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 "code/vmreg.hpp" 33 #include "gc/shared/specialized_oop_closures.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/align.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 // [EMBEDDED fingerprint ] only if should_store_fingerprint()==true 58 // [EMBEDDED ValueKlassFixedBlock] only if is a ValueKlass instance 59 60 61 // forward declaration for class -- see below for definition 62 #if INCLUDE_JVMTI 63 class BreakpointInfo; 64 #endif 65 class ClassFileParser; 66 class KlassDepChange; 67 class DependencyContext; 68 class fieldDescriptor; 69 class jniIdMapBase; 70 class JNIid; 71 class JvmtiCachedClassFieldMap; 72 class SuperTypeClosure; 73 class BufferedValueTypeBlob; 74 75 // This is used in iterators below. 76 class FieldClosure: public StackObj { 77 public: 78 virtual void do_field(fieldDescriptor* fd) = 0; 79 }; 80 81 #ifndef PRODUCT 82 // Print fields. 83 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. 84 class FieldPrinter: public FieldClosure { 85 oop _obj; 86 outputStream* _st; 87 public: 88 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} 89 void do_field(fieldDescriptor* fd); 90 }; 91 #endif // !PRODUCT 92 93 // ValueObjs embedded in klass. Describes where oops are located in instances of 94 // this klass. 95 class OopMapBlock VALUE_OBJ_CLASS_SPEC { 96 public: 97 // Byte offset of the first oop mapped by this block. 98 int offset() const { return _offset; } 99 void set_offset(int offset) { _offset = offset; } 100 101 // Number of oops in this block. 102 uint count() const { return _count; } 103 void set_count(uint count) { _count = count; } 104 105 void increment_count(int diff) { _count += diff; } 106 107 int offset_span() const { return _count * heapOopSize; } 108 109 int end_offset() const { 110 return offset() + offset_span(); 111 } 112 113 bool is_contiguous(int another_offset) const { 114 return another_offset == end_offset(); 115 } 116 117 // sizeof(OopMapBlock) in words. 118 static const int size_in_words() { 119 return align_up((int)sizeof(OopMapBlock), wordSize) >> 120 LogBytesPerWord; 121 } 122 123 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) { 124 return a->offset() - b->offset(); 125 } 126 127 private: 128 int _offset; 129 uint _count; 130 }; 131 132 struct JvmtiCachedClassFileData; 133 134 class SigEntry; 135 136 class ValueKlassFixedBlock VALUE_OBJ_CLASS_SPEC { 137 Array<SigEntry>** _extended_sig; 138 Array<VMRegPair>** _return_regs; 139 address* _pack_handler; 140 address* _unpack_handler; 141 int* _default_value_offset; 142 143 friend class ValueKlass; 144 }; 145 146 class InstanceKlass: public Klass { 147 friend class VMStructs; 148 friend class JVMCIVMStructs; 149 friend class ClassFileParser; 150 friend class CompileReplay; 151 152 protected: 153 InstanceKlass(const ClassFileParser& parser, unsigned kind); 154 155 public: 156 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } 157 158 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 159 // of the class loading & initialization procedure, and the use of the states. 160 enum ClassState { 161 allocated, // allocated (but not yet linked) 162 loaded, // loaded and inserted in class hierarchy (but not linked yet) 163 linked, // successfully linked/verified (but not initialized yet) 164 being_initialized, // currently running class initializer 165 fully_initialized, // initialized (successfull final state) 166 initialization_error // error happened during initialization 167 }; 168 169 static int number_of_instance_classes() { return _total_instanceKlass_count; } 170 171 private: 172 static volatile int _total_instanceKlass_count; 173 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS); 174 175 protected: 176 // If you add a new field that points to any metaspace object, you 177 // must add this field to InstanceKlass::metaspace_pointers_do(). 178 179 // Annotations for this class 180 Annotations* _annotations; 181 // Package this class is defined in 182 PackageEntry* _package_entry; 183 // Array classes holding elements of this class. 184 Klass* volatile _array_klasses; 185 // Constant pool for this class. 186 ConstantPool* _constants; 187 // The InnerClasses attribute and EnclosingMethod attribute. The 188 // _inner_classes is an array of shorts. If the class has InnerClasses 189 // attribute, then the _inner_classes array begins with 4-tuples of shorts 190 // [inner_class_info_index, outer_class_info_index, 191 // inner_name_index, inner_class_access_flags] for the InnerClasses 192 // attribute. If the EnclosingMethod attribute exists, it occupies the 193 // last two shorts [class_index, method_index] of the array. If only 194 // the InnerClasses attribute exists, the _inner_classes array length is 195 // number_of_inner_classes * 4. If the class has both InnerClasses 196 // and EnclosingMethod attributes the _inner_classes array length is 197 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 198 Array<jushort>* _inner_classes; 199 200 // the source debug extension for this klass, NULL if not specified. 201 // Specified as UTF-8 string without terminating zero byte in the classfile, 202 // it is stored in the instanceklass as a NULL-terminated UTF-8 string 203 const char* _source_debug_extension; 204 // Array name derived from this class which needs unreferencing 205 // if this class is unloaded. 206 Symbol* _array_name; 207 208 // Number of heapOopSize words used by non-static fields in this klass 209 // (including inherited fields but after header_size()). 210 int _nonstatic_field_size; 211 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 212 // Constant pool index to the utf8 entry of the Generic signature, 213 // or 0 if none. 214 u2 _generic_signature_index; 215 // Constant pool index to the utf8 entry for the name of source file 216 // containing this klass, 0 if not specified. 217 u2 _source_file_name_index; 218 u2 _static_oop_field_count;// number of static oop fields in this klass 219 u2 _java_fields_count; // The number of declared Java fields 220 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 221 222 int _itable_len; // length of Java itable (in words) 223 // _is_marked_dependent can be set concurrently, thus cannot be part of the 224 // _misc_flags. 225 bool _is_marked_dependent; // used for marking during flushing and deoptimization 226 227 public: 228 enum { 229 _extra_is_being_redefined = 1 << 0, // used for locking redefinition 230 _extra_has_resolved_methods = 1 << 1, // resolved methods table entries added for this class 231 _extra_has_value_fields = 1 << 2, // has value fields and related embedded section is not empty 232 _extra_is_bufferable = 1 << 3 // value can be buffered out side of the Java heap 233 }; 234 235 protected: 236 u1 _extra_flags; 237 238 // The low three bits of _misc_flags contains the kind field. 239 // This can be used to quickly discriminate among the five kinds of 240 // InstanceKlass. 241 242 static const unsigned _misc_kind_field_size = 3; 243 static const unsigned _misc_kind_field_pos = 0; 244 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u; 245 246 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass 247 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass 248 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass 249 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass 250 static const unsigned _misc_kind_value_type = 4; // ValueKlass 251 252 // Start after _misc_kind field. 253 enum { 254 _misc_rewritten = 1 << 3, // methods rewritten. 255 _misc_has_nonstatic_fields = 1 << 4, // for sizing with UseCompressedOops 256 _misc_should_verify_class = 1 << 5, // allow caching of preverification 257 _misc_is_anonymous = 1 << 6, // has embedded _host_klass field 258 _misc_is_contended = 1 << 7, // marked with contended annotation 259 _misc_has_nonstatic_concrete_methods = 1 << 8, // class/superclass/implemented interfaces has non-static, concrete methods 260 _misc_declares_nonstatic_concrete_methods = 1 << 9, // directly declares non-static, concrete methods 261 _misc_has_been_redefined = 1 << 10, // class has been redefined 262 _misc_has_passed_fingerprint_check = 1 << 11, // when this class was loaded, the fingerprint computed from its 263 // code source was found to be matching the value recorded by AOT. 264 _misc_is_scratch_class = 1 << 12, // class is the redefined scratch class 265 _misc_is_shared_boot_class = 1 << 13, // defining class loader is boot class loader 266 _misc_is_shared_platform_class = 1 << 14, // defining class loader is platform class loader 267 _misc_is_shared_app_class = 1 << 15 // defining class loader is app class loader 268 // u2 _misc_flags full (see _extra_flags) 269 }; 270 u2 loader_type_bits() { 271 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class; 272 } 273 u2 _misc_flags; 274 u2 _minor_version; // minor version number of class file 275 u2 _major_version; // major version number of class file 276 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) 277 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 278 JNIid* _jni_ids; // First JNI identifier for static fields in this class 279 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 280 intptr_t _dep_context; // packed DependencyContext structure 281 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 282 #if INCLUDE_JVMTI 283 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 284 // Linked instanceKlasses of previous versions 285 InstanceKlass* _previous_versions; 286 // JVMTI fields can be moved to their own structure - see 6315920 287 // JVMTI: cached class file, before retransformable agent modified it in CFLH 288 JvmtiCachedClassFileData* _cached_class_file; 289 #endif 290 291 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 292 293 // Class states are defined as ClassState (see above). 294 // Place the _init_state here to utilize the unused 2-byte after 295 // _idnum_allocated_count. 296 u1 _init_state; // state of class 297 u1 _reference_type; // reference type 298 299 #if INCLUDE_JVMTI 300 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 301 #endif 302 303 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 304 305 // Method array. 306 Array<Method*>* _methods; 307 // Default Method Array, concrete methods inherited from interfaces 308 Array<Method*>* _default_methods; 309 // Interface (Klass*s) this class declares locally to implement. 310 Array<Klass*>* _local_interfaces; 311 // Interface (Klass*s) this class implements transitively. 312 Array<Klass*>* _transitive_interfaces; 313 // Int array containing the original order of method in the class file (for JVMTI). 314 Array<int>* _method_ordering; 315 // Int array containing the vtable_indices for default_methods 316 // offset matches _default_methods offset 317 Array<int>* _default_vtable_indices; 318 319 // Instance and static variable information, starts with 6-tuples of shorts 320 // [access, name index, sig index, initval index, low_offset, high_offset] 321 // for all fields, followed by the generic signature data at the end of 322 // the array. Only fields with generic signature attributes have the generic 323 // signature data set in the array. The fields array looks like following: 324 // 325 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 326 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 327 // ... 328 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 329 // [generic signature index] 330 // [generic signature index] 331 // ... 332 Array<u2>* _fields; 333 334 // embedded Java vtable follows here 335 // embedded Java itables follows here 336 // embedded static fields follows here 337 // embedded nonstatic oop-map blocks follows here 338 // embedded implementor of this interface follows here 339 // The embedded implementor only exists if the current klass is an 340 // iterface. The possible values of the implementor fall into following 341 // three cases: 342 // NULL: no implementor. 343 // A Klass* that's not itself: one implementor. 344 // Itself: more than one implementors. 345 // embedded host klass follows here 346 // The embedded host klass only exists in an anonymous class for 347 // dynamic language support (JSR 292 enabled). The host class grants 348 // its access privileges to this class also. The host class is either 349 // named, or a previously loaded anonymous class. A non-anonymous class 350 // or an anonymous class loaded through normal classloading does not 351 // have this embedded field. 352 // 353 354 ValueKlassFixedBlock* _adr_valueklass_fixed_block; 355 356 friend class SystemDictionary; 357 358 public: 359 u2 loader_type() { 360 return _misc_flags & loader_type_bits(); 361 } 362 363 bool is_shared_boot_class() const { 364 return (_misc_flags & _misc_is_shared_boot_class) != 0; 365 } 366 bool is_shared_platform_class() const { 367 return (_misc_flags & _misc_is_shared_platform_class) != 0; 368 } 369 bool is_shared_app_class() const { 370 return (_misc_flags & _misc_is_shared_app_class) != 0; 371 } 372 373 void set_class_loader_type(s2 loader_type) { 374 switch (loader_type) { 375 case ClassLoader::BOOT_LOADER: 376 _misc_flags |= _misc_is_shared_boot_class; 377 break; 378 case ClassLoader::PLATFORM_LOADER: 379 _misc_flags |= _misc_is_shared_platform_class; 380 break; 381 case ClassLoader::APP_LOADER: 382 _misc_flags |= _misc_is_shared_app_class; 383 break; 384 default: 385 ShouldNotReachHere(); 386 break; 387 } 388 } 389 390 bool has_nonstatic_fields() const { 391 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 392 } 393 void set_has_nonstatic_fields(bool b) { 394 if (b) { 395 _misc_flags |= _misc_has_nonstatic_fields; 396 } else { 397 _misc_flags &= ~_misc_has_nonstatic_fields; 398 } 399 } 400 401 bool has_value_fields() const { 402 return (_extra_flags & _extra_has_value_fields) != 0; 403 } 404 void set_has_value_fields() { 405 _extra_flags |= _extra_has_value_fields; 406 } 407 408 // field sizes 409 int nonstatic_field_size() const { return _nonstatic_field_size; } 410 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 411 412 int static_field_size() const { return _static_field_size; } 413 void set_static_field_size(int size) { _static_field_size = size; } 414 415 int static_oop_field_count() const { return (int)_static_oop_field_count; } 416 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 417 418 // Java itable 419 int itable_length() const { return _itable_len; } 420 void set_itable_length(int len) { _itable_len = len; } 421 422 // array klasses 423 Klass* array_klasses() const { return _array_klasses; } 424 inline Klass* array_klasses_acquire() const; // load with acquire semantics 425 void set_array_klasses(Klass* k) { _array_klasses = k; } 426 inline void release_set_array_klasses(Klass* k); // store with release semantics 427 428 // methods 429 Array<Method*>* methods() const { return _methods; } 430 void set_methods(Array<Method*>* a) { _methods = a; } 431 Method* method_with_idnum(int idnum); 432 Method* method_with_orig_idnum(int idnum); 433 Method* method_with_orig_idnum(int idnum, int version); 434 435 // method ordering 436 Array<int>* method_ordering() const { return _method_ordering; } 437 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 438 void copy_method_ordering(const intArray* m, TRAPS); 439 440 // default_methods 441 Array<Method*>* default_methods() const { return _default_methods; } 442 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 443 444 // default method vtable_indices 445 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 446 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 447 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 448 449 // interfaces 450 Array<Klass*>* local_interfaces() const { return _local_interfaces; } 451 void set_local_interfaces(Array<Klass*>* a) { 452 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 453 _local_interfaces = a; } 454 455 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; } 456 void set_transitive_interfaces(Array<Klass*>* a) { 457 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 458 _transitive_interfaces = a; 459 } 460 461 private: 462 friend class fieldDescriptor; 463 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 464 465 public: 466 int field_offset (int index) const { return field(index)->offset(); } 467 bool field_flattened (int index) const { return field(index)->is_flatten(); } 468 int field_access_flags(int index) const { return field(index)->access_flags(); } 469 Symbol* field_name (int index) const { return field(index)->name(constants()); } 470 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 471 bool is_field_flatten (int index) const { return field(index)->is_flatten(); } 472 473 // Number of Java declared fields 474 int java_fields_count() const { return (int)_java_fields_count; } 475 476 Array<u2>* fields() const { return _fields; } 477 void set_fields(Array<u2>* f, u2 java_fields_count) { 478 guarantee(_fields == NULL || f == NULL, "Just checking"); 479 _fields = f; 480 _java_fields_count = java_fields_count; 481 } 482 483 // inner classes 484 Array<u2>* inner_classes() const { return _inner_classes; } 485 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 486 487 enum InnerClassAttributeOffset { 488 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 489 inner_class_inner_class_info_offset = 0, 490 inner_class_outer_class_info_offset = 1, 491 inner_class_inner_name_offset = 2, 492 inner_class_access_flags_offset = 3, 493 inner_class_next_offset = 4 494 }; 495 496 enum EnclosingMethodAttributeOffset { 497 enclosing_method_class_index_offset = 0, 498 enclosing_method_method_index_offset = 1, 499 enclosing_method_attribute_size = 2 500 }; 501 502 // method override check 503 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 504 505 // package 506 PackageEntry* package() const { return _package_entry; } 507 ModuleEntry* module() const; 508 bool in_unnamed_package() const { return (_package_entry == NULL); } 509 void set_package(PackageEntry* p) { _package_entry = p; } 510 void set_package(ClassLoaderData* loader_data, TRAPS); 511 bool is_same_class_package(const Klass* class2) const; 512 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const; 513 514 // find an enclosing class 515 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const; 516 517 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index. 518 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const; 519 520 private: 521 // Check prohibited package ("java/" only loadable by boot or platform loaders) 522 static void check_prohibited_package(Symbol* class_name, 523 Handle class_loader, 524 TRAPS); 525 public: 526 // tell if two classes have the same enclosing class (at package level) 527 bool is_same_package_member(const Klass* class2, TRAPS) const; 528 529 // initialization state 530 bool is_loaded() const { return _init_state >= loaded; } 531 bool is_linked() const { return _init_state >= linked; } 532 bool is_initialized() const { return _init_state == fully_initialized; } 533 bool is_not_initialized() const { return _init_state < being_initialized; } 534 bool is_being_initialized() const { return _init_state == being_initialized; } 535 bool is_in_error_state() const { return _init_state == initialization_error; } 536 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 537 ClassState init_state() { return (ClassState)_init_state; } 538 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 539 540 // defineClass specified verification 541 bool should_verify_class() const { 542 return (_misc_flags & _misc_should_verify_class) != 0; 543 } 544 void set_should_verify_class(bool value) { 545 if (value) { 546 _misc_flags |= _misc_should_verify_class; 547 } else { 548 _misc_flags &= ~_misc_should_verify_class; 549 } 550 } 551 552 // marking 553 bool is_marked_dependent() const { return _is_marked_dependent; } 554 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 555 556 static ByteSize extra_flags_offset() { return in_ByteSize(offset_of(InstanceKlass, _extra_flags)); } 557 558 // initialization (virtuals from Klass) 559 bool should_be_initialized() const; // means that initialize should be called 560 void initialize(TRAPS); 561 void link_class(TRAPS); 562 bool link_class_or_fail(TRAPS); // returns false on failure 563 void unlink_class(); 564 void rewrite_class(TRAPS); 565 void link_methods(TRAPS); 566 Method* class_initializer() const; 567 568 // set the class to initialized if no static initializer is present 569 void eager_initialize(Thread *thread); 570 571 // reference type 572 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 573 void set_reference_type(ReferenceType t) { 574 assert(t == (u1)t, "overflow"); 575 _reference_type = (u1)t; 576 } 577 578 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 579 580 // find local field, returns true if found 581 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 582 // find field in direct superinterfaces, returns the interface in which the field is defined 583 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 584 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 585 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 586 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 587 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 588 589 // find a non-static or static field given its offset within the class. 590 bool contains_field_offset(int offset) { 591 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size(), is_value()); 592 } 593 594 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 595 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 596 597 // find a local method (returns NULL if not found) 598 Method* find_method(const Symbol* name, const Symbol* signature) const; 599 static Method* find_method(const Array<Method*>* methods, 600 const Symbol* name, 601 const Symbol* signature); 602 603 // find a local method, but skip static methods 604 Method* find_instance_method(const Symbol* name, const Symbol* signature) const; 605 static Method* find_instance_method(const Array<Method*>* methods, 606 const Symbol* name, 607 const Symbol* signature); 608 609 // find a local method (returns NULL if not found) 610 Method* find_local_method(const Symbol* name, 611 const Symbol* signature, 612 OverpassLookupMode overpass_mode, 613 StaticLookupMode static_mode, 614 PrivateLookupMode private_mode) const; 615 616 // find a local method from given methods array (returns NULL if not found) 617 static Method* find_local_method(const Array<Method*>* methods, 618 const Symbol* name, 619 const Symbol* signature, 620 OverpassLookupMode overpass_mode, 621 StaticLookupMode static_mode, 622 PrivateLookupMode private_mode); 623 624 // find a local method index in methods or default_methods (returns -1 if not found) 625 static int find_method_index(const Array<Method*>* methods, 626 const Symbol* name, 627 const Symbol* signature, 628 OverpassLookupMode overpass_mode, 629 StaticLookupMode static_mode, 630 PrivateLookupMode private_mode); 631 632 // lookup operation (returns NULL if not found) 633 Method* uncached_lookup_method(const Symbol* name, 634 const Symbol* signature, 635 OverpassLookupMode overpass_mode) const; 636 637 // lookup a method in all the interfaces that this class implements 638 // (returns NULL if not found) 639 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 640 641 // lookup a method in local defaults then in all interfaces 642 // (returns NULL if not found) 643 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 644 645 // Find method indices by name. If a method with the specified name is 646 // found the index to the first method is returned, and 'end' is filled in 647 // with the index of first non-name-matching method. If no method is found 648 // -1 is returned. 649 int find_method_by_name(const Symbol* name, int* end) const; 650 static int find_method_by_name(const Array<Method*>* methods, 651 const Symbol* name, int* end); 652 653 // constant pool 654 ConstantPool* constants() const { return _constants; } 655 void set_constants(ConstantPool* c) { _constants = c; } 656 657 // protection domain 658 oop protection_domain() const; 659 660 // signers 661 objArrayOop signers() const; 662 663 // host class 664 InstanceKlass* host_klass() const { 665 InstanceKlass** hk = adr_host_klass(); 666 if (hk == NULL) { 667 assert(!is_anonymous(), "Anonymous classes have host klasses"); 668 return NULL; 669 } else { 670 assert(*hk != NULL, "host klass should always be set if the address is not null"); 671 assert(is_anonymous(), "Only anonymous classes have host klasses"); 672 return *hk; 673 } 674 } 675 void set_host_klass(const InstanceKlass* host) { 676 assert(is_anonymous(), "not anonymous"); 677 const InstanceKlass** addr = (const InstanceKlass **)adr_host_klass(); 678 assert(addr != NULL, "no reversed space"); 679 if (addr != NULL) { 680 *addr = host; 681 } 682 } 683 bool has_host_klass() const { 684 return adr_host_klass() != NULL; 685 } 686 bool is_anonymous() const { 687 return (_misc_flags & _misc_is_anonymous) != 0; 688 } 689 void set_is_anonymous(bool value) { 690 if (value) { 691 _misc_flags |= _misc_is_anonymous; 692 } else { 693 _misc_flags &= ~_misc_is_anonymous; 694 } 695 } 696 697 // Oop that keeps the metadata for this class from being unloaded 698 // in places where the metadata is stored in other places, like nmethods 699 oop klass_holder() const { 700 return is_anonymous() ? java_mirror() : class_loader(); 701 } 702 703 // Load the klass_holder as a phantom. This is useful when a weak Klass 704 // pointer has been "peeked" and then must be kept alive before it may 705 // be used safely. 706 oop klass_holder_phantom(); 707 708 bool is_contended() const { 709 return (_misc_flags & _misc_is_contended) != 0; 710 } 711 void set_is_contended(bool value) { 712 if (value) { 713 _misc_flags |= _misc_is_contended; 714 } else { 715 _misc_flags &= ~_misc_is_contended; 716 } 717 } 718 719 // source file name 720 Symbol* source_file_name() const { 721 return (_source_file_name_index == 0) ? 722 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index); 723 } 724 u2 source_file_name_index() const { 725 return _source_file_name_index; 726 } 727 void set_source_file_name_index(u2 sourcefile_index) { 728 _source_file_name_index = sourcefile_index; 729 } 730 731 // minor and major version numbers of class file 732 u2 minor_version() const { return _minor_version; } 733 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 734 u2 major_version() const { return _major_version; } 735 void set_major_version(u2 major_version) { _major_version = major_version; } 736 737 // source debug extension 738 const char* source_debug_extension() const { return _source_debug_extension; } 739 void set_source_debug_extension(const char* array, int length); 740 741 // symbol unloading support (refcount already added) 742 Symbol* array_name() { return _array_name; } 743 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; } 744 745 // nonstatic oop-map blocks 746 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 747 return oop_map_count * OopMapBlock::size_in_words(); 748 } 749 unsigned int nonstatic_oop_map_count() const { 750 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 751 } 752 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 753 void set_nonstatic_oop_map_size(int words) { 754 _nonstatic_oop_map_size = words; 755 } 756 757 #if INCLUDE_JVMTI 758 // Redefinition locking. Class can only be redefined by one thread at a time. 759 bool is_being_redefined() const { 760 return (_extra_flags & _extra_is_being_redefined); 761 } 762 void set_is_being_redefined(bool value) { 763 if (value) { 764 _extra_flags |= _extra_is_being_redefined; 765 } else { 766 _extra_flags &= ~_extra_is_being_redefined; 767 } 768 } 769 770 // RedefineClasses() support for previous versions: 771 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 772 void purge_previous_version_list(); 773 774 InstanceKlass* previous_versions() const { return _previous_versions; } 775 #else 776 InstanceKlass* previous_versions() const { return NULL; } 777 #endif 778 779 InstanceKlass* get_klass_version(int version) { 780 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 781 if (ik->constants()->version() == version) { 782 return ik; 783 } 784 } 785 return NULL; 786 } 787 788 bool has_been_redefined() const { 789 return (_misc_flags & _misc_has_been_redefined) != 0; 790 } 791 void set_has_been_redefined() { 792 _misc_flags |= _misc_has_been_redefined; 793 } 794 795 bool has_passed_fingerprint_check() const { 796 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0; 797 } 798 void set_has_passed_fingerprint_check(bool b) { 799 if (b) { 800 _misc_flags |= _misc_has_passed_fingerprint_check; 801 } else { 802 _misc_flags &= ~_misc_has_passed_fingerprint_check; 803 } 804 } 805 bool supers_have_passed_fingerprint_checks(); 806 807 static bool should_store_fingerprint(bool is_anonymous); 808 bool should_store_fingerprint() const { return should_store_fingerprint(is_anonymous()); } 809 bool has_stored_fingerprint() const; 810 uint64_t get_stored_fingerprint() const; 811 void store_fingerprint(uint64_t fingerprint); 812 813 bool is_scratch_class() const { 814 return (_misc_flags & _misc_is_scratch_class) != 0; 815 } 816 817 void set_is_scratch_class() { 818 _misc_flags |= _misc_is_scratch_class; 819 } 820 821 bool has_resolved_methods() const { 822 return (_extra_flags & _extra_has_resolved_methods) != 0; 823 } 824 825 void set_has_resolved_methods() { 826 _extra_flags |= _extra_has_resolved_methods; 827 } 828 private: 829 830 void set_kind(unsigned kind) { 831 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind"); 832 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos; 833 unsigned flags = _misc_flags & ~fmask; 834 _misc_flags = (flags | (kind << _misc_kind_field_pos)); 835 } 836 837 bool is_kind(unsigned desired) const { 838 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask; 839 return kind == desired; 840 } 841 842 public: 843 844 // Other is anything that is not one of the more specialized kinds of InstanceKlass. 845 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); } 846 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); } 847 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); } 848 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); } 849 bool is_value_type_klass() const { return is_kind(_misc_kind_value_type); } 850 851 #if INCLUDE_JVMTI 852 853 void init_previous_versions() { 854 _previous_versions = NULL; 855 } 856 857 private: 858 static bool _has_previous_versions; 859 public: 860 static void purge_previous_versions(InstanceKlass* ik) { 861 if (ik->has_been_redefined()) { 862 ik->purge_previous_version_list(); 863 } 864 } 865 866 static bool has_previous_versions_and_reset(); 867 868 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 869 void set_cached_class_file(JvmtiCachedClassFileData *data) { 870 _cached_class_file = data; 871 } 872 JvmtiCachedClassFileData * get_cached_class_file(); 873 jint get_cached_class_file_len(); 874 unsigned char * get_cached_class_file_bytes(); 875 876 // JVMTI: Support for caching of field indices, types, and offsets 877 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 878 _jvmti_cached_class_field_map = descriptor; 879 } 880 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 881 return _jvmti_cached_class_field_map; 882 } 883 884 #if INCLUDE_CDS 885 void set_archived_class_data(JvmtiCachedClassFileData* data) { 886 _cached_class_file = data; 887 } 888 889 JvmtiCachedClassFileData * get_archived_class_data(); 890 #endif // INCLUDE_CDS 891 #else // INCLUDE_JVMTI 892 893 static void purge_previous_versions(InstanceKlass* ik) { return; }; 894 static bool has_previous_versions_and_reset() { return false; } 895 896 void set_cached_class_file(JvmtiCachedClassFileData *data) { 897 assert(data == NULL, "unexpected call with JVMTI disabled"); 898 } 899 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; } 900 901 #endif // INCLUDE_JVMTI 902 903 bool has_nonstatic_concrete_methods() const { 904 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0; 905 } 906 void set_has_nonstatic_concrete_methods(bool b) { 907 if (b) { 908 _misc_flags |= _misc_has_nonstatic_concrete_methods; 909 } else { 910 _misc_flags &= ~_misc_has_nonstatic_concrete_methods; 911 } 912 } 913 914 bool declares_nonstatic_concrete_methods() const { 915 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0; 916 } 917 void set_declares_nonstatic_concrete_methods(bool b) { 918 if (b) { 919 _misc_flags |= _misc_declares_nonstatic_concrete_methods; 920 } else { 921 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods; 922 } 923 } 924 925 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 926 inline u2 next_method_idnum(); 927 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 928 929 // generics support 930 Symbol* generic_signature() const { 931 return (_generic_signature_index == 0) ? 932 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index); 933 } 934 u2 generic_signature_index() const { 935 return _generic_signature_index; 936 } 937 void set_generic_signature_index(u2 sig_index) { 938 _generic_signature_index = sig_index; 939 } 940 941 u2 enclosing_method_data(int offset) const; 942 u2 enclosing_method_class_index() const { 943 return enclosing_method_data(enclosing_method_class_index_offset); 944 } 945 u2 enclosing_method_method_index() { 946 return enclosing_method_data(enclosing_method_method_index_offset); 947 } 948 void set_enclosing_method_indices(u2 class_index, 949 u2 method_index); 950 951 // jmethodID support 952 jmethodID get_jmethod_id(const methodHandle& method_h); 953 jmethodID get_jmethod_id_fetch_or_update(size_t idnum, 954 jmethodID new_id, jmethodID* new_jmeths, 955 jmethodID* to_dealloc_id_p, 956 jmethodID** to_dealloc_jmeths_p); 957 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 958 size_t *length_p, jmethodID* id_p); 959 void ensure_space_for_methodids(int start_offset = 0); 960 jmethodID jmethod_id_or_null(Method* method); 961 962 // annotations support 963 Annotations* annotations() const { return _annotations; } 964 void set_annotations(Annotations* anno) { _annotations = anno; } 965 966 AnnotationArray* class_annotations() const { 967 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 968 } 969 Array<AnnotationArray*>* fields_annotations() const { 970 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 971 } 972 AnnotationArray* class_type_annotations() const { 973 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 974 } 975 Array<AnnotationArray*>* fields_type_annotations() const { 976 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 977 } 978 // allocation 979 instanceOop allocate_instance(TRAPS); 980 981 // additional member function to return a handle 982 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } 983 984 objArrayOop allocate_objArray(int n, int length, TRAPS); 985 // Helper function 986 static instanceOop register_finalizer(instanceOop i, TRAPS); 987 988 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 989 // if not, throw either an Error or an Exception. 990 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 991 992 // initialization 993 void call_class_initializer(TRAPS); 994 void set_initialization_state_and_notify(ClassState state, TRAPS); 995 996 // OopMapCache support 997 OopMapCache* oop_map_cache() { return _oop_map_cache; } 998 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 999 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 1000 1001 // JNI identifier support (for static fields - for jni performance) 1002 JNIid* jni_ids() { return _jni_ids; } 1003 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 1004 JNIid* jni_id_for(int offset); 1005 1006 // maintenance of deoptimization dependencies 1007 inline DependencyContext dependencies(); 1008 int mark_dependent_nmethods(KlassDepChange& changes); 1009 void add_dependent_nmethod(nmethod* nm); 1010 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately); 1011 1012 // On-stack replacement support 1013 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 1014 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 1015 void add_osr_nmethod(nmethod* n); 1016 bool remove_osr_nmethod(nmethod* n); 1017 int mark_osr_nmethods(const Method* m); 1018 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 1019 1020 #if INCLUDE_JVMTI 1021 // Breakpoint support (see methods on Method* for details) 1022 BreakpointInfo* breakpoints() const { return _breakpoints; }; 1023 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 1024 #endif 1025 1026 // support for stub routines 1027 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 1028 TRACE_DEFINE_KLASS_TRACE_ID_OFFSET; 1029 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 1030 1031 // subclass/subinterface checks 1032 bool implements_interface(Klass* k) const; 1033 bool is_same_or_direct_interface(Klass* k) const; 1034 1035 #ifdef ASSERT 1036 // check whether this class or one of its superclasses was redefined 1037 bool has_redefined_this_or_super() const; 1038 #endif 1039 1040 // Access to the implementor of an interface. 1041 Klass* implementor() const 1042 { 1043 Klass** k = adr_implementor(); 1044 if (k == NULL) { 1045 return NULL; 1046 } else { 1047 return *k; 1048 } 1049 } 1050 1051 void set_implementor(Klass* k) { 1052 assert(is_interface(), "not interface"); 1053 Klass** addr = adr_implementor(); 1054 assert(addr != NULL, "null addr"); 1055 if (addr != NULL) { 1056 *addr = k; 1057 } 1058 } 1059 1060 int nof_implementors() const { 1061 Klass* k = implementor(); 1062 if (k == NULL) { 1063 return 0; 1064 } else if (k != this) { 1065 return 1; 1066 } else { 1067 return 2; 1068 } 1069 } 1070 1071 void add_implementor(Klass* k); // k is a new class that implements this interface 1072 void init_implementor(); // initialize 1073 1074 // link this class into the implementors list of every interface it implements 1075 void process_interfaces(Thread *thread); 1076 1077 // virtual operations from Klass 1078 bool is_leaf_class() const { return _subklass == NULL; } 1079 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); 1080 bool compute_is_subtype_of(Klass* k); 1081 bool can_be_primary_super_slow() const; 1082 int oop_size(oop obj) const { return size_helper(); } 1083 // slow because it's a virtual call and used for verifying the layout_helper. 1084 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 1085 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 1086 1087 // Iterators 1088 void do_local_static_fields(FieldClosure* cl); 1089 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 1090 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 1091 1092 void methods_do(void f(Method* method)); 1093 void array_klasses_do(void f(Klass* k)); 1094 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 1095 bool super_types_do(SuperTypeClosure* blk); 1096 1097 static InstanceKlass* cast(Klass* k) { 1098 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 1099 } 1100 1101 static const InstanceKlass* cast(const Klass* k) { 1102 assert(k != NULL, "k should not be null"); 1103 assert(k->is_instance_klass(), "cast to InstanceKlass"); 1104 return static_cast<const InstanceKlass*>(k); 1105 } 1106 1107 InstanceKlass* java_super() const { 1108 return (super() == NULL) ? NULL : cast(super()); 1109 } 1110 1111 // Sizing (in words) 1112 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 1113 1114 static int size(int vtable_length, int itable_length, 1115 int nonstatic_oop_map_size, 1116 bool is_interface, bool is_anonymous, bool has_stored_fingerprint, 1117 int java_fields, bool is_value_type) { 1118 return align_metadata_size(header_size() + 1119 vtable_length + 1120 itable_length + 1121 nonstatic_oop_map_size + 1122 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) + 1123 (is_anonymous ? (int)sizeof(Klass*)/wordSize : 0) + 1124 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0) + 1125 (java_fields * (int)sizeof(Klass*)/wordSize) + 1126 (is_value_type ? (int)sizeof(struct ValueKlassFixedBlock) : 0)); 1127 } 1128 int size() const { return size(vtable_length(), 1129 itable_length(), 1130 nonstatic_oop_map_size(), 1131 is_interface(), 1132 is_anonymous(), 1133 has_stored_fingerprint(), 1134 has_value_fields() ? java_fields_count() : 0, 1135 is_value()); 1136 } 1137 #if INCLUDE_SERVICES 1138 virtual void collect_statistics(KlassSizeStats *sz) const; 1139 #endif 1140 1141 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); } 1142 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 1143 1144 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 1145 1146 address static_field_addr(int offset); 1147 1148 bool bounds_check(address addr, bool edge_ok = false, intptr_t size_in_bytes = -1) const PRODUCT_RETURN0; 1149 1150 OopMapBlock* start_of_nonstatic_oop_maps() const { 1151 return (OopMapBlock*)(start_of_itable() + itable_length()); 1152 } 1153 1154 Klass** end_of_nonstatic_oop_maps() const { 1155 return (Klass**)(start_of_nonstatic_oop_maps() + 1156 nonstatic_oop_map_count()); 1157 } 1158 1159 Klass** adr_implementor() const { 1160 if (is_interface()) { 1161 return (Klass**)end_of_nonstatic_oop_maps(); 1162 } else { 1163 return NULL; 1164 } 1165 }; 1166 1167 InstanceKlass** adr_host_klass() const { 1168 if (is_anonymous()) { 1169 InstanceKlass** adr_impl = (InstanceKlass **)adr_implementor(); 1170 if (adr_impl != NULL) { 1171 return adr_impl + 1; 1172 } else { 1173 return (InstanceKlass **)end_of_nonstatic_oop_maps(); 1174 } 1175 } else { 1176 return NULL; 1177 } 1178 } 1179 1180 address adr_fingerprint() const { 1181 if (has_stored_fingerprint()) { 1182 InstanceKlass** adr_host = adr_host_klass(); 1183 if (adr_host != NULL) { 1184 return (address)(adr_host + 1); 1185 } 1186 1187 Klass** adr_impl = adr_implementor(); 1188 if (adr_impl != NULL) { 1189 return (address)(adr_impl + 1); 1190 } 1191 1192 return (address)end_of_nonstatic_oop_maps(); 1193 } else { 1194 return NULL; 1195 } 1196 } 1197 1198 address adr_value_fields_klasses() const { 1199 if (has_value_fields()) { 1200 address adr_fing = adr_fingerprint(); 1201 if (adr_fing != NULL) { 1202 return adr_fingerprint() + sizeof(u8); 1203 } 1204 1205 InstanceKlass** adr_host = adr_host_klass(); 1206 if (adr_host != NULL) { 1207 return (address)(adr_host + 1); 1208 } 1209 1210 Klass** adr_impl = adr_implementor(); 1211 if (adr_impl != NULL) { 1212 return (address)(adr_impl + 1); 1213 } 1214 1215 return (address)end_of_nonstatic_oop_maps(); 1216 } else { 1217 return NULL; 1218 } 1219 } 1220 1221 Klass* get_value_field_klass(int idx) const { 1222 assert(has_value_fields(), "Sanity checking"); 1223 Klass* k = ((Klass**)adr_value_fields_klasses())[idx]; 1224 assert(k != NULL, "Should always be set before being read"); 1225 assert(k->is_value(), "Must be a value type"); 1226 return k; 1227 } 1228 1229 Klass* get_value_field_klass_or_null(int idx) const { 1230 assert(has_value_fields(), "Sanity checking"); 1231 Klass* k = ((Klass**)adr_value_fields_klasses())[idx]; 1232 assert(k == NULL || k->is_value(), "Must be a value type"); 1233 return k; 1234 } 1235 1236 void set_value_field_klass(int idx, Klass* k) { 1237 assert(has_value_fields(), "Sanity checking"); 1238 assert(k != NULL, "Should not be set to NULL"); 1239 assert(((Klass**)adr_value_fields_klasses())[idx] == NULL, "Should not be set twice"); 1240 ((Klass**)adr_value_fields_klasses())[idx] = k; 1241 } 1242 1243 // Use this to return the size of an instance in heap words: 1244 virtual int size_helper() const { 1245 return layout_helper_to_size_helper(layout_helper()); 1246 } 1247 1248 // This bit is initialized in classFileParser.cpp. 1249 // It is false under any of the following conditions: 1250 // - the class is abstract (including any interface) 1251 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1252 // - the class size is larger than FastAllocateSizeLimit 1253 // - the class is java/lang/Class, which cannot be allocated directly 1254 bool can_be_fastpath_allocated() const { 1255 return !layout_helper_needs_slow_path(layout_helper()); 1256 } 1257 1258 // Java itable 1259 klassItable itable() const; // return klassItable wrapper 1260 Method* method_at_itable(Klass* holder, int index, TRAPS); 1261 1262 #if INCLUDE_JVMTI 1263 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed); 1264 #endif // INCLUDE_JVMTI 1265 1266 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive); 1267 void clean_implementors_list(BoolObjectClosure* is_alive); 1268 void clean_method_data(BoolObjectClosure* is_alive); 1269 1270 // Explicit metaspace deallocation of fields 1271 // For RedefineClasses and class file parsing errors, we need to deallocate 1272 // instanceKlasses and the metadata they point to. 1273 void deallocate_contents(ClassLoaderData* loader_data); 1274 static void deallocate_methods(ClassLoaderData* loader_data, 1275 Array<Method*>* methods); 1276 void static deallocate_interfaces(ClassLoaderData* loader_data, 1277 const Klass* super_klass, 1278 Array<Klass*>* local_interfaces, 1279 Array<Klass*>* transitive_interfaces); 1280 1281 // The constant pool is on stack if any of the methods are executing or 1282 // referenced by handles. 1283 bool on_stack() const { return _constants->on_stack(); } 1284 1285 // callbacks for actions during class unloading 1286 static void notify_unload_class(InstanceKlass* ik); 1287 static void release_C_heap_structures(InstanceKlass* ik); 1288 1289 // Naming 1290 const char* signature_name() const; 1291 static Symbol* package_from_name(const Symbol* name, TRAPS); 1292 1293 // GC specific object visitors 1294 // 1295 #if INCLUDE_ALL_GCS 1296 // Parallel Scavenge 1297 void oop_ps_push_contents( oop obj, PSPromotionManager* pm); 1298 // Parallel Compact 1299 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm); 1300 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm); 1301 #endif 1302 1303 // Oop fields (and metadata) iterators 1304 // [nv = true] Use non-virtual calls to do_oop_nv. 1305 // [nv = false] Use virtual calls to do_oop. 1306 // 1307 // The InstanceKlass iterators also visits the Object's klass. 1308 1309 // Forward iteration 1310 public: 1311 // Iterate over all oop fields in the oop maps. 1312 template <bool nv, class OopClosureType> 1313 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1314 1315 protected: 1316 // Iterate over all oop fields and metadata. 1317 template <bool nv, class OopClosureType> 1318 inline int oop_oop_iterate(oop obj, OopClosureType* closure); 1319 1320 private: 1321 // Iterate over all oop fields in the oop maps. 1322 // Specialized for [T = oop] or [T = narrowOop]. 1323 template <bool nv, typename T, class OopClosureType> 1324 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure); 1325 1326 // Iterate over all oop fields in one oop map. 1327 template <bool nv, typename T, class OopClosureType> 1328 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1329 1330 1331 // Reverse iteration 1332 #if INCLUDE_ALL_GCS 1333 public: 1334 // Iterate over all oop fields in the oop maps. 1335 template <bool nv, class OopClosureType> 1336 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1337 1338 protected: 1339 // Iterate over all oop fields and metadata. 1340 template <bool nv, class OopClosureType> 1341 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1342 1343 private: 1344 // Iterate over all oop fields in the oop maps. 1345 // Specialized for [T = oop] or [T = narrowOop]. 1346 template <bool nv, typename T, class OopClosureType> 1347 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure); 1348 1349 // Iterate over all oop fields in one oop map. 1350 template <bool nv, typename T, class OopClosureType> 1351 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1352 #endif 1353 1354 1355 // Bounded range iteration 1356 public: 1357 // Iterate over all oop fields in the oop maps. 1358 template <bool nv, class OopClosureType> 1359 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1360 1361 protected: 1362 // Iterate over all oop fields and metadata. 1363 template <bool nv, class OopClosureType> 1364 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1365 1366 private: 1367 // Iterate over all oop fields in the oop maps. 1368 // Specialized for [T = oop] or [T = narrowOop]. 1369 template <bool nv, typename T, class OopClosureType> 1370 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1371 1372 // Iterate over all oop fields in one oop map. 1373 template <bool nv, typename T, class OopClosureType> 1374 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1375 1376 1377 public: 1378 1379 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL) 1380 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL) 1381 1382 #if INCLUDE_ALL_GCS 1383 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS) 1384 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS) 1385 #endif // INCLUDE_ALL_GCS 1386 1387 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1388 1389 public: 1390 void set_in_error_state() { 1391 assert(DumpSharedSpaces, "only call this when dumping archive"); 1392 _init_state = initialization_error; 1393 } 1394 bool check_sharing_error_state(); 1395 1396 private: 1397 // initialization state 1398 #ifdef ASSERT 1399 void set_init_state(ClassState state); 1400 #else 1401 void set_init_state(ClassState state) { _init_state = (u1)state; } 1402 #endif 1403 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1404 void set_init_thread(Thread *thread) { _init_thread = thread; } 1405 1406 // The RedefineClasses() API can cause new method idnums to be needed 1407 // which will cause the caches to grow. Safety requires different 1408 // cache management logic if the caches can grow instead of just 1409 // going from NULL to non-NULL. 1410 bool idnum_can_increment() const { return has_been_redefined(); } 1411 inline jmethodID* methods_jmethod_ids_acquire() const; 1412 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1413 1414 // Lock during initialization 1415 public: 1416 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1417 // Must be one per class and it has to be a VM internal object so java code 1418 // cannot lock it (like the mirror). 1419 // It has to be an object not a Mutex because it's held through java calls. 1420 oop init_lock() const; 1421 private: 1422 void fence_and_clear_init_lock(); 1423 1424 bool link_class_impl (bool throw_verifyerror, TRAPS); 1425 bool verify_code (bool throw_verifyerror, TRAPS); 1426 void initialize_impl (TRAPS); 1427 void initialize_super_interfaces (TRAPS); 1428 void eager_initialize_impl (); 1429 /* jni_id_for_impl for jfieldID only */ 1430 JNIid* jni_id_for_impl (int offset); 1431 protected: 1432 // Returns the array class for the n'th dimension 1433 virtual Klass* array_klass_impl(bool or_null, int n, TRAPS); 1434 1435 // Returns the array class with this class as element type 1436 virtual Klass* array_klass_impl(bool or_null, TRAPS); 1437 1438 private: 1439 1440 // find a local method (returns NULL if not found) 1441 Method* find_method_impl(const Symbol* name, 1442 const Symbol* signature, 1443 OverpassLookupMode overpass_mode, 1444 StaticLookupMode static_mode, 1445 PrivateLookupMode private_mode) const; 1446 1447 static Method* find_method_impl(const Array<Method*>* methods, 1448 const Symbol* name, 1449 const Symbol* signature, 1450 OverpassLookupMode overpass_mode, 1451 StaticLookupMode static_mode, 1452 PrivateLookupMode private_mode); 1453 1454 // Free CHeap allocated fields. 1455 void release_C_heap_structures(); 1456 1457 #if INCLUDE_JVMTI 1458 // RedefineClasses support 1459 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1460 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1461 #endif 1462 public: 1463 // CDS support - remove and restore oops from metadata. Oops are not shared. 1464 virtual void remove_unshareable_info(); 1465 virtual void remove_java_mirror(); 1466 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 1467 1468 // jvm support 1469 jint compute_modifier_flags(TRAPS) const; 1470 1471 public: 1472 // JVMTI support 1473 jint jvmti_class_status() const; 1474 1475 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 1476 1477 public: 1478 // Printing 1479 #ifndef PRODUCT 1480 void print_on(outputStream* st) const; 1481 #endif 1482 void print_value_on(outputStream* st) const; 1483 1484 void oop_print_value_on(oop obj, outputStream* st); 1485 1486 #ifndef PRODUCT 1487 void oop_print_on (oop obj, outputStream* st); 1488 1489 void print_dependent_nmethods(bool verbose = false); 1490 bool is_dependent_nmethod(nmethod* nm); 1491 #endif 1492 1493 const char* internal_name() const; 1494 1495 // Verification 1496 void verify_on(outputStream* st); 1497 1498 void oop_verify_on(oop obj, outputStream* st); 1499 1500 // Logging 1501 void print_class_load_logging(ClassLoaderData* loader_data, 1502 const char* module_name, 1503 const ClassFileStream* cfs) const; 1504 }; 1505 1506 // for adding methods 1507 // UNSET_IDNUM return means no more ids available 1508 inline u2 InstanceKlass::next_method_idnum() { 1509 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1510 return ConstMethod::UNSET_IDNUM; // no more ids available 1511 } else { 1512 return _idnum_allocated_count++; 1513 } 1514 } 1515 1516 1517 /* JNIid class for jfieldIDs only */ 1518 class JNIid: public CHeapObj<mtClass> { 1519 friend class VMStructs; 1520 private: 1521 Klass* _holder; 1522 JNIid* _next; 1523 int _offset; 1524 #ifdef ASSERT 1525 bool _is_static_field_id; 1526 #endif 1527 1528 public: 1529 // Accessors 1530 Klass* holder() const { return _holder; } 1531 int offset() const { return _offset; } 1532 JNIid* next() { return _next; } 1533 // Constructor 1534 JNIid(Klass* holder, int offset, JNIid* next); 1535 // Identifier lookup 1536 JNIid* find(int offset); 1537 1538 bool find_local_field(fieldDescriptor* fd) { 1539 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1540 } 1541 1542 static void deallocate(JNIid* id); 1543 // Debugging 1544 #ifdef ASSERT 1545 bool is_static_field_id() const { return _is_static_field_id; } 1546 void set_is_static_field_id() { _is_static_field_id = true; } 1547 #endif 1548 void verify(Klass* holder); 1549 }; 1550 1551 // An iterator that's used to access the inner classes indices in the 1552 // InstanceKlass::_inner_classes array. 1553 class InnerClassesIterator : public StackObj { 1554 private: 1555 Array<jushort>* _inner_classes; 1556 int _length; 1557 int _idx; 1558 public: 1559 1560 InnerClassesIterator(const InstanceKlass* k) { 1561 _inner_classes = k->inner_classes(); 1562 if (k->inner_classes() != NULL) { 1563 _length = _inner_classes->length(); 1564 // The inner class array's length should be the multiple of 1565 // inner_class_next_offset if it only contains the InnerClasses 1566 // attribute data, or it should be 1567 // n*inner_class_next_offset+enclosing_method_attribute_size 1568 // if it also contains the EnclosingMethod data. 1569 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1570 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1571 "just checking"); 1572 // Remove the enclosing_method portion if exists. 1573 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1574 _length -= InstanceKlass::enclosing_method_attribute_size; 1575 } 1576 } else { 1577 _length = 0; 1578 } 1579 _idx = 0; 1580 } 1581 1582 int length() const { 1583 return _length; 1584 } 1585 1586 void next() { 1587 _idx += InstanceKlass::inner_class_next_offset; 1588 } 1589 1590 bool done() const { 1591 return (_idx >= _length); 1592 } 1593 1594 u2 inner_class_info_index() const { 1595 return _inner_classes->at( 1596 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1597 } 1598 1599 void set_inner_class_info_index(u2 index) { 1600 _inner_classes->at_put( 1601 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1602 } 1603 1604 u2 outer_class_info_index() const { 1605 return _inner_classes->at( 1606 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1607 } 1608 1609 void set_outer_class_info_index(u2 index) { 1610 _inner_classes->at_put( 1611 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1612 } 1613 1614 u2 inner_name_index() const { 1615 return _inner_classes->at( 1616 _idx + InstanceKlass::inner_class_inner_name_offset); 1617 } 1618 1619 void set_inner_name_index(u2 index) { 1620 _inner_classes->at_put( 1621 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1622 } 1623 1624 u2 inner_access_flags() const { 1625 return _inner_classes->at( 1626 _idx + InstanceKlass::inner_class_access_flags_offset); 1627 } 1628 }; 1629 1630 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP