instanceKlass.hpp revision 4277:3efdfd6ddbf2
1/* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#ifndef SHARE_VM_OOPS_INSTANCEKLASS_HPP 26#define SHARE_VM_OOPS_INSTANCEKLASS_HPP 27 28#include "classfile/classLoaderData.hpp" 29#include "oops/annotations.hpp" 30#include "oops/constMethod.hpp" 31#include "oops/fieldInfo.hpp" 32#include "oops/instanceOop.hpp" 33#include "oops/klassVtable.hpp" 34#include "runtime/atomic.hpp" 35#include "runtime/handles.hpp" 36#include "runtime/os.hpp" 37#include "utilities/accessFlags.hpp" 38#include "utilities/bitMap.inline.hpp" 39#include "utilities/macros.hpp" 40 41// An InstanceKlass is the VM level representation of a Java class. 42// It contains all information needed for at class at execution runtime. 43 44// InstanceKlass layout: 45// [C++ vtbl pointer ] Klass 46// [subtype cache ] Klass 47// [instance size ] Klass 48// [java mirror ] Klass 49// [super ] Klass 50// [access_flags ] Klass 51// [name ] Klass 52// [first subklass ] Klass 53// [next sibling ] Klass 54// [array klasses ] 55// [methods ] 56// [local interfaces ] 57// [transitive interfaces ] 58// [fields ] 59// [constants ] 60// [class loader ] 61// [protection domain ] 62// [signers ] 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 84class SuperTypeClosure; 85class JNIid; 86class jniIdMapBase; 87class BreakpointInfo; 88class fieldDescriptor; 89class DepChange; 90class nmethodBucket; 91class PreviousVersionNode; 92class JvmtiCachedClassFieldMap; 93 94// This is used in iterators below. 95class FieldClosure: public StackObj { 96public: 97 virtual void do_field(fieldDescriptor* fd) = 0; 98}; 99 100#ifndef PRODUCT 101// Print fields. 102// If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. 103class FieldPrinter: public FieldClosure { 104 oop _obj; 105 outputStream* _st; 106 public: 107 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} 108 void do_field(fieldDescriptor* fd); 109}; 110#endif // !PRODUCT 111 112// ValueObjs embedded in klass. Describes where oops are located in instances of 113// this klass. 114class OopMapBlock VALUE_OBJ_CLASS_SPEC { 115 public: 116 // Byte offset of the first oop mapped by this block. 117 int offset() const { return _offset; } 118 void set_offset(int offset) { _offset = offset; } 119 120 // Number of oops in this block. 121 uint count() const { return _count; } 122 void set_count(uint count) { _count = count; } 123 124 // sizeof(OopMapBlock) in HeapWords. 125 static const int size_in_words() { 126 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >> 127 LogHeapWordSize; 128 } 129 130 private: 131 int _offset; 132 uint _count; 133}; 134 135class InstanceKlass: public Klass { 136 friend class VMStructs; 137 friend class ClassFileParser; 138 friend class CompileReplay; 139 140 protected: 141 // Constructor 142 InstanceKlass(int vtable_len, 143 int itable_len, 144 int static_field_size, 145 int nonstatic_oop_map_size, 146 ReferenceType rt, 147 AccessFlags access_flags, 148 bool is_anonymous); 149 public: 150 static Klass* allocate_instance_klass(ClassLoaderData* loader_data, 151 int vtable_len, 152 int itable_len, 153 int static_field_size, 154 int nonstatic_oop_map_size, 155 ReferenceType rt, 156 AccessFlags access_flags, 157 Symbol* name, 158 Klass* super_klass, 159 bool is_anonymous, 160 TRAPS); 161 162 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } 163 164 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 165 // of the class loading & initialization procedure, and the use of the states. 166 enum ClassState { 167 allocated, // allocated (but not yet linked) 168 loaded, // loaded and inserted in class hierarchy (but not linked yet) 169 linked, // successfully linked/verified (but not initialized yet) 170 being_initialized, // currently running class initializer 171 fully_initialized, // initialized (successfull final state) 172 initialization_error // error happened during initialization 173 }; 174 175 static int number_of_instance_classes() { return _total_instanceKlass_count; } 176 177 private: 178 static volatile int _total_instanceKlass_count; 179 180 protected: 181 // Protection domain. 182 oop _protection_domain; 183 // Class signers. 184 objArrayOop _signers; 185 // Initialization lock. Must be one per class and it has to be a VM internal 186 // object so java code cannot lock it (like the mirror) 187 // It has to be an object not a Mutex because it's held through java calls. 188 volatile oop _init_lock; 189 190 // Annotations for this class 191 Annotations* _annotations; 192 // Array classes holding elements of this class. 193 Klass* _array_klasses; 194 // Constant pool for this class. 195 ConstantPool* _constants; 196 // The InnerClasses attribute and EnclosingMethod attribute. The 197 // _inner_classes is an array of shorts. If the class has InnerClasses 198 // attribute, then the _inner_classes array begins with 4-tuples of shorts 199 // [inner_class_info_index, outer_class_info_index, 200 // inner_name_index, inner_class_access_flags] for the InnerClasses 201 // attribute. If the EnclosingMethod attribute exists, it occupies the 202 // last two shorts [class_index, method_index] of the array. If only 203 // the InnerClasses attribute exists, the _inner_classes array length is 204 // number_of_inner_classes * 4. If the class has both InnerClasses 205 // and EnclosingMethod attributes the _inner_classes array length is 206 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 207 Array<jushort>* _inner_classes; 208 209 // Name of source file containing this klass, NULL if not specified. 210 Symbol* _source_file_name; 211 // the source debug extension for this klass, NULL if not specified. 212 // Specified as UTF-8 string without terminating zero byte in the classfile, 213 // it is stored in the instanceklass as a NULL-terminated UTF-8 string 214 char* _source_debug_extension; 215 // Generic signature, or null if none. 216 Symbol* _generic_signature; 217 // Array name derived from this class which needs unreferencing 218 // if this class is unloaded. 219 Symbol* _array_name; 220 221 // Number of heapOopSize words used by non-static fields in this klass 222 // (including inherited fields but after header_size()). 223 int _nonstatic_field_size; 224 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 225 u2 _static_oop_field_count;// number of static oop fields in this klass 226 u2 _java_fields_count; // The number of declared Java fields 227 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 228 229 // _is_marked_dependent can be set concurrently, thus cannot be part of the 230 // _misc_flags. 231 bool _is_marked_dependent; // used for marking during flushing and deoptimization 232 233 enum { 234 _misc_rewritten = 1 << 0, // methods rewritten. 235 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops 236 _misc_should_verify_class = 1 << 2, // allow caching of preverification 237 _misc_is_anonymous = 1 << 3, // has embedded _inner_classes field 238 _misc_is_contended = 1 << 4, // marked with contended annotation 239 _misc_has_default_methods = 1 << 5 // class/superclass/implemented interfaces has default methods 240 }; 241 u2 _misc_flags; 242 u2 _minor_version; // minor version number of class file 243 u2 _major_version; // major version number of class file 244 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) 245 int _vtable_len; // length of Java vtable (in words) 246 int _itable_len; // length of Java itable (in words) 247 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 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 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL 251 nmethodBucket* _dependencies; // list of dependent nmethods 252 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 253 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 254 // Array of interesting part(s) of the previous version(s) of this 255 // InstanceKlass. See PreviousVersionWalker below. 256 GrowableArray<PreviousVersionNode *>* _previous_versions; 257 // JVMTI fields can be moved to their own structure - see 6315920 258 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH 259 jint _cached_class_file_len; // JVMTI: length of above 260 261 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 262 263 // Class states are defined as ClassState (see above). 264 // Place the _init_state here to utilize the unused 2-byte after 265 // _idnum_allocated_count. 266 u1 _init_state; // state of class 267 u1 _reference_type; // reference type 268 269 270 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 271 272 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 273 274 // Method array. 275 Array<Method*>* _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 // Instance and static variable information, starts with 6-tuples of shorts 283 // [access, name index, sig index, initval index, low_offset, high_offset] 284 // for all fields, followed by the generic signature data at the end of 285 // the array. Only fields with generic signature attributes have the generic 286 // signature data set in the array. The fields array looks like following: 287 // 288 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 289 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 290 // ... 291 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 292 // [generic signature index] 293 // [generic signature index] 294 // ... 295 Array<u2>* _fields; 296 297 // embedded Java vtable follows here 298 // embedded Java itables follows here 299 // embedded static fields follows here 300 // embedded nonstatic oop-map blocks follows here 301 // embedded implementor of this interface follows here 302 // The embedded implementor only exists if the current klass is an 303 // iterface. The possible values of the implementor fall into following 304 // three cases: 305 // NULL: no implementor. 306 // A Klass* that's not itself: one implementor. 307 // Itsef: more than one implementors. 308 // embedded host klass follows here 309 // The embedded host klass only exists in an anonymous class for 310 // dynamic language support (JSR 292 enabled). The host class grants 311 // its access privileges to this class also. The host class is either 312 // named, or a previously loaded anonymous class. A non-anonymous class 313 // or an anonymous class loaded through normal classloading does not 314 // have this embedded field. 315 // 316 317 friend class SystemDictionary; 318 319 public: 320 bool has_nonstatic_fields() const { 321 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 322 } 323 void set_has_nonstatic_fields(bool b) { 324 if (b) { 325 _misc_flags |= _misc_has_nonstatic_fields; 326 } else { 327 _misc_flags &= ~_misc_has_nonstatic_fields; 328 } 329 } 330 331 // field sizes 332 int nonstatic_field_size() const { return _nonstatic_field_size; } 333 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 334 335 int static_field_size() const { return _static_field_size; } 336 void set_static_field_size(int size) { _static_field_size = size; } 337 338 int static_oop_field_count() const { return (int)_static_oop_field_count; } 339 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 340 341 // Java vtable 342 int vtable_length() const { return _vtable_len; } 343 void set_vtable_length(int len) { _vtable_len = len; } 344 345 // Java itable 346 int itable_length() const { return _itable_len; } 347 void set_itable_length(int len) { _itable_len = len; } 348 349 // array klasses 350 Klass* array_klasses() const { return _array_klasses; } 351 void set_array_klasses(Klass* k) { _array_klasses = k; } 352 353 // methods 354 Array<Method*>* methods() const { return _methods; } 355 void set_methods(Array<Method*>* a) { _methods = a; } 356 Method* method_with_idnum(int idnum); 357 358 // method ordering 359 Array<int>* method_ordering() const { return _method_ordering; } 360 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 361 362 // interfaces 363 Array<Klass*>* local_interfaces() const { return _local_interfaces; } 364 void set_local_interfaces(Array<Klass*>* a) { 365 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 366 _local_interfaces = a; } 367 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; } 368 void set_transitive_interfaces(Array<Klass*>* a) { 369 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 370 _transitive_interfaces = a; } 371 372 private: 373 friend class fieldDescriptor; 374 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 375 376 public: 377 int field_offset (int index) const { return field(index)->offset(); } 378 int field_access_flags(int index) const { return field(index)->access_flags(); } 379 Symbol* field_name (int index) const { return field(index)->name(constants()); } 380 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 381 382 // Number of Java declared fields 383 int java_fields_count() const { return (int)_java_fields_count; } 384 385 Array<u2>* fields() const { return _fields; } 386 387 void set_fields(Array<u2>* f, u2 java_fields_count) { 388 guarantee(_fields == NULL || f == NULL, "Just checking"); 389 _fields = f; 390 _java_fields_count = java_fields_count; 391 } 392 393 // inner classes 394 Array<u2>* inner_classes() const { return _inner_classes; } 395 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 396 397 enum InnerClassAttributeOffset { 398 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 399 inner_class_inner_class_info_offset = 0, 400 inner_class_outer_class_info_offset = 1, 401 inner_class_inner_name_offset = 2, 402 inner_class_access_flags_offset = 3, 403 inner_class_next_offset = 4 404 }; 405 406 enum EnclosingMethodAttributeOffset { 407 enclosing_method_class_index_offset = 0, 408 enclosing_method_method_index_offset = 1, 409 enclosing_method_attribute_size = 2 410 }; 411 412 // method override check 413 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 414 415 // package 416 bool is_same_class_package(Klass* class2); 417 bool is_same_class_package(oop classloader2, Symbol* classname2); 418 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2); 419 420 // find an enclosing class (defined where original code was, in jvm.cpp!) 421 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) { 422 instanceKlassHandle self(THREAD, this); 423 return compute_enclosing_class_impl(self, inner_is_member, THREAD); 424 } 425 static Klass* compute_enclosing_class_impl(instanceKlassHandle self, 426 bool* inner_is_member, TRAPS); 427 428 // tell if two classes have the same enclosing class (at package level) 429 bool is_same_package_member(Klass* class2, TRAPS) { 430 instanceKlassHandle self(THREAD, this); 431 return is_same_package_member_impl(self, class2, THREAD); 432 } 433 static bool is_same_package_member_impl(instanceKlassHandle self, 434 Klass* class2, TRAPS); 435 436 // initialization state 437 bool is_loaded() const { return _init_state >= loaded; } 438 bool is_linked() const { return _init_state >= linked; } 439 bool is_initialized() const { return _init_state == fully_initialized; } 440 bool is_not_initialized() const { return _init_state < being_initialized; } 441 bool is_being_initialized() const { return _init_state == being_initialized; } 442 bool is_in_error_state() const { return _init_state == initialization_error; } 443 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 444 ClassState init_state() { return (ClassState)_init_state; } 445 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 446 447 // defineClass specified verification 448 bool should_verify_class() const { 449 return (_misc_flags & _misc_should_verify_class) != 0; 450 } 451 void set_should_verify_class(bool value) { 452 if (value) { 453 _misc_flags |= _misc_should_verify_class; 454 } else { 455 _misc_flags &= ~_misc_should_verify_class; 456 } 457 } 458 459 // marking 460 bool is_marked_dependent() const { return _is_marked_dependent; } 461 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 462 463 // initialization (virtuals from Klass) 464 bool should_be_initialized() const; // means that initialize should be called 465 void initialize(TRAPS); 466 void link_class(TRAPS); 467 bool link_class_or_fail(TRAPS); // returns false on failure 468 void unlink_class(); 469 void rewrite_class(TRAPS); 470 void link_methods(TRAPS); 471 Method* class_initializer(); 472 473 // set the class to initialized if no static initializer is present 474 void eager_initialize(Thread *thread); 475 476 // reference type 477 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 478 void set_reference_type(ReferenceType t) { 479 assert(t == (u1)t, "overflow"); 480 _reference_type = (u1)t; 481 } 482 483 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 484 485 // find local field, returns true if found 486 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 487 // find field in direct superinterfaces, returns the interface in which the field is defined 488 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 489 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 490 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 491 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 492 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 493 494 // find a non-static or static field given its offset within the class. 495 bool contains_field_offset(int offset) { 496 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); 497 } 498 499 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 500 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 501 502 // find a local method (returns NULL if not found) 503 Method* find_method(Symbol* name, Symbol* signature) const; 504 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature); 505 506 // lookup operation (returns NULL if not found) 507 Method* uncached_lookup_method(Symbol* name, Symbol* signature) const; 508 509 // lookup a method in all the interfaces that this class implements 510 // (returns NULL if not found) 511 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const; 512 513 // Find method indices by name. If a method with the specified name is 514 // found the index to the first method is returned, and 'end' is filled in 515 // with the index of first non-name-matching method. If no method is found 516 // -1 is returned. 517 int find_method_by_name(Symbol* name, int* end); 518 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end); 519 520 // constant pool 521 ConstantPool* constants() const { return _constants; } 522 void set_constants(ConstantPool* c) { _constants = c; } 523 524 // protection domain 525 oop protection_domain() { return _protection_domain; } 526 void set_protection_domain(oop pd) { klass_oop_store(&_protection_domain, pd); } 527 528 // host class 529 Klass* host_klass() const { 530 Klass** hk = (Klass**)adr_host_klass(); 531 if (hk == NULL) { 532 return NULL; 533 } else { 534 return *hk; 535 } 536 } 537 void set_host_klass(Klass* host) { 538 assert(is_anonymous(), "not anonymous"); 539 Klass** addr = (Klass**)adr_host_klass(); 540 assert(addr != NULL, "no reversed space"); 541 *addr = host; 542 } 543 bool is_anonymous() const { 544 return (_misc_flags & _misc_is_anonymous) != 0; 545 } 546 void set_is_anonymous(bool value) { 547 if (value) { 548 _misc_flags |= _misc_is_anonymous; 549 } else { 550 _misc_flags &= ~_misc_is_anonymous; 551 } 552 } 553 554 // Oop that keeps the metadata for this class from being unloaded 555 // in places where the metadata is stored in other places, like nmethods 556 oop klass_holder() const { 557 return is_anonymous() ? java_mirror() : class_loader(); 558 } 559 560 bool is_contended() const { 561 return (_misc_flags & _misc_is_contended) != 0; 562 } 563 void set_is_contended(bool value) { 564 if (value) { 565 _misc_flags |= _misc_is_contended; 566 } else { 567 _misc_flags &= ~_misc_is_contended; 568 } 569 } 570 571 // signers 572 objArrayOop signers() const { return _signers; } 573 void set_signers(objArrayOop s) { klass_oop_store((oop*)&_signers, s); } 574 575 // source file name 576 Symbol* source_file_name() const { return _source_file_name; } 577 void set_source_file_name(Symbol* n); 578 579 // minor and major version numbers of class file 580 u2 minor_version() const { return _minor_version; } 581 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 582 u2 major_version() const { return _major_version; } 583 void set_major_version(u2 major_version) { _major_version = major_version; } 584 585 // source debug extension 586 char* source_debug_extension() const { return _source_debug_extension; } 587 void set_source_debug_extension(char* array, int length); 588 589 // symbol unloading support (refcount already added) 590 Symbol* array_name() { return _array_name; } 591 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; } 592 593 // nonstatic oop-map blocks 594 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 595 return oop_map_count * OopMapBlock::size_in_words(); 596 } 597 unsigned int nonstatic_oop_map_count() const { 598 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 599 } 600 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 601 void set_nonstatic_oop_map_size(int words) { 602 _nonstatic_oop_map_size = words; 603 } 604 605 // RedefineClasses() support for previous versions: 606 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods, 607 int emcp_method_count); 608 // If the _previous_versions array is non-NULL, then this klass 609 // has been redefined at least once even if we aren't currently 610 // tracking a previous version. 611 bool has_been_redefined() const { return _previous_versions != NULL; } 612 bool has_previous_version() const; 613 void init_previous_versions() { 614 _previous_versions = NULL; 615 } 616 GrowableArray<PreviousVersionNode *>* previous_versions() const { 617 return _previous_versions; 618 } 619 620 static void purge_previous_versions(InstanceKlass* ik); 621 622 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 623 void set_cached_class_file(unsigned char *class_file_bytes, 624 jint class_file_len) { _cached_class_file_len = class_file_len; 625 _cached_class_file_bytes = class_file_bytes; } 626 jint get_cached_class_file_len() { return _cached_class_file_len; } 627 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; } 628 629 // JVMTI: Support for caching of field indices, types, and offsets 630 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 631 _jvmti_cached_class_field_map = descriptor; 632 } 633 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 634 return _jvmti_cached_class_field_map; 635 } 636 637 bool has_default_methods() const { 638 return (_misc_flags & _misc_has_default_methods) != 0; 639 } 640 void set_has_default_methods(bool b) { 641 if (b) { 642 _misc_flags |= _misc_has_default_methods; 643 } else { 644 _misc_flags &= ~_misc_has_default_methods; 645 } 646 } 647 648 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 649 inline u2 next_method_idnum(); 650 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 651 652 // generics support 653 Symbol* generic_signature() const { return _generic_signature; } 654 void set_generic_signature(Symbol* sig) { _generic_signature = sig; } 655 656 u2 enclosing_method_data(int offset); 657 u2 enclosing_method_class_index() { 658 return enclosing_method_data(enclosing_method_class_index_offset); 659 } 660 u2 enclosing_method_method_index() { 661 return enclosing_method_data(enclosing_method_method_index_offset); 662 } 663 void set_enclosing_method_indices(u2 class_index, 664 u2 method_index); 665 666 // jmethodID support 667 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, 668 methodHandle method_h); 669 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h, 670 size_t idnum, jmethodID new_id, jmethodID* new_jmeths, 671 jmethodID* to_dealloc_id_p, 672 jmethodID** to_dealloc_jmeths_p); 673 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 674 size_t *length_p, jmethodID* id_p); 675 jmethodID jmethod_id_or_null(Method* method); 676 677 // cached itable index support 678 void set_cached_itable_index(size_t idnum, int index); 679 int cached_itable_index(size_t idnum); 680 681 // annotations support 682 Annotations* annotations() const { return _annotations; } 683 void set_annotations(Annotations* anno) { _annotations = anno; } 684 685 AnnotationArray* class_annotations() const { 686 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 687 } 688 Array<AnnotationArray*>* fields_annotations() const { 689 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 690 } 691 AnnotationArray* class_type_annotations() const { 692 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 693 } 694 Array<AnnotationArray*>* fields_type_annotations() const { 695 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 696 } 697 // allocation 698 instanceOop allocate_instance(TRAPS); 699 700 // additional member function to return a handle 701 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } 702 703 objArrayOop allocate_objArray(int n, int length, TRAPS); 704 // Helper function 705 static instanceOop register_finalizer(instanceOop i, TRAPS); 706 707 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 708 // if not, throw either an Error or an Exception. 709 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 710 711 // initialization 712 void call_class_initializer(TRAPS); 713 void set_initialization_state_and_notify(ClassState state, TRAPS); 714 715 // OopMapCache support 716 OopMapCache* oop_map_cache() { return _oop_map_cache; } 717 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 718 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry); 719 720 // JNI identifier support (for static fields - for jni performance) 721 JNIid* jni_ids() { return _jni_ids; } 722 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 723 JNIid* jni_id_for(int offset); 724 725 // maintenance of deoptimization dependencies 726 int mark_dependent_nmethods(DepChange& changes); 727 void add_dependent_nmethod(nmethod* nm); 728 void remove_dependent_nmethod(nmethod* nm); 729 730 // On-stack replacement support 731 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 732 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 733 void add_osr_nmethod(nmethod* n); 734 void remove_osr_nmethod(nmethod* n); 735 nmethod* lookup_osr_nmethod(Method* const m, int bci, int level, bool match_level) const; 736 737 // Breakpoint support (see methods on Method* for details) 738 BreakpointInfo* breakpoints() const { return _breakpoints; }; 739 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 740 741 // support for stub routines 742 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 743 TRACE_DEFINE_OFFSET; 744 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 745 746 // subclass/subinterface checks 747 bool implements_interface(Klass* k) const; 748 749 // Access to the implementor of an interface. 750 Klass* implementor() const 751 { 752 Klass** k = adr_implementor(); 753 if (k == NULL) { 754 return NULL; 755 } else { 756 return *k; 757 } 758 } 759 760 void set_implementor(Klass* k) { 761 assert(is_interface(), "not interface"); 762 Klass** addr = adr_implementor(); 763 *addr = k; 764 } 765 766 int nof_implementors() const { 767 Klass* k = implementor(); 768 if (k == NULL) { 769 return 0; 770 } else if (k != this) { 771 return 1; 772 } else { 773 return 2; 774 } 775 } 776 777 void add_implementor(Klass* k); // k is a new class that implements this interface 778 void init_implementor(); // initialize 779 780 // link this class into the implementors list of every interface it implements 781 void process_interfaces(Thread *thread); 782 783 // virtual operations from Klass 784 bool is_leaf_class() const { return _subklass == NULL; } 785 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); 786 bool compute_is_subtype_of(Klass* k); 787 bool can_be_primary_super_slow() const; 788 int oop_size(oop obj) const { return size_helper(); } 789 bool oop_is_instance_slow() const { return true; } 790 791 // Iterators 792 void do_local_static_fields(FieldClosure* cl); 793 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 794 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS); 795 796 void methods_do(void f(Method* method)); 797 void array_klasses_do(void f(Klass* k)); 798 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 799 void with_array_klasses_do(void f(Klass* k)); 800 bool super_types_do(SuperTypeClosure* blk); 801 802 // Casting from Klass* 803 static InstanceKlass* cast(Klass* k) { 804 assert(k->is_klass(), "must be"); 805 assert(k->oop_is_instance(), "cast to InstanceKlass"); 806 return (InstanceKlass*) k; 807 } 808 809 InstanceKlass* java_super() const { 810 return (super() == NULL) ? NULL : cast(super()); 811 } 812 813 // Sizing (in words) 814 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); } 815 816 static int size(int vtable_length, int itable_length, 817 int nonstatic_oop_map_size, 818 bool is_interface, bool is_anonymous) { 819 return align_object_size(header_size() + 820 align_object_offset(vtable_length) + 821 align_object_offset(itable_length) + 822 ((is_interface || is_anonymous) ? 823 align_object_offset(nonstatic_oop_map_size) : 824 nonstatic_oop_map_size) + 825 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) + 826 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0)); 827 } 828 int size() const { return size(vtable_length(), 829 itable_length(), 830 nonstatic_oop_map_size(), 831 is_interface(), 832 is_anonymous()); 833 } 834#if INCLUDE_SERVICES 835 virtual void collect_statistics(KlassSizeStats *sz) const; 836#endif 837 838 static int vtable_start_offset() { return header_size(); } 839 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; } 840 841 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); } 842 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); } 843 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 844 845 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 846 847 address static_field_addr(int offset); 848 849 OopMapBlock* start_of_nonstatic_oop_maps() const { 850 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length())); 851 } 852 853 Klass** end_of_nonstatic_oop_maps() const { 854 return (Klass**)(start_of_nonstatic_oop_maps() + 855 nonstatic_oop_map_count()); 856 } 857 858 Klass** adr_implementor() const { 859 if (is_interface()) { 860 return (Klass**)end_of_nonstatic_oop_maps(); 861 } else { 862 return NULL; 863 } 864 }; 865 866 Klass** adr_host_klass() const { 867 if (is_anonymous()) { 868 Klass** adr_impl = adr_implementor(); 869 if (adr_impl != NULL) { 870 return adr_impl + 1; 871 } else { 872 return end_of_nonstatic_oop_maps(); 873 } 874 } else { 875 return NULL; 876 } 877 } 878 879 // Allocation profiling support 880 juint alloc_size() const { return _alloc_count * size_helper(); } 881 void set_alloc_size(juint n) {} 882 883 // Use this to return the size of an instance in heap words: 884 int size_helper() const { 885 return layout_helper_to_size_helper(layout_helper()); 886 } 887 888 // This bit is initialized in classFileParser.cpp. 889 // It is false under any of the following conditions: 890 // - the class is abstract (including any interface) 891 // - the class has a finalizer (if !RegisterFinalizersAtInit) 892 // - the class size is larger than FastAllocateSizeLimit 893 // - the class is java/lang/Class, which cannot be allocated directly 894 bool can_be_fastpath_allocated() const { 895 return !layout_helper_needs_slow_path(layout_helper()); 896 } 897 898 // Java vtable/itable 899 klassVtable* vtable() const; // return new klassVtable wrapper 900 inline Method* method_at_vtable(int index); 901 klassItable* itable() const; // return new klassItable wrapper 902 Method* method_at_itable(Klass* holder, int index, TRAPS); 903 904 // Garbage collection 905 virtual void oops_do(OopClosure* cl); 906 907 void oop_follow_contents(oop obj); 908 int oop_adjust_pointers(oop obj); 909 910 void clean_implementors_list(BoolObjectClosure* is_alive); 911 void clean_method_data(BoolObjectClosure* is_alive); 912 913 // Explicit metaspace deallocation of fields 914 // For RedefineClasses, we need to deallocate instanceKlasses 915 void deallocate_contents(ClassLoaderData* loader_data); 916 917 // The constant pool is on stack if any of the methods are executing or 918 // referenced by handles. 919 bool on_stack() const { return _constants->on_stack(); } 920 921 void release_C_heap_structures(); 922 923 // Parallel Scavenge and Parallel Old 924 PARALLEL_GC_DECLS 925 926 // Naming 927 const char* signature_name() const; 928 929 // Iterators 930 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) { 931 return oop_oop_iterate_v(obj, blk); 932 } 933 934 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) { 935 return oop_oop_iterate_v_m(obj, blk, mr); 936 } 937 938#define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ 939 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ 940 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \ 941 MemRegion mr); 942 943 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL) 944 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL) 945 946#if INCLUDE_ALL_GCS 947#define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ 948 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); 949 950 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 951 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 952#endif // INCLUDE_ALL_GCS 953 954 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 955private: 956 // initialization state 957#ifdef ASSERT 958 void set_init_state(ClassState state); 959#else 960 void set_init_state(ClassState state) { _init_state = (u1)state; } 961#endif 962 void set_rewritten() { _misc_flags |= _misc_rewritten; } 963 void set_init_thread(Thread *thread) { _init_thread = thread; } 964 965 // The RedefineClasses() API can cause new method idnums to be needed 966 // which will cause the caches to grow. Safety requires different 967 // cache management logic if the caches can grow instead of just 968 // going from NULL to non-NULL. 969 bool idnum_can_increment() const { return has_been_redefined(); } 970 jmethodID* methods_jmethod_ids_acquire() const 971 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); } 972 void release_set_methods_jmethod_ids(jmethodID* jmeths) 973 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); } 974 975 int* methods_cached_itable_indices_acquire() const 976 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); } 977 void release_set_methods_cached_itable_indices(int* indices) 978 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); } 979 980 // Lock during initialization 981 volatile oop init_lock() const; 982 void set_init_lock(oop value) { klass_oop_store(&_init_lock, value); } 983 void fence_and_clear_init_lock(); // after fully_initialized 984 985 // Offsets for memory management 986 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;} 987 oop* adr_signers() const { return (oop*)&this->_signers;} 988 oop* adr_init_lock() const { return (oop*)&this->_init_lock;} 989 990 // Static methods that are used to implement member methods where an exposed this pointer 991 // is needed due to possible GCs 992 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); 993 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); 994 static void initialize_impl (instanceKlassHandle this_oop, TRAPS); 995 static void eager_initialize_impl (instanceKlassHandle this_oop); 996 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS); 997 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS); 998 static Klass* array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS); 999 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS); 1000 /* jni_id_for_impl for jfieldID only */ 1001 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset); 1002 1003 // Returns the array class for the n'th dimension 1004 Klass* array_klass_impl(bool or_null, int n, TRAPS); 1005 1006 // Returns the array class with this class as element type 1007 Klass* array_klass_impl(bool or_null, TRAPS); 1008 1009public: 1010 // CDS support - remove and restore oops from metadata. Oops are not shared. 1011 virtual void remove_unshareable_info(); 1012 virtual void restore_unshareable_info(TRAPS); 1013 1014 // jvm support 1015 jint compute_modifier_flags(TRAPS) const; 1016 1017public: 1018 // JVMTI support 1019 jint jvmti_class_status() const; 1020 1021 public: 1022 // Printing 1023#ifndef PRODUCT 1024 void print_on(outputStream* st) const; 1025#endif 1026 void print_value_on(outputStream* st) const; 1027 1028 void oop_print_value_on(oop obj, outputStream* st); 1029 1030#ifndef PRODUCT 1031 void oop_print_on (oop obj, outputStream* st); 1032 1033 void print_dependent_nmethods(bool verbose = false); 1034 bool is_dependent_nmethod(nmethod* nm); 1035#endif 1036 1037 const char* internal_name() const; 1038 1039 // Verification 1040 void verify_on(outputStream* st); 1041 1042 void oop_verify_on(oop obj, outputStream* st); 1043}; 1044 1045inline Method* InstanceKlass::method_at_vtable(int index) { 1046#ifndef PRODUCT 1047 assert(index >= 0, "valid vtable index"); 1048 if (DebugVtables) { 1049 verify_vtable_index(index); 1050 } 1051#endif 1052 vtableEntry* ve = (vtableEntry*)start_of_vtable(); 1053 return ve[index].method(); 1054} 1055 1056// for adding methods 1057// UNSET_IDNUM return means no more ids available 1058inline u2 InstanceKlass::next_method_idnum() { 1059 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1060 return ConstMethod::UNSET_IDNUM; // no more ids available 1061 } else { 1062 return _idnum_allocated_count++; 1063 } 1064} 1065 1066 1067/* JNIid class for jfieldIDs only */ 1068class JNIid: public CHeapObj<mtClass> { 1069 friend class VMStructs; 1070 private: 1071 Klass* _holder; 1072 JNIid* _next; 1073 int _offset; 1074#ifdef ASSERT 1075 bool _is_static_field_id; 1076#endif 1077 1078 public: 1079 // Accessors 1080 Klass* holder() const { return _holder; } 1081 int offset() const { return _offset; } 1082 JNIid* next() { return _next; } 1083 // Constructor 1084 JNIid(Klass* holder, int offset, JNIid* next); 1085 // Identifier lookup 1086 JNIid* find(int offset); 1087 1088 bool find_local_field(fieldDescriptor* fd) { 1089 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1090 } 1091 1092 static void deallocate(JNIid* id); 1093 // Debugging 1094#ifdef ASSERT 1095 bool is_static_field_id() const { return _is_static_field_id; } 1096 void set_is_static_field_id() { _is_static_field_id = true; } 1097#endif 1098 void verify(Klass* holder); 1099}; 1100 1101 1102// If breakpoints are more numerous than just JVMTI breakpoints, 1103// consider compressing this data structure. 1104// It is currently a simple linked list defined in method.hpp. 1105 1106class BreakpointInfo; 1107 1108 1109// A collection point for interesting information about the previous 1110// version(s) of an InstanceKlass. This class uses weak references to 1111// the information so that the information may be collected as needed 1112// by the system. If the information is shared, then a regular 1113// reference must be used because a weak reference would be seen as 1114// collectible. A GrowableArray of PreviousVersionNodes is attached 1115// to the InstanceKlass as needed. See PreviousVersionWalker below. 1116class PreviousVersionNode : public CHeapObj<mtClass> { 1117 private: 1118 // A shared ConstantPool is never collected so we'll always have 1119 // a reference to it so we can update items in the cache. We'll 1120 // have a weak reference to a non-shared ConstantPool until all 1121 // of the methods (EMCP or obsolete) have been collected; the 1122 // non-shared ConstantPool becomes collectible at that point. 1123 ConstantPool* _prev_constant_pool; // regular or weak reference 1124 bool _prev_cp_is_weak; // true if not a shared ConstantPool 1125 1126 // If the previous version of the InstanceKlass doesn't have any 1127 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the 1128 // EMCP methods have been collected, then _prev_EMCP_methods can 1129 // have a length of zero. 1130 GrowableArray<Method*>* _prev_EMCP_methods; 1131 1132public: 1133 PreviousVersionNode(ConstantPool* prev_constant_pool, bool prev_cp_is_weak, 1134 GrowableArray<Method*>* prev_EMCP_methods); 1135 ~PreviousVersionNode(); 1136 ConstantPool* prev_constant_pool() const { 1137 return _prev_constant_pool; 1138 } 1139 GrowableArray<Method*>* prev_EMCP_methods() const { 1140 return _prev_EMCP_methods; 1141 } 1142}; 1143 1144 1145// A Handle-ized version of PreviousVersionNode. 1146class PreviousVersionInfo : public ResourceObj { 1147 private: 1148 constantPoolHandle _prev_constant_pool_handle; 1149 // If the previous version of the InstanceKlass doesn't have any 1150 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the 1151 // methods cannot be collected while we hold a handle, 1152 // _prev_EMCP_methods should never have a length of zero. 1153 GrowableArray<methodHandle>* _prev_EMCP_method_handles; 1154 1155public: 1156 PreviousVersionInfo(PreviousVersionNode *pv_node); 1157 ~PreviousVersionInfo(); 1158 constantPoolHandle prev_constant_pool_handle() const { 1159 return _prev_constant_pool_handle; 1160 } 1161 GrowableArray<methodHandle>* prev_EMCP_method_handles() const { 1162 return _prev_EMCP_method_handles; 1163 } 1164}; 1165 1166 1167// Helper object for walking previous versions. This helper cleans up 1168// the Handles that it allocates when the helper object is destroyed. 1169// The PreviousVersionInfo object returned by next_previous_version() 1170// is only valid until a subsequent call to next_previous_version() or 1171// the helper object is destroyed. 1172class PreviousVersionWalker : public StackObj { 1173 private: 1174 GrowableArray<PreviousVersionNode *>* _previous_versions; 1175 int _current_index; 1176 // Fields for cleaning up when we are done walking the previous versions: 1177 // A HandleMark for the PreviousVersionInfo handles: 1178 HandleMark _hm; 1179 1180 // It would be nice to have a ResourceMark field in this helper also, 1181 // but the ResourceMark code says to be careful to delete handles held 1182 // in GrowableArrays _before_ deleting the GrowableArray. Since we 1183 // can't guarantee the order in which the fields are destroyed, we 1184 // have to let the creator of the PreviousVersionWalker object do 1185 // the right thing. Also, adding a ResourceMark here causes an 1186 // include loop. 1187 1188 // A pointer to the current info object so we can handle the deletes. 1189 PreviousVersionInfo * _current_p; 1190 1191 public: 1192 PreviousVersionWalker(InstanceKlass *ik); 1193 ~PreviousVersionWalker(); 1194 1195 // Return the interesting information for the next previous version 1196 // of the klass. Returns NULL if there are no more previous versions. 1197 PreviousVersionInfo* next_previous_version(); 1198}; 1199 1200 1201// 1202// nmethodBucket is used to record dependent nmethods for 1203// deoptimization. nmethod dependencies are actually <klass, method> 1204// pairs but we really only care about the klass part for purposes of 1205// finding nmethods which might need to be deoptimized. Instead of 1206// recording the method, a count of how many times a particular nmethod 1207// was recorded is kept. This ensures that any recording errors are 1208// noticed since an nmethod should be removed as many times are it's 1209// added. 1210// 1211class nmethodBucket: public CHeapObj<mtClass> { 1212 friend class VMStructs; 1213 private: 1214 nmethod* _nmethod; 1215 int _count; 1216 nmethodBucket* _next; 1217 1218 public: 1219 nmethodBucket(nmethod* nmethod, nmethodBucket* next) { 1220 _nmethod = nmethod; 1221 _next = next; 1222 _count = 1; 1223 } 1224 int count() { return _count; } 1225 int increment() { _count += 1; return _count; } 1226 int decrement() { _count -= 1; assert(_count >= 0, "don't underflow"); return _count; } 1227 nmethodBucket* next() { return _next; } 1228 void set_next(nmethodBucket* b) { _next = b; } 1229 nmethod* get_nmethod() { return _nmethod; } 1230}; 1231 1232// An iterator that's used to access the inner classes indices in the 1233// InstanceKlass::_inner_classes array. 1234class InnerClassesIterator : public StackObj { 1235 private: 1236 Array<jushort>* _inner_classes; 1237 int _length; 1238 int _idx; 1239 public: 1240 1241 InnerClassesIterator(instanceKlassHandle k) { 1242 _inner_classes = k->inner_classes(); 1243 if (k->inner_classes() != NULL) { 1244 _length = _inner_classes->length(); 1245 // The inner class array's length should be the multiple of 1246 // inner_class_next_offset if it only contains the InnerClasses 1247 // attribute data, or it should be 1248 // n*inner_class_next_offset+enclosing_method_attribute_size 1249 // if it also contains the EnclosingMethod data. 1250 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1251 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1252 "just checking"); 1253 // Remove the enclosing_method portion if exists. 1254 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1255 _length -= InstanceKlass::enclosing_method_attribute_size; 1256 } 1257 } else { 1258 _length = 0; 1259 } 1260 _idx = 0; 1261 } 1262 1263 int length() const { 1264 return _length; 1265 } 1266 1267 void next() { 1268 _idx += InstanceKlass::inner_class_next_offset; 1269 } 1270 1271 bool done() const { 1272 return (_idx >= _length); 1273 } 1274 1275 u2 inner_class_info_index() const { 1276 return _inner_classes->at( 1277 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1278 } 1279 1280 void set_inner_class_info_index(u2 index) { 1281 _inner_classes->at_put( 1282 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1283 } 1284 1285 u2 outer_class_info_index() const { 1286 return _inner_classes->at( 1287 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1288 } 1289 1290 void set_outer_class_info_index(u2 index) { 1291 _inner_classes->at_put( 1292 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1293 } 1294 1295 u2 inner_name_index() const { 1296 return _inner_classes->at( 1297 _idx + InstanceKlass::inner_class_inner_name_offset); 1298 } 1299 1300 void set_inner_name_index(u2 index) { 1301 _inner_classes->at_put( 1302 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1303 } 1304 1305 u2 inner_access_flags() const { 1306 return _inner_classes->at( 1307 _idx + InstanceKlass::inner_class_access_flags_offset); 1308 } 1309}; 1310 1311#endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP 1312