1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_OOPS_INSTANCEKLASS_HPP 26 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP 27 28 #include "classfile/classLoader.hpp" 29 #include "classfile/classLoaderData.hpp" 30 #include "classfile/moduleEntry.hpp" 31 #include "classfile/packageEntry.hpp" 32 #include "gc/shared/specialized_oop_closures.hpp" 33 #include "memory/referenceType.hpp" 34 #include "oops/annotations.hpp" 35 #include "oops/constMethod.hpp" 36 #include "oops/fieldInfo.hpp" 37 #include "oops/instanceOop.hpp" 38 #include "oops/klassVtable.hpp" 39 #include "runtime/handles.hpp" 40 #include "runtime/os.hpp" 41 #include "trace/traceMacros.hpp" 42 #include "utilities/accessFlags.hpp" 43 #include "utilities/bitMap.inline.hpp" 44 #include "utilities/macros.hpp" 45 46 // An InstanceKlass is the VM level representation of a Java class. 47 // It contains all information needed for at class at execution runtime. 48 49 // InstanceKlass embedded field layout (after declared fields): 50 // [EMBEDDED Java vtable ] size in words = vtable_len 51 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size 52 // The embedded nonstatic oop-map blocks are short pairs (offset, length) 53 // indicating where oops are located in instances of this klass. 54 // [EMBEDDED implementor of the interface] only exist for interface 55 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled) 56 // [EMBEDDED fingerprint ] only if should_store_fingerprint()==true 57 58 59 // forward declaration for class -- see below for definition 60 #if INCLUDE_JVMTI 61 class BreakpointInfo; 62 #endif 63 class ClassFileParser; 64 class KlassDepChange; 65 class DependencyContext; 66 class fieldDescriptor; 67 class jniIdMapBase; 68 class JNIid; 69 class JvmtiCachedClassFieldMap; 70 class 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 void increment_count(int diff) { _count += diff; } 104 105 int offset_span() const { return _count * heapOopSize; } 106 107 int end_offset() const { 108 return offset() + offset_span(); 109 } 110 111 bool is_contiguous(int another_offset) const { 112 return another_offset == end_offset(); 113 } 114 115 // sizeof(OopMapBlock) in words. 116 static const int size_in_words() { 117 return align_size_up(int(sizeof(OopMapBlock)), wordSize) >> 118 LogBytesPerWord; 119 } 120 121 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) { 122 return a->offset() - b->offset(); 123 } 124 125 private: 126 int _offset; 127 uint _count; 128 }; 129 130 struct JvmtiCachedClassFileData; 131 132 class InstanceKlass: public Klass { 133 friend class VMStructs; 134 friend class JVMCIVMStructs; 135 friend class ClassFileParser; 136 friend class CompileReplay; 137 138 protected: 139 InstanceKlass(const ClassFileParser& parser, unsigned kind); 140 141 public: 142 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } 143 144 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 145 // of the class loading & initialization procedure, and the use of the states. 146 enum ClassState { 147 allocated, // allocated (but not yet linked) 148 loaded, // loaded and inserted in class hierarchy (but not linked yet) 149 linked, // successfully linked/verified (but not initialized yet) 150 being_initialized, // currently running class initializer 151 fully_initialized, // initialized (successfull final state) 152 initialization_error // error happened during initialization 153 }; 154 155 static int number_of_instance_classes() { return _total_instanceKlass_count; } 156 157 private: 158 static volatile int _total_instanceKlass_count; 159 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS); 160 161 protected: 162 // Annotations for this class 163 Annotations* _annotations; 164 // Package this class is defined in 165 PackageEntry* _package_entry; 166 // Array classes holding elements of this class. 167 Klass* volatile _array_klasses; 168 // Constant pool for this class. 169 ConstantPool* _constants; 170 // The InnerClasses attribute and EnclosingMethod attribute. The 171 // _inner_classes is an array of shorts. If the class has InnerClasses 172 // attribute, then the _inner_classes array begins with 4-tuples of shorts 173 // [inner_class_info_index, outer_class_info_index, 174 // inner_name_index, inner_class_access_flags] for the InnerClasses 175 // attribute. If the EnclosingMethod attribute exists, it occupies the 176 // last two shorts [class_index, method_index] of the array. If only 177 // the InnerClasses attribute exists, the _inner_classes array length is 178 // number_of_inner_classes * 4. If the class has both InnerClasses 179 // and EnclosingMethod attributes the _inner_classes array length is 180 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 181 Array<jushort>* _inner_classes; 182 183 // the source debug extension for this klass, NULL if not specified. 184 // Specified as UTF-8 string without terminating zero byte in the classfile, 185 // it is stored in the instanceklass as a NULL-terminated UTF-8 string 186 const char* _source_debug_extension; 187 // Array name derived from this class which needs unreferencing 188 // if this class is unloaded. 189 Symbol* _array_name; 190 191 // Number of heapOopSize words used by non-static fields in this klass 192 // (including inherited fields but after header_size()). 193 int _nonstatic_field_size; 194 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 195 // Constant pool index to the utf8 entry of the Generic signature, 196 // or 0 if none. 197 u2 _generic_signature_index; 198 // Constant pool index to the utf8 entry for the name of source file 199 // containing this klass, 0 if not specified. 200 u2 _source_file_name_index; 201 u2 _static_oop_field_count;// number of static oop fields in this klass 202 u2 _java_fields_count; // The number of declared Java fields 203 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 204 205 int _itable_len; // length of Java itable (in words) 206 // _is_marked_dependent can be set concurrently, thus cannot be part of the 207 // _misc_flags. 208 bool _is_marked_dependent; // used for marking during flushing and deoptimization 209 210 enum { 211 _extra_is_being_redefined = 1 << 0, // used for locking redefinition 212 _extra_has_value_fields = 1 << 1, // has value fields and related embedded section is not empty 213 _extra_has_vcc_klass = 1 << 2 // has a pointer to its Value Capable Class (MVT) 214 }; 215 216 u1 _extra_flags; 217 218 // The low three bits of _misc_flags contains the kind field. 219 // This can be used to quickly discriminate among the five kinds of 220 // InstanceKlass. 221 222 static const unsigned _misc_kind_field_size = 3; 223 static const unsigned _misc_kind_field_pos = 0; 224 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u; 225 226 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass 227 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass 228 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass 229 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass 230 static const unsigned _misc_kind_value_type = 4; // ValueKlass 231 232 // Start after _misc_kind field. 233 enum { 234 _misc_rewritten = 1 << 3, // methods rewritten. 235 _misc_has_nonstatic_fields = 1 << 4, // for sizing with UseCompressedOops 236 _misc_should_verify_class = 1 << 5, // allow caching of preverification 237 _misc_is_anonymous = 1 << 6, // has embedded _host_klass field 238 _misc_is_contended = 1 << 7, // marked with contended annotation 239 _misc_has_nonstatic_concrete_methods = 1 << 8, // class/superclass/implemented interfaces has non-static, concrete methods 240 _misc_declares_nonstatic_concrete_methods = 1 << 9, // directly declares non-static, concrete methods 241 _misc_has_been_redefined = 1 << 10, // class has been redefined 242 _misc_has_passed_fingerprint_check = 1 << 11, // when this class was loaded, the fingerprint computed from its 243 // code source was found to be matching the value recorded by AOT. 244 _misc_is_scratch_class = 1 << 12, // class is the redefined scratch class 245 _misc_is_shared_boot_class = 1 << 13, // defining class loader is boot class loader 246 _misc_is_shared_platform_class = 1 << 14, // defining class loader is platform class loader 247 _misc_is_shared_app_class = 1 << 15 // defining class loader is app class loader 248 }; 249 u2 loader_type_bits() { 250 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class; 251 } 252 u2 _misc_flags; 253 u2 _minor_version; // minor version number of class file 254 u2 _major_version; // major version number of class file 255 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) 256 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 257 MemberNameTable* _member_names; // Member names 258 JNIid* _jni_ids; // First JNI identifier for static fields in this class 259 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 260 intptr_t _dep_context; // packed DependencyContext structure 261 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 262 #if INCLUDE_JVMTI 263 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 264 // Linked instanceKlasses of previous versions 265 InstanceKlass* _previous_versions; 266 // JVMTI fields can be moved to their own structure - see 6315920 267 // JVMTI: cached class file, before retransformable agent modified it in CFLH 268 JvmtiCachedClassFileData* _cached_class_file; 269 #endif 270 271 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 272 273 // Class states are defined as ClassState (see above). 274 // Place the _init_state here to utilize the unused 2-byte after 275 // _idnum_allocated_count. 276 u1 _init_state; // state of class 277 u1 _reference_type; // reference type 278 279 #if INCLUDE_JVMTI 280 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 281 #endif 282 283 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 284 285 // Method array. 286 Array<Method*>* _methods; 287 // Default Method Array, concrete methods inherited from interfaces 288 Array<Method*>* _default_methods; 289 // Interface (Klass*s) this class declares locally to implement. 290 Array<Klass*>* _local_interfaces; 291 // Interface (Klass*s) this class implements transitively. 292 Array<Klass*>* _transitive_interfaces; 293 // Int array containing the original order of method in the class file (for JVMTI). 294 Array<int>* _method_ordering; 295 // Int array containing the vtable_indices for default_methods 296 // offset matches _default_methods offset 297 Array<int>* _default_vtable_indices; 298 299 // Instance and static variable information, starts with 6-tuples of shorts 300 // [access, name index, sig index, initval index, low_offset, high_offset] 301 // for all fields, followed by the generic signature data at the end of 302 // the array. Only fields with generic signature attributes have the generic 303 // signature data set in the array. The fields array looks like following: 304 // 305 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 306 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 307 // ... 308 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 309 // [generic signature index] 310 // [generic signature index] 311 // ... 312 Array<u2>* _fields; 313 314 // embedded Java vtable follows here 315 // embedded Java itables follows here 316 // embedded static fields follows here 317 // embedded nonstatic oop-map blocks follows here 318 // embedded implementor of this interface follows here 319 // The embedded implementor only exists if the current klass is an 320 // iterface. The possible values of the implementor fall into following 321 // three cases: 322 // NULL: no implementor. 323 // A Klass* that's not itself: one implementor. 324 // Itself: more than one implementors. 325 // embedded host klass follows here 326 // The embedded host klass only exists in an anonymous class for 327 // dynamic language support (JSR 292 enabled). The host class grants 328 // its access privileges to this class also. The host class is either 329 // named, or a previously loaded anonymous class. A non-anonymous class 330 // or an anonymous class loaded through normal classloading does not 331 // have this embedded field. 332 // 333 334 friend class SystemDictionary; 335 336 public: 337 u2 loader_type() { 338 return _misc_flags & loader_type_bits(); 339 } 340 341 bool is_shared_boot_class() const { 342 return (_misc_flags & _misc_is_shared_boot_class) != 0; 343 } 344 bool is_shared_platform_class() const { 345 return (_misc_flags & _misc_is_shared_platform_class) != 0; 346 } 347 bool is_shared_app_class() const { 348 return (_misc_flags & _misc_is_shared_app_class) != 0; 349 } 350 351 void set_class_loader_type(s2 loader_type) { 352 assert(( _misc_flags & loader_type_bits()) == 0, 353 "Should only be called once for each class."); 354 switch (loader_type) { 355 case ClassLoader::BOOT_LOADER: 356 _misc_flags |= _misc_is_shared_boot_class; 357 break; 358 case ClassLoader::PLATFORM_LOADER: 359 _misc_flags |= _misc_is_shared_platform_class; 360 break; 361 case ClassLoader::APP_LOADER: 362 _misc_flags |= _misc_is_shared_app_class; 363 break; 364 default: 365 ShouldNotReachHere(); 366 break; 367 } 368 } 369 370 bool has_nonstatic_fields() const { 371 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 372 } 373 void set_has_nonstatic_fields(bool b) { 374 if (b) { 375 _misc_flags |= _misc_has_nonstatic_fields; 376 } else { 377 _misc_flags &= ~_misc_has_nonstatic_fields; 378 } 379 } 380 381 bool has_value_fields() const { 382 return (_extra_flags & _extra_has_value_fields) != 0; 383 } 384 void set_has_value_fields() { 385 _extra_flags |= _extra_has_value_fields; 386 } 387 388 bool has_vcc_klass() const { 389 return (_extra_flags & _extra_has_vcc_klass) != 0; 390 } 391 void set_has_vcc_klass() { 392 _extra_flags |= _extra_has_vcc_klass; 393 } 394 395 396 // field sizes 397 int nonstatic_field_size() const { return _nonstatic_field_size; } 398 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 399 400 int static_field_size() const { return _static_field_size; } 401 void set_static_field_size(int size) { _static_field_size = size; } 402 403 int static_oop_field_count() const { return (int)_static_oop_field_count; } 404 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 405 406 // Java itable 407 int itable_length() const { return _itable_len; } 408 void set_itable_length(int len) { _itable_len = len; } 409 410 // array klasses 411 Klass* array_klasses() const { return _array_klasses; } 412 inline Klass* array_klasses_acquire() const; // load with acquire semantics 413 void set_array_klasses(Klass* k) { _array_klasses = k; } 414 inline void release_set_array_klasses(Klass* k); // store with release semantics 415 416 // methods 417 Array<Method*>* methods() const { return _methods; } 418 void set_methods(Array<Method*>* a) { _methods = a; } 419 Method* method_with_idnum(int idnum); 420 Method* method_with_orig_idnum(int idnum); 421 Method* method_with_orig_idnum(int idnum, int version); 422 423 // method ordering 424 Array<int>* method_ordering() const { return _method_ordering; } 425 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 426 void copy_method_ordering(const intArray* m, TRAPS); 427 428 // default_methods 429 Array<Method*>* default_methods() const { return _default_methods; } 430 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 431 432 // default method vtable_indices 433 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 434 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 435 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 436 437 // interfaces 438 Array<Klass*>* local_interfaces() const { return _local_interfaces; } 439 void set_local_interfaces(Array<Klass*>* a) { 440 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 441 _local_interfaces = a; } 442 443 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; } 444 void set_transitive_interfaces(Array<Klass*>* a) { 445 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 446 _transitive_interfaces = a; 447 } 448 449 private: 450 friend class fieldDescriptor; 451 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 452 453 public: 454 int field_offset (int index) const { return field(index)->offset(); } 455 int field_access_flags(int index) const { return field(index)->access_flags(); } 456 Symbol* field_name (int index) const { return field(index)->name(constants()); } 457 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 458 459 // Number of Java declared fields 460 int java_fields_count() const { return (int)_java_fields_count; } 461 462 Array<u2>* fields() const { return _fields; } 463 void set_fields(Array<u2>* f, u2 java_fields_count) { 464 guarantee(_fields == NULL || f == NULL, "Just checking"); 465 _fields = f; 466 _java_fields_count = java_fields_count; 467 } 468 469 // inner classes 470 Array<u2>* inner_classes() const { return _inner_classes; } 471 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 472 473 enum InnerClassAttributeOffset { 474 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 475 inner_class_inner_class_info_offset = 0, 476 inner_class_outer_class_info_offset = 1, 477 inner_class_inner_name_offset = 2, 478 inner_class_access_flags_offset = 3, 479 inner_class_next_offset = 4 480 }; 481 482 enum EnclosingMethodAttributeOffset { 483 enclosing_method_class_index_offset = 0, 484 enclosing_method_method_index_offset = 1, 485 enclosing_method_attribute_size = 2 486 }; 487 488 // method override check 489 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 490 491 // package 492 PackageEntry* package() const { return _package_entry; } 493 ModuleEntry* module() const; 494 bool in_unnamed_package() const { return (_package_entry == NULL); } 495 void set_package(PackageEntry* p) { _package_entry = p; } 496 void set_package(ClassLoaderData* loader_data, TRAPS); 497 bool is_same_class_package(const Klass* class2) const; 498 bool is_same_class_package(oop classloader2, const Symbol* classname2) const; 499 static bool is_same_class_package(oop class_loader1, 500 const Symbol* class_name1, 501 oop class_loader2, 502 const Symbol* class_name2); 503 504 // find an enclosing class 505 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const; 506 507 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index. 508 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const; 509 510 private: 511 // Check prohibited package ("java/" only loadable by boot or platform loaders) 512 static void check_prohibited_package(Symbol* class_name, 513 Handle class_loader, 514 TRAPS); 515 public: 516 // tell if two classes have the same enclosing class (at package level) 517 bool is_same_package_member(const Klass* class2, TRAPS) const; 518 519 // initialization state 520 bool is_loaded() const { return _init_state >= loaded; } 521 bool is_linked() const { return _init_state >= linked; } 522 bool is_initialized() const { return _init_state == fully_initialized; } 523 bool is_not_initialized() const { return _init_state < being_initialized; } 524 bool is_being_initialized() const { return _init_state == being_initialized; } 525 bool is_in_error_state() const { return _init_state == initialization_error; } 526 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 527 ClassState init_state() { return (ClassState)_init_state; } 528 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 529 530 // defineClass specified verification 531 bool should_verify_class() const { 532 return (_misc_flags & _misc_should_verify_class) != 0; 533 } 534 void set_should_verify_class(bool value) { 535 if (value) { 536 _misc_flags |= _misc_should_verify_class; 537 } else { 538 _misc_flags &= ~_misc_should_verify_class; 539 } 540 } 541 542 // marking 543 bool is_marked_dependent() const { return _is_marked_dependent; } 544 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 545 546 // initialization (virtuals from Klass) 547 bool should_be_initialized() const; // means that initialize should be called 548 void initialize(TRAPS); 549 void link_class(TRAPS); 550 bool link_class_or_fail(TRAPS); // returns false on failure 551 void unlink_class(); 552 void rewrite_class(TRAPS); 553 void link_methods(TRAPS); 554 Method* class_initializer() const; 555 556 // set the class to initialized if no static initializer is present 557 void eager_initialize(Thread *thread); 558 559 // reference type 560 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 561 void set_reference_type(ReferenceType t) { 562 assert(t == (u1)t, "overflow"); 563 _reference_type = (u1)t; 564 } 565 566 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 567 568 // find local field, returns true if found 569 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 570 // find field in direct superinterfaces, returns the interface in which the field is defined 571 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 572 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 573 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 574 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 575 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 576 577 // find a non-static or static field given its offset within the class. 578 bool contains_field_offset(int offset) { 579 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size(), is_value()); 580 } 581 582 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 583 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 584 585 // find a local method (returns NULL if not found) 586 Method* find_method(const Symbol* name, const Symbol* signature) const; 587 static Method* find_method(const Array<Method*>* methods, 588 const Symbol* name, 589 const Symbol* signature); 590 591 // find a local method, but skip static methods 592 Method* find_instance_method(const Symbol* name, const Symbol* signature) const; 593 static Method* find_instance_method(const Array<Method*>* methods, 594 const Symbol* name, 595 const Symbol* signature); 596 597 // find a local method (returns NULL if not found) 598 Method* find_local_method(const Symbol* name, 599 const Symbol* signature, 600 OverpassLookupMode overpass_mode, 601 StaticLookupMode static_mode, 602 PrivateLookupMode private_mode) const; 603 604 // find a local method from given methods array (returns NULL if not found) 605 static Method* find_local_method(const Array<Method*>* methods, 606 const Symbol* name, 607 const Symbol* signature, 608 OverpassLookupMode overpass_mode, 609 StaticLookupMode static_mode, 610 PrivateLookupMode private_mode); 611 612 // find a local method index in methods or default_methods (returns -1 if not found) 613 static int find_method_index(const Array<Method*>* methods, 614 const Symbol* name, 615 const Symbol* signature, 616 OverpassLookupMode overpass_mode, 617 StaticLookupMode static_mode, 618 PrivateLookupMode private_mode); 619 620 // lookup operation (returns NULL if not found) 621 Method* uncached_lookup_method(const Symbol* name, 622 const Symbol* signature, 623 OverpassLookupMode overpass_mode) const; 624 625 // lookup a method in all the interfaces that this class implements 626 // (returns NULL if not found) 627 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 628 629 // lookup a method in local defaults then in all interfaces 630 // (returns NULL if not found) 631 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 632 633 // Find method indices by name. If a method with the specified name is 634 // found the index to the first method is returned, and 'end' is filled in 635 // with the index of first non-name-matching method. If no method is found 636 // -1 is returned. 637 int find_method_by_name(const Symbol* name, int* end) const; 638 static int find_method_by_name(const Array<Method*>* methods, 639 const Symbol* name, int* end); 640 641 // constant pool 642 ConstantPool* constants() const { return _constants; } 643 void set_constants(ConstantPool* c) { _constants = c; } 644 645 // protection domain 646 oop protection_domain() const; 647 648 // signers 649 objArrayOop signers() const; 650 651 // host class 652 InstanceKlass* host_klass() const { 653 InstanceKlass** hk = adr_host_klass(); 654 if (hk == NULL) { 655 return NULL; 656 } else { 657 assert(*hk != NULL, "host klass should always be set if the address is not null"); 658 return *hk; 659 } 660 } 661 void set_host_klass(const InstanceKlass* host) { 662 assert(is_anonymous(), "not anonymous"); 663 const InstanceKlass** addr = (const InstanceKlass **)adr_host_klass(); 664 assert(addr != NULL, "no reversed space"); 665 if (addr != NULL) { 666 *addr = host; 667 } 668 } 669 bool is_anonymous() const { 670 return (_misc_flags & _misc_is_anonymous) != 0; 671 } 672 void set_is_anonymous(bool value) { 673 if (value) { 674 _misc_flags |= _misc_is_anonymous; 675 } else { 676 _misc_flags &= ~_misc_is_anonymous; 677 } 678 } 679 680 // Oop that keeps the metadata for this class from being unloaded 681 // in places where the metadata is stored in other places, like nmethods 682 oop klass_holder() const { 683 return is_anonymous() ? java_mirror() : class_loader(); 684 } 685 686 bool is_contended() const { 687 return (_misc_flags & _misc_is_contended) != 0; 688 } 689 void set_is_contended(bool value) { 690 if (value) { 691 _misc_flags |= _misc_is_contended; 692 } else { 693 _misc_flags &= ~_misc_is_contended; 694 } 695 } 696 697 // source file name 698 Symbol* source_file_name() const { 699 return (_source_file_name_index == 0) ? 700 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index); 701 } 702 u2 source_file_name_index() const { 703 return _source_file_name_index; 704 } 705 void set_source_file_name_index(u2 sourcefile_index) { 706 _source_file_name_index = sourcefile_index; 707 } 708 709 // minor and major version numbers of class file 710 u2 minor_version() const { return _minor_version; } 711 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 712 u2 major_version() const { return _major_version; } 713 void set_major_version(u2 major_version) { _major_version = major_version; } 714 715 // source debug extension 716 const char* source_debug_extension() const { return _source_debug_extension; } 717 void set_source_debug_extension(const char* array, int length); 718 719 // symbol unloading support (refcount already added) 720 Symbol* array_name() { return _array_name; } 721 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; } 722 723 // nonstatic oop-map blocks 724 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 725 return oop_map_count * OopMapBlock::size_in_words(); 726 } 727 unsigned int nonstatic_oop_map_count() const { 728 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 729 } 730 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 731 void set_nonstatic_oop_map_size(int words) { 732 _nonstatic_oop_map_size = words; 733 } 734 735 #if INCLUDE_JVMTI 736 // Redefinition locking. Class can only be redefined by one thread at a time. 737 bool is_being_redefined() const { 738 return (_extra_flags & _extra_is_being_redefined); 739 } 740 void set_is_being_redefined(bool value) { 741 if (value) { 742 _extra_flags |= _extra_is_being_redefined; 743 } else { 744 _extra_flags &= ~_extra_is_being_redefined; 745 } 746 } 747 748 // RedefineClasses() support for previous versions: 749 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 750 void purge_previous_version_list(); 751 752 InstanceKlass* previous_versions() const { return _previous_versions; } 753 #else 754 InstanceKlass* previous_versions() const { return NULL; } 755 #endif 756 757 InstanceKlass* get_klass_version(int version) { 758 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 759 if (ik->constants()->version() == version) { 760 return ik; 761 } 762 } 763 return NULL; 764 } 765 766 bool has_been_redefined() const { 767 return (_misc_flags & _misc_has_been_redefined) != 0; 768 } 769 void set_has_been_redefined() { 770 _misc_flags |= _misc_has_been_redefined; 771 } 772 773 bool has_passed_fingerprint_check() const { 774 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0; 775 } 776 void set_has_passed_fingerprint_check(bool b) { 777 if (b) { 778 _misc_flags |= _misc_has_passed_fingerprint_check; 779 } else { 780 _misc_flags &= ~_misc_has_passed_fingerprint_check; 781 } 782 } 783 bool supers_have_passed_fingerprint_checks(); 784 785 static bool should_store_fingerprint(); 786 bool has_stored_fingerprint() const; 787 uint64_t get_stored_fingerprint() const; 788 void store_fingerprint(uint64_t fingerprint); 789 790 bool is_scratch_class() const { 791 return (_misc_flags & _misc_is_scratch_class) != 0; 792 } 793 794 void set_is_scratch_class() { 795 _misc_flags |= _misc_is_scratch_class; 796 } 797 798 private: 799 800 void set_kind(unsigned kind) { 801 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind"); 802 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos; 803 unsigned flags = _misc_flags & ~fmask; 804 _misc_flags = (flags | (kind << _misc_kind_field_pos)); 805 } 806 807 bool is_kind(unsigned desired) const { 808 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask; 809 return kind == desired; 810 } 811 812 public: 813 814 // Other is anything that is not one of the more specialized kinds of InstanceKlass. 815 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); } 816 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); } 817 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); } 818 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); } 819 bool is_value_type_klass() const { return is_kind(_misc_kind_value_type); } 820 821 #if INCLUDE_JVMTI 822 823 void init_previous_versions() { 824 _previous_versions = NULL; 825 } 826 827 private: 828 static bool _has_previous_versions; 829 public: 830 static void purge_previous_versions(InstanceKlass* ik) { 831 if (ik->has_been_redefined()) { 832 ik->purge_previous_version_list(); 833 } 834 } 835 836 static bool has_previous_versions_and_reset(); 837 838 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 839 void set_cached_class_file(JvmtiCachedClassFileData *data) { 840 _cached_class_file = data; 841 } 842 JvmtiCachedClassFileData * get_cached_class_file(); 843 jint get_cached_class_file_len(); 844 unsigned char * get_cached_class_file_bytes(); 845 846 // JVMTI: Support for caching of field indices, types, and offsets 847 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 848 _jvmti_cached_class_field_map = descriptor; 849 } 850 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 851 return _jvmti_cached_class_field_map; 852 } 853 854 #if INCLUDE_CDS 855 void set_archived_class_data(JvmtiCachedClassFileData* data) { 856 _cached_class_file = data; 857 } 858 859 JvmtiCachedClassFileData * get_archived_class_data(); 860 #endif // INCLUDE_CDS 861 #else // INCLUDE_JVMTI 862 863 static void purge_previous_versions(InstanceKlass* ik) { return; }; 864 static bool has_previous_versions_and_reset() { return false; } 865 866 void set_cached_class_file(JvmtiCachedClassFileData *data) { 867 assert(data == NULL, "unexpected call with JVMTI disabled"); 868 } 869 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; } 870 871 #endif // INCLUDE_JVMTI 872 873 bool has_nonstatic_concrete_methods() const { 874 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0; 875 } 876 void set_has_nonstatic_concrete_methods(bool b) { 877 if (b) { 878 _misc_flags |= _misc_has_nonstatic_concrete_methods; 879 } else { 880 _misc_flags &= ~_misc_has_nonstatic_concrete_methods; 881 } 882 } 883 884 bool declares_nonstatic_concrete_methods() const { 885 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0; 886 } 887 void set_declares_nonstatic_concrete_methods(bool b) { 888 if (b) { 889 _misc_flags |= _misc_declares_nonstatic_concrete_methods; 890 } else { 891 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods; 892 } 893 } 894 895 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 896 inline u2 next_method_idnum(); 897 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 898 899 // generics support 900 Symbol* generic_signature() const { 901 return (_generic_signature_index == 0) ? 902 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index); 903 } 904 u2 generic_signature_index() const { 905 return _generic_signature_index; 906 } 907 void set_generic_signature_index(u2 sig_index) { 908 _generic_signature_index = sig_index; 909 } 910 911 u2 enclosing_method_data(int offset) const; 912 u2 enclosing_method_class_index() const { 913 return enclosing_method_data(enclosing_method_class_index_offset); 914 } 915 u2 enclosing_method_method_index() { 916 return enclosing_method_data(enclosing_method_method_index_offset); 917 } 918 void set_enclosing_method_indices(u2 class_index, 919 u2 method_index); 920 921 // jmethodID support 922 jmethodID get_jmethod_id(const methodHandle& method_h); 923 jmethodID get_jmethod_id_fetch_or_update(size_t idnum, 924 jmethodID new_id, jmethodID* new_jmeths, 925 jmethodID* to_dealloc_id_p, 926 jmethodID** to_dealloc_jmeths_p); 927 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 928 size_t *length_p, jmethodID* id_p); 929 void ensure_space_for_methodids(int start_offset = 0); 930 jmethodID jmethod_id_or_null(Method* method); 931 932 // annotations support 933 Annotations* annotations() const { return _annotations; } 934 void set_annotations(Annotations* anno) { _annotations = anno; } 935 936 AnnotationArray* class_annotations() const { 937 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 938 } 939 Array<AnnotationArray*>* fields_annotations() const { 940 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 941 } 942 AnnotationArray* class_type_annotations() const { 943 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 944 } 945 Array<AnnotationArray*>* fields_type_annotations() const { 946 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 947 } 948 // allocation 949 instanceOop allocate_instance(TRAPS); 950 951 // additional member function to return a handle 952 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } 953 954 objArrayOop allocate_objArray(int n, int length, TRAPS); 955 // Helper function 956 static instanceOop register_finalizer(instanceOop i, TRAPS); 957 958 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 959 // if not, throw either an Error or an Exception. 960 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 961 962 // initialization 963 void call_class_initializer(TRAPS); 964 void set_initialization_state_and_notify(ClassState state, TRAPS); 965 966 // OopMapCache support 967 OopMapCache* oop_map_cache() { return _oop_map_cache; } 968 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 969 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 970 971 // JNI identifier support (for static fields - for jni performance) 972 JNIid* jni_ids() { return _jni_ids; } 973 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 974 JNIid* jni_id_for(int offset); 975 976 // maintenance of deoptimization dependencies 977 inline DependencyContext dependencies(); 978 int mark_dependent_nmethods(KlassDepChange& changes); 979 void add_dependent_nmethod(nmethod* nm); 980 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately); 981 982 // On-stack replacement support 983 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 984 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 985 void add_osr_nmethod(nmethod* n); 986 bool remove_osr_nmethod(nmethod* n); 987 int mark_osr_nmethods(const Method* m); 988 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 989 990 #if INCLUDE_JVMTI 991 // Breakpoint support (see methods on Method* for details) 992 BreakpointInfo* breakpoints() const { return _breakpoints; }; 993 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 994 #endif 995 996 // support for stub routines 997 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 998 TRACE_DEFINE_KLASS_TRACE_ID_OFFSET; 999 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 1000 1001 // subclass/subinterface checks 1002 bool implements_interface(Klass* k) const; 1003 bool is_same_or_direct_interface(Klass* k) const; 1004 1005 #ifdef ASSERT 1006 // check whether this class or one of its superclasses was redefined 1007 bool has_redefined_this_or_super() const; 1008 #endif 1009 1010 // Access to the implementor of an interface. 1011 Klass* implementor() const 1012 { 1013 Klass** k = adr_implementor(); 1014 if (k == NULL) { 1015 return NULL; 1016 } else { 1017 return *k; 1018 } 1019 } 1020 1021 void set_implementor(Klass* k) { 1022 assert(is_interface(), "not interface"); 1023 Klass** addr = adr_implementor(); 1024 assert(addr != NULL, "null addr"); 1025 if (addr != NULL) { 1026 *addr = k; 1027 } 1028 } 1029 1030 int nof_implementors() const { 1031 Klass* k = implementor(); 1032 if (k == NULL) { 1033 return 0; 1034 } else if (k != this) { 1035 return 1; 1036 } else { 1037 return 2; 1038 } 1039 } 1040 1041 void add_implementor(Klass* k); // k is a new class that implements this interface 1042 void init_implementor(); // initialize 1043 1044 // link this class into the implementors list of every interface it implements 1045 void process_interfaces(Thread *thread); 1046 1047 // virtual operations from Klass 1048 bool is_leaf_class() const { return _subklass == NULL; } 1049 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); 1050 bool compute_is_subtype_of(Klass* k); 1051 bool can_be_primary_super_slow() const; 1052 int oop_size(oop obj) const { return size_helper(); } 1053 // slow because it's a virtual call and used for verifying the layout_helper. 1054 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 1055 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 1056 1057 // Iterators 1058 void do_local_static_fields(FieldClosure* cl); 1059 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 1060 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 1061 1062 void methods_do(void f(Method* method)); 1063 void array_klasses_do(void f(Klass* k)); 1064 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 1065 bool super_types_do(SuperTypeClosure* blk); 1066 1067 static InstanceKlass* cast(Klass* k) { 1068 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 1069 } 1070 1071 static const InstanceKlass* cast(const Klass* k) { 1072 assert(k != NULL, "k should not be null"); 1073 assert(k->is_instance_klass(), "cast to InstanceKlass"); 1074 return static_cast<const InstanceKlass*>(k); 1075 } 1076 1077 InstanceKlass* java_super() const { 1078 return (super() == NULL) ? NULL : cast(super()); 1079 } 1080 1081 // Sizing (in words) 1082 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 1083 1084 static int size(int vtable_length, int itable_length, 1085 int nonstatic_oop_map_size, 1086 bool is_interface, bool is_anonymous, bool has_stored_fingerprint, 1087 int java_fields, bool is_value_type) { 1088 return align_metadata_size(header_size() + 1089 vtable_length + 1090 itable_length + 1091 nonstatic_oop_map_size + 1092 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) + 1093 (is_anonymous ? (int)sizeof(Klass*)/wordSize : 0) + 1094 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0) + 1095 (java_fields * (int)sizeof(Klass*)/wordSize) + 1096 (is_value_type ? (int)sizeof(Klass*) : 0)); 1097 } 1098 int size() const { return size(vtable_length(), 1099 itable_length(), 1100 nonstatic_oop_map_size(), 1101 is_interface(), 1102 is_anonymous(), 1103 has_stored_fingerprint(), 1104 has_value_fields() ? java_fields_count() : 0, 1105 is_value()); 1106 } 1107 #if INCLUDE_SERVICES 1108 virtual void collect_statistics(KlassSizeStats *sz) const; 1109 #endif 1110 1111 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); } 1112 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 1113 1114 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 1115 1116 address static_field_addr(int offset); 1117 1118 bool bounds_check(address addr, bool edge_ok = false, intptr_t size_in_bytes = -1) const PRODUCT_RETURN0; 1119 1120 OopMapBlock* start_of_nonstatic_oop_maps() const { 1121 return (OopMapBlock*)(start_of_itable() + itable_length()); 1122 } 1123 1124 Klass** end_of_nonstatic_oop_maps() const { 1125 return (Klass**)(start_of_nonstatic_oop_maps() + 1126 nonstatic_oop_map_count()); 1127 } 1128 1129 Klass** adr_implementor() const { 1130 if (is_interface()) { 1131 return (Klass**)end_of_nonstatic_oop_maps(); 1132 } else { 1133 return NULL; 1134 } 1135 }; 1136 1137 InstanceKlass** adr_host_klass() const { 1138 if (is_anonymous()) { 1139 InstanceKlass** adr_impl = (InstanceKlass **)adr_implementor(); 1140 if (adr_impl != NULL) { 1141 return adr_impl + 1; 1142 } else { 1143 return (InstanceKlass **)end_of_nonstatic_oop_maps(); 1144 } 1145 } else { 1146 return NULL; 1147 } 1148 } 1149 1150 address adr_fingerprint() const { 1151 if (has_stored_fingerprint()) { 1152 InstanceKlass** adr_host = adr_host_klass(); 1153 if (adr_host != NULL) { 1154 return (address)(adr_host + 1); 1155 } 1156 1157 Klass** adr_impl = adr_implementor(); 1158 if (adr_impl != NULL) { 1159 return (address)(adr_impl + 1); 1160 } 1161 1162 return (address)end_of_nonstatic_oop_maps(); 1163 } else { 1164 return NULL; 1165 } 1166 } 1167 1168 address adr_value_fields_klasses() const { 1169 if (has_value_fields()) { 1170 address adr_fing = adr_fingerprint(); 1171 if (adr_fing != NULL) { 1172 return adr_fingerprint() + sizeof(u8); 1173 } 1174 1175 InstanceKlass** adr_host = adr_host_klass(); 1176 if (adr_host != NULL) { 1177 return (address)(adr_host + 1); 1178 } 1179 1180 Klass** adr_impl = adr_implementor(); 1181 if (adr_impl != NULL) { 1182 return (address)(adr_impl + 1); 1183 } 1184 1185 return (address)end_of_nonstatic_oop_maps(); 1186 } else { 1187 return NULL; 1188 } 1189 } 1190 1191 address adr_vcc_klass() const { 1192 if (has_vcc_klass()) { 1193 address adr_jf = adr_value_fields_klasses(); 1194 if (adr_jf != NULL) { 1195 return adr_jf + this->java_fields_count() * sizeof(Klass*); 1196 } 1197 1198 address adr_fing = adr_fingerprint(); 1199 if (adr_fing != NULL) { 1200 return adr_fingerprint() + sizeof(u8); 1201 } 1202 1203 InstanceKlass** adr_host = adr_host_klass(); 1204 if (adr_host != NULL) { 1205 return (address)(adr_host + 1); 1206 } 1207 1208 Klass** adr_impl = adr_implementor(); 1209 if (adr_impl != NULL) { 1210 return (address)(adr_impl + 1); 1211 } 1212 1213 return (address)end_of_nonstatic_oop_maps(); 1214 } else { 1215 return NULL; 1216 } 1217 } 1218 1219 Klass* get_value_field_klass(int idx) { 1220 assert(has_value_fields(), "Sanity checking"); 1221 Klass* k = ((Klass**)adr_value_fields_klasses())[idx]; 1222 assert(k != NULL, "Should always be set before being read"); 1223 assert(k->is_value(), "Must be a value type"); 1224 return k; 1225 } 1226 1227 void set_value_field_klass(int idx, Klass* k) { 1228 assert(has_value_fields(), "Sanity checking"); 1229 assert(k != NULL, "Should not be set to NULL"); 1230 assert(((Klass**)adr_value_fields_klasses())[idx] == NULL, "Should not be set twice"); 1231 ((Klass**)adr_value_fields_klasses())[idx] = k; 1232 } 1233 1234 Klass* get_vcc_klass() { 1235 if (has_vcc_klass()) { 1236 Klass* k = *(Klass**)adr_vcc_klass(); 1237 assert(k == NULL || !k->is_value(), "Must not be a value type"); 1238 return k; 1239 } 1240 return NULL; 1241 } 1242 1243 void set_vcc_klass(Klass* k) { 1244 assert(has_vcc_klass(), "Sanity checking"); 1245 assert(k == NULL || !k->is_value(), "Must not be a value type"); 1246 *(Klass**)adr_vcc_klass()= k; 1247 } 1248 1249 // Use this to return the size of an instance in heap words: 1250 virtual int size_helper() const { 1251 return layout_helper_to_size_helper(layout_helper()); 1252 } 1253 1254 // This bit is initialized in classFileParser.cpp. 1255 // It is false under any of the following conditions: 1256 // - the class is abstract (including any interface) 1257 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1258 // - the class size is larger than FastAllocateSizeLimit 1259 // - the class is java/lang/Class, which cannot be allocated directly 1260 bool can_be_fastpath_allocated() const { 1261 return !layout_helper_needs_slow_path(layout_helper()); 1262 } 1263 1264 // Java itable 1265 klassItable itable() const; // return klassItable wrapper 1266 Method* method_at_itable(Klass* holder, int index, TRAPS); 1267 1268 #if INCLUDE_JVMTI 1269 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed); 1270 #endif // INCLUDE_JVMTI 1271 1272 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive); 1273 void clean_implementors_list(BoolObjectClosure* is_alive); 1274 void clean_method_data(BoolObjectClosure* is_alive); 1275 1276 // Explicit metaspace deallocation of fields 1277 // For RedefineClasses and class file parsing errors, we need to deallocate 1278 // instanceKlasses and the metadata they point to. 1279 void deallocate_contents(ClassLoaderData* loader_data); 1280 static void deallocate_methods(ClassLoaderData* loader_data, 1281 Array<Method*>* methods); 1282 void static deallocate_interfaces(ClassLoaderData* loader_data, 1283 const Klass* super_klass, 1284 Array<Klass*>* local_interfaces, 1285 Array<Klass*>* transitive_interfaces); 1286 1287 // The constant pool is on stack if any of the methods are executing or 1288 // referenced by handles. 1289 bool on_stack() const { return _constants->on_stack(); } 1290 1291 // callbacks for actions during class unloading 1292 static void notify_unload_class(InstanceKlass* ik); 1293 static void release_C_heap_structures(InstanceKlass* ik); 1294 1295 // Naming 1296 const char* signature_name() const; 1297 static Symbol* package_from_name(const Symbol* name, TRAPS); 1298 1299 // GC specific object visitors 1300 // 1301 #if INCLUDE_ALL_GCS 1302 // Parallel Scavenge 1303 void oop_ps_push_contents( oop obj, PSPromotionManager* pm); 1304 // Parallel Compact 1305 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm); 1306 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm); 1307 #endif 1308 1309 // Oop fields (and metadata) iterators 1310 // [nv = true] Use non-virtual calls to do_oop_nv. 1311 // [nv = false] Use virtual calls to do_oop. 1312 // 1313 // The InstanceKlass iterators also visits the Object's klass. 1314 1315 // Forward iteration 1316 public: 1317 // Iterate over all oop fields in the oop maps. 1318 template <bool nv, class OopClosureType> 1319 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1320 1321 protected: 1322 // Iterate over all oop fields and metadata. 1323 template <bool nv, class OopClosureType> 1324 inline int oop_oop_iterate(oop obj, OopClosureType* closure); 1325 1326 private: 1327 // Iterate over all oop fields in the oop maps. 1328 // Specialized for [T = oop] or [T = narrowOop]. 1329 template <bool nv, typename T, class OopClosureType> 1330 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure); 1331 1332 // Iterate over all oop fields in one oop map. 1333 template <bool nv, typename T, class OopClosureType> 1334 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1335 1336 1337 // Reverse iteration 1338 #if INCLUDE_ALL_GCS 1339 public: 1340 // Iterate over all oop fields in the oop maps. 1341 template <bool nv, class OopClosureType> 1342 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1343 1344 protected: 1345 // Iterate over all oop fields and metadata. 1346 template <bool nv, class OopClosureType> 1347 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1348 1349 private: 1350 // Iterate over all oop fields in the oop maps. 1351 // Specialized for [T = oop] or [T = narrowOop]. 1352 template <bool nv, typename T, class OopClosureType> 1353 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure); 1354 1355 // Iterate over all oop fields in one oop map. 1356 template <bool nv, typename T, class OopClosureType> 1357 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1358 #endif 1359 1360 1361 // Bounded range iteration 1362 public: 1363 // Iterate over all oop fields in the oop maps. 1364 template <bool nv, class OopClosureType> 1365 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1366 1367 protected: 1368 // Iterate over all oop fields and metadata. 1369 template <bool nv, class OopClosureType> 1370 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1371 1372 private: 1373 // Iterate over all oop fields in the oop maps. 1374 // Specialized for [T = oop] or [T = narrowOop]. 1375 template <bool nv, typename T, class OopClosureType> 1376 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1377 1378 // Iterate over all oop fields in one oop map. 1379 template <bool nv, typename T, class OopClosureType> 1380 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1381 1382 1383 public: 1384 1385 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL) 1386 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL) 1387 1388 #if INCLUDE_ALL_GCS 1389 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS) 1390 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS) 1391 #endif // INCLUDE_ALL_GCS 1392 1393 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1394 1395 public: 1396 void set_in_error_state() { 1397 assert(DumpSharedSpaces, "only call this when dumping archive"); 1398 _init_state = initialization_error; 1399 } 1400 bool check_sharing_error_state(); 1401 1402 private: 1403 // initialization state 1404 #ifdef ASSERT 1405 void set_init_state(ClassState state); 1406 #else 1407 void set_init_state(ClassState state) { _init_state = (u1)state; } 1408 #endif 1409 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1410 void set_init_thread(Thread *thread) { _init_thread = thread; } 1411 1412 // The RedefineClasses() API can cause new method idnums to be needed 1413 // which will cause the caches to grow. Safety requires different 1414 // cache management logic if the caches can grow instead of just 1415 // going from NULL to non-NULL. 1416 bool idnum_can_increment() const { return has_been_redefined(); } 1417 inline jmethodID* methods_jmethod_ids_acquire() const; 1418 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1419 1420 // Lock during initialization 1421 public: 1422 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1423 // Must be one per class and it has to be a VM internal object so java code 1424 // cannot lock it (like the mirror). 1425 // It has to be an object not a Mutex because it's held through java calls. 1426 oop init_lock() const; 1427 private: 1428 void fence_and_clear_init_lock(); 1429 1430 bool link_class_impl (bool throw_verifyerror, TRAPS); 1431 bool verify_code (bool throw_verifyerror, TRAPS); 1432 void initialize_impl (TRAPS); 1433 void initialize_super_interfaces (TRAPS); 1434 void eager_initialize_impl (); 1435 /* jni_id_for_impl for jfieldID only */ 1436 JNIid* jni_id_for_impl (int offset); 1437 protected: 1438 // Returns the array class for the n'th dimension 1439 virtual Klass* array_klass_impl(bool or_null, int n, TRAPS); 1440 1441 // Returns the array class with this class as element type 1442 virtual Klass* array_klass_impl(bool or_null, TRAPS); 1443 1444 private: 1445 1446 // find a local method (returns NULL if not found) 1447 Method* find_method_impl(const Symbol* name, 1448 const Symbol* signature, 1449 OverpassLookupMode overpass_mode, 1450 StaticLookupMode static_mode, 1451 PrivateLookupMode private_mode) const; 1452 1453 static Method* find_method_impl(const Array<Method*>* methods, 1454 const Symbol* name, 1455 const Symbol* signature, 1456 OverpassLookupMode overpass_mode, 1457 StaticLookupMode static_mode, 1458 PrivateLookupMode private_mode); 1459 1460 // Free CHeap allocated fields. 1461 void release_C_heap_structures(); 1462 1463 #if INCLUDE_JVMTI 1464 // RedefineClasses support 1465 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1466 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1467 #endif 1468 public: 1469 // CDS support - remove and restore oops from metadata. Oops are not shared. 1470 virtual void remove_unshareable_info(); 1471 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 1472 1473 // jvm support 1474 jint compute_modifier_flags(TRAPS) const; 1475 1476 // JSR-292 support 1477 MemberNameTable* member_names() { return _member_names; } 1478 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; } 1479 oop add_member_name(Handle member_name, bool intern); 1480 1481 //Valhalla prototype DeriveValueType 1482 void create_derive_value_type(Handle class_loader, Handle protection_domain, TRAPS); 1483 1484 public: 1485 // JVMTI support 1486 jint jvmti_class_status() const; 1487 1488 public: 1489 // Printing 1490 #ifndef PRODUCT 1491 void print_on(outputStream* st) const; 1492 #endif 1493 void print_value_on(outputStream* st) const; 1494 1495 void oop_print_value_on(oop obj, outputStream* st); 1496 1497 #ifndef PRODUCT 1498 void oop_print_on (oop obj, outputStream* st); 1499 1500 void print_dependent_nmethods(bool verbose = false); 1501 bool is_dependent_nmethod(nmethod* nm); 1502 #endif 1503 1504 const char* internal_name() const; 1505 1506 // Verification 1507 void verify_on(outputStream* st); 1508 1509 void oop_verify_on(oop obj, outputStream* st); 1510 1511 // Logging 1512 void print_class_load_logging(ClassLoaderData* loader_data, 1513 const char* module_name, 1514 const ClassFileStream* cfs) const; 1515 }; 1516 1517 // for adding methods 1518 // UNSET_IDNUM return means no more ids available 1519 inline u2 InstanceKlass::next_method_idnum() { 1520 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1521 return ConstMethod::UNSET_IDNUM; // no more ids available 1522 } else { 1523 return _idnum_allocated_count++; 1524 } 1525 } 1526 1527 1528 /* JNIid class for jfieldIDs only */ 1529 class JNIid: public CHeapObj<mtClass> { 1530 friend class VMStructs; 1531 private: 1532 Klass* _holder; 1533 JNIid* _next; 1534 int _offset; 1535 #ifdef ASSERT 1536 bool _is_static_field_id; 1537 #endif 1538 1539 public: 1540 // Accessors 1541 Klass* holder() const { return _holder; } 1542 int offset() const { return _offset; } 1543 JNIid* next() { return _next; } 1544 // Constructor 1545 JNIid(Klass* holder, int offset, JNIid* next); 1546 // Identifier lookup 1547 JNIid* find(int offset); 1548 1549 bool find_local_field(fieldDescriptor* fd) { 1550 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1551 } 1552 1553 static void deallocate(JNIid* id); 1554 // Debugging 1555 #ifdef ASSERT 1556 bool is_static_field_id() const { return _is_static_field_id; } 1557 void set_is_static_field_id() { _is_static_field_id = true; } 1558 #endif 1559 void verify(Klass* holder); 1560 }; 1561 1562 // An iterator that's used to access the inner classes indices in the 1563 // InstanceKlass::_inner_classes array. 1564 class InnerClassesIterator : public StackObj { 1565 private: 1566 Array<jushort>* _inner_classes; 1567 int _length; 1568 int _idx; 1569 public: 1570 1571 InnerClassesIterator(const InstanceKlass* k) { 1572 _inner_classes = k->inner_classes(); 1573 if (k->inner_classes() != NULL) { 1574 _length = _inner_classes->length(); 1575 // The inner class array's length should be the multiple of 1576 // inner_class_next_offset if it only contains the InnerClasses 1577 // attribute data, or it should be 1578 // n*inner_class_next_offset+enclosing_method_attribute_size 1579 // if it also contains the EnclosingMethod data. 1580 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1581 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1582 "just checking"); 1583 // Remove the enclosing_method portion if exists. 1584 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1585 _length -= InstanceKlass::enclosing_method_attribute_size; 1586 } 1587 } else { 1588 _length = 0; 1589 } 1590 _idx = 0; 1591 } 1592 1593 int length() const { 1594 return _length; 1595 } 1596 1597 void next() { 1598 _idx += InstanceKlass::inner_class_next_offset; 1599 } 1600 1601 bool done() const { 1602 return (_idx >= _length); 1603 } 1604 1605 u2 inner_class_info_index() const { 1606 return _inner_classes->at( 1607 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1608 } 1609 1610 void set_inner_class_info_index(u2 index) { 1611 _inner_classes->at_put( 1612 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1613 } 1614 1615 u2 outer_class_info_index() const { 1616 return _inner_classes->at( 1617 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1618 } 1619 1620 void set_outer_class_info_index(u2 index) { 1621 _inner_classes->at_put( 1622 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1623 } 1624 1625 u2 inner_name_index() const { 1626 return _inner_classes->at( 1627 _idx + InstanceKlass::inner_class_inner_name_offset); 1628 } 1629 1630 void set_inner_name_index(u2 index) { 1631 _inner_classes->at_put( 1632 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1633 } 1634 1635 u2 inner_access_flags() const { 1636 return _inner_classes->at( 1637 _idx + InstanceKlass::inner_class_access_flags_offset); 1638 } 1639 }; 1640 1641 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP