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