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 "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/align.hpp" 44 #include "utilities/macros.hpp" 45 46 // An InstanceKlass is the VM level representation of a Java class. 47 // It contains all information needed for at class at execution runtime. 48 49 // InstanceKlass embedded field layout (after declared fields): 50 // [EMBEDDED Java vtable ] size in words = vtable_len 51 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size 52 // The embedded nonstatic oop-map blocks are short pairs (offset, length) 53 // indicating where oops are located in instances of this klass. 54 // [EMBEDDED implementor of the interface] only exist for interface 55 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled) 56 // [EMBEDDED fingerprint ] only if should_store_fingerprint()==true 57 58 59 // forward declaration for class -- see below for definition 60 #if INCLUDE_JVMTI 61 class BreakpointInfo; 62 #endif 63 class ClassFileParser; 64 class KlassDepChange; 65 class DependencyContext; 66 class fieldDescriptor; 67 class jniIdMapBase; 68 class JNIid; 69 class JvmtiCachedClassFieldMap; 70 class SuperTypeClosure; 71 72 // This is used in iterators below. 73 class FieldClosure: public StackObj { 74 public: 75 virtual void do_field(fieldDescriptor* fd) = 0; 76 }; 77 78 #ifndef PRODUCT 79 // Print fields. 80 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. 81 class FieldPrinter: public FieldClosure { 82 oop _obj; 83 outputStream* _st; 84 public: 85 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} 86 void do_field(fieldDescriptor* fd); 87 }; 88 #endif // !PRODUCT 89 90 // Describes where oops are located in instances of this klass. 91 class OopMapBlock { 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_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 private: 138 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS); 139 140 protected: 141 // If you add a new field that points to any metaspace object, you 142 // must add this field to InstanceKlass::metaspace_pointers_do(). 143 144 // 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 switch (loader_type) { 327 case ClassLoader::BOOT_LOADER: 328 _misc_flags |= _misc_is_shared_boot_class; 329 break; 330 case ClassLoader::PLATFORM_LOADER: 331 _misc_flags |= _misc_is_shared_platform_class; 332 break; 333 case ClassLoader::APP_LOADER: 334 _misc_flags |= _misc_is_shared_app_class; 335 break; 336 default: 337 ShouldNotReachHere(); 338 break; 339 } 340 } 341 342 bool has_nonstatic_fields() const { 343 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 344 } 345 void set_has_nonstatic_fields(bool b) { 346 if (b) { 347 _misc_flags |= _misc_has_nonstatic_fields; 348 } else { 349 _misc_flags &= ~_misc_has_nonstatic_fields; 350 } 351 } 352 353 // field sizes 354 int nonstatic_field_size() const { return _nonstatic_field_size; } 355 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 356 357 int static_field_size() const { return _static_field_size; } 358 void set_static_field_size(int size) { _static_field_size = size; } 359 360 int static_oop_field_count() const { return (int)_static_oop_field_count; } 361 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 362 363 // Java itable 364 int itable_length() const { return _itable_len; } 365 void set_itable_length(int len) { _itable_len = len; } 366 367 // array klasses 368 Klass* array_klasses() const { return _array_klasses; } 369 inline Klass* array_klasses_acquire() const; // load with acquire semantics 370 void set_array_klasses(Klass* k) { _array_klasses = k; } 371 inline void release_set_array_klasses(Klass* k); // store with release semantics 372 373 // methods 374 Array<Method*>* methods() const { return _methods; } 375 void set_methods(Array<Method*>* a) { _methods = a; } 376 Method* method_with_idnum(int idnum); 377 Method* method_with_orig_idnum(int idnum); 378 Method* method_with_orig_idnum(int idnum, int version); 379 380 // method ordering 381 Array<int>* method_ordering() const { return _method_ordering; } 382 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 383 void copy_method_ordering(const intArray* m, TRAPS); 384 385 // default_methods 386 Array<Method*>* default_methods() const { return _default_methods; } 387 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 388 389 // default method vtable_indices 390 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 391 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 392 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 393 394 // interfaces 395 Array<Klass*>* local_interfaces() const { return _local_interfaces; } 396 void set_local_interfaces(Array<Klass*>* a) { 397 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 398 _local_interfaces = a; } 399 400 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; } 401 void set_transitive_interfaces(Array<Klass*>* a) { 402 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 403 _transitive_interfaces = a; 404 } 405 406 private: 407 friend class fieldDescriptor; 408 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 409 410 public: 411 int field_offset (int index) const { return field(index)->offset(); } 412 int field_access_flags(int index) const { return field(index)->access_flags(); } 413 Symbol* field_name (int index) const { return field(index)->name(constants()); } 414 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 415 416 // Number of Java declared fields 417 int java_fields_count() const { return (int)_java_fields_count; } 418 419 Array<u2>* fields() const { return _fields; } 420 void set_fields(Array<u2>* f, u2 java_fields_count) { 421 guarantee(_fields == NULL || f == NULL, "Just checking"); 422 _fields = f; 423 _java_fields_count = java_fields_count; 424 } 425 426 // inner classes 427 Array<u2>* inner_classes() const { return _inner_classes; } 428 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 429 430 enum InnerClassAttributeOffset { 431 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 432 inner_class_inner_class_info_offset = 0, 433 inner_class_outer_class_info_offset = 1, 434 inner_class_inner_name_offset = 2, 435 inner_class_access_flags_offset = 3, 436 inner_class_next_offset = 4 437 }; 438 439 enum EnclosingMethodAttributeOffset { 440 enclosing_method_class_index_offset = 0, 441 enclosing_method_method_index_offset = 1, 442 enclosing_method_attribute_size = 2 443 }; 444 445 // method override check 446 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 447 448 // package 449 PackageEntry* package() const { return _package_entry; } 450 ModuleEntry* module() const; 451 bool in_unnamed_package() const { return (_package_entry == NULL); } 452 void set_package(PackageEntry* p) { _package_entry = p; } 453 void set_package(ClassLoaderData* loader_data, TRAPS); 454 bool is_same_class_package(const Klass* class2) const; 455 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const; 456 457 // find an enclosing class 458 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const; 459 460 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index. 461 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const; 462 463 private: 464 // Check prohibited package ("java/" only loadable by boot or platform loaders) 465 static void check_prohibited_package(Symbol* class_name, 466 Handle class_loader, 467 TRAPS); 468 public: 469 // tell if two classes have the same enclosing class (at package level) 470 bool is_same_package_member(const Klass* class2, TRAPS) const; 471 472 // initialization state 473 bool is_loaded() const { return _init_state >= loaded; } 474 bool is_linked() const { return _init_state >= linked; } 475 bool is_initialized() const { return _init_state == fully_initialized; } 476 bool is_not_initialized() const { return _init_state < being_initialized; } 477 bool is_being_initialized() const { return _init_state == being_initialized; } 478 bool is_in_error_state() const { return _init_state == initialization_error; } 479 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 480 ClassState init_state() { return (ClassState)_init_state; } 481 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 482 483 // defineClass specified verification 484 bool should_verify_class() const { 485 return (_misc_flags & _misc_should_verify_class) != 0; 486 } 487 void set_should_verify_class(bool value) { 488 if (value) { 489 _misc_flags |= _misc_should_verify_class; 490 } else { 491 _misc_flags &= ~_misc_should_verify_class; 492 } 493 } 494 495 // marking 496 bool is_marked_dependent() const { return _is_marked_dependent; } 497 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 498 499 // initialization (virtuals from Klass) 500 bool should_be_initialized() const; // means that initialize should be called 501 void initialize(TRAPS); 502 void link_class(TRAPS); 503 bool link_class_or_fail(TRAPS); // returns false on failure 504 void unlink_class(); 505 void rewrite_class(TRAPS); 506 void link_methods(TRAPS); 507 Method* class_initializer() const; 508 509 // set the class to initialized if no static initializer is present 510 void eager_initialize(Thread *thread); 511 512 // reference type 513 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 514 void set_reference_type(ReferenceType t) { 515 assert(t == (u1)t, "overflow"); 516 _reference_type = (u1)t; 517 } 518 519 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 520 521 // find local field, returns true if found 522 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 523 // find field in direct superinterfaces, returns the interface in which the field is defined 524 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 525 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 526 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 527 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 528 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 529 530 // find a non-static or static field given its offset within the class. 531 bool contains_field_offset(int offset) { 532 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); 533 } 534 535 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 536 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 537 538 // find a local method (returns NULL if not found) 539 Method* find_method(const Symbol* name, const Symbol* signature) const; 540 static Method* find_method(const Array<Method*>* methods, 541 const Symbol* name, 542 const Symbol* signature); 543 544 // find a local method, but skip static methods 545 Method* find_instance_method(const Symbol* name, const Symbol* signature) const; 546 static Method* find_instance_method(const Array<Method*>* methods, 547 const Symbol* name, 548 const Symbol* signature); 549 550 // find a local method (returns NULL if not found) 551 Method* find_local_method(const Symbol* name, 552 const Symbol* signature, 553 OverpassLookupMode overpass_mode, 554 StaticLookupMode static_mode, 555 PrivateLookupMode private_mode) const; 556 557 // find a local method from given methods array (returns NULL if not found) 558 static Method* find_local_method(const Array<Method*>* methods, 559 const Symbol* name, 560 const Symbol* signature, 561 OverpassLookupMode overpass_mode, 562 StaticLookupMode static_mode, 563 PrivateLookupMode private_mode); 564 565 // find a local method index in methods or default_methods (returns -1 if not found) 566 static int find_method_index(const Array<Method*>* methods, 567 const Symbol* name, 568 const Symbol* signature, 569 OverpassLookupMode overpass_mode, 570 StaticLookupMode static_mode, 571 PrivateLookupMode private_mode); 572 573 // lookup operation (returns NULL if not found) 574 Method* uncached_lookup_method(const Symbol* name, 575 const Symbol* signature, 576 OverpassLookupMode overpass_mode) const; 577 578 // lookup a method in all the interfaces that this class implements 579 // (returns NULL if not found) 580 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 581 582 // lookup a method in local defaults then in all interfaces 583 // (returns NULL if not found) 584 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 585 586 // Find method indices by name. If a method with the specified name is 587 // found the index to the first method is returned, and 'end' is filled in 588 // with the index of first non-name-matching method. If no method is found 589 // -1 is returned. 590 int find_method_by_name(const Symbol* name, int* end) const; 591 static int find_method_by_name(const Array<Method*>* methods, 592 const Symbol* name, int* end); 593 594 // constant pool 595 ConstantPool* constants() const { return _constants; } 596 void set_constants(ConstantPool* c) { _constants = c; } 597 598 // protection domain 599 oop protection_domain() const; 600 601 // signers 602 objArrayOop signers() const; 603 604 // host class 605 InstanceKlass* host_klass() const { 606 InstanceKlass** hk = adr_host_klass(); 607 if (hk == NULL) { 608 assert(!is_anonymous(), "Anonymous classes have host klasses"); 609 return NULL; 610 } else { 611 assert(*hk != NULL, "host klass should always be set if the address is not null"); 612 assert(is_anonymous(), "Only anonymous classes have host klasses"); 613 return *hk; 614 } 615 } 616 void set_host_klass(const InstanceKlass* host) { 617 assert(is_anonymous(), "not anonymous"); 618 const InstanceKlass** addr = (const InstanceKlass **)adr_host_klass(); 619 assert(addr != NULL, "no reversed space"); 620 if (addr != NULL) { 621 *addr = host; 622 } 623 } 624 bool has_host_klass() const { 625 return adr_host_klass() != NULL; 626 } 627 bool is_anonymous() const { 628 return (_misc_flags & _misc_is_anonymous) != 0; 629 } 630 void set_is_anonymous(bool value) { 631 if (value) { 632 _misc_flags |= _misc_is_anonymous; 633 } else { 634 _misc_flags &= ~_misc_is_anonymous; 635 } 636 } 637 638 // Oop that keeps the metadata for this class from being unloaded 639 // in places where the metadata is stored in other places, like nmethods 640 oop klass_holder() const { 641 return is_anonymous() ? java_mirror() : class_loader(); 642 } 643 644 // Load the klass_holder as a phantom. This is useful when a weak Klass 645 // pointer has been "peeked" and then must be kept alive before it may 646 // be used safely. 647 oop klass_holder_phantom(); 648 649 bool is_contended() const { 650 return (_misc_flags & _misc_is_contended) != 0; 651 } 652 void set_is_contended(bool value) { 653 if (value) { 654 _misc_flags |= _misc_is_contended; 655 } else { 656 _misc_flags &= ~_misc_is_contended; 657 } 658 } 659 660 // source file name 661 Symbol* source_file_name() const { 662 return (_source_file_name_index == 0) ? 663 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index); 664 } 665 u2 source_file_name_index() const { 666 return _source_file_name_index; 667 } 668 void set_source_file_name_index(u2 sourcefile_index) { 669 _source_file_name_index = sourcefile_index; 670 } 671 672 // minor and major version numbers of class file 673 u2 minor_version() const { return _minor_version; } 674 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 675 u2 major_version() const { return _major_version; } 676 void set_major_version(u2 major_version) { _major_version = major_version; } 677 678 // source debug extension 679 const char* source_debug_extension() const { return _source_debug_extension; } 680 void set_source_debug_extension(const char* array, int length); 681 682 // symbol unloading support (refcount already added) 683 Symbol* array_name() { return _array_name; } 684 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; } 685 686 // nonstatic oop-map blocks 687 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 688 return oop_map_count * OopMapBlock::size_in_words(); 689 } 690 unsigned int nonstatic_oop_map_count() const { 691 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 692 } 693 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 694 void set_nonstatic_oop_map_size(int words) { 695 _nonstatic_oop_map_size = words; 696 } 697 698 #if INCLUDE_JVMTI 699 // Redefinition locking. Class can only be redefined by one thread at a time. 700 bool is_being_redefined() const { return _is_being_redefined; } 701 void set_is_being_redefined(bool value) { _is_being_redefined = value; } 702 703 // RedefineClasses() support for previous versions: 704 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 705 void purge_previous_version_list(); 706 707 InstanceKlass* previous_versions() const { return _previous_versions; } 708 #else 709 InstanceKlass* previous_versions() const { return NULL; } 710 #endif 711 712 InstanceKlass* get_klass_version(int version) { 713 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 714 if (ik->constants()->version() == version) { 715 return ik; 716 } 717 } 718 return NULL; 719 } 720 721 bool has_been_redefined() const { 722 return (_misc_flags & _misc_has_been_redefined) != 0; 723 } 724 void set_has_been_redefined() { 725 _misc_flags |= _misc_has_been_redefined; 726 } 727 728 bool has_passed_fingerprint_check() const { 729 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0; 730 } 731 void set_has_passed_fingerprint_check(bool b) { 732 if (b) { 733 _misc_flags |= _misc_has_passed_fingerprint_check; 734 } else { 735 _misc_flags &= ~_misc_has_passed_fingerprint_check; 736 } 737 } 738 bool supers_have_passed_fingerprint_checks(); 739 740 static bool should_store_fingerprint(bool is_anonymous); 741 bool should_store_fingerprint() const { return should_store_fingerprint(is_anonymous()); } 742 bool has_stored_fingerprint() const; 743 uint64_t get_stored_fingerprint() const; 744 void store_fingerprint(uint64_t fingerprint); 745 746 bool is_scratch_class() const { 747 return (_misc_flags & _misc_is_scratch_class) != 0; 748 } 749 750 void set_is_scratch_class() { 751 _misc_flags |= _misc_is_scratch_class; 752 } 753 754 bool has_resolved_methods() const { 755 return (_misc_flags & _misc_has_resolved_methods) != 0; 756 } 757 758 void set_has_resolved_methods() { 759 _misc_flags |= _misc_has_resolved_methods; 760 } 761 private: 762 763 void set_kind(unsigned kind) { 764 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind"); 765 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos; 766 unsigned flags = _misc_flags & ~fmask; 767 _misc_flags = (flags | (kind << _misc_kind_field_pos)); 768 } 769 770 bool is_kind(unsigned desired) const { 771 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask; 772 return kind == desired; 773 } 774 775 public: 776 777 // Other is anything that is not one of the more specialized kinds of InstanceKlass. 778 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); } 779 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); } 780 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); } 781 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); } 782 783 #if INCLUDE_JVMTI 784 785 void init_previous_versions() { 786 _previous_versions = NULL; 787 } 788 789 private: 790 static bool _has_previous_versions; 791 public: 792 static void purge_previous_versions(InstanceKlass* ik) { 793 if (ik->has_been_redefined()) { 794 ik->purge_previous_version_list(); 795 } 796 } 797 798 static bool has_previous_versions_and_reset(); 799 800 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 801 void set_cached_class_file(JvmtiCachedClassFileData *data) { 802 _cached_class_file = data; 803 } 804 JvmtiCachedClassFileData * get_cached_class_file(); 805 jint get_cached_class_file_len(); 806 unsigned char * get_cached_class_file_bytes(); 807 808 // JVMTI: Support for caching of field indices, types, and offsets 809 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 810 _jvmti_cached_class_field_map = descriptor; 811 } 812 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 813 return _jvmti_cached_class_field_map; 814 } 815 816 #if INCLUDE_CDS 817 void set_archived_class_data(JvmtiCachedClassFileData* data) { 818 _cached_class_file = data; 819 } 820 821 JvmtiCachedClassFileData * get_archived_class_data(); 822 #endif // INCLUDE_CDS 823 #else // INCLUDE_JVMTI 824 825 static void purge_previous_versions(InstanceKlass* ik) { return; }; 826 static bool has_previous_versions_and_reset() { return false; } 827 828 void set_cached_class_file(JvmtiCachedClassFileData *data) { 829 assert(data == NULL, "unexpected call with JVMTI disabled"); 830 } 831 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; } 832 833 #endif // INCLUDE_JVMTI 834 835 bool has_nonstatic_concrete_methods() const { 836 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0; 837 } 838 void set_has_nonstatic_concrete_methods(bool b) { 839 if (b) { 840 _misc_flags |= _misc_has_nonstatic_concrete_methods; 841 } else { 842 _misc_flags &= ~_misc_has_nonstatic_concrete_methods; 843 } 844 } 845 846 bool declares_nonstatic_concrete_methods() const { 847 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0; 848 } 849 void set_declares_nonstatic_concrete_methods(bool b) { 850 if (b) { 851 _misc_flags |= _misc_declares_nonstatic_concrete_methods; 852 } else { 853 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods; 854 } 855 } 856 857 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 858 inline u2 next_method_idnum(); 859 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 860 861 // generics support 862 Symbol* generic_signature() const { 863 return (_generic_signature_index == 0) ? 864 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index); 865 } 866 u2 generic_signature_index() const { 867 return _generic_signature_index; 868 } 869 void set_generic_signature_index(u2 sig_index) { 870 _generic_signature_index = sig_index; 871 } 872 873 u2 enclosing_method_data(int offset) const; 874 u2 enclosing_method_class_index() const { 875 return enclosing_method_data(enclosing_method_class_index_offset); 876 } 877 u2 enclosing_method_method_index() { 878 return enclosing_method_data(enclosing_method_method_index_offset); 879 } 880 void set_enclosing_method_indices(u2 class_index, 881 u2 method_index); 882 883 // jmethodID support 884 jmethodID get_jmethod_id(const methodHandle& method_h); 885 jmethodID get_jmethod_id_fetch_or_update(size_t idnum, 886 jmethodID new_id, jmethodID* new_jmeths, 887 jmethodID* to_dealloc_id_p, 888 jmethodID** to_dealloc_jmeths_p); 889 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 890 size_t *length_p, jmethodID* id_p); 891 void ensure_space_for_methodids(int start_offset = 0); 892 jmethodID jmethod_id_or_null(Method* method); 893 894 // annotations support 895 Annotations* annotations() const { return _annotations; } 896 void set_annotations(Annotations* anno) { _annotations = anno; } 897 898 AnnotationArray* class_annotations() const { 899 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 900 } 901 Array<AnnotationArray*>* fields_annotations() const { 902 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 903 } 904 AnnotationArray* class_type_annotations() const { 905 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 906 } 907 Array<AnnotationArray*>* fields_type_annotations() const { 908 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 909 } 910 // allocation 911 instanceOop allocate_instance(TRAPS); 912 913 // additional member function to return a handle 914 instanceHandle allocate_instance_handle(TRAPS); 915 916 objArrayOop allocate_objArray(int n, int length, TRAPS); 917 // Helper function 918 static instanceOop register_finalizer(instanceOop i, TRAPS); 919 920 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 921 // if not, throw either an Error or an Exception. 922 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 923 924 // initialization 925 void call_class_initializer(TRAPS); 926 void set_initialization_state_and_notify(ClassState state, TRAPS); 927 928 // OopMapCache support 929 OopMapCache* oop_map_cache() { return _oop_map_cache; } 930 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 931 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 932 933 // JNI identifier support (for static fields - for jni performance) 934 JNIid* jni_ids() { return _jni_ids; } 935 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 936 JNIid* jni_id_for(int offset); 937 938 // maintenance of deoptimization dependencies 939 inline DependencyContext dependencies(); 940 int mark_dependent_nmethods(KlassDepChange& changes); 941 void add_dependent_nmethod(nmethod* nm); 942 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately); 943 944 // On-stack replacement support 945 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 946 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 947 void add_osr_nmethod(nmethod* n); 948 bool remove_osr_nmethod(nmethod* n); 949 int mark_osr_nmethods(const Method* m); 950 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 951 952 #if INCLUDE_JVMTI 953 // Breakpoint support (see methods on Method* for details) 954 BreakpointInfo* breakpoints() const { return _breakpoints; }; 955 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 956 #endif 957 958 // support for stub routines 959 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 960 TRACE_DEFINE_KLASS_TRACE_ID_OFFSET; 961 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 962 963 // subclass/subinterface checks 964 bool implements_interface(Klass* k) const; 965 bool is_same_or_direct_interface(Klass* k) const; 966 967 #ifdef ASSERT 968 // check whether this class or one of its superclasses was redefined 969 bool has_redefined_this_or_super() const; 970 #endif 971 972 // Access to the implementor of an interface. 973 Klass* implementor() const 974 { 975 Klass** k = adr_implementor(); 976 if (k == NULL) { 977 return NULL; 978 } else { 979 return *k; 980 } 981 } 982 983 void set_implementor(Klass* k) { 984 assert(is_interface(), "not interface"); 985 Klass** addr = adr_implementor(); 986 assert(addr != NULL, "null addr"); 987 if (addr != NULL) { 988 *addr = k; 989 } 990 } 991 992 int nof_implementors() const { 993 Klass* k = implementor(); 994 if (k == NULL) { 995 return 0; 996 } else if (k != this) { 997 return 1; 998 } else { 999 return 2; 1000 } 1001 } 1002 1003 void add_implementor(Klass* k); // k is a new class that implements this interface 1004 void init_implementor(); // initialize 1005 1006 // link this class into the implementors list of every interface it implements 1007 void process_interfaces(Thread *thread); 1008 1009 // virtual operations from Klass 1010 bool is_leaf_class() const { return _subklass == NULL; } 1011 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); 1012 bool compute_is_subtype_of(Klass* k); 1013 bool can_be_primary_super_slow() const; 1014 int oop_size(oop obj) const { return size_helper(); } 1015 // slow because it's a virtual call and used for verifying the layout_helper. 1016 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 1017 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 1018 1019 // Iterators 1020 void do_local_static_fields(FieldClosure* cl); 1021 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 1022 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 1023 1024 void methods_do(void f(Method* method)); 1025 void array_klasses_do(void f(Klass* k)); 1026 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 1027 bool super_types_do(SuperTypeClosure* blk); 1028 1029 static InstanceKlass* cast(Klass* k) { 1030 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 1031 } 1032 1033 static const InstanceKlass* cast(const Klass* k) { 1034 assert(k != NULL, "k should not be null"); 1035 assert(k->is_instance_klass(), "cast to InstanceKlass"); 1036 return static_cast<const InstanceKlass*>(k); 1037 } 1038 1039 InstanceKlass* java_super() const { 1040 return (super() == NULL) ? NULL : cast(super()); 1041 } 1042 1043 // Sizing (in words) 1044 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 1045 1046 static int size(int vtable_length, int itable_length, 1047 int nonstatic_oop_map_size, 1048 bool is_interface, bool is_anonymous, bool has_stored_fingerprint) { 1049 return align_metadata_size(header_size() + 1050 vtable_length + 1051 itable_length + 1052 nonstatic_oop_map_size + 1053 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) + 1054 (is_anonymous ? (int)sizeof(Klass*)/wordSize : 0) + 1055 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0)); 1056 } 1057 int size() const { return size(vtable_length(), 1058 itable_length(), 1059 nonstatic_oop_map_size(), 1060 is_interface(), 1061 is_anonymous(), 1062 has_stored_fingerprint()); 1063 } 1064 #if INCLUDE_SERVICES 1065 virtual void collect_statistics(KlassSizeStats *sz) const; 1066 #endif 1067 1068 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); } 1069 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 1070 1071 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 1072 1073 oop static_field_base_raw() { return java_mirror(); } 1074 1075 OopMapBlock* start_of_nonstatic_oop_maps() const { 1076 return (OopMapBlock*)(start_of_itable() + itable_length()); 1077 } 1078 1079 Klass** end_of_nonstatic_oop_maps() const { 1080 return (Klass**)(start_of_nonstatic_oop_maps() + 1081 nonstatic_oop_map_count()); 1082 } 1083 1084 Klass** adr_implementor() const { 1085 if (is_interface()) { 1086 return (Klass**)end_of_nonstatic_oop_maps(); 1087 } else { 1088 return NULL; 1089 } 1090 }; 1091 1092 InstanceKlass** adr_host_klass() const { 1093 if (is_anonymous()) { 1094 InstanceKlass** adr_impl = (InstanceKlass **)adr_implementor(); 1095 if (adr_impl != NULL) { 1096 return adr_impl + 1; 1097 } else { 1098 return (InstanceKlass **)end_of_nonstatic_oop_maps(); 1099 } 1100 } else { 1101 return NULL; 1102 } 1103 } 1104 1105 address adr_fingerprint() const { 1106 if (has_stored_fingerprint()) { 1107 InstanceKlass** adr_host = adr_host_klass(); 1108 if (adr_host != NULL) { 1109 return (address)(adr_host + 1); 1110 } 1111 1112 Klass** adr_impl = adr_implementor(); 1113 if (adr_impl != NULL) { 1114 return (address)(adr_impl + 1); 1115 } 1116 1117 return (address)end_of_nonstatic_oop_maps(); 1118 } else { 1119 return NULL; 1120 } 1121 } 1122 1123 // Use this to return the size of an instance in heap words: 1124 int size_helper() const { 1125 return layout_helper_to_size_helper(layout_helper()); 1126 } 1127 1128 // This bit is initialized in classFileParser.cpp. 1129 // It is false under any of the following conditions: 1130 // - the class is abstract (including any interface) 1131 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1132 // - the class size is larger than FastAllocateSizeLimit 1133 // - the class is java/lang/Class, which cannot be allocated directly 1134 bool can_be_fastpath_allocated() const { 1135 return !layout_helper_needs_slow_path(layout_helper()); 1136 } 1137 1138 // Java itable 1139 klassItable itable() const; // return klassItable wrapper 1140 Method* method_at_itable(Klass* holder, int index, TRAPS); 1141 1142 #if INCLUDE_JVMTI 1143 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed); 1144 #endif // INCLUDE_JVMTI 1145 1146 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive); 1147 void clean_implementors_list(BoolObjectClosure* is_alive); 1148 void clean_method_data(BoolObjectClosure* is_alive); 1149 1150 // Explicit metaspace deallocation of fields 1151 // For RedefineClasses and class file parsing errors, we need to deallocate 1152 // instanceKlasses and the metadata they point to. 1153 void deallocate_contents(ClassLoaderData* loader_data); 1154 static void deallocate_methods(ClassLoaderData* loader_data, 1155 Array<Method*>* methods); 1156 void static deallocate_interfaces(ClassLoaderData* loader_data, 1157 const Klass* super_klass, 1158 Array<Klass*>* local_interfaces, 1159 Array<Klass*>* transitive_interfaces); 1160 1161 // The constant pool is on stack if any of the methods are executing or 1162 // referenced by handles. 1163 bool on_stack() const { return _constants->on_stack(); } 1164 1165 // callbacks for actions during class unloading 1166 static void notify_unload_class(InstanceKlass* ik); 1167 static void release_C_heap_structures(InstanceKlass* ik); 1168 1169 // Naming 1170 const char* signature_name() const; 1171 static Symbol* package_from_name(const Symbol* name, TRAPS); 1172 1173 // GC specific object visitors 1174 // 1175 #if INCLUDE_ALL_GCS 1176 // Parallel Scavenge 1177 void oop_ps_push_contents( oop obj, PSPromotionManager* pm); 1178 // Parallel Compact 1179 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm); 1180 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm); 1181 #endif 1182 1183 // Oop fields (and metadata) iterators 1184 // [nv = true] Use non-virtual calls to do_oop_nv. 1185 // [nv = false] Use virtual calls to do_oop. 1186 // 1187 // The InstanceKlass iterators also visits the Object's klass. 1188 1189 // Forward iteration 1190 public: 1191 // Iterate over all oop fields in the oop maps. 1192 template <bool nv, class OopClosureType> 1193 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1194 1195 protected: 1196 // Iterate over all oop fields and metadata. 1197 template <bool nv, class OopClosureType> 1198 inline int oop_oop_iterate(oop obj, OopClosureType* closure); 1199 1200 private: 1201 // Iterate over all oop fields in the oop maps. 1202 // Specialized for [T = oop] or [T = narrowOop]. 1203 template <bool nv, typename T, class OopClosureType> 1204 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure); 1205 1206 // Iterate over all oop fields in one oop map. 1207 template <bool nv, typename T, class OopClosureType> 1208 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1209 1210 1211 // Reverse iteration 1212 #if INCLUDE_ALL_GCS 1213 public: 1214 // Iterate over all oop fields in the oop maps. 1215 template <bool nv, class OopClosureType> 1216 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1217 1218 protected: 1219 // Iterate over all oop fields and metadata. 1220 template <bool nv, class OopClosureType> 1221 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1222 1223 private: 1224 // Iterate over all oop fields in the oop maps. 1225 // Specialized for [T = oop] or [T = narrowOop]. 1226 template <bool nv, typename T, class OopClosureType> 1227 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure); 1228 1229 // Iterate over all oop fields in one oop map. 1230 template <bool nv, typename T, class OopClosureType> 1231 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1232 #endif 1233 1234 1235 // Bounded range iteration 1236 public: 1237 // Iterate over all oop fields in the oop maps. 1238 template <bool nv, class OopClosureType> 1239 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1240 1241 protected: 1242 // Iterate over all oop fields and metadata. 1243 template <bool nv, class OopClosureType> 1244 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1245 1246 private: 1247 // Iterate over all oop fields in the oop maps. 1248 // Specialized for [T = oop] or [T = narrowOop]. 1249 template <bool nv, typename T, class OopClosureType> 1250 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1251 1252 // Iterate over all oop fields in one oop map. 1253 template <bool nv, typename T, class OopClosureType> 1254 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1255 1256 1257 public: 1258 1259 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL) 1260 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL) 1261 1262 #if INCLUDE_ALL_GCS 1263 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS) 1264 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS) 1265 #endif // INCLUDE_ALL_GCS 1266 1267 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1268 1269 public: 1270 void set_in_error_state() { 1271 assert(DumpSharedSpaces, "only call this when dumping archive"); 1272 _init_state = initialization_error; 1273 } 1274 bool check_sharing_error_state(); 1275 1276 private: 1277 // initialization state 1278 #ifdef ASSERT 1279 void set_init_state(ClassState state); 1280 #else 1281 void set_init_state(ClassState state) { _init_state = (u1)state; } 1282 #endif 1283 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1284 void set_init_thread(Thread *thread) { _init_thread = thread; } 1285 1286 // The RedefineClasses() API can cause new method idnums to be needed 1287 // which will cause the caches to grow. Safety requires different 1288 // cache management logic if the caches can grow instead of just 1289 // going from NULL to non-NULL. 1290 bool idnum_can_increment() const { return has_been_redefined(); } 1291 inline jmethodID* methods_jmethod_ids_acquire() const; 1292 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1293 1294 // Lock during initialization 1295 public: 1296 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1297 // Must be one per class and it has to be a VM internal object so java code 1298 // cannot lock it (like the mirror). 1299 // It has to be an object not a Mutex because it's held through java calls. 1300 oop init_lock() const; 1301 private: 1302 void fence_and_clear_init_lock(); 1303 1304 bool link_class_impl (bool throw_verifyerror, TRAPS); 1305 bool verify_code (bool throw_verifyerror, TRAPS); 1306 void initialize_impl (TRAPS); 1307 void initialize_super_interfaces (TRAPS); 1308 void eager_initialize_impl (); 1309 /* jni_id_for_impl for jfieldID only */ 1310 JNIid* jni_id_for_impl (int offset); 1311 1312 // Returns the array class for the n'th dimension 1313 Klass* array_klass_impl(bool or_null, int n, TRAPS); 1314 1315 // Returns the array class with this class as element type 1316 Klass* array_klass_impl(bool or_null, TRAPS); 1317 1318 // find a local method (returns NULL if not found) 1319 Method* find_method_impl(const Symbol* name, 1320 const Symbol* signature, 1321 OverpassLookupMode overpass_mode, 1322 StaticLookupMode static_mode, 1323 PrivateLookupMode private_mode) const; 1324 1325 static Method* find_method_impl(const Array<Method*>* methods, 1326 const Symbol* name, 1327 const Symbol* signature, 1328 OverpassLookupMode overpass_mode, 1329 StaticLookupMode static_mode, 1330 PrivateLookupMode private_mode); 1331 1332 // Free CHeap allocated fields. 1333 void release_C_heap_structures(); 1334 1335 #if INCLUDE_JVMTI 1336 // RedefineClasses support 1337 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1338 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1339 #endif 1340 public: 1341 // CDS support - remove and restore oops from metadata. Oops are not shared. 1342 virtual void remove_unshareable_info(); 1343 virtual void remove_java_mirror(); 1344 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 1345 1346 // jvm support 1347 jint compute_modifier_flags(TRAPS) const; 1348 1349 public: 1350 // JVMTI support 1351 jint jvmti_class_status() const; 1352 1353 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 1354 1355 public: 1356 // Printing 1357 #ifndef PRODUCT 1358 void print_on(outputStream* st) const; 1359 #endif 1360 void print_value_on(outputStream* st) const; 1361 1362 void oop_print_value_on(oop obj, outputStream* st); 1363 1364 #ifndef PRODUCT 1365 void oop_print_on (oop obj, outputStream* st); 1366 1367 void print_dependent_nmethods(bool verbose = false); 1368 bool is_dependent_nmethod(nmethod* nm); 1369 #endif 1370 1371 const char* internal_name() const; 1372 1373 // Verification 1374 void verify_on(outputStream* st); 1375 1376 void oop_verify_on(oop obj, outputStream* st); 1377 1378 // Logging 1379 void print_class_load_logging(ClassLoaderData* loader_data, 1380 const char* module_name, 1381 const ClassFileStream* cfs) const; 1382 }; 1383 1384 // for adding methods 1385 // UNSET_IDNUM return means no more ids available 1386 inline u2 InstanceKlass::next_method_idnum() { 1387 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1388 return ConstMethod::UNSET_IDNUM; // no more ids available 1389 } else { 1390 return _idnum_allocated_count++; 1391 } 1392 } 1393 1394 1395 /* JNIid class for jfieldIDs only */ 1396 class JNIid: public CHeapObj<mtClass> { 1397 friend class VMStructs; 1398 private: 1399 Klass* _holder; 1400 JNIid* _next; 1401 int _offset; 1402 #ifdef ASSERT 1403 bool _is_static_field_id; 1404 #endif 1405 1406 public: 1407 // Accessors 1408 Klass* holder() const { return _holder; } 1409 int offset() const { return _offset; } 1410 JNIid* next() { return _next; } 1411 // Constructor 1412 JNIid(Klass* holder, int offset, JNIid* next); 1413 // Identifier lookup 1414 JNIid* find(int offset); 1415 1416 bool find_local_field(fieldDescriptor* fd) { 1417 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1418 } 1419 1420 static void deallocate(JNIid* id); 1421 // Debugging 1422 #ifdef ASSERT 1423 bool is_static_field_id() const { return _is_static_field_id; } 1424 void set_is_static_field_id() { _is_static_field_id = true; } 1425 #endif 1426 void verify(Klass* holder); 1427 }; 1428 1429 // An iterator that's used to access the inner classes indices in the 1430 // InstanceKlass::_inner_classes array. 1431 class InnerClassesIterator : public StackObj { 1432 private: 1433 Array<jushort>* _inner_classes; 1434 int _length; 1435 int _idx; 1436 public: 1437 1438 InnerClassesIterator(const InstanceKlass* k) { 1439 _inner_classes = k->inner_classes(); 1440 if (k->inner_classes() != NULL) { 1441 _length = _inner_classes->length(); 1442 // The inner class array's length should be the multiple of 1443 // inner_class_next_offset if it only contains the InnerClasses 1444 // attribute data, or it should be 1445 // n*inner_class_next_offset+enclosing_method_attribute_size 1446 // if it also contains the EnclosingMethod data. 1447 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1448 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1449 "just checking"); 1450 // Remove the enclosing_method portion if exists. 1451 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1452 _length -= InstanceKlass::enclosing_method_attribute_size; 1453 } 1454 } else { 1455 _length = 0; 1456 } 1457 _idx = 0; 1458 } 1459 1460 int length() const { 1461 return _length; 1462 } 1463 1464 void next() { 1465 _idx += InstanceKlass::inner_class_next_offset; 1466 } 1467 1468 bool done() const { 1469 return (_idx >= _length); 1470 } 1471 1472 u2 inner_class_info_index() const { 1473 return _inner_classes->at( 1474 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1475 } 1476 1477 void set_inner_class_info_index(u2 index) { 1478 _inner_classes->at_put( 1479 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1480 } 1481 1482 u2 outer_class_info_index() const { 1483 return _inner_classes->at( 1484 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1485 } 1486 1487 void set_outer_class_info_index(u2 index) { 1488 _inner_classes->at_put( 1489 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1490 } 1491 1492 u2 inner_name_index() const { 1493 return _inner_classes->at( 1494 _idx + InstanceKlass::inner_class_inner_name_offset); 1495 } 1496 1497 void set_inner_name_index(u2 index) { 1498 _inner_classes->at_put( 1499 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1500 } 1501 1502 u2 inner_access_flags() const { 1503 return _inner_classes->at( 1504 _idx + InstanceKlass::inner_class_access_flags_offset); 1505 } 1506 }; 1507 1508 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP