1 /* 2 * Copyright (c) 1997, 2013, 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 PreviousVersionNode; 92 class JvmtiCachedClassFieldMap; 93 class MemberNameTable; 94 95 // This is used in iterators below. 96 class FieldClosure: public StackObj { 97 public: 98 virtual void do_field(fieldDescriptor* fd) = 0; 99 }; 100 101 #ifndef PRODUCT 102 // Print fields. 103 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. 104 class FieldPrinter: public FieldClosure { 105 oop _obj; 106 outputStream* _st; 107 public: 108 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} 109 void do_field(fieldDescriptor* fd); 110 }; 111 #endif // !PRODUCT 112 113 // ValueObjs embedded in klass. Describes where oops are located in instances of 114 // this klass. 115 class OopMapBlock VALUE_OBJ_CLASS_SPEC { 116 public: 117 // Byte offset of the first oop mapped by this block. 118 int offset() const { return _offset; } 119 void set_offset(int offset) { _offset = offset; } 120 121 // Number of oops in this block. 122 uint count() const { return _count; } 123 void set_count(uint count) { _count = count; } 124 125 // sizeof(OopMapBlock) in HeapWords. 126 static const int size_in_words() { 127 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >> 128 LogHeapWordSize; 129 } 130 131 private: 132 int _offset; 133 uint _count; 134 }; 135 136 struct JvmtiCachedClassFileData; 137 138 class InstanceKlass: public Klass { 139 friend class VMStructs; 140 friend class ClassFileParser; 141 friend class CompileReplay; 142 143 protected: 144 // Constructor 145 InstanceKlass(int vtable_len, 146 int itable_len, 147 int static_field_size, 148 int nonstatic_oop_map_size, 149 ReferenceType rt, 150 AccessFlags access_flags, 151 bool is_anonymous); 152 public: 153 static InstanceKlass* allocate_instance_klass( 154 ClassLoaderData* loader_data, 155 int vtable_len, 156 int itable_len, 157 int static_field_size, 158 int nonstatic_oop_map_size, 159 ReferenceType rt, 160 AccessFlags access_flags, 161 Symbol* name, 162 Klass* super_klass, 163 bool is_anonymous, 164 TRAPS); 165 166 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } 167 168 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 169 // of the class loading & initialization procedure, and the use of the states. 170 enum ClassState { 171 allocated, // allocated (but not yet linked) 172 loaded, // loaded and inserted in class hierarchy (but not linked yet) 173 linked, // successfully linked/verified (but not initialized yet) 174 being_initialized, // currently running class initializer 175 fully_initialized, // initialized (successfull final state) 176 initialization_error // error happened during initialization 177 }; 178 179 static int number_of_instance_classes() { return _total_instanceKlass_count; } 180 181 private: 182 static volatile int _total_instanceKlass_count; 183 184 protected: 185 // Annotations for this class 186 Annotations* _annotations; 187 // Array classes holding elements of this class. 188 Klass* _array_klasses; 189 // Constant pool for this class. 190 ConstantPool* _constants; 191 // The InnerClasses attribute and EnclosingMethod attribute. The 192 // _inner_classes is an array of shorts. If the class has InnerClasses 193 // attribute, then the _inner_classes array begins with 4-tuples of shorts 194 // [inner_class_info_index, outer_class_info_index, 195 // inner_name_index, inner_class_access_flags] for the InnerClasses 196 // attribute. If the EnclosingMethod attribute exists, it occupies the 197 // last two shorts [class_index, method_index] of the array. If only 198 // the InnerClasses attribute exists, the _inner_classes array length is 199 // number_of_inner_classes * 4. If the class has both InnerClasses 200 // and EnclosingMethod attributes the _inner_classes array length is 201 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 202 Array<jushort>* _inner_classes; 203 204 // the source debug extension for this klass, NULL if not specified. 205 // Specified as UTF-8 string without terminating zero byte in the classfile, 206 // it is stored in the instanceklass as a NULL-terminated UTF-8 string 207 char* _source_debug_extension; 208 // Array name derived from this class which needs unreferencing 209 // if this class is unloaded. 210 Symbol* _array_name; 211 212 // Number of heapOopSize words used by non-static fields in this klass 213 // (including inherited fields but after header_size()). 214 int _nonstatic_field_size; 215 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 216 // Constant pool index to the utf8 entry of the Generic signature, 217 // or 0 if none. 218 u2 _generic_signature_index; 219 // Constant pool index to the utf8 entry for the name of source file 220 // containing this klass, 0 if not specified. 221 u2 _source_file_name_index; 222 u2 _static_oop_field_count;// number of static oop fields in this klass 223 u2 _java_fields_count; // The number of declared Java fields 224 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 225 226 // _is_marked_dependent can be set concurrently, thus cannot be part of the 227 // _misc_flags. 228 bool _is_marked_dependent; // used for marking during flushing and deoptimization 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 }; 238 u2 _misc_flags; 239 u2 _minor_version; // minor version number of class file 240 u2 _major_version; // major version number of class file 241 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) 242 int _vtable_len; // length of Java vtable (in words) 243 int _itable_len; // length of Java itable (in words) 244 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 245 MemberNameTable* _member_names; // Member names 246 JNIid* _jni_ids; // First JNI identifier for static fields in this class 247 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 248 nmethodBucket* _dependencies; // list of dependent nmethods 249 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 250 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 251 // Array of interesting part(s) of the previous version(s) of this 252 // InstanceKlass. See PreviousVersionWalker below. 253 GrowableArray<PreviousVersionNode *>* _previous_versions; 254 // JVMTI fields can be moved to their own structure - see 6315920 255 // JVMTI: cached class file, before retransformable agent modified it in CFLH 256 JvmtiCachedClassFileData* _cached_class_file; 257 258 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 259 260 // Class states are defined as ClassState (see above). 261 // Place the _init_state here to utilize the unused 2-byte after 262 // _idnum_allocated_count. 263 u1 _init_state; // state of class 264 u1 _reference_type; // reference type 265 266 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 267 268 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 269 270 // Method array. 271 Array<Method*>* _methods; 272 // Default Method Array, concrete methods inherited from interfaces 273 Array<Method*>* _default_methods; 274 // Interface (Klass*s) this class declares locally to implement. 275 Array<Klass*>* _local_interfaces; 276 // Interface (Klass*s) this class implements transitively. 277 Array<Klass*>* _transitive_interfaces; 278 // Int array containing the original order of method in the class file (for JVMTI). 279 Array<int>* _method_ordering; 280 // Int array containing the vtable_indices for default_methods 281 // offset matches _default_methods offset 282 Array<int>* _default_vtable_indices; 283 284 // Instance and static variable information, starts with 6-tuples of shorts 285 // [access, name index, sig index, initval index, low_offset, high_offset] 286 // for all fields, followed by the generic signature data at the end of 287 // the array. Only fields with generic signature attributes have the generic 288 // signature data set in the array. The fields array looks like following: 289 // 290 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 291 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 292 // ... 293 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 294 // [generic signature index] 295 // [generic signature index] 296 // ... 297 Array<u2>* _fields; 298 299 // embedded Java vtable follows here 300 // embedded Java itables follows here 301 // embedded static fields follows here 302 // embedded nonstatic oop-map blocks follows here 303 // embedded implementor of this interface follows here 304 // The embedded implementor only exists if the current klass is an 305 // iterface. The possible values of the implementor fall into following 306 // three cases: 307 // NULL: no implementor. 308 // A Klass* that's not itself: one implementor. 309 // Itsef: more than one implementors. 310 // embedded host klass follows here 311 // The embedded host klass only exists in an anonymous class for 312 // dynamic language support (JSR 292 enabled). The host class grants 313 // its access privileges to this class also. The host class is either 314 // named, or a previously loaded anonymous class. A non-anonymous class 315 // or an anonymous class loaded through normal classloading does not 316 // have this embedded field. 317 // 318 319 friend class SystemDictionary; 320 321 public: 322 bool has_nonstatic_fields() const { 323 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 324 } 325 void set_has_nonstatic_fields(bool b) { 326 if (b) { 327 _misc_flags |= _misc_has_nonstatic_fields; 328 } else { 329 _misc_flags &= ~_misc_has_nonstatic_fields; 330 } 331 } 332 333 // field sizes 334 int nonstatic_field_size() const { return _nonstatic_field_size; } 335 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 336 337 int static_field_size() const { return _static_field_size; } 338 void set_static_field_size(int size) { _static_field_size = size; } 339 340 int static_oop_field_count() const { return (int)_static_oop_field_count; } 341 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 342 343 // Java vtable 344 int vtable_length() const { return _vtable_len; } 345 void set_vtable_length(int len) { _vtable_len = len; } 346 347 // Java itable 348 int itable_length() const { return _itable_len; } 349 void set_itable_length(int len) { _itable_len = len; } 350 351 // array klasses 352 Klass* array_klasses() const { return _array_klasses; } 353 void set_array_klasses(Klass* k) { _array_klasses = k; } 354 355 // methods 356 Array<Method*>* methods() const { return _methods; } 357 void set_methods(Array<Method*>* a) { _methods = a; } 358 Method* method_with_idnum(int idnum); 359 360 // method ordering 361 Array<int>* method_ordering() const { return _method_ordering; } 362 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 363 void copy_method_ordering(intArray* m, TRAPS); 364 365 // default_methods 366 Array<Method*>* default_methods() const { return _default_methods; } 367 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 368 369 // default method vtable_indices 370 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 371 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 372 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 373 374 // interfaces 375 Array<Klass*>* local_interfaces() const { return _local_interfaces; } 376 void set_local_interfaces(Array<Klass*>* a) { 377 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 378 _local_interfaces = a; } 379 380 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; } 381 void set_transitive_interfaces(Array<Klass*>* a) { 382 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 383 _transitive_interfaces = a; 384 } 385 386 private: 387 friend class fieldDescriptor; 388 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 389 390 public: 391 int field_offset (int index) const { return field(index)->offset(); } 392 int field_access_flags(int index) const { return field(index)->access_flags(); } 393 Symbol* field_name (int index) const { return field(index)->name(constants()); } 394 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 395 396 // Number of Java declared fields 397 int java_fields_count() const { return (int)_java_fields_count; } 398 399 Array<u2>* fields() const { return _fields; } 400 void set_fields(Array<u2>* f, u2 java_fields_count) { 401 guarantee(_fields == NULL || f == NULL, "Just checking"); 402 _fields = f; 403 _java_fields_count = java_fields_count; 404 } 405 406 // inner classes 407 Array<u2>* inner_classes() const { return _inner_classes; } 408 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 409 410 enum InnerClassAttributeOffset { 411 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 412 inner_class_inner_class_info_offset = 0, 413 inner_class_outer_class_info_offset = 1, 414 inner_class_inner_name_offset = 2, 415 inner_class_access_flags_offset = 3, 416 inner_class_next_offset = 4 417 }; 418 419 enum EnclosingMethodAttributeOffset { 420 enclosing_method_class_index_offset = 0, 421 enclosing_method_method_index_offset = 1, 422 enclosing_method_attribute_size = 2 423 }; 424 425 // method override check 426 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 427 428 // package 429 bool is_same_class_package(Klass* class2); 430 bool is_same_class_package(oop classloader2, Symbol* classname2); 431 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2); 432 433 // find an enclosing class (defined where original code was, in jvm.cpp!) 434 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) { 435 instanceKlassHandle self(THREAD, this); 436 return compute_enclosing_class_impl(self, inner_is_member, THREAD); 437 } 438 static Klass* compute_enclosing_class_impl(instanceKlassHandle self, 439 bool* inner_is_member, TRAPS); 440 441 // tell if two classes have the same enclosing class (at package level) 442 bool is_same_package_member(Klass* class2, TRAPS) { 443 instanceKlassHandle self(THREAD, this); 444 return is_same_package_member_impl(self, class2, THREAD); 445 } 446 static bool is_same_package_member_impl(instanceKlassHandle self, 447 Klass* class2, TRAPS); 448 449 // initialization state 450 bool is_loaded() const { return _init_state >= loaded; } 451 bool is_linked() const { return _init_state >= linked; } 452 bool is_initialized() const { return _init_state == fully_initialized; } 453 bool is_not_initialized() const { return _init_state < being_initialized; } 454 bool is_being_initialized() const { return _init_state == being_initialized; } 455 bool is_in_error_state() const { return _init_state == initialization_error; } 456 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 457 ClassState init_state() { return (ClassState)_init_state; } 458 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 459 460 // defineClass specified verification 461 bool should_verify_class() const { 462 return (_misc_flags & _misc_should_verify_class) != 0; 463 } 464 void set_should_verify_class(bool value) { 465 if (value) { 466 _misc_flags |= _misc_should_verify_class; 467 } else { 468 _misc_flags &= ~_misc_should_verify_class; 469 } 470 } 471 472 // marking 473 bool is_marked_dependent() const { return _is_marked_dependent; } 474 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 475 476 // initialization (virtuals from Klass) 477 bool should_be_initialized() const; // means that initialize should be called 478 void initialize(TRAPS); 479 void link_class(TRAPS); 480 bool link_class_or_fail(TRAPS); // returns false on failure 481 void unlink_class(); 482 void rewrite_class(TRAPS); 483 void link_methods(TRAPS); 484 Method* class_initializer(); 485 486 // set the class to initialized if no static initializer is present 487 void eager_initialize(Thread *thread); 488 489 // reference type 490 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 491 void set_reference_type(ReferenceType t) { 492 assert(t == (u1)t, "overflow"); 493 _reference_type = (u1)t; 494 } 495 496 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 497 498 // find local field, returns true if found 499 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 500 // find field in direct superinterfaces, returns the interface in which the field is defined 501 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 502 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 503 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 504 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 505 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 506 507 // find a non-static or static field given its offset within the class. 508 bool contains_field_offset(int offset) { 509 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); 510 } 511 512 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 513 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 514 515 // find a local method (returns NULL if not found) 516 Method* find_method(Symbol* name, Symbol* signature) const; 517 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature); 518 static Method* find_instance_method(Array<Method*>* methods, Symbol* name, Symbol* signature); 519 520 // find a local method index in default_methods (returns -1 if not found) 521 static int find_method_index(Array<Method*>* methods, Symbol* name, Symbol* signature); 522 523 // lookup operation (returns NULL if not found) 524 Method* uncached_lookup_method(Symbol* name, Symbol* signature) const; 525 526 // lookup a method in all the interfaces that this class implements 527 // (returns NULL if not found) 528 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const; 529 // lookup a method in local defaults then in all interfaces 530 // (returns NULL if not found) 531 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 532 533 // Find method indices by name. If a method with the specified name is 534 // found the index to the first method is returned, and 'end' is filled in 535 // with the index of first non-name-matching method. If no method is found 536 // -1 is returned. 537 int find_method_by_name(Symbol* name, int* end); 538 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end); 539 540 // constant pool 541 ConstantPool* constants() const { return _constants; } 542 void set_constants(ConstantPool* c) { _constants = c; } 543 544 // protection domain 545 oop protection_domain() const; 546 547 // signers 548 objArrayOop signers() const; 549 550 // host class 551 Klass* host_klass() const { 552 Klass** hk = (Klass**)adr_host_klass(); 553 if (hk == NULL) { 554 return NULL; 555 } else { 556 return *hk; 557 } 558 } 559 void set_host_klass(Klass* host) { 560 assert(is_anonymous(), "not anonymous"); 561 Klass** addr = (Klass**)adr_host_klass(); 562 assert(addr != NULL, "no reversed space"); 563 if (addr != NULL) { 564 *addr = host; 565 } 566 } 567 bool is_anonymous() const { 568 return (_misc_flags & _misc_is_anonymous) != 0; 569 } 570 void set_is_anonymous(bool value) { 571 if (value) { 572 _misc_flags |= _misc_is_anonymous; 573 } else { 574 _misc_flags &= ~_misc_is_anonymous; 575 } 576 } 577 578 // Oop that keeps the metadata for this class from being unloaded 579 // in places where the metadata is stored in other places, like nmethods 580 oop klass_holder() const { 581 return is_anonymous() ? java_mirror() : class_loader(); 582 } 583 584 bool is_contended() const { 585 return (_misc_flags & _misc_is_contended) != 0; 586 } 587 void set_is_contended(bool value) { 588 if (value) { 589 _misc_flags |= _misc_is_contended; 590 } else { 591 _misc_flags &= ~_misc_is_contended; 592 } 593 } 594 595 // source file name 596 Symbol* source_file_name() const { 597 return (_source_file_name_index == 0) ? 598 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index); 599 } 600 u2 source_file_name_index() const { 601 return _source_file_name_index; 602 } 603 void set_source_file_name_index(u2 sourcefile_index) { 604 _source_file_name_index = sourcefile_index; 605 } 606 607 // minor and major version numbers of class file 608 u2 minor_version() const { return _minor_version; } 609 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 610 u2 major_version() const { return _major_version; } 611 void set_major_version(u2 major_version) { _major_version = major_version; } 612 613 // source debug extension 614 char* source_debug_extension() const { return _source_debug_extension; } 615 void set_source_debug_extension(char* array, int length); 616 617 // symbol unloading support (refcount already added) 618 Symbol* array_name() { return _array_name; } 619 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; } 620 621 // nonstatic oop-map blocks 622 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 623 return oop_map_count * OopMapBlock::size_in_words(); 624 } 625 unsigned int nonstatic_oop_map_count() const { 626 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 627 } 628 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 629 void set_nonstatic_oop_map_size(int words) { 630 _nonstatic_oop_map_size = words; 631 } 632 633 // RedefineClasses() support for previous versions: 634 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods, 635 int emcp_method_count); 636 // If the _previous_versions array is non-NULL, then this klass 637 // has been redefined at least once even if we aren't currently 638 // tracking a previous version. 639 bool has_been_redefined() const { return _previous_versions != NULL; } 640 bool has_previous_version() const; 641 void init_previous_versions() { 642 _previous_versions = NULL; 643 } 644 GrowableArray<PreviousVersionNode *>* previous_versions() const { 645 return _previous_versions; 646 } 647 648 static void purge_previous_versions(InstanceKlass* ik); 649 650 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 651 void set_cached_class_file(JvmtiCachedClassFileData *data) { 652 _cached_class_file = data; 653 } 654 JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; } 655 jint get_cached_class_file_len(); 656 unsigned char * get_cached_class_file_bytes(); 657 658 // JVMTI: Support for caching of field indices, types, and offsets 659 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 660 _jvmti_cached_class_field_map = descriptor; 661 } 662 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 663 return _jvmti_cached_class_field_map; 664 } 665 666 bool has_default_methods() const { 667 return (_misc_flags & _misc_has_default_methods) != 0; 668 } 669 void set_has_default_methods(bool b) { 670 if (b) { 671 _misc_flags |= _misc_has_default_methods; 672 } else { 673 _misc_flags &= ~_misc_has_default_methods; 674 } 675 } 676 677 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 678 inline u2 next_method_idnum(); 679 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 680 681 // generics support 682 Symbol* generic_signature() const { 683 return (_generic_signature_index == 0) ? 684 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index); 685 } 686 u2 generic_signature_index() const { 687 return _generic_signature_index; 688 } 689 void set_generic_signature_index(u2 sig_index) { 690 _generic_signature_index = sig_index; 691 } 692 693 u2 enclosing_method_data(int offset); 694 u2 enclosing_method_class_index() { 695 return enclosing_method_data(enclosing_method_class_index_offset); 696 } 697 u2 enclosing_method_method_index() { 698 return enclosing_method_data(enclosing_method_method_index_offset); 699 } 700 void set_enclosing_method_indices(u2 class_index, 701 u2 method_index); 702 703 // jmethodID support 704 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, 705 methodHandle method_h); 706 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h, 707 size_t idnum, jmethodID new_id, jmethodID* new_jmeths, 708 jmethodID* to_dealloc_id_p, 709 jmethodID** to_dealloc_jmeths_p); 710 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 711 size_t *length_p, jmethodID* id_p); 712 jmethodID jmethod_id_or_null(Method* method); 713 714 // annotations support 715 Annotations* annotations() const { return _annotations; } 716 void set_annotations(Annotations* anno) { _annotations = anno; } 717 718 AnnotationArray* class_annotations() const { 719 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 720 } 721 Array<AnnotationArray*>* fields_annotations() const { 722 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 723 } 724 AnnotationArray* class_type_annotations() const { 725 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 726 } 727 Array<AnnotationArray*>* fields_type_annotations() const { 728 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 729 } 730 // allocation 731 instanceOop allocate_instance(TRAPS); 732 733 // additional member function to return a handle 734 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } 735 736 objArrayOop allocate_objArray(int n, int length, TRAPS); 737 // Helper function 738 static instanceOop register_finalizer(instanceOop i, TRAPS); 739 740 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 741 // if not, throw either an Error or an Exception. 742 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 743 744 // initialization 745 void call_class_initializer(TRAPS); 746 void set_initialization_state_and_notify(ClassState state, TRAPS); 747 748 // OopMapCache support 749 OopMapCache* oop_map_cache() { return _oop_map_cache; } 750 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 751 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry); 752 753 // JNI identifier support (for static fields - for jni performance) 754 JNIid* jni_ids() { return _jni_ids; } 755 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 756 JNIid* jni_id_for(int offset); 757 758 // maintenance of deoptimization dependencies 759 int mark_dependent_nmethods(DepChange& changes); 760 void add_dependent_nmethod(nmethod* nm); 761 void remove_dependent_nmethod(nmethod* nm); 762 763 // On-stack replacement support 764 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 765 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 766 void add_osr_nmethod(nmethod* n); 767 void remove_osr_nmethod(nmethod* n); 768 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 769 770 // Breakpoint support (see methods on Method* for details) 771 BreakpointInfo* breakpoints() const { return _breakpoints; }; 772 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 773 774 // support for stub routines 775 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 776 TRACE_DEFINE_OFFSET; 777 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 778 779 // subclass/subinterface checks 780 bool implements_interface(Klass* k) const; 781 bool is_same_or_direct_interface(Klass* k) const; 782 783 // Access to the implementor of an interface. 784 Klass* implementor() const 785 { 786 Klass** k = adr_implementor(); 787 if (k == NULL) { 788 return NULL; 789 } else { 790 return *k; 791 } 792 } 793 794 void set_implementor(Klass* k) { 795 assert(is_interface(), "not interface"); 796 Klass** addr = adr_implementor(); 797 assert(addr != NULL, "null addr"); 798 if (addr != NULL) { 799 *addr = k; 800 } 801 } 802 803 int nof_implementors() const { 804 Klass* k = implementor(); 805 if (k == NULL) { 806 return 0; 807 } else if (k != this) { 808 return 1; 809 } else { 810 return 2; 811 } 812 } 813 814 void add_implementor(Klass* k); // k is a new class that implements this interface 815 void init_implementor(); // initialize 816 817 // link this class into the implementors list of every interface it implements 818 void process_interfaces(Thread *thread); 819 820 // virtual operations from Klass 821 bool is_leaf_class() const { return _subklass == NULL; } 822 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); 823 bool compute_is_subtype_of(Klass* k); 824 bool can_be_primary_super_slow() const; 825 int oop_size(oop obj) const { return size_helper(); } 826 bool oop_is_instance_slow() const { return true; } 827 828 // Iterators 829 void do_local_static_fields(FieldClosure* cl); 830 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 831 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS); 832 833 void methods_do(void f(Method* method)); 834 void array_klasses_do(void f(Klass* k)); 835 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 836 bool super_types_do(SuperTypeClosure* blk); 837 838 // Casting from Klass* 839 static InstanceKlass* cast(Klass* k) { 840 assert(k->is_klass(), "must be"); 841 assert(k->oop_is_instance(), "cast to InstanceKlass"); 842 return (InstanceKlass*) k; 843 } 844 845 InstanceKlass* java_super() const { 846 return (super() == NULL) ? NULL : cast(super()); 847 } 848 849 // Sizing (in words) 850 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); } 851 852 static int size(int vtable_length, int itable_length, 853 int nonstatic_oop_map_size, 854 bool is_interface, bool is_anonymous) { 855 return align_object_size(header_size() + 856 align_object_offset(vtable_length) + 857 align_object_offset(itable_length) + 858 ((is_interface || is_anonymous) ? 859 align_object_offset(nonstatic_oop_map_size) : 860 nonstatic_oop_map_size) + 861 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) + 862 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0)); 863 } 864 int size() const { return size(vtable_length(), 865 itable_length(), 866 nonstatic_oop_map_size(), 867 is_interface(), 868 is_anonymous()); 869 } 870 #if INCLUDE_SERVICES 871 virtual void collect_statistics(KlassSizeStats *sz) const; 872 #endif 873 874 static int vtable_start_offset() { return header_size(); } 875 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; } 876 877 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); } 878 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); } 879 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 880 881 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 882 883 address static_field_addr(int offset); 884 885 OopMapBlock* start_of_nonstatic_oop_maps() const { 886 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length())); 887 } 888 889 Klass** end_of_nonstatic_oop_maps() const { 890 return (Klass**)(start_of_nonstatic_oop_maps() + 891 nonstatic_oop_map_count()); 892 } 893 894 Klass** adr_implementor() const { 895 if (is_interface()) { 896 return (Klass**)end_of_nonstatic_oop_maps(); 897 } else { 898 return NULL; 899 } 900 }; 901 902 Klass** adr_host_klass() const { 903 if (is_anonymous()) { 904 Klass** adr_impl = adr_implementor(); 905 if (adr_impl != NULL) { 906 return adr_impl + 1; 907 } else { 908 return end_of_nonstatic_oop_maps(); 909 } 910 } else { 911 return NULL; 912 } 913 } 914 915 // Use this to return the size of an instance in heap words: 916 int size_helper() const { 917 return layout_helper_to_size_helper(layout_helper()); 918 } 919 920 // This bit is initialized in classFileParser.cpp. 921 // It is false under any of the following conditions: 922 // - the class is abstract (including any interface) 923 // - the class has a finalizer (if !RegisterFinalizersAtInit) 924 // - the class size is larger than FastAllocateSizeLimit 925 // - the class is java/lang/Class, which cannot be allocated directly 926 bool can_be_fastpath_allocated() const { 927 return !layout_helper_needs_slow_path(layout_helper()); 928 } 929 930 // Java vtable/itable 931 klassVtable* vtable() const; // return new klassVtable wrapper 932 inline Method* method_at_vtable(int index); 933 klassItable* itable() const; // return new klassItable wrapper 934 Method* method_at_itable(Klass* holder, int index, TRAPS); 935 936 #if INCLUDE_JVMTI 937 void adjust_default_methods(Method** old_methods, Method** new_methods, 938 int methods_length, bool* trace_name_printed); 939 #endif // INCLUDE_JVMTI 940 941 // Garbage collection 942 void oop_follow_contents(oop obj); 943 int oop_adjust_pointers(oop obj); 944 945 void clean_implementors_list(BoolObjectClosure* is_alive); 946 void clean_method_data(BoolObjectClosure* is_alive); 947 948 // Explicit metaspace deallocation of fields 949 // For RedefineClasses and class file parsing errors, we need to deallocate 950 // instanceKlasses and the metadata they point to. 951 void deallocate_contents(ClassLoaderData* loader_data); 952 static void deallocate_methods(ClassLoaderData* loader_data, 953 Array<Method*>* methods); 954 void static deallocate_interfaces(ClassLoaderData* loader_data, 955 Klass* super_klass, 956 Array<Klass*>* local_interfaces, 957 Array<Klass*>* transitive_interfaces); 958 959 // The constant pool is on stack if any of the methods are executing or 960 // referenced by handles. 961 bool on_stack() const { return _constants->on_stack(); } 962 963 // callbacks for actions during class unloading 964 static void notify_unload_class(InstanceKlass* ik); 965 static void release_C_heap_structures(InstanceKlass* ik); 966 967 // Parallel Scavenge and Parallel Old 968 PARALLEL_GC_DECLS 969 970 // Naming 971 const char* signature_name() const; 972 973 // Iterators 974 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) { 975 return oop_oop_iterate_v(obj, blk); 976 } 977 978 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) { 979 return oop_oop_iterate_v_m(obj, blk, mr); 980 } 981 982 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ 983 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ 984 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \ 985 MemRegion mr); 986 987 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL) 988 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL) 989 990 #if INCLUDE_ALL_GCS 991 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ 992 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); 993 994 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 995 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 996 #endif // INCLUDE_ALL_GCS 997 998 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 999 1000 private: 1001 // initialization state 1002 #ifdef ASSERT 1003 void set_init_state(ClassState state); 1004 #else 1005 void set_init_state(ClassState state) { _init_state = (u1)state; } 1006 #endif 1007 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1008 void set_init_thread(Thread *thread) { _init_thread = thread; } 1009 1010 // The RedefineClasses() API can cause new method idnums to be needed 1011 // which will cause the caches to grow. Safety requires different 1012 // cache management logic if the caches can grow instead of just 1013 // going from NULL to non-NULL. 1014 bool idnum_can_increment() const { return has_been_redefined(); } 1015 jmethodID* methods_jmethod_ids_acquire() const 1016 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); } 1017 void release_set_methods_jmethod_ids(jmethodID* jmeths) 1018 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); } 1019 1020 // Lock during initialization 1021 public: 1022 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1023 // Must be one per class and it has to be a VM internal object so java code 1024 // cannot lock it (like the mirror). 1025 // It has to be an object not a Mutex because it's held through java calls. 1026 oop init_lock() const; 1027 private: 1028 void fence_and_clear_init_lock(); 1029 1030 // Static methods that are used to implement member methods where an exposed this pointer 1031 // is needed due to possible GCs 1032 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); 1033 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); 1034 static void initialize_impl (instanceKlassHandle this_oop, TRAPS); 1035 static void eager_initialize_impl (instanceKlassHandle this_oop); 1036 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS); 1037 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS); 1038 static Klass* array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS); 1039 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS); 1040 /* jni_id_for_impl for jfieldID only */ 1041 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset); 1042 1043 // Returns the array class for the n'th dimension 1044 Klass* array_klass_impl(bool or_null, int n, TRAPS); 1045 1046 // Returns the array class with this class as element type 1047 Klass* array_klass_impl(bool or_null, TRAPS); 1048 1049 // Free CHeap allocated fields. 1050 void release_C_heap_structures(); 1051 public: 1052 // CDS support - remove and restore oops from metadata. Oops are not shared. 1053 virtual void remove_unshareable_info(); 1054 virtual void restore_unshareable_info(TRAPS); 1055 1056 // jvm support 1057 jint compute_modifier_flags(TRAPS) const; 1058 1059 // JSR-292 support 1060 MemberNameTable* member_names() { return _member_names; } 1061 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; } 1062 void add_member_name(int index, Handle member_name); 1063 oop get_member_name(int index); 1064 1065 public: 1066 // JVMTI support 1067 jint jvmti_class_status() const; 1068 1069 public: 1070 // Printing 1071 #ifndef PRODUCT 1072 void print_on(outputStream* st) const; 1073 #endif 1074 void print_value_on(outputStream* st) const; 1075 1076 void oop_print_value_on(oop obj, outputStream* st); 1077 1078 #ifndef PRODUCT 1079 void oop_print_on (oop obj, outputStream* st); 1080 1081 void print_dependent_nmethods(bool verbose = false); 1082 bool is_dependent_nmethod(nmethod* nm); 1083 #endif 1084 1085 const char* internal_name() const; 1086 1087 // Verification 1088 void verify_on(outputStream* st, bool check_dictionary); 1089 1090 void oop_verify_on(oop obj, outputStream* st); 1091 }; 1092 1093 inline Method* InstanceKlass::method_at_vtable(int index) { 1094 #ifndef PRODUCT 1095 assert(index >= 0, "valid vtable index"); 1096 if (DebugVtables) { 1097 verify_vtable_index(index); 1098 } 1099 #endif 1100 vtableEntry* ve = (vtableEntry*)start_of_vtable(); 1101 return ve[index].method(); 1102 } 1103 1104 // for adding methods 1105 // UNSET_IDNUM return means no more ids available 1106 inline u2 InstanceKlass::next_method_idnum() { 1107 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1108 return ConstMethod::UNSET_IDNUM; // no more ids available 1109 } else { 1110 return _idnum_allocated_count++; 1111 } 1112 } 1113 1114 1115 /* JNIid class for jfieldIDs only */ 1116 class JNIid: public CHeapObj<mtClass> { 1117 friend class VMStructs; 1118 private: 1119 Klass* _holder; 1120 JNIid* _next; 1121 int _offset; 1122 #ifdef ASSERT 1123 bool _is_static_field_id; 1124 #endif 1125 1126 public: 1127 // Accessors 1128 Klass* holder() const { return _holder; } 1129 int offset() const { return _offset; } 1130 JNIid* next() { return _next; } 1131 // Constructor 1132 JNIid(Klass* holder, int offset, JNIid* next); 1133 // Identifier lookup 1134 JNIid* find(int offset); 1135 1136 bool find_local_field(fieldDescriptor* fd) { 1137 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1138 } 1139 1140 static void deallocate(JNIid* id); 1141 // Debugging 1142 #ifdef ASSERT 1143 bool is_static_field_id() const { return _is_static_field_id; } 1144 void set_is_static_field_id() { _is_static_field_id = true; } 1145 #endif 1146 void verify(Klass* holder); 1147 }; 1148 1149 1150 // If breakpoints are more numerous than just JVMTI breakpoints, 1151 // consider compressing this data structure. 1152 // It is currently a simple linked list defined in method.hpp. 1153 1154 class BreakpointInfo; 1155 1156 1157 // A collection point for interesting information about the previous 1158 // version(s) of an InstanceKlass. A GrowableArray of PreviousVersionNodes 1159 // is attached to the InstanceKlass as needed. See PreviousVersionWalker below. 1160 class PreviousVersionNode : public CHeapObj<mtClass> { 1161 private: 1162 ConstantPool* _prev_constant_pool; 1163 1164 // If the previous version of the InstanceKlass doesn't have any 1165 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the 1166 // EMCP methods have been collected, then _prev_EMCP_methods can 1167 // have a length of zero. 1168 GrowableArray<Method*>* _prev_EMCP_methods; 1169 1170 public: 1171 PreviousVersionNode(ConstantPool* prev_constant_pool, 1172 GrowableArray<Method*>* prev_EMCP_methods); 1173 ~PreviousVersionNode(); 1174 ConstantPool* prev_constant_pool() const { 1175 return _prev_constant_pool; 1176 } 1177 GrowableArray<Method*>* prev_EMCP_methods() const { 1178 return _prev_EMCP_methods; 1179 } 1180 }; 1181 1182 1183 // Helper object for walking previous versions. 1184 class PreviousVersionWalker : public StackObj { 1185 private: 1186 Thread* _thread; 1187 GrowableArray<PreviousVersionNode *>* _previous_versions; 1188 int _current_index; 1189 1190 // A pointer to the current node object so we can handle the deletes. 1191 PreviousVersionNode* _current_p; 1192 1193 // The constant pool handle keeps all the methods in this class from being 1194 // deallocated from the metaspace during class unloading. 1195 constantPoolHandle _current_constant_pool_handle; 1196 1197 public: 1198 PreviousVersionWalker(Thread* thread, InstanceKlass *ik); 1199 1200 // Return the interesting information for the next previous version 1201 // of the klass. Returns NULL if there are no more previous versions. 1202 PreviousVersionNode* next_previous_version(); 1203 }; 1204 1205 1206 // 1207 // nmethodBucket is used to record dependent nmethods for 1208 // deoptimization. nmethod dependencies are actually <klass, method> 1209 // pairs but we really only care about the klass part for purposes of 1210 // finding nmethods which might need to be deoptimized. Instead of 1211 // recording the method, a count of how many times a particular nmethod 1212 // was recorded is kept. This ensures that any recording errors are 1213 // noticed since an nmethod should be removed as many times are it's 1214 // added. 1215 // 1216 class nmethodBucket: public CHeapObj<mtClass> { 1217 friend class VMStructs; 1218 private: 1219 nmethod* _nmethod; 1220 int _count; 1221 nmethodBucket* _next; 1222 1223 public: 1224 nmethodBucket(nmethod* nmethod, nmethodBucket* next) { 1225 _nmethod = nmethod; 1226 _next = next; 1227 _count = 1; 1228 } 1229 int count() { return _count; } 1230 int increment() { _count += 1; return _count; } 1231 int decrement() { _count -= 1; assert(_count >= 0, "don't underflow"); return _count; } 1232 nmethodBucket* next() { return _next; } 1233 void set_next(nmethodBucket* b) { _next = b; } 1234 nmethod* get_nmethod() { return _nmethod; } 1235 }; 1236 1237 // An iterator that's used to access the inner classes indices in the 1238 // InstanceKlass::_inner_classes array. 1239 class InnerClassesIterator : public StackObj { 1240 private: 1241 Array<jushort>* _inner_classes; 1242 int _length; 1243 int _idx; 1244 public: 1245 1246 InnerClassesIterator(instanceKlassHandle k) { 1247 _inner_classes = k->inner_classes(); 1248 if (k->inner_classes() != NULL) { 1249 _length = _inner_classes->length(); 1250 // The inner class array's length should be the multiple of 1251 // inner_class_next_offset if it only contains the InnerClasses 1252 // attribute data, or it should be 1253 // n*inner_class_next_offset+enclosing_method_attribute_size 1254 // if it also contains the EnclosingMethod data. 1255 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1256 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1257 "just checking"); 1258 // Remove the enclosing_method portion if exists. 1259 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1260 _length -= InstanceKlass::enclosing_method_attribute_size; 1261 } 1262 } else { 1263 _length = 0; 1264 } 1265 _idx = 0; 1266 } 1267 1268 int length() const { 1269 return _length; 1270 } 1271 1272 void next() { 1273 _idx += InstanceKlass::inner_class_next_offset; 1274 } 1275 1276 bool done() const { 1277 return (_idx >= _length); 1278 } 1279 1280 u2 inner_class_info_index() const { 1281 return _inner_classes->at( 1282 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1283 } 1284 1285 void set_inner_class_info_index(u2 index) { 1286 _inner_classes->at_put( 1287 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1288 } 1289 1290 u2 outer_class_info_index() const { 1291 return _inner_classes->at( 1292 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1293 } 1294 1295 void set_outer_class_info_index(u2 index) { 1296 _inner_classes->at_put( 1297 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1298 } 1299 1300 u2 inner_name_index() const { 1301 return _inner_classes->at( 1302 _idx + InstanceKlass::inner_class_inner_name_offset); 1303 } 1304 1305 void set_inner_name_index(u2 index) { 1306 _inner_classes->at_put( 1307 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1308 } 1309 1310 u2 inner_access_flags() const { 1311 return _inner_classes->at( 1312 _idx + InstanceKlass::inner_class_access_flags_offset); 1313 } 1314 }; 1315 1316 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP