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 unsafe_anonymous_host klass] only exist for an unsafe 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_unsafe_anonymous = 1 << 5, // has embedded _unsafe_anonymous_host 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 unsafe_anonymous_host klass follows here 319 // The embedded host klass only exists in an unsafe 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 unsafe 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 // initialization state 511 bool is_loaded() const { return _init_state >= loaded; } 512 bool is_linked() const { return _init_state >= linked; } 513 bool is_initialized() const { return _init_state == fully_initialized; } 514 bool is_not_initialized() const { return _init_state < being_initialized; } 515 bool is_being_initialized() const { return _init_state == being_initialized; } 516 bool is_in_error_state() const { return _init_state == initialization_error; } 517 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 518 ClassState init_state() { return (ClassState)_init_state; } 519 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 520 521 // defineClass specified verification 522 bool should_verify_class() const { 523 return (_misc_flags & _misc_should_verify_class) != 0; 524 } 525 void set_should_verify_class(bool value) { 526 if (value) { 527 _misc_flags |= _misc_should_verify_class; 528 } else { 529 _misc_flags &= ~_misc_should_verify_class; 530 } 531 } 532 533 // marking 534 bool is_marked_dependent() const { return _is_marked_dependent; } 535 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 536 537 // initialization (virtuals from Klass) 538 bool should_be_initialized() const; // means that initialize should be called 539 void initialize(TRAPS); 540 void link_class(TRAPS); 541 bool link_class_or_fail(TRAPS); // returns false on failure 542 void rewrite_class(TRAPS); 543 void link_methods(TRAPS); 544 Method* class_initializer() const; 545 546 // set the class to initialized if no static initializer is present 547 void eager_initialize(Thread *thread); 548 549 // reference type 550 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 551 void set_reference_type(ReferenceType t) { 552 assert(t == (u1)t, "overflow"); 553 _reference_type = (u1)t; 554 } 555 556 // this class cp index 557 u2 this_class_index() const { return _this_class_index; } 558 void set_this_class_index(u2 index) { _this_class_index = index; } 559 560 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 561 562 // find local field, returns true if found 563 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 564 // find field in direct superinterfaces, returns the interface in which the field is defined 565 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 566 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 567 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 568 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 569 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 570 571 // find a non-static or static field given its offset within the class. 572 bool contains_field_offset(int offset) { 573 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); 574 } 575 576 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 577 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 578 579 // find a local method (returns NULL if not found) 580 Method* find_method(const Symbol* name, const Symbol* signature) const; 581 static Method* find_method(const Array<Method*>* methods, 582 const Symbol* name, 583 const Symbol* signature); 584 585 // find a local method, but skip static methods 586 Method* find_instance_method(const Symbol* name, const Symbol* signature, 587 PrivateLookupMode private_mode = find_private) const; 588 static Method* find_instance_method(const Array<Method*>* methods, 589 const Symbol* name, 590 const Symbol* signature, 591 PrivateLookupMode private_mode = find_private); 592 593 // find a local method (returns NULL if not found) 594 Method* find_local_method(const Symbol* name, 595 const Symbol* signature, 596 OverpassLookupMode overpass_mode, 597 StaticLookupMode static_mode, 598 PrivateLookupMode private_mode) const; 599 600 // find a local method from given methods array (returns NULL if not found) 601 static Method* find_local_method(const Array<Method*>* methods, 602 const Symbol* name, 603 const Symbol* signature, 604 OverpassLookupMode overpass_mode, 605 StaticLookupMode static_mode, 606 PrivateLookupMode private_mode); 607 608 // find a local method index in methods or default_methods (returns -1 if not found) 609 static int find_method_index(const Array<Method*>* methods, 610 const Symbol* name, 611 const Symbol* signature, 612 OverpassLookupMode overpass_mode, 613 StaticLookupMode static_mode, 614 PrivateLookupMode private_mode); 615 616 // lookup operation (returns NULL if not found) 617 Method* uncached_lookup_method(const Symbol* name, 618 const Symbol* signature, 619 OverpassLookupMode overpass_mode, 620 PrivateLookupMode private_mode = find_private) const; 621 622 // lookup a method in all the interfaces that this class implements 623 // (returns NULL if not found) 624 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 625 626 // lookup a method in local defaults then in all interfaces 627 // (returns NULL if not found) 628 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 629 630 // Find method indices by name. If a method with the specified name is 631 // found the index to the first method is returned, and 'end' is filled in 632 // with the index of first non-name-matching method. If no method is found 633 // -1 is returned. 634 int find_method_by_name(const Symbol* name, int* end) const; 635 static int find_method_by_name(const Array<Method*>* methods, 636 const Symbol* name, int* end); 637 638 // constant pool 639 ConstantPool* constants() const { return _constants; } 640 void set_constants(ConstantPool* c) { _constants = c; } 641 642 // protection domain 643 oop protection_domain() const; 644 645 // signers 646 objArrayOop signers() const; 647 648 // host class 649 InstanceKlass* unsafe_anonymous_host() const { 650 InstanceKlass** hk = adr_unsafe_anonymous_host(); 651 if (hk == NULL) { 652 assert(!is_unsafe_anonymous(), "Unsafe anonymous classes have host klasses"); 653 return NULL; 654 } else { 655 assert(*hk != NULL, "host klass should always be set if the address is not null"); 656 assert(is_unsafe_anonymous(), "Only unsafe anonymous classes have host klasses"); 657 return *hk; 658 } 659 } 660 void set_unsafe_anonymous_host(const InstanceKlass* host) { 661 assert(is_unsafe_anonymous(), "not unsafe anonymous"); 662 const InstanceKlass** addr = (const InstanceKlass **)adr_unsafe_anonymous_host(); 663 assert(addr != NULL, "no reversed space"); 664 if (addr != NULL) { 665 *addr = host; 666 } 667 } 668 bool is_unsafe_anonymous() const { 669 return (_misc_flags & _misc_is_unsafe_anonymous) != 0; 670 } 671 void set_is_unsafe_anonymous(bool value) { 672 if (value) { 673 _misc_flags |= _misc_is_unsafe_anonymous; 674 } else { 675 _misc_flags &= ~_misc_is_unsafe_anonymous; 676 } 677 } 678 679 // Oop that keeps the metadata for this class from being unloaded 680 // in places where the metadata is stored in other places, like nmethods 681 oop klass_holder() const { 682 return (is_unsafe_anonymous()) ? java_mirror() : class_loader(); 683 } 684 685 bool is_contended() const { 686 return (_misc_flags & _misc_is_contended) != 0; 687 } 688 void set_is_contended(bool value) { 689 if (value) { 690 _misc_flags |= _misc_is_contended; 691 } else { 692 _misc_flags &= ~_misc_is_contended; 693 } 694 } 695 696 // source file name 697 Symbol* source_file_name() const { 698 return (_source_file_name_index == 0) ? 699 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index); 700 } 701 u2 source_file_name_index() const { 702 return _source_file_name_index; 703 } 704 void set_source_file_name_index(u2 sourcefile_index) { 705 _source_file_name_index = sourcefile_index; 706 } 707 708 // minor and major version numbers of class file 709 u2 minor_version() const { return _minor_version; } 710 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 711 u2 major_version() const { return _major_version; } 712 void set_major_version(u2 major_version) { _major_version = major_version; } 713 714 // source debug extension 715 const char* source_debug_extension() const { return _source_debug_extension; } 716 void set_source_debug_extension(const char* array, int length); 717 718 // symbol unloading support (refcount already added) 719 Symbol* array_name() { return _array_name; } 720 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; } 721 722 // nonstatic oop-map blocks 723 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 724 return oop_map_count * OopMapBlock::size_in_words(); 725 } 726 unsigned int nonstatic_oop_map_count() const { 727 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 728 } 729 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 730 void set_nonstatic_oop_map_size(int words) { 731 _nonstatic_oop_map_size = words; 732 } 733 734 #if INCLUDE_JVMTI 735 // Redefinition locking. Class can only be redefined by one thread at a time. 736 bool is_being_redefined() const { return _is_being_redefined; } 737 void set_is_being_redefined(bool value) { _is_being_redefined = value; } 738 739 // RedefineClasses() support for previous versions: 740 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 741 void purge_previous_version_list(); 742 743 InstanceKlass* previous_versions() const { return _previous_versions; } 744 #else 745 InstanceKlass* previous_versions() const { return NULL; } 746 #endif 747 748 InstanceKlass* get_klass_version(int version) { 749 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 750 if (ik->constants()->version() == version) { 751 return ik; 752 } 753 } 754 return NULL; 755 } 756 757 bool has_been_redefined() const { 758 return (_misc_flags & _misc_has_been_redefined) != 0; 759 } 760 void set_has_been_redefined() { 761 _misc_flags |= _misc_has_been_redefined; 762 } 763 764 bool has_passed_fingerprint_check() const { 765 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0; 766 } 767 void set_has_passed_fingerprint_check(bool b) { 768 if (b) { 769 _misc_flags |= _misc_has_passed_fingerprint_check; 770 } else { 771 _misc_flags &= ~_misc_has_passed_fingerprint_check; 772 } 773 } 774 bool supers_have_passed_fingerprint_checks(); 775 776 static bool should_store_fingerprint(bool is_unsafe_anonymous); 777 bool should_store_fingerprint() const { return should_store_fingerprint(is_unsafe_anonymous()); } 778 bool has_stored_fingerprint() const; 779 uint64_t get_stored_fingerprint() const; 780 void store_fingerprint(uint64_t fingerprint); 781 782 bool is_scratch_class() const { 783 return (_misc_flags & _misc_is_scratch_class) != 0; 784 } 785 786 void set_is_scratch_class() { 787 _misc_flags |= _misc_is_scratch_class; 788 } 789 790 bool has_resolved_methods() const { 791 return (_misc_flags & _misc_has_resolved_methods) != 0; 792 } 793 794 void set_has_resolved_methods() { 795 _misc_flags |= _misc_has_resolved_methods; 796 } 797 private: 798 799 void set_kind(unsigned kind) { 800 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind"); 801 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos; 802 unsigned flags = _misc_flags & ~fmask; 803 _misc_flags = (flags | (kind << _misc_kind_field_pos)); 804 } 805 806 bool is_kind(unsigned desired) const { 807 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask; 808 return kind == desired; 809 } 810 811 public: 812 813 // Other is anything that is not one of the more specialized kinds of InstanceKlass. 814 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); } 815 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); } 816 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); } 817 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); } 818 819 #if INCLUDE_JVMTI 820 821 void init_previous_versions() { 822 _previous_versions = NULL; 823 } 824 825 private: 826 static bool _has_previous_versions; 827 public: 828 static void purge_previous_versions(InstanceKlass* ik) { 829 if (ik->has_been_redefined()) { 830 ik->purge_previous_version_list(); 831 } 832 } 833 834 static bool has_previous_versions_and_reset(); 835 static bool has_previous_versions() { return _has_previous_versions; } 836 837 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 838 void set_cached_class_file(JvmtiCachedClassFileData *data) { 839 _cached_class_file = data; 840 } 841 JvmtiCachedClassFileData * get_cached_class_file(); 842 jint get_cached_class_file_len(); 843 unsigned char * get_cached_class_file_bytes(); 844 845 // JVMTI: Support for caching of field indices, types, and offsets 846 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 847 _jvmti_cached_class_field_map = descriptor; 848 } 849 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 850 return _jvmti_cached_class_field_map; 851 } 852 853 #if INCLUDE_CDS 854 void set_archived_class_data(JvmtiCachedClassFileData* data) { 855 _cached_class_file = data; 856 } 857 858 JvmtiCachedClassFileData * get_archived_class_data(); 859 #endif // INCLUDE_CDS 860 #else // INCLUDE_JVMTI 861 862 static void purge_previous_versions(InstanceKlass* ik) { return; }; 863 static bool has_previous_versions_and_reset() { return false; } 864 865 void set_cached_class_file(JvmtiCachedClassFileData *data) { 866 assert(data == NULL, "unexpected call with JVMTI disabled"); 867 } 868 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; } 869 870 #endif // INCLUDE_JVMTI 871 872 bool has_nonstatic_concrete_methods() const { 873 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0; 874 } 875 void set_has_nonstatic_concrete_methods(bool b) { 876 if (b) { 877 _misc_flags |= _misc_has_nonstatic_concrete_methods; 878 } else { 879 _misc_flags &= ~_misc_has_nonstatic_concrete_methods; 880 } 881 } 882 883 bool declares_nonstatic_concrete_methods() const { 884 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0; 885 } 886 void set_declares_nonstatic_concrete_methods(bool b) { 887 if (b) { 888 _misc_flags |= _misc_declares_nonstatic_concrete_methods; 889 } else { 890 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods; 891 } 892 } 893 894 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 895 inline u2 next_method_idnum(); 896 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 897 898 // generics support 899 Symbol* generic_signature() const { 900 return (_generic_signature_index == 0) ? 901 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index); 902 } 903 u2 generic_signature_index() const { 904 return _generic_signature_index; 905 } 906 void set_generic_signature_index(u2 sig_index) { 907 _generic_signature_index = sig_index; 908 } 909 910 u2 enclosing_method_data(int offset) const; 911 u2 enclosing_method_class_index() const { 912 return enclosing_method_data(enclosing_method_class_index_offset); 913 } 914 u2 enclosing_method_method_index() { 915 return enclosing_method_data(enclosing_method_method_index_offset); 916 } 917 void set_enclosing_method_indices(u2 class_index, 918 u2 method_index); 919 920 // jmethodID support 921 jmethodID get_jmethod_id(const methodHandle& method_h); 922 jmethodID get_jmethod_id_fetch_or_update(size_t idnum, 923 jmethodID new_id, jmethodID* new_jmeths, 924 jmethodID* to_dealloc_id_p, 925 jmethodID** to_dealloc_jmeths_p); 926 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 927 size_t *length_p, jmethodID* id_p); 928 void ensure_space_for_methodids(int start_offset = 0); 929 jmethodID jmethod_id_or_null(Method* method); 930 931 // annotations support 932 Annotations* annotations() const { return _annotations; } 933 void set_annotations(Annotations* anno) { _annotations = anno; } 934 935 AnnotationArray* class_annotations() const { 936 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 937 } 938 Array<AnnotationArray*>* fields_annotations() const { 939 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 940 } 941 AnnotationArray* class_type_annotations() const { 942 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 943 } 944 Array<AnnotationArray*>* fields_type_annotations() const { 945 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 946 } 947 // allocation 948 instanceOop allocate_instance(TRAPS); 949 950 // additional member function to return a handle 951 instanceHandle allocate_instance_handle(TRAPS); 952 953 objArrayOop allocate_objArray(int n, int length, TRAPS); 954 // Helper function 955 static instanceOop register_finalizer(instanceOop i, TRAPS); 956 957 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 958 // if not, throw either an Error or an Exception. 959 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 960 961 // initialization 962 void call_class_initializer(TRAPS); 963 void set_initialization_state_and_notify(ClassState state, TRAPS); 964 965 // OopMapCache support 966 OopMapCache* oop_map_cache() { return _oop_map_cache; } 967 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 968 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 969 970 // JNI identifier support (for static fields - for jni performance) 971 JNIid* jni_ids() { return _jni_ids; } 972 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 973 JNIid* jni_id_for(int offset); 974 975 // maintenance of deoptimization dependencies 976 inline DependencyContext dependencies(); 977 int mark_dependent_nmethods(KlassDepChange& changes); 978 void add_dependent_nmethod(nmethod* nm); 979 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately); 980 981 // On-stack replacement support 982 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 983 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 984 void add_osr_nmethod(nmethod* n); 985 bool remove_osr_nmethod(nmethod* n); 986 int mark_osr_nmethods(const Method* m); 987 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 988 989 #if INCLUDE_JVMTI 990 // Breakpoint support (see methods on Method* for details) 991 BreakpointInfo* breakpoints() const { return _breakpoints; }; 992 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 993 #endif 994 995 // support for stub routines 996 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 997 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;) 998 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 999 1000 // subclass/subinterface checks 1001 bool implements_interface(Klass* k) const; 1002 bool is_same_or_direct_interface(Klass* k) const; 1003 1004 #ifdef ASSERT 1005 // check whether this class or one of its superclasses was redefined 1006 bool has_redefined_this_or_super() const; 1007 #endif 1008 1009 // Access to the implementor of an interface. 1010 Klass* implementor() const; 1011 void set_implementor(Klass* k); 1012 int nof_implementors() const; 1013 void add_implementor(Klass* k); // k is a new class that implements this interface 1014 void init_implementor(); // initialize 1015 1016 // link this class into the implementors list of every interface it implements 1017 void process_interfaces(Thread *thread); 1018 1019 // virtual operations from Klass 1020 bool is_leaf_class() const { return _subklass == NULL; } 1021 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 1022 Array<InstanceKlass*>* transitive_interfaces); 1023 bool compute_is_subtype_of(Klass* k); 1024 bool can_be_primary_super_slow() const; 1025 int oop_size(oop obj) const { return size_helper(); } 1026 // slow because it's a virtual call and used for verifying the layout_helper. 1027 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 1028 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 1029 1030 // Iterators 1031 void do_local_static_fields(FieldClosure* cl); 1032 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 1033 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 1034 1035 void methods_do(void f(Method* method)); 1036 void array_klasses_do(void f(Klass* k)); 1037 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 1038 bool super_types_do(SuperTypeClosure* blk); 1039 1040 static InstanceKlass* cast(Klass* k) { 1041 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 1042 } 1043 1044 static const InstanceKlass* cast(const Klass* k) { 1045 assert(k != NULL, "k should not be null"); 1046 assert(k->is_instance_klass(), "cast to InstanceKlass"); 1047 return static_cast<const InstanceKlass*>(k); 1048 } 1049 1050 virtual InstanceKlass* java_super() const { 1051 return (super() == NULL) ? NULL : cast(super()); 1052 } 1053 1054 // Sizing (in words) 1055 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 1056 1057 static int size(int vtable_length, int itable_length, 1058 int nonstatic_oop_map_size, 1059 bool is_interface, bool is_unsafe_anonymous, bool has_stored_fingerprint) { 1060 return align_metadata_size(header_size() + 1061 vtable_length + 1062 itable_length + 1063 nonstatic_oop_map_size + 1064 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) + 1065 (is_unsafe_anonymous ? (int)sizeof(Klass*)/wordSize : 0) + 1066 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0)); 1067 } 1068 int size() const { return size(vtable_length(), 1069 itable_length(), 1070 nonstatic_oop_map_size(), 1071 is_interface(), 1072 is_unsafe_anonymous(), 1073 has_stored_fingerprint()); 1074 } 1075 #if INCLUDE_SERVICES 1076 virtual void collect_statistics(KlassSizeStats *sz) const; 1077 #endif 1078 1079 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); } 1080 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 1081 1082 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 1083 1084 oop static_field_base_raw() { return java_mirror(); } 1085 1086 OopMapBlock* start_of_nonstatic_oop_maps() const { 1087 return (OopMapBlock*)(start_of_itable() + itable_length()); 1088 } 1089 1090 Klass** end_of_nonstatic_oop_maps() const { 1091 return (Klass**)(start_of_nonstatic_oop_maps() + 1092 nonstatic_oop_map_count()); 1093 } 1094 1095 Klass** adr_implementor() const { 1096 if (is_interface()) { 1097 return (Klass**)end_of_nonstatic_oop_maps(); 1098 } else { 1099 return NULL; 1100 } 1101 }; 1102 1103 InstanceKlass** adr_unsafe_anonymous_host() const { 1104 if (is_unsafe_anonymous()) { 1105 InstanceKlass** adr_impl = (InstanceKlass **)adr_implementor(); 1106 if (adr_impl != NULL) { 1107 return adr_impl + 1; 1108 } else { 1109 return (InstanceKlass **)end_of_nonstatic_oop_maps(); 1110 } 1111 } else { 1112 return NULL; 1113 } 1114 } 1115 1116 address adr_fingerprint() const { 1117 if (has_stored_fingerprint()) { 1118 InstanceKlass** adr_host = adr_unsafe_anonymous_host(); 1119 if (adr_host != NULL) { 1120 return (address)(adr_host + 1); 1121 } 1122 1123 Klass** adr_impl = adr_implementor(); 1124 if (adr_impl != NULL) { 1125 return (address)(adr_impl + 1); 1126 } 1127 1128 return (address)end_of_nonstatic_oop_maps(); 1129 } else { 1130 return NULL; 1131 } 1132 } 1133 1134 // Use this to return the size of an instance in heap words: 1135 int size_helper() const { 1136 return layout_helper_to_size_helper(layout_helper()); 1137 } 1138 1139 // This bit is initialized in classFileParser.cpp. 1140 // It is false under any of the following conditions: 1141 // - the class is abstract (including any interface) 1142 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1143 // - the class size is larger than FastAllocateSizeLimit 1144 // - the class is java/lang/Class, which cannot be allocated directly 1145 bool can_be_fastpath_allocated() const { 1146 return !layout_helper_needs_slow_path(layout_helper()); 1147 } 1148 1149 // Java itable 1150 klassItable itable() const; // return klassItable wrapper 1151 Method* method_at_itable(Klass* holder, int index, TRAPS); 1152 1153 #if INCLUDE_JVMTI 1154 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed); 1155 #endif // INCLUDE_JVMTI 1156 1157 void clean_weak_instanceklass_links(); 1158 private: 1159 void clean_implementors_list(); 1160 void clean_method_data(); 1161 1162 public: 1163 // Explicit metaspace deallocation of fields 1164 // For RedefineClasses and class file parsing errors, we need to deallocate 1165 // instanceKlasses and the metadata they point to. 1166 void deallocate_contents(ClassLoaderData* loader_data); 1167 static void deallocate_methods(ClassLoaderData* loader_data, 1168 Array<Method*>* methods); 1169 void static deallocate_interfaces(ClassLoaderData* loader_data, 1170 const Klass* super_klass, 1171 Array<InstanceKlass*>* local_interfaces, 1172 Array<InstanceKlass*>* transitive_interfaces); 1173 1174 // The constant pool is on stack if any of the methods are executing or 1175 // referenced by handles. 1176 bool on_stack() const { return _constants->on_stack(); } 1177 1178 // callbacks for actions during class unloading 1179 static void unload_class(InstanceKlass* ik); 1180 static void release_C_heap_structures(InstanceKlass* ik); 1181 1182 // Naming 1183 const char* signature_name() const; 1184 static Symbol* package_from_name(const Symbol* name, TRAPS); 1185 1186 // Oop fields (and metadata) iterators 1187 // 1188 // The InstanceKlass iterators also visits the Object's klass. 1189 1190 // Forward iteration 1191 public: 1192 // Iterate over all oop fields in the oop maps. 1193 template <typename T, class OopClosureType> 1194 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1195 1196 // Iterate over all oop fields and metadata. 1197 template <typename T, class OopClosureType> 1198 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 1199 1200 // Iterate over all oop fields in one oop map. 1201 template <typename T, class OopClosureType> 1202 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1203 1204 1205 // Reverse iteration 1206 // Iterate over all oop fields and metadata. 1207 template <typename T, class OopClosureType> 1208 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1209 1210 private: 1211 // Iterate over all oop fields in the oop maps. 1212 template <typename T, class OopClosureType> 1213 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1214 1215 // Iterate over all oop fields in one oop map. 1216 template <typename T, class OopClosureType> 1217 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1218 1219 1220 // Bounded range iteration 1221 public: 1222 // Iterate over all oop fields in the oop maps. 1223 template <typename T, class OopClosureType> 1224 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1225 1226 // Iterate over all oop fields and metadata. 1227 template <typename T, class OopClosureType> 1228 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1229 1230 private: 1231 // Iterate over all oop fields in one oop map. 1232 template <typename T, class OopClosureType> 1233 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1234 1235 1236 public: 1237 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1238 1239 public: 1240 void set_in_error_state() { 1241 assert(DumpSharedSpaces, "only call this when dumping archive"); 1242 _init_state = initialization_error; 1243 } 1244 bool check_sharing_error_state(); 1245 1246 private: 1247 // initialization state 1248 #ifdef ASSERT 1249 void set_init_state(ClassState state); 1250 #else 1251 void set_init_state(ClassState state) { _init_state = (u1)state; } 1252 #endif 1253 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1254 void set_init_thread(Thread *thread) { _init_thread = thread; } 1255 1256 // The RedefineClasses() API can cause new method idnums to be needed 1257 // which will cause the caches to grow. Safety requires different 1258 // cache management logic if the caches can grow instead of just 1259 // going from NULL to non-NULL. 1260 bool idnum_can_increment() const { return has_been_redefined(); } 1261 inline jmethodID* methods_jmethod_ids_acquire() const; 1262 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1263 1264 // Lock during initialization 1265 public: 1266 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1267 // Must be one per class and it has to be a VM internal object so java code 1268 // cannot lock it (like the mirror). 1269 // It has to be an object not a Mutex because it's held through java calls. 1270 oop init_lock() const; 1271 private: 1272 void fence_and_clear_init_lock(); 1273 1274 bool link_class_impl (TRAPS); 1275 bool verify_code (TRAPS); 1276 void initialize_impl (TRAPS); 1277 void initialize_super_interfaces (TRAPS); 1278 void eager_initialize_impl (); 1279 /* jni_id_for_impl for jfieldID only */ 1280 JNIid* jni_id_for_impl (int offset); 1281 1282 // Returns the array class for the n'th dimension 1283 Klass* array_klass_impl(bool or_null, int n, TRAPS); 1284 1285 // Returns the array class with this class as element type 1286 Klass* array_klass_impl(bool or_null, TRAPS); 1287 1288 // find a local method (returns NULL if not found) 1289 Method* find_method_impl(const Symbol* name, 1290 const Symbol* signature, 1291 OverpassLookupMode overpass_mode, 1292 StaticLookupMode static_mode, 1293 PrivateLookupMode private_mode) const; 1294 1295 static Method* find_method_impl(const Array<Method*>* methods, 1296 const Symbol* name, 1297 const Symbol* signature, 1298 OverpassLookupMode overpass_mode, 1299 StaticLookupMode static_mode, 1300 PrivateLookupMode private_mode); 1301 1302 // Free CHeap allocated fields. 1303 void release_C_heap_structures(); 1304 1305 #if INCLUDE_JVMTI 1306 // RedefineClasses support 1307 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1308 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1309 #endif 1310 public: 1311 // CDS support - remove and restore oops from metadata. Oops are not shared. 1312 virtual void remove_unshareable_info(); 1313 virtual void remove_java_mirror(); 1314 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 1315 1316 // jvm support 1317 jint compute_modifier_flags(TRAPS) const; 1318 1319 public: 1320 // JVMTI support 1321 jint jvmti_class_status() const; 1322 1323 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 1324 1325 public: 1326 // Printing 1327 #ifndef PRODUCT 1328 void print_on(outputStream* st) const; 1329 #endif 1330 void print_value_on(outputStream* st) const; 1331 1332 void oop_print_value_on(oop obj, outputStream* st); 1333 1334 #ifndef PRODUCT 1335 void oop_print_on (oop obj, outputStream* st); 1336 1337 void print_dependent_nmethods(bool verbose = false); 1338 bool is_dependent_nmethod(nmethod* nm); 1339 bool verify_itable_index(int index); 1340 #endif 1341 1342 const char* internal_name() const; 1343 1344 // Verification 1345 void verify_on(outputStream* st); 1346 1347 void oop_verify_on(oop obj, outputStream* st); 1348 1349 // Logging 1350 void print_class_load_logging(ClassLoaderData* loader_data, 1351 const char* module_name, 1352 const ClassFileStream* cfs) const; 1353 }; 1354 1355 // for adding methods 1356 // UNSET_IDNUM return means no more ids available 1357 inline u2 InstanceKlass::next_method_idnum() { 1358 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1359 return ConstMethod::UNSET_IDNUM; // no more ids available 1360 } else { 1361 return _idnum_allocated_count++; 1362 } 1363 } 1364 1365 1366 /* JNIid class for jfieldIDs only */ 1367 class JNIid: public CHeapObj<mtClass> { 1368 friend class VMStructs; 1369 private: 1370 Klass* _holder; 1371 JNIid* _next; 1372 int _offset; 1373 #ifdef ASSERT 1374 bool _is_static_field_id; 1375 #endif 1376 1377 public: 1378 // Accessors 1379 Klass* holder() const { return _holder; } 1380 int offset() const { return _offset; } 1381 JNIid* next() { return _next; } 1382 // Constructor 1383 JNIid(Klass* holder, int offset, JNIid* next); 1384 // Identifier lookup 1385 JNIid* find(int offset); 1386 1387 bool find_local_field(fieldDescriptor* fd) { 1388 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1389 } 1390 1391 static void deallocate(JNIid* id); 1392 // Debugging 1393 #ifdef ASSERT 1394 bool is_static_field_id() const { return _is_static_field_id; } 1395 void set_is_static_field_id() { _is_static_field_id = true; } 1396 #endif 1397 void verify(Klass* holder); 1398 }; 1399 1400 // An iterator that's used to access the inner classes indices in the 1401 // InstanceKlass::_inner_classes array. 1402 class InnerClassesIterator : public StackObj { 1403 private: 1404 Array<jushort>* _inner_classes; 1405 int _length; 1406 int _idx; 1407 public: 1408 1409 InnerClassesIterator(const InstanceKlass* k) { 1410 _inner_classes = k->inner_classes(); 1411 if (k->inner_classes() != NULL) { 1412 _length = _inner_classes->length(); 1413 // The inner class array's length should be the multiple of 1414 // inner_class_next_offset if it only contains the InnerClasses 1415 // attribute data, or it should be 1416 // n*inner_class_next_offset+enclosing_method_attribute_size 1417 // if it also contains the EnclosingMethod data. 1418 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1419 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1420 "just checking"); 1421 // Remove the enclosing_method portion if exists. 1422 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1423 _length -= InstanceKlass::enclosing_method_attribute_size; 1424 } 1425 } else { 1426 _length = 0; 1427 } 1428 _idx = 0; 1429 } 1430 1431 int length() const { 1432 return _length; 1433 } 1434 1435 void next() { 1436 _idx += InstanceKlass::inner_class_next_offset; 1437 } 1438 1439 bool done() const { 1440 return (_idx >= _length); 1441 } 1442 1443 u2 inner_class_info_index() const { 1444 return _inner_classes->at( 1445 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1446 } 1447 1448 void set_inner_class_info_index(u2 index) { 1449 _inner_classes->at_put( 1450 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1451 } 1452 1453 u2 outer_class_info_index() const { 1454 return _inner_classes->at( 1455 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1456 } 1457 1458 void set_outer_class_info_index(u2 index) { 1459 _inner_classes->at_put( 1460 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1461 } 1462 1463 u2 inner_name_index() const { 1464 return _inner_classes->at( 1465 _idx + InstanceKlass::inner_class_inner_name_offset); 1466 } 1467 1468 void set_inner_name_index(u2 index) { 1469 _inner_classes->at_put( 1470 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1471 } 1472 1473 u2 inner_access_flags() const { 1474 return _inner_classes->at( 1475 _idx + InstanceKlass::inner_class_access_flags_offset); 1476 } 1477 }; 1478 1479 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP