instanceKlass.hpp revision 4074:44c5fcd9cb25
1/* 2 * Copyright (c) 1997, 2012, 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 40// An InstanceKlass is the VM level representation of a Java class. 41// It contains all information needed for at class at execution runtime. 42 43// InstanceKlass layout: 44// [C++ vtbl pointer ] Klass 45// [subtype cache ] Klass 46// [instance size ] Klass 47// [java mirror ] Klass 48// [super ] Klass 49// [access_flags ] Klass 50// [name ] Klass 51// [first subklass ] Klass 52// [next sibling ] Klass 53// [array klasses ] 54// [methods ] 55// [local interfaces ] 56// [transitive interfaces ] 57// [fields ] 58// [constants ] 59// [class loader ] 60// [protection domain ] 61// [signers ] 62// [source file name ] 63// [inner classes ] 64// [static field size ] 65// [nonstatic field size ] 66// [static oop fields size ] 67// [nonstatic oop maps size ] 68// [has finalize method ] 69// [deoptimization mark bit ] 70// [initialization state ] 71// [initializing thread ] 72// [Java vtable length ] 73// [oop map cache (stack maps) ] 74// [EMBEDDED Java vtable ] size in words = vtable_len 75// [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size 76// The embedded nonstatic oop-map blocks are short pairs (offset, length) 77// indicating where oops are located in instances of this klass. 78// [EMBEDDED implementor of the interface] only exist for interface 79// [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled) 80 81 82// forward declaration for class -- see below for definition 83class SuperTypeClosure; 84class JNIid; 85class jniIdMapBase; 86class BreakpointInfo; 87class fieldDescriptor; 88class DepChange; 89class nmethodBucket; 90class PreviousVersionNode; 91class JvmtiCachedClassFieldMap; 92 93// This is used in iterators below. 94class FieldClosure: public StackObj { 95public: 96 virtual void do_field(fieldDescriptor* fd) = 0; 97}; 98 99#ifndef PRODUCT 100// Print fields. 101// If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. 102class FieldPrinter: public FieldClosure { 103 oop _obj; 104 outputStream* _st; 105 public: 106 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} 107 void do_field(fieldDescriptor* fd); 108}; 109#endif // !PRODUCT 110 111// ValueObjs embedded in klass. Describes where oops are located in instances of 112// this klass. 113class OopMapBlock VALUE_OBJ_CLASS_SPEC { 114 public: 115 // Byte offset of the first oop mapped by this block. 116 int offset() const { return _offset; } 117 void set_offset(int offset) { _offset = offset; } 118 119 // Number of oops in this block. 120 uint count() const { return _count; } 121 void set_count(uint count) { _count = count; } 122 123 // sizeof(OopMapBlock) in HeapWords. 124 static const int size_in_words() { 125 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >> 126 LogHeapWordSize; 127 } 128 129 private: 130 int _offset; 131 uint _count; 132}; 133 134class InstanceKlass: public Klass { 135 friend class VMStructs; 136 friend class ClassFileParser; 137 friend class CompileReplay; 138 139 protected: 140 // Constructor 141 InstanceKlass(int vtable_len, 142 int itable_len, 143 int static_field_size, 144 int nonstatic_oop_map_size, 145 ReferenceType rt, 146 AccessFlags access_flags, 147 bool is_anonymous); 148 public: 149 static Klass* allocate_instance_klass(ClassLoaderData* loader_data, 150 int vtable_len, 151 int itable_len, 152 int static_field_size, 153 int nonstatic_oop_map_size, 154 ReferenceType rt, 155 AccessFlags access_flags, 156 Symbol* name, 157 Klass* super_klass, 158 KlassHandle host_klass, 159 TRAPS); 160 161 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } 162 163 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 164 // of the class loading & initialization procedure, and the use of the states. 165 enum ClassState { 166 allocated, // allocated (but not yet linked) 167 loaded, // loaded and inserted in class hierarchy (but not linked yet) 168 linked, // successfully linked/verified (but not initialized yet) 169 being_initialized, // currently running class initializer 170 fully_initialized, // initialized (successfull final state) 171 initialization_error // error happened during initialization 172 }; 173 174 static int number_of_instance_classes() { return _total_instanceKlass_count; } 175 176 private: 177 static volatile int _total_instanceKlass_count; 178 179 protected: 180 // Protection domain. 181 oop _protection_domain; 182 // Class signers. 183 objArrayOop _signers; 184 // Initialization lock. Must be one per class and it has to be a VM internal 185 // object so java code cannot lock it (like the mirror) 186 // It has to be an object not a Mutex because it's held through java calls. 187 volatile oop _init_lock; 188 189 // Annotations for this class 190 Annotations* _annotations; 191 // Array classes holding elements of this class. 192 Klass* _array_klasses; 193 // Constant pool for this class. 194 ConstantPool* _constants; 195 // The InnerClasses attribute and EnclosingMethod attribute. The 196 // _inner_classes is an array of shorts. If the class has InnerClasses 197 // attribute, then the _inner_classes array begins with 4-tuples of shorts 198 // [inner_class_info_index, outer_class_info_index, 199 // inner_name_index, inner_class_access_flags] for the InnerClasses 200 // attribute. If the EnclosingMethod attribute exists, it occupies the 201 // last two shorts [class_index, method_index] of the array. If only 202 // the InnerClasses attribute exists, the _inner_classes array length is 203 // number_of_inner_classes * 4. If the class has both InnerClasses 204 // and EnclosingMethod attributes the _inner_classes array length is 205 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 206 Array<jushort>* _inner_classes; 207 208 // Name of source file containing this klass, NULL if not specified. 209 Symbol* _source_file_name; 210 // the source debug extension for this klass, NULL if not specified. 211 // Specified as UTF-8 string without terminating zero byte in the classfile, 212 // it is stored in the instanceklass as a NULL-terminated UTF-8 string 213 char* _source_debug_extension; 214 // Generic signature, or null if none. 215 Symbol* _generic_signature; 216 // Array name derived from this class which needs unreferencing 217 // if this class is unloaded. 218 Symbol* _array_name; 219 220 // Number of heapOopSize words used by non-static fields in this klass 221 // (including inherited fields but after header_size()). 222 int _nonstatic_field_size; 223 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 224 u2 _static_oop_field_count;// number of static oop fields in this klass 225 u2 _java_fields_count; // The number of declared Java fields 226 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 227 228 // _is_marked_dependent can be set concurrently, thus cannot be part of the 229 // _misc_flags. 230 bool _is_marked_dependent; // used for marking during flushing and deoptimization 231 232 enum { 233 _misc_rewritten = 1 << 0, // methods rewritten. 234 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops 235 _misc_should_verify_class = 1 << 2, // allow caching of preverification 236 _misc_is_anonymous = 1 << 3, // has embedded _inner_classes field 237 _misc_is_contended = 1 << 4, // marked with contended annotation 238 _misc_has_default_methods = 1 << 5 // class/superclass/implemented interfaces has default methods 239 }; 240 u2 _misc_flags; 241 u2 _minor_version; // minor version number of class file 242 u2 _major_version; // major version number of class file 243 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) 244 int _vtable_len; // length of Java vtable (in words) 245 int _itable_len; // length of Java itable (in words) 246 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 247 JNIid* _jni_ids; // First JNI identifier for static fields in this class 248 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 249 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL 250 nmethodBucket* _dependencies; // list of dependent nmethods 251 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 252 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 253 // Array of interesting part(s) of the previous version(s) of this 254 // InstanceKlass. See PreviousVersionWalker below. 255 GrowableArray<PreviousVersionNode *>* _previous_versions; 256 // JVMTI fields can be moved to their own structure - see 6315920 257 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH 258 jint _cached_class_file_len; // JVMTI: length of above 259 260 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 261 262 // Class states are defined as ClassState (see above). 263 // Place the _init_state here to utilize the unused 2-byte after 264 // _idnum_allocated_count. 265 u1 _init_state; // state of class 266 u1 _reference_type; // reference type 267 268 269 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 270 271 // Method array. 272 Array<Method*>* _methods; 273 // Interface (Klass*s) this class declares locally to implement. 274 Array<Klass*>* _local_interfaces; 275 // Interface (Klass*s) this class implements transitively. 276 Array<Klass*>* _transitive_interfaces; 277 // Int array containing the original order of method in the class file (for JVMTI). 278 Array<int>* _method_ordering; 279 // Instance and static variable information, starts with 6-tuples of shorts 280 // [access, name index, sig index, initval index, low_offset, high_offset] 281 // for all fields, followed by the generic signature data at the end of 282 // the array. Only fields with generic signature attributes have the generic 283 // signature data set in the array. The fields array looks like following: 284 // 285 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 286 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 287 // ... 288 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 289 // [generic signature index] 290 // [generic signature index] 291 // ... 292 Array<u2>* _fields; 293 294 // embedded Java vtable follows here 295 // embedded Java itables follows here 296 // embedded static fields follows here 297 // embedded nonstatic oop-map blocks follows here 298 // embedded implementor of this interface follows here 299 // The embedded implementor only exists if the current klass is an 300 // iterface. The possible values of the implementor fall into following 301 // three cases: 302 // NULL: no implementor. 303 // A Klass* that's not itself: one implementor. 304 // Itsef: more than one implementors. 305 // embedded host klass follows here 306 // The embedded host klass only exists in an anonymous class for 307 // dynamic language support (JSR 292 enabled). The host class grants 308 // its access privileges to this class also. The host class is either 309 // named, or a previously loaded anonymous class. A non-anonymous class 310 // or an anonymous class loaded through normal classloading does not 311 // have this embedded field. 312 // 313 314 friend class SystemDictionary; 315 316 public: 317 bool has_nonstatic_fields() const { 318 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 319 } 320 void set_has_nonstatic_fields(bool b) { 321 if (b) { 322 _misc_flags |= _misc_has_nonstatic_fields; 323 } else { 324 _misc_flags &= ~_misc_has_nonstatic_fields; 325 } 326 } 327 328 // field sizes 329 int nonstatic_field_size() const { return _nonstatic_field_size; } 330 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 331 332 int static_field_size() const { return _static_field_size; } 333 void set_static_field_size(int size) { _static_field_size = size; } 334 335 int static_oop_field_count() const { return (int)_static_oop_field_count; } 336 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 337 338 // Java vtable 339 int vtable_length() const { return _vtable_len; } 340 void set_vtable_length(int len) { _vtable_len = len; } 341 342 // Java itable 343 int itable_length() const { return _itable_len; } 344 void set_itable_length(int len) { _itable_len = len; } 345 346 // array klasses 347 Klass* array_klasses() const { return _array_klasses; } 348 void set_array_klasses(Klass* k) { _array_klasses = k; } 349 350 // methods 351 Array<Method*>* methods() const { return _methods; } 352 void set_methods(Array<Method*>* a) { _methods = a; } 353 Method* method_with_idnum(int idnum); 354 355 // method ordering 356 Array<int>* method_ordering() const { return _method_ordering; } 357 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 358 359 // interfaces 360 Array<Klass*>* local_interfaces() const { return _local_interfaces; } 361 void set_local_interfaces(Array<Klass*>* a) { 362 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 363 _local_interfaces = a; } 364 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; } 365 void set_transitive_interfaces(Array<Klass*>* a) { 366 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 367 _transitive_interfaces = a; } 368 369 private: 370 friend class fieldDescriptor; 371 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 372 373 public: 374 int field_offset (int index) const { return field(index)->offset(); } 375 int field_access_flags(int index) const { return field(index)->access_flags(); } 376 Symbol* field_name (int index) const { return field(index)->name(constants()); } 377 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 378 379 // Number of Java declared fields 380 int java_fields_count() const { return (int)_java_fields_count; } 381 382 Array<u2>* fields() const { return _fields; } 383 384 void set_fields(Array<u2>* f, u2 java_fields_count) { 385 guarantee(_fields == NULL || f == NULL, "Just checking"); 386 _fields = f; 387 _java_fields_count = java_fields_count; 388 } 389 390 // inner classes 391 Array<u2>* inner_classes() const { return _inner_classes; } 392 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 393 394 enum InnerClassAttributeOffset { 395 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 396 inner_class_inner_class_info_offset = 0, 397 inner_class_outer_class_info_offset = 1, 398 inner_class_inner_name_offset = 2, 399 inner_class_access_flags_offset = 3, 400 inner_class_next_offset = 4 401 }; 402 403 enum EnclosingMethodAttributeOffset { 404 enclosing_method_class_index_offset = 0, 405 enclosing_method_method_index_offset = 1, 406 enclosing_method_attribute_size = 2 407 }; 408 409 // method override check 410 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 411 412 // package 413 bool is_same_class_package(Klass* class2); 414 bool is_same_class_package(oop classloader2, Symbol* classname2); 415 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2); 416 417 // find an enclosing class (defined where original code was, in jvm.cpp!) 418 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) { 419 instanceKlassHandle self(THREAD, this); 420 return compute_enclosing_class_impl(self, inner_is_member, THREAD); 421 } 422 static Klass* compute_enclosing_class_impl(instanceKlassHandle self, 423 bool* inner_is_member, TRAPS); 424 425 // tell if two classes have the same enclosing class (at package level) 426 bool is_same_package_member(Klass* class2, TRAPS) { 427 instanceKlassHandle self(THREAD, this); 428 return is_same_package_member_impl(self, class2, THREAD); 429 } 430 static bool is_same_package_member_impl(instanceKlassHandle self, 431 Klass* class2, TRAPS); 432 433 // initialization state 434 bool is_loaded() const { return _init_state >= loaded; } 435 bool is_linked() const { return _init_state >= linked; } 436 bool is_initialized() const { return _init_state == fully_initialized; } 437 bool is_not_initialized() const { return _init_state < being_initialized; } 438 bool is_being_initialized() const { return _init_state == being_initialized; } 439 bool is_in_error_state() const { return _init_state == initialization_error; } 440 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 441 ClassState init_state() { return (ClassState)_init_state; } 442 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 443 444 // defineClass specified verification 445 bool should_verify_class() const { 446 return (_misc_flags & _misc_should_verify_class) != 0; 447 } 448 void set_should_verify_class(bool value) { 449 if (value) { 450 _misc_flags |= _misc_should_verify_class; 451 } else { 452 _misc_flags &= ~_misc_should_verify_class; 453 } 454 } 455 456 // marking 457 bool is_marked_dependent() const { return _is_marked_dependent; } 458 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 459 460 // initialization (virtuals from Klass) 461 bool should_be_initialized() const; // means that initialize should be called 462 void initialize(TRAPS); 463 void link_class(TRAPS); 464 bool link_class_or_fail(TRAPS); // returns false on failure 465 void unlink_class(); 466 void rewrite_class(TRAPS); 467 void link_methods(TRAPS); 468 Method* class_initializer(); 469 470 // set the class to initialized if no static initializer is present 471 void eager_initialize(Thread *thread); 472 473 // reference type 474 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 475 void set_reference_type(ReferenceType t) { 476 assert(t == (u1)t, "overflow"); 477 _reference_type = (u1)t; 478 } 479 480 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 481 482 // find local field, returns true if found 483 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 484 // find field in direct superinterfaces, returns the interface in which the field is defined 485 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 486 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 487 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 488 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 489 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 490 491 // find a non-static or static field given its offset within the class. 492 bool contains_field_offset(int offset) { 493 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); 494 } 495 496 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 497 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 498 499 // find a local method (returns NULL if not found) 500 Method* find_method(Symbol* name, Symbol* signature) const; 501 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature); 502 503 // lookup operation (returns NULL if not found) 504 Method* uncached_lookup_method(Symbol* name, Symbol* signature) const; 505 506 // lookup a method in all the interfaces that this class implements 507 // (returns NULL if not found) 508 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const; 509 510 // Find method indices by name. If a method with the specified name is 511 // found the index to the first method is returned, and 'end' is filled in 512 // with the index of first non-name-matching method. If no method is found 513 // -1 is returned. 514 int find_method_by_name(Symbol* name, int* end); 515 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end); 516 517 // constant pool 518 ConstantPool* constants() const { return _constants; } 519 void set_constants(ConstantPool* c) { _constants = c; } 520 521 // protection domain 522 oop protection_domain() { return _protection_domain; } 523 void set_protection_domain(oop pd) { klass_oop_store(&_protection_domain, pd); } 524 525 // host class 526 Klass* host_klass() const { 527 Klass** hk = (Klass**)adr_host_klass(); 528 if (hk == NULL) { 529 return NULL; 530 } else { 531 return *hk; 532 } 533 } 534 void set_host_klass(Klass* host) { 535 assert(is_anonymous(), "not anonymous"); 536 Klass** addr = (Klass**)adr_host_klass(); 537 assert(addr != NULL, "no reversed space"); 538 *addr = host; 539 } 540 bool is_anonymous() const { 541 return (_misc_flags & _misc_is_anonymous) != 0; 542 } 543 void set_is_anonymous(bool value) { 544 if (value) { 545 _misc_flags |= _misc_is_anonymous; 546 } else { 547 _misc_flags &= ~_misc_is_anonymous; 548 } 549 } 550 551 // Oop that keeps the metadata for this class from being unloaded 552 // in places where the metadata is stored in other places, like nmethods 553 oop klass_holder() const { 554 return is_anonymous() ? java_mirror() : class_loader(); 555 } 556 557 bool is_contended() const { 558 return (_misc_flags & _misc_is_contended) != 0; 559 } 560 void set_is_contended(bool value) { 561 if (value) { 562 _misc_flags |= _misc_is_contended; 563 } else { 564 _misc_flags &= ~_misc_is_contended; 565 } 566 } 567 568 // signers 569 objArrayOop signers() const { return _signers; } 570 void set_signers(objArrayOop s) { klass_oop_store((oop*)&_signers, s); } 571 572 // source file name 573 Symbol* source_file_name() const { return _source_file_name; } 574 void set_source_file_name(Symbol* n); 575 576 // minor and major version numbers of class file 577 u2 minor_version() const { return _minor_version; } 578 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 579 u2 major_version() const { return _major_version; } 580 void set_major_version(u2 major_version) { _major_version = major_version; } 581 582 // source debug extension 583 char* source_debug_extension() const { return _source_debug_extension; } 584 void set_source_debug_extension(char* array, int length); 585 586 // symbol unloading support (refcount already added) 587 Symbol* array_name() { return _array_name; } 588 void set_array_name(Symbol* name) { assert(_array_name == NULL, "name already created"); _array_name = name; } 589 590 // nonstatic oop-map blocks 591 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 592 return oop_map_count * OopMapBlock::size_in_words(); 593 } 594 unsigned int nonstatic_oop_map_count() const { 595 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 596 } 597 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 598 void set_nonstatic_oop_map_size(int words) { 599 _nonstatic_oop_map_size = words; 600 } 601 602 // RedefineClasses() support for previous versions: 603 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods, 604 int emcp_method_count); 605 // If the _previous_versions array is non-NULL, then this klass 606 // has been redefined at least once even if we aren't currently 607 // tracking a previous version. 608 bool has_been_redefined() const { return _previous_versions != NULL; } 609 bool has_previous_version() const; 610 void init_previous_versions() { 611 _previous_versions = NULL; 612 } 613 GrowableArray<PreviousVersionNode *>* previous_versions() const { 614 return _previous_versions; 615 } 616 617 static void purge_previous_versions(InstanceKlass* ik); 618 619 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 620 void set_cached_class_file(unsigned char *class_file_bytes, 621 jint class_file_len) { _cached_class_file_len = class_file_len; 622 _cached_class_file_bytes = class_file_bytes; } 623 jint get_cached_class_file_len() { return _cached_class_file_len; } 624 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; } 625 626 // JVMTI: Support for caching of field indices, types, and offsets 627 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 628 _jvmti_cached_class_field_map = descriptor; 629 } 630 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 631 return _jvmti_cached_class_field_map; 632 } 633 634 bool has_default_methods() const { 635 return (_misc_flags & _misc_has_default_methods) != 0; 636 } 637 void set_has_default_methods(bool b) { 638 if (b) { 639 _misc_flags |= _misc_has_default_methods; 640 } else { 641 _misc_flags &= ~_misc_has_default_methods; 642 } 643 } 644 645 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 646 inline u2 next_method_idnum(); 647 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 648 649 // generics support 650 Symbol* generic_signature() const { return _generic_signature; } 651 void set_generic_signature(Symbol* sig) { _generic_signature = sig; } 652 653 u2 enclosing_method_data(int offset); 654 u2 enclosing_method_class_index() { 655 return enclosing_method_data(enclosing_method_class_index_offset); 656 } 657 u2 enclosing_method_method_index() { 658 return enclosing_method_data(enclosing_method_method_index_offset); 659 } 660 void set_enclosing_method_indices(u2 class_index, 661 u2 method_index); 662 663 // jmethodID support 664 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, 665 methodHandle method_h); 666 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h, 667 size_t idnum, jmethodID new_id, jmethodID* new_jmeths, 668 jmethodID* to_dealloc_id_p, 669 jmethodID** to_dealloc_jmeths_p); 670 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 671 size_t *length_p, jmethodID* id_p); 672 jmethodID jmethod_id_or_null(Method* method); 673 674 // cached itable index support 675 void set_cached_itable_index(size_t idnum, int index); 676 int cached_itable_index(size_t idnum); 677 678 // annotations support 679 Annotations* annotations() const { return _annotations; } 680 void set_annotations(Annotations* anno) { _annotations = anno; } 681 AnnotationArray* class_annotations() const { 682 if (annotations() == NULL) return NULL; 683 return annotations()->class_annotations(); 684 } 685 Array<AnnotationArray*>* fields_annotations() const { 686 if (annotations() == NULL) return NULL; 687 return annotations()->fields_annotations(); 688 } 689 Annotations* type_annotations() const { 690 if (annotations() == NULL) return NULL; 691 return annotations()->type_annotations(); 692 } 693 694 // allocation 695 instanceOop allocate_instance(TRAPS); 696 697 // additional member function to return a handle 698 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } 699 700 objArrayOop allocate_objArray(int n, int length, TRAPS); 701 // Helper function 702 static instanceOop register_finalizer(instanceOop i, TRAPS); 703 704 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 705 // if not, throw either an Error or an Exception. 706 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 707 708 // initialization 709 void call_class_initializer(TRAPS); 710 void set_initialization_state_and_notify(ClassState state, TRAPS); 711 712 // OopMapCache support 713 OopMapCache* oop_map_cache() { return _oop_map_cache; } 714 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 715 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry); 716 717 // JNI identifier support (for static fields - for jni performance) 718 JNIid* jni_ids() { return _jni_ids; } 719 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 720 JNIid* jni_id_for(int offset); 721 722 // maintenance of deoptimization dependencies 723 int mark_dependent_nmethods(DepChange& changes); 724 void add_dependent_nmethod(nmethod* nm); 725 void remove_dependent_nmethod(nmethod* nm); 726 727 // On-stack replacement support 728 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 729 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 730 void add_osr_nmethod(nmethod* n); 731 void remove_osr_nmethod(nmethod* n); 732 nmethod* lookup_osr_nmethod(Method* const m, int bci, int level, bool match_level) const; 733 734 // Breakpoint support (see methods on Method* for details) 735 BreakpointInfo* breakpoints() const { return _breakpoints; }; 736 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 737 738 // support for stub routines 739 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 740 TRACE_DEFINE_OFFSET; 741 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 742 743 // subclass/subinterface checks 744 bool implements_interface(Klass* k) const; 745 746 // Access to the implementor of an interface. 747 Klass* implementor() const 748 { 749 Klass** k = adr_implementor(); 750 if (k == NULL) { 751 return NULL; 752 } else { 753 return *k; 754 } 755 } 756 757 void set_implementor(Klass* k) { 758 assert(is_interface(), "not interface"); 759 Klass** addr = adr_implementor(); 760 *addr = k; 761 } 762 763 int nof_implementors() const { 764 Klass* k = implementor(); 765 if (k == NULL) { 766 return 0; 767 } else if (k != this) { 768 return 1; 769 } else { 770 return 2; 771 } 772 } 773 774 void add_implementor(Klass* k); // k is a new class that implements this interface 775 void init_implementor(); // initialize 776 777 // link this class into the implementors list of every interface it implements 778 void process_interfaces(Thread *thread); 779 780 // virtual operations from Klass 781 bool is_leaf_class() const { return _subklass == NULL; } 782 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); 783 bool compute_is_subtype_of(Klass* k); 784 bool can_be_primary_super_slow() const; 785 int oop_size(oop obj) const { return size_helper(); } 786 bool oop_is_instance_slow() const { return true; } 787 788 // Iterators 789 void do_local_static_fields(FieldClosure* cl); 790 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 791 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS); 792 793 void methods_do(void f(Method* method)); 794 void array_klasses_do(void f(Klass* k)); 795 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 796 void with_array_klasses_do(void f(Klass* k)); 797 bool super_types_do(SuperTypeClosure* blk); 798 799 // Casting from Klass* 800 static InstanceKlass* cast(Klass* k) { 801 assert(k->is_klass(), "must be"); 802 assert(k->oop_is_instance(), "cast to InstanceKlass"); 803 return (InstanceKlass*) k; 804 } 805 806 InstanceKlass* java_super() const { 807 return (super() == NULL) ? NULL : cast(super()); 808 } 809 810 // Sizing (in words) 811 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); } 812 static int size(int vtable_length, int itable_length, 813 int nonstatic_oop_map_size, 814 bool is_interface, bool is_anonymous) { 815 return align_object_size(header_size() + 816 align_object_offset(vtable_length) + 817 align_object_offset(itable_length) + 818 ((is_interface || is_anonymous) ? 819 align_object_offset(nonstatic_oop_map_size) : 820 nonstatic_oop_map_size) + 821 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) + 822 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0)); 823 } 824 int size() const { return size(vtable_length(), 825 itable_length(), 826 nonstatic_oop_map_size(), 827 is_interface(), 828 is_anonymous()); 829 } 830 831 static int vtable_start_offset() { return header_size(); } 832 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; } 833 834 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); } 835 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); } 836 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 837 838 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 839 840 address static_field_addr(int offset); 841 842 OopMapBlock* start_of_nonstatic_oop_maps() const { 843 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length())); 844 } 845 846 Klass** adr_implementor() const { 847 if (is_interface()) { 848 return (Klass**)(start_of_nonstatic_oop_maps() + 849 nonstatic_oop_map_count()); 850 } else { 851 return NULL; 852 } 853 }; 854 855 Klass** adr_host_klass() const { 856 if (is_anonymous()) { 857 Klass** adr_impl = adr_implementor(); 858 if (adr_impl != NULL) { 859 return adr_impl + 1; 860 } else { 861 return (Klass**)(start_of_nonstatic_oop_maps() + 862 nonstatic_oop_map_count()); 863 } 864 } else { 865 return NULL; 866 } 867 } 868 869 // Allocation profiling support 870 juint alloc_size() const { return _alloc_count * size_helper(); } 871 void set_alloc_size(juint n) {} 872 873 // Use this to return the size of an instance in heap words: 874 int size_helper() const { 875 return layout_helper_to_size_helper(layout_helper()); 876 } 877 878 // This bit is initialized in classFileParser.cpp. 879 // It is false under any of the following conditions: 880 // - the class is abstract (including any interface) 881 // - the class has a finalizer (if !RegisterFinalizersAtInit) 882 // - the class size is larger than FastAllocateSizeLimit 883 // - the class is java/lang/Class, which cannot be allocated directly 884 bool can_be_fastpath_allocated() const { 885 return !layout_helper_needs_slow_path(layout_helper()); 886 } 887 888 // Java vtable/itable 889 klassVtable* vtable() const; // return new klassVtable wrapper 890 inline Method* method_at_vtable(int index); 891 klassItable* itable() const; // return new klassItable wrapper 892 Method* method_at_itable(Klass* holder, int index, TRAPS); 893 894 // Garbage collection 895 virtual void oops_do(OopClosure* cl); 896 897 void oop_follow_contents(oop obj); 898 int oop_adjust_pointers(oop obj); 899 900 void clean_implementors_list(BoolObjectClosure* is_alive); 901 void clean_method_data(BoolObjectClosure* is_alive); 902 903 // Explicit metaspace deallocation of fields 904 // For RedefineClasses, we need to deallocate instanceKlasses 905 void deallocate_contents(ClassLoaderData* loader_data); 906 907 // The constant pool is on stack if any of the methods are executing or 908 // referenced by handles. 909 bool on_stack() const { return _constants->on_stack(); } 910 911 void release_C_heap_structures(); 912 913 // Parallel Scavenge and Parallel Old 914 PARALLEL_GC_DECLS 915 916 // Naming 917 const char* signature_name() const; 918 919 // Iterators 920 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) { 921 return oop_oop_iterate_v(obj, blk); 922 } 923 924 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) { 925 return oop_oop_iterate_v_m(obj, blk, mr); 926 } 927 928#define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ 929 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ 930 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \ 931 MemRegion mr); 932 933 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL) 934 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL) 935 936#ifndef SERIALGC 937#define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ 938 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); 939 940 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 941 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 942#endif // !SERIALGC 943 944 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 945private: 946 // initialization state 947#ifdef ASSERT 948 void set_init_state(ClassState state); 949#else 950 void set_init_state(ClassState state) { _init_state = (u1)state; } 951#endif 952 void set_rewritten() { _misc_flags |= _misc_rewritten; } 953 void set_init_thread(Thread *thread) { _init_thread = thread; } 954 955 // The RedefineClasses() API can cause new method idnums to be needed 956 // which will cause the caches to grow. Safety requires different 957 // cache management logic if the caches can grow instead of just 958 // going from NULL to non-NULL. 959 bool idnum_can_increment() const { return has_been_redefined(); } 960 jmethodID* methods_jmethod_ids_acquire() const 961 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); } 962 void release_set_methods_jmethod_ids(jmethodID* jmeths) 963 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); } 964 965 int* methods_cached_itable_indices_acquire() const 966 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); } 967 void release_set_methods_cached_itable_indices(int* indices) 968 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); } 969 970 // Lock during initialization 971 volatile oop init_lock() const; 972 void set_init_lock(oop value) { klass_oop_store(&_init_lock, value); } 973 void fence_and_clear_init_lock(); // after fully_initialized 974 975 // Offsets for memory management 976 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;} 977 oop* adr_signers() const { return (oop*)&this->_signers;} 978 oop* adr_init_lock() const { return (oop*)&this->_init_lock;} 979 980 // Static methods that are used to implement member methods where an exposed this pointer 981 // is needed due to possible GCs 982 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); 983 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); 984 static void initialize_impl (instanceKlassHandle this_oop, TRAPS); 985 static void eager_initialize_impl (instanceKlassHandle this_oop); 986 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS); 987 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS); 988 static Klass* array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS); 989 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS); 990 /* jni_id_for_impl for jfieldID only */ 991 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset); 992 993 // Returns the array class for the n'th dimension 994 Klass* array_klass_impl(bool or_null, int n, TRAPS); 995 996 // Returns the array class with this class as element type 997 Klass* array_klass_impl(bool or_null, TRAPS); 998 999public: 1000 // CDS support - remove and restore oops from metadata. Oops are not shared. 1001 virtual void remove_unshareable_info(); 1002 virtual void restore_unshareable_info(TRAPS); 1003 1004 // jvm support 1005 jint compute_modifier_flags(TRAPS) const; 1006 1007public: 1008 // JVMTI support 1009 jint jvmti_class_status() const; 1010 1011 public: 1012 // Printing 1013#ifndef PRODUCT 1014 void print_on(outputStream* st) const; 1015#endif 1016 void print_value_on(outputStream* st) const; 1017 1018 void oop_print_value_on(oop obj, outputStream* st); 1019 1020#ifndef PRODUCT 1021 void oop_print_on (oop obj, outputStream* st); 1022 1023 void print_dependent_nmethods(bool verbose = false); 1024 bool is_dependent_nmethod(nmethod* nm); 1025#endif 1026 1027 const char* internal_name() const; 1028 1029 // Verification 1030 void verify_on(outputStream* st); 1031 1032 void oop_verify_on(oop obj, outputStream* st); 1033}; 1034 1035inline Method* InstanceKlass::method_at_vtable(int index) { 1036#ifndef PRODUCT 1037 assert(index >= 0, "valid vtable index"); 1038 if (DebugVtables) { 1039 verify_vtable_index(index); 1040 } 1041#endif 1042 vtableEntry* ve = (vtableEntry*)start_of_vtable(); 1043 return ve[index].method(); 1044} 1045 1046// for adding methods 1047// UNSET_IDNUM return means no more ids available 1048inline u2 InstanceKlass::next_method_idnum() { 1049 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1050 return ConstMethod::UNSET_IDNUM; // no more ids available 1051 } else { 1052 return _idnum_allocated_count++; 1053 } 1054} 1055 1056 1057/* JNIid class for jfieldIDs only */ 1058class JNIid: public CHeapObj<mtClass> { 1059 friend class VMStructs; 1060 private: 1061 Klass* _holder; 1062 JNIid* _next; 1063 int _offset; 1064#ifdef ASSERT 1065 bool _is_static_field_id; 1066#endif 1067 1068 public: 1069 // Accessors 1070 Klass* holder() const { return _holder; } 1071 int offset() const { return _offset; } 1072 JNIid* next() { return _next; } 1073 // Constructor 1074 JNIid(Klass* holder, int offset, JNIid* next); 1075 // Identifier lookup 1076 JNIid* find(int offset); 1077 1078 bool find_local_field(fieldDescriptor* fd) { 1079 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1080 } 1081 1082 static void deallocate(JNIid* id); 1083 // Debugging 1084#ifdef ASSERT 1085 bool is_static_field_id() const { return _is_static_field_id; } 1086 void set_is_static_field_id() { _is_static_field_id = true; } 1087#endif 1088 void verify(Klass* holder); 1089}; 1090 1091 1092// If breakpoints are more numerous than just JVMTI breakpoints, 1093// consider compressing this data structure. 1094// It is currently a simple linked list defined in method.hpp. 1095 1096class BreakpointInfo; 1097 1098 1099// A collection point for interesting information about the previous 1100// version(s) of an InstanceKlass. This class uses weak references to 1101// the information so that the information may be collected as needed 1102// by the system. If the information is shared, then a regular 1103// reference must be used because a weak reference would be seen as 1104// collectible. A GrowableArray of PreviousVersionNodes is attached 1105// to the InstanceKlass as needed. See PreviousVersionWalker below. 1106class PreviousVersionNode : public CHeapObj<mtClass> { 1107 private: 1108 // A shared ConstantPool is never collected so we'll always have 1109 // a reference to it so we can update items in the cache. We'll 1110 // have a weak reference to a non-shared ConstantPool until all 1111 // of the methods (EMCP or obsolete) have been collected; the 1112 // non-shared ConstantPool becomes collectible at that point. 1113 ConstantPool* _prev_constant_pool; // regular or weak reference 1114 bool _prev_cp_is_weak; // true if not a shared ConstantPool 1115 1116 // If the previous version of the InstanceKlass doesn't have any 1117 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the 1118 // EMCP methods have been collected, then _prev_EMCP_methods can 1119 // have a length of zero. 1120 GrowableArray<Method*>* _prev_EMCP_methods; 1121 1122public: 1123 PreviousVersionNode(ConstantPool* prev_constant_pool, bool prev_cp_is_weak, 1124 GrowableArray<Method*>* prev_EMCP_methods); 1125 ~PreviousVersionNode(); 1126 ConstantPool* prev_constant_pool() const { 1127 return _prev_constant_pool; 1128 } 1129 GrowableArray<Method*>* prev_EMCP_methods() const { 1130 return _prev_EMCP_methods; 1131 } 1132}; 1133 1134 1135// A Handle-ized version of PreviousVersionNode. 1136class PreviousVersionInfo : public ResourceObj { 1137 private: 1138 constantPoolHandle _prev_constant_pool_handle; 1139 // If the previous version of the InstanceKlass doesn't have any 1140 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the 1141 // methods cannot be collected while we hold a handle, 1142 // _prev_EMCP_methods should never have a length of zero. 1143 GrowableArray<methodHandle>* _prev_EMCP_method_handles; 1144 1145public: 1146 PreviousVersionInfo(PreviousVersionNode *pv_node); 1147 ~PreviousVersionInfo(); 1148 constantPoolHandle prev_constant_pool_handle() const { 1149 return _prev_constant_pool_handle; 1150 } 1151 GrowableArray<methodHandle>* prev_EMCP_method_handles() const { 1152 return _prev_EMCP_method_handles; 1153 } 1154}; 1155 1156 1157// Helper object for walking previous versions. This helper cleans up 1158// the Handles that it allocates when the helper object is destroyed. 1159// The PreviousVersionInfo object returned by next_previous_version() 1160// is only valid until a subsequent call to next_previous_version() or 1161// the helper object is destroyed. 1162class PreviousVersionWalker : public StackObj { 1163 private: 1164 GrowableArray<PreviousVersionNode *>* _previous_versions; 1165 int _current_index; 1166 // Fields for cleaning up when we are done walking the previous versions: 1167 // A HandleMark for the PreviousVersionInfo handles: 1168 HandleMark _hm; 1169 1170 // It would be nice to have a ResourceMark field in this helper also, 1171 // but the ResourceMark code says to be careful to delete handles held 1172 // in GrowableArrays _before_ deleting the GrowableArray. Since we 1173 // can't guarantee the order in which the fields are destroyed, we 1174 // have to let the creator of the PreviousVersionWalker object do 1175 // the right thing. Also, adding a ResourceMark here causes an 1176 // include loop. 1177 1178 // A pointer to the current info object so we can handle the deletes. 1179 PreviousVersionInfo * _current_p; 1180 1181 public: 1182 PreviousVersionWalker(InstanceKlass *ik); 1183 ~PreviousVersionWalker(); 1184 1185 // Return the interesting information for the next previous version 1186 // of the klass. Returns NULL if there are no more previous versions. 1187 PreviousVersionInfo* next_previous_version(); 1188}; 1189 1190 1191// 1192// nmethodBucket is used to record dependent nmethods for 1193// deoptimization. nmethod dependencies are actually <klass, method> 1194// pairs but we really only care about the klass part for purposes of 1195// finding nmethods which might need to be deoptimized. Instead of 1196// recording the method, a count of how many times a particular nmethod 1197// was recorded is kept. This ensures that any recording errors are 1198// noticed since an nmethod should be removed as many times are it's 1199// added. 1200// 1201class nmethodBucket: public CHeapObj<mtClass> { 1202 friend class VMStructs; 1203 private: 1204 nmethod* _nmethod; 1205 int _count; 1206 nmethodBucket* _next; 1207 1208 public: 1209 nmethodBucket(nmethod* nmethod, nmethodBucket* next) { 1210 _nmethod = nmethod; 1211 _next = next; 1212 _count = 1; 1213 } 1214 int count() { return _count; } 1215 int increment() { _count += 1; return _count; } 1216 int decrement() { _count -= 1; assert(_count >= 0, "don't underflow"); return _count; } 1217 nmethodBucket* next() { return _next; } 1218 void set_next(nmethodBucket* b) { _next = b; } 1219 nmethod* get_nmethod() { return _nmethod; } 1220}; 1221 1222// An iterator that's used to access the inner classes indices in the 1223// InstanceKlass::_inner_classes array. 1224class InnerClassesIterator : public StackObj { 1225 private: 1226 Array<jushort>* _inner_classes; 1227 int _length; 1228 int _idx; 1229 public: 1230 1231 InnerClassesIterator(instanceKlassHandle k) { 1232 _inner_classes = k->inner_classes(); 1233 if (k->inner_classes() != NULL) { 1234 _length = _inner_classes->length(); 1235 // The inner class array's length should be the multiple of 1236 // inner_class_next_offset if it only contains the InnerClasses 1237 // attribute data, or it should be 1238 // n*inner_class_next_offset+enclosing_method_attribute_size 1239 // if it also contains the EnclosingMethod data. 1240 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1241 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1242 "just checking"); 1243 // Remove the enclosing_method portion if exists. 1244 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1245 _length -= InstanceKlass::enclosing_method_attribute_size; 1246 } 1247 } else { 1248 _length = 0; 1249 } 1250 _idx = 0; 1251 } 1252 1253 int length() const { 1254 return _length; 1255 } 1256 1257 void next() { 1258 _idx += InstanceKlass::inner_class_next_offset; 1259 } 1260 1261 bool done() const { 1262 return (_idx >= _length); 1263 } 1264 1265 u2 inner_class_info_index() const { 1266 return _inner_classes->at( 1267 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1268 } 1269 1270 void set_inner_class_info_index(u2 index) { 1271 _inner_classes->at_put( 1272 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1273 } 1274 1275 u2 outer_class_info_index() const { 1276 return _inner_classes->at( 1277 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1278 } 1279 1280 void set_outer_class_info_index(u2 index) { 1281 _inner_classes->at_put( 1282 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1283 } 1284 1285 u2 inner_name_index() const { 1286 return _inner_classes->at( 1287 _idx + InstanceKlass::inner_class_inner_name_offset); 1288 } 1289 1290 void set_inner_name_index(u2 index) { 1291 _inner_classes->at_put( 1292 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1293 } 1294 1295 u2 inner_access_flags() const { 1296 return _inner_classes->at( 1297 _idx + InstanceKlass::inner_class_access_flags_offset); 1298 } 1299}; 1300 1301#endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP 1302