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