1 /* 2 * Copyright (c) 1997, 2019, 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 "code/vmreg.hpp" 30 #include "memory/referenceType.hpp" 31 #include "oops/annotations.hpp" 32 #include "oops/constMethod.hpp" 33 #include "oops/fieldInfo.hpp" 34 #include "oops/instanceOop.hpp" 35 #include "oops/klassVtable.hpp" 36 #include "runtime/handles.hpp" 37 #include "runtime/os.hpp" 38 #include "utilities/accessFlags.hpp" 39 #include "utilities/align.hpp" 40 #include "utilities/macros.hpp" 41 #if INCLUDE_JFR 42 #include "jfr/support/jfrKlassExtension.hpp" 43 #endif 44 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 // [EMBEDDED ValueKlassFixedBlock] only if is a ValueKlass instance 58 59 60 // forward declaration for class -- see below for definition 61 #if INCLUDE_JVMTI 62 class BreakpointInfo; 63 #endif 64 class ClassFileParser; 65 class ClassFileStream; 66 class KlassDepChange; 67 class DependencyContext; 68 class fieldDescriptor; 69 class jniIdMapBase; 70 class JNIid; 71 class JvmtiCachedClassFieldMap; 72 class nmethodBucket; 73 class OopMapCache; 74 class BufferedValueTypeBlob; 75 class InterpreterOopMap; 76 class PackageEntry; 77 class ModuleEntry; 78 79 // This is used in iterators below. 80 class FieldClosure: public StackObj { 81 public: 82 virtual void do_field(fieldDescriptor* fd) = 0; 83 }; 84 85 #ifndef PRODUCT 86 // Print fields. 87 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. 88 class FieldPrinter: public FieldClosure { 89 oop _obj; 90 outputStream* _st; 91 public: 92 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} 93 void do_field(fieldDescriptor* fd); 94 }; 95 #endif // !PRODUCT 96 97 // Describes where oops are located in instances of this klass. 98 class OopMapBlock { 99 public: 100 // Byte offset of the first oop mapped by this block. 101 int offset() const { return _offset; } 102 void set_offset(int offset) { _offset = offset; } 103 104 // Number of oops in this block. 105 uint count() const { return _count; } 106 void set_count(uint count) { _count = count; } 107 108 void increment_count(int diff) { _count += diff; } 109 110 int offset_span() const { return _count * heapOopSize; } 111 112 int end_offset() const { 113 return offset() + offset_span(); 114 } 115 116 bool is_contiguous(int another_offset) const { 117 return another_offset == end_offset(); 118 } 119 120 // sizeof(OopMapBlock) in words. 121 static const int size_in_words() { 122 return align_up((int)sizeof(OopMapBlock), wordSize) >> 123 LogBytesPerWord; 124 } 125 126 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) { 127 return a->offset() - b->offset(); 128 } 129 130 private: 131 int _offset; 132 uint _count; 133 }; 134 135 struct JvmtiCachedClassFileData; 136 137 class SigEntry; 138 139 class ValueKlassFixedBlock { 140 Array<SigEntry>** _extended_sig; 141 Array<VMRegPair>** _return_regs; 142 address* _pack_handler; 143 address* _unpack_handler; 144 int* _default_value_offset; 145 Klass** _value_array_klass; 146 int _alignment; 147 int _first_field_offset; 148 int _exact_size_in_bytes; 149 150 friend class ValueKlass; 151 }; 152 153 class ValueTypes { 154 public: 155 u2 _class_info_index; 156 Symbol* _class_name; 157 }; 158 159 class InstanceKlass: public Klass { 160 friend class VMStructs; 161 friend class JVMCIVMStructs; 162 friend class ClassFileParser; 163 friend class CompileReplay; 164 165 public: 166 static const KlassID ID = InstanceKlassID; 167 168 protected: 169 InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id = ID); 170 171 public: 172 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } 173 174 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 175 // of the class loading & initialization procedure, and the use of the states. 176 enum ClassState { 177 allocated, // allocated (but not yet linked) 178 loaded, // loaded and inserted in class hierarchy (but not linked yet) 179 linked, // successfully linked/verified (but not initialized yet) 180 being_initialized, // currently running class initializer 181 fully_initialized, // initialized (successful final state) 182 initialization_error // error happened during initialization 183 }; 184 185 private: 186 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS); 187 188 protected: 189 // If you add a new field that points to any metaspace object, you 190 // must add this field to InstanceKlass::metaspace_pointers_do(). 191 192 // Annotations for this class 193 Annotations* _annotations; 194 // Package this class is defined in 195 PackageEntry* _package_entry; 196 // Array classes holding elements of this class. 197 Klass* volatile _array_klasses; 198 // Constant pool for this class. 199 ConstantPool* _constants; 200 // The InnerClasses attribute and EnclosingMethod attribute. The 201 // _inner_classes is an array of shorts. If the class has InnerClasses 202 // attribute, then the _inner_classes array begins with 4-tuples of shorts 203 // [inner_class_info_index, outer_class_info_index, 204 // inner_name_index, inner_class_access_flags] for the InnerClasses 205 // attribute. If the EnclosingMethod attribute exists, it occupies the 206 // last two shorts [class_index, method_index] of the array. If only 207 // the InnerClasses attribute exists, the _inner_classes array length is 208 // number_of_inner_classes * 4. If the class has both InnerClasses 209 // and EnclosingMethod attributes the _inner_classes array length is 210 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 211 Array<jushort>* _inner_classes; 212 213 // The NestMembers attribute. An array of shorts, where each is a 214 // class info index for the class that is a nest member. This data 215 // has not been validated. 216 Array<jushort>* _nest_members; 217 218 // The NestHost attribute. The class info index for the class 219 // that is the nest-host of this class. This data has not been validated. 220 jushort _nest_host_index; 221 222 // Resolved nest-host klass: either true nest-host or self if we are not nested. 223 // By always being set it makes nest-member access checks simpler. 224 InstanceKlass* _nest_host; 225 226 Array<ValueTypes>* _value_types; 227 228 // the source debug extension for this klass, NULL if not specified. 229 // Specified as UTF-8 string without terminating zero byte in the classfile, 230 // it is stored in the instanceklass as a NULL-terminated UTF-8 string 231 const char* _source_debug_extension; 232 // Array name derived from this class which needs unreferencing 233 // if this class is unloaded. 234 Symbol* _array_name; 235 236 // Number of heapOopSize words used by non-static fields in this klass 237 // (including inherited fields but after header_size()). 238 int _nonstatic_field_size; 239 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 240 // Constant pool index to the utf8 entry of the Generic signature, 241 // or 0 if none. 242 u2 _generic_signature_index; 243 // Constant pool index to the utf8 entry for the name of source file 244 // containing this klass, 0 if not specified. 245 u2 _source_file_name_index; 246 u2 _static_oop_field_count;// number of static oop fields in this klass 247 u2 _java_fields_count; // The number of declared Java fields 248 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 249 250 int _itable_len; // length of Java itable (in words) 251 // _is_marked_dependent can be set concurrently, thus cannot be part of the 252 // _misc_flags. 253 bool _is_marked_dependent; // used for marking during flushing and deoptimization 254 255 public: 256 enum { 257 _extra_is_being_redefined = 1 << 0, // used for locking redefinition 258 _extra_has_resolved_methods = 1 << 1, // resolved methods table entries added for this class 259 _extra_has_value_fields = 1 << 2, // has value fields and related embedded section is not empty 260 _extra_is_bufferable = 1 << 3 // value can be buffered out side of the Java heap 261 }; 262 263 protected: 264 u1 _extra_flags; 265 266 // The low three bits of _misc_flags contains the kind field. 267 // This can be used to quickly discriminate among the five kinds of 268 // InstanceKlass. 269 270 static const unsigned _misc_kind_field_size = 3; 271 static const unsigned _misc_kind_field_pos = 0; 272 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u; 273 274 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass 275 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass 276 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass 277 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass 278 static const unsigned _misc_kind_value_type = 4; // ValueKlass 279 280 // Start after _misc_kind field. 281 enum { 282 _misc_rewritten = 1 << 3, // methods rewritten. 283 _misc_has_nonstatic_fields = 1 << 4, // for sizing with UseCompressedOops 284 _misc_should_verify_class = 1 << 5, // allow caching of preverification 285 _misc_is_unsafe_anonymous = 1 << 6, // has embedded _unsafe_anonymous_host field 286 _misc_is_contended = 1 << 7, // marked with contended annotation 287 _misc_has_nonstatic_concrete_methods = 1 << 8, // class/superclass/implemented interfaces has non-static, concrete methods 288 _misc_declares_nonstatic_concrete_methods = 1 << 9, // directly declares non-static, concrete methods 289 _misc_has_been_redefined = 1 << 10, // class has been redefined 290 _misc_has_passed_fingerprint_check = 1 << 11, // when this class was loaded, the fingerprint computed from its 291 // code source was found to be matching the value recorded by AOT. 292 _misc_is_scratch_class = 1 << 12, // class is the redefined scratch class 293 _misc_is_shared_boot_class = 1 << 13, // defining class loader is boot class loader 294 _misc_is_shared_platform_class = 1 << 14, // defining class loader is platform class loader 295 _misc_is_shared_app_class = 1 << 15 // defining class loader is app class loader 296 // u2 _misc_flags full (see _extra_flags) 297 }; 298 u2 loader_type_bits() { 299 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class; 300 } 301 u2 _misc_flags; 302 u2 _minor_version; // minor version number of class file 303 u2 _major_version; // major version number of class file 304 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization) 305 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 306 JNIid* _jni_ids; // First JNI identifier for static fields in this class 307 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 308 nmethodBucket* volatile _dep_context; // packed DependencyContext structure 309 uint64_t volatile _dep_context_last_cleaned; 310 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 311 #if INCLUDE_JVMTI 312 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 313 // Linked instanceKlasses of previous versions 314 InstanceKlass* _previous_versions; 315 // JVMTI fields can be moved to their own structure - see 6315920 316 // JVMTI: cached class file, before retransformable agent modified it in CFLH 317 JvmtiCachedClassFileData* _cached_class_file; 318 #endif 319 320 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 321 322 // Class states are defined as ClassState (see above). 323 // Place the _init_state here to utilize the unused 2-byte after 324 // _idnum_allocated_count. 325 u1 _init_state; // state of class 326 u1 _reference_type; // reference type 327 328 u2 _this_class_index; // constant pool entry 329 #if INCLUDE_JVMTI 330 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 331 #endif 332 333 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 334 335 // Method array. 336 Array<Method*>* _methods; 337 // Default Method Array, concrete methods inherited from interfaces 338 Array<Method*>* _default_methods; 339 // Interfaces (InstanceKlass*s) this class declares locally to implement. 340 Array<InstanceKlass*>* _local_interfaces; 341 // Interfaces (InstanceKlass*s) this class implements transitively. 342 Array<InstanceKlass*>* _transitive_interfaces; 343 // Int array containing the original order of method in the class file (for JVMTI). 344 Array<int>* _method_ordering; 345 // Int array containing the vtable_indices for default_methods 346 // offset matches _default_methods offset 347 Array<int>* _default_vtable_indices; 348 349 // Instance and static variable information, starts with 6-tuples of shorts 350 // [access, name index, sig index, initval index, low_offset, high_offset] 351 // for all fields, followed by the generic signature data at the end of 352 // the array. Only fields with generic signature attributes have the generic 353 // signature data set in the array. The fields array looks like following: 354 // 355 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 356 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 357 // ... 358 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 359 // [generic signature index] 360 // [generic signature index] 361 // ... 362 Array<u2>* _fields; 363 364 const ValueKlassFixedBlock* _adr_valueklass_fixed_block; 365 366 // embedded Java vtable follows here 367 // embedded Java itables follows here 368 // embedded static fields follows here 369 // embedded nonstatic oop-map blocks follows here 370 // embedded implementor of this interface follows here 371 // The embedded implementor only exists if the current klass is an 372 // iterface. The possible values of the implementor fall into following 373 // three cases: 374 // NULL: no implementor. 375 // A Klass* that's not itself: one implementor. 376 // Itself: more than one implementors. 377 // embedded unsafe_anonymous_host klass follows here 378 // The embedded host klass only exists in an unsafe anonymous class for 379 // dynamic language support (JSR 292 enabled). The host class grants 380 // its access privileges to this class also. The host class is either 381 // named, or a previously loaded unsafe anonymous class. A non-anonymous class 382 // or an anonymous class loaded through normal classloading does not 383 // have this embedded field. 384 // 385 386 friend class SystemDictionary; 387 388 public: 389 u2 loader_type() { 390 return _misc_flags & loader_type_bits(); 391 } 392 393 bool is_shared_boot_class() const { 394 return (_misc_flags & _misc_is_shared_boot_class) != 0; 395 } 396 bool is_shared_platform_class() const { 397 return (_misc_flags & _misc_is_shared_platform_class) != 0; 398 } 399 bool is_shared_app_class() const { 400 return (_misc_flags & _misc_is_shared_app_class) != 0; 401 } 402 403 void clear_class_loader_type() { 404 _misc_flags &= ~loader_type_bits(); 405 } 406 407 void set_class_loader_type(s2 loader_type); 408 409 bool has_nonstatic_fields() const { 410 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 411 } 412 void set_has_nonstatic_fields(bool b) { 413 if (b) { 414 _misc_flags |= _misc_has_nonstatic_fields; 415 } else { 416 _misc_flags &= ~_misc_has_nonstatic_fields; 417 } 418 } 419 420 bool has_value_fields() const { 421 return (_extra_flags & _extra_has_value_fields) != 0; 422 } 423 void set_has_value_fields() { 424 _extra_flags |= _extra_has_value_fields; 425 } 426 427 // field sizes 428 int nonstatic_field_size() const { return _nonstatic_field_size; } 429 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 430 431 int static_field_size() const { return _static_field_size; } 432 void set_static_field_size(int size) { _static_field_size = size; } 433 434 int static_oop_field_count() const { return (int)_static_oop_field_count; } 435 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 436 437 // Java itable 438 int itable_length() const { return _itable_len; } 439 void set_itable_length(int len) { _itable_len = len; } 440 441 // array klasses 442 Klass* array_klasses() const { return _array_klasses; } 443 inline Klass* array_klasses_acquire() const; // load with acquire semantics 444 void set_array_klasses(Klass* k) { _array_klasses = k; } 445 inline void release_set_array_klasses(Klass* k); // store with release semantics 446 447 // methods 448 Array<Method*>* methods() const { return _methods; } 449 void set_methods(Array<Method*>* a) { _methods = a; } 450 Method* method_with_idnum(int idnum); 451 Method* method_with_orig_idnum(int idnum); 452 Method* method_with_orig_idnum(int idnum, int version); 453 454 // method ordering 455 Array<int>* method_ordering() const { return _method_ordering; } 456 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 457 void copy_method_ordering(const intArray* m, TRAPS); 458 459 // default_methods 460 Array<Method*>* default_methods() const { return _default_methods; } 461 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 462 463 // default method vtable_indices 464 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 465 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 466 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 467 468 // interfaces 469 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; } 470 void set_local_interfaces(Array<InstanceKlass*>* a) { 471 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 472 _local_interfaces = a; } 473 474 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; } 475 void set_transitive_interfaces(Array<InstanceKlass*>* a) { 476 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 477 _transitive_interfaces = a; 478 } 479 480 private: 481 friend class fieldDescriptor; 482 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 483 484 public: 485 int field_offset (int index) const { return field(index)->offset(); } 486 int field_access_flags(int index) const { return field(index)->access_flags(); } 487 Symbol* field_name (int index) const { return field(index)->name(constants()); } 488 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 489 bool field_is_flattened(int index) const { return field(index)->is_flattened(); } 490 bool field_is_flattenable(int index) const { return field(index)->is_flattenable(); } 491 492 // Number of Java declared fields 493 int java_fields_count() const { return (int)_java_fields_count; } 494 495 Array<u2>* fields() const { return _fields; } 496 void set_fields(Array<u2>* f, u2 java_fields_count) { 497 guarantee(_fields == NULL || f == NULL, "Just checking"); 498 _fields = f; 499 _java_fields_count = java_fields_count; 500 } 501 502 // inner classes 503 Array<u2>* inner_classes() const { return _inner_classes; } 504 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 505 506 // nest members 507 Array<u2>* nest_members() const { return _nest_members; } 508 void set_nest_members(Array<u2>* m) { _nest_members = m; } 509 510 // nest-host index 511 jushort nest_host_index() const { return _nest_host_index; } 512 void set_nest_host_index(u2 i) { _nest_host_index = i; } 513 514 private: 515 // Called to verify that k is a member of this nest - does not look at k's nest-host 516 bool has_nest_member(InstanceKlass* k, TRAPS) const; 517 public: 518 // Returns nest-host class, resolving and validating it if needed 519 // Returns NULL if an exception occurs during loading, or validation fails 520 InstanceKlass* nest_host(Symbol* validationException, TRAPS); 521 // Check if this klass is a nestmate of k - resolves this nest-host and k's 522 bool has_nestmate_access_to(InstanceKlass* k, TRAPS); 523 524 enum InnerClassAttributeOffset { 525 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 526 inner_class_inner_class_info_offset = 0, 527 inner_class_outer_class_info_offset = 1, 528 inner_class_inner_name_offset = 2, 529 inner_class_access_flags_offset = 3, 530 inner_class_next_offset = 4 531 }; 532 533 enum EnclosingMethodAttributeOffset { 534 enclosing_method_class_index_offset = 0, 535 enclosing_method_method_index_offset = 1, 536 enclosing_method_attribute_size = 2 537 }; 538 539 // method override check 540 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 541 542 // package 543 PackageEntry* package() const { return _package_entry; } 544 ModuleEntry* module() const; 545 bool in_unnamed_package() const { return (_package_entry == NULL); } 546 void set_package(PackageEntry* p) { _package_entry = p; } 547 void set_package(ClassLoaderData* loader_data, TRAPS); 548 bool is_same_class_package(const Klass* class2) const; 549 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const; 550 551 // find an enclosing class 552 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const; 553 554 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index. 555 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const; 556 557 private: 558 // Check prohibited package ("java/" only loadable by boot or platform loaders) 559 static void check_prohibited_package(Symbol* class_name, 560 ClassLoaderData* loader_data, 561 TRAPS); 562 public: 563 // initialization state 564 bool is_loaded() const { return _init_state >= loaded; } 565 bool is_linked() const { return _init_state >= linked; } 566 bool is_initialized() const { return _init_state == fully_initialized; } 567 bool is_not_initialized() const { return _init_state < being_initialized; } 568 bool is_being_initialized() const { return _init_state == being_initialized; } 569 bool is_in_error_state() const { return _init_state == initialization_error; } 570 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 571 ClassState init_state() { return (ClassState)_init_state; } 572 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 573 574 // defineClass specified verification 575 bool should_verify_class() const { 576 return (_misc_flags & _misc_should_verify_class) != 0; 577 } 578 void set_should_verify_class(bool value) { 579 if (value) { 580 _misc_flags |= _misc_should_verify_class; 581 } else { 582 _misc_flags &= ~_misc_should_verify_class; 583 } 584 } 585 586 // marking 587 bool is_marked_dependent() const { return _is_marked_dependent; } 588 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 589 590 static ByteSize extra_flags_offset() { return in_ByteSize(offset_of(InstanceKlass, _extra_flags)); } 591 592 // initialization (virtuals from Klass) 593 bool should_be_initialized() const; // means that initialize should be called 594 void initialize(TRAPS); 595 void link_class(TRAPS); 596 bool link_class_or_fail(TRAPS); // returns false on failure 597 void rewrite_class(TRAPS); 598 void link_methods(TRAPS); 599 Method* class_initializer() const; 600 601 // set the class to initialized if no static initializer is present 602 void eager_initialize(Thread *thread); 603 604 // reference type 605 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 606 void set_reference_type(ReferenceType t) { 607 assert(t == (u1)t, "overflow"); 608 _reference_type = (u1)t; 609 } 610 611 // this class cp index 612 u2 this_class_index() const { return _this_class_index; } 613 void set_this_class_index(u2 index) { _this_class_index = index; } 614 615 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 616 617 // find local field, returns true if found 618 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 619 // find field in direct superinterfaces, returns the interface in which the field is defined 620 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 621 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 622 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 623 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 624 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 625 626 // find a non-static or static field given its offset within the class. 627 bool contains_field_offset(int offset) { 628 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size(), is_value()); 629 } 630 631 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 632 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 633 634 // find a local method (returns NULL if not found) 635 Method* find_method(const Symbol* name, const Symbol* signature) const; 636 static Method* find_method(const Array<Method*>* methods, 637 const Symbol* name, 638 const Symbol* signature); 639 640 // find a local method, but skip static methods 641 Method* find_instance_method(const Symbol* name, const Symbol* signature, 642 PrivateLookupMode private_mode = find_private) const; 643 static Method* find_instance_method(const Array<Method*>* methods, 644 const Symbol* name, 645 const Symbol* signature, 646 PrivateLookupMode private_mode = find_private); 647 648 // find a local method (returns NULL if not found) 649 Method* find_local_method(const Symbol* name, 650 const Symbol* signature, 651 OverpassLookupMode overpass_mode, 652 StaticLookupMode static_mode, 653 PrivateLookupMode private_mode) const; 654 655 // find a local method from given methods array (returns NULL if not found) 656 static Method* find_local_method(const Array<Method*>* methods, 657 const Symbol* name, 658 const Symbol* signature, 659 OverpassLookupMode overpass_mode, 660 StaticLookupMode static_mode, 661 PrivateLookupMode private_mode); 662 663 // find a local method index in methods or default_methods (returns -1 if not found) 664 static int find_method_index(const Array<Method*>* methods, 665 const Symbol* name, 666 const Symbol* signature, 667 OverpassLookupMode overpass_mode, 668 StaticLookupMode static_mode, 669 PrivateLookupMode private_mode); 670 671 // lookup operation (returns NULL if not found) 672 Method* uncached_lookup_method(const Symbol* name, 673 const Symbol* signature, 674 OverpassLookupMode overpass_mode, 675 PrivateLookupMode private_mode = find_private) const; 676 677 // lookup a method in all the interfaces that this class implements 678 // (returns NULL if not found) 679 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 680 681 // lookup a method in local defaults then in all interfaces 682 // (returns NULL if not found) 683 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 684 685 // Find method indices by name. If a method with the specified name is 686 // found the index to the first method is returned, and 'end' is filled in 687 // with the index of first non-name-matching method. If no method is found 688 // -1 is returned. 689 int find_method_by_name(const Symbol* name, int* end) const; 690 static int find_method_by_name(const Array<Method*>* methods, 691 const Symbol* name, int* end); 692 693 // constant pool 694 ConstantPool* constants() const { return _constants; } 695 void set_constants(ConstantPool* c) { _constants = c; } 696 697 // protection domain 698 oop protection_domain() const; 699 700 // signers 701 objArrayOop signers() const; 702 703 // host class 704 InstanceKlass* unsafe_anonymous_host() const { 705 InstanceKlass** hk = adr_unsafe_anonymous_host(); 706 if (hk == NULL) { 707 assert(!is_unsafe_anonymous(), "Unsafe anonymous classes have host klasses"); 708 return NULL; 709 } else { 710 assert(*hk != NULL, "host klass should always be set if the address is not null"); 711 assert(is_unsafe_anonymous(), "Only unsafe anonymous classes have host klasses"); 712 return *hk; 713 } 714 } 715 void set_unsafe_anonymous_host(const InstanceKlass* host) { 716 assert(is_unsafe_anonymous(), "not unsafe anonymous"); 717 const InstanceKlass** addr = (const InstanceKlass **)adr_unsafe_anonymous_host(); 718 assert(addr != NULL, "no reversed space"); 719 if (addr != NULL) { 720 *addr = host; 721 } 722 } 723 bool is_unsafe_anonymous() const { 724 return (_misc_flags & _misc_is_unsafe_anonymous) != 0; 725 } 726 void set_is_unsafe_anonymous(bool value) { 727 if (value) { 728 _misc_flags |= _misc_is_unsafe_anonymous; 729 } else { 730 _misc_flags &= ~_misc_is_unsafe_anonymous; 731 } 732 } 733 734 bool is_contended() const { 735 return (_misc_flags & _misc_is_contended) != 0; 736 } 737 void set_is_contended(bool value) { 738 if (value) { 739 _misc_flags |= _misc_is_contended; 740 } else { 741 _misc_flags &= ~_misc_is_contended; 742 } 743 } 744 745 // source file name 746 Symbol* source_file_name() const { 747 return (_source_file_name_index == 0) ? 748 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index); 749 } 750 u2 source_file_name_index() const { 751 return _source_file_name_index; 752 } 753 void set_source_file_name_index(u2 sourcefile_index) { 754 _source_file_name_index = sourcefile_index; 755 } 756 757 // minor and major version numbers of class file 758 u2 minor_version() const { return _minor_version; } 759 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 760 u2 major_version() const { return _major_version; } 761 void set_major_version(u2 major_version) { _major_version = major_version; } 762 763 // source debug extension 764 const char* source_debug_extension() const { return _source_debug_extension; } 765 void set_source_debug_extension(const char* array, int length); 766 767 // symbol unloading support (refcount already added) 768 Symbol* array_name() { return _array_name; } 769 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; } 770 771 // nonstatic oop-map blocks 772 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 773 return oop_map_count * OopMapBlock::size_in_words(); 774 } 775 unsigned int nonstatic_oop_map_count() const { 776 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 777 } 778 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 779 void set_nonstatic_oop_map_size(int words) { 780 _nonstatic_oop_map_size = words; 781 } 782 783 #if INCLUDE_JVMTI 784 // Redefinition locking. Class can only be redefined by one thread at a time. 785 bool is_being_redefined() const { 786 return (_extra_flags & _extra_is_being_redefined); 787 } 788 void set_is_being_redefined(bool value) { 789 if (value) { 790 _extra_flags |= _extra_is_being_redefined; 791 } else { 792 _extra_flags &= ~_extra_is_being_redefined; 793 } 794 } 795 796 // RedefineClasses() support for previous versions: 797 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 798 void purge_previous_version_list(); 799 800 InstanceKlass* previous_versions() const { return _previous_versions; } 801 #else 802 InstanceKlass* previous_versions() const { return NULL; } 803 #endif 804 805 InstanceKlass* get_klass_version(int version) { 806 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 807 if (ik->constants()->version() == version) { 808 return ik; 809 } 810 } 811 return NULL; 812 } 813 814 bool has_been_redefined() const { 815 return (_misc_flags & _misc_has_been_redefined) != 0; 816 } 817 void set_has_been_redefined() { 818 _misc_flags |= _misc_has_been_redefined; 819 } 820 821 bool has_passed_fingerprint_check() const { 822 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0; 823 } 824 void set_has_passed_fingerprint_check(bool b) { 825 if (b) { 826 _misc_flags |= _misc_has_passed_fingerprint_check; 827 } else { 828 _misc_flags &= ~_misc_has_passed_fingerprint_check; 829 } 830 } 831 bool supers_have_passed_fingerprint_checks(); 832 833 static bool should_store_fingerprint(bool is_unsafe_anonymous); 834 bool should_store_fingerprint() const { return should_store_fingerprint(is_unsafe_anonymous()); } 835 bool has_stored_fingerprint() const; 836 uint64_t get_stored_fingerprint() const; 837 void store_fingerprint(uint64_t fingerprint); 838 839 bool is_scratch_class() const { 840 return (_misc_flags & _misc_is_scratch_class) != 0; 841 } 842 843 void set_is_scratch_class() { 844 _misc_flags |= _misc_is_scratch_class; 845 } 846 847 bool has_resolved_methods() const { 848 return (_extra_flags & _extra_has_resolved_methods) != 0; 849 } 850 851 void set_has_resolved_methods() { 852 _extra_flags |= _extra_has_resolved_methods; 853 } 854 private: 855 856 void set_kind(unsigned kind) { 857 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind"); 858 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos; 859 unsigned flags = _misc_flags & ~fmask; 860 _misc_flags = (flags | (kind << _misc_kind_field_pos)); 861 } 862 863 bool is_kind(unsigned desired) const { 864 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask; 865 return kind == desired; 866 } 867 868 public: 869 870 // Other is anything that is not one of the more specialized kinds of InstanceKlass. 871 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); } 872 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); } 873 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); } 874 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); } 875 bool is_value_type_klass() const { return is_kind(_misc_kind_value_type); } 876 877 #if INCLUDE_JVMTI 878 879 void init_previous_versions() { 880 _previous_versions = NULL; 881 } 882 883 private: 884 static bool _has_previous_versions; 885 public: 886 static void purge_previous_versions(InstanceKlass* ik) { 887 if (ik->has_been_redefined()) { 888 ik->purge_previous_version_list(); 889 } 890 } 891 892 static bool has_previous_versions_and_reset(); 893 static bool has_previous_versions() { return _has_previous_versions; } 894 895 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 896 void set_cached_class_file(JvmtiCachedClassFileData *data) { 897 _cached_class_file = data; 898 } 899 JvmtiCachedClassFileData * get_cached_class_file(); 900 jint get_cached_class_file_len(); 901 unsigned char * get_cached_class_file_bytes(); 902 903 // JVMTI: Support for caching of field indices, types, and offsets 904 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 905 _jvmti_cached_class_field_map = descriptor; 906 } 907 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 908 return _jvmti_cached_class_field_map; 909 } 910 #else // INCLUDE_JVMTI 911 912 static void purge_previous_versions(InstanceKlass* ik) { return; }; 913 static bool has_previous_versions_and_reset() { return false; } 914 915 void set_cached_class_file(JvmtiCachedClassFileData *data) { 916 assert(data == NULL, "unexpected call with JVMTI disabled"); 917 } 918 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; } 919 920 #endif // INCLUDE_JVMTI 921 922 bool has_nonstatic_concrete_methods() const { 923 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0; 924 } 925 void set_has_nonstatic_concrete_methods(bool b) { 926 if (b) { 927 _misc_flags |= _misc_has_nonstatic_concrete_methods; 928 } else { 929 _misc_flags &= ~_misc_has_nonstatic_concrete_methods; 930 } 931 } 932 933 bool declares_nonstatic_concrete_methods() const { 934 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0; 935 } 936 void set_declares_nonstatic_concrete_methods(bool b) { 937 if (b) { 938 _misc_flags |= _misc_declares_nonstatic_concrete_methods; 939 } else { 940 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods; 941 } 942 } 943 944 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 945 inline u2 next_method_idnum(); 946 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 947 948 // generics support 949 Symbol* generic_signature() const { 950 return (_generic_signature_index == 0) ? 951 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index); 952 } 953 u2 generic_signature_index() const { 954 return _generic_signature_index; 955 } 956 void set_generic_signature_index(u2 sig_index) { 957 _generic_signature_index = sig_index; 958 } 959 960 u2 enclosing_method_data(int offset) const; 961 u2 enclosing_method_class_index() const { 962 return enclosing_method_data(enclosing_method_class_index_offset); 963 } 964 u2 enclosing_method_method_index() { 965 return enclosing_method_data(enclosing_method_method_index_offset); 966 } 967 void set_enclosing_method_indices(u2 class_index, 968 u2 method_index); 969 970 // jmethodID support 971 jmethodID get_jmethod_id(const methodHandle& method_h); 972 jmethodID get_jmethod_id_fetch_or_update(size_t idnum, 973 jmethodID new_id, jmethodID* new_jmeths, 974 jmethodID* to_dealloc_id_p, 975 jmethodID** to_dealloc_jmeths_p); 976 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 977 size_t *length_p, jmethodID* id_p); 978 void ensure_space_for_methodids(int start_offset = 0); 979 jmethodID jmethod_id_or_null(Method* method); 980 981 // annotations support 982 Annotations* annotations() const { return _annotations; } 983 void set_annotations(Annotations* anno) { _annotations = anno; } 984 985 AnnotationArray* class_annotations() const { 986 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 987 } 988 Array<AnnotationArray*>* fields_annotations() const { 989 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 990 } 991 AnnotationArray* class_type_annotations() const { 992 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 993 } 994 Array<AnnotationArray*>* fields_type_annotations() const { 995 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 996 } 997 // allocation 998 instanceOop allocate_instance(TRAPS); 999 1000 // additional member function to return a handle 1001 instanceHandle allocate_instance_handle(TRAPS); 1002 1003 objArrayOop allocate_objArray(int n, int length, TRAPS); 1004 // Helper function 1005 static instanceOop register_finalizer(instanceOop i, TRAPS); 1006 1007 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 1008 // if not, throw either an Error or an Exception. 1009 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 1010 1011 // initialization 1012 void call_class_initializer(TRAPS); 1013 void set_initialization_state_and_notify(ClassState state, TRAPS); 1014 1015 // OopMapCache support 1016 OopMapCache* oop_map_cache() { return _oop_map_cache; } 1017 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 1018 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 1019 1020 // JNI identifier support (for static fields - for jni performance) 1021 JNIid* jni_ids() { return _jni_ids; } 1022 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 1023 JNIid* jni_id_for(int offset); 1024 1025 // maintenance of deoptimization dependencies 1026 inline DependencyContext dependencies(); 1027 int mark_dependent_nmethods(KlassDepChange& changes); 1028 void add_dependent_nmethod(nmethod* nm); 1029 void remove_dependent_nmethod(nmethod* nm); 1030 void clean_dependency_context(); 1031 1032 // On-stack replacement support 1033 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 1034 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 1035 void add_osr_nmethod(nmethod* n); 1036 bool remove_osr_nmethod(nmethod* n); 1037 int mark_osr_nmethods(const Method* m); 1038 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 1039 1040 #if INCLUDE_JVMTI 1041 // Breakpoint support (see methods on Method* for details) 1042 BreakpointInfo* breakpoints() const { return _breakpoints; }; 1043 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 1044 #endif 1045 1046 // support for stub routines 1047 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 1048 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;) 1049 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 1050 1051 static ByteSize adr_valueklass_fixed_block_offset() { return in_ByteSize(offset_of(InstanceKlass, _adr_valueklass_fixed_block)); } 1052 1053 // subclass/subinterface checks 1054 bool implements_interface(Klass* k) const; 1055 bool is_same_or_direct_interface(Klass* k) const; 1056 1057 #ifdef ASSERT 1058 // check whether this class or one of its superclasses was redefined 1059 bool has_redefined_this_or_super() const; 1060 #endif 1061 1062 // Access to the implementor of an interface. 1063 Klass* implementor() const; 1064 void set_implementor(Klass* k); 1065 int nof_implementors() const; 1066 void add_implementor(Klass* k); // k is a new class that implements this interface 1067 void init_implementor(); // initialize 1068 1069 // link this class into the implementors list of every interface it implements 1070 void process_interfaces(Thread *thread); 1071 1072 // virtual operations from Klass 1073 bool is_leaf_class() const { return _subklass == NULL; } 1074 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 1075 Array<InstanceKlass*>* transitive_interfaces); 1076 bool can_be_primary_super_slow() const; 1077 int oop_size(oop obj) const { return size_helper(); } 1078 // slow because it's a virtual call and used for verifying the layout_helper. 1079 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 1080 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 1081 1082 // Iterators 1083 void do_local_static_fields(FieldClosure* cl); 1084 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 1085 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 1086 1087 void methods_do(void f(Method* method)); 1088 virtual void array_klasses_do(void f(Klass* k)); 1089 1090 static InstanceKlass* cast(Klass* k) { 1091 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 1092 } 1093 1094 static const InstanceKlass* cast(const Klass* k) { 1095 assert(k != NULL, "k should not be null"); 1096 assert(k->is_instance_klass(), "cast to InstanceKlass"); 1097 return static_cast<const InstanceKlass*>(k); 1098 } 1099 1100 virtual InstanceKlass* java_super() const { 1101 return (super() == NULL) ? NULL : cast(super()); 1102 } 1103 1104 // Sizing (in words) 1105 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 1106 1107 static int size(int vtable_length, int itable_length, 1108 int nonstatic_oop_map_size, 1109 bool is_interface, bool is_unsafe_anonymous, bool has_stored_fingerprint, 1110 int java_fields, bool is_value_type) { 1111 return align_metadata_size(header_size() + 1112 vtable_length + 1113 itable_length + 1114 nonstatic_oop_map_size + 1115 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) + 1116 (is_unsafe_anonymous ? (int)sizeof(Klass*)/wordSize : 0) + 1117 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0) + 1118 (java_fields * (int)sizeof(Klass*)/wordSize) + 1119 (is_value_type ? (int)sizeof(ValueKlassFixedBlock) : 0)); 1120 } 1121 int size() const { return size(vtable_length(), 1122 itable_length(), 1123 nonstatic_oop_map_size(), 1124 is_interface(), 1125 is_unsafe_anonymous(), 1126 has_stored_fingerprint(), 1127 has_value_fields() ? java_fields_count() : 0, 1128 is_value()); 1129 } 1130 #if INCLUDE_SERVICES 1131 virtual void collect_statistics(KlassSizeStats *sz) const; 1132 #endif 1133 1134 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); } 1135 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 1136 1137 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 1138 1139 oop static_field_base_raw() { return java_mirror(); } 1140 1141 bool bounds_check(address addr, bool edge_ok = false, intptr_t size_in_bytes = -1) const PRODUCT_RETURN0; 1142 1143 OopMapBlock* start_of_nonstatic_oop_maps() const { 1144 return (OopMapBlock*)(start_of_itable() + itable_length()); 1145 } 1146 1147 Klass** end_of_nonstatic_oop_maps() const { 1148 return (Klass**)(start_of_nonstatic_oop_maps() + 1149 nonstatic_oop_map_count()); 1150 } 1151 1152 Klass* volatile* adr_implementor() const { 1153 if (is_interface()) { 1154 return (Klass* volatile*)end_of_nonstatic_oop_maps(); 1155 } else { 1156 return NULL; 1157 } 1158 }; 1159 1160 InstanceKlass** adr_unsafe_anonymous_host() const { 1161 if (is_unsafe_anonymous()) { 1162 InstanceKlass** adr_impl = (InstanceKlass**)adr_implementor(); 1163 if (adr_impl != NULL) { 1164 return adr_impl + 1; 1165 } else { 1166 return (InstanceKlass **)end_of_nonstatic_oop_maps(); 1167 } 1168 } else { 1169 return NULL; 1170 } 1171 } 1172 1173 address adr_fingerprint() const { 1174 if (has_stored_fingerprint()) { 1175 InstanceKlass** adr_host = adr_unsafe_anonymous_host(); 1176 if (adr_host != NULL) { 1177 return (address)(adr_host + 1); 1178 } 1179 1180 Klass* volatile* adr_impl = adr_implementor(); 1181 if (adr_impl != NULL) { 1182 return (address)(adr_impl + 1); 1183 } 1184 1185 return (address)end_of_nonstatic_oop_maps(); 1186 } else { 1187 return NULL; 1188 } 1189 } 1190 1191 address adr_value_fields_klasses() const { 1192 if (has_value_fields()) { 1193 address adr_fing = adr_fingerprint(); 1194 if (adr_fing != NULL) { 1195 return adr_fingerprint() + sizeof(u8); 1196 } 1197 1198 InstanceKlass** adr_host = adr_unsafe_anonymous_host(); 1199 if (adr_host != NULL) { 1200 return (address)(adr_host + 1); 1201 } 1202 1203 Klass* volatile* adr_impl = adr_implementor(); 1204 if (adr_impl != NULL) { 1205 return (address)(adr_impl + 1); 1206 } 1207 1208 return (address)end_of_nonstatic_oop_maps(); 1209 } else { 1210 return NULL; 1211 } 1212 } 1213 1214 Klass* get_value_field_klass(int idx) const { 1215 assert(has_value_fields(), "Sanity checking"); 1216 Klass* k = ((Klass**)adr_value_fields_klasses())[idx]; 1217 assert(k != NULL, "Should always be set before being read"); 1218 assert(k->is_value(), "Must be a value type"); 1219 return k; 1220 } 1221 1222 Klass* get_value_field_klass_or_null(int idx) const { 1223 assert(has_value_fields(), "Sanity checking"); 1224 Klass* k = ((Klass**)adr_value_fields_klasses())[idx]; 1225 assert(k == NULL || k->is_value(), "Must be a value type"); 1226 return k; 1227 } 1228 1229 void set_value_field_klass(int idx, Klass* k) { 1230 assert(has_value_fields(), "Sanity checking"); 1231 assert(k != NULL, "Should not be set to NULL"); 1232 assert(((Klass**)adr_value_fields_klasses())[idx] == NULL, "Should not be set twice"); 1233 ((Klass**)adr_value_fields_klasses())[idx] = k; 1234 } 1235 1236 // Use this to return the size of an instance in heap words: 1237 virtual int size_helper() const { 1238 return layout_helper_to_size_helper(layout_helper()); 1239 } 1240 1241 // This bit is initialized in classFileParser.cpp. 1242 // It is false under any of the following conditions: 1243 // - the class is abstract (including any interface) 1244 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1245 // - the class size is larger than FastAllocateSizeLimit 1246 // - the class is java/lang/Class, which cannot be allocated directly 1247 bool can_be_fastpath_allocated() const { 1248 return !layout_helper_needs_slow_path(layout_helper()); 1249 } 1250 1251 // Java itable 1252 klassItable itable() const; // return klassItable wrapper 1253 Method* method_at_itable(Klass* holder, int index, TRAPS); 1254 1255 #if INCLUDE_JVMTI 1256 void adjust_default_methods(bool* trace_name_printed); 1257 #endif // INCLUDE_JVMTI 1258 1259 void clean_weak_instanceklass_links(); 1260 private: 1261 void clean_implementors_list(); 1262 void clean_method_data(); 1263 1264 public: 1265 // Explicit metaspace deallocation of fields 1266 // For RedefineClasses and class file parsing errors, we need to deallocate 1267 // instanceKlasses and the metadata they point to. 1268 void deallocate_contents(ClassLoaderData* loader_data); 1269 static void deallocate_methods(ClassLoaderData* loader_data, 1270 Array<Method*>* methods); 1271 void static deallocate_interfaces(ClassLoaderData* loader_data, 1272 const Klass* super_klass, 1273 Array<InstanceKlass*>* local_interfaces, 1274 Array<InstanceKlass*>* transitive_interfaces); 1275 1276 // The constant pool is on stack if any of the methods are executing or 1277 // referenced by handles. 1278 bool on_stack() const { return _constants->on_stack(); } 1279 1280 // callbacks for actions during class unloading 1281 static void unload_class(InstanceKlass* ik); 1282 static void release_C_heap_structures(InstanceKlass* ik); 1283 1284 // Naming 1285 const char* signature_name() const; 1286 const char* signature_name_of(char c) const; 1287 static Symbol* package_from_name(const Symbol* name, TRAPS); 1288 1289 // Oop fields (and metadata) iterators 1290 // 1291 // The InstanceKlass iterators also visits the Object's klass. 1292 1293 // Forward iteration 1294 public: 1295 // Iterate over all oop fields in the oop maps. 1296 template <typename T, class OopClosureType> 1297 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1298 1299 // Iterate over all oop fields and metadata. 1300 template <typename T, class OopClosureType> 1301 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 1302 1303 // Iterate over all oop fields in one oop map. 1304 template <typename T, class OopClosureType> 1305 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1306 1307 1308 // Reverse iteration 1309 // Iterate over all oop fields and metadata. 1310 template <typename T, class OopClosureType> 1311 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1312 1313 private: 1314 // Iterate over all oop fields in the oop maps. 1315 template <typename T, class OopClosureType> 1316 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1317 1318 // Iterate over all oop fields in one oop map. 1319 template <typename T, class OopClosureType> 1320 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1321 1322 1323 // Bounded range iteration 1324 public: 1325 // Iterate over all oop fields in the oop maps. 1326 template <typename T, class OopClosureType> 1327 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1328 1329 // Iterate over all oop fields and metadata. 1330 template <typename T, class OopClosureType> 1331 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1332 1333 private: 1334 // Iterate over all oop fields in one oop map. 1335 template <typename T, class OopClosureType> 1336 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1337 1338 1339 public: 1340 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1341 1342 public: 1343 void set_in_error_state() { 1344 assert(DumpSharedSpaces, "only call this when dumping archive"); 1345 _init_state = initialization_error; 1346 } 1347 bool check_sharing_error_state(); 1348 1349 private: 1350 // initialization state 1351 void set_init_state(ClassState state); 1352 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1353 void set_init_thread(Thread *thread) { _init_thread = thread; } 1354 1355 // The RedefineClasses() API can cause new method idnums to be needed 1356 // which will cause the caches to grow. Safety requires different 1357 // cache management logic if the caches can grow instead of just 1358 // going from NULL to non-NULL. 1359 bool idnum_can_increment() const { return has_been_redefined(); } 1360 inline jmethodID* methods_jmethod_ids_acquire() const; 1361 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1362 1363 // Lock during initialization 1364 public: 1365 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1366 // Must be one per class and it has to be a VM internal object so java code 1367 // cannot lock it (like the mirror). 1368 // It has to be an object not a Mutex because it's held through java calls. 1369 oop init_lock() const; 1370 private: 1371 void fence_and_clear_init_lock(); 1372 1373 bool link_class_impl (TRAPS); 1374 bool verify_code (TRAPS); 1375 void initialize_impl (TRAPS); 1376 void initialize_super_interfaces (TRAPS); 1377 void eager_initialize_impl (); 1378 /* jni_id_for_impl for jfieldID only */ 1379 JNIid* jni_id_for_impl (int offset); 1380 protected: 1381 // Returns the array class for the n'th dimension 1382 virtual Klass* array_klass_impl(ArrayStorageProperties storage_props, bool or_null, int n, TRAPS); 1383 1384 // Returns the array class with this class as element type 1385 virtual Klass* array_klass_impl(ArrayStorageProperties storage_props, bool or_null, TRAPS); 1386 1387 private: 1388 1389 // find a local method (returns NULL if not found) 1390 Method* find_method_impl(const Symbol* name, 1391 const Symbol* signature, 1392 OverpassLookupMode overpass_mode, 1393 StaticLookupMode static_mode, 1394 PrivateLookupMode private_mode) const; 1395 1396 static Method* find_method_impl(const Array<Method*>* methods, 1397 const Symbol* name, 1398 const Symbol* signature, 1399 OverpassLookupMode overpass_mode, 1400 StaticLookupMode static_mode, 1401 PrivateLookupMode private_mode); 1402 1403 // Free CHeap allocated fields. 1404 void release_C_heap_structures(); 1405 1406 #if INCLUDE_JVMTI 1407 // RedefineClasses support 1408 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1409 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1410 #endif 1411 public: 1412 // CDS support - remove and restore oops from metadata. Oops are not shared. 1413 virtual void remove_unshareable_info(); 1414 virtual void remove_java_mirror(); 1415 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 1416 1417 // jvm support 1418 jint compute_modifier_flags(TRAPS) const; 1419 1420 public: 1421 // JVMTI support 1422 jint jvmti_class_status() const; 1423 1424 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 1425 1426 public: 1427 // Printing 1428 #ifndef PRODUCT 1429 void print_on(outputStream* st) const; 1430 #endif 1431 void print_value_on(outputStream* st) const; 1432 1433 void oop_print_value_on(oop obj, outputStream* st); 1434 1435 #ifndef PRODUCT 1436 void oop_print_on (oop obj, outputStream* st); 1437 1438 void print_dependent_nmethods(bool verbose = false); 1439 bool is_dependent_nmethod(nmethod* nm); 1440 bool verify_itable_index(int index); 1441 #endif 1442 1443 const char* internal_name() const; 1444 1445 // Verification 1446 void verify_on(outputStream* st); 1447 1448 void oop_verify_on(oop obj, outputStream* st); 1449 1450 // Logging 1451 void print_class_load_logging(ClassLoaderData* loader_data, 1452 const char* module_name, 1453 const ClassFileStream* cfs) const; 1454 }; 1455 1456 // for adding methods 1457 // UNSET_IDNUM return means no more ids available 1458 inline u2 InstanceKlass::next_method_idnum() { 1459 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1460 return ConstMethod::UNSET_IDNUM; // no more ids available 1461 } else { 1462 return _idnum_allocated_count++; 1463 } 1464 } 1465 1466 1467 /* JNIid class for jfieldIDs only */ 1468 class JNIid: public CHeapObj<mtClass> { 1469 friend class VMStructs; 1470 private: 1471 Klass* _holder; 1472 JNIid* _next; 1473 int _offset; 1474 #ifdef ASSERT 1475 bool _is_static_field_id; 1476 #endif 1477 1478 public: 1479 // Accessors 1480 Klass* holder() const { return _holder; } 1481 int offset() const { return _offset; } 1482 JNIid* next() { return _next; } 1483 // Constructor 1484 JNIid(Klass* holder, int offset, JNIid* next); 1485 // Identifier lookup 1486 JNIid* find(int offset); 1487 1488 bool find_local_field(fieldDescriptor* fd) { 1489 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1490 } 1491 1492 static void deallocate(JNIid* id); 1493 // Debugging 1494 #ifdef ASSERT 1495 bool is_static_field_id() const { return _is_static_field_id; } 1496 void set_is_static_field_id() { _is_static_field_id = true; } 1497 #endif 1498 void verify(Klass* holder); 1499 }; 1500 1501 // An iterator that's used to access the inner classes indices in the 1502 // InstanceKlass::_inner_classes array. 1503 class InnerClassesIterator : public StackObj { 1504 private: 1505 Array<jushort>* _inner_classes; 1506 int _length; 1507 int _idx; 1508 public: 1509 1510 InnerClassesIterator(const InstanceKlass* k) { 1511 _inner_classes = k->inner_classes(); 1512 if (k->inner_classes() != NULL) { 1513 _length = _inner_classes->length(); 1514 // The inner class array's length should be the multiple of 1515 // inner_class_next_offset if it only contains the InnerClasses 1516 // attribute data, or it should be 1517 // n*inner_class_next_offset+enclosing_method_attribute_size 1518 // if it also contains the EnclosingMethod data. 1519 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1520 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1521 "just checking"); 1522 // Remove the enclosing_method portion if exists. 1523 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1524 _length -= InstanceKlass::enclosing_method_attribute_size; 1525 } 1526 } else { 1527 _length = 0; 1528 } 1529 _idx = 0; 1530 } 1531 1532 int length() const { 1533 return _length; 1534 } 1535 1536 void next() { 1537 _idx += InstanceKlass::inner_class_next_offset; 1538 } 1539 1540 bool done() const { 1541 return (_idx >= _length); 1542 } 1543 1544 u2 inner_class_info_index() const { 1545 return _inner_classes->at( 1546 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1547 } 1548 1549 void set_inner_class_info_index(u2 index) { 1550 _inner_classes->at_put( 1551 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1552 } 1553 1554 u2 outer_class_info_index() const { 1555 return _inner_classes->at( 1556 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1557 } 1558 1559 void set_outer_class_info_index(u2 index) { 1560 _inner_classes->at_put( 1561 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1562 } 1563 1564 u2 inner_name_index() const { 1565 return _inner_classes->at( 1566 _idx + InstanceKlass::inner_class_inner_name_offset); 1567 } 1568 1569 void set_inner_name_index(u2 index) { 1570 _inner_classes->at_put( 1571 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1572 } 1573 1574 u2 inner_access_flags() const { 1575 return _inner_classes->at( 1576 _idx + InstanceKlass::inner_class_access_flags_offset); 1577 } 1578 }; 1579 1580 #endif // SHARE_OOPS_INSTANCEKLASS_HPP