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* _pack_handler_jobject; 144 address* _unpack_handler; 145 int* _default_value_offset; 146 Klass** _value_array_klass; 147 int _alignment; 148 int _first_field_offset; 149 int _exact_size_in_bytes; 150 151 friend class ValueKlass; 152 }; 153 154 class ValueTypes { 155 public: 156 u2 _class_info_index; 157 Symbol* _class_name; 158 }; 159 160 class InstanceKlass: public Klass { 161 friend class VMStructs; 162 friend class JVMCIVMStructs; 163 friend class ClassFileParser; 164 friend class CompileReplay; 165 166 public: 167 static const KlassID ID = InstanceKlassID; 168 169 protected: 170 InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id = ID); 171 172 public: 173 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } 174 175 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 176 // of the class loading & initialization procedure, and the use of the states. 177 enum ClassState { 178 allocated, // allocated (but not yet linked) 179 loaded, // loaded and inserted in class hierarchy (but not linked yet) 180 linked, // successfully linked/verified (but not initialized yet) 181 being_initialized, // currently running class initializer 182 fully_initialized, // initialized (successful final state) 183 initialization_error // error happened during initialization 184 }; 185 186 private: 187 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS); 188 189 protected: 190 // If you add a new field that points to any metaspace object, you 191 // must add this field to InstanceKlass::metaspace_pointers_do(). 192 193 // Annotations for this class 194 Annotations* _annotations; 195 // Package this class is defined in 196 PackageEntry* _package_entry; 197 // Array classes holding elements of this class. 198 Klass* volatile _array_klasses; 199 // Constant pool for this class. 200 ConstantPool* _constants; 201 // The InnerClasses attribute and EnclosingMethod attribute. The 202 // _inner_classes is an array of shorts. If the class has InnerClasses 203 // attribute, then the _inner_classes array begins with 4-tuples of shorts 204 // [inner_class_info_index, outer_class_info_index, 205 // inner_name_index, inner_class_access_flags] for the InnerClasses 206 // attribute. If the EnclosingMethod attribute exists, it occupies the 207 // last two shorts [class_index, method_index] of the array. If only 208 // the InnerClasses attribute exists, the _inner_classes array length is 209 // number_of_inner_classes * 4. If the class has both InnerClasses 210 // and EnclosingMethod attributes the _inner_classes array length is 211 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 212 Array<jushort>* _inner_classes; 213 214 // The NestMembers attribute. An array of shorts, where each is a 215 // class info index for the class that is a nest member. This data 216 // has not been validated. 217 Array<jushort>* _nest_members; 218 219 // The NestHost attribute. The class info index for the class 220 // that is the nest-host of this class. This data has not been validated. 221 jushort _nest_host_index; 222 223 // Resolved nest-host klass: either true nest-host or self if we are not nested. 224 // By always being set it makes nest-member access checks simpler. 225 InstanceKlass* _nest_host; 226 227 Array<ValueTypes>* _value_types; 228 229 // the source debug extension for this klass, NULL if not specified. 230 // Specified as UTF-8 string without terminating zero byte in the classfile, 231 // it is stored in the instanceklass as a NULL-terminated UTF-8 string 232 const char* _source_debug_extension; 233 // Array name derived from this class which needs unreferencing 234 // if this class is unloaded. 235 Symbol* _array_name; 236 237 // Number of heapOopSize words used by non-static fields in this klass 238 // (including inherited fields but after header_size()). 239 int _nonstatic_field_size; 240 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 241 // Constant pool index to the utf8 entry of the Generic signature, 242 // or 0 if none. 243 u2 _generic_signature_index; 244 // Constant pool index to the utf8 entry for the name of source file 245 // containing this klass, 0 if not specified. 246 u2 _source_file_name_index; 247 u2 _static_oop_field_count;// number of static oop fields in this klass 248 u2 _java_fields_count; // The number of declared Java fields 249 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 250 251 int _itable_len; // length of Java itable (in words) 252 // _is_marked_dependent can be set concurrently, thus cannot be part of the 253 // _misc_flags. 254 bool _is_marked_dependent; // used for marking during flushing and deoptimization 255 256 public: 257 enum { 258 _extra_is_being_redefined = 1 << 0, // used for locking redefinition 259 _extra_has_resolved_methods = 1 << 1, // resolved methods table entries added for this class 260 _extra_has_value_fields = 1 << 2, // has value fields and related embedded section is not empty 261 _extra_is_empty_value = 1 << 3 // empty value type 262 }; 263 264 protected: 265 u1 _extra_flags; 266 267 // The low three bits of _misc_flags contains the kind field. 268 // This can be used to quickly discriminate among the five kinds of 269 // InstanceKlass. 270 271 static const unsigned _misc_kind_field_size = 3; 272 static const unsigned _misc_kind_field_pos = 0; 273 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u; 274 275 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass 276 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass 277 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass 278 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass 279 static const unsigned _misc_kind_value_type = 4; // ValueKlass 280 281 // Start after _misc_kind field. 282 enum { 283 _misc_rewritten = 1 << 3, // methods rewritten. 284 _misc_has_nonstatic_fields = 1 << 4, // for sizing with UseCompressedOops 285 _misc_should_verify_class = 1 << 5, // allow caching of preverification 286 _misc_is_unsafe_anonymous = 1 << 6, // has embedded _unsafe_anonymous_host field 287 _misc_is_contended = 1 << 7, // marked with contended annotation 288 _misc_has_nonstatic_concrete_methods = 1 << 8, // class/superclass/implemented interfaces has non-static, concrete methods 289 _misc_declares_nonstatic_concrete_methods = 1 << 9, // directly declares non-static, concrete methods 290 _misc_has_been_redefined = 1 << 10, // class has been redefined 291 _misc_has_passed_fingerprint_check = 1 << 11, // when this class was loaded, the fingerprint computed from its 292 // code source was found to be matching the value recorded by AOT. 293 _misc_is_scratch_class = 1 << 12, // class is the redefined scratch class 294 _misc_is_shared_boot_class = 1 << 13, // defining class loader is boot class loader 295 _misc_is_shared_platform_class = 1 << 14, // defining class loader is platform class loader 296 _misc_is_shared_app_class = 1 << 15 // defining class loader is app class loader 297 // u2 _misc_flags full (see _extra_flags) 298 }; 299 u2 loader_type_bits() { 300 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class; 301 } 302 u2 _misc_flags; 303 u2 _minor_version; // minor version number of class file 304 u2 _major_version; // major version number of class file 305 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization) 306 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 307 JNIid* _jni_ids; // First JNI identifier for static fields in this class 308 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 309 nmethodBucket* volatile _dep_context; // packed DependencyContext structure 310 uint64_t volatile _dep_context_last_cleaned; 311 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 312 #if INCLUDE_JVMTI 313 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 314 // Linked instanceKlasses of previous versions 315 InstanceKlass* _previous_versions; 316 // JVMTI fields can be moved to their own structure - see 6315920 317 // JVMTI: cached class file, before retransformable agent modified it in CFLH 318 JvmtiCachedClassFileData* _cached_class_file; 319 #endif 320 321 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 322 323 // Class states are defined as ClassState (see above). 324 // Place the _init_state here to utilize the unused 2-byte after 325 // _idnum_allocated_count. 326 u1 _init_state; // state of class 327 u1 _reference_type; // reference type 328 329 u2 _this_class_index; // constant pool entry 330 #if INCLUDE_JVMTI 331 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 332 #endif 333 334 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 335 336 // Method array. 337 Array<Method*>* _methods; 338 // Default Method Array, concrete methods inherited from interfaces 339 Array<Method*>* _default_methods; 340 // Interfaces (InstanceKlass*s) this class declares locally to implement. 341 Array<InstanceKlass*>* _local_interfaces; 342 // Interfaces (InstanceKlass*s) this class implements transitively. 343 Array<InstanceKlass*>* _transitive_interfaces; 344 // Int array containing the original order of method in the class file (for JVMTI). 345 Array<int>* _method_ordering; 346 // Int array containing the vtable_indices for default_methods 347 // offset matches _default_methods offset 348 Array<int>* _default_vtable_indices; 349 350 // Instance and static variable information, starts with 6-tuples of shorts 351 // [access, name index, sig index, initval index, low_offset, high_offset] 352 // for all fields, followed by the generic signature data at the end of 353 // the array. Only fields with generic signature attributes have the generic 354 // signature data set in the array. The fields array looks like following: 355 // 356 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 357 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 358 // ... 359 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 360 // [generic signature index] 361 // [generic signature index] 362 // ... 363 Array<u2>* _fields; 364 const Klass** _value_field_klasses; // For "inline class" fields, NULL if none present 365 366 const ValueKlassFixedBlock* _adr_valueklass_fixed_block; 367 368 // embedded Java vtable follows here 369 // embedded Java itables follows here 370 // embedded static fields follows here 371 // embedded nonstatic oop-map blocks follows here 372 // embedded implementor of this interface follows here 373 // The embedded implementor only exists if the current klass is an 374 // iterface. The possible values of the implementor fall into following 375 // three cases: 376 // NULL: no implementor. 377 // A Klass* that's not itself: one implementor. 378 // Itself: more than one implementors. 379 // embedded unsafe_anonymous_host klass follows here 380 // The embedded host klass only exists in an unsafe anonymous class for 381 // dynamic language support (JSR 292 enabled). The host class grants 382 // its access privileges to this class also. The host class is either 383 // named, or a previously loaded unsafe anonymous class. A non-anonymous class 384 // or an anonymous class loaded through normal classloading does not 385 // have this embedded field. 386 // 387 388 friend class SystemDictionary; 389 390 static bool _disable_method_binary_search; 391 392 public: 393 u2 loader_type() { 394 return _misc_flags & loader_type_bits(); 395 } 396 397 bool is_shared_boot_class() const { 398 return (_misc_flags & _misc_is_shared_boot_class) != 0; 399 } 400 bool is_shared_platform_class() const { 401 return (_misc_flags & _misc_is_shared_platform_class) != 0; 402 } 403 bool is_shared_app_class() const { 404 return (_misc_flags & _misc_is_shared_app_class) != 0; 405 } 406 407 void clear_class_loader_type() { 408 _misc_flags &= ~loader_type_bits(); 409 } 410 411 void set_class_loader_type(s2 loader_type); 412 413 bool has_nonstatic_fields() const { 414 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 415 } 416 void set_has_nonstatic_fields(bool b) { 417 if (b) { 418 _misc_flags |= _misc_has_nonstatic_fields; 419 } else { 420 _misc_flags &= ~_misc_has_nonstatic_fields; 421 } 422 } 423 424 bool has_value_fields() const { 425 return (_extra_flags & _extra_has_value_fields) != 0; 426 } 427 void set_has_value_fields() { 428 _extra_flags |= _extra_has_value_fields; 429 } 430 431 bool is_empty_value() const { 432 return (_extra_flags & _extra_is_empty_value) != 0; 433 } 434 void set_is_empty_value() { 435 _extra_flags |= _extra_is_empty_value; 436 } 437 438 // field sizes 439 int nonstatic_field_size() const { return _nonstatic_field_size; } 440 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 441 442 int static_field_size() const { return _static_field_size; } 443 void set_static_field_size(int size) { _static_field_size = size; } 444 445 int static_oop_field_count() const { return (int)_static_oop_field_count; } 446 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 447 448 // Java itable 449 int itable_length() const { return _itable_len; } 450 void set_itable_length(int len) { _itable_len = len; } 451 452 // array klasses 453 Klass* array_klasses() const { return _array_klasses; } 454 inline Klass* array_klasses_acquire() const; // load with acquire semantics 455 void set_array_klasses(Klass* k) { _array_klasses = k; } 456 inline void release_set_array_klasses(Klass* k); // store with release semantics 457 458 // methods 459 Array<Method*>* methods() const { return _methods; } 460 void set_methods(Array<Method*>* a) { _methods = a; } 461 Method* method_with_idnum(int idnum); 462 Method* method_with_orig_idnum(int idnum); 463 Method* method_with_orig_idnum(int idnum, int version); 464 465 // method ordering 466 Array<int>* method_ordering() const { return _method_ordering; } 467 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 468 void copy_method_ordering(const intArray* m, TRAPS); 469 470 // default_methods 471 Array<Method*>* default_methods() const { return _default_methods; } 472 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 473 474 // default method vtable_indices 475 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 476 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 477 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 478 479 // interfaces 480 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; } 481 void set_local_interfaces(Array<InstanceKlass*>* a) { 482 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 483 _local_interfaces = a; } 484 485 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; } 486 void set_transitive_interfaces(Array<InstanceKlass*>* a) { 487 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 488 _transitive_interfaces = a; 489 } 490 491 private: 492 friend class fieldDescriptor; 493 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 494 495 public: 496 int field_offset (int index) const { return field(index)->offset(); } 497 int field_access_flags(int index) const { return field(index)->access_flags(); } 498 Symbol* field_name (int index) const { return field(index)->name(constants()); } 499 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 500 bool field_is_flattened(int index) const { return field(index)->is_flattened(); } 501 bool field_is_flattenable(int index) const { return field(index)->is_flattenable(); } 502 503 // Number of Java declared fields 504 int java_fields_count() const { return (int)_java_fields_count; } 505 506 Array<u2>* fields() const { return _fields; } 507 void set_fields(Array<u2>* f, u2 java_fields_count) { 508 guarantee(_fields == NULL || f == NULL, "Just checking"); 509 _fields = f; 510 _java_fields_count = java_fields_count; 511 } 512 513 // inner classes 514 Array<u2>* inner_classes() const { return _inner_classes; } 515 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 516 517 // nest members 518 Array<u2>* nest_members() const { return _nest_members; } 519 void set_nest_members(Array<u2>* m) { _nest_members = m; } 520 521 // nest-host index 522 jushort nest_host_index() const { return _nest_host_index; } 523 void set_nest_host_index(u2 i) { _nest_host_index = i; } 524 525 private: 526 // Called to verify that k is a member of this nest - does not look at k's nest-host 527 bool has_nest_member(InstanceKlass* k, TRAPS) const; 528 public: 529 // Returns nest-host class, resolving and validating it if needed 530 // Returns NULL if an exception occurs during loading, or validation fails 531 InstanceKlass* nest_host(Symbol* validationException, TRAPS); 532 // Check if this klass is a nestmate of k - resolves this nest-host and k's 533 bool has_nestmate_access_to(InstanceKlass* k, TRAPS); 534 535 enum InnerClassAttributeOffset { 536 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 537 inner_class_inner_class_info_offset = 0, 538 inner_class_outer_class_info_offset = 1, 539 inner_class_inner_name_offset = 2, 540 inner_class_access_flags_offset = 3, 541 inner_class_next_offset = 4 542 }; 543 544 enum EnclosingMethodAttributeOffset { 545 enclosing_method_class_index_offset = 0, 546 enclosing_method_method_index_offset = 1, 547 enclosing_method_attribute_size = 2 548 }; 549 550 // method override check 551 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 552 553 // package 554 PackageEntry* package() const { return _package_entry; } 555 ModuleEntry* module() const; 556 bool in_unnamed_package() const { return (_package_entry == NULL); } 557 void set_package(PackageEntry* p) { _package_entry = p; } 558 void set_package(ClassLoaderData* loader_data, TRAPS); 559 bool is_same_class_package(const Klass* class2) const; 560 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const; 561 562 // find an enclosing class 563 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const; 564 565 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index. 566 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const; 567 568 private: 569 // Check prohibited package ("java/" only loadable by boot or platform loaders) 570 static void check_prohibited_package(Symbol* class_name, 571 ClassLoaderData* loader_data, 572 TRAPS); 573 public: 574 // initialization state 575 bool is_loaded() const { return _init_state >= loaded; } 576 bool is_linked() const { return _init_state >= linked; } 577 bool is_initialized() const { return _init_state == fully_initialized; } 578 bool is_not_initialized() const { return _init_state < being_initialized; } 579 bool is_being_initialized() const { return _init_state == being_initialized; } 580 bool is_in_error_state() const { return _init_state == initialization_error; } 581 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 582 ClassState init_state() { return (ClassState)_init_state; } 583 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 584 585 // defineClass specified verification 586 bool should_verify_class() const { 587 return (_misc_flags & _misc_should_verify_class) != 0; 588 } 589 void set_should_verify_class(bool value) { 590 if (value) { 591 _misc_flags |= _misc_should_verify_class; 592 } else { 593 _misc_flags &= ~_misc_should_verify_class; 594 } 595 } 596 597 // marking 598 bool is_marked_dependent() const { return _is_marked_dependent; } 599 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 600 601 static ByteSize extra_flags_offset() { return in_ByteSize(offset_of(InstanceKlass, _extra_flags)); } 602 603 // initialization (virtuals from Klass) 604 bool should_be_initialized() const; // means that initialize should be called 605 void initialize(TRAPS); 606 void link_class(TRAPS); 607 bool link_class_or_fail(TRAPS); // returns false on failure 608 void rewrite_class(TRAPS); 609 void link_methods(TRAPS); 610 Method* class_initializer() const; 611 612 // set the class to initialized if no static initializer is present 613 void eager_initialize(Thread *thread); 614 615 // reference type 616 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 617 void set_reference_type(ReferenceType t) { 618 assert(t == (u1)t, "overflow"); 619 _reference_type = (u1)t; 620 } 621 622 // this class cp index 623 u2 this_class_index() const { return _this_class_index; } 624 void set_this_class_index(u2 index) { _this_class_index = index; } 625 626 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 627 628 // find local field, returns true if found 629 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 630 // find field in direct superinterfaces, returns the interface in which the field is defined 631 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 632 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 633 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 634 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 635 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 636 637 // find a non-static or static field given its offset within the class. 638 bool contains_field_offset(int offset) { 639 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size(), is_value()); 640 } 641 642 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 643 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 644 645 private: 646 static int quick_search(const Array<Method*>* methods, const Symbol* name); 647 648 public: 649 static void disable_method_binary_search() { 650 _disable_method_binary_search = true; 651 } 652 653 // find a local method (returns NULL if not found) 654 Method* find_method(const Symbol* name, const Symbol* signature) const; 655 static Method* find_method(const Array<Method*>* methods, 656 const Symbol* name, 657 const Symbol* signature); 658 659 // find a local method, but skip static methods 660 Method* find_instance_method(const Symbol* name, const Symbol* signature, 661 PrivateLookupMode private_mode = find_private) const; 662 static Method* find_instance_method(const Array<Method*>* methods, 663 const Symbol* name, 664 const Symbol* signature, 665 PrivateLookupMode private_mode = find_private); 666 667 // find a local method (returns NULL if not found) 668 Method* find_local_method(const Symbol* name, 669 const Symbol* signature, 670 OverpassLookupMode overpass_mode, 671 StaticLookupMode static_mode, 672 PrivateLookupMode private_mode) const; 673 674 // find a local method from given methods array (returns NULL if not found) 675 static Method* find_local_method(const Array<Method*>* methods, 676 const Symbol* name, 677 const Symbol* signature, 678 OverpassLookupMode overpass_mode, 679 StaticLookupMode static_mode, 680 PrivateLookupMode private_mode); 681 682 // find a local method index in methods or default_methods (returns -1 if not found) 683 static int find_method_index(const Array<Method*>* methods, 684 const Symbol* name, 685 const Symbol* signature, 686 OverpassLookupMode overpass_mode, 687 StaticLookupMode static_mode, 688 PrivateLookupMode private_mode); 689 690 // lookup operation (returns NULL if not found) 691 Method* uncached_lookup_method(const Symbol* name, 692 const Symbol* signature, 693 OverpassLookupMode overpass_mode, 694 PrivateLookupMode private_mode = find_private) const; 695 696 // lookup a method in all the interfaces that this class implements 697 // (returns NULL if not found) 698 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 699 700 // lookup a method in local defaults then in all interfaces 701 // (returns NULL if not found) 702 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 703 704 // Find method indices by name. If a method with the specified name is 705 // found the index to the first method is returned, and 'end' is filled in 706 // with the index of first non-name-matching method. If no method is found 707 // -1 is returned. 708 int find_method_by_name(const Symbol* name, int* end) const; 709 static int find_method_by_name(const Array<Method*>* methods, 710 const Symbol* name, int* end); 711 712 // constant pool 713 ConstantPool* constants() const { return _constants; } 714 void set_constants(ConstantPool* c) { _constants = c; } 715 716 // protection domain 717 oop protection_domain() const; 718 719 // signers 720 objArrayOop signers() const; 721 722 // host class 723 InstanceKlass* unsafe_anonymous_host() const { 724 InstanceKlass** hk = adr_unsafe_anonymous_host(); 725 if (hk == NULL) { 726 assert(!is_unsafe_anonymous(), "Unsafe anonymous classes have host klasses"); 727 return NULL; 728 } else { 729 assert(*hk != NULL, "host klass should always be set if the address is not null"); 730 assert(is_unsafe_anonymous(), "Only unsafe anonymous classes have host klasses"); 731 return *hk; 732 } 733 } 734 void set_unsafe_anonymous_host(const InstanceKlass* host) { 735 assert(is_unsafe_anonymous(), "not unsafe anonymous"); 736 const InstanceKlass** addr = (const InstanceKlass **)adr_unsafe_anonymous_host(); 737 assert(addr != NULL, "no reversed space"); 738 if (addr != NULL) { 739 *addr = host; 740 } 741 } 742 bool is_unsafe_anonymous() const { 743 return (_misc_flags & _misc_is_unsafe_anonymous) != 0; 744 } 745 void set_is_unsafe_anonymous(bool value) { 746 if (value) { 747 _misc_flags |= _misc_is_unsafe_anonymous; 748 } else { 749 _misc_flags &= ~_misc_is_unsafe_anonymous; 750 } 751 } 752 753 bool is_contended() const { 754 return (_misc_flags & _misc_is_contended) != 0; 755 } 756 void set_is_contended(bool value) { 757 if (value) { 758 _misc_flags |= _misc_is_contended; 759 } else { 760 _misc_flags &= ~_misc_is_contended; 761 } 762 } 763 764 // source file name 765 Symbol* source_file_name() const { 766 return (_source_file_name_index == 0) ? 767 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index); 768 } 769 u2 source_file_name_index() const { 770 return _source_file_name_index; 771 } 772 void set_source_file_name_index(u2 sourcefile_index) { 773 _source_file_name_index = sourcefile_index; 774 } 775 776 // minor and major version numbers of class file 777 u2 minor_version() const { return _minor_version; } 778 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 779 u2 major_version() const { return _major_version; } 780 void set_major_version(u2 major_version) { _major_version = major_version; } 781 782 // source debug extension 783 const char* source_debug_extension() const { return _source_debug_extension; } 784 void set_source_debug_extension(const char* array, int length); 785 786 // symbol unloading support (refcount already added) 787 Symbol* array_name() { return _array_name; } 788 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; } 789 790 // nonstatic oop-map blocks 791 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 792 return oop_map_count * OopMapBlock::size_in_words(); 793 } 794 unsigned int nonstatic_oop_map_count() const { 795 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 796 } 797 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 798 void set_nonstatic_oop_map_size(int words) { 799 _nonstatic_oop_map_size = words; 800 } 801 802 #if INCLUDE_JVMTI 803 // Redefinition locking. Class can only be redefined by one thread at a time. 804 bool is_being_redefined() const { 805 return (_extra_flags & _extra_is_being_redefined); 806 } 807 void set_is_being_redefined(bool value) { 808 if (value) { 809 _extra_flags |= _extra_is_being_redefined; 810 } else { 811 _extra_flags &= ~_extra_is_being_redefined; 812 } 813 } 814 815 // RedefineClasses() support for previous versions: 816 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 817 void purge_previous_version_list(); 818 819 InstanceKlass* previous_versions() const { return _previous_versions; } 820 #else 821 InstanceKlass* previous_versions() const { return NULL; } 822 #endif 823 824 InstanceKlass* get_klass_version(int version) { 825 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 826 if (ik->constants()->version() == version) { 827 return ik; 828 } 829 } 830 return NULL; 831 } 832 833 bool has_been_redefined() const { 834 return (_misc_flags & _misc_has_been_redefined) != 0; 835 } 836 void set_has_been_redefined() { 837 _misc_flags |= _misc_has_been_redefined; 838 } 839 840 bool has_passed_fingerprint_check() const { 841 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0; 842 } 843 void set_has_passed_fingerprint_check(bool b) { 844 if (b) { 845 _misc_flags |= _misc_has_passed_fingerprint_check; 846 } else { 847 _misc_flags &= ~_misc_has_passed_fingerprint_check; 848 } 849 } 850 bool supers_have_passed_fingerprint_checks(); 851 852 static bool should_store_fingerprint(bool is_unsafe_anonymous); 853 bool should_store_fingerprint() const { return should_store_fingerprint(is_unsafe_anonymous()); } 854 bool has_stored_fingerprint() const; 855 uint64_t get_stored_fingerprint() const; 856 void store_fingerprint(uint64_t fingerprint); 857 858 bool is_scratch_class() const { 859 return (_misc_flags & _misc_is_scratch_class) != 0; 860 } 861 862 void set_is_scratch_class() { 863 _misc_flags |= _misc_is_scratch_class; 864 } 865 866 bool has_resolved_methods() const { 867 return (_extra_flags & _extra_has_resolved_methods) != 0; 868 } 869 870 void set_has_resolved_methods() { 871 _extra_flags |= _extra_has_resolved_methods; 872 } 873 private: 874 875 void set_kind(unsigned kind) { 876 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind"); 877 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos; 878 unsigned flags = _misc_flags & ~fmask; 879 _misc_flags = (flags | (kind << _misc_kind_field_pos)); 880 } 881 882 bool is_kind(unsigned desired) const { 883 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask; 884 return kind == desired; 885 } 886 887 public: 888 889 // Other is anything that is not one of the more specialized kinds of InstanceKlass. 890 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); } 891 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); } 892 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); } 893 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); } 894 bool is_value_type_klass() const { return is_kind(_misc_kind_value_type); } 895 896 #if INCLUDE_JVMTI 897 898 void init_previous_versions() { 899 _previous_versions = NULL; 900 } 901 902 private: 903 static bool _has_previous_versions; 904 public: 905 static void purge_previous_versions(InstanceKlass* ik) { 906 if (ik->has_been_redefined()) { 907 ik->purge_previous_version_list(); 908 } 909 } 910 911 static bool has_previous_versions_and_reset(); 912 static bool has_previous_versions() { return _has_previous_versions; } 913 914 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 915 void set_cached_class_file(JvmtiCachedClassFileData *data) { 916 _cached_class_file = data; 917 } 918 JvmtiCachedClassFileData * get_cached_class_file(); 919 jint get_cached_class_file_len(); 920 unsigned char * get_cached_class_file_bytes(); 921 922 // JVMTI: Support for caching of field indices, types, and offsets 923 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 924 _jvmti_cached_class_field_map = descriptor; 925 } 926 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 927 return _jvmti_cached_class_field_map; 928 } 929 #else // INCLUDE_JVMTI 930 931 static void purge_previous_versions(InstanceKlass* ik) { return; }; 932 static bool has_previous_versions_and_reset() { return false; } 933 934 void set_cached_class_file(JvmtiCachedClassFileData *data) { 935 assert(data == NULL, "unexpected call with JVMTI disabled"); 936 } 937 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; } 938 939 #endif // INCLUDE_JVMTI 940 941 bool has_nonstatic_concrete_methods() const { 942 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0; 943 } 944 void set_has_nonstatic_concrete_methods(bool b) { 945 if (b) { 946 _misc_flags |= _misc_has_nonstatic_concrete_methods; 947 } else { 948 _misc_flags &= ~_misc_has_nonstatic_concrete_methods; 949 } 950 } 951 952 bool declares_nonstatic_concrete_methods() const { 953 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0; 954 } 955 void set_declares_nonstatic_concrete_methods(bool b) { 956 if (b) { 957 _misc_flags |= _misc_declares_nonstatic_concrete_methods; 958 } else { 959 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods; 960 } 961 } 962 963 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 964 inline u2 next_method_idnum(); 965 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 966 967 // generics support 968 Symbol* generic_signature() const { 969 return (_generic_signature_index == 0) ? 970 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index); 971 } 972 u2 generic_signature_index() const { 973 return _generic_signature_index; 974 } 975 void set_generic_signature_index(u2 sig_index) { 976 _generic_signature_index = sig_index; 977 } 978 979 u2 enclosing_method_data(int offset) const; 980 u2 enclosing_method_class_index() const { 981 return enclosing_method_data(enclosing_method_class_index_offset); 982 } 983 u2 enclosing_method_method_index() { 984 return enclosing_method_data(enclosing_method_method_index_offset); 985 } 986 void set_enclosing_method_indices(u2 class_index, 987 u2 method_index); 988 989 // jmethodID support 990 jmethodID get_jmethod_id(const methodHandle& method_h); 991 jmethodID get_jmethod_id_fetch_or_update(size_t idnum, 992 jmethodID new_id, jmethodID* new_jmeths, 993 jmethodID* to_dealloc_id_p, 994 jmethodID** to_dealloc_jmeths_p); 995 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 996 size_t *length_p, jmethodID* id_p); 997 void ensure_space_for_methodids(int start_offset = 0); 998 jmethodID jmethod_id_or_null(Method* method); 999 1000 // annotations support 1001 Annotations* annotations() const { return _annotations; } 1002 void set_annotations(Annotations* anno) { _annotations = anno; } 1003 1004 AnnotationArray* class_annotations() const { 1005 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 1006 } 1007 Array<AnnotationArray*>* fields_annotations() const { 1008 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 1009 } 1010 AnnotationArray* class_type_annotations() const { 1011 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 1012 } 1013 Array<AnnotationArray*>* fields_type_annotations() const { 1014 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 1015 } 1016 // allocation 1017 instanceOop allocate_instance(TRAPS); 1018 1019 // additional member function to return a handle 1020 instanceHandle allocate_instance_handle(TRAPS); 1021 1022 objArrayOop allocate_objArray(int n, int length, TRAPS); 1023 // Helper function 1024 static instanceOop register_finalizer(instanceOop i, TRAPS); 1025 1026 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 1027 // if not, throw either an Error or an Exception. 1028 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 1029 1030 // initialization 1031 void call_class_initializer(TRAPS); 1032 void set_initialization_state_and_notify(ClassState state, TRAPS); 1033 1034 // OopMapCache support 1035 OopMapCache* oop_map_cache() { return _oop_map_cache; } 1036 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 1037 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 1038 1039 // JNI identifier support (for static fields - for jni performance) 1040 JNIid* jni_ids() { return _jni_ids; } 1041 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 1042 JNIid* jni_id_for(int offset); 1043 1044 // maintenance of deoptimization dependencies 1045 inline DependencyContext dependencies(); 1046 int mark_dependent_nmethods(KlassDepChange& changes); 1047 void add_dependent_nmethod(nmethod* nm); 1048 void remove_dependent_nmethod(nmethod* nm); 1049 void clean_dependency_context(); 1050 1051 // On-stack replacement support 1052 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 1053 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 1054 void add_osr_nmethod(nmethod* n); 1055 bool remove_osr_nmethod(nmethod* n); 1056 int mark_osr_nmethods(const Method* m); 1057 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 1058 1059 #if INCLUDE_JVMTI 1060 // Breakpoint support (see methods on Method* for details) 1061 BreakpointInfo* breakpoints() const { return _breakpoints; }; 1062 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 1063 #endif 1064 1065 // support for stub routines 1066 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 1067 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;) 1068 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 1069 1070 static ByteSize value_field_klasses_offset() { return in_ByteSize(offset_of(InstanceKlass, _value_field_klasses)); } 1071 static ByteSize adr_valueklass_fixed_block_offset() { return in_ByteSize(offset_of(InstanceKlass, _adr_valueklass_fixed_block)); } 1072 1073 // subclass/subinterface checks 1074 bool implements_interface(Klass* k) const; 1075 bool is_same_or_direct_interface(Klass* k) const; 1076 1077 #ifdef ASSERT 1078 // check whether this class or one of its superclasses was redefined 1079 bool has_redefined_this_or_super() const; 1080 #endif 1081 1082 // Access to the implementor of an interface. 1083 Klass* implementor() const; 1084 void set_implementor(Klass* k); 1085 int nof_implementors() const; 1086 void add_implementor(Klass* k); // k is a new class that implements this interface 1087 void init_implementor(); // initialize 1088 1089 // link this class into the implementors list of every interface it implements 1090 void process_interfaces(Thread *thread); 1091 1092 // virtual operations from Klass 1093 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 1094 Array<InstanceKlass*>* transitive_interfaces); 1095 bool can_be_primary_super_slow() const; 1096 int oop_size(oop obj) const { return size_helper(); } 1097 // slow because it's a virtual call and used for verifying the layout_helper. 1098 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 1099 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 1100 1101 // Iterators 1102 void do_local_static_fields(FieldClosure* cl); 1103 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 1104 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 1105 1106 void methods_do(void f(Method* method)); 1107 virtual void array_klasses_do(void f(Klass* k)); 1108 1109 static InstanceKlass* cast(Klass* k) { 1110 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 1111 } 1112 1113 static const InstanceKlass* cast(const Klass* k) { 1114 assert(k != NULL, "k should not be null"); 1115 assert(k->is_instance_klass(), "cast to InstanceKlass"); 1116 return static_cast<const InstanceKlass*>(k); 1117 } 1118 1119 virtual InstanceKlass* java_super() const { 1120 return (super() == NULL) ? NULL : cast(super()); 1121 } 1122 1123 // Sizing (in words) 1124 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 1125 1126 static int size(int vtable_length, int itable_length, 1127 int nonstatic_oop_map_size, 1128 bool is_interface, bool is_unsafe_anonymous, bool has_stored_fingerprint, 1129 int java_fields, bool is_value_type) { 1130 return align_metadata_size(header_size() + 1131 vtable_length + 1132 itable_length + 1133 nonstatic_oop_map_size + 1134 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) + 1135 (is_unsafe_anonymous ? (int)sizeof(Klass*)/wordSize : 0) + 1136 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0) + 1137 (java_fields * (int)sizeof(Klass*)/wordSize) + 1138 (is_value_type ? (int)sizeof(ValueKlassFixedBlock) : 0)); 1139 } 1140 int size() const { return size(vtable_length(), 1141 itable_length(), 1142 nonstatic_oop_map_size(), 1143 is_interface(), 1144 is_unsafe_anonymous(), 1145 has_stored_fingerprint(), 1146 has_value_fields() ? java_fields_count() : 0, 1147 is_value()); 1148 } 1149 #if INCLUDE_SERVICES 1150 virtual void collect_statistics(KlassSizeStats *sz) const; 1151 #endif 1152 1153 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); } 1154 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 1155 1156 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 1157 1158 oop static_field_base_raw() { return java_mirror(); } 1159 1160 bool bounds_check(address addr, bool edge_ok = false, intptr_t size_in_bytes = -1) const PRODUCT_RETURN0; 1161 1162 OopMapBlock* start_of_nonstatic_oop_maps() const { 1163 return (OopMapBlock*)(start_of_itable() + itable_length()); 1164 } 1165 1166 Klass** end_of_nonstatic_oop_maps() const { 1167 return (Klass**)(start_of_nonstatic_oop_maps() + 1168 nonstatic_oop_map_count()); 1169 } 1170 1171 Klass* volatile* adr_implementor() const { 1172 if (is_interface()) { 1173 return (Klass* volatile*)end_of_nonstatic_oop_maps(); 1174 } else { 1175 return NULL; 1176 } 1177 }; 1178 1179 InstanceKlass** adr_unsafe_anonymous_host() const { 1180 if (is_unsafe_anonymous()) { 1181 InstanceKlass** adr_impl = (InstanceKlass**)adr_implementor(); 1182 if (adr_impl != NULL) { 1183 return adr_impl + 1; 1184 } else { 1185 return (InstanceKlass **)end_of_nonstatic_oop_maps(); 1186 } 1187 } else { 1188 return NULL; 1189 } 1190 } 1191 1192 address adr_fingerprint() const { 1193 if (has_stored_fingerprint()) { 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 address adr_value_fields_klasses() const { 1211 if (has_value_fields()) { 1212 address adr_fing = adr_fingerprint(); 1213 if (adr_fing != NULL) { 1214 return adr_fingerprint() + sizeof(u8); 1215 } 1216 1217 InstanceKlass** adr_host = adr_unsafe_anonymous_host(); 1218 if (adr_host != NULL) { 1219 return (address)(adr_host + 1); 1220 } 1221 1222 Klass* volatile* adr_impl = adr_implementor(); 1223 if (adr_impl != NULL) { 1224 return (address)(adr_impl + 1); 1225 } 1226 1227 return (address)end_of_nonstatic_oop_maps(); 1228 } else { 1229 return NULL; 1230 } 1231 } 1232 1233 Klass* get_value_field_klass(int idx) const { 1234 assert(has_value_fields(), "Sanity checking"); 1235 Klass* k = ((Klass**)adr_value_fields_klasses())[idx]; 1236 assert(k != NULL, "Should always be set before being read"); 1237 assert(k->is_value(), "Must be a value type"); 1238 return k; 1239 } 1240 1241 Klass* get_value_field_klass_or_null(int idx) const { 1242 assert(has_value_fields(), "Sanity checking"); 1243 Klass* k = ((Klass**)adr_value_fields_klasses())[idx]; 1244 assert(k == NULL || k->is_value(), "Must be a value type"); 1245 return k; 1246 } 1247 1248 void set_value_field_klass(int idx, Klass* k) { 1249 assert(has_value_fields(), "Sanity checking"); 1250 assert(k != NULL, "Should not be set to NULL"); 1251 assert(((Klass**)adr_value_fields_klasses())[idx] == NULL, "Should not be set twice"); 1252 ((Klass**)adr_value_fields_klasses())[idx] = k; 1253 } 1254 1255 // Use this to return the size of an instance in heap words: 1256 virtual int size_helper() const { 1257 return layout_helper_to_size_helper(layout_helper()); 1258 } 1259 1260 // This bit is initialized in classFileParser.cpp. 1261 // It is false under any of the following conditions: 1262 // - the class is abstract (including any interface) 1263 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1264 // - the class size is larger than FastAllocateSizeLimit 1265 // - the class is java/lang/Class, which cannot be allocated directly 1266 bool can_be_fastpath_allocated() const { 1267 return !layout_helper_needs_slow_path(layout_helper()); 1268 } 1269 1270 // Java itable 1271 klassItable itable() const; // return klassItable wrapper 1272 Method* method_at_itable(Klass* holder, int index, TRAPS); 1273 1274 #if INCLUDE_JVMTI 1275 void adjust_default_methods(bool* trace_name_printed); 1276 #endif // INCLUDE_JVMTI 1277 1278 void clean_weak_instanceklass_links(); 1279 private: 1280 void clean_implementors_list(); 1281 void clean_method_data(); 1282 1283 public: 1284 // Explicit metaspace deallocation of fields 1285 // For RedefineClasses and class file parsing errors, we need to deallocate 1286 // instanceKlasses and the metadata they point to. 1287 void deallocate_contents(ClassLoaderData* loader_data); 1288 static void deallocate_methods(ClassLoaderData* loader_data, 1289 Array<Method*>* methods); 1290 void static deallocate_interfaces(ClassLoaderData* loader_data, 1291 const Klass* super_klass, 1292 Array<InstanceKlass*>* local_interfaces, 1293 Array<InstanceKlass*>* transitive_interfaces); 1294 1295 // The constant pool is on stack if any of the methods are executing or 1296 // referenced by handles. 1297 bool on_stack() const { return _constants->on_stack(); } 1298 1299 // callbacks for actions during class unloading 1300 static void unload_class(InstanceKlass* ik); 1301 static void release_C_heap_structures(InstanceKlass* ik); 1302 1303 // Naming 1304 const char* signature_name() const; 1305 const char* signature_name_of(char c) const; 1306 static Symbol* package_from_name(const Symbol* name, TRAPS); 1307 1308 // Oop fields (and metadata) iterators 1309 // 1310 // The InstanceKlass iterators also visits the Object's klass. 1311 1312 // Forward iteration 1313 public: 1314 // Iterate over all oop fields in the oop maps. 1315 template <typename T, class OopClosureType> 1316 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1317 1318 // Iterate over all oop fields and metadata. 1319 template <typename T, class OopClosureType> 1320 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 1321 1322 // Iterate over all oop fields in one oop map. 1323 template <typename T, class OopClosureType> 1324 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1325 1326 1327 // Reverse iteration 1328 // Iterate over all oop fields and metadata. 1329 template <typename T, class OopClosureType> 1330 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1331 1332 private: 1333 // Iterate over all oop fields in the oop maps. 1334 template <typename T, class OopClosureType> 1335 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1336 1337 // Iterate over all oop fields in one oop map. 1338 template <typename T, class OopClosureType> 1339 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1340 1341 1342 // Bounded range iteration 1343 public: 1344 // Iterate over all oop fields in the oop maps. 1345 template <typename T, class OopClosureType> 1346 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1347 1348 // Iterate over all oop fields and metadata. 1349 template <typename T, class OopClosureType> 1350 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1351 1352 private: 1353 // Iterate over all oop fields in one oop map. 1354 template <typename T, class OopClosureType> 1355 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1356 1357 1358 public: 1359 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1360 1361 public: 1362 void set_in_error_state() { 1363 assert(DumpSharedSpaces, "only call this when dumping archive"); 1364 _init_state = initialization_error; 1365 } 1366 bool check_sharing_error_state(); 1367 1368 private: 1369 // initialization state 1370 void set_init_state(ClassState state); 1371 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1372 void set_init_thread(Thread *thread) { _init_thread = thread; } 1373 1374 // The RedefineClasses() API can cause new method idnums to be needed 1375 // which will cause the caches to grow. Safety requires different 1376 // cache management logic if the caches can grow instead of just 1377 // going from NULL to non-NULL. 1378 bool idnum_can_increment() const { return has_been_redefined(); } 1379 inline jmethodID* methods_jmethod_ids_acquire() const; 1380 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1381 1382 // Lock during initialization 1383 public: 1384 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1385 // Must be one per class and it has to be a VM internal object so java code 1386 // cannot lock it (like the mirror). 1387 // It has to be an object not a Mutex because it's held through java calls. 1388 oop init_lock() const; 1389 private: 1390 void fence_and_clear_init_lock(); 1391 1392 bool link_class_impl (TRAPS); 1393 bool verify_code (TRAPS); 1394 void initialize_impl (TRAPS); 1395 void initialize_super_interfaces (TRAPS); 1396 void eager_initialize_impl (); 1397 /* jni_id_for_impl for jfieldID only */ 1398 JNIid* jni_id_for_impl (int offset); 1399 protected: 1400 // Returns the array class for the n'th dimension 1401 virtual Klass* array_klass_impl(ArrayStorageProperties storage_props, bool or_null, int n, TRAPS); 1402 1403 // Returns the array class with this class as element type 1404 virtual Klass* array_klass_impl(ArrayStorageProperties storage_props, bool or_null, TRAPS); 1405 1406 private: 1407 1408 // find a local method (returns NULL if not found) 1409 Method* find_method_impl(const Symbol* name, 1410 const Symbol* signature, 1411 OverpassLookupMode overpass_mode, 1412 StaticLookupMode static_mode, 1413 PrivateLookupMode private_mode) const; 1414 1415 static Method* find_method_impl(const Array<Method*>* methods, 1416 const Symbol* name, 1417 const Symbol* signature, 1418 OverpassLookupMode overpass_mode, 1419 StaticLookupMode static_mode, 1420 PrivateLookupMode private_mode); 1421 1422 // Free CHeap allocated fields. 1423 void release_C_heap_structures(); 1424 1425 #if INCLUDE_JVMTI 1426 // RedefineClasses support 1427 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1428 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1429 #endif 1430 public: 1431 // CDS support - remove and restore oops from metadata. Oops are not shared. 1432 virtual void remove_unshareable_info(); 1433 virtual void remove_java_mirror(); 1434 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 1435 1436 // jvm support 1437 jint compute_modifier_flags(TRAPS) const; 1438 1439 public: 1440 // JVMTI support 1441 jint jvmti_class_status() const; 1442 1443 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 1444 1445 public: 1446 // Printing 1447 #ifndef PRODUCT 1448 void print_on(outputStream* st) const; 1449 #endif 1450 void print_value_on(outputStream* st) const; 1451 1452 void oop_print_value_on(oop obj, outputStream* st); 1453 1454 #ifndef PRODUCT 1455 void oop_print_on (oop obj, outputStream* st); 1456 1457 void print_dependent_nmethods(bool verbose = false); 1458 bool is_dependent_nmethod(nmethod* nm); 1459 bool verify_itable_index(int index); 1460 #endif 1461 1462 const char* internal_name() const; 1463 1464 // Verification 1465 void verify_on(outputStream* st); 1466 1467 void oop_verify_on(oop obj, outputStream* st); 1468 1469 // Logging 1470 void print_class_load_logging(ClassLoaderData* loader_data, 1471 const char* module_name, 1472 const ClassFileStream* cfs) const; 1473 }; 1474 1475 // for adding methods 1476 // UNSET_IDNUM return means no more ids available 1477 inline u2 InstanceKlass::next_method_idnum() { 1478 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1479 return ConstMethod::UNSET_IDNUM; // no more ids available 1480 } else { 1481 return _idnum_allocated_count++; 1482 } 1483 } 1484 1485 1486 /* JNIid class for jfieldIDs only */ 1487 class JNIid: public CHeapObj<mtClass> { 1488 friend class VMStructs; 1489 private: 1490 Klass* _holder; 1491 JNIid* _next; 1492 int _offset; 1493 #ifdef ASSERT 1494 bool _is_static_field_id; 1495 #endif 1496 1497 public: 1498 // Accessors 1499 Klass* holder() const { return _holder; } 1500 int offset() const { return _offset; } 1501 JNIid* next() { return _next; } 1502 // Constructor 1503 JNIid(Klass* holder, int offset, JNIid* next); 1504 // Identifier lookup 1505 JNIid* find(int offset); 1506 1507 bool find_local_field(fieldDescriptor* fd) { 1508 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1509 } 1510 1511 static void deallocate(JNIid* id); 1512 // Debugging 1513 #ifdef ASSERT 1514 bool is_static_field_id() const { return _is_static_field_id; } 1515 void set_is_static_field_id() { _is_static_field_id = true; } 1516 #endif 1517 void verify(Klass* holder); 1518 }; 1519 1520 // An iterator that's used to access the inner classes indices in the 1521 // InstanceKlass::_inner_classes array. 1522 class InnerClassesIterator : public StackObj { 1523 private: 1524 Array<jushort>* _inner_classes; 1525 int _length; 1526 int _idx; 1527 public: 1528 1529 InnerClassesIterator(const InstanceKlass* k) { 1530 _inner_classes = k->inner_classes(); 1531 if (k->inner_classes() != NULL) { 1532 _length = _inner_classes->length(); 1533 // The inner class array's length should be the multiple of 1534 // inner_class_next_offset if it only contains the InnerClasses 1535 // attribute data, or it should be 1536 // n*inner_class_next_offset+enclosing_method_attribute_size 1537 // if it also contains the EnclosingMethod data. 1538 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1539 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1540 "just checking"); 1541 // Remove the enclosing_method portion if exists. 1542 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1543 _length -= InstanceKlass::enclosing_method_attribute_size; 1544 } 1545 } else { 1546 _length = 0; 1547 } 1548 _idx = 0; 1549 } 1550 1551 int length() const { 1552 return _length; 1553 } 1554 1555 void next() { 1556 _idx += InstanceKlass::inner_class_next_offset; 1557 } 1558 1559 bool done() const { 1560 return (_idx >= _length); 1561 } 1562 1563 u2 inner_class_info_index() const { 1564 return _inner_classes->at( 1565 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1566 } 1567 1568 void set_inner_class_info_index(u2 index) { 1569 _inner_classes->at_put( 1570 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1571 } 1572 1573 u2 outer_class_info_index() const { 1574 return _inner_classes->at( 1575 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1576 } 1577 1578 void set_outer_class_info_index(u2 index) { 1579 _inner_classes->at_put( 1580 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1581 } 1582 1583 u2 inner_name_index() const { 1584 return _inner_classes->at( 1585 _idx + InstanceKlass::inner_class_inner_name_offset); 1586 } 1587 1588 void set_inner_name_index(u2 index) { 1589 _inner_classes->at_put( 1590 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1591 } 1592 1593 u2 inner_access_flags() const { 1594 return _inner_classes->at( 1595 _idx + InstanceKlass::inner_class_access_flags_offset); 1596 } 1597 }; 1598 1599 #endif // SHARE_OOPS_INSTANCEKLASS_HPP