1 /* 2 * Copyright (c) 1997, 2017, 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 "gc/shared/specialized_oop_closures.hpp" 33 #include "memory/referenceType.hpp" 34 #include "oops/annotations.hpp" 35 #include "oops/constMethod.hpp" 36 #include "oops/fieldInfo.hpp" 37 #include "oops/instanceOop.hpp" 38 #include "oops/klassVtable.hpp" 39 #include "runtime/handles.hpp" 40 #include "runtime/os.hpp" 41 #include "trace/traceMacros.hpp" 42 #include "utilities/accessFlags.hpp" 43 #include "utilities/macros.hpp" 44 45 // An InstanceKlass is the VM level representation of a Java class. 46 // It contains all information needed for at class at execution runtime. 47 48 // InstanceKlass embedded field layout (after declared fields): 49 // [EMBEDDED Java vtable ] size in words = vtable_len 50 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size 51 // The embedded nonstatic oop-map blocks are short pairs (offset, length) 52 // indicating where oops are located in instances of this klass. 53 // [EMBEDDED implementor of the interface] only exist for interface 54 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled) 55 // [EMBEDDED fingerprint ] only if should_store_fingerprint()==true 56 57 58 // forward declaration for class -- see below for definition 59 #if INCLUDE_JVMTI 60 class BreakpointInfo; 61 #endif 62 class ClassFileParser; 63 class KlassDepChange; 64 class DependencyContext; 65 class fieldDescriptor; 66 class jniIdMapBase; 67 class JNIid; 68 class JvmtiCachedClassFieldMap; 69 class SuperTypeClosure; 70 71 // This is used in iterators below. 72 class FieldClosure: public StackObj { 73 public: 74 virtual void do_field(fieldDescriptor* fd) = 0; 75 }; 76 77 #ifndef PRODUCT 78 // Print fields. 79 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. 80 class FieldPrinter: public FieldClosure { 81 oop _obj; 82 outputStream* _st; 83 public: 84 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} 85 void do_field(fieldDescriptor* fd); 86 }; 87 #endif // !PRODUCT 88 89 // ValueObjs embedded in klass. Describes where oops are located in instances of 90 // this klass. 91 class OopMapBlock VALUE_OBJ_CLASS_SPEC { 92 public: 93 // Byte offset of the first oop mapped by this block. 94 int offset() const { return _offset; } 95 void set_offset(int offset) { _offset = offset; } 96 97 // Number of oops in this block. 98 uint count() const { return _count; } 99 void set_count(uint count) { _count = count; } 100 101 // sizeof(OopMapBlock) in words. 102 static const int size_in_words() { 103 return align_size_up(int(sizeof(OopMapBlock)), wordSize) >> 104 LogBytesPerWord; 105 } 106 107 private: 108 int _offset; 109 uint _count; 110 }; 111 112 struct JvmtiCachedClassFileData; 113 114 class InstanceKlass: public Klass { 115 friend class VMStructs; 116 friend class JVMCIVMStructs; 117 friend class ClassFileParser; 118 friend class CompileReplay; 119 120 protected: 121 InstanceKlass(const ClassFileParser& parser, unsigned kind); 122 123 public: 124 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } 125 126 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 127 // of the class loading & initialization procedure, and the use of the states. 128 enum ClassState { 129 allocated, // allocated (but not yet linked) 130 loaded, // loaded and inserted in class hierarchy (but not linked yet) 131 linked, // successfully linked/verified (but not initialized yet) 132 being_initialized, // currently running class initializer 133 fully_initialized, // initialized (successfull final state) 134 initialization_error // error happened during initialization 135 }; 136 137 static int number_of_instance_classes() { return _total_instanceKlass_count; } 138 139 private: 140 static volatile int _total_instanceKlass_count; 141 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS); 142 143 protected: 144 // Annotations for this class 145 Annotations* _annotations; 146 // Package this class is defined in 147 PackageEntry* _package_entry; 148 // Array classes holding elements of this class. 149 Klass* volatile _array_klasses; 150 // Constant pool for this class. 151 ConstantPool* _constants; 152 // The InnerClasses attribute and EnclosingMethod attribute. The 153 // _inner_classes is an array of shorts. If the class has InnerClasses 154 // attribute, then the _inner_classes array begins with 4-tuples of shorts 155 // [inner_class_info_index, outer_class_info_index, 156 // inner_name_index, inner_class_access_flags] for the InnerClasses 157 // attribute. If the EnclosingMethod attribute exists, it occupies the 158 // last two shorts [class_index, method_index] of the array. If only 159 // the InnerClasses attribute exists, the _inner_classes array length is 160 // number_of_inner_classes * 4. If the class has both InnerClasses 161 // and EnclosingMethod attributes the _inner_classes array length is 162 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 163 Array<jushort>* _inner_classes; 164 165 // the source debug extension for this klass, NULL if not specified. 166 // Specified as UTF-8 string without terminating zero byte in the classfile, 167 // it is stored in the instanceklass as a NULL-terminated UTF-8 string 168 const char* _source_debug_extension; 169 // Array name derived from this class which needs unreferencing 170 // if this class is unloaded. 171 Symbol* _array_name; 172 173 // Number of heapOopSize words used by non-static fields in this klass 174 // (including inherited fields but after header_size()). 175 int _nonstatic_field_size; 176 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 177 // Constant pool index to the utf8 entry of the Generic signature, 178 // or 0 if none. 179 u2 _generic_signature_index; 180 // Constant pool index to the utf8 entry for the name of source file 181 // containing this klass, 0 if not specified. 182 u2 _source_file_name_index; 183 u2 _static_oop_field_count;// number of static oop fields in this klass 184 u2 _java_fields_count; // The number of declared Java fields 185 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 186 187 int _itable_len; // length of Java itable (in words) 188 // _is_marked_dependent can be set concurrently, thus cannot be part of the 189 // _misc_flags. 190 bool _is_marked_dependent; // used for marking during flushing and deoptimization 191 bool _is_being_redefined; // used for locking redefinition 192 193 // The low two bits of _misc_flags contains the kind field. 194 // This can be used to quickly discriminate among the four kinds of 195 // InstanceKlass. 196 197 static const unsigned _misc_kind_field_size = 2; 198 static const unsigned _misc_kind_field_pos = 0; 199 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u; 200 201 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass 202 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass 203 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass 204 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass 205 206 // Start after _misc_kind field. 207 enum { 208 _misc_rewritten = 1 << 2, // methods rewritten. 209 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops 210 _misc_should_verify_class = 1 << 4, // allow caching of preverification 211 _misc_is_anonymous = 1 << 5, // has embedded _host_klass field 212 _misc_is_contended = 1 << 6, // marked with contended annotation 213 _misc_has_nonstatic_concrete_methods = 1 << 7, // class/superclass/implemented interfaces has non-static, concrete methods 214 _misc_declares_nonstatic_concrete_methods = 1 << 8, // directly declares non-static, concrete methods 215 _misc_has_been_redefined = 1 << 9, // class has been redefined 216 _misc_has_passed_fingerprint_check = 1 << 10, // when this class was loaded, the fingerprint computed from its 217 // code source was found to be matching the value recorded by AOT. 218 _misc_is_scratch_class = 1 << 11, // class is the redefined scratch class 219 _misc_is_shared_boot_class = 1 << 12, // defining class loader is boot class loader 220 _misc_is_shared_platform_class = 1 << 13, // defining class loader is platform class loader 221 _misc_is_shared_app_class = 1 << 14, // defining class loader is app class loader 222 _misc_has_resolved_methods = 1 << 15 // resolved methods table entries added for this class 223 }; 224 u2 loader_type_bits() { 225 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class; 226 } 227 u2 _misc_flags; 228 u2 _minor_version; // minor version number of class file 229 u2 _major_version; // major version number of class file 230 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) 231 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 232 JNIid* _jni_ids; // First JNI identifier for static fields in this class 233 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 234 intptr_t _dep_context; // packed DependencyContext structure 235 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 236 #if INCLUDE_JVMTI 237 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 238 // Linked instanceKlasses of previous versions 239 InstanceKlass* _previous_versions; 240 // JVMTI fields can be moved to their own structure - see 6315920 241 // JVMTI: cached class file, before retransformable agent modified it in CFLH 242 JvmtiCachedClassFileData* _cached_class_file; 243 #endif 244 245 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 246 247 // Class states are defined as ClassState (see above). 248 // Place the _init_state here to utilize the unused 2-byte after 249 // _idnum_allocated_count. 250 u1 _init_state; // state of class 251 u1 _reference_type; // reference type 252 253 #if INCLUDE_JVMTI 254 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 255 #endif 256 257 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 258 259 // Method array. 260 Array<Method*>* _methods; 261 // Default Method Array, concrete methods inherited from interfaces 262 Array<Method*>* _default_methods; 263 // Interface (Klass*s) this class declares locally to implement. 264 Array<Klass*>* _local_interfaces; 265 // Interface (Klass*s) this class implements transitively. 266 Array<Klass*>* _transitive_interfaces; 267 // Int array containing the original order of method in the class file (for JVMTI). 268 Array<int>* _method_ordering; 269 // Int array containing the vtable_indices for default_methods 270 // offset matches _default_methods offset 271 Array<int>* _default_vtable_indices; 272 273 // Instance and static variable information, starts with 6-tuples of shorts 274 // [access, name index, sig index, initval index, low_offset, high_offset] 275 // for all fields, followed by the generic signature data at the end of 276 // the array. Only fields with generic signature attributes have the generic 277 // signature data set in the array. The fields array looks like following: 278 // 279 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 280 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 281 // ... 282 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 283 // [generic signature index] 284 // [generic signature index] 285 // ... 286 Array<u2>* _fields; 287 288 // embedded Java vtable follows here 289 // embedded Java itables follows here 290 // embedded static fields follows here 291 // embedded nonstatic oop-map blocks follows here 292 // embedded implementor of this interface follows here 293 // The embedded implementor only exists if the current klass is an 294 // iterface. The possible values of the implementor fall into following 295 // three cases: 296 // NULL: no implementor. 297 // A Klass* that's not itself: one implementor. 298 // Itself: more than one implementors. 299 // embedded host klass follows here 300 // The embedded host klass only exists in an anonymous class for 301 // dynamic language support (JSR 292 enabled). The host class grants 302 // its access privileges to this class also. The host class is either 303 // named, or a previously loaded anonymous class. A non-anonymous class 304 // or an anonymous class loaded through normal classloading does not 305 // have this embedded field. 306 // 307 308 friend class SystemDictionary; 309 310 public: 311 u2 loader_type() { 312 return _misc_flags & loader_type_bits(); 313 } 314 315 bool is_shared_boot_class() const { 316 return (_misc_flags & _misc_is_shared_boot_class) != 0; 317 } 318 bool is_shared_platform_class() const { 319 return (_misc_flags & _misc_is_shared_platform_class) != 0; 320 } 321 bool is_shared_app_class() const { 322 return (_misc_flags & _misc_is_shared_app_class) != 0; 323 } 324 325 void set_class_loader_type(s2 loader_type) { 326 assert(( _misc_flags & loader_type_bits()) == 0, 327 "Should only be called once for each class."); 328 switch (loader_type) { 329 case ClassLoader::BOOT_LOADER: 330 _misc_flags |= _misc_is_shared_boot_class; 331 break; 332 case ClassLoader::PLATFORM_LOADER: 333 _misc_flags |= _misc_is_shared_platform_class; 334 break; 335 case ClassLoader::APP_LOADER: 336 _misc_flags |= _misc_is_shared_app_class; 337 break; 338 default: 339 ShouldNotReachHere(); 340 break; 341 } 342 } 343 344 bool has_nonstatic_fields() const { 345 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 346 } 347 void set_has_nonstatic_fields(bool b) { 348 if (b) { 349 _misc_flags |= _misc_has_nonstatic_fields; 350 } else { 351 _misc_flags &= ~_misc_has_nonstatic_fields; 352 } 353 } 354 355 // field sizes 356 int nonstatic_field_size() const { return _nonstatic_field_size; } 357 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 358 359 int static_field_size() const { return _static_field_size; } 360 void set_static_field_size(int size) { _static_field_size = size; } 361 362 int static_oop_field_count() const { return (int)_static_oop_field_count; } 363 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 364 365 // Java itable 366 int itable_length() const { return _itable_len; } 367 void set_itable_length(int len) { _itable_len = len; } 368 369 // array klasses 370 Klass* array_klasses() const { return _array_klasses; } 371 inline Klass* array_klasses_acquire() const; // load with acquire semantics 372 void set_array_klasses(Klass* k) { _array_klasses = k; } 373 inline void release_set_array_klasses(Klass* k); // store with release semantics 374 375 // methods 376 Array<Method*>* methods() const { return _methods; } 377 void set_methods(Array<Method*>* a) { _methods = a; } 378 Method* method_with_idnum(int idnum); 379 Method* method_with_orig_idnum(int idnum); 380 Method* method_with_orig_idnum(int idnum, int version); 381 382 // method ordering 383 Array<int>* method_ordering() const { return _method_ordering; } 384 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 385 void copy_method_ordering(const intArray* m, TRAPS); 386 387 // default_methods 388 Array<Method*>* default_methods() const { return _default_methods; } 389 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 390 391 // default method vtable_indices 392 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 393 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 394 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 395 396 // interfaces 397 Array<Klass*>* local_interfaces() const { return _local_interfaces; } 398 void set_local_interfaces(Array<Klass*>* a) { 399 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 400 _local_interfaces = a; } 401 402 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; } 403 void set_transitive_interfaces(Array<Klass*>* a) { 404 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 405 _transitive_interfaces = a; 406 } 407 408 private: 409 friend class fieldDescriptor; 410 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 411 412 public: 413 int field_offset (int index) const { return field(index)->offset(); } 414 int field_access_flags(int index) const { return field(index)->access_flags(); } 415 Symbol* field_name (int index) const { return field(index)->name(constants()); } 416 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 417 418 // Number of Java declared fields 419 int java_fields_count() const { return (int)_java_fields_count; } 420 421 Array<u2>* fields() const { return _fields; } 422 void set_fields(Array<u2>* f, u2 java_fields_count) { 423 guarantee(_fields == NULL || f == NULL, "Just checking"); 424 _fields = f; 425 _java_fields_count = java_fields_count; 426 } 427 428 // inner classes 429 Array<u2>* inner_classes() const { return _inner_classes; } 430 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 431 432 enum InnerClassAttributeOffset { 433 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 434 inner_class_inner_class_info_offset = 0, 435 inner_class_outer_class_info_offset = 1, 436 inner_class_inner_name_offset = 2, 437 inner_class_access_flags_offset = 3, 438 inner_class_next_offset = 4 439 }; 440 441 enum EnclosingMethodAttributeOffset { 442 enclosing_method_class_index_offset = 0, 443 enclosing_method_method_index_offset = 1, 444 enclosing_method_attribute_size = 2 445 }; 446 447 // method override check 448 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 449 450 // package 451 PackageEntry* package() const { return _package_entry; } 452 ModuleEntry* module() const; 453 bool in_unnamed_package() const { return (_package_entry == NULL); } 454 void set_package(PackageEntry* p) { _package_entry = p; } 455 void set_package(ClassLoaderData* loader_data, TRAPS); 456 bool is_same_class_package(const Klass* class2) const; 457 bool is_same_class_package(oop classloader2, const Symbol* classname2) const; 458 static bool is_same_class_package(oop class_loader1, 459 const Symbol* class_name1, 460 oop class_loader2, 461 const Symbol* class_name2); 462 463 // find an enclosing class 464 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const; 465 466 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index. 467 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const; 468 469 private: 470 // Check prohibited package ("java/" only loadable by boot or platform loaders) 471 static void check_prohibited_package(Symbol* class_name, 472 Handle class_loader, 473 TRAPS); 474 public: 475 // tell if two classes have the same enclosing class (at package level) 476 bool is_same_package_member(const Klass* class2, TRAPS) const; 477 478 // initialization state 479 bool is_loaded() const { return _init_state >= loaded; } 480 bool is_linked() const { return _init_state >= linked; } 481 bool is_initialized() const { return _init_state == fully_initialized; } 482 bool is_not_initialized() const { return _init_state < being_initialized; } 483 bool is_being_initialized() const { return _init_state == being_initialized; } 484 bool is_in_error_state() const { return _init_state == initialization_error; } 485 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 486 ClassState init_state() { return (ClassState)_init_state; } 487 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 488 489 // defineClass specified verification 490 bool should_verify_class() const { 491 return (_misc_flags & _misc_should_verify_class) != 0; 492 } 493 void set_should_verify_class(bool value) { 494 if (value) { 495 _misc_flags |= _misc_should_verify_class; 496 } else { 497 _misc_flags &= ~_misc_should_verify_class; 498 } 499 } 500 501 // marking 502 bool is_marked_dependent() const { return _is_marked_dependent; } 503 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 504 505 // initialization (virtuals from Klass) 506 bool should_be_initialized() const; // means that initialize should be called 507 void initialize(TRAPS); 508 void link_class(TRAPS); 509 bool link_class_or_fail(TRAPS); // returns false on failure 510 void unlink_class(); 511 void rewrite_class(TRAPS); 512 void link_methods(TRAPS); 513 Method* class_initializer() const; 514 515 // set the class to initialized if no static initializer is present 516 void eager_initialize(Thread *thread); 517 518 // reference type 519 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 520 void set_reference_type(ReferenceType t) { 521 assert(t == (u1)t, "overflow"); 522 _reference_type = (u1)t; 523 } 524 525 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 526 527 // find local field, returns true if found 528 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 529 // find field in direct superinterfaces, returns the interface in which the field is defined 530 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 531 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 532 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 533 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 534 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 535 536 // find a non-static or static field given its offset within the class. 537 bool contains_field_offset(int offset) { 538 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); 539 } 540 541 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 542 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 543 544 // find a local method (returns NULL if not found) 545 Method* find_method(const Symbol* name, const Symbol* signature) const; 546 static Method* find_method(const Array<Method*>* methods, 547 const Symbol* name, 548 const Symbol* signature); 549 550 // find a local method, but skip static methods 551 Method* find_instance_method(const Symbol* name, const Symbol* signature) const; 552 static Method* find_instance_method(const Array<Method*>* methods, 553 const Symbol* name, 554 const Symbol* signature); 555 556 // find a local method (returns NULL if not found) 557 Method* find_local_method(const Symbol* name, 558 const Symbol* signature, 559 OverpassLookupMode overpass_mode, 560 StaticLookupMode static_mode, 561 PrivateLookupMode private_mode) const; 562 563 // find a local method from given methods array (returns NULL if not found) 564 static Method* find_local_method(const Array<Method*>* methods, 565 const Symbol* name, 566 const Symbol* signature, 567 OverpassLookupMode overpass_mode, 568 StaticLookupMode static_mode, 569 PrivateLookupMode private_mode); 570 571 // find a local method index in methods or default_methods (returns -1 if not found) 572 static int find_method_index(const Array<Method*>* methods, 573 const Symbol* name, 574 const Symbol* signature, 575 OverpassLookupMode overpass_mode, 576 StaticLookupMode static_mode, 577 PrivateLookupMode private_mode); 578 579 // lookup operation (returns NULL if not found) 580 Method* uncached_lookup_method(const Symbol* name, 581 const Symbol* signature, 582 OverpassLookupMode overpass_mode) const; 583 584 // lookup a method in all the interfaces that this class implements 585 // (returns NULL if not found) 586 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 587 588 // lookup a method in local defaults then in all interfaces 589 // (returns NULL if not found) 590 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 591 592 // Find method indices by name. If a method with the specified name is 593 // found the index to the first method is returned, and 'end' is filled in 594 // with the index of first non-name-matching method. If no method is found 595 // -1 is returned. 596 int find_method_by_name(const Symbol* name, int* end) const; 597 static int find_method_by_name(const Array<Method*>* methods, 598 const Symbol* name, int* end); 599 600 // constant pool 601 ConstantPool* constants() const { return _constants; } 602 void set_constants(ConstantPool* c) { _constants = c; } 603 604 // protection domain 605 oop protection_domain() const; 606 607 // signers 608 objArrayOop signers() const; 609 610 // host class 611 InstanceKlass* host_klass() const { 612 InstanceKlass** hk = adr_host_klass(); 613 if (hk == NULL) { 614 return NULL; 615 } else { 616 assert(*hk != NULL, "host klass should always be set if the address is not null"); 617 return *hk; 618 } 619 } 620 void set_host_klass(const InstanceKlass* host) { 621 assert(is_anonymous(), "not anonymous"); 622 const InstanceKlass** addr = (const InstanceKlass **)adr_host_klass(); 623 assert(addr != NULL, "no reversed space"); 624 if (addr != NULL) { 625 *addr = host; 626 } 627 } 628 bool is_anonymous() const { 629 return (_misc_flags & _misc_is_anonymous) != 0; 630 } 631 void set_is_anonymous(bool value) { 632 if (value) { 633 _misc_flags |= _misc_is_anonymous; 634 } else { 635 _misc_flags &= ~_misc_is_anonymous; 636 } 637 } 638 639 // Oop that keeps the metadata for this class from being unloaded 640 // in places where the metadata is stored in other places, like nmethods 641 oop klass_holder() const { 642 return is_anonymous() ? java_mirror() : class_loader(); 643 } 644 645 bool is_contended() const { 646 return (_misc_flags & _misc_is_contended) != 0; 647 } 648 void set_is_contended(bool value) { 649 if (value) { 650 _misc_flags |= _misc_is_contended; 651 } else { 652 _misc_flags &= ~_misc_is_contended; 653 } 654 } 655 656 // source file name 657 Symbol* source_file_name() const { 658 return (_source_file_name_index == 0) ? 659 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index); 660 } 661 u2 source_file_name_index() const { 662 return _source_file_name_index; 663 } 664 void set_source_file_name_index(u2 sourcefile_index) { 665 _source_file_name_index = sourcefile_index; 666 } 667 668 // minor and major version numbers of class file 669 u2 minor_version() const { return _minor_version; } 670 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 671 u2 major_version() const { return _major_version; } 672 void set_major_version(u2 major_version) { _major_version = major_version; } 673 674 // source debug extension 675 const char* source_debug_extension() const { return _source_debug_extension; } 676 void set_source_debug_extension(const char* array, int length); 677 678 // symbol unloading support (refcount already added) 679 Symbol* array_name() { return _array_name; } 680 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; } 681 682 // nonstatic oop-map blocks 683 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 684 return oop_map_count * OopMapBlock::size_in_words(); 685 } 686 unsigned int nonstatic_oop_map_count() const { 687 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 688 } 689 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 690 void set_nonstatic_oop_map_size(int words) { 691 _nonstatic_oop_map_size = words; 692 } 693 694 #if INCLUDE_JVMTI 695 // Redefinition locking. Class can only be redefined by one thread at a time. 696 bool is_being_redefined() const { return _is_being_redefined; } 697 void set_is_being_redefined(bool value) { _is_being_redefined = value; } 698 699 // RedefineClasses() support for previous versions: 700 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 701 void purge_previous_version_list(); 702 703 InstanceKlass* previous_versions() const { return _previous_versions; } 704 #else 705 InstanceKlass* previous_versions() const { return NULL; } 706 #endif 707 708 InstanceKlass* get_klass_version(int version) { 709 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 710 if (ik->constants()->version() == version) { 711 return ik; 712 } 713 } 714 return NULL; 715 } 716 717 bool has_been_redefined() const { 718 return (_misc_flags & _misc_has_been_redefined) != 0; 719 } 720 void set_has_been_redefined() { 721 _misc_flags |= _misc_has_been_redefined; 722 } 723 724 bool has_passed_fingerprint_check() const { 725 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0; 726 } 727 void set_has_passed_fingerprint_check(bool b) { 728 if (b) { 729 _misc_flags |= _misc_has_passed_fingerprint_check; 730 } else { 731 _misc_flags &= ~_misc_has_passed_fingerprint_check; 732 } 733 } 734 bool supers_have_passed_fingerprint_checks(); 735 736 static bool should_store_fingerprint(); 737 bool has_stored_fingerprint() const; 738 uint64_t get_stored_fingerprint() const; 739 void store_fingerprint(uint64_t fingerprint); 740 741 bool is_scratch_class() const { 742 return (_misc_flags & _misc_is_scratch_class) != 0; 743 } 744 745 void set_is_scratch_class() { 746 _misc_flags |= _misc_is_scratch_class; 747 } 748 749 bool has_resolved_methods() const { 750 return (_misc_flags & _misc_has_resolved_methods) != 0; 751 } 752 753 void set_has_resolved_methods() { 754 _misc_flags |= _misc_has_resolved_methods; 755 } 756 private: 757 758 void set_kind(unsigned kind) { 759 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind"); 760 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos; 761 unsigned flags = _misc_flags & ~fmask; 762 _misc_flags = (flags | (kind << _misc_kind_field_pos)); 763 } 764 765 bool is_kind(unsigned desired) const { 766 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask; 767 return kind == desired; 768 } 769 770 public: 771 772 // Other is anything that is not one of the more specialized kinds of InstanceKlass. 773 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); } 774 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); } 775 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); } 776 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); } 777 778 #if INCLUDE_JVMTI 779 780 void init_previous_versions() { 781 _previous_versions = NULL; 782 } 783 784 private: 785 static bool _has_previous_versions; 786 public: 787 static void purge_previous_versions(InstanceKlass* ik) { 788 if (ik->has_been_redefined()) { 789 ik->purge_previous_version_list(); 790 } 791 } 792 793 static bool has_previous_versions_and_reset(); 794 795 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 796 void set_cached_class_file(JvmtiCachedClassFileData *data) { 797 _cached_class_file = data; 798 } 799 JvmtiCachedClassFileData * get_cached_class_file(); 800 jint get_cached_class_file_len(); 801 unsigned char * get_cached_class_file_bytes(); 802 803 // JVMTI: Support for caching of field indices, types, and offsets 804 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 805 _jvmti_cached_class_field_map = descriptor; 806 } 807 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 808 return _jvmti_cached_class_field_map; 809 } 810 811 #if INCLUDE_CDS 812 void set_archived_class_data(JvmtiCachedClassFileData* data) { 813 _cached_class_file = data; 814 } 815 816 JvmtiCachedClassFileData * get_archived_class_data(); 817 #endif // INCLUDE_CDS 818 #else // INCLUDE_JVMTI 819 820 static void purge_previous_versions(InstanceKlass* ik) { return; }; 821 static bool has_previous_versions_and_reset() { return false; } 822 823 void set_cached_class_file(JvmtiCachedClassFileData *data) { 824 assert(data == NULL, "unexpected call with JVMTI disabled"); 825 } 826 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; } 827 828 #endif // INCLUDE_JVMTI 829 830 bool has_nonstatic_concrete_methods() const { 831 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0; 832 } 833 void set_has_nonstatic_concrete_methods(bool b) { 834 if (b) { 835 _misc_flags |= _misc_has_nonstatic_concrete_methods; 836 } else { 837 _misc_flags &= ~_misc_has_nonstatic_concrete_methods; 838 } 839 } 840 841 bool declares_nonstatic_concrete_methods() const { 842 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0; 843 } 844 void set_declares_nonstatic_concrete_methods(bool b) { 845 if (b) { 846 _misc_flags |= _misc_declares_nonstatic_concrete_methods; 847 } else { 848 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods; 849 } 850 } 851 852 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 853 inline u2 next_method_idnum(); 854 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 855 856 // generics support 857 Symbol* generic_signature() const { 858 return (_generic_signature_index == 0) ? 859 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index); 860 } 861 u2 generic_signature_index() const { 862 return _generic_signature_index; 863 } 864 void set_generic_signature_index(u2 sig_index) { 865 _generic_signature_index = sig_index; 866 } 867 868 u2 enclosing_method_data(int offset) const; 869 u2 enclosing_method_class_index() const { 870 return enclosing_method_data(enclosing_method_class_index_offset); 871 } 872 u2 enclosing_method_method_index() { 873 return enclosing_method_data(enclosing_method_method_index_offset); 874 } 875 void set_enclosing_method_indices(u2 class_index, 876 u2 method_index); 877 878 // jmethodID support 879 jmethodID get_jmethod_id(const methodHandle& method_h); 880 jmethodID get_jmethod_id_fetch_or_update(size_t idnum, 881 jmethodID new_id, jmethodID* new_jmeths, 882 jmethodID* to_dealloc_id_p, 883 jmethodID** to_dealloc_jmeths_p); 884 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 885 size_t *length_p, jmethodID* id_p); 886 void ensure_space_for_methodids(int start_offset = 0); 887 jmethodID jmethod_id_or_null(Method* method); 888 889 // annotations support 890 Annotations* annotations() const { return _annotations; } 891 void set_annotations(Annotations* anno) { _annotations = anno; } 892 893 AnnotationArray* class_annotations() const { 894 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 895 } 896 Array<AnnotationArray*>* fields_annotations() const { 897 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 898 } 899 AnnotationArray* class_type_annotations() const { 900 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 901 } 902 Array<AnnotationArray*>* fields_type_annotations() const { 903 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 904 } 905 // allocation 906 instanceOop allocate_instance(TRAPS); 907 908 // additional member function to return a handle 909 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } 910 911 objArrayOop allocate_objArray(int n, int length, TRAPS); 912 // Helper function 913 static instanceOop register_finalizer(instanceOop i, TRAPS); 914 915 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 916 // if not, throw either an Error or an Exception. 917 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 918 919 // initialization 920 void call_class_initializer(TRAPS); 921 void set_initialization_state_and_notify(ClassState state, TRAPS); 922 923 // OopMapCache support 924 OopMapCache* oop_map_cache() { return _oop_map_cache; } 925 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 926 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 927 928 // JNI identifier support (for static fields - for jni performance) 929 JNIid* jni_ids() { return _jni_ids; } 930 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 931 JNIid* jni_id_for(int offset); 932 933 // maintenance of deoptimization dependencies 934 inline DependencyContext dependencies(); 935 int mark_dependent_nmethods(KlassDepChange& changes); 936 void add_dependent_nmethod(nmethod* nm); 937 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately); 938 939 // On-stack replacement support 940 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 941 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 942 void add_osr_nmethod(nmethod* n); 943 bool remove_osr_nmethod(nmethod* n); 944 int mark_osr_nmethods(const Method* m); 945 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 946 947 #if INCLUDE_JVMTI 948 // Breakpoint support (see methods on Method* for details) 949 BreakpointInfo* breakpoints() const { return _breakpoints; }; 950 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 951 #endif 952 953 // support for stub routines 954 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 955 TRACE_DEFINE_KLASS_TRACE_ID_OFFSET; 956 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 957 958 // subclass/subinterface checks 959 bool implements_interface(Klass* k) const; 960 bool is_same_or_direct_interface(Klass* k) const; 961 962 #ifdef ASSERT 963 // check whether this class or one of its superclasses was redefined 964 bool has_redefined_this_or_super() const; 965 #endif 966 967 // Access to the implementor of an interface. 968 Klass* implementor() const 969 { 970 Klass** k = adr_implementor(); 971 if (k == NULL) { 972 return NULL; 973 } else { 974 return *k; 975 } 976 } 977 978 void set_implementor(Klass* k) { 979 assert(is_interface(), "not interface"); 980 Klass** addr = adr_implementor(); 981 assert(addr != NULL, "null addr"); 982 if (addr != NULL) { 983 *addr = k; 984 } 985 } 986 987 int nof_implementors() const { 988 Klass* k = implementor(); 989 if (k == NULL) { 990 return 0; 991 } else if (k != this) { 992 return 1; 993 } else { 994 return 2; 995 } 996 } 997 998 void add_implementor(Klass* k); // k is a new class that implements this interface 999 void init_implementor(); // initialize 1000 1001 // link this class into the implementors list of every interface it implements 1002 void process_interfaces(Thread *thread); 1003 1004 // virtual operations from Klass 1005 bool is_leaf_class() const { return _subklass == NULL; } 1006 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); 1007 bool compute_is_subtype_of(Klass* k); 1008 bool can_be_primary_super_slow() const; 1009 int oop_size(oop obj) const { return size_helper(); } 1010 // slow because it's a virtual call and used for verifying the layout_helper. 1011 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 1012 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 1013 1014 // Iterators 1015 void do_local_static_fields(FieldClosure* cl); 1016 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 1017 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 1018 1019 void methods_do(void f(Method* method)); 1020 void array_klasses_do(void f(Klass* k)); 1021 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 1022 bool super_types_do(SuperTypeClosure* blk); 1023 1024 static InstanceKlass* cast(Klass* k) { 1025 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 1026 } 1027 1028 static const InstanceKlass* cast(const Klass* k) { 1029 assert(k != NULL, "k should not be null"); 1030 assert(k->is_instance_klass(), "cast to InstanceKlass"); 1031 return static_cast<const InstanceKlass*>(k); 1032 } 1033 1034 InstanceKlass* java_super() const { 1035 return (super() == NULL) ? NULL : cast(super()); 1036 } 1037 1038 // Sizing (in words) 1039 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 1040 1041 static int size(int vtable_length, int itable_length, 1042 int nonstatic_oop_map_size, 1043 bool is_interface, bool is_anonymous, bool has_stored_fingerprint) { 1044 return align_metadata_size(header_size() + 1045 vtable_length + 1046 itable_length + 1047 nonstatic_oop_map_size + 1048 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) + 1049 (is_anonymous ? (int)sizeof(Klass*)/wordSize : 0) + 1050 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0)); 1051 } 1052 int size() const { return size(vtable_length(), 1053 itable_length(), 1054 nonstatic_oop_map_size(), 1055 is_interface(), 1056 is_anonymous(), 1057 has_stored_fingerprint()); 1058 } 1059 #if INCLUDE_SERVICES 1060 virtual void collect_statistics(KlassSizeStats *sz) const; 1061 #endif 1062 1063 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); } 1064 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 1065 1066 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 1067 1068 address static_field_addr(int offset); 1069 1070 OopMapBlock* start_of_nonstatic_oop_maps() const { 1071 return (OopMapBlock*)(start_of_itable() + itable_length()); 1072 } 1073 1074 Klass** end_of_nonstatic_oop_maps() const { 1075 return (Klass**)(start_of_nonstatic_oop_maps() + 1076 nonstatic_oop_map_count()); 1077 } 1078 1079 Klass** adr_implementor() const { 1080 if (is_interface()) { 1081 return (Klass**)end_of_nonstatic_oop_maps(); 1082 } else { 1083 return NULL; 1084 } 1085 }; 1086 1087 InstanceKlass** adr_host_klass() const { 1088 if (is_anonymous()) { 1089 InstanceKlass** adr_impl = (InstanceKlass **)adr_implementor(); 1090 if (adr_impl != NULL) { 1091 return adr_impl + 1; 1092 } else { 1093 return (InstanceKlass **)end_of_nonstatic_oop_maps(); 1094 } 1095 } else { 1096 return NULL; 1097 } 1098 } 1099 1100 address adr_fingerprint() const { 1101 if (has_stored_fingerprint()) { 1102 InstanceKlass** adr_host = adr_host_klass(); 1103 if (adr_host != NULL) { 1104 return (address)(adr_host + 1); 1105 } 1106 1107 Klass** adr_impl = adr_implementor(); 1108 if (adr_impl != NULL) { 1109 return (address)(adr_impl + 1); 1110 } 1111 1112 return (address)end_of_nonstatic_oop_maps(); 1113 } else { 1114 return NULL; 1115 } 1116 } 1117 1118 // Use this to return the size of an instance in heap words: 1119 int size_helper() const { 1120 return layout_helper_to_size_helper(layout_helper()); 1121 } 1122 1123 // This bit is initialized in classFileParser.cpp. 1124 // It is false under any of the following conditions: 1125 // - the class is abstract (including any interface) 1126 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1127 // - the class size is larger than FastAllocateSizeLimit 1128 // - the class is java/lang/Class, which cannot be allocated directly 1129 bool can_be_fastpath_allocated() const { 1130 return !layout_helper_needs_slow_path(layout_helper()); 1131 } 1132 1133 // Java itable 1134 klassItable itable() const; // return klassItable wrapper 1135 Method* method_at_itable(Klass* holder, int index, TRAPS); 1136 1137 #if INCLUDE_JVMTI 1138 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed); 1139 #endif // INCLUDE_JVMTI 1140 1141 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive); 1142 void clean_implementors_list(BoolObjectClosure* is_alive); 1143 void clean_method_data(BoolObjectClosure* is_alive); 1144 1145 // Explicit metaspace deallocation of fields 1146 // For RedefineClasses and class file parsing errors, we need to deallocate 1147 // instanceKlasses and the metadata they point to. 1148 void deallocate_contents(ClassLoaderData* loader_data); 1149 static void deallocate_methods(ClassLoaderData* loader_data, 1150 Array<Method*>* methods); 1151 void static deallocate_interfaces(ClassLoaderData* loader_data, 1152 const Klass* super_klass, 1153 Array<Klass*>* local_interfaces, 1154 Array<Klass*>* transitive_interfaces); 1155 1156 // The constant pool is on stack if any of the methods are executing or 1157 // referenced by handles. 1158 bool on_stack() const { return _constants->on_stack(); } 1159 1160 // callbacks for actions during class unloading 1161 static void notify_unload_class(InstanceKlass* ik); 1162 static void release_C_heap_structures(InstanceKlass* ik); 1163 1164 // Naming 1165 const char* signature_name() const; 1166 static Symbol* package_from_name(const Symbol* name, TRAPS); 1167 1168 // GC specific object visitors 1169 // 1170 #if INCLUDE_ALL_GCS 1171 // Parallel Scavenge 1172 void oop_ps_push_contents( oop obj, PSPromotionManager* pm); 1173 // Parallel Compact 1174 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm); 1175 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm); 1176 #endif 1177 1178 // Oop fields (and metadata) iterators 1179 // [nv = true] Use non-virtual calls to do_oop_nv. 1180 // [nv = false] Use virtual calls to do_oop. 1181 // 1182 // The InstanceKlass iterators also visits the Object's klass. 1183 1184 // Forward iteration 1185 public: 1186 // Iterate over all oop fields in the oop maps. 1187 template <bool nv, class OopClosureType> 1188 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1189 1190 protected: 1191 // Iterate over all oop fields and metadata. 1192 template <bool nv, class OopClosureType> 1193 inline int oop_oop_iterate(oop obj, OopClosureType* closure); 1194 1195 private: 1196 // Iterate over all oop fields in the oop maps. 1197 // Specialized for [T = oop] or [T = narrowOop]. 1198 template <bool nv, typename T, class OopClosureType> 1199 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure); 1200 1201 // Iterate over all oop fields in one oop map. 1202 template <bool nv, typename T, class OopClosureType> 1203 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1204 1205 1206 // Reverse iteration 1207 #if INCLUDE_ALL_GCS 1208 public: 1209 // Iterate over all oop fields in the oop maps. 1210 template <bool nv, class OopClosureType> 1211 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1212 1213 protected: 1214 // Iterate over all oop fields and metadata. 1215 template <bool nv, class OopClosureType> 1216 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1217 1218 private: 1219 // Iterate over all oop fields in the oop maps. 1220 // Specialized for [T = oop] or [T = narrowOop]. 1221 template <bool nv, typename T, class OopClosureType> 1222 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure); 1223 1224 // Iterate over all oop fields in one oop map. 1225 template <bool nv, typename T, class OopClosureType> 1226 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1227 #endif 1228 1229 1230 // Bounded range iteration 1231 public: 1232 // Iterate over all oop fields in the oop maps. 1233 template <bool nv, class OopClosureType> 1234 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1235 1236 protected: 1237 // Iterate over all oop fields and metadata. 1238 template <bool nv, class OopClosureType> 1239 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1240 1241 private: 1242 // Iterate over all oop fields in the oop maps. 1243 // Specialized for [T = oop] or [T = narrowOop]. 1244 template <bool nv, typename T, class OopClosureType> 1245 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1246 1247 // Iterate over all oop fields in one oop map. 1248 template <bool nv, typename T, class OopClosureType> 1249 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1250 1251 1252 public: 1253 1254 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL) 1255 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL) 1256 1257 #if INCLUDE_ALL_GCS 1258 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS) 1259 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS) 1260 #endif // INCLUDE_ALL_GCS 1261 1262 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1263 1264 public: 1265 void set_in_error_state() { 1266 assert(DumpSharedSpaces, "only call this when dumping archive"); 1267 _init_state = initialization_error; 1268 } 1269 bool check_sharing_error_state(); 1270 1271 private: 1272 // initialization state 1273 #ifdef ASSERT 1274 void set_init_state(ClassState state); 1275 #else 1276 void set_init_state(ClassState state) { _init_state = (u1)state; } 1277 #endif 1278 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1279 void set_init_thread(Thread *thread) { _init_thread = thread; } 1280 1281 // The RedefineClasses() API can cause new method idnums to be needed 1282 // which will cause the caches to grow. Safety requires different 1283 // cache management logic if the caches can grow instead of just 1284 // going from NULL to non-NULL. 1285 bool idnum_can_increment() const { return has_been_redefined(); } 1286 inline jmethodID* methods_jmethod_ids_acquire() const; 1287 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1288 1289 // Lock during initialization 1290 public: 1291 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1292 // Must be one per class and it has to be a VM internal object so java code 1293 // cannot lock it (like the mirror). 1294 // It has to be an object not a Mutex because it's held through java calls. 1295 oop init_lock() const; 1296 private: 1297 void fence_and_clear_init_lock(); 1298 1299 bool link_class_impl (bool throw_verifyerror, TRAPS); 1300 bool verify_code (bool throw_verifyerror, TRAPS); 1301 void initialize_impl (TRAPS); 1302 void initialize_super_interfaces (TRAPS); 1303 void eager_initialize_impl (); 1304 /* jni_id_for_impl for jfieldID only */ 1305 JNIid* jni_id_for_impl (int offset); 1306 1307 // Returns the array class for the n'th dimension 1308 Klass* array_klass_impl(bool or_null, int n, TRAPS); 1309 1310 // Returns the array class with this class as element type 1311 Klass* array_klass_impl(bool or_null, TRAPS); 1312 1313 // find a local method (returns NULL if not found) 1314 Method* find_method_impl(const Symbol* name, 1315 const Symbol* signature, 1316 OverpassLookupMode overpass_mode, 1317 StaticLookupMode static_mode, 1318 PrivateLookupMode private_mode) const; 1319 1320 static Method* find_method_impl(const Array<Method*>* methods, 1321 const Symbol* name, 1322 const Symbol* signature, 1323 OverpassLookupMode overpass_mode, 1324 StaticLookupMode static_mode, 1325 PrivateLookupMode private_mode); 1326 1327 // Free CHeap allocated fields. 1328 void release_C_heap_structures(); 1329 1330 #if INCLUDE_JVMTI 1331 // RedefineClasses support 1332 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1333 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1334 #endif 1335 public: 1336 // CDS support - remove and restore oops from metadata. Oops are not shared. 1337 virtual void remove_unshareable_info(); 1338 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 1339 1340 // jvm support 1341 jint compute_modifier_flags(TRAPS) const; 1342 1343 public: 1344 // JVMTI support 1345 jint jvmti_class_status() const; 1346 1347 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 1348 1349 public: 1350 // Printing 1351 #ifndef PRODUCT 1352 void print_on(outputStream* st) const; 1353 #endif 1354 void print_value_on(outputStream* st) const; 1355 1356 void oop_print_value_on(oop obj, outputStream* st); 1357 1358 #ifndef PRODUCT 1359 void oop_print_on (oop obj, outputStream* st); 1360 1361 void print_dependent_nmethods(bool verbose = false); 1362 bool is_dependent_nmethod(nmethod* nm); 1363 #endif 1364 1365 const char* internal_name() const; 1366 1367 // Verification 1368 void verify_on(outputStream* st); 1369 1370 void oop_verify_on(oop obj, outputStream* st); 1371 1372 // Logging 1373 void print_class_load_logging(ClassLoaderData* loader_data, 1374 const char* module_name, 1375 const ClassFileStream* cfs) const; 1376 }; 1377 1378 // for adding methods 1379 // UNSET_IDNUM return means no more ids available 1380 inline u2 InstanceKlass::next_method_idnum() { 1381 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1382 return ConstMethod::UNSET_IDNUM; // no more ids available 1383 } else { 1384 return _idnum_allocated_count++; 1385 } 1386 } 1387 1388 1389 /* JNIid class for jfieldIDs only */ 1390 class JNIid: public CHeapObj<mtClass> { 1391 friend class VMStructs; 1392 private: 1393 Klass* _holder; 1394 JNIid* _next; 1395 int _offset; 1396 #ifdef ASSERT 1397 bool _is_static_field_id; 1398 #endif 1399 1400 public: 1401 // Accessors 1402 Klass* holder() const { return _holder; } 1403 int offset() const { return _offset; } 1404 JNIid* next() { return _next; } 1405 // Constructor 1406 JNIid(Klass* holder, int offset, JNIid* next); 1407 // Identifier lookup 1408 JNIid* find(int offset); 1409 1410 bool find_local_field(fieldDescriptor* fd) { 1411 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1412 } 1413 1414 static void deallocate(JNIid* id); 1415 // Debugging 1416 #ifdef ASSERT 1417 bool is_static_field_id() const { return _is_static_field_id; } 1418 void set_is_static_field_id() { _is_static_field_id = true; } 1419 #endif 1420 void verify(Klass* holder); 1421 }; 1422 1423 // An iterator that's used to access the inner classes indices in the 1424 // InstanceKlass::_inner_classes array. 1425 class InnerClassesIterator : public StackObj { 1426 private: 1427 Array<jushort>* _inner_classes; 1428 int _length; 1429 int _idx; 1430 public: 1431 1432 InnerClassesIterator(const InstanceKlass* k) { 1433 _inner_classes = k->inner_classes(); 1434 if (k->inner_classes() != NULL) { 1435 _length = _inner_classes->length(); 1436 // The inner class array's length should be the multiple of 1437 // inner_class_next_offset if it only contains the InnerClasses 1438 // attribute data, or it should be 1439 // n*inner_class_next_offset+enclosing_method_attribute_size 1440 // if it also contains the EnclosingMethod data. 1441 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1442 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1443 "just checking"); 1444 // Remove the enclosing_method portion if exists. 1445 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1446 _length -= InstanceKlass::enclosing_method_attribute_size; 1447 } 1448 } else { 1449 _length = 0; 1450 } 1451 _idx = 0; 1452 } 1453 1454 int length() const { 1455 return _length; 1456 } 1457 1458 void next() { 1459 _idx += InstanceKlass::inner_class_next_offset; 1460 } 1461 1462 bool done() const { 1463 return (_idx >= _length); 1464 } 1465 1466 u2 inner_class_info_index() const { 1467 return _inner_classes->at( 1468 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1469 } 1470 1471 void set_inner_class_info_index(u2 index) { 1472 _inner_classes->at_put( 1473 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1474 } 1475 1476 u2 outer_class_info_index() const { 1477 return _inner_classes->at( 1478 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1479 } 1480 1481 void set_outer_class_info_index(u2 index) { 1482 _inner_classes->at_put( 1483 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1484 } 1485 1486 u2 inner_name_index() const { 1487 return _inner_classes->at( 1488 _idx + InstanceKlass::inner_class_inner_name_offset); 1489 } 1490 1491 void set_inner_name_index(u2 index) { 1492 _inner_classes->at_put( 1493 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1494 } 1495 1496 u2 inner_access_flags() const { 1497 return _inner_classes->at( 1498 _idx + InstanceKlass::inner_class_access_flags_offset); 1499 } 1500 }; 1501 1502 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP