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 ReferenceType _reference_type; // reference type 244 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 245 JNIid* _jni_ids; // First JNI identifier for static fields in this class 246 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 247 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL 248 nmethodBucket* _dependencies; // list of dependent nmethods 249 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 250 BreakpointInfo* _breakpoints; // bpt lists, managed by methodOop 251 int _nof_implementors; // No of implementors of this interface (zero if not an interface) 252 // Array of interesting part(s) of the previous version(s) of this 253 // instanceKlass. See PreviousVersionWalker below. 254 GrowableArray<PreviousVersionNode *>* _previous_versions; 255 u2 _enclosing_method_class_index; // Constant pool index for class of enclosing method, or 0 if none 256 u2 _enclosing_method_method_index; // Constant pool index for name and type of enclosing method, or 0 if none 257 // JVMTI fields can be moved to their own structure - see 6315920 258 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH 259 jint _cached_class_file_len; // JVMTI: length of above 260 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 261 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 262 263 // Class states are defined as ClassState (see above). 264 // Place the _init_state here to utilize the unused 2-byte after 265 // _idnum_allocated_count. 266 u1 _init_state; // state of class 267 268 // embedded Java vtable follows here 269 // embedded Java itables follows here 270 // embedded static fields follows here 271 // embedded nonstatic oop-map blocks follows here 272 273 friend class instanceKlassKlass; 274 friend class SystemDictionary; 275 276 public: 277 bool has_nonstatic_fields() const { return _has_nonstatic_fields; } 278 void set_has_nonstatic_fields(bool b) { _has_nonstatic_fields = b; } 279 280 // field sizes 281 int nonstatic_field_size() const { return _nonstatic_field_size; } 282 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 283 284 int static_field_size() const { return _static_field_size; } 285 void set_static_field_size(int size) { _static_field_size = size; } 286 287 int static_oop_field_count() const { return (int)_static_oop_field_count; } 288 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 289 290 // Java vtable 291 int vtable_length() const { return _vtable_len; } 292 void set_vtable_length(int len) { _vtable_len = len; } 293 294 // Java itable 295 int itable_length() const { return _itable_len; } 296 void set_itable_length(int len) { _itable_len = len; } 297 298 // array klasses 299 klassOop array_klasses() const { return _array_klasses; } 300 void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); } 301 302 // methods 303 objArrayOop methods() const { return _methods; } 304 void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); } 305 methodOop method_with_idnum(int idnum); 306 307 // method ordering 308 typeArrayOop method_ordering() const { return _method_ordering; } 309 void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); } 310 311 // interfaces 312 objArrayOop local_interfaces() const { return _local_interfaces; } 313 void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); } 314 objArrayOop transitive_interfaces() const { return _transitive_interfaces; } 315 void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); } 316 317 private: 318 friend class fieldDescriptor; 319 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 320 321 public: 322 int field_offset (int index) const { return field(index)->offset(); } 323 int field_access_flags(int index) const { return field(index)->access_flags(); } 324 Symbol* field_name (int index) const { return field(index)->name(constants()); } 325 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 326 327 // Number of Java declared fields 328 int java_fields_count() const { return (int)_java_fields_count; } 329 330 // Number of fields including any injected fields 331 int all_fields_count() const { return _fields->length() / sizeof(FieldInfo::field_slots); } 332 333 typeArrayOop fields() const { return _fields; } 334 335 void set_fields(typeArrayOop f, u2 java_fields_count) { 336 oop_store_without_check((oop*) &_fields, (oop) f); 337 _java_fields_count = java_fields_count; 338 } 339 340 // inner classes 341 typeArrayOop inner_classes() const { return _inner_classes; } 342 void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) f); } 343 344 enum InnerClassAttributeOffset { 345 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 346 inner_class_inner_class_info_offset = 0, 347 inner_class_outer_class_info_offset = 1, 348 inner_class_inner_name_offset = 2, 349 inner_class_access_flags_offset = 3, 350 inner_class_next_offset = 4 351 }; 352 353 // method override check 354 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 355 356 // package 357 bool is_same_class_package(klassOop class2); 358 bool is_same_class_package(oop classloader2, Symbol* classname2); 359 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2); 360 361 // find an enclosing class (defined where original code was, in jvm.cpp!) 362 klassOop compute_enclosing_class(bool* inner_is_member, TRAPS) { 363 instanceKlassHandle self(THREAD, this->as_klassOop()); 364 return compute_enclosing_class_impl(self, inner_is_member, THREAD); 365 } 366 static klassOop compute_enclosing_class_impl(instanceKlassHandle self, 367 bool* inner_is_member, TRAPS); 368 369 // tell if two classes have the same enclosing class (at package level) 370 bool is_same_package_member(klassOop class2, TRAPS) { 371 instanceKlassHandle self(THREAD, this->as_klassOop()); 372 return is_same_package_member_impl(self, class2, THREAD); 373 } 374 static bool is_same_package_member_impl(instanceKlassHandle self, 375 klassOop class2, TRAPS); 376 377 // initialization state 378 bool is_loaded() const { return _init_state >= loaded; } 379 bool is_linked() const { return _init_state >= linked; } 380 bool is_initialized() const { return _init_state == fully_initialized; } 381 bool is_not_initialized() const { return _init_state < being_initialized; } 382 bool is_being_initialized() const { return _init_state == being_initialized; } 383 bool is_in_error_state() const { return _init_state == initialization_error; } 384 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 385 ClassState init_state() { return (ClassState)_init_state; } 386 bool is_rewritten() const { return _rewritten; } 387 388 // defineClass specified verification 389 bool should_verify_class() const { return _should_verify_class; } 390 void set_should_verify_class(bool value) { _should_verify_class = value; } 391 392 // marking 393 bool is_marked_dependent() const { return _is_marked_dependent; } 394 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 395 396 // initialization (virtuals from Klass) 397 bool should_be_initialized() const; // means that initialize should be called 398 void initialize(TRAPS); 399 void link_class(TRAPS); 400 bool link_class_or_fail(TRAPS); // returns false on failure 401 void unlink_class(); 402 void rewrite_class(TRAPS); 403 void relocate_and_link_methods(TRAPS); 404 methodOop class_initializer(); 405 406 // set the class to initialized if no static initializer is present 407 void eager_initialize(Thread *thread); 408 409 // reference type 410 ReferenceType reference_type() const { return _reference_type; } 411 void set_reference_type(ReferenceType t) { _reference_type = t; } 412 413 static ByteSize reference_type_offset() { return in_ByteSize(sizeof(klassOopDesc) + offset_of(instanceKlass, _reference_type)); } 414 415 // find local field, returns true if found 416 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 417 // find field in direct superinterfaces, returns the interface in which the field is defined 418 klassOop find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 419 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 420 klassOop find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 421 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 422 klassOop find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 423 424 // find a non-static or static field given its offset within the class. 425 bool contains_field_offset(int offset) { 426 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); 427 } 428 429 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 430 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 431 432 // find a local method (returns NULL if not found) 433 methodOop find_method(Symbol* name, Symbol* signature) const; 434 static methodOop find_method(objArrayOop methods, Symbol* name, Symbol* signature); 435 436 // lookup operation (returns NULL if not found) 437 methodOop uncached_lookup_method(Symbol* name, Symbol* signature) const; 438 439 // lookup a method in all the interfaces that this class implements 440 // (returns NULL if not found) 441 methodOop lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const; 442 443 // constant pool 444 constantPoolOop constants() const { return _constants; } 445 void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); } 446 447 // class loader 448 oop class_loader() const { return _class_loader; } 449 void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); } 450 451 // protection domain 452 oop protection_domain() { return _protection_domain; } 453 void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); } 454 455 // host class 456 oop host_klass() const { return _host_klass; } 457 void set_host_klass(oop host) { oop_store((oop*) &_host_klass, host); } 458 bool is_anonymous() const { return _host_klass != NULL; } 459 460 // signers 461 objArrayOop signers() const { return _signers; } 462 void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); } 463 464 // source file name 465 Symbol* source_file_name() const { return _source_file_name; } 466 void set_source_file_name(Symbol* n); 467 468 // minor and major version numbers of class file 469 u2 minor_version() const { return _minor_version; } 470 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 471 u2 major_version() const { return _major_version; } 472 void set_major_version(u2 major_version) { _major_version = major_version; } 473 474 // source debug extension 475 Symbol* source_debug_extension() const { return _source_debug_extension; } 476 void set_source_debug_extension(Symbol* n); 477 478 // symbol unloading support (refcount already added) 479 Symbol* array_name() { return _array_name; } 480 void set_array_name(Symbol* name) { assert(_array_name == NULL, "name already created"); _array_name = name; } 481 482 // nonstatic oop-map blocks 483 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 484 return oop_map_count * OopMapBlock::size_in_words(); 485 } 486 unsigned int nonstatic_oop_map_count() const { 487 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 488 } 489 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 490 void set_nonstatic_oop_map_size(int words) { 491 _nonstatic_oop_map_size = words; 492 } 493 494 // RedefineClasses() support for previous versions: 495 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods, 496 int emcp_method_count); 497 // If the _previous_versions array is non-NULL, then this klass 498 // has been redefined at least once even if we aren't currently 499 // tracking a previous version. 500 bool has_been_redefined() const { return _previous_versions != NULL; } 501 bool has_previous_version() const; 502 void init_previous_versions() { 503 _previous_versions = NULL; 504 } 505 GrowableArray<PreviousVersionNode *>* previous_versions() const { 506 return _previous_versions; 507 } 508 509 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 510 void set_cached_class_file(unsigned char *class_file_bytes, 511 jint class_file_len) { _cached_class_file_len = class_file_len; 512 _cached_class_file_bytes = class_file_bytes; } 513 jint get_cached_class_file_len() { return _cached_class_file_len; } 514 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; } 515 516 // JVMTI: Support for caching of field indices, types, and offsets 517 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 518 _jvmti_cached_class_field_map = descriptor; 519 } 520 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 521 return _jvmti_cached_class_field_map; 522 } 523 524 // for adding methods, constMethodOopDesc::UNSET_IDNUM means no more ids available 525 inline u2 next_method_idnum(); 526 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 527 528 // generics support 529 Symbol* generic_signature() const { return _generic_signature; } 530 void set_generic_signature(Symbol* sig) { _generic_signature = sig; } 531 532 u2 enclosing_method_class_index() const { return _enclosing_method_class_index; } 533 u2 enclosing_method_method_index() const { return _enclosing_method_method_index; } 534 void set_enclosing_method_indices(u2 class_index, 535 u2 method_index) { _enclosing_method_class_index = class_index; 536 _enclosing_method_method_index = method_index; } 537 538 // jmethodID support 539 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, 540 methodHandle method_h); 541 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h, 542 size_t idnum, jmethodID new_id, jmethodID* new_jmeths, 543 jmethodID* to_dealloc_id_p, 544 jmethodID** to_dealloc_jmeths_p); 545 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 546 size_t *length_p, jmethodID* id_p); 547 jmethodID jmethod_id_or_null(methodOop method); 548 549 // cached itable index support 550 void set_cached_itable_index(size_t idnum, int index); 551 int cached_itable_index(size_t idnum); 552 553 // annotations support 554 typeArrayOop class_annotations() const { return _class_annotations; } 555 objArrayOop fields_annotations() const { return _fields_annotations; } 556 objArrayOop methods_annotations() const { return _methods_annotations; } 557 objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; } 558 objArrayOop methods_default_annotations() const { return _methods_default_annotations; } 559 void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); } 560 void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); } 561 void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); } 562 void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); } 563 void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); } 564 typeArrayOop get_method_annotations_of(int idnum) 565 { return get_method_annotations_from(idnum, _methods_annotations); } 566 typeArrayOop get_method_parameter_annotations_of(int idnum) 567 { return get_method_annotations_from(idnum, _methods_parameter_annotations); } 568 typeArrayOop get_method_default_annotations_of(int idnum) 569 { return get_method_annotations_from(idnum, _methods_default_annotations); } 570 void set_method_annotations_of(int idnum, typeArrayOop anno) 571 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } 572 void set_method_parameter_annotations_of(int idnum, typeArrayOop anno) 573 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } 574 void set_method_default_annotations_of(int idnum, typeArrayOop anno) 575 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } 576 577 // allocation 578 DEFINE_ALLOCATE_PERMANENT(instanceKlass); 579 instanceOop allocate_instance(TRAPS); 580 instanceOop allocate_permanent_instance(TRAPS); 581 582 // additional member function to return a handle 583 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } 584 585 objArrayOop allocate_objArray(int n, int length, TRAPS); 586 // Helper function 587 static instanceOop register_finalizer(instanceOop i, TRAPS); 588 589 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 590 // if not, throw either an Error or an Exception. 591 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 592 593 // initialization 594 void call_class_initializer(TRAPS); 595 void set_initialization_state_and_notify(ClassState state, TRAPS); 596 597 // OopMapCache support 598 OopMapCache* oop_map_cache() { return _oop_map_cache; } 599 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 600 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry); 601 602 // JNI identifier support (for static fields - for jni performance) 603 JNIid* jni_ids() { return _jni_ids; } 604 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 605 JNIid* jni_id_for(int offset); 606 607 // maintenance of deoptimization dependencies 608 int mark_dependent_nmethods(DepChange& changes); 609 void add_dependent_nmethod(nmethod* nm); 610 void remove_dependent_nmethod(nmethod* nm); 611 612 // On-stack replacement support 613 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 614 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 615 void add_osr_nmethod(nmethod* n); 616 void remove_osr_nmethod(nmethod* n); 617 nmethod* lookup_osr_nmethod(const methodOop m, int bci, int level, bool match_level) const; 618 619 // Breakpoint support (see methods on methodOop for details) 620 BreakpointInfo* breakpoints() const { return _breakpoints; }; 621 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 622 623 // support for stub routines 624 static ByteSize init_state_offset() { return in_ByteSize(sizeof(klassOopDesc) + offset_of(instanceKlass, _init_state)); } 625 static ByteSize init_thread_offset() { return in_ByteSize(sizeof(klassOopDesc) + offset_of(instanceKlass, _init_thread)); } 626 627 // subclass/subinterface checks 628 bool implements_interface(klassOop k) const; 629 630 // Access to implementors of an interface. We only store the count 631 // of implementors, and in case, there are only a few 632 // implementors, we store them in a short list. 633 // This accessor returns NULL if we walk off the end of the list. 634 klassOop implementor(int i) const { 635 return (i < implementors_limit)? _implementors[i]: (klassOop) NULL; 636 } 637 int nof_implementors() const { return _nof_implementors; } 638 void add_implementor(klassOop k); // k is a new class that implements this interface 639 void init_implementor(); // initialize 640 641 // link this class into the implementors list of every interface it implements 642 void process_interfaces(Thread *thread); 643 644 // virtual operations from Klass 645 bool is_leaf_class() const { return _subklass == NULL; } 646 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS); 647 bool compute_is_subtype_of(klassOop k); 648 bool can_be_primary_super_slow() const; 649 klassOop java_super() const { return super(); } 650 int oop_size(oop obj) const { return size_helper(); } 651 int klass_oop_size() const { return object_size(); } 652 bool oop_is_instance_slow() const { return true; } 653 654 // Iterators 655 void do_local_static_fields(FieldClosure* cl); 656 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 657 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS); 658 659 void methods_do(void f(methodOop method)); 660 void array_klasses_do(void f(klassOop k)); 661 void with_array_klasses_do(void f(klassOop k)); 662 bool super_types_do(SuperTypeClosure* blk); 663 664 // Casting from klassOop 665 static instanceKlass* cast(klassOop k) { 666 assert(k->is_klass(), "must be"); 667 Klass* kp = k->klass_part(); 668 assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass"); 669 return (instanceKlass*) kp; 670 } 671 672 // Sizing (in words) 673 static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); } 674 int object_size() const { return object_size(align_object_offset(vtable_length()) + align_object_offset(itable_length()) + nonstatic_oop_map_size()); } 675 static int vtable_start_offset() { return header_size(); } 676 static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; } 677 static int object_size(int extra) { return align_object_size(header_size() + extra); } 678 679 intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + vtable_start_offset(); } 680 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); } 681 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)as_klassOop(); } 682 683 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 684 685 address static_field_addr(int offset); 686 687 OopMapBlock* start_of_nonstatic_oop_maps() const { 688 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length())); 689 } 690 691 // Allocation profiling support 692 juint alloc_size() const { return _alloc_count * size_helper(); } 693 void set_alloc_size(juint n) {} 694 695 // Use this to return the size of an instance in heap words: 696 int size_helper() const { 697 return layout_helper_to_size_helper(layout_helper()); 698 } 699 700 // This bit is initialized in classFileParser.cpp. 701 // It is false under any of the following conditions: 702 // - the class is abstract (including any interface) 703 // - the class has a finalizer (if !RegisterFinalizersAtInit) 704 // - the class size is larger than FastAllocateSizeLimit 705 // - the class is java/lang/Class, which cannot be allocated directly 706 bool can_be_fastpath_allocated() const { 707 return !layout_helper_needs_slow_path(layout_helper()); 708 } 709 710 // Java vtable/itable 711 klassVtable* vtable() const; // return new klassVtable wrapper 712 inline methodOop method_at_vtable(int index); 713 klassItable* itable() const; // return new klassItable wrapper 714 methodOop method_at_itable(klassOop holder, int index, TRAPS); 715 716 // Garbage collection 717 void oop_follow_contents(oop obj); 718 int oop_adjust_pointers(oop obj); 719 bool object_is_parsable() const { return _init_state != unparsable_by_gc; } 720 // Value of _init_state must be zero (unparsable_by_gc) when klass field is set. 721 722 void follow_weak_klass_links( 723 BoolObjectClosure* is_alive, OopClosure* keep_alive); 724 void release_C_heap_structures(); 725 726 // Parallel Scavenge and Parallel Old 727 PARALLEL_GC_DECLS 728 729 // Naming 730 const char* signature_name() const; 731 732 // Iterators 733 int oop_oop_iterate(oop obj, OopClosure* blk) { 734 return oop_oop_iterate_v(obj, blk); 735 } 736 737 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) { 738 return oop_oop_iterate_v_m(obj, blk, mr); 739 } 740 741 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ 742 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ 743 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \ 744 MemRegion mr); 745 746 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL) 747 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL) 748 749 #ifndef SERIALGC 750 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ 751 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); 752 753 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 754 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 755 #endif // !SERIALGC 756 757 private: 758 // initialization state 759 #ifdef ASSERT 760 void set_init_state(ClassState state); 761 #else 762 void set_init_state(ClassState state) { _init_state = (u1)state; } 763 #endif 764 void set_rewritten() { _rewritten = true; } 765 void set_init_thread(Thread *thread) { _init_thread = thread; } 766 767 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 768 // The RedefineClasses() API can cause new method idnums to be needed 769 // which will cause the caches to grow. Safety requires different 770 // cache management logic if the caches can grow instead of just 771 // going from NULL to non-NULL. 772 bool idnum_can_increment() const { return has_been_redefined(); } 773 jmethodID* methods_jmethod_ids_acquire() const 774 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); } 775 void release_set_methods_jmethod_ids(jmethodID* jmeths) 776 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); } 777 778 int* methods_cached_itable_indices_acquire() const 779 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); } 780 void release_set_methods_cached_itable_indices(int* indices) 781 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); } 782 783 inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos); 784 void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); } 785 void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p); 786 787 // Offsets for memory management 788 oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;} 789 oop* adr_methods() const { return (oop*)&this->_methods;} 790 oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;} 791 oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;} 792 oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;} 793 oop* adr_fields() const { return (oop*)&this->_fields;} 794 oop* adr_constants() const { return (oop*)&this->_constants;} 795 oop* adr_class_loader() const { return (oop*)&this->_class_loader;} 796 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;} 797 oop* adr_host_klass() const { return (oop*)&this->_host_klass;} 798 oop* adr_signers() const { return (oop*)&this->_signers;} 799 oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;} 800 oop* adr_implementors() const { return (oop*)&this->_implementors[0];} 801 oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;} 802 oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;} 803 oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;} 804 oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;} 805 oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;} 806 oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;} 807 oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;} 808 809 // Static methods that are used to implement member methods where an exposed this pointer 810 // is needed due to possible GCs 811 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); 812 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); 813 static void initialize_impl (instanceKlassHandle this_oop, TRAPS); 814 static void eager_initialize_impl (instanceKlassHandle this_oop); 815 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS); 816 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS); 817 static klassOop array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS); 818 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS); 819 /* jni_id_for_impl for jfieldID only */ 820 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset); 821 822 // Returns the array class for the n'th dimension 823 klassOop array_klass_impl(bool or_null, int n, TRAPS); 824 825 // Returns the array class with this class as element type 826 klassOop array_klass_impl(bool or_null, TRAPS); 827 828 public: 829 // sharing support 830 virtual void remove_unshareable_info(); 831 virtual void shared_symbols_iterate(SymbolClosure* closure); 832 833 // jvm support 834 jint compute_modifier_flags(TRAPS) const; 835 836 public: 837 // JVMTI support 838 jint jvmti_class_status() const; 839 840 public: 841 // Printing 842 void oop_print_value_on(oop obj, outputStream* st); 843 #ifndef PRODUCT 844 void oop_print_on (oop obj, outputStream* st); 845 846 void print_dependent_nmethods(bool verbose = false); 847 bool is_dependent_nmethod(nmethod* nm); 848 #endif 849 850 // Verification 851 const char* internal_name() const; 852 void oop_verify_on(oop obj, outputStream* st); 853 }; 854 855 inline methodOop instanceKlass::method_at_vtable(int index) { 856 #ifndef PRODUCT 857 assert(index >= 0, "valid vtable index"); 858 if (DebugVtables) { 859 verify_vtable_index(index); 860 } 861 #endif 862 vtableEntry* ve = (vtableEntry*)start_of_vtable(); 863 return ve[index].method(); 864 } 865 866 inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) { 867 if (annos == NULL || annos->length() <= idnum) { 868 return NULL; 869 } 870 return typeArrayOop(annos->obj_at(idnum)); 871 } 872 873 // for adding methods 874 // UNSET_IDNUM return means no more ids available 875 inline u2 instanceKlass::next_method_idnum() { 876 if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) { 877 return constMethodOopDesc::UNSET_IDNUM; // no more ids available 878 } else { 879 return _idnum_allocated_count++; 880 } 881 } 882 883 884 /* JNIid class for jfieldIDs only */ 885 class JNIid: public CHeapObj { 886 friend class VMStructs; 887 private: 888 klassOop _holder; 889 JNIid* _next; 890 int _offset; 891 #ifdef ASSERT 892 bool _is_static_field_id; 893 #endif 894 895 public: 896 // Accessors 897 klassOop holder() const { return _holder; } 898 int offset() const { return _offset; } 899 JNIid* next() { return _next; } 900 // Constructor 901 JNIid(klassOop holder, int offset, JNIid* next); 902 // Identifier lookup 903 JNIid* find(int offset); 904 905 bool find_local_field(fieldDescriptor* fd) { 906 return instanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 907 } 908 909 // Garbage collection support 910 oop* holder_addr() { return (oop*)&_holder; } 911 void oops_do(OopClosure* f); 912 static void deallocate(JNIid* id); 913 // Debugging 914 #ifdef ASSERT 915 bool is_static_field_id() const { return _is_static_field_id; } 916 void set_is_static_field_id() { _is_static_field_id = true; } 917 #endif 918 void verify(klassOop holder); 919 }; 920 921 922 // If breakpoints are more numerous than just JVMTI breakpoints, 923 // consider compressing this data structure. 924 // It is currently a simple linked list defined in methodOop.hpp. 925 926 class BreakpointInfo; 927 928 929 // A collection point for interesting information about the previous 930 // version(s) of an instanceKlass. This class uses weak references to 931 // the information so that the information may be collected as needed 932 // by the system. If the information is shared, then a regular 933 // reference must be used because a weak reference would be seen as 934 // collectible. A GrowableArray of PreviousVersionNodes is attached 935 // to the instanceKlass as needed. See PreviousVersionWalker below. 936 class PreviousVersionNode : public CHeapObj { 937 private: 938 // A shared ConstantPool is never collected so we'll always have 939 // a reference to it so we can update items in the cache. We'll 940 // have a weak reference to a non-shared ConstantPool until all 941 // of the methods (EMCP or obsolete) have been collected; the 942 // non-shared ConstantPool becomes collectible at that point. 943 jobject _prev_constant_pool; // regular or weak reference 944 bool _prev_cp_is_weak; // true if not a shared ConstantPool 945 946 // If the previous version of the instanceKlass doesn't have any 947 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the 948 // EMCP methods have been collected, then _prev_EMCP_methods can 949 // have a length of zero. 950 GrowableArray<jweak>* _prev_EMCP_methods; 951 952 public: 953 PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak, 954 GrowableArray<jweak>* prev_EMCP_methods); 955 ~PreviousVersionNode(); 956 jobject prev_constant_pool() const { 957 return _prev_constant_pool; 958 } 959 GrowableArray<jweak>* prev_EMCP_methods() const { 960 return _prev_EMCP_methods; 961 } 962 }; 963 964 965 // A Handle-ized version of PreviousVersionNode. 966 class PreviousVersionInfo : public ResourceObj { 967 private: 968 constantPoolHandle _prev_constant_pool_handle; 969 // If the previous version of the instanceKlass doesn't have any 970 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the 971 // methods cannot be collected while we hold a handle, 972 // _prev_EMCP_methods should never have a length of zero. 973 GrowableArray<methodHandle>* _prev_EMCP_method_handles; 974 975 public: 976 PreviousVersionInfo(PreviousVersionNode *pv_node); 977 ~PreviousVersionInfo(); 978 constantPoolHandle prev_constant_pool_handle() const { 979 return _prev_constant_pool_handle; 980 } 981 GrowableArray<methodHandle>* prev_EMCP_method_handles() const { 982 return _prev_EMCP_method_handles; 983 } 984 }; 985 986 987 // Helper object for walking previous versions. This helper cleans up 988 // the Handles that it allocates when the helper object is destroyed. 989 // The PreviousVersionInfo object returned by next_previous_version() 990 // is only valid until a subsequent call to next_previous_version() or 991 // the helper object is destroyed. 992 class PreviousVersionWalker : public StackObj { 993 private: 994 GrowableArray<PreviousVersionNode *>* _previous_versions; 995 int _current_index; 996 // Fields for cleaning up when we are done walking the previous versions: 997 // A HandleMark for the PreviousVersionInfo handles: 998 HandleMark _hm; 999 1000 // It would be nice to have a ResourceMark field in this helper also, 1001 // but the ResourceMark code says to be careful to delete handles held 1002 // in GrowableArrays _before_ deleting the GrowableArray. Since we 1003 // can't guarantee the order in which the fields are destroyed, we 1004 // have to let the creator of the PreviousVersionWalker object do 1005 // the right thing. Also, adding a ResourceMark here causes an 1006 // include loop. 1007 1008 // A pointer to the current info object so we can handle the deletes. 1009 PreviousVersionInfo * _current_p; 1010 1011 public: 1012 PreviousVersionWalker(instanceKlass *ik); 1013 ~PreviousVersionWalker(); 1014 1015 // Return the interesting information for the next previous version 1016 // of the klass. Returns NULL if there are no more previous versions. 1017 PreviousVersionInfo* next_previous_version(); 1018 }; 1019 1020 1021 // 1022 // nmethodBucket is used to record dependent nmethods for 1023 // deoptimization. nmethod dependencies are actually <klass, method> 1024 // pairs but we really only care about the klass part for purposes of 1025 // finding nmethods which might need to be deoptimized. Instead of 1026 // recording the method, a count of how many times a particular nmethod 1027 // was recorded is kept. This ensures that any recording errors are 1028 // noticed since an nmethod should be removed as many times are it's 1029 // added. 1030 // 1031 class nmethodBucket: public CHeapObj { 1032 friend class VMStructs; 1033 private: 1034 nmethod* _nmethod; 1035 int _count; 1036 nmethodBucket* _next; 1037 1038 public: 1039 nmethodBucket(nmethod* nmethod, nmethodBucket* next) { 1040 _nmethod = nmethod; 1041 _next = next; 1042 _count = 1; 1043 } 1044 int count() { return _count; } 1045 int increment() { _count += 1; return _count; } 1046 int decrement() { _count -= 1; assert(_count >= 0, "don't underflow"); return _count; } 1047 nmethodBucket* next() { return _next; } 1048 void set_next(nmethodBucket* b) { _next = b; } 1049 nmethod* get_nmethod() { return _nmethod; } 1050 }; 1051 1052 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP