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