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_default_methods = 1 << 7, // class/superclass/implemented interfaces has default methods 216 _misc_declares_default_methods = 1 << 8, // directly declares default methods (any access) 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 Klass* host_klass() const { 623 Klass** hk = (Klass**)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 Klass* host) { 632 assert(is_anonymous(), "not anonymous"); 633 const Klass** addr = (const Klass**)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); 712 713 InstanceKlass* previous_versions() const { return _previous_versions; } 714 #else 715 InstanceKlass* previous_versions() const { return NULL; } 716 #endif 717 718 InstanceKlass* get_klass_version(int version) { 719 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 720 if (ik->constants()->version() == version) { 721 return ik; 722 } 723 } 724 return NULL; 725 } 726 727 bool has_been_redefined() const { 728 return (_misc_flags & _misc_has_been_redefined) != 0; 729 } 730 void set_has_been_redefined() { 731 _misc_flags |= _misc_has_been_redefined; 732 } 733 734 bool is_scratch_class() const { 735 return (_misc_flags & _misc_is_scratch_class) != 0; 736 } 737 738 void set_is_scratch_class() { 739 _misc_flags |= _misc_is_scratch_class; 740 } 741 742 private: 743 744 void set_kind(unsigned kind) { 745 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind"); 746 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos; 747 unsigned flags = _misc_flags & ~fmask; 748 _misc_flags = (flags | (kind << _misc_kind_field_pos)); 749 } 750 751 bool is_kind(unsigned desired) const { 752 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask; 753 return kind == desired; 754 } 755 756 public: 757 758 // Other is anything that is not one of the more specialized kinds of InstanceKlass. 759 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); } 760 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); } 761 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); } 762 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); } 763 764 #if INCLUDE_JVMTI 765 766 void init_previous_versions() { 767 _previous_versions = NULL; 768 } 769 770 private: 771 static int _previous_version_count; 772 public: 773 static void purge_previous_versions(InstanceKlass* ik); 774 static bool has_previous_versions() { 775 assert(_previous_version_count >= 0, "count should never be negative"); 776 return _previous_version_count > 0; 777 } 778 779 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 780 void set_cached_class_file(JvmtiCachedClassFileData *data) { 781 _cached_class_file = data; 782 } 783 JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; } 784 jint get_cached_class_file_len(); 785 unsigned char * get_cached_class_file_bytes(); 786 787 // JVMTI: Support for caching of field indices, types, and offsets 788 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 789 _jvmti_cached_class_field_map = descriptor; 790 } 791 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 792 return _jvmti_cached_class_field_map; 793 } 794 795 #else // INCLUDE_JVMTI 796 797 static void purge_previous_versions(InstanceKlass* ik) { return; }; 798 static bool has_previous_versions() { return false; } 799 800 void set_cached_class_file(JvmtiCachedClassFileData *data) { 801 assert(data == NULL, "unexpected call with JVMTI disabled"); 802 } 803 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; } 804 805 #endif // INCLUDE_JVMTI 806 807 bool has_default_methods() const { 808 return (_misc_flags & _misc_has_default_methods) != 0; 809 } 810 void set_has_default_methods(bool b) { 811 if (b) { 812 _misc_flags |= _misc_has_default_methods; 813 } else { 814 _misc_flags &= ~_misc_has_default_methods; 815 } 816 } 817 818 bool declares_default_methods() const { 819 return (_misc_flags & _misc_declares_default_methods) != 0; 820 } 821 void set_declares_default_methods(bool b) { 822 if (b) { 823 _misc_flags |= _misc_declares_default_methods; 824 } else { 825 _misc_flags &= ~_misc_declares_default_methods; 826 } 827 } 828 829 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 830 inline u2 next_method_idnum(); 831 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 832 833 // generics support 834 Symbol* generic_signature() const { 835 return (_generic_signature_index == 0) ? 836 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index); 837 } 838 u2 generic_signature_index() const { 839 return _generic_signature_index; 840 } 841 void set_generic_signature_index(u2 sig_index) { 842 _generic_signature_index = sig_index; 843 } 844 845 u2 enclosing_method_data(int offset) const; 846 u2 enclosing_method_class_index() const { 847 return enclosing_method_data(enclosing_method_class_index_offset); 848 } 849 u2 enclosing_method_method_index() { 850 return enclosing_method_data(enclosing_method_method_index_offset); 851 } 852 void set_enclosing_method_indices(u2 class_index, 853 u2 method_index); 854 855 // jmethodID support 856 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, 857 const methodHandle& method_h); 858 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h, 859 size_t idnum, jmethodID new_id, jmethodID* new_jmeths, 860 jmethodID* to_dealloc_id_p, 861 jmethodID** to_dealloc_jmeths_p); 862 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 863 size_t *length_p, jmethodID* id_p); 864 void ensure_space_for_methodids(int start_offset = 0); 865 jmethodID jmethod_id_or_null(Method* method); 866 867 // annotations support 868 Annotations* annotations() const { return _annotations; } 869 void set_annotations(Annotations* anno) { _annotations = anno; } 870 871 AnnotationArray* class_annotations() const { 872 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 873 } 874 Array<AnnotationArray*>* fields_annotations() const { 875 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 876 } 877 AnnotationArray* class_type_annotations() const { 878 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 879 } 880 Array<AnnotationArray*>* fields_type_annotations() const { 881 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 882 } 883 // allocation 884 instanceOop allocate_instance(TRAPS); 885 886 // additional member function to return a handle 887 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } 888 889 objArrayOop allocate_objArray(int n, int length, TRAPS); 890 // Helper function 891 static instanceOop register_finalizer(instanceOop i, TRAPS); 892 893 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 894 // if not, throw either an Error or an Exception. 895 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 896 897 // initialization 898 void call_class_initializer(TRAPS); 899 void set_initialization_state_and_notify(ClassState state, TRAPS); 900 901 // OopMapCache support 902 OopMapCache* oop_map_cache() { return _oop_map_cache; } 903 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 904 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 905 906 // JNI identifier support (for static fields - for jni performance) 907 JNIid* jni_ids() { return _jni_ids; } 908 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 909 JNIid* jni_id_for(int offset); 910 911 // maintenance of deoptimization dependencies 912 inline DependencyContext dependencies(); 913 int mark_dependent_nmethods(KlassDepChange& changes); 914 void add_dependent_nmethod(nmethod* nm); 915 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately); 916 917 // On-stack replacement support 918 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 919 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 920 void add_osr_nmethod(nmethod* n); 921 bool remove_osr_nmethod(nmethod* n); 922 int mark_osr_nmethods(const Method* m); 923 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 924 925 #if INCLUDE_JVMTI 926 // Breakpoint support (see methods on Method* for details) 927 BreakpointInfo* breakpoints() const { return _breakpoints; }; 928 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 929 #endif 930 931 // support for stub routines 932 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 933 TRACE_DEFINE_KLASS_TRACE_ID_OFFSET; 934 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 935 936 // subclass/subinterface checks 937 bool implements_interface(Klass* k) const; 938 bool is_same_or_direct_interface(Klass* k) const; 939 940 #ifdef ASSERT 941 // check whether this class or one of its superclasses was redefined 942 bool has_redefined_this_or_super() const; 943 #endif 944 945 // Access to the implementor of an interface. 946 Klass* implementor() const 947 { 948 Klass** k = adr_implementor(); 949 if (k == NULL) { 950 return NULL; 951 } else { 952 return *k; 953 } 954 } 955 956 void set_implementor(Klass* k) { 957 assert(is_interface(), "not interface"); 958 Klass** addr = adr_implementor(); 959 assert(addr != NULL, "null addr"); 960 if (addr != NULL) { 961 *addr = k; 962 } 963 } 964 965 int nof_implementors() const { 966 Klass* k = implementor(); 967 if (k == NULL) { 968 return 0; 969 } else if (k != this) { 970 return 1; 971 } else { 972 return 2; 973 } 974 } 975 976 void add_implementor(Klass* k); // k is a new class that implements this interface 977 void init_implementor(); // initialize 978 979 // link this class into the implementors list of every interface it implements 980 void process_interfaces(Thread *thread); 981 982 // virtual operations from Klass 983 bool is_leaf_class() const { return _subklass == NULL; } 984 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); 985 bool compute_is_subtype_of(Klass* k); 986 bool can_be_primary_super_slow() const; 987 int oop_size(oop obj) const { return size_helper(); } 988 // slow because it's a virtual call and used for verifying the layout_helper. 989 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 990 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 991 992 // Iterators 993 void do_local_static_fields(FieldClosure* cl); 994 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 995 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 996 997 void methods_do(void f(Method* method)); 998 void array_klasses_do(void f(Klass* k)); 999 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 1000 bool super_types_do(SuperTypeClosure* blk); 1001 1002 static InstanceKlass* cast(Klass* k) { 1003 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 1004 } 1005 1006 static const InstanceKlass* cast(const Klass* k) { 1007 assert(k != NULL, "k should not be null"); 1008 assert(k->is_instance_klass(), "cast to InstanceKlass"); 1009 return static_cast<const InstanceKlass*>(k); 1010 } 1011 1012 InstanceKlass* java_super() const { 1013 return (super() == NULL) ? NULL : cast(super()); 1014 } 1015 1016 // Sizing (in words) 1017 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 1018 1019 static int size(int vtable_length, int itable_length, 1020 int nonstatic_oop_map_size, 1021 bool is_interface, bool is_anonymous) { 1022 return align_metadata_size(header_size() + 1023 vtable_length + 1024 itable_length + 1025 nonstatic_oop_map_size + 1026 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) + 1027 (is_anonymous ? (int)sizeof(Klass*)/wordSize : 0)); 1028 } 1029 int size() const { return size(vtable_length(), 1030 itable_length(), 1031 nonstatic_oop_map_size(), 1032 is_interface(), 1033 is_anonymous()); 1034 } 1035 #if INCLUDE_SERVICES 1036 virtual void collect_statistics(KlassSizeStats *sz) const; 1037 #endif 1038 1039 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); } 1040 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 1041 1042 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 1043 1044 address static_field_addr(int offset); 1045 1046 OopMapBlock* start_of_nonstatic_oop_maps() const { 1047 return (OopMapBlock*)(start_of_itable() + itable_length()); 1048 } 1049 1050 Klass** end_of_nonstatic_oop_maps() const { 1051 return (Klass**)(start_of_nonstatic_oop_maps() + 1052 nonstatic_oop_map_count()); 1053 } 1054 1055 Klass** adr_implementor() const { 1056 if (is_interface()) { 1057 return (Klass**)end_of_nonstatic_oop_maps(); 1058 } else { 1059 return NULL; 1060 } 1061 }; 1062 1063 Klass** adr_host_klass() const { 1064 if (is_anonymous()) { 1065 Klass** adr_impl = adr_implementor(); 1066 if (adr_impl != NULL) { 1067 return adr_impl + 1; 1068 } else { 1069 return end_of_nonstatic_oop_maps(); 1070 } 1071 } else { 1072 return NULL; 1073 } 1074 } 1075 1076 // Use this to return the size of an instance in heap words: 1077 int size_helper() const { 1078 return layout_helper_to_size_helper(layout_helper()); 1079 } 1080 1081 // This bit is initialized in classFileParser.cpp. 1082 // It is false under any of the following conditions: 1083 // - the class is abstract (including any interface) 1084 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1085 // - the class size is larger than FastAllocateSizeLimit 1086 // - the class is java/lang/Class, which cannot be allocated directly 1087 bool can_be_fastpath_allocated() const { 1088 return !layout_helper_needs_slow_path(layout_helper()); 1089 } 1090 1091 // Java itable 1092 klassItable* itable() const; // return new klassItable wrapper 1093 Method* method_at_itable(Klass* holder, int index, TRAPS); 1094 1095 #if INCLUDE_JVMTI 1096 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed); 1097 #endif // INCLUDE_JVMTI 1098 1099 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive); 1100 void clean_implementors_list(BoolObjectClosure* is_alive); 1101 void clean_method_data(BoolObjectClosure* is_alive); 1102 1103 // Explicit metaspace deallocation of fields 1104 // For RedefineClasses and class file parsing errors, we need to deallocate 1105 // instanceKlasses and the metadata they point to. 1106 void deallocate_contents(ClassLoaderData* loader_data); 1107 static void deallocate_methods(ClassLoaderData* loader_data, 1108 Array<Method*>* methods); 1109 void static deallocate_interfaces(ClassLoaderData* loader_data, 1110 const Klass* super_klass, 1111 Array<Klass*>* local_interfaces, 1112 Array<Klass*>* transitive_interfaces); 1113 1114 // The constant pool is on stack if any of the methods are executing or 1115 // referenced by handles. 1116 bool on_stack() const { return _constants->on_stack(); } 1117 1118 // callbacks for actions during class unloading 1119 static void notify_unload_class(InstanceKlass* ik); 1120 static void release_C_heap_structures(InstanceKlass* ik); 1121 1122 // Naming 1123 const char* signature_name() const; 1124 static Symbol* package_from_name(const Symbol* name, TRAPS); 1125 1126 // GC specific object visitors 1127 // 1128 // Mark Sweep 1129 int oop_ms_adjust_pointers(oop obj); 1130 #if INCLUDE_ALL_GCS 1131 // Parallel Scavenge 1132 void oop_ps_push_contents( oop obj, PSPromotionManager* pm); 1133 // Parallel Compact 1134 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm); 1135 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm); 1136 #endif 1137 1138 // Oop fields (and metadata) iterators 1139 // [nv = true] Use non-virtual calls to do_oop_nv. 1140 // [nv = false] Use virtual calls to do_oop. 1141 // 1142 // The InstanceKlass iterators also visits the Object's klass. 1143 1144 // Forward iteration 1145 public: 1146 // Iterate over all oop fields in the oop maps. 1147 template <bool nv, class OopClosureType> 1148 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1149 1150 protected: 1151 // Iterate over all oop fields and metadata. 1152 template <bool nv, class OopClosureType> 1153 inline int oop_oop_iterate(oop obj, OopClosureType* closure); 1154 1155 private: 1156 // Iterate over all oop fields in the oop maps. 1157 // Specialized for [T = oop] or [T = narrowOop]. 1158 template <bool nv, typename T, class OopClosureType> 1159 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure); 1160 1161 // Iterate over all oop fields in one oop map. 1162 template <bool nv, typename T, class OopClosureType> 1163 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1164 1165 1166 // Reverse iteration 1167 #if INCLUDE_ALL_GCS 1168 public: 1169 // Iterate over all oop fields in the oop maps. 1170 template <bool nv, class OopClosureType> 1171 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1172 1173 protected: 1174 // Iterate over all oop fields and metadata. 1175 template <bool nv, class OopClosureType> 1176 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1177 1178 private: 1179 // Iterate over all oop fields in the oop maps. 1180 // Specialized for [T = oop] or [T = narrowOop]. 1181 template <bool nv, typename T, class OopClosureType> 1182 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure); 1183 1184 // Iterate over all oop fields in one oop map. 1185 template <bool nv, typename T, class OopClosureType> 1186 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1187 #endif 1188 1189 1190 // Bounded range iteration 1191 public: 1192 // Iterate over all oop fields in the oop maps. 1193 template <bool nv, class OopClosureType> 1194 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1195 1196 protected: 1197 // Iterate over all oop fields and metadata. 1198 template <bool nv, class OopClosureType> 1199 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1200 1201 private: 1202 // Iterate over all oop fields in the oop maps. 1203 // Specialized for [T = oop] or [T = narrowOop]. 1204 template <bool nv, typename T, class OopClosureType> 1205 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1206 1207 // Iterate over all oop fields in one oop map. 1208 template <bool nv, typename T, class OopClosureType> 1209 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1210 1211 1212 public: 1213 1214 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL) 1215 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL) 1216 1217 #if INCLUDE_ALL_GCS 1218 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS) 1219 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS) 1220 #endif // INCLUDE_ALL_GCS 1221 1222 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1223 1224 public: 1225 void set_in_error_state() { 1226 assert(DumpSharedSpaces, "only call this when dumping archive"); 1227 _init_state = initialization_error; 1228 } 1229 bool check_sharing_error_state(); 1230 1231 private: 1232 // initialization state 1233 #ifdef ASSERT 1234 void set_init_state(ClassState state); 1235 #else 1236 void set_init_state(ClassState state) { _init_state = (u1)state; } 1237 #endif 1238 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1239 void set_init_thread(Thread *thread) { _init_thread = thread; } 1240 1241 // The RedefineClasses() API can cause new method idnums to be needed 1242 // which will cause the caches to grow. Safety requires different 1243 // cache management logic if the caches can grow instead of just 1244 // going from NULL to non-NULL. 1245 bool idnum_can_increment() const { return has_been_redefined(); } 1246 inline jmethodID* methods_jmethod_ids_acquire() const; 1247 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1248 1249 // Lock during initialization 1250 public: 1251 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1252 // Must be one per class and it has to be a VM internal object so java code 1253 // cannot lock it (like the mirror). 1254 // It has to be an object not a Mutex because it's held through java calls. 1255 oop init_lock() const; 1256 private: 1257 void fence_and_clear_init_lock(); 1258 1259 // Static methods that are used to implement member methods where an exposed this pointer 1260 // is needed due to possible GCs 1261 static bool link_class_impl (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS); 1262 static bool verify_code (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS); 1263 static void initialize_impl (instanceKlassHandle this_k, TRAPS); 1264 static void initialize_super_interfaces (instanceKlassHandle this_k, TRAPS); 1265 static void eager_initialize_impl (instanceKlassHandle this_k); 1266 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_k, ClassState state, TRAPS); 1267 static void call_class_initializer_impl (instanceKlassHandle this_k, TRAPS); 1268 static Klass* array_klass_impl (instanceKlassHandle this_k, bool or_null, int n, TRAPS); 1269 static void do_local_static_fields_impl (instanceKlassHandle this_k, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS); 1270 /* jni_id_for_impl for jfieldID only */ 1271 static JNIid* jni_id_for_impl (instanceKlassHandle this_k, int offset); 1272 1273 // Returns the array class for the n'th dimension 1274 Klass* array_klass_impl(bool or_null, int n, TRAPS); 1275 1276 // Returns the array class with this class as element type 1277 Klass* array_klass_impl(bool or_null, TRAPS); 1278 1279 // find a local method (returns NULL if not found) 1280 Method* find_method_impl(const Symbol* name, 1281 const Symbol* signature, 1282 OverpassLookupMode overpass_mode, 1283 StaticLookupMode static_mode, 1284 PrivateLookupMode private_mode) const; 1285 1286 static Method* find_method_impl(const Array<Method*>* methods, 1287 const Symbol* name, 1288 const Symbol* signature, 1289 OverpassLookupMode overpass_mode, 1290 StaticLookupMode static_mode, 1291 PrivateLookupMode private_mode); 1292 1293 // Free CHeap allocated fields. 1294 void release_C_heap_structures(); 1295 1296 #if INCLUDE_JVMTI 1297 // RedefineClasses support 1298 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1299 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1300 #endif 1301 public: 1302 // CDS support - remove and restore oops from metadata. Oops are not shared. 1303 virtual void remove_unshareable_info(); 1304 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 1305 1306 // jvm support 1307 jint compute_modifier_flags(TRAPS) const; 1308 1309 // JSR-292 support 1310 MemberNameTable* member_names() { return _member_names; } 1311 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; } 1312 bool add_member_name(Handle member_name); 1313 1314 public: 1315 // JVMTI support 1316 jint jvmti_class_status() const; 1317 1318 public: 1319 // Printing 1320 #ifndef PRODUCT 1321 void print_on(outputStream* st) const; 1322 #endif 1323 void print_value_on(outputStream* st) const; 1324 1325 void oop_print_value_on(oop obj, outputStream* st); 1326 1327 #ifndef PRODUCT 1328 void oop_print_on (oop obj, outputStream* st); 1329 1330 void print_dependent_nmethods(bool verbose = false); 1331 bool is_dependent_nmethod(nmethod* nm); 1332 #endif 1333 1334 const char* internal_name() const; 1335 1336 // Verification 1337 void verify_on(outputStream* st); 1338 1339 void oop_verify_on(oop obj, outputStream* st); 1340 1341 // Logging 1342 void print_loading_log(LogLevel::type type, ClassLoaderData* loader_data, 1343 const char* module_name, const ClassFileStream* cfs) const; 1344 }; 1345 1346 // for adding methods 1347 // UNSET_IDNUM return means no more ids available 1348 inline u2 InstanceKlass::next_method_idnum() { 1349 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1350 return ConstMethod::UNSET_IDNUM; // no more ids available 1351 } else { 1352 return _idnum_allocated_count++; 1353 } 1354 } 1355 1356 1357 /* JNIid class for jfieldIDs only */ 1358 class JNIid: public CHeapObj<mtClass> { 1359 friend class VMStructs; 1360 private: 1361 Klass* _holder; 1362 JNIid* _next; 1363 int _offset; 1364 #ifdef ASSERT 1365 bool _is_static_field_id; 1366 #endif 1367 1368 public: 1369 // Accessors 1370 Klass* holder() const { return _holder; } 1371 int offset() const { return _offset; } 1372 JNIid* next() { return _next; } 1373 // Constructor 1374 JNIid(Klass* holder, int offset, JNIid* next); 1375 // Identifier lookup 1376 JNIid* find(int offset); 1377 1378 bool find_local_field(fieldDescriptor* fd) { 1379 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1380 } 1381 1382 static void deallocate(JNIid* id); 1383 // Debugging 1384 #ifdef ASSERT 1385 bool is_static_field_id() const { return _is_static_field_id; } 1386 void set_is_static_field_id() { _is_static_field_id = true; } 1387 #endif 1388 void verify(Klass* holder); 1389 }; 1390 1391 // An iterator that's used to access the inner classes indices in the 1392 // InstanceKlass::_inner_classes array. 1393 class InnerClassesIterator : public StackObj { 1394 private: 1395 Array<jushort>* _inner_classes; 1396 int _length; 1397 int _idx; 1398 public: 1399 1400 InnerClassesIterator(instanceKlassHandle k) { 1401 _inner_classes = k->inner_classes(); 1402 if (k->inner_classes() != NULL) { 1403 _length = _inner_classes->length(); 1404 // The inner class array's length should be the multiple of 1405 // inner_class_next_offset if it only contains the InnerClasses 1406 // attribute data, or it should be 1407 // n*inner_class_next_offset+enclosing_method_attribute_size 1408 // if it also contains the EnclosingMethod data. 1409 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1410 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1411 "just checking"); 1412 // Remove the enclosing_method portion if exists. 1413 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1414 _length -= InstanceKlass::enclosing_method_attribute_size; 1415 } 1416 } else { 1417 _length = 0; 1418 } 1419 _idx = 0; 1420 } 1421 1422 int length() const { 1423 return _length; 1424 } 1425 1426 void next() { 1427 _idx += InstanceKlass::inner_class_next_offset; 1428 } 1429 1430 bool done() const { 1431 return (_idx >= _length); 1432 } 1433 1434 u2 inner_class_info_index() const { 1435 return _inner_classes->at( 1436 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1437 } 1438 1439 void set_inner_class_info_index(u2 index) { 1440 _inner_classes->at_put( 1441 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1442 } 1443 1444 u2 outer_class_info_index() const { 1445 return _inner_classes->at( 1446 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1447 } 1448 1449 void set_outer_class_info_index(u2 index) { 1450 _inner_classes->at_put( 1451 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1452 } 1453 1454 u2 inner_name_index() const { 1455 return _inner_classes->at( 1456 _idx + InstanceKlass::inner_class_inner_name_offset); 1457 } 1458 1459 void set_inner_name_index(u2 index) { 1460 _inner_classes->at_put( 1461 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1462 } 1463 1464 u2 inner_access_flags() const { 1465 return _inner_classes->at( 1466 _idx + InstanceKlass::inner_class_access_flags_offset); 1467 } 1468 }; 1469 1470 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP