symbol* name); 598 599 public: 600 static void disable_method_binary_search() { 601 _disable_method_binary_search = true; 602 } 603 604 // find a local method (returns NULL if not found) 605 Method* find_method(const Symbol* name, const Symbol* signature) const; 606 static Method* find_method(const Array<Method*>* methods, 607 const Symbol* name, 608 const Symbol* signature); 609 610 // find a local method, but skip static methods 611 Method* find_instance_method(const Symbol* name, const Symbol* signature, 612 PrivateLookupMode private_mode = find_private) const; 613 static Method* find_instance_method(const Array<Method*>* methods, 614 const Symbol* name, 615 const Symbol* signature, 616 PrivateLookupMode private_mode = find_private); 617 618 // find a local method (returns NULL if not found) 619 Method* find_local_method(const Symbol* name, 620 const Symbol* signature, 621 OverpassLookupMode overpass_mode, 622 StaticLookupMode static_mode, 623 PrivateLookupMode private_mode) const; 624 625 // find a local method from given methods array (returns NULL if not found) 626 static Method* find_local_method(const Array<Method*>* methods, 627 const Symbol* name, 628 const Symbol* signature, 629 OverpassLookupMode overpass_mode, 630 StaticLookupMode static_mode, 631 PrivateLookupMode private_mode); 632 633 // find a local method index in methods or default_methods (returns -1 if not found) 634 static int find_method_index(const Array<Method*>* methods, 635 const Symbol* name, 636 const Symbol* signature, 637 OverpassLookupMode overpass_mode, 638 StaticLookupMode static_mode, 639 PrivateLookupMode private_mode); 640 641 // lookup operation (returns NULL if not found) 642 Method* uncached_lookup_method(const Symbol* name, 643 const Symbol* signature, 644 OverpassLookupMode overpass_mode, 645 PrivateLookupMode private_mode = find_private) const; 646 647 // lookup a method in all the interfaces that this class implements 648 // (returns NULL if not found) 649 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 650 651 // lookup a method in local defaults then in all interfaces 652 // (returns NULL if not found) 653 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 654 655 // Find method indices by name. If a method with the specified name is 656 // found the index to the first method is returned, and 'end' is filled in 657 // with the index of first non-name-matching method. If no method is found 658 // -1 is returned. 659 int find_method_by_name(const Symbol* name, int* end) const; 660 static int find_method_by_name(const Array<Method*>* methods, 661 const Symbol* name, int* end); 662 663 // constant pool 664 ConstantPool* constants() const { return _constants; } 665 void set_constants(ConstantPool* c) { _constants = c; } 666 667 // protection domain 668 oop protection_domain() const; 669 670 // signers 671 objArrayOop signers() const; 672 673 // host class 674 InstanceKlass* unsafe_anonymous_host() const { 675 InstanceKlass** hk = adr_unsafe_anonymous_host(); 676 if (hk == NULL) { 677 assert(!is_unsafe_anonymous(), "Unsafe anonymous classes have host klasses"); 678 return NULL; 679 } else { 680 assert(*hk != NULL, "host klass should always be set if the address is not null"); 681 assert(is_unsafe_anonymous(), "Only unsafe anonymous classes have host klasses"); 682 return *hk; 683 } 684 } 685 void set_unsafe_anonymous_host(const InstanceKlass* host) { 686 assert(is_unsafe_anonymous(), "not unsafe anonymous"); 687 const InstanceKlass** addr = (const InstanceKlass **)adr_unsafe_anonymous_host(); 688 assert(addr != NULL, "no reversed space"); 689 if (addr != NULL) { 690 *addr = host; 691 } 692 } 693 bool is_unsafe_anonymous() const { 694 return (_misc_flags & _misc_is_unsafe_anonymous) != 0; 695 } 696 void set_is_unsafe_anonymous(bool value) { 697 if (value) { 698 _misc_flags |= _misc_is_unsafe_anonymous; 699 } else { 700 _misc_flags &= ~_misc_is_unsafe_anonymous; 701 } 702 } 703 704 bool is_contended() const { 705 return (_misc_flags & _misc_is_contended) != 0; 706 } 707 void set_is_contended(bool value) { 708 if (value) { 709 _misc_flags |= _misc_is_contended; 710 } else { 711 _misc_flags &= ~_misc_is_contended; 712 } 713 } 714 715 // source file name 716 Symbol* source_file_name() const { 717 return (_source_file_name_index == 0) ? 718 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index); 719 } 720 u2 source_file_name_index() const { 721 return _source_file_name_index; 722 } 723 void set_source_file_name_index(u2 sourcefile_index) { 724 _source_file_name_index = sourcefile_index; 725 } 726 727 // minor and major version numbers of class file 728 u2 minor_version() const { return _minor_version; } 729 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 730 u2 major_version() const { return _major_version; } 731 void set_major_version(u2 major_version) { _major_version = major_version; } 732 733 // source debug extension 734 const char* source_debug_extension() const { return _source_debug_extension; } 735 void set_source_debug_extension(const char* array, int length); 736 737 // symbol unloading support (refcount already added) 738 Symbol* array_name() { return _array_name; } 739 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; } 740 741 // nonstatic oop-map blocks 742 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 743 return oop_map_count * OopMapBlock::size_in_words(); 744 } 745 unsigned int nonstatic_oop_map_count() const { 746 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 747 } 748 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 749 void set_nonstatic_oop_map_size(int words) { 750 _nonstatic_oop_map_size = words; 751 } 752 753 bool has_contended_annotations() const { 754 return ((_misc_flags & _misc_has_contended_annotations) != 0); 755 } 756 void set_has_contended_annotations(bool value) { 757 if (value) { 758 _misc_flags |= _misc_has_contended_annotations; 759 } else { 760 _misc_flags &= ~_misc_has_contended_annotations; 761 } 762 } 763 764 #if INCLUDE_JVMTI 765 // Redefinition locking. Class can only be redefined by one thread at a time. 766 bool is_being_redefined() const { 767 return ((_misc_flags & _misc_is_being_redefined) != 0); 768 } 769 void set_is_being_redefined(bool value) { 770 if (value) { 771 _misc_flags |= _misc_is_being_redefined; 772 } else { 773 _misc_flags &= ~_misc_is_being_redefined; 774 } 775 } 776 777 // RedefineClasses() support for previous versions: 778 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 779 void purge_previous_version_list(); 780 781 InstanceKlass* previous_versions() const { return _previous_versions; } 782 #else 783 InstanceKlass* previous_versions() const { return NULL; } 784 #endif 785 786 InstanceKlass* get_klass_version(int version) { 787 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 788 if (ik->constants()->version() == version) { 789 return ik; 790 } 791 } 792 return NULL; 793 } 794 795 bool has_been_redefined() const { 796 return (_misc_flags & _misc_has_been_redefined) != 0; 797 } 798 void set_has_been_redefined() { 799 _misc_flags |= _misc_has_been_redefined; 800 } 801 802 bool has_passed_fingerprint_check() const { 803 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0; 804 } 805 void set_has_passed_fingerprint_check(bool b) { 806 if (b) { 807 _misc_flags |= _misc_has_passed_fingerprint_check; 808 } else { 809 _misc_flags &= ~_misc_has_passed_fingerprint_check; 810 } 811 } 812 bool supers_have_passed_fingerprint_checks(); 813 814 static bool should_store_fingerprint(bool is_unsafe_anonymous); 815 bool should_store_fingerprint() const { return should_store_fingerprint(is_unsafe_anonymous()); } 816 bool has_stored_fingerprint() const; 817 uint64_t get_stored_fingerprint() const; 818 void store_fingerprint(uint64_t fingerprint); 819 820 bool is_scratch_class() const { 821 return (_misc_flags & _misc_is_scratch_class) != 0; 822 } 823 824 void set_is_scratch_class() { 825 _misc_flags |= _misc_is_scratch_class; 826 } 827 828 bool has_resolved_methods() const { 829 return (_misc_flags & _misc_has_resolved_methods) != 0; 830 } 831 832 void set_has_resolved_methods() { 833 _misc_flags |= _misc_has_resolved_methods; 834 } 835 private: 836 837 void set_kind(unsigned kind) { 838 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind"); 839 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos; 840 unsigned flags = _misc_flags & ~fmask; 841 _misc_flags = (flags | (kind << _misc_kind_field_pos)); 842 } 843 844 bool is_kind(unsigned desired) const { 845 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask; 846 return kind == desired; 847 } 848 849 public: 850 851 // Other is anything that is not one of the more specialized kinds of InstanceKlass. 852 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); } 853 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); } 854 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); } 855 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); } 856 857 #if INCLUDE_JVMTI 858 859 void init_previous_versions() { 860 _previous_versions = NULL; 861 } 862 863 private: 864 static bool _has_previous_versions; 865 public: 866 static void purge_previous_versions(InstanceKlass* ik) { 867 if (ik->has_been_redefined()) { 868 ik->purge_previous_version_list(); 869 } 870 } 871 872 static bool has_previous_versions_and_reset(); 873 static bool has_previous_versions() { return _has_previous_versions; } 874 875 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 876 void set_cached_class_file(JvmtiCachedClassFileData *data) { 877 _cached_class_file = data; 878 } 879 JvmtiCachedClassFileData * get_cached_class_file(); 880 jint get_cached_class_file_len(); 881 unsigned char * get_cached_class_file_bytes(); 882 883 // JVMTI: Support for caching of field indices, types, and offsets 884 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 885 _jvmti_cached_class_field_map = descriptor; 886 } 887 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 888 return _jvmti_cached_class_field_map; 889 } 890 #else // INCLUDE_JVMTI 891 892 static void purge_previous_versions(InstanceKlass* ik) { return; }; 893 static bool has_previous_versions_and_reset() { return false; } 894 895 void set_cached_class_file(JvmtiCachedClassFileData *data) { 896 assert(data == NULL, "unexpected call with JVMTI disabled"); 897 } 898 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; } 899 900 #endif // INCLUDE_JVMTI 901 902 bool has_nonstatic_concrete_methods() const { 903 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0; 904 } 905 void set_has_nonstatic_concrete_methods(bool b) { 906 if (b) { 907 _misc_flags |= _misc_has_nonstatic_concrete_methods; 908 } else { 909 _misc_flags &= ~_misc_has_nonstatic_concrete_methods; 910 } 911 } 912 913 bool declares_nonstatic_concrete_methods() const { 914 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0; 915 } 916 void set_declares_nonstatic_concrete_methods(bool b) { 917 if (b) { 918 _misc_flags |= _misc_declares_nonstatic_concrete_methods; 919 } else { 920 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods; 921 } 922 } 923 924 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 925 inline u2 next_method_idnum(); 926 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 927 928 // generics support 929 Symbol* generic_signature() const { 930 return (_generic_signature_index == 0) ? 931 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index); 932 } 933 u2 generic_signature_index() const { 934 return _generic_signature_index; 935 } 936 void set_generic_signature_index(u2 sig_index) { 937 _generic_signature_index = sig_index; 938 } 939 940 u2 enclosing_method_data(int offset) const; 941 u2 enclosing_method_class_index() const { 942 return enclosing_method_data(enclosing_method_class_index_offset); 943 } 944 u2 enclosing_method_method_index() { 945 return enclosing_method_data(enclosing_method_method_index_offset); 946 } 947 void set_enclosing_method_indices(u2 class_index, 948 u2 method_index); 949 950 // jmethodID support 951 jmethodID get_jmethod_id(const methodHandle& method_h); 952 jmethodID get_jmethod_id_fetch_or_update(size_t idnum, 953 jmethodID new_id, jmethodID* new_jmeths, 954 jmethodID* to_dealloc_id_p, 955 jmethodID** to_dealloc_jmeths_p); 956 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 957 size_t *length_p, jmethodID* id_p); 958 void ensure_space_for_methodids(int start_offset = 0); 959 jmethodID jmethod_id_or_null(Method* method); 960 961 // annotations support 962 Annotations* annotations() const { return _annotations; } 963 void set_annotations(Annotations* anno) { _annotations = anno; } 964 965 AnnotationArray* class_annotations() const { 966 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 967 } 968 Array<AnnotationArray*>* fields_annotations() const { 969 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 970 } 971 AnnotationArray* class_type_annotations() const { 972 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 973 } 974 Array<AnnotationArray*>* fields_type_annotations() const { 975 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 976 } 977 // allocation 978 instanceOop allocate_instance(TRAPS); 979 980 // additional member function to return a handle 981 instanceHandle allocate_instance_handle(TRAPS); 982 983 objArrayOop allocate_objArray(int n, int length, TRAPS); 984 // Helper function 985 static instanceOop register_finalizer(instanceOop i, TRAPS); 986 987 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 988 // if not, throw either an Error or an Exception. 989 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 990 991 // initialization 992 void call_class_initializer(TRAPS); 993 void set_initialization_state_and_notify(ClassState state, TRAPS); 994 995 // OopMapCache support 996 OopMapCache* oop_map_cache() { return _oop_map_cache; } 997 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 998 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 999 1000 // JNI identifier support (for static fields - for jni performance) 1001 JNIid* jni_ids() { return _jni_ids; } 1002 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 1003 JNIid* jni_id_for(int offset); 1004 1005 // maintenance of deoptimization dependencies 1006 inline DependencyContext dependencies(); 1007 int mark_dependent_nmethods(KlassDepChange& changes); 1008 void add_dependent_nmethod(nmethod* nm); 1009 void remove_dependent_nmethod(nmethod* nm); 1010 void clean_dependency_context(); 1011 1012 // On-stack replacement support 1013 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 1014 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 1015 void add_osr_nmethod(nmethod* n); 1016 bool remove_osr_nmethod(nmethod* n); 1017 int mark_osr_nmethods(const Method* m); 1018 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 1019 1020 #if INCLUDE_JVMTI 1021 // Breakpoint support (see methods on Method* for details) 1022 BreakpointInfo* breakpoints() const { return _breakpoints; }; 1023 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 1024 #endif 1025 1026 // support for stub routines 1027 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 1028 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;) 1029 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 1030 1031 // subclass/subinterface checks 1032 bool implements_interface(Klass* k) const; 1033 bool is_same_or_direct_interface(Klass* k) const; 1034 1035 #ifdef ASSERT 1036 // check whether this class or one of its superclasses was redefined 1037 bool has_redefined_this_or_super() const; 1038 #endif 1039 1040 // Access to the implementor of an interface. 1041 Klass* implementor() const; 1042 void set_implementor(Klass* k); 1043 int nof_implementors() const; 1044 void add_implementor(Klass* k); // k is a new class that implements this interface 1045 void init_implementor(); // initialize 1046 1047 // link this class into the implementors list of every interface it implements 1048 void process_interfaces(Thread *thread); 1049 1050 // virtual operations from Klass 1051 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 1052 Array<InstanceKlass*>* transitive_interfaces); 1053 bool can_be_primary_super_slow() const; 1054 int oop_size(oop obj) const { return size_helper(); } 1055 // slow because it's a virtual call and used for verifying the layout_helper. 1056 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 1057 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 1058 1059 // Iterators 1060 void do_local_static_fields(FieldClosure* cl); 1061 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 1062 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 1063 1064 void methods_do(void f(Method* method)); 1065 void array_klasses_do(void f(Klass* k)); 1066 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 1067 1068 static InstanceKlass* cast(Klass* k) { 1069 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 1070 } 1071 1072 static const InstanceKlass* cast(const Klass* k) { 1073 assert(k != NULL, "k should not be null"); 1074 assert(k->is_instance_klass(), "cast to InstanceKlass"); 1075 return static_cast<const InstanceKlass*>(k); 1076 } 1077 1078 virtual InstanceKlass* java_super() const { 1079 return (super() == NULL) ? NULL : cast(super()); 1080 } 1081 1082 // Sizing (in words) 1083 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 1084 1085 static int size(int vtable_length, int itable_length, 1086 int nonstatic_oop_map_size, 1087 bool is_interface, bool is_unsafe_anonymous, bool has_stored_fingerprint) { 1088 return align_metadata_size(header_size() + 1089 vtable_length + 1090 itable_length + 1091 nonstatic_oop_map_size + 1092 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) + 1093 (is_unsafe_anonymous ? (int)sizeof(Klass*)/wordSize : 0) + 1094 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0)); 1095 } 1096 int size() const { return size(vtable_length(), 1097 itable_length(), 1098 nonstatic_oop_map_size(), 1099 is_interface(), 1100 is_unsafe_anonymous(), 1101 has_stored_fingerprint()); 1102 } 1103 1104 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); } 1105 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 1106 1107 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 1108 1109 oop static_field_base_raw() { return java_mirror(); } 1110 1111 OopMapBlock* start_of_nonstatic_oop_maps() const { 1112 return (OopMapBlock*)(start_of_itable() + itable_length()); 1113 } 1114 1115 Klass** end_of_nonstatic_oop_maps() const { 1116 return (Klass**)(start_of_nonstatic_oop_maps() + 1117 nonstatic_oop_map_count()); 1118 } 1119 1120 Klass* volatile* adr_implementor() const { 1121 if (is_interface()) { 1122 return (Klass* volatile*)end_of_nonstatic_oop_maps(); 1123 } else { 1124 return NULL; 1125 } 1126 }; 1127 1128 InstanceKlass** adr_unsafe_anonymous_host() const { 1129 if (is_unsafe_anonymous()) { 1130 InstanceKlass** adr_impl = (InstanceKlass**)adr_implementor(); 1131 if (adr_impl != NULL) { 1132 return adr_impl + 1; 1133 } else { 1134 return (InstanceKlass **)end_of_nonstatic_oop_maps(); 1135 } 1136 } else { 1137 return NULL; 1138 } 1139 } 1140 1141 address adr_fingerprint() const { 1142 if (has_stored_fingerprint()) { 1143 InstanceKlass** adr_host = adr_unsafe_anonymous_host(); 1144 if (adr_host != NULL) { 1145 return (address)(adr_host + 1); 1146 } 1147 1148 Klass* volatile* adr_impl = adr_implementor(); 1149 if (adr_impl != NULL) { 1150 return (address)(adr_impl + 1); 1151 } 1152 1153 return (address)end_of_nonstatic_oop_maps(); 1154 } else { 1155 return NULL; 1156 } 1157 } 1158 1159 // Use this to return the size of an instance in heap words: 1160 int size_helper() const { 1161 return layout_helper_to_size_helper(layout_helper()); 1162 } 1163 1164 // This bit is initialized in classFileParser.cpp. 1165 // It is false under any of the following conditions: 1166 // - the class is abstract (including any interface) 1167 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1168 // - the class size is larger than FastAllocateSizeLimit 1169 // - the class is java/lang/Class, which cannot be allocated directly 1170 bool can_be_fastpath_allocated() const { 1171 return !layout_helper_needs_slow_path(layout_helper()); 1172 } 1173 1174 // Java itable 1175 klassItable itable() const; // return klassItable wrapper 1176 Method* method_at_itable(Klass* holder, int index, TRAPS); 1177 1178 #if INCLUDE_JVMTI 1179 void adjust_default_methods(bool* trace_name_printed); 1180 #endif // INCLUDE_JVMTI 1181 1182 void clean_weak_instanceklass_links(); 1183 private: 1184 void clean_implementors_list(); 1185 void clean_method_data(); 1186 1187 public: 1188 // Explicit metaspace deallocation of fields 1189 // For RedefineClasses and class file parsing errors, we need to deallocate 1190 // instanceKlasses and the metadata they point to. 1191 void deallocate_contents(ClassLoaderData* loader_data); 1192 static void deallocate_methods(ClassLoaderData* loader_data, 1193 Array<Method*>* methods); 1194 void static deallocate_interfaces(ClassLoaderData* loader_data, 1195 const Klass* super_klass, 1196 Array<InstanceKlass*>* local_interfaces, 1197 Array<InstanceKlass*>* transitive_interfaces); 1198 void static deallocate_record_components(ClassLoaderData* loader_data, 1199 Array<RecordComponent*>* record_component); 1200 1201 // The constant pool is on stack if any of the methods are executing or 1202 // referenced by handles. 1203 bool on_stack() const { return _constants->on_stack(); } 1204 1205 // callbacks for actions during class unloading 1206 static void unload_class(InstanceKlass* ik); 1207 static void release_C_heap_structures(InstanceKlass* ik); 1208 1209 // Naming 1210 const char* signature_name() const; 1211 static Symbol* package_from_name(const Symbol* name, TRAPS); 1212 1213 // Oop fields (and metadata) iterators 1214 // 1215 // The InstanceKlass iterators also visits the Object's klass. 1216 1217 // Forward iteration 1218 public: 1219 // Iterate over all oop fields in the oop maps. 1220 template <typename T, class OopClosureType> 1221 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1222 1223 // Iterate over all oop fields and metadata. 1224 template <typename T, class OopClosureType> 1225 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 1226 1227 // Iterate over all oop fields in one oop map. 1228 template <typename T, class OopClosureType> 1229 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1230 1231 1232 // Reverse iteration 1233 // Iterate over all oop fields and metadata. 1234 template <typename T, class OopClosureType> 1235 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1236 1237 private: 1238 // Iterate over all oop fields in the oop maps. 1239 template <typename T, class OopClosureType> 1240 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1241 1242 // Iterate over all oop fields in one oop map. 1243 template <typename T, class OopClosureType> 1244 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1245 1246 1247 // Bounded range iteration 1248 public: 1249 // Iterate over all oop fields in the oop maps. 1250 template <typename T, class OopClosureType> 1251 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1252 1253 // Iterate over all oop fields and metadata. 1254 template <typename T, class OopClosureType> 1255 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1256 1257 private: 1258 // Iterate over all oop fields in one oop map. 1259 template <typename T, class OopClosureType> 1260 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1261 1262 1263 public: 1264 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1265 1266 public: 1267 void set_in_error_state() { 1268 assert(DumpSharedSpaces, "only call this when dumping archive"); 1269 _init_state = initialization_error; 1270 } 1271 bool check_sharing_error_state(); 1272 1273 private: 1274 // initialization state 1275 void set_init_state(ClassState state); 1276 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1277 void set_init_thread(Thread *thread) { _init_thread = thread; } 1278 1279 // The RedefineClasses() API can cause new method idnums to be needed 1280 // which will cause the caches to grow. Safety requires different 1281 // cache management logic if the caches can grow instead of just 1282 // going from NULL to non-NULL. 1283 bool idnum_can_increment() const { return has_been_redefined(); } 1284 inline jmethodID* methods_jmethod_ids_acquire() const; 1285 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1286 1287 // Lock during initialization 1288 public: 1289 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1290 // Must be one per class and it has to be a VM internal object so java code 1291 // cannot lock it (like the mirror). 1292 // It has to be an object not a Mutex because it's held through java calls. 1293 oop init_lock() const; 1294 private: 1295 void fence_and_clear_init_lock(); 1296 1297 bool link_class_impl (TRAPS); 1298 bool verify_code (TRAPS); 1299 void initialize_impl (TRAPS); 1300 void initialize_super_interfaces (TRAPS); 1301 void eager_initialize_impl (); 1302 /* jni_id_for_impl for jfieldID only */ 1303 JNIid* jni_id_for_impl (int offset); 1304 1305 // Returns the array class for the n'th dimension 1306 Klass* array_klass_impl(bool or_null, int n, TRAPS); 1307 1308 // Returns the array class with this class as element type 1309 Klass* array_klass_impl(bool or_null, TRAPS); 1310 1311 // find a local method (returns NULL if not found) 1312 Method* find_method_impl(const Symbol* name, 1313 const Symbol* signature, 1314 OverpassLookupMode overpass_mode, 1315 StaticLookupMode static_mode, 1316 PrivateLookupMode private_mode) const; 1317 1318 static Method* find_method_impl(const Array<Method*>* methods, 1319 const Symbol* name, 1320 const Symbol* signature, 1321 OverpassLookupMode overpass_mode, 1322 StaticLookupMode static_mode, 1323 PrivateLookupMode private_mode); 1324 1325 // Free CHeap allocated fields. 1326 void release_C_heap_structures(); 1327 1328 #if INCLUDE_JVMTI 1329 // RedefineClasses support 1330 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1331 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1332 #endif 1333 public: 1334 // CDS support - remove and restore oops from metadata. Oops are not shared. 1335 virtual void remove_unshareable_info(); 1336 virtual void remove_java_mirror(); 1337 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 1338 1339 // jvm support 1340 jint compute_modifier_flags(TRAPS) const; 1341 1342 public: 1343 // JVMTI support 1344 jint jvmti_class_status() const; 1345 1346 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 1347 1348 public: 1349 // Printing 1350 #ifndef PRODUCT 1351 void print_on(outputStream* st) const; 1352 #endif 1353 void print_value_on(outputStream* st) const; 1354 1355 void oop_print_value_on(oop obj, outputStream* st); 1356 1357 #ifndef PRODUCT 1358 void oop_print_on (oop obj, outputStream* st); 1359 1360 void print_dependent_nmethods(bool verbose = false); 1361 bool is_dependent_nmethod(nmethod* nm); 1362 bool verify_itable_index(int index); 1363 #endif 1364 1365 const char* internal_name() const; 1366 1367 // Verification 1368 void verify_on(outputStream* st); 1369 1370 void oop_verify_on(oop obj, outputStream* st); 1371 1372 // Logging 1373 void print_class_load_logging(ClassLoaderData* loader_data, 1374 const char* module_name, 1375 const ClassFileStream* cfs) const; 1376 }; 1377 1378 // for adding methods 1379 // UNSET_IDNUM return means no more ids available 1380 inline u2 InstanceKlass::next_method_idnum() { 1381 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1382 return ConstMethod::UNSET_IDNUM; // no more ids available 1383 } else { 1384 return _idnum_allocated_count++; 1385 } 1386 } 1387 1388 1389 /* JNIid class for jfieldIDs only */ 1390 class JNIid: public CHeapObj<mtClass> { 1391 friend class VMStructs; 1392 private: 1393 Klass* _holder; 1394 JNIid* _next; 1395 int _offset; 1396 #ifdef ASSERT 1397 bool _is_static_field_id; 1398 #endif 1399 1400 public: 1401 // Accessors 1402 Klass* holder() const { return _holder; } 1403 int offset() const { return _offset; } 1404 JNIid* next() { return _next; } 1405 // Constructor 1406 JNIid(Klass* holder, int offset, JNIid* next); 1407 // Identifier lookup 1408 JNIid* find(int offset); 1409 1410 bool find_local_field(fieldDescriptor* fd) { 1411 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1412 } 1413 1414 static void deallocate(JNIid* id); 1415 // Debugging 1416 #ifdef ASSERT 1417 bool is_static_field_id() const { return _is_static_field_id; } 1418 void set_is_static_field_id() { _is_static_field_id = true; } 1419 #endif 1420 void verify(Klass* holder); 1421 }; 1422 1423 // An iterator that's used to access the inner classes indices in the 1424 // InstanceKlass::_inner_classes array. 1425 class InnerClassesIterator : public StackObj { 1426 private: 1427 Array<jushort>* _inner_classes; 1428 int _length; 1429 int _idx; 1430 public: 1431 1432 InnerClassesIterator(const InstanceKlass* k) { 1433 _inner_classes = k->inner_classes(); 1434 if (k->inner_classes() != NULL) { 1435 _length = _inner_classes->length(); 1436 // The inner class array's length should be the multiple of 1437 // inner_class_next_offset if it only contains the InnerClasses 1438 // attribute data, or it should be 1439 // n*inner_class_next_offset+enclosing_method_attribute_size 1440 // if it also contains the EnclosingMethod data. 1441 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1442 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1443 "just checking"); 1444 // Remove the enclosing_method portion if exists. 1445 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1446 _length -= InstanceKlass::enclosing_method_attribute_size; 1447 } 1448 } else { 1449 _length = 0; 1450 } 1451 _idx = 0; 1452 } 1453 1454 int length() const { 1455 return _length; 1456 } 1457 1458 void next() { 1459 _idx += InstanceKlass::inner_class_next_offset; 1460 } 1461 1462 bool done() const { 1463 return (_idx >= _length); 1464 } 1465 1466 u2 inner_class_info_index() const { 1467 return _inner_classes->at( 1468 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1469 } 1470 1471 void set_inner_class_info_index(u2 index) { 1472 _inner_classes->at_put( 1473 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1474 } 1475 1476 u2 outer_class_info_index() const { 1477 return _inner_classes->at( 1478 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1479 } 1480 1481 void set_outer_class_info_index(u2 index) { 1482 _inner_classes->at_put( 1483 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1484 } 1485 1486 u2 inner_name_index() const { 1487 return _inner_classes->at( 1488 _idx + InstanceKlass::inner_class_inner_name_offset); 1489 } 1490 1491 void set_inner_name_index(u2 index) { 1492 _inner_classes->at_put( 1493 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1494 } 1495 1496 u2 inner_access_flags() const { 1497 return _inner_classes->at( 1498 _idx + InstanceKlass::inner_class_access_flags_offset); 1499 } 1500 }; 1501 1502 #endif // SHARE_OOPS_INSTANCEKLASS_HPP