1 /* 2 * Copyright (c) 1997, 2016, 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 "logging/logLevel.hpp" 31 #include "memory/referenceType.hpp" 32 #include "oops/annotations.hpp" 33 #include "oops/constMethod.hpp" 34 #include "oops/fieldInfo.hpp" 35 #include "oops/instanceOop.hpp" 36 #include "oops/klassVtable.hpp" 37 #include "runtime/handles.hpp" 38 #include "runtime/os.hpp" 39 #include "trace/traceMacros.hpp" 40 #include "utilities/accessFlags.hpp" 41 #include "utilities/bitMap.inline.hpp" 42 #include "utilities/macros.hpp" 43 44 // An InstanceKlass is the VM level representation of a Java class. 45 // It contains all information needed for at class at execution runtime. 46 47 // InstanceKlass embedded field layout (after declared fields): 48 // [EMBEDDED Java vtable ] size in words = vtable_len 49 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size 50 // The embedded nonstatic oop-map blocks are short pairs (offset, length) 51 // indicating where oops are located in instances of this klass. 52 // [EMBEDDED implementor of the interface] only exist for interface 53 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled) 54 55 56 // forward declaration for class -- see below for definition 57 class BreakpointInfo; 58 class ClassFileParser; 59 class KlassDepChange; 60 class DependencyContext; 61 class fieldDescriptor; 62 class jniIdMapBase; 63 class JNIid; 64 class JvmtiCachedClassFieldMap; 65 class MemberNameTable; 66 class SuperTypeClosure; 67 68 // This is used in iterators below. 69 class FieldClosure: public StackObj { 70 public: 71 virtual void do_field(fieldDescriptor* fd) = 0; 72 }; 73 74 #ifndef PRODUCT 75 // Print fields. 76 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. 77 class FieldPrinter: public FieldClosure { 78 oop _obj; 79 outputStream* _st; 80 public: 81 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} 82 void do_field(fieldDescriptor* fd); 83 }; 84 #endif // !PRODUCT 85 86 // ValueObjs embedded in klass. Describes where oops are located in instances of 87 // this klass. 88 class OopMapBlock VALUE_OBJ_CLASS_SPEC { 89 public: 90 // Byte offset of the first oop mapped by this block. 91 int offset() const { return _offset; } 92 void set_offset(int offset) { _offset = offset; } 93 94 // Number of oops in this block. 95 uint count() const { return _count; } 96 void set_count(uint count) { _count = count; } 97 98 // sizeof(OopMapBlock) in words. 99 static const int size_in_words() { 100 return align_size_up(int(sizeof(OopMapBlock)), wordSize) >> 101 LogBytesPerWord; 102 } 103 104 private: 105 int _offset; 106 uint _count; 107 }; 108 109 struct JvmtiCachedClassFileData; 110 111 class InstanceKlass: public Klass { 112 friend class VMStructs; 113 friend class JVMCIVMStructs; 114 friend class ClassFileParser; 115 friend class CompileReplay; 116 117 protected: 118 InstanceKlass(const ClassFileParser& parser, unsigned kind); 119 120 public: 121 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } 122 123 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 124 // of the class loading & initialization procedure, and the use of the states. 125 enum ClassState { 126 allocated, // allocated (but not yet linked) 127 loaded, // loaded and inserted in class hierarchy (but not linked yet) 128 linked, // successfully linked/verified (but not initialized yet) 129 being_initialized, // currently running class initializer 130 fully_initialized, // initialized (successfull final state) 131 initialization_error // error happened during initialization 132 }; 133 134 static int number_of_instance_classes() { return _total_instanceKlass_count; } 135 136 private: 137 static volatile int _total_instanceKlass_count; 138 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS); 139 140 protected: 141 // Annotations for this class 142 Annotations* _annotations; 143 // Array classes holding elements of this class. 144 Klass* _array_klasses; 145 // Constant pool for this class. 146 ConstantPool* _constants; 147 // The InnerClasses attribute and EnclosingMethod attribute. The 148 // _inner_classes is an array of shorts. If the class has InnerClasses 149 // attribute, then the _inner_classes array begins with 4-tuples of shorts 150 // [inner_class_info_index, outer_class_info_index, 151 // inner_name_index, inner_class_access_flags] for the InnerClasses 152 // attribute. If the EnclosingMethod attribute exists, it occupies the 153 // last two shorts [class_index, method_index] of the array. If only 154 // the InnerClasses attribute exists, the _inner_classes array length is 155 // number_of_inner_classes * 4. If the class has both InnerClasses 156 // and EnclosingMethod attributes the _inner_classes array length is 157 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 158 Array<jushort>* _inner_classes; 159 160 // the source debug extension for this klass, NULL if not specified. 161 // Specified as UTF-8 string without terminating zero byte in the classfile, 162 // it is stored in the instanceklass as a NULL-terminated UTF-8 string 163 const char* _source_debug_extension; 164 // Array name derived from this class which needs unreferencing 165 // if this class is unloaded. 166 Symbol* _array_name; 167 168 // Number of heapOopSize words used by non-static fields in this klass 169 // (including inherited fields but after header_size()). 170 int _nonstatic_field_size; 171 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 172 // Constant pool index to the utf8 entry of the Generic signature, 173 // or 0 if none. 174 u2 _generic_signature_index; 175 // Constant pool index to the utf8 entry for the name of source file 176 // containing this klass, 0 if not specified. 177 u2 _source_file_name_index; 178 u2 _static_oop_field_count;// number of static oop fields in this klass 179 u2 _java_fields_count; // The number of declared Java fields 180 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 181 182 int _itable_len; // length of Java itable (in words) 183 // _is_marked_dependent can be set concurrently, thus cannot be part of the 184 // _misc_flags. 185 bool _is_marked_dependent; // used for marking during flushing and deoptimization 186 187 // The low three bits of _misc_flags contains the kind field. 188 // This can be used to quickly discriminate among the five kinds of 189 // InstanceKlass. 190 191 static const unsigned _misc_kind_field_size = 3; 192 static const unsigned _misc_kind_field_pos = 0; 193 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u; 194 195 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass 196 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass 197 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass 198 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass 199 static const unsigned _misc_kind_value_type = 4; // ValueKlass 200 201 // Start after _misc_kind field. 202 enum { 203 _misc_rewritten = 1 << 3, // methods rewritten. 204 _misc_has_nonstatic_fields = 1 << 4, // for sizing with UseCompressedOops 205 _misc_should_verify_class = 1 << 5, // allow caching of preverification 206 _misc_is_anonymous = 1 << 6, // has embedded _host_klass field 207 _misc_is_contended = 1 << 7, // marked with contended annotation 208 _misc_has_default_methods = 1 << 8, // class/superclass/implemented interfaces has default method 209 _misc_declares_default_methods = 1 << 9, // directly declares default methods (any access) 210 _misc_has_been_redefined = 1 << 10, // class has been redefined 211 _misc_is_scratch_class = 1 << 11,// class is the redefined scratch class 212 _misc_has_self_itable = 1 << 12 // interface has an itable for its own methods (EnableExtraSuper) 213 }; 214 u2 _misc_flags; 215 u2 _minor_version; // minor version number of class file 216 u2 _major_version; // major version number of class file 217 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) 218 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 219 MemberNameTable* _member_names; // Member names 220 JNIid* _jni_ids; // First JNI identifier for static fields in this class 221 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 222 intptr_t _dep_context; // packed DependencyContext structure 223 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 224 BreakpointInfo* _breakpoints; // bpt lists, managed by Method* 225 // Linked instanceKlasses of previous versions 226 InstanceKlass* _previous_versions; 227 // JVMTI fields can be moved to their own structure - see 6315920 228 // JVMTI: cached class file, before retransformable agent modified it in CFLH 229 JvmtiCachedClassFileData* _cached_class_file; 230 231 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 232 233 // Class states are defined as ClassState (see above). 234 // Place the _init_state here to utilize the unused 2-byte after 235 // _idnum_allocated_count. 236 u1 _init_state; // state of class 237 u1 _reference_type; // reference type 238 239 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 240 241 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies 242 243 // Method array. 244 Array<Method*>* _methods; 245 // Default Method Array, concrete methods inherited from interfaces 246 Array<Method*>* _default_methods; 247 // Interface (Klass*s) this class declares locally to implement. 248 Array<Klass*>* _local_interfaces; 249 // Interface (Klass*s) this class implements transitively. 250 Array<Klass*>* _transitive_interfaces; 251 // Int array containing the original order of method in the class file (for JVMTI). 252 Array<int>* _method_ordering; 253 // Int array containing the vtable_indices for default_methods 254 // offset matches _default_methods offset 255 Array<int>* _default_vtable_indices; 256 257 // Instance and static variable information, starts with 6-tuples of shorts 258 // [access, name index, sig index, initval index, low_offset, high_offset] 259 // for all fields, followed by the generic signature data at the end of 260 // the array. Only fields with generic signature attributes have the generic 261 // signature data set in the array. The fields array looks like following: 262 // 263 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 264 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 265 // ... 266 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 267 // [generic signature index] 268 // [generic signature index] 269 // ... 270 Array<u2>* _fields; 271 272 // embedded Java vtable follows here 273 // embedded Java itables follows here 274 // embedded static fields follows here 275 // embedded nonstatic oop-map blocks follows here 276 // embedded implementor of this interface follows here 277 // The embedded implementor only exists if the current klass is an 278 // iterface. The possible values of the implementor fall into following 279 // three cases: 280 // NULL: no implementor. 281 // A Klass* that's not itself: one implementor. 282 // Itself: more than one implementors. 283 // embedded host klass follows here 284 // The embedded host klass only exists in an anonymous class for 285 // dynamic language support (JSR 292 enabled). The host class grants 286 // its access privileges to this class also. The host class is either 287 // named, or a previously loaded anonymous class. A non-anonymous class 288 // or an anonymous class loaded through normal classloading does not 289 // have this embedded field. 290 // 291 292 friend class SystemDictionary; 293 294 public: 295 bool has_nonstatic_fields() const { 296 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 297 } 298 void set_has_nonstatic_fields(bool b) { 299 if (b) { 300 _misc_flags |= _misc_has_nonstatic_fields; 301 } else { 302 _misc_flags &= ~_misc_has_nonstatic_fields; 303 } 304 } 305 306 // field sizes 307 int nonstatic_field_size() const { return _nonstatic_field_size; } 308 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 309 310 int static_field_size() const { return _static_field_size; } 311 void set_static_field_size(int size) { _static_field_size = size; } 312 313 int static_oop_field_count() const { return (int)_static_oop_field_count; } 314 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 315 316 // Java itable 317 int itable_length() const { return _itable_len; } 318 void set_itable_length(int len) { _itable_len = len; } 319 bool has_itable_entries() const { return itable_length() > klassItable::empty_itable_size_in_words(); } 320 321 // array klasses 322 Klass* array_klasses() const { return _array_klasses; } 323 void set_array_klasses(Klass* k) { _array_klasses = k; } 324 325 // methods 326 Array<Method*>* methods() const { return _methods; } 327 void set_methods(Array<Method*>* a) { _methods = a; } 328 Method* method_with_idnum(int idnum); 329 Method* method_with_orig_idnum(int idnum); 330 Method* method_with_orig_idnum(int idnum, int version); 331 332 // method ordering 333 Array<int>* method_ordering() const { return _method_ordering; } 334 void set_method_ordering(Array<int>* m) { _method_ordering = m; } 335 void copy_method_ordering(const intArray* m, TRAPS); 336 337 // default_methods 338 Array<Method*>* default_methods() const { return _default_methods; } 339 void set_default_methods(Array<Method*>* a) { _default_methods = a; } 340 341 // default method vtable_indices 342 Array<int>* default_vtable_indices() const { return _default_vtable_indices; } 343 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; } 344 Array<int>* create_new_default_vtable_indices(int len, TRAPS); 345 346 // interfaces 347 Array<Klass*>* local_interfaces() const { return _local_interfaces; } 348 void set_local_interfaces(Array<Klass*>* a) { 349 guarantee(_local_interfaces == NULL || a == NULL, "Just checking"); 350 _local_interfaces = a; } 351 352 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; } 353 void set_transitive_interfaces(Array<Klass*>* a) { 354 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking"); 355 _transitive_interfaces = a; 356 } 357 358 static ByteSize transitive_interfaces_offset() { return in_ByteSize(offset_of(InstanceKlass, _transitive_interfaces)); } 359 360 private: 361 friend class fieldDescriptor; 362 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 363 364 public: 365 int field_offset (int index) const { return field(index)->offset(); } 366 int field_access_flags(int index) const { return field(index)->access_flags(); } 367 Symbol* field_name (int index) const { return field(index)->name(constants()); } 368 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 369 370 // Number of Java declared fields 371 int java_fields_count() const { return (int)_java_fields_count; } 372 373 Array<u2>* fields() const { return _fields; } 374 void set_fields(Array<u2>* f, u2 java_fields_count) { 375 guarantee(_fields == NULL || f == NULL, "Just checking"); 376 _fields = f; 377 _java_fields_count = java_fields_count; 378 } 379 380 // inner classes 381 Array<u2>* inner_classes() const { return _inner_classes; } 382 void set_inner_classes(Array<u2>* f) { _inner_classes = f; } 383 384 enum InnerClassAttributeOffset { 385 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 386 inner_class_inner_class_info_offset = 0, 387 inner_class_outer_class_info_offset = 1, 388 inner_class_inner_name_offset = 2, 389 inner_class_access_flags_offset = 3, 390 inner_class_next_offset = 4 391 }; 392 393 enum EnclosingMethodAttributeOffset { 394 enclosing_method_class_index_offset = 0, 395 enclosing_method_method_index_offset = 1, 396 enclosing_method_attribute_size = 2 397 }; 398 399 // method override check 400 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 401 402 // package 403 bool is_same_class_package(const Klass* class2) const; 404 bool is_same_class_package(oop classloader2, const Symbol* classname2) const; 405 static bool is_same_class_package(oop class_loader1, 406 const Symbol* class_name1, 407 oop class_loader2, 408 const Symbol* class_name2); 409 410 // find an enclosing class 411 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const { 412 return compute_enclosing_class_impl(this, inner_is_member, THREAD); 413 } 414 static InstanceKlass* compute_enclosing_class_impl(const InstanceKlass* self, 415 bool* inner_is_member, 416 TRAPS); 417 418 // Find InnerClasses attribute for k and return outer_class_info_index & inner_name_index. 419 static bool find_inner_classes_attr(instanceKlassHandle k, 420 int* ooff, int* noff, TRAPS); 421 422 // tell if two classes have the same enclosing class (at package level) 423 bool is_same_package_member(const Klass* class2, TRAPS) const { 424 return is_same_package_member_impl(this, class2, THREAD); 425 } 426 static bool is_same_package_member_impl(const InstanceKlass* self, 427 const Klass* class2, 428 TRAPS); 429 430 // initialization state 431 bool is_loaded() const { return _init_state >= loaded; } 432 bool is_linked() const { return _init_state >= linked; } 433 bool is_initialized() const { return _init_state == fully_initialized; } 434 bool is_not_initialized() const { return _init_state < being_initialized; } 435 bool is_being_initialized() const { return _init_state == being_initialized; } 436 bool is_in_error_state() const { return _init_state == initialization_error; } 437 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 438 ClassState init_state() { return (ClassState)_init_state; } 439 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 440 441 // defineClass specified verification 442 bool should_verify_class() const { 443 return (_misc_flags & _misc_should_verify_class) != 0; 444 } 445 void set_should_verify_class(bool value) { 446 if (value) { 447 _misc_flags |= _misc_should_verify_class; 448 } else { 449 _misc_flags &= ~_misc_should_verify_class; 450 } 451 } 452 453 // marking 454 bool is_marked_dependent() const { return _is_marked_dependent; } 455 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 456 457 // initialization (virtuals from Klass) 458 bool should_be_initialized() const; // means that initialize should be called 459 void initialize(TRAPS); 460 void link_class(TRAPS); 461 bool link_class_or_fail(TRAPS); // returns false on failure 462 void unlink_class(); 463 void rewrite_class(TRAPS); 464 void link_methods(TRAPS); 465 Method* class_initializer(); 466 467 // set the class to initialized if no static initializer is present 468 void eager_initialize(Thread *thread); 469 470 // reference type 471 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 472 void set_reference_type(ReferenceType t) { 473 assert(t == (u1)t, "overflow"); 474 _reference_type = (u1)t; 475 } 476 477 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); } 478 479 // find local field, returns true if found 480 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 481 // find field in direct superinterfaces, returns the interface in which the field is defined 482 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 483 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 484 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 485 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 486 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 487 488 // find a non-static or static field given its offset within the class. 489 bool contains_field_offset(int offset) { 490 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size(), is_value()); 491 } 492 493 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 494 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 495 496 // find a local method (returns NULL if not found) 497 Method* find_method(const Symbol* name, const Symbol* signature) const; 498 static Method* find_method(const Array<Method*>* methods, 499 const Symbol* name, 500 const Symbol* signature); 501 502 // find a local method, but skip static methods 503 Method* find_instance_method(const Symbol* name, const Symbol* signature) const; 504 static Method* find_instance_method(const Array<Method*>* methods, 505 const Symbol* name, 506 const Symbol* signature); 507 508 // find a local method (returns NULL if not found) 509 Method* find_local_method(const Symbol* name, 510 const Symbol* signature, 511 OverpassLookupMode overpass_mode, 512 StaticLookupMode static_mode, 513 PrivateLookupMode private_mode) const; 514 515 // find a local method from given methods array (returns NULL if not found) 516 static Method* find_local_method(const Array<Method*>* methods, 517 const Symbol* name, 518 const Symbol* signature, 519 OverpassLookupMode overpass_mode, 520 StaticLookupMode static_mode, 521 PrivateLookupMode private_mode); 522 523 // find a local method index in methods or default_methods (returns -1 if not found) 524 static int find_method_index(const Array<Method*>* methods, 525 const Symbol* name, 526 const Symbol* signature, 527 OverpassLookupMode overpass_mode, 528 StaticLookupMode static_mode, 529 PrivateLookupMode private_mode); 530 531 // lookup operation (returns NULL if not found) 532 Method* uncached_lookup_method(const Symbol* name, 533 const Symbol* signature, 534 OverpassLookupMode overpass_mode) const; 535 536 // lookup a method in all the interfaces that this class implements 537 // (returns NULL if not found) 538 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const; 539 540 // lookup a method in local defaults then in all interfaces 541 // (returns NULL if not found) 542 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const; 543 544 // Find method indices by name. If a method with the specified name is 545 // found the index to the first method is returned, and 'end' is filled in 546 // with the index of first non-name-matching method. If no method is found 547 // -1 is returned. 548 int find_method_by_name(const Symbol* name, int* end) const; 549 static int find_method_by_name(const Array<Method*>* methods, 550 const Symbol* name, int* end); 551 552 // constant pool 553 ConstantPool* constants() const { return _constants; } 554 void set_constants(ConstantPool* c) { _constants = c; } 555 556 // protection domain 557 oop protection_domain() const; 558 559 // signers 560 objArrayOop signers() const; 561 562 // host class 563 Klass* host_klass() const { 564 Klass** hk = (Klass**)adr_host_klass(); 565 if (hk == NULL) { 566 return NULL; 567 } else { 568 assert(*hk != NULL, "host klass should always be set if the address is not null"); 569 return *hk; 570 } 571 } 572 void set_host_klass(const Klass* host) { 573 assert(is_anonymous(), "not anonymous"); 574 const Klass** addr = (const Klass**)adr_host_klass(); 575 assert(addr != NULL, "no reversed space"); 576 if (addr != NULL) { 577 *addr = host; 578 } 579 } 580 bool is_anonymous() const { 581 return (_misc_flags & _misc_is_anonymous) != 0; 582 } 583 void set_is_anonymous(bool value) { 584 if (value) { 585 _misc_flags |= _misc_is_anonymous; 586 } else { 587 _misc_flags &= ~_misc_is_anonymous; 588 } 589 } 590 591 // Oop that keeps the metadata for this class from being unloaded 592 // in places where the metadata is stored in other places, like nmethods 593 oop klass_holder() const { 594 return is_anonymous() ? java_mirror() : class_loader(); 595 } 596 597 bool is_contended() const { 598 return (_misc_flags & _misc_is_contended) != 0; 599 } 600 void set_is_contended(bool value) { 601 if (value) { 602 _misc_flags |= _misc_is_contended; 603 } else { 604 _misc_flags &= ~_misc_is_contended; 605 } 606 } 607 608 // source file name 609 Symbol* source_file_name() const { 610 return (_source_file_name_index == 0) ? 611 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index); 612 } 613 u2 source_file_name_index() const { 614 return _source_file_name_index; 615 } 616 void set_source_file_name_index(u2 sourcefile_index) { 617 _source_file_name_index = sourcefile_index; 618 } 619 620 // minor and major version numbers of class file 621 u2 minor_version() const { return _minor_version; } 622 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 623 u2 major_version() const { return _major_version; } 624 void set_major_version(u2 major_version) { _major_version = major_version; } 625 626 // source debug extension 627 const char* source_debug_extension() const { return _source_debug_extension; } 628 void set_source_debug_extension(const char* array, int length); 629 630 // symbol unloading support (refcount already added) 631 Symbol* array_name() { return _array_name; } 632 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; } 633 634 // nonstatic oop-map blocks 635 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 636 return oop_map_count * OopMapBlock::size_in_words(); 637 } 638 unsigned int nonstatic_oop_map_count() const { 639 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 640 } 641 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 642 void set_nonstatic_oop_map_size(int words) { 643 _nonstatic_oop_map_size = words; 644 } 645 646 // RedefineClasses() support for previous versions: 647 void add_previous_version(instanceKlassHandle ikh, int emcp_method_count); 648 649 InstanceKlass* previous_versions() const { return _previous_versions; } 650 651 InstanceKlass* get_klass_version(int version) { 652 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) { 653 if (ik->constants()->version() == version) { 654 return ik; 655 } 656 } 657 return NULL; 658 } 659 660 bool has_been_redefined() const { 661 return (_misc_flags & _misc_has_been_redefined) != 0; 662 } 663 void set_has_been_redefined() { 664 _misc_flags |= _misc_has_been_redefined; 665 } 666 667 bool is_scratch_class() const { 668 return (_misc_flags & _misc_is_scratch_class) != 0; 669 } 670 671 void set_is_scratch_class() { 672 _misc_flags |= _misc_is_scratch_class; 673 } 674 675 private: 676 677 void set_kind(unsigned kind) { 678 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind"); 679 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos; 680 unsigned flags = _misc_flags & ~fmask; 681 _misc_flags = (flags | (kind << _misc_kind_field_pos)); 682 } 683 684 bool is_kind(unsigned desired) const { 685 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask; 686 return kind == desired; 687 } 688 689 public: 690 691 // Other is anything that is not one of the more specialized kinds of InstanceKlass. 692 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); } 693 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); } 694 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); } 695 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); } 696 697 void init_previous_versions() { 698 _previous_versions = NULL; 699 } 700 701 private: 702 static int _previous_version_count; 703 public: 704 static void purge_previous_versions(InstanceKlass* ik); 705 static bool has_previous_versions() { return _previous_version_count > 0; } 706 707 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 708 void set_cached_class_file(JvmtiCachedClassFileData *data) { 709 _cached_class_file = data; 710 } 711 JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; } 712 jint get_cached_class_file_len(); 713 unsigned char * get_cached_class_file_bytes(); 714 715 // JVMTI: Support for caching of field indices, types, and offsets 716 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 717 _jvmti_cached_class_field_map = descriptor; 718 } 719 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 720 return _jvmti_cached_class_field_map; 721 } 722 723 bool has_default_methods() const { 724 return (_misc_flags & _misc_has_default_methods) != 0; 725 } 726 void set_has_default_methods(bool b) { 727 if (b) { 728 _misc_flags |= _misc_has_default_methods; 729 } else { 730 _misc_flags &= ~_misc_has_default_methods; 731 } 732 } 733 734 bool declares_default_methods() const { 735 return (_misc_flags & _misc_declares_default_methods) != 0; 736 } 737 void set_declares_default_methods(bool b) { 738 if (b) { 739 _misc_flags |= _misc_declares_default_methods; 740 } else { 741 _misc_flags &= ~_misc_declares_default_methods; 742 } 743 } 744 745 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available 746 inline u2 next_method_idnum(); 747 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 748 749 // generics support 750 Symbol* generic_signature() const { 751 return (_generic_signature_index == 0) ? 752 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index); 753 } 754 u2 generic_signature_index() const { 755 return _generic_signature_index; 756 } 757 void set_generic_signature_index(u2 sig_index) { 758 _generic_signature_index = sig_index; 759 } 760 761 u2 enclosing_method_data(int offset) const; 762 u2 enclosing_method_class_index() const { 763 return enclosing_method_data(enclosing_method_class_index_offset); 764 } 765 u2 enclosing_method_method_index() { 766 return enclosing_method_data(enclosing_method_method_index_offset); 767 } 768 void set_enclosing_method_indices(u2 class_index, 769 u2 method_index); 770 771 // jmethodID support 772 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, 773 const methodHandle& method_h); 774 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h, 775 size_t idnum, jmethodID new_id, jmethodID* new_jmeths, 776 jmethodID* to_dealloc_id_p, 777 jmethodID** to_dealloc_jmeths_p); 778 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 779 size_t *length_p, jmethodID* id_p); 780 void ensure_space_for_methodids(int start_offset = 0); 781 jmethodID jmethod_id_or_null(Method* method); 782 783 // annotations support 784 Annotations* annotations() const { return _annotations; } 785 void set_annotations(Annotations* anno) { _annotations = anno; } 786 787 AnnotationArray* class_annotations() const { 788 return (_annotations != NULL) ? _annotations->class_annotations() : NULL; 789 } 790 Array<AnnotationArray*>* fields_annotations() const { 791 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL; 792 } 793 AnnotationArray* class_type_annotations() const { 794 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL; 795 } 796 Array<AnnotationArray*>* fields_type_annotations() const { 797 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL; 798 } 799 // allocation 800 instanceOop allocate_instance(TRAPS); 801 802 // additional member function to return a handle 803 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } 804 805 objArrayOop allocate_objArray(int n, int length, TRAPS); 806 // Helper function 807 static instanceOop register_finalizer(instanceOop i, TRAPS); 808 809 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 810 // if not, throw either an Error or an Exception. 811 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 812 813 // initialization 814 void call_class_initializer(TRAPS); 815 void set_initialization_state_and_notify(ClassState state, TRAPS); 816 817 // OopMapCache support 818 OopMapCache* oop_map_cache() { return _oop_map_cache; } 819 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 820 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry); 821 822 // JNI identifier support (for static fields - for jni performance) 823 JNIid* jni_ids() { return _jni_ids; } 824 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 825 JNIid* jni_id_for(int offset); 826 827 // maintenance of deoptimization dependencies 828 inline DependencyContext dependencies(); 829 int mark_dependent_nmethods(KlassDepChange& changes); 830 void add_dependent_nmethod(nmethod* nm); 831 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately); 832 833 // On-stack replacement support 834 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 835 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 836 void add_osr_nmethod(nmethod* n); 837 void remove_osr_nmethod(nmethod* n); 838 int mark_osr_nmethods(const Method* m); 839 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const; 840 841 // Breakpoint support (see methods on Method* for details) 842 BreakpointInfo* breakpoints() const { return _breakpoints; }; 843 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 844 845 // support for stub routines 846 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); } 847 TRACE_DEFINE_KLASS_TRACE_ID_OFFSET; 848 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); } 849 850 // subclass/subinterface checks 851 bool implements_interface(Klass* k, bool search_extras) const; 852 bool is_same_or_direct_interface(Klass* k) const; 853 854 #ifdef ASSERT 855 // check whether this class or one of its superclasses was redefined 856 bool has_redefined_this_or_super() const; 857 #endif 858 859 // Access to the implementor of an interface. 860 Klass* implementor() const 861 { 862 Klass** k = adr_implementor(); 863 if (k == NULL) { 864 return NULL; 865 } else { 866 return *k; 867 } 868 } 869 870 void set_implementor(Klass* k) { 871 assert(is_interface(), "not interface"); 872 Klass** addr = adr_implementor(); 873 assert(addr != NULL, "null addr"); 874 if (addr != NULL) { 875 *addr = k; 876 } 877 } 878 879 int nof_implementors() const { 880 Klass* k = implementor(); 881 if (k == NULL) { 882 return 0; 883 } else if (k != this) { 884 return 1; 885 } else { 886 return 2; 887 } 888 } 889 890 void add_implementor(Klass* k); // k is a new class that implements this interface 891 void init_implementor(); // initialize 892 893 // link this class into the implementors list of every interface it implements 894 void process_interfaces(Thread *thread); 895 896 // virtual operations from Klass 897 bool is_leaf_class() const { return _subklass == NULL; } 898 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); 899 bool compute_is_subtype_of(Klass* k); 900 bool can_be_primary_super_slow() const; 901 int oop_size(oop obj) const { return size_helper(); } 902 // slow because it's a virtual call and used for verifying the layout_helper. 903 // Using the layout_helper bits, we can call is_instance_klass without a virtual call. 904 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; }) 905 906 // Iterators 907 void do_local_static_fields(FieldClosure* cl); 908 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 909 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS); 910 911 void methods_do(void f(Method* method)); 912 void array_klasses_do(void f(Klass* k)); 913 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); 914 bool super_types_do(SuperTypeClosure* blk); 915 916 static InstanceKlass* cast(Klass* k) { 917 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k))); 918 } 919 920 static const InstanceKlass* cast(const Klass* k) { 921 assert(k != NULL, "k should not be null"); 922 assert(k->is_instance_klass(), "cast to InstanceKlass"); 923 return static_cast<const InstanceKlass*>(k); 924 } 925 926 InstanceKlass* java_super() const { 927 return (super() == NULL) ? NULL : cast(super()); 928 } 929 930 // Sizing (in words) 931 static int header_size() { return sizeof(InstanceKlass)/wordSize; } 932 933 static int size(int vtable_length, int itable_length, 934 int nonstatic_oop_map_size, 935 bool is_interface, bool is_anonymous) { 936 return align_metadata_size(header_size() + 937 vtable_length + 938 itable_length + 939 nonstatic_oop_map_size + 940 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) + 941 (is_anonymous ? (int)sizeof(Klass*)/wordSize : 0)); 942 } 943 int size() const { return size(vtable_length(), 944 itable_length(), 945 nonstatic_oop_map_size(), 946 is_interface(), 947 is_anonymous()); 948 } 949 #if INCLUDE_SERVICES 950 virtual void collect_statistics(KlassSizeStats *sz) const; 951 #endif 952 953 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); } 954 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 955 956 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; } 957 958 address static_field_addr(int offset); 959 960 bool bounds_check(address addr, bool edge_ok = false, intptr_t size_in_bytes = -1) const PRODUCT_RETURN0; 961 962 OopMapBlock* start_of_nonstatic_oop_maps() const { 963 return (OopMapBlock*)(start_of_itable() + itable_length()); 964 } 965 966 Klass** end_of_nonstatic_oop_maps() const { 967 return (Klass**)(start_of_nonstatic_oop_maps() + 968 nonstatic_oop_map_count()); 969 } 970 971 Klass** adr_implementor() const { 972 if (is_interface()) { 973 return (Klass**)end_of_nonstatic_oop_maps(); 974 } else { 975 return NULL; 976 } 977 }; 978 979 Klass** adr_host_klass() const { 980 if (is_anonymous()) { 981 Klass** adr_impl = adr_implementor(); 982 if (adr_impl != NULL) { 983 return adr_impl + 1; 984 } else { 985 return end_of_nonstatic_oop_maps(); 986 } 987 } else { 988 return NULL; 989 } 990 } 991 992 // Use this to return the size of an instance in heap words: 993 virtual int size_helper() const { 994 return layout_helper_to_size_helper(layout_helper()); 995 } 996 997 // This bit is initialized in classFileParser.cpp. 998 // It is false under any of the following conditions: 999 // - the class is abstract (including any interface) 1000 // - the class has a finalizer (if !RegisterFinalizersAtInit) 1001 // - the class size is larger than FastAllocateSizeLimit 1002 // - the class is java/lang/Class, which cannot be allocated directly 1003 bool can_be_fastpath_allocated() const { 1004 return !layout_helper_needs_slow_path(layout_helper()); 1005 } 1006 1007 // Java itable 1008 klassItable* itable() const; // return new klassItable wrapper 1009 Method* method_at_itable(Klass* holder, int index, TRAPS); 1010 1011 #if INCLUDE_JVMTI 1012 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed); 1013 #endif // INCLUDE_JVMTI 1014 1015 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive); 1016 void clean_implementors_list(BoolObjectClosure* is_alive); 1017 void clean_method_data(BoolObjectClosure* is_alive); 1018 1019 // Explicit metaspace deallocation of fields 1020 // For RedefineClasses and class file parsing errors, we need to deallocate 1021 // instanceKlasses and the metadata they point to. 1022 void deallocate_contents(ClassLoaderData* loader_data); 1023 static void deallocate_methods(ClassLoaderData* loader_data, 1024 Array<Method*>* methods); 1025 void static deallocate_interfaces(ClassLoaderData* loader_data, 1026 const Klass* super_klass, 1027 Array<Klass*>* local_interfaces, 1028 Array<Klass*>* transitive_interfaces); 1029 1030 // The constant pool is on stack if any of the methods are executing or 1031 // referenced by handles. 1032 bool on_stack() const { return _constants->on_stack(); } 1033 1034 // callbacks for actions during class unloading 1035 static void notify_unload_class(InstanceKlass* ik); 1036 static void release_C_heap_structures(InstanceKlass* ik); 1037 1038 // Naming 1039 const char* signature_name() const; 1040 1041 // GC specific object visitors 1042 // 1043 // Mark Sweep 1044 int oop_ms_adjust_pointers(oop obj); 1045 #if INCLUDE_ALL_GCS 1046 // Parallel Scavenge 1047 void oop_ps_push_contents( oop obj, PSPromotionManager* pm); 1048 // Parallel Compact 1049 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm); 1050 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm); 1051 #endif 1052 1053 // Oop fields (and metadata) iterators 1054 // [nv = true] Use non-virtual calls to do_oop_nv. 1055 // [nv = false] Use virtual calls to do_oop. 1056 // 1057 // The InstanceKlass iterators also visits the Object's klass. 1058 1059 // Forward iteration 1060 public: 1061 // Iterate over all oop fields in the oop maps. 1062 template <bool nv, class OopClosureType> 1063 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure); 1064 1065 protected: 1066 // Iterate over all oop fields and metadata. 1067 template <bool nv, class OopClosureType> 1068 inline int oop_oop_iterate(oop obj, OopClosureType* closure); 1069 1070 private: 1071 // Iterate over all oop fields in the oop maps. 1072 // Specialized for [T = oop] or [T = narrowOop]. 1073 template <bool nv, typename T, class OopClosureType> 1074 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure); 1075 1076 // Iterate over all oop fields in one oop map. 1077 template <bool nv, typename T, class OopClosureType> 1078 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure); 1079 1080 1081 // Reverse iteration 1082 #if INCLUDE_ALL_GCS 1083 public: 1084 // Iterate over all oop fields in the oop maps. 1085 template <bool nv, class OopClosureType> 1086 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure); 1087 1088 protected: 1089 // Iterate over all oop fields and metadata. 1090 template <bool nv, class OopClosureType> 1091 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure); 1092 1093 private: 1094 // Iterate over all oop fields in the oop maps. 1095 // Specialized for [T = oop] or [T = narrowOop]. 1096 template <bool nv, typename T, class OopClosureType> 1097 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure); 1098 1099 // Iterate over all oop fields in one oop map. 1100 template <bool nv, typename T, class OopClosureType> 1101 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure); 1102 #endif 1103 1104 1105 // Bounded range iteration 1106 public: 1107 // Iterate over all oop fields in the oop maps. 1108 template <bool nv, class OopClosureType> 1109 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1110 1111 protected: 1112 // Iterate over all oop fields and metadata. 1113 template <bool nv, class OopClosureType> 1114 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1115 1116 private: 1117 // Iterate over all oop fields in the oop maps. 1118 // Specialized for [T = oop] or [T = narrowOop]. 1119 template <bool nv, typename T, class OopClosureType> 1120 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr); 1121 1122 // Iterate over all oop fields in one oop map. 1123 template <bool nv, typename T, class OopClosureType> 1124 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr); 1125 1126 1127 public: 1128 1129 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL) 1130 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL) 1131 1132 #if INCLUDE_ALL_GCS 1133 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS) 1134 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS) 1135 #endif // INCLUDE_ALL_GCS 1136 1137 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 1138 1139 public: 1140 void set_in_error_state() { 1141 assert(DumpSharedSpaces, "only call this when dumping archive"); 1142 _init_state = initialization_error; 1143 } 1144 bool check_sharing_error_state(); 1145 1146 private: 1147 // initialization state 1148 #ifdef ASSERT 1149 void set_init_state(ClassState state); 1150 #else 1151 void set_init_state(ClassState state) { _init_state = (u1)state; } 1152 #endif 1153 void set_rewritten() { _misc_flags |= _misc_rewritten; } 1154 void set_init_thread(Thread *thread) { _init_thread = thread; } 1155 1156 // The RedefineClasses() API can cause new method idnums to be needed 1157 // which will cause the caches to grow. Safety requires different 1158 // cache management logic if the caches can grow instead of just 1159 // going from NULL to non-NULL. 1160 bool idnum_can_increment() const { return has_been_redefined(); } 1161 jmethodID* methods_jmethod_ids_acquire() const 1162 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); } 1163 void release_set_methods_jmethod_ids(jmethodID* jmeths) 1164 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); } 1165 1166 // Lock during initialization 1167 public: 1168 // Lock for (1) initialization; (2) access to the ConstantPool of this class. 1169 // Must be one per class and it has to be a VM internal object so java code 1170 // cannot lock it (like the mirror). 1171 // It has to be an object not a Mutex because it's held through java calls. 1172 oop init_lock() const; 1173 private: 1174 void fence_and_clear_init_lock(); 1175 1176 // Static methods that are used to implement member methods where an exposed this pointer 1177 // is needed due to possible GCs 1178 static bool link_class_impl (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS); 1179 static bool verify_code (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS); 1180 static void initialize_impl (instanceKlassHandle this_k, TRAPS); 1181 static void initialize_super_interfaces (instanceKlassHandle this_k, TRAPS); 1182 static void eager_initialize_impl (instanceKlassHandle this_k); 1183 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_k, ClassState state, TRAPS); 1184 static void call_class_initializer_impl (instanceKlassHandle this_k, TRAPS); 1185 static void do_local_static_fields_impl (instanceKlassHandle this_k, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS); 1186 /* jni_id_for_impl for jfieldID only */ 1187 static JNIid* jni_id_for_impl (instanceKlassHandle this_k, int offset); 1188 protected: 1189 // Returns the array class for the n'th dimension 1190 virtual Klass* array_klass_impl(bool or_null, int n, TRAPS); 1191 1192 // Returns the array class with this class as element type 1193 virtual Klass* array_klass_impl(bool or_null, TRAPS); 1194 1195 static Klass* array_klass_impl (instanceKlassHandle this_k, bool or_null, int n, TRAPS); 1196 private: 1197 // find a local method (returns NULL if not found) 1198 Method* find_method_impl(const Symbol* name, 1199 const Symbol* signature, 1200 OverpassLookupMode overpass_mode, 1201 StaticLookupMode static_mode, 1202 PrivateLookupMode private_mode) const; 1203 1204 static Method* find_method_impl(const Array<Method*>* methods, 1205 const Symbol* name, 1206 const Symbol* signature, 1207 OverpassLookupMode overpass_mode, 1208 StaticLookupMode static_mode, 1209 PrivateLookupMode private_mode); 1210 1211 // Free CHeap allocated fields. 1212 void release_C_heap_structures(); 1213 1214 // RedefineClasses support 1215 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; } 1216 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count); 1217 public: 1218 // CDS support - remove and restore oops from metadata. Oops are not shared. 1219 virtual void remove_unshareable_info(); 1220 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 1221 1222 // jvm support 1223 jint compute_modifier_flags(TRAPS) const; 1224 1225 // JSR-292 support 1226 MemberNameTable* member_names() { return _member_names; } 1227 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; } 1228 bool add_member_name(Handle member_name); 1229 1230 // EnableExtraSuper support 1231 static bool can_be_used_as_extra_super(AccessFlags access_flags, 1232 Array<Method*>* methods, 1233 bool has_default_methods, 1234 Array<Klass*>* transitive_interfaces); 1235 bool can_be_used_as_extra_super() const { 1236 return can_be_used_as_extra_super(_access_flags, 1237 _methods, 1238 has_default_methods(), 1239 _transitive_interfaces); 1240 } 1241 1242 // if an interface has itables, it (unusually) has an itable for itself 1243 bool has_self_itable() const { 1244 return (_misc_flags & _misc_has_self_itable) != 0; 1245 } 1246 void set_has_self_itable(bool b) { 1247 if (b) { 1248 _misc_flags |= _misc_has_self_itable; 1249 } else { 1250 _misc_flags &= ~_misc_has_self_itable; 1251 } 1252 } 1253 1254 1255 public: 1256 // JVMTI support 1257 jint jvmti_class_status() const; 1258 1259 public: 1260 // Printing 1261 #ifndef PRODUCT 1262 void print_on(outputStream* st) const; 1263 #endif 1264 void print_value_on(outputStream* st) const; 1265 1266 void oop_print_value_on(oop obj, outputStream* st); 1267 1268 #ifndef PRODUCT 1269 void oop_print_on (oop obj, outputStream* st); 1270 1271 void print_dependent_nmethods(bool verbose = false); 1272 bool is_dependent_nmethod(nmethod* nm); 1273 #endif 1274 1275 const char* internal_name() const; 1276 1277 // Verification 1278 void verify_on(outputStream* st); 1279 1280 void oop_verify_on(oop obj, outputStream* st); 1281 1282 // Logging 1283 void print_loading_log(LogLevel::type type, ClassLoaderData* loader_data, const ClassFileStream* cfs) const; 1284 }; 1285 1286 // for adding methods 1287 // UNSET_IDNUM return means no more ids available 1288 inline u2 InstanceKlass::next_method_idnum() { 1289 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) { 1290 return ConstMethod::UNSET_IDNUM; // no more ids available 1291 } else { 1292 return _idnum_allocated_count++; 1293 } 1294 } 1295 1296 1297 /* JNIid class for jfieldIDs only */ 1298 class JNIid: public CHeapObj<mtClass> { 1299 friend class VMStructs; 1300 private: 1301 Klass* _holder; 1302 JNIid* _next; 1303 int _offset; 1304 #ifdef ASSERT 1305 bool _is_static_field_id; 1306 #endif 1307 1308 public: 1309 // Accessors 1310 Klass* holder() const { return _holder; } 1311 int offset() const { return _offset; } 1312 JNIid* next() { return _next; } 1313 // Constructor 1314 JNIid(Klass* holder, int offset, JNIid* next); 1315 // Identifier lookup 1316 JNIid* find(int offset); 1317 1318 bool find_local_field(fieldDescriptor* fd) { 1319 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1320 } 1321 1322 static void deallocate(JNIid* id); 1323 // Debugging 1324 #ifdef ASSERT 1325 bool is_static_field_id() const { return _is_static_field_id; } 1326 void set_is_static_field_id() { _is_static_field_id = true; } 1327 #endif 1328 void verify(Klass* holder); 1329 }; 1330 1331 // An iterator that's used to access the inner classes indices in the 1332 // InstanceKlass::_inner_classes array. 1333 class InnerClassesIterator : public StackObj { 1334 private: 1335 Array<jushort>* _inner_classes; 1336 int _length; 1337 int _idx; 1338 public: 1339 1340 InnerClassesIterator(instanceKlassHandle k) { 1341 _inner_classes = k->inner_classes(); 1342 if (k->inner_classes() != NULL) { 1343 _length = _inner_classes->length(); 1344 // The inner class array's length should be the multiple of 1345 // inner_class_next_offset if it only contains the InnerClasses 1346 // attribute data, or it should be 1347 // n*inner_class_next_offset+enclosing_method_attribute_size 1348 // if it also contains the EnclosingMethod data. 1349 assert((_length % InstanceKlass::inner_class_next_offset == 0 || 1350 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size), 1351 "just checking"); 1352 // Remove the enclosing_method portion if exists. 1353 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) { 1354 _length -= InstanceKlass::enclosing_method_attribute_size; 1355 } 1356 } else { 1357 _length = 0; 1358 } 1359 _idx = 0; 1360 } 1361 1362 int length() const { 1363 return _length; 1364 } 1365 1366 void next() { 1367 _idx += InstanceKlass::inner_class_next_offset; 1368 } 1369 1370 bool done() const { 1371 return (_idx >= _length); 1372 } 1373 1374 u2 inner_class_info_index() const { 1375 return _inner_classes->at( 1376 _idx + InstanceKlass::inner_class_inner_class_info_offset); 1377 } 1378 1379 void set_inner_class_info_index(u2 index) { 1380 _inner_classes->at_put( 1381 _idx + InstanceKlass::inner_class_inner_class_info_offset, index); 1382 } 1383 1384 u2 outer_class_info_index() const { 1385 return _inner_classes->at( 1386 _idx + InstanceKlass::inner_class_outer_class_info_offset); 1387 } 1388 1389 void set_outer_class_info_index(u2 index) { 1390 _inner_classes->at_put( 1391 _idx + InstanceKlass::inner_class_outer_class_info_offset, index); 1392 } 1393 1394 u2 inner_name_index() const { 1395 return _inner_classes->at( 1396 _idx + InstanceKlass::inner_class_inner_name_offset); 1397 } 1398 1399 void set_inner_name_index(u2 index) { 1400 _inner_classes->at_put( 1401 _idx + InstanceKlass::inner_class_inner_name_offset, index); 1402 } 1403 1404 u2 inner_access_flags() const { 1405 return _inner_classes->at( 1406 _idx + InstanceKlass::inner_class_access_flags_offset); 1407 } 1408 }; 1409 1410 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP