1 /* 2 * Copyright (c) 1997, 2014, 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 bool _has_unloaded_dependent; 230 231 enum { 232 _misc_rewritten = 1 << 0, // methods rewritten. 233 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops 234 _misc_should_verify_class = 1 << 2, // allow caching of preverification 235 _misc_is_anonymous = 1 << 3, // has embedded _host_klass field 236 _misc_is_contended = 1 << 4, // marked with contended annotation 237 _misc_has_default_methods = 1 << 5, // class/superclass/implemented interfaces has default methods 238 _misc_declares_default_methods = 1 << 6 // directly declares default methods (any access) 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 // Array of interesting part(s) of the previous version(s) of this 254 // InstanceKlass. See PreviousVersionWalker below. 255 GrowableArray<PreviousVersionNode *>* _previous_versions; 256 // JVMTI fields can be moved to their own structure - see 6315920 257 // JVMTI: cached class file, before retransformable agent modified it in CFLH 258 JvmtiCachedClassFileData* _cached_class_file; 259 260 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 261 262 // Class states are defined as ClassState (see above). 263 // Place the _init_state here to utilize the unused 2-byte after 264 // _idnum_allocated_count. 265 u1 _init_state; // state of class 266 u1 _reference_type; // reference type 267 268 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 269 270 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 271 272 // Method array. 273 Array<Method*>* _methods; 274 // Default Method Array, concrete methods inherited from interfaces 275 Array<Method*>* _default_methods; 276 // Interface (Klass*s) this class declares locally to implement. 277 Array<Klass*>* _local_interfaces; 278 // Interface (Klass*s) this class implements transitively. 279 Array<Klass*>* _transitive_interfaces; 280 // Int array containing the original order of method in the class file (for JVMTI). 281 Array<int>* _method_ordering; 282 // Int array containing the vtable_indices for default_methods 283 // offset matches _default_methods offset 284 Array<int>* _default_vtable_indices; 285 286 // Instance and static variable information, starts with 6-tuples of shorts 287 // [access, name index, sig index, initval index, low_offset, high_offset] 288 // for all fields, followed by the generic signature data at the end of 289 // the array. Only fields with generic signature attributes have the generic 290 // signature data set in the array. The fields array looks like following: 291 // 292 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 293 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 294 // ... 295 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 296 // [generic signature index] 297 // [generic signature index] 298 // ... 299 Array<u2>* _fields; 300 301 // embedded Java vtable follows here 302 // embedded Java itables follows here 303 // embedded static fields follows here 304 // embedded nonstatic oop-map blocks follows here 305 // embedded implementor of this interface follows here 306 // The embedded implementor only exists if the current klass is an 307 // iterface. The possible values of the implementor fall into following 308 // three cases: 309 // NULL: no implementor. 310 // A Klass* that's not itself: one implementor. 311 // Itself: more than one implementors. 312 // embedded host klass follows here 313 // The embedded host klass only exists in an anonymous class for 314 // dynamic language support (JSR 292 enabled). The host class grants 315 // its access privileges to this class also. The host class is either 316 // named, or a previously loaded anonymous class. A non-anonymous class 317 // or an anonymous class loaded through normal classloading does not 318 // have this embedded field. 319 // 320 321 friend class SystemDictionary; 322 323 public: 324 bool has_nonstatic_fields() const { 325 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 326 } 327 void set_has_nonstatic_fields(bool b) { 328 if (b) { 329 _misc_flags |= _misc_has_nonstatic_fields; 330 } else { 331 _misc_flags &= ~_misc_has_nonstatic_fields; 332 } 333 } 334 335 // field sizes 336 int nonstatic_field_size() const { return _nonstatic_field_size; } 337 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 338 339 int static_field_size() const { return _static_field_size; } 340 void set_static_field_size(int size) { _static_field_size = size; } 341 342 int static_oop_field_count() const { return (int)_static_oop_field_count; } 343 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 344 345 // Java vtable 346 int vtable_length() const { return _vtable_len; } 347 void set_vtable_length(int len) { _vtable_len = len; } 348 349 // Java itable 350 int itable_length() const { return _itable_len; } 351 void set_itable_length(int len) { _itable_len = len; } 352 353 // array klasses 354 Klass* array_klasses() const { return _array_klasses; } 355 void set_array_klasses(Klass* k) { _array_klasses = k; } 356 357 // methods 358 Array<Method*>* methods() const { return _methods; } 359 void set_methods(Array<Method*>* a) { _methods = a; } 360 Method* method_with_idnum(int idnum); 361 362 // method ordering 363 Array<int>* method_ordering() const { return _method_ordering; } 364 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 365 void copy_method_ordering(intArray* m, TRAPS); 366 367 // default_methods 368 Array<Method*>* default_methods() const { return _default_methods; } 369 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 370 371 // default method vtable_indices 372 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 373 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 374 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 375 376 // interfaces 377 Array<Klass*>* local_interfaces() const { return _local_interfaces; } 378 void set_local_interfaces(Array<Klass*>* a) { 379 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 380 _local_interfaces = a; } 381 382 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; } 383 void set_transitive_interfaces(Array<Klass*>* a) { 384 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 385 _transitive_interfaces = a; 386 } 387 388 private: 389 friend class fieldDescriptor; 390 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 391 392 public: 393 int field_offset (int index) const { return field(index)->offset(); } 394 int field_access_flags(int index) const { return field(index)->access_flags(); } 395 Symbol* field_name (int index) const { return field(index)->name(constants()); } 396 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 397 398 // Number of Java declared fields 399 int java_fields_count() const { return (int)_java_fields_count; } 400 401 Array<u2>* fields() const { return _fields; } 402 void set_fields(Array<u2>* f, u2 java_fields_count) { 403 guarantee(_fields == NULL || f == NULL, "Just checking"); 404 _fields = f; 405 _java_fields_count = java_fields_count; 406 } 407 408 // inner classes 409 Array<u2>* inner_classes() const { return _inner_classes; } 410 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 411 412 enum InnerClassAttributeOffset { 413 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 414 inner_class_inner_class_info_offset = 0, 415 inner_class_outer_class_info_offset = 1, 416 inner_class_inner_name_offset = 2, 417 inner_class_access_flags_offset = 3, 418 inner_class_next_offset = 4 419 }; 420 421 enum EnclosingMethodAttributeOffset { 422 enclosing_method_class_index_offset = 0, 423 enclosing_method_method_index_offset = 1, 424 enclosing_method_attribute_size = 2 425 }; 426 427 // method override check 428 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 429 430 // package 431 bool is_same_class_package(Klass* class2); 432 bool is_same_class_package(oop classloader2, Symbol* classname2); 433 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2); 434 435 // find an enclosing class (defined where original code was, in jvm.cpp!) 436 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) { 437 instanceKlassHandle self(THREAD, this); 438 return compute_enclosing_class_impl(self, inner_is_member, THREAD); 439 } 440 static Klass* compute_enclosing_class_impl(instanceKlassHandle self, 441 bool* inner_is_member, TRAPS); 442 443 // tell if two classes have the same enclosing class (at package level) 444 bool is_same_package_member(Klass* class2, TRAPS) { 445 instanceKlassHandle self(THREAD, this); 446 return is_same_package_member_impl(self, class2, THREAD); 447 } 448 static bool is_same_package_member_impl(instanceKlassHandle self, 449 Klass* class2, TRAPS); 450 451 // initialization state 452 bool is_loaded() const { return _init_state >= loaded; } 453 bool is_linked() const { return _init_state >= linked; } 454 bool is_initialized() const { return _init_state == fully_initialized; } 455 bool is_not_initialized() const { return _init_state < being_initialized; } 456 bool is_being_initialized() const { return _init_state == being_initialized; } 457 bool is_in_error_state() const { return _init_state == initialization_error; } 458 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 459 ClassState init_state() { return (ClassState)_init_state; } 460 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 461 462 // defineClass specified verification 463 bool should_verify_class() const { 464 return (_misc_flags & _misc_should_verify_class) != 0; 465 } 466 void set_should_verify_class(bool value) { 467 if (value) { 468 _misc_flags |= _misc_should_verify_class; 469 } else { 470 _misc_flags &= ~_misc_should_verify_class; 471 } 472 } 473 474 // marking 475 bool is_marked_dependent() const { return _is_marked_dependent; } 476 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 477 478 bool has_unloaded_dependent() const { return _has_unloaded_dependent; } 479 void set_has_unloaded_dependent(bool value) { _has_unloaded_dependent = value; } 480 481 // initialization (virtuals from Klass) 482 bool should_be_initialized() const; // means that initialize should be called 483 void initialize(TRAPS); 484 void link_class(TRAPS); 485 bool link_class_or_fail(TRAPS); // returns false on failure 486 void unlink_class(); 487 void rewrite_class(TRAPS); 488 void link_methods(TRAPS); 489 Method* class_initializer(); 490 491 // set the class to initialized if no static initializer is present 492 void eager_initialize(Thread *thread); 493 494 // reference type 495 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 496 void set_reference_type(ReferenceType t) { 497 assert(t == (u1)t, "overflow"); 498 _reference_type = (u1)t; 499 } 500 501 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 502 503 // find local field, returns true if found 504 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 505 // find field in direct superinterfaces, returns the interface in which the field is defined 506 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 507 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 508 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 509 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 510 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 511 512 // find a non-static or static field given its offset within the class. 513 bool contains_field_offset(int offset) { 514 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); 515 } 516 517 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 518 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 519 520 // find a local method (returns NULL if not found) 521 Method* find_method(Symbol* name, Symbol* signature) const; 522 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature); 523 static Method* find_instance_method(Array<Method*>* methods, Symbol* name, Symbol* signature); 524 525 // find a local method index in default_methods (returns -1 if not found) 526 static int find_method_index(Array<Method*>* methods, Symbol* name, Symbol* signature, bool skipping_overpass); 527 528 // lookup operation (returns NULL if not found) 529 Method* uncached_lookup_method(Symbol* name, Symbol* signature, MethodLookupMode mode) const; 530 531 // lookup a method in all the interfaces that this class implements 532 // (returns NULL if not found) 533 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, MethodLookupMode mode) const; 534 535 // lookup a method in local defaults then in all interfaces 536 // (returns NULL if not found) 537 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 538 539 // Find method indices by name. If a method with the specified name is 540 // found the index to the first method is returned, and 'end' is filled in 541 // with the index of first non-name-matching method. If no method is found 542 // -1 is returned. 543 int find_method_by_name(Symbol* name, int* end); 544 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end); 545 546 // constant pool 547 ConstantPool* constants() const { return _constants; } 548 void set_constants(ConstantPool* c) { _constants = c; } 549 550 // protection domain 551 oop protection_domain() const; 552 553 // signers 554 objArrayOop signers() const; 555 556 // host class 557 Klass* host_klass() const { 558 Klass** hk = (Klass**)adr_host_klass(); 559 if (hk == NULL) { 560 return NULL; 561 } else { 562 assert(*hk != NULL, "host klass should always be set if the address is not null"); 563 return *hk; 564 } 565 } 566 void set_host_klass(Klass* host) { 567 assert(is_anonymous(), "not anonymous"); 568 Klass** addr = (Klass**)adr_host_klass(); 569 assert(addr != NULL, "no reversed space"); 570 if (addr != NULL) { 571 *addr = host; 572 } 573 } 574 bool is_anonymous() const { 575 return (_misc_flags & _misc_is_anonymous) != 0; 576 } 577 void set_is_anonymous(bool value) { 578 if (value) { 579 _misc_flags |= _misc_is_anonymous; 580 } else { 581 _misc_flags &= ~_misc_is_anonymous; 582 } 583 } 584 585 // Oop that keeps the metadata for this class from being unloaded 586 // in places where the metadata is stored in other places, like nmethods 587 oop klass_holder() const { 588 return is_anonymous() ? java_mirror() : class_loader(); 589 } 590 591 bool is_contended() const { 592 return (_misc_flags & _misc_is_contended) != 0; 593 } 594 void set_is_contended(bool value) { 595 if (value) { 596 _misc_flags |= _misc_is_contended; 597 } else { 598 _misc_flags &= ~_misc_is_contended; 599 } 600 } 601 602 // source file name 603 Symbol* source_file_name() const { 604 return (_source_file_name_index == 0) ? 605 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index); 606 } 607 u2 source_file_name_index() const { 608 return _source_file_name_index; 609 } 610 void set_source_file_name_index(u2 sourcefile_index) { 611 _source_file_name_index = sourcefile_index; 612 } 613 614 // minor and major version numbers of class file 615 u2 minor_version() const { return _minor_version; } 616 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 617 u2 major_version() const { return _major_version; } 618 void set_major_version(u2 major_version) { _major_version = major_version; } 619 620 // source debug extension 621 char* source_debug_extension() const { return _source_debug_extension; } 622 void set_source_debug_extension(char* array, int length); 623 624 // symbol unloading support (refcount already added) 625 Symbol* array_name() { return _array_name; } 626 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; } 627 628 // nonstatic oop-map blocks 629 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 630 return oop_map_count * OopMapBlock::size_in_words(); 631 } 632 unsigned int nonstatic_oop_map_count() const { 633 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 634 } 635 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 636 void set_nonstatic_oop_map_size(int words) { 637 _nonstatic_oop_map_size = words; 638 } 639 640 // RedefineClasses() support for previous versions: 641 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods, 642 int emcp_method_count); 643 // If the _previous_versions array is non-NULL, then this klass 644 // has been redefined at least once even if we aren't currently 645 // tracking a previous version. 646 bool has_been_redefined() const { return _previous_versions != NULL; } 647 bool has_previous_version() const; 648 void init_previous_versions() { 649 _previous_versions = NULL; 650 } 651 GrowableArray<PreviousVersionNode *>* previous_versions() const { 652 return _previous_versions; 653 } 654 655 static void purge_previous_versions(InstanceKlass* ik); 656 657 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 658 void set_cached_class_file(JvmtiCachedClassFileData *data) { 659 _cached_class_file = data; 660 } 661 JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; } 662 jint get_cached_class_file_len(); 663 unsigned char * get_cached_class_file_bytes(); 664 665 // JVMTI: Support for caching of field indices, types, and offsets 666 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 667 _jvmti_cached_class_field_map = descriptor; 668 } 669 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 670 return _jvmti_cached_class_field_map; 671 } 672 673 bool has_default_methods() const { 674 return (_misc_flags & _misc_has_default_methods) != 0; 675 } 676 void set_has_default_methods(bool b) { 677 if (b) { 678 _misc_flags |= _misc_has_default_methods; 679 } else { 680 _misc_flags &= ~_misc_has_default_methods; 681 } 682 } 683 684 bool declares_default_methods() const { 685 return (_misc_flags & _misc_declares_default_methods) != 0; 686 } 687 void set_declares_default_methods(bool b) { 688 if (b) { 689 _misc_flags |= _misc_declares_default_methods; 690 } else { 691 _misc_flags &= ~_misc_declares_default_methods; 692 } 693 } 694 695 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 696 inline u2 next_method_idnum(); 697 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 698 699 // generics support 700 Symbol* generic_signature() const { 701 return (_generic_signature_index == 0) ? 702 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index); 703 } 704 u2 generic_signature_index() const { 705 return _generic_signature_index; 706 } 707 void set_generic_signature_index(u2 sig_index) { 708 _generic_signature_index = sig_index; 709 } 710 711 u2 enclosing_method_data(int offset); 712 u2 enclosing_method_class_index() { 713 return enclosing_method_data(enclosing_method_class_index_offset); 714 } 715 u2 enclosing_method_method_index() { 716 return enclosing_method_data(enclosing_method_method_index_offset); 717 } 718 void set_enclosing_method_indices(u2 class_index, 719 u2 method_index); 720 721 // jmethodID support 722 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, 723 methodHandle method_h); 724 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h, 725 size_t idnum, jmethodID new_id, jmethodID* new_jmeths, 726 jmethodID* to_dealloc_id_p, 727 jmethodID** to_dealloc_jmeths_p); 728 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 729 size_t *length_p, jmethodID* id_p); 730 jmethodID jmethod_id_or_null(Method* method); 731 732 // annotations support 733 Annotations* annotations() const { return _annotations; } 734 void set_annotations(Annotations* anno) { _annotations = anno; } 735 736 AnnotationArray* class_annotations() const { 737 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 738 } 739 Array<AnnotationArray*>* fields_annotations() const { 740 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 741 } 742 AnnotationArray* class_type_annotations() const { 743 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 744 } 745 Array<AnnotationArray*>* fields_type_annotations() const { 746 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 747 } 748 // allocation 749 instanceOop allocate_instance(TRAPS); 750 751 // additional member function to return a handle 752 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } 753 754 objArrayOop allocate_objArray(int n, int length, TRAPS); 755 // Helper function 756 static instanceOop register_finalizer(instanceOop i, TRAPS); 757 758 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 759 // if not, throw either an Error or an Exception. 760 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 761 762 // initialization 763 void call_class_initializer(TRAPS); 764 void set_initialization_state_and_notify(ClassState state, TRAPS); 765 766 // OopMapCache support 767 OopMapCache* oop_map_cache() { return _oop_map_cache; } 768 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 769 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry); 770 771 // JNI identifier support (for static fields - for jni performance) 772 JNIid* jni_ids() { return _jni_ids; } 773 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 774 JNIid* jni_id_for(int offset); 775 776 // maintenance of deoptimization dependencies 777 int mark_dependent_nmethods(DepChange& changes); 778 void add_dependent_nmethod(nmethod* nm); 779 void remove_dependent_nmethod(nmethod* nm); 780 781 // On-stack replacement support 782 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 783 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 784 void add_osr_nmethod(nmethod* n); 785 void remove_osr_nmethod(nmethod* n); 786 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 787 788 // Breakpoint support (see methods on Method* for details) 789 BreakpointInfo* breakpoints() const { return _breakpoints; }; 790 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 791 792 // support for stub routines 793 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 794 TRACE_DEFINE_OFFSET; 795 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 796 797 // subclass/subinterface checks 798 bool implements_interface(Klass* k) const; 799 bool is_same_or_direct_interface(Klass* k) const; 800 801 // Access to the implementor of an interface. 802 Klass* implementor() const 803 { 804 Klass** k = adr_implementor(); 805 if (k == NULL) { 806 return NULL; 807 } else { 808 return *k; 809 } 810 } 811 812 void set_implementor(Klass* k) { 813 assert(is_interface(), "not interface"); 814 Klass** addr = adr_implementor(); 815 assert(addr != NULL, "null addr"); 816 if (addr != NULL) { 817 *addr = k; 818 } 819 } 820 821 int nof_implementors() const { 822 Klass* k = implementor(); 823 if (k == NULL) { 824 return 0; 825 } else if (k != this) { 826 return 1; 827 } else { 828 return 2; 829 } 830 } 831 832 void add_implementor(Klass* k); // k is a new class that implements this interface 833 void init_implementor(); // initialize 834 835 // link this class into the implementors list of every interface it implements 836 void process_interfaces(Thread *thread); 837 838 // virtual operations from Klass 839 bool is_leaf_class() const { return _subklass == NULL; } 840 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); 841 bool compute_is_subtype_of(Klass* k); 842 bool can_be_primary_super_slow() const; 843 int oop_size(oop obj) const { return size_helper(); } 844 bool oop_is_instance_slow() const { return true; } 845 846 // Iterators 847 void do_local_static_fields(FieldClosure* cl); 848 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 849 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 850 851 void methods_do(void f(Method* method)); 852 void array_klasses_do(void f(Klass* k)); 853 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 854 bool super_types_do(SuperTypeClosure* blk); 855 856 // Casting from Klass* 857 static InstanceKlass* cast(Klass* k) { 858 assert(k->is_klass(), "must be"); 859 assert(k->oop_is_instance(), "cast to InstanceKlass"); 860 return (InstanceKlass*) k; 861 } 862 863 InstanceKlass* java_super() const { 864 return (super() == NULL) ? NULL : cast(super()); 865 } 866 867 // Sizing (in words) 868 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); } 869 870 static int size(int vtable_length, int itable_length, 871 int nonstatic_oop_map_size, 872 bool is_interface, bool is_anonymous) { 873 return align_object_size(header_size() + 874 align_object_offset(vtable_length) + 875 align_object_offset(itable_length) + 876 ((is_interface || is_anonymous) ? 877 align_object_offset(nonstatic_oop_map_size) : 878 nonstatic_oop_map_size) + 879 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) + 880 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0)); 881 } 882 int size() const { return size(vtable_length(), 883 itable_length(), 884 nonstatic_oop_map_size(), 885 is_interface(), 886 is_anonymous()); 887 } 888 #if INCLUDE_SERVICES 889 virtual void collect_statistics(KlassSizeStats *sz) const; 890 #endif 891 892 static int vtable_start_offset() { return header_size(); } 893 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; } 894 895 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); } 896 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); } 897 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 898 899 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 900 901 address static_field_addr(int offset); 902 903 OopMapBlock* start_of_nonstatic_oop_maps() const { 904 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length())); 905 } 906 907 Klass** end_of_nonstatic_oop_maps() const { 908 return (Klass**)(start_of_nonstatic_oop_maps() + 909 nonstatic_oop_map_count()); 910 } 911 912 Klass** adr_implementor() const { 913 if (is_interface()) { 914 return (Klass**)end_of_nonstatic_oop_maps(); 915 } else { 916 return NULL; 917 } 918 }; 919 920 Klass** adr_host_klass() const { 921 if (is_anonymous()) { 922 Klass** adr_impl = adr_implementor(); 923 if (adr_impl != NULL) { 924 return adr_impl + 1; 925 } else { 926 return end_of_nonstatic_oop_maps(); 927 } 928 } else { 929 return NULL; 930 } 931 } 932 933 // Use this to return the size of an instance in heap words: 934 int size_helper() const { 935 return layout_helper_to_size_helper(layout_helper()); 936 } 937 938 // This bit is initialized in classFileParser.cpp. 939 // It is false under any of the following conditions: 940 // - the class is abstract (including any interface) 941 // - the class has a finalizer (if !RegisterFinalizersAtInit) 942 // - the class size is larger than FastAllocateSizeLimit 943 // - the class is java/lang/Class, which cannot be allocated directly 944 bool can_be_fastpath_allocated() const { 945 return !layout_helper_needs_slow_path(layout_helper()); 946 } 947 948 // Java vtable/itable 949 klassVtable* vtable() const; // return new klassVtable wrapper 950 inline Method* method_at_vtable(int index); 951 klassItable* itable() const; // return new klassItable wrapper 952 Method* method_at_itable(Klass* holder, int index, TRAPS); 953 954 #if INCLUDE_JVMTI 955 void adjust_default_methods(Method** old_methods, Method** new_methods, 956 int methods_length, bool* trace_name_printed); 957 #endif // INCLUDE_JVMTI 958 959 // Garbage collection 960 void oop_follow_contents(oop obj); 961 int oop_adjust_pointers(oop obj); 962 963 void clean_implementors_list(BoolObjectClosure* is_alive); 964 void clean_method_data(BoolObjectClosure* is_alive); 965 void clean_dependent_nmethods(); 966 967 // Explicit metaspace deallocation of fields 968 // For RedefineClasses and class file parsing errors, we need to deallocate 969 // instanceKlasses and the metadata they point to. 970 void deallocate_contents(ClassLoaderData* loader_data); 971 static void deallocate_methods(ClassLoaderData* loader_data, 972 Array<Method*>* methods); 973 void static deallocate_interfaces(ClassLoaderData* loader_data, 974 Klass* super_klass, 975 Array<Klass*>* local_interfaces, 976 Array<Klass*>* transitive_interfaces); 977 978 // The constant pool is on stack if any of the methods are executing or 979 // referenced by handles. 980 bool on_stack() const { return _constants->on_stack(); } 981 982 // callbacks for actions during class unloading 983 static void notify_unload_class(InstanceKlass* ik); 984 static void release_C_heap_structures(InstanceKlass* ik); 985 986 // Parallel Scavenge and Parallel Old 987 PARALLEL_GC_DECLS 988 989 // Naming 990 const char* signature_name() const; 991 992 // Iterators 993 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) { 994 return oop_oop_iterate_v(obj, blk); 995 } 996 997 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) { 998 return oop_oop_iterate_v_m(obj, blk, mr); 999 } 1000 1001 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ 1002 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ 1003 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \ 1004 MemRegion mr); 1005 1006 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL) 1007 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL) 1008 1009 #if INCLUDE_ALL_GCS 1010 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ 1011 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); 1012 1013 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 1014 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 1015 #endif // INCLUDE_ALL_GCS 1016 1017 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1018 1019 public: 1020 void set_in_error_state() { 1021 assert(DumpSharedSpaces, "only call this when dumping archive"); 1022 _init_state = initialization_error; 1023 } 1024 bool check_sharing_error_state(); 1025 1026 private: 1027 // initialization state 1028 #ifdef ASSERT 1029 void set_init_state(ClassState state); 1030 #else 1031 void set_init_state(ClassState state) { _init_state = (u1)state; } 1032 #endif 1033 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1034 void set_init_thread(Thread *thread) { _init_thread = thread; } 1035 1036 // The RedefineClasses() API can cause new method idnums to be needed 1037 // which will cause the caches to grow. Safety requires different 1038 // cache management logic if the caches can grow instead of just 1039 // going from NULL to non-NULL. 1040 bool idnum_can_increment() const { return has_been_redefined(); } 1041 jmethodID* methods_jmethod_ids_acquire() const 1042 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); } 1043 void release_set_methods_jmethod_ids(jmethodID* jmeths) 1044 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); } 1045 1046 // Lock during initialization 1047 public: 1048 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1049 // Must be one per class and it has to be a VM internal object so java code 1050 // cannot lock it (like the mirror). 1051 // It has to be an object not a Mutex because it's held through java calls. 1052 oop init_lock() const; 1053 private: 1054 void fence_and_clear_init_lock(); 1055 1056 // Static methods that are used to implement member methods where an exposed this pointer 1057 // is needed due to possible GCs 1058 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); 1059 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); 1060 static void initialize_impl (instanceKlassHandle this_oop, TRAPS); 1061 static void initialize_super_interfaces (instanceKlassHandle this_oop, TRAPS); 1062 static void eager_initialize_impl (instanceKlassHandle this_oop); 1063 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS); 1064 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS); 1065 static Klass* array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS); 1066 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS); 1067 /* jni_id_for_impl for jfieldID only */ 1068 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset); 1069 1070 // Returns the array class for the n'th dimension 1071 Klass* array_klass_impl(bool or_null, int n, TRAPS); 1072 1073 // Returns the array class with this class as element type 1074 Klass* array_klass_impl(bool or_null, TRAPS); 1075 1076 // find a local method (returns NULL if not found) 1077 Method* find_method_impl(Symbol* name, Symbol* signature, bool skipping_overpass) const; 1078 static Method* find_method_impl(Array<Method*>* methods, Symbol* name, Symbol* signature, bool skipping_overpass); 1079 1080 // Free CHeap allocated fields. 1081 void release_C_heap_structures(); 1082 public: 1083 // CDS support - remove and restore oops from metadata. Oops are not shared. 1084 virtual void remove_unshareable_info(); 1085 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 1086 1087 // jvm support 1088 jint compute_modifier_flags(TRAPS) const; 1089 1090 // JSR-292 support 1091 MemberNameTable* member_names() { return _member_names; } 1092 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; } 1093 void add_member_name(int index, Handle member_name); 1094 oop get_member_name(int index); 1095 1096 public: 1097 // JVMTI support 1098 jint jvmti_class_status() const; 1099 1100 public: 1101 // Printing 1102 #ifndef PRODUCT 1103 void print_on(outputStream* st) const; 1104 #endif 1105 void print_value_on(outputStream* st) const; 1106 1107 void oop_print_value_on(oop obj, outputStream* st); 1108 1109 #ifndef PRODUCT 1110 void oop_print_on (oop obj, outputStream* st); 1111 1112 void print_dependent_nmethods(bool verbose = false); 1113 bool is_dependent_nmethod(nmethod* nm); 1114 #endif 1115 1116 const char* internal_name() const; 1117 1118 // Verification 1119 void verify_on(outputStream* st); 1120 1121 void oop_verify_on(oop obj, outputStream* st); 1122 }; 1123 1124 inline Method* InstanceKlass::method_at_vtable(int index) { 1125 #ifndef PRODUCT 1126 assert(index >= 0, "valid vtable index"); 1127 if (DebugVtables) { 1128 verify_vtable_index(index); 1129 } 1130 #endif 1131 vtableEntry* ve = (vtableEntry*)start_of_vtable(); 1132 return ve[index].method(); 1133 } 1134 1135 // for adding methods 1136 // UNSET_IDNUM return means no more ids available 1137 inline u2 InstanceKlass::next_method_idnum() { 1138 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1139 return ConstMethod::UNSET_IDNUM; // no more ids available 1140 } else { 1141 return _idnum_allocated_count++; 1142 } 1143 } 1144 1145 1146 /* JNIid class for jfieldIDs only */ 1147 class JNIid: public CHeapObj<mtClass> { 1148 friend class VMStructs; 1149 private: 1150 Klass* _holder; 1151 JNIid* _next; 1152 int _offset; 1153 #ifdef ASSERT 1154 bool _is_static_field_id; 1155 #endif 1156 1157 public: 1158 // Accessors 1159 Klass* holder() const { return _holder; } 1160 int offset() const { return _offset; } 1161 JNIid* next() { return _next; } 1162 // Constructor 1163 JNIid(Klass* holder, int offset, JNIid* next); 1164 // Identifier lookup 1165 JNIid* find(int offset); 1166 1167 bool find_local_field(fieldDescriptor* fd) { 1168 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1169 } 1170 1171 static void deallocate(JNIid* id); 1172 // Debugging 1173 #ifdef ASSERT 1174 bool is_static_field_id() const { return _is_static_field_id; } 1175 void set_is_static_field_id() { _is_static_field_id = true; } 1176 #endif 1177 void verify(Klass* holder); 1178 }; 1179 1180 1181 // If breakpoints are more numerous than just JVMTI breakpoints, 1182 // consider compressing this data structure. 1183 // It is currently a simple linked list defined in method.hpp. 1184 1185 class BreakpointInfo; 1186 1187 1188 // A collection point for interesting information about the previous 1189 // version(s) of an InstanceKlass. A GrowableArray of PreviousVersionNodes 1190 // is attached to the InstanceKlass as needed. See PreviousVersionWalker below. 1191 class PreviousVersionNode : public CHeapObj<mtClass> { 1192 private: 1193 ConstantPool* _prev_constant_pool; 1194 1195 // If the previous version of the InstanceKlass doesn't have any 1196 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the 1197 // EMCP methods have been collected, then _prev_EMCP_methods can 1198 // have a length of zero. 1199 GrowableArray<Method*>* _prev_EMCP_methods; 1200 1201 public: 1202 PreviousVersionNode(ConstantPool* prev_constant_pool, 1203 GrowableArray<Method*>* prev_EMCP_methods); 1204 ~PreviousVersionNode(); 1205 ConstantPool* prev_constant_pool() const { 1206 return _prev_constant_pool; 1207 } 1208 GrowableArray<Method*>* prev_EMCP_methods() const { 1209 return _prev_EMCP_methods; 1210 } 1211 }; 1212 1213 1214 // Helper object for walking previous versions. 1215 class PreviousVersionWalker : public StackObj { 1216 private: 1217 Thread* _thread; 1218 GrowableArray<PreviousVersionNode *>* _previous_versions; 1219 int _current_index; 1220 1221 // A pointer to the current node object so we can handle the deletes. 1222 PreviousVersionNode* _current_p; 1223 1224 // The constant pool handle keeps all the methods in this class from being 1225 // deallocated from the metaspace during class unloading. 1226 constantPoolHandle _current_constant_pool_handle; 1227 1228 public: 1229 PreviousVersionWalker(Thread* thread, InstanceKlass *ik); 1230 1231 // Return the interesting information for the next previous version 1232 // of the klass. Returns NULL if there are no more previous versions. 1233 PreviousVersionNode* next_previous_version(); 1234 }; 1235 1236 1237 // 1238 // nmethodBucket is used to record dependent nmethods for 1239 // deoptimization. nmethod dependencies are actually <klass, method> 1240 // pairs but we really only care about the klass part for purposes of 1241 // finding nmethods which might need to be deoptimized. Instead of 1242 // recording the method, a count of how many times a particular nmethod 1243 // was recorded is kept. This ensures that any recording errors are 1244 // noticed since an nmethod should be removed as many times are it's 1245 // added. 1246 // 1247 class nmethodBucket: public CHeapObj<mtClass> { 1248 friend class VMStructs; 1249 private: 1250 nmethod* _nmethod; 1251 int _count; 1252 nmethodBucket* _next; 1253 1254 public: 1255 nmethodBucket(nmethod* nmethod, nmethodBucket* next) { 1256 _nmethod = nmethod; 1257 _next = next; 1258 _count = 1; 1259 } 1260 int count() { return _count; } 1261 int increment() { _count += 1; return _count; } 1262 int decrement(); 1263 nmethodBucket* next() { return _next; } 1264 void set_next(nmethodBucket* b) { _next = b; } 1265 nmethod* get_nmethod() { return _nmethod; } 1266 }; 1267 1268 // An iterator that's used to access the inner classes indices in the 1269 // InstanceKlass::_inner_classes array. 1270 class InnerClassesIterator : public StackObj { 1271 private: 1272 Array<jushort>* _inner_classes; 1273 int _length; 1274 int _idx; 1275 public: 1276 1277 InnerClassesIterator(instanceKlassHandle k) { 1278 _inner_classes = k->inner_classes(); 1279 if (k->inner_classes() != NULL) { 1280 _length = _inner_classes->length(); 1281 // The inner class array's length should be the multiple of 1282 // inner_class_next_offset if it only contains the InnerClasses 1283 // attribute data, or it should be 1284 // n*inner_class_next_offset+enclosing_method_attribute_size 1285 // if it also contains the EnclosingMethod data. 1286 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1287 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1288 "just checking"); 1289 // Remove the enclosing_method portion if exists. 1290 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1291 _length -= InstanceKlass::enclosing_method_attribute_size; 1292 } 1293 } else { 1294 _length = 0; 1295 } 1296 _idx = 0; 1297 } 1298 1299 int length() const { 1300 return _length; 1301 } 1302 1303 void next() { 1304 _idx += InstanceKlass::inner_class_next_offset; 1305 } 1306 1307 bool done() const { 1308 return (_idx >= _length); 1309 } 1310 1311 u2 inner_class_info_index() const { 1312 return _inner_classes->at( 1313 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1314 } 1315 1316 void set_inner_class_info_index(u2 index) { 1317 _inner_classes->at_put( 1318 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1319 } 1320 1321 u2 outer_class_info_index() const { 1322 return _inner_classes->at( 1323 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1324 } 1325 1326 void set_outer_class_info_index(u2 index) { 1327 _inner_classes->at_put( 1328 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1329 } 1330 1331 u2 inner_name_index() const { 1332 return _inner_classes->at( 1333 _idx + InstanceKlass::inner_class_inner_name_offset); 1334 } 1335 1336 void set_inner_name_index(u2 index) { 1337 _inner_classes->at_put( 1338 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1339 } 1340 1341 u2 inner_access_flags() const { 1342 return _inner_classes->at( 1343 _idx + InstanceKlass::inner_class_access_flags_offset); 1344 } 1345 }; 1346 1347 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP