1 /* 2 * Copyright (c) 1997, 2018, 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 "memory/referenceType.hpp" 33 #include "oops/annotations.hpp" 34 #include "oops/constMethod.hpp" 35 #include "oops/fieldInfo.hpp" 36 #include "oops/instanceOop.hpp" 37 #include "oops/klassVtable.hpp" 38 #include "runtime/handles.hpp" 39 #include "runtime/os.hpp" 40 #include "utilities/accessFlags.hpp" 41 #include "utilities/align.hpp" 42 #include "utilities/macros.hpp" 43 #if INCLUDE_JFR 44 #include "jfr/support/jfrKlassExtension.hpp" 45 #endif 46 47 48 // An InstanceKlass is the VM level representation of a Java class. 49 // It contains all information needed for at class at execution runtime. 50 51 // InstanceKlass embedded field layout (after declared fields): 52 // [EMBEDDED Java vtable ] size in words = vtable_len 53 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size 54 // The embedded nonstatic oop-map blocks are short pairs (offset, length) 55 // indicating where oops are located in instances of this klass. 56 // [EMBEDDED implementor of the interface] only exist for interface 57 // [EMBEDDED unsafe_anonymous_host klass] only exist for an unsafe anonymous class (JSR 292 enabled) 58 // [EMBEDDED fingerprint ] only if should_store_fingerprint()==true 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 nmethodBucket; 73 class SuperTypeClosure; 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 // Describes where oops are located in instances of this klass. 94 class OopMapBlock { 95 public: 96 // Byte offset of the first oop mapped by this block. 97 int offset() const { return _offset; } 98 void set_offset(int offset) { _offset = offset; } 99 100 // Number of oops in this block. 101 uint count() const { return _count; } 102 void set_count(uint count) { _count = count; } 103 104 // sizeof(OopMapBlock) in words. 105 static const int size_in_words() { 106 return align_up((int)sizeof(OopMapBlock), wordSize) >> 107 LogBytesPerWord; 108 } 109 110 private: 111 int _offset; 112 uint _count; 113 }; 114 115 struct JvmtiCachedClassFileData; 116 117 class InstanceKlass: public Klass { 118 friend class VMStructs; 119 friend class JVMCIVMStructs; 120 friend class ClassFileParser; 121 friend class CompileReplay; 122 123 public: 124 static const KlassID ID = InstanceKlassID; 125 126 protected: 127 InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id = ID); 128 129 public: 130 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } 131 132 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 133 // of the class loading & initialization procedure, and the use of the states. 134 enum ClassState { 135 allocated, // allocated (but not yet linked) 136 loaded, // loaded and inserted in class hierarchy (but not linked yet) 137 linked, // successfully linked/verified (but not initialized yet) 138 being_initialized, // currently running class initializer 139 fully_initialized, // initialized (successfull final state) 140 initialization_error // error happened during initialization 141 }; 142 143 private: 144 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS); 145 146 protected: 147 // If you add a new field that points to any metaspace object, you 148 // must add this field to InstanceKlass::metaspace_pointers_do(). 149 150 // Annotations for this class 151 Annotations* _annotations; 152 // Package this class is defined in 153 PackageEntry* _package_entry; 154 // Array classes holding elements of this class. 155 Klass* volatile _array_klasses; 156 // Constant pool for this class. 157 ConstantPool* _constants; 158 // The InnerClasses attribute and EnclosingMethod attribute. The 159 // _inner_classes is an array of shorts. If the class has InnerClasses 160 // attribute, then the _inner_classes array begins with 4-tuples of shorts 161 // [inner_class_info_index, outer_class_info_index, 162 // inner_name_index, inner_class_access_flags] for the InnerClasses 163 // attribute. If the EnclosingMethod attribute exists, it occupies the 164 // last two shorts [class_index, method_index] of the array. If only 165 // the InnerClasses attribute exists, the _inner_classes array length is 166 // number_of_inner_classes * 4. If the class has both InnerClasses 167 // and EnclosingMethod attributes the _inner_classes array length is 168 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 169 Array<jushort>* _inner_classes; 170 171 // The NestMembers attribute. An array of shorts, where each is a 172 // class info index for the class that is a nest member. This data 173 // has not been validated. 174 Array<jushort>* _nest_members; 175 176 // The NestHost attribute. The class info index for the class 177 // that is the nest-host of this class. This data has not been validated. 178 jushort _nest_host_index; 179 180 // Resolved nest-host klass: either true nest-host or self if we are not nested. 181 // By always being set it makes nest-member access checks simpler. 182 InstanceKlass* _nest_host; 183 184 // the source debug extension for this klass, NULL if not specified. 185 // Specified as UTF-8 string without terminating zero byte in the classfile, 186 // it is stored in the instanceklass as a NULL-terminated UTF-8 string 187 const char* _source_debug_extension; 188 // Array name derived from this class which needs unreferencing 189 // if this class is unloaded. 190 Symbol* _array_name; 191 192 // Number of heapOopSize words used by non-static fields in this klass 193 // (including inherited fields but after header_size()). 194 int _nonstatic_field_size; 195 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 196 // Constant pool index to the utf8 entry of the Generic signature, 197 // or 0 if none. 198 u2 _generic_signature_index; 199 // Constant pool index to the utf8 entry for the name of source file 200 // containing this klass, 0 if not specified. 201 u2 _source_file_name_index; 202 u2 _static_oop_field_count;// number of static oop fields in this klass 203 u2 _java_fields_count; // The number of declared Java fields 204 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 205 206 int _itable_len; // length of Java itable (in words) 207 // _is_marked_dependent can be set concurrently, thus cannot be part of the 208 // _misc_flags. 209 bool _is_marked_dependent; // used for marking during flushing and deoptimization 210 bool _is_being_redefined; // used for locking redefinition 211 212 // The low two bits of _misc_flags contains the kind field. 213 // This can be used to quickly discriminate among the four kinds of 214 // InstanceKlass. 215 216 static const unsigned _misc_kind_field_size = 2; 217 static const unsigned _misc_kind_field_pos = 0; 218 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u; 219 220 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass 221 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass 222 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass 223 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass 224 225 // Start after _misc_kind field. 226 enum { 227 _misc_rewritten = 1 << 2, // methods rewritten. 228 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops 229 _misc_should_verify_class = 1 << 4, // allow caching of preverification 230 _misc_is_unsafe_anonymous = 1 << 5, // has embedded _unsafe_anonymous_host field 231 _misc_is_contended = 1 << 6, // marked with contended annotation 232 _misc_has_nonstatic_concrete_methods = 1 << 7, // class/superclass/implemented interfaces has non-static, concrete methods 233 _misc_declares_nonstatic_concrete_methods = 1 << 8, // directly declares non-static, concrete methods 234 _misc_has_been_redefined = 1 << 9, // class has been redefined 235 _misc_has_passed_fingerprint_check = 1 << 10, // when this class was loaded, the fingerprint computed from its 236 // code source was found to be matching the value recorded by AOT. 237 _misc_is_scratch_class = 1 << 11, // class is the redefined scratch class 238 _misc_is_shared_boot_class = 1 << 12, // defining class loader is boot class loader 239 _misc_is_shared_platform_class = 1 << 13, // defining class loader is platform class loader 240 _misc_is_shared_app_class = 1 << 14, // defining class loader is app class loader 241 _misc_has_resolved_methods = 1 << 15 // resolved methods table entries added for this class 242 }; 243 u2 loader_type_bits() { 244 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class; 245 } 246 u2 _misc_flags; 247 u2 _minor_version; // minor version number of class file 248 u2 _major_version; // major version number of class file 249 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) 250 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 251 JNIid* _jni_ids; // First JNI identifier for static fields in this class 252 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 253 nmethodBucket* volatile _dep_context; // packed DependencyContext structure 254 uint64_t volatile _dep_context_last_cleaned; 255 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 256 #if INCLUDE_JVMTI 257 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 258 // Linked instanceKlasses of previous versions 259 InstanceKlass* _previous_versions; 260 // JVMTI fields can be moved to their own structure - see 6315920 261 // JVMTI: cached class file, before retransformable agent modified it in CFLH 262 JvmtiCachedClassFileData* _cached_class_file; 263 #endif 264 265 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 266 267 // Class states are defined as ClassState (see above). 268 // Place the _init_state here to utilize the unused 2-byte after 269 // _idnum_allocated_count. 270 u1 _init_state; // state of class 271 u1 _reference_type; // reference type 272 273 u2 _this_class_index; // constant pool entry 274 #if INCLUDE_JVMTI 275 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 276 #endif 277 278 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 279 280 // Method array. 281 Array<Method*>* _methods; 282 // Default Method Array, concrete methods inherited from interfaces 283 Array<Method*>* _default_methods; 284 // Interfaces (InstanceKlass*s) this class declares locally to implement. 285 Array<InstanceKlass*>* _local_interfaces; 286 // Interfaces (InstanceKlass*s) this class implements transitively. 287 Array<InstanceKlass*>* _transitive_interfaces; 288 // Int array containing the original order of method in the class file (for JVMTI). 289 Array<int>* _method_ordering; 290 // Int array containing the vtable_indices for default_methods 291 // offset matches _default_methods offset 292 Array<int>* _default_vtable_indices; 293 294 // Instance and static variable information, starts with 6-tuples of shorts 295 // [access, name index, sig index, initval index, low_offset, high_offset] 296 // for all fields, followed by the generic signature data at the end of 297 // the array. Only fields with generic signature attributes have the generic 298 // signature data set in the array. The fields array looks like following: 299 // 300 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 301 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 302 // ... 303 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 304 // [generic signature index] 305 // [generic signature index] 306 // ... 307 Array<u2>* _fields; 308 309 // embedded Java vtable follows here 310 // embedded Java itables follows here 311 // embedded static fields follows here 312 // embedded nonstatic oop-map blocks follows here 313 // embedded implementor of this interface follows here 314 // The embedded implementor only exists if the current klass is an 315 // iterface. The possible values of the implementor fall into following 316 // three cases: 317 // NULL: no implementor. 318 // A Klass* that's not itself: one implementor. 319 // Itself: more than one implementors. 320 // embedded unsafe_anonymous_host klass follows here 321 // The embedded host klass only exists in an unsafe anonymous class for 322 // dynamic language support (JSR 292 enabled). The host class grants 323 // its access privileges to this class also. The host class is either 324 // named, or a previously loaded unsafe anonymous class. A non-anonymous class 325 // or an anonymous class loaded through normal classloading does not 326 // have this embedded field. 327 // 328 329 friend class SystemDictionary; 330 331 public: 332 u2 loader_type() { 333 return _misc_flags & loader_type_bits(); 334 } 335 336 bool is_shared_boot_class() const { 337 return (_misc_flags & _misc_is_shared_boot_class) != 0; 338 } 339 bool is_shared_platform_class() const { 340 return (_misc_flags & _misc_is_shared_platform_class) != 0; 341 } 342 bool is_shared_app_class() const { 343 return (_misc_flags & _misc_is_shared_app_class) != 0; 344 } 345 346 void clear_class_loader_type() { 347 _misc_flags &= ~loader_type_bits(); 348 } 349 350 void set_class_loader_type(s2 loader_type) { 351 switch (loader_type) { 352 case ClassLoader::BOOT_LOADER: 353 _misc_flags |= _misc_is_shared_boot_class; 354 break; 355 case ClassLoader::PLATFORM_LOADER: 356 _misc_flags |= _misc_is_shared_platform_class; 357 break; 358 case ClassLoader::APP_LOADER: 359 _misc_flags |= _misc_is_shared_app_class; 360 break; 361 default: 362 ShouldNotReachHere(); 363 break; 364 } 365 } 366 367 bool has_nonstatic_fields() const { 368 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 369 } 370 void set_has_nonstatic_fields(bool b) { 371 if (b) { 372 _misc_flags |= _misc_has_nonstatic_fields; 373 } else { 374 _misc_flags &= ~_misc_has_nonstatic_fields; 375 } 376 } 377 378 // field sizes 379 int nonstatic_field_size() const { return _nonstatic_field_size; } 380 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 381 382 int static_field_size() const { return _static_field_size; } 383 void set_static_field_size(int size) { _static_field_size = size; } 384 385 int static_oop_field_count() const { return (int)_static_oop_field_count; } 386 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 387 388 // Java itable 389 int itable_length() const { return _itable_len; } 390 void set_itable_length(int len) { _itable_len = len; } 391 392 // array klasses 393 Klass* array_klasses() const { return _array_klasses; } 394 inline Klass* array_klasses_acquire() const; // load with acquire semantics 395 void set_array_klasses(Klass* k) { _array_klasses = k; } 396 inline void release_set_array_klasses(Klass* k); // store with release semantics 397 398 // methods 399 Array<Method*>* methods() const { return _methods; } 400 void set_methods(Array<Method*>* a) { _methods = a; } 401 Method* method_with_idnum(int idnum); 402 Method* method_with_orig_idnum(int idnum); 403 Method* method_with_orig_idnum(int idnum, int version); 404 405 // method ordering 406 Array<int>* method_ordering() const { return _method_ordering; } 407 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 408 void copy_method_ordering(const intArray* m, TRAPS); 409 410 // default_methods 411 Array<Method*>* default_methods() const { return _default_methods; } 412 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 413 414 // default method vtable_indices 415 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 416 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 417 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 418 419 // interfaces 420 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; } 421 void set_local_interfaces(Array<InstanceKlass*>* a) { 422 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 423 _local_interfaces = a; } 424 425 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; } 426 void set_transitive_interfaces(Array<InstanceKlass*>* a) { 427 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 428 _transitive_interfaces = a; 429 } 430 431 private: 432 friend class fieldDescriptor; 433 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 434 435 public: 436 int field_offset (int index) const { return field(index)->offset(); } 437 int field_access_flags(int index) const { return field(index)->access_flags(); } 438 Symbol* field_name (int index) const { return field(index)->name(constants()); } 439 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 440 441 // Number of Java declared fields 442 int java_fields_count() const { return (int)_java_fields_count; } 443 444 Array<u2>* fields() const { return _fields; } 445 void set_fields(Array<u2>* f, u2 java_fields_count) { 446 guarantee(_fields == NULL || f == NULL, "Just checking"); 447 _fields = f; 448 _java_fields_count = java_fields_count; 449 } 450 451 // inner classes 452 Array<u2>* inner_classes() const { return _inner_classes; } 453 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 454 455 // nest members 456 Array<u2>* nest_members() const { return _nest_members; } 457 void set_nest_members(Array<u2>* m) { _nest_members = m; } 458 459 // nest-host index 460 jushort nest_host_index() const { return _nest_host_index; } 461 void set_nest_host_index(u2 i) { _nest_host_index = i; } 462 463 private: 464 // Called to verify that k is a member of this nest - does not look at k's nest-host 465 bool has_nest_member(InstanceKlass* k, TRAPS) const; 466 public: 467 // Returns nest-host class, resolving and validating it if needed 468 // Returns NULL if an exception occurs during loading, or validation fails 469 InstanceKlass* nest_host(Symbol* validationException, TRAPS); 470 // Check if this klass is a nestmate of k - resolves this nest-host and k's 471 bool has_nestmate_access_to(InstanceKlass* k, TRAPS); 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 other_class_loader, const Symbol* other_class_name) const; 499 500 // find an enclosing class 501 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const; 502 503 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index. 504 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const; 505 506 private: 507 // Check prohibited package ("java/" only loadable by boot or platform loaders) 508 static void check_prohibited_package(Symbol* class_name, 509 ClassLoaderData* loader_data, 510 TRAPS); 511 public: 512 // initialization state 513 bool is_loaded() const { return _init_state >= loaded; } 514 bool is_linked() const { return _init_state >= linked; } 515 bool is_initialized() const { return _init_state == fully_initialized; } 516 bool is_not_initialized() const { return _init_state < being_initialized; } 517 bool is_being_initialized() const { return _init_state == being_initialized; } 518 bool is_in_error_state() const { return _init_state == initialization_error; } 519 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 520 ClassState init_state() { return (ClassState)_init_state; } 521 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 522 523 // defineClass specified verification 524 bool should_verify_class() const { 525 return (_misc_flags & _misc_should_verify_class) != 0; 526 } 527 void set_should_verify_class(bool value) { 528 if (value) { 529 _misc_flags |= _misc_should_verify_class; 530 } else { 531 _misc_flags &= ~_misc_should_verify_class; 532 } 533 } 534 535 // marking 536 bool is_marked_dependent() const { return _is_marked_dependent; } 537 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 538 539 // initialization (virtuals from Klass) 540 bool should_be_initialized() const; // means that initialize should be called 541 void initialize(TRAPS); 542 void link_class(TRAPS); 543 bool link_class_or_fail(TRAPS); // returns false on failure 544 void rewrite_class(TRAPS); 545 void link_methods(TRAPS); 546 Method* class_initializer() const; 547 548 // set the class to initialized if no static initializer is present 549 void eager_initialize(Thread *thread); 550 551 // reference type 552 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 553 void set_reference_type(ReferenceType t) { 554 assert(t == (u1)t, "overflow"); 555 _reference_type = (u1)t; 556 } 557 558 // this class cp index 559 u2 this_class_index() const { return _this_class_index; } 560 void set_this_class_index(u2 index) { _this_class_index = index; } 561 562 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 563 564 // find local field, returns true if found 565 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 566 // find field in direct superinterfaces, returns the interface in which the field is defined 567 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 568 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 569 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 570 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 571 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 572 573 // find a non-static or static field given its offset within the class. 574 bool contains_field_offset(int offset) { 575 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); 576 } 577 578 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 579 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 580 581 // find a local method (returns NULL if not found) 582 Method* find_method(const Symbol* name, const Symbol* signature) const; 583 static Method* find_method(const Array<Method*>* methods, 584 const Symbol* name, 585 const Symbol* signature); 586 587 // find a local method, but skip static methods 588 Method* find_instance_method(const Symbol* name, const Symbol* signature, 589 PrivateLookupMode private_mode = find_private) const; 590 static Method* find_instance_method(const Array<Method*>* methods, 591 const Symbol* name, 592 const Symbol* signature, 593 PrivateLookupMode private_mode = find_private); 594 595 // find a local method (returns NULL if not found) 596 Method* find_local_method(const Symbol* name, 597 const Symbol* signature, 598 OverpassLookupMode overpass_mode, 599 StaticLookupMode static_mode, 600 PrivateLookupMode private_mode) const; 601 602 // find a local method from given methods array (returns NULL if not found) 603 static Method* find_local_method(const Array<Method*>* methods, 604 const Symbol* name, 605 const Symbol* signature, 606 OverpassLookupMode overpass_mode, 607 StaticLookupMode static_mode, 608 PrivateLookupMode private_mode); 609 610 // find a local method index in methods or default_methods (returns -1 if not found) 611 static int find_method_index(const Array<Method*>* methods, 612 const Symbol* name, 613 const Symbol* signature, 614 OverpassLookupMode overpass_mode, 615 StaticLookupMode static_mode, 616 PrivateLookupMode private_mode); 617 618 // lookup operation (returns NULL if not found) 619 Method* uncached_lookup_method(const Symbol* name, 620 const Symbol* signature, 621 OverpassLookupMode overpass_mode, 622 PrivateLookupMode private_mode = find_private) const; 623 624 // lookup a method in all the interfaces that this class implements 625 // (returns NULL if not found) 626 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 627 628 // lookup a method in local defaults then in all interfaces 629 // (returns NULL if not found) 630 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 631 632 // Find method indices by name. If a method with the specified name is 633 // found the index to the first method is returned, and 'end' is filled in 634 // with the index of first non-name-matching method. If no method is found 635 // -1 is returned. 636 int find_method_by_name(const Symbol* name, int* end) const; 637 static int find_method_by_name(const Array<Method*>* methods, 638 const Symbol* name, int* end); 639 640 // constant pool 641 ConstantPool* constants() const { return _constants; } 642 void set_constants(ConstantPool* c) { _constants = c; } 643 644 // protection domain 645 oop protection_domain() const; 646 647 // signers 648 objArrayOop signers() const; 649 650 // host class 651 InstanceKlass* unsafe_anonymous_host() const { 652 InstanceKlass** hk = adr_unsafe_anonymous_host(); 653 if (hk == NULL) { 654 assert(!is_unsafe_anonymous(), "Unsafe anonymous classes have host klasses"); 655 return NULL; 656 } else { 657 assert(*hk != NULL, "host klass should always be set if the address is not null"); 658 assert(is_unsafe_anonymous(), "Only unsafe anonymous classes have host klasses"); 659 return *hk; 660 } 661 } 662 void set_unsafe_anonymous_host(const InstanceKlass* host) { 663 assert(is_unsafe_anonymous(), "not unsafe anonymous"); 664 const InstanceKlass** addr = (const InstanceKlass **)adr_unsafe_anonymous_host(); 665 assert(addr != NULL, "no reversed space"); 666 if (addr != NULL) { 667 *addr = host; 668 } 669 } 670 bool is_unsafe_anonymous() const { 671 return (_misc_flags & _misc_is_unsafe_anonymous) != 0; 672 } 673 void set_is_unsafe_anonymous(bool value) { 674 if (value) { 675 _misc_flags |= _misc_is_unsafe_anonymous; 676 } else { 677 _misc_flags &= ~_misc_is_unsafe_anonymous; 678 } 679 } 680 681 bool is_contended() const { 682 return (_misc_flags & _misc_is_contended) != 0; 683 } 684 void set_is_contended(bool value) { 685 if (value) { 686 _misc_flags |= _misc_is_contended; 687 } else { 688 _misc_flags &= ~_misc_is_contended; 689 } 690 } 691 692 // source file name 693 Symbol* source_file_name() const { 694 return (_source_file_name_index == 0) ? 695 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index); 696 } 697 u2 source_file_name_index() const { 698 return _source_file_name_index; 699 } 700 void set_source_file_name_index(u2 sourcefile_index) { 701 _source_file_name_index = sourcefile_index; 702 } 703 704 // minor and major version numbers of class file 705 u2 minor_version() const { return _minor_version; } 706 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 707 u2 major_version() const { return _major_version; } 708 void set_major_version(u2 major_version) { _major_version = major_version; } 709 710 // source debug extension 711 const char* source_debug_extension() const { return _source_debug_extension; } 712 void set_source_debug_extension(const char* array, int length); 713 714 // symbol unloading support (refcount already added) 715 Symbol* array_name() { return _array_name; } 716 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; } 717 718 // nonstatic oop-map blocks 719 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 720 return oop_map_count * OopMapBlock::size_in_words(); 721 } 722 unsigned int nonstatic_oop_map_count() const { 723 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 724 } 725 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 726 void set_nonstatic_oop_map_size(int words) { 727 _nonstatic_oop_map_size = words; 728 } 729 730 #if INCLUDE_JVMTI 731 // Redefinition locking. Class can only be redefined by one thread at a time. 732 bool is_being_redefined() const { return _is_being_redefined; } 733 void set_is_being_redefined(bool value) { _is_being_redefined = value; } 734 735 // RedefineClasses() support for previous versions: 736 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 737 void purge_previous_version_list(); 738 739 InstanceKlass* previous_versions() const { return _previous_versions; } 740 #else 741 InstanceKlass* previous_versions() const { return NULL; } 742 #endif 743 744 InstanceKlass* get_klass_version(int version) { 745 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 746 if (ik->constants()->version() == version) { 747 return ik; 748 } 749 } 750 return NULL; 751 } 752 753 bool has_been_redefined() const { 754 return (_misc_flags & _misc_has_been_redefined) != 0; 755 } 756 void set_has_been_redefined() { 757 _misc_flags |= _misc_has_been_redefined; 758 } 759 760 bool has_passed_fingerprint_check() const { 761 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0; 762 } 763 void set_has_passed_fingerprint_check(bool b) { 764 if (b) { 765 _misc_flags |= _misc_has_passed_fingerprint_check; 766 } else { 767 _misc_flags &= ~_misc_has_passed_fingerprint_check; 768 } 769 } 770 bool supers_have_passed_fingerprint_checks(); 771 772 static bool should_store_fingerprint(bool is_unsafe_anonymous); 773 bool should_store_fingerprint() const { return should_store_fingerprint(is_unsafe_anonymous()); } 774 bool has_stored_fingerprint() const; 775 uint64_t get_stored_fingerprint() const; 776 void store_fingerprint(uint64_t fingerprint); 777 778 bool is_scratch_class() const { 779 return (_misc_flags & _misc_is_scratch_class) != 0; 780 } 781 782 void set_is_scratch_class() { 783 _misc_flags |= _misc_is_scratch_class; 784 } 785 786 bool has_resolved_methods() const { 787 return (_misc_flags & _misc_has_resolved_methods) != 0; 788 } 789 790 void set_has_resolved_methods() { 791 _misc_flags |= _misc_has_resolved_methods; 792 } 793 private: 794 795 void set_kind(unsigned kind) { 796 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind"); 797 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos; 798 unsigned flags = _misc_flags & ~fmask; 799 _misc_flags = (flags | (kind << _misc_kind_field_pos)); 800 } 801 802 bool is_kind(unsigned desired) const { 803 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask; 804 return kind == desired; 805 } 806 807 public: 808 809 // Other is anything that is not one of the more specialized kinds of InstanceKlass. 810 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); } 811 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); } 812 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); } 813 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); } 814 815 #if INCLUDE_JVMTI 816 817 void init_previous_versions() { 818 _previous_versions = NULL; 819 } 820 821 private: 822 static bool _has_previous_versions; 823 public: 824 static void purge_previous_versions(InstanceKlass* ik) { 825 if (ik->has_been_redefined()) { 826 ik->purge_previous_version_list(); 827 } 828 } 829 830 static bool has_previous_versions_and_reset(); 831 static bool has_previous_versions() { return _has_previous_versions; } 832 833 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 834 void set_cached_class_file(JvmtiCachedClassFileData *data) { 835 _cached_class_file = data; 836 } 837 JvmtiCachedClassFileData * get_cached_class_file(); 838 jint get_cached_class_file_len(); 839 unsigned char * get_cached_class_file_bytes(); 840 841 // JVMTI: Support for caching of field indices, types, and offsets 842 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 843 _jvmti_cached_class_field_map = descriptor; 844 } 845 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 846 return _jvmti_cached_class_field_map; 847 } 848 849 #if INCLUDE_CDS 850 void set_archived_class_data(JvmtiCachedClassFileData* data) { 851 _cached_class_file = data; 852 } 853 854 JvmtiCachedClassFileData * get_archived_class_data(); 855 #endif // INCLUDE_CDS 856 #else // INCLUDE_JVMTI 857 858 static void purge_previous_versions(InstanceKlass* ik) { return; }; 859 static bool has_previous_versions_and_reset() { return false; } 860 861 void set_cached_class_file(JvmtiCachedClassFileData *data) { 862 assert(data == NULL, "unexpected call with JVMTI disabled"); 863 } 864 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; } 865 866 #endif // INCLUDE_JVMTI 867 868 bool has_nonstatic_concrete_methods() const { 869 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0; 870 } 871 void set_has_nonstatic_concrete_methods(bool b) { 872 if (b) { 873 _misc_flags |= _misc_has_nonstatic_concrete_methods; 874 } else { 875 _misc_flags &= ~_misc_has_nonstatic_concrete_methods; 876 } 877 } 878 879 bool declares_nonstatic_concrete_methods() const { 880 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0; 881 } 882 void set_declares_nonstatic_concrete_methods(bool b) { 883 if (b) { 884 _misc_flags |= _misc_declares_nonstatic_concrete_methods; 885 } else { 886 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods; 887 } 888 } 889 890 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 891 inline u2 next_method_idnum(); 892 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 893 894 // generics support 895 Symbol* generic_signature() const { 896 return (_generic_signature_index == 0) ? 897 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index); 898 } 899 u2 generic_signature_index() const { 900 return _generic_signature_index; 901 } 902 void set_generic_signature_index(u2 sig_index) { 903 _generic_signature_index = sig_index; 904 } 905 906 u2 enclosing_method_data(int offset) const; 907 u2 enclosing_method_class_index() const { 908 return enclosing_method_data(enclosing_method_class_index_offset); 909 } 910 u2 enclosing_method_method_index() { 911 return enclosing_method_data(enclosing_method_method_index_offset); 912 } 913 void set_enclosing_method_indices(u2 class_index, 914 u2 method_index); 915 916 // jmethodID support 917 jmethodID get_jmethod_id(const methodHandle& method_h); 918 jmethodID get_jmethod_id_fetch_or_update(size_t idnum, 919 jmethodID new_id, jmethodID* new_jmeths, 920 jmethodID* to_dealloc_id_p, 921 jmethodID** to_dealloc_jmeths_p); 922 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 923 size_t *length_p, jmethodID* id_p); 924 void ensure_space_for_methodids(int start_offset = 0); 925 jmethodID jmethod_id_or_null(Method* method); 926 927 // annotations support 928 Annotations* annotations() const { return _annotations; } 929 void set_annotations(Annotations* anno) { _annotations = anno; } 930 931 AnnotationArray* class_annotations() const { 932 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 933 } 934 Array<AnnotationArray*>* fields_annotations() const { 935 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 936 } 937 AnnotationArray* class_type_annotations() const { 938 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 939 } 940 Array<AnnotationArray*>* fields_type_annotations() const { 941 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 942 } 943 // allocation 944 instanceOop allocate_instance(TRAPS); 945 946 // additional member function to return a handle 947 instanceHandle allocate_instance_handle(TRAPS); 948 949 objArrayOop allocate_objArray(int n, int length, TRAPS); 950 // Helper function 951 static instanceOop register_finalizer(instanceOop i, TRAPS); 952 953 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 954 // if not, throw either an Error or an Exception. 955 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 956 957 // initialization 958 void call_class_initializer(TRAPS); 959 void set_initialization_state_and_notify(ClassState state, TRAPS); 960 961 // OopMapCache support 962 OopMapCache* oop_map_cache() { return _oop_map_cache; } 963 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 964 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 965 966 // JNI identifier support (for static fields - for jni performance) 967 JNIid* jni_ids() { return _jni_ids; } 968 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 969 JNIid* jni_id_for(int offset); 970 971 // maintenance of deoptimization dependencies 972 inline DependencyContext dependencies(); 973 int mark_dependent_nmethods(KlassDepChange& changes); 974 void add_dependent_nmethod(nmethod* nm); 975 void remove_dependent_nmethod(nmethod* nm); 976 void clean_dependency_context(); 977 978 // On-stack replacement support 979 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 980 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 981 void add_osr_nmethod(nmethod* n); 982 bool remove_osr_nmethod(nmethod* n); 983 int mark_osr_nmethods(const Method* m); 984 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 985 986 #if INCLUDE_JVMTI 987 // Breakpoint support (see methods on Method* for details) 988 BreakpointInfo* breakpoints() const { return _breakpoints; }; 989 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 990 #endif 991 992 // support for stub routines 993 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 994 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;) 995 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 996 997 // subclass/subinterface checks 998 bool implements_interface(Klass* k) const; 999 bool is_same_or_direct_interface(Klass* k) const; 1000 1001 #ifdef ASSERT 1002 // check whether this class or one of its superclasses was redefined 1003 bool has_redefined_this_or_super() const; 1004 #endif 1005 1006 // Access to the implementor of an interface. 1007 Klass* implementor() const; 1008 void set_implementor(Klass* k); 1009 int nof_implementors() const; 1010 void add_implementor(Klass* k); // k is a new class that implements this interface 1011 void init_implementor(); // initialize 1012 1013 // link this class into the implementors list of every interface it implements 1014 void process_interfaces(Thread *thread); 1015 1016 // virtual operations from Klass 1017 bool is_leaf_class() const { return _subklass == NULL; } 1018 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 1019 Array<InstanceKlass*>* transitive_interfaces); 1020 bool compute_is_subtype_of(Klass* k); 1021 bool can_be_primary_super_slow() const; 1022 int oop_size(oop obj) const { return size_helper(); } 1023 // slow because it's a virtual call and used for verifying the layout_helper. 1024 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 1025 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 1026 1027 // Iterators 1028 void do_local_static_fields(FieldClosure* cl); 1029 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 1030 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 1031 1032 void methods_do(void f(Method* method)); 1033 void array_klasses_do(void f(Klass* k)); 1034 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 1035 bool super_types_do(SuperTypeClosure* blk); 1036 1037 static InstanceKlass* cast(Klass* k) { 1038 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 1039 } 1040 1041 static const InstanceKlass* cast(const Klass* k) { 1042 assert(k != NULL, "k should not be null"); 1043 assert(k->is_instance_klass(), "cast to InstanceKlass"); 1044 return static_cast<const InstanceKlass*>(k); 1045 } 1046 1047 virtual InstanceKlass* java_super() const { 1048 return (super() == NULL) ? NULL : cast(super()); 1049 } 1050 1051 // Sizing (in words) 1052 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 1053 1054 static int size(int vtable_length, int itable_length, 1055 int nonstatic_oop_map_size, 1056 bool is_interface, bool is_unsafe_anonymous, bool has_stored_fingerprint) { 1057 return align_metadata_size(header_size() + 1058 vtable_length + 1059 itable_length + 1060 nonstatic_oop_map_size + 1061 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) + 1062 (is_unsafe_anonymous ? (int)sizeof(Klass*)/wordSize : 0) + 1063 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0)); 1064 } 1065 int size() const { return size(vtable_length(), 1066 itable_length(), 1067 nonstatic_oop_map_size(), 1068 is_interface(), 1069 is_unsafe_anonymous(), 1070 has_stored_fingerprint()); 1071 } 1072 #if INCLUDE_SERVICES 1073 virtual void collect_statistics(KlassSizeStats *sz) const; 1074 #endif 1075 1076 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); } 1077 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 1078 1079 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 1080 1081 oop static_field_base_raw() { return java_mirror(); } 1082 1083 OopMapBlock* start_of_nonstatic_oop_maps() const { 1084 return (OopMapBlock*)(start_of_itable() + itable_length()); 1085 } 1086 1087 Klass** end_of_nonstatic_oop_maps() const { 1088 return (Klass**)(start_of_nonstatic_oop_maps() + 1089 nonstatic_oop_map_count()); 1090 } 1091 1092 Klass* volatile* adr_implementor() const { 1093 if (is_interface()) { 1094 return (Klass* volatile*)end_of_nonstatic_oop_maps(); 1095 } else { 1096 return NULL; 1097 } 1098 }; 1099 1100 InstanceKlass** adr_unsafe_anonymous_host() const { 1101 if (is_unsafe_anonymous()) { 1102 InstanceKlass** adr_impl = (InstanceKlass**)adr_implementor(); 1103 if (adr_impl != NULL) { 1104 return adr_impl + 1; 1105 } else { 1106 return (InstanceKlass **)end_of_nonstatic_oop_maps(); 1107 } 1108 } else { 1109 return NULL; 1110 } 1111 } 1112 1113 address adr_fingerprint() const { 1114 if (has_stored_fingerprint()) { 1115 InstanceKlass** adr_host = adr_unsafe_anonymous_host(); 1116 if (adr_host != NULL) { 1117 return (address)(adr_host + 1); 1118 } 1119 1120 Klass* volatile* adr_impl = adr_implementor(); 1121 if (adr_impl != NULL) { 1122 return (address)(adr_impl + 1); 1123 } 1124 1125 return (address)end_of_nonstatic_oop_maps(); 1126 } else { 1127 return NULL; 1128 } 1129 } 1130 1131 // Use this to return the size of an instance in heap words: 1132 int size_helper() const { 1133 return layout_helper_to_size_helper(layout_helper()); 1134 } 1135 1136 // This bit is initialized in classFileParser.cpp. 1137 // It is false under any of the following conditions: 1138 // - the class is abstract (including any interface) 1139 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1140 // - the class size is larger than FastAllocateSizeLimit 1141 // - the class is java/lang/Class, which cannot be allocated directly 1142 bool can_be_fastpath_allocated() const { 1143 return !layout_helper_needs_slow_path(layout_helper()); 1144 } 1145 1146 // Java itable 1147 klassItable itable() const; // return klassItable wrapper 1148 Method* method_at_itable(Klass* holder, int index, TRAPS); 1149 1150 #if INCLUDE_JVMTI 1151 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed); 1152 #endif // INCLUDE_JVMTI 1153 1154 void clean_weak_instanceklass_links(); 1155 private: 1156 void clean_implementors_list(); 1157 void clean_method_data(); 1158 1159 public: 1160 // Explicit metaspace deallocation of fields 1161 // For RedefineClasses and class file parsing errors, we need to deallocate 1162 // instanceKlasses and the metadata they point to. 1163 void deallocate_contents(ClassLoaderData* loader_data); 1164 static void deallocate_methods(ClassLoaderData* loader_data, 1165 Array<Method*>* methods); 1166 void static deallocate_interfaces(ClassLoaderData* loader_data, 1167 const Klass* super_klass, 1168 Array<InstanceKlass*>* local_interfaces, 1169 Array<InstanceKlass*>* transitive_interfaces); 1170 1171 // The constant pool is on stack if any of the methods are executing or 1172 // referenced by handles. 1173 bool on_stack() const { return _constants->on_stack(); } 1174 1175 // callbacks for actions during class unloading 1176 static void unload_class(InstanceKlass* ik); 1177 static void release_C_heap_structures(InstanceKlass* ik); 1178 1179 // Naming 1180 const char* signature_name() const; 1181 static Symbol* package_from_name(const Symbol* name, TRAPS); 1182 1183 // Oop fields (and metadata) iterators 1184 // 1185 // The InstanceKlass iterators also visits the Object's klass. 1186 1187 // Forward iteration 1188 public: 1189 // Iterate over all oop fields in the oop maps. 1190 template <typename T, class OopClosureType> 1191 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1192 1193 // Iterate over all oop fields and metadata. 1194 template <typename T, class OopClosureType> 1195 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 1196 1197 // Iterate over all oop fields in one oop map. 1198 template <typename T, class OopClosureType> 1199 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1200 1201 1202 // Reverse iteration 1203 // Iterate over all oop fields and metadata. 1204 template <typename T, class OopClosureType> 1205 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1206 1207 private: 1208 // Iterate over all oop fields in the oop maps. 1209 template <typename T, class OopClosureType> 1210 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1211 1212 // Iterate over all oop fields in one oop map. 1213 template <typename T, class OopClosureType> 1214 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1215 1216 1217 // Bounded range iteration 1218 public: 1219 // Iterate over all oop fields in the oop maps. 1220 template <typename T, class OopClosureType> 1221 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1222 1223 // Iterate over all oop fields and metadata. 1224 template <typename T, class OopClosureType> 1225 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1226 1227 private: 1228 // Iterate over all oop fields in one oop map. 1229 template <typename T, class OopClosureType> 1230 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1231 1232 1233 public: 1234 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1235 1236 public: 1237 void set_in_error_state() { 1238 assert(DumpSharedSpaces, "only call this when dumping archive"); 1239 _init_state = initialization_error; 1240 } 1241 bool check_sharing_error_state(); 1242 1243 private: 1244 // initialization state 1245 #ifdef ASSERT 1246 void set_init_state(ClassState state); 1247 #else 1248 void set_init_state(ClassState state) { _init_state = (u1)state; } 1249 #endif 1250 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1251 void set_init_thread(Thread *thread) { _init_thread = thread; } 1252 1253 // The RedefineClasses() API can cause new method idnums to be needed 1254 // which will cause the caches to grow. Safety requires different 1255 // cache management logic if the caches can grow instead of just 1256 // going from NULL to non-NULL. 1257 bool idnum_can_increment() const { return has_been_redefined(); } 1258 inline jmethodID* methods_jmethod_ids_acquire() const; 1259 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1260 1261 // Lock during initialization 1262 public: 1263 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1264 // Must be one per class and it has to be a VM internal object so java code 1265 // cannot lock it (like the mirror). 1266 // It has to be an object not a Mutex because it's held through java calls. 1267 oop init_lock() const; 1268 private: 1269 void fence_and_clear_init_lock(); 1270 1271 bool link_class_impl (TRAPS); 1272 bool verify_code (TRAPS); 1273 void initialize_impl (TRAPS); 1274 void initialize_super_interfaces (TRAPS); 1275 void eager_initialize_impl (); 1276 /* jni_id_for_impl for jfieldID only */ 1277 JNIid* jni_id_for_impl (int offset); 1278 1279 // Returns the array class for the n'th dimension 1280 Klass* array_klass_impl(bool or_null, int n, TRAPS); 1281 1282 // Returns the array class with this class as element type 1283 Klass* array_klass_impl(bool or_null, TRAPS); 1284 1285 // find a local method (returns NULL if not found) 1286 Method* find_method_impl(const Symbol* name, 1287 const Symbol* signature, 1288 OverpassLookupMode overpass_mode, 1289 StaticLookupMode static_mode, 1290 PrivateLookupMode private_mode) const; 1291 1292 static Method* find_method_impl(const Array<Method*>* methods, 1293 const Symbol* name, 1294 const Symbol* signature, 1295 OverpassLookupMode overpass_mode, 1296 StaticLookupMode static_mode, 1297 PrivateLookupMode private_mode); 1298 1299 // Free CHeap allocated fields. 1300 void release_C_heap_structures(); 1301 1302 #if INCLUDE_JVMTI 1303 // RedefineClasses support 1304 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1305 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1306 #endif 1307 public: 1308 // CDS support - remove and restore oops from metadata. Oops are not shared. 1309 virtual void remove_unshareable_info(); 1310 virtual void remove_java_mirror(); 1311 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 1312 1313 // jvm support 1314 jint compute_modifier_flags(TRAPS) const; 1315 1316 public: 1317 // JVMTI support 1318 jint jvmti_class_status() const; 1319 1320 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 1321 1322 public: 1323 // Printing 1324 #ifndef PRODUCT 1325 void print_on(outputStream* st) const; 1326 #endif 1327 void print_value_on(outputStream* st) const; 1328 1329 void oop_print_value_on(oop obj, outputStream* st); 1330 1331 #ifndef PRODUCT 1332 void oop_print_on (oop obj, outputStream* st); 1333 1334 void print_dependent_nmethods(bool verbose = false); 1335 bool is_dependent_nmethod(nmethod* nm); 1336 bool verify_itable_index(int index); 1337 #endif 1338 1339 const char* internal_name() const; 1340 1341 // Verification 1342 void verify_on(outputStream* st); 1343 1344 void oop_verify_on(oop obj, outputStream* st); 1345 1346 // Logging 1347 void print_class_load_logging(ClassLoaderData* loader_data, 1348 const char* module_name, 1349 const ClassFileStream* cfs) const; 1350 }; 1351 1352 // for adding methods 1353 // UNSET_IDNUM return means no more ids available 1354 inline u2 InstanceKlass::next_method_idnum() { 1355 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1356 return ConstMethod::UNSET_IDNUM; // no more ids available 1357 } else { 1358 return _idnum_allocated_count++; 1359 } 1360 } 1361 1362 1363 /* JNIid class for jfieldIDs only */ 1364 class JNIid: public CHeapObj<mtClass> { 1365 friend class VMStructs; 1366 private: 1367 Klass* _holder; 1368 JNIid* _next; 1369 int _offset; 1370 #ifdef ASSERT 1371 bool _is_static_field_id; 1372 #endif 1373 1374 public: 1375 // Accessors 1376 Klass* holder() const { return _holder; } 1377 int offset() const { return _offset; } 1378 JNIid* next() { return _next; } 1379 // Constructor 1380 JNIid(Klass* holder, int offset, JNIid* next); 1381 // Identifier lookup 1382 JNIid* find(int offset); 1383 1384 bool find_local_field(fieldDescriptor* fd) { 1385 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1386 } 1387 1388 static void deallocate(JNIid* id); 1389 // Debugging 1390 #ifdef ASSERT 1391 bool is_static_field_id() const { return _is_static_field_id; } 1392 void set_is_static_field_id() { _is_static_field_id = true; } 1393 #endif 1394 void verify(Klass* holder); 1395 }; 1396 1397 // An iterator that's used to access the inner classes indices in the 1398 // InstanceKlass::_inner_classes array. 1399 class InnerClassesIterator : public StackObj { 1400 private: 1401 Array<jushort>* _inner_classes; 1402 int _length; 1403 int _idx; 1404 public: 1405 1406 InnerClassesIterator(const InstanceKlass* k) { 1407 _inner_classes = k->inner_classes(); 1408 if (k->inner_classes() != NULL) { 1409 _length = _inner_classes->length(); 1410 // The inner class array's length should be the multiple of 1411 // inner_class_next_offset if it only contains the InnerClasses 1412 // attribute data, or it should be 1413 // n*inner_class_next_offset+enclosing_method_attribute_size 1414 // if it also contains the EnclosingMethod data. 1415 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1416 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1417 "just checking"); 1418 // Remove the enclosing_method portion if exists. 1419 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1420 _length -= InstanceKlass::enclosing_method_attribute_size; 1421 } 1422 } else { 1423 _length = 0; 1424 } 1425 _idx = 0; 1426 } 1427 1428 int length() const { 1429 return _length; 1430 } 1431 1432 void next() { 1433 _idx += InstanceKlass::inner_class_next_offset; 1434 } 1435 1436 bool done() const { 1437 return (_idx >= _length); 1438 } 1439 1440 u2 inner_class_info_index() const { 1441 return _inner_classes->at( 1442 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1443 } 1444 1445 void set_inner_class_info_index(u2 index) { 1446 _inner_classes->at_put( 1447 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1448 } 1449 1450 u2 outer_class_info_index() const { 1451 return _inner_classes->at( 1452 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1453 } 1454 1455 void set_outer_class_info_index(u2 index) { 1456 _inner_classes->at_put( 1457 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1458 } 1459 1460 u2 inner_name_index() const { 1461 return _inner_classes->at( 1462 _idx + InstanceKlass::inner_class_inner_name_offset); 1463 } 1464 1465 void set_inner_name_index(u2 index) { 1466 _inner_classes->at_put( 1467 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1468 } 1469 1470 u2 inner_access_flags() const { 1471 return _inner_classes->at( 1472 _idx + InstanceKlass::inner_class_access_flags_offset); 1473 } 1474 }; 1475 1476 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP