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 // Interface (Klass*s) this class declares locally to implement. 283 Array<Klass*>* _local_interfaces; 284 // Interface (Klass*s) this class implements transitively. 285 Array<Klass*>* _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<Klass*>* local_interfaces() const { return _local_interfaces; } 419 void set_local_interfaces(Array<Klass*>* a) { 420 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 421 _local_interfaces = a; } 422 423 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; } 424 void set_transitive_interfaces(Array<Klass*>* 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 static bool has_previous_versions() { return _has_previous_versions; } 843 844 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 845 void set_cached_class_file(JvmtiCachedClassFileData *data) { 846 _cached_class_file = data; 847 } 848 JvmtiCachedClassFileData * get_cached_class_file(); 849 jint get_cached_class_file_len(); 850 unsigned char * get_cached_class_file_bytes(); 851 852 // JVMTI: Support for caching of field indices, types, and offsets 853 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 854 _jvmti_cached_class_field_map = descriptor; 855 } 856 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 857 return _jvmti_cached_class_field_map; 858 } 859 860 #if INCLUDE_CDS 861 void set_archived_class_data(JvmtiCachedClassFileData* data) { 862 _cached_class_file = data; 863 } 864 865 JvmtiCachedClassFileData * get_archived_class_data(); 866 #endif // INCLUDE_CDS 867 #else // INCLUDE_JVMTI 868 869 static void purge_previous_versions(InstanceKlass* ik) { return; }; 870 static bool has_previous_versions_and_reset() { return false; } 871 872 void set_cached_class_file(JvmtiCachedClassFileData *data) { 873 assert(data == NULL, "unexpected call with JVMTI disabled"); 874 } 875 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; } 876 877 #endif // INCLUDE_JVMTI 878 879 bool has_nonstatic_concrete_methods() const { 880 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0; 881 } 882 void set_has_nonstatic_concrete_methods(bool b) { 883 if (b) { 884 _misc_flags |= _misc_has_nonstatic_concrete_methods; 885 } else { 886 _misc_flags &= ~_misc_has_nonstatic_concrete_methods; 887 } 888 } 889 890 bool declares_nonstatic_concrete_methods() const { 891 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0; 892 } 893 void set_declares_nonstatic_concrete_methods(bool b) { 894 if (b) { 895 _misc_flags |= _misc_declares_nonstatic_concrete_methods; 896 } else { 897 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods; 898 } 899 } 900 901 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 902 inline u2 next_method_idnum(); 903 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 904 905 // generics support 906 Symbol* generic_signature() const { 907 return (_generic_signature_index == 0) ? 908 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index); 909 } 910 u2 generic_signature_index() const { 911 return _generic_signature_index; 912 } 913 void set_generic_signature_index(u2 sig_index) { 914 _generic_signature_index = sig_index; 915 } 916 917 u2 enclosing_method_data(int offset) const; 918 u2 enclosing_method_class_index() const { 919 return enclosing_method_data(enclosing_method_class_index_offset); 920 } 921 u2 enclosing_method_method_index() { 922 return enclosing_method_data(enclosing_method_method_index_offset); 923 } 924 void set_enclosing_method_indices(u2 class_index, 925 u2 method_index); 926 927 // jmethodID support 928 jmethodID get_jmethod_id(const methodHandle& method_h); 929 jmethodID get_jmethod_id_fetch_or_update(size_t idnum, 930 jmethodID new_id, jmethodID* new_jmeths, 931 jmethodID* to_dealloc_id_p, 932 jmethodID** to_dealloc_jmeths_p); 933 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 934 size_t *length_p, jmethodID* id_p); 935 void ensure_space_for_methodids(int start_offset = 0); 936 jmethodID jmethod_id_or_null(Method* method); 937 938 // annotations support 939 Annotations* annotations() const { return _annotations; } 940 void set_annotations(Annotations* anno) { _annotations = anno; } 941 942 AnnotationArray* class_annotations() const { 943 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 944 } 945 Array<AnnotationArray*>* fields_annotations() const { 946 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 947 } 948 AnnotationArray* class_type_annotations() const { 949 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 950 } 951 Array<AnnotationArray*>* fields_type_annotations() const { 952 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 953 } 954 // allocation 955 instanceOop allocate_instance(TRAPS); 956 957 // additional member function to return a handle 958 instanceHandle allocate_instance_handle(TRAPS); 959 960 objArrayOop allocate_objArray(int n, int length, TRAPS); 961 // Helper function 962 static instanceOop register_finalizer(instanceOop i, TRAPS); 963 964 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 965 // if not, throw either an Error or an Exception. 966 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 967 968 // initialization 969 void call_class_initializer(TRAPS); 970 void set_initialization_state_and_notify(ClassState state, TRAPS); 971 972 // OopMapCache support 973 OopMapCache* oop_map_cache() { return _oop_map_cache; } 974 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 975 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 976 977 // JNI identifier support (for static fields - for jni performance) 978 JNIid* jni_ids() { return _jni_ids; } 979 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 980 JNIid* jni_id_for(int offset); 981 982 // maintenance of deoptimization dependencies 983 inline DependencyContext dependencies(); 984 int mark_dependent_nmethods(KlassDepChange& changes); 985 void add_dependent_nmethod(nmethod* nm); 986 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately); 987 988 // On-stack replacement support 989 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 990 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 991 void add_osr_nmethod(nmethod* n); 992 bool remove_osr_nmethod(nmethod* n); 993 int mark_osr_nmethods(const Method* m); 994 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 995 996 #if INCLUDE_JVMTI 997 // Breakpoint support (see methods on Method* for details) 998 BreakpointInfo* breakpoints() const { return _breakpoints; }; 999 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 1000 #endif 1001 1002 // support for stub routines 1003 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 1004 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;) 1005 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 1006 1007 // subclass/subinterface checks 1008 bool implements_interface(Klass* k) const; 1009 bool is_same_or_direct_interface(Klass* k) const; 1010 1011 #ifdef ASSERT 1012 // check whether this class or one of its superclasses was redefined 1013 bool has_redefined_this_or_super() const; 1014 #endif 1015 1016 // Access to the implementor of an interface. 1017 Klass* implementor() const 1018 { 1019 Klass** k = adr_implementor(); 1020 if (k == NULL) { 1021 return NULL; 1022 } else { 1023 return *k; 1024 } 1025 } 1026 1027 void set_implementor(Klass* k) { 1028 assert(is_interface(), "not interface"); 1029 Klass** addr = adr_implementor(); 1030 assert(addr != NULL, "null addr"); 1031 if (addr != NULL) { 1032 *addr = k; 1033 } 1034 } 1035 1036 int nof_implementors() const { 1037 Klass* k = implementor(); 1038 if (k == NULL) { 1039 return 0; 1040 } else if (k != this) { 1041 return 1; 1042 } else { 1043 return 2; 1044 } 1045 } 1046 1047 void add_implementor(Klass* k); // k is a new class that implements this interface 1048 void init_implementor(); // initialize 1049 1050 // link this class into the implementors list of every interface it implements 1051 void process_interfaces(Thread *thread); 1052 1053 // virtual operations from Klass 1054 bool is_leaf_class() const { return _subklass == NULL; } 1055 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 1056 Array<Klass*>* transitive_interfaces); 1057 bool compute_is_subtype_of(Klass* k); 1058 bool can_be_primary_super_slow() const; 1059 int oop_size(oop obj) const { return size_helper(); } 1060 // slow because it's a virtual call and used for verifying the layout_helper. 1061 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 1062 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 1063 1064 // Iterators 1065 void do_local_static_fields(FieldClosure* cl); 1066 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 1067 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 1068 1069 void methods_do(void f(Method* method)); 1070 void array_klasses_do(void f(Klass* k)); 1071 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 1072 bool super_types_do(SuperTypeClosure* blk); 1073 1074 static InstanceKlass* cast(Klass* k) { 1075 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 1076 } 1077 1078 static const InstanceKlass* cast(const Klass* k) { 1079 assert(k != NULL, "k should not be null"); 1080 assert(k->is_instance_klass(), "cast to InstanceKlass"); 1081 return static_cast<const InstanceKlass*>(k); 1082 } 1083 1084 InstanceKlass* java_super() const { 1085 return (super() == NULL) ? NULL : cast(super()); 1086 } 1087 1088 // Sizing (in words) 1089 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 1090 1091 static int size(int vtable_length, int itable_length, 1092 int nonstatic_oop_map_size, 1093 bool is_interface, bool is_anonymous, bool has_stored_fingerprint) { 1094 return align_metadata_size(header_size() + 1095 vtable_length + 1096 itable_length + 1097 nonstatic_oop_map_size + 1098 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) + 1099 (is_anonymous ? (int)sizeof(Klass*)/wordSize : 0) + 1100 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0)); 1101 } 1102 int size() const { return size(vtable_length(), 1103 itable_length(), 1104 nonstatic_oop_map_size(), 1105 is_interface(), 1106 is_anonymous(), 1107 has_stored_fingerprint()); 1108 } 1109 #if INCLUDE_SERVICES 1110 virtual void collect_statistics(KlassSizeStats *sz) const; 1111 #endif 1112 1113 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); } 1114 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 1115 1116 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 1117 1118 oop static_field_base_raw() { return java_mirror(); } 1119 1120 OopMapBlock* start_of_nonstatic_oop_maps() const { 1121 return (OopMapBlock*)(start_of_itable() + itable_length()); 1122 } 1123 1124 Klass** end_of_nonstatic_oop_maps() const { 1125 return (Klass**)(start_of_nonstatic_oop_maps() + 1126 nonstatic_oop_map_count()); 1127 } 1128 1129 Klass** adr_implementor() const { 1130 if (is_interface()) { 1131 return (Klass**)end_of_nonstatic_oop_maps(); 1132 } else { 1133 return NULL; 1134 } 1135 }; 1136 1137 InstanceKlass** adr_host_klass() const { 1138 if (is_anonymous()) { 1139 InstanceKlass** adr_impl = (InstanceKlass **)adr_implementor(); 1140 if (adr_impl != NULL) { 1141 return adr_impl + 1; 1142 } else { 1143 return (InstanceKlass **)end_of_nonstatic_oop_maps(); 1144 } 1145 } else { 1146 return NULL; 1147 } 1148 } 1149 1150 address adr_fingerprint() const { 1151 if (has_stored_fingerprint()) { 1152 InstanceKlass** adr_host = adr_host_klass(); 1153 if (adr_host != NULL) { 1154 return (address)(adr_host + 1); 1155 } 1156 1157 Klass** adr_impl = adr_implementor(); 1158 if (adr_impl != NULL) { 1159 return (address)(adr_impl + 1); 1160 } 1161 1162 return (address)end_of_nonstatic_oop_maps(); 1163 } else { 1164 return NULL; 1165 } 1166 } 1167 1168 // Use this to return the size of an instance in heap words: 1169 int size_helper() const { 1170 return layout_helper_to_size_helper(layout_helper()); 1171 } 1172 1173 // This bit is initialized in classFileParser.cpp. 1174 // It is false under any of the following conditions: 1175 // - the class is abstract (including any interface) 1176 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1177 // - the class size is larger than FastAllocateSizeLimit 1178 // - the class is java/lang/Class, which cannot be allocated directly 1179 bool can_be_fastpath_allocated() const { 1180 return !layout_helper_needs_slow_path(layout_helper()); 1181 } 1182 1183 // Java itable 1184 klassItable itable() const; // return klassItable wrapper 1185 Method* method_at_itable(Klass* holder, int index, TRAPS); 1186 1187 #if INCLUDE_JVMTI 1188 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed); 1189 #endif // INCLUDE_JVMTI 1190 1191 void clean_weak_instanceklass_links(); 1192 private: 1193 void clean_implementors_list(); 1194 void clean_method_data(); 1195 1196 public: 1197 // Explicit metaspace deallocation of fields 1198 // For RedefineClasses and class file parsing errors, we need to deallocate 1199 // instanceKlasses and the metadata they point to. 1200 void deallocate_contents(ClassLoaderData* loader_data); 1201 static void deallocate_methods(ClassLoaderData* loader_data, 1202 Array<Method*>* methods); 1203 void static deallocate_interfaces(ClassLoaderData* loader_data, 1204 const Klass* super_klass, 1205 Array<Klass*>* local_interfaces, 1206 Array<Klass*>* transitive_interfaces); 1207 1208 // The constant pool is on stack if any of the methods are executing or 1209 // referenced by handles. 1210 bool on_stack() const { return _constants->on_stack(); } 1211 1212 // callbacks for actions during class unloading 1213 static void notify_unload_class(InstanceKlass* ik); 1214 static void release_C_heap_structures(InstanceKlass* ik); 1215 1216 // Naming 1217 const char* signature_name() const; 1218 static Symbol* package_from_name(const Symbol* name, TRAPS); 1219 1220 // GC specific object visitors 1221 // 1222 #if INCLUDE_PARALLELGC 1223 // Parallel Scavenge 1224 void oop_ps_push_contents( oop obj, PSPromotionManager* pm); 1225 // Parallel Compact 1226 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm); 1227 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm); 1228 #endif 1229 1230 // Oop fields (and metadata) iterators 1231 // 1232 // The InstanceKlass iterators also visits the Object's klass. 1233 1234 // Forward iteration 1235 public: 1236 // Iterate over all oop fields in the oop maps. 1237 template <typename T, class OopClosureType> 1238 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1239 1240 // Iterate over all oop fields and metadata. 1241 template <typename T, class OopClosureType> 1242 inline int oop_oop_iterate(oop obj, OopClosureType* closure); 1243 1244 // Iterate over all oop fields in one oop map. 1245 template <typename T, class OopClosureType> 1246 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1247 1248 1249 // Reverse iteration 1250 // Iterate over all oop fields and metadata. 1251 template <typename T, class OopClosureType> 1252 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1253 1254 private: 1255 // Iterate over all oop fields in the oop maps. 1256 template <typename T, class OopClosureType> 1257 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1258 1259 // Iterate over all oop fields in one oop map. 1260 template <typename T, class OopClosureType> 1261 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1262 1263 1264 // Bounded range iteration 1265 public: 1266 // Iterate over all oop fields in the oop maps. 1267 template <typename T, class OopClosureType> 1268 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1269 1270 // Iterate over all oop fields and metadata. 1271 template <typename T, class OopClosureType> 1272 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1273 1274 private: 1275 // Iterate over all oop fields in one oop map. 1276 template <typename T, class OopClosureType> 1277 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1278 1279 1280 public: 1281 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1282 1283 public: 1284 void set_in_error_state() { 1285 assert(DumpSharedSpaces, "only call this when dumping archive"); 1286 _init_state = initialization_error; 1287 } 1288 bool check_sharing_error_state(); 1289 1290 private: 1291 // initialization state 1292 #ifdef ASSERT 1293 void set_init_state(ClassState state); 1294 #else 1295 void set_init_state(ClassState state) { _init_state = (u1)state; } 1296 #endif 1297 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1298 void set_init_thread(Thread *thread) { _init_thread = thread; } 1299 1300 // The RedefineClasses() API can cause new method idnums to be needed 1301 // which will cause the caches to grow. Safety requires different 1302 // cache management logic if the caches can grow instead of just 1303 // going from NULL to non-NULL. 1304 bool idnum_can_increment() const { return has_been_redefined(); } 1305 inline jmethodID* methods_jmethod_ids_acquire() const; 1306 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1307 1308 // Lock during initialization 1309 public: 1310 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1311 // Must be one per class and it has to be a VM internal object so java code 1312 // cannot lock it (like the mirror). 1313 // It has to be an object not a Mutex because it's held through java calls. 1314 oop init_lock() const; 1315 private: 1316 void fence_and_clear_init_lock(); 1317 1318 bool link_class_impl (bool throw_verifyerror, TRAPS); 1319 bool verify_code (bool throw_verifyerror, TRAPS); 1320 void initialize_impl (TRAPS); 1321 void initialize_super_interfaces (TRAPS); 1322 void eager_initialize_impl (); 1323 /* jni_id_for_impl for jfieldID only */ 1324 JNIid* jni_id_for_impl (int offset); 1325 1326 // Returns the array class for the n'th dimension 1327 Klass* array_klass_impl(bool or_null, int n, TRAPS); 1328 1329 // Returns the array class with this class as element type 1330 Klass* array_klass_impl(bool or_null, TRAPS); 1331 1332 // find a local method (returns NULL if not found) 1333 Method* find_method_impl(const Symbol* name, 1334 const Symbol* signature, 1335 OverpassLookupMode overpass_mode, 1336 StaticLookupMode static_mode, 1337 PrivateLookupMode private_mode) const; 1338 1339 static Method* find_method_impl(const Array<Method*>* methods, 1340 const Symbol* name, 1341 const Symbol* signature, 1342 OverpassLookupMode overpass_mode, 1343 StaticLookupMode static_mode, 1344 PrivateLookupMode private_mode); 1345 1346 // Free CHeap allocated fields. 1347 void release_C_heap_structures(); 1348 1349 #if INCLUDE_JVMTI 1350 // RedefineClasses support 1351 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1352 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1353 #endif 1354 public: 1355 // CDS support - remove and restore oops from metadata. Oops are not shared. 1356 virtual void remove_unshareable_info(); 1357 virtual void remove_java_mirror(); 1358 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 1359 1360 // jvm support 1361 jint compute_modifier_flags(TRAPS) const; 1362 1363 public: 1364 // JVMTI support 1365 jint jvmti_class_status() const; 1366 1367 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 1368 1369 public: 1370 // Printing 1371 #ifndef PRODUCT 1372 void print_on(outputStream* st) const; 1373 #endif 1374 void print_value_on(outputStream* st) const; 1375 1376 void oop_print_value_on(oop obj, outputStream* st); 1377 1378 #ifndef PRODUCT 1379 void oop_print_on (oop obj, outputStream* st); 1380 1381 void print_dependent_nmethods(bool verbose = false); 1382 bool is_dependent_nmethod(nmethod* nm); 1383 #endif 1384 1385 const char* internal_name() const; 1386 1387 // Verification 1388 void verify_on(outputStream* st); 1389 1390 void oop_verify_on(oop obj, outputStream* st); 1391 1392 // Logging 1393 void print_class_load_logging(ClassLoaderData* loader_data, 1394 const char* module_name, 1395 const ClassFileStream* cfs) const; 1396 }; 1397 1398 // for adding methods 1399 // UNSET_IDNUM return means no more ids available 1400 inline u2 InstanceKlass::next_method_idnum() { 1401 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1402 return ConstMethod::UNSET_IDNUM; // no more ids available 1403 } else { 1404 return _idnum_allocated_count++; 1405 } 1406 } 1407 1408 1409 /* JNIid class for jfieldIDs only */ 1410 class JNIid: public CHeapObj<mtClass> { 1411 friend class VMStructs; 1412 private: 1413 Klass* _holder; 1414 JNIid* _next; 1415 int _offset; 1416 #ifdef ASSERT 1417 bool _is_static_field_id; 1418 #endif 1419 1420 public: 1421 // Accessors 1422 Klass* holder() const { return _holder; } 1423 int offset() const { return _offset; } 1424 JNIid* next() { return _next; } 1425 // Constructor 1426 JNIid(Klass* holder, int offset, JNIid* next); 1427 // Identifier lookup 1428 JNIid* find(int offset); 1429 1430 bool find_local_field(fieldDescriptor* fd) { 1431 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1432 } 1433 1434 static void deallocate(JNIid* id); 1435 // Debugging 1436 #ifdef ASSERT 1437 bool is_static_field_id() const { return _is_static_field_id; } 1438 void set_is_static_field_id() { _is_static_field_id = true; } 1439 #endif 1440 void verify(Klass* holder); 1441 }; 1442 1443 // An iterator that's used to access the inner classes indices in the 1444 // InstanceKlass::_inner_classes array. 1445 class InnerClassesIterator : public StackObj { 1446 private: 1447 Array<jushort>* _inner_classes; 1448 int _length; 1449 int _idx; 1450 public: 1451 1452 InnerClassesIterator(const InstanceKlass* k) { 1453 _inner_classes = k->inner_classes(); 1454 if (k->inner_classes() != NULL) { 1455 _length = _inner_classes->length(); 1456 // The inner class array's length should be the multiple of 1457 // inner_class_next_offset if it only contains the InnerClasses 1458 // attribute data, or it should be 1459 // n*inner_class_next_offset+enclosing_method_attribute_size 1460 // if it also contains the EnclosingMethod data. 1461 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1462 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1463 "just checking"); 1464 // Remove the enclosing_method portion if exists. 1465 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1466 _length -= InstanceKlass::enclosing_method_attribute_size; 1467 } 1468 } else { 1469 _length = 0; 1470 } 1471 _idx = 0; 1472 } 1473 1474 int length() const { 1475 return _length; 1476 } 1477 1478 void next() { 1479 _idx += InstanceKlass::inner_class_next_offset; 1480 } 1481 1482 bool done() const { 1483 return (_idx >= _length); 1484 } 1485 1486 u2 inner_class_info_index() const { 1487 return _inner_classes->at( 1488 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1489 } 1490 1491 void set_inner_class_info_index(u2 index) { 1492 _inner_classes->at_put( 1493 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1494 } 1495 1496 u2 outer_class_info_index() const { 1497 return _inner_classes->at( 1498 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1499 } 1500 1501 void set_outer_class_info_index(u2 index) { 1502 _inner_classes->at_put( 1503 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1504 } 1505 1506 u2 inner_name_index() const { 1507 return _inner_classes->at( 1508 _idx + InstanceKlass::inner_class_inner_name_offset); 1509 } 1510 1511 void set_inner_name_index(u2 index) { 1512 _inner_classes->at_put( 1513 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1514 } 1515 1516 u2 inner_access_flags() const { 1517 return _inner_classes->at( 1518 _idx + InstanceKlass::inner_class_access_flags_offset); 1519 } 1520 }; 1521 1522 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP