1 /* 2 * Copyright (c) 1997, 2019, 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 "jvm.h" 27 #include "aot/aotLoader.hpp" 28 #include "classfile/classFileParser.hpp" 29 #include "classfile/classFileStream.hpp" 30 #include "classfile/classLoader.hpp" 31 #include "classfile/classLoaderData.inline.hpp" 32 #include "classfile/javaClasses.hpp" 33 #include "classfile/moduleEntry.hpp" 34 #include "classfile/symbolTable.hpp" 35 #include "classfile/systemDictionary.hpp" 36 #include "classfile/systemDictionaryShared.hpp" 37 #include "classfile/verifier.hpp" 38 #include "classfile/vmSymbols.hpp" 39 #include "code/dependencyContext.hpp" 40 #include "compiler/compileBroker.hpp" 41 #include "gc/shared/collectedHeap.inline.hpp" 42 #include "interpreter/oopMapCache.hpp" 43 #include "interpreter/rewriter.hpp" 44 #include "jvmtifiles/jvmti.h" 45 #include "logging/log.hpp" 46 #include "logging/logMessage.hpp" 47 #include "logging/logStream.hpp" 48 #include "memory/allocation.inline.hpp" 49 #include "memory/heapInspection.hpp" 50 #include "memory/iterator.inline.hpp" 51 #include "memory/metadataFactory.hpp" 52 #include "memory/metaspaceClosure.hpp" 53 #include "memory/metaspaceShared.hpp" 54 #include "memory/oopFactory.hpp" 55 #include "memory/resourceArea.hpp" 56 #include "memory/universe.hpp" 57 #include "oops/fieldStreams.inline.hpp" 58 #include "oops/constantPool.hpp" 59 #include "oops/instanceClassLoaderKlass.hpp" 60 #include "oops/instanceKlass.inline.hpp" 61 #include "oops/instanceMirrorKlass.hpp" 62 #include "oops/instanceOop.hpp" 63 #include "oops/klass.inline.hpp" 64 #include "oops/method.hpp" 65 #include "oops/oop.inline.hpp" 66 #include "oops/symbol.hpp" 67 #include "prims/jvmtiExport.hpp" 68 #include "prims/jvmtiRedefineClasses.hpp" 69 #include "prims/jvmtiThreadState.hpp" 70 #include "prims/methodComparator.hpp" 71 #include "runtime/atomic.hpp" 72 #include "runtime/biasedLocking.hpp" 73 #include "runtime/fieldDescriptor.inline.hpp" 74 #include "runtime/handles.inline.hpp" 75 #include "runtime/javaCalls.hpp" 76 #include "runtime/mutexLocker.hpp" 77 #include "runtime/orderAccess.hpp" 78 #include "runtime/thread.inline.hpp" 79 #include "services/classLoadingService.hpp" 80 #include "services/threadService.hpp" 81 #include "utilities/dtrace.hpp" 82 #include "utilities/events.hpp" 83 #include "utilities/macros.hpp" 84 #include "utilities/stringUtils.hpp" 85 #ifdef COMPILER1 86 #include "c1/c1_Compiler.hpp" 87 #endif 88 #if INCLUDE_JFR 89 #include "jfr/jfrEvents.hpp" 90 #endif 91 92 93 #ifdef DTRACE_ENABLED 94 95 96 #define HOTSPOT_CLASS_INITIALIZATION_required HOTSPOT_CLASS_INITIALIZATION_REQUIRED 97 #define HOTSPOT_CLASS_INITIALIZATION_recursive HOTSPOT_CLASS_INITIALIZATION_RECURSIVE 98 #define HOTSPOT_CLASS_INITIALIZATION_concurrent HOTSPOT_CLASS_INITIALIZATION_CONCURRENT 99 #define HOTSPOT_CLASS_INITIALIZATION_erroneous HOTSPOT_CLASS_INITIALIZATION_ERRONEOUS 100 #define HOTSPOT_CLASS_INITIALIZATION_super__failed HOTSPOT_CLASS_INITIALIZATION_SUPER_FAILED 101 #define HOTSPOT_CLASS_INITIALIZATION_clinit HOTSPOT_CLASS_INITIALIZATION_CLINIT 102 #define HOTSPOT_CLASS_INITIALIZATION_error HOTSPOT_CLASS_INITIALIZATION_ERROR 103 #define HOTSPOT_CLASS_INITIALIZATION_end HOTSPOT_CLASS_INITIALIZATION_END 104 #define DTRACE_CLASSINIT_PROBE(type, thread_type) \ 105 { \ 106 char* data = NULL; \ 107 int len = 0; \ 108 Symbol* clss_name = name(); \ 109 if (clss_name != NULL) { \ 110 data = (char*)clss_name->bytes(); \ 111 len = clss_name->utf8_length(); \ 112 } \ 113 HOTSPOT_CLASS_INITIALIZATION_##type( \ 114 data, len, (void*)class_loader(), thread_type); \ 115 } 116 117 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait) \ 118 { \ 119 char* data = NULL; \ 120 int len = 0; \ 121 Symbol* clss_name = name(); \ 122 if (clss_name != NULL) { \ 123 data = (char*)clss_name->bytes(); \ 124 len = clss_name->utf8_length(); \ 125 } \ 126 HOTSPOT_CLASS_INITIALIZATION_##type( \ 127 data, len, (void*)class_loader(), thread_type, wait); \ 128 } 129 130 #else // ndef DTRACE_ENABLED 131 132 #define DTRACE_CLASSINIT_PROBE(type, thread_type) 133 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait) 134 135 #endif // ndef DTRACE_ENABLED 136 137 static inline bool is_class_loader(const Symbol* class_name, 138 const ClassFileParser& parser) { 139 assert(class_name != NULL, "invariant"); 140 141 if (class_name == vmSymbols::java_lang_ClassLoader()) { 142 return true; 143 } 144 145 if (SystemDictionary::ClassLoader_klass_loaded()) { 146 const Klass* const super_klass = parser.super_klass(); 147 if (super_klass != NULL) { 148 if (super_klass->is_subtype_of(SystemDictionary::ClassLoader_klass())) { 149 return true; 150 } 151 } 152 } 153 return false; 154 } 155 156 // called to verify that k is a member of this nest 157 bool InstanceKlass::has_nest_member(InstanceKlass* k, TRAPS) const { 158 if (_nest_members == NULL || _nest_members == Universe::the_empty_short_array()) { 159 if (log_is_enabled(Trace, class, nestmates)) { 160 ResourceMark rm(THREAD); 161 log_trace(class, nestmates)("Checked nest membership of %s in non-nest-host class %s", 162 k->external_name(), this->external_name()); 163 } 164 return false; 165 } 166 167 if (log_is_enabled(Trace, class, nestmates)) { 168 ResourceMark rm(THREAD); 169 log_trace(class, nestmates)("Checking nest membership of %s in %s", 170 k->external_name(), this->external_name()); 171 } 172 173 // Check for a resolved cp entry , else fall back to a name check. 174 // We don't want to resolve any class other than the one being checked. 175 for (int i = 0; i < _nest_members->length(); i++) { 176 int cp_index = _nest_members->at(i); 177 if (_constants->tag_at(cp_index).is_klass()) { 178 Klass* k2 = _constants->klass_at(cp_index, CHECK_false); 179 if (k2 == k) { 180 log_trace(class, nestmates)("- class is listed at nest_members[%d] => cp[%d]", i, cp_index); 181 return true; 182 } 183 } 184 else { 185 Symbol* name = _constants->klass_name_at(cp_index); 186 if (name == k->name()) { 187 log_trace(class, nestmates)("- Found it at nest_members[%d] => cp[%d]", i, cp_index); 188 189 // Names match so check actual klass - this may trigger class loading if 190 // it doesn't match (though that should be impossible). But to be safe we 191 // have to check for a compiler thread executing here. 192 if (!THREAD->can_call_java() && !_constants->tag_at(cp_index).is_klass()) { 193 log_trace(class, nestmates)("- validation required resolution in an unsuitable thread"); 194 return false; 195 } 196 197 Klass* k2 = _constants->klass_at(cp_index, CHECK_false); 198 if (k2 == k) { 199 log_trace(class, nestmates)("- class is listed as a nest member"); 200 return true; 201 } 202 else { 203 // same name but different klass! 204 log_trace(class, nestmates)(" - klass comparison failed!"); 205 // can't have two names the same, so we're done 206 return false; 207 } 208 } 209 } 210 } 211 log_trace(class, nestmates)("- class is NOT a nest member!"); 212 return false; 213 } 214 215 // Return nest-host class, resolving, validating and saving it if needed. 216 // In cases where this is called from a thread that can not do classloading 217 // (such as a native JIT thread) then we simply return NULL, which in turn 218 // causes the access check to return false. Such code will retry the access 219 // from a more suitable environment later. 220 InstanceKlass* InstanceKlass::nest_host(Symbol* validationException, TRAPS) { 221 InstanceKlass* nest_host_k = _nest_host; 222 if (nest_host_k == NULL) { 223 // need to resolve and save our nest-host class. This could be attempted 224 // concurrently but as the result is idempotent and we don't use the class 225 // then we do not need any synchronization beyond what is implicitly used 226 // during class loading. 227 if (_nest_host_index != 0) { // we have a real nest_host 228 // Before trying to resolve check if we're in a suitable context 229 if (!THREAD->can_call_java() && !_constants->tag_at(_nest_host_index).is_klass()) { 230 if (log_is_enabled(Trace, class, nestmates)) { 231 ResourceMark rm(THREAD); 232 log_trace(class, nestmates)("Rejected resolution of nest-host of %s in unsuitable thread", 233 this->external_name()); 234 } 235 return NULL; 236 } 237 238 if (log_is_enabled(Trace, class, nestmates)) { 239 ResourceMark rm(THREAD); 240 log_trace(class, nestmates)("Resolving nest-host of %s using cp entry for %s", 241 this->external_name(), 242 _constants->klass_name_at(_nest_host_index)->as_C_string()); 243 } 244 245 Klass* k = _constants->klass_at(_nest_host_index, THREAD); 246 if (HAS_PENDING_EXCEPTION) { 247 Handle exc_h = Handle(THREAD, PENDING_EXCEPTION); 248 if (exc_h->is_a(SystemDictionary::NoClassDefFoundError_klass())) { 249 // throw a new CDNFE with the original as its cause, and a clear msg 250 ResourceMark rm(THREAD); 251 char buf[200]; 252 CLEAR_PENDING_EXCEPTION; 253 jio_snprintf(buf, sizeof(buf), 254 "Unable to load nest-host class (%s) of %s", 255 _constants->klass_name_at(_nest_host_index)->as_C_string(), 256 this->external_name()); 257 log_trace(class, nestmates)("%s - NoClassDefFoundError", buf); 258 THROW_MSG_CAUSE_NULL(vmSymbols::java_lang_NoClassDefFoundError(), buf, exc_h); 259 } 260 // All other exceptions pass through (OOME, StackOverflowError, LinkageErrors etc). 261 return NULL; 262 } 263 264 // A valid nest-host is an instance class in the current package that lists this 265 // class as a nest member. If any of these conditions are not met we post the 266 // requested exception type (if any) and return NULL 267 268 const char* error = NULL; 269 270 // JVMS 5.4.4 indicates package check comes first 271 if (is_same_class_package(k)) { 272 273 // Now check actual membership. We can't be a member if our "host" is 274 // not an instance class. 275 if (k->is_instance_klass()) { 276 nest_host_k = InstanceKlass::cast(k); 277 278 bool is_member = nest_host_k->has_nest_member(this, CHECK_NULL); 279 if (is_member) { 280 // save resolved nest-host value 281 _nest_host = nest_host_k; 282 283 if (log_is_enabled(Trace, class, nestmates)) { 284 ResourceMark rm(THREAD); 285 log_trace(class, nestmates)("Resolved nest-host of %s to %s", 286 this->external_name(), k->external_name()); 287 } 288 return nest_host_k; 289 } 290 } 291 error = "current type is not listed as a nest member"; 292 } else { 293 error = "types are in different packages"; 294 } 295 296 if (log_is_enabled(Trace, class, nestmates)) { 297 ResourceMark rm(THREAD); 298 log_trace(class, nestmates) 299 ("Type %s (loader: %s) is not a nest member of " 300 "resolved type %s (loader: %s): %s", 301 this->external_name(), 302 this->class_loader_data()->loader_name_and_id(), 303 k->external_name(), 304 k->class_loader_data()->loader_name_and_id(), 305 error); 306 } 307 308 if (validationException != NULL && THREAD->can_call_java()) { 309 ResourceMark rm(THREAD); 310 Exceptions::fthrow(THREAD_AND_LOCATION, 311 validationException, 312 "Type %s (loader: %s) is not a nest member of %s (loader: %s): %s", 313 this->external_name(), 314 this->class_loader_data()->loader_name_and_id(), 315 k->external_name(), 316 k->class_loader_data()->loader_name_and_id(), 317 error 318 ); 319 } 320 return NULL; 321 } else { 322 if (log_is_enabled(Trace, class, nestmates)) { 323 ResourceMark rm(THREAD); 324 log_trace(class, nestmates)("Type %s is not part of a nest: setting nest-host to self", 325 this->external_name()); 326 } 327 // save resolved nest-host value 328 return (_nest_host = this); 329 } 330 } 331 return nest_host_k; 332 } 333 334 // check if 'this' and k are nestmates (same nest_host), or k is our nest_host, 335 // or we are k's nest_host - all of which is covered by comparing the two 336 // resolved_nest_hosts 337 bool InstanceKlass::has_nestmate_access_to(InstanceKlass* k, TRAPS) { 338 339 assert(this != k, "this should be handled by higher-level code"); 340 341 // Per JVMS 5.4.4 we first resolve and validate the current class, then 342 // the target class k. Resolution exceptions will be passed on by upper 343 // layers. IncompatibleClassChangeErrors from membership validation failures 344 // will also be passed through. 345 346 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError(); 347 InstanceKlass* cur_host = nest_host(icce, CHECK_false); 348 if (cur_host == NULL) { 349 return false; 350 } 351 352 Klass* k_nest_host = k->nest_host(icce, CHECK_false); 353 if (k_nest_host == NULL) { 354 return false; 355 } 356 357 bool access = (cur_host == k_nest_host); 358 359 if (log_is_enabled(Trace, class, nestmates)) { 360 ResourceMark rm(THREAD); 361 log_trace(class, nestmates)("Class %s does %shave nestmate access to %s", 362 this->external_name(), 363 access ? "" : "NOT ", 364 k->external_name()); 365 } 366 367 return access; 368 } 369 370 InstanceKlass* InstanceKlass::allocate_instance_klass(const ClassFileParser& parser, TRAPS) { 371 const int size = InstanceKlass::size(parser.vtable_size(), 372 parser.itable_size(), 373 nonstatic_oop_map_size(parser.total_oop_map_count()), 374 parser.is_interface(), 375 parser.is_unsafe_anonymous(), 376 should_store_fingerprint(parser.is_unsafe_anonymous())); 377 378 const Symbol* const class_name = parser.class_name(); 379 assert(class_name != NULL, "invariant"); 380 ClassLoaderData* loader_data = parser.loader_data(); 381 assert(loader_data != NULL, "invariant"); 382 383 InstanceKlass* ik; 384 385 // Allocation 386 if (REF_NONE == parser.reference_type()) { 387 if (class_name == vmSymbols::java_lang_Class()) { 388 // mirror 389 ik = new (loader_data, size, THREAD) InstanceMirrorKlass(parser); 390 } 391 else if (is_class_loader(class_name, parser)) { 392 // class loader 393 ik = new (loader_data, size, THREAD) InstanceClassLoaderKlass(parser); 394 } else { 395 // normal 396 ik = new (loader_data, size, THREAD) InstanceKlass(parser, InstanceKlass::_misc_kind_other); 397 } 398 } else { 399 // reference 400 ik = new (loader_data, size, THREAD) InstanceRefKlass(parser); 401 } 402 403 // Check for pending exception before adding to the loader data and incrementing 404 // class count. Can get OOM here. 405 if (HAS_PENDING_EXCEPTION) { 406 return NULL; 407 } 408 409 return ik; 410 } 411 412 413 // copy method ordering from resource area to Metaspace 414 void InstanceKlass::copy_method_ordering(const intArray* m, TRAPS) { 415 if (m != NULL) { 416 // allocate a new array and copy contents (memcpy?) 417 _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK); 418 for (int i = 0; i < m->length(); i++) { 419 _method_ordering->at_put(i, m->at(i)); 420 } 421 } else { 422 _method_ordering = Universe::the_empty_int_array(); 423 } 424 } 425 426 // create a new array of vtable_indices for default methods 427 Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) { 428 Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL); 429 assert(default_vtable_indices() == NULL, "only create once"); 430 set_default_vtable_indices(vtable_indices); 431 return vtable_indices; 432 } 433 434 InstanceKlass::InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id) : 435 Klass(id), 436 _nest_members(NULL), 437 _nest_host_index(0), 438 _nest_host(NULL), 439 _static_field_size(parser.static_field_size()), 440 _nonstatic_oop_map_size(nonstatic_oop_map_size(parser.total_oop_map_count())), 441 _itable_len(parser.itable_size()), 442 _init_thread(NULL), 443 _init_state(allocated), 444 _reference_type(parser.reference_type()) 445 { 446 set_vtable_length(parser.vtable_size()); 447 set_kind(kind); 448 set_access_flags(parser.access_flags()); 449 set_is_unsafe_anonymous(parser.is_unsafe_anonymous()); 450 set_layout_helper(Klass::instance_layout_helper(parser.layout_size(), 451 false)); 452 453 assert(NULL == _methods, "underlying memory not zeroed?"); 454 assert(is_instance_klass(), "is layout incorrect?"); 455 assert(size_helper() == parser.layout_size(), "incorrect size_helper?"); 456 457 if (Arguments::is_dumping_archive()) { 458 SystemDictionaryShared::init_dumptime_info(this); 459 } 460 461 // Set biased locking bit for all instances of this class; it will be 462 // cleared if revocation occurs too often for this type 463 if (UseBiasedLocking && BiasedLocking::enabled()) { 464 set_prototype_header(markWord::biased_locking_prototype()); 465 } 466 } 467 468 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data, 469 Array<Method*>* methods) { 470 if (methods != NULL && methods != Universe::the_empty_method_array() && 471 !methods->is_shared()) { 472 for (int i = 0; i < methods->length(); i++) { 473 Method* method = methods->at(i); 474 if (method == NULL) continue; // maybe null if error processing 475 // Only want to delete methods that are not executing for RedefineClasses. 476 // The previous version will point to them so they're not totally dangling 477 assert (!method->on_stack(), "shouldn't be called with methods on stack"); 478 MetadataFactory::free_metadata(loader_data, method); 479 } 480 MetadataFactory::free_array<Method*>(loader_data, methods); 481 } 482 } 483 484 void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data, 485 const Klass* super_klass, 486 Array<InstanceKlass*>* local_interfaces, 487 Array<InstanceKlass*>* transitive_interfaces) { 488 // Only deallocate transitive interfaces if not empty, same as super class 489 // or same as local interfaces. See code in parseClassFile. 490 Array<InstanceKlass*>* ti = transitive_interfaces; 491 if (ti != Universe::the_empty_instance_klass_array() && ti != local_interfaces) { 492 // check that the interfaces don't come from super class 493 Array<InstanceKlass*>* sti = (super_klass == NULL) ? NULL : 494 InstanceKlass::cast(super_klass)->transitive_interfaces(); 495 if (ti != sti && ti != NULL && !ti->is_shared()) { 496 MetadataFactory::free_array<InstanceKlass*>(loader_data, ti); 497 } 498 } 499 500 // local interfaces can be empty 501 if (local_interfaces != Universe::the_empty_instance_klass_array() && 502 local_interfaces != NULL && !local_interfaces->is_shared()) { 503 MetadataFactory::free_array<InstanceKlass*>(loader_data, local_interfaces); 504 } 505 } 506 507 // This function deallocates the metadata and C heap pointers that the 508 // InstanceKlass points to. 509 void InstanceKlass::deallocate_contents(ClassLoaderData* loader_data) { 510 511 // Orphan the mirror first, CMS thinks it's still live. 512 if (java_mirror() != NULL) { 513 java_lang_Class::set_klass(java_mirror(), NULL); 514 } 515 516 // Also remove mirror from handles 517 loader_data->remove_handle(_java_mirror); 518 519 // Need to take this class off the class loader data list. 520 loader_data->remove_class(this); 521 522 // The array_klass for this class is created later, after error handling. 523 // For class redefinition, we keep the original class so this scratch class 524 // doesn't have an array class. Either way, assert that there is nothing 525 // to deallocate. 526 assert(array_klasses() == NULL, "array classes shouldn't be created for this class yet"); 527 528 // Release C heap allocated data that this might point to, which includes 529 // reference counting symbol names. 530 release_C_heap_structures(); 531 532 deallocate_methods(loader_data, methods()); 533 set_methods(NULL); 534 535 if (method_ordering() != NULL && 536 method_ordering() != Universe::the_empty_int_array() && 537 !method_ordering()->is_shared()) { 538 MetadataFactory::free_array<int>(loader_data, method_ordering()); 539 } 540 set_method_ordering(NULL); 541 542 // default methods can be empty 543 if (default_methods() != NULL && 544 default_methods() != Universe::the_empty_method_array() && 545 !default_methods()->is_shared()) { 546 MetadataFactory::free_array<Method*>(loader_data, default_methods()); 547 } 548 // Do NOT deallocate the default methods, they are owned by superinterfaces. 549 set_default_methods(NULL); 550 551 // default methods vtable indices can be empty 552 if (default_vtable_indices() != NULL && 553 !default_vtable_indices()->is_shared()) { 554 MetadataFactory::free_array<int>(loader_data, default_vtable_indices()); 555 } 556 set_default_vtable_indices(NULL); 557 558 559 // This array is in Klass, but remove it with the InstanceKlass since 560 // this place would be the only caller and it can share memory with transitive 561 // interfaces. 562 if (secondary_supers() != NULL && 563 secondary_supers() != Universe::the_empty_klass_array() && 564 // see comments in compute_secondary_supers about the following cast 565 (address)(secondary_supers()) != (address)(transitive_interfaces()) && 566 !secondary_supers()->is_shared()) { 567 MetadataFactory::free_array<Klass*>(loader_data, secondary_supers()); 568 } 569 set_secondary_supers(NULL); 570 571 deallocate_interfaces(loader_data, super(), local_interfaces(), transitive_interfaces()); 572 set_transitive_interfaces(NULL); 573 set_local_interfaces(NULL); 574 575 if (fields() != NULL && !fields()->is_shared()) { 576 MetadataFactory::free_array<jushort>(loader_data, fields()); 577 } 578 set_fields(NULL, 0); 579 580 // If a method from a redefined class is using this constant pool, don't 581 // delete it, yet. The new class's previous version will point to this. 582 if (constants() != NULL) { 583 assert (!constants()->on_stack(), "shouldn't be called if anything is onstack"); 584 if (!constants()->is_shared()) { 585 MetadataFactory::free_metadata(loader_data, constants()); 586 } 587 // Delete any cached resolution errors for the constant pool 588 SystemDictionary::delete_resolution_error(constants()); 589 590 set_constants(NULL); 591 } 592 593 if (inner_classes() != NULL && 594 inner_classes() != Universe::the_empty_short_array() && 595 !inner_classes()->is_shared()) { 596 MetadataFactory::free_array<jushort>(loader_data, inner_classes()); 597 } 598 set_inner_classes(NULL); 599 600 if (nest_members() != NULL && 601 nest_members() != Universe::the_empty_short_array() && 602 !nest_members()->is_shared()) { 603 MetadataFactory::free_array<jushort>(loader_data, nest_members()); 604 } 605 set_nest_members(NULL); 606 607 // We should deallocate the Annotations instance if it's not in shared spaces. 608 if (annotations() != NULL && !annotations()->is_shared()) { 609 MetadataFactory::free_metadata(loader_data, annotations()); 610 } 611 set_annotations(NULL); 612 613 if (Arguments::is_dumping_archive()) { 614 SystemDictionaryShared::remove_dumptime_info(this); 615 } 616 } 617 618 bool InstanceKlass::should_be_initialized() const { 619 return !is_initialized(); 620 } 621 622 klassItable InstanceKlass::itable() const { 623 return klassItable(const_cast<InstanceKlass*>(this)); 624 } 625 626 void InstanceKlass::eager_initialize(Thread *thread) { 627 if (!EagerInitialization) return; 628 629 if (this->is_not_initialized()) { 630 // abort if the the class has a class initializer 631 if (this->class_initializer() != NULL) return; 632 633 // abort if it is java.lang.Object (initialization is handled in genesis) 634 Klass* super_klass = super(); 635 if (super_klass == NULL) return; 636 637 // abort if the super class should be initialized 638 if (!InstanceKlass::cast(super_klass)->is_initialized()) return; 639 640 // call body to expose the this pointer 641 eager_initialize_impl(); 642 } 643 } 644 645 // JVMTI spec thinks there are signers and protection domain in the 646 // instanceKlass. These accessors pretend these fields are there. 647 // The hprof specification also thinks these fields are in InstanceKlass. 648 oop InstanceKlass::protection_domain() const { 649 // return the protection_domain from the mirror 650 return java_lang_Class::protection_domain(java_mirror()); 651 } 652 653 // To remove these from requires an incompatible change and CCC request. 654 objArrayOop InstanceKlass::signers() const { 655 // return the signers from the mirror 656 return java_lang_Class::signers(java_mirror()); 657 } 658 659 oop InstanceKlass::init_lock() const { 660 // return the init lock from the mirror 661 oop lock = java_lang_Class::init_lock(java_mirror()); 662 // Prevent reordering with any access of initialization state 663 OrderAccess::loadload(); 664 assert((oop)lock != NULL || !is_not_initialized(), // initialized or in_error state 665 "only fully initialized state can have a null lock"); 666 return lock; 667 } 668 669 // Set the initialization lock to null so the object can be GC'ed. Any racing 670 // threads to get this lock will see a null lock and will not lock. 671 // That's okay because they all check for initialized state after getting 672 // the lock and return. 673 void InstanceKlass::fence_and_clear_init_lock() { 674 // make sure previous stores are all done, notably the init_state. 675 OrderAccess::storestore(); 676 java_lang_Class::set_init_lock(java_mirror(), NULL); 677 assert(!is_not_initialized(), "class must be initialized now"); 678 } 679 680 void InstanceKlass::eager_initialize_impl() { 681 EXCEPTION_MARK; 682 HandleMark hm(THREAD); 683 Handle h_init_lock(THREAD, init_lock()); 684 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL); 685 686 // abort if someone beat us to the initialization 687 if (!is_not_initialized()) return; // note: not equivalent to is_initialized() 688 689 ClassState old_state = init_state(); 690 link_class_impl(THREAD); 691 if (HAS_PENDING_EXCEPTION) { 692 CLEAR_PENDING_EXCEPTION; 693 // Abort if linking the class throws an exception. 694 695 // Use a test to avoid redundantly resetting the state if there's 696 // no change. Set_init_state() asserts that state changes make 697 // progress, whereas here we might just be spinning in place. 698 if (old_state != _init_state) 699 set_init_state(old_state); 700 } else { 701 // linking successfull, mark class as initialized 702 set_init_state(fully_initialized); 703 fence_and_clear_init_lock(); 704 // trace 705 if (log_is_enabled(Info, class, init)) { 706 ResourceMark rm(THREAD); 707 log_info(class, init)("[Initialized %s without side effects]", external_name()); 708 } 709 } 710 } 711 712 713 // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization 714 // process. The step comments refers to the procedure described in that section. 715 // Note: implementation moved to static method to expose the this pointer. 716 void InstanceKlass::initialize(TRAPS) { 717 if (this->should_be_initialized()) { 718 initialize_impl(CHECK); 719 // Note: at this point the class may be initialized 720 // OR it may be in the state of being initialized 721 // in case of recursive initialization! 722 } else { 723 assert(is_initialized(), "sanity check"); 724 } 725 } 726 727 728 bool InstanceKlass::verify_code(TRAPS) { 729 // 1) Verify the bytecodes 730 return Verifier::verify(this, should_verify_class(), THREAD); 731 } 732 733 void InstanceKlass::link_class(TRAPS) { 734 assert(is_loaded(), "must be loaded"); 735 if (!is_linked()) { 736 link_class_impl(CHECK); 737 } 738 } 739 740 // Called to verify that a class can link during initialization, without 741 // throwing a VerifyError. 742 bool InstanceKlass::link_class_or_fail(TRAPS) { 743 assert(is_loaded(), "must be loaded"); 744 if (!is_linked()) { 745 link_class_impl(CHECK_false); 746 } 747 return is_linked(); 748 } 749 750 bool InstanceKlass::link_class_impl(TRAPS) { 751 if (DumpSharedSpaces && is_in_error_state()) { 752 // This is for CDS dumping phase only -- we use the in_error_state to indicate that 753 // the class has failed verification. Throwing the NoClassDefFoundError here is just 754 // a convenient way to stop repeat attempts to verify the same (bad) class. 755 // 756 // Note that the NoClassDefFoundError is not part of the JLS, and should not be thrown 757 // if we are executing Java code. This is not a problem for CDS dumping phase since 758 // it doesn't execute any Java code. 759 ResourceMark rm(THREAD); 760 Exceptions::fthrow(THREAD_AND_LOCATION, 761 vmSymbols::java_lang_NoClassDefFoundError(), 762 "Class %s, or one of its supertypes, failed class initialization", 763 external_name()); 764 return false; 765 } 766 // return if already verified 767 if (is_linked()) { 768 return true; 769 } 770 771 // Timing 772 // timer handles recursion 773 assert(THREAD->is_Java_thread(), "non-JavaThread in link_class_impl"); 774 JavaThread* jt = (JavaThread*)THREAD; 775 776 // link super class before linking this class 777 Klass* super_klass = super(); 778 if (super_klass != NULL) { 779 if (super_klass->is_interface()) { // check if super class is an interface 780 ResourceMark rm(THREAD); 781 Exceptions::fthrow( 782 THREAD_AND_LOCATION, 783 vmSymbols::java_lang_IncompatibleClassChangeError(), 784 "class %s has interface %s as super class", 785 external_name(), 786 super_klass->external_name() 787 ); 788 return false; 789 } 790 791 InstanceKlass* ik_super = InstanceKlass::cast(super_klass); 792 ik_super->link_class_impl(CHECK_false); 793 } 794 795 // link all interfaces implemented by this class before linking this class 796 Array<InstanceKlass*>* interfaces = local_interfaces(); 797 int num_interfaces = interfaces->length(); 798 for (int index = 0; index < num_interfaces; index++) { 799 InstanceKlass* interk = interfaces->at(index); 800 interk->link_class_impl(CHECK_false); 801 } 802 803 // in case the class is linked in the process of linking its superclasses 804 if (is_linked()) { 805 return true; 806 } 807 808 // trace only the link time for this klass that includes 809 // the verification time 810 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(), 811 ClassLoader::perf_class_link_selftime(), 812 ClassLoader::perf_classes_linked(), 813 jt->get_thread_stat()->perf_recursion_counts_addr(), 814 jt->get_thread_stat()->perf_timers_addr(), 815 PerfClassTraceTime::CLASS_LINK); 816 817 // verification & rewriting 818 { 819 HandleMark hm(THREAD); 820 Handle h_init_lock(THREAD, init_lock()); 821 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL); 822 // rewritten will have been set if loader constraint error found 823 // on an earlier link attempt 824 // don't verify or rewrite if already rewritten 825 // 826 827 if (!is_linked()) { 828 if (!is_rewritten()) { 829 { 830 bool verify_ok = verify_code(THREAD); 831 if (!verify_ok) { 832 return false; 833 } 834 } 835 836 // Just in case a side-effect of verify linked this class already 837 // (which can sometimes happen since the verifier loads classes 838 // using custom class loaders, which are free to initialize things) 839 if (is_linked()) { 840 return true; 841 } 842 843 // also sets rewritten 844 rewrite_class(CHECK_false); 845 } else if (is_shared()) { 846 SystemDictionaryShared::check_verification_constraints(this, CHECK_false); 847 } 848 849 // relocate jsrs and link methods after they are all rewritten 850 link_methods(CHECK_false); 851 852 // Initialize the vtable and interface table after 853 // methods have been rewritten since rewrite may 854 // fabricate new Method*s. 855 // also does loader constraint checking 856 // 857 // initialize_vtable and initialize_itable need to be rerun for 858 // a shared class if the class is not loaded by the NULL classloader. 859 ClassLoaderData * loader_data = class_loader_data(); 860 if (!(is_shared() && 861 loader_data->is_the_null_class_loader_data())) { 862 vtable().initialize_vtable(true, CHECK_false); 863 itable().initialize_itable(true, CHECK_false); 864 } 865 #ifdef ASSERT 866 else { 867 vtable().verify(tty, true); 868 // In case itable verification is ever added. 869 // itable().verify(tty, true); 870 } 871 #endif 872 set_init_state(linked); 873 if (JvmtiExport::should_post_class_prepare()) { 874 Thread *thread = THREAD; 875 assert(thread->is_Java_thread(), "thread->is_Java_thread()"); 876 JvmtiExport::post_class_prepare((JavaThread *) thread, this); 877 } 878 } 879 } 880 return true; 881 } 882 883 // Rewrite the byte codes of all of the methods of a class. 884 // The rewriter must be called exactly once. Rewriting must happen after 885 // verification but before the first method of the class is executed. 886 void InstanceKlass::rewrite_class(TRAPS) { 887 assert(is_loaded(), "must be loaded"); 888 if (is_rewritten()) { 889 assert(is_shared(), "rewriting an unshared class?"); 890 return; 891 } 892 Rewriter::rewrite(this, CHECK); 893 set_rewritten(); 894 } 895 896 // Now relocate and link method entry points after class is rewritten. 897 // This is outside is_rewritten flag. In case of an exception, it can be 898 // executed more than once. 899 void InstanceKlass::link_methods(TRAPS) { 900 int len = methods()->length(); 901 for (int i = len-1; i >= 0; i--) { 902 methodHandle m(THREAD, methods()->at(i)); 903 904 // Set up method entry points for compiler and interpreter . 905 m->link_method(m, CHECK); 906 } 907 } 908 909 // Eagerly initialize superinterfaces that declare default methods (concrete instance: any access) 910 void InstanceKlass::initialize_super_interfaces(TRAPS) { 911 assert (has_nonstatic_concrete_methods(), "caller should have checked this"); 912 for (int i = 0; i < local_interfaces()->length(); ++i) { 913 InstanceKlass* ik = local_interfaces()->at(i); 914 915 // Initialization is depth first search ie. we start with top of the inheritance tree 916 // has_nonstatic_concrete_methods drives searching superinterfaces since it 917 // means has_nonstatic_concrete_methods in its superinterface hierarchy 918 if (ik->has_nonstatic_concrete_methods()) { 919 ik->initialize_super_interfaces(CHECK); 920 } 921 922 // Only initialize() interfaces that "declare" concrete methods. 923 if (ik->should_be_initialized() && ik->declares_nonstatic_concrete_methods()) { 924 ik->initialize(CHECK); 925 } 926 } 927 } 928 929 void InstanceKlass::initialize_impl(TRAPS) { 930 HandleMark hm(THREAD); 931 932 // Make sure klass is linked (verified) before initialization 933 // A class could already be verified, since it has been reflected upon. 934 link_class(CHECK); 935 936 DTRACE_CLASSINIT_PROBE(required, -1); 937 938 bool wait = false; 939 940 assert(THREAD->is_Java_thread(), "non-JavaThread in initialize_impl"); 941 JavaThread* jt = (JavaThread*)THREAD; 942 943 // refer to the JVM book page 47 for description of steps 944 // Step 1 945 { 946 Handle h_init_lock(THREAD, init_lock()); 947 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL); 948 949 // Step 2 950 // If we were to use wait() instead of waitInterruptibly() then 951 // we might end up throwing IE from link/symbol resolution sites 952 // that aren't expected to throw. This would wreak havoc. See 6320309. 953 while (is_being_initialized() && !is_reentrant_initialization(jt)) { 954 wait = true; 955 jt->set_class_to_be_initialized(this); 956 ol.wait_uninterruptibly(jt); 957 jt->set_class_to_be_initialized(NULL); 958 } 959 960 // Step 3 961 if (is_being_initialized() && is_reentrant_initialization(jt)) { 962 DTRACE_CLASSINIT_PROBE_WAIT(recursive, -1, wait); 963 return; 964 } 965 966 // Step 4 967 if (is_initialized()) { 968 DTRACE_CLASSINIT_PROBE_WAIT(concurrent, -1, wait); 969 return; 970 } 971 972 // Step 5 973 if (is_in_error_state()) { 974 DTRACE_CLASSINIT_PROBE_WAIT(erroneous, -1, wait); 975 ResourceMark rm(THREAD); 976 const char* desc = "Could not initialize class "; 977 const char* className = external_name(); 978 size_t msglen = strlen(desc) + strlen(className) + 1; 979 char* message = NEW_RESOURCE_ARRAY(char, msglen); 980 if (NULL == message) { 981 // Out of memory: can't create detailed error message 982 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className); 983 } else { 984 jio_snprintf(message, msglen, "%s%s", desc, className); 985 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message); 986 } 987 } 988 989 // Step 6 990 set_init_state(being_initialized); 991 set_init_thread(jt); 992 } 993 994 // Step 7 995 // Next, if C is a class rather than an interface, initialize it's super class and super 996 // interfaces. 997 if (!is_interface()) { 998 Klass* super_klass = super(); 999 if (super_klass != NULL && super_klass->should_be_initialized()) { 1000 super_klass->initialize(THREAD); 1001 } 1002 // If C implements any interface that declares a non-static, concrete method, 1003 // the initialization of C triggers initialization of its super interfaces. 1004 // Only need to recurse if has_nonstatic_concrete_methods which includes declaring and 1005 // having a superinterface that declares, non-static, concrete methods 1006 if (!HAS_PENDING_EXCEPTION && has_nonstatic_concrete_methods()) { 1007 initialize_super_interfaces(THREAD); 1008 } 1009 1010 // If any exceptions, complete abruptly, throwing the same exception as above. 1011 if (HAS_PENDING_EXCEPTION) { 1012 Handle e(THREAD, PENDING_EXCEPTION); 1013 CLEAR_PENDING_EXCEPTION; 1014 { 1015 EXCEPTION_MARK; 1016 // Locks object, set state, and notify all waiting threads 1017 set_initialization_state_and_notify(initialization_error, THREAD); 1018 CLEAR_PENDING_EXCEPTION; 1019 } 1020 DTRACE_CLASSINIT_PROBE_WAIT(super__failed, -1, wait); 1021 THROW_OOP(e()); 1022 } 1023 } 1024 1025 1026 // Look for aot compiled methods for this klass, including class initializer. 1027 AOTLoader::load_for_klass(this, THREAD); 1028 1029 // Step 8 1030 { 1031 DTRACE_CLASSINIT_PROBE_WAIT(clinit, -1, wait); 1032 // Timer includes any side effects of class initialization (resolution, 1033 // etc), but not recursive entry into call_class_initializer(). 1034 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(), 1035 ClassLoader::perf_class_init_selftime(), 1036 ClassLoader::perf_classes_inited(), 1037 jt->get_thread_stat()->perf_recursion_counts_addr(), 1038 jt->get_thread_stat()->perf_timers_addr(), 1039 PerfClassTraceTime::CLASS_CLINIT); 1040 call_class_initializer(THREAD); 1041 } 1042 1043 // Step 9 1044 if (!HAS_PENDING_EXCEPTION) { 1045 set_initialization_state_and_notify(fully_initialized, CHECK); 1046 { 1047 debug_only(vtable().verify(tty, true);) 1048 } 1049 } 1050 else { 1051 // Step 10 and 11 1052 Handle e(THREAD, PENDING_EXCEPTION); 1053 CLEAR_PENDING_EXCEPTION; 1054 // JVMTI has already reported the pending exception 1055 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError 1056 JvmtiExport::clear_detected_exception(jt); 1057 { 1058 EXCEPTION_MARK; 1059 set_initialization_state_and_notify(initialization_error, THREAD); 1060 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below 1061 // JVMTI has already reported the pending exception 1062 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError 1063 JvmtiExport::clear_detected_exception(jt); 1064 } 1065 DTRACE_CLASSINIT_PROBE_WAIT(error, -1, wait); 1066 if (e->is_a(SystemDictionary::Error_klass())) { 1067 THROW_OOP(e()); 1068 } else { 1069 JavaCallArguments args(e); 1070 THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(), 1071 vmSymbols::throwable_void_signature(), 1072 &args); 1073 } 1074 } 1075 DTRACE_CLASSINIT_PROBE_WAIT(end, -1, wait); 1076 } 1077 1078 1079 void InstanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) { 1080 Handle h_init_lock(THREAD, init_lock()); 1081 if (h_init_lock() != NULL) { 1082 ObjectLocker ol(h_init_lock, THREAD); 1083 set_init_thread(NULL); // reset _init_thread before changing _init_state 1084 set_init_state(state); 1085 fence_and_clear_init_lock(); 1086 ol.notify_all(CHECK); 1087 } else { 1088 assert(h_init_lock() != NULL, "The initialization state should never be set twice"); 1089 set_init_thread(NULL); // reset _init_thread before changing _init_state 1090 set_init_state(state); 1091 } 1092 } 1093 1094 Klass* InstanceKlass::implementor() const { 1095 Klass* volatile* k = adr_implementor(); 1096 if (k == NULL) { 1097 return NULL; 1098 } else { 1099 // This load races with inserts, and therefore needs acquire. 1100 Klass* kls = Atomic::load_acquire(k); 1101 if (kls != NULL && !kls->is_loader_alive()) { 1102 return NULL; // don't return unloaded class 1103 } else { 1104 return kls; 1105 } 1106 } 1107 } 1108 1109 1110 void InstanceKlass::set_implementor(Klass* k) { 1111 assert_locked_or_safepoint(Compile_lock); 1112 assert(is_interface(), "not interface"); 1113 Klass* volatile* addr = adr_implementor(); 1114 assert(addr != NULL, "null addr"); 1115 if (addr != NULL) { 1116 Atomic::release_store(addr, k); 1117 } 1118 } 1119 1120 int InstanceKlass::nof_implementors() const { 1121 Klass* k = implementor(); 1122 if (k == NULL) { 1123 return 0; 1124 } else if (k != this) { 1125 return 1; 1126 } else { 1127 return 2; 1128 } 1129 } 1130 1131 // The embedded _implementor field can only record one implementor. 1132 // When there are more than one implementors, the _implementor field 1133 // is set to the interface Klass* itself. Following are the possible 1134 // values for the _implementor field: 1135 // NULL - no implementor 1136 // implementor Klass* - one implementor 1137 // self - more than one implementor 1138 // 1139 // The _implementor field only exists for interfaces. 1140 void InstanceKlass::add_implementor(Klass* k) { 1141 assert_lock_strong(Compile_lock); 1142 assert(is_interface(), "not interface"); 1143 // Filter out my subinterfaces. 1144 // (Note: Interfaces are never on the subklass list.) 1145 if (InstanceKlass::cast(k)->is_interface()) return; 1146 1147 // Filter out subclasses whose supers already implement me. 1148 // (Note: CHA must walk subclasses of direct implementors 1149 // in order to locate indirect implementors.) 1150 Klass* sk = k->super(); 1151 if (sk != NULL && InstanceKlass::cast(sk)->implements_interface(this)) 1152 // We only need to check one immediate superclass, since the 1153 // implements_interface query looks at transitive_interfaces. 1154 // Any supers of the super have the same (or fewer) transitive_interfaces. 1155 return; 1156 1157 Klass* ik = implementor(); 1158 if (ik == NULL) { 1159 set_implementor(k); 1160 } else if (ik != this) { 1161 // There is already an implementor. Use itself as an indicator of 1162 // more than one implementors. 1163 set_implementor(this); 1164 } 1165 1166 // The implementor also implements the transitive_interfaces 1167 for (int index = 0; index < local_interfaces()->length(); index++) { 1168 InstanceKlass::cast(local_interfaces()->at(index))->add_implementor(k); 1169 } 1170 } 1171 1172 void InstanceKlass::init_implementor() { 1173 if (is_interface()) { 1174 set_implementor(NULL); 1175 } 1176 } 1177 1178 1179 void InstanceKlass::process_interfaces(Thread *thread) { 1180 // link this class into the implementors list of every interface it implements 1181 for (int i = local_interfaces()->length() - 1; i >= 0; i--) { 1182 assert(local_interfaces()->at(i)->is_klass(), "must be a klass"); 1183 InstanceKlass* interf = InstanceKlass::cast(local_interfaces()->at(i)); 1184 assert(interf->is_interface(), "expected interface"); 1185 interf->add_implementor(this); 1186 } 1187 } 1188 1189 bool InstanceKlass::can_be_primary_super_slow() const { 1190 if (is_interface()) 1191 return false; 1192 else 1193 return Klass::can_be_primary_super_slow(); 1194 } 1195 1196 GrowableArray<Klass*>* InstanceKlass::compute_secondary_supers(int num_extra_slots, 1197 Array<InstanceKlass*>* transitive_interfaces) { 1198 // The secondaries are the implemented interfaces. 1199 Array<InstanceKlass*>* interfaces = transitive_interfaces; 1200 int num_secondaries = num_extra_slots + interfaces->length(); 1201 if (num_secondaries == 0) { 1202 // Must share this for correct bootstrapping! 1203 set_secondary_supers(Universe::the_empty_klass_array()); 1204 return NULL; 1205 } else if (num_extra_slots == 0) { 1206 // The secondary super list is exactly the same as the transitive interfaces, so 1207 // let's use it instead of making a copy. 1208 // Redefine classes has to be careful not to delete this! 1209 // We need the cast because Array<Klass*> is NOT a supertype of Array<InstanceKlass*>, 1210 // (but it's safe to do here because we won't write into _secondary_supers from this point on). 1211 set_secondary_supers((Array<Klass*>*)(address)interfaces); 1212 return NULL; 1213 } else { 1214 // Copy transitive interfaces to a temporary growable array to be constructed 1215 // into the secondary super list with extra slots. 1216 GrowableArray<Klass*>* secondaries = new GrowableArray<Klass*>(interfaces->length()); 1217 for (int i = 0; i < interfaces->length(); i++) { 1218 secondaries->push(interfaces->at(i)); 1219 } 1220 return secondaries; 1221 } 1222 } 1223 1224 bool InstanceKlass::implements_interface(Klass* k) const { 1225 if (this == k) return true; 1226 assert(k->is_interface(), "should be an interface class"); 1227 for (int i = 0; i < transitive_interfaces()->length(); i++) { 1228 if (transitive_interfaces()->at(i) == k) { 1229 return true; 1230 } 1231 } 1232 return false; 1233 } 1234 1235 bool InstanceKlass::is_same_or_direct_interface(Klass *k) const { 1236 // Verify direct super interface 1237 if (this == k) return true; 1238 assert(k->is_interface(), "should be an interface class"); 1239 for (int i = 0; i < local_interfaces()->length(); i++) { 1240 if (local_interfaces()->at(i) == k) { 1241 return true; 1242 } 1243 } 1244 return false; 1245 } 1246 1247 objArrayOop InstanceKlass::allocate_objArray(int n, int length, TRAPS) { 1248 check_array_allocation_length(length, arrayOopDesc::max_array_length(T_OBJECT), CHECK_NULL); 1249 int size = objArrayOopDesc::object_size(length); 1250 Klass* ak = array_klass(n, CHECK_NULL); 1251 objArrayOop o = (objArrayOop)Universe::heap()->array_allocate(ak, size, length, 1252 /* do_zero */ true, CHECK_NULL); 1253 return o; 1254 } 1255 1256 instanceOop InstanceKlass::register_finalizer(instanceOop i, TRAPS) { 1257 if (TraceFinalizerRegistration) { 1258 tty->print("Registered "); 1259 i->print_value_on(tty); 1260 tty->print_cr(" (" INTPTR_FORMAT ") as finalizable", p2i(i)); 1261 } 1262 instanceHandle h_i(THREAD, i); 1263 // Pass the handle as argument, JavaCalls::call expects oop as jobjects 1264 JavaValue result(T_VOID); 1265 JavaCallArguments args(h_i); 1266 methodHandle mh (THREAD, Universe::finalizer_register_method()); 1267 JavaCalls::call(&result, mh, &args, CHECK_NULL); 1268 return h_i(); 1269 } 1270 1271 instanceOop InstanceKlass::allocate_instance(TRAPS) { 1272 bool has_finalizer_flag = has_finalizer(); // Query before possible GC 1273 int size = size_helper(); // Query before forming handle. 1274 1275 instanceOop i; 1276 1277 i = (instanceOop)Universe::heap()->obj_allocate(this, size, CHECK_NULL); 1278 if (has_finalizer_flag && !RegisterFinalizersAtInit) { 1279 i = register_finalizer(i, CHECK_NULL); 1280 } 1281 return i; 1282 } 1283 1284 instanceHandle InstanceKlass::allocate_instance_handle(TRAPS) { 1285 return instanceHandle(THREAD, allocate_instance(THREAD)); 1286 } 1287 1288 void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) { 1289 if (is_interface() || is_abstract()) { 1290 ResourceMark rm(THREAD); 1291 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError() 1292 : vmSymbols::java_lang_InstantiationException(), external_name()); 1293 } 1294 if (this == SystemDictionary::Class_klass()) { 1295 ResourceMark rm(THREAD); 1296 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError() 1297 : vmSymbols::java_lang_IllegalAccessException(), external_name()); 1298 } 1299 } 1300 1301 Klass* InstanceKlass::array_klass_impl(bool or_null, int n, TRAPS) { 1302 // Need load-acquire for lock-free read 1303 if (array_klasses_acquire() == NULL) { 1304 if (or_null) return NULL; 1305 1306 ResourceMark rm; 1307 JavaThread *jt = (JavaThread *)THREAD; 1308 { 1309 // Atomic creation of array_klasses 1310 MutexLocker ma(MultiArray_lock, THREAD); 1311 1312 // Check if update has already taken place 1313 if (array_klasses() == NULL) { 1314 Klass* k = ObjArrayKlass::allocate_objArray_klass(class_loader_data(), 1, this, CHECK_NULL); 1315 // use 'release' to pair with lock-free load 1316 release_set_array_klasses(k); 1317 } 1318 } 1319 } 1320 // _this will always be set at this point 1321 ObjArrayKlass* oak = (ObjArrayKlass*)array_klasses(); 1322 if (or_null) { 1323 return oak->array_klass_or_null(n); 1324 } 1325 return oak->array_klass(n, THREAD); 1326 } 1327 1328 Klass* InstanceKlass::array_klass_impl(bool or_null, TRAPS) { 1329 return array_klass_impl(or_null, 1, THREAD); 1330 } 1331 1332 static int call_class_initializer_counter = 0; // for debugging 1333 1334 Method* InstanceKlass::class_initializer() const { 1335 Method* clinit = find_method( 1336 vmSymbols::class_initializer_name(), vmSymbols::void_method_signature()); 1337 if (clinit != NULL && clinit->has_valid_initializer_flags()) { 1338 return clinit; 1339 } 1340 return NULL; 1341 } 1342 1343 void InstanceKlass::call_class_initializer(TRAPS) { 1344 if (ReplayCompiles && 1345 (ReplaySuppressInitializers == 1 || 1346 (ReplaySuppressInitializers >= 2 && class_loader() != NULL))) { 1347 // Hide the existence of the initializer for the purpose of replaying the compile 1348 return; 1349 } 1350 1351 methodHandle h_method(THREAD, class_initializer()); 1352 assert(!is_initialized(), "we cannot initialize twice"); 1353 LogTarget(Info, class, init) lt; 1354 if (lt.is_enabled()) { 1355 ResourceMark rm; 1356 LogStream ls(lt); 1357 ls.print("%d Initializing ", call_class_initializer_counter++); 1358 name()->print_value_on(&ls); 1359 ls.print_cr("%s (" INTPTR_FORMAT ")", h_method() == NULL ? "(no method)" : "", p2i(this)); 1360 } 1361 if (h_method() != NULL) { 1362 JavaCallArguments args; // No arguments 1363 JavaValue result(T_VOID); 1364 JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args) 1365 } 1366 } 1367 1368 1369 void InstanceKlass::mask_for(const methodHandle& method, int bci, 1370 InterpreterOopMap* entry_for) { 1371 // Lazily create the _oop_map_cache at first request 1372 // Lock-free access requires load_acquire. 1373 OopMapCache* oop_map_cache = Atomic::load_acquire(&_oop_map_cache); 1374 if (oop_map_cache == NULL) { 1375 MutexLocker x(OopMapCacheAlloc_lock); 1376 // Check if _oop_map_cache was allocated while we were waiting for this lock 1377 if ((oop_map_cache = _oop_map_cache) == NULL) { 1378 oop_map_cache = new OopMapCache(); 1379 // Ensure _oop_map_cache is stable, since it is examined without a lock 1380 Atomic::release_store(&_oop_map_cache, oop_map_cache); 1381 } 1382 } 1383 // _oop_map_cache is constant after init; lookup below does its own locking. 1384 oop_map_cache->lookup(method, bci, entry_for); 1385 } 1386 1387 1388 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { 1389 for (JavaFieldStream fs(this); !fs.done(); fs.next()) { 1390 Symbol* f_name = fs.name(); 1391 Symbol* f_sig = fs.signature(); 1392 if (f_name == name && f_sig == sig) { 1393 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index()); 1394 return true; 1395 } 1396 } 1397 return false; 1398 } 1399 1400 1401 Klass* InstanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { 1402 const int n = local_interfaces()->length(); 1403 for (int i = 0; i < n; i++) { 1404 Klass* intf1 = local_interfaces()->at(i); 1405 assert(intf1->is_interface(), "just checking type"); 1406 // search for field in current interface 1407 if (InstanceKlass::cast(intf1)->find_local_field(name, sig, fd)) { 1408 assert(fd->is_static(), "interface field must be static"); 1409 return intf1; 1410 } 1411 // search for field in direct superinterfaces 1412 Klass* intf2 = InstanceKlass::cast(intf1)->find_interface_field(name, sig, fd); 1413 if (intf2 != NULL) return intf2; 1414 } 1415 // otherwise field lookup fails 1416 return NULL; 1417 } 1418 1419 1420 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { 1421 // search order according to newest JVM spec (5.4.3.2, p.167). 1422 // 1) search for field in current klass 1423 if (find_local_field(name, sig, fd)) { 1424 return const_cast<InstanceKlass*>(this); 1425 } 1426 // 2) search for field recursively in direct superinterfaces 1427 { Klass* intf = find_interface_field(name, sig, fd); 1428 if (intf != NULL) return intf; 1429 } 1430 // 3) apply field lookup recursively if superclass exists 1431 { Klass* supr = super(); 1432 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, fd); 1433 } 1434 // 4) otherwise field lookup fails 1435 return NULL; 1436 } 1437 1438 1439 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const { 1440 // search order according to newest JVM spec (5.4.3.2, p.167). 1441 // 1) search for field in current klass 1442 if (find_local_field(name, sig, fd)) { 1443 if (fd->is_static() == is_static) return const_cast<InstanceKlass*>(this); 1444 } 1445 // 2) search for field recursively in direct superinterfaces 1446 if (is_static) { 1447 Klass* intf = find_interface_field(name, sig, fd); 1448 if (intf != NULL) return intf; 1449 } 1450 // 3) apply field lookup recursively if superclass exists 1451 { Klass* supr = super(); 1452 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, is_static, fd); 1453 } 1454 // 4) otherwise field lookup fails 1455 return NULL; 1456 } 1457 1458 1459 bool InstanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const { 1460 for (JavaFieldStream fs(this); !fs.done(); fs.next()) { 1461 if (fs.offset() == offset) { 1462 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index()); 1463 if (fd->is_static() == is_static) return true; 1464 } 1465 } 1466 return false; 1467 } 1468 1469 1470 bool InstanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const { 1471 Klass* klass = const_cast<InstanceKlass*>(this); 1472 while (klass != NULL) { 1473 if (InstanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) { 1474 return true; 1475 } 1476 klass = klass->super(); 1477 } 1478 return false; 1479 } 1480 1481 1482 void InstanceKlass::methods_do(void f(Method* method)) { 1483 // Methods aren't stable until they are loaded. This can be read outside 1484 // a lock through the ClassLoaderData for profiling 1485 if (!is_loaded()) { 1486 return; 1487 } 1488 1489 int len = methods()->length(); 1490 for (int index = 0; index < len; index++) { 1491 Method* m = methods()->at(index); 1492 assert(m->is_method(), "must be method"); 1493 f(m); 1494 } 1495 } 1496 1497 1498 void InstanceKlass::do_local_static_fields(FieldClosure* cl) { 1499 for (JavaFieldStream fs(this); !fs.done(); fs.next()) { 1500 if (fs.access_flags().is_static()) { 1501 fieldDescriptor& fd = fs.field_descriptor(); 1502 cl->do_field(&fd); 1503 } 1504 } 1505 } 1506 1507 1508 void InstanceKlass::do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle mirror, TRAPS) { 1509 for (JavaFieldStream fs(this); !fs.done(); fs.next()) { 1510 if (fs.access_flags().is_static()) { 1511 fieldDescriptor& fd = fs.field_descriptor(); 1512 f(&fd, mirror, CHECK); 1513 } 1514 } 1515 } 1516 1517 1518 static int compare_fields_by_offset(int* a, int* b) { 1519 return a[0] - b[0]; 1520 } 1521 1522 void InstanceKlass::do_nonstatic_fields(FieldClosure* cl) { 1523 InstanceKlass* super = superklass(); 1524 if (super != NULL) { 1525 super->do_nonstatic_fields(cl); 1526 } 1527 fieldDescriptor fd; 1528 int length = java_fields_count(); 1529 // In DebugInfo nonstatic fields are sorted by offset. 1530 int* fields_sorted = NEW_C_HEAP_ARRAY(int, 2*(length+1), mtClass); 1531 int j = 0; 1532 for (int i = 0; i < length; i += 1) { 1533 fd.reinitialize(this, i); 1534 if (!fd.is_static()) { 1535 fields_sorted[j + 0] = fd.offset(); 1536 fields_sorted[j + 1] = i; 1537 j += 2; 1538 } 1539 } 1540 if (j > 0) { 1541 length = j; 1542 // _sort_Fn is defined in growableArray.hpp. 1543 qsort(fields_sorted, length/2, 2*sizeof(int), (_sort_Fn)compare_fields_by_offset); 1544 for (int i = 0; i < length; i += 2) { 1545 fd.reinitialize(this, fields_sorted[i + 1]); 1546 assert(!fd.is_static() && fd.offset() == fields_sorted[i], "only nonstatic fields"); 1547 cl->do_field(&fd); 1548 } 1549 } 1550 FREE_C_HEAP_ARRAY(int, fields_sorted); 1551 } 1552 1553 1554 void InstanceKlass::array_klasses_do(void f(Klass* k, TRAPS), TRAPS) { 1555 if (array_klasses() != NULL) 1556 ArrayKlass::cast(array_klasses())->array_klasses_do(f, THREAD); 1557 } 1558 1559 void InstanceKlass::array_klasses_do(void f(Klass* k)) { 1560 if (array_klasses() != NULL) 1561 ArrayKlass::cast(array_klasses())->array_klasses_do(f); 1562 } 1563 1564 #ifdef ASSERT 1565 static int linear_search(const Array<Method*>* methods, 1566 const Symbol* name, 1567 const Symbol* signature) { 1568 const int len = methods->length(); 1569 for (int index = 0; index < len; index++) { 1570 const Method* const m = methods->at(index); 1571 assert(m->is_method(), "must be method"); 1572 if (m->signature() == signature && m->name() == name) { 1573 return index; 1574 } 1575 } 1576 return -1; 1577 } 1578 #endif 1579 1580 bool InstanceKlass::_disable_method_binary_search = false; 1581 1582 int InstanceKlass::quick_search(const Array<Method*>* methods, const Symbol* name) { 1583 int len = methods->length(); 1584 int l = 0; 1585 int h = len - 1; 1586 1587 if (_disable_method_binary_search) { 1588 // At the final stage of dynamic dumping, the methods array may not be sorted 1589 // by ascending addresses of their names, so we can't use binary search anymore. 1590 // However, methods with the same name are still laid out consecutively inside the 1591 // methods array, so let's look for the first one that matches. 1592 assert(DynamicDumpSharedSpaces, "must be"); 1593 while (l <= h) { 1594 Method* m = methods->at(l); 1595 if (m->name() == name) { 1596 return l; 1597 } 1598 l ++; 1599 } 1600 return -1; 1601 } 1602 1603 // methods are sorted by ascending addresses of their names, so do binary search 1604 while (l <= h) { 1605 int mid = (l + h) >> 1; 1606 Method* m = methods->at(mid); 1607 assert(m->is_method(), "must be method"); 1608 int res = m->name()->fast_compare(name); 1609 if (res == 0) { 1610 return mid; 1611 } else if (res < 0) { 1612 l = mid + 1; 1613 } else { 1614 h = mid - 1; 1615 } 1616 } 1617 return -1; 1618 } 1619 1620 // find_method looks up the name/signature in the local methods array 1621 Method* InstanceKlass::find_method(const Symbol* name, 1622 const Symbol* signature) const { 1623 return find_method_impl(name, signature, find_overpass, find_static, find_private); 1624 } 1625 1626 Method* InstanceKlass::find_method_impl(const Symbol* name, 1627 const Symbol* signature, 1628 OverpassLookupMode overpass_mode, 1629 StaticLookupMode static_mode, 1630 PrivateLookupMode private_mode) const { 1631 return InstanceKlass::find_method_impl(methods(), 1632 name, 1633 signature, 1634 overpass_mode, 1635 static_mode, 1636 private_mode); 1637 } 1638 1639 // find_instance_method looks up the name/signature in the local methods array 1640 // and skips over static methods 1641 Method* InstanceKlass::find_instance_method(const Array<Method*>* methods, 1642 const Symbol* name, 1643 const Symbol* signature, 1644 PrivateLookupMode private_mode) { 1645 Method* const meth = InstanceKlass::find_method_impl(methods, 1646 name, 1647 signature, 1648 find_overpass, 1649 skip_static, 1650 private_mode); 1651 assert(((meth == NULL) || !meth->is_static()), 1652 "find_instance_method should have skipped statics"); 1653 return meth; 1654 } 1655 1656 // find_instance_method looks up the name/signature in the local methods array 1657 // and skips over static methods 1658 Method* InstanceKlass::find_instance_method(const Symbol* name, 1659 const Symbol* signature, 1660 PrivateLookupMode private_mode) const { 1661 return InstanceKlass::find_instance_method(methods(), name, signature, private_mode); 1662 } 1663 1664 // Find looks up the name/signature in the local methods array 1665 // and filters on the overpass, static and private flags 1666 // This returns the first one found 1667 // note that the local methods array can have up to one overpass, one static 1668 // and one instance (private or not) with the same name/signature 1669 Method* InstanceKlass::find_local_method(const Symbol* name, 1670 const Symbol* signature, 1671 OverpassLookupMode overpass_mode, 1672 StaticLookupMode static_mode, 1673 PrivateLookupMode private_mode) const { 1674 return InstanceKlass::find_method_impl(methods(), 1675 name, 1676 signature, 1677 overpass_mode, 1678 static_mode, 1679 private_mode); 1680 } 1681 1682 // Find looks up the name/signature in the local methods array 1683 // and filters on the overpass, static and private flags 1684 // This returns the first one found 1685 // note that the local methods array can have up to one overpass, one static 1686 // and one instance (private or not) with the same name/signature 1687 Method* InstanceKlass::find_local_method(const Array<Method*>* methods, 1688 const Symbol* name, 1689 const Symbol* signature, 1690 OverpassLookupMode overpass_mode, 1691 StaticLookupMode static_mode, 1692 PrivateLookupMode private_mode) { 1693 return InstanceKlass::find_method_impl(methods, 1694 name, 1695 signature, 1696 overpass_mode, 1697 static_mode, 1698 private_mode); 1699 } 1700 1701 Method* InstanceKlass::find_method(const Array<Method*>* methods, 1702 const Symbol* name, 1703 const Symbol* signature) { 1704 return InstanceKlass::find_method_impl(methods, 1705 name, 1706 signature, 1707 find_overpass, 1708 find_static, 1709 find_private); 1710 } 1711 1712 Method* InstanceKlass::find_method_impl(const Array<Method*>* methods, 1713 const Symbol* name, 1714 const Symbol* signature, 1715 OverpassLookupMode overpass_mode, 1716 StaticLookupMode static_mode, 1717 PrivateLookupMode private_mode) { 1718 int hit = find_method_index(methods, name, signature, overpass_mode, static_mode, private_mode); 1719 return hit >= 0 ? methods->at(hit): NULL; 1720 } 1721 1722 // true if method matches signature and conforms to skipping_X conditions. 1723 static bool method_matches(const Method* m, 1724 const Symbol* signature, 1725 bool skipping_overpass, 1726 bool skipping_static, 1727 bool skipping_private) { 1728 return ((m->signature() == signature) && 1729 (!skipping_overpass || !m->is_overpass()) && 1730 (!skipping_static || !m->is_static()) && 1731 (!skipping_private || !m->is_private())); 1732 } 1733 1734 // Used directly for default_methods to find the index into the 1735 // default_vtable_indices, and indirectly by find_method 1736 // find_method_index looks in the local methods array to return the index 1737 // of the matching name/signature. If, overpass methods are being ignored, 1738 // the search continues to find a potential non-overpass match. This capability 1739 // is important during method resolution to prefer a static method, for example, 1740 // over an overpass method. 1741 // There is the possibility in any _method's array to have the same name/signature 1742 // for a static method, an overpass method and a local instance method 1743 // To correctly catch a given method, the search criteria may need 1744 // to explicitly skip the other two. For local instance methods, it 1745 // is often necessary to skip private methods 1746 int InstanceKlass::find_method_index(const Array<Method*>* methods, 1747 const Symbol* name, 1748 const Symbol* signature, 1749 OverpassLookupMode overpass_mode, 1750 StaticLookupMode static_mode, 1751 PrivateLookupMode private_mode) { 1752 const bool skipping_overpass = (overpass_mode == skip_overpass); 1753 const bool skipping_static = (static_mode == skip_static); 1754 const bool skipping_private = (private_mode == skip_private); 1755 const int hit = quick_search(methods, name); 1756 if (hit != -1) { 1757 const Method* const m = methods->at(hit); 1758 1759 // Do linear search to find matching signature. First, quick check 1760 // for common case, ignoring overpasses if requested. 1761 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) { 1762 return hit; 1763 } 1764 1765 // search downwards through overloaded methods 1766 int i; 1767 for (i = hit - 1; i >= 0; --i) { 1768 const Method* const m = methods->at(i); 1769 assert(m->is_method(), "must be method"); 1770 if (m->name() != name) { 1771 break; 1772 } 1773 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) { 1774 return i; 1775 } 1776 } 1777 // search upwards 1778 for (i = hit + 1; i < methods->length(); ++i) { 1779 const Method* const m = methods->at(i); 1780 assert(m->is_method(), "must be method"); 1781 if (m->name() != name) { 1782 break; 1783 } 1784 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) { 1785 return i; 1786 } 1787 } 1788 // not found 1789 #ifdef ASSERT 1790 const int index = (skipping_overpass || skipping_static || skipping_private) ? -1 : 1791 linear_search(methods, name, signature); 1792 assert(-1 == index, "binary search should have found entry %d", index); 1793 #endif 1794 } 1795 return -1; 1796 } 1797 1798 int InstanceKlass::find_method_by_name(const Symbol* name, int* end) const { 1799 return find_method_by_name(methods(), name, end); 1800 } 1801 1802 int InstanceKlass::find_method_by_name(const Array<Method*>* methods, 1803 const Symbol* name, 1804 int* end_ptr) { 1805 assert(end_ptr != NULL, "just checking"); 1806 int start = quick_search(methods, name); 1807 int end = start + 1; 1808 if (start != -1) { 1809 while (start - 1 >= 0 && (methods->at(start - 1))->name() == name) --start; 1810 while (end < methods->length() && (methods->at(end))->name() == name) ++end; 1811 *end_ptr = end; 1812 return start; 1813 } 1814 return -1; 1815 } 1816 1817 // uncached_lookup_method searches both the local class methods array and all 1818 // superclasses methods arrays, skipping any overpass methods in superclasses, 1819 // and possibly skipping private methods. 1820 Method* InstanceKlass::uncached_lookup_method(const Symbol* name, 1821 const Symbol* signature, 1822 OverpassLookupMode overpass_mode, 1823 PrivateLookupMode private_mode) const { 1824 OverpassLookupMode overpass_local_mode = overpass_mode; 1825 const Klass* klass = this; 1826 while (klass != NULL) { 1827 Method* const method = InstanceKlass::cast(klass)->find_method_impl(name, 1828 signature, 1829 overpass_local_mode, 1830 find_static, 1831 private_mode); 1832 if (method != NULL) { 1833 return method; 1834 } 1835 klass = klass->super(); 1836 overpass_local_mode = skip_overpass; // Always ignore overpass methods in superclasses 1837 } 1838 return NULL; 1839 } 1840 1841 #ifdef ASSERT 1842 // search through class hierarchy and return true if this class or 1843 // one of the superclasses was redefined 1844 bool InstanceKlass::has_redefined_this_or_super() const { 1845 const Klass* klass = this; 1846 while (klass != NULL) { 1847 if (InstanceKlass::cast(klass)->has_been_redefined()) { 1848 return true; 1849 } 1850 klass = klass->super(); 1851 } 1852 return false; 1853 } 1854 #endif 1855 1856 // lookup a method in the default methods list then in all transitive interfaces 1857 // Do NOT return private or static methods 1858 Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name, 1859 Symbol* signature) const { 1860 Method* m = NULL; 1861 if (default_methods() != NULL) { 1862 m = find_method(default_methods(), name, signature); 1863 } 1864 // Look up interfaces 1865 if (m == NULL) { 1866 m = lookup_method_in_all_interfaces(name, signature, find_defaults); 1867 } 1868 return m; 1869 } 1870 1871 // lookup a method in all the interfaces that this class implements 1872 // Do NOT return private or static methods, new in JDK8 which are not externally visible 1873 // They should only be found in the initial InterfaceMethodRef 1874 Method* InstanceKlass::lookup_method_in_all_interfaces(Symbol* name, 1875 Symbol* signature, 1876 DefaultsLookupMode defaults_mode) const { 1877 Array<InstanceKlass*>* all_ifs = transitive_interfaces(); 1878 int num_ifs = all_ifs->length(); 1879 InstanceKlass *ik = NULL; 1880 for (int i = 0; i < num_ifs; i++) { 1881 ik = all_ifs->at(i); 1882 Method* m = ik->lookup_method(name, signature); 1883 if (m != NULL && m->is_public() && !m->is_static() && 1884 ((defaults_mode != skip_defaults) || !m->is_default_method())) { 1885 return m; 1886 } 1887 } 1888 return NULL; 1889 } 1890 1891 /* jni_id_for_impl for jfieldIds only */ 1892 JNIid* InstanceKlass::jni_id_for_impl(int offset) { 1893 MutexLocker ml(JfieldIdCreation_lock); 1894 // Retry lookup after we got the lock 1895 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset); 1896 if (probe == NULL) { 1897 // Slow case, allocate new static field identifier 1898 probe = new JNIid(this, offset, jni_ids()); 1899 set_jni_ids(probe); 1900 } 1901 return probe; 1902 } 1903 1904 1905 /* jni_id_for for jfieldIds only */ 1906 JNIid* InstanceKlass::jni_id_for(int offset) { 1907 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset); 1908 if (probe == NULL) { 1909 probe = jni_id_for_impl(offset); 1910 } 1911 return probe; 1912 } 1913 1914 u2 InstanceKlass::enclosing_method_data(int offset) const { 1915 const Array<jushort>* const inner_class_list = inner_classes(); 1916 if (inner_class_list == NULL) { 1917 return 0; 1918 } 1919 const int length = inner_class_list->length(); 1920 if (length % inner_class_next_offset == 0) { 1921 return 0; 1922 } 1923 const int index = length - enclosing_method_attribute_size; 1924 assert(offset < enclosing_method_attribute_size, "invalid offset"); 1925 return inner_class_list->at(index + offset); 1926 } 1927 1928 void InstanceKlass::set_enclosing_method_indices(u2 class_index, 1929 u2 method_index) { 1930 Array<jushort>* inner_class_list = inner_classes(); 1931 assert (inner_class_list != NULL, "_inner_classes list is not set up"); 1932 int length = inner_class_list->length(); 1933 if (length % inner_class_next_offset == enclosing_method_attribute_size) { 1934 int index = length - enclosing_method_attribute_size; 1935 inner_class_list->at_put( 1936 index + enclosing_method_class_index_offset, class_index); 1937 inner_class_list->at_put( 1938 index + enclosing_method_method_index_offset, method_index); 1939 } 1940 } 1941 1942 // Lookup or create a jmethodID. 1943 // This code is called by the VMThread and JavaThreads so the 1944 // locking has to be done very carefully to avoid deadlocks 1945 // and/or other cache consistency problems. 1946 // 1947 jmethodID InstanceKlass::get_jmethod_id(const methodHandle& method_h) { 1948 size_t idnum = (size_t)method_h->method_idnum(); 1949 jmethodID* jmeths = methods_jmethod_ids_acquire(); 1950 size_t length = 0; 1951 jmethodID id = NULL; 1952 1953 // We use a double-check locking idiom here because this cache is 1954 // performance sensitive. In the normal system, this cache only 1955 // transitions from NULL to non-NULL which is safe because we use 1956 // release_set_methods_jmethod_ids() to advertise the new cache. 1957 // A partially constructed cache should never be seen by a racing 1958 // thread. We also use release_store() to save a new jmethodID 1959 // in the cache so a partially constructed jmethodID should never be 1960 // seen either. Cache reads of existing jmethodIDs proceed without a 1961 // lock, but cache writes of a new jmethodID requires uniqueness and 1962 // creation of the cache itself requires no leaks so a lock is 1963 // generally acquired in those two cases. 1964 // 1965 // If the RedefineClasses() API has been used, then this cache can 1966 // grow and we'll have transitions from non-NULL to bigger non-NULL. 1967 // Cache creation requires no leaks and we require safety between all 1968 // cache accesses and freeing of the old cache so a lock is generally 1969 // acquired when the RedefineClasses() API has been used. 1970 1971 if (jmeths != NULL) { 1972 // the cache already exists 1973 if (!idnum_can_increment()) { 1974 // the cache can't grow so we can just get the current values 1975 get_jmethod_id_length_value(jmeths, idnum, &length, &id); 1976 } else { 1977 // cache can grow so we have to be more careful 1978 if (Threads::number_of_threads() == 0 || 1979 SafepointSynchronize::is_at_safepoint()) { 1980 // we're single threaded or at a safepoint - no locking needed 1981 get_jmethod_id_length_value(jmeths, idnum, &length, &id); 1982 } else { 1983 MutexLocker ml(JmethodIdCreation_lock); 1984 get_jmethod_id_length_value(jmeths, idnum, &length, &id); 1985 } 1986 } 1987 } 1988 // implied else: 1989 // we need to allocate a cache so default length and id values are good 1990 1991 if (jmeths == NULL || // no cache yet 1992 length <= idnum || // cache is too short 1993 id == NULL) { // cache doesn't contain entry 1994 1995 // This function can be called by the VMThread so we have to do all 1996 // things that might block on a safepoint before grabbing the lock. 1997 // Otherwise, we can deadlock with the VMThread or have a cache 1998 // consistency issue. These vars keep track of what we might have 1999 // to free after the lock is dropped. 2000 jmethodID to_dealloc_id = NULL; 2001 jmethodID* to_dealloc_jmeths = NULL; 2002 2003 // may not allocate new_jmeths or use it if we allocate it 2004 jmethodID* new_jmeths = NULL; 2005 if (length <= idnum) { 2006 // allocate a new cache that might be used 2007 size_t size = MAX2(idnum+1, (size_t)idnum_allocated_count()); 2008 new_jmeths = NEW_C_HEAP_ARRAY(jmethodID, size+1, mtClass); 2009 memset(new_jmeths, 0, (size+1)*sizeof(jmethodID)); 2010 // cache size is stored in element[0], other elements offset by one 2011 new_jmeths[0] = (jmethodID)size; 2012 } 2013 2014 // allocate a new jmethodID that might be used 2015 jmethodID new_id = NULL; 2016 if (method_h->is_old() && !method_h->is_obsolete()) { 2017 // The method passed in is old (but not obsolete), we need to use the current version 2018 Method* current_method = method_with_idnum((int)idnum); 2019 assert(current_method != NULL, "old and but not obsolete, so should exist"); 2020 new_id = Method::make_jmethod_id(class_loader_data(), current_method); 2021 } else { 2022 // It is the current version of the method or an obsolete method, 2023 // use the version passed in 2024 new_id = Method::make_jmethod_id(class_loader_data(), method_h()); 2025 } 2026 2027 if (Threads::number_of_threads() == 0 || 2028 SafepointSynchronize::is_at_safepoint()) { 2029 // we're single threaded or at a safepoint - no locking needed 2030 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths, 2031 &to_dealloc_id, &to_dealloc_jmeths); 2032 } else { 2033 MutexLocker ml(JmethodIdCreation_lock); 2034 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths, 2035 &to_dealloc_id, &to_dealloc_jmeths); 2036 } 2037 2038 // The lock has been dropped so we can free resources. 2039 // Free up either the old cache or the new cache if we allocated one. 2040 if (to_dealloc_jmeths != NULL) { 2041 FreeHeap(to_dealloc_jmeths); 2042 } 2043 // free up the new ID since it wasn't needed 2044 if (to_dealloc_id != NULL) { 2045 Method::destroy_jmethod_id(class_loader_data(), to_dealloc_id); 2046 } 2047 } 2048 return id; 2049 } 2050 2051 // Figure out how many jmethodIDs haven't been allocated, and make 2052 // sure space for them is pre-allocated. This makes getting all 2053 // method ids much, much faster with classes with more than 8 2054 // methods, and has a *substantial* effect on performance with jvmti 2055 // code that loads all jmethodIDs for all classes. 2056 void InstanceKlass::ensure_space_for_methodids(int start_offset) { 2057 int new_jmeths = 0; 2058 int length = methods()->length(); 2059 for (int index = start_offset; index < length; index++) { 2060 Method* m = methods()->at(index); 2061 jmethodID id = m->find_jmethod_id_or_null(); 2062 if (id == NULL) { 2063 new_jmeths++; 2064 } 2065 } 2066 if (new_jmeths != 0) { 2067 Method::ensure_jmethod_ids(class_loader_data(), new_jmeths); 2068 } 2069 } 2070 2071 // Common code to fetch the jmethodID from the cache or update the 2072 // cache with the new jmethodID. This function should never do anything 2073 // that causes the caller to go to a safepoint or we can deadlock with 2074 // the VMThread or have cache consistency issues. 2075 // 2076 jmethodID InstanceKlass::get_jmethod_id_fetch_or_update( 2077 size_t idnum, jmethodID new_id, 2078 jmethodID* new_jmeths, jmethodID* to_dealloc_id_p, 2079 jmethodID** to_dealloc_jmeths_p) { 2080 assert(new_id != NULL, "sanity check"); 2081 assert(to_dealloc_id_p != NULL, "sanity check"); 2082 assert(to_dealloc_jmeths_p != NULL, "sanity check"); 2083 assert(Threads::number_of_threads() == 0 || 2084 SafepointSynchronize::is_at_safepoint() || 2085 JmethodIdCreation_lock->owned_by_self(), "sanity check"); 2086 2087 // reacquire the cache - we are locked, single threaded or at a safepoint 2088 jmethodID* jmeths = methods_jmethod_ids_acquire(); 2089 jmethodID id = NULL; 2090 size_t length = 0; 2091 2092 if (jmeths == NULL || // no cache yet 2093 (length = (size_t)jmeths[0]) <= idnum) { // cache is too short 2094 if (jmeths != NULL) { 2095 // copy any existing entries from the old cache 2096 for (size_t index = 0; index < length; index++) { 2097 new_jmeths[index+1] = jmeths[index+1]; 2098 } 2099 *to_dealloc_jmeths_p = jmeths; // save old cache for later delete 2100 } 2101 release_set_methods_jmethod_ids(jmeths = new_jmeths); 2102 } else { 2103 // fetch jmethodID (if any) from the existing cache 2104 id = jmeths[idnum+1]; 2105 *to_dealloc_jmeths_p = new_jmeths; // save new cache for later delete 2106 } 2107 if (id == NULL) { 2108 // No matching jmethodID in the existing cache or we have a new 2109 // cache or we just grew the cache. This cache write is done here 2110 // by the first thread to win the foot race because a jmethodID 2111 // needs to be unique once it is generally available. 2112 id = new_id; 2113 2114 // The jmethodID cache can be read while unlocked so we have to 2115 // make sure the new jmethodID is complete before installing it 2116 // in the cache. 2117 Atomic::release_store(&jmeths[idnum+1], id); 2118 } else { 2119 *to_dealloc_id_p = new_id; // save new id for later delete 2120 } 2121 return id; 2122 } 2123 2124 2125 // Common code to get the jmethodID cache length and the jmethodID 2126 // value at index idnum if there is one. 2127 // 2128 void InstanceKlass::get_jmethod_id_length_value(jmethodID* cache, 2129 size_t idnum, size_t *length_p, jmethodID* id_p) { 2130 assert(cache != NULL, "sanity check"); 2131 assert(length_p != NULL, "sanity check"); 2132 assert(id_p != NULL, "sanity check"); 2133 2134 // cache size is stored in element[0], other elements offset by one 2135 *length_p = (size_t)cache[0]; 2136 if (*length_p <= idnum) { // cache is too short 2137 *id_p = NULL; 2138 } else { 2139 *id_p = cache[idnum+1]; // fetch jmethodID (if any) 2140 } 2141 } 2142 2143 2144 // Lookup a jmethodID, NULL if not found. Do no blocking, no allocations, no handles 2145 jmethodID InstanceKlass::jmethod_id_or_null(Method* method) { 2146 size_t idnum = (size_t)method->method_idnum(); 2147 jmethodID* jmeths = methods_jmethod_ids_acquire(); 2148 size_t length; // length assigned as debugging crumb 2149 jmethodID id = NULL; 2150 if (jmeths != NULL && // If there is a cache 2151 (length = (size_t)jmeths[0]) > idnum) { // and if it is long enough, 2152 id = jmeths[idnum+1]; // Look up the id (may be NULL) 2153 } 2154 return id; 2155 } 2156 2157 inline DependencyContext InstanceKlass::dependencies() { 2158 DependencyContext dep_context(&_dep_context, &_dep_context_last_cleaned); 2159 return dep_context; 2160 } 2161 2162 int InstanceKlass::mark_dependent_nmethods(KlassDepChange& changes) { 2163 return dependencies().mark_dependent_nmethods(changes); 2164 } 2165 2166 void InstanceKlass::add_dependent_nmethod(nmethod* nm) { 2167 dependencies().add_dependent_nmethod(nm); 2168 } 2169 2170 void InstanceKlass::remove_dependent_nmethod(nmethod* nm) { 2171 dependencies().remove_dependent_nmethod(nm); 2172 } 2173 2174 void InstanceKlass::clean_dependency_context() { 2175 dependencies().clean_unloading_dependents(); 2176 } 2177 2178 #ifndef PRODUCT 2179 void InstanceKlass::print_dependent_nmethods(bool verbose) { 2180 dependencies().print_dependent_nmethods(verbose); 2181 } 2182 2183 bool InstanceKlass::is_dependent_nmethod(nmethod* nm) { 2184 return dependencies().is_dependent_nmethod(nm); 2185 } 2186 #endif //PRODUCT 2187 2188 void InstanceKlass::clean_weak_instanceklass_links() { 2189 clean_implementors_list(); 2190 clean_method_data(); 2191 } 2192 2193 void InstanceKlass::clean_implementors_list() { 2194 assert(is_loader_alive(), "this klass should be live"); 2195 if (is_interface()) { 2196 assert (ClassUnloading, "only called for ClassUnloading"); 2197 for (;;) { 2198 // Use load_acquire due to competing with inserts 2199 Klass* impl = Atomic::load_acquire(adr_implementor()); 2200 if (impl != NULL && !impl->is_loader_alive()) { 2201 // NULL this field, might be an unloaded klass or NULL 2202 Klass* volatile* klass = adr_implementor(); 2203 if (Atomic::cmpxchg(klass, impl, (Klass*)NULL) == impl) { 2204 // Successfully unlinking implementor. 2205 if (log_is_enabled(Trace, class, unload)) { 2206 ResourceMark rm; 2207 log_trace(class, unload)("unlinking class (implementor): %s", impl->external_name()); 2208 } 2209 return; 2210 } 2211 } else { 2212 return; 2213 } 2214 } 2215 } 2216 } 2217 2218 void InstanceKlass::clean_method_data() { 2219 for (int m = 0; m < methods()->length(); m++) { 2220 MethodData* mdo = methods()->at(m)->method_data(); 2221 if (mdo != NULL) { 2222 MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : mdo->extra_data_lock()); 2223 mdo->clean_method_data(/*always_clean*/false); 2224 } 2225 } 2226 } 2227 2228 bool InstanceKlass::supers_have_passed_fingerprint_checks() { 2229 if (java_super() != NULL && !java_super()->has_passed_fingerprint_check()) { 2230 ResourceMark rm; 2231 log_trace(class, fingerprint)("%s : super %s not fingerprinted", external_name(), java_super()->external_name()); 2232 return false; 2233 } 2234 2235 Array<InstanceKlass*>* local_interfaces = this->local_interfaces(); 2236 if (local_interfaces != NULL) { 2237 int length = local_interfaces->length(); 2238 for (int i = 0; i < length; i++) { 2239 InstanceKlass* intf = local_interfaces->at(i); 2240 if (!intf->has_passed_fingerprint_check()) { 2241 ResourceMark rm; 2242 log_trace(class, fingerprint)("%s : interface %s not fingerprinted", external_name(), intf->external_name()); 2243 return false; 2244 } 2245 } 2246 } 2247 2248 return true; 2249 } 2250 2251 bool InstanceKlass::should_store_fingerprint(bool is_unsafe_anonymous) { 2252 #if INCLUDE_AOT 2253 // We store the fingerprint into the InstanceKlass only in the following 2 cases: 2254 if (CalculateClassFingerprint) { 2255 // (1) We are running AOT to generate a shared library. 2256 return true; 2257 } 2258 if (Arguments::is_dumping_archive()) { 2259 // (2) We are running -Xshare:dump or -XX:ArchiveClassesAtExit to create a shared archive 2260 return true; 2261 } 2262 if (UseAOT && is_unsafe_anonymous) { 2263 // (3) We are using AOT code from a shared library and see an unsafe anonymous class 2264 return true; 2265 } 2266 #endif 2267 2268 // In all other cases we might set the _misc_has_passed_fingerprint_check bit, 2269 // but do not store the 64-bit fingerprint to save space. 2270 return false; 2271 } 2272 2273 bool InstanceKlass::has_stored_fingerprint() const { 2274 #if INCLUDE_AOT 2275 return should_store_fingerprint() || is_shared(); 2276 #else 2277 return false; 2278 #endif 2279 } 2280 2281 uint64_t InstanceKlass::get_stored_fingerprint() const { 2282 address adr = adr_fingerprint(); 2283 if (adr != NULL) { 2284 return (uint64_t)Bytes::get_native_u8(adr); // adr may not be 64-bit aligned 2285 } 2286 return 0; 2287 } 2288 2289 void InstanceKlass::store_fingerprint(uint64_t fingerprint) { 2290 address adr = adr_fingerprint(); 2291 if (adr != NULL) { 2292 Bytes::put_native_u8(adr, (u8)fingerprint); // adr may not be 64-bit aligned 2293 2294 ResourceMark rm; 2295 log_trace(class, fingerprint)("stored as " PTR64_FORMAT " for class %s", fingerprint, external_name()); 2296 } 2297 } 2298 2299 void InstanceKlass::metaspace_pointers_do(MetaspaceClosure* it) { 2300 Klass::metaspace_pointers_do(it); 2301 2302 if (log_is_enabled(Trace, cds)) { 2303 ResourceMark rm; 2304 log_trace(cds)("Iter(InstanceKlass): %p (%s)", this, external_name()); 2305 } 2306 2307 it->push(&_annotations); 2308 it->push((Klass**)&_array_klasses); 2309 it->push(&_constants); 2310 it->push(&_inner_classes); 2311 it->push(&_array_name); 2312 #if INCLUDE_JVMTI 2313 it->push(&_previous_versions); 2314 #endif 2315 it->push(&_methods); 2316 it->push(&_default_methods); 2317 it->push(&_local_interfaces); 2318 it->push(&_transitive_interfaces); 2319 it->push(&_method_ordering); 2320 it->push(&_default_vtable_indices); 2321 it->push(&_fields); 2322 2323 if (itable_length() > 0) { 2324 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable(); 2325 int method_table_offset_in_words = ioe->offset()/wordSize; 2326 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words()) 2327 / itableOffsetEntry::size(); 2328 2329 for (int i = 0; i < nof_interfaces; i ++, ioe ++) { 2330 if (ioe->interface_klass() != NULL) { 2331 it->push(ioe->interface_klass_addr()); 2332 itableMethodEntry* ime = ioe->first_method_entry(this); 2333 int n = klassItable::method_count_for_interface(ioe->interface_klass()); 2334 for (int index = 0; index < n; index ++) { 2335 it->push(ime[index].method_addr()); 2336 } 2337 } 2338 } 2339 } 2340 2341 it->push(&_nest_members); 2342 } 2343 2344 void InstanceKlass::remove_unshareable_info() { 2345 Klass::remove_unshareable_info(); 2346 2347 if (is_in_error_state()) { 2348 // Classes are attempted to link during dumping and may fail, 2349 // but these classes are still in the dictionary and class list in CLD. 2350 // Check in_error state first because in_error is > linked state, so 2351 // is_linked() is true. 2352 // If there's a linking error, there is nothing else to remove. 2353 return; 2354 } 2355 2356 // Reset to the 'allocated' state to prevent any premature accessing to 2357 // a shared class at runtime while the class is still being loaded and 2358 // restored. A class' init_state is set to 'loaded' at runtime when it's 2359 // being added to class hierarchy (see SystemDictionary:::add_to_hierarchy()). 2360 _init_state = allocated; 2361 2362 { // Otherwise this needs to take out the Compile_lock. 2363 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); 2364 init_implementor(); 2365 } 2366 2367 constants()->remove_unshareable_info(); 2368 2369 for (int i = 0; i < methods()->length(); i++) { 2370 Method* m = methods()->at(i); 2371 m->remove_unshareable_info(); 2372 } 2373 2374 // do array classes also. 2375 if (array_klasses() != NULL) { 2376 array_klasses()->remove_unshareable_info(); 2377 } 2378 2379 // These are not allocated from metaspace. They are safe to set to NULL. 2380 _source_debug_extension = NULL; 2381 _dep_context = NULL; 2382 _osr_nmethods_head = NULL; 2383 #if INCLUDE_JVMTI 2384 _breakpoints = NULL; 2385 _previous_versions = NULL; 2386 _cached_class_file = NULL; 2387 _jvmti_cached_class_field_map = NULL; 2388 #endif 2389 2390 _init_thread = NULL; 2391 _methods_jmethod_ids = NULL; 2392 _jni_ids = NULL; 2393 _oop_map_cache = NULL; 2394 // clear _nest_host to ensure re-load at runtime 2395 _nest_host = NULL; 2396 _package_entry = NULL; 2397 _dep_context_last_cleaned = 0; 2398 } 2399 2400 void InstanceKlass::remove_java_mirror() { 2401 Klass::remove_java_mirror(); 2402 2403 // do array classes also. 2404 if (array_klasses() != NULL) { 2405 array_klasses()->remove_java_mirror(); 2406 } 2407 } 2408 2409 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS) { 2410 // SystemDictionary::add_to_hierarchy() sets the init_state to loaded 2411 // before the InstanceKlass is added to the SystemDictionary. Make 2412 // sure the current state is <loaded. 2413 assert(!is_loaded(), "invalid init state"); 2414 set_package(loader_data, CHECK); 2415 Klass::restore_unshareable_info(loader_data, protection_domain, CHECK); 2416 2417 Array<Method*>* methods = this->methods(); 2418 int num_methods = methods->length(); 2419 for (int index = 0; index < num_methods; ++index) { 2420 methods->at(index)->restore_unshareable_info(CHECK); 2421 } 2422 if (JvmtiExport::has_redefined_a_class()) { 2423 // Reinitialize vtable because RedefineClasses may have changed some 2424 // entries in this vtable for super classes so the CDS vtable might 2425 // point to old or obsolete entries. RedefineClasses doesn't fix up 2426 // vtables in the shared system dictionary, only the main one. 2427 // It also redefines the itable too so fix that too. 2428 vtable().initialize_vtable(false, CHECK); 2429 itable().initialize_itable(false, CHECK); 2430 } 2431 2432 // restore constant pool resolved references 2433 constants()->restore_unshareable_info(CHECK); 2434 2435 if (array_klasses() != NULL) { 2436 // Array classes have null protection domain. 2437 // --> see ArrayKlass::complete_create_array_klass() 2438 array_klasses()->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK); 2439 } 2440 2441 // Initialize current biased locking state. 2442 if (UseBiasedLocking && BiasedLocking::enabled()) { 2443 set_prototype_header(markWord::biased_locking_prototype()); 2444 } 2445 } 2446 2447 // returns true IFF is_in_error_state() has been changed as a result of this call. 2448 bool InstanceKlass::check_sharing_error_state() { 2449 assert(DumpSharedSpaces, "should only be called during dumping"); 2450 bool old_state = is_in_error_state(); 2451 2452 if (!is_in_error_state()) { 2453 bool bad = false; 2454 for (InstanceKlass* sup = java_super(); sup; sup = sup->java_super()) { 2455 if (sup->is_in_error_state()) { 2456 bad = true; 2457 break; 2458 } 2459 } 2460 if (!bad) { 2461 Array<InstanceKlass*>* interfaces = transitive_interfaces(); 2462 for (int i = 0; i < interfaces->length(); i++) { 2463 InstanceKlass* iface = interfaces->at(i); 2464 if (iface->is_in_error_state()) { 2465 bad = true; 2466 break; 2467 } 2468 } 2469 } 2470 2471 if (bad) { 2472 set_in_error_state(); 2473 } 2474 } 2475 2476 return (old_state != is_in_error_state()); 2477 } 2478 2479 void InstanceKlass::set_class_loader_type(s2 loader_type) { 2480 switch (loader_type) { 2481 case ClassLoader::BOOT_LOADER: 2482 _misc_flags |= _misc_is_shared_boot_class; 2483 break; 2484 case ClassLoader::PLATFORM_LOADER: 2485 _misc_flags |= _misc_is_shared_platform_class; 2486 break; 2487 case ClassLoader::APP_LOADER: 2488 _misc_flags |= _misc_is_shared_app_class; 2489 break; 2490 default: 2491 ShouldNotReachHere(); 2492 break; 2493 } 2494 } 2495 2496 #if INCLUDE_JVMTI 2497 static void clear_all_breakpoints(Method* m) { 2498 m->clear_all_breakpoints(); 2499 } 2500 #endif 2501 2502 void InstanceKlass::unload_class(InstanceKlass* ik) { 2503 // Release dependencies. 2504 ik->dependencies().remove_all_dependents(); 2505 2506 // notify the debugger 2507 if (JvmtiExport::should_post_class_unload()) { 2508 JvmtiExport::post_class_unload(ik); 2509 } 2510 2511 // notify ClassLoadingService of class unload 2512 ClassLoadingService::notify_class_unloaded(ik); 2513 2514 if (Arguments::is_dumping_archive()) { 2515 SystemDictionaryShared::remove_dumptime_info(ik); 2516 } 2517 2518 if (log_is_enabled(Info, class, unload)) { 2519 ResourceMark rm; 2520 log_info(class, unload)("unloading class %s " INTPTR_FORMAT, ik->external_name(), p2i(ik)); 2521 } 2522 2523 Events::log_class_unloading(Thread::current(), ik); 2524 2525 #if INCLUDE_JFR 2526 assert(ik != NULL, "invariant"); 2527 EventClassUnload event; 2528 event.set_unloadedClass(ik); 2529 event.set_definingClassLoader(ik->class_loader_data()); 2530 event.commit(); 2531 #endif 2532 } 2533 2534 static void method_release_C_heap_structures(Method* m) { 2535 m->release_C_heap_structures(); 2536 } 2537 2538 void InstanceKlass::release_C_heap_structures(InstanceKlass* ik) { 2539 // Clean up C heap 2540 ik->release_C_heap_structures(); 2541 ik->constants()->release_C_heap_structures(); 2542 2543 // Deallocate and call destructors for MDO mutexes 2544 ik->methods_do(method_release_C_heap_structures); 2545 2546 } 2547 2548 void InstanceKlass::release_C_heap_structures() { 2549 // Can't release the constant pool here because the constant pool can be 2550 // deallocated separately from the InstanceKlass for default methods and 2551 // redefine classes. 2552 2553 // Deallocate oop map cache 2554 if (_oop_map_cache != NULL) { 2555 delete _oop_map_cache; 2556 _oop_map_cache = NULL; 2557 } 2558 2559 // Deallocate JNI identifiers for jfieldIDs 2560 JNIid::deallocate(jni_ids()); 2561 set_jni_ids(NULL); 2562 2563 jmethodID* jmeths = methods_jmethod_ids_acquire(); 2564 if (jmeths != (jmethodID*)NULL) { 2565 release_set_methods_jmethod_ids(NULL); 2566 FreeHeap(jmeths); 2567 } 2568 2569 assert(_dep_context == NULL, 2570 "dependencies should already be cleaned"); 2571 2572 #if INCLUDE_JVMTI 2573 // Deallocate breakpoint records 2574 if (breakpoints() != 0x0) { 2575 methods_do(clear_all_breakpoints); 2576 assert(breakpoints() == 0x0, "should have cleared breakpoints"); 2577 } 2578 2579 // deallocate the cached class file 2580 if (_cached_class_file != NULL) { 2581 os::free(_cached_class_file); 2582 _cached_class_file = NULL; 2583 } 2584 #endif 2585 2586 // Decrement symbol reference counts associated with the unloaded class. 2587 if (_name != NULL) _name->decrement_refcount(); 2588 // unreference array name derived from this class name (arrays of an unloaded 2589 // class can't be referenced anymore). 2590 if (_array_name != NULL) _array_name->decrement_refcount(); 2591 FREE_C_HEAP_ARRAY(char, _source_debug_extension); 2592 } 2593 2594 void InstanceKlass::set_source_debug_extension(const char* array, int length) { 2595 if (array == NULL) { 2596 _source_debug_extension = NULL; 2597 } else { 2598 // Adding one to the attribute length in order to store a null terminator 2599 // character could cause an overflow because the attribute length is 2600 // already coded with an u4 in the classfile, but in practice, it's 2601 // unlikely to happen. 2602 assert((length+1) > length, "Overflow checking"); 2603 char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass); 2604 for (int i = 0; i < length; i++) { 2605 sde[i] = array[i]; 2606 } 2607 sde[length] = '\0'; 2608 _source_debug_extension = sde; 2609 } 2610 } 2611 2612 const char* InstanceKlass::signature_name() const { 2613 int hash_len = 0; 2614 char hash_buf[40]; 2615 2616 // If this is an unsafe anonymous class, append a hash to make the name unique 2617 if (is_unsafe_anonymous()) { 2618 intptr_t hash = (java_mirror() != NULL) ? java_mirror()->identity_hash() : 0; 2619 jio_snprintf(hash_buf, sizeof(hash_buf), "/" UINTX_FORMAT, (uintx)hash); 2620 hash_len = (int)strlen(hash_buf); 2621 } 2622 2623 // Get the internal name as a c string 2624 const char* src = (const char*) (name()->as_C_string()); 2625 const int src_length = (int)strlen(src); 2626 2627 char* dest = NEW_RESOURCE_ARRAY(char, src_length + hash_len + 3); 2628 2629 // Add L as type indicator 2630 int dest_index = 0; 2631 dest[dest_index++] = JVM_SIGNATURE_CLASS; 2632 2633 // Add the actual class name 2634 for (int src_index = 0; src_index < src_length; ) { 2635 dest[dest_index++] = src[src_index++]; 2636 } 2637 2638 // If we have a hash, append it 2639 for (int hash_index = 0; hash_index < hash_len; ) { 2640 dest[dest_index++] = hash_buf[hash_index++]; 2641 } 2642 2643 // Add the semicolon and the NULL 2644 dest[dest_index++] = JVM_SIGNATURE_ENDCLASS; 2645 dest[dest_index] = '\0'; 2646 return dest; 2647 } 2648 2649 // Used to obtain the package name from a fully qualified class name. 2650 Symbol* InstanceKlass::package_from_name(const Symbol* name, TRAPS) { 2651 if (name == NULL) { 2652 return NULL; 2653 } else { 2654 if (name->utf8_length() <= 0) { 2655 return NULL; 2656 } 2657 ResourceMark rm; 2658 const char* package_name = ClassLoader::package_from_name((const char*) name->as_C_string()); 2659 if (package_name == NULL) { 2660 return NULL; 2661 } 2662 Symbol* pkg_name = SymbolTable::new_symbol(package_name); 2663 return pkg_name; 2664 } 2665 } 2666 2667 ModuleEntry* InstanceKlass::module() const { 2668 // For an unsafe anonymous class return the host class' module 2669 if (is_unsafe_anonymous()) { 2670 assert(unsafe_anonymous_host() != NULL, "unsafe anonymous class must have a host class"); 2671 return unsafe_anonymous_host()->module(); 2672 } 2673 2674 // Class is in a named package 2675 if (!in_unnamed_package()) { 2676 return _package_entry->module(); 2677 } 2678 2679 // Class is in an unnamed package, return its loader's unnamed module 2680 return class_loader_data()->unnamed_module(); 2681 } 2682 2683 void InstanceKlass::set_package(ClassLoaderData* loader_data, TRAPS) { 2684 2685 // ensure java/ packages only loaded by boot or platform builtin loaders 2686 check_prohibited_package(name(), loader_data, CHECK); 2687 2688 TempNewSymbol pkg_name = package_from_name(name(), CHECK); 2689 2690 if (pkg_name != NULL && loader_data != NULL) { 2691 2692 // Find in class loader's package entry table. 2693 _package_entry = loader_data->packages()->lookup_only(pkg_name); 2694 2695 // If the package name is not found in the loader's package 2696 // entry table, it is an indication that the package has not 2697 // been defined. Consider it defined within the unnamed module. 2698 if (_package_entry == NULL) { 2699 ResourceMark rm; 2700 2701 if (!ModuleEntryTable::javabase_defined()) { 2702 // Before java.base is defined during bootstrapping, define all packages in 2703 // the java.base module. If a non-java.base package is erroneously placed 2704 // in the java.base module it will be caught later when java.base 2705 // is defined by ModuleEntryTable::verify_javabase_packages check. 2706 assert(ModuleEntryTable::javabase_moduleEntry() != NULL, JAVA_BASE_NAME " module is NULL"); 2707 _package_entry = loader_data->packages()->lookup(pkg_name, ModuleEntryTable::javabase_moduleEntry()); 2708 } else { 2709 assert(loader_data->unnamed_module() != NULL, "unnamed module is NULL"); 2710 _package_entry = loader_data->packages()->lookup(pkg_name, 2711 loader_data->unnamed_module()); 2712 } 2713 2714 // A package should have been successfully created 2715 assert(_package_entry != NULL, "Package entry for class %s not found, loader %s", 2716 name()->as_C_string(), loader_data->loader_name_and_id()); 2717 } 2718 2719 if (log_is_enabled(Debug, module)) { 2720 ResourceMark rm; 2721 ModuleEntry* m = _package_entry->module(); 2722 log_trace(module)("Setting package: class: %s, package: %s, loader: %s, module: %s", 2723 external_name(), 2724 pkg_name->as_C_string(), 2725 loader_data->loader_name_and_id(), 2726 (m->is_named() ? m->name()->as_C_string() : UNNAMED_MODULE)); 2727 } 2728 } else { 2729 ResourceMark rm; 2730 log_trace(module)("Setting package: class: %s, package: unnamed, loader: %s, module: %s", 2731 external_name(), 2732 (loader_data != NULL) ? loader_data->loader_name_and_id() : "NULL", 2733 UNNAMED_MODULE); 2734 } 2735 } 2736 2737 2738 // different versions of is_same_class_package 2739 2740 bool InstanceKlass::is_same_class_package(const Klass* class2) const { 2741 oop classloader1 = this->class_loader(); 2742 PackageEntry* classpkg1 = this->package(); 2743 if (class2->is_objArray_klass()) { 2744 class2 = ObjArrayKlass::cast(class2)->bottom_klass(); 2745 } 2746 2747 oop classloader2; 2748 PackageEntry* classpkg2; 2749 if (class2->is_instance_klass()) { 2750 classloader2 = class2->class_loader(); 2751 classpkg2 = class2->package(); 2752 } else { 2753 assert(class2->is_typeArray_klass(), "should be type array"); 2754 classloader2 = NULL; 2755 classpkg2 = NULL; 2756 } 2757 2758 // Same package is determined by comparing class loader 2759 // and package entries. Both must be the same. This rule 2760 // applies even to classes that are defined in the unnamed 2761 // package, they still must have the same class loader. 2762 if ((classloader1 == classloader2) && (classpkg1 == classpkg2)) { 2763 return true; 2764 } 2765 2766 return false; 2767 } 2768 2769 // return true if this class and other_class are in the same package. Classloader 2770 // and classname information is enough to determine a class's package 2771 bool InstanceKlass::is_same_class_package(oop other_class_loader, 2772 const Symbol* other_class_name) const { 2773 if (class_loader() != other_class_loader) { 2774 return false; 2775 } 2776 if (name()->fast_compare(other_class_name) == 0) { 2777 return true; 2778 } 2779 2780 { 2781 ResourceMark rm; 2782 2783 bool bad_class_name = false; 2784 const char* other_pkg = 2785 ClassLoader::package_from_name((const char*) other_class_name->as_C_string(), &bad_class_name); 2786 if (bad_class_name) { 2787 return false; 2788 } 2789 // Check that package_from_name() returns NULL, not "", if there is no package. 2790 assert(other_pkg == NULL || strlen(other_pkg) > 0, "package name is empty string"); 2791 2792 const Symbol* const this_package_name = 2793 this->package() != NULL ? this->package()->name() : NULL; 2794 2795 if (this_package_name == NULL || other_pkg == NULL) { 2796 // One of the two doesn't have a package. Only return true if the other 2797 // one also doesn't have a package. 2798 return (const char*)this_package_name == other_pkg; 2799 } 2800 2801 // Check if package is identical 2802 return this_package_name->equals(other_pkg); 2803 } 2804 } 2805 2806 // Returns true iff super_method can be overridden by a method in targetclassname 2807 // See JLS 3rd edition 8.4.6.1 2808 // Assumes name-signature match 2809 // "this" is InstanceKlass of super_method which must exist 2810 // note that the InstanceKlass of the method in the targetclassname has not always been created yet 2811 bool InstanceKlass::is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS) { 2812 // Private methods can not be overridden 2813 if (super_method->is_private()) { 2814 return false; 2815 } 2816 // If super method is accessible, then override 2817 if ((super_method->is_protected()) || 2818 (super_method->is_public())) { 2819 return true; 2820 } 2821 // Package-private methods are not inherited outside of package 2822 assert(super_method->is_package_private(), "must be package private"); 2823 return(is_same_class_package(targetclassloader(), targetclassname)); 2824 } 2825 2826 // Only boot and platform class loaders can define classes in "java/" packages. 2827 void InstanceKlass::check_prohibited_package(Symbol* class_name, 2828 ClassLoaderData* loader_data, 2829 TRAPS) { 2830 if (!loader_data->is_boot_class_loader_data() && 2831 !loader_data->is_platform_class_loader_data() && 2832 class_name != NULL) { 2833 ResourceMark rm(THREAD); 2834 char* name = class_name->as_C_string(); 2835 if (strncmp(name, JAVAPKG, JAVAPKG_LEN) == 0 && name[JAVAPKG_LEN] == '/') { 2836 TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK); 2837 assert(pkg_name != NULL, "Error in parsing package name starting with 'java/'"); 2838 name = pkg_name->as_C_string(); 2839 const char* class_loader_name = loader_data->loader_name_and_id(); 2840 StringUtils::replace_no_expand(name, "/", "."); 2841 const char* msg_text1 = "Class loader (instance of): "; 2842 const char* msg_text2 = " tried to load prohibited package name: "; 2843 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + strlen(name) + 1; 2844 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len); 2845 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, name); 2846 THROW_MSG(vmSymbols::java_lang_SecurityException(), message); 2847 } 2848 } 2849 return; 2850 } 2851 2852 bool InstanceKlass::find_inner_classes_attr(int* ooff, int* noff, TRAPS) const { 2853 constantPoolHandle i_cp(THREAD, constants()); 2854 for (InnerClassesIterator iter(this); !iter.done(); iter.next()) { 2855 int ioff = iter.inner_class_info_index(); 2856 if (ioff != 0) { 2857 // Check to see if the name matches the class we're looking for 2858 // before attempting to find the class. 2859 if (i_cp->klass_name_at_matches(this, ioff)) { 2860 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_false); 2861 if (this == inner_klass) { 2862 *ooff = iter.outer_class_info_index(); 2863 *noff = iter.inner_name_index(); 2864 return true; 2865 } 2866 } 2867 } 2868 } 2869 return false; 2870 } 2871 2872 InstanceKlass* InstanceKlass::compute_enclosing_class(bool* inner_is_member, TRAPS) const { 2873 InstanceKlass* outer_klass = NULL; 2874 *inner_is_member = false; 2875 int ooff = 0, noff = 0; 2876 bool has_inner_classes_attr = find_inner_classes_attr(&ooff, &noff, THREAD); 2877 if (has_inner_classes_attr) { 2878 constantPoolHandle i_cp(THREAD, constants()); 2879 if (ooff != 0) { 2880 Klass* ok = i_cp->klass_at(ooff, CHECK_NULL); 2881 outer_klass = InstanceKlass::cast(ok); 2882 *inner_is_member = true; 2883 } 2884 if (NULL == outer_klass) { 2885 // It may be unsafe anonymous; try for that. 2886 int encl_method_class_idx = enclosing_method_class_index(); 2887 if (encl_method_class_idx != 0) { 2888 Klass* ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL); 2889 outer_klass = InstanceKlass::cast(ok); 2890 *inner_is_member = false; 2891 } 2892 } 2893 } 2894 2895 // If no inner class attribute found for this class. 2896 if (NULL == outer_klass) return NULL; 2897 2898 // Throws an exception if outer klass has not declared k as an inner klass 2899 // We need evidence that each klass knows about the other, or else 2900 // the system could allow a spoof of an inner class to gain access rights. 2901 Reflection::check_for_inner_class(outer_klass, this, *inner_is_member, CHECK_NULL); 2902 return outer_klass; 2903 } 2904 2905 jint InstanceKlass::compute_modifier_flags(TRAPS) const { 2906 jint access = access_flags().as_int(); 2907 2908 // But check if it happens to be member class. 2909 InnerClassesIterator iter(this); 2910 for (; !iter.done(); iter.next()) { 2911 int ioff = iter.inner_class_info_index(); 2912 // Inner class attribute can be zero, skip it. 2913 // Strange but true: JVM spec. allows null inner class refs. 2914 if (ioff == 0) continue; 2915 2916 // only look at classes that are already loaded 2917 // since we are looking for the flags for our self. 2918 Symbol* inner_name = constants()->klass_name_at(ioff); 2919 if (name() == inner_name) { 2920 // This is really a member class. 2921 access = iter.inner_access_flags(); 2922 break; 2923 } 2924 } 2925 // Remember to strip ACC_SUPER bit 2926 return (access & (~JVM_ACC_SUPER)) & JVM_ACC_WRITTEN_FLAGS; 2927 } 2928 2929 jint InstanceKlass::jvmti_class_status() const { 2930 jint result = 0; 2931 2932 if (is_linked()) { 2933 result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED; 2934 } 2935 2936 if (is_initialized()) { 2937 assert(is_linked(), "Class status is not consistent"); 2938 result |= JVMTI_CLASS_STATUS_INITIALIZED; 2939 } 2940 if (is_in_error_state()) { 2941 result |= JVMTI_CLASS_STATUS_ERROR; 2942 } 2943 return result; 2944 } 2945 2946 Method* InstanceKlass::method_at_itable(Klass* holder, int index, TRAPS) { 2947 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable(); 2948 int method_table_offset_in_words = ioe->offset()/wordSize; 2949 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words()) 2950 / itableOffsetEntry::size(); 2951 2952 for (int cnt = 0 ; ; cnt ++, ioe ++) { 2953 // If the interface isn't implemented by the receiver class, 2954 // the VM should throw IncompatibleClassChangeError. 2955 if (cnt >= nof_interfaces) { 2956 ResourceMark rm(THREAD); 2957 stringStream ss; 2958 bool same_module = (module() == holder->module()); 2959 ss.print("Receiver class %s does not implement " 2960 "the interface %s defining the method to be called " 2961 "(%s%s%s)", 2962 external_name(), holder->external_name(), 2963 (same_module) ? joint_in_module_of_loader(holder) : class_in_module_of_loader(), 2964 (same_module) ? "" : "; ", 2965 (same_module) ? "" : holder->class_in_module_of_loader()); 2966 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string()); 2967 } 2968 2969 Klass* ik = ioe->interface_klass(); 2970 if (ik == holder) break; 2971 } 2972 2973 itableMethodEntry* ime = ioe->first_method_entry(this); 2974 Method* m = ime[index].method(); 2975 if (m == NULL) { 2976 THROW_NULL(vmSymbols::java_lang_AbstractMethodError()); 2977 } 2978 return m; 2979 } 2980 2981 2982 #if INCLUDE_JVMTI 2983 // update default_methods for redefineclasses for methods that are 2984 // not yet in the vtable due to concurrent subclass define and superinterface 2985 // redefinition 2986 // Note: those in the vtable, should have been updated via adjust_method_entries 2987 void InstanceKlass::adjust_default_methods(bool* trace_name_printed) { 2988 // search the default_methods for uses of either obsolete or EMCP methods 2989 if (default_methods() != NULL) { 2990 for (int index = 0; index < default_methods()->length(); index ++) { 2991 Method* old_method = default_methods()->at(index); 2992 if (old_method == NULL || !old_method->is_old()) { 2993 continue; // skip uninteresting entries 2994 } 2995 assert(!old_method->is_deleted(), "default methods may not be deleted"); 2996 Method* new_method = old_method->get_new_method(); 2997 default_methods()->at_put(index, new_method); 2998 2999 if (log_is_enabled(Info, redefine, class, update)) { 3000 ResourceMark rm; 3001 if (!(*trace_name_printed)) { 3002 log_info(redefine, class, update) 3003 ("adjust: klassname=%s default methods from name=%s", 3004 external_name(), old_method->method_holder()->external_name()); 3005 *trace_name_printed = true; 3006 } 3007 log_debug(redefine, class, update, vtables) 3008 ("default method update: %s(%s) ", 3009 new_method->name()->as_C_string(), new_method->signature()->as_C_string()); 3010 } 3011 } 3012 } 3013 } 3014 #endif // INCLUDE_JVMTI 3015 3016 // On-stack replacement stuff 3017 void InstanceKlass::add_osr_nmethod(nmethod* n) { 3018 assert_lock_strong(CompiledMethod_lock); 3019 #ifndef PRODUCT 3020 if (TieredCompilation) { 3021 nmethod * prev = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), n->comp_level(), true); 3022 assert(prev == NULL || !prev->is_in_use(), 3023 "redundunt OSR recompilation detected. memory leak in CodeCache!"); 3024 } 3025 #endif 3026 // only one compilation can be active 3027 { 3028 assert(n->is_osr_method(), "wrong kind of nmethod"); 3029 n->set_osr_link(osr_nmethods_head()); 3030 set_osr_nmethods_head(n); 3031 // Raise the highest osr level if necessary 3032 if (TieredCompilation) { 3033 Method* m = n->method(); 3034 m->set_highest_osr_comp_level(MAX2(m->highest_osr_comp_level(), n->comp_level())); 3035 } 3036 } 3037 3038 // Get rid of the osr methods for the same bci that have lower levels. 3039 if (TieredCompilation) { 3040 for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) { 3041 nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true); 3042 if (inv != NULL && inv->is_in_use()) { 3043 inv->make_not_entrant(); 3044 } 3045 } 3046 } 3047 } 3048 3049 // Remove osr nmethod from the list. Return true if found and removed. 3050 bool InstanceKlass::remove_osr_nmethod(nmethod* n) { 3051 // This is a short non-blocking critical region, so the no safepoint check is ok. 3052 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock 3053 , Mutex::_no_safepoint_check_flag); 3054 assert(n->is_osr_method(), "wrong kind of nmethod"); 3055 nmethod* last = NULL; 3056 nmethod* cur = osr_nmethods_head(); 3057 int max_level = CompLevel_none; // Find the max comp level excluding n 3058 Method* m = n->method(); 3059 // Search for match 3060 bool found = false; 3061 while(cur != NULL && cur != n) { 3062 if (TieredCompilation && m == cur->method()) { 3063 // Find max level before n 3064 max_level = MAX2(max_level, cur->comp_level()); 3065 } 3066 last = cur; 3067 cur = cur->osr_link(); 3068 } 3069 nmethod* next = NULL; 3070 if (cur == n) { 3071 found = true; 3072 next = cur->osr_link(); 3073 if (last == NULL) { 3074 // Remove first element 3075 set_osr_nmethods_head(next); 3076 } else { 3077 last->set_osr_link(next); 3078 } 3079 } 3080 n->set_osr_link(NULL); 3081 if (TieredCompilation) { 3082 cur = next; 3083 while (cur != NULL) { 3084 // Find max level after n 3085 if (m == cur->method()) { 3086 max_level = MAX2(max_level, cur->comp_level()); 3087 } 3088 cur = cur->osr_link(); 3089 } 3090 m->set_highest_osr_comp_level(max_level); 3091 } 3092 return found; 3093 } 3094 3095 int InstanceKlass::mark_osr_nmethods(const Method* m) { 3096 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, 3097 Mutex::_no_safepoint_check_flag); 3098 nmethod* osr = osr_nmethods_head(); 3099 int found = 0; 3100 while (osr != NULL) { 3101 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain"); 3102 if (osr->method() == m) { 3103 osr->mark_for_deoptimization(); 3104 found++; 3105 } 3106 osr = osr->osr_link(); 3107 } 3108 return found; 3109 } 3110 3111 nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const { 3112 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, 3113 Mutex::_no_safepoint_check_flag); 3114 nmethod* osr = osr_nmethods_head(); 3115 nmethod* best = NULL; 3116 while (osr != NULL) { 3117 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain"); 3118 // There can be a time when a c1 osr method exists but we are waiting 3119 // for a c2 version. When c2 completes its osr nmethod we will trash 3120 // the c1 version and only be able to find the c2 version. However 3121 // while we overflow in the c1 code at back branches we don't want to 3122 // try and switch to the same code as we are already running 3123 3124 if (osr->method() == m && 3125 (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) { 3126 if (match_level) { 3127 if (osr->comp_level() == comp_level) { 3128 // Found a match - return it. 3129 return osr; 3130 } 3131 } else { 3132 if (best == NULL || (osr->comp_level() > best->comp_level())) { 3133 if (osr->comp_level() == CompLevel_highest_tier) { 3134 // Found the best possible - return it. 3135 return osr; 3136 } 3137 best = osr; 3138 } 3139 } 3140 } 3141 osr = osr->osr_link(); 3142 } 3143 3144 assert(match_level == false || best == NULL, "shouldn't pick up anything if match_level is set"); 3145 if (best != NULL && best->comp_level() >= comp_level) { 3146 return best; 3147 } 3148 return NULL; 3149 } 3150 3151 // ----------------------------------------------------------------------------------------------------- 3152 // Printing 3153 3154 #ifndef PRODUCT 3155 3156 #define BULLET " - " 3157 3158 static const char* state_names[] = { 3159 "allocated", "loaded", "linked", "being_initialized", "fully_initialized", "initialization_error" 3160 }; 3161 3162 static void print_vtable(intptr_t* start, int len, outputStream* st) { 3163 for (int i = 0; i < len; i++) { 3164 intptr_t e = start[i]; 3165 st->print("%d : " INTPTR_FORMAT, i, e); 3166 if (MetaspaceObj::is_valid((Metadata*)e)) { 3167 st->print(" "); 3168 ((Metadata*)e)->print_value_on(st); 3169 } 3170 st->cr(); 3171 } 3172 } 3173 3174 static void print_vtable(vtableEntry* start, int len, outputStream* st) { 3175 return print_vtable(reinterpret_cast<intptr_t*>(start), len, st); 3176 } 3177 3178 void InstanceKlass::print_on(outputStream* st) const { 3179 assert(is_klass(), "must be klass"); 3180 Klass::print_on(st); 3181 3182 st->print(BULLET"instance size: %d", size_helper()); st->cr(); 3183 st->print(BULLET"klass size: %d", size()); st->cr(); 3184 st->print(BULLET"access: "); access_flags().print_on(st); st->cr(); 3185 st->print(BULLET"state: "); st->print_cr("%s", state_names[_init_state]); 3186 st->print(BULLET"name: "); name()->print_value_on(st); st->cr(); 3187 st->print(BULLET"super: "); Metadata::print_value_on_maybe_null(st, super()); st->cr(); 3188 st->print(BULLET"sub: "); 3189 Klass* sub = subklass(); 3190 int n; 3191 for (n = 0; sub != NULL; n++, sub = sub->next_sibling()) { 3192 if (n < MaxSubklassPrintSize) { 3193 sub->print_value_on(st); 3194 st->print(" "); 3195 } 3196 } 3197 if (n >= MaxSubklassPrintSize) st->print("(" INTX_FORMAT " more klasses...)", n - MaxSubklassPrintSize); 3198 st->cr(); 3199 3200 if (is_interface()) { 3201 st->print_cr(BULLET"nof implementors: %d", nof_implementors()); 3202 if (nof_implementors() == 1) { 3203 st->print_cr(BULLET"implementor: "); 3204 st->print(" "); 3205 implementor()->print_value_on(st); 3206 st->cr(); 3207 } 3208 } 3209 3210 st->print(BULLET"arrays: "); Metadata::print_value_on_maybe_null(st, array_klasses()); st->cr(); 3211 st->print(BULLET"methods: "); methods()->print_value_on(st); st->cr(); 3212 if (Verbose || WizardMode) { 3213 Array<Method*>* method_array = methods(); 3214 for (int i = 0; i < method_array->length(); i++) { 3215 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr(); 3216 } 3217 } 3218 st->print(BULLET"method ordering: "); method_ordering()->print_value_on(st); st->cr(); 3219 st->print(BULLET"default_methods: "); default_methods()->print_value_on(st); st->cr(); 3220 if (Verbose && default_methods() != NULL) { 3221 Array<Method*>* method_array = default_methods(); 3222 for (int i = 0; i < method_array->length(); i++) { 3223 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr(); 3224 } 3225 } 3226 if (default_vtable_indices() != NULL) { 3227 st->print(BULLET"default vtable indices: "); default_vtable_indices()->print_value_on(st); st->cr(); 3228 } 3229 st->print(BULLET"local interfaces: "); local_interfaces()->print_value_on(st); st->cr(); 3230 st->print(BULLET"trans. interfaces: "); transitive_interfaces()->print_value_on(st); st->cr(); 3231 st->print(BULLET"constants: "); constants()->print_value_on(st); st->cr(); 3232 if (class_loader_data() != NULL) { 3233 st->print(BULLET"class loader data: "); 3234 class_loader_data()->print_value_on(st); 3235 st->cr(); 3236 } 3237 st->print(BULLET"unsafe anonymous host class: "); Metadata::print_value_on_maybe_null(st, unsafe_anonymous_host()); st->cr(); 3238 if (source_file_name() != NULL) { 3239 st->print(BULLET"source file: "); 3240 source_file_name()->print_value_on(st); 3241 st->cr(); 3242 } 3243 if (source_debug_extension() != NULL) { 3244 st->print(BULLET"source debug extension: "); 3245 st->print("%s", source_debug_extension()); 3246 st->cr(); 3247 } 3248 st->print(BULLET"class annotations: "); class_annotations()->print_value_on(st); st->cr(); 3249 st->print(BULLET"class type annotations: "); class_type_annotations()->print_value_on(st); st->cr(); 3250 st->print(BULLET"field annotations: "); fields_annotations()->print_value_on(st); st->cr(); 3251 st->print(BULLET"field type annotations: "); fields_type_annotations()->print_value_on(st); st->cr(); 3252 { 3253 bool have_pv = false; 3254 // previous versions are linked together through the InstanceKlass 3255 for (InstanceKlass* pv_node = previous_versions(); 3256 pv_node != NULL; 3257 pv_node = pv_node->previous_versions()) { 3258 if (!have_pv) 3259 st->print(BULLET"previous version: "); 3260 have_pv = true; 3261 pv_node->constants()->print_value_on(st); 3262 } 3263 if (have_pv) st->cr(); 3264 } 3265 3266 if (generic_signature() != NULL) { 3267 st->print(BULLET"generic signature: "); 3268 generic_signature()->print_value_on(st); 3269 st->cr(); 3270 } 3271 st->print(BULLET"inner classes: "); inner_classes()->print_value_on(st); st->cr(); 3272 st->print(BULLET"nest members: "); nest_members()->print_value_on(st); st->cr(); 3273 if (java_mirror() != NULL) { 3274 st->print(BULLET"java mirror: "); 3275 java_mirror()->print_value_on(st); 3276 st->cr(); 3277 } else { 3278 st->print_cr(BULLET"java mirror: NULL"); 3279 } 3280 st->print(BULLET"vtable length %d (start addr: " INTPTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr(); 3281 if (vtable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_vtable(), vtable_length(), st); 3282 st->print(BULLET"itable length %d (start addr: " INTPTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr(); 3283 if (itable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_itable(), itable_length(), st); 3284 st->print_cr(BULLET"---- static fields (%d words):", static_field_size()); 3285 FieldPrinter print_static_field(st); 3286 ((InstanceKlass*)this)->do_local_static_fields(&print_static_field); 3287 st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size()); 3288 FieldPrinter print_nonstatic_field(st); 3289 InstanceKlass* ik = const_cast<InstanceKlass*>(this); 3290 ik->do_nonstatic_fields(&print_nonstatic_field); 3291 3292 st->print(BULLET"non-static oop maps: "); 3293 OopMapBlock* map = start_of_nonstatic_oop_maps(); 3294 OopMapBlock* end_map = map + nonstatic_oop_map_count(); 3295 while (map < end_map) { 3296 st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1)); 3297 map++; 3298 } 3299 st->cr(); 3300 } 3301 3302 #endif //PRODUCT 3303 3304 void InstanceKlass::print_value_on(outputStream* st) const { 3305 assert(is_klass(), "must be klass"); 3306 if (Verbose || WizardMode) access_flags().print_on(st); 3307 name()->print_value_on(st); 3308 } 3309 3310 #ifndef PRODUCT 3311 3312 void FieldPrinter::do_field(fieldDescriptor* fd) { 3313 _st->print(BULLET); 3314 if (_obj == NULL) { 3315 fd->print_on(_st); 3316 _st->cr(); 3317 } else { 3318 fd->print_on_for(_st, _obj); 3319 _st->cr(); 3320 } 3321 } 3322 3323 3324 void InstanceKlass::oop_print_on(oop obj, outputStream* st) { 3325 Klass::oop_print_on(obj, st); 3326 3327 if (this == SystemDictionary::String_klass()) { 3328 typeArrayOop value = java_lang_String::value(obj); 3329 juint length = java_lang_String::length(obj); 3330 if (value != NULL && 3331 value->is_typeArray() && 3332 length <= (juint) value->length()) { 3333 st->print(BULLET"string: "); 3334 java_lang_String::print(obj, st); 3335 st->cr(); 3336 if (!WizardMode) return; // that is enough 3337 } 3338 } 3339 3340 st->print_cr(BULLET"---- fields (total size %d words):", oop_size(obj)); 3341 FieldPrinter print_field(st, obj); 3342 do_nonstatic_fields(&print_field); 3343 3344 if (this == SystemDictionary::Class_klass()) { 3345 st->print(BULLET"signature: "); 3346 java_lang_Class::print_signature(obj, st); 3347 st->cr(); 3348 Klass* mirrored_klass = java_lang_Class::as_Klass(obj); 3349 st->print(BULLET"fake entry for mirror: "); 3350 Metadata::print_value_on_maybe_null(st, mirrored_klass); 3351 st->cr(); 3352 Klass* array_klass = java_lang_Class::array_klass_acquire(obj); 3353 st->print(BULLET"fake entry for array: "); 3354 Metadata::print_value_on_maybe_null(st, array_klass); 3355 st->cr(); 3356 st->print_cr(BULLET"fake entry for oop_size: %d", java_lang_Class::oop_size(obj)); 3357 st->print_cr(BULLET"fake entry for static_oop_field_count: %d", java_lang_Class::static_oop_field_count(obj)); 3358 Klass* real_klass = java_lang_Class::as_Klass(obj); 3359 if (real_klass != NULL && real_klass->is_instance_klass()) { 3360 InstanceKlass::cast(real_klass)->do_local_static_fields(&print_field); 3361 } 3362 } else if (this == SystemDictionary::MethodType_klass()) { 3363 st->print(BULLET"signature: "); 3364 java_lang_invoke_MethodType::print_signature(obj, st); 3365 st->cr(); 3366 } 3367 } 3368 3369 bool InstanceKlass::verify_itable_index(int i) { 3370 int method_count = klassItable::method_count_for_interface(this); 3371 assert(i >= 0 && i < method_count, "index out of bounds"); 3372 return true; 3373 } 3374 3375 #endif //PRODUCT 3376 3377 void InstanceKlass::oop_print_value_on(oop obj, outputStream* st) { 3378 st->print("a "); 3379 name()->print_value_on(st); 3380 obj->print_address_on(st); 3381 if (this == SystemDictionary::String_klass() 3382 && java_lang_String::value(obj) != NULL) { 3383 ResourceMark rm; 3384 int len = java_lang_String::length(obj); 3385 int plen = (len < 24 ? len : 12); 3386 char* str = java_lang_String::as_utf8_string(obj, 0, plen); 3387 st->print(" = \"%s\"", str); 3388 if (len > plen) 3389 st->print("...[%d]", len); 3390 } else if (this == SystemDictionary::Class_klass()) { 3391 Klass* k = java_lang_Class::as_Klass(obj); 3392 st->print(" = "); 3393 if (k != NULL) { 3394 k->print_value_on(st); 3395 } else { 3396 const char* tname = type2name(java_lang_Class::primitive_type(obj)); 3397 st->print("%s", tname ? tname : "type?"); 3398 } 3399 } else if (this == SystemDictionary::MethodType_klass()) { 3400 st->print(" = "); 3401 java_lang_invoke_MethodType::print_signature(obj, st); 3402 } else if (java_lang_boxing_object::is_instance(obj)) { 3403 st->print(" = "); 3404 java_lang_boxing_object::print(obj, st); 3405 } else if (this == SystemDictionary::LambdaForm_klass()) { 3406 oop vmentry = java_lang_invoke_LambdaForm::vmentry(obj); 3407 if (vmentry != NULL) { 3408 st->print(" => "); 3409 vmentry->print_value_on(st); 3410 } 3411 } else if (this == SystemDictionary::MemberName_klass()) { 3412 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(obj); 3413 if (vmtarget != NULL) { 3414 st->print(" = "); 3415 vmtarget->print_value_on(st); 3416 } else { 3417 java_lang_invoke_MemberName::clazz(obj)->print_value_on(st); 3418 st->print("."); 3419 java_lang_invoke_MemberName::name(obj)->print_value_on(st); 3420 } 3421 } 3422 } 3423 3424 const char* InstanceKlass::internal_name() const { 3425 return external_name(); 3426 } 3427 3428 void InstanceKlass::print_class_load_logging(ClassLoaderData* loader_data, 3429 const char* module_name, 3430 const ClassFileStream* cfs) const { 3431 if (!log_is_enabled(Info, class, load)) { 3432 return; 3433 } 3434 3435 ResourceMark rm; 3436 LogMessage(class, load) msg; 3437 stringStream info_stream; 3438 3439 // Name and class hierarchy info 3440 info_stream.print("%s", external_name()); 3441 3442 // Source 3443 if (cfs != NULL) { 3444 if (cfs->source() != NULL) { 3445 if (module_name != NULL) { 3446 // When the boot loader created the stream, it didn't know the module name 3447 // yet. Let's format it now. 3448 if (cfs->from_boot_loader_modules_image()) { 3449 info_stream.print(" source: jrt:/%s", module_name); 3450 } else { 3451 info_stream.print(" source: %s", cfs->source()); 3452 } 3453 } else { 3454 info_stream.print(" source: %s", cfs->source()); 3455 } 3456 } else if (loader_data == ClassLoaderData::the_null_class_loader_data()) { 3457 Thread* THREAD = Thread::current(); 3458 Klass* caller = 3459 THREAD->is_Java_thread() 3460 ? ((JavaThread*)THREAD)->security_get_caller_class(1) 3461 : NULL; 3462 // caller can be NULL, for example, during a JVMTI VM_Init hook 3463 if (caller != NULL) { 3464 info_stream.print(" source: instance of %s", caller->external_name()); 3465 } else { 3466 // source is unknown 3467 } 3468 } else { 3469 oop class_loader = loader_data->class_loader(); 3470 info_stream.print(" source: %s", class_loader->klass()->external_name()); 3471 } 3472 } else { 3473 assert(this->is_shared(), "must be"); 3474 if (MetaspaceShared::is_shared_dynamic((void*)this)) { 3475 info_stream.print(" source: shared objects file (top)"); 3476 } else { 3477 info_stream.print(" source: shared objects file"); 3478 } 3479 } 3480 3481 msg.info("%s", info_stream.as_string()); 3482 3483 if (log_is_enabled(Debug, class, load)) { 3484 stringStream debug_stream; 3485 3486 // Class hierarchy info 3487 debug_stream.print(" klass: " INTPTR_FORMAT " super: " INTPTR_FORMAT, 3488 p2i(this), p2i(superklass())); 3489 3490 // Interfaces 3491 if (local_interfaces() != NULL && local_interfaces()->length() > 0) { 3492 debug_stream.print(" interfaces:"); 3493 int length = local_interfaces()->length(); 3494 for (int i = 0; i < length; i++) { 3495 debug_stream.print(" " INTPTR_FORMAT, 3496 p2i(InstanceKlass::cast(local_interfaces()->at(i)))); 3497 } 3498 } 3499 3500 // Class loader 3501 debug_stream.print(" loader: ["); 3502 loader_data->print_value_on(&debug_stream); 3503 debug_stream.print("]"); 3504 3505 // Classfile checksum 3506 if (cfs) { 3507 debug_stream.print(" bytes: %d checksum: %08x", 3508 cfs->length(), 3509 ClassLoader::crc32(0, (const char*)cfs->buffer(), 3510 cfs->length())); 3511 } 3512 3513 msg.debug("%s", debug_stream.as_string()); 3514 } 3515 } 3516 3517 #if INCLUDE_SERVICES 3518 // Size Statistics 3519 void InstanceKlass::collect_statistics(KlassSizeStats *sz) const { 3520 Klass::collect_statistics(sz); 3521 3522 sz->_inst_size = wordSize * size_helper(); 3523 sz->_vtab_bytes = wordSize * vtable_length(); 3524 sz->_itab_bytes = wordSize * itable_length(); 3525 sz->_nonstatic_oopmap_bytes = wordSize * nonstatic_oop_map_size(); 3526 3527 int n = 0; 3528 n += (sz->_methods_array_bytes = sz->count_array(methods())); 3529 n += (sz->_method_ordering_bytes = sz->count_array(method_ordering())); 3530 n += (sz->_local_interfaces_bytes = sz->count_array(local_interfaces())); 3531 n += (sz->_transitive_interfaces_bytes = sz->count_array(transitive_interfaces())); 3532 n += (sz->_fields_bytes = sz->count_array(fields())); 3533 n += (sz->_inner_classes_bytes = sz->count_array(inner_classes())); 3534 n += (sz->_nest_members_bytes = sz->count_array(nest_members())); 3535 sz->_ro_bytes += n; 3536 3537 const ConstantPool* cp = constants(); 3538 if (cp) { 3539 cp->collect_statistics(sz); 3540 } 3541 3542 const Annotations* anno = annotations(); 3543 if (anno) { 3544 anno->collect_statistics(sz); 3545 } 3546 3547 const Array<Method*>* methods_array = methods(); 3548 if (methods()) { 3549 for (int i = 0; i < methods_array->length(); i++) { 3550 Method* method = methods_array->at(i); 3551 if (method) { 3552 sz->_method_count ++; 3553 method->collect_statistics(sz); 3554 } 3555 } 3556 } 3557 } 3558 #endif // INCLUDE_SERVICES 3559 3560 // Verification 3561 3562 class VerifyFieldClosure: public BasicOopIterateClosure { 3563 protected: 3564 template <class T> void do_oop_work(T* p) { 3565 oop obj = RawAccess<>::oop_load(p); 3566 if (!oopDesc::is_oop_or_null(obj)) { 3567 tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p2i(p), p2i(obj)); 3568 Universe::print_on(tty); 3569 guarantee(false, "boom"); 3570 } 3571 } 3572 public: 3573 virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); } 3574 virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); } 3575 }; 3576 3577 void InstanceKlass::verify_on(outputStream* st) { 3578 #ifndef PRODUCT 3579 // Avoid redundant verifies, this really should be in product. 3580 if (_verify_count == Universe::verify_count()) return; 3581 _verify_count = Universe::verify_count(); 3582 #endif 3583 3584 // Verify Klass 3585 Klass::verify_on(st); 3586 3587 // Verify that klass is present in ClassLoaderData 3588 guarantee(class_loader_data()->contains_klass(this), 3589 "this class isn't found in class loader data"); 3590 3591 // Verify vtables 3592 if (is_linked()) { 3593 // $$$ This used to be done only for m/s collections. Doing it 3594 // always seemed a valid generalization. (DLD -- 6/00) 3595 vtable().verify(st); 3596 } 3597 3598 // Verify first subklass 3599 if (subklass() != NULL) { 3600 guarantee(subklass()->is_klass(), "should be klass"); 3601 } 3602 3603 // Verify siblings 3604 Klass* super = this->super(); 3605 Klass* sib = next_sibling(); 3606 if (sib != NULL) { 3607 if (sib == this) { 3608 fatal("subclass points to itself " PTR_FORMAT, p2i(sib)); 3609 } 3610 3611 guarantee(sib->is_klass(), "should be klass"); 3612 guarantee(sib->super() == super, "siblings should have same superklass"); 3613 } 3614 3615 // Verify local interfaces 3616 if (local_interfaces()) { 3617 Array<InstanceKlass*>* local_interfaces = this->local_interfaces(); 3618 for (int j = 0; j < local_interfaces->length(); j++) { 3619 InstanceKlass* e = local_interfaces->at(j); 3620 guarantee(e->is_klass() && e->is_interface(), "invalid local interface"); 3621 } 3622 } 3623 3624 // Verify transitive interfaces 3625 if (transitive_interfaces() != NULL) { 3626 Array<InstanceKlass*>* transitive_interfaces = this->transitive_interfaces(); 3627 for (int j = 0; j < transitive_interfaces->length(); j++) { 3628 InstanceKlass* e = transitive_interfaces->at(j); 3629 guarantee(e->is_klass() && e->is_interface(), "invalid transitive interface"); 3630 } 3631 } 3632 3633 // Verify methods 3634 if (methods() != NULL) { 3635 Array<Method*>* methods = this->methods(); 3636 for (int j = 0; j < methods->length(); j++) { 3637 guarantee(methods->at(j)->is_method(), "non-method in methods array"); 3638 } 3639 for (int j = 0; j < methods->length() - 1; j++) { 3640 Method* m1 = methods->at(j); 3641 Method* m2 = methods->at(j + 1); 3642 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly"); 3643 } 3644 } 3645 3646 // Verify method ordering 3647 if (method_ordering() != NULL) { 3648 Array<int>* method_ordering = this->method_ordering(); 3649 int length = method_ordering->length(); 3650 if (JvmtiExport::can_maintain_original_method_order() || 3651 ((UseSharedSpaces || Arguments::is_dumping_archive()) && length != 0)) { 3652 guarantee(length == methods()->length(), "invalid method ordering length"); 3653 jlong sum = 0; 3654 for (int j = 0; j < length; j++) { 3655 int original_index = method_ordering->at(j); 3656 guarantee(original_index >= 0, "invalid method ordering index"); 3657 guarantee(original_index < length, "invalid method ordering index"); 3658 sum += original_index; 3659 } 3660 // Verify sum of indices 0,1,...,length-1 3661 guarantee(sum == ((jlong)length*(length-1))/2, "invalid method ordering sum"); 3662 } else { 3663 guarantee(length == 0, "invalid method ordering length"); 3664 } 3665 } 3666 3667 // Verify default methods 3668 if (default_methods() != NULL) { 3669 Array<Method*>* methods = this->default_methods(); 3670 for (int j = 0; j < methods->length(); j++) { 3671 guarantee(methods->at(j)->is_method(), "non-method in methods array"); 3672 } 3673 for (int j = 0; j < methods->length() - 1; j++) { 3674 Method* m1 = methods->at(j); 3675 Method* m2 = methods->at(j + 1); 3676 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly"); 3677 } 3678 } 3679 3680 // Verify JNI static field identifiers 3681 if (jni_ids() != NULL) { 3682 jni_ids()->verify(this); 3683 } 3684 3685 // Verify other fields 3686 if (array_klasses() != NULL) { 3687 guarantee(array_klasses()->is_klass(), "should be klass"); 3688 } 3689 if (constants() != NULL) { 3690 guarantee(constants()->is_constantPool(), "should be constant pool"); 3691 } 3692 const Klass* anonymous_host = unsafe_anonymous_host(); 3693 if (anonymous_host != NULL) { 3694 guarantee(anonymous_host->is_klass(), "should be klass"); 3695 } 3696 } 3697 3698 void InstanceKlass::oop_verify_on(oop obj, outputStream* st) { 3699 Klass::oop_verify_on(obj, st); 3700 VerifyFieldClosure blk; 3701 obj->oop_iterate(&blk); 3702 } 3703 3704 3705 // JNIid class for jfieldIDs only 3706 // Note to reviewers: 3707 // These JNI functions are just moved over to column 1 and not changed 3708 // in the compressed oops workspace. 3709 JNIid::JNIid(Klass* holder, int offset, JNIid* next) { 3710 _holder = holder; 3711 _offset = offset; 3712 _next = next; 3713 debug_only(_is_static_field_id = false;) 3714 } 3715 3716 3717 JNIid* JNIid::find(int offset) { 3718 JNIid* current = this; 3719 while (current != NULL) { 3720 if (current->offset() == offset) return current; 3721 current = current->next(); 3722 } 3723 return NULL; 3724 } 3725 3726 void JNIid::deallocate(JNIid* current) { 3727 while (current != NULL) { 3728 JNIid* next = current->next(); 3729 delete current; 3730 current = next; 3731 } 3732 } 3733 3734 3735 void JNIid::verify(Klass* holder) { 3736 int first_field_offset = InstanceMirrorKlass::offset_of_static_fields(); 3737 int end_field_offset; 3738 end_field_offset = first_field_offset + (InstanceKlass::cast(holder)->static_field_size() * wordSize); 3739 3740 JNIid* current = this; 3741 while (current != NULL) { 3742 guarantee(current->holder() == holder, "Invalid klass in JNIid"); 3743 #ifdef ASSERT 3744 int o = current->offset(); 3745 if (current->is_static_field_id()) { 3746 guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid"); 3747 } 3748 #endif 3749 current = current->next(); 3750 } 3751 } 3752 3753 void InstanceKlass::set_init_state(ClassState state) { 3754 #ifdef ASSERT 3755 bool good_state = is_shared() ? (_init_state <= state) 3756 : (_init_state < state); 3757 assert(good_state || state == allocated, "illegal state transition"); 3758 #endif 3759 assert(_init_thread == NULL, "should be cleared before state change"); 3760 _init_state = (u1)state; 3761 } 3762 3763 #if INCLUDE_JVMTI 3764 3765 // RedefineClasses() support for previous versions 3766 3767 // Globally, there is at least one previous version of a class to walk 3768 // during class unloading, which is saved because old methods in the class 3769 // are still running. Otherwise the previous version list is cleaned up. 3770 bool InstanceKlass::_has_previous_versions = false; 3771 3772 // Returns true if there are previous versions of a class for class 3773 // unloading only. Also resets the flag to false. purge_previous_version 3774 // will set the flag to true if there are any left, i.e., if there's any 3775 // work to do for next time. This is to avoid the expensive code cache 3776 // walk in CLDG::clean_deallocate_lists(). 3777 bool InstanceKlass::has_previous_versions_and_reset() { 3778 bool ret = _has_previous_versions; 3779 log_trace(redefine, class, iklass, purge)("Class unloading: has_previous_versions = %s", 3780 ret ? "true" : "false"); 3781 _has_previous_versions = false; 3782 return ret; 3783 } 3784 3785 // Purge previous versions before adding new previous versions of the class and 3786 // during class unloading. 3787 void InstanceKlass::purge_previous_version_list() { 3788 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); 3789 assert(has_been_redefined(), "Should only be called for main class"); 3790 3791 // Quick exit. 3792 if (previous_versions() == NULL) { 3793 return; 3794 } 3795 3796 // This klass has previous versions so see what we can cleanup 3797 // while it is safe to do so. 3798 3799 int deleted_count = 0; // leave debugging breadcrumbs 3800 int live_count = 0; 3801 ClassLoaderData* loader_data = class_loader_data(); 3802 assert(loader_data != NULL, "should never be null"); 3803 3804 ResourceMark rm; 3805 log_trace(redefine, class, iklass, purge)("%s: previous versions", external_name()); 3806 3807 // previous versions are linked together through the InstanceKlass 3808 InstanceKlass* pv_node = previous_versions(); 3809 InstanceKlass* last = this; 3810 int version = 0; 3811 3812 // check the previous versions list 3813 for (; pv_node != NULL; ) { 3814 3815 ConstantPool* pvcp = pv_node->constants(); 3816 assert(pvcp != NULL, "cp ref was unexpectedly cleared"); 3817 3818 if (!pvcp->on_stack()) { 3819 // If the constant pool isn't on stack, none of the methods 3820 // are executing. Unlink this previous_version. 3821 // The previous version InstanceKlass is on the ClassLoaderData deallocate list 3822 // so will be deallocated during the next phase of class unloading. 3823 log_trace(redefine, class, iklass, purge) 3824 ("previous version " INTPTR_FORMAT " is dead.", p2i(pv_node)); 3825 // For debugging purposes. 3826 pv_node->set_is_scratch_class(); 3827 // Unlink from previous version list. 3828 assert(pv_node->class_loader_data() == loader_data, "wrong loader_data"); 3829 InstanceKlass* next = pv_node->previous_versions(); 3830 pv_node->link_previous_versions(NULL); // point next to NULL 3831 last->link_previous_versions(next); 3832 // Add to the deallocate list after unlinking 3833 loader_data->add_to_deallocate_list(pv_node); 3834 pv_node = next; 3835 deleted_count++; 3836 version++; 3837 continue; 3838 } else { 3839 log_trace(redefine, class, iklass, purge)("previous version " INTPTR_FORMAT " is alive", p2i(pv_node)); 3840 assert(pvcp->pool_holder() != NULL, "Constant pool with no holder"); 3841 guarantee (!loader_data->is_unloading(), "unloaded classes can't be on the stack"); 3842 live_count++; 3843 // found a previous version for next time we do class unloading 3844 _has_previous_versions = true; 3845 } 3846 3847 // At least one method is live in this previous version. 3848 // Reset dead EMCP methods not to get breakpoints. 3849 // All methods are deallocated when all of the methods for this class are no 3850 // longer running. 3851 Array<Method*>* method_refs = pv_node->methods(); 3852 if (method_refs != NULL) { 3853 log_trace(redefine, class, iklass, purge)("previous methods length=%d", method_refs->length()); 3854 for (int j = 0; j < method_refs->length(); j++) { 3855 Method* method = method_refs->at(j); 3856 3857 if (!method->on_stack()) { 3858 // no breakpoints for non-running methods 3859 if (method->is_running_emcp()) { 3860 method->set_running_emcp(false); 3861 } 3862 } else { 3863 assert (method->is_obsolete() || method->is_running_emcp(), 3864 "emcp method cannot run after emcp bit is cleared"); 3865 log_trace(redefine, class, iklass, purge) 3866 ("purge: %s(%s): prev method @%d in version @%d is alive", 3867 method->name()->as_C_string(), method->signature()->as_C_string(), j, version); 3868 } 3869 } 3870 } 3871 // next previous version 3872 last = pv_node; 3873 pv_node = pv_node->previous_versions(); 3874 version++; 3875 } 3876 log_trace(redefine, class, iklass, purge) 3877 ("previous version stats: live=%d, deleted=%d", live_count, deleted_count); 3878 } 3879 3880 void InstanceKlass::mark_newly_obsolete_methods(Array<Method*>* old_methods, 3881 int emcp_method_count) { 3882 int obsolete_method_count = old_methods->length() - emcp_method_count; 3883 3884 if (emcp_method_count != 0 && obsolete_method_count != 0 && 3885 _previous_versions != NULL) { 3886 // We have a mix of obsolete and EMCP methods so we have to 3887 // clear out any matching EMCP method entries the hard way. 3888 int local_count = 0; 3889 for (int i = 0; i < old_methods->length(); i++) { 3890 Method* old_method = old_methods->at(i); 3891 if (old_method->is_obsolete()) { 3892 // only obsolete methods are interesting 3893 Symbol* m_name = old_method->name(); 3894 Symbol* m_signature = old_method->signature(); 3895 3896 // previous versions are linked together through the InstanceKlass 3897 int j = 0; 3898 for (InstanceKlass* prev_version = _previous_versions; 3899 prev_version != NULL; 3900 prev_version = prev_version->previous_versions(), j++) { 3901 3902 Array<Method*>* method_refs = prev_version->methods(); 3903 for (int k = 0; k < method_refs->length(); k++) { 3904 Method* method = method_refs->at(k); 3905 3906 if (!method->is_obsolete() && 3907 method->name() == m_name && 3908 method->signature() == m_signature) { 3909 // The current RedefineClasses() call has made all EMCP 3910 // versions of this method obsolete so mark it as obsolete 3911 log_trace(redefine, class, iklass, add) 3912 ("%s(%s): flush obsolete method @%d in version @%d", 3913 m_name->as_C_string(), m_signature->as_C_string(), k, j); 3914 3915 method->set_is_obsolete(); 3916 break; 3917 } 3918 } 3919 3920 // The previous loop may not find a matching EMCP method, but 3921 // that doesn't mean that we can optimize and not go any 3922 // further back in the PreviousVersion generations. The EMCP 3923 // method for this generation could have already been made obsolete, 3924 // but there still may be an older EMCP method that has not 3925 // been made obsolete. 3926 } 3927 3928 if (++local_count >= obsolete_method_count) { 3929 // no more obsolete methods so bail out now 3930 break; 3931 } 3932 } 3933 } 3934 } 3935 } 3936 3937 // Save the scratch_class as the previous version if any of the methods are running. 3938 // The previous_versions are used to set breakpoints in EMCP methods and they are 3939 // also used to clean MethodData links to redefined methods that are no longer running. 3940 void InstanceKlass::add_previous_version(InstanceKlass* scratch_class, 3941 int emcp_method_count) { 3942 assert(Thread::current()->is_VM_thread(), 3943 "only VMThread can add previous versions"); 3944 3945 ResourceMark rm; 3946 log_trace(redefine, class, iklass, add) 3947 ("adding previous version ref for %s, EMCP_cnt=%d", scratch_class->external_name(), emcp_method_count); 3948 3949 // Clean out old previous versions for this class 3950 purge_previous_version_list(); 3951 3952 // Mark newly obsolete methods in remaining previous versions. An EMCP method from 3953 // a previous redefinition may be made obsolete by this redefinition. 3954 Array<Method*>* old_methods = scratch_class->methods(); 3955 mark_newly_obsolete_methods(old_methods, emcp_method_count); 3956 3957 // If the constant pool for this previous version of the class 3958 // is not marked as being on the stack, then none of the methods 3959 // in this previous version of the class are on the stack so 3960 // we don't need to add this as a previous version. 3961 ConstantPool* cp_ref = scratch_class->constants(); 3962 if (!cp_ref->on_stack()) { 3963 log_trace(redefine, class, iklass, add)("scratch class not added; no methods are running"); 3964 // For debugging purposes. 3965 scratch_class->set_is_scratch_class(); 3966 scratch_class->class_loader_data()->add_to_deallocate_list(scratch_class); 3967 return; 3968 } 3969 3970 if (emcp_method_count != 0) { 3971 // At least one method is still running, check for EMCP methods 3972 for (int i = 0; i < old_methods->length(); i++) { 3973 Method* old_method = old_methods->at(i); 3974 if (!old_method->is_obsolete() && old_method->on_stack()) { 3975 // if EMCP method (not obsolete) is on the stack, mark as EMCP so that 3976 // we can add breakpoints for it. 3977 3978 // We set the method->on_stack bit during safepoints for class redefinition 3979 // and use this bit to set the is_running_emcp bit. 3980 // After the safepoint, the on_stack bit is cleared and the running emcp 3981 // method may exit. If so, we would set a breakpoint in a method that 3982 // is never reached, but this won't be noticeable to the programmer. 3983 old_method->set_running_emcp(true); 3984 log_trace(redefine, class, iklass, add) 3985 ("EMCP method %s is on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method)); 3986 } else if (!old_method->is_obsolete()) { 3987 log_trace(redefine, class, iklass, add) 3988 ("EMCP method %s is NOT on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method)); 3989 } 3990 } 3991 } 3992 3993 // Add previous version if any methods are still running. 3994 // Set has_previous_version flag for processing during class unloading. 3995 _has_previous_versions = true; 3996 log_trace(redefine, class, iklass, add) ("scratch class added; one of its methods is on_stack."); 3997 assert(scratch_class->previous_versions() == NULL, "shouldn't have a previous version"); 3998 scratch_class->link_previous_versions(previous_versions()); 3999 link_previous_versions(scratch_class); 4000 } // end add_previous_version() 4001 4002 #endif // INCLUDE_JVMTI 4003 4004 Method* InstanceKlass::method_with_idnum(int idnum) { 4005 Method* m = NULL; 4006 if (idnum < methods()->length()) { 4007 m = methods()->at(idnum); 4008 } 4009 if (m == NULL || m->method_idnum() != idnum) { 4010 for (int index = 0; index < methods()->length(); ++index) { 4011 m = methods()->at(index); 4012 if (m->method_idnum() == idnum) { 4013 return m; 4014 } 4015 } 4016 // None found, return null for the caller to handle. 4017 return NULL; 4018 } 4019 return m; 4020 } 4021 4022 4023 Method* InstanceKlass::method_with_orig_idnum(int idnum) { 4024 if (idnum >= methods()->length()) { 4025 return NULL; 4026 } 4027 Method* m = methods()->at(idnum); 4028 if (m != NULL && m->orig_method_idnum() == idnum) { 4029 return m; 4030 } 4031 // Obsolete method idnum does not match the original idnum 4032 for (int index = 0; index < methods()->length(); ++index) { 4033 m = methods()->at(index); 4034 if (m->orig_method_idnum() == idnum) { 4035 return m; 4036 } 4037 } 4038 // None found, return null for the caller to handle. 4039 return NULL; 4040 } 4041 4042 4043 Method* InstanceKlass::method_with_orig_idnum(int idnum, int version) { 4044 InstanceKlass* holder = get_klass_version(version); 4045 if (holder == NULL) { 4046 return NULL; // The version of klass is gone, no method is found 4047 } 4048 Method* method = holder->method_with_orig_idnum(idnum); 4049 return method; 4050 } 4051 4052 #if INCLUDE_JVMTI 4053 JvmtiCachedClassFileData* InstanceKlass::get_cached_class_file() { 4054 return _cached_class_file; 4055 } 4056 4057 jint InstanceKlass::get_cached_class_file_len() { 4058 return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file); 4059 } 4060 4061 unsigned char * InstanceKlass::get_cached_class_file_bytes() { 4062 return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file); 4063 } 4064 #endif