1 /* 2 * Copyright (c) 1997, 2022, 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 #include "precompiled.hpp" 26 #include "cds/archiveUtils.hpp" 27 #include "cds/classListWriter.hpp" 28 #include "cds/heapShared.hpp" 29 #include "cds/metaspaceShared.hpp" 30 #include "classfile/classFileParser.hpp" 31 #include "classfile/classFileStream.hpp" 32 #include "classfile/classLoader.hpp" 33 #include "classfile/classLoaderData.inline.hpp" 34 #include "classfile/javaClasses.hpp" 35 #include "classfile/moduleEntry.hpp" 36 #include "classfile/systemDictionary.hpp" 37 #include "classfile/systemDictionaryShared.hpp" 38 #include "classfile/verifier.hpp" 39 #include "classfile/vmClasses.hpp" 40 #include "classfile/vmSymbols.hpp" 41 #include "code/codeCache.hpp" 42 #include "code/dependencyContext.hpp" 43 #include "compiler/compilationPolicy.hpp" 44 #include "compiler/compileBroker.hpp" 45 #include "gc/shared/collectedHeap.inline.hpp" 46 #include "interpreter/oopMapCache.hpp" 47 #include "interpreter/rewriter.hpp" 48 #include "jvm.h" 49 #include "jvmtifiles/jvmti.h" 50 #include "logging/log.hpp" 51 #include "logging/logMessage.hpp" 52 #include "logging/logStream.hpp" 53 #include "memory/allocation.inline.hpp" 54 #include "memory/iterator.inline.hpp" 55 #include "memory/metadataFactory.hpp" 56 #include "memory/metaspaceClosure.hpp" 57 #include "memory/oopFactory.hpp" 58 #include "memory/resourceArea.hpp" 59 #include "memory/universe.hpp" 60 #include "oops/fieldStreams.inline.hpp" 61 #include "oops/constantPool.hpp" 62 #include "oops/instanceClassLoaderKlass.hpp" 63 #include "oops/instanceKlass.inline.hpp" 64 #include "oops/instanceMirrorKlass.hpp" 65 #include "oops/instanceOop.hpp" 66 #include "oops/instanceStackChunkKlass.hpp" 67 #include "oops/klass.inline.hpp" 68 #include "oops/method.hpp" 69 #include "oops/oop.inline.hpp" 70 #include "oops/recordComponent.hpp" 71 #include "oops/symbol.hpp" 72 #include "oops/inlineKlass.hpp" 73 #include "prims/jvmtiExport.hpp" 74 #include "prims/jvmtiRedefineClasses.hpp" 75 #include "prims/jvmtiThreadState.hpp" 76 #include "prims/methodComparator.hpp" 77 #include "runtime/arguments.hpp" 78 #include "runtime/atomic.hpp" 79 #include "runtime/fieldDescriptor.inline.hpp" 80 #include "runtime/handles.inline.hpp" 81 #include "runtime/javaCalls.hpp" 82 #include "runtime/javaThread.inline.hpp" 83 #include "runtime/mutexLocker.hpp" 84 #include "runtime/orderAccess.hpp" 85 #include "runtime/reflectionUtils.hpp" 86 #include "runtime/threads.hpp" 87 #include "services/classLoadingService.hpp" 88 #include "services/finalizerService.hpp" 89 #include "services/threadService.hpp" 90 #include "utilities/dtrace.hpp" 91 #include "utilities/events.hpp" 92 #include "utilities/macros.hpp" 93 #include "utilities/stringUtils.hpp" 94 #include "utilities/pair.hpp" 95 #ifdef COMPILER1 96 #include "c1/c1_Compiler.hpp" 97 #endif 98 #if INCLUDE_JFR 99 #include "jfr/jfrEvents.hpp" 100 #endif 101 102 #ifdef DTRACE_ENABLED 103 104 105 #define HOTSPOT_CLASS_INITIALIZATION_required HOTSPOT_CLASS_INITIALIZATION_REQUIRED 106 #define HOTSPOT_CLASS_INITIALIZATION_recursive HOTSPOT_CLASS_INITIALIZATION_RECURSIVE 107 #define HOTSPOT_CLASS_INITIALIZATION_concurrent HOTSPOT_CLASS_INITIALIZATION_CONCURRENT 108 #define HOTSPOT_CLASS_INITIALIZATION_erroneous HOTSPOT_CLASS_INITIALIZATION_ERRONEOUS 109 #define HOTSPOT_CLASS_INITIALIZATION_super__failed HOTSPOT_CLASS_INITIALIZATION_SUPER_FAILED 110 #define HOTSPOT_CLASS_INITIALIZATION_clinit HOTSPOT_CLASS_INITIALIZATION_CLINIT 111 #define HOTSPOT_CLASS_INITIALIZATION_error HOTSPOT_CLASS_INITIALIZATION_ERROR 112 #define HOTSPOT_CLASS_INITIALIZATION_end HOTSPOT_CLASS_INITIALIZATION_END 113 #define DTRACE_CLASSINIT_PROBE(type, thread_type) \ 114 { \ 115 char* data = NULL; \ 116 int len = 0; \ 117 Symbol* clss_name = name(); \ 118 if (clss_name != NULL) { \ 119 data = (char*)clss_name->bytes(); \ 120 len = clss_name->utf8_length(); \ 121 } \ 122 HOTSPOT_CLASS_INITIALIZATION_##type( \ 123 data, len, (void*)class_loader(), thread_type); \ 124 } 125 126 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait) \ 127 { \ 128 char* data = NULL; \ 129 int len = 0; \ 130 Symbol* clss_name = name(); \ 131 if (clss_name != NULL) { \ 132 data = (char*)clss_name->bytes(); \ 133 len = clss_name->utf8_length(); \ 134 } \ 135 HOTSPOT_CLASS_INITIALIZATION_##type( \ 136 data, len, (void*)class_loader(), thread_type, wait); \ 137 } 138 139 #else // ndef DTRACE_ENABLED 140 141 #define DTRACE_CLASSINIT_PROBE(type, thread_type) 142 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait) 143 144 #endif // ndef DTRACE_ENABLED 145 146 bool InstanceKlass::_finalization_enabled = true; 147 148 static inline bool is_class_loader(const Symbol* class_name, 149 const ClassFileParser& parser) { 150 assert(class_name != NULL, "invariant"); 151 152 if (class_name == vmSymbols::java_lang_ClassLoader()) { 153 return true; 154 } 155 156 if (vmClasses::ClassLoader_klass_loaded()) { 157 const Klass* const super_klass = parser.super_klass(); 158 if (super_klass != NULL) { 159 if (super_klass->is_subtype_of(vmClasses::ClassLoader_klass())) { 160 return true; 161 } 162 } 163 } 164 return false; 165 } 166 167 bool InstanceKlass::field_is_null_free_inline_type(int index) const { return Signature::basic_type(field(index)->signature(constants())) == T_PRIMITIVE_OBJECT; } 168 169 static inline bool is_stack_chunk_class(const Symbol* class_name, 170 const ClassLoaderData* loader_data) { 171 return (class_name == vmSymbols::jdk_internal_vm_StackChunk() && 172 loader_data->is_the_null_class_loader_data()); 173 } 174 175 // private: called to verify that k is a static member of this nest. 176 // We know that k is an instance class in the same package and hence the 177 // same classloader. 178 bool InstanceKlass::has_nest_member(JavaThread* current, InstanceKlass* k) const { 179 assert(!is_hidden(), "unexpected hidden class"); 180 if (_nest_members == NULL || _nest_members == Universe::the_empty_short_array()) { 181 if (log_is_enabled(Trace, class, nestmates)) { 182 ResourceMark rm(current); 183 log_trace(class, nestmates)("Checked nest membership of %s in non-nest-host class %s", 184 k->external_name(), this->external_name()); 185 } 186 return false; 187 } 188 189 if (log_is_enabled(Trace, class, nestmates)) { 190 ResourceMark rm(current); 191 log_trace(class, nestmates)("Checking nest membership of %s in %s", 192 k->external_name(), this->external_name()); 193 } 194 195 // Check for the named class in _nest_members. 196 // We don't resolve, or load, any classes. 197 for (int i = 0; i < _nest_members->length(); i++) { 198 int cp_index = _nest_members->at(i); 199 Symbol* name = _constants->klass_name_at(cp_index); 200 if (name == k->name()) { 201 log_trace(class, nestmates)("- named class found at nest_members[%d] => cp[%d]", i, cp_index); 202 return true; 203 } 204 } 205 log_trace(class, nestmates)("- class is NOT a nest member!"); 206 return false; 207 } 208 209 // Called to verify that k is a permitted subclass of this class 210 bool InstanceKlass::has_as_permitted_subclass(const InstanceKlass* k) const { 211 Thread* current = Thread::current(); 212 assert(k != NULL, "sanity check"); 213 assert(_permitted_subclasses != NULL && _permitted_subclasses != Universe::the_empty_short_array(), 214 "unexpected empty _permitted_subclasses array"); 215 216 if (log_is_enabled(Trace, class, sealed)) { 217 ResourceMark rm(current); 218 log_trace(class, sealed)("Checking for permitted subclass of %s in %s", 219 k->external_name(), this->external_name()); 220 } 221 222 // Check that the class and its super are in the same module. 223 if (k->module() != this->module()) { 224 ResourceMark rm(current); 225 log_trace(class, sealed)("Check failed for same module of permitted subclass %s and sealed class %s", 226 k->external_name(), this->external_name()); 227 return false; 228 } 229 230 if (!k->is_public() && !is_same_class_package(k)) { 231 ResourceMark rm(current); 232 log_trace(class, sealed)("Check failed, subclass %s not public and not in the same package as sealed class %s", 233 k->external_name(), this->external_name()); 234 return false; 235 } 236 237 for (int i = 0; i < _permitted_subclasses->length(); i++) { 238 int cp_index = _permitted_subclasses->at(i); 239 Symbol* name = _constants->klass_name_at(cp_index); 240 if (name == k->name()) { 241 log_trace(class, sealed)("- Found it at permitted_subclasses[%d] => cp[%d]", i, cp_index); 242 return true; 243 } 244 } 245 log_trace(class, sealed)("- class is NOT a permitted subclass!"); 246 return false; 247 } 248 249 // Return nest-host class, resolving, validating and saving it if needed. 250 // In cases where this is called from a thread that cannot do classloading 251 // (such as a native JIT thread) then we simply return NULL, which in turn 252 // causes the access check to return false. Such code will retry the access 253 // from a more suitable environment later. Otherwise the _nest_host is always 254 // set once this method returns. 255 // Any errors from nest-host resolution must be preserved so they can be queried 256 // from higher-level access checking code, and reported as part of access checking 257 // exceptions. 258 // VirtualMachineErrors are propagated with a NULL return. 259 // Under any conditions where the _nest_host can be set to non-NULL the resulting 260 // value of it and, if applicable, the nest host resolution/validation error, 261 // are idempotent. 262 InstanceKlass* InstanceKlass::nest_host(TRAPS) { 263 InstanceKlass* nest_host_k = _nest_host; 264 if (nest_host_k != NULL) { 265 return nest_host_k; 266 } 267 268 ResourceMark rm(THREAD); 269 270 // need to resolve and save our nest-host class. 271 if (_nest_host_index != 0) { // we have a real nest_host 272 // Before trying to resolve check if we're in a suitable context 273 bool can_resolve = THREAD->can_call_java(); 274 if (!can_resolve && !_constants->tag_at(_nest_host_index).is_klass()) { 275 log_trace(class, nestmates)("Rejected resolution of nest-host of %s in unsuitable thread", 276 this->external_name()); 277 return NULL; // sentinel to say "try again from a different context" 278 } 279 280 log_trace(class, nestmates)("Resolving nest-host of %s using cp entry for %s", 281 this->external_name(), 282 _constants->klass_name_at(_nest_host_index)->as_C_string()); 283 284 Klass* k = _constants->klass_at(_nest_host_index, THREAD); 285 if (HAS_PENDING_EXCEPTION) { 286 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) { 287 return NULL; // propagate VMEs 288 } 289 stringStream ss; 290 char* target_host_class = _constants->klass_name_at(_nest_host_index)->as_C_string(); 291 ss.print("Nest host resolution of %s with host %s failed: ", 292 this->external_name(), target_host_class); 293 java_lang_Throwable::print(PENDING_EXCEPTION, &ss); 294 const char* msg = ss.as_string(true /* on C-heap */); 295 constantPoolHandle cph(THREAD, constants()); 296 SystemDictionary::add_nest_host_error(cph, _nest_host_index, msg); 297 CLEAR_PENDING_EXCEPTION; 298 299 log_trace(class, nestmates)("%s", msg); 300 } else { 301 // A valid nest-host is an instance class in the current package that lists this 302 // class as a nest member. If any of these conditions are not met the class is 303 // its own nest-host. 304 const char* error = NULL; 305 306 // JVMS 5.4.4 indicates package check comes first 307 if (is_same_class_package(k)) { 308 // Now check actual membership. We can't be a member if our "host" is 309 // not an instance class. 310 if (k->is_instance_klass()) { 311 nest_host_k = InstanceKlass::cast(k); 312 bool is_member = nest_host_k->has_nest_member(THREAD, this); 313 if (is_member) { 314 _nest_host = nest_host_k; // save resolved nest-host value 315 316 log_trace(class, nestmates)("Resolved nest-host of %s to %s", 317 this->external_name(), k->external_name()); 318 return nest_host_k; 319 } else { 320 error = "current type is not listed as a nest member"; 321 } 322 } else { 323 error = "host is not an instance class"; 324 } 325 } else { 326 error = "types are in different packages"; 327 } 328 329 // something went wrong, so record what and log it 330 { 331 stringStream ss; 332 ss.print("Type %s (loader: %s) is not a nest member of type %s (loader: %s): %s", 333 this->external_name(), 334 this->class_loader_data()->loader_name_and_id(), 335 k->external_name(), 336 k->class_loader_data()->loader_name_and_id(), 337 error); 338 const char* msg = ss.as_string(true /* on C-heap */); 339 constantPoolHandle cph(THREAD, constants()); 340 SystemDictionary::add_nest_host_error(cph, _nest_host_index, msg); 341 log_trace(class, nestmates)("%s", msg); 342 } 343 } 344 } else { 345 log_trace(class, nestmates)("Type %s is not part of a nest: setting nest-host to self", 346 this->external_name()); 347 } 348 349 // Either not in an explicit nest, or else an error occurred, so 350 // the nest-host is set to `this`. Any thread that sees this assignment 351 // will also see any setting of nest_host_error(), if applicable. 352 return (_nest_host = this); 353 } 354 355 // Dynamic nest member support: set this class's nest host to the given class. 356 // This occurs as part of the class definition, as soon as the instanceKlass 357 // has been created and doesn't require further resolution. The code: 358 // lookup().defineHiddenClass(bytes_for_X, NESTMATE); 359 // results in: 360 // class_of_X.set_nest_host(lookup().lookupClass().getNestHost()) 361 // If it has an explicit _nest_host_index or _nest_members, these will be ignored. 362 // We also know the "host" is a valid nest-host in the same package so we can 363 // assert some of those facts. 364 void InstanceKlass::set_nest_host(InstanceKlass* host) { 365 assert(is_hidden(), "must be a hidden class"); 366 assert(host != NULL, "NULL nest host specified"); 367 assert(_nest_host == NULL, "current class has resolved nest-host"); 368 assert(nest_host_error() == NULL, "unexpected nest host resolution error exists: %s", 369 nest_host_error()); 370 assert((host->_nest_host == NULL && host->_nest_host_index == 0) || 371 (host->_nest_host == host), "proposed host is not a valid nest-host"); 372 // Can't assert this as package is not set yet: 373 // assert(is_same_class_package(host), "proposed host is in wrong package"); 374 375 if (log_is_enabled(Trace, class, nestmates)) { 376 ResourceMark rm; 377 const char* msg = ""; 378 // a hidden class does not expect a statically defined nest-host 379 if (_nest_host_index > 0) { 380 msg = "(the NestHost attribute in the current class is ignored)"; 381 } else if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) { 382 msg = "(the NestMembers attribute in the current class is ignored)"; 383 } 384 log_trace(class, nestmates)("Injected type %s into the nest of %s %s", 385 this->external_name(), 386 host->external_name(), 387 msg); 388 } 389 // set dynamic nest host 390 _nest_host = host; 391 // Record dependency to keep nest host from being unloaded before this class. 392 ClassLoaderData* this_key = class_loader_data(); 393 assert(this_key != NULL, "sanity"); 394 this_key->record_dependency(host); 395 } 396 397 // check if 'this' and k are nestmates (same nest_host), or k is our nest_host, 398 // or we are k's nest_host - all of which is covered by comparing the two 399 // resolved_nest_hosts. 400 // Any exceptions (i.e. VMEs) are propagated. 401 bool InstanceKlass::has_nestmate_access_to(InstanceKlass* k, TRAPS) { 402 403 assert(this != k, "this should be handled by higher-level code"); 404 405 // Per JVMS 5.4.4 we first resolve and validate the current class, then 406 // the target class k. 407 408 InstanceKlass* cur_host = nest_host(CHECK_false); 409 if (cur_host == NULL) { 410 return false; 411 } 412 413 Klass* k_nest_host = k->nest_host(CHECK_false); 414 if (k_nest_host == NULL) { 415 return false; 416 } 417 418 bool access = (cur_host == k_nest_host); 419 420 ResourceMark rm(THREAD); 421 log_trace(class, nestmates)("Class %s does %shave nestmate access to %s", 422 this->external_name(), 423 access ? "" : "NOT ", 424 k->external_name()); 425 return access; 426 } 427 428 const char* InstanceKlass::nest_host_error() { 429 if (_nest_host_index == 0) { 430 return NULL; 431 } else { 432 constantPoolHandle cph(Thread::current(), constants()); 433 return SystemDictionary::find_nest_host_error(cph, (int)_nest_host_index); 434 } 435 } 436 437 InstanceKlass* InstanceKlass::allocate_instance_klass(const ClassFileParser& parser, TRAPS) { 438 const int size = InstanceKlass::size(parser.vtable_size(), 439 parser.itable_size(), 440 nonstatic_oop_map_size(parser.total_oop_map_count()), 441 parser.is_interface(), 442 parser.has_inline_fields() ? parser.java_fields_count() : 0, 443 parser.is_inline_type()); 444 445 const Symbol* const class_name = parser.class_name(); 446 assert(class_name != NULL, "invariant"); 447 ClassLoaderData* loader_data = parser.loader_data(); 448 assert(loader_data != NULL, "invariant"); 449 450 InstanceKlass* ik; 451 452 // Allocation 453 if (parser.is_instance_ref_klass()) { 454 // java.lang.ref.Reference 455 ik = new (loader_data, size, THREAD) InstanceRefKlass(parser); 456 } else if (class_name == vmSymbols::java_lang_Class()) { 457 // mirror - java.lang.Class 458 ik = new (loader_data, size, THREAD) InstanceMirrorKlass(parser); 459 } else if (is_stack_chunk_class(class_name, loader_data)) { 460 // stack chunk 461 ik = new (loader_data, size, THREAD) InstanceStackChunkKlass(parser); 462 } else if (is_class_loader(class_name, parser)) { 463 // class loader - java.lang.ClassLoader 464 ik = new (loader_data, size, THREAD) InstanceClassLoaderKlass(parser); 465 } else if (parser.is_inline_type()) { 466 // inline type 467 ik = new (loader_data, size, THREAD) InlineKlass(parser); 468 } else { 469 // normal 470 ik = new (loader_data, size, THREAD) InstanceKlass(parser); 471 } 472 473 // Check for pending exception before adding to the loader data and incrementing 474 // class count. Can get OOM here. 475 if (HAS_PENDING_EXCEPTION) { 476 return NULL; 477 } 478 479 #ifdef ASSERT 480 assert(ik->size() == size, ""); 481 ik->bounds_check((address) ik->start_of_vtable(), false, size); 482 ik->bounds_check((address) ik->start_of_itable(), false, size); 483 ik->bounds_check((address) ik->end_of_itable(), true, size); 484 ik->bounds_check((address) ik->end_of_nonstatic_oop_maps(), true, size); 485 #endif //ASSERT 486 return ik; 487 } 488 489 #ifndef PRODUCT 490 bool InstanceKlass::bounds_check(address addr, bool edge_ok, intptr_t size_in_bytes) const { 491 const char* bad = NULL; 492 address end = NULL; 493 if (addr < (address)this) { 494 bad = "before"; 495 } else if (addr == (address)this) { 496 if (edge_ok) return true; 497 bad = "just before"; 498 } else if (addr == (end = (address)this + sizeof(intptr_t) * (size_in_bytes < 0 ? size() : size_in_bytes))) { 499 if (edge_ok) return true; 500 bad = "just after"; 501 } else if (addr > end) { 502 bad = "after"; 503 } else { 504 return true; 505 } 506 tty->print_cr("%s object bounds: " INTPTR_FORMAT " [" INTPTR_FORMAT ".." INTPTR_FORMAT "]", 507 bad, (intptr_t)addr, (intptr_t)this, (intptr_t)end); 508 Verbose = WizardMode = true; this->print(); //@@ 509 return false; 510 } 511 #endif //PRODUCT 512 513 // copy method ordering from resource area to Metaspace 514 void InstanceKlass::copy_method_ordering(const intArray* m, TRAPS) { 515 if (m != NULL) { 516 // allocate a new array and copy contents (memcpy?) 517 _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK); 518 for (int i = 0; i < m->length(); i++) { 519 _method_ordering->at_put(i, m->at(i)); 520 } 521 } else { 522 _method_ordering = Universe::the_empty_int_array(); 523 } 524 } 525 526 // create a new array of vtable_indices for default methods 527 Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) { 528 Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL); 529 assert(default_vtable_indices() == NULL, "only create once"); 530 set_default_vtable_indices(vtable_indices); 531 return vtable_indices; 532 } 533 534 static Monitor* create_init_monitor(const char* name) { 535 return new Monitor(Mutex::safepoint, name); 536 } 537 538 InstanceKlass::InstanceKlass(const ClassFileParser& parser, KlassKind kind, ReferenceType reference_type) : 539 Klass(kind), 540 _nest_members(NULL), 541 _nest_host(NULL), 542 _permitted_subclasses(NULL), 543 _record_components(NULL), 544 _static_field_size(parser.static_field_size()), 545 _nonstatic_oop_map_size(nonstatic_oop_map_size(parser.total_oop_map_count())), 546 _itable_len(parser.itable_size()), 547 _nest_host_index(0), 548 _init_state(allocated), 549 _reference_type(reference_type), 550 _init_monitor(create_init_monitor("InstanceKlassInitMonitor_lock")), 551 _init_thread(NULL), 552 _inline_type_field_klasses(NULL), 553 _preload_classes(NULL), 554 _adr_inlineklass_fixed_block(NULL) 555 { 556 set_vtable_length(parser.vtable_size()); 557 set_access_flags(parser.access_flags()); 558 if (parser.is_hidden()) set_is_hidden(); 559 set_layout_helper(Klass::instance_layout_helper(parser.layout_size(), 560 false)); 561 if (parser.has_inline_fields()) { 562 set_has_inline_type_fields(); 563 } 564 _java_fields_count = parser.java_fields_count(); 565 566 assert(NULL == _methods, "underlying memory not zeroed?"); 567 assert(is_instance_klass(), "is layout incorrect?"); 568 assert(size_helper() == parser.layout_size(), "incorrect size_helper?"); 569 570 if (has_inline_type_fields()) { 571 _inline_type_field_klasses = (const Klass**) adr_inline_type_field_klasses(); 572 } 573 } 574 575 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data, 576 Array<Method*>* methods) { 577 if (methods != NULL && methods != Universe::the_empty_method_array() && 578 !methods->is_shared()) { 579 for (int i = 0; i < methods->length(); i++) { 580 Method* method = methods->at(i); 581 if (method == NULL) continue; // maybe null if error processing 582 // Only want to delete methods that are not executing for RedefineClasses. 583 // The previous version will point to them so they're not totally dangling 584 assert (!method->on_stack(), "shouldn't be called with methods on stack"); 585 MetadataFactory::free_metadata(loader_data, method); 586 } 587 MetadataFactory::free_array<Method*>(loader_data, methods); 588 } 589 } 590 591 void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data, 592 const Klass* super_klass, 593 Array<InstanceKlass*>* local_interfaces, 594 Array<InstanceKlass*>* transitive_interfaces) { 595 // Only deallocate transitive interfaces if not empty, same as super class 596 // or same as local interfaces. See code in parseClassFile. 597 Array<InstanceKlass*>* ti = transitive_interfaces; 598 if (ti != Universe::the_empty_instance_klass_array() && ti != local_interfaces) { 599 // check that the interfaces don't come from super class 600 Array<InstanceKlass*>* sti = (super_klass == NULL) ? NULL : 601 InstanceKlass::cast(super_klass)->transitive_interfaces(); 602 if (ti != sti && ti != NULL && !ti->is_shared()) { 603 MetadataFactory::free_array<InstanceKlass*>(loader_data, ti); 604 } 605 } 606 607 // local interfaces can be empty 608 if (local_interfaces != Universe::the_empty_instance_klass_array() && 609 local_interfaces != NULL && !local_interfaces->is_shared()) { 610 MetadataFactory::free_array<InstanceKlass*>(loader_data, local_interfaces); 611 } 612 } 613 614 void InstanceKlass::deallocate_record_components(ClassLoaderData* loader_data, 615 Array<RecordComponent*>* record_components) { 616 if (record_components != NULL && !record_components->is_shared()) { 617 for (int i = 0; i < record_components->length(); i++) { 618 RecordComponent* record_component = record_components->at(i); 619 MetadataFactory::free_metadata(loader_data, record_component); 620 } 621 MetadataFactory::free_array<RecordComponent*>(loader_data, record_components); 622 } 623 } 624 625 // This function deallocates the metadata and C heap pointers that the 626 // InstanceKlass points to. 627 void InstanceKlass::deallocate_contents(ClassLoaderData* loader_data) { 628 // Orphan the mirror first, CMS thinks it's still live. 629 if (java_mirror() != NULL) { 630 java_lang_Class::set_klass(java_mirror(), NULL); 631 } 632 633 // Also remove mirror from handles 634 loader_data->remove_handle(_java_mirror); 635 636 // Need to take this class off the class loader data list. 637 loader_data->remove_class(this); 638 639 // The array_klass for this class is created later, after error handling. 640 // For class redefinition, we keep the original class so this scratch class 641 // doesn't have an array class. Either way, assert that there is nothing 642 // to deallocate. 643 assert(array_klasses() == NULL, "array classes shouldn't be created for this class yet"); 644 645 // Release C heap allocated data that this points to, which includes 646 // reference counting symbol names. 647 // Can't release the constant pool or MethodData C heap data here because the constant 648 // pool can be deallocated separately from the InstanceKlass for default methods and 649 // redefine classes. MethodData can also be released separately. 650 release_C_heap_structures(/* release_sub_metadata */ false); 651 652 deallocate_methods(loader_data, methods()); 653 set_methods(NULL); 654 655 deallocate_record_components(loader_data, record_components()); 656 set_record_components(NULL); 657 658 if (method_ordering() != NULL && 659 method_ordering() != Universe::the_empty_int_array() && 660 !method_ordering()->is_shared()) { 661 MetadataFactory::free_array<int>(loader_data, method_ordering()); 662 } 663 set_method_ordering(NULL); 664 665 // default methods can be empty 666 if (default_methods() != NULL && 667 default_methods() != Universe::the_empty_method_array() && 668 !default_methods()->is_shared()) { 669 MetadataFactory::free_array<Method*>(loader_data, default_methods()); 670 } 671 // Do NOT deallocate the default methods, they are owned by superinterfaces. 672 set_default_methods(NULL); 673 674 // default methods vtable indices can be empty 675 if (default_vtable_indices() != NULL && 676 !default_vtable_indices()->is_shared()) { 677 MetadataFactory::free_array<int>(loader_data, default_vtable_indices()); 678 } 679 set_default_vtable_indices(NULL); 680 681 682 // This array is in Klass, but remove it with the InstanceKlass since 683 // this place would be the only caller and it can share memory with transitive 684 // interfaces. 685 if (secondary_supers() != NULL && 686 secondary_supers() != Universe::the_empty_klass_array() && 687 // see comments in compute_secondary_supers about the following cast 688 (address)(secondary_supers()) != (address)(transitive_interfaces()) && 689 !secondary_supers()->is_shared()) { 690 MetadataFactory::free_array<Klass*>(loader_data, secondary_supers()); 691 } 692 set_secondary_supers(NULL); 693 694 deallocate_interfaces(loader_data, super(), local_interfaces(), transitive_interfaces()); 695 set_transitive_interfaces(NULL); 696 set_local_interfaces(NULL); 697 698 if (fields() != NULL && !fields()->is_shared()) { 699 MetadataFactory::free_array<jushort>(loader_data, fields()); 700 } 701 set_fields(NULL, 0); 702 703 // If a method from a redefined class is using this constant pool, don't 704 // delete it, yet. The new class's previous version will point to this. 705 if (constants() != NULL) { 706 assert (!constants()->on_stack(), "shouldn't be called if anything is onstack"); 707 if (!constants()->is_shared()) { 708 MetadataFactory::free_metadata(loader_data, constants()); 709 } 710 // Delete any cached resolution errors for the constant pool 711 SystemDictionary::delete_resolution_error(constants()); 712 713 set_constants(NULL); 714 } 715 716 if (inner_classes() != NULL && 717 inner_classes() != Universe::the_empty_short_array() && 718 !inner_classes()->is_shared()) { 719 MetadataFactory::free_array<jushort>(loader_data, inner_classes()); 720 } 721 set_inner_classes(NULL); 722 723 if (nest_members() != NULL && 724 nest_members() != Universe::the_empty_short_array() && 725 !nest_members()->is_shared()) { 726 MetadataFactory::free_array<jushort>(loader_data, nest_members()); 727 } 728 set_nest_members(NULL); 729 730 if (permitted_subclasses() != NULL && 731 permitted_subclasses() != Universe::the_empty_short_array() && 732 !permitted_subclasses()->is_shared()) { 733 MetadataFactory::free_array<jushort>(loader_data, permitted_subclasses()); 734 } 735 set_permitted_subclasses(NULL); 736 737 if (preload_classes() != NULL && 738 preload_classes() != Universe::the_empty_short_array() && 739 !preload_classes()->is_shared()) { 740 MetadataFactory::free_array<jushort>(loader_data, preload_classes()); 741 } 742 743 // We should deallocate the Annotations instance if it's not in shared spaces. 744 if (annotations() != NULL && !annotations()->is_shared()) { 745 MetadataFactory::free_metadata(loader_data, annotations()); 746 } 747 set_annotations(NULL); 748 749 SystemDictionaryShared::handle_class_unloading(this); 750 } 751 752 bool InstanceKlass::is_record() const { 753 return _record_components != NULL && 754 is_final() && 755 java_super() == vmClasses::Record_klass(); 756 } 757 758 bool InstanceKlass::is_sealed() const { 759 return _permitted_subclasses != NULL && 760 _permitted_subclasses != Universe::the_empty_short_array(); 761 } 762 763 bool InstanceKlass::should_be_initialized() const { 764 return !is_initialized(); 765 } 766 767 klassItable InstanceKlass::itable() const { 768 return klassItable(const_cast<InstanceKlass*>(this)); 769 } 770 771 // JVMTI spec thinks there are signers and protection domain in the 772 // instanceKlass. These accessors pretend these fields are there. 773 // The hprof specification also thinks these fields are in InstanceKlass. 774 oop InstanceKlass::protection_domain() const { 775 // return the protection_domain from the mirror 776 return java_lang_Class::protection_domain(java_mirror()); 777 } 778 779 objArrayOop InstanceKlass::signers() const { 780 // return the signers from the mirror 781 return java_lang_Class::signers(java_mirror()); 782 } 783 784 // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization 785 // process. The step comments refers to the procedure described in that section. 786 // Note: implementation moved to static method to expose the this pointer. 787 void InstanceKlass::initialize(TRAPS) { 788 if (this->should_be_initialized()) { 789 initialize_impl(CHECK); 790 // Note: at this point the class may be initialized 791 // OR it may be in the state of being initialized 792 // in case of recursive initialization! 793 } else { 794 assert(is_initialized(), "sanity check"); 795 } 796 } 797 798 799 bool InstanceKlass::verify_code(TRAPS) { 800 // 1) Verify the bytecodes 801 return Verifier::verify(this, should_verify_class(), THREAD); 802 } 803 804 void InstanceKlass::link_class(TRAPS) { 805 assert(is_loaded(), "must be loaded"); 806 if (!is_linked()) { 807 link_class_impl(CHECK); 808 } 809 } 810 811 void InstanceKlass::check_link_state_and_wait(JavaThread* current) { 812 MonitorLocker ml(current, _init_monitor); 813 814 // Another thread is linking this class, wait. 815 while (is_being_linked() && !is_init_thread(current)) { 816 ml.wait(); 817 } 818 819 // This thread is recursively linking this class, continue 820 if (is_being_linked() && is_init_thread(current)) { 821 return; 822 } 823 824 // If this class wasn't linked already, set state to being_linked 825 if (!is_linked()) { 826 set_init_state(being_linked); 827 set_init_thread(current); 828 } 829 } 830 831 // Called to verify that a class can link during initialization, without 832 // throwing a VerifyError. 833 bool InstanceKlass::link_class_or_fail(TRAPS) { 834 assert(is_loaded(), "must be loaded"); 835 if (!is_linked()) { 836 link_class_impl(CHECK_false); 837 } 838 return is_linked(); 839 } 840 841 bool InstanceKlass::link_class_impl(TRAPS) { 842 if (DumpSharedSpaces && SystemDictionaryShared::has_class_failed_verification(this)) { 843 // This is for CDS dumping phase only -- we use the in_error_state to indicate that 844 // the class has failed verification. Throwing the NoClassDefFoundError here is just 845 // a convenient way to stop repeat attempts to verify the same (bad) class. 846 // 847 // Note that the NoClassDefFoundError is not part of the JLS, and should not be thrown 848 // if we are executing Java code. This is not a problem for CDS dumping phase since 849 // it doesn't execute any Java code. 850 ResourceMark rm(THREAD); 851 Exceptions::fthrow(THREAD_AND_LOCATION, 852 vmSymbols::java_lang_NoClassDefFoundError(), 853 "Class %s, or one of its supertypes, failed class initialization", 854 external_name()); 855 return false; 856 } 857 // return if already verified 858 if (is_linked()) { 859 return true; 860 } 861 862 // Timing 863 // timer handles recursion 864 JavaThread* jt = THREAD; 865 866 // link super class before linking this class 867 Klass* super_klass = super(); 868 if (super_klass != NULL) { 869 if (super_klass->is_interface()) { // check if super class is an interface 870 ResourceMark rm(THREAD); 871 Exceptions::fthrow( 872 THREAD_AND_LOCATION, 873 vmSymbols::java_lang_IncompatibleClassChangeError(), 874 "class %s has interface %s as super class", 875 external_name(), 876 super_klass->external_name() 877 ); 878 return false; 879 } 880 881 InstanceKlass* ik_super = InstanceKlass::cast(super_klass); 882 ik_super->link_class_impl(CHECK_false); 883 } 884 885 // link all interfaces implemented by this class before linking this class 886 Array<InstanceKlass*>* interfaces = local_interfaces(); 887 int num_interfaces = interfaces->length(); 888 for (int index = 0; index < num_interfaces; index++) { 889 InstanceKlass* interk = interfaces->at(index); 890 interk->link_class_impl(CHECK_false); 891 } 892 893 894 // If a class declares a method that uses an inline class as an argument 895 // type or return inline type, this inline class must be loaded during the 896 // linking of this class because size and properties of the inline class 897 // must be known in order to be able to perform inline type optimizations. 898 // The implementation below is an approximation of this rule, the code 899 // iterates over all methods of the current class (including overridden 900 // methods), not only the methods declared by this class. This 901 // approximation makes the code simpler, and doesn't change the semantic 902 // because classes declaring methods overridden by the current class are 903 // linked (and have performed their own pre-loading) before the linking 904 // of the current class. 905 906 907 // Note: 908 // Inline class types are loaded during 909 // the loading phase (see ClassFileParser::post_process_parsed_stream()). 910 // Inline class types used as element types for array creation 911 // are not pre-loaded. Their loading is triggered by either anewarray 912 // or multianewarray bytecodes. 913 914 // Could it be possible to do the following processing only if the 915 // class uses inline types? 916 if (EnableValhalla) { 917 ResourceMark rm(THREAD); 918 if (EnablePrimitiveClasses) { 919 for (int i = 0; i < methods()->length(); i++) { 920 Method* m = methods()->at(i); 921 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) { 922 if (ss.is_reference()) { 923 if (ss.is_array()) { 924 continue; 925 } 926 if (ss.type() == T_PRIMITIVE_OBJECT) { 927 Symbol* symb = ss.as_symbol(); 928 if (symb == name()) continue; 929 oop loader = class_loader(); 930 oop protection_domain = this->protection_domain(); 931 Klass* klass = SystemDictionary::resolve_or_fail(symb, 932 Handle(THREAD, loader), Handle(THREAD, protection_domain), true, 933 CHECK_false); 934 if (klass == NULL) { 935 THROW_(vmSymbols::java_lang_LinkageError(), false); 936 } 937 if (!klass->is_inline_klass()) { 938 Exceptions::fthrow( 939 THREAD_AND_LOCATION, 940 vmSymbols::java_lang_IncompatibleClassChangeError(), 941 "class %s is not an inline type", 942 klass->external_name()); 943 } 944 } 945 } 946 } 947 } 948 } 949 // Aggressively preloading all classes from the Preload attribute 950 if (preload_classes() != NULL) { 951 for (int i = 0; i < preload_classes()->length(); i++) { 952 if (constants()->tag_at(preload_classes()->at(i)).is_klass()) continue; 953 Symbol* class_name = constants()->klass_at_noresolve(preload_classes()->at(i)); 954 if (class_name == name()) continue; 955 oop loader = class_loader(); 956 oop protection_domain = this->protection_domain(); 957 Klass* klass = SystemDictionary::resolve_or_null(class_name, 958 Handle(THREAD, loader), Handle(THREAD, protection_domain), THREAD); 959 if (HAS_PENDING_EXCEPTION) { 960 CLEAR_PENDING_EXCEPTION; 961 } 962 if (klass != NULL) { 963 log_info(class, preload)("Preloading class %s during linking of class %s because of its Preload attribute", class_name->as_C_string(), name()->as_C_string()); 964 } else { 965 log_warning(class, preload)("Preloading of class %s during linking of class %s (Preload attribute) failed", class_name->as_C_string(), name()->as_C_string()); 966 } 967 } 968 } 969 } 970 971 // in case the class is linked in the process of linking its superclasses 972 if (is_linked()) { 973 return true; 974 } 975 976 // trace only the link time for this klass that includes 977 // the verification time 978 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(), 979 ClassLoader::perf_class_link_selftime(), 980 ClassLoader::perf_classes_linked(), 981 jt->get_thread_stat()->perf_recursion_counts_addr(), 982 jt->get_thread_stat()->perf_timers_addr(), 983 PerfClassTraceTime::CLASS_LINK); 984 985 // verification & rewriting 986 { 987 LockLinkState init_lock(this, jt); 988 989 // rewritten will have been set if loader constraint error found 990 // on an earlier link attempt 991 // don't verify or rewrite if already rewritten 992 // 993 994 if (!is_linked()) { 995 if (!is_rewritten()) { 996 if (is_shared()) { 997 assert(!verified_at_dump_time(), "must be"); 998 } 999 { 1000 bool verify_ok = verify_code(THREAD); 1001 if (!verify_ok) { 1002 return false; 1003 } 1004 } 1005 1006 // Just in case a side-effect of verify linked this class already 1007 // (which can sometimes happen since the verifier loads classes 1008 // using custom class loaders, which are free to initialize things) 1009 if (is_linked()) { 1010 return true; 1011 } 1012 1013 // also sets rewritten 1014 rewrite_class(CHECK_false); 1015 } else if (is_shared()) { 1016 SystemDictionaryShared::check_verification_constraints(this, CHECK_false); 1017 } 1018 1019 // relocate jsrs and link methods after they are all rewritten 1020 link_methods(CHECK_false); 1021 1022 // Initialize the vtable and interface table after 1023 // methods have been rewritten since rewrite may 1024 // fabricate new Method*s. 1025 // also does loader constraint checking 1026 // 1027 // initialize_vtable and initialize_itable need to be rerun 1028 // for a shared class if 1029 // 1) the class is loaded by custom class loader or 1030 // 2) the class is loaded by built-in class loader but failed to add archived loader constraints or 1031 // 3) the class was not verified during dump time 1032 bool need_init_table = true; 1033 if (is_shared() && verified_at_dump_time() && 1034 SystemDictionaryShared::check_linking_constraints(THREAD, this)) { 1035 need_init_table = false; 1036 } 1037 if (need_init_table) { 1038 vtable().initialize_vtable_and_check_constraints(CHECK_false); 1039 itable().initialize_itable_and_check_constraints(CHECK_false); 1040 } 1041 #ifdef ASSERT 1042 vtable().verify(tty, true); 1043 // In case itable verification is ever added. 1044 // itable().verify(tty, true); 1045 #endif 1046 set_initialization_state_and_notify(linked, THREAD); 1047 if (JvmtiExport::should_post_class_prepare()) { 1048 JvmtiExport::post_class_prepare(THREAD, this); 1049 } 1050 } 1051 } 1052 return true; 1053 } 1054 1055 // Rewrite the byte codes of all of the methods of a class. 1056 // The rewriter must be called exactly once. Rewriting must happen after 1057 // verification but before the first method of the class is executed. 1058 void InstanceKlass::rewrite_class(TRAPS) { 1059 assert(is_loaded(), "must be loaded"); 1060 if (is_rewritten()) { 1061 assert(is_shared(), "rewriting an unshared class?"); 1062 return; 1063 } 1064 Rewriter::rewrite(this, CHECK); 1065 set_rewritten(); 1066 } 1067 1068 // Now relocate and link method entry points after class is rewritten. 1069 // This is outside is_rewritten flag. In case of an exception, it can be 1070 // executed more than once. 1071 void InstanceKlass::link_methods(TRAPS) { 1072 int len = methods()->length(); 1073 for (int i = len-1; i >= 0; i--) { 1074 methodHandle m(THREAD, methods()->at(i)); 1075 1076 // Set up method entry points for compiler and interpreter . 1077 m->link_method(m, CHECK); 1078 } 1079 } 1080 1081 // Eagerly initialize superinterfaces that declare default methods (concrete instance: any access) 1082 void InstanceKlass::initialize_super_interfaces(TRAPS) { 1083 assert (has_nonstatic_concrete_methods(), "caller should have checked this"); 1084 for (int i = 0; i < local_interfaces()->length(); ++i) { 1085 InstanceKlass* ik = local_interfaces()->at(i); 1086 1087 // Initialization is depth first search ie. we start with top of the inheritance tree 1088 // has_nonstatic_concrete_methods drives searching superinterfaces since it 1089 // means has_nonstatic_concrete_methods in its superinterface hierarchy 1090 if (ik->has_nonstatic_concrete_methods()) { 1091 ik->initialize_super_interfaces(CHECK); 1092 } 1093 1094 // Only initialize() interfaces that "declare" concrete methods. 1095 if (ik->should_be_initialized() && ik->declares_nonstatic_concrete_methods()) { 1096 ik->initialize(CHECK); 1097 } 1098 } 1099 } 1100 1101 ResourceHashtable<const InstanceKlass*, OopHandle, 107, AnyObj::C_HEAP, mtClass> 1102 _initialization_error_table; 1103 1104 void InstanceKlass::add_initialization_error(JavaThread* current, Handle exception) { 1105 // Create the same exception with a message indicating the thread name, 1106 // and the StackTraceElements. 1107 // If the initialization error is OOM, this might not work, but if GC kicks in 1108 // this would be still be helpful. 1109 JavaThread* THREAD = current; 1110 Handle cause = java_lang_Throwable::get_cause_with_stack_trace(exception, THREAD); 1111 if (HAS_PENDING_EXCEPTION || cause.is_null()) { 1112 CLEAR_PENDING_EXCEPTION; 1113 return; 1114 } 1115 1116 MutexLocker ml(THREAD, ClassInitError_lock); 1117 OopHandle elem = OopHandle(Universe::vm_global(), cause()); 1118 bool created = false; 1119 _initialization_error_table.put_if_absent(this, elem, &created); 1120 assert(created, "Initialization is single threaded"); 1121 ResourceMark rm(THREAD); 1122 log_trace(class, init)("Initialization error added for class %s", external_name()); 1123 } 1124 1125 oop InstanceKlass::get_initialization_error(JavaThread* current) { 1126 MutexLocker ml(current, ClassInitError_lock); 1127 OopHandle* h = _initialization_error_table.get(this); 1128 return (h != nullptr) ? h->resolve() : nullptr; 1129 } 1130 1131 // Need to remove entries for unloaded classes. 1132 void InstanceKlass::clean_initialization_error_table() { 1133 struct InitErrorTableCleaner { 1134 bool do_entry(const InstanceKlass* ik, OopHandle h) { 1135 if (!ik->is_loader_alive()) { 1136 h.release(Universe::vm_global()); 1137 return true; 1138 } else { 1139 return false; 1140 } 1141 } 1142 }; 1143 1144 assert_locked_or_safepoint(ClassInitError_lock); 1145 InitErrorTableCleaner cleaner; 1146 _initialization_error_table.unlink(&cleaner); 1147 } 1148 1149 void InstanceKlass::initialize_impl(TRAPS) { 1150 HandleMark hm(THREAD); 1151 1152 // Make sure klass is linked (verified) before initialization 1153 // A class could already be verified, since it has been reflected upon. 1154 link_class(CHECK); 1155 1156 DTRACE_CLASSINIT_PROBE(required, -1); 1157 1158 bool wait = false; 1159 bool throw_error = false; 1160 1161 JavaThread* jt = THREAD; 1162 1163 // refer to the JVM book page 47 for description of steps 1164 // Step 1 1165 { 1166 MonitorLocker ml(THREAD, _init_monitor); 1167 1168 // Step 2 1169 while (is_being_initialized() && !is_init_thread(jt)) { 1170 wait = true; 1171 jt->set_class_to_be_initialized(this); 1172 ml.wait(); 1173 jt->set_class_to_be_initialized(NULL); 1174 } 1175 1176 // Step 3 1177 if (is_being_initialized() && is_init_thread(jt)) { 1178 DTRACE_CLASSINIT_PROBE_WAIT(recursive, -1, wait); 1179 return; 1180 } 1181 1182 // Step 4 1183 if (is_initialized()) { 1184 DTRACE_CLASSINIT_PROBE_WAIT(concurrent, -1, wait); 1185 return; 1186 } 1187 1188 // Step 5 1189 if (is_in_error_state()) { 1190 throw_error = true; 1191 } else { 1192 1193 // Step 6 1194 set_init_state(being_initialized); 1195 set_init_thread(jt); 1196 } 1197 } 1198 1199 // Throw error outside lock 1200 if (throw_error) { 1201 DTRACE_CLASSINIT_PROBE_WAIT(erroneous, -1, wait); 1202 ResourceMark rm(THREAD); 1203 Handle cause(THREAD, get_initialization_error(THREAD)); 1204 1205 stringStream ss; 1206 ss.print("Could not initialize class %s", external_name()); 1207 if (cause.is_null()) { 1208 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), ss.as_string()); 1209 } else { 1210 THROW_MSG_CAUSE(vmSymbols::java_lang_NoClassDefFoundError(), 1211 ss.as_string(), cause); 1212 } 1213 } 1214 1215 // Pre-allocating an instance of the default value 1216 if (is_inline_klass()) { 1217 InlineKlass* vk = InlineKlass::cast(this); 1218 oop val = vk->allocate_instance(THREAD); 1219 if (HAS_PENDING_EXCEPTION) { 1220 Handle e(THREAD, PENDING_EXCEPTION); 1221 CLEAR_PENDING_EXCEPTION; 1222 { 1223 EXCEPTION_MARK; 1224 add_initialization_error(THREAD, e); 1225 // Locks object, set state, and notify all waiting threads 1226 set_initialization_state_and_notify(initialization_error, THREAD); 1227 CLEAR_PENDING_EXCEPTION; 1228 } 1229 THROW_OOP(e()); 1230 } 1231 vk->set_default_value(val); 1232 } 1233 1234 // Step 7 1235 // Next, if C is a class rather than an interface, initialize it's super class and super 1236 // interfaces. 1237 if (!is_interface()) { 1238 Klass* super_klass = super(); 1239 if (super_klass != NULL && super_klass->should_be_initialized()) { 1240 super_klass->initialize(THREAD); 1241 } 1242 // If C implements any interface that declares a non-static, concrete method, 1243 // the initialization of C triggers initialization of its super interfaces. 1244 // Only need to recurse if has_nonstatic_concrete_methods which includes declaring and 1245 // having a superinterface that declares, non-static, concrete methods 1246 if (!HAS_PENDING_EXCEPTION && has_nonstatic_concrete_methods()) { 1247 initialize_super_interfaces(THREAD); 1248 } 1249 1250 // If any exceptions, complete abruptly, throwing the same exception as above. 1251 if (HAS_PENDING_EXCEPTION) { 1252 Handle e(THREAD, PENDING_EXCEPTION); 1253 CLEAR_PENDING_EXCEPTION; 1254 { 1255 EXCEPTION_MARK; 1256 add_initialization_error(THREAD, e); 1257 // Locks object, set state, and notify all waiting threads 1258 set_initialization_state_and_notify(initialization_error, THREAD); 1259 CLEAR_PENDING_EXCEPTION; 1260 } 1261 DTRACE_CLASSINIT_PROBE_WAIT(super__failed, -1, wait); 1262 THROW_OOP(e()); 1263 } 1264 } 1265 1266 // Step 8 1267 // Initialize classes of inline fields 1268 if (EnablePrimitiveClasses) { 1269 for (AllFieldStream fs(this); !fs.done(); fs.next()) { 1270 if (Signature::basic_type(fs.signature()) == T_PRIMITIVE_OBJECT) { 1271 Klass* klass = get_inline_type_field_klass_or_null(fs.index()); 1272 if (fs.access_flags().is_static() && klass == NULL) { 1273 klass = SystemDictionary::resolve_or_fail(field_signature(fs.index())->fundamental_name(THREAD), 1274 Handle(THREAD, class_loader()), 1275 Handle(THREAD, protection_domain()), 1276 true, THREAD); 1277 set_inline_type_field_klass(fs.index(), klass); 1278 } 1279 1280 if (!HAS_PENDING_EXCEPTION) { 1281 assert(klass != NULL, "Must be"); 1282 InstanceKlass::cast(klass)->initialize(THREAD); 1283 if (fs.access_flags().is_static()) { 1284 if (java_mirror()->obj_field(fs.offset()) == NULL) { 1285 java_mirror()->obj_field_put(fs.offset(), InlineKlass::cast(klass)->default_value()); 1286 } 1287 } 1288 } 1289 1290 if (HAS_PENDING_EXCEPTION) { 1291 Handle e(THREAD, PENDING_EXCEPTION); 1292 CLEAR_PENDING_EXCEPTION; 1293 { 1294 EXCEPTION_MARK; 1295 add_initialization_error(THREAD, e); 1296 // Locks object, set state, and notify all waiting threads 1297 set_initialization_state_and_notify(initialization_error, THREAD); 1298 CLEAR_PENDING_EXCEPTION; 1299 } 1300 THROW_OOP(e()); 1301 } 1302 } 1303 } 1304 } 1305 1306 1307 // Step 9 1308 { 1309 DTRACE_CLASSINIT_PROBE_WAIT(clinit, -1, wait); 1310 if (class_initializer() != NULL) { 1311 // Timer includes any side effects of class initialization (resolution, 1312 // etc), but not recursive entry into call_class_initializer(). 1313 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(), 1314 ClassLoader::perf_class_init_selftime(), 1315 ClassLoader::perf_classes_inited(), 1316 jt->get_thread_stat()->perf_recursion_counts_addr(), 1317 jt->get_thread_stat()->perf_timers_addr(), 1318 PerfClassTraceTime::CLASS_CLINIT); 1319 call_class_initializer(THREAD); 1320 } else { 1321 // The elapsed time is so small it's not worth counting. 1322 if (UsePerfData) { 1323 ClassLoader::perf_classes_inited()->inc(); 1324 } 1325 call_class_initializer(THREAD); 1326 } 1327 } 1328 1329 // Step 10 1330 if (!HAS_PENDING_EXCEPTION) { 1331 set_initialization_state_and_notify(fully_initialized, THREAD); 1332 debug_only(vtable().verify(tty, true);) 1333 } 1334 else { 1335 // Step 11 and 12 1336 Handle e(THREAD, PENDING_EXCEPTION); 1337 CLEAR_PENDING_EXCEPTION; 1338 // JVMTI has already reported the pending exception 1339 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError 1340 JvmtiExport::clear_detected_exception(jt); 1341 { 1342 EXCEPTION_MARK; 1343 add_initialization_error(THREAD, e); 1344 set_initialization_state_and_notify(initialization_error, THREAD); 1345 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below 1346 // JVMTI has already reported the pending exception 1347 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError 1348 JvmtiExport::clear_detected_exception(jt); 1349 } 1350 DTRACE_CLASSINIT_PROBE_WAIT(error, -1, wait); 1351 if (e->is_a(vmClasses::Error_klass())) { 1352 THROW_OOP(e()); 1353 } else { 1354 JavaCallArguments args(e); 1355 THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(), 1356 vmSymbols::throwable_void_signature(), 1357 &args); 1358 } 1359 } 1360 DTRACE_CLASSINIT_PROBE_WAIT(end, -1, wait); 1361 } 1362 1363 1364 void InstanceKlass::set_initialization_state_and_notify(ClassState state, JavaThread* current) { 1365 MonitorLocker ml(current, _init_monitor); 1366 1367 // Now flush all code that assume the class is not linked. 1368 // Set state under the Compile_lock also. 1369 if (state == linked && UseVtableBasedCHA && Universe::is_fully_initialized()) { 1370 MutexLocker ml(current, Compile_lock); 1371 1372 set_init_thread(NULL); // reset _init_thread before changing _init_state 1373 set_init_state(state); 1374 1375 CodeCache::flush_dependents_on(this); 1376 } else { 1377 set_init_thread(NULL); // reset _init_thread before changing _init_state 1378 set_init_state(state); 1379 } 1380 ml.notify_all(); 1381 } 1382 1383 InstanceKlass* InstanceKlass::implementor() const { 1384 InstanceKlass* volatile* ik = adr_implementor(); 1385 if (ik == NULL) { 1386 return NULL; 1387 } else { 1388 // This load races with inserts, and therefore needs acquire. 1389 InstanceKlass* ikls = Atomic::load_acquire(ik); 1390 if (ikls != NULL && !ikls->is_loader_alive()) { 1391 return NULL; // don't return unloaded class 1392 } else { 1393 return ikls; 1394 } 1395 } 1396 } 1397 1398 1399 void InstanceKlass::set_implementor(InstanceKlass* ik) { 1400 assert_locked_or_safepoint(Compile_lock); 1401 assert(is_interface(), "not interface"); 1402 InstanceKlass* volatile* addr = adr_implementor(); 1403 assert(addr != NULL, "null addr"); 1404 if (addr != NULL) { 1405 Atomic::release_store(addr, ik); 1406 } 1407 } 1408 1409 int InstanceKlass::nof_implementors() const { 1410 InstanceKlass* ik = implementor(); 1411 if (ik == NULL) { 1412 return 0; 1413 } else if (ik != this) { 1414 return 1; 1415 } else { 1416 return 2; 1417 } 1418 } 1419 1420 // The embedded _implementor field can only record one implementor. 1421 // When there are more than one implementors, the _implementor field 1422 // is set to the interface Klass* itself. Following are the possible 1423 // values for the _implementor field: 1424 // NULL - no implementor 1425 // implementor Klass* - one implementor 1426 // self - more than one implementor 1427 // 1428 // The _implementor field only exists for interfaces. 1429 void InstanceKlass::add_implementor(InstanceKlass* ik) { 1430 if (Universe::is_fully_initialized()) { 1431 assert_lock_strong(Compile_lock); 1432 } 1433 assert(is_interface(), "not interface"); 1434 // Filter out my subinterfaces. 1435 // (Note: Interfaces are never on the subklass list.) 1436 if (ik->is_interface()) return; 1437 1438 // Filter out subclasses whose supers already implement me. 1439 // (Note: CHA must walk subclasses of direct implementors 1440 // in order to locate indirect implementors.) 1441 InstanceKlass* super_ik = ik->java_super(); 1442 if (super_ik != NULL && super_ik->implements_interface(this)) 1443 // We only need to check one immediate superclass, since the 1444 // implements_interface query looks at transitive_interfaces. 1445 // Any supers of the super have the same (or fewer) transitive_interfaces. 1446 return; 1447 1448 InstanceKlass* iklass = implementor(); 1449 if (iklass == NULL) { 1450 set_implementor(ik); 1451 } else if (iklass != this && iklass != ik) { 1452 // There is already an implementor. Use itself as an indicator of 1453 // more than one implementors. 1454 set_implementor(this); 1455 } 1456 1457 // The implementor also implements the transitive_interfaces 1458 for (int index = 0; index < local_interfaces()->length(); index++) { 1459 local_interfaces()->at(index)->add_implementor(ik); 1460 } 1461 } 1462 1463 void InstanceKlass::init_implementor() { 1464 if (is_interface()) { 1465 set_implementor(NULL); 1466 } 1467 } 1468 1469 1470 void InstanceKlass::process_interfaces() { 1471 // link this class into the implementors list of every interface it implements 1472 for (int i = local_interfaces()->length() - 1; i >= 0; i--) { 1473 assert(local_interfaces()->at(i)->is_klass(), "must be a klass"); 1474 InstanceKlass* interf = local_interfaces()->at(i); 1475 assert(interf->is_interface(), "expected interface"); 1476 interf->add_implementor(this); 1477 } 1478 } 1479 1480 bool InstanceKlass::can_be_primary_super_slow() const { 1481 if (is_interface()) 1482 return false; 1483 else 1484 return Klass::can_be_primary_super_slow(); 1485 } 1486 1487 GrowableArray<Klass*>* InstanceKlass::compute_secondary_supers(int num_extra_slots, 1488 Array<InstanceKlass*>* transitive_interfaces) { 1489 // The secondaries are the implemented interfaces. 1490 Array<InstanceKlass*>* interfaces = transitive_interfaces; 1491 int num_secondaries = num_extra_slots + interfaces->length(); 1492 if (num_secondaries == 0) { 1493 // Must share this for correct bootstrapping! 1494 set_secondary_supers(Universe::the_empty_klass_array()); 1495 return NULL; 1496 } else if (num_extra_slots == 0) { 1497 // The secondary super list is exactly the same as the transitive interfaces, so 1498 // let's use it instead of making a copy. 1499 // Redefine classes has to be careful not to delete this! 1500 // We need the cast because Array<Klass*> is NOT a supertype of Array<InstanceKlass*>, 1501 // (but it's safe to do here because we won't write into _secondary_supers from this point on). 1502 set_secondary_supers((Array<Klass*>*)(address)interfaces); 1503 return NULL; 1504 } else { 1505 // Copy transitive interfaces to a temporary growable array to be constructed 1506 // into the secondary super list with extra slots. 1507 GrowableArray<Klass*>* secondaries = new GrowableArray<Klass*>(interfaces->length()); 1508 for (int i = 0; i < interfaces->length(); i++) { 1509 secondaries->push(interfaces->at(i)); 1510 } 1511 return secondaries; 1512 } 1513 } 1514 1515 bool InstanceKlass::implements_interface(Klass* k) const { 1516 if (this == k) return true; 1517 assert(k->is_interface(), "should be an interface class"); 1518 for (int i = 0; i < transitive_interfaces()->length(); i++) { 1519 if (transitive_interfaces()->at(i) == k) { 1520 return true; 1521 } 1522 } 1523 return false; 1524 } 1525 1526 bool InstanceKlass::is_same_or_direct_interface(Klass *k) const { 1527 // Verify direct super interface 1528 if (this == k) return true; 1529 assert(k->is_interface(), "should be an interface class"); 1530 for (int i = 0; i < local_interfaces()->length(); i++) { 1531 if (local_interfaces()->at(i) == k) { 1532 return true; 1533 } 1534 } 1535 return false; 1536 } 1537 1538 objArrayOop InstanceKlass::allocate_objArray(int n, int length, TRAPS) { 1539 check_array_allocation_length(length, arrayOopDesc::max_array_length(T_OBJECT), CHECK_NULL); 1540 size_t size = objArrayOopDesc::object_size(length); 1541 Klass* ak = array_klass(n, CHECK_NULL); 1542 objArrayOop o = (objArrayOop)Universe::heap()->array_allocate(ak, size, length, 1543 /* do_zero */ true, CHECK_NULL); 1544 return o; 1545 } 1546 1547 instanceOop InstanceKlass::register_finalizer(instanceOop i, TRAPS) { 1548 if (TraceFinalizerRegistration) { 1549 tty->print("Registered "); 1550 i->print_value_on(tty); 1551 tty->print_cr(" (" PTR_FORMAT ") as finalizable", p2i(i)); 1552 } 1553 instanceHandle h_i(THREAD, i); 1554 // Pass the handle as argument, JavaCalls::call expects oop as jobjects 1555 JavaValue result(T_VOID); 1556 JavaCallArguments args(h_i); 1557 methodHandle mh(THREAD, Universe::finalizer_register_method()); 1558 JavaCalls::call(&result, mh, &args, CHECK_NULL); 1559 MANAGEMENT_ONLY(FinalizerService::on_register(h_i(), THREAD);) 1560 return h_i(); 1561 } 1562 1563 instanceOop InstanceKlass::allocate_instance(TRAPS) { 1564 bool has_finalizer_flag = has_finalizer(); // Query before possible GC 1565 size_t size = size_helper(); // Query before forming handle. 1566 1567 instanceOop i; 1568 1569 i = (instanceOop)Universe::heap()->obj_allocate(this, size, CHECK_NULL); 1570 if (has_finalizer_flag && !RegisterFinalizersAtInit) { 1571 i = register_finalizer(i, CHECK_NULL); 1572 } 1573 return i; 1574 } 1575 1576 instanceHandle InstanceKlass::allocate_instance_handle(TRAPS) { 1577 return instanceHandle(THREAD, allocate_instance(THREAD)); 1578 } 1579 1580 void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) { 1581 if (is_interface() || is_abstract()) { 1582 ResourceMark rm(THREAD); 1583 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError() 1584 : vmSymbols::java_lang_InstantiationException(), external_name()); 1585 } 1586 if (this == vmClasses::Class_klass()) { 1587 ResourceMark rm(THREAD); 1588 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError() 1589 : vmSymbols::java_lang_IllegalAccessException(), external_name()); 1590 } 1591 } 1592 1593 Klass* InstanceKlass::array_klass(int n, TRAPS) { 1594 // Need load-acquire for lock-free read 1595 if (array_klasses_acquire() == NULL) { 1596 ResourceMark rm(THREAD); 1597 JavaThread *jt = THREAD; 1598 { 1599 // Atomic creation of array_klasses 1600 MutexLocker ma(THREAD, MultiArray_lock); 1601 1602 // Check if update has already taken place 1603 if (array_klasses() == NULL) { 1604 ObjArrayKlass* k = ObjArrayKlass::allocate_objArray_klass(class_loader_data(), 1, this, 1605 false, false, CHECK_NULL); 1606 // use 'release' to pair with lock-free load 1607 release_set_array_klasses(k); 1608 } 1609 } 1610 } 1611 // array_klasses() will always be set at this point 1612 ArrayKlass* ak = array_klasses(); 1613 return ak->array_klass(n, THREAD); 1614 } 1615 1616 Klass* InstanceKlass::array_klass_or_null(int n) { 1617 // Need load-acquire for lock-free read 1618 ArrayKlass* ak = array_klasses_acquire(); 1619 if (ak == NULL) { 1620 return NULL; 1621 } else { 1622 return ak->array_klass_or_null(n); 1623 } 1624 } 1625 1626 Klass* InstanceKlass::array_klass(TRAPS) { 1627 return array_klass(1, THREAD); 1628 } 1629 1630 Klass* InstanceKlass::array_klass_or_null() { 1631 return array_klass_or_null(1); 1632 } 1633 1634 static int call_class_initializer_counter = 0; // for debugging 1635 1636 Method* InstanceKlass::class_initializer() const { 1637 Method* clinit = find_method( 1638 vmSymbols::class_initializer_name(), vmSymbols::void_method_signature()); 1639 if (clinit != NULL && clinit->is_class_initializer()) { 1640 return clinit; 1641 } 1642 return NULL; 1643 } 1644 1645 void InstanceKlass::call_class_initializer(TRAPS) { 1646 if (ReplayCompiles && 1647 (ReplaySuppressInitializers == 1 || 1648 (ReplaySuppressInitializers >= 2 && class_loader() != NULL))) { 1649 // Hide the existence of the initializer for the purpose of replaying the compile 1650 return; 1651 } 1652 1653 #if INCLUDE_CDS 1654 // This is needed to ensure the consistency of the archived heap objects. 1655 if (has_archived_enum_objs()) { 1656 assert(is_shared(), "must be"); 1657 bool initialized = HeapShared::initialize_enum_klass(this, CHECK); 1658 if (initialized) { 1659 return; 1660 } 1661 } 1662 #endif 1663 1664 methodHandle h_method(THREAD, class_initializer()); 1665 assert(!is_initialized(), "we cannot initialize twice"); 1666 LogTarget(Info, class, init) lt; 1667 if (lt.is_enabled()) { 1668 ResourceMark rm(THREAD); 1669 LogStream ls(lt); 1670 ls.print("%d Initializing ", call_class_initializer_counter++); 1671 name()->print_value_on(&ls); 1672 ls.print_cr("%s (" PTR_FORMAT ")", h_method() == NULL ? "(no method)" : "", p2i(this)); 1673 } 1674 if (h_method() != NULL) { 1675 JavaCallArguments args; // No arguments 1676 JavaValue result(T_VOID); 1677 JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args) 1678 } 1679 } 1680 1681 1682 void InstanceKlass::mask_for(const methodHandle& method, int bci, 1683 InterpreterOopMap* entry_for) { 1684 // Lazily create the _oop_map_cache at first request 1685 // Lock-free access requires load_acquire. 1686 OopMapCache* oop_map_cache = Atomic::load_acquire(&_oop_map_cache); 1687 if (oop_map_cache == NULL) { 1688 MutexLocker x(OopMapCacheAlloc_lock, Mutex::_no_safepoint_check_flag); 1689 // Check if _oop_map_cache was allocated while we were waiting for this lock 1690 if ((oop_map_cache = _oop_map_cache) == NULL) { 1691 oop_map_cache = new OopMapCache(); 1692 // Ensure _oop_map_cache is stable, since it is examined without a lock 1693 Atomic::release_store(&_oop_map_cache, oop_map_cache); 1694 } 1695 } 1696 // _oop_map_cache is constant after init; lookup below does its own locking. 1697 oop_map_cache->lookup(method, bci, entry_for); 1698 } 1699 1700 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { 1701 for (JavaFieldStream fs(this); !fs.done(); fs.next()) { 1702 Symbol* f_name = fs.name(); 1703 Symbol* f_sig = fs.signature(); 1704 if (f_name == name && f_sig == sig) { 1705 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index()); 1706 return true; 1707 } 1708 } 1709 return false; 1710 } 1711 1712 1713 Klass* InstanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { 1714 const int n = local_interfaces()->length(); 1715 for (int i = 0; i < n; i++) { 1716 Klass* intf1 = local_interfaces()->at(i); 1717 assert(intf1->is_interface(), "just checking type"); 1718 // search for field in current interface 1719 if (InstanceKlass::cast(intf1)->find_local_field(name, sig, fd)) { 1720 assert(fd->is_static(), "interface field must be static"); 1721 return intf1; 1722 } 1723 // search for field in direct superinterfaces 1724 Klass* intf2 = InstanceKlass::cast(intf1)->find_interface_field(name, sig, fd); 1725 if (intf2 != NULL) return intf2; 1726 } 1727 // otherwise field lookup fails 1728 return NULL; 1729 } 1730 1731 1732 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { 1733 // search order according to newest JVM spec (5.4.3.2, p.167). 1734 // 1) search for field in current klass 1735 if (find_local_field(name, sig, fd)) { 1736 return const_cast<InstanceKlass*>(this); 1737 } 1738 // 2) search for field recursively in direct superinterfaces 1739 { Klass* intf = find_interface_field(name, sig, fd); 1740 if (intf != NULL) return intf; 1741 } 1742 // 3) apply field lookup recursively if superclass exists 1743 { Klass* supr = super(); 1744 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, fd); 1745 } 1746 // 4) otherwise field lookup fails 1747 return NULL; 1748 } 1749 1750 1751 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const { 1752 // search order according to newest JVM spec (5.4.3.2, p.167). 1753 // 1) search for field in current klass 1754 if (find_local_field(name, sig, fd)) { 1755 if (fd->is_static() == is_static) return const_cast<InstanceKlass*>(this); 1756 } 1757 // 2) search for field recursively in direct superinterfaces 1758 if (is_static) { 1759 Klass* intf = find_interface_field(name, sig, fd); 1760 if (intf != NULL) return intf; 1761 } 1762 // 3) apply field lookup recursively if superclass exists 1763 { Klass* supr = super(); 1764 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, is_static, fd); 1765 } 1766 // 4) otherwise field lookup fails 1767 return NULL; 1768 } 1769 1770 bool InstanceKlass::contains_field_offset(int offset) { 1771 if (this->is_inline_klass()) { 1772 InlineKlass* vk = InlineKlass::cast(this); 1773 return offset >= vk->first_field_offset() && offset < (vk->first_field_offset() + vk->get_exact_size_in_bytes()); 1774 } else { 1775 fieldDescriptor fd; 1776 return find_field_from_offset(offset, false, &fd); 1777 } 1778 } 1779 1780 bool InstanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const { 1781 for (JavaFieldStream fs(this); !fs.done(); fs.next()) { 1782 if (fs.offset() == offset) { 1783 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index()); 1784 if (fd->is_static() == is_static) return true; 1785 } 1786 } 1787 return false; 1788 } 1789 1790 1791 bool InstanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const { 1792 Klass* klass = const_cast<InstanceKlass*>(this); 1793 while (klass != NULL) { 1794 if (InstanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) { 1795 return true; 1796 } 1797 klass = klass->super(); 1798 } 1799 return false; 1800 } 1801 1802 1803 void InstanceKlass::methods_do(void f(Method* method)) { 1804 // Methods aren't stable until they are loaded. This can be read outside 1805 // a lock through the ClassLoaderData for profiling 1806 // Redefined scratch classes are on the list and need to be cleaned 1807 if (!is_loaded() && !is_scratch_class()) { 1808 return; 1809 } 1810 1811 int len = methods()->length(); 1812 for (int index = 0; index < len; index++) { 1813 Method* m = methods()->at(index); 1814 assert(m->is_method(), "must be method"); 1815 f(m); 1816 } 1817 } 1818 1819 1820 void InstanceKlass::do_local_static_fields(FieldClosure* cl) { 1821 for (JavaFieldStream fs(this); !fs.done(); fs.next()) { 1822 if (fs.access_flags().is_static()) { 1823 fieldDescriptor& fd = fs.field_descriptor(); 1824 cl->do_field(&fd); 1825 } 1826 } 1827 } 1828 1829 1830 void InstanceKlass::do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle mirror, TRAPS) { 1831 for (JavaFieldStream fs(this); !fs.done(); fs.next()) { 1832 if (fs.access_flags().is_static()) { 1833 fieldDescriptor& fd = fs.field_descriptor(); 1834 f(&fd, mirror, CHECK); 1835 } 1836 } 1837 } 1838 1839 void InstanceKlass::do_nonstatic_fields(FieldClosure* cl) { 1840 InstanceKlass* super = superklass(); 1841 if (super != NULL) { 1842 super->do_nonstatic_fields(cl); 1843 } 1844 fieldDescriptor fd; 1845 int length = java_fields_count(); 1846 for (int i = 0; i < length; i += 1) { 1847 fd.reinitialize(this, i); 1848 if (!fd.is_static()) { 1849 cl->do_field(&fd); 1850 } 1851 } 1852 } 1853 1854 // first in Pair is offset, second is index. 1855 static int compare_fields_by_offset(Pair<int,int>* a, Pair<int,int>* b) { 1856 return a->first - b->first; 1857 } 1858 1859 void InstanceKlass::print_nonstatic_fields(FieldClosure* cl) { 1860 InstanceKlass* super = superklass(); 1861 if (super != NULL) { 1862 super->print_nonstatic_fields(cl); 1863 } 1864 ResourceMark rm; 1865 fieldDescriptor fd; 1866 // In DebugInfo nonstatic fields are sorted by offset. 1867 GrowableArray<Pair<int,int> > fields_sorted; 1868 int i = 0; 1869 for (AllFieldStream fs(this); !fs.done(); fs.next()) { 1870 if (!fs.access_flags().is_static()) { 1871 fd = fs.field_descriptor(); 1872 Pair<int,int> f(fs.offset(), fs.index()); 1873 fields_sorted.push(f); 1874 i++; 1875 } 1876 } 1877 if (i > 0) { 1878 int length = i; 1879 assert(length == fields_sorted.length(), "duh"); 1880 // _sort_Fn is defined in growableArray.hpp. 1881 fields_sorted.sort(compare_fields_by_offset); 1882 for (int i = 0; i < length; i++) { 1883 fd.reinitialize(this, fields_sorted.at(i).second); 1884 assert(!fd.is_static() && fd.offset() == fields_sorted.at(i).first, "only nonstatic fields"); 1885 cl->do_field(&fd); 1886 } 1887 } 1888 } 1889 1890 #ifdef ASSERT 1891 static int linear_search(const Array<Method*>* methods, 1892 const Symbol* name, 1893 const Symbol* signature) { 1894 const int len = methods->length(); 1895 for (int index = 0; index < len; index++) { 1896 const Method* const m = methods->at(index); 1897 assert(m->is_method(), "must be method"); 1898 if (m->signature() == signature && m->name() == name) { 1899 return index; 1900 } 1901 } 1902 return -1; 1903 } 1904 #endif 1905 1906 bool InstanceKlass::_disable_method_binary_search = false; 1907 1908 NOINLINE int linear_search(const Array<Method*>* methods, const Symbol* name) { 1909 int len = methods->length(); 1910 int l = 0; 1911 int h = len - 1; 1912 while (l <= h) { 1913 Method* m = methods->at(l); 1914 if (m->name() == name) { 1915 return l; 1916 } 1917 l++; 1918 } 1919 return -1; 1920 } 1921 1922 inline int InstanceKlass::quick_search(const Array<Method*>* methods, const Symbol* name) { 1923 if (_disable_method_binary_search) { 1924 assert(DynamicDumpSharedSpaces, "must be"); 1925 // At the final stage of dynamic dumping, the methods array may not be sorted 1926 // by ascending addresses of their names, so we can't use binary search anymore. 1927 // However, methods with the same name are still laid out consecutively inside the 1928 // methods array, so let's look for the first one that matches. 1929 return linear_search(methods, name); 1930 } 1931 1932 int len = methods->length(); 1933 int l = 0; 1934 int h = len - 1; 1935 1936 // methods are sorted by ascending addresses of their names, so do binary search 1937 while (l <= h) { 1938 int mid = (l + h) >> 1; 1939 Method* m = methods->at(mid); 1940 assert(m->is_method(), "must be method"); 1941 int res = m->name()->fast_compare(name); 1942 if (res == 0) { 1943 return mid; 1944 } else if (res < 0) { 1945 l = mid + 1; 1946 } else { 1947 h = mid - 1; 1948 } 1949 } 1950 return -1; 1951 } 1952 1953 // find_method looks up the name/signature in the local methods array 1954 Method* InstanceKlass::find_method(const Symbol* name, 1955 const Symbol* signature) const { 1956 return find_method_impl(name, signature, 1957 OverpassLookupMode::find, 1958 StaticLookupMode::find, 1959 PrivateLookupMode::find); 1960 } 1961 1962 Method* InstanceKlass::find_method_impl(const Symbol* name, 1963 const Symbol* signature, 1964 OverpassLookupMode overpass_mode, 1965 StaticLookupMode static_mode, 1966 PrivateLookupMode private_mode) const { 1967 return InstanceKlass::find_method_impl(methods(), 1968 name, 1969 signature, 1970 overpass_mode, 1971 static_mode, 1972 private_mode); 1973 } 1974 1975 // find_instance_method looks up the name/signature in the local methods array 1976 // and skips over static methods 1977 Method* InstanceKlass::find_instance_method(const Array<Method*>* methods, 1978 const Symbol* name, 1979 const Symbol* signature, 1980 PrivateLookupMode private_mode) { 1981 Method* const meth = InstanceKlass::find_method_impl(methods, 1982 name, 1983 signature, 1984 OverpassLookupMode::find, 1985 StaticLookupMode::skip, 1986 private_mode); 1987 assert(((meth == NULL) || !meth->is_static()), 1988 "find_instance_method should have skipped statics"); 1989 return meth; 1990 } 1991 1992 // find_instance_method looks up the name/signature in the local methods array 1993 // and skips over static methods 1994 Method* InstanceKlass::find_instance_method(const Symbol* name, 1995 const Symbol* signature, 1996 PrivateLookupMode private_mode) const { 1997 return InstanceKlass::find_instance_method(methods(), name, signature, private_mode); 1998 } 1999 2000 // Find looks up the name/signature in the local methods array 2001 // and filters on the overpass, static and private flags 2002 // This returns the first one found 2003 // note that the local methods array can have up to one overpass, one static 2004 // and one instance (private or not) with the same name/signature 2005 Method* InstanceKlass::find_local_method(const Symbol* name, 2006 const Symbol* signature, 2007 OverpassLookupMode overpass_mode, 2008 StaticLookupMode static_mode, 2009 PrivateLookupMode private_mode) const { 2010 return InstanceKlass::find_method_impl(methods(), 2011 name, 2012 signature, 2013 overpass_mode, 2014 static_mode, 2015 private_mode); 2016 } 2017 2018 // Find looks up the name/signature in the local methods array 2019 // and filters on the overpass, static and private flags 2020 // This returns the first one found 2021 // note that the local methods array can have up to one overpass, one static 2022 // and one instance (private or not) with the same name/signature 2023 Method* InstanceKlass::find_local_method(const Array<Method*>* methods, 2024 const Symbol* name, 2025 const Symbol* signature, 2026 OverpassLookupMode overpass_mode, 2027 StaticLookupMode static_mode, 2028 PrivateLookupMode private_mode) { 2029 return InstanceKlass::find_method_impl(methods, 2030 name, 2031 signature, 2032 overpass_mode, 2033 static_mode, 2034 private_mode); 2035 } 2036 2037 Method* InstanceKlass::find_method(const Array<Method*>* methods, 2038 const Symbol* name, 2039 const Symbol* signature) { 2040 return InstanceKlass::find_method_impl(methods, 2041 name, 2042 signature, 2043 OverpassLookupMode::find, 2044 StaticLookupMode::find, 2045 PrivateLookupMode::find); 2046 } 2047 2048 Method* InstanceKlass::find_method_impl(const Array<Method*>* methods, 2049 const Symbol* name, 2050 const Symbol* signature, 2051 OverpassLookupMode overpass_mode, 2052 StaticLookupMode static_mode, 2053 PrivateLookupMode private_mode) { 2054 int hit = find_method_index(methods, name, signature, overpass_mode, static_mode, private_mode); 2055 return hit >= 0 ? methods->at(hit): NULL; 2056 } 2057 2058 // true if method matches signature and conforms to skipping_X conditions. 2059 static bool method_matches(const Method* m, 2060 const Symbol* signature, 2061 bool skipping_overpass, 2062 bool skipping_static, 2063 bool skipping_private) { 2064 return ((m->signature() == signature) && 2065 (!skipping_overpass || !m->is_overpass()) && 2066 (!skipping_static || !m->is_static()) && 2067 (!skipping_private || !m->is_private())); 2068 } 2069 2070 // Used directly for default_methods to find the index into the 2071 // default_vtable_indices, and indirectly by find_method 2072 // find_method_index looks in the local methods array to return the index 2073 // of the matching name/signature. If, overpass methods are being ignored, 2074 // the search continues to find a potential non-overpass match. This capability 2075 // is important during method resolution to prefer a static method, for example, 2076 // over an overpass method. 2077 // There is the possibility in any _method's array to have the same name/signature 2078 // for a static method, an overpass method and a local instance method 2079 // To correctly catch a given method, the search criteria may need 2080 // to explicitly skip the other two. For local instance methods, it 2081 // is often necessary to skip private methods 2082 int InstanceKlass::find_method_index(const Array<Method*>* methods, 2083 const Symbol* name, 2084 const Symbol* signature, 2085 OverpassLookupMode overpass_mode, 2086 StaticLookupMode static_mode, 2087 PrivateLookupMode private_mode) { 2088 const bool skipping_overpass = (overpass_mode == OverpassLookupMode::skip); 2089 const bool skipping_static = (static_mode == StaticLookupMode::skip); 2090 const bool skipping_private = (private_mode == PrivateLookupMode::skip); 2091 const int hit = quick_search(methods, name); 2092 if (hit != -1) { 2093 const Method* const m = methods->at(hit); 2094 2095 // Do linear search to find matching signature. First, quick check 2096 // for common case, ignoring overpasses if requested. 2097 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) { 2098 return hit; 2099 } 2100 2101 // search downwards through overloaded methods 2102 int i; 2103 for (i = hit - 1; i >= 0; --i) { 2104 const Method* const m = methods->at(i); 2105 assert(m->is_method(), "must be method"); 2106 if (m->name() != name) { 2107 break; 2108 } 2109 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) { 2110 return i; 2111 } 2112 } 2113 // search upwards 2114 for (i = hit + 1; i < methods->length(); ++i) { 2115 const Method* const m = methods->at(i); 2116 assert(m->is_method(), "must be method"); 2117 if (m->name() != name) { 2118 break; 2119 } 2120 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) { 2121 return i; 2122 } 2123 } 2124 // not found 2125 #ifdef ASSERT 2126 const int index = (skipping_overpass || skipping_static || skipping_private) ? -1 : 2127 linear_search(methods, name, signature); 2128 assert(-1 == index, "binary search should have found entry %d", index); 2129 #endif 2130 } 2131 return -1; 2132 } 2133 2134 int InstanceKlass::find_method_by_name(const Symbol* name, int* end) const { 2135 return find_method_by_name(methods(), name, end); 2136 } 2137 2138 int InstanceKlass::find_method_by_name(const Array<Method*>* methods, 2139 const Symbol* name, 2140 int* end_ptr) { 2141 assert(end_ptr != NULL, "just checking"); 2142 int start = quick_search(methods, name); 2143 int end = start + 1; 2144 if (start != -1) { 2145 while (start - 1 >= 0 && (methods->at(start - 1))->name() == name) --start; 2146 while (end < methods->length() && (methods->at(end))->name() == name) ++end; 2147 *end_ptr = end; 2148 return start; 2149 } 2150 return -1; 2151 } 2152 2153 // uncached_lookup_method searches both the local class methods array and all 2154 // superclasses methods arrays, skipping any overpass methods in superclasses, 2155 // and possibly skipping private methods. 2156 Method* InstanceKlass::uncached_lookup_method(const Symbol* name, 2157 const Symbol* signature, 2158 OverpassLookupMode overpass_mode, 2159 PrivateLookupMode private_mode) const { 2160 OverpassLookupMode overpass_local_mode = overpass_mode; 2161 const Klass* klass = this; 2162 while (klass != NULL) { 2163 Method* const method = InstanceKlass::cast(klass)->find_method_impl(name, 2164 signature, 2165 overpass_local_mode, 2166 StaticLookupMode::find, 2167 private_mode); 2168 if (method != NULL) { 2169 return method; 2170 } 2171 if (name == vmSymbols::object_initializer_name() || 2172 name == vmSymbols::inline_factory_name()) { 2173 break; // <init> and <vnew> is never inherited 2174 } 2175 klass = klass->super(); 2176 overpass_local_mode = OverpassLookupMode::skip; // Always ignore overpass methods in superclasses 2177 } 2178 return NULL; 2179 } 2180 2181 #ifdef ASSERT 2182 // search through class hierarchy and return true if this class or 2183 // one of the superclasses was redefined 2184 bool InstanceKlass::has_redefined_this_or_super() const { 2185 const Klass* klass = this; 2186 while (klass != NULL) { 2187 if (InstanceKlass::cast(klass)->has_been_redefined()) { 2188 return true; 2189 } 2190 klass = klass->super(); 2191 } 2192 return false; 2193 } 2194 #endif 2195 2196 // lookup a method in the default methods list then in all transitive interfaces 2197 // Do NOT return private or static methods 2198 Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name, 2199 Symbol* signature) const { 2200 Method* m = NULL; 2201 if (default_methods() != NULL) { 2202 m = find_method(default_methods(), name, signature); 2203 } 2204 // Look up interfaces 2205 if (m == NULL) { 2206 m = lookup_method_in_all_interfaces(name, signature, DefaultsLookupMode::find); 2207 } 2208 return m; 2209 } 2210 2211 // lookup a method in all the interfaces that this class implements 2212 // Do NOT return private or static methods, new in JDK8 which are not externally visible 2213 // They should only be found in the initial InterfaceMethodRef 2214 Method* InstanceKlass::lookup_method_in_all_interfaces(Symbol* name, 2215 Symbol* signature, 2216 DefaultsLookupMode defaults_mode) const { 2217 Array<InstanceKlass*>* all_ifs = transitive_interfaces(); 2218 int num_ifs = all_ifs->length(); 2219 InstanceKlass *ik = NULL; 2220 for (int i = 0; i < num_ifs; i++) { 2221 ik = all_ifs->at(i); 2222 Method* m = ik->lookup_method(name, signature); 2223 if (m != NULL && m->is_public() && !m->is_static() && 2224 ((defaults_mode != DefaultsLookupMode::skip) || !m->is_default_method())) { 2225 return m; 2226 } 2227 } 2228 return NULL; 2229 } 2230 2231 PrintClassClosure::PrintClassClosure(outputStream* st, bool verbose) 2232 :_st(st), _verbose(verbose) { 2233 ResourceMark rm; 2234 _st->print("%-18s ", "KlassAddr"); 2235 _st->print("%-4s ", "Size"); 2236 _st->print("%-20s ", "State"); 2237 _st->print("%-7s ", "Flags"); 2238 _st->print("%-5s ", "ClassName"); 2239 _st->cr(); 2240 } 2241 2242 void PrintClassClosure::do_klass(Klass* k) { 2243 ResourceMark rm; 2244 // klass pointer 2245 _st->print(PTR_FORMAT " ", p2i(k)); 2246 // klass size 2247 _st->print("%4d ", k->size()); 2248 // initialization state 2249 if (k->is_instance_klass()) { 2250 _st->print("%-20s ",InstanceKlass::cast(k)->init_state_name()); 2251 } else { 2252 _st->print("%-20s ",""); 2253 } 2254 // misc flags(Changes should synced with ClassesDCmd::ClassesDCmd help doc) 2255 char buf[10]; 2256 int i = 0; 2257 if (k->has_finalizer()) buf[i++] = 'F'; 2258 if (k->has_final_method()) buf[i++] = 'f'; 2259 if (k->is_instance_klass()) { 2260 InstanceKlass* ik = InstanceKlass::cast(k); 2261 if (ik->is_rewritten()) buf[i++] = 'W'; 2262 if (ik->is_contended()) buf[i++] = 'C'; 2263 if (ik->has_been_redefined()) buf[i++] = 'R'; 2264 if (ik->is_shared()) buf[i++] = 'S'; 2265 } 2266 buf[i++] = '\0'; 2267 _st->print("%-7s ", buf); 2268 // klass name 2269 _st->print("%-5s ", k->external_name()); 2270 // end 2271 _st->cr(); 2272 if (_verbose) { 2273 k->print_on(_st); 2274 } 2275 } 2276 2277 /* jni_id_for for jfieldIds only */ 2278 JNIid* InstanceKlass::jni_id_for(int offset) { 2279 MutexLocker ml(JfieldIdCreation_lock); 2280 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset); 2281 if (probe == NULL) { 2282 // Allocate new static field identifier 2283 probe = new JNIid(this, offset, jni_ids()); 2284 set_jni_ids(probe); 2285 } 2286 return probe; 2287 } 2288 2289 u2 InstanceKlass::enclosing_method_data(int offset) const { 2290 const Array<jushort>* const inner_class_list = inner_classes(); 2291 if (inner_class_list == NULL) { 2292 return 0; 2293 } 2294 const int length = inner_class_list->length(); 2295 if (length % inner_class_next_offset == 0) { 2296 return 0; 2297 } 2298 const int index = length - enclosing_method_attribute_size; 2299 assert(offset < enclosing_method_attribute_size, "invalid offset"); 2300 return inner_class_list->at(index + offset); 2301 } 2302 2303 void InstanceKlass::set_enclosing_method_indices(u2 class_index, 2304 u2 method_index) { 2305 Array<jushort>* inner_class_list = inner_classes(); 2306 assert (inner_class_list != NULL, "_inner_classes list is not set up"); 2307 int length = inner_class_list->length(); 2308 if (length % inner_class_next_offset == enclosing_method_attribute_size) { 2309 int index = length - enclosing_method_attribute_size; 2310 inner_class_list->at_put( 2311 index + enclosing_method_class_index_offset, class_index); 2312 inner_class_list->at_put( 2313 index + enclosing_method_method_index_offset, method_index); 2314 } 2315 } 2316 2317 // Lookup or create a jmethodID. 2318 // This code is called by the VMThread and JavaThreads so the 2319 // locking has to be done very carefully to avoid deadlocks 2320 // and/or other cache consistency problems. 2321 // 2322 jmethodID InstanceKlass::get_jmethod_id(const methodHandle& method_h) { 2323 size_t idnum = (size_t)method_h->method_idnum(); 2324 jmethodID* jmeths = methods_jmethod_ids_acquire(); 2325 size_t length = 0; 2326 jmethodID id = NULL; 2327 2328 // We use a double-check locking idiom here because this cache is 2329 // performance sensitive. In the normal system, this cache only 2330 // transitions from NULL to non-NULL which is safe because we use 2331 // release_set_methods_jmethod_ids() to advertise the new cache. 2332 // A partially constructed cache should never be seen by a racing 2333 // thread. We also use release_store() to save a new jmethodID 2334 // in the cache so a partially constructed jmethodID should never be 2335 // seen either. Cache reads of existing jmethodIDs proceed without a 2336 // lock, but cache writes of a new jmethodID requires uniqueness and 2337 // creation of the cache itself requires no leaks so a lock is 2338 // generally acquired in those two cases. 2339 // 2340 // If the RedefineClasses() API has been used, then this cache can 2341 // grow and we'll have transitions from non-NULL to bigger non-NULL. 2342 // Cache creation requires no leaks and we require safety between all 2343 // cache accesses and freeing of the old cache so a lock is generally 2344 // acquired when the RedefineClasses() API has been used. 2345 2346 if (jmeths != NULL) { 2347 // the cache already exists 2348 if (!idnum_can_increment()) { 2349 // the cache can't grow so we can just get the current values 2350 get_jmethod_id_length_value(jmeths, idnum, &length, &id); 2351 } else { 2352 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag); 2353 get_jmethod_id_length_value(jmeths, idnum, &length, &id); 2354 } 2355 } 2356 // implied else: 2357 // we need to allocate a cache so default length and id values are good 2358 2359 if (jmeths == NULL || // no cache yet 2360 length <= idnum || // cache is too short 2361 id == NULL) { // cache doesn't contain entry 2362 2363 // This function can be called by the VMThread or GC worker threads so we 2364 // have to do all things that might block on a safepoint before grabbing the lock. 2365 // Otherwise, we can deadlock with the VMThread or have a cache 2366 // consistency issue. These vars keep track of what we might have 2367 // to free after the lock is dropped. 2368 jmethodID to_dealloc_id = NULL; 2369 jmethodID* to_dealloc_jmeths = NULL; 2370 2371 // may not allocate new_jmeths or use it if we allocate it 2372 jmethodID* new_jmeths = NULL; 2373 if (length <= idnum) { 2374 // allocate a new cache that might be used 2375 size_t size = MAX2(idnum+1, (size_t)idnum_allocated_count()); 2376 new_jmeths = NEW_C_HEAP_ARRAY(jmethodID, size+1, mtClass); 2377 memset(new_jmeths, 0, (size+1)*sizeof(jmethodID)); 2378 // cache size is stored in element[0], other elements offset by one 2379 new_jmeths[0] = (jmethodID)size; 2380 } 2381 2382 // allocate a new jmethodID that might be used 2383 { 2384 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag); 2385 jmethodID new_id = NULL; 2386 if (method_h->is_old() && !method_h->is_obsolete()) { 2387 // The method passed in is old (but not obsolete), we need to use the current version 2388 Method* current_method = method_with_idnum((int)idnum); 2389 assert(current_method != NULL, "old and but not obsolete, so should exist"); 2390 new_id = Method::make_jmethod_id(class_loader_data(), current_method); 2391 } else { 2392 // It is the current version of the method or an obsolete method, 2393 // use the version passed in 2394 new_id = Method::make_jmethod_id(class_loader_data(), method_h()); 2395 } 2396 2397 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths, 2398 &to_dealloc_id, &to_dealloc_jmeths); 2399 } 2400 2401 // The lock has been dropped so we can free resources. 2402 // Free up either the old cache or the new cache if we allocated one. 2403 if (to_dealloc_jmeths != NULL) { 2404 FreeHeap(to_dealloc_jmeths); 2405 } 2406 // free up the new ID since it wasn't needed 2407 if (to_dealloc_id != NULL) { 2408 Method::destroy_jmethod_id(class_loader_data(), to_dealloc_id); 2409 } 2410 } 2411 return id; 2412 } 2413 2414 // Figure out how many jmethodIDs haven't been allocated, and make 2415 // sure space for them is pre-allocated. This makes getting all 2416 // method ids much, much faster with classes with more than 8 2417 // methods, and has a *substantial* effect on performance with jvmti 2418 // code that loads all jmethodIDs for all classes. 2419 void InstanceKlass::ensure_space_for_methodids(int start_offset) { 2420 int new_jmeths = 0; 2421 int length = methods()->length(); 2422 for (int index = start_offset; index < length; index++) { 2423 Method* m = methods()->at(index); 2424 jmethodID id = m->find_jmethod_id_or_null(); 2425 if (id == NULL) { 2426 new_jmeths++; 2427 } 2428 } 2429 if (new_jmeths != 0) { 2430 Method::ensure_jmethod_ids(class_loader_data(), new_jmeths); 2431 } 2432 } 2433 2434 // Common code to fetch the jmethodID from the cache or update the 2435 // cache with the new jmethodID. This function should never do anything 2436 // that causes the caller to go to a safepoint or we can deadlock with 2437 // the VMThread or have cache consistency issues. 2438 // 2439 jmethodID InstanceKlass::get_jmethod_id_fetch_or_update( 2440 size_t idnum, jmethodID new_id, 2441 jmethodID* new_jmeths, jmethodID* to_dealloc_id_p, 2442 jmethodID** to_dealloc_jmeths_p) { 2443 assert(new_id != NULL, "sanity check"); 2444 assert(to_dealloc_id_p != NULL, "sanity check"); 2445 assert(to_dealloc_jmeths_p != NULL, "sanity check"); 2446 assert(JmethodIdCreation_lock->owned_by_self(), "sanity check"); 2447 2448 // reacquire the cache - we are locked, single threaded or at a safepoint 2449 jmethodID* jmeths = methods_jmethod_ids_acquire(); 2450 jmethodID id = NULL; 2451 size_t length = 0; 2452 2453 if (jmeths == NULL || // no cache yet 2454 (length = (size_t)jmeths[0]) <= idnum) { // cache is too short 2455 if (jmeths != NULL) { 2456 // copy any existing entries from the old cache 2457 for (size_t index = 0; index < length; index++) { 2458 new_jmeths[index+1] = jmeths[index+1]; 2459 } 2460 *to_dealloc_jmeths_p = jmeths; // save old cache for later delete 2461 } 2462 release_set_methods_jmethod_ids(jmeths = new_jmeths); 2463 } else { 2464 // fetch jmethodID (if any) from the existing cache 2465 id = jmeths[idnum+1]; 2466 *to_dealloc_jmeths_p = new_jmeths; // save new cache for later delete 2467 } 2468 if (id == NULL) { 2469 // No matching jmethodID in the existing cache or we have a new 2470 // cache or we just grew the cache. This cache write is done here 2471 // by the first thread to win the foot race because a jmethodID 2472 // needs to be unique once it is generally available. 2473 id = new_id; 2474 2475 // The jmethodID cache can be read while unlocked so we have to 2476 // make sure the new jmethodID is complete before installing it 2477 // in the cache. 2478 Atomic::release_store(&jmeths[idnum+1], id); 2479 } else { 2480 *to_dealloc_id_p = new_id; // save new id for later delete 2481 } 2482 return id; 2483 } 2484 2485 2486 // Common code to get the jmethodID cache length and the jmethodID 2487 // value at index idnum if there is one. 2488 // 2489 void InstanceKlass::get_jmethod_id_length_value(jmethodID* cache, 2490 size_t idnum, size_t *length_p, jmethodID* id_p) { 2491 assert(cache != NULL, "sanity check"); 2492 assert(length_p != NULL, "sanity check"); 2493 assert(id_p != NULL, "sanity check"); 2494 2495 // cache size is stored in element[0], other elements offset by one 2496 *length_p = (size_t)cache[0]; 2497 if (*length_p <= idnum) { // cache is too short 2498 *id_p = NULL; 2499 } else { 2500 *id_p = cache[idnum+1]; // fetch jmethodID (if any) 2501 } 2502 } 2503 2504 2505 // Lookup a jmethodID, NULL if not found. Do no blocking, no allocations, no handles 2506 jmethodID InstanceKlass::jmethod_id_or_null(Method* method) { 2507 size_t idnum = (size_t)method->method_idnum(); 2508 jmethodID* jmeths = methods_jmethod_ids_acquire(); 2509 size_t length; // length assigned as debugging crumb 2510 jmethodID id = NULL; 2511 if (jmeths != NULL && // If there is a cache 2512 (length = (size_t)jmeths[0]) > idnum) { // and if it is long enough, 2513 id = jmeths[idnum+1]; // Look up the id (may be NULL) 2514 } 2515 return id; 2516 } 2517 2518 inline DependencyContext InstanceKlass::dependencies() { 2519 DependencyContext dep_context(&_dep_context, &_dep_context_last_cleaned); 2520 return dep_context; 2521 } 2522 2523 int InstanceKlass::mark_dependent_nmethods(KlassDepChange& changes) { 2524 return dependencies().mark_dependent_nmethods(changes); 2525 } 2526 2527 void InstanceKlass::add_dependent_nmethod(nmethod* nm) { 2528 dependencies().add_dependent_nmethod(nm); 2529 } 2530 2531 void InstanceKlass::clean_dependency_context() { 2532 dependencies().clean_unloading_dependents(); 2533 } 2534 2535 #ifndef PRODUCT 2536 void InstanceKlass::print_dependent_nmethods(bool verbose) { 2537 dependencies().print_dependent_nmethods(verbose); 2538 } 2539 2540 bool InstanceKlass::is_dependent_nmethod(nmethod* nm) { 2541 return dependencies().is_dependent_nmethod(nm); 2542 } 2543 #endif //PRODUCT 2544 2545 void InstanceKlass::clean_weak_instanceklass_links() { 2546 clean_implementors_list(); 2547 clean_method_data(); 2548 } 2549 2550 void InstanceKlass::clean_implementors_list() { 2551 assert(is_loader_alive(), "this klass should be live"); 2552 if (is_interface()) { 2553 assert (ClassUnloading, "only called for ClassUnloading"); 2554 for (;;) { 2555 // Use load_acquire due to competing with inserts 2556 InstanceKlass* impl = Atomic::load_acquire(adr_implementor()); 2557 if (impl != NULL && !impl->is_loader_alive()) { 2558 // NULL this field, might be an unloaded instance klass or NULL 2559 InstanceKlass* volatile* iklass = adr_implementor(); 2560 if (Atomic::cmpxchg(iklass, impl, (InstanceKlass*)NULL) == impl) { 2561 // Successfully unlinking implementor. 2562 if (log_is_enabled(Trace, class, unload)) { 2563 ResourceMark rm; 2564 log_trace(class, unload)("unlinking class (implementor): %s", impl->external_name()); 2565 } 2566 return; 2567 } 2568 } else { 2569 return; 2570 } 2571 } 2572 } 2573 } 2574 2575 void InstanceKlass::clean_method_data() { 2576 for (int m = 0; m < methods()->length(); m++) { 2577 MethodData* mdo = methods()->at(m)->method_data(); 2578 if (mdo != NULL) { 2579 MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : mdo->extra_data_lock()); 2580 mdo->clean_method_data(/*always_clean*/false); 2581 } 2582 } 2583 } 2584 2585 void InstanceKlass::metaspace_pointers_do(MetaspaceClosure* it) { 2586 Klass::metaspace_pointers_do(it); 2587 2588 if (log_is_enabled(Trace, cds)) { 2589 ResourceMark rm; 2590 log_trace(cds)("Iter(InstanceKlass): %p (%s)", this, external_name()); 2591 } 2592 2593 it->push(&_annotations); 2594 it->push((Klass**)&_array_klasses); 2595 if (!is_rewritten()) { 2596 it->push(&_constants, MetaspaceClosure::_writable); 2597 } else { 2598 it->push(&_constants); 2599 } 2600 it->push(&_inner_classes); 2601 #if INCLUDE_JVMTI 2602 it->push(&_previous_versions); 2603 #endif 2604 it->push(&_methods); 2605 it->push(&_default_methods); 2606 it->push(&_local_interfaces); 2607 it->push(&_transitive_interfaces); 2608 it->push(&_method_ordering); 2609 if (!is_rewritten()) { 2610 it->push(&_default_vtable_indices, MetaspaceClosure::_writable); 2611 } else { 2612 it->push(&_default_vtable_indices); 2613 } 2614 2615 // _fields might be written into by Rewriter::scan_method() -> fd.set_has_initialized_final_update() 2616 it->push(&_fields, MetaspaceClosure::_writable); 2617 2618 if (itable_length() > 0) { 2619 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable(); 2620 int method_table_offset_in_words = ioe->offset()/wordSize; 2621 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words()) 2622 / itableOffsetEntry::size(); 2623 2624 for (int i = 0; i < nof_interfaces; i ++, ioe ++) { 2625 if (ioe->interface_klass() != NULL) { 2626 it->push(ioe->interface_klass_addr()); 2627 itableMethodEntry* ime = ioe->first_method_entry(this); 2628 int n = klassItable::method_count_for_interface(ioe->interface_klass()); 2629 for (int index = 0; index < n; index ++) { 2630 it->push(ime[index].method_addr()); 2631 } 2632 } 2633 } 2634 } 2635 2636 it->push(&_nest_members); 2637 it->push(&_permitted_subclasses); 2638 it->push(&_preload_classes); 2639 it->push(&_record_components); 2640 2641 if (has_inline_type_fields()) { 2642 for (int i = 0; i < java_fields_count(); i++) { 2643 it->push(&((Klass**)adr_inline_type_field_klasses())[i]); 2644 } 2645 } 2646 } 2647 2648 #if INCLUDE_CDS 2649 void InstanceKlass::remove_unshareable_info() { 2650 2651 if (is_linked()) { 2652 assert(can_be_verified_at_dumptime(), "must be"); 2653 // Remember this so we can avoid walking the hierarchy at runtime. 2654 set_verified_at_dump_time(); 2655 } 2656 2657 Klass::remove_unshareable_info(); 2658 2659 if (SystemDictionaryShared::has_class_failed_verification(this)) { 2660 // Classes are attempted to link during dumping and may fail, 2661 // but these classes are still in the dictionary and class list in CLD. 2662 // If the class has failed verification, there is nothing else to remove. 2663 return; 2664 } 2665 2666 // Reset to the 'allocated' state to prevent any premature accessing to 2667 // a shared class at runtime while the class is still being loaded and 2668 // restored. A class' init_state is set to 'loaded' at runtime when it's 2669 // being added to class hierarchy (see SystemDictionary:::add_to_hierarchy()). 2670 _init_state = allocated; 2671 2672 { // Otherwise this needs to take out the Compile_lock. 2673 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); 2674 init_implementor(); 2675 } 2676 2677 constants()->remove_unshareable_info(); 2678 2679 for (int i = 0; i < methods()->length(); i++) { 2680 Method* m = methods()->at(i); 2681 m->remove_unshareable_info(); 2682 } 2683 2684 // do array classes also. 2685 if (array_klasses() != NULL) { 2686 array_klasses()->remove_unshareable_info(); 2687 } 2688 2689 if (has_inline_type_fields()) { 2690 for (AllFieldStream fs(fields(), constants()); !fs.done(); fs.next()) { 2691 if (Signature::basic_type(fs.signature()) == T_PRIMITIVE_OBJECT) { 2692 reset_inline_type_field_klass(fs.index()); 2693 } 2694 } 2695 } 2696 2697 // These are not allocated from metaspace. They are safe to set to NULL. 2698 _source_debug_extension = NULL; 2699 _dep_context = NULL; 2700 _osr_nmethods_head = NULL; 2701 #if INCLUDE_JVMTI 2702 _breakpoints = NULL; 2703 _previous_versions = NULL; 2704 _cached_class_file = NULL; 2705 _jvmti_cached_class_field_map = NULL; 2706 #endif 2707 2708 _init_thread = NULL; 2709 _methods_jmethod_ids = NULL; 2710 _jni_ids = NULL; 2711 _oop_map_cache = NULL; 2712 // clear _nest_host to ensure re-load at runtime 2713 _nest_host = NULL; 2714 init_shared_package_entry(); 2715 _dep_context_last_cleaned = 0; 2716 _init_monitor = NULL; 2717 } 2718 2719 void InstanceKlass::remove_java_mirror() { 2720 Klass::remove_java_mirror(); 2721 2722 // do array classes also. 2723 if (array_klasses() != NULL) { 2724 array_klasses()->remove_java_mirror(); 2725 } 2726 } 2727 2728 void InstanceKlass::init_shared_package_entry() { 2729 #if !INCLUDE_CDS_JAVA_HEAP 2730 _package_entry = NULL; 2731 #else 2732 if (!MetaspaceShared::use_full_module_graph()) { 2733 _package_entry = NULL; 2734 } else if (DynamicDumpSharedSpaces) { 2735 if (!MetaspaceShared::is_in_shared_metaspace(_package_entry)) { 2736 _package_entry = NULL; 2737 } 2738 } else { 2739 if (is_shared_unregistered_class()) { 2740 _package_entry = NULL; 2741 } else { 2742 _package_entry = PackageEntry::get_archived_entry(_package_entry); 2743 } 2744 } 2745 ArchivePtrMarker::mark_pointer((address**)&_package_entry); 2746 #endif 2747 } 2748 2749 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, 2750 PackageEntry* pkg_entry, TRAPS) { 2751 // SystemDictionary::add_to_hierarchy() sets the init_state to loaded 2752 // before the InstanceKlass is added to the SystemDictionary. Make 2753 // sure the current state is <loaded. 2754 assert(!is_loaded(), "invalid init state"); 2755 assert(!shared_loading_failed(), "Must not try to load failed class again"); 2756 set_package(loader_data, pkg_entry, CHECK); 2757 Klass::restore_unshareable_info(loader_data, protection_domain, CHECK); 2758 2759 if (is_inline_klass()) { 2760 InlineKlass::cast(this)->initialize_calling_convention(CHECK); 2761 } 2762 2763 Array<Method*>* methods = this->methods(); 2764 int num_methods = methods->length(); 2765 for (int index = 0; index < num_methods; ++index) { 2766 methods->at(index)->restore_unshareable_info(CHECK); 2767 } 2768 #if INCLUDE_JVMTI 2769 if (JvmtiExport::has_redefined_a_class()) { 2770 // Reinitialize vtable because RedefineClasses may have changed some 2771 // entries in this vtable for super classes so the CDS vtable might 2772 // point to old or obsolete entries. RedefineClasses doesn't fix up 2773 // vtables in the shared system dictionary, only the main one. 2774 // It also redefines the itable too so fix that too. 2775 // First fix any default methods that point to a super class that may 2776 // have been redefined. 2777 bool trace_name_printed = false; 2778 adjust_default_methods(&trace_name_printed); 2779 vtable().initialize_vtable(); 2780 itable().initialize_itable(); 2781 } 2782 #endif 2783 2784 // restore constant pool resolved references 2785 constants()->restore_unshareable_info(CHECK); 2786 2787 if (array_klasses() != NULL) { 2788 // To get a consistent list of classes we need MultiArray_lock to ensure 2789 // array classes aren't observed while they are being restored. 2790 MutexLocker ml(MultiArray_lock); 2791 // Array classes have null protection domain. 2792 // --> see ArrayKlass::complete_create_array_klass() 2793 array_klasses()->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK); 2794 } 2795 2796 // Initialize @ValueBased class annotation 2797 if (DiagnoseSyncOnValueBasedClasses && has_value_based_class_annotation()) { 2798 set_is_value_based(); 2799 } 2800 2801 // restore the monitor 2802 _init_monitor = create_init_monitor("InstanceKlassInitMonitorRestored_lock"); 2803 } 2804 2805 // Check if a class or any of its supertypes has a version older than 50. 2806 // CDS will not perform verification of old classes during dump time because 2807 // without changing the old verifier, the verification constraint cannot be 2808 // retrieved during dump time. 2809 // Verification of archived old classes will be performed during run time. 2810 bool InstanceKlass::can_be_verified_at_dumptime() const { 2811 if (MetaspaceShared::is_in_shared_metaspace(this)) { 2812 // This is a class that was dumped into the base archive, so we know 2813 // it was verified at dump time. 2814 return true; 2815 } 2816 if (major_version() < 50 /*JAVA_6_VERSION*/) { 2817 return false; 2818 } 2819 if (java_super() != NULL && !java_super()->can_be_verified_at_dumptime()) { 2820 return false; 2821 } 2822 Array<InstanceKlass*>* interfaces = local_interfaces(); 2823 int len = interfaces->length(); 2824 for (int i = 0; i < len; i++) { 2825 if (!interfaces->at(i)->can_be_verified_at_dumptime()) { 2826 return false; 2827 } 2828 } 2829 return true; 2830 } 2831 #endif // INCLUDE_CDS 2832 2833 #if INCLUDE_JVMTI 2834 static void clear_all_breakpoints(Method* m) { 2835 m->clear_all_breakpoints(); 2836 } 2837 #endif 2838 2839 void InstanceKlass::unload_class(InstanceKlass* ik) { 2840 // Release dependencies. 2841 ik->dependencies().remove_all_dependents(); 2842 2843 // notify the debugger 2844 if (JvmtiExport::should_post_class_unload()) { 2845 JvmtiExport::post_class_unload(ik); 2846 } 2847 2848 // notify ClassLoadingService of class unload 2849 ClassLoadingService::notify_class_unloaded(ik); 2850 2851 SystemDictionaryShared::handle_class_unloading(ik); 2852 2853 if (log_is_enabled(Info, class, unload)) { 2854 ResourceMark rm; 2855 log_info(class, unload)("unloading class %s " PTR_FORMAT, ik->external_name(), p2i(ik)); 2856 } 2857 2858 Events::log_class_unloading(Thread::current(), ik); 2859 2860 #if INCLUDE_JFR 2861 assert(ik != NULL, "invariant"); 2862 EventClassUnload event; 2863 event.set_unloadedClass(ik); 2864 event.set_definingClassLoader(ik->class_loader_data()); 2865 event.commit(); 2866 #endif 2867 } 2868 2869 static void method_release_C_heap_structures(Method* m) { 2870 m->release_C_heap_structures(); 2871 } 2872 2873 // Called also by InstanceKlass::deallocate_contents, with false for release_sub_metadata. 2874 void InstanceKlass::release_C_heap_structures(bool release_sub_metadata) { 2875 // Clean up C heap 2876 Klass::release_C_heap_structures(); 2877 2878 // Deallocate and call destructors for MDO mutexes 2879 if (release_sub_metadata) { 2880 methods_do(method_release_C_heap_structures); 2881 } 2882 2883 // Destroy the init_monitor 2884 delete _init_monitor; 2885 2886 // Deallocate oop map cache 2887 if (_oop_map_cache != NULL) { 2888 delete _oop_map_cache; 2889 _oop_map_cache = NULL; 2890 } 2891 2892 // Deallocate JNI identifiers for jfieldIDs 2893 JNIid::deallocate(jni_ids()); 2894 set_jni_ids(NULL); 2895 2896 jmethodID* jmeths = methods_jmethod_ids_acquire(); 2897 if (jmeths != (jmethodID*)NULL) { 2898 release_set_methods_jmethod_ids(NULL); 2899 FreeHeap(jmeths); 2900 } 2901 2902 assert(_dep_context == NULL, 2903 "dependencies should already be cleaned"); 2904 2905 #if INCLUDE_JVMTI 2906 // Deallocate breakpoint records 2907 if (breakpoints() != 0x0) { 2908 methods_do(clear_all_breakpoints); 2909 assert(breakpoints() == 0x0, "should have cleared breakpoints"); 2910 } 2911 2912 // deallocate the cached class file 2913 if (_cached_class_file != NULL) { 2914 os::free(_cached_class_file); 2915 _cached_class_file = NULL; 2916 } 2917 #endif 2918 2919 FREE_C_HEAP_ARRAY(char, _source_debug_extension); 2920 2921 if (release_sub_metadata) { 2922 constants()->release_C_heap_structures(); 2923 } 2924 } 2925 2926 void InstanceKlass::set_source_debug_extension(const char* array, int length) { 2927 if (array == NULL) { 2928 _source_debug_extension = NULL; 2929 } else { 2930 // Adding one to the attribute length in order to store a null terminator 2931 // character could cause an overflow because the attribute length is 2932 // already coded with an u4 in the classfile, but in practice, it's 2933 // unlikely to happen. 2934 assert((length+1) > length, "Overflow checking"); 2935 char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass); 2936 for (int i = 0; i < length; i++) { 2937 sde[i] = array[i]; 2938 } 2939 sde[length] = '\0'; 2940 _source_debug_extension = sde; 2941 } 2942 } 2943 2944 const char* InstanceKlass::signature_name() const { 2945 return signature_name_of_carrier(JVM_SIGNATURE_CLASS); 2946 } 2947 2948 const char* InstanceKlass::signature_name_of_carrier(char c) const { 2949 // Get the internal name as a c string 2950 const char* src = (const char*) (name()->as_C_string()); 2951 const int src_length = (int)strlen(src); 2952 2953 char* dest = NEW_RESOURCE_ARRAY(char, src_length + 3); 2954 2955 // Add L or Q as type indicator 2956 int dest_index = 0; 2957 dest[dest_index++] = c; 2958 2959 // Add the actual class name 2960 for (int src_index = 0; src_index < src_length; ) { 2961 dest[dest_index++] = src[src_index++]; 2962 } 2963 2964 if (is_hidden()) { // Replace the last '+' with a '.'. 2965 for (int index = (int)src_length; index > 0; index--) { 2966 if (dest[index] == '+') { 2967 dest[index] = JVM_SIGNATURE_DOT; 2968 break; 2969 } 2970 } 2971 } 2972 2973 // Add the semicolon and the NULL 2974 dest[dest_index++] = JVM_SIGNATURE_ENDCLASS; 2975 dest[dest_index] = '\0'; 2976 return dest; 2977 } 2978 2979 ModuleEntry* InstanceKlass::module() const { 2980 if (is_hidden() && 2981 in_unnamed_package() && 2982 class_loader_data()->has_class_mirror_holder()) { 2983 // For a non-strong hidden class defined to an unnamed package, 2984 // its (class held) CLD will not have an unnamed module created for it. 2985 // Two choices to find the correct ModuleEntry: 2986 // 1. If hidden class is within a nest, use nest host's module 2987 // 2. Find the unnamed module off from the class loader 2988 // For now option #2 is used since a nest host is not set until 2989 // after the instance class is created in jvm_lookup_define_class(). 2990 if (class_loader_data()->is_boot_class_loader_data()) { 2991 return ClassLoaderData::the_null_class_loader_data()->unnamed_module(); 2992 } else { 2993 oop module = java_lang_ClassLoader::unnamedModule(class_loader_data()->class_loader()); 2994 assert(java_lang_Module::is_instance(module), "Not an instance of java.lang.Module"); 2995 return java_lang_Module::module_entry(module); 2996 } 2997 } 2998 2999 // Class is in a named package 3000 if (!in_unnamed_package()) { 3001 return _package_entry->module(); 3002 } 3003 3004 // Class is in an unnamed package, return its loader's unnamed module 3005 return class_loader_data()->unnamed_module(); 3006 } 3007 3008 void InstanceKlass::set_package(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS) { 3009 3010 // ensure java/ packages only loaded by boot or platform builtin loaders 3011 // not needed for shared class since CDS does not archive prohibited classes. 3012 if (!is_shared()) { 3013 check_prohibited_package(name(), loader_data, CHECK); 3014 } 3015 3016 if (is_shared() && _package_entry != NULL) { 3017 if (MetaspaceShared::use_full_module_graph() && _package_entry == pkg_entry) { 3018 // we can use the saved package 3019 assert(MetaspaceShared::is_in_shared_metaspace(_package_entry), "must be"); 3020 return; 3021 } else { 3022 _package_entry = NULL; 3023 } 3024 } 3025 3026 // ClassLoader::package_from_class_name has already incremented the refcount of the symbol 3027 // it returns, so we need to decrement it when the current function exits. 3028 TempNewSymbol from_class_name = 3029 (pkg_entry != NULL) ? NULL : ClassLoader::package_from_class_name(name()); 3030 3031 Symbol* pkg_name; 3032 if (pkg_entry != NULL) { 3033 pkg_name = pkg_entry->name(); 3034 } else { 3035 pkg_name = from_class_name; 3036 } 3037 3038 if (pkg_name != NULL && loader_data != NULL) { 3039 3040 // Find in class loader's package entry table. 3041 _package_entry = pkg_entry != NULL ? pkg_entry : loader_data->packages()->lookup_only(pkg_name); 3042 3043 // If the package name is not found in the loader's package 3044 // entry table, it is an indication that the package has not 3045 // been defined. Consider it defined within the unnamed module. 3046 if (_package_entry == NULL) { 3047 3048 if (!ModuleEntryTable::javabase_defined()) { 3049 // Before java.base is defined during bootstrapping, define all packages in 3050 // the java.base module. If a non-java.base package is erroneously placed 3051 // in the java.base module it will be caught later when java.base 3052 // is defined by ModuleEntryTable::verify_javabase_packages check. 3053 assert(ModuleEntryTable::javabase_moduleEntry() != NULL, JAVA_BASE_NAME " module is NULL"); 3054 _package_entry = loader_data->packages()->create_entry_if_absent(pkg_name, ModuleEntryTable::javabase_moduleEntry()); 3055 } else { 3056 assert(loader_data->unnamed_module() != NULL, "unnamed module is NULL"); 3057 _package_entry = loader_data->packages()->create_entry_if_absent(pkg_name, loader_data->unnamed_module()); 3058 } 3059 3060 // A package should have been successfully created 3061 DEBUG_ONLY(ResourceMark rm(THREAD)); 3062 assert(_package_entry != NULL, "Package entry for class %s not found, loader %s", 3063 name()->as_C_string(), loader_data->loader_name_and_id()); 3064 } 3065 3066 if (log_is_enabled(Debug, module)) { 3067 ResourceMark rm(THREAD); 3068 ModuleEntry* m = _package_entry->module(); 3069 log_trace(module)("Setting package: class: %s, package: %s, loader: %s, module: %s", 3070 external_name(), 3071 pkg_name->as_C_string(), 3072 loader_data->loader_name_and_id(), 3073 (m->is_named() ? m->name()->as_C_string() : UNNAMED_MODULE)); 3074 } 3075 } else { 3076 ResourceMark rm(THREAD); 3077 log_trace(module)("Setting package: class: %s, package: unnamed, loader: %s, module: %s", 3078 external_name(), 3079 (loader_data != NULL) ? loader_data->loader_name_and_id() : "NULL", 3080 UNNAMED_MODULE); 3081 } 3082 } 3083 3084 // Function set_classpath_index ensures that for a non-null _package_entry 3085 // of the InstanceKlass, the entry is in the boot loader's package entry table. 3086 // It then sets the classpath_index in the package entry record. 3087 // 3088 // The classpath_index field is used to find the entry on the boot loader class 3089 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a 3090 // in an unnamed module. It is also used to indicate (for all packages whose 3091 // classes are loaded by the boot loader) that at least one of the package's 3092 // classes has been loaded. 3093 void InstanceKlass::set_classpath_index(s2 path_index) { 3094 if (_package_entry != NULL) { 3095 DEBUG_ONLY(PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();) 3096 assert(pkg_entry_tbl->lookup_only(_package_entry->name()) == _package_entry, "Should be same"); 3097 assert(path_index != -1, "Unexpected classpath_index"); 3098 _package_entry->set_classpath_index(path_index); 3099 } 3100 } 3101 3102 // different versions of is_same_class_package 3103 3104 bool InstanceKlass::is_same_class_package(const Klass* class2) const { 3105 oop classloader1 = this->class_loader(); 3106 PackageEntry* classpkg1 = this->package(); 3107 if (class2->is_objArray_klass()) { 3108 class2 = ObjArrayKlass::cast(class2)->bottom_klass(); 3109 } 3110 3111 oop classloader2; 3112 PackageEntry* classpkg2; 3113 if (class2->is_instance_klass()) { 3114 classloader2 = class2->class_loader(); 3115 classpkg2 = class2->package(); 3116 } else { 3117 assert(class2->is_typeArray_klass(), "should be type array"); 3118 classloader2 = NULL; 3119 classpkg2 = NULL; 3120 } 3121 3122 // Same package is determined by comparing class loader 3123 // and package entries. Both must be the same. This rule 3124 // applies even to classes that are defined in the unnamed 3125 // package, they still must have the same class loader. 3126 if ((classloader1 == classloader2) && (classpkg1 == classpkg2)) { 3127 return true; 3128 } 3129 3130 return false; 3131 } 3132 3133 // return true if this class and other_class are in the same package. Classloader 3134 // and classname information is enough to determine a class's package 3135 bool InstanceKlass::is_same_class_package(oop other_class_loader, 3136 const Symbol* other_class_name) const { 3137 if (class_loader() != other_class_loader) { 3138 return false; 3139 } 3140 if (name()->fast_compare(other_class_name) == 0) { 3141 return true; 3142 } 3143 3144 { 3145 ResourceMark rm; 3146 3147 bool bad_class_name = false; 3148 TempNewSymbol other_pkg = ClassLoader::package_from_class_name(other_class_name, &bad_class_name); 3149 if (bad_class_name) { 3150 return false; 3151 } 3152 // Check that package_from_class_name() returns NULL, not "", if there is no package. 3153 assert(other_pkg == NULL || other_pkg->utf8_length() > 0, "package name is empty string"); 3154 3155 const Symbol* const this_package_name = 3156 this->package() != NULL ? this->package()->name() : NULL; 3157 3158 if (this_package_name == NULL || other_pkg == NULL) { 3159 // One of the two doesn't have a package. Only return true if the other 3160 // one also doesn't have a package. 3161 return this_package_name == other_pkg; 3162 } 3163 3164 // Check if package is identical 3165 return this_package_name->fast_compare(other_pkg) == 0; 3166 } 3167 } 3168 3169 static bool is_prohibited_package_slow(Symbol* class_name) { 3170 // Caller has ResourceMark 3171 int length; 3172 jchar* unicode = class_name->as_unicode(length); 3173 return (length >= 5 && 3174 unicode[0] == 'j' && 3175 unicode[1] == 'a' && 3176 unicode[2] == 'v' && 3177 unicode[3] == 'a' && 3178 unicode[4] == '/'); 3179 } 3180 3181 // Only boot and platform class loaders can define classes in "java/" packages. 3182 void InstanceKlass::check_prohibited_package(Symbol* class_name, 3183 ClassLoaderData* loader_data, 3184 TRAPS) { 3185 if (!loader_data->is_boot_class_loader_data() && 3186 !loader_data->is_platform_class_loader_data() && 3187 class_name != NULL && class_name->utf8_length() >= 5) { 3188 ResourceMark rm(THREAD); 3189 bool prohibited; 3190 const u1* base = class_name->base(); 3191 if ((base[0] | base[1] | base[2] | base[3] | base[4]) & 0x80) { 3192 prohibited = is_prohibited_package_slow(class_name); 3193 } else { 3194 char* name = class_name->as_C_string(); 3195 prohibited = (strncmp(name, JAVAPKG, JAVAPKG_LEN) == 0 && name[JAVAPKG_LEN] == '/'); 3196 } 3197 if (prohibited) { 3198 TempNewSymbol pkg_name = ClassLoader::package_from_class_name(class_name); 3199 assert(pkg_name != NULL, "Error in parsing package name starting with 'java/'"); 3200 char* name = pkg_name->as_C_string(); 3201 const char* class_loader_name = loader_data->loader_name_and_id(); 3202 StringUtils::replace_no_expand(name, "/", "."); 3203 const char* msg_text1 = "Class loader (instance of): "; 3204 const char* msg_text2 = " tried to load prohibited package name: "; 3205 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + strlen(name) + 1; 3206 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len); 3207 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, name); 3208 THROW_MSG(vmSymbols::java_lang_SecurityException(), message); 3209 } 3210 } 3211 return; 3212 } 3213 3214 bool InstanceKlass::find_inner_classes_attr(int* ooff, int* noff, TRAPS) const { 3215 constantPoolHandle i_cp(THREAD, constants()); 3216 for (InnerClassesIterator iter(this); !iter.done(); iter.next()) { 3217 int ioff = iter.inner_class_info_index(); 3218 if (ioff != 0) { 3219 // Check to see if the name matches the class we're looking for 3220 // before attempting to find the class. 3221 if (i_cp->klass_name_at_matches(this, ioff)) { 3222 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_false); 3223 if (this == inner_klass) { 3224 *ooff = iter.outer_class_info_index(); 3225 *noff = iter.inner_name_index(); 3226 return true; 3227 } 3228 } 3229 } 3230 } 3231 return false; 3232 } 3233 3234 InstanceKlass* InstanceKlass::compute_enclosing_class(bool* inner_is_member, TRAPS) const { 3235 InstanceKlass* outer_klass = NULL; 3236 *inner_is_member = false; 3237 int ooff = 0, noff = 0; 3238 bool has_inner_classes_attr = find_inner_classes_attr(&ooff, &noff, THREAD); 3239 if (has_inner_classes_attr) { 3240 constantPoolHandle i_cp(THREAD, constants()); 3241 if (ooff != 0) { 3242 Klass* ok = i_cp->klass_at(ooff, CHECK_NULL); 3243 if (!ok->is_instance_klass()) { 3244 // If the outer class is not an instance klass then it cannot have 3245 // declared any inner classes. 3246 ResourceMark rm(THREAD); 3247 Exceptions::fthrow( 3248 THREAD_AND_LOCATION, 3249 vmSymbols::java_lang_IncompatibleClassChangeError(), 3250 "%s and %s disagree on InnerClasses attribute", 3251 ok->external_name(), 3252 external_name()); 3253 return NULL; 3254 } 3255 outer_klass = InstanceKlass::cast(ok); 3256 *inner_is_member = true; 3257 } 3258 if (NULL == outer_klass) { 3259 // It may be a local class; try for that. 3260 int encl_method_class_idx = enclosing_method_class_index(); 3261 if (encl_method_class_idx != 0) { 3262 Klass* ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL); 3263 outer_klass = InstanceKlass::cast(ok); 3264 *inner_is_member = false; 3265 } 3266 } 3267 } 3268 3269 // If no inner class attribute found for this class. 3270 if (NULL == outer_klass) return NULL; 3271 3272 // Throws an exception if outer klass has not declared k as an inner klass 3273 // We need evidence that each klass knows about the other, or else 3274 // the system could allow a spoof of an inner class to gain access rights. 3275 Reflection::check_for_inner_class(outer_klass, this, *inner_is_member, CHECK_NULL); 3276 return outer_klass; 3277 } 3278 3279 jint InstanceKlass::compute_modifier_flags() const { 3280 jint access = access_flags().as_int(); 3281 3282 // But check if it happens to be member class. 3283 InnerClassesIterator iter(this); 3284 for (; !iter.done(); iter.next()) { 3285 int ioff = iter.inner_class_info_index(); 3286 // Inner class attribute can be zero, skip it. 3287 // Strange but true: JVM spec. allows null inner class refs. 3288 if (ioff == 0) continue; 3289 3290 // only look at classes that are already loaded 3291 // since we are looking for the flags for our self. 3292 Symbol* inner_name = constants()->klass_name_at(ioff); 3293 if (name() == inner_name) { 3294 // This is really a member class. 3295 access = iter.inner_access_flags(); 3296 break; 3297 } 3298 } 3299 return (access & JVM_ACC_WRITTEN_FLAGS); 3300 } 3301 3302 jint InstanceKlass::jvmti_class_status() const { 3303 jint result = 0; 3304 3305 if (is_linked()) { 3306 result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED; 3307 } 3308 3309 if (is_initialized()) { 3310 assert(is_linked(), "Class status is not consistent"); 3311 result |= JVMTI_CLASS_STATUS_INITIALIZED; 3312 } 3313 if (is_in_error_state()) { 3314 result |= JVMTI_CLASS_STATUS_ERROR; 3315 } 3316 return result; 3317 } 3318 3319 Method* InstanceKlass::method_at_itable(InstanceKlass* holder, int index, TRAPS) { 3320 bool implements_interface; // initialized by method_at_itable_or_null 3321 Method* m = method_at_itable_or_null(holder, index, 3322 implements_interface); // out parameter 3323 if (m != NULL) { 3324 assert(implements_interface, "sanity"); 3325 return m; 3326 } else if (implements_interface) { 3327 // Throw AbstractMethodError since corresponding itable slot is empty. 3328 THROW_NULL(vmSymbols::java_lang_AbstractMethodError()); 3329 } else { 3330 // If the interface isn't implemented by the receiver class, 3331 // the VM should throw IncompatibleClassChangeError. 3332 ResourceMark rm(THREAD); 3333 stringStream ss; 3334 bool same_module = (module() == holder->module()); 3335 ss.print("Receiver class %s does not implement " 3336 "the interface %s defining the method to be called " 3337 "(%s%s%s)", 3338 external_name(), holder->external_name(), 3339 (same_module) ? joint_in_module_of_loader(holder) : class_in_module_of_loader(), 3340 (same_module) ? "" : "; ", 3341 (same_module) ? "" : holder->class_in_module_of_loader()); 3342 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string()); 3343 } 3344 } 3345 3346 Method* InstanceKlass::method_at_itable_or_null(InstanceKlass* holder, int index, bool& implements_interface) { 3347 klassItable itable(this); 3348 for (int i = 0; i < itable.size_offset_table(); i++) { 3349 itableOffsetEntry* offset_entry = itable.offset_entry(i); 3350 if (offset_entry->interface_klass() == holder) { 3351 implements_interface = true; 3352 itableMethodEntry* ime = offset_entry->first_method_entry(this); 3353 Method* m = ime[index].method(); 3354 return m; 3355 } 3356 } 3357 implements_interface = false; 3358 return NULL; // offset entry not found 3359 } 3360 3361 int InstanceKlass::vtable_index_of_interface_method(Method* intf_method) { 3362 assert(is_linked(), "required"); 3363 assert(intf_method->method_holder()->is_interface(), "not an interface method"); 3364 assert(is_subtype_of(intf_method->method_holder()), "interface not implemented"); 3365 3366 int vtable_index = Method::invalid_vtable_index; 3367 Symbol* name = intf_method->name(); 3368 Symbol* signature = intf_method->signature(); 3369 3370 // First check in default method array 3371 if (!intf_method->is_abstract() && default_methods() != NULL) { 3372 int index = find_method_index(default_methods(), 3373 name, signature, 3374 Klass::OverpassLookupMode::find, 3375 Klass::StaticLookupMode::find, 3376 Klass::PrivateLookupMode::find); 3377 if (index >= 0) { 3378 vtable_index = default_vtable_indices()->at(index); 3379 } 3380 } 3381 if (vtable_index == Method::invalid_vtable_index) { 3382 // get vtable_index for miranda methods 3383 klassVtable vt = vtable(); 3384 vtable_index = vt.index_of_miranda(name, signature); 3385 } 3386 return vtable_index; 3387 } 3388 3389 #if INCLUDE_JVMTI 3390 // update default_methods for redefineclasses for methods that are 3391 // not yet in the vtable due to concurrent subclass define and superinterface 3392 // redefinition 3393 // Note: those in the vtable, should have been updated via adjust_method_entries 3394 void InstanceKlass::adjust_default_methods(bool* trace_name_printed) { 3395 // search the default_methods for uses of either obsolete or EMCP methods 3396 if (default_methods() != NULL) { 3397 for (int index = 0; index < default_methods()->length(); index ++) { 3398 Method* old_method = default_methods()->at(index); 3399 if (old_method == NULL || !old_method->is_old()) { 3400 continue; // skip uninteresting entries 3401 } 3402 assert(!old_method->is_deleted(), "default methods may not be deleted"); 3403 Method* new_method = old_method->get_new_method(); 3404 default_methods()->at_put(index, new_method); 3405 3406 if (log_is_enabled(Info, redefine, class, update)) { 3407 ResourceMark rm; 3408 if (!(*trace_name_printed)) { 3409 log_info(redefine, class, update) 3410 ("adjust: klassname=%s default methods from name=%s", 3411 external_name(), old_method->method_holder()->external_name()); 3412 *trace_name_printed = true; 3413 } 3414 log_debug(redefine, class, update, vtables) 3415 ("default method update: %s(%s) ", 3416 new_method->name()->as_C_string(), new_method->signature()->as_C_string()); 3417 } 3418 } 3419 } 3420 } 3421 #endif // INCLUDE_JVMTI 3422 3423 // On-stack replacement stuff 3424 void InstanceKlass::add_osr_nmethod(nmethod* n) { 3425 assert_lock_strong(CompiledMethod_lock); 3426 #ifndef PRODUCT 3427 nmethod* prev = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), n->comp_level(), true); 3428 assert(prev == NULL || !prev->is_in_use() COMPILER2_PRESENT(|| StressRecompilation), 3429 "redundant OSR recompilation detected. memory leak in CodeCache!"); 3430 #endif 3431 // only one compilation can be active 3432 assert(n->is_osr_method(), "wrong kind of nmethod"); 3433 n->set_osr_link(osr_nmethods_head()); 3434 set_osr_nmethods_head(n); 3435 // Raise the highest osr level if necessary 3436 n->method()->set_highest_osr_comp_level(MAX2(n->method()->highest_osr_comp_level(), n->comp_level())); 3437 3438 // Get rid of the osr methods for the same bci that have lower levels. 3439 for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) { 3440 nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true); 3441 if (inv != NULL && inv->is_in_use()) { 3442 inv->make_not_entrant(); 3443 } 3444 } 3445 } 3446 3447 // Remove osr nmethod from the list. Return true if found and removed. 3448 bool InstanceKlass::remove_osr_nmethod(nmethod* n) { 3449 // This is a short non-blocking critical region, so the no safepoint check is ok. 3450 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock 3451 , Mutex::_no_safepoint_check_flag); 3452 assert(n->is_osr_method(), "wrong kind of nmethod"); 3453 nmethod* last = NULL; 3454 nmethod* cur = osr_nmethods_head(); 3455 int max_level = CompLevel_none; // Find the max comp level excluding n 3456 Method* m = n->method(); 3457 // Search for match 3458 bool found = false; 3459 while(cur != NULL && cur != n) { 3460 if (m == cur->method()) { 3461 // Find max level before n 3462 max_level = MAX2(max_level, cur->comp_level()); 3463 } 3464 last = cur; 3465 cur = cur->osr_link(); 3466 } 3467 nmethod* next = NULL; 3468 if (cur == n) { 3469 found = true; 3470 next = cur->osr_link(); 3471 if (last == NULL) { 3472 // Remove first element 3473 set_osr_nmethods_head(next); 3474 } else { 3475 last->set_osr_link(next); 3476 } 3477 } 3478 n->set_osr_link(NULL); 3479 cur = next; 3480 while (cur != NULL) { 3481 // Find max level after n 3482 if (m == cur->method()) { 3483 max_level = MAX2(max_level, cur->comp_level()); 3484 } 3485 cur = cur->osr_link(); 3486 } 3487 m->set_highest_osr_comp_level(max_level); 3488 return found; 3489 } 3490 3491 int InstanceKlass::mark_osr_nmethods(const Method* m) { 3492 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, 3493 Mutex::_no_safepoint_check_flag); 3494 nmethod* osr = osr_nmethods_head(); 3495 int found = 0; 3496 while (osr != NULL) { 3497 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain"); 3498 if (osr->method() == m) { 3499 osr->mark_for_deoptimization(); 3500 found++; 3501 } 3502 osr = osr->osr_link(); 3503 } 3504 return found; 3505 } 3506 3507 nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const { 3508 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, 3509 Mutex::_no_safepoint_check_flag); 3510 nmethod* osr = osr_nmethods_head(); 3511 nmethod* best = NULL; 3512 while (osr != NULL) { 3513 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain"); 3514 // There can be a time when a c1 osr method exists but we are waiting 3515 // for a c2 version. When c2 completes its osr nmethod we will trash 3516 // the c1 version and only be able to find the c2 version. However 3517 // while we overflow in the c1 code at back branches we don't want to 3518 // try and switch to the same code as we are already running 3519 3520 if (osr->method() == m && 3521 (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) { 3522 if (match_level) { 3523 if (osr->comp_level() == comp_level) { 3524 // Found a match - return it. 3525 return osr; 3526 } 3527 } else { 3528 if (best == NULL || (osr->comp_level() > best->comp_level())) { 3529 if (osr->comp_level() == CompilationPolicy::highest_compile_level()) { 3530 // Found the best possible - return it. 3531 return osr; 3532 } 3533 best = osr; 3534 } 3535 } 3536 } 3537 osr = osr->osr_link(); 3538 } 3539 3540 assert(match_level == false || best == NULL, "shouldn't pick up anything if match_level is set"); 3541 if (best != NULL && best->comp_level() >= comp_level) { 3542 return best; 3543 } 3544 return NULL; 3545 } 3546 3547 // ----------------------------------------------------------------------------------------------------- 3548 // Printing 3549 3550 #define BULLET " - " 3551 3552 static const char* state_names[] = { 3553 "allocated", "loaded", "being_linked", "linked", "being_initialized", "fully_initialized", "initialization_error" 3554 }; 3555 3556 static void print_vtable(address self, intptr_t* start, int len, outputStream* st) { 3557 ResourceMark rm; 3558 int* forward_refs = NEW_RESOURCE_ARRAY(int, len); 3559 for (int i = 0; i < len; i++) forward_refs[i] = 0; 3560 for (int i = 0; i < len; i++) { 3561 intptr_t e = start[i]; 3562 st->print("%d : " INTPTR_FORMAT, i, e); 3563 if (forward_refs[i] != 0) { 3564 int from = forward_refs[i]; 3565 int off = (int) start[from]; 3566 st->print(" (offset %d <= [%d])", off, from); 3567 } 3568 if (MetaspaceObj::is_valid((Metadata*)e)) { 3569 st->print(" "); 3570 ((Metadata*)e)->print_value_on(st); 3571 } else if (self != NULL && e > 0 && e < 0x10000) { 3572 address location = self + e; 3573 int index = (int)((intptr_t*)location - start); 3574 st->print(" (offset %d => [%d])", (int)e, index); 3575 if (index >= 0 && index < len) 3576 forward_refs[index] = i; 3577 } 3578 st->cr(); 3579 } 3580 } 3581 3582 static void print_vtable(vtableEntry* start, int len, outputStream* st) { 3583 return print_vtable(NULL, reinterpret_cast<intptr_t*>(start), len, st); 3584 } 3585 3586 template<typename T> 3587 static void print_array_on(outputStream* st, Array<T>* array) { 3588 if (array == NULL) { st->print_cr("NULL"); return; } 3589 array->print_value_on(st); st->cr(); 3590 if (Verbose || WizardMode) { 3591 for (int i = 0; i < array->length(); i++) { 3592 st->print("%d : ", i); array->at(i)->print_value_on(st); st->cr(); 3593 } 3594 } 3595 } 3596 3597 static void print_array_on(outputStream* st, Array<int>* array) { 3598 if (array == NULL) { st->print_cr("NULL"); return; } 3599 array->print_value_on(st); st->cr(); 3600 if (Verbose || WizardMode) { 3601 for (int i = 0; i < array->length(); i++) { 3602 st->print("%d : %d", i, array->at(i)); st->cr(); 3603 } 3604 } 3605 } 3606 3607 const char* InstanceKlass::init_state_name() const { 3608 return state_names[_init_state]; 3609 } 3610 3611 void InstanceKlass::print_on(outputStream* st) const { 3612 assert(is_klass(), "must be klass"); 3613 Klass::print_on(st); 3614 3615 st->print(BULLET"instance size: %d", size_helper()); st->cr(); 3616 st->print(BULLET"klass size: %d", size()); st->cr(); 3617 st->print(BULLET"access: "); access_flags().print_on(st); st->cr(); 3618 st->print(BULLET"misc flags: 0x%x", _misc_status.flags()); st->cr(); 3619 st->print(BULLET"state: "); st->print_cr("%s", init_state_name()); 3620 st->print(BULLET"name: "); name()->print_value_on(st); st->cr(); 3621 st->print(BULLET"super: "); Metadata::print_value_on_maybe_null(st, super()); st->cr(); 3622 st->print(BULLET"sub: "); 3623 Klass* sub = subklass(); 3624 int n; 3625 for (n = 0; sub != NULL; n++, sub = sub->next_sibling()) { 3626 if (n < MaxSubklassPrintSize) { 3627 sub->print_value_on(st); 3628 st->print(" "); 3629 } 3630 } 3631 if (n >= MaxSubklassPrintSize) st->print("(" INTX_FORMAT " more klasses...)", n - MaxSubklassPrintSize); 3632 st->cr(); 3633 3634 if (is_interface()) { 3635 st->print_cr(BULLET"nof implementors: %d", nof_implementors()); 3636 if (nof_implementors() == 1) { 3637 st->print_cr(BULLET"implementor: "); 3638 st->print(" "); 3639 implementor()->print_value_on(st); 3640 st->cr(); 3641 } 3642 } 3643 3644 st->print(BULLET"arrays: "); Metadata::print_value_on_maybe_null(st, array_klasses()); st->cr(); 3645 st->print(BULLET"methods: "); print_array_on(st, methods()); 3646 st->print(BULLET"method ordering: "); print_array_on(st, method_ordering()); 3647 st->print(BULLET"default_methods: "); print_array_on(st, default_methods()); 3648 if (default_vtable_indices() != NULL) { 3649 st->print(BULLET"default vtable indices: "); print_array_on(st, default_vtable_indices()); 3650 } 3651 st->print(BULLET"local interfaces: "); print_array_on(st, local_interfaces()); 3652 st->print(BULLET"trans. interfaces: "); print_array_on(st, transitive_interfaces()); 3653 st->print(BULLET"constants: "); constants()->print_value_on(st); st->cr(); 3654 if (class_loader_data() != NULL) { 3655 st->print(BULLET"class loader data: "); 3656 class_loader_data()->print_value_on(st); 3657 st->cr(); 3658 } 3659 if (source_file_name() != NULL) { 3660 st->print(BULLET"source file: "); 3661 source_file_name()->print_value_on(st); 3662 st->cr(); 3663 } 3664 if (source_debug_extension() != NULL) { 3665 st->print(BULLET"source debug extension: "); 3666 st->print("%s", source_debug_extension()); 3667 st->cr(); 3668 } 3669 st->print(BULLET"class annotations: "); class_annotations()->print_value_on(st); st->cr(); 3670 st->print(BULLET"class type annotations: "); class_type_annotations()->print_value_on(st); st->cr(); 3671 st->print(BULLET"field annotations: "); fields_annotations()->print_value_on(st); st->cr(); 3672 st->print(BULLET"field type annotations: "); fields_type_annotations()->print_value_on(st); st->cr(); 3673 { 3674 bool have_pv = false; 3675 // previous versions are linked together through the InstanceKlass 3676 for (InstanceKlass* pv_node = previous_versions(); 3677 pv_node != NULL; 3678 pv_node = pv_node->previous_versions()) { 3679 if (!have_pv) 3680 st->print(BULLET"previous version: "); 3681 have_pv = true; 3682 pv_node->constants()->print_value_on(st); 3683 } 3684 if (have_pv) st->cr(); 3685 } 3686 3687 if (generic_signature() != NULL) { 3688 st->print(BULLET"generic signature: "); 3689 generic_signature()->print_value_on(st); 3690 st->cr(); 3691 } 3692 st->print(BULLET"inner classes: "); inner_classes()->print_value_on(st); st->cr(); 3693 st->print(BULLET"nest members: "); nest_members()->print_value_on(st); st->cr(); 3694 if (record_components() != NULL) { 3695 st->print(BULLET"record components: "); record_components()->print_value_on(st); st->cr(); 3696 } 3697 st->print(BULLET"permitted subclasses: "); permitted_subclasses()->print_value_on(st); st->cr(); 3698 st->print(BULLET"preload classes: "); preload_classes()->print_value_on(st); st->cr(); 3699 if (java_mirror() != NULL) { 3700 st->print(BULLET"java mirror: "); 3701 java_mirror()->print_value_on(st); 3702 st->cr(); 3703 } else { 3704 st->print_cr(BULLET"java mirror: NULL"); 3705 } 3706 st->print(BULLET"vtable length %d (start addr: " PTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr(); 3707 if (vtable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_vtable(), vtable_length(), st); 3708 st->print(BULLET"itable length %d (start addr: " PTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr(); 3709 if (itable_length() > 0 && (Verbose || WizardMode)) print_vtable(NULL, start_of_itable(), itable_length(), st); 3710 st->print_cr(BULLET"---- static fields (%d words):", static_field_size()); 3711 FieldPrinter print_static_field(st); 3712 ((InstanceKlass*)this)->do_local_static_fields(&print_static_field); 3713 st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size()); 3714 FieldPrinter print_nonstatic_field(st); 3715 InstanceKlass* ik = const_cast<InstanceKlass*>(this); 3716 ik->print_nonstatic_fields(&print_nonstatic_field); 3717 3718 st->print(BULLET"non-static oop maps: "); 3719 OopMapBlock* map = start_of_nonstatic_oop_maps(); 3720 OopMapBlock* end_map = map + nonstatic_oop_map_count(); 3721 while (map < end_map) { 3722 st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1)); 3723 map++; 3724 } 3725 st->cr(); 3726 } 3727 3728 void InstanceKlass::print_value_on(outputStream* st) const { 3729 assert(is_klass(), "must be klass"); 3730 if (Verbose || WizardMode) access_flags().print_on(st); 3731 name()->print_value_on(st); 3732 } 3733 3734 void FieldPrinter::do_field(fieldDescriptor* fd) { 3735 _st->print(BULLET); 3736 if (_obj == NULL) { 3737 fd->print_on(_st); 3738 _st->cr(); 3739 } else { 3740 fd->print_on_for(_st, _obj); 3741 _st->cr(); 3742 } 3743 } 3744 3745 3746 void InstanceKlass::oop_print_on(oop obj, outputStream* st) { 3747 Klass::oop_print_on(obj, st); 3748 3749 if (this == vmClasses::String_klass()) { 3750 typeArrayOop value = java_lang_String::value(obj); 3751 juint length = java_lang_String::length(obj); 3752 if (value != NULL && 3753 value->is_typeArray() && 3754 length <= (juint) value->length()) { 3755 st->print(BULLET"string: "); 3756 java_lang_String::print(obj, st); 3757 st->cr(); 3758 } 3759 } 3760 3761 st->print_cr(BULLET"---- fields (total size " SIZE_FORMAT " words):", oop_size(obj)); 3762 FieldPrinter print_field(st, obj); 3763 print_nonstatic_fields(&print_field); 3764 3765 if (this == vmClasses::Class_klass()) { 3766 st->print(BULLET"signature: "); 3767 java_lang_Class::print_signature(obj, st); 3768 st->cr(); 3769 Klass* real_klass = java_lang_Class::as_Klass(obj); 3770 if (real_klass != NULL && real_klass->is_instance_klass()) { 3771 st->print_cr(BULLET"---- static fields (%d):", java_lang_Class::static_oop_field_count(obj)); 3772 InstanceKlass::cast(real_klass)->do_local_static_fields(&print_field); 3773 } 3774 } else if (this == vmClasses::MethodType_klass()) { 3775 st->print(BULLET"signature: "); 3776 java_lang_invoke_MethodType::print_signature(obj, st); 3777 st->cr(); 3778 } 3779 } 3780 3781 #ifndef PRODUCT 3782 3783 bool InstanceKlass::verify_itable_index(int i) { 3784 int method_count = klassItable::method_count_for_interface(this); 3785 assert(i >= 0 && i < method_count, "index out of bounds"); 3786 return true; 3787 } 3788 3789 #endif //PRODUCT 3790 3791 void InstanceKlass::oop_print_value_on(oop obj, outputStream* st) { 3792 st->print("a "); 3793 name()->print_value_on(st); 3794 obj->print_address_on(st); 3795 if (this == vmClasses::String_klass() 3796 && java_lang_String::value(obj) != NULL) { 3797 ResourceMark rm; 3798 int len = java_lang_String::length(obj); 3799 int plen = (len < 24 ? len : 12); 3800 char* str = java_lang_String::as_utf8_string(obj, 0, plen); 3801 st->print(" = \"%s\"", str); 3802 if (len > plen) 3803 st->print("...[%d]", len); 3804 } else if (this == vmClasses::Class_klass()) { 3805 Klass* k = java_lang_Class::as_Klass(obj); 3806 st->print(" = "); 3807 if (k != NULL) { 3808 k->print_value_on(st); 3809 } else { 3810 const char* tname = type2name(java_lang_Class::primitive_type(obj)); 3811 st->print("%s", tname ? tname : "type?"); 3812 } 3813 } else if (this == vmClasses::MethodType_klass()) { 3814 st->print(" = "); 3815 java_lang_invoke_MethodType::print_signature(obj, st); 3816 } else if (java_lang_boxing_object::is_instance(obj)) { 3817 st->print(" = "); 3818 java_lang_boxing_object::print(obj, st); 3819 } else if (this == vmClasses::LambdaForm_klass()) { 3820 oop vmentry = java_lang_invoke_LambdaForm::vmentry(obj); 3821 if (vmentry != NULL) { 3822 st->print(" => "); 3823 vmentry->print_value_on(st); 3824 } 3825 } else if (this == vmClasses::MemberName_klass()) { 3826 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(obj); 3827 if (vmtarget != NULL) { 3828 st->print(" = "); 3829 vmtarget->print_value_on(st); 3830 } else { 3831 oop clazz = java_lang_invoke_MemberName::clazz(obj); 3832 oop name = java_lang_invoke_MemberName::name(obj); 3833 if (clazz != NULL) { 3834 clazz->print_value_on(st); 3835 } else { 3836 st->print("NULL"); 3837 } 3838 st->print("."); 3839 if (name != NULL) { 3840 name->print_value_on(st); 3841 } else { 3842 st->print("NULL"); 3843 } 3844 } 3845 } 3846 } 3847 3848 const char* InstanceKlass::internal_name() const { 3849 return external_name(); 3850 } 3851 3852 void InstanceKlass::print_class_load_logging(ClassLoaderData* loader_data, 3853 const ModuleEntry* module_entry, 3854 const ClassFileStream* cfs) const { 3855 if (ClassListWriter::is_enabled()) { 3856 ClassListWriter::write(this, cfs); 3857 } 3858 3859 if (!log_is_enabled(Info, class, load)) { 3860 return; 3861 } 3862 3863 ResourceMark rm; 3864 LogMessage(class, load) msg; 3865 stringStream info_stream; 3866 3867 // Name and class hierarchy info 3868 info_stream.print("%s", external_name()); 3869 3870 // Source 3871 if (cfs != NULL) { 3872 if (cfs->source() != NULL) { 3873 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string(); 3874 if (module_name != NULL) { 3875 // When the boot loader created the stream, it didn't know the module name 3876 // yet. Let's format it now. 3877 if (cfs->from_boot_loader_modules_image()) { 3878 info_stream.print(" source: jrt:/%s", module_name); 3879 } else { 3880 info_stream.print(" source: %s", cfs->source()); 3881 } 3882 } else { 3883 info_stream.print(" source: %s", cfs->source()); 3884 } 3885 } else if (loader_data == ClassLoaderData::the_null_class_loader_data()) { 3886 Thread* current = Thread::current(); 3887 Klass* caller = current->is_Java_thread() ? 3888 JavaThread::cast(current)->security_get_caller_class(1): 3889 NULL; 3890 // caller can be NULL, for example, during a JVMTI VM_Init hook 3891 if (caller != NULL) { 3892 info_stream.print(" source: instance of %s", caller->external_name()); 3893 } else { 3894 // source is unknown 3895 } 3896 } else { 3897 oop class_loader = loader_data->class_loader(); 3898 info_stream.print(" source: %s", class_loader->klass()->external_name()); 3899 } 3900 } else { 3901 assert(this->is_shared(), "must be"); 3902 if (MetaspaceShared::is_shared_dynamic((void*)this)) { 3903 info_stream.print(" source: shared objects file (top)"); 3904 } else { 3905 info_stream.print(" source: shared objects file"); 3906 } 3907 } 3908 3909 msg.info("%s", info_stream.as_string()); 3910 3911 if (log_is_enabled(Debug, class, load)) { 3912 stringStream debug_stream; 3913 3914 // Class hierarchy info 3915 debug_stream.print(" klass: " PTR_FORMAT " super: " PTR_FORMAT, 3916 p2i(this), p2i(superklass())); 3917 3918 // Interfaces 3919 if (local_interfaces() != NULL && local_interfaces()->length() > 0) { 3920 debug_stream.print(" interfaces:"); 3921 int length = local_interfaces()->length(); 3922 for (int i = 0; i < length; i++) { 3923 debug_stream.print(" " PTR_FORMAT, 3924 p2i(InstanceKlass::cast(local_interfaces()->at(i)))); 3925 } 3926 } 3927 3928 // Class loader 3929 debug_stream.print(" loader: ["); 3930 loader_data->print_value_on(&debug_stream); 3931 debug_stream.print("]"); 3932 3933 // Classfile checksum 3934 if (cfs) { 3935 debug_stream.print(" bytes: %d checksum: %08x", 3936 cfs->length(), 3937 ClassLoader::crc32(0, (const char*)cfs->buffer(), 3938 cfs->length())); 3939 } 3940 3941 msg.debug("%s", debug_stream.as_string()); 3942 } 3943 } 3944 3945 // Verification 3946 3947 class VerifyFieldClosure: public BasicOopIterateClosure { 3948 protected: 3949 template <class T> void do_oop_work(T* p) { 3950 oop obj = RawAccess<>::oop_load(p); 3951 if (!oopDesc::is_oop_or_null(obj)) { 3952 tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p2i(p), p2i(obj)); 3953 Universe::print_on(tty); 3954 guarantee(false, "boom"); 3955 } 3956 } 3957 public: 3958 virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); } 3959 virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); } 3960 }; 3961 3962 void InstanceKlass::verify_on(outputStream* st) { 3963 #ifndef PRODUCT 3964 // Avoid redundant verifies, this really should be in product. 3965 if (_verify_count == Universe::verify_count()) return; 3966 _verify_count = Universe::verify_count(); 3967 #endif 3968 3969 // Verify Klass 3970 Klass::verify_on(st); 3971 3972 // Verify that klass is present in ClassLoaderData 3973 guarantee(class_loader_data()->contains_klass(this), 3974 "this class isn't found in class loader data"); 3975 3976 // Verify vtables 3977 if (is_linked()) { 3978 // $$$ This used to be done only for m/s collections. Doing it 3979 // always seemed a valid generalization. (DLD -- 6/00) 3980 vtable().verify(st); 3981 } 3982 3983 // Verify first subklass 3984 if (subklass() != NULL) { 3985 guarantee(subklass()->is_klass(), "should be klass"); 3986 } 3987 3988 // Verify siblings 3989 Klass* super = this->super(); 3990 Klass* sib = next_sibling(); 3991 if (sib != NULL) { 3992 if (sib == this) { 3993 fatal("subclass points to itself " PTR_FORMAT, p2i(sib)); 3994 } 3995 3996 guarantee(sib->is_klass(), "should be klass"); 3997 guarantee(sib->super() == super, "siblings should have same superklass"); 3998 } 3999 4000 // Verify local interfaces 4001 if (local_interfaces()) { 4002 Array<InstanceKlass*>* local_interfaces = this->local_interfaces(); 4003 for (int j = 0; j < local_interfaces->length(); j++) { 4004 InstanceKlass* e = local_interfaces->at(j); 4005 guarantee(e->is_klass() && e->is_interface(), "invalid local interface"); 4006 } 4007 } 4008 4009 // Verify transitive interfaces 4010 if (transitive_interfaces() != NULL) { 4011 Array<InstanceKlass*>* transitive_interfaces = this->transitive_interfaces(); 4012 for (int j = 0; j < transitive_interfaces->length(); j++) { 4013 InstanceKlass* e = transitive_interfaces->at(j); 4014 guarantee(e->is_klass() && e->is_interface(), "invalid transitive interface"); 4015 } 4016 } 4017 4018 // Verify methods 4019 if (methods() != NULL) { 4020 Array<Method*>* methods = this->methods(); 4021 for (int j = 0; j < methods->length(); j++) { 4022 guarantee(methods->at(j)->is_method(), "non-method in methods array"); 4023 } 4024 for (int j = 0; j < methods->length() - 1; j++) { 4025 Method* m1 = methods->at(j); 4026 Method* m2 = methods->at(j + 1); 4027 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly"); 4028 } 4029 } 4030 4031 // Verify method ordering 4032 if (method_ordering() != NULL) { 4033 Array<int>* method_ordering = this->method_ordering(); 4034 int length = method_ordering->length(); 4035 if (JvmtiExport::can_maintain_original_method_order() || 4036 ((UseSharedSpaces || Arguments::is_dumping_archive()) && length != 0)) { 4037 guarantee(length == methods()->length(), "invalid method ordering length"); 4038 jlong sum = 0; 4039 for (int j = 0; j < length; j++) { 4040 int original_index = method_ordering->at(j); 4041 guarantee(original_index >= 0, "invalid method ordering index"); 4042 guarantee(original_index < length, "invalid method ordering index"); 4043 sum += original_index; 4044 } 4045 // Verify sum of indices 0,1,...,length-1 4046 guarantee(sum == ((jlong)length*(length-1))/2, "invalid method ordering sum"); 4047 } else { 4048 guarantee(length == 0, "invalid method ordering length"); 4049 } 4050 } 4051 4052 // Verify default methods 4053 if (default_methods() != NULL) { 4054 Array<Method*>* methods = this->default_methods(); 4055 for (int j = 0; j < methods->length(); j++) { 4056 guarantee(methods->at(j)->is_method(), "non-method in methods array"); 4057 } 4058 for (int j = 0; j < methods->length() - 1; j++) { 4059 Method* m1 = methods->at(j); 4060 Method* m2 = methods->at(j + 1); 4061 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly"); 4062 } 4063 } 4064 4065 // Verify JNI static field identifiers 4066 if (jni_ids() != NULL) { 4067 jni_ids()->verify(this); 4068 } 4069 4070 // Verify other fields 4071 if (constants() != NULL) { 4072 guarantee(constants()->is_constantPool(), "should be constant pool"); 4073 } 4074 } 4075 4076 void InstanceKlass::oop_verify_on(oop obj, outputStream* st) { 4077 Klass::oop_verify_on(obj, st); 4078 VerifyFieldClosure blk; 4079 obj->oop_iterate(&blk); 4080 } 4081 4082 4083 // JNIid class for jfieldIDs only 4084 // Note to reviewers: 4085 // These JNI functions are just moved over to column 1 and not changed 4086 // in the compressed oops workspace. 4087 JNIid::JNIid(Klass* holder, int offset, JNIid* next) { 4088 _holder = holder; 4089 _offset = offset; 4090 _next = next; 4091 debug_only(_is_static_field_id = false;) 4092 } 4093 4094 4095 JNIid* JNIid::find(int offset) { 4096 JNIid* current = this; 4097 while (current != NULL) { 4098 if (current->offset() == offset) return current; 4099 current = current->next(); 4100 } 4101 return NULL; 4102 } 4103 4104 void JNIid::deallocate(JNIid* current) { 4105 while (current != NULL) { 4106 JNIid* next = current->next(); 4107 delete current; 4108 current = next; 4109 } 4110 } 4111 4112 4113 void JNIid::verify(Klass* holder) { 4114 int first_field_offset = InstanceMirrorKlass::offset_of_static_fields(); 4115 int end_field_offset; 4116 end_field_offset = first_field_offset + (InstanceKlass::cast(holder)->static_field_size() * wordSize); 4117 4118 JNIid* current = this; 4119 while (current != NULL) { 4120 guarantee(current->holder() == holder, "Invalid klass in JNIid"); 4121 #ifdef ASSERT 4122 int o = current->offset(); 4123 if (current->is_static_field_id()) { 4124 guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid"); 4125 } 4126 #endif 4127 current = current->next(); 4128 } 4129 } 4130 4131 void InstanceKlass::set_init_state(ClassState state) { 4132 if (state > loaded) { 4133 assert_lock_strong(_init_monitor); 4134 } 4135 #ifdef ASSERT 4136 bool good_state = is_shared() ? (_init_state <= state) 4137 : (_init_state < state); 4138 bool link_failed = _init_state == being_linked && state == loaded; 4139 assert(good_state || state == allocated || link_failed, "illegal state transition"); 4140 #endif 4141 assert(_init_thread == NULL, "should be cleared before state change"); 4142 _init_state = state; 4143 } 4144 4145 #if INCLUDE_JVMTI 4146 4147 // RedefineClasses() support for previous versions 4148 4149 // Globally, there is at least one previous version of a class to walk 4150 // during class unloading, which is saved because old methods in the class 4151 // are still running. Otherwise the previous version list is cleaned up. 4152 bool InstanceKlass::_has_previous_versions = false; 4153 4154 // Returns true if there are previous versions of a class for class 4155 // unloading only. Also resets the flag to false. purge_previous_version 4156 // will set the flag to true if there are any left, i.e., if there's any 4157 // work to do for next time. This is to avoid the expensive code cache 4158 // walk in CLDG::clean_deallocate_lists(). 4159 bool InstanceKlass::has_previous_versions_and_reset() { 4160 bool ret = _has_previous_versions; 4161 log_trace(redefine, class, iklass, purge)("Class unloading: has_previous_versions = %s", 4162 ret ? "true" : "false"); 4163 _has_previous_versions = false; 4164 return ret; 4165 } 4166 4167 // Purge previous versions before adding new previous versions of the class and 4168 // during class unloading. 4169 void InstanceKlass::purge_previous_version_list() { 4170 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); 4171 assert(has_been_redefined(), "Should only be called for main class"); 4172 4173 // Quick exit. 4174 if (previous_versions() == NULL) { 4175 return; 4176 } 4177 4178 // This klass has previous versions so see what we can cleanup 4179 // while it is safe to do so. 4180 4181 int deleted_count = 0; // leave debugging breadcrumbs 4182 int live_count = 0; 4183 ClassLoaderData* loader_data = class_loader_data(); 4184 assert(loader_data != NULL, "should never be null"); 4185 4186 ResourceMark rm; 4187 log_trace(redefine, class, iklass, purge)("%s: previous versions", external_name()); 4188 4189 // previous versions are linked together through the InstanceKlass 4190 InstanceKlass* pv_node = previous_versions(); 4191 InstanceKlass* last = this; 4192 int version = 0; 4193 4194 // check the previous versions list 4195 for (; pv_node != NULL; ) { 4196 4197 ConstantPool* pvcp = pv_node->constants(); 4198 assert(pvcp != NULL, "cp ref was unexpectedly cleared"); 4199 4200 if (!pvcp->on_stack()) { 4201 // If the constant pool isn't on stack, none of the methods 4202 // are executing. Unlink this previous_version. 4203 // The previous version InstanceKlass is on the ClassLoaderData deallocate list 4204 // so will be deallocated during the next phase of class unloading. 4205 log_trace(redefine, class, iklass, purge) 4206 ("previous version " PTR_FORMAT " is dead.", p2i(pv_node)); 4207 // Unlink from previous version list. 4208 assert(pv_node->class_loader_data() == loader_data, "wrong loader_data"); 4209 InstanceKlass* next = pv_node->previous_versions(); 4210 pv_node->link_previous_versions(NULL); // point next to NULL 4211 last->link_previous_versions(next); 4212 // Delete this node directly. Nothing is referring to it and we don't 4213 // want it to increase the counter for metadata to delete in CLDG. 4214 MetadataFactory::free_metadata(loader_data, pv_node); 4215 pv_node = next; 4216 deleted_count++; 4217 version++; 4218 continue; 4219 } else { 4220 log_trace(redefine, class, iklass, purge)("previous version " PTR_FORMAT " is alive", p2i(pv_node)); 4221 assert(pvcp->pool_holder() != NULL, "Constant pool with no holder"); 4222 guarantee (!loader_data->is_unloading(), "unloaded classes can't be on the stack"); 4223 live_count++; 4224 // found a previous version for next time we do class unloading 4225 _has_previous_versions = true; 4226 } 4227 4228 // next previous version 4229 last = pv_node; 4230 pv_node = pv_node->previous_versions(); 4231 version++; 4232 } 4233 log_trace(redefine, class, iklass, purge) 4234 ("previous version stats: live=%d, deleted=%d", live_count, deleted_count); 4235 } 4236 4237 void InstanceKlass::mark_newly_obsolete_methods(Array<Method*>* old_methods, 4238 int emcp_method_count) { 4239 int obsolete_method_count = old_methods->length() - emcp_method_count; 4240 4241 if (emcp_method_count != 0 && obsolete_method_count != 0 && 4242 _previous_versions != NULL) { 4243 // We have a mix of obsolete and EMCP methods so we have to 4244 // clear out any matching EMCP method entries the hard way. 4245 int local_count = 0; 4246 for (int i = 0; i < old_methods->length(); i++) { 4247 Method* old_method = old_methods->at(i); 4248 if (old_method->is_obsolete()) { 4249 // only obsolete methods are interesting 4250 Symbol* m_name = old_method->name(); 4251 Symbol* m_signature = old_method->signature(); 4252 4253 // previous versions are linked together through the InstanceKlass 4254 int j = 0; 4255 for (InstanceKlass* prev_version = _previous_versions; 4256 prev_version != NULL; 4257 prev_version = prev_version->previous_versions(), j++) { 4258 4259 Array<Method*>* method_refs = prev_version->methods(); 4260 for (int k = 0; k < method_refs->length(); k++) { 4261 Method* method = method_refs->at(k); 4262 4263 if (!method->is_obsolete() && 4264 method->name() == m_name && 4265 method->signature() == m_signature) { 4266 // The current RedefineClasses() call has made all EMCP 4267 // versions of this method obsolete so mark it as obsolete 4268 log_trace(redefine, class, iklass, add) 4269 ("%s(%s): flush obsolete method @%d in version @%d", 4270 m_name->as_C_string(), m_signature->as_C_string(), k, j); 4271 4272 method->set_is_obsolete(); 4273 break; 4274 } 4275 } 4276 4277 // The previous loop may not find a matching EMCP method, but 4278 // that doesn't mean that we can optimize and not go any 4279 // further back in the PreviousVersion generations. The EMCP 4280 // method for this generation could have already been made obsolete, 4281 // but there still may be an older EMCP method that has not 4282 // been made obsolete. 4283 } 4284 4285 if (++local_count >= obsolete_method_count) { 4286 // no more obsolete methods so bail out now 4287 break; 4288 } 4289 } 4290 } 4291 } 4292 } 4293 4294 // Save the scratch_class as the previous version if any of the methods are running. 4295 // The previous_versions are used to set breakpoints in EMCP methods and they are 4296 // also used to clean MethodData links to redefined methods that are no longer running. 4297 void InstanceKlass::add_previous_version(InstanceKlass* scratch_class, 4298 int emcp_method_count) { 4299 assert(Thread::current()->is_VM_thread(), 4300 "only VMThread can add previous versions"); 4301 4302 ResourceMark rm; 4303 log_trace(redefine, class, iklass, add) 4304 ("adding previous version ref for %s, EMCP_cnt=%d", scratch_class->external_name(), emcp_method_count); 4305 4306 // Clean out old previous versions for this class 4307 purge_previous_version_list(); 4308 4309 // Mark newly obsolete methods in remaining previous versions. An EMCP method from 4310 // a previous redefinition may be made obsolete by this redefinition. 4311 Array<Method*>* old_methods = scratch_class->methods(); 4312 mark_newly_obsolete_methods(old_methods, emcp_method_count); 4313 4314 // If the constant pool for this previous version of the class 4315 // is not marked as being on the stack, then none of the methods 4316 // in this previous version of the class are on the stack so 4317 // we don't need to add this as a previous version. 4318 ConstantPool* cp_ref = scratch_class->constants(); 4319 if (!cp_ref->on_stack()) { 4320 log_trace(redefine, class, iklass, add)("scratch class not added; no methods are running"); 4321 scratch_class->class_loader_data()->add_to_deallocate_list(scratch_class); 4322 return; 4323 } 4324 4325 // Add previous version if any methods are still running. 4326 // Set has_previous_version flag for processing during class unloading. 4327 _has_previous_versions = true; 4328 log_trace(redefine, class, iklass, add) ("scratch class added; one of its methods is on_stack."); 4329 assert(scratch_class->previous_versions() == NULL, "shouldn't have a previous version"); 4330 scratch_class->link_previous_versions(previous_versions()); 4331 link_previous_versions(scratch_class); 4332 } // end add_previous_version() 4333 4334 #endif // INCLUDE_JVMTI 4335 4336 Method* InstanceKlass::method_with_idnum(int idnum) { 4337 Method* m = NULL; 4338 if (idnum < methods()->length()) { 4339 m = methods()->at(idnum); 4340 } 4341 if (m == NULL || m->method_idnum() != idnum) { 4342 for (int index = 0; index < methods()->length(); ++index) { 4343 m = methods()->at(index); 4344 if (m->method_idnum() == idnum) { 4345 return m; 4346 } 4347 } 4348 // None found, return null for the caller to handle. 4349 return NULL; 4350 } 4351 return m; 4352 } 4353 4354 4355 Method* InstanceKlass::method_with_orig_idnum(int idnum) { 4356 if (idnum >= methods()->length()) { 4357 return NULL; 4358 } 4359 Method* m = methods()->at(idnum); 4360 if (m != NULL && m->orig_method_idnum() == idnum) { 4361 return m; 4362 } 4363 // Obsolete method idnum does not match the original idnum 4364 for (int index = 0; index < methods()->length(); ++index) { 4365 m = methods()->at(index); 4366 if (m->orig_method_idnum() == idnum) { 4367 return m; 4368 } 4369 } 4370 // None found, return null for the caller to handle. 4371 return NULL; 4372 } 4373 4374 4375 Method* InstanceKlass::method_with_orig_idnum(int idnum, int version) { 4376 InstanceKlass* holder = get_klass_version(version); 4377 if (holder == NULL) { 4378 return NULL; // The version of klass is gone, no method is found 4379 } 4380 Method* method = holder->method_with_orig_idnum(idnum); 4381 return method; 4382 } 4383 4384 #if INCLUDE_JVMTI 4385 JvmtiCachedClassFileData* InstanceKlass::get_cached_class_file() { 4386 return _cached_class_file; 4387 } 4388 4389 jint InstanceKlass::get_cached_class_file_len() { 4390 return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file); 4391 } 4392 4393 unsigned char * InstanceKlass::get_cached_class_file_bytes() { 4394 return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file); 4395 } 4396 #endif 4397 4398 // Make a step iterating over the class hierarchy under the root class. 4399 // Skips subclasses if requested. 4400 void ClassHierarchyIterator::next() { 4401 assert(_current != NULL, "required"); 4402 if (_visit_subclasses && _current->subklass() != NULL) { 4403 _current = _current->subklass(); 4404 return; // visit next subclass 4405 } 4406 _visit_subclasses = true; // reset 4407 while (_current->next_sibling() == NULL && _current != _root) { 4408 _current = _current->superklass(); // backtrack; no more sibling subclasses left 4409 } 4410 if (_current == _root) { 4411 // Iteration is over (back at root after backtracking). Invalidate the iterator. 4412 _current = NULL; 4413 return; 4414 } 4415 _current = _current->next_sibling(); 4416 return; // visit next sibling subclass 4417 }