1 /* 2 * Copyright (c) 1997, 2014, 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 "memory/referenceType.hpp" 29 #include "oops/constMethodOop.hpp" 30 #include "oops/constantPoolOop.hpp" 31 #include "oops/fieldInfo.hpp" 32 #include "oops/instanceOop.hpp" 33 #include "oops/klassOop.hpp" 34 #include "oops/klassVtable.hpp" 35 #include "oops/objArrayOop.hpp" 36 #include "runtime/atomic.hpp" 37 #include "runtime/handles.hpp" 38 #include "runtime/os.hpp" 39 #include "utilities/accessFlags.hpp" 40 #include "utilities/bitMap.inline.hpp" 41 #include "trace/traceMacros.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 layout: 47 // [header ] klassOop 48 // [klass pointer ] klassOop 49 // [C++ vtbl pointer ] Klass 50 // [subtype cache ] Klass 51 // [instance size ] Klass 52 // [java mirror ] Klass 53 // [super ] Klass 54 // [access_flags ] Klass 55 // [name ] Klass 56 // [first subklass ] Klass 57 // [next sibling ] Klass 58 // [array klasses ] 59 // [methods ] 60 // [local interfaces ] 61 // [transitive interfaces ] 62 // [fields ] 63 // [constants ] 64 // [class loader ] 65 // [protection domain ] 66 // [signers ] 67 // [source file name ] 68 // [inner classes ] 69 // [static field size ] 70 // [nonstatic field size ] 71 // [static oop fields size ] 72 // [nonstatic oop maps size ] 73 // [has finalize method ] 74 // [deoptimization mark bit ] 75 // [initialization state ] 76 // [initializing thread ] 77 // [Java vtable length ] 78 // [oop map cache (stack maps) ] 79 // [EMBEDDED Java vtable ] size in words = vtable_len 80 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size 81 // The embedded nonstatic oop-map blocks are short pairs (offset, length) 82 // indicating where oops are located in instances of this klass. 83 // [EMBEDDED implementor of the interface] only exist for interface 84 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled) 85 86 87 // forward declaration for class -- see below for definition 88 class SuperTypeClosure; 89 class JNIid; 90 class jniIdMapBase; 91 class BreakpointInfo; 92 class fieldDescriptor; 93 class DepChange; 94 class nmethodBucket; 95 class PreviousVersionNode; 96 class JvmtiCachedClassFieldMap; 97 class MemberNameTable; 98 99 // This is used in iterators below. 100 class FieldClosure: public StackObj { 101 public: 102 virtual void do_field(fieldDescriptor* fd) = 0; 103 }; 104 105 #ifndef PRODUCT 106 // Print fields. 107 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. 108 class FieldPrinter: public FieldClosure { 109 oop _obj; 110 outputStream* _st; 111 public: 112 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} 113 void do_field(fieldDescriptor* fd); 114 }; 115 #endif // !PRODUCT 116 117 // ValueObjs embedded in klass. Describes where oops are located in instances of 118 // this klass. 119 class OopMapBlock VALUE_OBJ_CLASS_SPEC { 120 public: 121 // Byte offset of the first oop mapped by this block. 122 int offset() const { return _offset; } 123 void set_offset(int offset) { _offset = offset; } 124 125 // Number of oops in this block. 126 uint count() const { return _count; } 127 void set_count(uint count) { _count = count; } 128 129 // sizeof(OopMapBlock) in HeapWords. 130 static const int size_in_words() { 131 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >> 132 LogHeapWordSize; 133 } 134 135 private: 136 int _offset; 137 uint _count; 138 }; 139 140 class instanceKlass: public Klass { 141 friend class VMStructs; 142 public: 143 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description 144 // of the class loading & initialization procedure, and the use of the states. 145 enum ClassState { 146 unparsable_by_gc = 0, // object is not yet parsable by gc. Value of _init_state at object allocation. 147 allocated, // allocated (but not yet linked) 148 loaded, // loaded and inserted in class hierarchy (but not linked yet) 149 linked, // successfully linked/verified (but not initialized yet) 150 being_initialized, // currently running class initializer 151 fully_initialized, // initialized (successfull final state) 152 initialization_error // error happened during initialization 153 }; 154 155 public: 156 oop* oop_block_beg() const { return adr_array_klasses(); } 157 oop* oop_block_end() const { return adr_methods_default_annotations() + 1; } 158 159 static int number_of_instance_classes() { return _total_instanceKlass_count; } 160 161 private: 162 static volatile int _total_instanceKlass_count; 163 164 protected: 165 // 166 // The oop block. See comment in klass.hpp before making changes. 167 // 168 169 // Array classes holding elements of this class. 170 klassOop _array_klasses; 171 // Method array. 172 objArrayOop _methods; 173 // Int array containing the original order of method in the class file (for 174 // JVMTI). 175 typeArrayOop _method_ordering; 176 // Interface (klassOops) this class declares locally to implement. 177 objArrayOop _local_interfaces; 178 // Interface (klassOops) this class implements transitively. 179 objArrayOop _transitive_interfaces; 180 // Instance and static variable information, starts with 6-tuples of shorts 181 // [access, name index, sig index, initval index, low_offset, high_offset] 182 // for all fields, followed by the generic signature data at the end of 183 // the array. Only fields with generic signature attributes have the generic 184 // signature data set in the array. The fields array looks like following: 185 // 186 // f1: [access, name index, sig index, initial value index, low_offset, high_offset] 187 // f2: [access, name index, sig index, initial value index, low_offset, high_offset] 188 // ... 189 // fn: [access, name index, sig index, initial value index, low_offset, high_offset] 190 // [generic signature index] 191 // [generic signature index] 192 // ... 193 typeArrayOop _fields; 194 // Constant pool for this class. 195 constantPoolOop _constants; 196 // Class loader used to load this class, NULL if VM loader used. 197 oop _class_loader; 198 // Protection domain. 199 oop _protection_domain; 200 // Class signers. 201 objArrayOop _signers; 202 // The InnerClasses attribute and EnclosingMethod attribute. The 203 // _inner_classes is an array of shorts. If the class has InnerClasses 204 // attribute, then the _inner_classes array begins with 4-tuples of shorts 205 // [inner_class_info_index, outer_class_info_index, 206 // inner_name_index, inner_class_access_flags] for the InnerClasses 207 // attribute. If the EnclosingMethod attribute exists, it occupies the 208 // last two shorts [class_index, method_index] of the array. If only 209 // the InnerClasses attribute exists, the _inner_classes array length is 210 // number_of_inner_classes * 4. If the class has both InnerClasses 211 // and EnclosingMethod attributes the _inner_classes array length is 212 // number_of_inner_classes * 4 + enclosing_method_attribute_size. 213 typeArrayOop _inner_classes; 214 // Annotations for this class, or null if none. 215 typeArrayOop _class_annotations; 216 // Annotation objects (byte arrays) for fields, or null if no annotations. 217 // Indices correspond to entries (not indices) in fields array. 218 objArrayOop _fields_annotations; 219 // Annotation objects (byte arrays) for methods, or null if no annotations. 220 // Index is the idnum, which is initially the same as the methods array index. 221 objArrayOop _methods_annotations; 222 // Annotation objects (byte arrays) for methods' parameters, or null if no 223 // such annotations. 224 // Index is the idnum, which is initially the same as the methods array index. 225 objArrayOop _methods_parameter_annotations; 226 // Annotation objects (byte arrays) for methods' default values, or null if no 227 // such annotations. 228 // Index is the idnum, which is initially the same as the methods array index. 229 objArrayOop _methods_default_annotations; 230 231 // 232 // End of the oop block. 233 // 234 235 // Name of source file containing this klass, NULL if not specified. 236 Symbol* _source_file_name; 237 // the source debug extension for this klass, NULL if not specified. 238 // Specified as UTF-8 string without terminating zero byte in the classfile, 239 // it is stored in the instanceklass as a NULL-terminated UTF-8 string 240 char* _source_debug_extension; 241 // Generic signature, or null if none. 242 Symbol* _generic_signature; 243 // Array name derived from this class which needs unreferencing 244 // if this class is unloaded. 245 Symbol* _array_name; 246 247 // Number of heapOopSize words used by non-static fields in this klass 248 // (including inherited fields but after header_size()). 249 int _nonstatic_field_size; 250 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass 251 u2 _static_oop_field_count;// number of static oop fields in this klass 252 u2 _java_fields_count; // The number of declared Java fields 253 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks 254 255 bool _is_marked_dependent; // used for marking during flushing and deoptimization 256 enum { 257 _misc_rewritten = 1 << 0, // methods rewritten. 258 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops 259 _misc_should_verify_class = 1 << 2, // allow caching of preverification 260 _misc_is_anonymous = 1 << 3 // has embedded _inner_classes field 261 }; 262 u2 _misc_flags; 263 u2 _minor_version; // minor version number of class file 264 u2 _major_version; // major version number of class file 265 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) 266 int _vtable_len; // length of Java vtable (in words) 267 int _itable_len; // length of Java itable (in words) 268 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) 269 MemberNameTable* _member_names; // Member names 270 JNIid* _jni_ids; // First JNI identifier for static fields in this class 271 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none 272 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL 273 nmethodBucket* _dependencies; // list of dependent nmethods 274 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class 275 BreakpointInfo* _breakpoints; // bpt lists, managed by methodOop 276 // Array of interesting part(s) of the previous version(s) of this 277 // instanceKlass. See PreviousVersionWalker below. 278 GrowableArray<PreviousVersionNode *>* _previous_versions; 279 // JVMTI fields can be moved to their own structure - see 6315920 280 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH 281 jint _cached_class_file_len; // JVMTI: length of above 282 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration 283 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change 284 285 // Class states are defined as ClassState (see above). 286 // Place the _init_state here to utilize the unused 2-byte after 287 // _idnum_allocated_count. 288 u1 _init_state; // state of class 289 290 u1 _reference_type; // reference type 291 292 // embedded Java vtable follows here 293 // embedded Java itables follows here 294 // embedded static fields follows here 295 // embedded nonstatic oop-map blocks follows here 296 // embedded implementor of this interface follows here 297 // The embedded implementor only exists if the current klass is an 298 // iterface. The possible values of the implementor fall into following 299 // three cases: 300 // NULL: no implementor. 301 // A klassOop that's not itself: one implementor. 302 // Itsef: more than one implementors. 303 // embedded host klass follows here 304 // The embedded host klass only exists in an anonymous class for 305 // dynamic language support (JSR 292 enabled). The host class grants 306 // its access privileges to this class also. The host class is either 307 // named, or a previously loaded anonymous class. A non-anonymous class 308 // or an anonymous class loaded through normal classloading does not 309 // have this embedded field. 310 // 311 312 friend class instanceKlassKlass; 313 friend class SystemDictionary; 314 315 public: 316 bool has_nonstatic_fields() const { 317 return (_misc_flags & _misc_has_nonstatic_fields) != 0; 318 } 319 void set_has_nonstatic_fields(bool b) { 320 if (b) { 321 _misc_flags |= _misc_has_nonstatic_fields; 322 } else { 323 _misc_flags &= ~_misc_has_nonstatic_fields; 324 } 325 } 326 327 // field sizes 328 int nonstatic_field_size() const { return _nonstatic_field_size; } 329 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } 330 331 int static_field_size() const { return _static_field_size; } 332 void set_static_field_size(int size) { _static_field_size = size; } 333 334 int static_oop_field_count() const { return (int)_static_oop_field_count; } 335 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; } 336 337 // Java vtable 338 int vtable_length() const { return _vtable_len; } 339 void set_vtable_length(int len) { _vtable_len = len; } 340 341 // Java itable 342 int itable_length() const { return _itable_len; } 343 void set_itable_length(int len) { _itable_len = len; } 344 345 // array klasses 346 klassOop array_klasses() const { return _array_klasses; } 347 void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); } 348 349 // methods 350 objArrayOop methods() const { return _methods; } 351 void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); } 352 methodOop method_with_idnum(int idnum); 353 354 // method ordering 355 typeArrayOop method_ordering() const { return _method_ordering; } 356 void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); } 357 358 // interfaces 359 objArrayOop local_interfaces() const { return _local_interfaces; } 360 void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); } 361 objArrayOop transitive_interfaces() const { return _transitive_interfaces; } 362 void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); } 363 364 private: 365 friend class fieldDescriptor; 366 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); } 367 368 public: 369 int field_offset (int index) const { return field(index)->offset(); } 370 int field_access_flags(int index) const { return field(index)->access_flags(); } 371 Symbol* field_name (int index) const { return field(index)->name(constants()); } 372 Symbol* field_signature (int index) const { return field(index)->signature(constants()); } 373 374 // Number of Java declared fields 375 int java_fields_count() const { return (int)_java_fields_count; } 376 377 typeArrayOop fields() const { return _fields; } 378 379 void set_fields(typeArrayOop f, u2 java_fields_count) { 380 oop_store_without_check((oop*) &_fields, (oop) f); 381 _java_fields_count = java_fields_count; 382 } 383 384 // inner classes 385 typeArrayOop inner_classes() const { return _inner_classes; } 386 void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) f); } 387 388 enum InnerClassAttributeOffset { 389 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 390 inner_class_inner_class_info_offset = 0, 391 inner_class_outer_class_info_offset = 1, 392 inner_class_inner_name_offset = 2, 393 inner_class_access_flags_offset = 3, 394 inner_class_next_offset = 4 395 }; 396 397 enum EnclosingMethodAttributeOffset { 398 enclosing_method_class_index_offset = 0, 399 enclosing_method_method_index_offset = 1, 400 enclosing_method_attribute_size = 2 401 }; 402 403 // method override check 404 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); 405 406 // package 407 bool is_same_class_package(klassOop class2); 408 bool is_same_class_package(oop classloader2, Symbol* classname2); 409 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2); 410 411 // find an enclosing class (defined where original code was, in jvm.cpp!) 412 klassOop compute_enclosing_class(bool* inner_is_member, TRAPS) { 413 instanceKlassHandle self(THREAD, this->as_klassOop()); 414 return compute_enclosing_class_impl(self, inner_is_member, THREAD); 415 } 416 static klassOop compute_enclosing_class_impl(instanceKlassHandle self, 417 bool* inner_is_member, TRAPS); 418 419 // tell if two classes have the same enclosing class (at package level) 420 bool is_same_package_member(klassOop class2, TRAPS) { 421 instanceKlassHandle self(THREAD, this->as_klassOop()); 422 return is_same_package_member_impl(self, class2, THREAD); 423 } 424 static bool is_same_package_member_impl(instanceKlassHandle self, 425 klassOop class2, TRAPS); 426 427 // initialization state 428 bool is_loaded() const { return _init_state >= loaded; } 429 bool is_linked() const { return _init_state >= linked; } 430 bool is_initialized() const { return _init_state == fully_initialized; } 431 bool is_not_initialized() const { return _init_state < being_initialized; } 432 bool is_being_initialized() const { return _init_state == being_initialized; } 433 bool is_in_error_state() const { return _init_state == initialization_error; } 434 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } 435 ClassState init_state() { return (ClassState)_init_state; } 436 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; } 437 438 // defineClass specified verification 439 bool should_verify_class() const { 440 return (_misc_flags & _misc_should_verify_class) != 0; 441 } 442 void set_should_verify_class(bool value) { 443 if (value) { 444 _misc_flags |= _misc_should_verify_class; 445 } else { 446 _misc_flags &= ~_misc_should_verify_class; 447 } 448 } 449 450 // marking 451 bool is_marked_dependent() const { return _is_marked_dependent; } 452 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } 453 454 // initialization (virtuals from Klass) 455 bool should_be_initialized() const; // means that initialize should be called 456 void initialize(TRAPS); 457 void link_class(TRAPS); 458 bool link_class_or_fail(TRAPS); // returns false on failure 459 void unlink_class(); 460 void rewrite_class(TRAPS); 461 void relocate_and_link_methods(TRAPS); 462 methodOop class_initializer(); 463 464 // set the class to initialized if no static initializer is present 465 void eager_initialize(Thread *thread); 466 467 // reference type 468 ReferenceType reference_type() const { return (ReferenceType)_reference_type; } 469 void set_reference_type(ReferenceType t) { 470 assert(t == (u1)t, "overflow"); 471 _reference_type = (u1)t; 472 } 473 474 static ByteSize reference_type_offset() { return in_ByteSize(sizeof(klassOopDesc) + offset_of(instanceKlass, _reference_type)); } 475 476 // find local field, returns true if found 477 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 478 // find field in direct superinterfaces, returns the interface in which the field is defined 479 klassOop find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 480 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined 481 klassOop find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; 482 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined 483 klassOop find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; 484 485 // find a non-static or static field given its offset within the class. 486 bool contains_field_offset(int offset) { 487 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); 488 } 489 490 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 491 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; 492 493 // find a local method (returns NULL if not found) 494 methodOop find_method(Symbol* name, Symbol* signature) const; 495 static methodOop find_method(objArrayOop methods, Symbol* name, Symbol* signature); 496 497 // lookup operation (returns NULL if not found) 498 methodOop uncached_lookup_method(Symbol* name, Symbol* signature) const; 499 500 // lookup a method in all the interfaces that this class implements 501 // (returns NULL if not found) 502 methodOop lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const; 503 504 // constant pool 505 constantPoolOop constants() const { return _constants; } 506 void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); } 507 508 // class loader 509 oop class_loader() const { return _class_loader; } 510 void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); } 511 512 // protection domain 513 oop protection_domain() { return _protection_domain; } 514 void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); } 515 516 // host class 517 oop host_klass() const { 518 oop* hk = adr_host_klass(); 519 if (hk == NULL) { 520 return NULL; 521 } else { 522 return *hk; 523 } 524 } 525 void set_host_klass(oop host) { 526 assert(is_anonymous(), "not anonymous"); 527 oop* addr = adr_host_klass(); 528 assert(addr != NULL, "no reversed space"); 529 oop_store(addr, host); 530 } 531 bool is_anonymous() const { 532 return (_misc_flags & _misc_is_anonymous) != 0; 533 } 534 void set_is_anonymous(bool value) { 535 if (value) { 536 _misc_flags |= _misc_is_anonymous; 537 } else { 538 _misc_flags &= ~_misc_is_anonymous; 539 } 540 } 541 542 // signers 543 objArrayOop signers() const { return _signers; } 544 void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); } 545 546 // source file name 547 Symbol* source_file_name() const { return _source_file_name; } 548 void set_source_file_name(Symbol* n); 549 550 // minor and major version numbers of class file 551 u2 minor_version() const { return _minor_version; } 552 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } 553 u2 major_version() const { return _major_version; } 554 void set_major_version(u2 major_version) { _major_version = major_version; } 555 556 // source debug extension 557 char* source_debug_extension() const { return _source_debug_extension; } 558 void set_source_debug_extension(char* array, int length); 559 560 // symbol unloading support (refcount already added) 561 Symbol* array_name() { return _array_name; } 562 void set_array_name(Symbol* name) { assert(_array_name == NULL, "name already created"); _array_name = name; } 563 564 // nonstatic oop-map blocks 565 static int nonstatic_oop_map_size(unsigned int oop_map_count) { 566 return oop_map_count * OopMapBlock::size_in_words(); 567 } 568 unsigned int nonstatic_oop_map_count() const { 569 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); 570 } 571 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } 572 void set_nonstatic_oop_map_size(int words) { 573 _nonstatic_oop_map_size = words; 574 } 575 576 // RedefineClasses() support for previous versions: 577 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods, 578 int emcp_method_count); 579 // If the _previous_versions array is non-NULL, then this klass 580 // has been redefined at least once even if we aren't currently 581 // tracking a previous version. 582 bool has_been_redefined() const { return _previous_versions != NULL; } 583 bool has_previous_version() const; 584 void init_previous_versions() { 585 _previous_versions = NULL; 586 } 587 GrowableArray<PreviousVersionNode *>* previous_versions() const { 588 return _previous_versions; 589 } 590 591 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation 592 void set_cached_class_file(unsigned char *class_file_bytes, 593 jint class_file_len) { _cached_class_file_len = class_file_len; 594 _cached_class_file_bytes = class_file_bytes; } 595 jint get_cached_class_file_len() { return _cached_class_file_len; } 596 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; } 597 598 // JVMTI: Support for caching of field indices, types, and offsets 599 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { 600 _jvmti_cached_class_field_map = descriptor; 601 } 602 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { 603 return _jvmti_cached_class_field_map; 604 } 605 606 // for adding methods, constMethodOopDesc::UNSET_IDNUM means no more ids available 607 inline u2 next_method_idnum(); 608 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } 609 610 // generics support 611 Symbol* generic_signature() const { return _generic_signature; } 612 void set_generic_signature(Symbol* sig) { _generic_signature = sig; } 613 614 u2 enclosing_method_data(int offset); 615 u2 enclosing_method_class_index() { 616 return enclosing_method_data(enclosing_method_class_index_offset); 617 } 618 u2 enclosing_method_method_index() { 619 return enclosing_method_data(enclosing_method_method_index_offset); 620 } 621 void set_enclosing_method_indices(u2 class_index, 622 u2 method_index); 623 624 // jmethodID support 625 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, 626 methodHandle method_h); 627 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h, 628 size_t idnum, jmethodID new_id, jmethodID* new_jmeths, 629 jmethodID* to_dealloc_id_p, 630 jmethodID** to_dealloc_jmeths_p); 631 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, 632 size_t *length_p, jmethodID* id_p); 633 jmethodID jmethod_id_or_null(methodOop method); 634 635 // cached itable index support 636 void set_cached_itable_index(size_t idnum, int index); 637 int cached_itable_index(size_t idnum); 638 639 // annotations support 640 typeArrayOop class_annotations() const { return _class_annotations; } 641 objArrayOop fields_annotations() const { return _fields_annotations; } 642 objArrayOop methods_annotations() const { return _methods_annotations; } 643 objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; } 644 objArrayOop methods_default_annotations() const { return _methods_default_annotations; } 645 void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); } 646 void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); } 647 void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); } 648 void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); } 649 void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); } 650 typeArrayOop get_method_annotations_of(int idnum) 651 { return get_method_annotations_from(idnum, _methods_annotations); } 652 typeArrayOop get_method_parameter_annotations_of(int idnum) 653 { return get_method_annotations_from(idnum, _methods_parameter_annotations); } 654 typeArrayOop get_method_default_annotations_of(int idnum) 655 { return get_method_annotations_from(idnum, _methods_default_annotations); } 656 void set_method_annotations_of(int idnum, typeArrayOop anno) 657 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } 658 void set_method_parameter_annotations_of(int idnum, typeArrayOop anno) 659 { set_methods_annotations_of(idnum, anno, &_methods_parameter_annotations); } 660 void set_method_default_annotations_of(int idnum, typeArrayOop anno) 661 { set_methods_annotations_of(idnum, anno, &_methods_default_annotations); } 662 663 // allocation 664 DEFINE_ALLOCATE_PERMANENT(instanceKlass); 665 instanceOop allocate_instance(TRAPS); 666 instanceOop allocate_permanent_instance(TRAPS); 667 668 // additional member function to return a handle 669 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } 670 671 objArrayOop allocate_objArray(int n, int length, TRAPS); 672 // Helper function 673 static instanceOop register_finalizer(instanceOop i, TRAPS); 674 675 // Check whether reflection/jni/jvm code is allowed to instantiate this class; 676 // if not, throw either an Error or an Exception. 677 virtual void check_valid_for_instantiation(bool throwError, TRAPS); 678 679 // initialization 680 void call_class_initializer(TRAPS); 681 void set_initialization_state_and_notify(ClassState state, TRAPS); 682 683 // OopMapCache support 684 OopMapCache* oop_map_cache() { return _oop_map_cache; } 685 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } 686 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry); 687 688 // JNI identifier support (for static fields - for jni performance) 689 JNIid* jni_ids() { return _jni_ids; } 690 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } 691 JNIid* jni_id_for(int offset); 692 693 // maintenance of deoptimization dependencies 694 int mark_dependent_nmethods(DepChange& changes); 695 void add_dependent_nmethod(nmethod* nm); 696 void remove_dependent_nmethod(nmethod* nm); 697 698 // On-stack replacement support 699 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; 700 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; 701 void add_osr_nmethod(nmethod* n); 702 void remove_osr_nmethod(nmethod* n); 703 nmethod* lookup_osr_nmethod(const methodOop m, int bci, int level, bool match_level) const; 704 705 // Breakpoint support (see methods on methodOop for details) 706 BreakpointInfo* breakpoints() const { return _breakpoints; }; 707 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; 708 709 // support for stub routines 710 static ByteSize init_state_offset() { return in_ByteSize(sizeof(klassOopDesc) + offset_of(instanceKlass, _init_state)); } 711 TRACE_DEFINE_OFFSET; 712 static ByteSize init_thread_offset() { return in_ByteSize(sizeof(klassOopDesc) + offset_of(instanceKlass, _init_thread)); } 713 714 // subclass/subinterface checks 715 bool implements_interface(klassOop k) const; 716 717 // Access to the implementor of an interface. 718 klassOop implementor() const 719 { 720 klassOop* k = (klassOop*)adr_implementor(); 721 if (k == NULL) { 722 return NULL; 723 } else { 724 return *k; 725 } 726 } 727 728 void set_implementor(klassOop k) { 729 assert(is_interface(), "not interface"); 730 oop* addr = adr_implementor(); 731 oop_store_without_check(addr, k); 732 } 733 734 int nof_implementors() const { 735 klassOop k = implementor(); 736 if (k == NULL) { 737 return 0; 738 } else if (k != this->as_klassOop()) { 739 return 1; 740 } else { 741 return 2; 742 } 743 } 744 745 void add_implementor(klassOop k); // k is a new class that implements this interface 746 void init_implementor(); // initialize 747 748 // link this class into the implementors list of every interface it implements 749 void process_interfaces(Thread *thread); 750 751 // virtual operations from Klass 752 bool is_leaf_class() const { return _subklass == NULL; } 753 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS); 754 bool compute_is_subtype_of(klassOop k); 755 bool can_be_primary_super_slow() const; 756 klassOop java_super() const { return super(); } 757 int oop_size(oop obj) const { return size_helper(); } 758 int klass_oop_size() const { return object_size(); } 759 bool oop_is_instance_slow() const { return true; } 760 761 // Iterators 762 void do_local_static_fields(FieldClosure* cl); 763 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields 764 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS); 765 766 void methods_do(void f(methodOop method)); 767 void array_klasses_do(void f(klassOop k)); 768 void with_array_klasses_do(void f(klassOop k)); 769 bool super_types_do(SuperTypeClosure* blk); 770 771 // Casting from klassOop 772 static instanceKlass* cast(klassOop k) { 773 assert(k->is_klass(), "must be"); 774 Klass* kp = k->klass_part(); 775 assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass"); 776 return (instanceKlass*) kp; 777 } 778 779 // Sizing (in words) 780 static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); } 781 782 int object_size() const 783 { 784 int vtable_size = align_object_offset(vtable_length()); 785 int itable_size = align_object_offset(itable_length()); 786 int aligned_nonstatic_oop_map_size = is_interface() || is_anonymous() ? 787 align_object_offset(nonstatic_oop_map_size()) : 788 nonstatic_oop_map_size(); 789 int interface_implementor_size = is_interface() ? (int) sizeof(klassOop) / HeapWordSize : 0; 790 int host_klass_size = is_anonymous() ? (int) sizeof(klassOop) / HeapWordSize : 0; 791 792 return object_size(vtable_size + itable_size + aligned_nonstatic_oop_map_size + 793 interface_implementor_size + host_klass_size); 794 } 795 static int vtable_start_offset() { return header_size(); } 796 static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; } 797 static int object_size(int extra) { return align_object_size(header_size() + extra); } 798 799 intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + vtable_start_offset(); } 800 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); } 801 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)as_klassOop(); } 802 803 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } 804 805 address static_field_addr(int offset); 806 807 OopMapBlock* start_of_nonstatic_oop_maps() const { 808 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length())); 809 } 810 811 oop* adr_implementor() const { 812 if (is_interface()) { 813 return (oop*)(start_of_nonstatic_oop_maps() + 814 nonstatic_oop_map_count()); 815 } else { 816 return NULL; 817 } 818 }; 819 820 oop* adr_host_klass() const { 821 if (is_anonymous()) { 822 oop* adr_impl = adr_implementor(); 823 if (adr_impl != NULL) { 824 return adr_impl + 1; 825 } else { 826 return (oop*)(start_of_nonstatic_oop_maps() + 827 nonstatic_oop_map_count()); 828 } 829 } else { 830 return NULL; 831 } 832 } 833 834 // Allocation profiling support 835 juint alloc_size() const { return _alloc_count * size_helper(); } 836 void set_alloc_size(juint n) {} 837 838 // Use this to return the size of an instance in heap words: 839 int size_helper() const { 840 return layout_helper_to_size_helper(layout_helper()); 841 } 842 843 // This bit is initialized in classFileParser.cpp. 844 // It is false under any of the following conditions: 845 // - the class is abstract (including any interface) 846 // - the class has a finalizer (if !RegisterFinalizersAtInit) 847 // - the class size is larger than FastAllocateSizeLimit 848 // - the class is java/lang/Class, which cannot be allocated directly 849 bool can_be_fastpath_allocated() const { 850 return !layout_helper_needs_slow_path(layout_helper()); 851 } 852 853 // Java vtable/itable 854 klassVtable* vtable() const; // return new klassVtable wrapper 855 inline methodOop method_at_vtable(int index); 856 klassItable* itable() const; // return new klassItable wrapper 857 methodOop method_at_itable(klassOop holder, int index, TRAPS); 858 859 // Garbage collection 860 void oop_follow_contents(oop obj); 861 int oop_adjust_pointers(oop obj); 862 bool object_is_parsable() const { return _init_state != unparsable_by_gc; } 863 // Value of _init_state must be zero (unparsable_by_gc) when klass field is set. 864 865 void follow_weak_klass_links( 866 BoolObjectClosure* is_alive, OopClosure* keep_alive); 867 void release_C_heap_structures(); 868 869 // Parallel Scavenge and Parallel Old 870 PARALLEL_GC_DECLS 871 872 // Naming 873 const char* signature_name() const; 874 875 // Iterators 876 int oop_oop_iterate(oop obj, OopClosure* blk) { 877 return oop_oop_iterate_v(obj, blk); 878 } 879 880 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) { 881 return oop_oop_iterate_v_m(obj, blk, mr); 882 } 883 884 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ 885 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ 886 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \ 887 MemRegion mr); 888 889 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL) 890 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL) 891 892 #ifndef SERIALGC 893 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ 894 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); 895 896 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 897 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) 898 #endif // !SERIALGC 899 900 private: 901 // initialization state 902 #ifdef ASSERT 903 void set_init_state(ClassState state); 904 #else 905 void set_init_state(ClassState state) { _init_state = (u1)state; } 906 #endif 907 void set_rewritten() { _misc_flags |= _misc_rewritten; } 908 void set_init_thread(Thread *thread) { _init_thread = thread; } 909 910 u2 idnum_allocated_count() const { return _idnum_allocated_count; } 911 // The RedefineClasses() API can cause new method idnums to be needed 912 // which will cause the caches to grow. Safety requires different 913 // cache management logic if the caches can grow instead of just 914 // going from NULL to non-NULL. 915 bool idnum_can_increment() const { return has_been_redefined(); } 916 jmethodID* methods_jmethod_ids_acquire() const 917 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); } 918 void release_set_methods_jmethod_ids(jmethodID* jmeths) 919 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); } 920 921 int* methods_cached_itable_indices_acquire() const 922 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); } 923 void release_set_methods_cached_itable_indices(int* indices) 924 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); } 925 926 inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos); 927 void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); } 928 void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p); 929 930 // Offsets for memory management 931 oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;} 932 oop* adr_methods() const { return (oop*)&this->_methods;} 933 oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;} 934 oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;} 935 oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;} 936 oop* adr_fields() const { return (oop*)&this->_fields;} 937 oop* adr_constants() const { return (oop*)&this->_constants;} 938 oop* adr_class_loader() const { return (oop*)&this->_class_loader;} 939 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;} 940 oop* adr_signers() const { return (oop*)&this->_signers;} 941 oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;} 942 oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;} 943 oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;} 944 oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;} 945 oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;} 946 oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;} 947 oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;} 948 oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;} 949 950 // Static methods that are used to implement member methods where an exposed this pointer 951 // is needed due to possible GCs 952 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); 953 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); 954 static void initialize_impl (instanceKlassHandle this_oop, TRAPS); 955 static void eager_initialize_impl (instanceKlassHandle this_oop); 956 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS); 957 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS); 958 static klassOop array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS); 959 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS); 960 /* jni_id_for_impl for jfieldID only */ 961 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset); 962 963 // Returns the array class for the n'th dimension 964 klassOop array_klass_impl(bool or_null, int n, TRAPS); 965 966 // Returns the array class with this class as element type 967 klassOop array_klass_impl(bool or_null, TRAPS); 968 969 public: 970 // sharing support 971 virtual void remove_unshareable_info(); 972 virtual void shared_symbols_iterate(SymbolClosure* closure); 973 974 // jvm support 975 jint compute_modifier_flags(TRAPS) const; 976 977 // JSR-292 support 978 MemberNameTable* member_names() { return _member_names; } 979 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; } 980 bool add_member_name(Handle member_name); 981 982 public: 983 // JVMTI support 984 jint jvmti_class_status() const; 985 986 public: 987 // Printing 988 void oop_print_value_on(oop obj, outputStream* st); 989 #ifndef PRODUCT 990 void oop_print_on (oop obj, outputStream* st); 991 992 void print_dependent_nmethods(bool verbose = false); 993 bool is_dependent_nmethod(nmethod* nm); 994 #endif 995 996 // Verification 997 const char* internal_name() const; 998 void oop_verify_on(oop obj, outputStream* st); 999 }; 1000 1001 inline methodOop instanceKlass::method_at_vtable(int index) { 1002 #ifndef PRODUCT 1003 assert(index >= 0, "valid vtable index"); 1004 if (DebugVtables) { 1005 verify_vtable_index(index); 1006 } 1007 #endif 1008 vtableEntry* ve = (vtableEntry*)start_of_vtable(); 1009 return ve[index].method(); 1010 } 1011 1012 inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) { 1013 if (annos == NULL || annos->length() <= idnum) { 1014 return NULL; 1015 } 1016 return typeArrayOop(annos->obj_at(idnum)); 1017 } 1018 1019 // for adding methods 1020 // UNSET_IDNUM return means no more ids available 1021 inline u2 instanceKlass::next_method_idnum() { 1022 if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) { 1023 return constMethodOopDesc::UNSET_IDNUM; // no more ids available 1024 } else { 1025 return _idnum_allocated_count++; 1026 } 1027 } 1028 1029 1030 /* JNIid class for jfieldIDs only */ 1031 class JNIid: public CHeapObj<mtClass> { 1032 friend class VMStructs; 1033 private: 1034 klassOop _holder; 1035 JNIid* _next; 1036 int _offset; 1037 #ifdef ASSERT 1038 bool _is_static_field_id; 1039 #endif 1040 1041 public: 1042 // Accessors 1043 klassOop holder() const { return _holder; } 1044 int offset() const { return _offset; } 1045 JNIid* next() { return _next; } 1046 // Constructor 1047 JNIid(klassOop holder, int offset, JNIid* next); 1048 // Identifier lookup 1049 JNIid* find(int offset); 1050 1051 bool find_local_field(fieldDescriptor* fd) { 1052 return instanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); 1053 } 1054 1055 // Garbage collection support 1056 oop* holder_addr() { return (oop*)&_holder; } 1057 void oops_do(OopClosure* f); 1058 static void deallocate(JNIid* id); 1059 // Debugging 1060 #ifdef ASSERT 1061 bool is_static_field_id() const { return _is_static_field_id; } 1062 void set_is_static_field_id() { _is_static_field_id = true; } 1063 #endif 1064 void verify(klassOop holder); 1065 }; 1066 1067 1068 // If breakpoints are more numerous than just JVMTI breakpoints, 1069 // consider compressing this data structure. 1070 // It is currently a simple linked list defined in methodOop.hpp. 1071 1072 class BreakpointInfo; 1073 1074 1075 // A collection point for interesting information about the previous 1076 // version(s) of an instanceKlass. This class uses weak references to 1077 // the information so that the information may be collected as needed 1078 // by the system. If the information is shared, then a regular 1079 // reference must be used because a weak reference would be seen as 1080 // collectible. A GrowableArray of PreviousVersionNodes is attached 1081 // to the instanceKlass as needed. See PreviousVersionWalker below. 1082 class PreviousVersionNode : public CHeapObj<mtClass> { 1083 private: 1084 // A shared ConstantPool is never collected so we'll always have 1085 // a reference to it so we can update items in the cache. We'll 1086 // have a weak reference to a non-shared ConstantPool until all 1087 // of the methods (EMCP or obsolete) have been collected; the 1088 // non-shared ConstantPool becomes collectible at that point. 1089 jobject _prev_constant_pool; // regular or weak reference 1090 bool _prev_cp_is_weak; // true if not a shared ConstantPool 1091 1092 // If the previous version of the instanceKlass doesn't have any 1093 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the 1094 // EMCP methods have been collected, then _prev_EMCP_methods can 1095 // have a length of zero. 1096 GrowableArray<jweak>* _prev_EMCP_methods; 1097 1098 public: 1099 PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak, 1100 GrowableArray<jweak>* prev_EMCP_methods); 1101 ~PreviousVersionNode(); 1102 jobject prev_constant_pool() const { 1103 return _prev_constant_pool; 1104 } 1105 GrowableArray<jweak>* prev_EMCP_methods() const { 1106 return _prev_EMCP_methods; 1107 } 1108 }; 1109 1110 1111 // A Handle-ized version of PreviousVersionNode. 1112 class PreviousVersionInfo : public ResourceObj { 1113 private: 1114 constantPoolHandle _prev_constant_pool_handle; 1115 // If the previous version of the instanceKlass doesn't have any 1116 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the 1117 // methods cannot be collected while we hold a handle, 1118 // _prev_EMCP_methods should never have a length of zero. 1119 GrowableArray<methodHandle>* _prev_EMCP_method_handles; 1120 1121 public: 1122 PreviousVersionInfo(PreviousVersionNode *pv_node); 1123 ~PreviousVersionInfo(); 1124 constantPoolHandle prev_constant_pool_handle() const { 1125 return _prev_constant_pool_handle; 1126 } 1127 GrowableArray<methodHandle>* prev_EMCP_method_handles() const { 1128 return _prev_EMCP_method_handles; 1129 } 1130 }; 1131 1132 1133 // Helper object for walking previous versions. This helper cleans up 1134 // the Handles that it allocates when the helper object is destroyed. 1135 // The PreviousVersionInfo object returned by next_previous_version() 1136 // is only valid until a subsequent call to next_previous_version() or 1137 // the helper object is destroyed. 1138 class PreviousVersionWalker : public StackObj { 1139 private: 1140 GrowableArray<PreviousVersionNode *>* _previous_versions; 1141 int _current_index; 1142 // Fields for cleaning up when we are done walking the previous versions: 1143 // A HandleMark for the PreviousVersionInfo handles: 1144 HandleMark _hm; 1145 1146 // It would be nice to have a ResourceMark field in this helper also, 1147 // but the ResourceMark code says to be careful to delete handles held 1148 // in GrowableArrays _before_ deleting the GrowableArray. Since we 1149 // can't guarantee the order in which the fields are destroyed, we 1150 // have to let the creator of the PreviousVersionWalker object do 1151 // the right thing. Also, adding a ResourceMark here causes an 1152 // include loop. 1153 1154 // A pointer to the current info object so we can handle the deletes. 1155 PreviousVersionInfo * _current_p; 1156 1157 public: 1158 PreviousVersionWalker(instanceKlass *ik); 1159 ~PreviousVersionWalker(); 1160 1161 // Return the interesting information for the next previous version 1162 // of the klass. Returns NULL if there are no more previous versions. 1163 PreviousVersionInfo* next_previous_version(); 1164 }; 1165 1166 1167 // 1168 // nmethodBucket is used to record dependent nmethods for 1169 // deoptimization. nmethod dependencies are actually <klass, method> 1170 // pairs but we really only care about the klass part for purposes of 1171 // finding nmethods which might need to be deoptimized. Instead of 1172 // recording the method, a count of how many times a particular nmethod 1173 // was recorded is kept. This ensures that any recording errors are 1174 // noticed since an nmethod should be removed as many times are it's 1175 // added. 1176 // 1177 class nmethodBucket: public CHeapObj<mtClass> { 1178 friend class VMStructs; 1179 private: 1180 nmethod* _nmethod; 1181 int _count; 1182 nmethodBucket* _next; 1183 1184 public: 1185 nmethodBucket(nmethod* nmethod, nmethodBucket* next) { 1186 _nmethod = nmethod; 1187 _next = next; 1188 _count = 1; 1189 } 1190 int count() { return _count; } 1191 int increment() { _count += 1; return _count; } 1192 int decrement() { _count -= 1; assert(_count >= 0, "don't underflow"); return _count; } 1193 nmethodBucket* next() { return _next; } 1194 void set_next(nmethodBucket* b) { _next = b; } 1195 nmethod* get_nmethod() { return _nmethod; } 1196 }; 1197 1198 // An iterator that's used to access the inner classes indices in the 1199 // instanceKlass::_inner_classes array. 1200 class InnerClassesIterator : public StackObj { 1201 private: 1202 typeArrayHandle _inner_classes; 1203 int _length; 1204 int _idx; 1205 public: 1206 1207 InnerClassesIterator(instanceKlassHandle k) { 1208 _inner_classes = k->inner_classes(); 1209 if (k->inner_classes() != NULL) { 1210 _length = _inner_classes->length(); 1211 // The inner class array's length should be the multiple of 1212 // inner_class_next_offset if it only contains the InnerClasses 1213 // attribute data, or it should be 1214 // n*inner_class_next_offset+enclosing_method_attribute_size 1215 // if it also contains the EnclosingMethod data. 1216 assert((_length % instanceKlass::inner_class_next_offset == 0 || 1217 _length % instanceKlass::inner_class_next_offset == instanceKlass::enclosing_method_attribute_size), 1218 "just checking"); 1219 // Remove the enclosing_method portion if exists. 1220 if (_length % instanceKlass::inner_class_next_offset == instanceKlass::enclosing_method_attribute_size) { 1221 _length -= instanceKlass::enclosing_method_attribute_size; 1222 } 1223 } else { 1224 _length = 0; 1225 } 1226 _idx = 0; 1227 } 1228 1229 int length() const { 1230 return _length; 1231 } 1232 1233 void next() { 1234 _idx += instanceKlass::inner_class_next_offset; 1235 } 1236 1237 bool done() const { 1238 return (_idx >= _length); 1239 } 1240 1241 u2 inner_class_info_index() const { 1242 return _inner_classes->ushort_at( 1243 _idx + instanceKlass::inner_class_inner_class_info_offset); 1244 } 1245 1246 void set_inner_class_info_index(u2 index) { 1247 _inner_classes->ushort_at_put( 1248 _idx + instanceKlass::inner_class_inner_class_info_offset, index); 1249 } 1250 1251 u2 outer_class_info_index() const { 1252 return _inner_classes->ushort_at( 1253 _idx + instanceKlass::inner_class_outer_class_info_offset); 1254 } 1255 1256 void set_outer_class_info_index(u2 index) { 1257 _inner_classes->ushort_at_put( 1258 _idx + instanceKlass::inner_class_outer_class_info_offset, index); 1259 } 1260 1261 u2 inner_name_index() const { 1262 return _inner_classes->ushort_at( 1263 _idx + instanceKlass::inner_class_inner_name_offset); 1264 } 1265 1266 void set_inner_name_index(u2 index) { 1267 _inner_classes->ushort_at_put( 1268 _idx + instanceKlass::inner_class_inner_name_offset, index); 1269 } 1270 1271 u2 inner_access_flags() const { 1272 return _inner_classes->ushort_at( 1273 _idx + instanceKlass::inner_class_access_flags_offset); 1274 } 1275 }; 1276 1277 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP