1 /* 2 * Copyright (c) 1997, 2011, 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 "oops/constMethodOop.hpp" 29 #include "oops/constantPoolOop.hpp" 30 #include "oops/fieldInfo.hpp" 31 #include "oops/instanceOop.hpp" 32 #include "oops/klassOop.hpp" 33 #include "oops/klassVtable.hpp" 34 #include "oops/objArrayOop.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 // [header ] klassOop 45 // [klass pointer ] klassOop 46 // [C++ vtbl pointer ] Klass 47 // [subtype cache ] Klass 48 // [instance size ] Klass 49 // [java mirror ] Klass 50 // [super ] Klass 51 // [access_flags ] Klass 52 // [name ] Klass 53 // [first subklass ] Klass 54 // [next sibling ] Klass 55 // [array klasses ] 56 // [methods ] 57 // [local interfaces ] 58 // [transitive interfaces ] 59 // [number of implementors ] 60 // [implementors ] klassOop[2] 61 // [fields ] 62 // [constants ] 63 // [class loader ] 64 // [protection domain ] 65 // [signers ] 66 // [source file name ] 67 // [inner classes ] 68 // [static field size ] 69 // [nonstatic field size ] 70 // [static oop fields size ] 71 // [nonstatic oop maps size ] 72 // [has finalize method ] 73 // [deoptimization mark bit ] 74 // [initialization state ] 75 // [initializing thread ] 76 // [Java vtable length ] 77 // [oop map cache (stack maps) ] 78 // [EMBEDDED Java vtable ] size in words = vtable_len 79 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size 80 // 81 // The embedded nonstatic oop-map blocks are short pairs (offset, length) indicating 82 // where oops are located in instances of this klass. 83 84 85 // forward declaration for class -- see below for definition 86 class SuperTypeClosure; 87 class JNIid; 88 class jniIdMapBase; 89 class BreakpointInfo; 90 class fieldDescriptor; 91 class DepChange; 92 class nmethodBucket; 93 class PreviousVersionNode; 94 class JvmtiCachedClassFieldMap; 95 96 // This is used in iterators below. 97 class FieldClosure: public StackObj { 98 public: 99 virtual void do_field(fieldDescriptor* fd) = 0; 100 }; 101 102 #ifndef PRODUCT 103 // Print fields. 104 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. 105 class FieldPrinter: public FieldClosure { 106 oop _obj; 107 outputStream* _st; 108 public: 109 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} 110 void do_field(fieldDescriptor* fd); 111 }; 112 #endif // !PRODUCT 113 114 // ValueObjs embedded in klass. Describes where oops are located in instances of 115 // this klass. 116 class OopMapBlock VALUE_OBJ_CLASS_SPEC { 117 public: 118 // Byte offset of the first oop mapped by this block. 119 int offset() const { return _offset; } 120 void set_offset(int offset) { _offset = offset; } 121 122 // Number of oops in this block. 123 uint count() const { return _count; } 124 void set_count(uint count) { _count = count; } 125 126 // sizeof(OopMapBlock) in HeapWords. 127 static const int size_in_words() { 128 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >> 129 LogHeapWordSize; 130 } 131 132 private: 133 int _offset; 134 uint _count; 135 }; 136 137 class instanceKlass: public Klass { 138 friend class VMStructs; 139 public: 140 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 141 // of the class loading & initialization procedure, and the use of the states. 142 enum ClassState { 143 unparsable_by_gc = 0, // object is not yet parsable by gc. Value of _init_state at object allocation. 144 allocated, // allocated (but not yet linked) 145 loaded, // loaded and inserted in class hierarchy (but not linked yet) 146 linked, // successfully linked/verified (but not initialized yet) 147 being_initialized, // currently running class initializer 148 fully_initialized, // initialized (successfull final state) 149 initialization_error // error happened during initialization 150 }; 151 152 public: 153 oop* oop_block_beg() const { return adr_array_klasses(); } 154 oop* oop_block_end() const { return adr_methods_default_annotations() + 1; } 155 156 enum { 157 implementors_limit = 2 // how many implems can we track? 158 }; 159 160 protected: 161 // 162 // The oop block. See comment in klass.hpp before making changes. 163 // 164 165 // Array classes holding elements of this class. 166 klassOop _array_klasses; 167 // Method array. 168 objArrayOop _methods; 169 // Int array containing the original order of method in the class file (for 170 // JVMTI). 171 typeArrayOop _method_ordering; 172 // Interface (klassOops) this class declares locally to implement. 173 objArrayOop _local_interfaces; 174 // Interface (klassOops) this class implements transitively. 175 objArrayOop _transitive_interfaces; 176 // Instance and static variable information, 5-tuples of shorts [access, name 177 // index, sig index, initval index, offset]. 178 typeArrayOop _fields; 179 // Constant pool for this class. 180 constantPoolOop _constants; 181 // Class loader used to load this class, NULL if VM loader used. 182 oop _class_loader; 183 // Protection domain. 184 oop _protection_domain; 185 // Host class, which grants its access privileges to this class also. 186 // This is only non-null for an anonymous class (JSR 292 enabled). 187 // The host class is either named, or a previously loaded anonymous class. 188 klassOop _host_klass; 189 // Class signers. 190 objArrayOop _signers; 191 // inner_classes attribute. 192 typeArrayOop _inner_classes; 193 // Implementors of this interface (not valid if it overflows) 194 klassOop _implementors[implementors_limit]; 195 // Annotations for this class, or null if none. 196 typeArrayOop _class_annotations; 197 // Annotation objects (byte arrays) for fields, or null if no annotations. 198 // Indices correspond to entries (not indices) in fields array. 199 objArrayOop _fields_annotations; 200 // Annotation objects (byte arrays) for methods, or null if no annotations. 201 // Index is the idnum, which is initially the same as the methods array index. 202 objArrayOop _methods_annotations; 203 // Annotation objects (byte arrays) for methods' parameters, or null if no 204 // such annotations. 205 // Index is the idnum, which is initially the same as the methods array index. 206 objArrayOop _methods_parameter_annotations; 207 // Annotation objects (byte arrays) for methods' default values, or null if no 208 // such annotations. 209 // Index is the idnum, which is initially the same as the methods array index. 210 objArrayOop _methods_default_annotations; 211 212 // 213 // End of the oop block. 214 // 215 216 // Name of source file containing this klass, NULL if not specified. 217 Symbol* _source_file_name; 218 // the source debug extension for this klass, NULL if not specified. 219 Symbol* _source_debug_extension; 220 // Generic signature, or null if none. 221 Symbol* _generic_signature; 222 // Array name derived from this class which needs unreferencing 223 // if this class is unloaded. 224 Symbol* _array_name; 225 226 // Number of heapOopSize words used by non-static fields in this klass 227 // (including inherited fields but after header_size()). 228 int _nonstatic_field_size; 229 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 230 u2 _static_oop_field_count;// number of static oop fields in this klass 231 u2 _java_fields_count; // The number of declared Java fields 232 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 233 234 bool _is_marked_dependent; // used for marking during flushing and deoptimization 235 bool _rewritten; // methods rewritten. 236 bool _has_nonstatic_fields; // for sizing with UseCompressedOops 237 bool _should_verify_class; // allow caching of preverification 238 u2 _minor_version; // minor version number of class file 239 u2 _major_version; // major version number of class file 240 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) 241 int _vtable_len; // length of Java vtable (in words) 242 int _itable_len; // length of Java itable (in words) 243 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 244 JNIid* _jni_ids; // First JNI identifier for static fields in this class 245 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 246 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL 247 nmethodBucket* _dependencies; // list of dependent nmethods 248 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 249 BreakpointInfo* _breakpoints; // bpt lists, managed by methodOop 250 int _nof_implementors; // No of implementors of this interface (zero if not an interface) 251 // Array of interesting part(s) of the previous version(s) of this 252 // instanceKlass. See PreviousVersionWalker below. 253 GrowableArray<PreviousVersionNode *>* _previous_versions; 254 u2 _enclosing_method_class_index; // Constant pool index for class of enclosing method, or 0 if none 255 u2 _enclosing_method_method_index; // Constant pool index for name and type of enclosing method, or 0 if none 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 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 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 266 267 u1 _reference_type; // reference type 268 269 // embedded Java vtable follows here 270 // embedded Java itables follows here 271 // embedded static fields follows here 272 // embedded nonstatic oop-map blocks follows here 273 274 friend class instanceKlassKlass; 275 friend class SystemDictionary; 276 277 public: 278 bool has_nonstatic_fields() const { return _has_nonstatic_fields; } 279 void set_has_nonstatic_fields(bool b) { _has_nonstatic_fields = b; } 280 281 // field sizes 282 int nonstatic_field_size() const { return _nonstatic_field_size; } 283 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 284 285 int static_field_size() const { return _static_field_size; } 286 void set_static_field_size(int size) { _static_field_size = size; } 287 288 int static_oop_field_count() const { return (int)_static_oop_field_count; } 289 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 290 291 // Java vtable 292 int vtable_length() const { return _vtable_len; } 293 void set_vtable_length(int len) { _vtable_len = len; } 294 295 // Java itable 296 int itable_length() const { return _itable_len; } 297 void set_itable_length(int len) { _itable_len = len; } 298 299 // array klasses 300 klassOop array_klasses() const { return _array_klasses; } 301 void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); } 302 303 // methods 304 objArrayOop methods() const { return _methods; } 305 void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); } 306 methodOop method_with_idnum(int idnum); 307 308 // method ordering 309 typeArrayOop method_ordering() const { return _method_ordering; } 310 void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); } 311 312 // interfaces 313 objArrayOop local_interfaces() const { return _local_interfaces; } 314 void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); } 315 objArrayOop transitive_interfaces() const { return _transitive_interfaces; } 316 void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); } 317 318 private: 319 friend class fieldDescriptor; 320 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 321 322 public: 323 int field_offset (int index) const { return field(index)->offset(); } 324 int field_access_flags(int index) const { return field(index)->access_flags(); } 325 Symbol* field_name (int index) const { return field(index)->name(constants()); } 326 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 327 328 // Number of Java declared fields 329 int java_fields_count() const { return (int)_java_fields_count; } 330 331 // Number of fields including any injected fields 332 int all_fields_count() const { return _fields->length() / sizeof(FieldInfo::field_slots); } 333 334 typeArrayOop fields() const { return _fields; } 335 336 void set_fields(typeArrayOop f, u2 java_fields_count) { 337 oop_store_without_check((oop*) &_fields, (oop) f); 338 _java_fields_count = java_fields_count; 339 } 340 341 // inner classes 342 typeArrayOop inner_classes() const { return _inner_classes; } 343 void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) f); } 344 345 enum InnerClassAttributeOffset { 346 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 347 inner_class_inner_class_info_offset = 0, 348 inner_class_outer_class_info_offset = 1, 349 inner_class_inner_name_offset = 2, 350 inner_class_access_flags_offset = 3, 351 inner_class_next_offset = 4 352 }; 353 354 // method override check 355 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 356 357 // package 358 bool is_same_class_package(klassOop class2); 359 bool is_same_class_package(oop classloader2, Symbol* classname2); 360 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2); 361 362 // find an enclosing class (defined where original code was, in jvm.cpp!) 363 klassOop compute_enclosing_class(bool* inner_is_member, TRAPS) { 364 instanceKlassHandle self(THREAD, this->as_klassOop()); 365 return compute_enclosing_class_impl(self, inner_is_member, THREAD); 366 } 367 static klassOop compute_enclosing_class_impl(instanceKlassHandle self, 368 bool* inner_is_member, TRAPS); 369 370 // tell if two classes have the same enclosing class (at package level) 371 bool is_same_package_member(klassOop class2, TRAPS) { 372 instanceKlassHandle self(THREAD, this->as_klassOop()); 373 return is_same_package_member_impl(self, class2, THREAD); 374 } 375 static bool is_same_package_member_impl(instanceKlassHandle self, 376 klassOop class2, TRAPS); 377 378 // initialization state 379 bool is_loaded() const { return _init_state >= loaded; } 380 bool is_linked() const { return _init_state >= linked; } 381 bool is_initialized() const { return _init_state == fully_initialized; } 382 bool is_not_initialized() const { return _init_state < being_initialized; } 383 bool is_being_initialized() const { return _init_state == being_initialized; } 384 bool is_in_error_state() const { return _init_state == initialization_error; } 385 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 386 ClassState init_state() { return (ClassState)_init_state; } 387 bool is_rewritten() const { return _rewritten; } 388 389 // defineClass specified verification 390 bool should_verify_class() const { return _should_verify_class; } 391 void set_should_verify_class(bool value) { _should_verify_class = value; } 392 393 // marking 394 bool is_marked_dependent() const { return _is_marked_dependent; } 395 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 396 397 // initialization (virtuals from Klass) 398 bool should_be_initialized() const; // means that initialize should be called 399 void initialize(TRAPS); 400 void link_class(TRAPS); 401 bool link_class_or_fail(TRAPS); // returns false on failure 402 void unlink_class(); 403 void rewrite_class(TRAPS); 404 void relocate_and_link_methods(TRAPS); 405 methodOop class_initializer(); 406 407 // set the class to initialized if no static initializer is present 408 void eager_initialize(Thread *thread); 409 410 // reference type 411 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 412 void set_reference_type(ReferenceType t) { 413 assert(t == (u1)t, "overflow"); 414 _reference_type = (u1)t; 415 } 416 417 static ByteSize reference_type_offset() { return in_ByteSize(sizeof(klassOopDesc) + offset_of(instanceKlass, _reference_type)); } 418 419 // find local field, returns true if found 420 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 421 // find field in direct superinterfaces, returns the interface in which the field is defined 422 klassOop find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 423 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 424 klassOop find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 425 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 426 klassOop find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 427 428 // find a non-static or static field given its offset within the class. 429 bool contains_field_offset(int offset) { 430 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); 431 } 432 433 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 434 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 435 436 // find a local method (returns NULL if not found) 437 methodOop find_method(Symbol* name, Symbol* signature) const; 438 static methodOop find_method(objArrayOop methods, Symbol* name, Symbol* signature); 439 440 // lookup operation (returns NULL if not found) 441 methodOop uncached_lookup_method(Symbol* name, Symbol* signature) const; 442 443 // lookup a method in all the interfaces that this class implements 444 // (returns NULL if not found) 445 methodOop lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const; 446 447 // constant pool 448 constantPoolOop constants() const { return _constants; } 449 void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); } 450 451 // class loader 452 oop class_loader() const { return _class_loader; } 453 void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); } 454 455 // protection domain 456 oop protection_domain() { return _protection_domain; } 457 void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); } 458 459 // host class 460 oop host_klass() const { return _host_klass; } 461 void set_host_klass(oop host) { oop_store((oop*) &_host_klass, host); } 462 bool is_anonymous() const { return _host_klass != NULL; } 463 464 // signers 465 objArrayOop signers() const { return _signers; } 466 void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); } 467 468 // source file name 469 Symbol* source_file_name() const { return _source_file_name; } 470 void set_source_file_name(Symbol* n); 471 472 // minor and major version numbers of class file 473 u2 minor_version() const { return _minor_version; } 474 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 475 u2 major_version() const { return _major_version; } 476 void set_major_version(u2 major_version) { _major_version = major_version; } 477 478 // source debug extension 479 Symbol* source_debug_extension() const { return _source_debug_extension; } 480 void set_source_debug_extension(Symbol* n); 481 482 // symbol unloading support (refcount already added) 483 Symbol* array_name() { return _array_name; } 484 void set_array_name(Symbol* name) { assert(_array_name == NULL, "name already created"); _array_name = name; } 485 486 // nonstatic oop-map blocks 487 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 488 return oop_map_count * OopMapBlock::size_in_words(); 489 } 490 unsigned int nonstatic_oop_map_count() const { 491 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 492 } 493 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 494 void set_nonstatic_oop_map_size(int words) { 495 _nonstatic_oop_map_size = words; 496 } 497 498 // RedefineClasses() support for previous versions: 499 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods, 500 int emcp_method_count); 501 // If the _previous_versions array is non-NULL, then this klass 502 // has been redefined at least once even if we aren't currently 503 // tracking a previous version. 504 bool has_been_redefined() const { return _previous_versions != NULL; } 505 bool has_previous_version() const; 506 void init_previous_versions() { 507 _previous_versions = NULL; 508 } 509 GrowableArray<PreviousVersionNode *>* previous_versions() const { 510 return _previous_versions; 511 } 512 513 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 514 void set_cached_class_file(unsigned char *class_file_bytes, 515 jint class_file_len) { _cached_class_file_len = class_file_len; 516 _cached_class_file_bytes = class_file_bytes; } 517 jint get_cached_class_file_len() { return _cached_class_file_len; } 518 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; } 519 520 // JVMTI: Support for caching of field indices, types, and offsets 521 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 522 _jvmti_cached_class_field_map = descriptor; 523 } 524 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 525 return _jvmti_cached_class_field_map; 526 } 527 528 // for adding methods, constMethodOopDesc::UNSET_IDNUM means no more ids available 529 inline u2 next_method_idnum(); 530 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 531 532 // generics support 533 Symbol* generic_signature() const { return _generic_signature; } 534 void set_generic_signature(Symbol* sig) { _generic_signature = sig; } 535 536 u2 enclosing_method_class_index() const { return _enclosing_method_class_index; } 537 u2 enclosing_method_method_index() const { return _enclosing_method_method_index; } 538 void set_enclosing_method_indices(u2 class_index, 539 u2 method_index) { _enclosing_method_class_index = class_index; 540 _enclosing_method_method_index = method_index; } 541 542 // jmethodID support 543 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, 544 methodHandle method_h); 545 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h, 546 size_t idnum, jmethodID new_id, jmethodID* new_jmeths, 547 jmethodID* to_dealloc_id_p, 548 jmethodID** to_dealloc_jmeths_p); 549 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 550 size_t *length_p, jmethodID* id_p); 551 jmethodID jmethod_id_or_null(methodOop method); 552 553 // cached itable index support 554 void set_cached_itable_index(size_t idnum, int index); 555 int cached_itable_index(size_t idnum); 556 557 // annotations support 558 typeArrayOop class_annotations() const { return _class_annotations; } 559 objArrayOop fields_annotations() const { return _fields_annotations; } 560 objArrayOop methods_annotations() const { return _methods_annotations; } 561 objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; } 562 objArrayOop methods_default_annotations() const { return _methods_default_annotations; } 563 void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); } 564 void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); } 565 void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); } 566 void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); } 567 void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); } 568 typeArrayOop get_method_annotations_of(int idnum) 569 { return get_method_annotations_from(idnum, _methods_annotations); } 570 typeArrayOop get_method_parameter_annotations_of(int idnum) 571 { return get_method_annotations_from(idnum, _methods_parameter_annotations); } 572 typeArrayOop get_method_default_annotations_of(int idnum) 573 { return get_method_annotations_from(idnum, _methods_default_annotations); } 574 void set_method_annotations_of(int idnum, typeArrayOop anno) 575 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } 576 void set_method_parameter_annotations_of(int idnum, typeArrayOop anno) 577 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } 578 void set_method_default_annotations_of(int idnum, typeArrayOop anno) 579 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } 580 581 // allocation 582 DEFINE_ALLOCATE_PERMANENT(instanceKlass); 583 instanceOop allocate_instance(TRAPS); 584 instanceOop allocate_permanent_instance(TRAPS); 585 586 // additional member function to return a handle 587 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } 588 589 objArrayOop allocate_objArray(int n, int length, TRAPS); 590 // Helper function 591 static instanceOop register_finalizer(instanceOop i, TRAPS); 592 593 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 594 // if not, throw either an Error or an Exception. 595 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 596 597 // initialization 598 void call_class_initializer(TRAPS); 599 void set_initialization_state_and_notify(ClassState state, TRAPS); 600 601 // OopMapCache support 602 OopMapCache* oop_map_cache() { return _oop_map_cache; } 603 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 604 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry); 605 606 // JNI identifier support (for static fields - for jni performance) 607 JNIid* jni_ids() { return _jni_ids; } 608 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 609 JNIid* jni_id_for(int offset); 610 611 // maintenance of deoptimization dependencies 612 int mark_dependent_nmethods(DepChange& changes); 613 void add_dependent_nmethod(nmethod* nm); 614 void remove_dependent_nmethod(nmethod* nm); 615 616 // On-stack replacement support 617 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 618 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 619 void add_osr_nmethod(nmethod* n); 620 void remove_osr_nmethod(nmethod* n); 621 nmethod* lookup_osr_nmethod(const methodOop m, int bci, int level, bool match_level) const; 622 623 // Breakpoint support (see methods on methodOop for details) 624 BreakpointInfo* breakpoints() const { return _breakpoints; }; 625 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 626 627 // support for stub routines 628 static ByteSize init_state_offset() { return in_ByteSize(sizeof(klassOopDesc) + offset_of(instanceKlass, _init_state)); } 629 static ByteSize init_thread_offset() { return in_ByteSize(sizeof(klassOopDesc) + offset_of(instanceKlass, _init_thread)); } 630 631 // subclass/subinterface checks 632 bool implements_interface(klassOop k) const; 633 634 // Access to implementors of an interface. We only store the count 635 // of implementors, and in case, there are only a few 636 // implementors, we store them in a short list. 637 // This accessor returns NULL if we walk off the end of the list. 638 klassOop implementor(int i) const { 639 return (i < implementors_limit)? _implementors[i]: (klassOop) NULL; 640 } 641 int nof_implementors() const { return _nof_implementors; } 642 void add_implementor(klassOop k); // k is a new class that implements this interface 643 void init_implementor(); // initialize 644 645 // link this class into the implementors list of every interface it implements 646 void process_interfaces(Thread *thread); 647 648 // virtual operations from Klass 649 bool is_leaf_class() const { return _subklass == NULL; } 650 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS); 651 bool compute_is_subtype_of(klassOop k); 652 bool can_be_primary_super_slow() const; 653 klassOop java_super() const { return super(); } 654 int oop_size(oop obj) const { return size_helper(); } 655 int klass_oop_size() const { return object_size(); } 656 bool oop_is_instance_slow() const { return true; } 657 658 // Iterators 659 void do_local_static_fields(FieldClosure* cl); 660 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 661 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS); 662 663 void methods_do(void f(methodOop method)); 664 void array_klasses_do(void f(klassOop k)); 665 void with_array_klasses_do(void f(klassOop k)); 666 bool super_types_do(SuperTypeClosure* blk); 667 668 // Casting from klassOop 669 static instanceKlass* cast(klassOop k) { 670 assert(k->is_klass(), "must be"); 671 Klass* kp = k->klass_part(); 672 assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass"); 673 return (instanceKlass*) kp; 674 } 675 676 // Sizing (in words) 677 static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); } 678 int object_size() const { return object_size(align_object_offset(vtable_length()) + align_object_offset(itable_length()) + nonstatic_oop_map_size()); } 679 static int vtable_start_offset() { return header_size(); } 680 static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; } 681 static int object_size(int extra) { return align_object_size(header_size() + extra); } 682 683 intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + vtable_start_offset(); } 684 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); } 685 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)as_klassOop(); } 686 687 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 688 689 address static_field_addr(int offset); 690 691 OopMapBlock* start_of_nonstatic_oop_maps() const { 692 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length())); 693 } 694 695 // Allocation profiling support 696 juint alloc_size() const { return _alloc_count * size_helper(); } 697 void set_alloc_size(juint n) {} 698 699 // Use this to return the size of an instance in heap words: 700 int size_helper() const { 701 return layout_helper_to_size_helper(layout_helper()); 702 } 703 704 // This bit is initialized in classFileParser.cpp. 705 // It is false under any of the following conditions: 706 // - the class is abstract (including any interface) 707 // - the class has a finalizer (if !RegisterFinalizersAtInit) 708 // - the class size is larger than FastAllocateSizeLimit 709 // - the class is java/lang/Class, which cannot be allocated directly 710 bool can_be_fastpath_allocated() const { 711 return !layout_helper_needs_slow_path(layout_helper()); 712 } 713 714 // Java vtable/itable 715 klassVtable* vtable() const; // return new klassVtable wrapper 716 inline methodOop method_at_vtable(int index); 717 klassItable* itable() const; // return new klassItable wrapper 718 methodOop method_at_itable(klassOop holder, int index, TRAPS); 719 720 // Garbage collection 721 void oop_follow_contents(oop obj); 722 int oop_adjust_pointers(oop obj); 723 bool object_is_parsable() const { return _init_state != unparsable_by_gc; } 724 // Value of _init_state must be zero (unparsable_by_gc) when klass field is set. 725 726 void follow_weak_klass_links( 727 BoolObjectClosure* is_alive, OopClosure* keep_alive); 728 void release_C_heap_structures(); 729 730 // Parallel Scavenge and Parallel Old 731 PARALLEL_GC_DECLS 732 733 // Naming 734 const char* signature_name() const; 735 736 // Iterators 737 int oop_oop_iterate(oop obj, OopClosure* blk) { 738 return oop_oop_iterate_v(obj, blk); 739 } 740 741 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) { 742 return oop_oop_iterate_v_m(obj, blk, mr); 743 } 744 745 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ 746 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ 747 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \ 748 MemRegion mr); 749 750 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL) 751 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL) 752 753 #ifndef SERIALGC 754 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ 755 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); 756 757 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 758 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 759 #endif // !SERIALGC 760 761 private: 762 // initialization state 763 #ifdef ASSERT 764 void set_init_state(ClassState state); 765 #else 766 void set_init_state(ClassState state) { _init_state = (u1)state; } 767 #endif 768 void set_rewritten() { _rewritten = true; } 769 void set_init_thread(Thread *thread) { _init_thread = thread; } 770 771 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 772 // The RedefineClasses() API can cause new method idnums to be needed 773 // which will cause the caches to grow. Safety requires different 774 // cache management logic if the caches can grow instead of just 775 // going from NULL to non-NULL. 776 bool idnum_can_increment() const { return has_been_redefined(); } 777 jmethodID* methods_jmethod_ids_acquire() const 778 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); } 779 void release_set_methods_jmethod_ids(jmethodID* jmeths) 780 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); } 781 782 int* methods_cached_itable_indices_acquire() const 783 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); } 784 void release_set_methods_cached_itable_indices(int* indices) 785 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); } 786 787 inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos); 788 void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); } 789 void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p); 790 791 // Offsets for memory management 792 oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;} 793 oop* adr_methods() const { return (oop*)&this->_methods;} 794 oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;} 795 oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;} 796 oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;} 797 oop* adr_fields() const { return (oop*)&this->_fields;} 798 oop* adr_constants() const { return (oop*)&this->_constants;} 799 oop* adr_class_loader() const { return (oop*)&this->_class_loader;} 800 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;} 801 oop* adr_host_klass() const { return (oop*)&this->_host_klass;} 802 oop* adr_signers() const { return (oop*)&this->_signers;} 803 oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;} 804 oop* adr_implementors() const { return (oop*)&this->_implementors[0];} 805 oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;} 806 oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;} 807 oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;} 808 oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;} 809 oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;} 810 oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;} 811 oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;} 812 813 // Static methods that are used to implement member methods where an exposed this pointer 814 // is needed due to possible GCs 815 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); 816 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); 817 static void initialize_impl (instanceKlassHandle this_oop, TRAPS); 818 static void eager_initialize_impl (instanceKlassHandle this_oop); 819 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS); 820 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS); 821 static klassOop array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS); 822 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS); 823 /* jni_id_for_impl for jfieldID only */ 824 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset); 825 826 // Returns the array class for the n'th dimension 827 klassOop array_klass_impl(bool or_null, int n, TRAPS); 828 829 // Returns the array class with this class as element type 830 klassOop array_klass_impl(bool or_null, TRAPS); 831 832 public: 833 // sharing support 834 virtual void remove_unshareable_info(); 835 virtual void shared_symbols_iterate(SymbolClosure* closure); 836 837 // jvm support 838 jint compute_modifier_flags(TRAPS) const; 839 840 public: 841 // JVMTI support 842 jint jvmti_class_status() const; 843 844 public: 845 // Printing 846 void oop_print_value_on(oop obj, outputStream* st); 847 #ifndef PRODUCT 848 void oop_print_on (oop obj, outputStream* st); 849 850 void print_dependent_nmethods(bool verbose = false); 851 bool is_dependent_nmethod(nmethod* nm); 852 #endif 853 854 // Verification 855 const char* internal_name() const; 856 void oop_verify_on(oop obj, outputStream* st); 857 }; 858 859 inline methodOop instanceKlass::method_at_vtable(int index) { 860 #ifndef PRODUCT 861 assert(index >= 0, "valid vtable index"); 862 if (DebugVtables) { 863 verify_vtable_index(index); 864 } 865 #endif 866 vtableEntry* ve = (vtableEntry*)start_of_vtable(); 867 return ve[index].method(); 868 } 869 870 inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) { 871 if (annos == NULL || annos->length() <= idnum) { 872 return NULL; 873 } 874 return typeArrayOop(annos->obj_at(idnum)); 875 } 876 877 // for adding methods 878 // UNSET_IDNUM return means no more ids available 879 inline u2 instanceKlass::next_method_idnum() { 880 if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) { 881 return constMethodOopDesc::UNSET_IDNUM; // no more ids available 882 } else { 883 return _idnum_allocated_count++; 884 } 885 } 886 887 888 /* JNIid class for jfieldIDs only */ 889 class JNIid: public CHeapObj { 890 friend class VMStructs; 891 private: 892 klassOop _holder; 893 JNIid* _next; 894 int _offset; 895 #ifdef ASSERT 896 bool _is_static_field_id; 897 #endif 898 899 public: 900 // Accessors 901 klassOop holder() const { return _holder; } 902 int offset() const { return _offset; } 903 JNIid* next() { return _next; } 904 // Constructor 905 JNIid(klassOop holder, int offset, JNIid* next); 906 // Identifier lookup 907 JNIid* find(int offset); 908 909 bool find_local_field(fieldDescriptor* fd) { 910 return instanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 911 } 912 913 // Garbage collection support 914 oop* holder_addr() { return (oop*)&_holder; } 915 void oops_do(OopClosure* f); 916 static void deallocate(JNIid* id); 917 // Debugging 918 #ifdef ASSERT 919 bool is_static_field_id() const { return _is_static_field_id; } 920 void set_is_static_field_id() { _is_static_field_id = true; } 921 #endif 922 void verify(klassOop holder); 923 }; 924 925 926 // If breakpoints are more numerous than just JVMTI breakpoints, 927 // consider compressing this data structure. 928 // It is currently a simple linked list defined in methodOop.hpp. 929 930 class BreakpointInfo; 931 932 933 // A collection point for interesting information about the previous 934 // version(s) of an instanceKlass. This class uses weak references to 935 // the information so that the information may be collected as needed 936 // by the system. If the information is shared, then a regular 937 // reference must be used because a weak reference would be seen as 938 // collectible. A GrowableArray of PreviousVersionNodes is attached 939 // to the instanceKlass as needed. See PreviousVersionWalker below. 940 class PreviousVersionNode : public CHeapObj { 941 private: 942 // A shared ConstantPool is never collected so we'll always have 943 // a reference to it so we can update items in the cache. We'll 944 // have a weak reference to a non-shared ConstantPool until all 945 // of the methods (EMCP or obsolete) have been collected; the 946 // non-shared ConstantPool becomes collectible at that point. 947 jobject _prev_constant_pool; // regular or weak reference 948 bool _prev_cp_is_weak; // true if not a shared ConstantPool 949 950 // If the previous version of the instanceKlass doesn't have any 951 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the 952 // EMCP methods have been collected, then _prev_EMCP_methods can 953 // have a length of zero. 954 GrowableArray<jweak>* _prev_EMCP_methods; 955 956 public: 957 PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak, 958 GrowableArray<jweak>* prev_EMCP_methods); 959 ~PreviousVersionNode(); 960 jobject prev_constant_pool() const { 961 return _prev_constant_pool; 962 } 963 GrowableArray<jweak>* prev_EMCP_methods() const { 964 return _prev_EMCP_methods; 965 } 966 }; 967 968 969 // A Handle-ized version of PreviousVersionNode. 970 class PreviousVersionInfo : public ResourceObj { 971 private: 972 constantPoolHandle _prev_constant_pool_handle; 973 // If the previous version of the instanceKlass doesn't have any 974 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the 975 // methods cannot be collected while we hold a handle, 976 // _prev_EMCP_methods should never have a length of zero. 977 GrowableArray<methodHandle>* _prev_EMCP_method_handles; 978 979 public: 980 PreviousVersionInfo(PreviousVersionNode *pv_node); 981 ~PreviousVersionInfo(); 982 constantPoolHandle prev_constant_pool_handle() const { 983 return _prev_constant_pool_handle; 984 } 985 GrowableArray<methodHandle>* prev_EMCP_method_handles() const { 986 return _prev_EMCP_method_handles; 987 } 988 }; 989 990 991 // Helper object for walking previous versions. This helper cleans up 992 // the Handles that it allocates when the helper object is destroyed. 993 // The PreviousVersionInfo object returned by next_previous_version() 994 // is only valid until a subsequent call to next_previous_version() or 995 // the helper object is destroyed. 996 class PreviousVersionWalker : public StackObj { 997 private: 998 GrowableArray<PreviousVersionNode *>* _previous_versions; 999 int _current_index; 1000 // Fields for cleaning up when we are done walking the previous versions: 1001 // A HandleMark for the PreviousVersionInfo handles: 1002 HandleMark _hm; 1003 1004 // It would be nice to have a ResourceMark field in this helper also, 1005 // but the ResourceMark code says to be careful to delete handles held 1006 // in GrowableArrays _before_ deleting the GrowableArray. Since we 1007 // can't guarantee the order in which the fields are destroyed, we 1008 // have to let the creator of the PreviousVersionWalker object do 1009 // the right thing. Also, adding a ResourceMark here causes an 1010 // include loop. 1011 1012 // A pointer to the current info object so we can handle the deletes. 1013 PreviousVersionInfo * _current_p; 1014 1015 public: 1016 PreviousVersionWalker(instanceKlass *ik); 1017 ~PreviousVersionWalker(); 1018 1019 // Return the interesting information for the next previous version 1020 // of the klass. Returns NULL if there are no more previous versions. 1021 PreviousVersionInfo* next_previous_version(); 1022 }; 1023 1024 1025 // 1026 // nmethodBucket is used to record dependent nmethods for 1027 // deoptimization. nmethod dependencies are actually <klass, method> 1028 // pairs but we really only care about the klass part for purposes of 1029 // finding nmethods which might need to be deoptimized. Instead of 1030 // recording the method, a count of how many times a particular nmethod 1031 // was recorded is kept. This ensures that any recording errors are 1032 // noticed since an nmethod should be removed as many times are it's 1033 // added. 1034 // 1035 class nmethodBucket: public CHeapObj { 1036 friend class VMStructs; 1037 private: 1038 nmethod* _nmethod; 1039 int _count; 1040 nmethodBucket* _next; 1041 1042 public: 1043 nmethodBucket(nmethod* nmethod, nmethodBucket* next) { 1044 _nmethod = nmethod; 1045 _next = next; 1046 _count = 1; 1047 } 1048 int count() { return _count; } 1049 int increment() { _count += 1; return _count; } 1050 int decrement() { _count -= 1; assert(_count >= 0, "don't underflow"); return _count; } 1051 nmethodBucket* next() { return _next; } 1052 void set_next(nmethodBucket* b) { _next = b; } 1053 nmethod* get_nmethod() { return _nmethod; } 1054 }; 1055 1056 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP