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 int _static_oop_field_count;// number of static oop fields in this klass 231 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 232 int _java_fields_count; // The number of declared Java fields 233 bool _is_marked_dependent; // used for marking during flushing and deoptimization 234 bool _rewritten; // methods rewritten. 235 bool _has_nonstatic_fields; // for sizing with UseCompressedOops 236 bool _should_verify_class; // allow caching of preverification 237 u2 _minor_version; // minor version number of class file 238 u2 _major_version; // major version number of class file 239 ClassState _init_state; // state of class 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 // embedded Java vtable follows here 264 // embedded Java itables follows here 265 // embedded static fields follows here 266 // embedded nonstatic oop-map blocks follows here 267 268 friend class instanceKlassKlass; 269 friend class SystemDictionary; 270 271 public: 272 bool has_nonstatic_fields() const { return _has_nonstatic_fields; } 273 void set_has_nonstatic_fields(bool b) { _has_nonstatic_fields = b; } 274 275 // field sizes 276 int nonstatic_field_size() const { return _nonstatic_field_size; } 277 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 278 279 int static_field_size() const { return _static_field_size; } 280 void set_static_field_size(int size) { _static_field_size = size; } 281 282 int static_oop_field_count() const { return _static_oop_field_count; } 283 void set_static_oop_field_count(int size) { _static_oop_field_count = size; } 284 285 // Java vtable 286 int vtable_length() const { return _vtable_len; } 287 void set_vtable_length(int len) { _vtable_len = len; } 288 289 // Java itable 290 int itable_length() const { return _itable_len; } 291 void set_itable_length(int len) { _itable_len = len; } 292 293 // array klasses 294 klassOop array_klasses() const { return _array_klasses; } 295 void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); } 296 297 // methods 298 objArrayOop methods() const { return _methods; } 299 void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); } 300 methodOop method_with_idnum(int idnum); 301 302 // method ordering 303 typeArrayOop method_ordering() const { return _method_ordering; } 304 void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); } 305 306 // interfaces 307 objArrayOop local_interfaces() const { return _local_interfaces; } 308 void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); } 309 objArrayOop transitive_interfaces() const { return _transitive_interfaces; } 310 void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); } 311 312 private: 313 friend class fieldDescriptor; 314 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 315 316 public: 317 int field_offset (int index) const { return field(index)->offset(); } 318 int field_access_flags(int index) const { return field(index)->access_flags(); } 319 Symbol* field_name (int index) const { return field(index)->name(constants()); } 320 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 321 322 // Number of Java declared fields 323 int java_fields_count() const { return _java_fields_count; } 324 325 // Number of fields including any injected fields 326 int all_fields_count() const { return _fields->length() / sizeof(FieldInfo::field_slots); } 327 328 typeArrayOop fields() const { return _fields; } 329 330 void set_fields(typeArrayOop f, int java_fields_count) { 331 oop_store_without_check((oop*) &_fields, (oop) f); 332 _java_fields_count = java_fields_count; 333 } 334 335 // inner classes 336 typeArrayOop inner_classes() const { return _inner_classes; } 337 void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) f); } 338 339 enum InnerClassAttributeOffset { 340 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 341 inner_class_inner_class_info_offset = 0, 342 inner_class_outer_class_info_offset = 1, 343 inner_class_inner_name_offset = 2, 344 inner_class_access_flags_offset = 3, 345 inner_class_next_offset = 4 346 }; 347 348 // method override check 349 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 350 351 // package 352 bool is_same_class_package(klassOop class2); 353 bool is_same_class_package(oop classloader2, Symbol* classname2); 354 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2); 355 356 // find an enclosing class (defined where original code was, in jvm.cpp!) 357 klassOop compute_enclosing_class(bool* inner_is_member, TRAPS) { 358 instanceKlassHandle self(THREAD, this->as_klassOop()); 359 return compute_enclosing_class_impl(self, inner_is_member, THREAD); 360 } 361 static klassOop compute_enclosing_class_impl(instanceKlassHandle self, 362 bool* inner_is_member, TRAPS); 363 364 // tell if two classes have the same enclosing class (at package level) 365 bool is_same_package_member(klassOop class2, TRAPS) { 366 instanceKlassHandle self(THREAD, this->as_klassOop()); 367 return is_same_package_member_impl(self, class2, THREAD); 368 } 369 static bool is_same_package_member_impl(instanceKlassHandle self, 370 klassOop class2, TRAPS); 371 372 // initialization state 373 bool is_loaded() const { return _init_state >= loaded; } 374 bool is_linked() const { return _init_state >= linked; } 375 bool is_initialized() const { return _init_state == fully_initialized; } 376 bool is_not_initialized() const { return _init_state < being_initialized; } 377 bool is_being_initialized() const { return _init_state == being_initialized; } 378 bool is_in_error_state() const { return _init_state == initialization_error; } 379 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 380 int get_init_state() { return _init_state; } // Useful for debugging 381 bool is_rewritten() const { return _rewritten; } 382 383 // defineClass specified verification 384 bool should_verify_class() const { return _should_verify_class; } 385 void set_should_verify_class(bool value) { _should_verify_class = value; } 386 387 // marking 388 bool is_marked_dependent() const { return _is_marked_dependent; } 389 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 390 391 // initialization (virtuals from Klass) 392 bool should_be_initialized() const; // means that initialize should be called 393 void initialize(TRAPS); 394 void link_class(TRAPS); 395 bool link_class_or_fail(TRAPS); // returns false on failure 396 void unlink_class(); 397 void rewrite_class(TRAPS); 398 void relocate_and_link_methods(TRAPS); 399 methodOop class_initializer(); 400 401 // set the class to initialized if no static initializer is present 402 void eager_initialize(Thread *thread); 403 404 // reference type 405 ReferenceType reference_type() const { return _reference_type; } 406 void set_reference_type(ReferenceType t) { _reference_type = t; } 407 408 static int reference_type_offset_in_bytes() { return offset_of(instanceKlass, _reference_type); } 409 410 // find local field, returns true if found 411 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 412 // find field in direct superinterfaces, returns the interface in which the field is defined 413 klassOop find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 414 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 415 klassOop find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 416 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 417 klassOop find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 418 419 // find a non-static or static field given its offset within the class. 420 bool contains_field_offset(int offset) { 421 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); 422 } 423 424 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 425 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 426 427 // find a local method (returns NULL if not found) 428 methodOop find_method(Symbol* name, Symbol* signature) const; 429 static methodOop find_method(objArrayOop methods, Symbol* name, Symbol* signature); 430 431 // lookup operation (returns NULL if not found) 432 methodOop uncached_lookup_method(Symbol* name, Symbol* signature) const; 433 434 // lookup a method in all the interfaces that this class implements 435 // (returns NULL if not found) 436 methodOop lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const; 437 438 // constant pool 439 constantPoolOop constants() const { return _constants; } 440 void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); } 441 442 // class loader 443 oop class_loader() const { return _class_loader; } 444 void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); } 445 446 // protection domain 447 oop protection_domain() { return _protection_domain; } 448 void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); } 449 450 // host class 451 oop host_klass() const { return _host_klass; } 452 void set_host_klass(oop host) { oop_store((oop*) &_host_klass, host); } 453 bool is_anonymous() const { return _host_klass != NULL; } 454 455 // signers 456 objArrayOop signers() const { return _signers; } 457 void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); } 458 459 // source file name 460 Symbol* source_file_name() const { return _source_file_name; } 461 void set_source_file_name(Symbol* n); 462 463 // minor and major version numbers of class file 464 u2 minor_version() const { return _minor_version; } 465 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 466 u2 major_version() const { return _major_version; } 467 void set_major_version(u2 major_version) { _major_version = major_version; } 468 469 // source debug extension 470 Symbol* source_debug_extension() const { return _source_debug_extension; } 471 void set_source_debug_extension(Symbol* n); 472 473 // symbol unloading support (refcount already added) 474 Symbol* array_name() { return _array_name; } 475 void set_array_name(Symbol* name) { assert(_array_name == NULL, "name already created"); _array_name = name; } 476 477 // nonstatic oop-map blocks 478 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 479 return oop_map_count * OopMapBlock::size_in_words(); 480 } 481 unsigned int nonstatic_oop_map_count() const { 482 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 483 } 484 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 485 void set_nonstatic_oop_map_size(int words) { 486 _nonstatic_oop_map_size = words; 487 } 488 489 // RedefineClasses() support for previous versions: 490 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods, 491 int emcp_method_count); 492 // If the _previous_versions array is non-NULL, then this klass 493 // has been redefined at least once even if we aren't currently 494 // tracking a previous version. 495 bool has_been_redefined() const { return _previous_versions != NULL; } 496 bool has_previous_version() const; 497 void init_previous_versions() { 498 _previous_versions = NULL; 499 } 500 GrowableArray<PreviousVersionNode *>* previous_versions() const { 501 return _previous_versions; 502 } 503 504 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 505 void set_cached_class_file(unsigned char *class_file_bytes, 506 jint class_file_len) { _cached_class_file_len = class_file_len; 507 _cached_class_file_bytes = class_file_bytes; } 508 jint get_cached_class_file_len() { return _cached_class_file_len; } 509 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; } 510 511 // JVMTI: Support for caching of field indices, types, and offsets 512 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 513 _jvmti_cached_class_field_map = descriptor; 514 } 515 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 516 return _jvmti_cached_class_field_map; 517 } 518 519 // for adding methods, constMethodOopDesc::UNSET_IDNUM means no more ids available 520 inline u2 next_method_idnum(); 521 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 522 523 // generics support 524 Symbol* generic_signature() const { return _generic_signature; } 525 void set_generic_signature(Symbol* sig) { _generic_signature = sig; } 526 527 u2 enclosing_method_class_index() const { return _enclosing_method_class_index; } 528 u2 enclosing_method_method_index() const { return _enclosing_method_method_index; } 529 void set_enclosing_method_indices(u2 class_index, 530 u2 method_index) { _enclosing_method_class_index = class_index; 531 _enclosing_method_method_index = method_index; } 532 533 // jmethodID support 534 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, 535 methodHandle method_h); 536 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h, 537 size_t idnum, jmethodID new_id, jmethodID* new_jmeths, 538 jmethodID* to_dealloc_id_p, 539 jmethodID** to_dealloc_jmeths_p); 540 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 541 size_t *length_p, jmethodID* id_p); 542 jmethodID jmethod_id_or_null(methodOop method); 543 544 // cached itable index support 545 void set_cached_itable_index(size_t idnum, int index); 546 int cached_itable_index(size_t idnum); 547 548 // annotations support 549 typeArrayOop class_annotations() const { return _class_annotations; } 550 objArrayOop fields_annotations() const { return _fields_annotations; } 551 objArrayOop methods_annotations() const { return _methods_annotations; } 552 objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; } 553 objArrayOop methods_default_annotations() const { return _methods_default_annotations; } 554 void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); } 555 void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); } 556 void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); } 557 void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); } 558 void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); } 559 typeArrayOop get_method_annotations_of(int idnum) 560 { return get_method_annotations_from(idnum, _methods_annotations); } 561 typeArrayOop get_method_parameter_annotations_of(int idnum) 562 { return get_method_annotations_from(idnum, _methods_parameter_annotations); } 563 typeArrayOop get_method_default_annotations_of(int idnum) 564 { return get_method_annotations_from(idnum, _methods_default_annotations); } 565 void set_method_annotations_of(int idnum, typeArrayOop anno) 566 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } 567 void set_method_parameter_annotations_of(int idnum, typeArrayOop anno) 568 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } 569 void set_method_default_annotations_of(int idnum, typeArrayOop anno) 570 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } 571 572 // allocation 573 DEFINE_ALLOCATE_PERMANENT(instanceKlass); 574 instanceOop allocate_instance(TRAPS); 575 instanceOop allocate_permanent_instance(TRAPS); 576 577 // additional member function to return a handle 578 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } 579 580 objArrayOop allocate_objArray(int n, int length, TRAPS); 581 // Helper function 582 static instanceOop register_finalizer(instanceOop i, TRAPS); 583 584 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 585 // if not, throw either an Error or an Exception. 586 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 587 588 // initialization 589 void call_class_initializer(TRAPS); 590 void set_initialization_state_and_notify(ClassState state, TRAPS); 591 592 // OopMapCache support 593 OopMapCache* oop_map_cache() { return _oop_map_cache; } 594 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 595 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry); 596 597 // JNI identifier support (for static fields - for jni performance) 598 JNIid* jni_ids() { return _jni_ids; } 599 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 600 JNIid* jni_id_for(int offset); 601 602 // maintenance of deoptimization dependencies 603 int mark_dependent_nmethods(DepChange& changes); 604 void add_dependent_nmethod(nmethod* nm); 605 void remove_dependent_nmethod(nmethod* nm); 606 607 // On-stack replacement support 608 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 609 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 610 void add_osr_nmethod(nmethod* n); 611 void remove_osr_nmethod(nmethod* n); 612 nmethod* lookup_osr_nmethod(const methodOop m, int bci, int level, bool match_level) const; 613 614 // Breakpoint support (see methods on methodOop for details) 615 BreakpointInfo* breakpoints() const { return _breakpoints; }; 616 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 617 618 // support for stub routines 619 static int init_state_offset_in_bytes() { return offset_of(instanceKlass, _init_state); } 620 static int init_thread_offset_in_bytes() { return offset_of(instanceKlass, _init_thread); } 621 622 // subclass/subinterface checks 623 bool implements_interface(klassOop k) const; 624 625 // Access to implementors of an interface. We only store the count 626 // of implementors, and in case, there are only a few 627 // implementors, we store them in a short list. 628 // This accessor returns NULL if we walk off the end of the list. 629 klassOop implementor(int i) const { 630 return (i < implementors_limit)? _implementors[i]: (klassOop) NULL; 631 } 632 int nof_implementors() const { return _nof_implementors; } 633 void add_implementor(klassOop k); // k is a new class that implements this interface 634 void init_implementor(); // initialize 635 636 // link this class into the implementors list of every interface it implements 637 void process_interfaces(Thread *thread); 638 639 // virtual operations from Klass 640 bool is_leaf_class() const { return _subklass == NULL; } 641 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS); 642 bool compute_is_subtype_of(klassOop k); 643 bool can_be_primary_super_slow() const; 644 klassOop java_super() const { return super(); } 645 int oop_size(oop obj) const { return size_helper(); } 646 int klass_oop_size() const { return object_size(); } 647 bool oop_is_instance_slow() const { return true; } 648 649 // Iterators 650 void do_local_static_fields(FieldClosure* cl); 651 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 652 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS); 653 654 void methods_do(void f(methodOop method)); 655 void array_klasses_do(void f(klassOop k)); 656 void with_array_klasses_do(void f(klassOop k)); 657 bool super_types_do(SuperTypeClosure* blk); 658 659 // Casting from klassOop 660 static instanceKlass* cast(klassOop k) { 661 assert(k->is_klass(), "must be"); 662 Klass* kp = k->klass_part(); 663 assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass"); 664 return (instanceKlass*) kp; 665 } 666 667 // Sizing (in words) 668 static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); } 669 int object_size() const { return object_size(align_object_offset(vtable_length()) + align_object_offset(itable_length()) + nonstatic_oop_map_size()); } 670 static int vtable_start_offset() { return header_size(); } 671 static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; } 672 static int object_size(int extra) { return align_object_size(header_size() + extra); } 673 674 intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + vtable_start_offset(); } 675 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); } 676 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)as_klassOop(); } 677 678 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 679 680 address static_field_addr(int offset); 681 682 OopMapBlock* start_of_nonstatic_oop_maps() const { 683 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length())); 684 } 685 686 // Allocation profiling support 687 juint alloc_size() const { return _alloc_count * size_helper(); } 688 void set_alloc_size(juint n) {} 689 690 // Use this to return the size of an instance in heap words: 691 int size_helper() const { 692 return layout_helper_to_size_helper(layout_helper()); 693 } 694 695 // This bit is initialized in classFileParser.cpp. 696 // It is false under any of the following conditions: 697 // - the class is abstract (including any interface) 698 // - the class has a finalizer (if !RegisterFinalizersAtInit) 699 // - the class size is larger than FastAllocateSizeLimit 700 // - the class is java/lang/Class, which cannot be allocated directly 701 bool can_be_fastpath_allocated() const { 702 return !layout_helper_needs_slow_path(layout_helper()); 703 } 704 705 // Java vtable/itable 706 klassVtable* vtable() const; // return new klassVtable wrapper 707 inline methodOop method_at_vtable(int index); 708 klassItable* itable() const; // return new klassItable wrapper 709 methodOop method_at_itable(klassOop holder, int index, TRAPS); 710 711 // Garbage collection 712 void oop_follow_contents(oop obj); 713 int oop_adjust_pointers(oop obj); 714 bool object_is_parsable() const { return _init_state != unparsable_by_gc; } 715 // Value of _init_state must be zero (unparsable_by_gc) when klass field is set. 716 717 void follow_weak_klass_links( 718 BoolObjectClosure* is_alive, OopClosure* keep_alive); 719 void release_C_heap_structures(); 720 721 // Parallel Scavenge and Parallel Old 722 PARALLEL_GC_DECLS 723 724 // Naming 725 const char* signature_name() const; 726 727 // Iterators 728 int oop_oop_iterate(oop obj, OopClosure* blk) { 729 return oop_oop_iterate_v(obj, blk); 730 } 731 732 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) { 733 return oop_oop_iterate_v_m(obj, blk, mr); 734 } 735 736 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ 737 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ 738 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \ 739 MemRegion mr); 740 741 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL) 742 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL) 743 744 #ifndef SERIALGC 745 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ 746 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); 747 748 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 749 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 750 #endif // !SERIALGC 751 752 private: 753 // initialization state 754 #ifdef ASSERT 755 void set_init_state(ClassState state); 756 #else 757 void set_init_state(ClassState state) { _init_state = state; } 758 #endif 759 void set_rewritten() { _rewritten = true; } 760 void set_init_thread(Thread *thread) { _init_thread = thread; } 761 762 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 763 // The RedefineClasses() API can cause new method idnums to be needed 764 // which will cause the caches to grow. Safety requires different 765 // cache management logic if the caches can grow instead of just 766 // going from NULL to non-NULL. 767 bool idnum_can_increment() const { return has_been_redefined(); } 768 jmethodID* methods_jmethod_ids_acquire() const 769 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); } 770 void release_set_methods_jmethod_ids(jmethodID* jmeths) 771 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); } 772 773 int* methods_cached_itable_indices_acquire() const 774 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); } 775 void release_set_methods_cached_itable_indices(int* indices) 776 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); } 777 778 inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos); 779 void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); } 780 void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p); 781 782 // Offsets for memory management 783 oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;} 784 oop* adr_methods() const { return (oop*)&this->_methods;} 785 oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;} 786 oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;} 787 oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;} 788 oop* adr_fields() const { return (oop*)&this->_fields;} 789 oop* adr_constants() const { return (oop*)&this->_constants;} 790 oop* adr_class_loader() const { return (oop*)&this->_class_loader;} 791 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;} 792 oop* adr_host_klass() const { return (oop*)&this->_host_klass;} 793 oop* adr_signers() const { return (oop*)&this->_signers;} 794 oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;} 795 oop* adr_implementors() const { return (oop*)&this->_implementors[0];} 796 oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;} 797 oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;} 798 oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;} 799 oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;} 800 oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;} 801 oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;} 802 oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;} 803 804 // Static methods that are used to implement member methods where an exposed this pointer 805 // is needed due to possible GCs 806 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); 807 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); 808 static void initialize_impl (instanceKlassHandle this_oop, TRAPS); 809 static void eager_initialize_impl (instanceKlassHandle this_oop); 810 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS); 811 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS); 812 static klassOop array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS); 813 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS); 814 /* jni_id_for_impl for jfieldID only */ 815 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset); 816 817 // Returns the array class for the n'th dimension 818 klassOop array_klass_impl(bool or_null, int n, TRAPS); 819 820 // Returns the array class with this class as element type 821 klassOop array_klass_impl(bool or_null, TRAPS); 822 823 public: 824 // sharing support 825 virtual void remove_unshareable_info(); 826 virtual void shared_symbols_iterate(SymbolClosure* closure); 827 828 // jvm support 829 jint compute_modifier_flags(TRAPS) const; 830 831 public: 832 // JVMTI support 833 jint jvmti_class_status() const; 834 835 public: 836 // Printing 837 void oop_print_value_on(oop obj, outputStream* st); 838 #ifndef PRODUCT 839 void oop_print_on (oop obj, outputStream* st); 840 841 void print_dependent_nmethods(bool verbose = false); 842 bool is_dependent_nmethod(nmethod* nm); 843 #endif 844 845 // Verification 846 const char* internal_name() const; 847 void oop_verify_on(oop obj, outputStream* st); 848 }; 849 850 inline methodOop instanceKlass::method_at_vtable(int index) { 851 #ifndef PRODUCT 852 assert(index >= 0, "valid vtable index"); 853 if (DebugVtables) { 854 verify_vtable_index(index); 855 } 856 #endif 857 vtableEntry* ve = (vtableEntry*)start_of_vtable(); 858 return ve[index].method(); 859 } 860 861 inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) { 862 if (annos == NULL || annos->length() <= idnum) { 863 return NULL; 864 } 865 return typeArrayOop(annos->obj_at(idnum)); 866 } 867 868 // for adding methods 869 // UNSET_IDNUM return means no more ids available 870 inline u2 instanceKlass::next_method_idnum() { 871 if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) { 872 return constMethodOopDesc::UNSET_IDNUM; // no more ids available 873 } else { 874 return _idnum_allocated_count++; 875 } 876 } 877 878 879 /* JNIid class for jfieldIDs only */ 880 class JNIid: public CHeapObj { 881 friend class VMStructs; 882 private: 883 klassOop _holder; 884 JNIid* _next; 885 int _offset; 886 #ifdef ASSERT 887 bool _is_static_field_id; 888 #endif 889 890 public: 891 // Accessors 892 klassOop holder() const { return _holder; } 893 int offset() const { return _offset; } 894 JNIid* next() { return _next; } 895 // Constructor 896 JNIid(klassOop holder, int offset, JNIid* next); 897 // Identifier lookup 898 JNIid* find(int offset); 899 900 bool find_local_field(fieldDescriptor* fd) { 901 return instanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 902 } 903 904 // Garbage collection support 905 oop* holder_addr() { return (oop*)&_holder; } 906 void oops_do(OopClosure* f); 907 static void deallocate(JNIid* id); 908 // Debugging 909 #ifdef ASSERT 910 bool is_static_field_id() const { return _is_static_field_id; } 911 void set_is_static_field_id() { _is_static_field_id = true; } 912 #endif 913 void verify(klassOop holder); 914 }; 915 916 917 // If breakpoints are more numerous than just JVMTI breakpoints, 918 // consider compressing this data structure. 919 // It is currently a simple linked list defined in methodOop.hpp. 920 921 class BreakpointInfo; 922 923 924 // A collection point for interesting information about the previous 925 // version(s) of an instanceKlass. This class uses weak references to 926 // the information so that the information may be collected as needed 927 // by the system. If the information is shared, then a regular 928 // reference must be used because a weak reference would be seen as 929 // collectible. A GrowableArray of PreviousVersionNodes is attached 930 // to the instanceKlass as needed. See PreviousVersionWalker below. 931 class PreviousVersionNode : public CHeapObj { 932 private: 933 // A shared ConstantPool is never collected so we'll always have 934 // a reference to it so we can update items in the cache. We'll 935 // have a weak reference to a non-shared ConstantPool until all 936 // of the methods (EMCP or obsolete) have been collected; the 937 // non-shared ConstantPool becomes collectible at that point. 938 jobject _prev_constant_pool; // regular or weak reference 939 bool _prev_cp_is_weak; // true if not a shared ConstantPool 940 941 // If the previous version of the instanceKlass doesn't have any 942 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the 943 // EMCP methods have been collected, then _prev_EMCP_methods can 944 // have a length of zero. 945 GrowableArray<jweak>* _prev_EMCP_methods; 946 947 public: 948 PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak, 949 GrowableArray<jweak>* prev_EMCP_methods); 950 ~PreviousVersionNode(); 951 jobject prev_constant_pool() const { 952 return _prev_constant_pool; 953 } 954 GrowableArray<jweak>* prev_EMCP_methods() const { 955 return _prev_EMCP_methods; 956 } 957 }; 958 959 960 // A Handle-ized version of PreviousVersionNode. 961 class PreviousVersionInfo : public ResourceObj { 962 private: 963 constantPoolHandle _prev_constant_pool_handle; 964 // If the previous version of the instanceKlass doesn't have any 965 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the 966 // methods cannot be collected while we hold a handle, 967 // _prev_EMCP_methods should never have a length of zero. 968 GrowableArray<methodHandle>* _prev_EMCP_method_handles; 969 970 public: 971 PreviousVersionInfo(PreviousVersionNode *pv_node); 972 ~PreviousVersionInfo(); 973 constantPoolHandle prev_constant_pool_handle() const { 974 return _prev_constant_pool_handle; 975 } 976 GrowableArray<methodHandle>* prev_EMCP_method_handles() const { 977 return _prev_EMCP_method_handles; 978 } 979 }; 980 981 982 // Helper object for walking previous versions. This helper cleans up 983 // the Handles that it allocates when the helper object is destroyed. 984 // The PreviousVersionInfo object returned by next_previous_version() 985 // is only valid until a subsequent call to next_previous_version() or 986 // the helper object is destroyed. 987 class PreviousVersionWalker : public StackObj { 988 private: 989 GrowableArray<PreviousVersionNode *>* _previous_versions; 990 int _current_index; 991 // Fields for cleaning up when we are done walking the previous versions: 992 // A HandleMark for the PreviousVersionInfo handles: 993 HandleMark _hm; 994 995 // It would be nice to have a ResourceMark field in this helper also, 996 // but the ResourceMark code says to be careful to delete handles held 997 // in GrowableArrays _before_ deleting the GrowableArray. Since we 998 // can't guarantee the order in which the fields are destroyed, we 999 // have to let the creator of the PreviousVersionWalker object do 1000 // the right thing. Also, adding a ResourceMark here causes an 1001 // include loop. 1002 1003 // A pointer to the current info object so we can handle the deletes. 1004 PreviousVersionInfo * _current_p; 1005 1006 public: 1007 PreviousVersionWalker(instanceKlass *ik); 1008 ~PreviousVersionWalker(); 1009 1010 // Return the interesting information for the next previous version 1011 // of the klass. Returns NULL if there are no more previous versions. 1012 PreviousVersionInfo* next_previous_version(); 1013 }; 1014 1015 1016 // 1017 // nmethodBucket is used to record dependent nmethods for 1018 // deoptimization. nmethod dependencies are actually <klass, method> 1019 // pairs but we really only care about the klass part for purposes of 1020 // finding nmethods which might need to be deoptimized. Instead of 1021 // recording the method, a count of how many times a particular nmethod 1022 // was recorded is kept. This ensures that any recording errors are 1023 // noticed since an nmethod should be removed as many times are it's 1024 // added. 1025 // 1026 class nmethodBucket: public CHeapObj { 1027 friend class VMStructs; 1028 private: 1029 nmethod* _nmethod; 1030 int _count; 1031 nmethodBucket* _next; 1032 1033 public: 1034 nmethodBucket(nmethod* nmethod, nmethodBucket* next) { 1035 _nmethod = nmethod; 1036 _next = next; 1037 _count = 1; 1038 } 1039 int count() { return _count; } 1040 int increment() { _count += 1; return _count; } 1041 int decrement() { _count -= 1; assert(_count >= 0, "don't underflow"); return _count; } 1042 nmethodBucket* next() { return _next; } 1043 void set_next(nmethodBucket* b) { _next = b; } 1044 nmethod* get_nmethod() { return _nmethod; } 1045 }; 1046 1047 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP