instanceKlass.hpp revision 113:ba764ed4b6f2
1/* 2 * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25// An instanceKlass is the VM level representation of a Java class. 26// It contains all information needed for at class at execution runtime. 27 28// instanceKlass layout: 29// [header ] klassOop 30// [klass pointer ] klassOop 31// [C++ vtbl pointer ] Klass 32// [subtype cache ] Klass 33// [instance size ] Klass 34// [java mirror ] Klass 35// [super ] Klass 36// [access_flags ] Klass 37// [name ] Klass 38// [first subklass ] Klass 39// [next sibling ] Klass 40// [array klasses ] 41// [methods ] 42// [local interfaces ] 43// [transitive interfaces ] 44// [number of implementors ] 45// [implementors ] klassOop[2] 46// [fields ] 47// [constants ] 48// [class loader ] 49// [protection domain ] 50// [signers ] 51// [source file name ] 52// [inner classes ] 53// [static field size ] 54// [nonstatic field size ] 55// [static oop fields size ] 56// [nonstatic oop maps size ] 57// [has finalize method ] 58// [deoptimization mark bit ] 59// [initialization state ] 60// [initializing thread ] 61// [Java vtable length ] 62// [oop map cache (stack maps) ] 63// [EMBEDDED Java vtable ] size in words = vtable_len 64// [EMBEDDED static oop fields ] size in words = static_oop_fields_size 65// [ static non-oop fields ] size in words = static_field_size - static_oop_fields_size 66// [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size 67// 68// The embedded nonstatic oop-map blocks are short pairs (offset, length) indicating 69// where oops are located in instances of this klass. 70 71 72// forward declaration for class -- see below for definition 73class SuperTypeClosure; 74class OopMapBlock; 75class JNIid; 76class jniIdMapBase; 77class BreakpointInfo; 78class fieldDescriptor; 79class DepChange; 80class nmethodBucket; 81class PreviousVersionNode; 82class JvmtiCachedClassFieldMap; 83 84// This is used in iterators below. 85class FieldClosure: public StackObj { 86public: 87 virtual void do_field(fieldDescriptor* fd) = 0; 88}; 89 90#ifndef PRODUCT 91// Print fields. 92// If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. 93class FieldPrinter: public FieldClosure { 94 oop _obj; 95 outputStream* _st; 96 public: 97 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} 98 void do_field(fieldDescriptor* fd); 99}; 100#endif // !PRODUCT 101 102class instanceKlass: public Klass { 103 friend class VMStructs; 104 public: 105 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 106 // of the class loading & initialization procedure, and the use of the states. 107 enum ClassState { 108 unparsable_by_gc = 0, // object is not yet parsable by gc. Value of _init_state at object allocation. 109 allocated, // allocated (but not yet linked) 110 loaded, // loaded and inserted in class hierarchy (but not linked yet) 111 linked, // successfully linked/verified (but not initialized yet) 112 being_initialized, // currently running class initializer 113 fully_initialized, // initialized (successfull final state) 114 initialization_error // error happened during initialization 115 }; 116 117 public: 118 oop* oop_block_beg() const { return adr_array_klasses(); } 119 oop* oop_block_end() const { return adr_methods_default_annotations() + 1; } 120 121 enum { 122 implementors_limit = 2 // how many implems can we track? 123 }; 124 125 protected: 126 // 127 // The oop block. See comment in klass.hpp before making changes. 128 // 129 130 // Array classes holding elements of this class. 131 klassOop _array_klasses; 132 // Method array. 133 objArrayOop _methods; 134 // Int array containing the original order of method in the class file (for 135 // JVMTI). 136 typeArrayOop _method_ordering; 137 // Interface (klassOops) this class declares locally to implement. 138 objArrayOop _local_interfaces; 139 // Interface (klassOops) this class implements transitively. 140 objArrayOop _transitive_interfaces; 141 // Instance and static variable information, 5-tuples of shorts [access, name 142 // index, sig index, initval index, offset]. 143 typeArrayOop _fields; 144 // Constant pool for this class. 145 constantPoolOop _constants; 146 // Class loader used to load this class, NULL if VM loader used. 147 oop _class_loader; 148 // Protection domain. 149 oop _protection_domain; 150 // Class signers. 151 objArrayOop _signers; 152 // Name of source file containing this klass, NULL if not specified. 153 symbolOop _source_file_name; 154 // the source debug extension for this klass, NULL if not specified. 155 symbolOop _source_debug_extension; 156 // inner_classes attribute. 157 typeArrayOop _inner_classes; 158 // Implementors of this interface (not valid if it overflows) 159 klassOop _implementors[implementors_limit]; 160 // Generic signature, or null if none. 161 symbolOop _generic_signature; 162 // Annotations for this class, or null if none. 163 typeArrayOop _class_annotations; 164 // Annotation objects (byte arrays) for fields, or null if no annotations. 165 // Indices correspond to entries (not indices) in fields array. 166 objArrayOop _fields_annotations; 167 // Annotation objects (byte arrays) for methods, or null if no annotations. 168 // Index is the idnum, which is initially the same as the methods array index. 169 objArrayOop _methods_annotations; 170 // Annotation objects (byte arrays) for methods' parameters, or null if no 171 // such annotations. 172 // Index is the idnum, which is initially the same as the methods array index. 173 objArrayOop _methods_parameter_annotations; 174 // Annotation objects (byte arrays) for methods' default values, or null if no 175 // such annotations. 176 // Index is the idnum, which is initially the same as the methods array index. 177 objArrayOop _methods_default_annotations; 178 179 // 180 // End of the oop block. 181 // 182 183 // number of words used by non-static fields in this klass (including 184 // inherited fields but after header_size()). If fields are compressed into 185 // header, this can be zero so it's not the same as number of static fields. 186 int _nonstatic_field_size; 187 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 188 int _static_oop_field_size;// number of static oop fields in this klass 189 int _nonstatic_oop_map_size;// number of nonstatic oop-map blocks allocated at end of this klass 190 bool _is_marked_dependent; // used for marking during flushing and deoptimization 191 bool _rewritten; // methods rewritten. 192 bool _has_nonstatic_fields; // for sizing with UseCompressedOops 193 u2 _minor_version; // minor version number of class file 194 u2 _major_version; // major version number of class file 195 ClassState _init_state; // state of class 196 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) 197 int _vtable_len; // length of Java vtable (in words) 198 int _itable_len; // length of Java itable (in words) 199 ReferenceType _reference_type; // reference type 200 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 201 JNIid* _jni_ids; // First JNI identifier for static fields in this class 202 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 203 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL 204 nmethodBucket* _dependencies; // list of dependent nmethods 205 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 206 BreakpointInfo* _breakpoints; // bpt lists, managed by methodOop 207 int _nof_implementors; // No of implementors of this interface (zero if not an interface) 208 // Array of interesting part(s) of the previous version(s) of this 209 // instanceKlass. See PreviousVersionWalker below. 210 GrowableArray<PreviousVersionNode *>* _previous_versions; 211 u2 _enclosing_method_class_index; // Constant pool index for class of enclosing method, or 0 if none 212 u2 _enclosing_method_method_index; // Constant pool index for name and type of enclosing method, or 0 if none 213 // JVMTI fields can be moved to their own structure - see 6315920 214 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH 215 jint _cached_class_file_len; // JVMTI: length of above 216 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 217 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 218 219 // embedded Java vtable follows here 220 // embedded Java itables follows here 221 // embedded static fields follows here 222 // embedded nonstatic oop-map blocks follows here 223 224 friend class instanceKlassKlass; 225 friend class SystemDictionary; 226 227 public: 228 bool has_nonstatic_fields() const { return _has_nonstatic_fields; } 229 void set_has_nonstatic_fields(bool b) { _has_nonstatic_fields = b; } 230 231 // field sizes 232 int nonstatic_field_size() const { return _nonstatic_field_size; } 233 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 234 235 int static_field_size() const { return _static_field_size; } 236 void set_static_field_size(int size) { _static_field_size = size; } 237 238 int static_oop_field_size() const { return _static_oop_field_size; } 239 void set_static_oop_field_size(int size) { _static_oop_field_size = size; } 240 241 // Java vtable 242 int vtable_length() const { return _vtable_len; } 243 void set_vtable_length(int len) { _vtable_len = len; } 244 245 // Java itable 246 int itable_length() const { return _itable_len; } 247 void set_itable_length(int len) { _itable_len = len; } 248 249 // array klasses 250 klassOop array_klasses() const { return _array_klasses; } 251 void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); } 252 253 // methods 254 objArrayOop methods() const { return _methods; } 255 void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); } 256 methodOop method_with_idnum(int idnum); 257 258 // method ordering 259 typeArrayOop method_ordering() const { return _method_ordering; } 260 void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); } 261 262 // interfaces 263 objArrayOop local_interfaces() const { return _local_interfaces; } 264 void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); } 265 objArrayOop transitive_interfaces() const { return _transitive_interfaces; } 266 void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); } 267 268 // fields 269 // Field info extracted from the class file and stored 270 // as an array of 7 shorts 271 enum FieldOffset { 272 access_flags_offset = 0, 273 name_index_offset = 1, 274 signature_index_offset = 2, 275 initval_index_offset = 3, 276 low_offset = 4, 277 high_offset = 5, 278 generic_signature_offset = 6, 279 next_offset = 7 280 }; 281 282 typeArrayOop fields() const { return _fields; } 283 int offset_from_fields( int index ) const { 284 return build_int_from_shorts( fields()->ushort_at(index + low_offset), 285 fields()->ushort_at(index + high_offset) ); 286 } 287 288 void set_fields(typeArrayOop f) { oop_store_without_check((oop*) &_fields, (oop) f); } 289 290 // inner classes 291 typeArrayOop inner_classes() const { return _inner_classes; } 292 void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) f); } 293 294 enum InnerClassAttributeOffset { 295 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 296 inner_class_inner_class_info_offset = 0, 297 inner_class_outer_class_info_offset = 1, 298 inner_class_inner_name_offset = 2, 299 inner_class_access_flags_offset = 3, 300 inner_class_next_offset = 4 301 }; 302 303 // package 304 bool is_same_class_package(klassOop class2); 305 bool is_same_class_package(oop classloader2, symbolOop classname2); 306 static bool is_same_class_package(oop class_loader1, symbolOop class_name1, oop class_loader2, symbolOop class_name2); 307 308 // initialization state 309 bool is_loaded() const { return _init_state >= loaded; } 310 bool is_linked() const { return _init_state >= linked; } 311 bool is_initialized() const { return _init_state == fully_initialized; } 312 bool is_not_initialized() const { return _init_state < being_initialized; } 313 bool is_being_initialized() const { return _init_state == being_initialized; } 314 bool is_in_error_state() const { return _init_state == initialization_error; } 315 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 316 int get_init_state() { return _init_state; } // Useful for debugging 317 bool is_rewritten() const { return _rewritten; } 318 319 // marking 320 bool is_marked_dependent() const { return _is_marked_dependent; } 321 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 322 323 // initialization (virtuals from Klass) 324 bool should_be_initialized() const; // means that initialize should be called 325 void initialize(TRAPS); 326 void link_class(TRAPS); 327 bool link_class_or_fail(TRAPS); // returns false on failure 328 void unlink_class(); 329 void rewrite_class(TRAPS); 330 methodOop class_initializer(); 331 332 // set the class to initialized if no static initializer is present 333 void eager_initialize(Thread *thread); 334 335 // reference type 336 ReferenceType reference_type() const { return _reference_type; } 337 void set_reference_type(ReferenceType t) { _reference_type = t; } 338 339 // find local field, returns true if found 340 bool find_local_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const; 341 // find field in direct superinterfaces, returns the interface in which the field is defined 342 klassOop find_interface_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const; 343 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 344 klassOop find_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const; 345 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 346 klassOop find_field(symbolOop name, symbolOop sig, bool is_static, fieldDescriptor* fd) const; 347 348 // find a non-static or static field given its offset within the class. 349 bool contains_field_offset(int offset) { 350 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); 351 } 352 353 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 354 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 355 356 // find a local method (returns NULL if not found) 357 methodOop find_method(symbolOop name, symbolOop signature) const; 358 static methodOop find_method(objArrayOop methods, symbolOop name, symbolOop signature); 359 360 // lookup operation (returns NULL if not found) 361 methodOop uncached_lookup_method(symbolOop name, symbolOop signature) const; 362 363 // lookup a method in all the interfaces that this class implements 364 // (returns NULL if not found) 365 methodOop lookup_method_in_all_interfaces(symbolOop name, symbolOop signature) const; 366 367 // constant pool 368 constantPoolOop constants() const { return _constants; } 369 void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); } 370 371 // class loader 372 oop class_loader() const { return _class_loader; } 373 void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); } 374 375 // protection domain 376 oop protection_domain() { return _protection_domain; } 377 void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); } 378 379 // signers 380 objArrayOop signers() const { return _signers; } 381 void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); } 382 383 // source file name 384 symbolOop source_file_name() const { return _source_file_name; } 385 void set_source_file_name(symbolOop n) { oop_store_without_check((oop*) &_source_file_name, (oop) n); } 386 387 // minor and major version numbers of class file 388 u2 minor_version() const { return _minor_version; } 389 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 390 u2 major_version() const { return _major_version; } 391 void set_major_version(u2 major_version) { _major_version = major_version; } 392 393 // source debug extension 394 symbolOop source_debug_extension() const { return _source_debug_extension; } 395 void set_source_debug_extension(symbolOop n){ oop_store_without_check((oop*) &_source_debug_extension, (oop) n); } 396 397 // nonstatic oop-map blocks 398 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 399 void set_nonstatic_oop_map_size(int size) { _nonstatic_oop_map_size = size; } 400 401 // RedefineClasses() support for previous versions: 402 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods, 403 int emcp_method_count); 404 bool has_previous_version() const; 405 void init_previous_versions() { 406 _previous_versions = NULL; 407 } 408 GrowableArray<PreviousVersionNode *>* previous_versions() const { 409 return _previous_versions; 410 } 411 412 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 413 void set_cached_class_file(unsigned char *class_file_bytes, 414 jint class_file_len) { _cached_class_file_len = class_file_len; 415 _cached_class_file_bytes = class_file_bytes; } 416 jint get_cached_class_file_len() { return _cached_class_file_len; } 417 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; } 418 419 // JVMTI: Support for caching of field indices, types, and offsets 420 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 421 _jvmti_cached_class_field_map = descriptor; 422 } 423 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 424 return _jvmti_cached_class_field_map; 425 } 426 427 // for adding methods, constMethodOopDesc::UNSET_IDNUM means no more ids available 428 inline u2 next_method_idnum(); 429 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 430 431 // generics support 432 symbolOop generic_signature() const { return _generic_signature; } 433 void set_generic_signature(symbolOop sig) { oop_store_without_check((oop*)&_generic_signature, (oop)sig); } 434 u2 enclosing_method_class_index() const { return _enclosing_method_class_index; } 435 u2 enclosing_method_method_index() const { return _enclosing_method_method_index; } 436 void set_enclosing_method_indices(u2 class_index, 437 u2 method_index) { _enclosing_method_class_index = class_index; 438 _enclosing_method_method_index = method_index; } 439 440 // jmethodID support 441 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, size_t idnum, 442 jmethodID new_id, jmethodID* new_jmeths); 443 static jmethodID jmethod_id_for_impl(instanceKlassHandle ik_h, methodHandle method_h); 444 jmethodID jmethod_id_or_null(methodOop method); 445 446 // cached itable index support 447 void set_cached_itable_index(size_t idnum, int index); 448 int cached_itable_index(size_t idnum); 449 450 // annotations support 451 typeArrayOop class_annotations() const { return _class_annotations; } 452 objArrayOop fields_annotations() const { return _fields_annotations; } 453 objArrayOop methods_annotations() const { return _methods_annotations; } 454 objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; } 455 objArrayOop methods_default_annotations() const { return _methods_default_annotations; } 456 void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); } 457 void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); } 458 void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); } 459 void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); } 460 void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); } 461 typeArrayOop get_method_annotations_of(int idnum) 462 { return get_method_annotations_from(idnum, _methods_annotations); } 463 typeArrayOop get_method_parameter_annotations_of(int idnum) 464 { return get_method_annotations_from(idnum, _methods_parameter_annotations); } 465 typeArrayOop get_method_default_annotations_of(int idnum) 466 { return get_method_annotations_from(idnum, _methods_default_annotations); } 467 void set_method_annotations_of(int idnum, typeArrayOop anno) 468 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } 469 void set_method_parameter_annotations_of(int idnum, typeArrayOop anno) 470 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } 471 void set_method_default_annotations_of(int idnum, typeArrayOop anno) 472 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } 473 474 // allocation 475 DEFINE_ALLOCATE_PERMANENT(instanceKlass); 476 instanceOop allocate_instance(TRAPS); 477 instanceOop allocate_permanent_instance(TRAPS); 478 479 // additional member function to return a handle 480 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } 481 482 objArrayOop allocate_objArray(int n, int length, TRAPS); 483 // Helper function 484 static instanceOop register_finalizer(instanceOop i, TRAPS); 485 486 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 487 // if not, throw either an Error or an Exception. 488 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 489 490 // initialization 491 void call_class_initializer(TRAPS); 492 void set_initialization_state_and_notify(ClassState state, TRAPS); 493 494 // OopMapCache support 495 OopMapCache* oop_map_cache() { return _oop_map_cache; } 496 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 497 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry); 498 499 // JNI identifier support (for static fields - for jni performance) 500 JNIid* jni_ids() { return _jni_ids; } 501 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 502 JNIid* jni_id_for(int offset); 503 504 // maintenance of deoptimization dependencies 505 int mark_dependent_nmethods(DepChange& changes); 506 void add_dependent_nmethod(nmethod* nm); 507 void remove_dependent_nmethod(nmethod* nm); 508 509 // On-stack replacement support 510 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 511 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 512 void add_osr_nmethod(nmethod* n); 513 void remove_osr_nmethod(nmethod* n); 514 nmethod* lookup_osr_nmethod(const methodOop m, int bci) const; 515 516 // Breakpoint support (see methods on methodOop for details) 517 BreakpointInfo* breakpoints() const { return _breakpoints; }; 518 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 519 520 // support for stub routines 521 static int init_state_offset_in_bytes() { return offset_of(instanceKlass, _init_state); } 522 static int init_thread_offset_in_bytes() { return offset_of(instanceKlass, _init_thread); } 523 524 // subclass/subinterface checks 525 bool implements_interface(klassOop k) const; 526 527 // Access to implementors of an interface. We only store the count 528 // of implementors, and in case, there are only a few 529 // implementors, we store them in a short list. 530 // This accessor returns NULL if we walk off the end of the list. 531 klassOop implementor(int i) const { 532 return (i < implementors_limit)? _implementors[i]: (klassOop) NULL; 533 } 534 int nof_implementors() const { return _nof_implementors; } 535 void add_implementor(klassOop k); // k is a new class that implements this interface 536 void init_implementor(); // initialize 537 538 // link this class into the implementors list of every interface it implements 539 void process_interfaces(Thread *thread); 540 541 // virtual operations from Klass 542 bool is_leaf_class() const { return _subklass == NULL; } 543 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS); 544 bool compute_is_subtype_of(klassOop k); 545 bool can_be_primary_super_slow() const; 546 klassOop java_super() const { return super(); } 547 int oop_size(oop obj) const { return size_helper(); } 548 int klass_oop_size() const { return object_size(); } 549 bool oop_is_instance_slow() const { return true; } 550 551 // Iterators 552 void do_local_static_fields(FieldClosure* cl); 553 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 554 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS); 555 556 void methods_do(void f(methodOop method)); 557 void array_klasses_do(void f(klassOop k)); 558 void with_array_klasses_do(void f(klassOop k)); 559 bool super_types_do(SuperTypeClosure* blk); 560 561 // Casting from klassOop 562 static instanceKlass* cast(klassOop k) { 563 Klass* kp = k->klass_part(); 564 assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass"); 565 return (instanceKlass*) kp; 566 } 567 568 // Sizing (in words) 569 static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); } 570 int object_size() const { return object_size(align_object_offset(vtable_length()) + align_object_offset(itable_length()) + static_field_size() + nonstatic_oop_map_size()); } 571 static int vtable_start_offset() { return header_size(); } 572 static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; } 573 static int object_size(int extra) { return align_object_size(header_size() + extra); } 574 575 intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + vtable_start_offset(); } 576 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); } 577 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)as_klassOop(); } 578 579 // Static field offset is an offset into the Heap, should be converted by 580 // based on UseCompressedOop for traversal 581 HeapWord* start_of_static_fields() const { 582 return (HeapWord*)(start_of_itable() + align_object_offset(itable_length())); 583 } 584 585 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 586 587 int offset_of_static_fields() const { 588 return (intptr_t)start_of_static_fields() - (intptr_t)as_klassOop(); 589 } 590 591 OopMapBlock* start_of_nonstatic_oop_maps() const { 592 return (OopMapBlock*) (start_of_static_fields() + static_field_size()); 593 } 594 595 // Allocation profiling support 596 juint alloc_size() const { return _alloc_count * size_helper(); } 597 void set_alloc_size(juint n) {} 598 599 // Use this to return the size of an instance in heap words: 600 int size_helper() const { 601 return layout_helper_to_size_helper(layout_helper()); 602 } 603 604 // This bit is initialized in classFileParser.cpp. 605 // It is false under any of the following conditions: 606 // - the class is abstract (including any interface) 607 // - the class has a finalizer (if !RegisterFinalizersAtInit) 608 // - the class size is larger than FastAllocateSizeLimit 609 // - the class is java/lang/Class, which cannot be allocated directly 610 bool can_be_fastpath_allocated() const { 611 return !layout_helper_needs_slow_path(layout_helper()); 612 } 613 614 // Java vtable/itable 615 klassVtable* vtable() const; // return new klassVtable wrapper 616 inline methodOop method_at_vtable(int index); 617 klassItable* itable() const; // return new klassItable wrapper 618 methodOop method_at_itable(klassOop holder, int index, TRAPS); 619 620 // Garbage collection 621 void oop_follow_contents(oop obj); 622 void follow_static_fields(); 623 void adjust_static_fields(); 624 int oop_adjust_pointers(oop obj); 625 bool object_is_parsable() const { return _init_state != unparsable_by_gc; } 626 // Value of _init_state must be zero (unparsable_by_gc) when klass field is set. 627 628 void follow_weak_klass_links( 629 BoolObjectClosure* is_alive, OopClosure* keep_alive); 630 void release_C_heap_structures(); 631 632 // Parallel Scavenge and Parallel Old 633 PARALLEL_GC_DECLS 634 635#ifndef SERIALGC 636 // Parallel Scavenge 637 void copy_static_fields(PSPromotionManager* pm); 638 void push_static_fields(PSPromotionManager* pm); 639 640 // Parallel Old 641 void follow_static_fields(ParCompactionManager* cm); 642 void copy_static_fields(ParCompactionManager* cm); 643 void update_static_fields(); 644 void update_static_fields(HeapWord* beg_addr, HeapWord* end_addr); 645#endif // SERIALGC 646 647 // Naming 648 char* signature_name() const; 649 650 // Iterators 651 int oop_oop_iterate(oop obj, OopClosure* blk) { 652 return oop_oop_iterate_v(obj, blk); 653 } 654 655 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) { 656 return oop_oop_iterate_v_m(obj, blk, mr); 657 } 658 659#define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ 660 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ 661 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \ 662 MemRegion mr); 663 664 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL) 665 ALL_OOP_OOP_ITERATE_CLOSURES_3(InstanceKlass_OOP_OOP_ITERATE_DECL) 666 667 void iterate_static_fields(OopClosure* closure); 668 void iterate_static_fields(OopClosure* closure, MemRegion mr); 669 670private: 671 // initialization state 672#ifdef ASSERT 673 void set_init_state(ClassState state); 674#else 675 void set_init_state(ClassState state) { _init_state = state; } 676#endif 677 void set_rewritten() { _rewritten = true; } 678 void set_init_thread(Thread *thread) { _init_thread = thread; } 679 680 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 681 jmethodID* methods_jmethod_ids_acquire() const 682 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); } 683 void release_set_methods_jmethod_ids(jmethodID* jmeths) 684 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); } 685 686 int* methods_cached_itable_indices_acquire() const 687 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); } 688 void release_set_methods_cached_itable_indices(int* indices) 689 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); } 690 691 inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos); 692 void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); } 693 void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p); 694 695 // Offsets for memory management 696 oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;} 697 oop* adr_methods() const { return (oop*)&this->_methods;} 698 oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;} 699 oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;} 700 oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;} 701 oop* adr_fields() const { return (oop*)&this->_fields;} 702 oop* adr_constants() const { return (oop*)&this->_constants;} 703 oop* adr_class_loader() const { return (oop*)&this->_class_loader;} 704 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;} 705 oop* adr_signers() const { return (oop*)&this->_signers;} 706 oop* adr_source_file_name() const { return (oop*)&this->_source_file_name;} 707 oop* adr_source_debug_extension() const { return (oop*)&this->_source_debug_extension;} 708 oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;} 709 oop* adr_implementors() const { return (oop*)&this->_implementors[0];} 710 oop* adr_generic_signature() const { return (oop*)&this->_generic_signature;} 711 oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;} 712 oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;} 713 oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;} 714 oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;} 715 oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;} 716 oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;} 717 oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;} 718 719 // Static methods that are used to implement member methods where an exposed this pointer 720 // is needed due to possible GCs 721 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); 722 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); 723 static void initialize_impl (instanceKlassHandle this_oop, TRAPS); 724 static void eager_initialize_impl (instanceKlassHandle this_oop); 725 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS); 726 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS); 727 static klassOop array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS); 728 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS); 729 /* jni_id_for_impl for jfieldID only */ 730 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset); 731 732 // Returns the array class for the n'th dimension 733 klassOop array_klass_impl(bool or_null, int n, TRAPS); 734 735 // Returns the array class with this class as element type 736 klassOop array_klass_impl(bool or_null, TRAPS); 737 738public: 739 // sharing support 740 virtual void remove_unshareable_info(); 741 void field_names_and_sigs_iterate(OopClosure* closure); 742 743 // jvm support 744 jint compute_modifier_flags(TRAPS) const; 745 746public: 747 // JVMTI support 748 jint jvmti_class_status() const; 749 750#ifndef PRODUCT 751 public: 752 // Printing 753 void oop_print_on (oop obj, outputStream* st); 754 void oop_print_value_on(oop obj, outputStream* st); 755 756 void print_dependent_nmethods(bool verbose = false); 757 bool is_dependent_nmethod(nmethod* nm); 758#endif 759 760 public: 761 // Verification 762 const char* internal_name() const; 763 void oop_verify_on(oop obj, outputStream* st); 764 765#ifndef PRODUCT 766 static void verify_class_klass_nonstatic_oop_maps(klassOop k) PRODUCT_RETURN; 767#endif 768}; 769 770inline methodOop instanceKlass::method_at_vtable(int index) { 771#ifndef PRODUCT 772 assert(index >= 0, "valid vtable index"); 773 if (DebugVtables) { 774 verify_vtable_index(index); 775 } 776#endif 777 vtableEntry* ve = (vtableEntry*)start_of_vtable(); 778 return ve[index].method(); 779} 780 781inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) { 782 if (annos == NULL || annos->length() <= idnum) { 783 return NULL; 784 } 785 return typeArrayOop(annos->obj_at(idnum)); 786} 787 788// for adding methods 789// UNSET_IDNUM return means no more ids available 790inline u2 instanceKlass::next_method_idnum() { 791 if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) { 792 return constMethodOopDesc::UNSET_IDNUM; // no more ids available 793 } else { 794 return _idnum_allocated_count++; 795 } 796} 797 798 799// ValueObjs embedded in klass. Describes where oops are located in instances of this klass. 800 801class OopMapBlock VALUE_OBJ_CLASS_SPEC { 802 private: 803 jushort _offset; // Offset of first oop in oop-map block 804 jushort _length; // Length of oop-map block 805 public: 806 // Accessors 807 jushort offset() const { return _offset; } 808 void set_offset(jushort offset) { _offset = offset; } 809 810 jushort length() const { return _length; } 811 void set_length(jushort length) { _length = length; } 812}; 813 814/* JNIid class for jfieldIDs only */ 815class JNIid: public CHeapObj { 816 friend class VMStructs; 817 private: 818 klassOop _holder; 819 JNIid* _next; 820 int _offset; 821#ifdef ASSERT 822 bool _is_static_field_id; 823#endif 824 825 public: 826 // Accessors 827 klassOop holder() const { return _holder; } 828 int offset() const { return _offset; } 829 JNIid* next() { return _next; } 830 // Constructor 831 JNIid(klassOop holder, int offset, JNIid* next); 832 // Identifier lookup 833 JNIid* find(int offset); 834 835 // Garbage collection support 836 oop* holder_addr() { return (oop*)&_holder; } 837 void oops_do(OopClosure* f); 838 static void deallocate(JNIid* id); 839 // Debugging 840#ifdef ASSERT 841 bool is_static_field_id() const { return _is_static_field_id; } 842 void set_is_static_field_id() { _is_static_field_id = true; } 843#endif 844 void verify(klassOop holder); 845}; 846 847 848// If breakpoints are more numerous than just JVMTI breakpoints, 849// consider compressing this data structure. 850// It is currently a simple linked list defined in methodOop.hpp. 851 852class BreakpointInfo; 853 854 855// A collection point for interesting information about the previous 856// version(s) of an instanceKlass. This class uses weak references to 857// the information so that the information may be collected as needed 858// by the system. If the information is shared, then a regular 859// reference must be used because a weak reference would be seen as 860// collectible. A GrowableArray of PreviousVersionNodes is attached 861// to the instanceKlass as needed. See PreviousVersionWalker below. 862class PreviousVersionNode : public CHeapObj { 863 private: 864 // A shared ConstantPool is never collected so we'll always have 865 // a reference to it so we can update items in the cache. We'll 866 // have a weak reference to a non-shared ConstantPool until all 867 // of the methods (EMCP or obsolete) have been collected; the 868 // non-shared ConstantPool becomes collectible at that point. 869 jobject _prev_constant_pool; // regular or weak reference 870 bool _prev_cp_is_weak; // true if not a shared ConstantPool 871 872 // If the previous version of the instanceKlass doesn't have any 873 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the 874 // EMCP methods have been collected, then _prev_EMCP_methods can 875 // have a length of zero. 876 GrowableArray<jweak>* _prev_EMCP_methods; 877 878public: 879 PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak, 880 GrowableArray<jweak>* prev_EMCP_methods); 881 ~PreviousVersionNode(); 882 jobject prev_constant_pool() const { 883 return _prev_constant_pool; 884 } 885 GrowableArray<jweak>* prev_EMCP_methods() const { 886 return _prev_EMCP_methods; 887 } 888}; 889 890 891// A Handle-ized version of PreviousVersionNode. 892class PreviousVersionInfo : public ResourceObj { 893 private: 894 constantPoolHandle _prev_constant_pool_handle; 895 // If the previous version of the instanceKlass doesn't have any 896 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the 897 // methods cannot be collected while we hold a handle, 898 // _prev_EMCP_methods should never have a length of zero. 899 GrowableArray<methodHandle>* _prev_EMCP_method_handles; 900 901public: 902 PreviousVersionInfo(PreviousVersionNode *pv_node); 903 ~PreviousVersionInfo(); 904 constantPoolHandle prev_constant_pool_handle() const { 905 return _prev_constant_pool_handle; 906 } 907 GrowableArray<methodHandle>* prev_EMCP_method_handles() const { 908 return _prev_EMCP_method_handles; 909 } 910}; 911 912 913// Helper object for walking previous versions. This helper cleans up 914// the Handles that it allocates when the helper object is destroyed. 915// The PreviousVersionInfo object returned by next_previous_version() 916// is only valid until a subsequent call to next_previous_version() or 917// the helper object is destroyed. 918class PreviousVersionWalker : public StackObj { 919 private: 920 GrowableArray<PreviousVersionNode *>* _previous_versions; 921 int _current_index; 922 // Fields for cleaning up when we are done walking the previous versions: 923 // A HandleMark for the PreviousVersionInfo handles: 924 HandleMark _hm; 925 926 // It would be nice to have a ResourceMark field in this helper also, 927 // but the ResourceMark code says to be careful to delete handles held 928 // in GrowableArrays _before_ deleting the GrowableArray. Since we 929 // can't guarantee the order in which the fields are destroyed, we 930 // have to let the creator of the PreviousVersionWalker object do 931 // the right thing. Also, adding a ResourceMark here causes an 932 // include loop. 933 934 // A pointer to the current info object so we can handle the deletes. 935 PreviousVersionInfo * _current_p; 936 937 public: 938 PreviousVersionWalker(instanceKlass *ik); 939 ~PreviousVersionWalker(); 940 941 // Return the interesting information for the next previous version 942 // of the klass. Returns NULL if there are no more previous versions. 943 PreviousVersionInfo* next_previous_version(); 944}; 945