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 recursive 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 static bool _disable_method_binary_search; 333 334 public: 335 u2 loader_type() { 336 return _misc_flags & loader_type_bits(); 337 } 338 339 bool is_shared_boot_class() const { 340 return (_misc_flags & _misc_is_shared_boot_class) != 0; 341 } 342 bool is_shared_platform_class() const { 343 return (_misc_flags & _misc_is_shared_platform_class) != 0; 344 } 345 bool is_shared_app_class() const { 346 return (_misc_flags & _misc_is_shared_app_class) != 0; 347 } 348 349 void clear_class_loader_type() { 350 _misc_flags &= ~loader_type_bits(); 351 } 352 353 void set_class_loader_type(s2 loader_type); 354 355 bool has_nonstatic_fields() const { 356 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 357 } 358 void set_has_nonstatic_fields(bool b) { 359 if (b) { 360 _misc_flags |= _misc_has_nonstatic_fields; 361 } else { 362 _misc_flags &= ~_misc_has_nonstatic_fields; 363 } 364 } 365 366 // field sizes 367 int nonstatic_field_size() const { return _nonstatic_field_size; } 368 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 369 370 int static_field_size() const { return _static_field_size; } 371 void set_static_field_size(int size) { _static_field_size = size; } 372 373 int static_oop_field_count() const { return (int)_static_oop_field_count; } 374 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 375 376 // Java itable 377 int itable_length() const { return _itable_len; } 378 void set_itable_length(int len) { _itable_len = len; } 379 380 // array klasses 381 Klass* array_klasses() const { return _array_klasses; } 382 inline Klass* array_klasses_acquire() const; // load with acquire semantics 383 void set_array_klasses(Klass* k) { _array_klasses = k; } 384 inline void release_set_array_klasses(Klass* k); // store with release semantics 385 386 // methods 387 Array<Method*>* methods() const { return _methods; } 388 void set_methods(Array<Method*>* a) { _methods = a; } 389 Method* method_with_idnum(int idnum); 390 Method* method_with_orig_idnum(int idnum); 391 Method* method_with_orig_idnum(int idnum, int version); 392 393 // method ordering 394 Array<int>* method_ordering() const { return _method_ordering; } 395 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 396 void copy_method_ordering(const intArray* m, TRAPS); 397 398 // default_methods 399 Array<Method*>* default_methods() const { return _default_methods; } 400 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 401 402 // default method vtable_indices 403 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 404 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 405 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 406 407 // interfaces 408 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; } 409 void set_local_interfaces(Array<InstanceKlass*>* a) { 410 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 411 _local_interfaces = a; } 412 413 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; } 414 void set_transitive_interfaces(Array<InstanceKlass*>* a) { 415 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 416 _transitive_interfaces = a; 417 } 418 419 private: 420 friend class fieldDescriptor; 421 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 422 423 public: 424 int field_offset (int index) const { return field(index)->offset(); } 425 int field_access_flags(int index) const { return field(index)->access_flags(); } 426 Symbol* field_name (int index) const { return field(index)->name(constants()); } 427 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 428 429 // Number of Java declared fields 430 int java_fields_count() const { return (int)_java_fields_count; } 431 432 Array<u2>* fields() const { return _fields; } 433 void set_fields(Array<u2>* f, u2 java_fields_count) { 434 guarantee(_fields == NULL || f == NULL, "Just checking"); 435 _fields = f; 436 _java_fields_count = java_fields_count; 437 } 438 439 // inner classes 440 Array<u2>* inner_classes() const { return _inner_classes; } 441 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 442 443 // nest members 444 Array<u2>* nest_members() const { return _nest_members; } 445 void set_nest_members(Array<u2>* m) { _nest_members = m; } 446 447 // nest-host index 448 jushort nest_host_index() const { return _nest_host_index; } 449 void set_nest_host_index(u2 i) { _nest_host_index = i; } 450 451 private: 452 // Called to verify that k is a member of this nest - does not look at k's nest-host 453 bool has_nest_member(InstanceKlass* k, TRAPS) const; 454 public: 455 // Returns nest-host class, resolving and validating it if needed 456 // Returns NULL if an exception occurs during loading, or validation fails 457 InstanceKlass* nest_host(Symbol* validationException, TRAPS); 458 // Check if this klass is a nestmate of k - resolves this nest-host and k's 459 bool has_nestmate_access_to(InstanceKlass* k, TRAPS); 460 461 enum InnerClassAttributeOffset { 462 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 463 inner_class_inner_class_info_offset = 0, 464 inner_class_outer_class_info_offset = 1, 465 inner_class_inner_name_offset = 2, 466 inner_class_access_flags_offset = 3, 467 inner_class_next_offset = 4 468 }; 469 470 enum EnclosingMethodAttributeOffset { 471 enclosing_method_class_index_offset = 0, 472 enclosing_method_method_index_offset = 1, 473 enclosing_method_attribute_size = 2 474 }; 475 476 // method override check 477 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 478 479 // package 480 PackageEntry* package() const { return _package_entry; } 481 ModuleEntry* module() const; 482 bool in_unnamed_package() const { return (_package_entry == NULL); } 483 void set_package(PackageEntry* p) { _package_entry = p; } 484 void set_package(ClassLoaderData* loader_data, TRAPS); 485 bool is_same_class_package(const Klass* class2) const; 486 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const; 487 488 // find an enclosing class 489 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const; 490 491 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index. 492 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const; 493 494 private: 495 // Check prohibited package ("java/" only loadable by boot or platform loaders) 496 static void check_prohibited_package(Symbol* class_name, 497 ClassLoaderData* loader_data, 498 TRAPS); 499 public: 500 // initialization state 501 bool is_loaded() const { return _init_state >= loaded; } 502 bool is_linked() const { return _init_state >= linked; } 503 bool is_initialized() const { return _init_state == fully_initialized; } 504 bool is_not_initialized() const { return _init_state < being_initialized; } 505 bool is_being_initialized() const { return _init_state == being_initialized; } 506 bool is_in_error_state() const { return _init_state == initialization_error; } 507 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 508 ClassState init_state() { return (ClassState)_init_state; } 509 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 510 511 // defineClass specified verification 512 bool should_verify_class() const { 513 return (_misc_flags & _misc_should_verify_class) != 0; 514 } 515 void set_should_verify_class(bool value) { 516 if (value) { 517 _misc_flags |= _misc_should_verify_class; 518 } else { 519 _misc_flags &= ~_misc_should_verify_class; 520 } 521 } 522 523 // marking 524 bool is_marked_dependent() const { return _is_marked_dependent; } 525 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 526 527 // initialization (virtuals from Klass) 528 bool should_be_initialized() const; // means that initialize should be called 529 void initialize(TRAPS); 530 void link_class(TRAPS); 531 bool link_class_or_fail(TRAPS); // returns false on failure 532 void rewrite_class(TRAPS); 533 void link_methods(TRAPS); 534 Method* class_initializer() const; 535 536 // set the class to initialized if no static initializer is present 537 void eager_initialize(Thread *thread); 538 539 // reference type 540 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 541 void set_reference_type(ReferenceType t) { 542 assert(t == (u1)t, "overflow"); 543 _reference_type = (u1)t; 544 } 545 546 // this class cp index 547 u2 this_class_index() const { return _this_class_index; } 548 void set_this_class_index(u2 index) { _this_class_index = index; } 549 550 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 551 552 // find local field, returns true if found 553 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 554 // find field in direct superinterfaces, returns the interface in which the field is defined 555 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 556 // find field 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, fieldDescriptor* fd) const; 558 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 559 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 560 561 // find a non-static or static field given its offset within the class. 562 bool contains_field_offset(int offset) { 563 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); 564 } 565 566 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 567 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 568 569 private: 570 static int quick_search(const Array<Method*>* methods, const Symbol* name); 571 572 public: 573 static void disable_method_binary_search() { 574 _disable_method_binary_search = true; 575 } 576 577 // find a local method (returns NULL if not found) 578 Method* find_method(const Symbol* name, const Symbol* signature) const; 579 static Method* find_method(const Array<Method*>* methods, 580 const Symbol* name, 581 const Symbol* signature); 582 583 // find a local method, but skip static methods 584 Method* find_instance_method(const Symbol* name, const Symbol* signature, 585 PrivateLookupMode private_mode = find_private) const; 586 static Method* find_instance_method(const Array<Method*>* methods, 587 const Symbol* name, 588 const Symbol* signature, 589 PrivateLookupMode private_mode = find_private); 590 591 // find a local method (returns NULL if not found) 592 Method* find_local_method(const Symbol* name, 593 const Symbol* signature, 594 OverpassLookupMode overpass_mode, 595 StaticLookupMode static_mode, 596 PrivateLookupMode private_mode) const; 597 598 // find a local method from given methods array (returns NULL if not found) 599 static Method* find_local_method(const Array<Method*>* methods, 600 const Symbol* name, 601 const Symbol* signature, 602 OverpassLookupMode overpass_mode, 603 StaticLookupMode static_mode, 604 PrivateLookupMode private_mode); 605 606 // find a local method index in methods or default_methods (returns -1 if not found) 607 static int find_method_index(const Array<Method*>* methods, 608 const Symbol* name, 609 const Symbol* signature, 610 OverpassLookupMode overpass_mode, 611 StaticLookupMode static_mode, 612 PrivateLookupMode private_mode); 613 614 // lookup operation (returns NULL if not found) 615 Method* uncached_lookup_method(const Symbol* name, 616 const Symbol* signature, 617 OverpassLookupMode overpass_mode, 618 PrivateLookupMode private_mode = find_private) const; 619 620 // lookup a method in all the interfaces that this class implements 621 // (returns NULL if not found) 622 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 623 624 // lookup a method in local defaults then in all interfaces 625 // (returns NULL if not found) 626 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 627 628 // Find method indices by name. If a method with the specified name is 629 // found the index to the first method is returned, and 'end' is filled in 630 // with the index of first non-name-matching method. If no method is found 631 // -1 is returned. 632 int find_method_by_name(const Symbol* name, int* end) const; 633 static int find_method_by_name(const Array<Method*>* methods, 634 const Symbol* name, int* end); 635 636 // constant pool 637 ConstantPool* constants() const { return _constants; } 638 void set_constants(ConstantPool* c) { _constants = c; } 639 640 // protection domain 641 oop protection_domain() const; 642 643 // signers 644 objArrayOop signers() const; 645 646 // host class 647 InstanceKlass* unsafe_anonymous_host() const { 648 InstanceKlass** hk = adr_unsafe_anonymous_host(); 649 if (hk == NULL) { 650 assert(!is_unsafe_anonymous(), "Unsafe anonymous classes have host klasses"); 651 return NULL; 652 } else { 653 assert(*hk != NULL, "host klass should always be set if the address is not null"); 654 assert(is_unsafe_anonymous(), "Only unsafe anonymous classes have host klasses"); 655 return *hk; 656 } 657 } 658 void set_unsafe_anonymous_host(const InstanceKlass* host) { 659 assert(is_unsafe_anonymous(), "not unsafe anonymous"); 660 const InstanceKlass** addr = (const InstanceKlass **)adr_unsafe_anonymous_host(); 661 assert(addr != NULL, "no reversed space"); 662 if (addr != NULL) { 663 *addr = host; 664 } 665 } 666 bool is_unsafe_anonymous() const { 667 return (_misc_flags & _misc_is_unsafe_anonymous) != 0; 668 } 669 void set_is_unsafe_anonymous(bool value) { 670 if (value) { 671 _misc_flags |= _misc_is_unsafe_anonymous; 672 } else { 673 _misc_flags &= ~_misc_is_unsafe_anonymous; 674 } 675 } 676 677 bool is_contended() const { 678 return (_misc_flags & _misc_is_contended) != 0; 679 } 680 void set_is_contended(bool value) { 681 if (value) { 682 _misc_flags |= _misc_is_contended; 683 } else { 684 _misc_flags &= ~_misc_is_contended; 685 } 686 } 687 688 // source file name 689 Symbol* source_file_name() const { 690 return (_source_file_name_index == 0) ? 691 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index); 692 } 693 u2 source_file_name_index() const { 694 return _source_file_name_index; 695 } 696 void set_source_file_name_index(u2 sourcefile_index) { 697 _source_file_name_index = sourcefile_index; 698 } 699 700 // minor and major version numbers of class file 701 u2 minor_version() const { return _minor_version; } 702 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 703 u2 major_version() const { return _major_version; } 704 void set_major_version(u2 major_version) { _major_version = major_version; } 705 706 // source debug extension 707 const char* source_debug_extension() const { return _source_debug_extension; } 708 void set_source_debug_extension(const char* array, int length); 709 710 // symbol unloading support (refcount already added) 711 Symbol* array_name() { return _array_name; } 712 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; } 713 714 // nonstatic oop-map blocks 715 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 716 return oop_map_count * OopMapBlock::size_in_words(); 717 } 718 unsigned int nonstatic_oop_map_count() const { 719 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 720 } 721 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 722 void set_nonstatic_oop_map_size(int words) { 723 _nonstatic_oop_map_size = words; 724 } 725 726 #if INCLUDE_JVMTI 727 // Redefinition locking. Class can only be redefined by one thread at a time. 728 bool is_being_redefined() const { return _is_being_redefined; } 729 void set_is_being_redefined(bool value) { _is_being_redefined = value; } 730 731 // RedefineClasses() support for previous versions: 732 void add_previous_version(InstanceKlass* ik, int emcp_method_count); 733 void purge_previous_version_list(); 734 735 InstanceKlass* previous_versions() const { return _previous_versions; } 736 #else 737 InstanceKlass* previous_versions() const { return NULL; } 738 #endif 739 740 InstanceKlass* get_klass_version(int version) { 741 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 742 if (ik->constants()->version() == version) { 743 return ik; 744 } 745 } 746 return NULL; 747 } 748 749 bool has_been_redefined() const { 750 return (_misc_flags & _misc_has_been_redefined) != 0; 751 } 752 void set_has_been_redefined() { 753 _misc_flags |= _misc_has_been_redefined; 754 } 755 756 bool has_passed_fingerprint_check() const { 757 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0; 758 } 759 void set_has_passed_fingerprint_check(bool b) { 760 if (b) { 761 _misc_flags |= _misc_has_passed_fingerprint_check; 762 } else { 763 _misc_flags &= ~_misc_has_passed_fingerprint_check; 764 } 765 } 766 bool supers_have_passed_fingerprint_checks(); 767 768 static bool should_store_fingerprint(bool is_unsafe_anonymous); 769 bool should_store_fingerprint() const { return should_store_fingerprint(is_unsafe_anonymous()); } 770 bool has_stored_fingerprint() const; 771 uint64_t get_stored_fingerprint() const; 772 void store_fingerprint(uint64_t fingerprint); 773 774 bool is_scratch_class() const { 775 return (_misc_flags & _misc_is_scratch_class) != 0; 776 } 777 778 void set_is_scratch_class() { 779 _misc_flags |= _misc_is_scratch_class; 780 } 781 782 bool has_resolved_methods() const { 783 return (_misc_flags & _misc_has_resolved_methods) != 0; 784 } 785 786 void set_has_resolved_methods() { 787 _misc_flags |= _misc_has_resolved_methods; 788 } 789 private: 790 791 void set_kind(unsigned kind) { 792 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind"); 793 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos; 794 unsigned flags = _misc_flags & ~fmask; 795 _misc_flags = (flags | (kind << _misc_kind_field_pos)); 796 } 797 798 bool is_kind(unsigned desired) const { 799 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask; 800 return kind == desired; 801 } 802 803 public: 804 805 // Other is anything that is not one of the more specialized kinds of InstanceKlass. 806 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); } 807 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); } 808 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); } 809 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); } 810 811 #if INCLUDE_JVMTI 812 813 void init_previous_versions() { 814 _previous_versions = NULL; 815 } 816 817 private: 818 static bool _has_previous_versions; 819 public: 820 static void purge_previous_versions(InstanceKlass* ik) { 821 if (ik->has_been_redefined()) { 822 ik->purge_previous_version_list(); 823 } 824 } 825 826 static bool has_previous_versions_and_reset(); 827 static bool has_previous_versions() { return _has_previous_versions; } 828 829 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 830 void set_cached_class_file(JvmtiCachedClassFileData *data) { 831 _cached_class_file = data; 832 } 833 JvmtiCachedClassFileData * get_cached_class_file(); 834 jint get_cached_class_file_len(); 835 unsigned char * get_cached_class_file_bytes(); 836 837 // JVMTI: Support for caching of field indices, types, and offsets 838 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 839 _jvmti_cached_class_field_map = descriptor; 840 } 841 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 842 return _jvmti_cached_class_field_map; 843 } 844 #else // INCLUDE_JVMTI 845 846 static void purge_previous_versions(InstanceKlass* ik) { return; }; 847 static bool has_previous_versions_and_reset() { return false; } 848 849 void set_cached_class_file(JvmtiCachedClassFileData *data) { 850 assert(data == NULL, "unexpected call with JVMTI disabled"); 851 } 852 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; } 853 854 #endif // INCLUDE_JVMTI 855 856 bool has_nonstatic_concrete_methods() const { 857 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0; 858 } 859 void set_has_nonstatic_concrete_methods(bool b) { 860 if (b) { 861 _misc_flags |= _misc_has_nonstatic_concrete_methods; 862 } else { 863 _misc_flags &= ~_misc_has_nonstatic_concrete_methods; 864 } 865 } 866 867 bool declares_nonstatic_concrete_methods() const { 868 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0; 869 } 870 void set_declares_nonstatic_concrete_methods(bool b) { 871 if (b) { 872 _misc_flags |= _misc_declares_nonstatic_concrete_methods; 873 } else { 874 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods; 875 } 876 } 877 878 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 879 inline u2 next_method_idnum(); 880 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 881 882 // generics support 883 Symbol* generic_signature() const { 884 return (_generic_signature_index == 0) ? 885 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index); 886 } 887 u2 generic_signature_index() const { 888 return _generic_signature_index; 889 } 890 void set_generic_signature_index(u2 sig_index) { 891 _generic_signature_index = sig_index; 892 } 893 894 u2 enclosing_method_data(int offset) const; 895 u2 enclosing_method_class_index() const { 896 return enclosing_method_data(enclosing_method_class_index_offset); 897 } 898 u2 enclosing_method_method_index() { 899 return enclosing_method_data(enclosing_method_method_index_offset); 900 } 901 void set_enclosing_method_indices(u2 class_index, 902 u2 method_index); 903 904 // jmethodID support 905 jmethodID get_jmethod_id(const methodHandle& method_h); 906 jmethodID get_jmethod_id_fetch_or_update(size_t idnum, 907 jmethodID new_id, jmethodID* new_jmeths, 908 jmethodID* to_dealloc_id_p, 909 jmethodID** to_dealloc_jmeths_p); 910 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 911 size_t *length_p, jmethodID* id_p); 912 void ensure_space_for_methodids(int start_offset = 0); 913 jmethodID jmethod_id_or_null(Method* method); 914 915 // annotations support 916 Annotations* annotations() const { return _annotations; } 917 void set_annotations(Annotations* anno) { _annotations = anno; } 918 919 AnnotationArray* class_annotations() const { 920 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 921 } 922 Array<AnnotationArray*>* fields_annotations() const { 923 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 924 } 925 AnnotationArray* class_type_annotations() const { 926 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 927 } 928 Array<AnnotationArray*>* fields_type_annotations() const { 929 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 930 } 931 // allocation 932 instanceOop allocate_instance(TRAPS); 933 934 // additional member function to return a handle 935 instanceHandle allocate_instance_handle(TRAPS); 936 937 objArrayOop allocate_objArray(int n, int length, TRAPS); 938 // Helper function 939 static instanceOop register_finalizer(instanceOop i, TRAPS); 940 941 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 942 // if not, throw either an Error or an Exception. 943 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 944 945 // initialization 946 void call_class_initializer(TRAPS); 947 void set_initialization_state_and_notify(ClassState state, TRAPS); 948 949 // OopMapCache support 950 OopMapCache* oop_map_cache() { return _oop_map_cache; } 951 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 952 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 953 954 // JNI identifier support (for static fields - for jni performance) 955 JNIid* jni_ids() { return _jni_ids; } 956 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 957 JNIid* jni_id_for(int offset); 958 959 // maintenance of deoptimization dependencies 960 inline DependencyContext dependencies(); 961 int mark_dependent_nmethods(KlassDepChange& changes); 962 void add_dependent_nmethod(nmethod* nm); 963 void remove_dependent_nmethod(nmethod* nm); 964 void clean_dependency_context(); 965 966 // On-stack replacement support 967 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 968 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 969 void add_osr_nmethod(nmethod* n); 970 bool remove_osr_nmethod(nmethod* n); 971 int mark_osr_nmethods(const Method* m); 972 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 973 974 #if INCLUDE_JVMTI 975 // Breakpoint support (see methods on Method* for details) 976 BreakpointInfo* breakpoints() const { return _breakpoints; }; 977 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 978 #endif 979 980 // support for stub routines 981 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 982 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;) 983 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 984 985 // subclass/subinterface checks 986 bool implements_interface(Klass* k) const; 987 bool is_same_or_direct_interface(Klass* k) const; 988 989 #ifdef ASSERT 990 // check whether this class or one of its superclasses was redefined 991 bool has_redefined_this_or_super() const; 992 #endif 993 994 // Access to the implementor of an interface. 995 Klass* implementor() const; 996 void set_implementor(Klass* k); 997 int nof_implementors() const; 998 void add_implementor(Klass* k); // k is a new class that implements this interface 999 void init_implementor(); // initialize 1000 1001 // link this class into the implementors list of every interface it implements 1002 void process_interfaces(Thread *thread); 1003 1004 // virtual operations from Klass 1005 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots, 1006 Array<InstanceKlass*>* transitive_interfaces); 1007 bool can_be_primary_super_slow() const; 1008 int oop_size(oop obj) const { return size_helper(); } 1009 // slow because it's a virtual call and used for verifying the layout_helper. 1010 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 1011 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 1012 1013 // Iterators 1014 void do_local_static_fields(FieldClosure* cl); 1015 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 1016 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 1017 1018 void methods_do(void f(Method* method)); 1019 void array_klasses_do(void f(Klass* k)); 1020 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 1021 1022 static InstanceKlass* cast(Klass* k) { 1023 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 1024 } 1025 1026 static const InstanceKlass* cast(const Klass* k) { 1027 assert(k != NULL, "k should not be null"); 1028 assert(k->is_instance_klass(), "cast to InstanceKlass"); 1029 return static_cast<const InstanceKlass*>(k); 1030 } 1031 1032 virtual InstanceKlass* java_super() const { 1033 return (super() == NULL) ? NULL : cast(super()); 1034 } 1035 1036 // Sizing (in words) 1037 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 1038 1039 static int size(int vtable_length, int itable_length, 1040 int nonstatic_oop_map_size, 1041 bool is_interface, bool is_unsafe_anonymous, bool has_stored_fingerprint) { 1042 return align_metadata_size(header_size() + 1043 vtable_length + 1044 itable_length + 1045 nonstatic_oop_map_size + 1046 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) + 1047 (is_unsafe_anonymous ? (int)sizeof(Klass*)/wordSize : 0) + 1048 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0)); 1049 } 1050 int size() const { return size(vtable_length(), 1051 itable_length(), 1052 nonstatic_oop_map_size(), 1053 is_interface(), 1054 is_unsafe_anonymous(), 1055 has_stored_fingerprint()); 1056 } 1057 #if INCLUDE_SERVICES 1058 virtual void collect_statistics(KlassSizeStats *sz) const; 1059 #endif 1060 1061 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); } 1062 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 1063 1064 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 1065 1066 oop static_field_base_raw() { return java_mirror(); } 1067 1068 OopMapBlock* start_of_nonstatic_oop_maps() const { 1069 return (OopMapBlock*)(start_of_itable() + itable_length()); 1070 } 1071 1072 Klass** end_of_nonstatic_oop_maps() const { 1073 return (Klass**)(start_of_nonstatic_oop_maps() + 1074 nonstatic_oop_map_count()); 1075 } 1076 1077 Klass* volatile* adr_implementor() const { 1078 if (is_interface()) { 1079 return (Klass* volatile*)end_of_nonstatic_oop_maps(); 1080 } else { 1081 return NULL; 1082 } 1083 }; 1084 1085 InstanceKlass** adr_unsafe_anonymous_host() const { 1086 if (is_unsafe_anonymous()) { 1087 InstanceKlass** adr_impl = (InstanceKlass**)adr_implementor(); 1088 if (adr_impl != NULL) { 1089 return adr_impl + 1; 1090 } else { 1091 return (InstanceKlass **)end_of_nonstatic_oop_maps(); 1092 } 1093 } else { 1094 return NULL; 1095 } 1096 } 1097 1098 address adr_fingerprint() const { 1099 if (has_stored_fingerprint()) { 1100 InstanceKlass** adr_host = adr_unsafe_anonymous_host(); 1101 if (adr_host != NULL) { 1102 return (address)(adr_host + 1); 1103 } 1104 1105 Klass* volatile* adr_impl = adr_implementor(); 1106 if (adr_impl != NULL) { 1107 return (address)(adr_impl + 1); 1108 } 1109 1110 return (address)end_of_nonstatic_oop_maps(); 1111 } else { 1112 return NULL; 1113 } 1114 } 1115 1116 // Use this to return the size of an instance in heap words: 1117 int size_helper() const { 1118 return layout_helper_to_size_helper(layout_helper()); 1119 } 1120 1121 // This bit is initialized in classFileParser.cpp. 1122 // It is false under any of the following conditions: 1123 // - the class is abstract (including any interface) 1124 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1125 // - the class size is larger than FastAllocateSizeLimit 1126 // - the class is java/lang/Class, which cannot be allocated directly 1127 bool can_be_fastpath_allocated() const { 1128 return !layout_helper_needs_slow_path(layout_helper()); 1129 } 1130 1131 // Java itable 1132 klassItable itable() const; // return klassItable wrapper 1133 Method* method_at_itable(Klass* holder, int index, TRAPS); 1134 1135 #if INCLUDE_JVMTI 1136 void adjust_default_methods(bool* trace_name_printed); 1137 #endif // INCLUDE_JVMTI 1138 1139 void clean_weak_instanceklass_links(); 1140 private: 1141 void clean_implementors_list(); 1142 void clean_method_data(); 1143 1144 public: 1145 // Explicit metaspace deallocation of fields 1146 // For RedefineClasses and class file parsing errors, we need to deallocate 1147 // instanceKlasses and the metadata they point to. 1148 void deallocate_contents(ClassLoaderData* loader_data); 1149 static void deallocate_methods(ClassLoaderData* loader_data, 1150 Array<Method*>* methods); 1151 void static deallocate_interfaces(ClassLoaderData* loader_data, 1152 const Klass* super_klass, 1153 Array<InstanceKlass*>* local_interfaces, 1154 Array<InstanceKlass*>* transitive_interfaces); 1155 1156 // The constant pool is on stack if any of the methods are executing or 1157 // referenced by handles. 1158 bool on_stack() const { return _constants->on_stack(); } 1159 1160 // callbacks for actions during class unloading 1161 static void unload_class(InstanceKlass* ik); 1162 static void release_C_heap_structures(InstanceKlass* ik); 1163 1164 // Naming 1165 const char* signature_name() const; 1166 static Symbol* package_from_name(const Symbol* name, TRAPS); 1167 1168 // Oop fields (and metadata) iterators 1169 // 1170 // The InstanceKlass iterators also visits the Object's klass. 1171 1172 // Forward iteration 1173 public: 1174 // Iterate over all oop fields in the oop maps. 1175 template <typename T, class OopClosureType> 1176 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1177 1178 // Iterate over all oop fields and metadata. 1179 template <typename T, class OopClosureType> 1180 inline void oop_oop_iterate(oop obj, OopClosureType* closure); 1181 1182 // Iterate over all oop fields in one oop map. 1183 template <typename T, class OopClosureType> 1184 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1185 1186 1187 // Reverse iteration 1188 // Iterate over all oop fields and metadata. 1189 template <typename T, class OopClosureType> 1190 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1191 1192 private: 1193 // Iterate over all oop fields in the oop maps. 1194 template <typename T, class OopClosureType> 1195 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1196 1197 // Iterate over all oop fields in one oop map. 1198 template <typename T, class OopClosureType> 1199 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1200 1201 1202 // Bounded range iteration 1203 public: 1204 // Iterate over all oop fields in the oop maps. 1205 template <typename T, class OopClosureType> 1206 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1207 1208 // Iterate over all oop fields and metadata. 1209 template <typename T, class OopClosureType> 1210 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1211 1212 private: 1213 // Iterate over all oop fields in one oop map. 1214 template <typename T, class OopClosureType> 1215 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1216 1217 1218 public: 1219 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1220 1221 public: 1222 void set_in_error_state() { 1223 assert(DumpSharedSpaces, "only call this when dumping archive"); 1224 _init_state = initialization_error; 1225 } 1226 bool check_sharing_error_state(); 1227 1228 private: 1229 // initialization state 1230 void set_init_state(ClassState state); 1231 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1232 void set_init_thread(Thread *thread) { _init_thread = thread; } 1233 1234 // The RedefineClasses() API can cause new method idnums to be needed 1235 // which will cause the caches to grow. Safety requires different 1236 // cache management logic if the caches can grow instead of just 1237 // going from NULL to non-NULL. 1238 bool idnum_can_increment() const { return has_been_redefined(); } 1239 inline jmethodID* methods_jmethod_ids_acquire() const; 1240 inline void release_set_methods_jmethod_ids(jmethodID* jmeths); 1241 1242 // Lock during initialization 1243 public: 1244 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1245 // Must be one per class and it has to be a VM internal object so java code 1246 // cannot lock it (like the mirror). 1247 // It has to be an object not a Mutex because it's held through java calls. 1248 oop init_lock() const; 1249 private: 1250 void fence_and_clear_init_lock(); 1251 1252 bool link_class_impl (TRAPS); 1253 bool verify_code (TRAPS); 1254 void initialize_impl (TRAPS); 1255 void initialize_super_interfaces (TRAPS); 1256 void eager_initialize_impl (); 1257 /* jni_id_for_impl for jfieldID only */ 1258 JNIid* jni_id_for_impl (int offset); 1259 1260 // Returns the array class for the n'th dimension 1261 Klass* array_klass_impl(bool or_null, int n, TRAPS); 1262 1263 // Returns the array class with this class as element type 1264 Klass* array_klass_impl(bool or_null, TRAPS); 1265 1266 // find a local method (returns NULL if not found) 1267 Method* find_method_impl(const Symbol* name, 1268 const Symbol* signature, 1269 OverpassLookupMode overpass_mode, 1270 StaticLookupMode static_mode, 1271 PrivateLookupMode private_mode) const; 1272 1273 static Method* find_method_impl(const Array<Method*>* methods, 1274 const Symbol* name, 1275 const Symbol* signature, 1276 OverpassLookupMode overpass_mode, 1277 StaticLookupMode static_mode, 1278 PrivateLookupMode private_mode); 1279 1280 // Free CHeap allocated fields. 1281 void release_C_heap_structures(); 1282 1283 #if INCLUDE_JVMTI 1284 // RedefineClasses support 1285 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1286 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1287 #endif 1288 public: 1289 // CDS support - remove and restore oops from metadata. Oops are not shared. 1290 virtual void remove_unshareable_info(); 1291 virtual void remove_java_mirror(); 1292 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 1293 1294 // jvm support 1295 jint compute_modifier_flags(TRAPS) const; 1296 1297 public: 1298 // JVMTI support 1299 jint jvmti_class_status() const; 1300 1301 virtual void metaspace_pointers_do(MetaspaceClosure* iter); 1302 1303 public: 1304 // Printing 1305 #ifndef PRODUCT 1306 void print_on(outputStream* st) const; 1307 #endif 1308 void print_value_on(outputStream* st) const; 1309 1310 void oop_print_value_on(oop obj, outputStream* st); 1311 1312 #ifndef PRODUCT 1313 void oop_print_on (oop obj, outputStream* st); 1314 1315 void print_dependent_nmethods(bool verbose = false); 1316 bool is_dependent_nmethod(nmethod* nm); 1317 bool verify_itable_index(int index); 1318 #endif 1319 1320 const char* internal_name() const; 1321 1322 // Verification 1323 void verify_on(outputStream* st); 1324 1325 void oop_verify_on(oop obj, outputStream* st); 1326 1327 // Logging 1328 void print_class_load_logging(ClassLoaderData* loader_data, 1329 const char* module_name, 1330 const ClassFileStream* cfs) const; 1331 }; 1332 1333 // for adding methods 1334 // UNSET_IDNUM return means no more ids available 1335 inline u2 InstanceKlass::next_method_idnum() { 1336 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1337 return ConstMethod::UNSET_IDNUM; // no more ids available 1338 } else { 1339 return _idnum_allocated_count++; 1340 } 1341 } 1342 1343 1344 /* JNIid class for jfieldIDs only */ 1345 class JNIid: public CHeapObj<mtClass> { 1346 friend class VMStructs; 1347 private: 1348 Klass* _holder; 1349 JNIid* _next; 1350 int _offset; 1351 #ifdef ASSERT 1352 bool _is_static_field_id; 1353 #endif 1354 1355 public: 1356 // Accessors 1357 Klass* holder() const { return _holder; } 1358 int offset() const { return _offset; } 1359 JNIid* next() { return _next; } 1360 // Constructor 1361 JNIid(Klass* holder, int offset, JNIid* next); 1362 // Identifier lookup 1363 JNIid* find(int offset); 1364 1365 bool find_local_field(fieldDescriptor* fd) { 1366 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1367 } 1368 1369 static void deallocate(JNIid* id); 1370 // Debugging 1371 #ifdef ASSERT 1372 bool is_static_field_id() const { return _is_static_field_id; } 1373 void set_is_static_field_id() { _is_static_field_id = true; } 1374 #endif 1375 void verify(Klass* holder); 1376 }; 1377 1378 // An iterator that's used to access the inner classes indices in the 1379 // InstanceKlass::_inner_classes array. 1380 class InnerClassesIterator : public StackObj { 1381 private: 1382 Array<jushort>* _inner_classes; 1383 int _length; 1384 int _idx; 1385 public: 1386 1387 InnerClassesIterator(const InstanceKlass* k) { 1388 _inner_classes = k->inner_classes(); 1389 if (k->inner_classes() != NULL) { 1390 _length = _inner_classes->length(); 1391 // The inner class array's length should be the multiple of 1392 // inner_class_next_offset if it only contains the InnerClasses 1393 // attribute data, or it should be 1394 // n*inner_class_next_offset+enclosing_method_attribute_size 1395 // if it also contains the EnclosingMethod data. 1396 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1397 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1398 "just checking"); 1399 // Remove the enclosing_method portion if exists. 1400 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1401 _length -= InstanceKlass::enclosing_method_attribute_size; 1402 } 1403 } else { 1404 _length = 0; 1405 } 1406 _idx = 0; 1407 } 1408 1409 int length() const { 1410 return _length; 1411 } 1412 1413 void next() { 1414 _idx += InstanceKlass::inner_class_next_offset; 1415 } 1416 1417 bool done() const { 1418 return (_idx >= _length); 1419 } 1420 1421 u2 inner_class_info_index() const { 1422 return _inner_classes->at( 1423 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1424 } 1425 1426 void set_inner_class_info_index(u2 index) { 1427 _inner_classes->at_put( 1428 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1429 } 1430 1431 u2 outer_class_info_index() const { 1432 return _inner_classes->at( 1433 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1434 } 1435 1436 void set_outer_class_info_index(u2 index) { 1437 _inner_classes->at_put( 1438 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1439 } 1440 1441 u2 inner_name_index() const { 1442 return _inner_classes->at( 1443 _idx + InstanceKlass::inner_class_inner_name_offset); 1444 } 1445 1446 void set_inner_name_index(u2 index) { 1447 _inner_classes->at_put( 1448 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1449 } 1450 1451 u2 inner_access_flags() const { 1452 return _inner_classes->at( 1453 _idx + InstanceKlass::inner_class_access_flags_offset); 1454 } 1455 }; 1456 1457 #endif // SHARE_OOPS_INSTANCEKLASS_HPP