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