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 BreakpointInfo; 57 class ClassFileParser; 58 class DepChange; 59 class DependencyContext; 60 class fieldDescriptor; 61 class jniIdMapBase; 62 class JNIid; 63 class JvmtiCachedClassFieldMap; 64 class MemberNameTable; 65 class SuperTypeClosure; 66 67 // This is used in iterators below. 68 class FieldClosure: public StackObj { 69 public: 70 virtual void do_field(fieldDescriptor* fd) = 0; 71 }; 72 73 #ifndef PRODUCT 74 // Print fields. 75 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. 76 class FieldPrinter: public FieldClosure { 77 oop _obj; 78 outputStream* _st; 79 public: 80 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} 81 void do_field(fieldDescriptor* fd); 82 }; 83 #endif // !PRODUCT 84 85 // ValueObjs embedded in klass. Describes where oops are located in instances of 86 // this klass. 87 class OopMapBlock VALUE_OBJ_CLASS_SPEC { 88 public: 89 // Byte offset of the first oop mapped by this block. 90 int offset() const { return _offset; } 91 void set_offset(int offset) { _offset = offset; } 92 93 // Number of oops in this block. 94 uint count() const { return _count; } 95 void set_count(uint count) { _count = count; } 96 97 // sizeof(OopMapBlock) in HeapWords. 98 static const int size_in_words() { 99 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >> 100 LogHeapWordSize; 101 } 102 103 private: 104 int _offset; 105 uint _count; 106 }; 107 108 struct JvmtiCachedClassFileData; 109 110 class InstanceKlass: public Klass { 111 friend class VMStructs; 112 friend class JVMCIVMStructs; 113 friend class ClassFileParser; 114 friend class CompileReplay; 115 116 protected: 117 InstanceKlass(const ClassFileParser& parser, unsigned kind); 118 119 public: 120 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } 121 122 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 123 // of the class loading & initialization procedure, and the use of the states. 124 enum ClassState { 125 allocated, // allocated (but not yet linked) 126 loaded, // loaded and inserted in class hierarchy (but not linked yet) 127 linked, // successfully linked/verified (but not initialized yet) 128 being_initialized, // currently running class initializer 129 fully_initialized, // initialized (successfull final state) 130 initialization_error // error happened during initialization 131 }; 132 133 static int number_of_instance_classes() { return _total_instanceKlass_count; } 134 135 private: 136 static volatile int _total_instanceKlass_count; 137 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS); 138 139 protected: 140 // Annotations for this class 141 Annotations* _annotations; 142 // Array classes holding elements of this class. 143 Klass* _array_klasses; 144 // Constant pool for this class. 145 ConstantPool* _constants; 146 // The InnerClasses attribute and EnclosingMethod attribute. The 147 // _inner_classes is an array of shorts. If the class has InnerClasses 148 // attribute, then the _inner_classes array begins with 4-tuples of shorts 149 // [inner_class_info_index, outer_class_info_index, 150 // inner_name_index, inner_class_access_flags] for the InnerClasses 151 // attribute. If the EnclosingMethod attribute exists, it occupies the 152 // last two shorts [class_index, method_index] of the array. If only 153 // the InnerClasses attribute exists, the _inner_classes array length is 154 // number_of_inner_classes * 4. If the class has both InnerClasses 155 // and EnclosingMethod attributes the _inner_classes array length is 156 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 157 Array<jushort>* _inner_classes; 158 159 // the source debug extension for this klass, NULL if not specified. 160 // Specified as UTF-8 string without terminating zero byte in the classfile, 161 // it is stored in the instanceklass as a NULL-terminated UTF-8 string 162 const char* _source_debug_extension; 163 // Array name derived from this class which needs unreferencing 164 // if this class is unloaded. 165 Symbol* _array_name; 166 167 // Number of heapOopSize words used by non-static fields in this klass 168 // (including inherited fields but after header_size()). 169 int _nonstatic_field_size; 170 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 171 // Constant pool index to the utf8 entry of the Generic signature, 172 // or 0 if none. 173 u2 _generic_signature_index; 174 // Constant pool index to the utf8 entry for the name of source file 175 // containing this klass, 0 if not specified. 176 u2 _source_file_name_index; 177 u2 _static_oop_field_count;// number of static oop fields in this klass 178 u2 _java_fields_count; // The number of declared Java fields 179 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 180 181 // _is_marked_dependent can be set concurrently, thus cannot be part of the 182 // _misc_flags. 183 bool _is_marked_dependent; // used for marking during flushing and deoptimization 184 185 // The low two bits of _misc_flags contains the kind field. 186 // This can be used to quickly discriminate among the four kinds of 187 // InstanceKlass. 188 189 static const unsigned _misc_kind_field_size = 2; 190 static const unsigned _misc_kind_field_pos = 0; 191 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u; 192 193 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass 194 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass 195 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass 196 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass 197 198 // Start after _misc_kind field. 199 enum { 200 _misc_rewritten = 1 << 2, // methods rewritten. 201 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops 202 _misc_should_verify_class = 1 << 4, // allow caching of preverification 203 _misc_is_anonymous = 1 << 5, // has embedded _host_klass field 204 _misc_is_contended = 1 << 6, // marked with contended annotation 205 _misc_has_default_methods = 1 << 7, // class/superclass/implemented interfaces has default methods 206 _misc_declares_default_methods = 1 << 8, // directly declares default methods (any access) 207 _misc_has_been_redefined = 1 << 9, // class has been redefined 208 _misc_is_scratch_class = 1 << 10 // class is the redefined scratch class 209 }; 210 u2 _misc_flags; 211 u2 _minor_version; // minor version number of class file 212 u2 _major_version; // major version number of class file 213 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) 214 int _vtable_len; // length of Java vtable (in words) 215 int _itable_len; // length of Java itable (in words) 216 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 217 MemberNameTable* _member_names; // Member names 218 JNIid* _jni_ids; // First JNI identifier for static fields in this class 219 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 220 intptr_t _dep_context; // packed DependencyContext structure 221 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 222 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 223 // Linked instanceKlasses of previous versions 224 InstanceKlass* _previous_versions; 225 // JVMTI fields can be moved to their own structure - see 6315920 226 // JVMTI: cached class file, before retransformable agent modified it in CFLH 227 JvmtiCachedClassFileData* _cached_class_file; 228 229 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 230 231 // Class states are defined as ClassState (see above). 232 // Place the _init_state here to utilize the unused 2-byte after 233 // _idnum_allocated_count. 234 u1 _init_state; // state of class 235 u1 _reference_type; // reference type 236 237 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 238 239 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 240 241 // Method array. 242 Array<Method*>* _methods; 243 // Default Method Array, concrete methods inherited from interfaces 244 Array<Method*>* _default_methods; 245 // Interface (Klass*s) this class declares locally to implement. 246 Array<Klass*>* _local_interfaces; 247 // Interface (Klass*s) this class implements transitively. 248 Array<Klass*>* _transitive_interfaces; 249 // Int array containing the original order of method in the class file (for JVMTI). 250 Array<int>* _method_ordering; 251 // Int array containing the vtable_indices for default_methods 252 // offset matches _default_methods offset 253 Array<int>* _default_vtable_indices; 254 255 // Instance and static variable information, starts with 6-tuples of shorts 256 // [access, name index, sig index, initval index, low_offset, high_offset] 257 // for all fields, followed by the generic signature data at the end of 258 // the array. Only fields with generic signature attributes have the generic 259 // signature data set in the array. The fields array looks like following: 260 // 261 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 262 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 263 // ... 264 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 265 // [generic signature index] 266 // [generic signature index] 267 // ... 268 Array<u2>* _fields; 269 270 // embedded Java vtable follows here 271 // embedded Java itables follows here 272 // embedded static fields follows here 273 // embedded nonstatic oop-map blocks follows here 274 // embedded implementor of this interface follows here 275 // The embedded implementor only exists if the current klass is an 276 // iterface. The possible values of the implementor fall into following 277 // three cases: 278 // NULL: no implementor. 279 // A Klass* that's not itself: one implementor. 280 // Itself: more than one implementors. 281 // embedded host klass follows here 282 // The embedded host klass only exists in an anonymous class for 283 // dynamic language support (JSR 292 enabled). The host class grants 284 // its access privileges to this class also. The host class is either 285 // named, or a previously loaded anonymous class. A non-anonymous class 286 // or an anonymous class loaded through normal classloading does not 287 // have this embedded field. 288 // 289 290 friend class SystemDictionary; 291 292 public: 293 bool has_nonstatic_fields() const { 294 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 295 } 296 void set_has_nonstatic_fields(bool b) { 297 if (b) { 298 _misc_flags |= _misc_has_nonstatic_fields; 299 } else { 300 _misc_flags &= ~_misc_has_nonstatic_fields; 301 } 302 } 303 304 // field sizes 305 int nonstatic_field_size() const { return _nonstatic_field_size; } 306 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 307 308 int static_field_size() const { return _static_field_size; } 309 void set_static_field_size(int size) { _static_field_size = size; } 310 311 int static_oop_field_count() const { return (int)_static_oop_field_count; } 312 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 313 314 // Java vtable 315 int vtable_length() const { return _vtable_len; } 316 void set_vtable_length(int len) { _vtable_len = len; } 317 318 // Java itable 319 int itable_length() const { return _itable_len; } 320 void set_itable_length(int len) { _itable_len = len; } 321 322 // array klasses 323 Klass* array_klasses() const { return _array_klasses; } 324 void set_array_klasses(Klass* k) { _array_klasses = k; } 325 326 // methods 327 Array<Method*>* methods() const { return _methods; } 328 void set_methods(Array<Method*>* a) { _methods = a; } 329 Method* method_with_idnum(int idnum); 330 Method* method_with_orig_idnum(int idnum); 331 Method* method_with_orig_idnum(int idnum, int version); 332 333 // method ordering 334 Array<int>* method_ordering() const { return _method_ordering; } 335 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 336 void copy_method_ordering(const intArray* m, TRAPS); 337 338 // default_methods 339 Array<Method*>* default_methods() const { return _default_methods; } 340 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 341 342 // default method vtable_indices 343 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 344 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 345 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 346 347 // interfaces 348 Array<Klass*>* local_interfaces() const { return _local_interfaces; } 349 void set_local_interfaces(Array<Klass*>* a) { 350 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 351 _local_interfaces = a; } 352 353 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; } 354 void set_transitive_interfaces(Array<Klass*>* a) { 355 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 356 _transitive_interfaces = a; 357 } 358 359 private: 360 friend class fieldDescriptor; 361 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 362 363 public: 364 int field_offset (int index) const { return field(index)->offset(); } 365 int field_access_flags(int index) const { return field(index)->access_flags(); } 366 Symbol* field_name (int index) const { return field(index)->name(constants()); } 367 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 368 369 // Number of Java declared fields 370 int java_fields_count() const { return (int)_java_fields_count; } 371 372 Array<u2>* fields() const { return _fields; } 373 void set_fields(Array<u2>* f, u2 java_fields_count) { 374 guarantee(_fields == NULL || f == NULL, "Just checking"); 375 _fields = f; 376 _java_fields_count = java_fields_count; 377 } 378 379 // inner classes 380 Array<u2>* inner_classes() const { return _inner_classes; } 381 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 382 383 enum InnerClassAttributeOffset { 384 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 385 inner_class_inner_class_info_offset = 0, 386 inner_class_outer_class_info_offset = 1, 387 inner_class_inner_name_offset = 2, 388 inner_class_access_flags_offset = 3, 389 inner_class_next_offset = 4 390 }; 391 392 enum EnclosingMethodAttributeOffset { 393 enclosing_method_class_index_offset = 0, 394 enclosing_method_method_index_offset = 1, 395 enclosing_method_attribute_size = 2 396 }; 397 398 // method override check 399 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 400 401 // package 402 bool is_same_class_package(const Klass* class2) const; 403 bool is_same_class_package(oop classloader2, const Symbol* classname2) const; 404 static bool is_same_class_package(oop class_loader1, 405 const Symbol* class_name1, 406 oop class_loader2, 407 const Symbol* class_name2); 408 409 // find an enclosing class 410 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const { 411 return compute_enclosing_class_impl(this, inner_is_member, THREAD); 412 } 413 static InstanceKlass* compute_enclosing_class_impl(const InstanceKlass* self, 414 bool* inner_is_member, 415 TRAPS); 416 417 // Find InnerClasses attribute for k and return outer_class_info_index & inner_name_index. 418 static bool find_inner_classes_attr(instanceKlassHandle k, 419 int* ooff, int* noff, TRAPS); 420 421 // tell if two classes have the same enclosing class (at package level) 422 bool is_same_package_member(const Klass* class2, TRAPS) const { 423 return is_same_package_member_impl(this, class2, THREAD); 424 } 425 static bool is_same_package_member_impl(const InstanceKlass* self, 426 const Klass* class2, 427 TRAPS); 428 429 // initialization state 430 bool is_loaded() const { return _init_state >= loaded; } 431 bool is_linked() const { return _init_state >= linked; } 432 bool is_initialized() const { return _init_state == fully_initialized; } 433 bool is_not_initialized() const { return _init_state < being_initialized; } 434 bool is_being_initialized() const { return _init_state == being_initialized; } 435 bool is_in_error_state() const { return _init_state == initialization_error; } 436 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 437 ClassState init_state() { return (ClassState)_init_state; } 438 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 439 440 // defineClass specified verification 441 bool should_verify_class() const { 442 return (_misc_flags & _misc_should_verify_class) != 0; 443 } 444 void set_should_verify_class(bool value) { 445 if (value) { 446 _misc_flags |= _misc_should_verify_class; 447 } else { 448 _misc_flags &= ~_misc_should_verify_class; 449 } 450 } 451 452 // marking 453 bool is_marked_dependent() const { return _is_marked_dependent; } 454 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 455 456 // initialization (virtuals from Klass) 457 bool should_be_initialized() const; // means that initialize should be called 458 void initialize(TRAPS); 459 void link_class(TRAPS); 460 bool link_class_or_fail(TRAPS); // returns false on failure 461 void unlink_class(); 462 void rewrite_class(TRAPS); 463 void link_methods(TRAPS); 464 Method* class_initializer(); 465 466 // set the class to initialized if no static initializer is present 467 void eager_initialize(Thread *thread); 468 469 // reference type 470 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 471 void set_reference_type(ReferenceType t) { 472 assert(t == (u1)t, "overflow"); 473 _reference_type = (u1)t; 474 } 475 476 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 477 478 // find local field, returns true if found 479 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 480 // find field in direct superinterfaces, returns the interface in which the field is defined 481 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 482 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 483 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 484 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 485 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 486 487 // find a non-static or static field given its offset within the class. 488 bool contains_field_offset(int offset) { 489 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); 490 } 491 492 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 493 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 494 495 // find a local method (returns NULL if not found) 496 Method* find_method(const Symbol* name, const Symbol* signature) const; 497 static Method* find_method(const Array<Method*>* methods, 498 const Symbol* name, 499 const Symbol* signature); 500 501 // find a local method, but skip static methods 502 Method* find_instance_method(const Symbol* name, const Symbol* signature) const; 503 static Method* find_instance_method(const Array<Method*>* methods, 504 const Symbol* name, 505 const Symbol* signature); 506 507 // find a local method (returns NULL if not found) 508 Method* find_local_method(const Symbol* name, 509 const Symbol* signature, 510 OverpassLookupMode overpass_mode, 511 StaticLookupMode static_mode, 512 PrivateLookupMode private_mode) const; 513 514 // find a local method from given methods array (returns NULL if not found) 515 static Method* find_local_method(const Array<Method*>* methods, 516 const Symbol* name, 517 const Symbol* signature, 518 OverpassLookupMode overpass_mode, 519 StaticLookupMode static_mode, 520 PrivateLookupMode private_mode); 521 522 // find a local method index in methods or default_methods (returns -1 if not found) 523 static int find_method_index(const Array<Method*>* methods, 524 const Symbol* name, 525 const Symbol* signature, 526 OverpassLookupMode overpass_mode, 527 StaticLookupMode static_mode, 528 PrivateLookupMode private_mode); 529 530 // lookup operation (returns NULL if not found) 531 Method* uncached_lookup_method(const Symbol* name, 532 const Symbol* signature, 533 OverpassLookupMode overpass_mode) const; 534 535 // lookup a method in all the interfaces that this class implements 536 // (returns NULL if not found) 537 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 538 539 // lookup a method in local defaults then in all interfaces 540 // (returns NULL if not found) 541 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 542 543 // Find method indices by name. If a method with the specified name is 544 // found the index to the first method is returned, and 'end' is filled in 545 // with the index of first non-name-matching method. If no method is found 546 // -1 is returned. 547 int find_method_by_name(const Symbol* name, int* end) const; 548 static int find_method_by_name(const Array<Method*>* methods, 549 const Symbol* name, int* end); 550 551 // constant pool 552 ConstantPool* constants() const { return _constants; } 553 void set_constants(ConstantPool* c) { _constants = c; } 554 555 // protection domain 556 oop protection_domain() const; 557 558 // signers 559 objArrayOop signers() const; 560 561 // host class 562 Klass* host_klass() const { 563 Klass** hk = (Klass**)adr_host_klass(); 564 if (hk == NULL) { 565 return NULL; 566 } else { 567 assert(*hk != NULL, "host klass should always be set if the address is not null"); 568 return *hk; 569 } 570 } 571 void set_host_klass(const Klass* host) { 572 assert(is_anonymous(), "not anonymous"); 573 const Klass** addr = (const Klass**)adr_host_klass(); 574 assert(addr != NULL, "no reversed space"); 575 if (addr != NULL) { 576 *addr = host; 577 } 578 } 579 bool is_anonymous() const { 580 return (_misc_flags & _misc_is_anonymous) != 0; 581 } 582 void set_is_anonymous(bool value) { 583 if (value) { 584 _misc_flags |= _misc_is_anonymous; 585 } else { 586 _misc_flags &= ~_misc_is_anonymous; 587 } 588 } 589 590 // Oop that keeps the metadata for this class from being unloaded 591 // in places where the metadata is stored in other places, like nmethods 592 oop klass_holder() const { 593 return is_anonymous() ? java_mirror() : class_loader(); 594 } 595 596 bool is_contended() const { 597 return (_misc_flags & _misc_is_contended) != 0; 598 } 599 void set_is_contended(bool value) { 600 if (value) { 601 _misc_flags |= _misc_is_contended; 602 } else { 603 _misc_flags &= ~_misc_is_contended; 604 } 605 } 606 607 // source file name 608 Symbol* source_file_name() const { 609 return (_source_file_name_index == 0) ? 610 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index); 611 } 612 u2 source_file_name_index() const { 613 return _source_file_name_index; 614 } 615 void set_source_file_name_index(u2 sourcefile_index) { 616 _source_file_name_index = sourcefile_index; 617 } 618 619 // minor and major version numbers of class file 620 u2 minor_version() const { return _minor_version; } 621 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 622 u2 major_version() const { return _major_version; } 623 void set_major_version(u2 major_version) { _major_version = major_version; } 624 625 // source debug extension 626 const char* source_debug_extension() const { return _source_debug_extension; } 627 void set_source_debug_extension(const char* array, int length); 628 629 // symbol unloading support (refcount already added) 630 Symbol* array_name() { return _array_name; } 631 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; } 632 633 // nonstatic oop-map blocks 634 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 635 return oop_map_count * OopMapBlock::size_in_words(); 636 } 637 unsigned int nonstatic_oop_map_count() const { 638 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 639 } 640 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 641 void set_nonstatic_oop_map_size(int words) { 642 _nonstatic_oop_map_size = words; 643 } 644 645 // RedefineClasses() support for previous versions: 646 void add_previous_version(instanceKlassHandle ikh, int emcp_method_count); 647 648 InstanceKlass* previous_versions() const { return _previous_versions; } 649 650 InstanceKlass* get_klass_version(int version) { 651 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 652 if (ik->constants()->version() == version) { 653 return ik; 654 } 655 } 656 return NULL; 657 } 658 659 bool has_been_redefined() const { 660 return (_misc_flags & _misc_has_been_redefined) != 0; 661 } 662 void set_has_been_redefined() { 663 _misc_flags |= _misc_has_been_redefined; 664 } 665 666 bool is_scratch_class() const { 667 return (_misc_flags & _misc_is_scratch_class) != 0; 668 } 669 670 void set_is_scratch_class() { 671 _misc_flags |= _misc_is_scratch_class; 672 } 673 674 private: 675 676 void set_kind(unsigned kind) { 677 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind"); 678 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos; 679 unsigned flags = _misc_flags & ~fmask; 680 _misc_flags = (flags | (kind << _misc_kind_field_pos)); 681 } 682 683 bool is_kind(unsigned desired) const { 684 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask; 685 return kind == desired; 686 } 687 688 public: 689 690 // Other is anything that is not one of the more specialized kinds of InstanceKlass. 691 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); } 692 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); } 693 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); } 694 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); } 695 696 void init_previous_versions() { 697 _previous_versions = NULL; 698 } 699 700 private: 701 static int _previous_version_count; 702 public: 703 static void purge_previous_versions(InstanceKlass* ik); 704 static bool has_previous_versions() { return _previous_version_count > 0; } 705 706 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 707 void set_cached_class_file(JvmtiCachedClassFileData *data) { 708 _cached_class_file = data; 709 } 710 JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; } 711 jint get_cached_class_file_len(); 712 unsigned char * get_cached_class_file_bytes(); 713 714 // JVMTI: Support for caching of field indices, types, and offsets 715 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 716 _jvmti_cached_class_field_map = descriptor; 717 } 718 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 719 return _jvmti_cached_class_field_map; 720 } 721 722 bool has_default_methods() const { 723 return (_misc_flags & _misc_has_default_methods) != 0; 724 } 725 void set_has_default_methods(bool b) { 726 if (b) { 727 _misc_flags |= _misc_has_default_methods; 728 } else { 729 _misc_flags &= ~_misc_has_default_methods; 730 } 731 } 732 733 bool declares_default_methods() const { 734 return (_misc_flags & _misc_declares_default_methods) != 0; 735 } 736 void set_declares_default_methods(bool b) { 737 if (b) { 738 _misc_flags |= _misc_declares_default_methods; 739 } else { 740 _misc_flags &= ~_misc_declares_default_methods; 741 } 742 } 743 744 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 745 inline u2 next_method_idnum(); 746 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 747 748 // generics support 749 Symbol* generic_signature() const { 750 return (_generic_signature_index == 0) ? 751 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index); 752 } 753 u2 generic_signature_index() const { 754 return _generic_signature_index; 755 } 756 void set_generic_signature_index(u2 sig_index) { 757 _generic_signature_index = sig_index; 758 } 759 760 u2 enclosing_method_data(int offset) const; 761 u2 enclosing_method_class_index() const { 762 return enclosing_method_data(enclosing_method_class_index_offset); 763 } 764 u2 enclosing_method_method_index() { 765 return enclosing_method_data(enclosing_method_method_index_offset); 766 } 767 void set_enclosing_method_indices(u2 class_index, 768 u2 method_index); 769 770 // jmethodID support 771 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, 772 const methodHandle& method_h); 773 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h, 774 size_t idnum, jmethodID new_id, jmethodID* new_jmeths, 775 jmethodID* to_dealloc_id_p, 776 jmethodID** to_dealloc_jmeths_p); 777 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 778 size_t *length_p, jmethodID* id_p); 779 void ensure_space_for_methodids(int start_offset = 0); 780 jmethodID jmethod_id_or_null(Method* method); 781 782 // annotations support 783 Annotations* annotations() const { return _annotations; } 784 void set_annotations(Annotations* anno) { _annotations = anno; } 785 786 AnnotationArray* class_annotations() const { 787 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 788 } 789 Array<AnnotationArray*>* fields_annotations() const { 790 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 791 } 792 AnnotationArray* class_type_annotations() const { 793 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 794 } 795 Array<AnnotationArray*>* fields_type_annotations() const { 796 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 797 } 798 // allocation 799 instanceOop allocate_instance(TRAPS); 800 801 // additional member function to return a handle 802 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } 803 804 objArrayOop allocate_objArray(int n, int length, TRAPS); 805 // Helper function 806 static instanceOop register_finalizer(instanceOop i, TRAPS); 807 808 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 809 // if not, throw either an Error or an Exception. 810 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 811 812 // initialization 813 void call_class_initializer(TRAPS); 814 void set_initialization_state_and_notify(ClassState state, TRAPS); 815 816 // OopMapCache support 817 OopMapCache* oop_map_cache() { return _oop_map_cache; } 818 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 819 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 820 821 // JNI identifier support (for static fields - for jni performance) 822 JNIid* jni_ids() { return _jni_ids; } 823 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 824 JNIid* jni_id_for(int offset); 825 826 // maintenance of deoptimization dependencies 827 inline DependencyContext dependencies(); 828 int mark_dependent_nmethods(DepChange& changes); 829 void add_dependent_nmethod(nmethod* nm); 830 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately); 831 832 // On-stack replacement support 833 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 834 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 835 void add_osr_nmethod(nmethod* n); 836 void remove_osr_nmethod(nmethod* n); 837 int mark_osr_nmethods(const Method* m); 838 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 839 840 // Breakpoint support (see methods on Method* for details) 841 BreakpointInfo* breakpoints() const { return _breakpoints; }; 842 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 843 844 // support for stub routines 845 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 846 TRACE_DEFINE_OFFSET; 847 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 848 849 // subclass/subinterface checks 850 bool implements_interface(Klass* k) const; 851 bool is_same_or_direct_interface(Klass* k) const; 852 853 #ifdef ASSERT 854 // check whether this class or one of its superclasses was redefined 855 bool has_redefined_this_or_super() const; 856 #endif 857 858 // Access to the implementor of an interface. 859 Klass* implementor() const 860 { 861 Klass** k = adr_implementor(); 862 if (k == NULL) { 863 return NULL; 864 } else { 865 return *k; 866 } 867 } 868 869 void set_implementor(Klass* k) { 870 assert(is_interface(), "not interface"); 871 Klass** addr = adr_implementor(); 872 assert(addr != NULL, "null addr"); 873 if (addr != NULL) { 874 *addr = k; 875 } 876 } 877 878 int nof_implementors() const { 879 Klass* k = implementor(); 880 if (k == NULL) { 881 return 0; 882 } else if (k != this) { 883 return 1; 884 } else { 885 return 2; 886 } 887 } 888 889 void add_implementor(Klass* k); // k is a new class that implements this interface 890 void init_implementor(); // initialize 891 892 // link this class into the implementors list of every interface it implements 893 void process_interfaces(Thread *thread); 894 895 // virtual operations from Klass 896 bool is_leaf_class() const { return _subklass == NULL; } 897 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); 898 bool compute_is_subtype_of(Klass* k); 899 bool can_be_primary_super_slow() const; 900 int oop_size(oop obj) const { return size_helper(); } 901 // slow because it's a virtual call and used for verifying the layout_helper. 902 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 903 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 904 905 // Iterators 906 void do_local_static_fields(FieldClosure* cl); 907 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 908 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 909 910 void methods_do(void f(Method* method)); 911 void array_klasses_do(void f(Klass* k)); 912 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 913 bool super_types_do(SuperTypeClosure* blk); 914 915 static InstanceKlass* cast(Klass* k) { 916 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 917 } 918 919 static const InstanceKlass* cast(const Klass* k) { 920 assert(k != NULL, "k should not be null"); 921 assert(k->is_instance_klass(), "cast to InstanceKlass"); 922 return static_cast<const InstanceKlass*>(k); 923 } 924 925 InstanceKlass* java_super() const { 926 return (super() == NULL) ? NULL : cast(super()); 927 } 928 929 // Sizing (in words) 930 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); } 931 932 static int size(int vtable_length, int itable_length, 933 int nonstatic_oop_map_size, 934 bool is_interface, bool is_anonymous) { 935 return align_object_size(header_size() + 936 align_object_offset(vtable_length) + 937 align_object_offset(itable_length) + 938 ((is_interface || is_anonymous) ? 939 align_object_offset(nonstatic_oop_map_size) : 940 nonstatic_oop_map_size) + 941 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) + 942 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0)); 943 } 944 int size() const { return size(vtable_length(), 945 itable_length(), 946 nonstatic_oop_map_size(), 947 is_interface(), 948 is_anonymous()); 949 } 950 #if INCLUDE_SERVICES 951 virtual void collect_statistics(KlassSizeStats *sz) const; 952 #endif 953 954 static int vtable_start_offset() { return header_size(); } 955 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; } 956 957 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); } 958 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); } 959 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 960 961 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 962 963 address static_field_addr(int offset); 964 965 OopMapBlock* start_of_nonstatic_oop_maps() const { 966 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length())); 967 } 968 969 Klass** end_of_nonstatic_oop_maps() const { 970 return (Klass**)(start_of_nonstatic_oop_maps() + 971 nonstatic_oop_map_count()); 972 } 973 974 Klass** adr_implementor() const { 975 if (is_interface()) { 976 return (Klass**)end_of_nonstatic_oop_maps(); 977 } else { 978 return NULL; 979 } 980 }; 981 982 Klass** adr_host_klass() const { 983 if (is_anonymous()) { 984 Klass** adr_impl = adr_implementor(); 985 if (adr_impl != NULL) { 986 return adr_impl + 1; 987 } else { 988 return end_of_nonstatic_oop_maps(); 989 } 990 } else { 991 return NULL; 992 } 993 } 994 995 // Use this to return the size of an instance in heap words: 996 int size_helper() const { 997 return layout_helper_to_size_helper(layout_helper()); 998 } 999 1000 // This bit is initialized in classFileParser.cpp. 1001 // It is false under any of the following conditions: 1002 // - the class is abstract (including any interface) 1003 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1004 // - the class size is larger than FastAllocateSizeLimit 1005 // - the class is java/lang/Class, which cannot be allocated directly 1006 bool can_be_fastpath_allocated() const { 1007 return !layout_helper_needs_slow_path(layout_helper()); 1008 } 1009 1010 // Java vtable/itable 1011 klassVtable* vtable() const; // return new klassVtable wrapper 1012 inline Method* method_at_vtable(int index); 1013 klassItable* itable() const; // return new klassItable wrapper 1014 Method* method_at_itable(Klass* holder, int index, TRAPS); 1015 1016 #if INCLUDE_JVMTI 1017 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed); 1018 #endif // INCLUDE_JVMTI 1019 1020 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive); 1021 void clean_implementors_list(BoolObjectClosure* is_alive); 1022 void clean_method_data(BoolObjectClosure* is_alive); 1023 1024 // Explicit metaspace deallocation of fields 1025 // For RedefineClasses and class file parsing errors, we need to deallocate 1026 // instanceKlasses and the metadata they point to. 1027 void deallocate_contents(ClassLoaderData* loader_data); 1028 static void deallocate_methods(ClassLoaderData* loader_data, 1029 Array<Method*>* methods); 1030 void static deallocate_interfaces(ClassLoaderData* loader_data, 1031 const Klass* super_klass, 1032 Array<Klass*>* local_interfaces, 1033 Array<Klass*>* transitive_interfaces); 1034 1035 // The constant pool is on stack if any of the methods are executing or 1036 // referenced by handles. 1037 bool on_stack() const { return _constants->on_stack(); } 1038 1039 // callbacks for actions during class unloading 1040 static void notify_unload_class(InstanceKlass* ik); 1041 static void release_C_heap_structures(InstanceKlass* ik); 1042 1043 // Naming 1044 const char* signature_name() const; 1045 1046 // GC specific object visitors 1047 // 1048 // Mark Sweep 1049 int oop_ms_adjust_pointers(oop obj); 1050 #if INCLUDE_ALL_GCS 1051 // Parallel Scavenge 1052 void oop_ps_push_contents( oop obj, PSPromotionManager* pm); 1053 // Parallel Compact 1054 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm); 1055 void oop_pc_update_pointers(oop obj); 1056 #endif 1057 1058 // Oop fields (and metadata) iterators 1059 // [nv = true] Use non-virtual calls to do_oop_nv. 1060 // [nv = false] Use virtual calls to do_oop. 1061 // 1062 // The InstanceKlass iterators also visits the Object's klass. 1063 1064 // Forward iteration 1065 public: 1066 // Iterate over all oop fields in the oop maps. 1067 template <bool nv, class OopClosureType> 1068 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1069 1070 protected: 1071 // Iterate over all oop fields and metadata. 1072 template <bool nv, class OopClosureType> 1073 inline int oop_oop_iterate(oop obj, OopClosureType* closure); 1074 1075 private: 1076 // Iterate over all oop fields in the oop maps. 1077 // Specialized for [T = oop] or [T = narrowOop]. 1078 template <bool nv, typename T, class OopClosureType> 1079 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure); 1080 1081 // Iterate over all oop fields in one oop map. 1082 template <bool nv, typename T, class OopClosureType> 1083 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1084 1085 1086 // Reverse iteration 1087 #if INCLUDE_ALL_GCS 1088 public: 1089 // Iterate over all oop fields in the oop maps. 1090 template <bool nv, class OopClosureType> 1091 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1092 1093 protected: 1094 // Iterate over all oop fields and metadata. 1095 template <bool nv, class OopClosureType> 1096 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1097 1098 private: 1099 // Iterate over all oop fields in the oop maps. 1100 // Specialized for [T = oop] or [T = narrowOop]. 1101 template <bool nv, typename T, class OopClosureType> 1102 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure); 1103 1104 // Iterate over all oop fields in one oop map. 1105 template <bool nv, typename T, class OopClosureType> 1106 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1107 #endif 1108 1109 1110 // Bounded range iteration 1111 public: 1112 // Iterate over all oop fields in the oop maps. 1113 template <bool nv, class OopClosureType> 1114 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1115 1116 protected: 1117 // Iterate over all oop fields and metadata. 1118 template <bool nv, class OopClosureType> 1119 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1120 1121 private: 1122 // Iterate over all oop fields in the oop maps. 1123 // Specialized for [T = oop] or [T = narrowOop]. 1124 template <bool nv, typename T, class OopClosureType> 1125 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1126 1127 // Iterate over all oop fields in one oop map. 1128 template <bool nv, typename T, class OopClosureType> 1129 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1130 1131 1132 public: 1133 1134 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL) 1135 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL) 1136 1137 #if INCLUDE_ALL_GCS 1138 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS) 1139 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS) 1140 #endif // INCLUDE_ALL_GCS 1141 1142 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1143 1144 public: 1145 void set_in_error_state() { 1146 assert(DumpSharedSpaces, "only call this when dumping archive"); 1147 _init_state = initialization_error; 1148 } 1149 bool check_sharing_error_state(); 1150 1151 private: 1152 // initialization state 1153 #ifdef ASSERT 1154 void set_init_state(ClassState state); 1155 #else 1156 void set_init_state(ClassState state) { _init_state = (u1)state; } 1157 #endif 1158 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1159 void set_init_thread(Thread *thread) { _init_thread = thread; } 1160 1161 // The RedefineClasses() API can cause new method idnums to be needed 1162 // which will cause the caches to grow. Safety requires different 1163 // cache management logic if the caches can grow instead of just 1164 // going from NULL to non-NULL. 1165 bool idnum_can_increment() const { return has_been_redefined(); } 1166 jmethodID* methods_jmethod_ids_acquire() const 1167 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); } 1168 void release_set_methods_jmethod_ids(jmethodID* jmeths) 1169 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); } 1170 1171 // Lock during initialization 1172 public: 1173 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1174 // Must be one per class and it has to be a VM internal object so java code 1175 // cannot lock it (like the mirror). 1176 // It has to be an object not a Mutex because it's held through java calls. 1177 oop init_lock() const; 1178 private: 1179 void fence_and_clear_init_lock(); 1180 1181 // Static methods that are used to implement member methods where an exposed this pointer 1182 // is needed due to possible GCs 1183 static bool link_class_impl (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS); 1184 static bool verify_code (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS); 1185 static void initialize_impl (instanceKlassHandle this_k, TRAPS); 1186 static void initialize_super_interfaces (instanceKlassHandle this_k, TRAPS); 1187 static void eager_initialize_impl (instanceKlassHandle this_k); 1188 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_k, ClassState state, TRAPS); 1189 static void call_class_initializer_impl (instanceKlassHandle this_k, TRAPS); 1190 static Klass* array_klass_impl (instanceKlassHandle this_k, bool or_null, int n, TRAPS); 1191 static void do_local_static_fields_impl (instanceKlassHandle this_k, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS); 1192 /* jni_id_for_impl for jfieldID only */ 1193 static JNIid* jni_id_for_impl (instanceKlassHandle this_k, int offset); 1194 1195 // Returns the array class for the n'th dimension 1196 Klass* array_klass_impl(bool or_null, int n, TRAPS); 1197 1198 // Returns the array class with this class as element type 1199 Klass* array_klass_impl(bool or_null, TRAPS); 1200 1201 // find a local method (returns NULL if not found) 1202 Method* find_method_impl(const Symbol* name, 1203 const Symbol* signature, 1204 OverpassLookupMode overpass_mode, 1205 StaticLookupMode static_mode, 1206 PrivateLookupMode private_mode) const; 1207 1208 static Method* find_method_impl(const Array<Method*>* methods, 1209 const Symbol* name, 1210 const Symbol* signature, 1211 OverpassLookupMode overpass_mode, 1212 StaticLookupMode static_mode, 1213 PrivateLookupMode private_mode); 1214 1215 // Free CHeap allocated fields. 1216 void release_C_heap_structures(); 1217 1218 // RedefineClasses support 1219 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1220 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1221 public: 1222 // CDS support - remove and restore oops from metadata. Oops are not shared. 1223 virtual void remove_unshareable_info(); 1224 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 1225 1226 // jvm support 1227 jint compute_modifier_flags(TRAPS) const; 1228 1229 // JSR-292 support 1230 MemberNameTable* member_names() { return _member_names; } 1231 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; } 1232 bool add_member_name(Handle member_name); 1233 1234 public: 1235 // JVMTI support 1236 jint jvmti_class_status() const; 1237 1238 public: 1239 // Printing 1240 #ifndef PRODUCT 1241 void print_on(outputStream* st) const; 1242 #endif 1243 void print_value_on(outputStream* st) const; 1244 1245 void oop_print_value_on(oop obj, outputStream* st); 1246 1247 #ifndef PRODUCT 1248 void oop_print_on (oop obj, outputStream* st); 1249 1250 void print_dependent_nmethods(bool verbose = false); 1251 bool is_dependent_nmethod(nmethod* nm); 1252 #endif 1253 1254 const char* internal_name() const; 1255 1256 // Verification 1257 void verify_on(outputStream* st); 1258 1259 void oop_verify_on(oop obj, outputStream* st); 1260 }; 1261 1262 inline Method* InstanceKlass::method_at_vtable(int index) { 1263 #ifndef PRODUCT 1264 assert(index >= 0, "valid vtable index"); 1265 if (DebugVtables) { 1266 verify_vtable_index(index); 1267 } 1268 #endif 1269 vtableEntry* ve = (vtableEntry*)start_of_vtable(); 1270 return ve[index].method(); 1271 } 1272 1273 // for adding methods 1274 // UNSET_IDNUM return means no more ids available 1275 inline u2 InstanceKlass::next_method_idnum() { 1276 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1277 return ConstMethod::UNSET_IDNUM; // no more ids available 1278 } else { 1279 return _idnum_allocated_count++; 1280 } 1281 } 1282 1283 1284 /* JNIid class for jfieldIDs only */ 1285 class JNIid: public CHeapObj<mtClass> { 1286 friend class VMStructs; 1287 private: 1288 Klass* _holder; 1289 JNIid* _next; 1290 int _offset; 1291 #ifdef ASSERT 1292 bool _is_static_field_id; 1293 #endif 1294 1295 public: 1296 // Accessors 1297 Klass* holder() const { return _holder; } 1298 int offset() const { return _offset; } 1299 JNIid* next() { return _next; } 1300 // Constructor 1301 JNIid(Klass* holder, int offset, JNIid* next); 1302 // Identifier lookup 1303 JNIid* find(int offset); 1304 1305 bool find_local_field(fieldDescriptor* fd) { 1306 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1307 } 1308 1309 static void deallocate(JNIid* id); 1310 // Debugging 1311 #ifdef ASSERT 1312 bool is_static_field_id() const { return _is_static_field_id; } 1313 void set_is_static_field_id() { _is_static_field_id = true; } 1314 #endif 1315 void verify(Klass* holder); 1316 }; 1317 1318 // An iterator that's used to access the inner classes indices in the 1319 // InstanceKlass::_inner_classes array. 1320 class InnerClassesIterator : public StackObj { 1321 private: 1322 Array<jushort>* _inner_classes; 1323 int _length; 1324 int _idx; 1325 public: 1326 1327 InnerClassesIterator(instanceKlassHandle k) { 1328 _inner_classes = k->inner_classes(); 1329 if (k->inner_classes() != NULL) { 1330 _length = _inner_classes->length(); 1331 // The inner class array's length should be the multiple of 1332 // inner_class_next_offset if it only contains the InnerClasses 1333 // attribute data, or it should be 1334 // n*inner_class_next_offset+enclosing_method_attribute_size 1335 // if it also contains the EnclosingMethod data. 1336 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1337 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1338 "just checking"); 1339 // Remove the enclosing_method portion if exists. 1340 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1341 _length -= InstanceKlass::enclosing_method_attribute_size; 1342 } 1343 } else { 1344 _length = 0; 1345 } 1346 _idx = 0; 1347 } 1348 1349 int length() const { 1350 return _length; 1351 } 1352 1353 void next() { 1354 _idx += InstanceKlass::inner_class_next_offset; 1355 } 1356 1357 bool done() const { 1358 return (_idx >= _length); 1359 } 1360 1361 u2 inner_class_info_index() const { 1362 return _inner_classes->at( 1363 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1364 } 1365 1366 void set_inner_class_info_index(u2 index) { 1367 _inner_classes->at_put( 1368 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1369 } 1370 1371 u2 outer_class_info_index() const { 1372 return _inner_classes->at( 1373 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1374 } 1375 1376 void set_outer_class_info_index(u2 index) { 1377 _inner_classes->at_put( 1378 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1379 } 1380 1381 u2 inner_name_index() const { 1382 return _inner_classes->at( 1383 _idx + InstanceKlass::inner_class_inner_name_offset); 1384 } 1385 1386 void set_inner_name_index(u2 index) { 1387 _inner_classes->at_put( 1388 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1389 } 1390 1391 u2 inner_access_flags() const { 1392 return _inner_classes->at( 1393 _idx + InstanceKlass::inner_class_access_flags_offset); 1394 } 1395 }; 1396 1397 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP