1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_OOPS_INSTANCEKLASS_HPP 26 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP 27 28 #include "classfile/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/atomic.hpp" 36 #include "runtime/handles.hpp" 37 #include "runtime/os.hpp" 38 #include "utilities/accessFlags.hpp" 39 #include "utilities/bitMap.inline.hpp" 40 #include "utilities/macros.hpp" 41 #include "trace/traceMacros.hpp" 42 43 // An InstanceKlass is the VM level representation of a Java class. 44 // It contains all information needed for at class at execution runtime. 45 46 // InstanceKlass layout: 47 // [C++ vtbl pointer ] Klass 48 // [subtype cache ] Klass 49 // [instance size ] Klass 50 // [java mirror ] Klass 51 // [super ] Klass 52 // [access_flags ] Klass 53 // [name ] Klass 54 // [first subklass ] Klass 55 // [next sibling ] Klass 56 // [array klasses ] 57 // [methods ] 58 // [local interfaces ] 59 // [transitive interfaces ] 60 // [fields ] 61 // [constants ] 62 // [class loader ] 63 // [source file name ] 64 // [inner classes ] 65 // [static field size ] 66 // [nonstatic field size ] 67 // [static oop fields size ] 68 // [nonstatic oop maps size ] 69 // [has finalize method ] 70 // [deoptimization mark bit ] 71 // [initialization state ] 72 // [initializing thread ] 73 // [Java vtable length ] 74 // [oop map cache (stack maps) ] 75 // [EMBEDDED Java vtable ] size in words = vtable_len 76 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size 77 // The embedded nonstatic oop-map blocks are short pairs (offset, length) 78 // indicating where oops are located in instances of this klass. 79 // [EMBEDDED implementor of the interface] only exist for interface 80 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled) 81 82 83 // forward declaration for class -- see below for definition 84 class SuperTypeClosure; 85 class JNIid; 86 class jniIdMapBase; 87 class BreakpointInfo; 88 class fieldDescriptor; 89 class DepChange; 90 class nmethodBucket; 91 class JvmtiCachedClassFieldMap; 92 class MemberNameTable; 93 94 // This is used in iterators below. 95 class FieldClosure: public StackObj { 96 public: 97 virtual void do_field(fieldDescriptor* fd) = 0; 98 }; 99 100 #ifndef PRODUCT 101 // Print fields. 102 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. 103 class FieldPrinter: public FieldClosure { 104 oop _obj; 105 outputStream* _st; 106 public: 107 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} 108 void do_field(fieldDescriptor* fd); 109 }; 110 #endif // !PRODUCT 111 112 // ValueObjs embedded in klass. Describes where oops are located in instances of 113 // this klass. 114 class OopMapBlock VALUE_OBJ_CLASS_SPEC { 115 public: 116 // Byte offset of the first oop mapped by this block. 117 int offset() const { return _offset; } 118 void set_offset(int offset) { _offset = offset; } 119 120 // Number of oops in this block. 121 uint count() const { return _count; } 122 void set_count(uint count) { _count = count; } 123 124 // sizeof(OopMapBlock) in HeapWords. 125 static const int size_in_words() { 126 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >> 127 LogHeapWordSize; 128 } 129 130 private: 131 int _offset; 132 uint _count; 133 }; 134 135 struct JvmtiCachedClassFileData; 136 137 class InstanceKlass: public Klass { 138 friend class VMStructs; 139 friend class ClassFileParser; 140 friend class CompileReplay; 141 142 protected: 143 // Constructor 144 InstanceKlass(int vtable_len, 145 int itable_len, 146 int static_field_size, 147 int nonstatic_oop_map_size, 148 ReferenceType rt, 149 AccessFlags access_flags, 150 bool is_anonymous); 151 public: 152 static InstanceKlass* allocate_instance_klass( 153 ClassLoaderData* loader_data, 154 int vtable_len, 155 int itable_len, 156 int static_field_size, 157 int nonstatic_oop_map_size, 158 ReferenceType rt, 159 AccessFlags access_flags, 160 Symbol* name, 161 Klass* super_klass, 162 bool is_anonymous, 163 TRAPS); 164 165 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } 166 167 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 168 // of the class loading & initialization procedure, and the use of the states. 169 enum ClassState { 170 allocated, // allocated (but not yet linked) 171 loaded, // loaded and inserted in class hierarchy (but not linked yet) 172 linked, // successfully linked/verified (but not initialized yet) 173 being_initialized, // currently running class initializer 174 fully_initialized, // initialized (successfull final state) 175 initialization_error // error happened during initialization 176 }; 177 178 static int number_of_instance_classes() { return _total_instanceKlass_count; } 179 180 private: 181 static volatile int _total_instanceKlass_count; 182 183 protected: 184 // Annotations for this class 185 Annotations* _annotations; 186 // Array classes holding elements of this class. 187 Klass* _array_klasses; 188 // Constant pool for this class. 189 ConstantPool* _constants; 190 // The InnerClasses attribute and EnclosingMethod attribute. The 191 // _inner_classes is an array of shorts. If the class has InnerClasses 192 // attribute, then the _inner_classes array begins with 4-tuples of shorts 193 // [inner_class_info_index, outer_class_info_index, 194 // inner_name_index, inner_class_access_flags] for the InnerClasses 195 // attribute. If the EnclosingMethod attribute exists, it occupies the 196 // last two shorts [class_index, method_index] of the array. If only 197 // the InnerClasses attribute exists, the _inner_classes array length is 198 // number_of_inner_classes * 4. If the class has both InnerClasses 199 // and EnclosingMethod attributes the _inner_classes array length is 200 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 201 Array<jushort>* _inner_classes; 202 203 // the source debug extension for this klass, NULL if not specified. 204 // Specified as UTF-8 string without terminating zero byte in the classfile, 205 // it is stored in the instanceklass as a NULL-terminated UTF-8 string 206 char* _source_debug_extension; 207 // Array name derived from this class which needs unreferencing 208 // if this class is unloaded. 209 Symbol* _array_name; 210 211 // Number of heapOopSize words used by non-static fields in this klass 212 // (including inherited fields but after header_size()). 213 int _nonstatic_field_size; 214 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 215 // Constant pool index to the utf8 entry of the Generic signature, 216 // or 0 if none. 217 u2 _generic_signature_index; 218 // Constant pool index to the utf8 entry for the name of source file 219 // containing this klass, 0 if not specified. 220 u2 _source_file_name_index; 221 u2 _static_oop_field_count;// number of static oop fields in this klass 222 u2 _java_fields_count; // The number of declared Java fields 223 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 224 225 // _is_marked_dependent can be set concurrently, thus cannot be part of the 226 // _misc_flags. 227 bool _is_marked_dependent; // used for marking during flushing and deoptimization 228 bool _has_unloaded_dependent; 229 230 enum { 231 _misc_rewritten = 1 << 0, // methods rewritten. 232 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops 233 _misc_should_verify_class = 1 << 2, // allow caching of preverification 234 _misc_is_anonymous = 1 << 3, // has embedded _host_klass field 235 _misc_is_contended = 1 << 4, // marked with contended annotation 236 _misc_has_default_methods = 1 << 5, // class/superclass/implemented interfaces has default methods 237 _misc_declares_default_methods = 1 << 6, // directly declares default methods (any access) 238 _misc_has_been_redefined = 1 << 7 // class has been redefined 239 }; 240 u2 _misc_flags; 241 u2 _minor_version; // minor version number of class file 242 u2 _major_version; // major version number of class file 243 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) 244 int _vtable_len; // length of Java vtable (in words) 245 int _itable_len; // length of Java itable (in words) 246 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 247 MemberNameTable* _member_names; // Member names 248 JNIid* _jni_ids; // First JNI identifier for static fields in this class 249 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 250 nmethodBucket* _dependencies; // list of dependent nmethods 251 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 252 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 253 // Linked instanceKlasses of previous versions 254 InstanceKlass* _previous_versions; 255 // JVMTI fields can be moved to their own structure - see 6315920 256 // JVMTI: cached class file, before retransformable agent modified it in CFLH 257 JvmtiCachedClassFileData* _cached_class_file; 258 259 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 260 261 // Class states are defined as ClassState (see above). 262 // Place the _init_state here to utilize the unused 2-byte after 263 // _idnum_allocated_count. 264 u1 _init_state; // state of class 265 u1 _reference_type; // reference type 266 267 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 268 269 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 270 271 // Method array. 272 Array<Method*>* _methods; 273 // Default Method Array, concrete methods inherited from interfaces 274 Array<Method*>* _default_methods; 275 // Interface (Klass*s) this class declares locally to implement. 276 Array<Klass*>* _local_interfaces; 277 // Interface (Klass*s) this class implements transitively. 278 Array<Klass*>* _transitive_interfaces; 279 // Int array containing the original order of method in the class file (for JVMTI). 280 Array<int>* _method_ordering; 281 // Int array containing the vtable_indices for default_methods 282 // offset matches _default_methods offset 283 Array<int>* _default_vtable_indices; 284 285 // Instance and static variable information, starts with 6-tuples of shorts 286 // [access, name index, sig index, initval index, low_offset, high_offset] 287 // for all fields, followed by the generic signature data at the end of 288 // the array. Only fields with generic signature attributes have the generic 289 // signature data set in the array. The fields array looks like following: 290 // 291 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 292 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 293 // ... 294 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 295 // [generic signature index] 296 // [generic signature index] 297 // ... 298 Array<u2>* _fields; 299 300 // embedded Java vtable follows here 301 // embedded Java itables follows here 302 // embedded static fields follows here 303 // embedded nonstatic oop-map blocks follows here 304 // embedded implementor of this interface follows here 305 // The embedded implementor only exists if the current klass is an 306 // iterface. The possible values of the implementor fall into following 307 // three cases: 308 // NULL: no implementor. 309 // A Klass* that's not itself: one implementor. 310 // Itself: more than one implementors. 311 // embedded host klass follows here 312 // The embedded host klass only exists in an anonymous class for 313 // dynamic language support (JSR 292 enabled). The host class grants 314 // its access privileges to this class also. The host class is either 315 // named, or a previously loaded anonymous class. A non-anonymous class 316 // or an anonymous class loaded through normal classloading does not 317 // have this embedded field. 318 // 319 320 friend class SystemDictionary; 321 322 public: 323 bool has_nonstatic_fields() const { 324 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 325 } 326 void set_has_nonstatic_fields(bool b) { 327 if (b) { 328 _misc_flags |= _misc_has_nonstatic_fields; 329 } else { 330 _misc_flags &= ~_misc_has_nonstatic_fields; 331 } 332 } 333 334 // field sizes 335 int nonstatic_field_size() const { return _nonstatic_field_size; } 336 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 337 338 int static_field_size() const { return _static_field_size; } 339 void set_static_field_size(int size) { _static_field_size = size; } 340 341 int static_oop_field_count() const { return (int)_static_oop_field_count; } 342 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 343 344 // Java vtable 345 int vtable_length() const { return _vtable_len; } 346 void set_vtable_length(int len) { _vtable_len = len; } 347 348 // Java itable 349 int itable_length() const { return _itable_len; } 350 void set_itable_length(int len) { _itable_len = len; } 351 352 // array klasses 353 Klass* array_klasses() const { return _array_klasses; } 354 void set_array_klasses(Klass* k) { _array_klasses = k; } 355 356 // methods 357 Array<Method*>* methods() const { return _methods; } 358 void set_methods(Array<Method*>* a) { _methods = a; } 359 Method* method_with_idnum(int idnum); 360 Method* method_with_orig_idnum(int idnum); 361 Method* method_with_orig_idnum(int idnum, int version); 362 363 // method ordering 364 Array<int>* method_ordering() const { return _method_ordering; } 365 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 366 void copy_method_ordering(intArray* m, TRAPS); 367 368 // default_methods 369 Array<Method*>* default_methods() const { return _default_methods; } 370 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 371 372 // default method vtable_indices 373 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 374 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 375 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 376 377 // interfaces 378 Array<Klass*>* local_interfaces() const { return _local_interfaces; } 379 void set_local_interfaces(Array<Klass*>* a) { 380 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 381 _local_interfaces = a; } 382 383 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; } 384 void set_transitive_interfaces(Array<Klass*>* a) { 385 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 386 _transitive_interfaces = a; 387 } 388 389 private: 390 friend class fieldDescriptor; 391 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 392 393 public: 394 int field_offset (int index) const { return field(index)->offset(); } 395 int field_access_flags(int index) const { return field(index)->access_flags(); } 396 Symbol* field_name (int index) const { return field(index)->name(constants()); } 397 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 398 399 // Number of Java declared fields 400 int java_fields_count() const { return (int)_java_fields_count; } 401 402 Array<u2>* fields() const { return _fields; } 403 void set_fields(Array<u2>* f, u2 java_fields_count) { 404 guarantee(_fields == NULL || f == NULL, "Just checking"); 405 _fields = f; 406 _java_fields_count = java_fields_count; 407 } 408 409 // inner classes 410 Array<u2>* inner_classes() const { return _inner_classes; } 411 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 412 413 enum InnerClassAttributeOffset { 414 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 415 inner_class_inner_class_info_offset = 0, 416 inner_class_outer_class_info_offset = 1, 417 inner_class_inner_name_offset = 2, 418 inner_class_access_flags_offset = 3, 419 inner_class_next_offset = 4 420 }; 421 422 enum EnclosingMethodAttributeOffset { 423 enclosing_method_class_index_offset = 0, 424 enclosing_method_method_index_offset = 1, 425 enclosing_method_attribute_size = 2 426 }; 427 428 // method override check 429 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 430 431 // package 432 bool is_same_class_package(Klass* class2); 433 bool is_same_class_package(oop classloader2, Symbol* classname2); 434 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2); 435 436 // find an enclosing class (defined where original code was, in jvm.cpp!) 437 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) { 438 instanceKlassHandle self(THREAD, this); 439 return compute_enclosing_class_impl(self, inner_is_member, THREAD); 440 } 441 static Klass* compute_enclosing_class_impl(instanceKlassHandle self, 442 bool* inner_is_member, TRAPS); 443 444 // tell if two classes have the same enclosing class (at package level) 445 bool is_same_package_member(Klass* class2, TRAPS) { 446 instanceKlassHandle self(THREAD, this); 447 return is_same_package_member_impl(self, class2, THREAD); 448 } 449 static bool is_same_package_member_impl(instanceKlassHandle self, 450 Klass* class2, TRAPS); 451 452 // initialization state 453 bool is_loaded() const { return _init_state >= loaded; } 454 bool is_linked() const { return _init_state >= linked; } 455 bool is_initialized() const { return _init_state == fully_initialized; } 456 bool is_not_initialized() const { return _init_state < being_initialized; } 457 bool is_being_initialized() const { return _init_state == being_initialized; } 458 bool is_in_error_state() const { return _init_state == initialization_error; } 459 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 460 ClassState init_state() { return (ClassState)_init_state; } 461 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 462 463 // defineClass specified verification 464 bool should_verify_class() const { 465 return (_misc_flags & _misc_should_verify_class) != 0; 466 } 467 void set_should_verify_class(bool value) { 468 if (value) { 469 _misc_flags |= _misc_should_verify_class; 470 } else { 471 _misc_flags &= ~_misc_should_verify_class; 472 } 473 } 474 475 // marking 476 bool is_marked_dependent() const { return _is_marked_dependent; } 477 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 478 479 bool has_unloaded_dependent() const { return _has_unloaded_dependent; } 480 void set_has_unloaded_dependent(bool value) { _has_unloaded_dependent = value; } 481 482 // initialization (virtuals from Klass) 483 bool should_be_initialized() const; // means that initialize should be called 484 void initialize(TRAPS); 485 void link_class(TRAPS); 486 bool link_class_or_fail(TRAPS); // returns false on failure 487 void unlink_class(); 488 void rewrite_class(TRAPS); 489 void link_methods(TRAPS); 490 Method* class_initializer(); 491 492 // set the class to initialized if no static initializer is present 493 void eager_initialize(Thread *thread); 494 495 // reference type 496 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 497 void set_reference_type(ReferenceType t) { 498 assert(t == (u1)t, "overflow"); 499 _reference_type = (u1)t; 500 } 501 502 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 503 504 // find local field, returns true if found 505 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 506 // find field in direct superinterfaces, returns the interface in which the field is defined 507 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 508 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 509 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 510 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 511 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 512 513 // find a non-static or static field given its offset within the class. 514 bool contains_field_offset(int offset) { 515 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); 516 } 517 518 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 519 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 520 521 // find a local method (returns NULL if not found) 522 Method* find_method(Symbol* name, Symbol* signature) const; 523 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature); 524 525 // find a local method, but skip static methods 526 Method* find_instance_method(Symbol* name, Symbol* signature); 527 static Method* find_instance_method(Array<Method*>* methods, Symbol* name, Symbol* signature); 528 529 // find a local method (returns NULL if not found) 530 Method* find_local_method(Symbol* name, Symbol* signature, 531 OverpassLookupMode overpass_mode, 532 StaticLookupMode static_mode, 533 PrivateLookupMode private_mode) const; 534 535 // find a local method from given methods array (returns NULL if not found) 536 static Method* find_local_method(Array<Method*>* methods, 537 Symbol* name, Symbol* signature, 538 OverpassLookupMode overpass_mode, 539 StaticLookupMode static_mode, 540 PrivateLookupMode private_mode); 541 542 // true if method matches signature and conforms to skipping_X conditions. 543 static bool method_matches(Method* m, Symbol* signature, bool skipping_overpass, bool skipping_static, bool skipping_private); 544 545 // find a local method index in methods or default_methods (returns -1 if not found) 546 static int find_method_index(Array<Method*>* methods, 547 Symbol* name, Symbol* signature, 548 OverpassLookupMode overpass_mode, 549 StaticLookupMode static_mode, 550 PrivateLookupMode private_mode); 551 552 553 // lookup operation (returns NULL if not found) 554 Method* uncached_lookup_method(Symbol* name, Symbol* signature, OverpassLookupMode overpass_mode) const; 555 556 // lookup a method in all the interfaces that this class implements 557 // (returns NULL if not found) 558 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 559 560 // lookup a method in local defaults then in all interfaces 561 // (returns NULL if not found) 562 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 563 564 // Find method indices by name. If a method with the specified name is 565 // found the index to the first method is returned, and 'end' is filled in 566 // with the index of first non-name-matching method. If no method is found 567 // -1 is returned. 568 int find_method_by_name(Symbol* name, int* end); 569 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end); 570 571 // constant pool 572 ConstantPool* constants() const { return _constants; } 573 void set_constants(ConstantPool* c) { _constants = c; } 574 575 // protection domain 576 oop protection_domain() const; 577 578 // signers 579 objArrayOop signers() const; 580 581 // host class 582 Klass* host_klass() const { 583 Klass** hk = (Klass**)adr_host_klass(); 584 if (hk == NULL) { 585 assert(!is_anonymous(), "Anonymous classes have host klasses"); 586 return NULL; 587 } else { 588 assert(*hk != NULL, "host klass should always be set if the address is not null"); 589 assert(is_anonymous(), "Only anonymous classes have host klasses"); 590 return *hk; 591 } 592 } 593 void set_host_klass(Klass* host) { 594 assert(is_anonymous(), "not anonymous"); 595 Klass** addr = (Klass**)adr_host_klass(); 596 assert(addr != NULL, "no reversed space"); 597 if (addr != NULL) { 598 *addr = host; 599 } 600 } 601 bool has_host_klass() const { 602 return adr_host_klass() != NULL; 603 } 604 bool is_anonymous() const { 605 return (_misc_flags & _misc_is_anonymous) != 0; 606 } 607 void set_is_anonymous(bool value) { 608 if (value) { 609 _misc_flags |= _misc_is_anonymous; 610 } else { 611 _misc_flags &= ~_misc_is_anonymous; 612 } 613 } 614 615 // Oop that keeps the metadata for this class from being unloaded 616 // in places where the metadata is stored in other places, like nmethods 617 oop klass_holder() const { 618 return is_anonymous() ? java_mirror() : class_loader(); 619 } 620 621 bool is_contended() const { 622 return (_misc_flags & _misc_is_contended) != 0; 623 } 624 void set_is_contended(bool value) { 625 if (value) { 626 _misc_flags |= _misc_is_contended; 627 } else { 628 _misc_flags &= ~_misc_is_contended; 629 } 630 } 631 632 // source file name 633 Symbol* source_file_name() const { 634 return (_source_file_name_index == 0) ? 635 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index); 636 } 637 u2 source_file_name_index() const { 638 return _source_file_name_index; 639 } 640 void set_source_file_name_index(u2 sourcefile_index) { 641 _source_file_name_index = sourcefile_index; 642 } 643 644 // minor and major version numbers of class file 645 u2 minor_version() const { return _minor_version; } 646 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 647 u2 major_version() const { return _major_version; } 648 void set_major_version(u2 major_version) { _major_version = major_version; } 649 650 // source debug extension 651 char* source_debug_extension() const { return _source_debug_extension; } 652 void set_source_debug_extension(char* array, int length); 653 654 // symbol unloading support (refcount already added) 655 Symbol* array_name() { return _array_name; } 656 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; } 657 658 // nonstatic oop-map blocks 659 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 660 return oop_map_count * OopMapBlock::size_in_words(); 661 } 662 unsigned int nonstatic_oop_map_count() const { 663 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 664 } 665 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 666 void set_nonstatic_oop_map_size(int words) { 667 _nonstatic_oop_map_size = words; 668 } 669 670 // RedefineClasses() support for previous versions: 671 void add_previous_version(instanceKlassHandle ikh, int emcp_method_count); 672 673 InstanceKlass* previous_versions() const { return _previous_versions; } 674 675 bool has_been_redefined() const { 676 return (_misc_flags & _misc_has_been_redefined) != 0; 677 } 678 void set_has_been_redefined() { 679 _misc_flags |= _misc_has_been_redefined; 680 } 681 682 void init_previous_versions() { 683 _previous_versions = NULL; 684 } 685 686 687 InstanceKlass* get_klass_version(int version) { 688 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 689 if (ik->constants()->version() == version) { 690 return ik; 691 } 692 } 693 return NULL; 694 } 695 696 static void purge_previous_versions(InstanceKlass* ik); 697 698 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 699 void set_cached_class_file(JvmtiCachedClassFileData *data) { 700 _cached_class_file = data; 701 } 702 JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; } 703 jint get_cached_class_file_len(); 704 unsigned char * get_cached_class_file_bytes(); 705 706 // JVMTI: Support for caching of field indices, types, and offsets 707 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 708 _jvmti_cached_class_field_map = descriptor; 709 } 710 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 711 return _jvmti_cached_class_field_map; 712 } 713 714 bool has_default_methods() const { 715 return (_misc_flags & _misc_has_default_methods) != 0; 716 } 717 void set_has_default_methods(bool b) { 718 if (b) { 719 _misc_flags |= _misc_has_default_methods; 720 } else { 721 _misc_flags &= ~_misc_has_default_methods; 722 } 723 } 724 725 bool declares_default_methods() const { 726 return (_misc_flags & _misc_declares_default_methods) != 0; 727 } 728 void set_declares_default_methods(bool b) { 729 if (b) { 730 _misc_flags |= _misc_declares_default_methods; 731 } else { 732 _misc_flags &= ~_misc_declares_default_methods; 733 } 734 } 735 736 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 737 inline u2 next_method_idnum(); 738 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 739 740 // generics support 741 Symbol* generic_signature() const { 742 return (_generic_signature_index == 0) ? 743 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index); 744 } 745 u2 generic_signature_index() const { 746 return _generic_signature_index; 747 } 748 void set_generic_signature_index(u2 sig_index) { 749 _generic_signature_index = sig_index; 750 } 751 752 u2 enclosing_method_data(int offset); 753 u2 enclosing_method_class_index() { 754 return enclosing_method_data(enclosing_method_class_index_offset); 755 } 756 u2 enclosing_method_method_index() { 757 return enclosing_method_data(enclosing_method_method_index_offset); 758 } 759 void set_enclosing_method_indices(u2 class_index, 760 u2 method_index); 761 762 // jmethodID support 763 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, 764 methodHandle method_h); 765 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h, 766 size_t idnum, jmethodID new_id, jmethodID* new_jmeths, 767 jmethodID* to_dealloc_id_p, 768 jmethodID** to_dealloc_jmeths_p); 769 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 770 size_t *length_p, jmethodID* id_p); 771 jmethodID jmethod_id_or_null(Method* method); 772 773 // annotations support 774 Annotations* annotations() const { return _annotations; } 775 void set_annotations(Annotations* anno) { _annotations = anno; } 776 777 AnnotationArray* class_annotations() const { 778 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 779 } 780 Array<AnnotationArray*>* fields_annotations() const { 781 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 782 } 783 AnnotationArray* class_type_annotations() const { 784 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 785 } 786 Array<AnnotationArray*>* fields_type_annotations() const { 787 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 788 } 789 // allocation 790 instanceOop allocate_instance(TRAPS); 791 792 // additional member function to return a handle 793 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } 794 795 objArrayOop allocate_objArray(int n, int length, TRAPS); 796 // Helper function 797 static instanceOop register_finalizer(instanceOop i, TRAPS); 798 799 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 800 // if not, throw either an Error or an Exception. 801 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 802 803 // initialization 804 void call_class_initializer(TRAPS); 805 void set_initialization_state_and_notify(ClassState state, TRAPS); 806 807 // OopMapCache support 808 OopMapCache* oop_map_cache() { return _oop_map_cache; } 809 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 810 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry); 811 812 // JNI identifier support (for static fields - for jni performance) 813 JNIid* jni_ids() { return _jni_ids; } 814 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 815 JNIid* jni_id_for(int offset); 816 817 // maintenance of deoptimization dependencies 818 int mark_dependent_nmethods(DepChange& changes); 819 void add_dependent_nmethod(nmethod* nm); 820 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately); 821 822 // On-stack replacement support 823 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 824 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 825 void add_osr_nmethod(nmethod* n); 826 void remove_osr_nmethod(nmethod* n); 827 int mark_osr_nmethods(const Method* m); 828 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 829 830 // Breakpoint support (see methods on Method* for details) 831 BreakpointInfo* breakpoints() const { return _breakpoints; }; 832 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 833 834 // support for stub routines 835 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 836 TRACE_DEFINE_OFFSET; 837 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 838 839 // subclass/subinterface checks 840 bool implements_interface(Klass* k) const; 841 bool is_same_or_direct_interface(Klass* k) const; 842 843 #ifdef ASSERT 844 // check whether this class or one of its superclasses was redefined 845 bool has_redefined_this_or_super() const; 846 #endif 847 848 // Access to the implementor of an interface. 849 Klass* implementor() const 850 { 851 Klass** k = adr_implementor(); 852 if (k == NULL) { 853 return NULL; 854 } else { 855 return *k; 856 } 857 } 858 859 void set_implementor(Klass* k) { 860 assert(is_interface(), "not interface"); 861 Klass** addr = adr_implementor(); 862 assert(addr != NULL, "null addr"); 863 if (addr != NULL) { 864 *addr = k; 865 } 866 } 867 868 int nof_implementors() const { 869 Klass* k = implementor(); 870 if (k == NULL) { 871 return 0; 872 } else if (k != this) { 873 return 1; 874 } else { 875 return 2; 876 } 877 } 878 879 void add_implementor(Klass* k); // k is a new class that implements this interface 880 void init_implementor(); // initialize 881 882 // link this class into the implementors list of every interface it implements 883 void process_interfaces(Thread *thread); 884 885 // virtual operations from Klass 886 bool is_leaf_class() const { return _subklass == NULL; } 887 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); 888 bool compute_is_subtype_of(Klass* k); 889 bool can_be_primary_super_slow() const; 890 int oop_size(oop obj) const { return size_helper(); } 891 bool oop_is_instance_slow() const { return true; } 892 893 // Iterators 894 void do_local_static_fields(FieldClosure* cl); 895 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 896 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 897 898 void methods_do(void f(Method* method)); 899 void array_klasses_do(void f(Klass* k)); 900 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 901 bool super_types_do(SuperTypeClosure* blk); 902 903 // Casting from Klass* 904 static InstanceKlass* cast(Klass* k) { 905 assert(k == NULL || k->is_klass(), "must be"); 906 assert(k == NULL || k->oop_is_instance(), "cast to InstanceKlass"); 907 return (InstanceKlass*) k; 908 } 909 910 InstanceKlass* java_super() const { 911 return (super() == NULL) ? NULL : cast(super()); 912 } 913 914 // Sizing (in words) 915 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); } 916 917 static int size(int vtable_length, int itable_length, 918 int nonstatic_oop_map_size, 919 bool is_interface, bool is_anonymous) { 920 return align_object_size(header_size() + 921 align_object_offset(vtable_length) + 922 align_object_offset(itable_length) + 923 ((is_interface || is_anonymous) ? 924 align_object_offset(nonstatic_oop_map_size) : 925 nonstatic_oop_map_size) + 926 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) + 927 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0)); 928 } 929 int size() const { return size(vtable_length(), 930 itable_length(), 931 nonstatic_oop_map_size(), 932 is_interface(), 933 is_anonymous()); 934 } 935 #if INCLUDE_SERVICES 936 virtual void collect_statistics(KlassSizeStats *sz) const; 937 #endif 938 939 static int vtable_start_offset() { return header_size(); } 940 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; } 941 942 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); } 943 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); } 944 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 945 946 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 947 948 address static_field_addr(int offset); 949 950 OopMapBlock* start_of_nonstatic_oop_maps() const { 951 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length())); 952 } 953 954 Klass** end_of_nonstatic_oop_maps() const { 955 return (Klass**)(start_of_nonstatic_oop_maps() + 956 nonstatic_oop_map_count()); 957 } 958 959 Klass** adr_implementor() const { 960 if (is_interface()) { 961 return (Klass**)end_of_nonstatic_oop_maps(); 962 } else { 963 return NULL; 964 } 965 }; 966 967 Klass** adr_host_klass() const { 968 if (is_anonymous()) { 969 Klass** adr_impl = adr_implementor(); 970 if (adr_impl != NULL) { 971 return adr_impl + 1; 972 } else { 973 return end_of_nonstatic_oop_maps(); 974 } 975 } else { 976 return NULL; 977 } 978 } 979 980 // Use this to return the size of an instance in heap words: 981 int size_helper() const { 982 return layout_helper_to_size_helper(layout_helper()); 983 } 984 985 // This bit is initialized in classFileParser.cpp. 986 // It is false under any of the following conditions: 987 // - the class is abstract (including any interface) 988 // - the class has a finalizer (if !RegisterFinalizersAtInit) 989 // - the class size is larger than FastAllocateSizeLimit 990 // - the class is java/lang/Class, which cannot be allocated directly 991 bool can_be_fastpath_allocated() const { 992 return !layout_helper_needs_slow_path(layout_helper()); 993 } 994 995 // Java vtable/itable 996 klassVtable* vtable() const; // return new klassVtable wrapper 997 inline Method* method_at_vtable(int index); 998 klassItable* itable() const; // return new klassItable wrapper 999 Method* method_at_itable(Klass* holder, int index, TRAPS); 1000 1001 #if INCLUDE_JVMTI 1002 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed); 1003 #endif // INCLUDE_JVMTI 1004 1005 // Garbage collection 1006 void oop_follow_contents(oop obj); 1007 int oop_adjust_pointers(oop obj); 1008 1009 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive); 1010 void clean_implementors_list(BoolObjectClosure* is_alive); 1011 void clean_method_data(BoolObjectClosure* is_alive); 1012 void clean_dependent_nmethods(); 1013 1014 // Explicit metaspace deallocation of fields 1015 // For RedefineClasses and class file parsing errors, we need to deallocate 1016 // instanceKlasses and the metadata they point to. 1017 void deallocate_contents(ClassLoaderData* loader_data); 1018 static void deallocate_methods(ClassLoaderData* loader_data, 1019 Array<Method*>* methods); 1020 void static deallocate_interfaces(ClassLoaderData* loader_data, 1021 Klass* super_klass, 1022 Array<Klass*>* local_interfaces, 1023 Array<Klass*>* transitive_interfaces); 1024 1025 // The constant pool is on stack if any of the methods are executing or 1026 // referenced by handles. 1027 bool on_stack() const { return _constants->on_stack(); } 1028 1029 // callbacks for actions during class unloading 1030 static void notify_unload_class(InstanceKlass* ik); 1031 static void release_C_heap_structures(InstanceKlass* ik); 1032 1033 // Parallel Scavenge and Parallel Old 1034 PARALLEL_GC_DECLS 1035 1036 // Naming 1037 const char* signature_name() const; 1038 1039 // Iterators 1040 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) { 1041 return oop_oop_iterate_v(obj, blk); 1042 } 1043 1044 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) { 1045 return oop_oop_iterate_v_m(obj, blk, mr); 1046 } 1047 1048 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ 1049 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ 1050 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \ 1051 MemRegion mr); 1052 1053 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL) 1054 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL) 1055 1056 #if INCLUDE_ALL_GCS 1057 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ 1058 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); 1059 1060 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 1061 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 1062 #endif // INCLUDE_ALL_GCS 1063 1064 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1065 1066 public: 1067 void set_in_error_state() { 1068 assert(DumpSharedSpaces, "only call this when dumping archive"); 1069 _init_state = initialization_error; 1070 } 1071 bool check_sharing_error_state(); 1072 1073 private: 1074 // initialization state 1075 #ifdef ASSERT 1076 void set_init_state(ClassState state); 1077 #else 1078 void set_init_state(ClassState state) { _init_state = (u1)state; } 1079 #endif 1080 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1081 void set_init_thread(Thread *thread) { _init_thread = thread; } 1082 1083 // The RedefineClasses() API can cause new method idnums to be needed 1084 // which will cause the caches to grow. Safety requires different 1085 // cache management logic if the caches can grow instead of just 1086 // going from NULL to non-NULL. 1087 bool idnum_can_increment() const { return has_been_redefined(); } 1088 jmethodID* methods_jmethod_ids_acquire() const 1089 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); } 1090 void release_set_methods_jmethod_ids(jmethodID* jmeths) 1091 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); } 1092 1093 // Lock during initialization 1094 public: 1095 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1096 // Must be one per class and it has to be a VM internal object so java code 1097 // cannot lock it (like the mirror). 1098 // It has to be an object not a Mutex because it's held through java calls. 1099 oop init_lock() const; 1100 private: 1101 void fence_and_clear_init_lock(); 1102 1103 // Static methods that are used to implement member methods where an exposed this pointer 1104 // is needed due to possible GCs 1105 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); 1106 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); 1107 static void initialize_impl (instanceKlassHandle this_oop, TRAPS); 1108 static void initialize_super_interfaces (instanceKlassHandle this_oop, TRAPS); 1109 static void eager_initialize_impl (instanceKlassHandle this_oop); 1110 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS); 1111 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS); 1112 static Klass* array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS); 1113 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS); 1114 /* jni_id_for_impl for jfieldID only */ 1115 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset); 1116 1117 // Returns the array class for the n'th dimension 1118 Klass* array_klass_impl(bool or_null, int n, TRAPS); 1119 1120 // Returns the array class with this class as element type 1121 Klass* array_klass_impl(bool or_null, TRAPS); 1122 1123 // find a local method (returns NULL if not found) 1124 Method* find_method_impl(Symbol* name, Symbol* signature, 1125 OverpassLookupMode overpass_mode, 1126 StaticLookupMode static_mode, 1127 PrivateLookupMode private_mode) const; 1128 static Method* find_method_impl(Array<Method*>* methods, 1129 Symbol* name, Symbol* signature, 1130 OverpassLookupMode overpass_mode, 1131 StaticLookupMode static_mode, 1132 PrivateLookupMode private_mode); 1133 1134 // Free CHeap allocated fields. 1135 void release_C_heap_structures(); 1136 1137 // RedefineClasses support 1138 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1139 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1140 public: 1141 // CDS support - remove and restore oops from metadata. Oops are not shared. 1142 virtual void remove_unshareable_info(); 1143 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 1144 1145 // jvm support 1146 jint compute_modifier_flags(TRAPS) const; 1147 1148 // JSR-292 support 1149 MemberNameTable* member_names() { return _member_names; } 1150 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; } 1151 oop add_member_name(Handle member_name, bool intern); 1152 1153 public: 1154 // JVMTI support 1155 jint jvmti_class_status() const; 1156 1157 public: 1158 // Printing 1159 #ifndef PRODUCT 1160 void print_on(outputStream* st) const; 1161 #endif 1162 void print_value_on(outputStream* st) const; 1163 1164 void oop_print_value_on(oop obj, outputStream* st); 1165 1166 #ifndef PRODUCT 1167 void oop_print_on (oop obj, outputStream* st); 1168 1169 void print_dependent_nmethods(bool verbose = false); 1170 bool is_dependent_nmethod(nmethod* nm); 1171 #endif 1172 1173 const char* internal_name() const; 1174 1175 // Verification 1176 void verify_on(outputStream* st); 1177 1178 void oop_verify_on(oop obj, outputStream* st); 1179 }; 1180 1181 inline Method* InstanceKlass::method_at_vtable(int index) { 1182 #ifndef PRODUCT 1183 assert(index >= 0, "valid vtable index"); 1184 if (DebugVtables) { 1185 verify_vtable_index(index); 1186 } 1187 #endif 1188 vtableEntry* ve = (vtableEntry*)start_of_vtable(); 1189 return ve[index].method(); 1190 } 1191 1192 // for adding methods 1193 // UNSET_IDNUM return means no more ids available 1194 inline u2 InstanceKlass::next_method_idnum() { 1195 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1196 return ConstMethod::UNSET_IDNUM; // no more ids available 1197 } else { 1198 return _idnum_allocated_count++; 1199 } 1200 } 1201 1202 1203 /* JNIid class for jfieldIDs only */ 1204 class JNIid: public CHeapObj<mtClass> { 1205 friend class VMStructs; 1206 private: 1207 Klass* _holder; 1208 JNIid* _next; 1209 int _offset; 1210 #ifdef ASSERT 1211 bool _is_static_field_id; 1212 #endif 1213 1214 public: 1215 // Accessors 1216 Klass* holder() const { return _holder; } 1217 int offset() const { return _offset; } 1218 JNIid* next() { return _next; } 1219 // Constructor 1220 JNIid(Klass* holder, int offset, JNIid* next); 1221 // Identifier lookup 1222 JNIid* find(int offset); 1223 1224 bool find_local_field(fieldDescriptor* fd) { 1225 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1226 } 1227 1228 static void deallocate(JNIid* id); 1229 // Debugging 1230 #ifdef ASSERT 1231 bool is_static_field_id() const { return _is_static_field_id; } 1232 void set_is_static_field_id() { _is_static_field_id = true; } 1233 #endif 1234 void verify(Klass* holder); 1235 }; 1236 1237 1238 // 1239 // nmethodBucket is used to record dependent nmethods for 1240 // deoptimization. nmethod dependencies are actually <klass, method> 1241 // pairs but we really only care about the klass part for purposes of 1242 // finding nmethods which might need to be deoptimized. Instead of 1243 // recording the method, a count of how many times a particular nmethod 1244 // was recorded is kept. This ensures that any recording errors are 1245 // noticed since an nmethod should be removed as many times are it's 1246 // added. 1247 // 1248 class nmethodBucket: public CHeapObj<mtClass> { 1249 friend class VMStructs; 1250 private: 1251 nmethod* _nmethod; 1252 int _count; 1253 nmethodBucket* _next; 1254 1255 public: 1256 nmethodBucket(nmethod* nmethod, nmethodBucket* next) { 1257 _nmethod = nmethod; 1258 _next = next; 1259 _count = 1; 1260 } 1261 int count() { return _count; } 1262 int increment() { _count += 1; return _count; } 1263 int decrement(); 1264 nmethodBucket* next() { return _next; } 1265 void set_next(nmethodBucket* b) { _next = b; } 1266 nmethod* get_nmethod() { return _nmethod; } 1267 }; 1268 1269 // An iterator that's used to access the inner classes indices in the 1270 // InstanceKlass::_inner_classes array. 1271 class InnerClassesIterator : public StackObj { 1272 private: 1273 Array<jushort>* _inner_classes; 1274 int _length; 1275 int _idx; 1276 public: 1277 1278 InnerClassesIterator(instanceKlassHandle k) { 1279 _inner_classes = k->inner_classes(); 1280 if (k->inner_classes() != NULL) { 1281 _length = _inner_classes->length(); 1282 // The inner class array's length should be the multiple of 1283 // inner_class_next_offset if it only contains the InnerClasses 1284 // attribute data, or it should be 1285 // n*inner_class_next_offset+enclosing_method_attribute_size 1286 // if it also contains the EnclosingMethod data. 1287 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1288 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1289 "just checking"); 1290 // Remove the enclosing_method portion if exists. 1291 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1292 _length -= InstanceKlass::enclosing_method_attribute_size; 1293 } 1294 } else { 1295 _length = 0; 1296 } 1297 _idx = 0; 1298 } 1299 1300 int length() const { 1301 return _length; 1302 } 1303 1304 void next() { 1305 _idx += InstanceKlass::inner_class_next_offset; 1306 } 1307 1308 bool done() const { 1309 return (_idx >= _length); 1310 } 1311 1312 u2 inner_class_info_index() const { 1313 return _inner_classes->at( 1314 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1315 } 1316 1317 void set_inner_class_info_index(u2 index) { 1318 _inner_classes->at_put( 1319 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1320 } 1321 1322 u2 outer_class_info_index() const { 1323 return _inner_classes->at( 1324 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1325 } 1326 1327 void set_outer_class_info_index(u2 index) { 1328 _inner_classes->at_put( 1329 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1330 } 1331 1332 u2 inner_name_index() const { 1333 return _inner_classes->at( 1334 _idx + InstanceKlass::inner_class_inner_name_offset); 1335 } 1336 1337 void set_inner_name_index(u2 index) { 1338 _inner_classes->at_put( 1339 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1340 } 1341 1342 u2 inner_access_flags() const { 1343 return _inner_classes->at( 1344 _idx + InstanceKlass::inner_class_access_flags_offset); 1345 } 1346 }; 1347 1348 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP