1 /* 2 * Copyright (c) 1997, 2019, 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_OOPS_INSTANCEKLASS_HPP 26 #define SHARE_OOPS_INSTANCEKLASS_HPP 27 28 #include "classfile/classLoaderData.hpp" 29 #include "memory/referenceType.hpp" 30 #include "oops/annotations.hpp" 31 #include "oops/constMethod.hpp" 32 #include "oops/fieldInfo.hpp" 33 #include "oops/instanceOop.hpp" 34 #include "oops/klassVtable.hpp" 35 #include "runtime/handles.hpp" 36 #include "runtime/os.hpp" 37 #include "utilities/accessFlags.hpp" 38 #include "utilities/align.hpp" 39 #include "utilities/macros.hpp" 40 #if INCLUDE_JFR 41 #include "jfr/support/jfrKlassExtension.hpp" 42 #endif 43 44 45 // An InstanceKlass is the VM level representation of a Java class. 46 // It contains all information needed for at class at execution runtime. 47 48 // InstanceKlass embedded field layout (after declared fields): 49 // [EMBEDDED Java vtable ] size in words = vtable_len 50 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size 51 // The embedded nonstatic oop-map blocks are short pairs (offset, length) 52 // indicating where oops are located in instances of this klass. 53 // [EMBEDDED implementor of the interface] only exist for interface 54 // [EMBEDDED unsafe_anonymous_host klass] only exist for an unsafe anonymous class (JSR 292 enabled) 55 // [EMBEDDED fingerprint ] only if should_store_fingerprint()==true 56 57 58 // forward declaration for class -- see below for definition 59 #if INCLUDE_JVMTI 60 class BreakpointInfo; 61 #endif 62 class ClassFileParser; 63 class ClassFileStream; 64 class KlassDepChange; 65 class DependencyContext; 66 class fieldDescriptor; 67 class jniIdMapBase; 68 class JNIid; 69 class JvmtiCachedClassFieldMap; 70 class nmethodBucket; 71 class OopMapCache; 72 class InterpreterOopMap; 73 class PackageEntry; 74 class ModuleEntry; 75 76 // This is used in iterators below. 77 class FieldClosure: public StackObj { 78 public: 79 virtual void do_field(fieldDescriptor* fd) = 0; 80 }; 81 82 #ifndef PRODUCT 83 // Print fields. 84 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. 85 class FieldPrinter: public FieldClosure { 86 oop _obj; 87 outputStream* _st; 88 public: 89 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} 90 void do_field(fieldDescriptor* fd); 91 }; 92 #endif // !PRODUCT 93 94 // Describes where oops are located in instances of this klass. 95 class OopMapBlock { 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 // sizeof(OopMapBlock) in words. 106 static const int size_in_words() { 107 return align_up((int)sizeof(OopMapBlock), wordSize) >> 108 LogBytesPerWord; 109 } 110 111 private: 112 int _offset; 113 uint _count; 114 }; 115 116 struct JvmtiCachedClassFileData; 117 118 class InstanceKlass: public Klass { 119 friend class VMStructs; 120 friend class JVMCIVMStructs; 121 friend class ClassFileParser; 122 friend class CompileReplay; 123 124 public: 125 static const KlassID ID = InstanceKlassID; 126 127 protected: 128 InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id = ID); 129 130 public: 131 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } 132 133 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 134 // of the class loading & initialization procedure, and the use of the states. 135 enum ClassState { 136 allocated, // allocated (but not yet linked) 137 loaded, // loaded and inserted in class hierarchy (but not linked yet) 138 linked, // successfully linked/verified (but not initialized yet) 139 being_initialized, // currently running class initializer 140 fully_initialized, // initialized (successfull final state) 141 initialization_error // error happened during initialization 142 }; 143 144 private: 145 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS); 146 147 protected: 148 // If you add a new field that points to any metaspace object, you 149 // must add this field to InstanceKlass::metaspace_pointers_do(). 150 151 // Annotations for this class 152 Annotations* _annotations; 153 // Package this class is defined in 154 PackageEntry* _package_entry; 155 // Array classes holding elements of this class. 156 Klass* volatile _array_klasses; 157 // Constant pool for this class. 158 ConstantPool* _constants; 159 // The InnerClasses attribute and EnclosingMethod attribute. The 160 // _inner_classes is an array of shorts. If the class has InnerClasses 161 // attribute, then the _inner_classes array begins with 4-tuples of shorts 162 // [inner_class_info_index, outer_class_info_index, 163 // inner_name_index, inner_class_access_flags] for the InnerClasses 164 // attribute. If the EnclosingMethod attribute exists, it occupies the 165 // last two shorts [class_index, method_index] of the array. If only 166 // the InnerClasses attribute exists, the _inner_classes array length is 167 // number_of_inner_classes * 4. If the class has both InnerClasses 168 // and EnclosingMethod attributes the _inner_classes array length is 169 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 170 Array<jushort>* _inner_classes; 171 172 // The NestMembers attribute. An array of shorts, where each is a 173 // class info index for the class that is a nest member. This data 174 // has not been validated. 175 Array<jushort>* _nest_members; 176 177 // The NestHost attribute. The class info index for the class 178 // that is the nest-host of this class. This data has not been validated. 179 jushort _nest_host_index; 180 181 // Resolved nest-host klass: either true nest-host or self if we are not nested. 182 // By always being set it makes nest-member access checks simpler. 183 InstanceKlass* _nest_host; 184 185 // the source debug extension for this klass, NULL if not specified. 186 // Specified as UTF-8 string without terminating zero byte in the classfile, 187 // it is stored in the instanceklass as a NULL-terminated UTF-8 string 188 const char* _source_debug_extension; 189 // Array name derived from this class which needs unreferencing 190 // if this class is unloaded. 191 Symbol* _array_name; 192 193 // Number of heapOopSize words used by non-static fields in this klass 194 // (including inherited fields but after header_size()). 195 int _nonstatic_field_size; 196 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 197 // Constant pool index to the utf8 entry of the Generic signature, 198 // or 0 if none. 199 u2 _generic_signature_index; 200 // Constant pool index to the utf8 entry for the name of source file 201 // containing this klass, 0 if not specified. 202 u2 _source_file_name_index; 203 u2 _static_oop_field_count;// number of static oop fields in this klass 204 u2 _java_fields_count; // The number of declared Java fields 205 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 206 207 int _itable_len; // length of Java itable (in words) 208 // _is_marked_dependent can be set concurrently, thus cannot be part of the 209 // _misc_flags. 210 bool _is_marked_dependent; // used for marking during flushing and deoptimization 211 bool _is_being_redefined; // used for locking redefinition 212 213 // The low two bits of _misc_flags contains the kind field. 214 // This can be used to quickly discriminate among the four kinds of 215 // InstanceKlass. 216 217 static const unsigned _misc_kind_field_size = 2; 218 static const unsigned _misc_kind_field_pos = 0; 219 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u; 220 221 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass 222 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass 223 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass 224 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass 225 226 // Start after _misc_kind field. 227 enum { 228 _misc_rewritten = 1 << 2, // methods rewritten. 229 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops 230 _misc_should_verify_class = 1 << 4, // allow caching of preverification 231 _misc_is_unsafe_anonymous = 1 << 5, // has embedded _unsafe_anonymous_host field 232 _misc_is_contended = 1 << 6, // marked with contended annotation 233 _misc_has_nonstatic_concrete_methods = 1 << 7, // class/superclass/implemented interfaces has non-static, concrete methods 234 _misc_declares_nonstatic_concrete_methods = 1 << 8, // directly declares non-static, concrete methods 235 _misc_has_been_redefined = 1 << 9, // class has been redefined 236 _misc_has_passed_fingerprint_check = 1 << 10, // when this class was loaded, the fingerprint computed from its 237 // code source was found to be matching the value recorded by AOT. 238 _misc_is_scratch_class = 1 << 11, // class is the redefined scratch class 239 _misc_is_shared_boot_class = 1 << 12, // defining class loader is boot class loader 240 _misc_is_shared_platform_class = 1 << 13, // defining class loader is platform class loader 241 _misc_is_shared_app_class = 1 << 14, // defining class loader is app class loader 242 _misc_has_resolved_methods = 1 << 15 // resolved methods table entries added for this class 243 }; 244 u2 loader_type_bits() { 245 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class; 246 } 247 u2 _misc_flags; 248 u2 _minor_version; // minor version number of class file 249 u2 _major_version; // major version number of class file 250 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) 251 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 252 JNIid* _jni_ids; // First JNI identifier for static fields in this class 253 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 254 nmethodBucket* volatile _dep_context; // packed DependencyContext structure 255 uint64_t volatile _dep_context_last_cleaned; 256 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 257 #if INCLUDE_JVMTI 258 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 259 // Linked instanceKlasses of previous versions 260 InstanceKlass* _previous_versions; 261 // JVMTI fields can be moved to their own structure - see 6315920 262 // JVMTI: cached class file, before retransformable agent modified it in CFLH 263 JvmtiCachedClassFileData* _cached_class_file; 264 #endif 265 266 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 267 268 // Class states are defined as ClassState (see above). 269 // Place the _init_state here to utilize the unused 2-byte after 270 // _idnum_allocated_count. 271 u1 _init_state; // state of class 272 u1 _reference_type; // reference type 273 274 u2 _this_class_index; // constant pool entry 275 #if INCLUDE_JVMTI 276 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 277 #endif 278 279 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 280 281 // Method array. 282 Array<Method*>* _methods; 283 // Default Method Array, concrete methods inherited from interfaces 284 Array<Method*>* _default_methods; 285 // Interfaces (InstanceKlass*s) this class declares locally to implement. 286 Array<InstanceKlass*>* _local_interfaces; 287 // Interfaces (InstanceKlass*s) this class implements transitively. 288 Array<InstanceKlass*>* _transitive_interfaces; 289 // Int array containing the original order of method in the class file (for JVMTI). 290 Array<int>* _method_ordering; 291 // Int array containing the vtable_indices for default_methods 292 // offset matches _default_methods offset 293 Array<int>* _default_vtable_indices; 294 295 // Instance and static variable information, starts with 6-tuples of shorts 296 // [access, name index, sig index, initval index, low_offset, high_offset] 297 // for all fields, followed by the generic signature data at the end of 298 // the array. Only fields with generic signature attributes have the generic 299 // signature data set in the array. The fields array looks like following: 300 // 301 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 302 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 303 // ... 304 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 305 // [generic signature index] 306 // [generic signature index] 307 // ... 308 Array<u2>* _fields; 309 310 // embedded Java vtable follows here 311 // embedded Java itables follows here 312 // embedded static fields follows here 313 // embedded nonstatic oop-map blocks follows here 314 // embedded implementor of this interface follows here 315 // The embedded implementor only exists if the current klass is an 316 // iterface. The possible values of the implementor fall into following 317 // three cases: 318 // NULL: no implementor. 319 // A Klass* that's not itself: one implementor. 320 // Itself: more than one implementors. 321 // embedded unsafe_anonymous_host klass follows here 322 // The embedded host klass only exists in an unsafe anonymous class for 323 // dynamic language support (JSR 292 enabled). The host class grants 324 // its access privileges to this class also. The host class is either 325 // named, or a previously loaded unsafe anonymous class. A non-anonymous class 326 // or an anonymous class loaded through normal classloading does not 327 // have this embedded field. 328 // 329 330 friend class SystemDictionary; 331 332 public: 333 u2 loader_type() { 334 return _misc_flags & loader_type_bits(); 335 } 336 337 bool is_shared_boot_class() const { 338 return (_misc_flags & _misc_is_shared_boot_class) != 0; 339 } 340 bool is_shared_platform_class() const { 341 return (_misc_flags & _misc_is_shared_platform_class) != 0; 342 } 343 bool is_shared_app_class() const { 344 return (_misc_flags & _misc_is_shared_app_class) != 0; 345 } 346 347 void clear_class_loader_type() { 348 _misc_flags &= ~loader_type_bits(); 349 } 350 351 void set_class_loader_type(s2 loader_type); 352 353 bool has_nonstatic_fields() const { 354 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 355 } 356 void set_has_nonstatic_fields(bool b) { 357 if (b) { 358 _misc_flags |= _misc_has_nonstatic_fields; 359 } else { 360 _misc_flags &= ~_misc_has_nonstatic_fields; 361 } 362 } 363 364 // field sizes 365 int nonstatic_field_size() const { return _nonstatic_field_size; } 366 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 367 368 int static_field_size() const { return _static_field_size; } 369 void set_static_field_size(int size) { _static_field_size = size; } 370 371 int static_oop_field_count() const { return (int)_static_oop_field_count; } 372 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 373 374 // Java itable 375 int itable_length() const { return _itable_len; } 376 void set_itable_length(int len) { _itable_len = len; } 377 378 // array klasses 379 Klass* array_klasses() const { return _array_klasses; } 380 inline Klass* array_klasses_acquire() const; // load with acquire semantics 381 void set_array_klasses(Klass* k) { _array_klasses = k; } 382 inline void release_set_array_klasses(Klass* k); // store with release semantics 383 384 // methods 385 Array<Method*>* methods() const { return _methods; } 386 void set_methods(Array<Method*>* a) { _methods = a; } 387 Method* method_with_idnum(int idnum); 388 Method* method_with_orig_idnum(int idnum); 389 Method* method_with_orig_idnum(int idnum, int version); 390 391 // method ordering 392 Array<int>* method_ordering() const { return _method_ordering; } 393 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 394 void copy_method_ordering(const intArray* m, TRAPS); 395 396 // default_methods 397 Array<Method*>* default_methods() const { return _default_methods; } 398 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 399 400 // default method vtable_indices 401 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 402 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 403 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 404 405 // interfaces 406 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; } 407 void set_local_interfaces(Array<InstanceKlass*>* a) { 408 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 409 _local_interfaces = a; } 410 411 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; } 412 void set_transitive_interfaces(Array<InstanceKlass*>* a) { 413 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 414 _transitive_interfaces = a; 415 } 416 417 private: 418 friend class fieldDescriptor; 419 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 420 421 public: 422 int field_offset (int index) const { return field(index)->offset(); } 423 int field_access_flags(int index) const { return field(index)->access_flags(); } 424 Symbol* field_name (int index) const { return field(index)->name(constants()); } 425 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 426 427 // Number of Java declared fields 428 int java_fields_count() const { return (int)_java_fields_count; } 429 430 Array<u2>* fields() const { return _fields; } 431 void set_fields(Array<u2>* f, u2 java_fields_count) { 432 guarantee(_fields == NULL || f == NULL, "Just checking"); 433 _fields = f; 434 _java_fields_count = java_fields_count; 435 } 436 437 // inner classes 438 Array<u2>* inner_classes() const { return _inner_classes; } 439 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 440 441 // nest members 442 Array<u2>* nest_members() const { return _nest_members; } 443 void set_nest_members(Array<u2>* m) { _nest_members = m; } 444 445 // nest-host index 446 jushort nest_host_index() const { return _nest_host_index; } 447 void set_nest_host_index(u2 i) { _nest_host_index = i; } 448 449 private: 450 // Called to verify that k is a member of this nest - does not look at k's nest-host 451 bool has_nest_member(InstanceKlass* k, TRAPS) const; 452 public: 453 // Returns nest-host class, resolving and validating it if needed 454 // Returns NULL if an exception occurs during loading, or validation fails 455 InstanceKlass* nest_host(Symbol* validationException, TRAPS); 456 // Check if this klass is a nestmate of k - resolves this nest-host and k's 457 bool has_nestmate_access_to(InstanceKlass* k, TRAPS); 458 459 enum InnerClassAttributeOffset { 460 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 461 inner_class_inner_class_info_offset = 0, 462 inner_class_outer_class_info_offset = 1, 463 inner_class_inner_name_offset = 2, 464 inner_class_access_flags_offset = 3, 465 inner_class_next_offset = 4 466 }; 467 468 enum EnclosingMethodAttributeOffset { 469 enclosing_method_class_index_offset = 0, 470 enclosing_method_method_index_offset = 1, 471 enclosing_method_attribute_size = 2 472 }; 473 474 // method override check 475 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 476 477 // package 478 PackageEntry* package() const { return _package_entry; } 479 ModuleEntry* module() const; 480 bool in_unnamed_package() const { return (_package_entry == NULL); } 481 void set_package(PackageEntry* p) { _package_entry = p; } 482 void set_package(ClassLoaderData* loader_data, TRAPS); 483 bool is_same_class_package(const Klass* class2) const; 484 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const; 485 486 // find an enclosing class 487 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const; 488 489 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index. 490 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const; 491 492 private: 493 // Check prohibited package ("java/" only loadable by boot or platform loaders) 494 static void check_prohibited_package(Symbol* class_name, 495 ClassLoaderData* loader_data, 496 TRAPS); 497 public: 498 // initialization state 499 bool is_loaded() const { return _init_state >= loaded; } 500 bool is_linked() const { return _init_state >= linked; } 501 bool is_initialized() const { return _init_state == fully_initialized; } 502 bool is_not_initialized() const { return _init_state < being_initialized; } 503 bool is_being_initialized() const { return _init_state == being_initialized; } 504 bool is_in_error_state() const { return _init_state == initialization_error; } 505 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 506 ClassState init_state() { return (ClassState)_init_state; } 507 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 508 509 // defineClass specified verification 510 bool should_verify_class() const { 511 return (_misc_flags & _misc_should_verify_class) != 0; 512 } 513 void set_should_verify_class(bool value) { 514 if (value) { 515 _misc_flags |= _misc_should_verify_class; 516 } else { 517 _misc_flags &= ~_misc_should_verify_class; 518 } 519 } 520 521 // marking 522 bool is_marked_dependent() const { return _is_marked_dependent; } 523 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 524 525 // initialization (virtuals from Klass) 526 bool should_be_initialized() const; // means that initialize should be called 527 void initialize(TRAPS); 528 void link_class(TRAPS); 529 bool link_class_or_fail(TRAPS); // returns false on failure 530 void rewrite_class(TRAPS); 531 void link_methods(TRAPS); 532 Method* class_initializer() const; 533 534 // set the class to initialized if no static initializer is present 535 void eager_initialize(Thread *thread); 536 537 // reference type 538 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 539 void set_reference_type(ReferenceType t) { 540 assert(t == (u1)t, "overflow"); 541 _reference_type = (u1)t; 542 } 543 544 // this class cp index 545 u2 this_class_index() const { return _this_class_index; } 546 void set_this_class_index(u2 index) { _this_class_index = index; } 547 548 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 549 550 // find local field, returns true if found 551 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 552 // find field in direct superinterfaces, returns the interface in which the field is defined 553 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 554 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 555 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 556 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 557 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 558 559 // find a non-static or static field given its offset within the class. 560 bool contains_field_offset(int offset) { 561 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); 562 } 563 564 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 565 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 566 567 // find a local method (returns NULL if not found) 568 Method* find_method(const Symbol* name, const Symbol* signature) const; 569 static Method* find_method(const Array<Method*>* methods, 570 const Symbol* name, 571 const Symbol* signature); 572 573 // find a local method, but skip static methods 574 Method* find_instance_method(const Symbol* name, const Symbol* signature, 575 PrivateLookupMode private_mode = find_private) const; 576 static Method* find_instance_method(const Array<Method*>* methods, 577 const Symbol* name, 578 const Symbol* signature, 579 PrivateLookupMode private_mode = find_private); 580 581 // find a local method (returns NULL if not found) 582 Method* find_local_method(const Symbol* name, 583 const Symbol* signature, 584 OverpassLookupMode overpass_mode, 585 StaticLookupMode static_mode, 586 PrivateLookupMode private_mode) const; 587 588 // find a local method from given methods array (returns NULL if not found) 589 static Method* find_local_method(const Array<Method*>* methods, 590 const Symbol* name, 591 const Symbol* signature, 592 OverpassLookupMode overpass_mode, 593 StaticLookupMode static_mode, 594 PrivateLookupMode private_mode); 595 596 // find a local method index in methods or default_methods (returns -1 if not found) 597 static int find_method_index(const Array<Method*>* methods, 598 const Symbol* name, 599 const Symbol* signature, 600 OverpassLookupMode overpass_mode, 601 StaticLookupMode static_mode, 602 PrivateLookupMode private_mode); 603 604 // lookup operation (returns NULL if not found) 605 Method* uncached_lookup_method(const Symbol* name, 606 const Symbol* signature, 607 OverpassLookupMode overpass_mode, 608 PrivateLookupMode private_mode = find_private) const; 609 610 // lookup a method in all the interfaces that this class implements 611 // (returns NULL if not found) 612 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 613 614 // lookup a method in local defaults then in all interfaces 615 // (returns NULL if not found) 616 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 617 618 // Find method indices by name. If a method with the specified name is 619 // found the index to the first method is returned, and 'end' is filled in 620 // with the index of first non-name-matching method. If no method is found 621 // -1 is returned. 622 int find_method_by_name(const Symbol* name, int* end) const; 623 static int find_method_by_name(const Array<Method*>* methods, 624 const Symbol* name, int* end); 625 626 // constant pool 627 ConstantPool* constants() const { return _constants; } 628 void set_constants(ConstantPool* c) { _constants = c; } 629 630 // protection domain 631 oop protection_domain() const; 632 633 // signers 634 objArrayOop signers() const; 635 636 // host class 637 InstanceKlass* unsafe_anonymous_host() const { 638 InstanceKlass** hk = adr_unsafe_anonymous_host(); 639 if (hk == NULL) { 640 assert(!is_unsafe_anonymous(), "Unsafe anonymous classes have host klasses"); 641 return NULL; 642 } else { 643 assert(*hk != NULL, "host klass should always be set if the address is not null"); 644 assert(is_unsafe_anonymous(), "Only unsafe anonymous classes have host klasses"); 645 return *hk; 646 } 647 } 648 void set_unsafe_anonymous_host(const InstanceKlass* host) { 649 assert(is_unsafe_anonymous(), "not unsafe anonymous"); 650 const InstanceKlass** addr = (const InstanceKlass **)adr_unsafe_anonymous_host(); 651 assert(addr != NULL, "no reversed space"); 652 if (addr != NULL) { 653 *addr = host; 654 } 655 } 656 bool is_unsafe_anonymous() const { 657 return (_misc_flags & _misc_is_unsafe_anonymous) != 0; 658 } 659 void set_is_unsafe_anonymous(bool value) { 660 if (value) { 661 _misc_flags |= _misc_is_unsafe_anonymous; 662 } else { 663 _misc_flags &= ~_misc_is_unsafe_anonymous; 664 } 665 } 666 667 bool is_contended() const { 668 return (_misc_flags & _misc_is_contended) != 0; 669 } 670 void set_is_contended(bool value) { 671 if (value) { 672 _misc_flags |= _misc_is_contended; 673 } else { 674 _misc_flags &= ~_misc_is_contended; 675 } 676 } 677 678 // source file name 679 Symbol* source_file_name() const { 680 return (_source_file_name_index == 0) ? 681 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index); 682 } 683 u2 source_file_name_index() const { 684 return _source_file_name_index; 685 } 686 void set_source_file_name_index(u2 sourcefile_index) { 687 _source_file_name_index = sourcefile_index; 688 } 689 690 // minor and major version numbers of class file 691 u2 minor_version() const { return _minor_version; } 692 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 693 u2 major_version() const { return _major_version; } 694 void set_major_version(u2 major_version) { _major_version = major_version; } 695 696 // source debug extension 697 const char* source_debug_extension() const { return _source_debug_extension; } 698 void set_source_debug_extension(const char* array, int length); 699 700 // symbol unloading support (refcount already added) 701 Symbol* array_name() { return _array_name; } 702 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; } 703 704 // nonstatic oop-map blocks 705 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 706 return oop_map_count * OopMapBlock::size_in_words(); 707 } 708 unsigned int nonstatic_oop_map_count() const { 709 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 710 } 711 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 712 void set_nonstatic_oop_map_size(int words) { 713 _nonstatic_oop_map_size = words; 714 } 715 716 #if INCLUDE_JVMTI 717 // Redefinition locking. Class can only be redefined by one thread at a time. 718 bool is_being_redefined() const { return _is_being_redefined; } 719 void set_is_being_redefined(bool value) { _is_being_redefined = value; } 720 721 // RedefineClasses() support for previous versions: 722 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 723 void purge_previous_version_list(); 724 725 InstanceKlass* previous_versions() const { return _previous_versions; } 726 #else 727 InstanceKlass* previous_versions() const { return NULL; } 728 #endif 729 730 InstanceKlass* get_klass_version(int version) { 731 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 732 if (ik->constants()->version() == version) { 733 return ik; 734 } 735 } 736 return NULL; 737 } 738 739 bool has_been_redefined() const { 740 return (_misc_flags & _misc_has_been_redefined) != 0; 741 } 742 void set_has_been_redefined() { 743 _misc_flags |= _misc_has_been_redefined; 744 } 745 746 bool has_passed_fingerprint_check() const { 747 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0; 748 } 749 void set_has_passed_fingerprint_check(bool b) { 750 if (b) { 751 _misc_flags |= _misc_has_passed_fingerprint_check; 752 } else { 753 _misc_flags &= ~_misc_has_passed_fingerprint_check; 754 } 755 } 756 bool supers_have_passed_fingerprint_checks(); 757 758 static bool should_store_fingerprint(bool is_unsafe_anonymous); 759 bool should_store_fingerprint() const { return should_store_fingerprint(is_unsafe_anonymous()); } 760 bool has_stored_fingerprint() const; 761 uint64_t get_stored_fingerprint() const; 762 void store_fingerprint(uint64_t fingerprint); 763 764 bool is_scratch_class() const { 765 return (_misc_flags & _misc_is_scratch_class) != 0; 766 } 767 768 void set_is_scratch_class() { 769 _misc_flags |= _misc_is_scratch_class; 770 } 771 772 bool has_resolved_methods() const { 773 return (_misc_flags & _misc_has_resolved_methods) != 0; 774 } 775 776 void set_has_resolved_methods() { 777 _misc_flags |= _misc_has_resolved_methods; 778 } 779 private: 780 781 void set_kind(unsigned kind) { 782 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind"); 783 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos; 784 unsigned flags = _misc_flags & ~fmask; 785 _misc_flags = (flags | (kind << _misc_kind_field_pos)); 786 } 787 788 bool is_kind(unsigned desired) const { 789 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask; 790 return kind == desired; 791 } 792 793 public: 794 795 // Other is anything that is not one of the more specialized kinds of InstanceKlass. 796 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); } 797 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); } 798 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); } 799 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); } 800 801 #if INCLUDE_JVMTI 802 803 void init_previous_versions() { 804 _previous_versions = NULL; 805 } 806 807 private: 808 static bool _has_previous_versions; 809 public: 810 static void purge_previous_versions(InstanceKlass* ik) { 811 if (ik->has_been_redefined()) { 812 ik->purge_previous_version_list(); 813 } 814 } 815 816 static bool has_previous_versions_and_reset(); 817 static bool has_previous_versions() { return _has_previous_versions; } 818 819 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 820 void set_cached_class_file(JvmtiCachedClassFileData *data) { 821 _cached_class_file = data; 822 } 823 JvmtiCachedClassFileData * get_cached_class_file(); 824 jint get_cached_class_file_len(); 825 unsigned char * get_cached_class_file_bytes(); 826 827 // JVMTI: Support for caching of field indices, types, and offsets 828 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 829 _jvmti_cached_class_field_map = descriptor; 830 } 831 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 832 return _jvmti_cached_class_field_map; 833 } 834 #else // INCLUDE_JVMTI 835 836 static void purge_previous_versions(InstanceKlass* ik) { return; }; 837 static bool has_previous_versions_and_reset() { return false; } 838 839 void set_cached_class_file(JvmtiCachedClassFileData *data) { 840 assert(data == NULL, "unexpected call with JVMTI disabled"); 841 } 842 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; } 843 844 #endif // INCLUDE_JVMTI 845 846 bool has_nonstatic_concrete_methods() const { 847 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0; 848 } 849 void set_has_nonstatic_concrete_methods(bool b) { 850 if (b) { 851 _misc_flags |= _misc_has_nonstatic_concrete_methods; 852 } else { 853 _misc_flags &= ~_misc_has_nonstatic_concrete_methods; 854 } 855 } 856 857 bool declares_nonstatic_concrete_methods() const { 858 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0; 859 } 860 void set_declares_nonstatic_concrete_methods(bool b) { 861 if (b) { 862 _misc_flags |= _misc_declares_nonstatic_concrete_methods; 863 } else { 864 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods; 865 } 866 } 867 868 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 869 inline u2 next_method_idnum(); 870 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 871 872 // generics support 873 Symbol* generic_signature() const { 874 return (_generic_signature_index == 0) ? 875 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index); 876 } 877 u2 generic_signature_index() const { 878 return _generic_signature_index; 879 } 880 void set_generic_signature_index(u2 sig_index) { 881 _generic_signature_index = sig_index; 882 } 883 884 u2 enclosing_method_data(int offset) const; 885 u2 enclosing_method_class_index() const { 886 return enclosing_method_data(enclosing_method_class_index_offset); 887 } 888 u2 enclosing_method_method_index() { 889 return enclosing_method_data(enclosing_method_method_index_offset); 890 } 891 void set_enclosing_method_indices(u2 class_index, 892 u2 method_index); 893 894 // jmethodID support 895 jmethodID get_jmethod_id(const methodHandle& method_h); 896 jmethodID get_jmethod_id_fetch_or_update(size_t idnum, 897 jmethodID new_id, jmethodID* new_jmeths, 898 jmethodID* to_dealloc_id_p, 899 jmethodID** to_dealloc_jmeths_p); 900 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 901 size_t *length_p, jmethodID* id_p); 902 void ensure_space_for_methodids(int start_offset = 0); 903 jmethodID jmethod_id_or_null(Method* method); 904 905 // annotations support 906 Annotations* annotations() const { return _annotations; } 907 void set_annotations(Annotations* anno) { _annotations = anno; } 908 909 AnnotationArray* class_annotations() const { 910 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 911 } 912 Array<AnnotationArray*>* fields_annotations() const { 913 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 914 } 915 AnnotationArray* class_type_annotations() const { 916 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 917 } 918 Array<AnnotationArray*>* fields_type_annotations() const { 919 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 920 } 921 // allocation 922 instanceOop allocate_instance(TRAPS); 923 924 // additional member function to return a handle 925 instanceHandle allocate_instance_handle(TRAPS); 926 927 objArrayOop allocate_objArray(int n, int length, TRAPS); 928 // Helper function 929 static instanceOop register_finalizer(instanceOop i, TRAPS); 930 931 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 932 // if not, throw either an Error or an Exception. 933 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 934 935 // initialization 936 void call_class_initializer(TRAPS); 937 void set_initialization_state_and_notify(ClassState state, TRAPS); 938 939 // OopMapCache support 940 OopMapCache* oop_map_cache() { return _oop_map_cache; } 941 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 942 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 943 944 // JNI identifier support (for static fields - for jni performance) 945 JNIid* jni_ids() { return _jni_ids; } 946 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 947 JNIid* jni_id_for(int offset); 948 949 // maintenance of deoptimization dependencies 950 inline DependencyContext dependencies(); 951 int mark_dependent_nmethods(KlassDepChange& changes); 952 void add_dependent_nmethod(nmethod* nm); 953 void remove_dependent_nmethod(nmethod* nm); 954 void clean_dependency_context(); 955 956 // On-stack replacement support 957 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 958 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 959 void add_osr_nmethod(nmethod* n); 960 bool remove_osr_nmethod(nmethod* n); 961 int mark_osr_nmethods(const Method* m); 962 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 963 964 #if INCLUDE_JVMTI 965 // Breakpoint support (see methods on Method* for details) 966 BreakpointInfo* breakpoints() const { return _breakpoints; }; 967 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 968 #endif 969 970 // support for stub routines 971 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 972 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;) 973 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 974 975 // subclass/subinterface checks 976 bool implements_interface(Klass* k) const; 977 bool is_same_or_direct_interface(Klass* k) const; 978 979 #ifdef ASSERT 980 // check whether this class or one of its superclasses was redefined 981 bool has_redefined_this_or_super() const; 982 #endif 983 984 // Access to the implementor of an interface. 985 Klass* implementor() const; 986 void set_implementor(Klass* k); 987 int nof_implementors() const; 988 void add_implementor(Klass* k); // k is a new class that implements this interface 989 void init_implementor(); // initialize 990 991 // link this class into the implementors list of every interface it implements 992 void process_interfaces(Thread *thread); 993 994 // virtual operations from Klass 995 bool is_leaf_class() const { return _subklass == NULL; } 996 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 997 Array<InstanceKlass*>* transitive_interfaces); 998 bool can_be_primary_super_slow() const; 999 int oop_size(oop obj) const { return size_helper(); } 1000 // slow because it's a virtual call and used for verifying the layout_helper. 1001 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 1002 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 1003 1004 // Iterators 1005 void do_local_static_fields(FieldClosure* cl); 1006 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 1007 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 1008 1009 void methods_do(void f(Method* method)); 1010 void array_klasses_do(void f(Klass* k)); 1011 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 1012 1013 static InstanceKlass* cast(Klass* k) { 1014 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 1015 } 1016 1017 static const InstanceKlass* cast(const Klass* k) { 1018 assert(k != NULL, "k should not be null"); 1019 assert(k->is_instance_klass(), "cast to InstanceKlass"); 1020 return static_cast<const InstanceKlass*>(k); 1021 } 1022 1023 virtual InstanceKlass* java_super() const { 1024 return (super() == NULL) ? NULL : cast(super()); 1025 } 1026 1027 // Sizing (in words) 1028 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 1029 1030 static int size(int vtable_length, int itable_length, 1031 int nonstatic_oop_map_size, 1032 bool is_interface, bool is_unsafe_anonymous, bool has_stored_fingerprint) { 1033 return align_metadata_size(header_size() + 1034 vtable_length + 1035 itable_length + 1036 nonstatic_oop_map_size + 1037 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) + 1038 (is_unsafe_anonymous ? (int)sizeof(Klass*)/wordSize : 0) + 1039 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0)); 1040 } 1041 int size() const { return size(vtable_length(), 1042 itable_length(), 1043 nonstatic_oop_map_size(), 1044 is_interface(), 1045 is_unsafe_anonymous(), 1046 has_stored_fingerprint()); 1047 } 1048 #if INCLUDE_SERVICES 1049 virtual void collect_statistics(KlassSizeStats *sz) const; 1050 #endif 1051 1052 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); } 1053 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 1054 1055 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 1056 1057 oop static_field_base_raw() { return java_mirror(); } 1058 1059 OopMapBlock* start_of_nonstatic_oop_maps() const { 1060 return (OopMapBlock*)(start_of_itable() + itable_length()); 1061 } 1062 1063 Klass** end_of_nonstatic_oop_maps() const { 1064 return (Klass**)(start_of_nonstatic_oop_maps() + 1065 nonstatic_oop_map_count()); 1066 } 1067 1068 Klass* volatile* adr_implementor() const { 1069 if (is_interface()) { 1070 return (Klass* volatile*)end_of_nonstatic_oop_maps(); 1071 } else { 1072 return NULL; 1073 } 1074 }; 1075 1076 InstanceKlass** adr_unsafe_anonymous_host() const { 1077 if (is_unsafe_anonymous()) { 1078 InstanceKlass** adr_impl = (InstanceKlass**)adr_implementor(); 1079 if (adr_impl != NULL) { 1080 return adr_impl + 1; 1081 } else { 1082 return (InstanceKlass **)end_of_nonstatic_oop_maps(); 1083 } 1084 } else { 1085 return NULL; 1086 } 1087 } 1088 1089 address adr_fingerprint() const { 1090 if (has_stored_fingerprint()) { 1091 InstanceKlass** adr_host = adr_unsafe_anonymous_host(); 1092 if (adr_host != NULL) { 1093 return (address)(adr_host + 1); 1094 } 1095 1096 Klass* volatile* adr_impl = adr_implementor(); 1097 if (adr_impl != NULL) { 1098 return (address)(adr_impl + 1); 1099 } 1100 1101 return (address)end_of_nonstatic_oop_maps(); 1102 } else { 1103 return NULL; 1104 } 1105 } 1106 1107 // Use this to return the size of an instance in heap words: 1108 int size_helper() const { 1109 return layout_helper_to_size_helper(layout_helper()); 1110 } 1111 1112 // This bit is initialized in classFileParser.cpp. 1113 // It is false under any of the following conditions: 1114 // - the class is abstract (including any interface) 1115 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1116 // - the class size is larger than FastAllocateSizeLimit 1117 // - the class is java/lang/Class, which cannot be allocated directly 1118 bool can_be_fastpath_allocated() const { 1119 return !layout_helper_needs_slow_path(layout_helper()); 1120 } 1121 1122 // Java itable 1123 klassItable itable() const; // return klassItable wrapper 1124 Method* method_at_itable(Klass* holder, int index, TRAPS); 1125 1126 #if INCLUDE_JVMTI 1127 void adjust_default_methods(bool* trace_name_printed); 1128 #endif // INCLUDE_JVMTI 1129 1130 void clean_weak_instanceklass_links(); 1131 private: 1132 void clean_implementors_list(); 1133 void clean_method_data(); 1134 1135 public: 1136 // Explicit metaspace deallocation of fields 1137 // For RedefineClasses and class file parsing errors, we need to deallocate 1138 // instanceKlasses and the metadata they point to. 1139 void deallocate_contents(ClassLoaderData* loader_data); 1140 static void deallocate_methods(ClassLoaderData* loader_data, 1141 Array<Method*>* methods); 1142 void static deallocate_interfaces(ClassLoaderData* loader_data, 1143 const Klass* super_klass, 1144 Array<InstanceKlass*>* local_interfaces, 1145 Array<InstanceKlass*>* transitive_interfaces); 1146 1147 // The constant pool is on stack if any of the methods are executing or 1148 // referenced by handles. 1149 bool on_stack() const { return _constants->on_stack(); } 1150 1151 // callbacks for actions during class unloading 1152 static void unload_class(InstanceKlass* ik); 1153 static void release_C_heap_structures(InstanceKlass* ik); 1154 1155 // Naming 1156 const char* signature_name() const; 1157 static Symbol* package_from_name(const Symbol* name, TRAPS); 1158 1159 // Oop fields (and metadata) iterators 1160 // 1161 // The InstanceKlass iterators also visits the Object's klass. 1162 1163 // Forward iteration 1164 public: 1165 // Iterate over all oop fields in the oop maps. 1166 template <typename T, class OopClosureType> 1167 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1168 1169 // Iterate over all oop fields and metadata. 1170 template <typename T, class OopClosureType> 1171 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 1172 1173 // Iterate over all oop fields in one oop map. 1174 template <typename T, class OopClosureType> 1175 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1176 1177 1178 // Reverse iteration 1179 // Iterate over all oop fields and metadata. 1180 template <typename T, class OopClosureType> 1181 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1182 1183 private: 1184 // Iterate over all oop fields in the oop maps. 1185 template <typename T, class OopClosureType> 1186 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1187 1188 // Iterate over all oop fields in one oop map. 1189 template <typename T, class OopClosureType> 1190 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1191 1192 1193 // Bounded range iteration 1194 public: 1195 // Iterate over all oop fields in the oop maps. 1196 template <typename T, class OopClosureType> 1197 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1198 1199 // Iterate over all oop fields and metadata. 1200 template <typename T, class OopClosureType> 1201 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1202 1203 private: 1204 // Iterate over all oop fields in one oop map. 1205 template <typename T, class OopClosureType> 1206 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1207 1208 1209 public: 1210 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1211 1212 public: 1213 void set_in_error_state() { 1214 assert(DumpSharedSpaces, "only call this when dumping archive"); 1215 _init_state = initialization_error; 1216 } 1217 bool check_sharing_error_state(); 1218 1219 private: 1220 // initialization state 1221 void set_init_state(ClassState state); 1222 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1223 void set_init_thread(Thread *thread) { _init_thread = thread; } 1224 1225 // The RedefineClasses() API can cause new method idnums to be needed 1226 // which will cause the caches to grow. Safety requires different 1227 // cache management logic if the caches can grow instead of just 1228 // going from NULL to non-NULL. 1229 bool idnum_can_increment() const { return has_been_redefined(); } 1230 inline jmethodID* methods_jmethod_ids_acquire() const; 1231 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1232 1233 // Lock during initialization 1234 public: 1235 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1236 // Must be one per class and it has to be a VM internal object so java code 1237 // cannot lock it (like the mirror). 1238 // It has to be an object not a Mutex because it's held through java calls. 1239 oop init_lock() const; 1240 private: 1241 void fence_and_clear_init_lock(); 1242 1243 bool link_class_impl (TRAPS); 1244 bool verify_code (TRAPS); 1245 void initialize_impl (TRAPS); 1246 void initialize_super_interfaces (TRAPS); 1247 void eager_initialize_impl (); 1248 /* jni_id_for_impl for jfieldID only */ 1249 JNIid* jni_id_for_impl (int offset); 1250 1251 // Returns the array class for the n'th dimension 1252 Klass* array_klass_impl(bool or_null, int n, TRAPS); 1253 1254 // Returns the array class with this class as element type 1255 Klass* array_klass_impl(bool or_null, TRAPS); 1256 1257 // find a local method (returns NULL if not found) 1258 Method* find_method_impl(const Symbol* name, 1259 const Symbol* signature, 1260 OverpassLookupMode overpass_mode, 1261 StaticLookupMode static_mode, 1262 PrivateLookupMode private_mode) const; 1263 1264 static Method* find_method_impl(const Array<Method*>* methods, 1265 const Symbol* name, 1266 const Symbol* signature, 1267 OverpassLookupMode overpass_mode, 1268 StaticLookupMode static_mode, 1269 PrivateLookupMode private_mode); 1270 1271 // Free CHeap allocated fields. 1272 void release_C_heap_structures(); 1273 1274 #if INCLUDE_JVMTI 1275 // RedefineClasses support 1276 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1277 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1278 #endif 1279 public: 1280 // CDS support - remove and restore oops from metadata. Oops are not shared. 1281 virtual void remove_unshareable_info(); 1282 virtual void remove_java_mirror(); 1283 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 1284 1285 // jvm support 1286 jint compute_modifier_flags(TRAPS) const; 1287 1288 public: 1289 // JVMTI support 1290 jint jvmti_class_status() const; 1291 1292 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 1293 1294 public: 1295 // Printing 1296 #ifndef PRODUCT 1297 void print_on(outputStream* st) const; 1298 #endif 1299 void print_value_on(outputStream* st) const; 1300 1301 void oop_print_value_on(oop obj, outputStream* st); 1302 1303 #ifndef PRODUCT 1304 void oop_print_on (oop obj, outputStream* st); 1305 1306 void print_dependent_nmethods(bool verbose = false); 1307 bool is_dependent_nmethod(nmethod* nm); 1308 bool verify_itable_index(int index); 1309 #endif 1310 1311 const char* internal_name() const; 1312 1313 // Verification 1314 void verify_on(outputStream* st); 1315 1316 void oop_verify_on(oop obj, outputStream* st); 1317 1318 // Logging 1319 void print_class_load_logging(ClassLoaderData* loader_data, 1320 const char* module_name, 1321 const ClassFileStream* cfs) const; 1322 }; 1323 1324 // for adding methods 1325 // UNSET_IDNUM return means no more ids available 1326 inline u2 InstanceKlass::next_method_idnum() { 1327 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1328 return ConstMethod::UNSET_IDNUM; // no more ids available 1329 } else { 1330 return _idnum_allocated_count++; 1331 } 1332 } 1333 1334 1335 /* JNIid class for jfieldIDs only */ 1336 class JNIid: public CHeapObj<mtClass> { 1337 friend class VMStructs; 1338 private: 1339 Klass* _holder; 1340 JNIid* _next; 1341 int _offset; 1342 #ifdef ASSERT 1343 bool _is_static_field_id; 1344 #endif 1345 1346 public: 1347 // Accessors 1348 Klass* holder() const { return _holder; } 1349 int offset() const { return _offset; } 1350 JNIid* next() { return _next; } 1351 // Constructor 1352 JNIid(Klass* holder, int offset, JNIid* next); 1353 // Identifier lookup 1354 JNIid* find(int offset); 1355 1356 bool find_local_field(fieldDescriptor* fd) { 1357 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1358 } 1359 1360 static void deallocate(JNIid* id); 1361 // Debugging 1362 #ifdef ASSERT 1363 bool is_static_field_id() const { return _is_static_field_id; } 1364 void set_is_static_field_id() { _is_static_field_id = true; } 1365 #endif 1366 void verify(Klass* holder); 1367 }; 1368 1369 // An iterator that's used to access the inner classes indices in the 1370 // InstanceKlass::_inner_classes array. 1371 class InnerClassesIterator : public StackObj { 1372 private: 1373 Array<jushort>* _inner_classes; 1374 int _length; 1375 int _idx; 1376 public: 1377 1378 InnerClassesIterator(const InstanceKlass* k) { 1379 _inner_classes = k->inner_classes(); 1380 if (k->inner_classes() != NULL) { 1381 _length = _inner_classes->length(); 1382 // The inner class array's length should be the multiple of 1383 // inner_class_next_offset if it only contains the InnerClasses 1384 // attribute data, or it should be 1385 // n*inner_class_next_offset+enclosing_method_attribute_size 1386 // if it also contains the EnclosingMethod data. 1387 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1388 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1389 "just checking"); 1390 // Remove the enclosing_method portion if exists. 1391 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1392 _length -= InstanceKlass::enclosing_method_attribute_size; 1393 } 1394 } else { 1395 _length = 0; 1396 } 1397 _idx = 0; 1398 } 1399 1400 int length() const { 1401 return _length; 1402 } 1403 1404 void next() { 1405 _idx += InstanceKlass::inner_class_next_offset; 1406 } 1407 1408 bool done() const { 1409 return (_idx >= _length); 1410 } 1411 1412 u2 inner_class_info_index() const { 1413 return _inner_classes->at( 1414 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1415 } 1416 1417 void set_inner_class_info_index(u2 index) { 1418 _inner_classes->at_put( 1419 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1420 } 1421 1422 u2 outer_class_info_index() const { 1423 return _inner_classes->at( 1424 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1425 } 1426 1427 void set_outer_class_info_index(u2 index) { 1428 _inner_classes->at_put( 1429 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1430 } 1431 1432 u2 inner_name_index() const { 1433 return _inner_classes->at( 1434 _idx + InstanceKlass::inner_class_inner_name_offset); 1435 } 1436 1437 void set_inner_name_index(u2 index) { 1438 _inner_classes->at_put( 1439 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1440 } 1441 1442 u2 inner_access_flags() const { 1443 return _inner_classes->at( 1444 _idx + InstanceKlass::inner_class_access_flags_offset); 1445 } 1446 }; 1447 1448 #endif // SHARE_OOPS_INSTANCEKLASS_HPP