1 /* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_OOPS_INSTANCEKLASS_HPP 26 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP 27 28 #include "classfile/classLoaderData.hpp" 29 #include "gc/shared/specialized_oop_closures.hpp" 30 #include "memory/referenceType.hpp" 31 #include "oops/annotations.hpp" 32 #include "oops/constMethod.hpp" 33 #include "oops/fieldInfo.hpp" 34 #include "oops/instanceOop.hpp" 35 #include "oops/klassVtable.hpp" 36 #include "runtime/handles.hpp" 37 #include "runtime/os.hpp" 38 #include "trace/traceMacros.hpp" 39 #include "utilities/accessFlags.hpp" 40 #include "utilities/bitMap.inline.hpp" 41 #include "utilities/macros.hpp" 42 43 // An InstanceKlass is the VM level representation of a Java class. 44 // It contains all information needed for at class at execution runtime. 45 46 // InstanceKlass embedded field layout (after declared fields): 47 // [EMBEDDED Java vtable ] size in words = vtable_len 48 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size 49 // The embedded nonstatic oop-map blocks are short pairs (offset, length) 50 // indicating where oops are located in instances of this klass. 51 // [EMBEDDED implementor of the interface] only exist for interface 52 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled) 53 54 55 // forward declaration for class -- see below for definition 56 class SuperTypeClosure; 57 class JNIid; 58 class jniIdMapBase; 59 class BreakpointInfo; 60 class fieldDescriptor; 61 class DepChange; 62 class nmethodBucket; 63 class JvmtiCachedClassFieldMap; 64 class MemberNameTable; 65 66 // This is used in iterators below. 67 class FieldClosure: public StackObj { 68 public: 69 virtual void do_field(fieldDescriptor* fd) = 0; 70 }; 71 72 #ifndef PRODUCT 73 // Print fields. 74 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. 75 class FieldPrinter: public FieldClosure { 76 oop _obj; 77 outputStream* _st; 78 public: 79 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} 80 void do_field(fieldDescriptor* fd); 81 }; 82 #endif // !PRODUCT 83 84 // ValueObjs embedded in klass. Describes where oops are located in instances of 85 // this klass. 86 class OopMapBlock VALUE_OBJ_CLASS_SPEC { 87 public: 88 // Byte offset of the first oop mapped by this block. 89 int offset() const { return _offset; } 90 void set_offset(int offset) { _offset = offset; } 91 92 // Number of oops in this block. 93 uint count() const { return _count; } 94 void set_count(uint count) { _count = count; } 95 96 // sizeof(OopMapBlock) in HeapWords. 97 static const int size_in_words() { 98 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >> 99 LogHeapWordSize; 100 } 101 102 private: 103 int _offset; 104 uint _count; 105 }; 106 107 struct JvmtiCachedClassFileData; 108 109 class InstanceKlass: public Klass { 110 friend class VMStructs; 111 friend class ClassFileParser; 112 friend class CompileReplay; 113 114 protected: 115 // Constructor 116 InstanceKlass(int vtable_len, 117 int itable_len, 118 int static_field_size, 119 int nonstatic_oop_map_size, 120 unsigned kind, 121 ReferenceType rt, 122 AccessFlags access_flags, 123 bool is_anonymous); 124 public: 125 static InstanceKlass* allocate_instance_klass( 126 ClassLoaderData* loader_data, 127 int vtable_len, 128 int itable_len, 129 int static_field_size, 130 int nonstatic_oop_map_size, 131 ReferenceType rt, 132 AccessFlags access_flags, 133 Symbol* name, 134 Klass* super_klass, 135 bool is_anonymous, 136 TRAPS); 137 138 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } 139 140 // 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 allocated, // allocated (but not yet linked) 144 loaded, // loaded and inserted in class hierarchy (but not linked yet) 145 linked, // successfully linked/verified (but not initialized yet) 146 being_initialized, // currently running class initializer 147 fully_initialized, // initialized (successfull final state) 148 initialization_error // error happened during initialization 149 }; 150 151 static int number_of_instance_classes() { return _total_instanceKlass_count; } 152 153 private: 154 static volatile int _total_instanceKlass_count; 155 156 protected: 157 // Annotations for this class 158 Annotations* _annotations; 159 // Array classes holding elements of this class. 160 Klass* _array_klasses; 161 // Constant pool for this class. 162 ConstantPool* _constants; 163 // The InnerClasses attribute and EnclosingMethod attribute. The 164 // _inner_classes is an array of shorts. If the class has InnerClasses 165 // attribute, then the _inner_classes array begins with 4-tuples of shorts 166 // [inner_class_info_index, outer_class_info_index, 167 // inner_name_index, inner_class_access_flags] for the InnerClasses 168 // attribute. If the EnclosingMethod attribute exists, it occupies the 169 // last two shorts [class_index, method_index] of the array. If only 170 // the InnerClasses attribute exists, the _inner_classes array length is 171 // number_of_inner_classes * 4. If the class has both InnerClasses 172 // and EnclosingMethod attributes the _inner_classes array length is 173 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 174 Array<jushort>* _inner_classes; 175 176 // the source debug extension for this klass, NULL if not specified. 177 // Specified as UTF-8 string without terminating zero byte in the classfile, 178 // it is stored in the instanceklass as a NULL-terminated UTF-8 string 179 char* _source_debug_extension; 180 // Array name derived from this class which needs unreferencing 181 // if this class is unloaded. 182 Symbol* _array_name; 183 184 // Number of heapOopSize words used by non-static fields in this klass 185 // (including inherited fields but after header_size()). 186 int _nonstatic_field_size; 187 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 188 // Constant pool index to the utf8 entry of the Generic signature, 189 // or 0 if none. 190 u2 _generic_signature_index; 191 // Constant pool index to the utf8 entry for the name of source file 192 // containing this klass, 0 if not specified. 193 u2 _source_file_name_index; 194 u2 _static_oop_field_count;// number of static oop fields in this klass 195 u2 _java_fields_count; // The number of declared Java fields 196 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 197 198 // _is_marked_dependent can be set concurrently, thus cannot be part of the 199 // _misc_flags. 200 bool _is_marked_dependent; // used for marking during flushing and deoptimization 201 bool _has_unloaded_dependent; 202 203 // The low two bits of _misc_flags contains the kind field. 204 // This can be used to quickly discriminate among the four kinds of 205 // InstanceKlass. 206 207 static const unsigned _misc_kind_field_size = 2; 208 static const unsigned _misc_kind_field_pos = 0; 209 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u; 210 211 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass 212 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass 213 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass 214 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass 215 216 // Start after _misc_kind field. 217 enum { 218 _misc_rewritten = 1 << 2, // methods rewritten. 219 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops 220 _misc_should_verify_class = 1 << 4, // allow caching of preverification 221 _misc_is_anonymous = 1 << 5, // has embedded _host_klass field 222 _misc_is_contended = 1 << 6, // marked with contended annotation 223 _misc_has_default_methods = 1 << 7, // class/superclass/implemented interfaces has default methods 224 _misc_declares_default_methods = 1 << 8, // directly declares default methods (any access) 225 _misc_has_been_redefined = 1 << 9, // class has been redefined 226 _misc_is_scratch_class = 1 << 10 // class is the redefined scratch class 227 }; 228 u2 _misc_flags; 229 u2 _minor_version; // minor version number of class file 230 u2 _major_version; // major version number of class file 231 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) 232 int _vtable_len; // length of Java vtable (in words) 233 int _itable_len; // length of Java itable (in words) 234 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 235 MemberNameTable* _member_names; // Member names 236 JNIid* _jni_ids; // First JNI identifier for static fields in this class 237 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 238 nmethodBucket* _dependencies; // list of dependent nmethods 239 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 240 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 241 // Linked instanceKlasses of previous versions 242 InstanceKlass* _previous_versions; 243 // JVMTI fields can be moved to their own structure - see 6315920 244 // JVMTI: cached class file, before retransformable agent modified it in CFLH 245 JvmtiCachedClassFileData* _cached_class_file; 246 247 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 248 249 // Class states are defined as ClassState (see above). 250 // Place the _init_state here to utilize the unused 2-byte after 251 // _idnum_allocated_count. 252 u1 _init_state; // state of class 253 u1 _reference_type; // reference type 254 255 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 256 257 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 258 259 // Method array. 260 Array<Method*>* _methods; 261 // Default Method Array, concrete methods inherited from interfaces 262 Array<Method*>* _default_methods; 263 // Interface (Klass*s) this class declares locally to implement. 264 Array<Klass*>* _local_interfaces; 265 // Interface (Klass*s) this class implements transitively. 266 Array<Klass*>* _transitive_interfaces; 267 // Int array containing the original order of method in the class file (for JVMTI). 268 Array<int>* _method_ordering; 269 // Int array containing the vtable_indices for default_methods 270 // offset matches _default_methods offset 271 Array<int>* _default_vtable_indices; 272 273 // Instance and static variable information, starts with 6-tuples of shorts 274 // [access, name index, sig index, initval index, low_offset, high_offset] 275 // for all fields, followed by the generic signature data at the end of 276 // the array. Only fields with generic signature attributes have the generic 277 // signature data set in the array. The fields array looks like following: 278 // 279 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 280 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 281 // ... 282 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 283 // [generic signature index] 284 // [generic signature index] 285 // ... 286 Array<u2>* _fields; 287 288 // embedded Java vtable follows here 289 // embedded Java itables follows here 290 // embedded static fields follows here 291 // embedded nonstatic oop-map blocks follows here 292 // embedded implementor of this interface follows here 293 // The embedded implementor only exists if the current klass is an 294 // iterface. The possible values of the implementor fall into following 295 // three cases: 296 // NULL: no implementor. 297 // A Klass* that's not itself: one implementor. 298 // Itself: more than one implementors. 299 // embedded host klass follows here 300 // The embedded host klass only exists in an anonymous class for 301 // dynamic language support (JSR 292 enabled). The host class grants 302 // its access privileges to this class also. The host class is either 303 // named, or a previously loaded anonymous class. A non-anonymous class 304 // or an anonymous class loaded through normal classloading does not 305 // have this embedded field. 306 // 307 308 friend class SystemDictionary; 309 310 public: 311 bool has_nonstatic_fields() const { 312 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 313 } 314 void set_has_nonstatic_fields(bool b) { 315 if (b) { 316 _misc_flags |= _misc_has_nonstatic_fields; 317 } else { 318 _misc_flags &= ~_misc_has_nonstatic_fields; 319 } 320 } 321 322 // field sizes 323 int nonstatic_field_size() const { return _nonstatic_field_size; } 324 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 325 326 int static_field_size() const { return _static_field_size; } 327 void set_static_field_size(int size) { _static_field_size = size; } 328 329 int static_oop_field_count() const { return (int)_static_oop_field_count; } 330 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 331 332 // Java vtable 333 int vtable_length() const { return _vtable_len; } 334 void set_vtable_length(int len) { _vtable_len = len; } 335 336 // Java itable 337 int itable_length() const { return _itable_len; } 338 void set_itable_length(int len) { _itable_len = len; } 339 340 // array klasses 341 Klass* array_klasses() const { return _array_klasses; } 342 void set_array_klasses(Klass* k) { _array_klasses = k; } 343 344 // methods 345 Array<Method*>* methods() const { return _methods; } 346 void set_methods(Array<Method*>* a) { _methods = a; } 347 Method* method_with_idnum(int idnum); 348 Method* method_with_orig_idnum(int idnum); 349 Method* method_with_orig_idnum(int idnum, int version); 350 351 // method ordering 352 Array<int>* method_ordering() const { return _method_ordering; } 353 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 354 void copy_method_ordering(intArray* m, TRAPS); 355 356 // default_methods 357 Array<Method*>* default_methods() const { return _default_methods; } 358 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 359 360 // default method vtable_indices 361 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 362 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 363 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 364 365 // interfaces 366 Array<Klass*>* local_interfaces() const { return _local_interfaces; } 367 void set_local_interfaces(Array<Klass*>* a) { 368 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 369 _local_interfaces = a; } 370 371 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; } 372 void set_transitive_interfaces(Array<Klass*>* a) { 373 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 374 _transitive_interfaces = a; 375 } 376 377 private: 378 friend class fieldDescriptor; 379 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 380 381 public: 382 int field_offset (int index) const { return field(index)->offset(); } 383 int field_access_flags(int index) const { return field(index)->access_flags(); } 384 Symbol* field_name (int index) const { return field(index)->name(constants()); } 385 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 386 387 // Number of Java declared fields 388 int java_fields_count() const { return (int)_java_fields_count; } 389 390 Array<u2>* fields() const { return _fields; } 391 void set_fields(Array<u2>* f, u2 java_fields_count) { 392 guarantee(_fields == NULL || f == NULL, "Just checking"); 393 _fields = f; 394 _java_fields_count = java_fields_count; 395 } 396 397 // inner classes 398 Array<u2>* inner_classes() const { return _inner_classes; } 399 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 400 401 enum InnerClassAttributeOffset { 402 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 403 inner_class_inner_class_info_offset = 0, 404 inner_class_outer_class_info_offset = 1, 405 inner_class_inner_name_offset = 2, 406 inner_class_access_flags_offset = 3, 407 inner_class_next_offset = 4 408 }; 409 410 enum EnclosingMethodAttributeOffset { 411 enclosing_method_class_index_offset = 0, 412 enclosing_method_method_index_offset = 1, 413 enclosing_method_attribute_size = 2 414 }; 415 416 // method override check 417 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 418 419 // package 420 bool is_same_class_package(Klass* class2); 421 bool is_same_class_package(oop classloader2, Symbol* classname2); 422 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2); 423 424 // find an enclosing class 425 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) { 426 instanceKlassHandle self(THREAD, this); 427 return compute_enclosing_class_impl(self, inner_is_member, THREAD); 428 } 429 static Klass* compute_enclosing_class_impl(instanceKlassHandle self, 430 bool* inner_is_member, TRAPS); 431 432 // Find InnerClasses attribute for k and return outer_class_info_index & inner_name_index. 433 static bool find_inner_classes_attr(instanceKlassHandle k, 434 int* ooff, int* noff, TRAPS); 435 436 // tell if two classes have the same enclosing class (at package level) 437 bool is_same_package_member(Klass* class2, TRAPS) { 438 instanceKlassHandle self(THREAD, this); 439 return is_same_package_member_impl(self, class2, THREAD); 440 } 441 static bool is_same_package_member_impl(instanceKlassHandle self, 442 Klass* class2, TRAPS); 443 444 // initialization state 445 bool is_loaded() const { return _init_state >= loaded; } 446 bool is_linked() const { return _init_state >= linked; } 447 bool is_initialized() const { return _init_state == fully_initialized; } 448 bool is_not_initialized() const { return _init_state < being_initialized; } 449 bool is_being_initialized() const { return _init_state == being_initialized; } 450 bool is_in_error_state() const { return _init_state == initialization_error; } 451 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 452 ClassState init_state() { return (ClassState)_init_state; } 453 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 454 455 // defineClass specified verification 456 bool should_verify_class() const { 457 return (_misc_flags & _misc_should_verify_class) != 0; 458 } 459 void set_should_verify_class(bool value) { 460 if (value) { 461 _misc_flags |= _misc_should_verify_class; 462 } else { 463 _misc_flags &= ~_misc_should_verify_class; 464 } 465 } 466 467 // marking 468 bool is_marked_dependent() const { return _is_marked_dependent; } 469 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 470 471 bool has_unloaded_dependent() const { return _has_unloaded_dependent; } 472 void set_has_unloaded_dependent(bool value) { _has_unloaded_dependent = value; } 473 474 // initialization (virtuals from Klass) 475 bool should_be_initialized() const; // means that initialize should be called 476 void initialize(TRAPS); 477 void link_class(TRAPS); 478 bool link_class_or_fail(TRAPS); // returns false on failure 479 void unlink_class(); 480 void rewrite_class(TRAPS); 481 void link_methods(TRAPS); 482 Method* class_initializer(); 483 484 // set the class to initialized if no static initializer is present 485 void eager_initialize(Thread *thread); 486 487 // reference type 488 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 489 void set_reference_type(ReferenceType t) { 490 assert(t == (u1)t, "overflow"); 491 _reference_type = (u1)t; 492 } 493 494 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 495 496 // find local field, returns true if found 497 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 498 // find field in direct superinterfaces, returns the interface in which the field is defined 499 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 500 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 501 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 502 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 503 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 504 505 // find a non-static or static field given its offset within the class. 506 bool contains_field_offset(int offset) { 507 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); 508 } 509 510 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 511 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 512 513 // find a local method (returns NULL if not found) 514 Method* find_method(Symbol* name, Symbol* signature) const; 515 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature); 516 517 // find a local method, but skip static methods 518 Method* find_instance_method(Symbol* name, Symbol* signature); 519 static Method* find_instance_method(Array<Method*>* methods, Symbol* name, Symbol* signature); 520 521 // find a local method (returns NULL if not found) 522 Method* find_local_method(Symbol* name, Symbol* signature, 523 OverpassLookupMode overpass_mode, 524 StaticLookupMode static_mode, 525 PrivateLookupMode private_mode) const; 526 527 // find a local method from given methods array (returns NULL if not found) 528 static Method* find_local_method(Array<Method*>* methods, 529 Symbol* name, Symbol* signature, 530 OverpassLookupMode overpass_mode, 531 StaticLookupMode static_mode, 532 PrivateLookupMode private_mode); 533 534 // true if method matches signature and conforms to skipping_X conditions. 535 static bool method_matches(Method* m, Symbol* signature, bool skipping_overpass, bool skipping_static, bool skipping_private); 536 537 // find a local method index in methods or default_methods (returns -1 if not found) 538 static int find_method_index(Array<Method*>* methods, 539 Symbol* name, Symbol* signature, 540 OverpassLookupMode overpass_mode, 541 StaticLookupMode static_mode, 542 PrivateLookupMode private_mode); 543 544 // lookup operation (returns NULL if not found) 545 Method* uncached_lookup_method(Symbol* name, Symbol* signature, OverpassLookupMode overpass_mode) const; 546 547 // lookup a method in all the interfaces that this class implements 548 // (returns NULL if not found) 549 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 550 551 // lookup a method in local defaults then in all interfaces 552 // (returns NULL if not found) 553 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 554 555 // Find method indices by name. If a method with the specified name is 556 // found the index to the first method is returned, and 'end' is filled in 557 // with the index of first non-name-matching method. If no method is found 558 // -1 is returned. 559 int find_method_by_name(Symbol* name, int* end); 560 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end); 561 562 // constant pool 563 ConstantPool* constants() const { return _constants; } 564 void set_constants(ConstantPool* c) { _constants = c; } 565 566 // protection domain 567 oop protection_domain() const; 568 569 // signers 570 objArrayOop signers() const; 571 572 // host class 573 Klass* host_klass() const { 574 Klass** hk = (Klass**)adr_host_klass(); 575 if (hk == NULL) { 576 return NULL; 577 } else { 578 assert(*hk != NULL, "host klass should always be set if the address is not null"); 579 return *hk; 580 } 581 } 582 void set_host_klass(Klass* host) { 583 assert(is_anonymous(), "not anonymous"); 584 Klass** addr = (Klass**)adr_host_klass(); 585 assert(addr != NULL, "no reversed space"); 586 if (addr != NULL) { 587 *addr = host; 588 } 589 } 590 bool is_anonymous() const { 591 return (_misc_flags & _misc_is_anonymous) != 0; 592 } 593 void set_is_anonymous(bool value) { 594 if (value) { 595 _misc_flags |= _misc_is_anonymous; 596 } else { 597 _misc_flags &= ~_misc_is_anonymous; 598 } 599 } 600 601 // Oop that keeps the metadata for this class from being unloaded 602 // in places where the metadata is stored in other places, like nmethods 603 oop klass_holder() const { 604 return is_anonymous() ? java_mirror() : class_loader(); 605 } 606 607 bool is_contended() const { 608 return (_misc_flags & _misc_is_contended) != 0; 609 } 610 void set_is_contended(bool value) { 611 if (value) { 612 _misc_flags |= _misc_is_contended; 613 } else { 614 _misc_flags &= ~_misc_is_contended; 615 } 616 } 617 618 // source file name 619 Symbol* source_file_name() const { 620 return (_source_file_name_index == 0) ? 621 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index); 622 } 623 u2 source_file_name_index() const { 624 return _source_file_name_index; 625 } 626 void set_source_file_name_index(u2 sourcefile_index) { 627 _source_file_name_index = sourcefile_index; 628 } 629 630 // minor and major version numbers of class file 631 u2 minor_version() const { return _minor_version; } 632 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 633 u2 major_version() const { return _major_version; } 634 void set_major_version(u2 major_version) { _major_version = major_version; } 635 636 // source debug extension 637 char* source_debug_extension() const { return _source_debug_extension; } 638 void set_source_debug_extension(char* array, int length); 639 640 // symbol unloading support (refcount already added) 641 Symbol* array_name() { return _array_name; } 642 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; } 643 644 // nonstatic oop-map blocks 645 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 646 return oop_map_count * OopMapBlock::size_in_words(); 647 } 648 unsigned int nonstatic_oop_map_count() const { 649 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 650 } 651 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 652 void set_nonstatic_oop_map_size(int words) { 653 _nonstatic_oop_map_size = words; 654 } 655 656 // RedefineClasses() support for previous versions: 657 void add_previous_version(instanceKlassHandle ikh, int emcp_method_count); 658 659 InstanceKlass* previous_versions() const { return _previous_versions; } 660 661 InstanceKlass* get_klass_version(int version) { 662 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 663 if (ik->constants()->version() == version) { 664 return ik; 665 } 666 } 667 return NULL; 668 } 669 670 bool has_been_redefined() const { 671 return (_misc_flags & _misc_has_been_redefined) != 0; 672 } 673 void set_has_been_redefined() { 674 _misc_flags |= _misc_has_been_redefined; 675 } 676 677 bool is_scratch_class() const { 678 return (_misc_flags & _misc_is_scratch_class) != 0; 679 } 680 681 void set_is_scratch_class() { 682 _misc_flags |= _misc_is_scratch_class; 683 } 684 685 private: 686 687 void set_kind(unsigned kind) { 688 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind"); 689 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos; 690 unsigned flags = _misc_flags & ~fmask; 691 _misc_flags = (flags | (kind << _misc_kind_field_pos)); 692 } 693 694 bool is_kind(unsigned desired) const { 695 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask; 696 return kind == desired; 697 } 698 699 public: 700 701 // Other is anything that is not one of the more specialized kinds of InstanceKlass. 702 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); } 703 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); } 704 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); } 705 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); } 706 707 void init_previous_versions() { 708 _previous_versions = NULL; 709 } 710 711 private: 712 static int _previous_version_count; 713 public: 714 static void purge_previous_versions(InstanceKlass* ik); 715 static bool has_previous_versions() { return _previous_version_count > 0; } 716 717 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 718 void set_cached_class_file(JvmtiCachedClassFileData *data) { 719 _cached_class_file = data; 720 } 721 JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; } 722 jint get_cached_class_file_len(); 723 unsigned char * get_cached_class_file_bytes(); 724 725 // JVMTI: Support for caching of field indices, types, and offsets 726 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 727 _jvmti_cached_class_field_map = descriptor; 728 } 729 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 730 return _jvmti_cached_class_field_map; 731 } 732 733 bool has_default_methods() const { 734 return (_misc_flags & _misc_has_default_methods) != 0; 735 } 736 void set_has_default_methods(bool b) { 737 if (b) { 738 _misc_flags |= _misc_has_default_methods; 739 } else { 740 _misc_flags &= ~_misc_has_default_methods; 741 } 742 } 743 744 bool declares_default_methods() const { 745 return (_misc_flags & _misc_declares_default_methods) != 0; 746 } 747 void set_declares_default_methods(bool b) { 748 if (b) { 749 _misc_flags |= _misc_declares_default_methods; 750 } else { 751 _misc_flags &= ~_misc_declares_default_methods; 752 } 753 } 754 755 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 756 inline u2 next_method_idnum(); 757 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 758 759 // generics support 760 Symbol* generic_signature() const { 761 return (_generic_signature_index == 0) ? 762 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index); 763 } 764 u2 generic_signature_index() const { 765 return _generic_signature_index; 766 } 767 void set_generic_signature_index(u2 sig_index) { 768 _generic_signature_index = sig_index; 769 } 770 771 u2 enclosing_method_data(int offset); 772 u2 enclosing_method_class_index() { 773 return enclosing_method_data(enclosing_method_class_index_offset); 774 } 775 u2 enclosing_method_method_index() { 776 return enclosing_method_data(enclosing_method_method_index_offset); 777 } 778 void set_enclosing_method_indices(u2 class_index, 779 u2 method_index); 780 781 // jmethodID support 782 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, 783 methodHandle method_h); 784 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h, 785 size_t idnum, jmethodID new_id, jmethodID* new_jmeths, 786 jmethodID* to_dealloc_id_p, 787 jmethodID** to_dealloc_jmeths_p); 788 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 789 size_t *length_p, jmethodID* id_p); 790 void ensure_space_for_methodids(int start_offset = 0); 791 jmethodID jmethod_id_or_null(Method* method); 792 793 // annotations support 794 Annotations* annotations() const { return _annotations; } 795 void set_annotations(Annotations* anno) { _annotations = anno; } 796 797 AnnotationArray* class_annotations() const { 798 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 799 } 800 Array<AnnotationArray*>* fields_annotations() const { 801 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 802 } 803 AnnotationArray* class_type_annotations() const { 804 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 805 } 806 Array<AnnotationArray*>* fields_type_annotations() const { 807 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 808 } 809 // allocation 810 instanceOop allocate_instance(TRAPS); 811 812 // additional member function to return a handle 813 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } 814 815 objArrayOop allocate_objArray(int n, int length, TRAPS); 816 // Helper function 817 static instanceOop register_finalizer(instanceOop i, TRAPS); 818 819 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 820 // if not, throw either an Error or an Exception. 821 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 822 823 // initialization 824 void call_class_initializer(TRAPS); 825 void set_initialization_state_and_notify(ClassState state, TRAPS); 826 827 // OopMapCache support 828 OopMapCache* oop_map_cache() { return _oop_map_cache; } 829 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 830 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry); 831 832 // JNI identifier support (for static fields - for jni performance) 833 JNIid* jni_ids() { return _jni_ids; } 834 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 835 JNIid* jni_id_for(int offset); 836 837 // maintenance of deoptimization dependencies 838 int mark_dependent_nmethods(DepChange& changes); 839 void add_dependent_nmethod(nmethod* nm); 840 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately); 841 842 // On-stack replacement support 843 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 844 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 845 void add_osr_nmethod(nmethod* n); 846 void remove_osr_nmethod(nmethod* n); 847 int mark_osr_nmethods(const Method* m); 848 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 849 850 // Breakpoint support (see methods on Method* for details) 851 BreakpointInfo* breakpoints() const { return _breakpoints; }; 852 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 853 854 // support for stub routines 855 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 856 TRACE_DEFINE_OFFSET; 857 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 858 859 // subclass/subinterface checks 860 bool implements_interface(Klass* k) const; 861 bool is_same_or_direct_interface(Klass* k) const; 862 863 #ifdef ASSERT 864 // check whether this class or one of its superclasses was redefined 865 bool has_redefined_this_or_super() const; 866 #endif 867 868 // Access to the implementor of an interface. 869 Klass* implementor() const 870 { 871 Klass** k = adr_implementor(); 872 if (k == NULL) { 873 return NULL; 874 } else { 875 return *k; 876 } 877 } 878 879 void set_implementor(Klass* k) { 880 assert(is_interface(), "not interface"); 881 Klass** addr = adr_implementor(); 882 assert(addr != NULL, "null addr"); 883 if (addr != NULL) { 884 *addr = k; 885 } 886 } 887 888 int nof_implementors() const { 889 Klass* k = implementor(); 890 if (k == NULL) { 891 return 0; 892 } else if (k != this) { 893 return 1; 894 } else { 895 return 2; 896 } 897 } 898 899 void add_implementor(Klass* k); // k is a new class that implements this interface 900 void init_implementor(); // initialize 901 902 // link this class into the implementors list of every interface it implements 903 void process_interfaces(Thread *thread); 904 905 // virtual operations from Klass 906 bool is_leaf_class() const { return _subklass == NULL; } 907 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); 908 bool compute_is_subtype_of(Klass* k); 909 bool can_be_primary_super_slow() const; 910 int oop_size(oop obj) const { return size_helper(); } 911 bool oop_is_instance_slow() const { return true; } 912 913 // Iterators 914 void do_local_static_fields(FieldClosure* cl); 915 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 916 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 917 918 void methods_do(void f(Method* method)); 919 void array_klasses_do(void f(Klass* k)); 920 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 921 bool super_types_do(SuperTypeClosure* blk); 922 923 // Casting from Klass* 924 static InstanceKlass* cast(Klass* k) { 925 assert(k == NULL || k->oop_is_instance(), "cast to InstanceKlass"); 926 return static_cast<InstanceKlass*>(k); 927 } 928 929 InstanceKlass* java_super() const { 930 return (super() == NULL) ? NULL : cast(super()); 931 } 932 933 // Sizing (in words) 934 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); } 935 936 static int size(int vtable_length, int itable_length, 937 int nonstatic_oop_map_size, 938 bool is_interface, bool is_anonymous) { 939 return align_object_size(header_size() + 940 align_object_offset(vtable_length) + 941 align_object_offset(itable_length) + 942 ((is_interface || is_anonymous) ? 943 align_object_offset(nonstatic_oop_map_size) : 944 nonstatic_oop_map_size) + 945 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) + 946 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0)); 947 } 948 int size() const { return size(vtable_length(), 949 itable_length(), 950 nonstatic_oop_map_size(), 951 is_interface(), 952 is_anonymous()); 953 } 954 #if INCLUDE_SERVICES 955 virtual void collect_statistics(KlassSizeStats *sz) const; 956 #endif 957 958 static int vtable_start_offset() { return header_size(); } 959 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; } 960 961 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); } 962 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); } 963 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 964 965 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 966 967 address static_field_addr(int offset); 968 969 OopMapBlock* start_of_nonstatic_oop_maps() const { 970 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length())); 971 } 972 973 Klass** end_of_nonstatic_oop_maps() const { 974 return (Klass**)(start_of_nonstatic_oop_maps() + 975 nonstatic_oop_map_count()); 976 } 977 978 Klass** adr_implementor() const { 979 if (is_interface()) { 980 return (Klass**)end_of_nonstatic_oop_maps(); 981 } else { 982 return NULL; 983 } 984 }; 985 986 Klass** adr_host_klass() const { 987 if (is_anonymous()) { 988 Klass** adr_impl = adr_implementor(); 989 if (adr_impl != NULL) { 990 return adr_impl + 1; 991 } else { 992 return end_of_nonstatic_oop_maps(); 993 } 994 } else { 995 return NULL; 996 } 997 } 998 999 // Use this to return the size of an instance in heap words: 1000 int size_helper() const { 1001 return layout_helper_to_size_helper(layout_helper()); 1002 } 1003 1004 // This bit is initialized in classFileParser.cpp. 1005 // It is false under any of the following conditions: 1006 // - the class is abstract (including any interface) 1007 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1008 // - the class size is larger than FastAllocateSizeLimit 1009 // - the class is java/lang/Class, which cannot be allocated directly 1010 bool can_be_fastpath_allocated() const { 1011 return !layout_helper_needs_slow_path(layout_helper()); 1012 } 1013 1014 // Java vtable/itable 1015 klassVtable* vtable() const; // return new klassVtable wrapper 1016 inline Method* method_at_vtable(int index); 1017 klassItable* itable() const; // return new klassItable wrapper 1018 Method* method_at_itable(Klass* holder, int index, TRAPS); 1019 1020 #if INCLUDE_JVMTI 1021 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed); 1022 #endif // INCLUDE_JVMTI 1023 1024 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive); 1025 void clean_implementors_list(BoolObjectClosure* is_alive); 1026 void clean_method_data(BoolObjectClosure* is_alive); 1027 void clean_dependent_nmethods(); 1028 1029 // Explicit metaspace deallocation of fields 1030 // For RedefineClasses and class file parsing errors, we need to deallocate 1031 // instanceKlasses and the metadata they point to. 1032 void deallocate_contents(ClassLoaderData* loader_data); 1033 static void deallocate_methods(ClassLoaderData* loader_data, 1034 Array<Method*>* methods); 1035 void static deallocate_interfaces(ClassLoaderData* loader_data, 1036 Klass* super_klass, 1037 Array<Klass*>* local_interfaces, 1038 Array<Klass*>* transitive_interfaces); 1039 1040 // The constant pool is on stack if any of the methods are executing or 1041 // referenced by handles. 1042 bool on_stack() const { return _constants->on_stack(); } 1043 1044 // callbacks for actions during class unloading 1045 static void notify_unload_class(InstanceKlass* ik); 1046 static void release_C_heap_structures(InstanceKlass* ik); 1047 1048 // Naming 1049 const char* signature_name() const; 1050 1051 // GC specific object visitors 1052 // 1053 // Mark Sweep 1054 int oop_ms_adjust_pointers(oop obj); 1055 #if INCLUDE_ALL_GCS 1056 // Parallel Scavenge 1057 void oop_ps_push_contents( oop obj, PSPromotionManager* pm); 1058 // Parallel Compact 1059 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm); 1060 void oop_pc_update_pointers(oop obj); 1061 #endif 1062 1063 // Oop fields (and metadata) iterators 1064 // [nv = true] Use non-virtual calls to do_oop_nv. 1065 // [nv = false] Use virtual calls to do_oop. 1066 // 1067 // The InstanceKlass iterators also visits the Object's klass. 1068 1069 // Forward iteration 1070 public: 1071 // Iterate over all oop fields in the oop maps. 1072 template <bool nv, class OopClosureType> 1073 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1074 1075 protected: 1076 // Iterate over all oop fields and metadata. 1077 template <bool nv, class OopClosureType> 1078 inline int oop_oop_iterate(oop obj, OopClosureType* closure); 1079 1080 private: 1081 // Iterate over all oop fields in the oop maps. 1082 // Specialized for [T = oop] or [T = narrowOop]. 1083 template <bool nv, typename T, class OopClosureType> 1084 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure); 1085 1086 // Iterate over all oop fields in one oop map. 1087 template <bool nv, typename T, class OopClosureType> 1088 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1089 1090 1091 // Reverse iteration 1092 #if INCLUDE_ALL_GCS 1093 public: 1094 // Iterate over all oop fields in the oop maps. 1095 template <bool nv, class OopClosureType> 1096 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1097 1098 protected: 1099 // Iterate over all oop fields and metadata. 1100 template <bool nv, class OopClosureType> 1101 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1102 1103 private: 1104 // Iterate over all oop fields in the oop maps. 1105 // Specialized for [T = oop] or [T = narrowOop]. 1106 template <bool nv, typename T, class OopClosureType> 1107 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure); 1108 1109 // Iterate over all oop fields in one oop map. 1110 template <bool nv, typename T, class OopClosureType> 1111 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1112 #endif 1113 1114 1115 // Bounded range iteration 1116 public: 1117 // Iterate over all oop fields in the oop maps. 1118 template <bool nv, class OopClosureType> 1119 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1120 1121 protected: 1122 // Iterate over all oop fields and metadata. 1123 template <bool nv, class OopClosureType> 1124 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1125 1126 private: 1127 // Iterate over all oop fields in the oop maps. 1128 // Specialized for [T = oop] or [T = narrowOop]. 1129 template <bool nv, typename T, class OopClosureType> 1130 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1131 1132 // Iterate over all oop fields in one oop map. 1133 template <bool nv, typename T, class OopClosureType> 1134 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1135 1136 1137 public: 1138 1139 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL) 1140 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL) 1141 1142 #if INCLUDE_ALL_GCS 1143 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS) 1144 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS) 1145 #endif // INCLUDE_ALL_GCS 1146 1147 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1148 1149 public: 1150 void set_in_error_state() { 1151 assert(DumpSharedSpaces, "only call this when dumping archive"); 1152 _init_state = initialization_error; 1153 } 1154 bool check_sharing_error_state(); 1155 1156 private: 1157 // initialization state 1158 #ifdef ASSERT 1159 void set_init_state(ClassState state); 1160 #else 1161 void set_init_state(ClassState state) { _init_state = (u1)state; } 1162 #endif 1163 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1164 void set_init_thread(Thread *thread) { _init_thread = thread; } 1165 1166 // The RedefineClasses() API can cause new method idnums to be needed 1167 // which will cause the caches to grow. Safety requires different 1168 // cache management logic if the caches can grow instead of just 1169 // going from NULL to non-NULL. 1170 bool idnum_can_increment() const { return has_been_redefined(); } 1171 jmethodID* methods_jmethod_ids_acquire() const 1172 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); } 1173 void release_set_methods_jmethod_ids(jmethodID* jmeths) 1174 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); } 1175 1176 // Lock during initialization 1177 public: 1178 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1179 // Must be one per class and it has to be a VM internal object so java code 1180 // cannot lock it (like the mirror). 1181 // It has to be an object not a Mutex because it's held through java calls. 1182 oop init_lock() const; 1183 private: 1184 void fence_and_clear_init_lock(); 1185 1186 // Static methods that are used to implement member methods where an exposed this pointer 1187 // is needed due to possible GCs 1188 static bool link_class_impl (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS); 1189 static bool verify_code (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS); 1190 static void initialize_impl (instanceKlassHandle this_k, TRAPS); 1191 static void initialize_super_interfaces (instanceKlassHandle this_k, TRAPS); 1192 static void eager_initialize_impl (instanceKlassHandle this_k); 1193 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_k, ClassState state, TRAPS); 1194 static void call_class_initializer_impl (instanceKlassHandle this_k, TRAPS); 1195 static Klass* array_klass_impl (instanceKlassHandle this_k, bool or_null, int n, TRAPS); 1196 static void do_local_static_fields_impl (instanceKlassHandle this_k, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS); 1197 /* jni_id_for_impl for jfieldID only */ 1198 static JNIid* jni_id_for_impl (instanceKlassHandle this_k, int offset); 1199 1200 // Returns the array class for the n'th dimension 1201 Klass* array_klass_impl(bool or_null, int n, TRAPS); 1202 1203 // Returns the array class with this class as element type 1204 Klass* array_klass_impl(bool or_null, TRAPS); 1205 1206 // find a local method (returns NULL if not found) 1207 Method* find_method_impl(Symbol* name, Symbol* signature, 1208 OverpassLookupMode overpass_mode, 1209 StaticLookupMode static_mode, 1210 PrivateLookupMode private_mode) const; 1211 static Method* find_method_impl(Array<Method*>* methods, 1212 Symbol* name, Symbol* signature, 1213 OverpassLookupMode overpass_mode, 1214 StaticLookupMode static_mode, 1215 PrivateLookupMode private_mode); 1216 1217 // Free CHeap allocated fields. 1218 void release_C_heap_structures(); 1219 1220 // RedefineClasses support 1221 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1222 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1223 public: 1224 // CDS support - remove and restore oops from metadata. Oops are not shared. 1225 virtual void remove_unshareable_info(); 1226 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 1227 1228 // jvm support 1229 jint compute_modifier_flags(TRAPS) const; 1230 1231 // JSR-292 support 1232 MemberNameTable* member_names() { return _member_names; } 1233 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; } 1234 bool add_member_name(Handle member_name); 1235 1236 public: 1237 // JVMTI support 1238 jint jvmti_class_status() const; 1239 1240 public: 1241 // Printing 1242 #ifndef PRODUCT 1243 void print_on(outputStream* st) const; 1244 #endif 1245 void print_value_on(outputStream* st) const; 1246 1247 void oop_print_value_on(oop obj, outputStream* st); 1248 1249 #ifndef PRODUCT 1250 void oop_print_on (oop obj, outputStream* st); 1251 1252 void print_dependent_nmethods(bool verbose = false); 1253 bool is_dependent_nmethod(nmethod* nm); 1254 #endif 1255 1256 const char* internal_name() const; 1257 1258 // Verification 1259 void verify_on(outputStream* st); 1260 1261 void oop_verify_on(oop obj, outputStream* st); 1262 }; 1263 1264 inline Method* InstanceKlass::method_at_vtable(int index) { 1265 #ifndef PRODUCT 1266 assert(index >= 0, "valid vtable index"); 1267 if (DebugVtables) { 1268 verify_vtable_index(index); 1269 } 1270 #endif 1271 vtableEntry* ve = (vtableEntry*)start_of_vtable(); 1272 return ve[index].method(); 1273 } 1274 1275 // for adding methods 1276 // UNSET_IDNUM return means no more ids available 1277 inline u2 InstanceKlass::next_method_idnum() { 1278 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1279 return ConstMethod::UNSET_IDNUM; // no more ids available 1280 } else { 1281 return _idnum_allocated_count++; 1282 } 1283 } 1284 1285 1286 /* JNIid class for jfieldIDs only */ 1287 class JNIid: public CHeapObj<mtClass> { 1288 friend class VMStructs; 1289 private: 1290 Klass* _holder; 1291 JNIid* _next; 1292 int _offset; 1293 #ifdef ASSERT 1294 bool _is_static_field_id; 1295 #endif 1296 1297 public: 1298 // Accessors 1299 Klass* holder() const { return _holder; } 1300 int offset() const { return _offset; } 1301 JNIid* next() { return _next; } 1302 // Constructor 1303 JNIid(Klass* holder, int offset, JNIid* next); 1304 // Identifier lookup 1305 JNIid* find(int offset); 1306 1307 bool find_local_field(fieldDescriptor* fd) { 1308 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1309 } 1310 1311 static void deallocate(JNIid* id); 1312 // Debugging 1313 #ifdef ASSERT 1314 bool is_static_field_id() const { return _is_static_field_id; } 1315 void set_is_static_field_id() { _is_static_field_id = true; } 1316 #endif 1317 void verify(Klass* holder); 1318 }; 1319 1320 1321 // 1322 // nmethodBucket is used to record dependent nmethods for 1323 // deoptimization. nmethod dependencies are actually <klass, method> 1324 // pairs but we really only care about the klass part for purposes of 1325 // finding nmethods which might need to be deoptimized. Instead of 1326 // recording the method, a count of how many times a particular nmethod 1327 // was recorded is kept. This ensures that any recording errors are 1328 // noticed since an nmethod should be removed as many times are it's 1329 // added. 1330 // 1331 class nmethodBucket: public CHeapObj<mtClass> { 1332 friend class VMStructs; 1333 private: 1334 nmethod* _nmethod; 1335 int _count; 1336 nmethodBucket* _next; 1337 1338 public: 1339 nmethodBucket(nmethod* nmethod, nmethodBucket* next) { 1340 _nmethod = nmethod; 1341 _next = next; 1342 _count = 1; 1343 } 1344 int count() { return _count; } 1345 int increment() { _count += 1; return _count; } 1346 int decrement(); 1347 nmethodBucket* next() { return _next; } 1348 void set_next(nmethodBucket* b) { _next = b; } 1349 nmethod* get_nmethod() { return _nmethod; } 1350 1351 static int mark_dependent_nmethods(nmethodBucket* deps, DepChange& changes); 1352 static nmethodBucket* add_dependent_nmethod(nmethodBucket* deps, nmethod* nm); 1353 static bool remove_dependent_nmethod(nmethodBucket** deps, nmethod* nm, bool delete_immediately); 1354 static bool remove_dependent_nmethod(nmethodBucket* deps, nmethod* nm); 1355 static nmethodBucket* clean_dependent_nmethods(nmethodBucket* deps); 1356 #ifndef PRODUCT 1357 static void print_dependent_nmethods(nmethodBucket* deps, bool verbose); 1358 static bool is_dependent_nmethod(nmethodBucket* deps, nmethod* nm); 1359 #endif //PRODUCT 1360 }; 1361 1362 // An iterator that's used to access the inner classes indices in the 1363 // InstanceKlass::_inner_classes array. 1364 class InnerClassesIterator : public StackObj { 1365 private: 1366 Array<jushort>* _inner_classes; 1367 int _length; 1368 int _idx; 1369 public: 1370 1371 InnerClassesIterator(instanceKlassHandle k) { 1372 _inner_classes = k->inner_classes(); 1373 if (k->inner_classes() != NULL) { 1374 _length = _inner_classes->length(); 1375 // The inner class array's length should be the multiple of 1376 // inner_class_next_offset if it only contains the InnerClasses 1377 // attribute data, or it should be 1378 // n*inner_class_next_offset+enclosing_method_attribute_size 1379 // if it also contains the EnclosingMethod data. 1380 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1381 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1382 "just checking"); 1383 // Remove the enclosing_method portion if exists. 1384 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1385 _length -= InstanceKlass::enclosing_method_attribute_size; 1386 } 1387 } else { 1388 _length = 0; 1389 } 1390 _idx = 0; 1391 } 1392 1393 int length() const { 1394 return _length; 1395 } 1396 1397 void next() { 1398 _idx += InstanceKlass::inner_class_next_offset; 1399 } 1400 1401 bool done() const { 1402 return (_idx >= _length); 1403 } 1404 1405 u2 inner_class_info_index() const { 1406 return _inner_classes->at( 1407 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1408 } 1409 1410 void set_inner_class_info_index(u2 index) { 1411 _inner_classes->at_put( 1412 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1413 } 1414 1415 u2 outer_class_info_index() const { 1416 return _inner_classes->at( 1417 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1418 } 1419 1420 void set_outer_class_info_index(u2 index) { 1421 _inner_classes->at_put( 1422 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1423 } 1424 1425 u2 inner_name_index() const { 1426 return _inner_classes->at( 1427 _idx + InstanceKlass::inner_class_inner_name_offset); 1428 } 1429 1430 void set_inner_name_index(u2 index) { 1431 _inner_classes->at_put( 1432 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1433 } 1434 1435 u2 inner_access_flags() const { 1436 return _inner_classes->at( 1437 _idx + InstanceKlass::inner_class_access_flags_offset); 1438 } 1439 }; 1440 1441 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP