1 /* 2 * Copyright (c) 1997, 2016, 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 "logging/logLevel.hpp" 34 #include "memory/referenceType.hpp" 35 #include "oops/annotations.hpp" 36 #include "oops/constMethod.hpp" 37 #include "oops/fieldInfo.hpp" 38 #include "oops/instanceOop.hpp" 39 #include "oops/klassVtable.hpp" 40 #include "runtime/handles.hpp" 41 #include "runtime/os.hpp" 42 #include "trace/traceMacros.hpp" 43 #include "utilities/accessFlags.hpp" 44 #include "utilities/bitMap.inline.hpp" 45 #include "utilities/macros.hpp" 46 47 // An InstanceKlass is the VM level representation of a Java class. 48 // It contains all information needed for at class at execution runtime. 49 50 // InstanceKlass embedded field layout (after declared fields): 51 // [EMBEDDED Java vtable ] size in words = vtable_len 52 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size 53 // The embedded nonstatic oop-map blocks are short pairs (offset, length) 54 // indicating where oops are located in instances of this klass. 55 // [EMBEDDED implementor of the interface] only exist for interface 56 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled) 57 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 MemberNameTable; 71 class SuperTypeClosure; 72 73 // This is used in iterators below. 74 class FieldClosure: public StackObj { 75 public: 76 virtual void do_field(fieldDescriptor* fd) = 0; 77 }; 78 79 #ifndef PRODUCT 80 // Print fields. 81 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. 82 class FieldPrinter: public FieldClosure { 83 oop _obj; 84 outputStream* _st; 85 public: 86 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} 87 void do_field(fieldDescriptor* fd); 88 }; 89 #endif // !PRODUCT 90 91 // ValueObjs embedded in klass. Describes where oops are located in instances of 92 // this klass. 93 class OopMapBlock VALUE_OBJ_CLASS_SPEC { 94 public: 95 // Byte offset of the first oop mapped by this block. 96 int offset() const { return _offset; } 97 void set_offset(int offset) { _offset = offset; } 98 99 // Number of oops in this block. 100 uint count() const { return _count; } 101 void set_count(uint count) { _count = count; } 102 103 // sizeof(OopMapBlock) in words. 104 static const int size_in_words() { 105 return align_size_up(int(sizeof(OopMapBlock)), wordSize) >> 106 LogBytesPerWord; 107 } 108 109 private: 110 int _offset; 111 uint _count; 112 }; 113 114 struct JvmtiCachedClassFileData; 115 116 class InstanceKlass: public Klass { 117 friend class VMStructs; 118 friend class JVMCIVMStructs; 119 friend class ClassFileParser; 120 friend class CompileReplay; 121 122 protected: 123 InstanceKlass(const ClassFileParser& parser, unsigned kind); 124 125 public: 126 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } 127 128 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 129 // of the class loading & initialization procedure, and the use of the states. 130 enum ClassState { 131 allocated, // allocated (but not yet linked) 132 loaded, // loaded and inserted in class hierarchy (but not linked yet) 133 linked, // successfully linked/verified (but not initialized yet) 134 being_initialized, // currently running class initializer 135 fully_initialized, // initialized (successfull final state) 136 initialization_error // error happened during initialization 137 }; 138 139 static int number_of_instance_classes() { return _total_instanceKlass_count; } 140 141 private: 142 static volatile int _total_instanceKlass_count; 143 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS); 144 145 protected: 146 // Annotations for this class 147 Annotations* _annotations; 148 // Package this class is defined in 149 PackageEntry* _package_entry; 150 // Array classes holding elements of this class. 151 Klass* volatile _array_klasses; 152 // Constant pool for this class. 153 ConstantPool* _constants; 154 // The InnerClasses attribute and EnclosingMethod attribute. The 155 // _inner_classes is an array of shorts. If the class has InnerClasses 156 // attribute, then the _inner_classes array begins with 4-tuples of shorts 157 // [inner_class_info_index, outer_class_info_index, 158 // inner_name_index, inner_class_access_flags] for the InnerClasses 159 // attribute. If the EnclosingMethod attribute exists, it occupies the 160 // last two shorts [class_index, method_index] of the array. If only 161 // the InnerClasses attribute exists, the _inner_classes array length is 162 // number_of_inner_classes * 4. If the class has both InnerClasses 163 // and EnclosingMethod attributes the _inner_classes array length is 164 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 165 Array<jushort>* _inner_classes; 166 167 // the source debug extension for this klass, NULL if not specified. 168 // Specified as UTF-8 string without terminating zero byte in the classfile, 169 // it is stored in the instanceklass as a NULL-terminated UTF-8 string 170 const char* _source_debug_extension; 171 // Array name derived from this class which needs unreferencing 172 // if this class is unloaded. 173 Symbol* _array_name; 174 175 // Number of heapOopSize words used by non-static fields in this klass 176 // (including inherited fields but after header_size()). 177 int _nonstatic_field_size; 178 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 179 // Constant pool index to the utf8 entry of the Generic signature, 180 // or 0 if none. 181 u2 _generic_signature_index; 182 // Constant pool index to the utf8 entry for the name of source file 183 // containing this klass, 0 if not specified. 184 u2 _source_file_name_index; 185 u2 _static_oop_field_count;// number of static oop fields in this klass 186 u2 _java_fields_count; // The number of declared Java fields 187 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 188 189 int _itable_len; // length of Java itable (in words) 190 // _is_marked_dependent can be set concurrently, thus cannot be part of the 191 // _misc_flags. 192 bool _is_marked_dependent; // used for marking during flushing and deoptimization 193 bool _is_being_redefined; // used for locking redefinition 194 195 // The low two bits of _misc_flags contains the kind field. 196 // This can be used to quickly discriminate among the four kinds of 197 // InstanceKlass. 198 199 static const unsigned _misc_kind_field_size = 2; 200 static const unsigned _misc_kind_field_pos = 0; 201 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u; 202 203 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass 204 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass 205 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass 206 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass 207 208 // Start after _misc_kind field. 209 enum { 210 _misc_rewritten = 1 << 2, // methods rewritten. 211 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops 212 _misc_should_verify_class = 1 << 4, // allow caching of preverification 213 _misc_is_anonymous = 1 << 5, // has embedded _host_klass field 214 _misc_is_contended = 1 << 6, // marked with contended annotation 215 _misc_has_nonstatic_concrete_methods = 1 << 7, // class/superclass/implemented interfaces has non-static, concrete methods 216 _misc_declares_nonstatic_concrete_methods = 1 << 8, // directly declares non-static, concrete methods 217 _misc_has_been_redefined = 1 << 9, // class has been redefined 218 _misc_is_scratch_class = 1 << 10, // class is the redefined scratch class 219 _misc_is_shared_boot_class = 1 << 11, // defining class loader is boot class loader 220 _misc_is_shared_platform_class = 1 << 12, // defining class loader is platform class loader 221 _misc_is_shared_app_class = 1 << 13 // defining class loader is app class loader 222 }; 223 u2 loader_type_bits() { 224 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class; 225 } 226 u2 _misc_flags; 227 u2 _minor_version; // minor version number of class file 228 u2 _major_version; // major version number of class file 229 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) 230 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 231 MemberNameTable* _member_names; // Member names 232 JNIid* _jni_ids; // First JNI identifier for static fields in this class 233 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 234 intptr_t _dep_context; // packed DependencyContext structure 235 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 236 #if INCLUDE_JVMTI 237 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 238 // Linked instanceKlasses of previous versions 239 InstanceKlass* _previous_versions; 240 // JVMTI fields can be moved to their own structure - see 6315920 241 // JVMTI: cached class file, before retransformable agent modified it in CFLH 242 JvmtiCachedClassFileData* _cached_class_file; 243 #endif 244 245 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 246 247 // Class states are defined as ClassState (see above). 248 // Place the _init_state here to utilize the unused 2-byte after 249 // _idnum_allocated_count. 250 u1 _init_state; // state of class 251 u1 _reference_type; // reference type 252 253 #if INCLUDE_JVMTI 254 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 255 #endif 256 257 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 258 259 // Method array. 260 Array<Method*>* _methods; 261 // Default Method Array, concrete methods inherited from interfaces 262 Array<Method*>* _default_methods; 263 // Interface (Klass*s) this class declares locally to implement. 264 Array<Klass*>* _local_interfaces; 265 // Interface (Klass*s) this class implements transitively. 266 Array<Klass*>* _transitive_interfaces; 267 // Int array containing the original order of method in the class file (for JVMTI). 268 Array<int>* _method_ordering; 269 // Int array containing the vtable_indices for default_methods 270 // offset matches _default_methods offset 271 Array<int>* _default_vtable_indices; 272 273 // Instance and static variable information, starts with 6-tuples of shorts 274 // [access, name index, sig index, initval index, low_offset, high_offset] 275 // for all fields, followed by the generic signature data at the end of 276 // the array. Only fields with generic signature attributes have the generic 277 // signature data set in the array. The fields array looks like following: 278 // 279 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 280 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 281 // ... 282 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 283 // [generic signature index] 284 // [generic signature index] 285 // ... 286 Array<u2>* _fields; 287 288 // embedded Java vtable follows here 289 // embedded Java itables follows here 290 // embedded static fields follows here 291 // embedded nonstatic oop-map blocks follows here 292 // embedded implementor of this interface follows here 293 // The embedded implementor only exists if the current klass is an 294 // iterface. The possible values of the implementor fall into following 295 // three cases: 296 // NULL: no implementor. 297 // A Klass* that's not itself: one implementor. 298 // Itself: more than one implementors. 299 // embedded host klass follows here 300 // The embedded host klass only exists in an anonymous class for 301 // dynamic language support (JSR 292 enabled). The host class grants 302 // its access privileges to this class also. The host class is either 303 // named, or a previously loaded anonymous class. A non-anonymous class 304 // or an anonymous class loaded through normal classloading does not 305 // have this embedded field. 306 // 307 308 friend class SystemDictionary; 309 310 public: 311 u2 loader_type() { 312 return _misc_flags & loader_type_bits(); 313 } 314 315 bool is_shared_boot_class() const { 316 return (_misc_flags & _misc_is_shared_boot_class) != 0; 317 } 318 bool is_shared_platform_class() const { 319 return (_misc_flags & _misc_is_shared_platform_class) != 0; 320 } 321 bool is_shared_app_class() const { 322 return (_misc_flags & _misc_is_shared_app_class) != 0; 323 } 324 325 void set_class_loader_type(s2 loader_type) { 326 assert(( _misc_flags & loader_type_bits()) == 0, 327 "Should only be called once for each class."); 328 switch (loader_type) { 329 case ClassLoader::BOOT_LOADER: 330 _misc_flags |= _misc_is_shared_boot_class; 331 break; 332 case ClassLoader::PLATFORM_LOADER: 333 _misc_flags |= _misc_is_shared_platform_class; 334 break; 335 case ClassLoader::APP_LOADER: 336 _misc_flags |= _misc_is_shared_app_class; 337 break; 338 default: 339 ShouldNotReachHere(); 340 break; 341 } 342 } 343 344 bool has_nonstatic_fields() const { 345 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 346 } 347 void set_has_nonstatic_fields(bool b) { 348 if (b) { 349 _misc_flags |= _misc_has_nonstatic_fields; 350 } else { 351 _misc_flags &= ~_misc_has_nonstatic_fields; 352 } 353 } 354 355 // field sizes 356 int nonstatic_field_size() const { return _nonstatic_field_size; } 357 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 358 359 int static_field_size() const { return _static_field_size; } 360 void set_static_field_size(int size) { _static_field_size = size; } 361 362 int static_oop_field_count() const { return (int)_static_oop_field_count; } 363 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 364 365 // Java itable 366 int itable_length() const { return _itable_len; } 367 void set_itable_length(int len) { _itable_len = len; } 368 369 // array klasses 370 Klass* array_klasses() const { return _array_klasses; } 371 inline Klass* array_klasses_acquire() const; // load with acquire semantics 372 void set_array_klasses(Klass* k) { _array_klasses = k; } 373 inline void release_set_array_klasses(Klass* k); // store with release semantics 374 375 // methods 376 Array<Method*>* methods() const { return _methods; } 377 void set_methods(Array<Method*>* a) { _methods = a; } 378 Method* method_with_idnum(int idnum); 379 Method* method_with_orig_idnum(int idnum); 380 Method* method_with_orig_idnum(int idnum, int version); 381 382 // method ordering 383 Array<int>* method_ordering() const { return _method_ordering; } 384 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 385 void copy_method_ordering(const intArray* m, TRAPS); 386 387 // default_methods 388 Array<Method*>* default_methods() const { return _default_methods; } 389 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 390 391 // default method vtable_indices 392 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 393 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 394 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 395 396 // interfaces 397 Array<Klass*>* local_interfaces() const { return _local_interfaces; } 398 void set_local_interfaces(Array<Klass*>* a) { 399 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 400 _local_interfaces = a; } 401 402 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; } 403 void set_transitive_interfaces(Array<Klass*>* a) { 404 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 405 _transitive_interfaces = a; 406 } 407 408 private: 409 friend class fieldDescriptor; 410 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 411 412 public: 413 int field_offset (int index) const { return field(index)->offset(); } 414 int field_access_flags(int index) const { return field(index)->access_flags(); } 415 Symbol* field_name (int index) const { return field(index)->name(constants()); } 416 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 417 418 // Number of Java declared fields 419 int java_fields_count() const { return (int)_java_fields_count; } 420 421 Array<u2>* fields() const { return _fields; } 422 void set_fields(Array<u2>* f, u2 java_fields_count) { 423 guarantee(_fields == NULL || f == NULL, "Just checking"); 424 _fields = f; 425 _java_fields_count = java_fields_count; 426 } 427 428 // inner classes 429 Array<u2>* inner_classes() const { return _inner_classes; } 430 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 431 432 enum InnerClassAttributeOffset { 433 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 434 inner_class_inner_class_info_offset = 0, 435 inner_class_outer_class_info_offset = 1, 436 inner_class_inner_name_offset = 2, 437 inner_class_access_flags_offset = 3, 438 inner_class_next_offset = 4 439 }; 440 441 enum EnclosingMethodAttributeOffset { 442 enclosing_method_class_index_offset = 0, 443 enclosing_method_method_index_offset = 1, 444 enclosing_method_attribute_size = 2 445 }; 446 447 // method override check 448 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 449 450 // package 451 PackageEntry* package() const { return _package_entry; } 452 ModuleEntry* module() const; 453 bool in_unnamed_package() const { return (_package_entry == NULL); } 454 void set_package(PackageEntry* p) { _package_entry = p; } 455 void set_package(ClassLoaderData* loader_data, TRAPS); 456 bool is_same_class_package(const Klass* class2) const; 457 bool is_same_class_package(oop classloader2, const Symbol* classname2) const; 458 static bool is_same_class_package(oop class_loader1, 459 const Symbol* class_name1, 460 oop class_loader2, 461 const Symbol* class_name2); 462 463 // find an enclosing class 464 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const { 465 return compute_enclosing_class_impl(this, inner_is_member, THREAD); 466 } 467 static InstanceKlass* compute_enclosing_class_impl(const InstanceKlass* self, 468 bool* inner_is_member, 469 TRAPS); 470 471 // Find InnerClasses attribute for k and return outer_class_info_index & inner_name_index. 472 static bool find_inner_classes_attr(instanceKlassHandle k, 473 int* ooff, int* noff, TRAPS); 474 475 private: 476 // Check prohibited package ("java/" only loadable by boot or platform loaders) 477 static void check_prohibited_package(Symbol* class_name, 478 Handle class_loader, 479 TRAPS); 480 public: 481 // tell if two classes have the same enclosing class (at package level) 482 bool is_same_package_member(const Klass* class2, TRAPS) const { 483 return is_same_package_member_impl(this, class2, THREAD); 484 } 485 static bool is_same_package_member_impl(const InstanceKlass* self, 486 const Klass* class2, 487 TRAPS); 488 489 // initialization state 490 bool is_loaded() const { return _init_state >= loaded; } 491 bool is_linked() const { return _init_state >= linked; } 492 bool is_initialized() const { return _init_state == fully_initialized; } 493 bool is_not_initialized() const { return _init_state < being_initialized; } 494 bool is_being_initialized() const { return _init_state == being_initialized; } 495 bool is_in_error_state() const { return _init_state == initialization_error; } 496 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 497 ClassState init_state() { return (ClassState)_init_state; } 498 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 499 500 // defineClass specified verification 501 bool should_verify_class() const { 502 return (_misc_flags & _misc_should_verify_class) != 0; 503 } 504 void set_should_verify_class(bool value) { 505 if (value) { 506 _misc_flags |= _misc_should_verify_class; 507 } else { 508 _misc_flags &= ~_misc_should_verify_class; 509 } 510 } 511 512 // marking 513 bool is_marked_dependent() const { return _is_marked_dependent; } 514 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 515 516 // initialization (virtuals from Klass) 517 bool should_be_initialized() const; // means that initialize should be called 518 void initialize(TRAPS); 519 void link_class(TRAPS); 520 bool link_class_or_fail(TRAPS); // returns false on failure 521 void unlink_class(); 522 void rewrite_class(TRAPS); 523 void link_methods(TRAPS); 524 Method* class_initializer(); 525 526 // set the class to initialized if no static initializer is present 527 void eager_initialize(Thread *thread); 528 529 // reference type 530 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 531 void set_reference_type(ReferenceType t) { 532 assert(t == (u1)t, "overflow"); 533 _reference_type = (u1)t; 534 } 535 536 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 537 538 // find local field, returns true if found 539 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 540 // find field in direct superinterfaces, returns the interface in which the field is defined 541 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 542 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 543 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 544 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 545 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 546 547 // find a non-static or static field given its offset within the class. 548 bool contains_field_offset(int offset) { 549 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); 550 } 551 552 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 553 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 554 555 // find a local method (returns NULL if not found) 556 Method* find_method(const Symbol* name, const Symbol* signature) const; 557 static Method* find_method(const Array<Method*>* methods, 558 const Symbol* name, 559 const Symbol* signature); 560 561 // find a local method, but skip static methods 562 Method* find_instance_method(const Symbol* name, const Symbol* signature) const; 563 static Method* find_instance_method(const Array<Method*>* methods, 564 const Symbol* name, 565 const Symbol* signature); 566 567 // find a local method (returns NULL if not found) 568 Method* find_local_method(const Symbol* name, 569 const Symbol* signature, 570 OverpassLookupMode overpass_mode, 571 StaticLookupMode static_mode, 572 PrivateLookupMode private_mode) const; 573 574 // find a local method from given methods array (returns NULL if not found) 575 static Method* find_local_method(const Array<Method*>* methods, 576 const Symbol* name, 577 const Symbol* signature, 578 OverpassLookupMode overpass_mode, 579 StaticLookupMode static_mode, 580 PrivateLookupMode private_mode); 581 582 // find a local method index in methods or default_methods (returns -1 if not found) 583 static int find_method_index(const Array<Method*>* methods, 584 const Symbol* name, 585 const Symbol* signature, 586 OverpassLookupMode overpass_mode, 587 StaticLookupMode static_mode, 588 PrivateLookupMode private_mode); 589 590 // lookup operation (returns NULL if not found) 591 Method* uncached_lookup_method(const Symbol* name, 592 const Symbol* signature, 593 OverpassLookupMode overpass_mode) const; 594 595 // lookup a method in all the interfaces that this class implements 596 // (returns NULL if not found) 597 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 598 599 // lookup a method in local defaults then in all interfaces 600 // (returns NULL if not found) 601 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 602 603 // Find method indices by name. If a method with the specified name is 604 // found the index to the first method is returned, and 'end' is filled in 605 // with the index of first non-name-matching method. If no method is found 606 // -1 is returned. 607 int find_method_by_name(const Symbol* name, int* end) const; 608 static int find_method_by_name(const Array<Method*>* methods, 609 const Symbol* name, int* end); 610 611 // constant pool 612 ConstantPool* constants() const { return _constants; } 613 void set_constants(ConstantPool* c) { _constants = c; } 614 615 // protection domain 616 oop protection_domain() const; 617 618 // signers 619 objArrayOop signers() const; 620 621 // host class 622 InstanceKlass* host_klass() const { 623 InstanceKlass** hk = adr_host_klass(); 624 if (hk == NULL) { 625 return NULL; 626 } else { 627 assert(*hk != NULL, "host klass should always be set if the address is not null"); 628 return *hk; 629 } 630 } 631 void set_host_klass(const InstanceKlass* host) { 632 assert(is_anonymous(), "not anonymous"); 633 const InstanceKlass** addr = (const InstanceKlass **)adr_host_klass(); 634 assert(addr != NULL, "no reversed space"); 635 if (addr != NULL) { 636 *addr = host; 637 } 638 } 639 bool is_anonymous() const { 640 return (_misc_flags & _misc_is_anonymous) != 0; 641 } 642 void set_is_anonymous(bool value) { 643 if (value) { 644 _misc_flags |= _misc_is_anonymous; 645 } else { 646 _misc_flags &= ~_misc_is_anonymous; 647 } 648 } 649 650 // Oop that keeps the metadata for this class from being unloaded 651 // in places where the metadata is stored in other places, like nmethods 652 oop klass_holder() const { 653 return is_anonymous() ? java_mirror() : class_loader(); 654 } 655 656 bool is_contended() const { 657 return (_misc_flags & _misc_is_contended) != 0; 658 } 659 void set_is_contended(bool value) { 660 if (value) { 661 _misc_flags |= _misc_is_contended; 662 } else { 663 _misc_flags &= ~_misc_is_contended; 664 } 665 } 666 667 // source file name 668 Symbol* source_file_name() const { 669 return (_source_file_name_index == 0) ? 670 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index); 671 } 672 u2 source_file_name_index() const { 673 return _source_file_name_index; 674 } 675 void set_source_file_name_index(u2 sourcefile_index) { 676 _source_file_name_index = sourcefile_index; 677 } 678 679 // minor and major version numbers of class file 680 u2 minor_version() const { return _minor_version; } 681 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 682 u2 major_version() const { return _major_version; } 683 void set_major_version(u2 major_version) { _major_version = major_version; } 684 685 // source debug extension 686 const char* source_debug_extension() const { return _source_debug_extension; } 687 void set_source_debug_extension(const char* array, int length); 688 689 // symbol unloading support (refcount already added) 690 Symbol* array_name() { return _array_name; } 691 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; } 692 693 // nonstatic oop-map blocks 694 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 695 return oop_map_count * OopMapBlock::size_in_words(); 696 } 697 unsigned int nonstatic_oop_map_count() const { 698 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 699 } 700 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 701 void set_nonstatic_oop_map_size(int words) { 702 _nonstatic_oop_map_size = words; 703 } 704 705 #if INCLUDE_JVMTI 706 // Redefinition locking. Class can only be redefined by one thread at a time. 707 bool is_being_redefined() const { return _is_being_redefined; } 708 void set_is_being_redefined(bool value) { _is_being_redefined = value; } 709 710 // RedefineClasses() support for previous versions: 711 void add_previous_version(instanceKlassHandle ikh, int emcp_method_count); 712 void purge_previous_version_list(); 713 714 InstanceKlass* previous_versions() const { return _previous_versions; } 715 #else 716 InstanceKlass* previous_versions() const { return NULL; } 717 #endif 718 719 InstanceKlass* get_klass_version(int version) { 720 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 721 if (ik->constants()->version() == version) { 722 return ik; 723 } 724 } 725 return NULL; 726 } 727 728 bool has_been_redefined() const { 729 return (_misc_flags & _misc_has_been_redefined) != 0; 730 } 731 void set_has_been_redefined() { 732 _misc_flags |= _misc_has_been_redefined; 733 } 734 735 bool is_scratch_class() const { 736 return (_misc_flags & _misc_is_scratch_class) != 0; 737 } 738 739 void set_is_scratch_class() { 740 _misc_flags |= _misc_is_scratch_class; 741 } 742 743 private: 744 745 void set_kind(unsigned kind) { 746 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind"); 747 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos; 748 unsigned flags = _misc_flags & ~fmask; 749 _misc_flags = (flags | (kind << _misc_kind_field_pos)); 750 } 751 752 bool is_kind(unsigned desired) const { 753 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask; 754 return kind == desired; 755 } 756 757 public: 758 759 // Other is anything that is not one of the more specialized kinds of InstanceKlass. 760 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); } 761 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); } 762 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); } 763 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); } 764 765 #if INCLUDE_JVMTI 766 767 void init_previous_versions() { 768 _previous_versions = NULL; 769 } 770 771 private: 772 static bool _has_previous_versions; 773 public: 774 static void purge_previous_versions(InstanceKlass* ik) { 775 if (ik->has_been_redefined()) { 776 ik->purge_previous_version_list(); 777 } 778 } 779 780 static bool has_previous_versions_and_reset(); 781 782 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 783 void set_cached_class_file(JvmtiCachedClassFileData *data) { 784 _cached_class_file = data; 785 } 786 JvmtiCachedClassFileData * get_cached_class_file(); 787 jint get_cached_class_file_len(); 788 unsigned char * get_cached_class_file_bytes(); 789 790 // JVMTI: Support for caching of field indices, types, and offsets 791 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 792 _jvmti_cached_class_field_map = descriptor; 793 } 794 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 795 return _jvmti_cached_class_field_map; 796 } 797 798 #if INCLUDE_CDS 799 void set_archived_class_data(JvmtiCachedClassFileData* data) { 800 _cached_class_file = data; 801 } 802 803 JvmtiCachedClassFileData * get_archived_class_data(); 804 #endif // INCLUDE_CDS 805 #else // INCLUDE_JVMTI 806 807 static void purge_previous_versions(InstanceKlass* ik) { return; }; 808 static bool has_previous_versions_and_reset() { return false; } 809 810 void set_cached_class_file(JvmtiCachedClassFileData *data) { 811 assert(data == NULL, "unexpected call with JVMTI disabled"); 812 } 813 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; } 814 815 #endif // INCLUDE_JVMTI 816 817 bool has_nonstatic_concrete_methods() const { 818 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0; 819 } 820 void set_has_nonstatic_concrete_methods(bool b) { 821 if (b) { 822 _misc_flags |= _misc_has_nonstatic_concrete_methods; 823 } else { 824 _misc_flags &= ~_misc_has_nonstatic_concrete_methods; 825 } 826 } 827 828 bool declares_nonstatic_concrete_methods() const { 829 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0; 830 } 831 void set_declares_nonstatic_concrete_methods(bool b) { 832 if (b) { 833 _misc_flags |= _misc_declares_nonstatic_concrete_methods; 834 } else { 835 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods; 836 } 837 } 838 839 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 840 inline u2 next_method_idnum(); 841 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 842 843 // generics support 844 Symbol* generic_signature() const { 845 return (_generic_signature_index == 0) ? 846 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index); 847 } 848 u2 generic_signature_index() const { 849 return _generic_signature_index; 850 } 851 void set_generic_signature_index(u2 sig_index) { 852 _generic_signature_index = sig_index; 853 } 854 855 u2 enclosing_method_data(int offset) const; 856 u2 enclosing_method_class_index() const { 857 return enclosing_method_data(enclosing_method_class_index_offset); 858 } 859 u2 enclosing_method_method_index() { 860 return enclosing_method_data(enclosing_method_method_index_offset); 861 } 862 void set_enclosing_method_indices(u2 class_index, 863 u2 method_index); 864 865 // jmethodID support 866 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, 867 const methodHandle& method_h); 868 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h, 869 size_t idnum, jmethodID new_id, jmethodID* new_jmeths, 870 jmethodID* to_dealloc_id_p, 871 jmethodID** to_dealloc_jmeths_p); 872 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 873 size_t *length_p, jmethodID* id_p); 874 void ensure_space_for_methodids(int start_offset = 0); 875 jmethodID jmethod_id_or_null(Method* method); 876 877 // annotations support 878 Annotations* annotations() const { return _annotations; } 879 void set_annotations(Annotations* anno) { _annotations = anno; } 880 881 AnnotationArray* class_annotations() const { 882 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 883 } 884 Array<AnnotationArray*>* fields_annotations() const { 885 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 886 } 887 AnnotationArray* class_type_annotations() const { 888 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 889 } 890 Array<AnnotationArray*>* fields_type_annotations() const { 891 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 892 } 893 // allocation 894 instanceOop allocate_instance(TRAPS); 895 896 // additional member function to return a handle 897 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } 898 899 objArrayOop allocate_objArray(int n, int length, TRAPS); 900 // Helper function 901 static instanceOop register_finalizer(instanceOop i, TRAPS); 902 903 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 904 // if not, throw either an Error or an Exception. 905 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 906 907 // initialization 908 void call_class_initializer(TRAPS); 909 void set_initialization_state_and_notify(ClassState state, TRAPS); 910 911 // OopMapCache support 912 OopMapCache* oop_map_cache() { return _oop_map_cache; } 913 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 914 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 915 916 // JNI identifier support (for static fields - for jni performance) 917 JNIid* jni_ids() { return _jni_ids; } 918 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 919 JNIid* jni_id_for(int offset); 920 921 // maintenance of deoptimization dependencies 922 inline DependencyContext dependencies(); 923 int mark_dependent_nmethods(KlassDepChange& changes); 924 void add_dependent_nmethod(nmethod* nm); 925 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately); 926 927 // On-stack replacement support 928 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 929 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 930 void add_osr_nmethod(nmethod* n); 931 bool remove_osr_nmethod(nmethod* n); 932 int mark_osr_nmethods(const Method* m); 933 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 934 935 #if INCLUDE_JVMTI 936 // Breakpoint support (see methods on Method* for details) 937 BreakpointInfo* breakpoints() const { return _breakpoints; }; 938 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 939 #endif 940 941 // support for stub routines 942 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 943 TRACE_DEFINE_KLASS_TRACE_ID_OFFSET; 944 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 945 946 // subclass/subinterface checks 947 bool implements_interface(Klass* k) const; 948 bool is_same_or_direct_interface(Klass* k) const; 949 950 #ifdef ASSERT 951 // check whether this class or one of its superclasses was redefined 952 bool has_redefined_this_or_super() const; 953 #endif 954 955 // Access to the implementor of an interface. 956 Klass* implementor() const 957 { 958 Klass** k = adr_implementor(); 959 if (k == NULL) { 960 return NULL; 961 } else { 962 return *k; 963 } 964 } 965 966 void set_implementor(Klass* k) { 967 assert(is_interface(), "not interface"); 968 Klass** addr = adr_implementor(); 969 assert(addr != NULL, "null addr"); 970 if (addr != NULL) { 971 *addr = k; 972 } 973 } 974 975 int nof_implementors() const { 976 Klass* k = implementor(); 977 if (k == NULL) { 978 return 0; 979 } else if (k != this) { 980 return 1; 981 } else { 982 return 2; 983 } 984 } 985 986 void add_implementor(Klass* k); // k is a new class that implements this interface 987 void init_implementor(); // initialize 988 989 // link this class into the implementors list of every interface it implements 990 void process_interfaces(Thread *thread); 991 992 // virtual operations from Klass 993 bool is_leaf_class() const { return _subklass == NULL; } 994 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); 995 bool compute_is_subtype_of(Klass* k); 996 bool can_be_primary_super_slow() const; 997 int oop_size(oop obj) const { return size_helper(); } 998 // slow because it's a virtual call and used for verifying the layout_helper. 999 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 1000 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 1001 1002 // Iterators 1003 void do_local_static_fields(FieldClosure* cl); 1004 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 1005 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 1006 1007 void methods_do(void f(Method* method)); 1008 void array_klasses_do(void f(Klass* k)); 1009 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 1010 bool super_types_do(SuperTypeClosure* blk); 1011 1012 static InstanceKlass* cast(Klass* k) { 1013 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 1014 } 1015 1016 static const InstanceKlass* cast(const Klass* k) { 1017 assert(k != NULL, "k should not be null"); 1018 assert(k->is_instance_klass(), "cast to InstanceKlass"); 1019 return static_cast<const InstanceKlass*>(k); 1020 } 1021 1022 InstanceKlass* java_super() const { 1023 return (super() == NULL) ? NULL : cast(super()); 1024 } 1025 1026 // Sizing (in words) 1027 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 1028 1029 static int size(int vtable_length, int itable_length, 1030 int nonstatic_oop_map_size, 1031 bool is_interface, bool is_anonymous) { 1032 return align_metadata_size(header_size() + 1033 vtable_length + 1034 itable_length + 1035 nonstatic_oop_map_size + 1036 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) + 1037 (is_anonymous ? (int)sizeof(Klass*)/wordSize : 0)); 1038 } 1039 int size() const { return size(vtable_length(), 1040 itable_length(), 1041 nonstatic_oop_map_size(), 1042 is_interface(), 1043 is_anonymous()); 1044 } 1045 #if INCLUDE_SERVICES 1046 virtual void collect_statistics(KlassSizeStats *sz) const; 1047 #endif 1048 1049 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); } 1050 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 1051 1052 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 1053 1054 address static_field_addr(int offset); 1055 1056 OopMapBlock* start_of_nonstatic_oop_maps() const { 1057 return (OopMapBlock*)(start_of_itable() + itable_length()); 1058 } 1059 1060 Klass** end_of_nonstatic_oop_maps() const { 1061 return (Klass**)(start_of_nonstatic_oop_maps() + 1062 nonstatic_oop_map_count()); 1063 } 1064 1065 Klass** adr_implementor() const { 1066 if (is_interface()) { 1067 return (Klass**)end_of_nonstatic_oop_maps(); 1068 } else { 1069 return NULL; 1070 } 1071 }; 1072 1073 InstanceKlass** adr_host_klass() const { 1074 if (is_anonymous()) { 1075 InstanceKlass** adr_impl = (InstanceKlass **)adr_implementor(); 1076 if (adr_impl != NULL) { 1077 return adr_impl + 1; 1078 } else { 1079 return (InstanceKlass **)end_of_nonstatic_oop_maps(); 1080 } 1081 } else { 1082 return NULL; 1083 } 1084 } 1085 1086 // Use this to return the size of an instance in heap words: 1087 int size_helper() const { 1088 return layout_helper_to_size_helper(layout_helper()); 1089 } 1090 1091 // This bit is initialized in classFileParser.cpp. 1092 // It is false under any of the following conditions: 1093 // - the class is abstract (including any interface) 1094 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1095 // - the class size is larger than FastAllocateSizeLimit 1096 // - the class is java/lang/Class, which cannot be allocated directly 1097 bool can_be_fastpath_allocated() const { 1098 return !layout_helper_needs_slow_path(layout_helper()); 1099 } 1100 1101 // Java itable 1102 klassItable* itable() const; // return new klassItable wrapper 1103 Method* method_at_itable(Klass* holder, int index, TRAPS); 1104 1105 #if INCLUDE_JVMTI 1106 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed); 1107 #endif // INCLUDE_JVMTI 1108 1109 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive); 1110 void clean_implementors_list(BoolObjectClosure* is_alive); 1111 void clean_method_data(BoolObjectClosure* is_alive); 1112 1113 // Explicit metaspace deallocation of fields 1114 // For RedefineClasses and class file parsing errors, we need to deallocate 1115 // instanceKlasses and the metadata they point to. 1116 void deallocate_contents(ClassLoaderData* loader_data); 1117 static void deallocate_methods(ClassLoaderData* loader_data, 1118 Array<Method*>* methods); 1119 void static deallocate_interfaces(ClassLoaderData* loader_data, 1120 const Klass* super_klass, 1121 Array<Klass*>* local_interfaces, 1122 Array<Klass*>* transitive_interfaces); 1123 1124 // The constant pool is on stack if any of the methods are executing or 1125 // referenced by handles. 1126 bool on_stack() const { return _constants->on_stack(); } 1127 1128 // callbacks for actions during class unloading 1129 static void notify_unload_class(InstanceKlass* ik); 1130 static void release_C_heap_structures(InstanceKlass* ik); 1131 1132 // Naming 1133 const char* signature_name() const; 1134 static Symbol* package_from_name(const Symbol* name, TRAPS); 1135 1136 // GC specific object visitors 1137 // 1138 // Mark Sweep 1139 int oop_ms_adjust_pointers(oop obj); 1140 #if INCLUDE_ALL_GCS 1141 // Parallel Scavenge 1142 void oop_ps_push_contents( oop obj, PSPromotionManager* pm); 1143 // Parallel Compact 1144 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm); 1145 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm); 1146 #endif 1147 1148 // Oop fields (and metadata) iterators 1149 // [nv = true] Use non-virtual calls to do_oop_nv. 1150 // [nv = false] Use virtual calls to do_oop. 1151 // 1152 // The InstanceKlass iterators also visits the Object's klass. 1153 1154 // Forward iteration 1155 public: 1156 // Iterate over all oop fields in the oop maps. 1157 template <bool nv, class OopClosureType> 1158 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1159 1160 protected: 1161 // Iterate over all oop fields and metadata. 1162 template <bool nv, class OopClosureType> 1163 inline int oop_oop_iterate(oop obj, OopClosureType* closure); 1164 1165 private: 1166 // Iterate over all oop fields in the oop maps. 1167 // Specialized for [T = oop] or [T = narrowOop]. 1168 template <bool nv, typename T, class OopClosureType> 1169 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure); 1170 1171 // Iterate over all oop fields in one oop map. 1172 template <bool nv, typename T, class OopClosureType> 1173 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1174 1175 1176 // Reverse iteration 1177 #if INCLUDE_ALL_GCS 1178 public: 1179 // Iterate over all oop fields in the oop maps. 1180 template <bool nv, class OopClosureType> 1181 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1182 1183 protected: 1184 // Iterate over all oop fields and metadata. 1185 template <bool nv, class OopClosureType> 1186 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1187 1188 private: 1189 // Iterate over all oop fields in the oop maps. 1190 // Specialized for [T = oop] or [T = narrowOop]. 1191 template <bool nv, typename T, class OopClosureType> 1192 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure); 1193 1194 // Iterate over all oop fields in one oop map. 1195 template <bool nv, typename T, class OopClosureType> 1196 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1197 #endif 1198 1199 1200 // Bounded range iteration 1201 public: 1202 // Iterate over all oop fields in the oop maps. 1203 template <bool nv, class OopClosureType> 1204 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1205 1206 protected: 1207 // Iterate over all oop fields and metadata. 1208 template <bool nv, class OopClosureType> 1209 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1210 1211 private: 1212 // Iterate over all oop fields in the oop maps. 1213 // Specialized for [T = oop] or [T = narrowOop]. 1214 template <bool nv, typename T, class OopClosureType> 1215 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1216 1217 // Iterate over all oop fields in one oop map. 1218 template <bool nv, typename T, class OopClosureType> 1219 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1220 1221 1222 public: 1223 1224 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL) 1225 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL) 1226 1227 #if INCLUDE_ALL_GCS 1228 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS) 1229 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS) 1230 #endif // INCLUDE_ALL_GCS 1231 1232 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1233 1234 public: 1235 void set_in_error_state() { 1236 assert(DumpSharedSpaces, "only call this when dumping archive"); 1237 _init_state = initialization_error; 1238 } 1239 bool check_sharing_error_state(); 1240 1241 private: 1242 // initialization state 1243 #ifdef ASSERT 1244 void set_init_state(ClassState state); 1245 #else 1246 void set_init_state(ClassState state) { _init_state = (u1)state; } 1247 #endif 1248 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1249 void set_init_thread(Thread *thread) { _init_thread = thread; } 1250 1251 // The RedefineClasses() API can cause new method idnums to be needed 1252 // which will cause the caches to grow. Safety requires different 1253 // cache management logic if the caches can grow instead of just 1254 // going from NULL to non-NULL. 1255 bool idnum_can_increment() const { return has_been_redefined(); } 1256 inline jmethodID* methods_jmethod_ids_acquire() const; 1257 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1258 1259 // Lock during initialization 1260 public: 1261 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1262 // Must be one per class and it has to be a VM internal object so java code 1263 // cannot lock it (like the mirror). 1264 // It has to be an object not a Mutex because it's held through java calls. 1265 oop init_lock() const; 1266 private: 1267 void fence_and_clear_init_lock(); 1268 1269 // Static methods that are used to implement member methods where an exposed this pointer 1270 // is needed due to possible GCs 1271 static bool link_class_impl (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS); 1272 static bool verify_code (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS); 1273 static void initialize_impl (instanceKlassHandle this_k, TRAPS); 1274 static void initialize_super_interfaces (instanceKlassHandle this_k, TRAPS); 1275 static void eager_initialize_impl (instanceKlassHandle this_k); 1276 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_k, ClassState state, TRAPS); 1277 static void call_class_initializer_impl (instanceKlassHandle this_k, TRAPS); 1278 static Klass* array_klass_impl (instanceKlassHandle this_k, bool or_null, int n, TRAPS); 1279 static void do_local_static_fields_impl (instanceKlassHandle this_k, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS); 1280 /* jni_id_for_impl for jfieldID only */ 1281 static JNIid* jni_id_for_impl (instanceKlassHandle this_k, int offset); 1282 1283 // Returns the array class for the n'th dimension 1284 Klass* array_klass_impl(bool or_null, int n, TRAPS); 1285 1286 // Returns the array class with this class as element type 1287 Klass* array_klass_impl(bool or_null, TRAPS); 1288 1289 // find a local method (returns NULL if not found) 1290 Method* find_method_impl(const Symbol* name, 1291 const Symbol* signature, 1292 OverpassLookupMode overpass_mode, 1293 StaticLookupMode static_mode, 1294 PrivateLookupMode private_mode) const; 1295 1296 static Method* find_method_impl(const Array<Method*>* methods, 1297 const Symbol* name, 1298 const Symbol* signature, 1299 OverpassLookupMode overpass_mode, 1300 StaticLookupMode static_mode, 1301 PrivateLookupMode private_mode); 1302 1303 // Free CHeap allocated fields. 1304 void release_C_heap_structures(); 1305 1306 #if INCLUDE_JVMTI 1307 // RedefineClasses support 1308 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1309 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1310 #endif 1311 public: 1312 // CDS support - remove and restore oops from metadata. Oops are not shared. 1313 virtual void remove_unshareable_info(); 1314 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 1315 1316 // jvm support 1317 jint compute_modifier_flags(TRAPS) const; 1318 1319 // JSR-292 support 1320 MemberNameTable* member_names() { return _member_names; } 1321 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; } 1322 bool add_member_name(Handle member_name); 1323 1324 public: 1325 // JVMTI support 1326 jint jvmti_class_status() const; 1327 1328 public: 1329 // Printing 1330 #ifndef PRODUCT 1331 void print_on(outputStream* st) const; 1332 #endif 1333 void print_value_on(outputStream* st) const; 1334 1335 void oop_print_value_on(oop obj, outputStream* st); 1336 1337 #ifndef PRODUCT 1338 void oop_print_on (oop obj, outputStream* st); 1339 1340 void print_dependent_nmethods(bool verbose = false); 1341 bool is_dependent_nmethod(nmethod* nm); 1342 #endif 1343 1344 const char* internal_name() const; 1345 1346 // Verification 1347 void verify_on(outputStream* st); 1348 1349 void oop_verify_on(oop obj, outputStream* st); 1350 1351 // Logging 1352 void print_loading_log(LogLevel::type type, ClassLoaderData* loader_data, 1353 const char* module_name, const ClassFileStream* cfs) const; 1354 }; 1355 1356 // for adding methods 1357 // UNSET_IDNUM return means no more ids available 1358 inline u2 InstanceKlass::next_method_idnum() { 1359 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1360 return ConstMethod::UNSET_IDNUM; // no more ids available 1361 } else { 1362 return _idnum_allocated_count++; 1363 } 1364 } 1365 1366 1367 /* JNIid class for jfieldIDs only */ 1368 class JNIid: public CHeapObj<mtClass> { 1369 friend class VMStructs; 1370 private: 1371 Klass* _holder; 1372 JNIid* _next; 1373 int _offset; 1374 #ifdef ASSERT 1375 bool _is_static_field_id; 1376 #endif 1377 1378 public: 1379 // Accessors 1380 Klass* holder() const { return _holder; } 1381 int offset() const { return _offset; } 1382 JNIid* next() { return _next; } 1383 // Constructor 1384 JNIid(Klass* holder, int offset, JNIid* next); 1385 // Identifier lookup 1386 JNIid* find(int offset); 1387 1388 bool find_local_field(fieldDescriptor* fd) { 1389 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1390 } 1391 1392 static void deallocate(JNIid* id); 1393 // Debugging 1394 #ifdef ASSERT 1395 bool is_static_field_id() const { return _is_static_field_id; } 1396 void set_is_static_field_id() { _is_static_field_id = true; } 1397 #endif 1398 void verify(Klass* holder); 1399 }; 1400 1401 // An iterator that's used to access the inner classes indices in the 1402 // InstanceKlass::_inner_classes array. 1403 class InnerClassesIterator : public StackObj { 1404 private: 1405 Array<jushort>* _inner_classes; 1406 int _length; 1407 int _idx; 1408 public: 1409 1410 InnerClassesIterator(instanceKlassHandle k) { 1411 _inner_classes = k->inner_classes(); 1412 if (k->inner_classes() != NULL) { 1413 _length = _inner_classes->length(); 1414 // The inner class array's length should be the multiple of 1415 // inner_class_next_offset if it only contains the InnerClasses 1416 // attribute data, or it should be 1417 // n*inner_class_next_offset+enclosing_method_attribute_size 1418 // if it also contains the EnclosingMethod data. 1419 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1420 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1421 "just checking"); 1422 // Remove the enclosing_method portion if exists. 1423 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1424 _length -= InstanceKlass::enclosing_method_attribute_size; 1425 } 1426 } else { 1427 _length = 0; 1428 } 1429 _idx = 0; 1430 } 1431 1432 int length() const { 1433 return _length; 1434 } 1435 1436 void next() { 1437 _idx += InstanceKlass::inner_class_next_offset; 1438 } 1439 1440 bool done() const { 1441 return (_idx >= _length); 1442 } 1443 1444 u2 inner_class_info_index() const { 1445 return _inner_classes->at( 1446 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1447 } 1448 1449 void set_inner_class_info_index(u2 index) { 1450 _inner_classes->at_put( 1451 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1452 } 1453 1454 u2 outer_class_info_index() const { 1455 return _inner_classes->at( 1456 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1457 } 1458 1459 void set_outer_class_info_index(u2 index) { 1460 _inner_classes->at_put( 1461 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1462 } 1463 1464 u2 inner_name_index() const { 1465 return _inner_classes->at( 1466 _idx + InstanceKlass::inner_class_inner_name_offset); 1467 } 1468 1469 void set_inner_name_index(u2 index) { 1470 _inner_classes->at_put( 1471 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1472 } 1473 1474 u2 inner_access_flags() const { 1475 return _inner_classes->at( 1476 _idx + InstanceKlass::inner_class_access_flags_offset); 1477 } 1478 }; 1479 1480 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP