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 "code/vmreg.hpp" 33 #include "gc/shared/specialized_oop_closures.hpp" 34 #include "memory/referenceType.hpp" 35 #include "oops/annotations.hpp" 36 #include "oops/constMethod.hpp" 37 #include "oops/fieldInfo.hpp" 38 #include "oops/instanceOop.hpp" 39 #include "oops/klassVtable.hpp" 40 #include "runtime/handles.hpp" 41 #include "runtime/os.hpp" 42 #include "trace/traceMacros.hpp" 43 #include "utilities/accessFlags.hpp" 44 #include "utilities/align.hpp" 45 #include "utilities/macros.hpp" 46 47 // An InstanceKlass is the VM level representation of a Java class. 48 // It contains all information needed for at class at execution runtime. 49 50 // InstanceKlass embedded field layout (after declared fields): 51 // [EMBEDDED Java vtable ] size in words = vtable_len 52 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size 53 // The embedded nonstatic oop-map blocks are short pairs (offset, length) 54 // indicating where oops are located in instances of this klass. 55 // [EMBEDDED implementor of the interface] only exist for interface 56 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled) 57 // [EMBEDDED fingerprint ] only if should_store_fingerprint()==true 58 // [EMBEDDED ValueKlassFixedBlock] only if is a ValueKlass instance 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 class BufferedValueTypeBlob; 74 75 // This is used in iterators below. 76 class FieldClosure: public StackObj { 77 public: 78 virtual void do_field(fieldDescriptor* fd) = 0; 79 }; 80 81 #ifndef PRODUCT 82 // Print fields. 83 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. 84 class FieldPrinter: public FieldClosure { 85 oop _obj; 86 outputStream* _st; 87 public: 88 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} 89 void do_field(fieldDescriptor* fd); 90 }; 91 #endif // !PRODUCT 92 93 // ValueObjs embedded in klass. Describes where oops are located in instances of 94 // this klass. 95 class OopMapBlock VALUE_OBJ_CLASS_SPEC { 96 public: 97 // Byte offset of the first oop mapped by this block. 98 int offset() const { return _offset; } 99 void set_offset(int offset) { _offset = offset; } 100 101 // Number of oops in this block. 102 uint count() const { return _count; } 103 void set_count(uint count) { _count = count; } 104 105 void increment_count(int diff) { _count += diff; } 106 107 int offset_span() const { return _count * heapOopSize; } 108 109 int end_offset() const { 110 return offset() + offset_span(); 111 } 112 113 bool is_contiguous(int another_offset) const { 114 return another_offset == end_offset(); 115 } 116 117 // sizeof(OopMapBlock) in words. 118 static const int size_in_words() { 119 return align_up((int)sizeof(OopMapBlock), wordSize) >> 120 LogBytesPerWord; 121 } 122 123 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) { 124 return a->offset() - b->offset(); 125 } 126 127 private: 128 int _offset; 129 uint _count; 130 }; 131 132 struct JvmtiCachedClassFileData; 133 134 class SigEntry; 135 136 class ValueKlassFixedBlock VALUE_OBJ_CLASS_SPEC { 137 Array<SigEntry>** _extended_sig; 138 Array<VMRegPair>** _return_regs; 139 address* _pack_handler; 140 address* _unpack_handler; 141 int* _default_value_offset; 142 143 friend class ValueKlass; 144 }; 145 146 class ValueTypes VALUE_OBJ_CLASS_SPEC { 147 public: 148 u2 _class_info_index; 149 Symbol* _class_name; 150 }; 151 152 class InstanceKlass: public Klass { 153 friend class VMStructs; 154 friend class JVMCIVMStructs; 155 friend class ClassFileParser; 156 friend class CompileReplay; 157 158 protected: 159 InstanceKlass(const ClassFileParser& parser, unsigned kind); 160 161 public: 162 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } 163 164 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 165 // of the class loading & initialization procedure, and the use of the states. 166 enum ClassState { 167 allocated, // allocated (but not yet linked) 168 loaded, // loaded and inserted in class hierarchy (but not linked yet) 169 linked, // successfully linked/verified (but not initialized yet) 170 being_initialized, // currently running class initializer 171 fully_initialized, // initialized (successfull final state) 172 initialization_error // error happened during initialization 173 }; 174 175 private: 176 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS); 177 178 protected: 179 // If you add a new field that points to any metaspace object, you 180 // must add this field to InstanceKlass::metaspace_pointers_do(). 181 182 // Annotations for this class 183 Annotations* _annotations; 184 // Package this class is defined in 185 PackageEntry* _package_entry; 186 // Array classes holding elements of this class. 187 Klass* volatile _array_klasses; 188 // Constant pool for this class. 189 ConstantPool* _constants; 190 // The InnerClasses attribute and EnclosingMethod attribute. The 191 // _inner_classes is an array of shorts. If the class has InnerClasses 192 // attribute, then the _inner_classes array begins with 4-tuples of shorts 193 // [inner_class_info_index, outer_class_info_index, 194 // inner_name_index, inner_class_access_flags] for the InnerClasses 195 // attribute. If the EnclosingMethod attribute exists, it occupies the 196 // last two shorts [class_index, method_index] of the array. If only 197 // the InnerClasses attribute exists, the _inner_classes array length is 198 // number_of_inner_classes * 4. If the class has both InnerClasses 199 // and EnclosingMethod attributes the _inner_classes array length is 200 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 201 Array<jushort>* _inner_classes; 202 203 Array<ValueTypes>* _value_types; 204 205 // the source debug extension for this klass, NULL if not specified. 206 // Specified as UTF-8 string without terminating zero byte in the classfile, 207 // it is stored in the instanceklass as a NULL-terminated UTF-8 string 208 const char* _source_debug_extension; 209 // Array name derived from this class which needs unreferencing 210 // if this class is unloaded. 211 Symbol* _array_name; 212 213 // Number of heapOopSize words used by non-static fields in this klass 214 // (including inherited fields but after header_size()). 215 int _nonstatic_field_size; 216 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 217 // Constant pool index to the utf8 entry of the Generic signature, 218 // or 0 if none. 219 u2 _generic_signature_index; 220 // Constant pool index to the utf8 entry for the name of source file 221 // containing this klass, 0 if not specified. 222 u2 _source_file_name_index; 223 u2 _static_oop_field_count;// number of static oop fields in this klass 224 u2 _java_fields_count; // The number of declared Java fields 225 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 226 227 int _itable_len; // length of Java itable (in words) 228 // _is_marked_dependent can be set concurrently, thus cannot be part of the 229 // _misc_flags. 230 bool _is_marked_dependent; // used for marking during flushing and deoptimization 231 232 public: 233 enum { 234 _extra_is_being_redefined = 1 << 0, // used for locking redefinition 235 _extra_has_resolved_methods = 1 << 1, // resolved methods table entries added for this class 236 _extra_has_value_fields = 1 << 2, // has value fields and related embedded section is not empty 237 _extra_is_bufferable = 1 << 3 // value can be buffered out side of the Java heap 238 }; 239 240 protected: 241 u1 _extra_flags; 242 243 // The low three bits of _misc_flags contains the kind field. 244 // This can be used to quickly discriminate among the five kinds of 245 // InstanceKlass. 246 247 static const unsigned _misc_kind_field_size = 3; 248 static const unsigned _misc_kind_field_pos = 0; 249 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u; 250 251 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass 252 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass 253 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass 254 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass 255 static const unsigned _misc_kind_value_type = 4; // ValueKlass 256 257 // Start after _misc_kind field. 258 enum { 259 _misc_rewritten = 1 << 3, // methods rewritten. 260 _misc_has_nonstatic_fields = 1 << 4, // for sizing with UseCompressedOops 261 _misc_should_verify_class = 1 << 5, // allow caching of preverification 262 _misc_is_anonymous = 1 << 6, // has embedded _host_klass field 263 _misc_is_contended = 1 << 7, // marked with contended annotation 264 _misc_has_nonstatic_concrete_methods = 1 << 8, // class/superclass/implemented interfaces has non-static, concrete methods 265 _misc_declares_nonstatic_concrete_methods = 1 << 9, // directly declares non-static, concrete methods 266 _misc_has_been_redefined = 1 << 10, // class has been redefined 267 _misc_has_passed_fingerprint_check = 1 << 11, // when this class was loaded, the fingerprint computed from its 268 // code source was found to be matching the value recorded by AOT. 269 _misc_is_scratch_class = 1 << 12, // class is the redefined scratch class 270 _misc_is_shared_boot_class = 1 << 13, // defining class loader is boot class loader 271 _misc_is_shared_platform_class = 1 << 14, // defining class loader is platform class loader 272 _misc_is_shared_app_class = 1 << 15 // defining class loader is app class loader 273 // u2 _misc_flags full (see _extra_flags) 274 }; 275 u2 loader_type_bits() { 276 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class; 277 } 278 u2 _misc_flags; 279 u2 _minor_version; // minor version number of class file 280 u2 _major_version; // major version number of class file 281 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) 282 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 283 JNIid* _jni_ids; // First JNI identifier for static fields in this class 284 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 285 intptr_t _dep_context; // packed DependencyContext structure 286 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 287 #if INCLUDE_JVMTI 288 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 289 // Linked instanceKlasses of previous versions 290 InstanceKlass* _previous_versions; 291 // JVMTI fields can be moved to their own structure - see 6315920 292 // JVMTI: cached class file, before retransformable agent modified it in CFLH 293 JvmtiCachedClassFileData* _cached_class_file; 294 #endif 295 296 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 297 298 // Class states are defined as ClassState (see above). 299 // Place the _init_state here to utilize the unused 2-byte after 300 // _idnum_allocated_count. 301 u1 _init_state; // state of class 302 u1 _reference_type; // reference type 303 304 #if INCLUDE_JVMTI 305 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 306 #endif 307 308 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 309 310 // Method array. 311 Array<Method*>* _methods; 312 // Default Method Array, concrete methods inherited from interfaces 313 Array<Method*>* _default_methods; 314 // Interface (Klass*s) this class declares locally to implement. 315 Array<Klass*>* _local_interfaces; 316 // Interface (Klass*s) this class implements transitively. 317 Array<Klass*>* _transitive_interfaces; 318 // Int array containing the original order of method in the class file (for JVMTI). 319 Array<int>* _method_ordering; 320 // Int array containing the vtable_indices for default_methods 321 // offset matches _default_methods offset 322 Array<int>* _default_vtable_indices; 323 324 // Instance and static variable information, starts with 6-tuples of shorts 325 // [access, name index, sig index, initval index, low_offset, high_offset] 326 // for all fields, followed by the generic signature data at the end of 327 // the array. Only fields with generic signature attributes have the generic 328 // signature data set in the array. The fields array looks like following: 329 // 330 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 331 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 332 // ... 333 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 334 // [generic signature index] 335 // [generic signature index] 336 // ... 337 Array<u2>* _fields; 338 339 // embedded Java vtable follows here 340 // embedded Java itables follows here 341 // embedded static fields follows here 342 // embedded nonstatic oop-map blocks follows here 343 // embedded implementor of this interface follows here 344 // The embedded implementor only exists if the current klass is an 345 // iterface. The possible values of the implementor fall into following 346 // three cases: 347 // NULL: no implementor. 348 // A Klass* that's not itself: one implementor. 349 // Itself: more than one implementors. 350 // embedded host klass follows here 351 // The embedded host klass only exists in an anonymous class for 352 // dynamic language support (JSR 292 enabled). The host class grants 353 // its access privileges to this class also. The host class is either 354 // named, or a previously loaded anonymous class. A non-anonymous class 355 // or an anonymous class loaded through normal classloading does not 356 // have this embedded field. 357 // 358 359 ValueKlassFixedBlock* _adr_valueklass_fixed_block; 360 361 friend class SystemDictionary; 362 363 public: 364 u2 loader_type() { 365 return _misc_flags & loader_type_bits(); 366 } 367 368 bool is_shared_boot_class() const { 369 return (_misc_flags & _misc_is_shared_boot_class) != 0; 370 } 371 bool is_shared_platform_class() const { 372 return (_misc_flags & _misc_is_shared_platform_class) != 0; 373 } 374 bool is_shared_app_class() const { 375 return (_misc_flags & _misc_is_shared_app_class) != 0; 376 } 377 378 void set_class_loader_type(s2 loader_type) { 379 switch (loader_type) { 380 case ClassLoader::BOOT_LOADER: 381 _misc_flags |= _misc_is_shared_boot_class; 382 break; 383 case ClassLoader::PLATFORM_LOADER: 384 _misc_flags |= _misc_is_shared_platform_class; 385 break; 386 case ClassLoader::APP_LOADER: 387 _misc_flags |= _misc_is_shared_app_class; 388 break; 389 default: 390 ShouldNotReachHere(); 391 break; 392 } 393 } 394 395 bool has_nonstatic_fields() const { 396 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 397 } 398 void set_has_nonstatic_fields(bool b) { 399 if (b) { 400 _misc_flags |= _misc_has_nonstatic_fields; 401 } else { 402 _misc_flags &= ~_misc_has_nonstatic_fields; 403 } 404 } 405 406 bool has_value_fields() const { 407 return (_extra_flags & _extra_has_value_fields) != 0; 408 } 409 void set_has_value_fields() { 410 _extra_flags |= _extra_has_value_fields; 411 } 412 413 // field sizes 414 int nonstatic_field_size() const { return _nonstatic_field_size; } 415 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 416 417 int static_field_size() const { return _static_field_size; } 418 void set_static_field_size(int size) { _static_field_size = size; } 419 420 int static_oop_field_count() const { return (int)_static_oop_field_count; } 421 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 422 423 // Java itable 424 int itable_length() const { return _itable_len; } 425 void set_itable_length(int len) { _itable_len = len; } 426 427 // array klasses 428 Klass* array_klasses() const { return _array_klasses; } 429 inline Klass* array_klasses_acquire() const; // load with acquire semantics 430 void set_array_klasses(Klass* k) { _array_klasses = k; } 431 inline void release_set_array_klasses(Klass* k); // store with release semantics 432 433 // methods 434 Array<Method*>* methods() const { return _methods; } 435 void set_methods(Array<Method*>* a) { _methods = a; } 436 Method* method_with_idnum(int idnum); 437 Method* method_with_orig_idnum(int idnum); 438 Method* method_with_orig_idnum(int idnum, int version); 439 440 // method ordering 441 Array<int>* method_ordering() const { return _method_ordering; } 442 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 443 void copy_method_ordering(const intArray* m, TRAPS); 444 445 // default_methods 446 Array<Method*>* default_methods() const { return _default_methods; } 447 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 448 449 // default method vtable_indices 450 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 451 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 452 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 453 454 // interfaces 455 Array<Klass*>* local_interfaces() const { return _local_interfaces; } 456 void set_local_interfaces(Array<Klass*>* a) { 457 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 458 _local_interfaces = a; } 459 460 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; } 461 void set_transitive_interfaces(Array<Klass*>* a) { 462 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 463 _transitive_interfaces = a; 464 } 465 466 private: 467 friend class fieldDescriptor; 468 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 469 470 public: 471 int field_offset (int index) const { return field(index)->offset(); } 472 int field_access_flags(int index) const { return field(index)->access_flags(); } 473 Symbol* field_name (int index) const { return field(index)->name(constants()); } 474 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 475 bool field_is_flattened(int index) const { return field(index)->is_flattened(); } 476 477 // Number of Java declared fields 478 int java_fields_count() const { return (int)_java_fields_count; } 479 480 Array<u2>* fields() const { return _fields; } 481 void set_fields(Array<u2>* f, u2 java_fields_count) { 482 guarantee(_fields == NULL || f == NULL, "Just checking"); 483 _fields = f; 484 _java_fields_count = java_fields_count; 485 } 486 487 // inner classes 488 Array<u2>* inner_classes() const { return _inner_classes; } 489 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 490 491 Array<ValueTypes>* value_types() const { return _value_types; } 492 void set_value_types(Array<ValueTypes>* f) { _value_types = f; } 493 494 bool is_declared_value_type(int index); 495 bool is_declared_value_type(Symbol* symbol); 496 497 static bool is_declared_value_type(Array<ValueTypes>* value_types, int index); 498 static bool is_declared_value_type(ConstantPool* constants, Array<ValueTypes>* value_types, Symbol* symbol); 499 500 enum InnerClassAttributeOffset { 501 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 502 inner_class_inner_class_info_offset = 0, 503 inner_class_outer_class_info_offset = 1, 504 inner_class_inner_name_offset = 2, 505 inner_class_access_flags_offset = 3, 506 inner_class_next_offset = 4 507 }; 508 509 enum EnclosingMethodAttributeOffset { 510 enclosing_method_class_index_offset = 0, 511 enclosing_method_method_index_offset = 1, 512 enclosing_method_attribute_size = 2 513 }; 514 515 // method override check 516 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 517 518 // package 519 PackageEntry* package() const { return _package_entry; } 520 ModuleEntry* module() const; 521 bool in_unnamed_package() const { return (_package_entry == NULL); } 522 void set_package(PackageEntry* p) { _package_entry = p; } 523 void set_package(ClassLoaderData* loader_data, TRAPS); 524 bool is_same_class_package(const Klass* class2) const; 525 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const; 526 527 // find an enclosing class 528 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const; 529 530 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index. 531 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const; 532 533 private: 534 // Check prohibited package ("java/" only loadable by boot or platform loaders) 535 static void check_prohibited_package(Symbol* class_name, 536 Handle class_loader, 537 TRAPS); 538 public: 539 // tell if two classes have the same enclosing class (at package level) 540 bool is_same_package_member(const Klass* class2, TRAPS) const; 541 542 // initialization state 543 bool is_loaded() const { return _init_state >= loaded; } 544 bool is_linked() const { return _init_state >= linked; } 545 bool is_initialized() const { return _init_state == fully_initialized; } 546 bool is_not_initialized() const { return _init_state < being_initialized; } 547 bool is_being_initialized() const { return _init_state == being_initialized; } 548 bool is_in_error_state() const { return _init_state == initialization_error; } 549 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 550 ClassState init_state() { return (ClassState)_init_state; } 551 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 552 553 // defineClass specified verification 554 bool should_verify_class() const { 555 return (_misc_flags & _misc_should_verify_class) != 0; 556 } 557 void set_should_verify_class(bool value) { 558 if (value) { 559 _misc_flags |= _misc_should_verify_class; 560 } else { 561 _misc_flags &= ~_misc_should_verify_class; 562 } 563 } 564 565 // marking 566 bool is_marked_dependent() const { return _is_marked_dependent; } 567 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 568 569 static ByteSize extra_flags_offset() { return in_ByteSize(offset_of(InstanceKlass, _extra_flags)); } 570 571 // initialization (virtuals from Klass) 572 bool should_be_initialized() const; // means that initialize should be called 573 void initialize(TRAPS); 574 void link_class(TRAPS); 575 bool link_class_or_fail(TRAPS); // returns false on failure 576 void unlink_class(); 577 void rewrite_class(TRAPS); 578 void link_methods(TRAPS); 579 Method* class_initializer() const; 580 581 // set the class to initialized if no static initializer is present 582 void eager_initialize(Thread *thread); 583 584 // reference type 585 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 586 void set_reference_type(ReferenceType t) { 587 assert(t == (u1)t, "overflow"); 588 _reference_type = (u1)t; 589 } 590 591 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 592 593 // find local field, returns true if found 594 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 595 // find field in direct superinterfaces, returns the interface in which the field is defined 596 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 597 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 598 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 599 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 600 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 601 602 // find a non-static or static field given its offset within the class. 603 bool contains_field_offset(int offset) { 604 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size(), is_value()); 605 } 606 607 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 608 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 609 610 // find a local method (returns NULL if not found) 611 Method* find_method(const Symbol* name, const Symbol* signature) const; 612 static Method* find_method(const Array<Method*>* methods, 613 const Symbol* name, 614 const Symbol* signature); 615 616 // find a local method, but skip static methods 617 Method* find_instance_method(const Symbol* name, const Symbol* signature) const; 618 static Method* find_instance_method(const Array<Method*>* methods, 619 const Symbol* name, 620 const Symbol* signature); 621 622 // find a local method (returns NULL if not found) 623 Method* find_local_method(const Symbol* name, 624 const Symbol* signature, 625 OverpassLookupMode overpass_mode, 626 StaticLookupMode static_mode, 627 PrivateLookupMode private_mode) const; 628 629 // find a local method from given methods array (returns NULL if not found) 630 static Method* find_local_method(const Array<Method*>* methods, 631 const Symbol* name, 632 const Symbol* signature, 633 OverpassLookupMode overpass_mode, 634 StaticLookupMode static_mode, 635 PrivateLookupMode private_mode); 636 637 // find a local method index in methods or default_methods (returns -1 if not found) 638 static int find_method_index(const Array<Method*>* methods, 639 const Symbol* name, 640 const Symbol* signature, 641 OverpassLookupMode overpass_mode, 642 StaticLookupMode static_mode, 643 PrivateLookupMode private_mode); 644 645 // lookup operation (returns NULL if not found) 646 Method* uncached_lookup_method(const Symbol* name, 647 const Symbol* signature, 648 OverpassLookupMode overpass_mode) const; 649 650 // lookup a method in all the interfaces that this class implements 651 // (returns NULL if not found) 652 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 653 654 // lookup a method in local defaults then in all interfaces 655 // (returns NULL if not found) 656 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 657 658 // Find method indices by name. If a method with the specified name is 659 // found the index to the first method is returned, and 'end' is filled in 660 // with the index of first non-name-matching method. If no method is found 661 // -1 is returned. 662 int find_method_by_name(const Symbol* name, int* end) const; 663 static int find_method_by_name(const Array<Method*>* methods, 664 const Symbol* name, int* end); 665 666 // constant pool 667 ConstantPool* constants() const { return _constants; } 668 void set_constants(ConstantPool* c) { _constants = c; } 669 670 // protection domain 671 oop protection_domain() const; 672 673 // signers 674 objArrayOop signers() const; 675 676 // host class 677 InstanceKlass* host_klass() const { 678 InstanceKlass** hk = adr_host_klass(); 679 if (hk == NULL) { 680 assert(!is_anonymous(), "Anonymous classes have host klasses"); 681 return NULL; 682 } else { 683 assert(*hk != NULL, "host klass should always be set if the address is not null"); 684 assert(is_anonymous(), "Only anonymous classes have host klasses"); 685 return *hk; 686 } 687 } 688 void set_host_klass(const InstanceKlass* host) { 689 assert(is_anonymous(), "not anonymous"); 690 const InstanceKlass** addr = (const InstanceKlass **)adr_host_klass(); 691 assert(addr != NULL, "no reversed space"); 692 if (addr != NULL) { 693 *addr = host; 694 } 695 } 696 bool has_host_klass() const { 697 return adr_host_klass() != NULL; 698 } 699 bool is_anonymous() const { 700 return (_misc_flags & _misc_is_anonymous) != 0; 701 } 702 void set_is_anonymous(bool value) { 703 if (value) { 704 _misc_flags |= _misc_is_anonymous; 705 } else { 706 _misc_flags &= ~_misc_is_anonymous; 707 } 708 } 709 710 // Oop that keeps the metadata for this class from being unloaded 711 // in places where the metadata is stored in other places, like nmethods 712 oop klass_holder() const { 713 return is_anonymous() ? java_mirror() : class_loader(); 714 } 715 716 // Load the klass_holder as a phantom. This is useful when a weak Klass 717 // pointer has been "peeked" and then must be kept alive before it may 718 // be used safely. 719 oop klass_holder_phantom(); 720 721 bool is_contended() const { 722 return (_misc_flags & _misc_is_contended) != 0; 723 } 724 void set_is_contended(bool value) { 725 if (value) { 726 _misc_flags |= _misc_is_contended; 727 } else { 728 _misc_flags &= ~_misc_is_contended; 729 } 730 } 731 732 // source file name 733 Symbol* source_file_name() const { 734 return (_source_file_name_index == 0) ? 735 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index); 736 } 737 u2 source_file_name_index() const { 738 return _source_file_name_index; 739 } 740 void set_source_file_name_index(u2 sourcefile_index) { 741 _source_file_name_index = sourcefile_index; 742 } 743 744 // minor and major version numbers of class file 745 u2 minor_version() const { return _minor_version; } 746 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 747 u2 major_version() const { return _major_version; } 748 void set_major_version(u2 major_version) { _major_version = major_version; } 749 750 // source debug extension 751 const char* source_debug_extension() const { return _source_debug_extension; } 752 void set_source_debug_extension(const char* array, int length); 753 754 // symbol unloading support (refcount already added) 755 Symbol* array_name() { return _array_name; } 756 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; } 757 758 // nonstatic oop-map blocks 759 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 760 return oop_map_count * OopMapBlock::size_in_words(); 761 } 762 unsigned int nonstatic_oop_map_count() const { 763 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 764 } 765 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 766 void set_nonstatic_oop_map_size(int words) { 767 _nonstatic_oop_map_size = words; 768 } 769 770 #if INCLUDE_JVMTI 771 // Redefinition locking. Class can only be redefined by one thread at a time. 772 bool is_being_redefined() const { 773 return (_extra_flags & _extra_is_being_redefined); 774 } 775 void set_is_being_redefined(bool value) { 776 if (value) { 777 _extra_flags |= _extra_is_being_redefined; 778 } else { 779 _extra_flags &= ~_extra_is_being_redefined; 780 } 781 } 782 783 // RedefineClasses() support for previous versions: 784 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 785 void purge_previous_version_list(); 786 787 InstanceKlass* previous_versions() const { return _previous_versions; } 788 #else 789 InstanceKlass* previous_versions() const { return NULL; } 790 #endif 791 792 InstanceKlass* get_klass_version(int version) { 793 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 794 if (ik->constants()->version() == version) { 795 return ik; 796 } 797 } 798 return NULL; 799 } 800 801 bool has_been_redefined() const { 802 return (_misc_flags & _misc_has_been_redefined) != 0; 803 } 804 void set_has_been_redefined() { 805 _misc_flags |= _misc_has_been_redefined; 806 } 807 808 bool has_passed_fingerprint_check() const { 809 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0; 810 } 811 void set_has_passed_fingerprint_check(bool b) { 812 if (b) { 813 _misc_flags |= _misc_has_passed_fingerprint_check; 814 } else { 815 _misc_flags &= ~_misc_has_passed_fingerprint_check; 816 } 817 } 818 bool supers_have_passed_fingerprint_checks(); 819 820 static bool should_store_fingerprint(bool is_anonymous); 821 bool should_store_fingerprint() const { return should_store_fingerprint(is_anonymous()); } 822 bool has_stored_fingerprint() const; 823 uint64_t get_stored_fingerprint() const; 824 void store_fingerprint(uint64_t fingerprint); 825 826 bool is_scratch_class() const { 827 return (_misc_flags & _misc_is_scratch_class) != 0; 828 } 829 830 void set_is_scratch_class() { 831 _misc_flags |= _misc_is_scratch_class; 832 } 833 834 bool has_resolved_methods() const { 835 return (_extra_flags & _extra_has_resolved_methods) != 0; 836 } 837 838 void set_has_resolved_methods() { 839 _extra_flags |= _extra_has_resolved_methods; 840 } 841 private: 842 843 void set_kind(unsigned kind) { 844 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind"); 845 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos; 846 unsigned flags = _misc_flags & ~fmask; 847 _misc_flags = (flags | (kind << _misc_kind_field_pos)); 848 } 849 850 bool is_kind(unsigned desired) const { 851 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask; 852 return kind == desired; 853 } 854 855 public: 856 857 // Other is anything that is not one of the more specialized kinds of InstanceKlass. 858 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); } 859 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); } 860 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); } 861 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); } 862 bool is_value_type_klass() const { return is_kind(_misc_kind_value_type); } 863 864 #if INCLUDE_JVMTI 865 866 void init_previous_versions() { 867 _previous_versions = NULL; 868 } 869 870 private: 871 static bool _has_previous_versions; 872 public: 873 static void purge_previous_versions(InstanceKlass* ik) { 874 if (ik->has_been_redefined()) { 875 ik->purge_previous_version_list(); 876 } 877 } 878 879 static bool has_previous_versions_and_reset(); 880 881 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 882 void set_cached_class_file(JvmtiCachedClassFileData *data) { 883 _cached_class_file = data; 884 } 885 JvmtiCachedClassFileData * get_cached_class_file(); 886 jint get_cached_class_file_len(); 887 unsigned char * get_cached_class_file_bytes(); 888 889 // JVMTI: Support for caching of field indices, types, and offsets 890 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 891 _jvmti_cached_class_field_map = descriptor; 892 } 893 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 894 return _jvmti_cached_class_field_map; 895 } 896 897 #if INCLUDE_CDS 898 void set_archived_class_data(JvmtiCachedClassFileData* data) { 899 _cached_class_file = data; 900 } 901 902 JvmtiCachedClassFileData * get_archived_class_data(); 903 #endif // INCLUDE_CDS 904 #else // INCLUDE_JVMTI 905 906 static void purge_previous_versions(InstanceKlass* ik) { return; }; 907 static bool has_previous_versions_and_reset() { return false; } 908 909 void set_cached_class_file(JvmtiCachedClassFileData *data) { 910 assert(data == NULL, "unexpected call with JVMTI disabled"); 911 } 912 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; } 913 914 #endif // INCLUDE_JVMTI 915 916 bool has_nonstatic_concrete_methods() const { 917 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0; 918 } 919 void set_has_nonstatic_concrete_methods(bool b) { 920 if (b) { 921 _misc_flags |= _misc_has_nonstatic_concrete_methods; 922 } else { 923 _misc_flags &= ~_misc_has_nonstatic_concrete_methods; 924 } 925 } 926 927 bool declares_nonstatic_concrete_methods() const { 928 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0; 929 } 930 void set_declares_nonstatic_concrete_methods(bool b) { 931 if (b) { 932 _misc_flags |= _misc_declares_nonstatic_concrete_methods; 933 } else { 934 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods; 935 } 936 } 937 938 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 939 inline u2 next_method_idnum(); 940 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 941 942 // generics support 943 Symbol* generic_signature() const { 944 return (_generic_signature_index == 0) ? 945 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index); 946 } 947 u2 generic_signature_index() const { 948 return _generic_signature_index; 949 } 950 void set_generic_signature_index(u2 sig_index) { 951 _generic_signature_index = sig_index; 952 } 953 954 u2 enclosing_method_data(int offset) const; 955 u2 enclosing_method_class_index() const { 956 return enclosing_method_data(enclosing_method_class_index_offset); 957 } 958 u2 enclosing_method_method_index() { 959 return enclosing_method_data(enclosing_method_method_index_offset); 960 } 961 void set_enclosing_method_indices(u2 class_index, 962 u2 method_index); 963 964 // jmethodID support 965 jmethodID get_jmethod_id(const methodHandle& method_h); 966 jmethodID get_jmethod_id_fetch_or_update(size_t idnum, 967 jmethodID new_id, jmethodID* new_jmeths, 968 jmethodID* to_dealloc_id_p, 969 jmethodID** to_dealloc_jmeths_p); 970 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 971 size_t *length_p, jmethodID* id_p); 972 void ensure_space_for_methodids(int start_offset = 0); 973 jmethodID jmethod_id_or_null(Method* method); 974 975 // annotations support 976 Annotations* annotations() const { return _annotations; } 977 void set_annotations(Annotations* anno) { _annotations = anno; } 978 979 AnnotationArray* class_annotations() const { 980 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 981 } 982 Array<AnnotationArray*>* fields_annotations() const { 983 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 984 } 985 AnnotationArray* class_type_annotations() const { 986 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 987 } 988 Array<AnnotationArray*>* fields_type_annotations() const { 989 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 990 } 991 // allocation 992 instanceOop allocate_instance(TRAPS); 993 994 // additional member function to return a handle 995 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } 996 997 objArrayOop allocate_objArray(int n, int length, TRAPS); 998 // Helper function 999 static instanceOop register_finalizer(instanceOop i, TRAPS); 1000 1001 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 1002 // if not, throw either an Error or an Exception. 1003 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 1004 1005 // initialization 1006 void call_class_initializer(TRAPS); 1007 void set_initialization_state_and_notify(ClassState state, TRAPS); 1008 1009 // OopMapCache support 1010 OopMapCache* oop_map_cache() { return _oop_map_cache; } 1011 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 1012 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 1013 1014 // JNI identifier support (for static fields - for jni performance) 1015 JNIid* jni_ids() { return _jni_ids; } 1016 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 1017 JNIid* jni_id_for(int offset); 1018 1019 // maintenance of deoptimization dependencies 1020 inline DependencyContext dependencies(); 1021 int mark_dependent_nmethods(KlassDepChange& changes); 1022 void add_dependent_nmethod(nmethod* nm); 1023 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately); 1024 1025 // On-stack replacement support 1026 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 1027 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 1028 void add_osr_nmethod(nmethod* n); 1029 bool remove_osr_nmethod(nmethod* n); 1030 int mark_osr_nmethods(const Method* m); 1031 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 1032 1033 #if INCLUDE_JVMTI 1034 // Breakpoint support (see methods on Method* for details) 1035 BreakpointInfo* breakpoints() const { return _breakpoints; }; 1036 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 1037 #endif 1038 1039 // support for stub routines 1040 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 1041 TRACE_DEFINE_KLASS_TRACE_ID_OFFSET; 1042 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 1043 1044 // subclass/subinterface checks 1045 bool implements_interface(Klass* k) const; 1046 bool is_same_or_direct_interface(Klass* k) const; 1047 1048 #ifdef ASSERT 1049 // check whether this class or one of its superclasses was redefined 1050 bool has_redefined_this_or_super() const; 1051 #endif 1052 1053 // Access to the implementor of an interface. 1054 Klass* implementor() const 1055 { 1056 Klass** k = adr_implementor(); 1057 if (k == NULL) { 1058 return NULL; 1059 } else { 1060 return *k; 1061 } 1062 } 1063 1064 void set_implementor(Klass* k) { 1065 assert(is_interface(), "not interface"); 1066 Klass** addr = adr_implementor(); 1067 assert(addr != NULL, "null addr"); 1068 if (addr != NULL) { 1069 *addr = k; 1070 } 1071 } 1072 1073 int nof_implementors() const { 1074 Klass* k = implementor(); 1075 if (k == NULL) { 1076 return 0; 1077 } else if (k != this) { 1078 return 1; 1079 } else { 1080 return 2; 1081 } 1082 } 1083 1084 void add_implementor(Klass* k); // k is a new class that implements this interface 1085 void init_implementor(); // initialize 1086 1087 // link this class into the implementors list of every interface it implements 1088 void process_interfaces(Thread *thread); 1089 1090 // virtual operations from Klass 1091 bool is_leaf_class() const { return _subklass == NULL; } 1092 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); 1093 bool compute_is_subtype_of(Klass* k); 1094 bool can_be_primary_super_slow() const; 1095 int oop_size(oop obj) const { return size_helper(); } 1096 // slow because it's a virtual call and used for verifying the layout_helper. 1097 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 1098 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 1099 1100 // Iterators 1101 void do_local_static_fields(FieldClosure* cl); 1102 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 1103 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 1104 1105 void methods_do(void f(Method* method)); 1106 void array_klasses_do(void f(Klass* k)); 1107 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 1108 bool super_types_do(SuperTypeClosure* blk); 1109 1110 static InstanceKlass* cast(Klass* k) { 1111 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 1112 } 1113 1114 static const InstanceKlass* cast(const Klass* k) { 1115 assert(k != NULL, "k should not be null"); 1116 assert(k->is_instance_klass(), "cast to InstanceKlass"); 1117 return static_cast<const InstanceKlass*>(k); 1118 } 1119 1120 InstanceKlass* java_super() const { 1121 return (super() == NULL) ? NULL : cast(super()); 1122 } 1123 1124 // Sizing (in words) 1125 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 1126 1127 static int size(int vtable_length, int itable_length, 1128 int nonstatic_oop_map_size, 1129 bool is_interface, bool is_anonymous, bool has_stored_fingerprint, 1130 int java_fields, bool is_value_type) { 1131 return align_metadata_size(header_size() + 1132 vtable_length + 1133 itable_length + 1134 nonstatic_oop_map_size + 1135 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) + 1136 (is_anonymous ? (int)sizeof(Klass*)/wordSize : 0) + 1137 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0) + 1138 (java_fields * (int)sizeof(Klass*)/wordSize) + 1139 (is_value_type ? (int)sizeof(ValueKlassFixedBlock) : 0)); 1140 } 1141 int size() const { return size(vtable_length(), 1142 itable_length(), 1143 nonstatic_oop_map_size(), 1144 is_interface(), 1145 is_anonymous(), 1146 has_stored_fingerprint(), 1147 has_value_fields() ? java_fields_count() : 0, 1148 is_value()); 1149 } 1150 #if INCLUDE_SERVICES 1151 virtual void collect_statistics(KlassSizeStats *sz) const; 1152 #endif 1153 1154 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); } 1155 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 1156 1157 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 1158 1159 address static_field_addr(int offset); 1160 1161 bool bounds_check(address addr, bool edge_ok = false, intptr_t size_in_bytes = -1) const PRODUCT_RETURN0; 1162 1163 OopMapBlock* start_of_nonstatic_oop_maps() const { 1164 return (OopMapBlock*)(start_of_itable() + itable_length()); 1165 } 1166 1167 Klass** end_of_nonstatic_oop_maps() const { 1168 return (Klass**)(start_of_nonstatic_oop_maps() + 1169 nonstatic_oop_map_count()); 1170 } 1171 1172 Klass** adr_implementor() const { 1173 if (is_interface()) { 1174 return (Klass**)end_of_nonstatic_oop_maps(); 1175 } else { 1176 return NULL; 1177 } 1178 }; 1179 1180 InstanceKlass** adr_host_klass() const { 1181 if (is_anonymous()) { 1182 InstanceKlass** adr_impl = (InstanceKlass **)adr_implementor(); 1183 if (adr_impl != NULL) { 1184 return adr_impl + 1; 1185 } else { 1186 return (InstanceKlass **)end_of_nonstatic_oop_maps(); 1187 } 1188 } else { 1189 return NULL; 1190 } 1191 } 1192 1193 address adr_fingerprint() const { 1194 if (has_stored_fingerprint()) { 1195 InstanceKlass** adr_host = adr_host_klass(); 1196 if (adr_host != NULL) { 1197 return (address)(adr_host + 1); 1198 } 1199 1200 Klass** adr_impl = adr_implementor(); 1201 if (adr_impl != NULL) { 1202 return (address)(adr_impl + 1); 1203 } 1204 1205 return (address)end_of_nonstatic_oop_maps(); 1206 } else { 1207 return NULL; 1208 } 1209 } 1210 1211 address adr_value_fields_klasses() const { 1212 if (has_value_fields()) { 1213 address adr_fing = adr_fingerprint(); 1214 if (adr_fing != NULL) { 1215 return adr_fingerprint() + sizeof(u8); 1216 } 1217 1218 InstanceKlass** adr_host = adr_host_klass(); 1219 if (adr_host != NULL) { 1220 return (address)(adr_host + 1); 1221 } 1222 1223 Klass** adr_impl = adr_implementor(); 1224 if (adr_impl != NULL) { 1225 return (address)(adr_impl + 1); 1226 } 1227 1228 return (address)end_of_nonstatic_oop_maps(); 1229 } else { 1230 return NULL; 1231 } 1232 } 1233 1234 Klass* get_value_field_klass(int idx) const { 1235 assert(has_value_fields(), "Sanity checking"); 1236 Klass* k = ((Klass**)adr_value_fields_klasses())[idx]; 1237 assert(k != NULL, "Should always be set before being read"); 1238 assert(k->is_value(), "Must be a value type"); 1239 return k; 1240 } 1241 1242 Klass* get_value_field_klass_or_null(int idx) const { 1243 assert(has_value_fields(), "Sanity checking"); 1244 Klass* k = ((Klass**)adr_value_fields_klasses())[idx]; 1245 assert(k == NULL || k->is_value(), "Must be a value type"); 1246 return k; 1247 } 1248 1249 void set_value_field_klass(int idx, Klass* k) { 1250 assert(has_value_fields(), "Sanity checking"); 1251 assert(k != NULL, "Should not be set to NULL"); 1252 assert(((Klass**)adr_value_fields_klasses())[idx] == NULL, "Should not be set twice"); 1253 ((Klass**)adr_value_fields_klasses())[idx] = k; 1254 } 1255 1256 // Use this to return the size of an instance in heap words: 1257 virtual int size_helper() const { 1258 return layout_helper_to_size_helper(layout_helper()); 1259 } 1260 1261 // This bit is initialized in classFileParser.cpp. 1262 // It is false under any of the following conditions: 1263 // - the class is abstract (including any interface) 1264 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1265 // - the class size is larger than FastAllocateSizeLimit 1266 // - the class is java/lang/Class, which cannot be allocated directly 1267 bool can_be_fastpath_allocated() const { 1268 return !layout_helper_needs_slow_path(layout_helper()); 1269 } 1270 1271 // Java itable 1272 klassItable itable() const; // return klassItable wrapper 1273 Method* method_at_itable(Klass* holder, int index, TRAPS); 1274 1275 #if INCLUDE_JVMTI 1276 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed); 1277 #endif // INCLUDE_JVMTI 1278 1279 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive); 1280 void clean_implementors_list(BoolObjectClosure* is_alive); 1281 void clean_method_data(BoolObjectClosure* is_alive); 1282 1283 // Explicit metaspace deallocation of fields 1284 // For RedefineClasses and class file parsing errors, we need to deallocate 1285 // instanceKlasses and the metadata they point to. 1286 void deallocate_contents(ClassLoaderData* loader_data); 1287 static void deallocate_methods(ClassLoaderData* loader_data, 1288 Array<Method*>* methods); 1289 void static deallocate_interfaces(ClassLoaderData* loader_data, 1290 const Klass* super_klass, 1291 Array<Klass*>* local_interfaces, 1292 Array<Klass*>* transitive_interfaces); 1293 1294 // The constant pool is on stack if any of the methods are executing or 1295 // referenced by handles. 1296 bool on_stack() const { return _constants->on_stack(); } 1297 1298 // callbacks for actions during class unloading 1299 static void notify_unload_class(InstanceKlass* ik); 1300 static void release_C_heap_structures(InstanceKlass* ik); 1301 1302 // Naming 1303 const char* signature_name() const; 1304 static Symbol* package_from_name(const Symbol* name, TRAPS); 1305 1306 // GC specific object visitors 1307 // 1308 #if INCLUDE_ALL_GCS 1309 // Parallel Scavenge 1310 void oop_ps_push_contents( oop obj, PSPromotionManager* pm); 1311 // Parallel Compact 1312 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm); 1313 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm); 1314 #endif 1315 1316 // Oop fields (and metadata) iterators 1317 // [nv = true] Use non-virtual calls to do_oop_nv. 1318 // [nv = false] Use virtual calls to do_oop. 1319 // 1320 // The InstanceKlass iterators also visits the Object's klass. 1321 1322 // Forward iteration 1323 public: 1324 // Iterate over all oop fields in the oop maps. 1325 template <bool nv, class OopClosureType> 1326 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1327 1328 protected: 1329 // Iterate over all oop fields and metadata. 1330 template <bool nv, class OopClosureType> 1331 inline int oop_oop_iterate(oop obj, OopClosureType* closure); 1332 1333 private: 1334 // Iterate over all oop fields in the oop maps. 1335 // Specialized for [T = oop] or [T = narrowOop]. 1336 template <bool nv, typename T, class OopClosureType> 1337 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure); 1338 1339 // Iterate over all oop fields in one oop map. 1340 template <bool nv, typename T, class OopClosureType> 1341 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1342 1343 1344 // Reverse iteration 1345 #if INCLUDE_ALL_GCS 1346 public: 1347 // Iterate over all oop fields in the oop maps. 1348 template <bool nv, class OopClosureType> 1349 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1350 1351 protected: 1352 // Iterate over all oop fields and metadata. 1353 template <bool nv, class OopClosureType> 1354 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1355 1356 private: 1357 // Iterate over all oop fields in the oop maps. 1358 // Specialized for [T = oop] or [T = narrowOop]. 1359 template <bool nv, typename T, class OopClosureType> 1360 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure); 1361 1362 // Iterate over all oop fields in one oop map. 1363 template <bool nv, typename T, class OopClosureType> 1364 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1365 #endif 1366 1367 1368 // Bounded range iteration 1369 public: 1370 // Iterate over all oop fields in the oop maps. 1371 template <bool nv, class OopClosureType> 1372 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1373 1374 protected: 1375 // Iterate over all oop fields and metadata. 1376 template <bool nv, class OopClosureType> 1377 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1378 1379 private: 1380 // Iterate over all oop fields in the oop maps. 1381 // Specialized for [T = oop] or [T = narrowOop]. 1382 template <bool nv, typename T, class OopClosureType> 1383 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1384 1385 // Iterate over all oop fields in one oop map. 1386 template <bool nv, typename T, class OopClosureType> 1387 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1388 1389 1390 public: 1391 1392 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL) 1393 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL) 1394 1395 #if INCLUDE_ALL_GCS 1396 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS) 1397 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS) 1398 #endif // INCLUDE_ALL_GCS 1399 1400 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1401 1402 public: 1403 void set_in_error_state() { 1404 assert(DumpSharedSpaces, "only call this when dumping archive"); 1405 _init_state = initialization_error; 1406 } 1407 bool check_sharing_error_state(); 1408 1409 private: 1410 // initialization state 1411 #ifdef ASSERT 1412 void set_init_state(ClassState state); 1413 #else 1414 void set_init_state(ClassState state) { _init_state = (u1)state; } 1415 #endif 1416 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1417 void set_init_thread(Thread *thread) { _init_thread = thread; } 1418 1419 // The RedefineClasses() API can cause new method idnums to be needed 1420 // which will cause the caches to grow. Safety requires different 1421 // cache management logic if the caches can grow instead of just 1422 // going from NULL to non-NULL. 1423 bool idnum_can_increment() const { return has_been_redefined(); } 1424 inline jmethodID* methods_jmethod_ids_acquire() const; 1425 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1426 1427 // Lock during initialization 1428 public: 1429 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1430 // Must be one per class and it has to be a VM internal object so java code 1431 // cannot lock it (like the mirror). 1432 // It has to be an object not a Mutex because it's held through java calls. 1433 oop init_lock() const; 1434 private: 1435 void fence_and_clear_init_lock(); 1436 1437 bool link_class_impl (bool throw_verifyerror, TRAPS); 1438 bool verify_code (bool throw_verifyerror, TRAPS); 1439 void initialize_impl (TRAPS); 1440 void initialize_super_interfaces (TRAPS); 1441 void eager_initialize_impl (); 1442 /* jni_id_for_impl for jfieldID only */ 1443 JNIid* jni_id_for_impl (int offset); 1444 protected: 1445 // Returns the array class for the n'th dimension 1446 virtual Klass* array_klass_impl(bool or_null, int n, TRAPS); 1447 1448 // Returns the array class with this class as element type 1449 virtual Klass* array_klass_impl(bool or_null, TRAPS); 1450 1451 private: 1452 1453 // find a local method (returns NULL if not found) 1454 Method* find_method_impl(const Symbol* name, 1455 const Symbol* signature, 1456 OverpassLookupMode overpass_mode, 1457 StaticLookupMode static_mode, 1458 PrivateLookupMode private_mode) const; 1459 1460 static Method* find_method_impl(const Array<Method*>* methods, 1461 const Symbol* name, 1462 const Symbol* signature, 1463 OverpassLookupMode overpass_mode, 1464 StaticLookupMode static_mode, 1465 PrivateLookupMode private_mode); 1466 1467 // Free CHeap allocated fields. 1468 void release_C_heap_structures(); 1469 1470 #if INCLUDE_JVMTI 1471 // RedefineClasses support 1472 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1473 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1474 #endif 1475 public: 1476 // CDS support - remove and restore oops from metadata. Oops are not shared. 1477 virtual void remove_unshareable_info(); 1478 virtual void remove_java_mirror(); 1479 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 1480 1481 // jvm support 1482 jint compute_modifier_flags(TRAPS) const; 1483 1484 public: 1485 // JVMTI support 1486 jint jvmti_class_status() const; 1487 1488 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 1489 1490 public: 1491 // Printing 1492 #ifndef PRODUCT 1493 void print_on(outputStream* st) const; 1494 #endif 1495 void print_value_on(outputStream* st) const; 1496 1497 void oop_print_value_on(oop obj, outputStream* st); 1498 1499 #ifndef PRODUCT 1500 void oop_print_on (oop obj, outputStream* st); 1501 1502 void print_dependent_nmethods(bool verbose = false); 1503 bool is_dependent_nmethod(nmethod* nm); 1504 #endif 1505 1506 const char* internal_name() const; 1507 1508 // Verification 1509 void verify_on(outputStream* st); 1510 1511 void oop_verify_on(oop obj, outputStream* st); 1512 1513 // Logging 1514 void print_class_load_logging(ClassLoaderData* loader_data, 1515 const char* module_name, 1516 const ClassFileStream* cfs) const; 1517 }; 1518 1519 // for adding methods 1520 // UNSET_IDNUM return means no more ids available 1521 inline u2 InstanceKlass::next_method_idnum() { 1522 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1523 return ConstMethod::UNSET_IDNUM; // no more ids available 1524 } else { 1525 return _idnum_allocated_count++; 1526 } 1527 } 1528 1529 1530 /* JNIid class for jfieldIDs only */ 1531 class JNIid: public CHeapObj<mtClass> { 1532 friend class VMStructs; 1533 private: 1534 Klass* _holder; 1535 JNIid* _next; 1536 int _offset; 1537 #ifdef ASSERT 1538 bool _is_static_field_id; 1539 #endif 1540 1541 public: 1542 // Accessors 1543 Klass* holder() const { return _holder; } 1544 int offset() const { return _offset; } 1545 JNIid* next() { return _next; } 1546 // Constructor 1547 JNIid(Klass* holder, int offset, JNIid* next); 1548 // Identifier lookup 1549 JNIid* find(int offset); 1550 1551 bool find_local_field(fieldDescriptor* fd) { 1552 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1553 } 1554 1555 static void deallocate(JNIid* id); 1556 // Debugging 1557 #ifdef ASSERT 1558 bool is_static_field_id() const { return _is_static_field_id; } 1559 void set_is_static_field_id() { _is_static_field_id = true; } 1560 #endif 1561 void verify(Klass* holder); 1562 }; 1563 1564 // An iterator that's used to access the inner classes indices in the 1565 // InstanceKlass::_inner_classes array. 1566 class InnerClassesIterator : public StackObj { 1567 private: 1568 Array<jushort>* _inner_classes; 1569 int _length; 1570 int _idx; 1571 public: 1572 1573 InnerClassesIterator(const InstanceKlass* k) { 1574 _inner_classes = k->inner_classes(); 1575 if (k->inner_classes() != NULL) { 1576 _length = _inner_classes->length(); 1577 // The inner class array's length should be the multiple of 1578 // inner_class_next_offset if it only contains the InnerClasses 1579 // attribute data, or it should be 1580 // n*inner_class_next_offset+enclosing_method_attribute_size 1581 // if it also contains the EnclosingMethod data. 1582 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1583 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1584 "just checking"); 1585 // Remove the enclosing_method portion if exists. 1586 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1587 _length -= InstanceKlass::enclosing_method_attribute_size; 1588 } 1589 } else { 1590 _length = 0; 1591 } 1592 _idx = 0; 1593 } 1594 1595 int length() const { 1596 return _length; 1597 } 1598 1599 void next() { 1600 _idx += InstanceKlass::inner_class_next_offset; 1601 } 1602 1603 bool done() const { 1604 return (_idx >= _length); 1605 } 1606 1607 u2 inner_class_info_index() const { 1608 return _inner_classes->at( 1609 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1610 } 1611 1612 void set_inner_class_info_index(u2 index) { 1613 _inner_classes->at_put( 1614 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1615 } 1616 1617 u2 outer_class_info_index() const { 1618 return _inner_classes->at( 1619 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1620 } 1621 1622 void set_outer_class_info_index(u2 index) { 1623 _inner_classes->at_put( 1624 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1625 } 1626 1627 u2 inner_name_index() const { 1628 return _inner_classes->at( 1629 _idx + InstanceKlass::inner_class_inner_name_offset); 1630 } 1631 1632 void set_inner_name_index(u2 index) { 1633 _inner_classes->at_put( 1634 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1635 } 1636 1637 u2 inner_access_flags() const { 1638 return _inner_classes->at( 1639 _idx + InstanceKlass::inner_class_access_flags_offset); 1640 } 1641 }; 1642 1643 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP