1 /* 2 * Copyright (c) 1997, 2018, 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_VM_OOPS_INSTANCEKLASS_HPP 26 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP 27 28 #include "classfile/classLoader.hpp" 29 #include "classfile/classLoaderData.hpp" 30 #include "classfile/moduleEntry.hpp" 31 #include "classfile/packageEntry.hpp" 32 #include "memory/referenceType.hpp" 33 #include "oops/annotations.hpp" 34 #include "oops/constMethod.hpp" 35 #include "oops/fieldInfo.hpp" 36 #include "oops/instanceOop.hpp" 37 #include "oops/klassVtable.hpp" 38 #include "runtime/handles.hpp" 39 #include "runtime/os.hpp" 40 #include "utilities/accessFlags.hpp" 41 #include "utilities/align.hpp" 42 #include "utilities/macros.hpp" 43 #if INCLUDE_JFR 44 #include "jfr/support/jfrKlassExtension.hpp" 45 #endif 46 47 48 // An InstanceKlass is the VM level representation of a Java class. 49 // It contains all information needed for at class at execution runtime. 50 51 // InstanceKlass embedded field layout (after declared fields): 52 // [EMBEDDED Java vtable ] size in words = vtable_len 53 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size 54 // The embedded nonstatic oop-map blocks are short pairs (offset, length) 55 // indicating where oops are located in instances of this klass. 56 // [EMBEDDED implementor of the interface] only exist for interface 57 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled) 58 // [EMBEDDED fingerprint ] only if should_store_fingerprint()==true 59 60 61 // forward declaration for class -- see below for definition 62 #if INCLUDE_JVMTI 63 class BreakpointInfo; 64 #endif 65 class ClassFileParser; 66 class KlassDepChange; 67 class DependencyContext; 68 class fieldDescriptor; 69 class jniIdMapBase; 70 class JNIid; 71 class JvmtiCachedClassFieldMap; 72 class SuperTypeClosure; 73 74 // This is used in iterators below. 75 class FieldClosure: public StackObj { 76 public: 77 virtual void do_field(fieldDescriptor* fd) = 0; 78 }; 79 80 #ifndef PRODUCT 81 // Print fields. 82 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. 83 class FieldPrinter: public FieldClosure { 84 oop _obj; 85 outputStream* _st; 86 public: 87 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} 88 void do_field(fieldDescriptor* fd); 89 }; 90 #endif // !PRODUCT 91 92 // Describes where oops are located in instances of this klass. 93 class OopMapBlock { 94 public: 95 // Byte offset of the first oop mapped by this block. 96 int offset() const { return _offset; } 97 void set_offset(int offset) { _offset = offset; } 98 99 // Number of oops in this block. 100 uint count() const { return _count; } 101 void set_count(uint count) { _count = count; } 102 103 // sizeof(OopMapBlock) in words. 104 static const int size_in_words() { 105 return align_up((int)sizeof(OopMapBlock), wordSize) >> 106 LogBytesPerWord; 107 } 108 109 private: 110 int _offset; 111 uint _count; 112 }; 113 114 struct JvmtiCachedClassFileData; 115 116 class InstanceKlass: public Klass { 117 friend class VMStructs; 118 friend class JVMCIVMStructs; 119 friend class ClassFileParser; 120 friend class CompileReplay; 121 122 public: 123 static const KlassID ID = InstanceKlassID; 124 125 protected: 126 InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id = ID); 127 128 public: 129 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } 130 131 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 132 // of the class loading & initialization procedure, and the use of the states. 133 enum ClassState { 134 allocated, // allocated (but not yet linked) 135 loaded, // loaded and inserted in class hierarchy (but not linked yet) 136 linked, // successfully linked/verified (but not initialized yet) 137 being_initialized, // currently running class initializer 138 fully_initialized, // initialized (successfull final state) 139 initialization_error // error happened during initialization 140 }; 141 142 private: 143 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS); 144 145 protected: 146 // If you add a new field that points to any metaspace object, you 147 // must add this field to InstanceKlass::metaspace_pointers_do(). 148 149 // Annotations for this class 150 Annotations* _annotations; 151 // Package this class is defined in 152 PackageEntry* _package_entry; 153 // Array classes holding elements of this class. 154 Klass* volatile _array_klasses; 155 // Constant pool for this class. 156 ConstantPool* _constants; 157 // The InnerClasses attribute and EnclosingMethod attribute. The 158 // _inner_classes is an array of shorts. If the class has InnerClasses 159 // attribute, then the _inner_classes array begins with 4-tuples of shorts 160 // [inner_class_info_index, outer_class_info_index, 161 // inner_name_index, inner_class_access_flags] for the InnerClasses 162 // attribute. If the EnclosingMethod attribute exists, it occupies the 163 // last two shorts [class_index, method_index] of the array. If only 164 // the InnerClasses attribute exists, the _inner_classes array length is 165 // number_of_inner_classes * 4. If the class has both InnerClasses 166 // and EnclosingMethod attributes the _inner_classes array length is 167 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 168 Array<jushort>* _inner_classes; 169 170 // The NestMembers attribute. An array of shorts, where each is a 171 // class info index for the class that is a nest member. This data 172 // has not been validated. 173 Array<jushort>* _nest_members; 174 175 // The NestHost attribute. The class info index for the class 176 // that is the nest-host of this class. This data has not been validated. 177 jushort _nest_host_index; 178 179 // Resolved nest-host klass: either true nest-host or self if we are not nested. 180 // By always being set it makes nest-member access checks simpler. 181 InstanceKlass* _nest_host; 182 183 // the source debug extension for this klass, NULL if not specified. 184 // Specified as UTF-8 string without terminating zero byte in the classfile, 185 // it is stored in the instanceklass as a NULL-terminated UTF-8 string 186 const char* _source_debug_extension; 187 // Array name derived from this class which needs unreferencing 188 // if this class is unloaded. 189 Symbol* _array_name; 190 191 // Number of heapOopSize words used by non-static fields in this klass 192 // (including inherited fields but after header_size()). 193 int _nonstatic_field_size; 194 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 195 // Constant pool index to the utf8 entry of the Generic signature, 196 // or 0 if none. 197 u2 _generic_signature_index; 198 // Constant pool index to the utf8 entry for the name of source file 199 // containing this klass, 0 if not specified. 200 u2 _source_file_name_index; 201 u2 _static_oop_field_count;// number of static oop fields in this klass 202 u2 _java_fields_count; // The number of declared Java fields 203 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 204 205 int _itable_len; // length of Java itable (in words) 206 // _is_marked_dependent can be set concurrently, thus cannot be part of the 207 // _misc_flags. 208 bool _is_marked_dependent; // used for marking during flushing and deoptimization 209 bool _is_being_redefined; // used for locking redefinition 210 211 // The low two bits of _misc_flags contains the kind field. 212 // This can be used to quickly discriminate among the four kinds of 213 // InstanceKlass. 214 215 static const unsigned _misc_kind_field_size = 2; 216 static const unsigned _misc_kind_field_pos = 0; 217 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u; 218 219 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass 220 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass 221 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass 222 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass 223 224 // Start after _misc_kind field. 225 enum { 226 _misc_rewritten = 1 << 2, // methods rewritten. 227 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops 228 _misc_should_verify_class = 1 << 4, // allow caching of preverification 229 _misc_is_anonymous = 1 << 5, // has embedded _host_klass field 230 _misc_is_contended = 1 << 6, // marked with contended annotation 231 _misc_has_nonstatic_concrete_methods = 1 << 7, // class/superclass/implemented interfaces has non-static, concrete methods 232 _misc_declares_nonstatic_concrete_methods = 1 << 8, // directly declares non-static, concrete methods 233 _misc_has_been_redefined = 1 << 9, // class has been redefined 234 _misc_has_passed_fingerprint_check = 1 << 10, // when this class was loaded, the fingerprint computed from its 235 // code source was found to be matching the value recorded by AOT. 236 _misc_is_scratch_class = 1 << 11, // class is the redefined scratch class 237 _misc_is_shared_boot_class = 1 << 12, // defining class loader is boot class loader 238 _misc_is_shared_platform_class = 1 << 13, // defining class loader is platform class loader 239 _misc_is_shared_app_class = 1 << 14, // defining class loader is app class loader 240 _misc_has_resolved_methods = 1 << 15 // resolved methods table entries added for this class 241 }; 242 u2 loader_type_bits() { 243 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class; 244 } 245 u2 _misc_flags; 246 u2 _minor_version; // minor version number of class file 247 u2 _major_version; // major version number of class file 248 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) 249 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 250 JNIid* _jni_ids; // First JNI identifier for static fields in this class 251 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 252 intptr_t _dep_context; // packed DependencyContext structure 253 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 254 #if INCLUDE_JVMTI 255 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 256 // Linked instanceKlasses of previous versions 257 InstanceKlass* _previous_versions; 258 // JVMTI fields can be moved to their own structure - see 6315920 259 // JVMTI: cached class file, before retransformable agent modified it in CFLH 260 JvmtiCachedClassFileData* _cached_class_file; 261 #endif 262 263 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 264 265 // Class states are defined as ClassState (see above). 266 // Place the _init_state here to utilize the unused 2-byte after 267 // _idnum_allocated_count. 268 u1 _init_state; // state of class 269 u1 _reference_type; // reference type 270 271 u2 _this_class_index; // constant pool entry 272 #if INCLUDE_JVMTI 273 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 274 #endif 275 276 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 277 278 // Method array. 279 Array<Method*>* _methods; 280 // Default Method Array, concrete methods inherited from interfaces 281 Array<Method*>* _default_methods; 282 // Interfaces (InstanceKlass*s) this class declares locally to implement. 283 Array<InstanceKlass*>* _local_interfaces; 284 // Interfaces (InstanceKlass*s) this class implements transitively. 285 Array<InstanceKlass*>* _transitive_interfaces; 286 // Int array containing the original order of method in the class file (for JVMTI). 287 Array<int>* _method_ordering; 288 // Int array containing the vtable_indices for default_methods 289 // offset matches _default_methods offset 290 Array<int>* _default_vtable_indices; 291 292 // Instance and static variable information, starts with 6-tuples of shorts 293 // [access, name index, sig index, initval index, low_offset, high_offset] 294 // for all fields, followed by the generic signature data at the end of 295 // the array. Only fields with generic signature attributes have the generic 296 // signature data set in the array. The fields array looks like following: 297 // 298 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 299 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 300 // ... 301 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 302 // [generic signature index] 303 // [generic signature index] 304 // ... 305 Array<u2>* _fields; 306 307 // embedded Java vtable follows here 308 // embedded Java itables follows here 309 // embedded static fields follows here 310 // embedded nonstatic oop-map blocks follows here 311 // embedded implementor of this interface follows here 312 // The embedded implementor only exists if the current klass is an 313 // iterface. The possible values of the implementor fall into following 314 // three cases: 315 // NULL: no implementor. 316 // A Klass* that's not itself: one implementor. 317 // Itself: more than one implementors. 318 // embedded host klass follows here 319 // The embedded host klass only exists in an anonymous class for 320 // dynamic language support (JSR 292 enabled). The host class grants 321 // its access privileges to this class also. The host class is either 322 // named, or a previously loaded anonymous class. A non-anonymous class 323 // or an anonymous class loaded through normal classloading does not 324 // have this embedded field. 325 // 326 327 friend class SystemDictionary; 328 329 public: 330 u2 loader_type() { 331 return _misc_flags & loader_type_bits(); 332 } 333 334 bool is_shared_boot_class() const { 335 return (_misc_flags & _misc_is_shared_boot_class) != 0; 336 } 337 bool is_shared_platform_class() const { 338 return (_misc_flags & _misc_is_shared_platform_class) != 0; 339 } 340 bool is_shared_app_class() const { 341 return (_misc_flags & _misc_is_shared_app_class) != 0; 342 } 343 344 void clear_class_loader_type() { 345 _misc_flags &= ~loader_type_bits(); 346 } 347 348 void set_class_loader_type(s2 loader_type) { 349 switch (loader_type) { 350 case ClassLoader::BOOT_LOADER: 351 _misc_flags |= _misc_is_shared_boot_class; 352 break; 353 case ClassLoader::PLATFORM_LOADER: 354 _misc_flags |= _misc_is_shared_platform_class; 355 break; 356 case ClassLoader::APP_LOADER: 357 _misc_flags |= _misc_is_shared_app_class; 358 break; 359 default: 360 ShouldNotReachHere(); 361 break; 362 } 363 } 364 365 bool has_nonstatic_fields() const { 366 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 367 } 368 void set_has_nonstatic_fields(bool b) { 369 if (b) { 370 _misc_flags |= _misc_has_nonstatic_fields; 371 } else { 372 _misc_flags &= ~_misc_has_nonstatic_fields; 373 } 374 } 375 376 // field sizes 377 int nonstatic_field_size() const { return _nonstatic_field_size; } 378 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 379 380 int static_field_size() const { return _static_field_size; } 381 void set_static_field_size(int size) { _static_field_size = size; } 382 383 int static_oop_field_count() const { return (int)_static_oop_field_count; } 384 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 385 386 // Java itable 387 int itable_length() const { return _itable_len; } 388 void set_itable_length(int len) { _itable_len = len; } 389 390 // array klasses 391 Klass* array_klasses() const { return _array_klasses; } 392 inline Klass* array_klasses_acquire() const; // load with acquire semantics 393 void set_array_klasses(Klass* k) { _array_klasses = k; } 394 inline void release_set_array_klasses(Klass* k); // store with release semantics 395 396 // methods 397 Array<Method*>* methods() const { return _methods; } 398 void set_methods(Array<Method*>* a) { _methods = a; } 399 Method* method_with_idnum(int idnum); 400 Method* method_with_orig_idnum(int idnum); 401 Method* method_with_orig_idnum(int idnum, int version); 402 403 // method ordering 404 Array<int>* method_ordering() const { return _method_ordering; } 405 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 406 void copy_method_ordering(const intArray* m, TRAPS); 407 408 // default_methods 409 Array<Method*>* default_methods() const { return _default_methods; } 410 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 411 412 // default method vtable_indices 413 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 414 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 415 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 416 417 // interfaces 418 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; } 419 void set_local_interfaces(Array<InstanceKlass*>* a) { 420 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 421 _local_interfaces = a; } 422 423 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; } 424 void set_transitive_interfaces(Array<InstanceKlass*>* a) { 425 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 426 _transitive_interfaces = a; 427 } 428 429 private: 430 friend class fieldDescriptor; 431 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 432 433 public: 434 int field_offset (int index) const { return field(index)->offset(); } 435 int field_access_flags(int index) const { return field(index)->access_flags(); } 436 Symbol* field_name (int index) const { return field(index)->name(constants()); } 437 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 438 439 // Number of Java declared fields 440 int java_fields_count() const { return (int)_java_fields_count; } 441 442 Array<u2>* fields() const { return _fields; } 443 void set_fields(Array<u2>* f, u2 java_fields_count) { 444 guarantee(_fields == NULL || f == NULL, "Just checking"); 445 _fields = f; 446 _java_fields_count = java_fields_count; 447 } 448 449 // inner classes 450 Array<u2>* inner_classes() const { return _inner_classes; } 451 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 452 453 // nest members 454 Array<u2>* nest_members() const { return _nest_members; } 455 void set_nest_members(Array<u2>* m) { _nest_members = m; } 456 457 // nest-host index 458 jushort nest_host_index() const { return _nest_host_index; } 459 void set_nest_host_index(u2 i) { _nest_host_index = i; } 460 461 private: 462 // Called to verify that k is a member of this nest - does not look at k's nest-host 463 bool has_nest_member(InstanceKlass* k, TRAPS) const; 464 public: 465 // Returns nest-host class, resolving and validating it if needed 466 // Returns NULL if an exception occurs during loading, or validation fails 467 InstanceKlass* nest_host(Symbol* validationException, TRAPS); 468 // Check if this klass is a nestmate of k - resolves this nest-host and k's 469 bool has_nestmate_access_to(InstanceKlass* k, TRAPS); 470 471 enum InnerClassAttributeOffset { 472 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 473 inner_class_inner_class_info_offset = 0, 474 inner_class_outer_class_info_offset = 1, 475 inner_class_inner_name_offset = 2, 476 inner_class_access_flags_offset = 3, 477 inner_class_next_offset = 4 478 }; 479 480 enum EnclosingMethodAttributeOffset { 481 enclosing_method_class_index_offset = 0, 482 enclosing_method_method_index_offset = 1, 483 enclosing_method_attribute_size = 2 484 }; 485 486 // method override check 487 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 488 489 // package 490 PackageEntry* package() const { return _package_entry; } 491 ModuleEntry* module() const; 492 bool in_unnamed_package() const { return (_package_entry == NULL); } 493 void set_package(PackageEntry* p) { _package_entry = p; } 494 void set_package(ClassLoaderData* loader_data, TRAPS); 495 bool is_same_class_package(const Klass* class2) const; 496 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const; 497 498 // find an enclosing class 499 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const; 500 501 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index. 502 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const; 503 504 private: 505 // Check prohibited package ("java/" only loadable by boot or platform loaders) 506 static void check_prohibited_package(Symbol* class_name, 507 ClassLoaderData* loader_data, 508 TRAPS); 509 public: 510 // tell if two classes have the same enclosing class (at package level) 511 bool is_same_package_member(const Klass* class2, TRAPS) const; 512 513 // initialization state 514 bool is_loaded() const { return _init_state >= loaded; } 515 bool is_linked() const { return _init_state >= linked; } 516 bool is_initialized() const { return _init_state == fully_initialized; } 517 bool is_not_initialized() const { return _init_state < being_initialized; } 518 bool is_being_initialized() const { return _init_state == being_initialized; } 519 bool is_in_error_state() const { return _init_state == initialization_error; } 520 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 521 ClassState init_state() { return (ClassState)_init_state; } 522 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 523 524 // defineClass specified verification 525 bool should_verify_class() const { 526 return (_misc_flags & _misc_should_verify_class) != 0; 527 } 528 void set_should_verify_class(bool value) { 529 if (value) { 530 _misc_flags |= _misc_should_verify_class; 531 } else { 532 _misc_flags &= ~_misc_should_verify_class; 533 } 534 } 535 536 // marking 537 bool is_marked_dependent() const { return _is_marked_dependent; } 538 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 539 540 // initialization (virtuals from Klass) 541 bool should_be_initialized() const; // means that initialize should be called 542 void initialize(TRAPS); 543 void link_class(TRAPS); 544 bool link_class_or_fail(TRAPS); // returns false on failure 545 void unlink_class(); 546 void rewrite_class(TRAPS); 547 void link_methods(TRAPS); 548 Method* class_initializer() const; 549 550 // set the class to initialized if no static initializer is present 551 void eager_initialize(Thread *thread); 552 553 // reference type 554 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 555 void set_reference_type(ReferenceType t) { 556 assert(t == (u1)t, "overflow"); 557 _reference_type = (u1)t; 558 } 559 560 // this class cp index 561 u2 this_class_index() const { return _this_class_index; } 562 void set_this_class_index(u2 index) { _this_class_index = index; } 563 564 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 565 566 // find local field, returns true if found 567 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 568 // find field in direct superinterfaces, returns the interface in which the field is defined 569 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 570 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 571 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 572 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 573 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 574 575 // find a non-static or static field given its offset within the class. 576 bool contains_field_offset(int offset) { 577 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); 578 } 579 580 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 581 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 582 583 // find a local method (returns NULL if not found) 584 Method* find_method(const Symbol* name, const Symbol* signature) const; 585 static Method* find_method(const Array<Method*>* methods, 586 const Symbol* name, 587 const Symbol* signature); 588 589 // find a local method, but skip static methods 590 Method* find_instance_method(const Symbol* name, const Symbol* signature, 591 PrivateLookupMode private_mode = find_private) const; 592 static Method* find_instance_method(const Array<Method*>* methods, 593 const Symbol* name, 594 const Symbol* signature, 595 PrivateLookupMode private_mode = find_private); 596 597 // find a local method (returns NULL if not found) 598 Method* find_local_method(const Symbol* name, 599 const Symbol* signature, 600 OverpassLookupMode overpass_mode, 601 StaticLookupMode static_mode, 602 PrivateLookupMode private_mode) const; 603 604 // find a local method from given methods array (returns NULL if not found) 605 static Method* find_local_method(const Array<Method*>* methods, 606 const Symbol* name, 607 const Symbol* signature, 608 OverpassLookupMode overpass_mode, 609 StaticLookupMode static_mode, 610 PrivateLookupMode private_mode); 611 612 // find a local method index in methods or default_methods (returns -1 if not found) 613 static int find_method_index(const Array<Method*>* methods, 614 const Symbol* name, 615 const Symbol* signature, 616 OverpassLookupMode overpass_mode, 617 StaticLookupMode static_mode, 618 PrivateLookupMode private_mode); 619 620 // lookup operation (returns NULL if not found) 621 Method* uncached_lookup_method(const Symbol* name, 622 const Symbol* signature, 623 OverpassLookupMode overpass_mode, 624 PrivateLookupMode private_mode = find_private) const; 625 626 // lookup a method in all the interfaces that this class implements 627 // (returns NULL if not found) 628 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 629 630 // lookup a method in local defaults then in all interfaces 631 // (returns NULL if not found) 632 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 633 634 // Find method indices by name. If a method with the specified name is 635 // found the index to the first method is returned, and 'end' is filled in 636 // with the index of first non-name-matching method. If no method is found 637 // -1 is returned. 638 int find_method_by_name(const Symbol* name, int* end) const; 639 static int find_method_by_name(const Array<Method*>* methods, 640 const Symbol* name, int* end); 641 642 // constant pool 643 ConstantPool* constants() const { return _constants; } 644 void set_constants(ConstantPool* c) { _constants = c; } 645 646 // protection domain 647 oop protection_domain() const; 648 649 // signers 650 objArrayOop signers() const; 651 652 // host class 653 InstanceKlass* host_klass() const { 654 InstanceKlass** hk = adr_host_klass(); 655 if (hk == NULL) { 656 assert(!is_anonymous(), "Anonymous classes have host klasses"); 657 return NULL; 658 } else { 659 assert(*hk != NULL, "host klass should always be set if the address is not null"); 660 assert(is_anonymous(), "Only anonymous classes have host klasses"); 661 return *hk; 662 } 663 } 664 void set_host_klass(const InstanceKlass* host) { 665 assert(is_anonymous(), "not anonymous"); 666 const InstanceKlass** addr = (const InstanceKlass **)adr_host_klass(); 667 assert(addr != NULL, "no reversed space"); 668 if (addr != NULL) { 669 *addr = host; 670 } 671 } 672 bool has_host_klass() const { 673 return adr_host_klass() != NULL; 674 } 675 bool is_anonymous() const { 676 return (_misc_flags & _misc_is_anonymous) != 0; 677 } 678 void set_is_anonymous(bool value) { 679 if (value) { 680 _misc_flags |= _misc_is_anonymous; 681 } else { 682 _misc_flags &= ~_misc_is_anonymous; 683 } 684 } 685 686 // Oop that keeps the metadata for this class from being unloaded 687 // in places where the metadata is stored in other places, like nmethods 688 oop klass_holder() const { 689 return is_anonymous() ? java_mirror() : class_loader(); 690 } 691 692 bool is_contended() const { 693 return (_misc_flags & _misc_is_contended) != 0; 694 } 695 void set_is_contended(bool value) { 696 if (value) { 697 _misc_flags |= _misc_is_contended; 698 } else { 699 _misc_flags &= ~_misc_is_contended; 700 } 701 } 702 703 // source file name 704 Symbol* source_file_name() const { 705 return (_source_file_name_index == 0) ? 706 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index); 707 } 708 u2 source_file_name_index() const { 709 return _source_file_name_index; 710 } 711 void set_source_file_name_index(u2 sourcefile_index) { 712 _source_file_name_index = sourcefile_index; 713 } 714 715 // minor and major version numbers of class file 716 u2 minor_version() const { return _minor_version; } 717 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 718 u2 major_version() const { return _major_version; } 719 void set_major_version(u2 major_version) { _major_version = major_version; } 720 721 // source debug extension 722 const char* source_debug_extension() const { return _source_debug_extension; } 723 void set_source_debug_extension(const char* array, int length); 724 725 // symbol unloading support (refcount already added) 726 Symbol* array_name() { return _array_name; } 727 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; } 728 729 // nonstatic oop-map blocks 730 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 731 return oop_map_count * OopMapBlock::size_in_words(); 732 } 733 unsigned int nonstatic_oop_map_count() const { 734 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 735 } 736 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 737 void set_nonstatic_oop_map_size(int words) { 738 _nonstatic_oop_map_size = words; 739 } 740 741 #if INCLUDE_JVMTI 742 // Redefinition locking. Class can only be redefined by one thread at a time. 743 bool is_being_redefined() const { return _is_being_redefined; } 744 void set_is_being_redefined(bool value) { _is_being_redefined = value; } 745 746 // RedefineClasses() support for previous versions: 747 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 748 void purge_previous_version_list(); 749 750 InstanceKlass* previous_versions() const { return _previous_versions; } 751 #else 752 InstanceKlass* previous_versions() const { return NULL; } 753 #endif 754 755 InstanceKlass* get_klass_version(int version) { 756 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 757 if (ik->constants()->version() == version) { 758 return ik; 759 } 760 } 761 return NULL; 762 } 763 764 bool has_been_redefined() const { 765 return (_misc_flags & _misc_has_been_redefined) != 0; 766 } 767 void set_has_been_redefined() { 768 _misc_flags |= _misc_has_been_redefined; 769 } 770 771 bool has_passed_fingerprint_check() const { 772 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0; 773 } 774 void set_has_passed_fingerprint_check(bool b) { 775 if (b) { 776 _misc_flags |= _misc_has_passed_fingerprint_check; 777 } else { 778 _misc_flags &= ~_misc_has_passed_fingerprint_check; 779 } 780 } 781 bool supers_have_passed_fingerprint_checks(); 782 783 static bool should_store_fingerprint(bool is_anonymous); 784 bool should_store_fingerprint() const { return should_store_fingerprint(is_anonymous()); } 785 bool has_stored_fingerprint() const; 786 uint64_t get_stored_fingerprint() const; 787 void store_fingerprint(uint64_t fingerprint); 788 789 bool is_scratch_class() const { 790 return (_misc_flags & _misc_is_scratch_class) != 0; 791 } 792 793 void set_is_scratch_class() { 794 _misc_flags |= _misc_is_scratch_class; 795 } 796 797 bool has_resolved_methods() const { 798 return (_misc_flags & _misc_has_resolved_methods) != 0; 799 } 800 801 void set_has_resolved_methods() { 802 _misc_flags |= _misc_has_resolved_methods; 803 } 804 private: 805 806 void set_kind(unsigned kind) { 807 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind"); 808 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos; 809 unsigned flags = _misc_flags & ~fmask; 810 _misc_flags = (flags | (kind << _misc_kind_field_pos)); 811 } 812 813 bool is_kind(unsigned desired) const { 814 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask; 815 return kind == desired; 816 } 817 818 public: 819 820 // Other is anything that is not one of the more specialized kinds of InstanceKlass. 821 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); } 822 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); } 823 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); } 824 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); } 825 826 #if INCLUDE_JVMTI 827 828 void init_previous_versions() { 829 _previous_versions = NULL; 830 } 831 832 private: 833 static bool _has_previous_versions; 834 public: 835 static void purge_previous_versions(InstanceKlass* ik) { 836 if (ik->has_been_redefined()) { 837 ik->purge_previous_version_list(); 838 } 839 } 840 841 static bool has_previous_versions_and_reset(); 842 843 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 844 void set_cached_class_file(JvmtiCachedClassFileData *data) { 845 _cached_class_file = data; 846 } 847 JvmtiCachedClassFileData * get_cached_class_file(); 848 jint get_cached_class_file_len(); 849 unsigned char * get_cached_class_file_bytes(); 850 851 // JVMTI: Support for caching of field indices, types, and offsets 852 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 853 _jvmti_cached_class_field_map = descriptor; 854 } 855 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 856 return _jvmti_cached_class_field_map; 857 } 858 859 #if INCLUDE_CDS 860 void set_archived_class_data(JvmtiCachedClassFileData* data) { 861 _cached_class_file = data; 862 } 863 864 JvmtiCachedClassFileData * get_archived_class_data(); 865 #endif // INCLUDE_CDS 866 #else // INCLUDE_JVMTI 867 868 static void purge_previous_versions(InstanceKlass* ik) { return; }; 869 static bool has_previous_versions_and_reset() { return false; } 870 871 void set_cached_class_file(JvmtiCachedClassFileData *data) { 872 assert(data == NULL, "unexpected call with JVMTI disabled"); 873 } 874 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; } 875 876 #endif // INCLUDE_JVMTI 877 878 bool has_nonstatic_concrete_methods() const { 879 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0; 880 } 881 void set_has_nonstatic_concrete_methods(bool b) { 882 if (b) { 883 _misc_flags |= _misc_has_nonstatic_concrete_methods; 884 } else { 885 _misc_flags &= ~_misc_has_nonstatic_concrete_methods; 886 } 887 } 888 889 bool declares_nonstatic_concrete_methods() const { 890 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0; 891 } 892 void set_declares_nonstatic_concrete_methods(bool b) { 893 if (b) { 894 _misc_flags |= _misc_declares_nonstatic_concrete_methods; 895 } else { 896 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods; 897 } 898 } 899 900 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 901 inline u2 next_method_idnum(); 902 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 903 904 // generics support 905 Symbol* generic_signature() const { 906 return (_generic_signature_index == 0) ? 907 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index); 908 } 909 u2 generic_signature_index() const { 910 return _generic_signature_index; 911 } 912 void set_generic_signature_index(u2 sig_index) { 913 _generic_signature_index = sig_index; 914 } 915 916 u2 enclosing_method_data(int offset) const; 917 u2 enclosing_method_class_index() const { 918 return enclosing_method_data(enclosing_method_class_index_offset); 919 } 920 u2 enclosing_method_method_index() { 921 return enclosing_method_data(enclosing_method_method_index_offset); 922 } 923 void set_enclosing_method_indices(u2 class_index, 924 u2 method_index); 925 926 // jmethodID support 927 jmethodID get_jmethod_id(const methodHandle& method_h); 928 jmethodID get_jmethod_id_fetch_or_update(size_t idnum, 929 jmethodID new_id, jmethodID* new_jmeths, 930 jmethodID* to_dealloc_id_p, 931 jmethodID** to_dealloc_jmeths_p); 932 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 933 size_t *length_p, jmethodID* id_p); 934 void ensure_space_for_methodids(int start_offset = 0); 935 jmethodID jmethod_id_or_null(Method* method); 936 937 // annotations support 938 Annotations* annotations() const { return _annotations; } 939 void set_annotations(Annotations* anno) { _annotations = anno; } 940 941 AnnotationArray* class_annotations() const { 942 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 943 } 944 Array<AnnotationArray*>* fields_annotations() const { 945 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 946 } 947 AnnotationArray* class_type_annotations() const { 948 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 949 } 950 Array<AnnotationArray*>* fields_type_annotations() const { 951 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 952 } 953 // allocation 954 instanceOop allocate_instance(TRAPS); 955 956 // additional member function to return a handle 957 instanceHandle allocate_instance_handle(TRAPS); 958 959 objArrayOop allocate_objArray(int n, int length, TRAPS); 960 // Helper function 961 static instanceOop register_finalizer(instanceOop i, TRAPS); 962 963 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 964 // if not, throw either an Error or an Exception. 965 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 966 967 // initialization 968 void call_class_initializer(TRAPS); 969 void set_initialization_state_and_notify(ClassState state, TRAPS); 970 971 // OopMapCache support 972 OopMapCache* oop_map_cache() { return _oop_map_cache; } 973 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 974 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 975 976 // JNI identifier support (for static fields - for jni performance) 977 JNIid* jni_ids() { return _jni_ids; } 978 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 979 JNIid* jni_id_for(int offset); 980 981 // maintenance of deoptimization dependencies 982 inline DependencyContext dependencies(); 983 int mark_dependent_nmethods(KlassDepChange& changes); 984 void add_dependent_nmethod(nmethod* nm); 985 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately); 986 987 // On-stack replacement support 988 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 989 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 990 void add_osr_nmethod(nmethod* n); 991 bool remove_osr_nmethod(nmethod* n); 992 int mark_osr_nmethods(const Method* m); 993 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 994 995 #if INCLUDE_JVMTI 996 // Breakpoint support (see methods on Method* for details) 997 BreakpointInfo* breakpoints() const { return _breakpoints; }; 998 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 999 #endif 1000 1001 // support for stub routines 1002 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 1003 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;) 1004 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 1005 1006 // subclass/subinterface checks 1007 bool implements_interface(Klass* k) const; 1008 bool is_same_or_direct_interface(Klass* k) const; 1009 1010 #ifdef ASSERT 1011 // check whether this class or one of its superclasses was redefined 1012 bool has_redefined_this_or_super() const; 1013 #endif 1014 1015 // Access to the implementor of an interface. 1016 Klass* implementor() const 1017 { 1018 Klass** k = adr_implementor(); 1019 if (k == NULL) { 1020 return NULL; 1021 } else { 1022 return *k; 1023 } 1024 } 1025 1026 void set_implementor(Klass* k) { 1027 assert(is_interface(), "not interface"); 1028 Klass** addr = adr_implementor(); 1029 assert(addr != NULL, "null addr"); 1030 if (addr != NULL) { 1031 *addr = k; 1032 } 1033 } 1034 1035 int nof_implementors() const { 1036 Klass* k = implementor(); 1037 if (k == NULL) { 1038 return 0; 1039 } else if (k != this) { 1040 return 1; 1041 } else { 1042 return 2; 1043 } 1044 } 1045 1046 void add_implementor(Klass* k); // k is a new class that implements this interface 1047 void init_implementor(); // initialize 1048 1049 // link this class into the implementors list of every interface it implements 1050 void process_interfaces(Thread *thread); 1051 1052 // virtual operations from Klass 1053 bool is_leaf_class() const { return _subklass == NULL; } 1054 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 1055 Array<InstanceKlass*>* transitive_interfaces); 1056 bool compute_is_subtype_of(Klass* k); 1057 bool can_be_primary_super_slow() const; 1058 int oop_size(oop obj) const { return size_helper(); } 1059 // slow because it's a virtual call and used for verifying the layout_helper. 1060 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 1061 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 1062 1063 // Iterators 1064 void do_local_static_fields(FieldClosure* cl); 1065 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 1066 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 1067 1068 void methods_do(void f(Method* method)); 1069 void array_klasses_do(void f(Klass* k)); 1070 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 1071 bool super_types_do(SuperTypeClosure* blk); 1072 1073 static InstanceKlass* cast(Klass* k) { 1074 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 1075 } 1076 1077 static const InstanceKlass* cast(const Klass* k) { 1078 assert(k != NULL, "k should not be null"); 1079 assert(k->is_instance_klass(), "cast to InstanceKlass"); 1080 return static_cast<const InstanceKlass*>(k); 1081 } 1082 1083 virtual InstanceKlass* java_super() const { 1084 return (super() == NULL) ? NULL : cast(super()); 1085 } 1086 1087 // Sizing (in words) 1088 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 1089 1090 static int size(int vtable_length, int itable_length, 1091 int nonstatic_oop_map_size, 1092 bool is_interface, bool is_anonymous, bool has_stored_fingerprint) { 1093 return align_metadata_size(header_size() + 1094 vtable_length + 1095 itable_length + 1096 nonstatic_oop_map_size + 1097 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) + 1098 (is_anonymous ? (int)sizeof(Klass*)/wordSize : 0) + 1099 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0)); 1100 } 1101 int size() const { return size(vtable_length(), 1102 itable_length(), 1103 nonstatic_oop_map_size(), 1104 is_interface(), 1105 is_anonymous(), 1106 has_stored_fingerprint()); 1107 } 1108 #if INCLUDE_SERVICES 1109 virtual void collect_statistics(KlassSizeStats *sz) const; 1110 #endif 1111 1112 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); } 1113 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 1114 1115 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 1116 1117 oop static_field_base_raw() { return java_mirror(); } 1118 1119 OopMapBlock* start_of_nonstatic_oop_maps() const { 1120 return (OopMapBlock*)(start_of_itable() + itable_length()); 1121 } 1122 1123 Klass** end_of_nonstatic_oop_maps() const { 1124 return (Klass**)(start_of_nonstatic_oop_maps() + 1125 nonstatic_oop_map_count()); 1126 } 1127 1128 Klass** adr_implementor() const { 1129 if (is_interface()) { 1130 return (Klass**)end_of_nonstatic_oop_maps(); 1131 } else { 1132 return NULL; 1133 } 1134 }; 1135 1136 InstanceKlass** adr_host_klass() const { 1137 if (is_anonymous()) { 1138 InstanceKlass** adr_impl = (InstanceKlass **)adr_implementor(); 1139 if (adr_impl != NULL) { 1140 return adr_impl + 1; 1141 } else { 1142 return (InstanceKlass **)end_of_nonstatic_oop_maps(); 1143 } 1144 } else { 1145 return NULL; 1146 } 1147 } 1148 1149 address adr_fingerprint() const { 1150 if (has_stored_fingerprint()) { 1151 InstanceKlass** adr_host = adr_host_klass(); 1152 if (adr_host != NULL) { 1153 return (address)(adr_host + 1); 1154 } 1155 1156 Klass** adr_impl = adr_implementor(); 1157 if (adr_impl != NULL) { 1158 return (address)(adr_impl + 1); 1159 } 1160 1161 return (address)end_of_nonstatic_oop_maps(); 1162 } else { 1163 return NULL; 1164 } 1165 } 1166 1167 // Use this to return the size of an instance in heap words: 1168 int size_helper() const { 1169 return layout_helper_to_size_helper(layout_helper()); 1170 } 1171 1172 // This bit is initialized in classFileParser.cpp. 1173 // It is false under any of the following conditions: 1174 // - the class is abstract (including any interface) 1175 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1176 // - the class size is larger than FastAllocateSizeLimit 1177 // - the class is java/lang/Class, which cannot be allocated directly 1178 bool can_be_fastpath_allocated() const { 1179 return !layout_helper_needs_slow_path(layout_helper()); 1180 } 1181 1182 // Java itable 1183 klassItable itable() const; // return klassItable wrapper 1184 Method* method_at_itable(Klass* holder, int index, TRAPS); 1185 1186 #if INCLUDE_JVMTI 1187 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed); 1188 #endif // INCLUDE_JVMTI 1189 1190 void clean_weak_instanceklass_links(); 1191 private: 1192 void clean_implementors_list(); 1193 void clean_method_data(); 1194 1195 public: 1196 // Explicit metaspace deallocation of fields 1197 // For RedefineClasses and class file parsing errors, we need to deallocate 1198 // instanceKlasses and the metadata they point to. 1199 void deallocate_contents(ClassLoaderData* loader_data); 1200 static void deallocate_methods(ClassLoaderData* loader_data, 1201 Array<Method*>* methods); 1202 void static deallocate_interfaces(ClassLoaderData* loader_data, 1203 const Klass* super_klass, 1204 Array<InstanceKlass*>* local_interfaces, 1205 Array<InstanceKlass*>* transitive_interfaces); 1206 1207 // The constant pool is on stack if any of the methods are executing or 1208 // referenced by handles. 1209 bool on_stack() const { return _constants->on_stack(); } 1210 1211 // callbacks for actions during class unloading 1212 static void notify_unload_class(InstanceKlass* ik); 1213 static void release_C_heap_structures(InstanceKlass* ik); 1214 1215 // Naming 1216 const char* signature_name() const; 1217 static Symbol* package_from_name(const Symbol* name, TRAPS); 1218 1219 // GC specific object visitors 1220 // 1221 #if INCLUDE_PARALLELGC 1222 // Parallel Scavenge 1223 void oop_ps_push_contents( oop obj, PSPromotionManager* pm); 1224 // Parallel Compact 1225 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm); 1226 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm); 1227 #endif 1228 1229 // Oop fields (and metadata) iterators 1230 // 1231 // The InstanceKlass iterators also visits the Object's klass. 1232 1233 // Forward iteration 1234 public: 1235 // Iterate over all oop fields in the oop maps. 1236 template <typename T, class OopClosureType> 1237 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1238 1239 // Iterate over all oop fields and metadata. 1240 template <typename T, class OopClosureType> 1241 inline int oop_oop_iterate(oop obj, OopClosureType* closure); 1242 1243 // Iterate over all oop fields in one oop map. 1244 template <typename T, class OopClosureType> 1245 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1246 1247 1248 // Reverse iteration 1249 // Iterate over all oop fields and metadata. 1250 template <typename T, class OopClosureType> 1251 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1252 1253 private: 1254 // Iterate over all oop fields in the oop maps. 1255 template <typename T, class OopClosureType> 1256 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1257 1258 // Iterate over all oop fields in one oop map. 1259 template <typename T, class OopClosureType> 1260 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1261 1262 1263 // Bounded range iteration 1264 public: 1265 // Iterate over all oop fields in the oop maps. 1266 template <typename T, class OopClosureType> 1267 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1268 1269 // Iterate over all oop fields and metadata. 1270 template <typename T, class OopClosureType> 1271 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1272 1273 private: 1274 // Iterate over all oop fields in one oop map. 1275 template <typename T, class OopClosureType> 1276 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1277 1278 1279 public: 1280 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1281 1282 public: 1283 void set_in_error_state() { 1284 assert(DumpSharedSpaces, "only call this when dumping archive"); 1285 _init_state = initialization_error; 1286 } 1287 bool check_sharing_error_state(); 1288 1289 private: 1290 // initialization state 1291 #ifdef ASSERT 1292 void set_init_state(ClassState state); 1293 #else 1294 void set_init_state(ClassState state) { _init_state = (u1)state; } 1295 #endif 1296 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1297 void set_init_thread(Thread *thread) { _init_thread = thread; } 1298 1299 // The RedefineClasses() API can cause new method idnums to be needed 1300 // which will cause the caches to grow. Safety requires different 1301 // cache management logic if the caches can grow instead of just 1302 // going from NULL to non-NULL. 1303 bool idnum_can_increment() const { return has_been_redefined(); } 1304 inline jmethodID* methods_jmethod_ids_acquire() const; 1305 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1306 1307 // Lock during initialization 1308 public: 1309 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1310 // Must be one per class and it has to be a VM internal object so java code 1311 // cannot lock it (like the mirror). 1312 // It has to be an object not a Mutex because it's held through java calls. 1313 oop init_lock() const; 1314 private: 1315 void fence_and_clear_init_lock(); 1316 1317 bool link_class_impl (bool throw_verifyerror, TRAPS); 1318 bool verify_code (bool throw_verifyerror, TRAPS); 1319 void initialize_impl (TRAPS); 1320 void initialize_super_interfaces (TRAPS); 1321 void eager_initialize_impl (); 1322 /* jni_id_for_impl for jfieldID only */ 1323 JNIid* jni_id_for_impl (int offset); 1324 1325 // Returns the array class for the n'th dimension 1326 Klass* array_klass_impl(bool or_null, int n, TRAPS); 1327 1328 // Returns the array class with this class as element type 1329 Klass* array_klass_impl(bool or_null, TRAPS); 1330 1331 // find a local method (returns NULL if not found) 1332 Method* find_method_impl(const Symbol* name, 1333 const Symbol* signature, 1334 OverpassLookupMode overpass_mode, 1335 StaticLookupMode static_mode, 1336 PrivateLookupMode private_mode) const; 1337 1338 static Method* find_method_impl(const Array<Method*>* methods, 1339 const Symbol* name, 1340 const Symbol* signature, 1341 OverpassLookupMode overpass_mode, 1342 StaticLookupMode static_mode, 1343 PrivateLookupMode private_mode); 1344 1345 // Free CHeap allocated fields. 1346 void release_C_heap_structures(); 1347 1348 #if INCLUDE_JVMTI 1349 // RedefineClasses support 1350 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1351 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1352 #endif 1353 public: 1354 // CDS support - remove and restore oops from metadata. Oops are not shared. 1355 virtual void remove_unshareable_info(); 1356 virtual void remove_java_mirror(); 1357 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 1358 1359 // jvm support 1360 jint compute_modifier_flags(TRAPS) const; 1361 1362 public: 1363 // JVMTI support 1364 jint jvmti_class_status() const; 1365 1366 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 1367 1368 public: 1369 // Printing 1370 #ifndef PRODUCT 1371 void print_on(outputStream* st) const; 1372 #endif 1373 void print_value_on(outputStream* st) const; 1374 1375 void oop_print_value_on(oop obj, outputStream* st); 1376 1377 #ifndef PRODUCT 1378 void oop_print_on (oop obj, outputStream* st); 1379 1380 void print_dependent_nmethods(bool verbose = false); 1381 bool is_dependent_nmethod(nmethod* nm); 1382 #endif 1383 1384 const char* internal_name() const; 1385 1386 // Verification 1387 void verify_on(outputStream* st); 1388 1389 void oop_verify_on(oop obj, outputStream* st); 1390 1391 // Logging 1392 void print_class_load_logging(ClassLoaderData* loader_data, 1393 const char* module_name, 1394 const ClassFileStream* cfs) const; 1395 }; 1396 1397 // for adding methods 1398 // UNSET_IDNUM return means no more ids available 1399 inline u2 InstanceKlass::next_method_idnum() { 1400 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1401 return ConstMethod::UNSET_IDNUM; // no more ids available 1402 } else { 1403 return _idnum_allocated_count++; 1404 } 1405 } 1406 1407 1408 /* JNIid class for jfieldIDs only */ 1409 class JNIid: public CHeapObj<mtClass> { 1410 friend class VMStructs; 1411 private: 1412 Klass* _holder; 1413 JNIid* _next; 1414 int _offset; 1415 #ifdef ASSERT 1416 bool _is_static_field_id; 1417 #endif 1418 1419 public: 1420 // Accessors 1421 Klass* holder() const { return _holder; } 1422 int offset() const { return _offset; } 1423 JNIid* next() { return _next; } 1424 // Constructor 1425 JNIid(Klass* holder, int offset, JNIid* next); 1426 // Identifier lookup 1427 JNIid* find(int offset); 1428 1429 bool find_local_field(fieldDescriptor* fd) { 1430 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1431 } 1432 1433 static void deallocate(JNIid* id); 1434 // Debugging 1435 #ifdef ASSERT 1436 bool is_static_field_id() const { return _is_static_field_id; } 1437 void set_is_static_field_id() { _is_static_field_id = true; } 1438 #endif 1439 void verify(Klass* holder); 1440 }; 1441 1442 // An iterator that's used to access the inner classes indices in the 1443 // InstanceKlass::_inner_classes array. 1444 class InnerClassesIterator : public StackObj { 1445 private: 1446 Array<jushort>* _inner_classes; 1447 int _length; 1448 int _idx; 1449 public: 1450 1451 InnerClassesIterator(const InstanceKlass* k) { 1452 _inner_classes = k->inner_classes(); 1453 if (k->inner_classes() != NULL) { 1454 _length = _inner_classes->length(); 1455 // The inner class array's length should be the multiple of 1456 // inner_class_next_offset if it only contains the InnerClasses 1457 // attribute data, or it should be 1458 // n*inner_class_next_offset+enclosing_method_attribute_size 1459 // if it also contains the EnclosingMethod data. 1460 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1461 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1462 "just checking"); 1463 // Remove the enclosing_method portion if exists. 1464 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1465 _length -= InstanceKlass::enclosing_method_attribute_size; 1466 } 1467 } else { 1468 _length = 0; 1469 } 1470 _idx = 0; 1471 } 1472 1473 int length() const { 1474 return _length; 1475 } 1476 1477 void next() { 1478 _idx += InstanceKlass::inner_class_next_offset; 1479 } 1480 1481 bool done() const { 1482 return (_idx >= _length); 1483 } 1484 1485 u2 inner_class_info_index() const { 1486 return _inner_classes->at( 1487 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1488 } 1489 1490 void set_inner_class_info_index(u2 index) { 1491 _inner_classes->at_put( 1492 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1493 } 1494 1495 u2 outer_class_info_index() const { 1496 return _inner_classes->at( 1497 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1498 } 1499 1500 void set_outer_class_info_index(u2 index) { 1501 _inner_classes->at_put( 1502 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1503 } 1504 1505 u2 inner_name_index() const { 1506 return _inner_classes->at( 1507 _idx + InstanceKlass::inner_class_inner_name_offset); 1508 } 1509 1510 void set_inner_name_index(u2 index) { 1511 _inner_classes->at_put( 1512 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1513 } 1514 1515 u2 inner_access_flags() const { 1516 return _inner_classes->at( 1517 _idx + InstanceKlass::inner_class_access_flags_offset); 1518 } 1519 }; 1520 1521 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP