1 /* 2 * Copyright (c) 1997, 2018, 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/systemDictionary.hpp" 35 #include "classfile/systemDictionaryShared.hpp" 36 #include "classfile/verifier.hpp" 37 #include "classfile/vmSymbols.hpp" 38 #include "code/dependencyContext.hpp" 39 #include "compiler/compileBroker.hpp" 40 #include "gc/shared/collectedHeap.inline.hpp" 41 #include "gc/shared/specialized_oop_closures.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 "oops/fieldStreams.hpp" 57 #include "oops/instanceClassLoaderKlass.hpp" 58 #include "oops/instanceKlass.inline.hpp" 59 #include "oops/instanceMirrorKlass.hpp" 60 #include "oops/instanceOop.hpp" 61 #include "oops/klass.inline.hpp" 62 #include "oops/method.hpp" 63 #include "oops/oop.inline.hpp" 64 #include "oops/symbol.hpp" 65 #include "prims/jvmtiExport.hpp" 66 #include "prims/jvmtiRedefineClasses.hpp" 67 #include "prims/jvmtiThreadState.hpp" 68 #include "prims/methodComparator.hpp" 69 #include "runtime/atomic.hpp" 70 #include "runtime/fieldDescriptor.hpp" 71 #include "runtime/handles.inline.hpp" 72 #include "runtime/javaCalls.hpp" 73 #include "runtime/mutexLocker.hpp" 74 #include "runtime/orderAccess.inline.hpp" 75 #include "runtime/thread.inline.hpp" 76 #include "services/classLoadingService.hpp" 77 #include "services/threadService.hpp" 78 #include "utilities/dtrace.hpp" 79 #include "utilities/macros.hpp" 80 #include "utilities/stringUtils.hpp" 81 #ifdef COMPILER1 82 #include "c1/c1_Compiler.hpp" 83 #endif 84 85 #ifdef DTRACE_ENABLED 86 87 88 #define HOTSPOT_CLASS_INITIALIZATION_required HOTSPOT_CLASS_INITIALIZATION_REQUIRED 89 #define HOTSPOT_CLASS_INITIALIZATION_recursive HOTSPOT_CLASS_INITIALIZATION_RECURSIVE 90 #define HOTSPOT_CLASS_INITIALIZATION_concurrent HOTSPOT_CLASS_INITIALIZATION_CONCURRENT 91 #define HOTSPOT_CLASS_INITIALIZATION_erroneous HOTSPOT_CLASS_INITIALIZATION_ERRONEOUS 92 #define HOTSPOT_CLASS_INITIALIZATION_super__failed HOTSPOT_CLASS_INITIALIZATION_SUPER_FAILED 93 #define HOTSPOT_CLASS_INITIALIZATION_clinit HOTSPOT_CLASS_INITIALIZATION_CLINIT 94 #define HOTSPOT_CLASS_INITIALIZATION_error HOTSPOT_CLASS_INITIALIZATION_ERROR 95 #define HOTSPOT_CLASS_INITIALIZATION_end HOTSPOT_CLASS_INITIALIZATION_END 96 #define DTRACE_CLASSINIT_PROBE(type, thread_type) \ 97 { \ 98 char* data = NULL; \ 99 int len = 0; \ 100 Symbol* clss_name = name(); \ 101 if (clss_name != NULL) { \ 102 data = (char*)clss_name->bytes(); \ 103 len = clss_name->utf8_length(); \ 104 } \ 105 HOTSPOT_CLASS_INITIALIZATION_##type( \ 106 data, len, (void*)class_loader(), thread_type); \ 107 } 108 109 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait) \ 110 { \ 111 char* data = NULL; \ 112 int len = 0; \ 113 Symbol* clss_name = name(); \ 114 if (clss_name != NULL) { \ 115 data = (char*)clss_name->bytes(); \ 116 len = clss_name->utf8_length(); \ 117 } \ 118 HOTSPOT_CLASS_INITIALIZATION_##type( \ 119 data, len, (void*)class_loader(), thread_type, wait); \ 120 } 121 122 #else // ndef DTRACE_ENABLED 123 124 #define DTRACE_CLASSINIT_PROBE(type, thread_type) 125 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait) 126 127 #endif // ndef DTRACE_ENABLED 128 129 static inline bool is_class_loader(const Symbol* class_name, 130 const ClassFileParser& parser) { 131 assert(class_name != NULL, "invariant"); 132 133 if (class_name == vmSymbols::java_lang_ClassLoader()) { 134 return true; 135 } 136 137 if (SystemDictionary::ClassLoader_klass_loaded()) { 138 const Klass* const super_klass = parser.super_klass(); 139 if (super_klass != NULL) { 140 if (super_klass->is_subtype_of(SystemDictionary::ClassLoader_klass())) { 141 return true; 142 } 143 } 144 } 145 return false; 146 } 147 148 InstanceKlass* InstanceKlass::allocate_instance_klass(const ClassFileParser& parser, TRAPS) { 149 const int size = InstanceKlass::size(parser.vtable_size(), 150 parser.itable_size(), 151 nonstatic_oop_map_size(parser.total_oop_map_count()), 152 parser.is_interface(), 153 parser.is_anonymous(), 154 should_store_fingerprint(parser.is_anonymous())); 155 156 const Symbol* const class_name = parser.class_name(); 157 assert(class_name != NULL, "invariant"); 158 ClassLoaderData* loader_data = parser.loader_data(); 159 assert(loader_data != NULL, "invariant"); 160 161 InstanceKlass* ik; 162 163 // Allocation 164 if (REF_NONE == parser.reference_type()) { 165 if (class_name == vmSymbols::java_lang_Class()) { 166 // mirror 167 ik = new (loader_data, size, THREAD) InstanceMirrorKlass(parser); 168 } 169 else if (is_class_loader(class_name, parser)) { 170 // class loader 171 ik = new (loader_data, size, THREAD) InstanceClassLoaderKlass(parser); 172 } 173 else { 174 // normal 175 ik = new (loader_data, size, THREAD) InstanceKlass(parser, InstanceKlass::_misc_kind_other); 176 } 177 } 178 else { 179 // reference 180 ik = new (loader_data, size, THREAD) InstanceRefKlass(parser); 181 } 182 183 // Check for pending exception before adding to the loader data and incrementing 184 // class count. Can get OOM here. 185 if (HAS_PENDING_EXCEPTION) { 186 return NULL; 187 } 188 189 return ik; 190 } 191 192 193 // copy method ordering from resource area to Metaspace 194 void InstanceKlass::copy_method_ordering(const intArray* m, TRAPS) { 195 if (m != NULL) { 196 // allocate a new array and copy contents (memcpy?) 197 _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK); 198 for (int i = 0; i < m->length(); i++) { 199 _method_ordering->at_put(i, m->at(i)); 200 } 201 } else { 202 _method_ordering = Universe::the_empty_int_array(); 203 } 204 } 205 206 // create a new array of vtable_indices for default methods 207 Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) { 208 Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL); 209 assert(default_vtable_indices() == NULL, "only create once"); 210 set_default_vtable_indices(vtable_indices); 211 return vtable_indices; 212 } 213 214 InstanceKlass::InstanceKlass(const ClassFileParser& parser, unsigned kind) : 215 _static_field_size(parser.static_field_size()), 216 _nonstatic_oop_map_size(nonstatic_oop_map_size(parser.total_oop_map_count())), 217 _itable_len(parser.itable_size()), 218 _reference_type(parser.reference_type()) { 219 set_vtable_length(parser.vtable_size()); 220 set_kind(kind); 221 set_access_flags(parser.access_flags()); 222 set_is_anonymous(parser.is_anonymous()); 223 set_layout_helper(Klass::instance_layout_helper(parser.layout_size(), 224 false)); 225 226 assert(NULL == _methods, "underlying memory not zeroed?"); 227 assert(is_instance_klass(), "is layout incorrect?"); 228 assert(size_helper() == parser.layout_size(), "incorrect size_helper?"); 229 } 230 231 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data, 232 Array<Method*>* methods) { 233 if (methods != NULL && methods != Universe::the_empty_method_array() && 234 !methods->is_shared()) { 235 for (int i = 0; i < methods->length(); i++) { 236 Method* method = methods->at(i); 237 if (method == NULL) continue; // maybe null if error processing 238 // Only want to delete methods that are not executing for RedefineClasses. 239 // The previous version will point to them so they're not totally dangling 240 assert (!method->on_stack(), "shouldn't be called with methods on stack"); 241 MetadataFactory::free_metadata(loader_data, method); 242 } 243 MetadataFactory::free_array<Method*>(loader_data, methods); 244 } 245 } 246 247 void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data, 248 const Klass* super_klass, 249 Array<Klass*>* local_interfaces, 250 Array<Klass*>* transitive_interfaces) { 251 // Only deallocate transitive interfaces if not empty, same as super class 252 // or same as local interfaces. See code in parseClassFile. 253 Array<Klass*>* ti = transitive_interfaces; 254 if (ti != Universe::the_empty_klass_array() && ti != local_interfaces) { 255 // check that the interfaces don't come from super class 256 Array<Klass*>* sti = (super_klass == NULL) ? NULL : 257 InstanceKlass::cast(super_klass)->transitive_interfaces(); 258 if (ti != sti && ti != NULL && !ti->is_shared()) { 259 MetadataFactory::free_array<Klass*>(loader_data, ti); 260 } 261 } 262 263 // local interfaces can be empty 264 if (local_interfaces != Universe::the_empty_klass_array() && 265 local_interfaces != NULL && !local_interfaces->is_shared()) { 266 MetadataFactory::free_array<Klass*>(loader_data, local_interfaces); 267 } 268 } 269 270 // This function deallocates the metadata and C heap pointers that the 271 // InstanceKlass points to. 272 void InstanceKlass::deallocate_contents(ClassLoaderData* loader_data) { 273 274 // Orphan the mirror first, CMS thinks it's still live. 275 if (java_mirror() != NULL) { 276 java_lang_Class::set_klass(java_mirror(), NULL); 277 } 278 279 // Also remove mirror from handles 280 loader_data->remove_handle(_java_mirror); 281 282 // Need to take this class off the class loader data list. 283 loader_data->remove_class(this); 284 285 // The array_klass for this class is created later, after error handling. 286 // For class redefinition, we keep the original class so this scratch class 287 // doesn't have an array class. Either way, assert that there is nothing 288 // to deallocate. 289 assert(array_klasses() == NULL, "array classes shouldn't be created for this class yet"); 290 291 // Release C heap allocated data that this might point to, which includes 292 // reference counting symbol names. 293 release_C_heap_structures(); 294 295 deallocate_methods(loader_data, methods()); 296 set_methods(NULL); 297 298 if (method_ordering() != NULL && 299 method_ordering() != Universe::the_empty_int_array() && 300 !method_ordering()->is_shared()) { 301 MetadataFactory::free_array<int>(loader_data, method_ordering()); 302 } 303 set_method_ordering(NULL); 304 305 // default methods can be empty 306 if (default_methods() != NULL && 307 default_methods() != Universe::the_empty_method_array() && 308 !default_methods()->is_shared()) { 309 MetadataFactory::free_array<Method*>(loader_data, default_methods()); 310 } 311 // Do NOT deallocate the default methods, they are owned by superinterfaces. 312 set_default_methods(NULL); 313 314 // default methods vtable indices can be empty 315 if (default_vtable_indices() != NULL && 316 !default_vtable_indices()->is_shared()) { 317 MetadataFactory::free_array<int>(loader_data, default_vtable_indices()); 318 } 319 set_default_vtable_indices(NULL); 320 321 322 // This array is in Klass, but remove it with the InstanceKlass since 323 // this place would be the only caller and it can share memory with transitive 324 // interfaces. 325 if (secondary_supers() != NULL && 326 secondary_supers() != Universe::the_empty_klass_array() && 327 secondary_supers() != transitive_interfaces() && 328 !secondary_supers()->is_shared()) { 329 MetadataFactory::free_array<Klass*>(loader_data, secondary_supers()); 330 } 331 set_secondary_supers(NULL); 332 333 deallocate_interfaces(loader_data, super(), local_interfaces(), transitive_interfaces()); 334 set_transitive_interfaces(NULL); 335 set_local_interfaces(NULL); 336 337 if (fields() != NULL && !fields()->is_shared()) { 338 MetadataFactory::free_array<jushort>(loader_data, fields()); 339 } 340 set_fields(NULL, 0); 341 342 // If a method from a redefined class is using this constant pool, don't 343 // delete it, yet. The new class's previous version will point to this. 344 if (constants() != NULL) { 345 assert (!constants()->on_stack(), "shouldn't be called if anything is onstack"); 346 if (!constants()->is_shared()) { 347 MetadataFactory::free_metadata(loader_data, constants()); 348 } 349 // Delete any cached resolution errors for the constant pool 350 SystemDictionary::delete_resolution_error(constants()); 351 352 set_constants(NULL); 353 } 354 355 if (inner_classes() != NULL && 356 inner_classes() != Universe::the_empty_short_array() && 357 !inner_classes()->is_shared()) { 358 MetadataFactory::free_array<jushort>(loader_data, inner_classes()); 359 } 360 set_inner_classes(NULL); 361 362 // We should deallocate the Annotations instance if it's not in shared spaces. 363 if (annotations() != NULL && !annotations()->is_shared()) { 364 MetadataFactory::free_metadata(loader_data, annotations()); 365 } 366 set_annotations(NULL); 367 } 368 369 bool InstanceKlass::should_be_initialized() const { 370 return !is_initialized(); 371 } 372 373 klassItable InstanceKlass::itable() const { 374 return klassItable(const_cast<InstanceKlass*>(this)); 375 } 376 377 void InstanceKlass::eager_initialize(Thread *thread) { 378 if (!EagerInitialization) return; 379 380 if (this->is_not_initialized()) { 381 // abort if the the class has a class initializer 382 if (this->class_initializer() != NULL) return; 383 384 // abort if it is java.lang.Object (initialization is handled in genesis) 385 Klass* super_klass = super(); 386 if (super_klass == NULL) return; 387 388 // abort if the super class should be initialized 389 if (!InstanceKlass::cast(super_klass)->is_initialized()) return; 390 391 // call body to expose the this pointer 392 eager_initialize_impl(); 393 } 394 } 395 396 // JVMTI spec thinks there are signers and protection domain in the 397 // instanceKlass. These accessors pretend these fields are there. 398 // The hprof specification also thinks these fields are in InstanceKlass. 399 oop InstanceKlass::protection_domain() const { 400 // return the protection_domain from the mirror 401 return java_lang_Class::protection_domain(java_mirror()); 402 } 403 404 // To remove these from requires an incompatible change and CCC request. 405 objArrayOop InstanceKlass::signers() const { 406 // return the signers from the mirror 407 return java_lang_Class::signers(java_mirror()); 408 } 409 410 oop InstanceKlass::init_lock() const { 411 // return the init lock from the mirror 412 oop lock = java_lang_Class::init_lock(java_mirror()); 413 // Prevent reordering with any access of initialization state 414 OrderAccess::loadload(); 415 assert((oop)lock != NULL || !is_not_initialized(), // initialized or in_error state 416 "only fully initialized state can have a null lock"); 417 return lock; 418 } 419 420 // Set the initialization lock to null so the object can be GC'ed. Any racing 421 // threads to get this lock will see a null lock and will not lock. 422 // That's okay because they all check for initialized state after getting 423 // the lock and return. 424 void InstanceKlass::fence_and_clear_init_lock() { 425 // make sure previous stores are all done, notably the init_state. 426 OrderAccess::storestore(); 427 java_lang_Class::set_init_lock(java_mirror(), NULL); 428 assert(!is_not_initialized(), "class must be initialized now"); 429 } 430 431 void InstanceKlass::eager_initialize_impl() { 432 EXCEPTION_MARK; 433 HandleMark hm(THREAD); 434 Handle h_init_lock(THREAD, init_lock()); 435 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL); 436 437 // abort if someone beat us to the initialization 438 if (!is_not_initialized()) return; // note: not equivalent to is_initialized() 439 440 ClassState old_state = init_state(); 441 link_class_impl(true, THREAD); 442 if (HAS_PENDING_EXCEPTION) { 443 CLEAR_PENDING_EXCEPTION; 444 // Abort if linking the class throws an exception. 445 446 // Use a test to avoid redundantly resetting the state if there's 447 // no change. Set_init_state() asserts that state changes make 448 // progress, whereas here we might just be spinning in place. 449 if (old_state != _init_state) 450 set_init_state(old_state); 451 } else { 452 // linking successfull, mark class as initialized 453 set_init_state(fully_initialized); 454 fence_and_clear_init_lock(); 455 // trace 456 if (log_is_enabled(Info, class, init)) { 457 ResourceMark rm(THREAD); 458 log_info(class, init)("[Initialized %s without side effects]", external_name()); 459 } 460 } 461 } 462 463 464 // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization 465 // process. The step comments refers to the procedure described in that section. 466 // Note: implementation moved to static method to expose the this pointer. 467 void InstanceKlass::initialize(TRAPS) { 468 if (this->should_be_initialized()) { 469 initialize_impl(CHECK); 470 // Note: at this point the class may be initialized 471 // OR it may be in the state of being initialized 472 // in case of recursive initialization! 473 } else { 474 assert(is_initialized(), "sanity check"); 475 } 476 } 477 478 479 bool InstanceKlass::verify_code(bool throw_verifyerror, TRAPS) { 480 // 1) Verify the bytecodes 481 Verifier::Mode mode = 482 throw_verifyerror ? Verifier::ThrowException : Verifier::NoException; 483 return Verifier::verify(this, mode, should_verify_class(), THREAD); 484 } 485 486 487 // Used exclusively by the shared spaces dump mechanism to prevent 488 // classes mapped into the shared regions in new VMs from appearing linked. 489 490 void InstanceKlass::unlink_class() { 491 assert(is_linked(), "must be linked"); 492 _init_state = loaded; 493 } 494 495 void InstanceKlass::link_class(TRAPS) { 496 assert(is_loaded(), "must be loaded"); 497 if (!is_linked()) { 498 link_class_impl(true, CHECK); 499 } 500 } 501 502 // Called to verify that a class can link during initialization, without 503 // throwing a VerifyError. 504 bool InstanceKlass::link_class_or_fail(TRAPS) { 505 assert(is_loaded(), "must be loaded"); 506 if (!is_linked()) { 507 link_class_impl(false, CHECK_false); 508 } 509 return is_linked(); 510 } 511 512 bool InstanceKlass::link_class_impl(bool throw_verifyerror, TRAPS) { 513 if (DumpSharedSpaces && is_in_error_state()) { 514 // This is for CDS dumping phase only -- we use the in_error_state to indicate that 515 // the class has failed verification. Throwing the NoClassDefFoundError here is just 516 // a convenient way to stop repeat attempts to verify the same (bad) class. 517 // 518 // Note that the NoClassDefFoundError is not part of the JLS, and should not be thrown 519 // if we are executing Java code. This is not a problem for CDS dumping phase since 520 // it doesn't execute any Java code. 521 ResourceMark rm(THREAD); 522 Exceptions::fthrow(THREAD_AND_LOCATION, 523 vmSymbols::java_lang_NoClassDefFoundError(), 524 "Class %s, or one of its supertypes, failed class initialization", 525 external_name()); 526 return false; 527 } 528 // return if already verified 529 if (is_linked()) { 530 return true; 531 } 532 533 // Timing 534 // timer handles recursion 535 assert(THREAD->is_Java_thread(), "non-JavaThread in link_class_impl"); 536 JavaThread* jt = (JavaThread*)THREAD; 537 538 // link super class before linking this class 539 Klass* super_klass = super(); 540 if (super_klass != NULL) { 541 if (super_klass->is_interface()) { // check if super class is an interface 542 ResourceMark rm(THREAD); 543 Exceptions::fthrow( 544 THREAD_AND_LOCATION, 545 vmSymbols::java_lang_IncompatibleClassChangeError(), 546 "class %s has interface %s as super class", 547 external_name(), 548 super_klass->external_name() 549 ); 550 return false; 551 } 552 553 InstanceKlass* ik_super = InstanceKlass::cast(super_klass); 554 ik_super->link_class_impl(throw_verifyerror, CHECK_false); 555 } 556 557 // link all interfaces implemented by this class before linking this class 558 Array<Klass*>* interfaces = local_interfaces(); 559 int num_interfaces = interfaces->length(); 560 for (int index = 0; index < num_interfaces; index++) { 561 InstanceKlass* interk = InstanceKlass::cast(interfaces->at(index)); 562 interk->link_class_impl(throw_verifyerror, CHECK_false); 563 } 564 565 // in case the class is linked in the process of linking its superclasses 566 if (is_linked()) { 567 return true; 568 } 569 570 // trace only the link time for this klass that includes 571 // the verification time 572 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(), 573 ClassLoader::perf_class_link_selftime(), 574 ClassLoader::perf_classes_linked(), 575 jt->get_thread_stat()->perf_recursion_counts_addr(), 576 jt->get_thread_stat()->perf_timers_addr(), 577 PerfClassTraceTime::CLASS_LINK); 578 579 // verification & rewriting 580 { 581 HandleMark hm(THREAD); 582 Handle h_init_lock(THREAD, init_lock()); 583 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL); 584 // rewritten will have been set if loader constraint error found 585 // on an earlier link attempt 586 // don't verify or rewrite if already rewritten 587 // 588 589 if (!is_linked()) { 590 if (!is_rewritten()) { 591 { 592 bool verify_ok = verify_code(throw_verifyerror, THREAD); 593 if (!verify_ok) { 594 return false; 595 } 596 } 597 598 // Just in case a side-effect of verify linked this class already 599 // (which can sometimes happen since the verifier loads classes 600 // using custom class loaders, which are free to initialize things) 601 if (is_linked()) { 602 return true; 603 } 604 605 // also sets rewritten 606 rewrite_class(CHECK_false); 607 } else if (is_shared()) { 608 SystemDictionaryShared::check_verification_constraints(this, CHECK_false); 609 } 610 611 // relocate jsrs and link methods after they are all rewritten 612 link_methods(CHECK_false); 613 614 // Initialize the vtable and interface table after 615 // methods have been rewritten since rewrite may 616 // fabricate new Method*s. 617 // also does loader constraint checking 618 // 619 // initialize_vtable and initialize_itable need to be rerun for 620 // a shared class if the class is not loaded by the NULL classloader. 621 ClassLoaderData * loader_data = class_loader_data(); 622 if (!(is_shared() && 623 loader_data->is_the_null_class_loader_data())) { 624 ResourceMark rm(THREAD); 625 vtable().initialize_vtable(true, CHECK_false); 626 itable().initialize_itable(true, CHECK_false); 627 } 628 #ifdef ASSERT 629 else { 630 vtable().verify(tty, true); 631 // In case itable verification is ever added. 632 // itable().verify(tty, true); 633 } 634 #endif 635 set_init_state(linked); 636 if (JvmtiExport::should_post_class_prepare()) { 637 Thread *thread = THREAD; 638 assert(thread->is_Java_thread(), "thread->is_Java_thread()"); 639 JvmtiExport::post_class_prepare((JavaThread *) thread, this); 640 } 641 } 642 } 643 return true; 644 } 645 646 647 // Rewrite the byte codes of all of the methods of a class. 648 // The rewriter must be called exactly once. Rewriting must happen after 649 // verification but before the first method of the class is executed. 650 void InstanceKlass::rewrite_class(TRAPS) { 651 assert(is_loaded(), "must be loaded"); 652 if (is_rewritten()) { 653 assert(is_shared(), "rewriting an unshared class?"); 654 return; 655 } 656 Rewriter::rewrite(this, CHECK); 657 set_rewritten(); 658 } 659 660 // Now relocate and link method entry points after class is rewritten. 661 // This is outside is_rewritten flag. In case of an exception, it can be 662 // executed more than once. 663 void InstanceKlass::link_methods(TRAPS) { 664 int len = methods()->length(); 665 for (int i = len-1; i >= 0; i--) { 666 methodHandle m(THREAD, methods()->at(i)); 667 668 // Set up method entry points for compiler and interpreter . 669 m->link_method(m, CHECK); 670 } 671 } 672 673 // Eagerly initialize superinterfaces that declare default methods (concrete instance: any access) 674 void InstanceKlass::initialize_super_interfaces(TRAPS) { 675 assert (has_nonstatic_concrete_methods(), "caller should have checked this"); 676 for (int i = 0; i < local_interfaces()->length(); ++i) { 677 Klass* iface = local_interfaces()->at(i); 678 InstanceKlass* ik = InstanceKlass::cast(iface); 679 680 // Initialization is depth first search ie. we start with top of the inheritance tree 681 // has_nonstatic_concrete_methods drives searching superinterfaces since it 682 // means has_nonstatic_concrete_methods in its superinterface hierarchy 683 if (ik->has_nonstatic_concrete_methods()) { 684 ik->initialize_super_interfaces(CHECK); 685 } 686 687 // Only initialize() interfaces that "declare" concrete methods. 688 if (ik->should_be_initialized() && ik->declares_nonstatic_concrete_methods()) { 689 ik->initialize(CHECK); 690 } 691 } 692 } 693 694 void InstanceKlass::initialize_impl(TRAPS) { 695 HandleMark hm(THREAD); 696 697 // Make sure klass is linked (verified) before initialization 698 // A class could already be verified, since it has been reflected upon. 699 link_class(CHECK); 700 701 DTRACE_CLASSINIT_PROBE(required, -1); 702 703 bool wait = false; 704 705 // refer to the JVM book page 47 for description of steps 706 // Step 1 707 { 708 Handle h_init_lock(THREAD, init_lock()); 709 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL); 710 711 Thread *self = THREAD; // it's passed the current thread 712 713 // Step 2 714 // If we were to use wait() instead of waitInterruptibly() then 715 // we might end up throwing IE from link/symbol resolution sites 716 // that aren't expected to throw. This would wreak havoc. See 6320309. 717 while(is_being_initialized() && !is_reentrant_initialization(self)) { 718 wait = true; 719 ol.waitUninterruptibly(CHECK); 720 } 721 722 // Step 3 723 if (is_being_initialized() && is_reentrant_initialization(self)) { 724 DTRACE_CLASSINIT_PROBE_WAIT(recursive, -1, wait); 725 return; 726 } 727 728 // Step 4 729 if (is_initialized()) { 730 DTRACE_CLASSINIT_PROBE_WAIT(concurrent, -1, wait); 731 return; 732 } 733 734 // Step 5 735 if (is_in_error_state()) { 736 DTRACE_CLASSINIT_PROBE_WAIT(erroneous, -1, wait); 737 ResourceMark rm(THREAD); 738 const char* desc = "Could not initialize class "; 739 const char* className = external_name(); 740 size_t msglen = strlen(desc) + strlen(className) + 1; 741 char* message = NEW_RESOURCE_ARRAY(char, msglen); 742 if (NULL == message) { 743 // Out of memory: can't create detailed error message 744 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className); 745 } else { 746 jio_snprintf(message, msglen, "%s%s", desc, className); 747 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message); 748 } 749 } 750 751 // Step 6 752 set_init_state(being_initialized); 753 set_init_thread(self); 754 } 755 756 // Step 7 757 // Next, if C is a class rather than an interface, initialize it's super class and super 758 // interfaces. 759 if (!is_interface()) { 760 Klass* super_klass = super(); 761 if (super_klass != NULL && super_klass->should_be_initialized()) { 762 super_klass->initialize(THREAD); 763 } 764 // If C implements any interface that declares a non-static, concrete method, 765 // the initialization of C triggers initialization of its super interfaces. 766 // Only need to recurse if has_nonstatic_concrete_methods which includes declaring and 767 // having a superinterface that declares, non-static, concrete methods 768 if (!HAS_PENDING_EXCEPTION && has_nonstatic_concrete_methods()) { 769 initialize_super_interfaces(THREAD); 770 } 771 772 // If any exceptions, complete abruptly, throwing the same exception as above. 773 if (HAS_PENDING_EXCEPTION) { 774 Handle e(THREAD, PENDING_EXCEPTION); 775 CLEAR_PENDING_EXCEPTION; 776 { 777 EXCEPTION_MARK; 778 // Locks object, set state, and notify all waiting threads 779 set_initialization_state_and_notify(initialization_error, THREAD); 780 CLEAR_PENDING_EXCEPTION; 781 } 782 DTRACE_CLASSINIT_PROBE_WAIT(super__failed, -1, wait); 783 THROW_OOP(e()); 784 } 785 } 786 787 788 // Look for aot compiled methods for this klass, including class initializer. 789 AOTLoader::load_for_klass(this, THREAD); 790 791 // Step 8 792 { 793 assert(THREAD->is_Java_thread(), "non-JavaThread in initialize_impl"); 794 JavaThread* jt = (JavaThread*)THREAD; 795 DTRACE_CLASSINIT_PROBE_WAIT(clinit, -1, wait); 796 // Timer includes any side effects of class initialization (resolution, 797 // etc), but not recursive entry into call_class_initializer(). 798 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(), 799 ClassLoader::perf_class_init_selftime(), 800 ClassLoader::perf_classes_inited(), 801 jt->get_thread_stat()->perf_recursion_counts_addr(), 802 jt->get_thread_stat()->perf_timers_addr(), 803 PerfClassTraceTime::CLASS_CLINIT); 804 call_class_initializer(THREAD); 805 } 806 807 // Step 9 808 if (!HAS_PENDING_EXCEPTION) { 809 set_initialization_state_and_notify(fully_initialized, CHECK); 810 { 811 debug_only(vtable().verify(tty, true);) 812 } 813 } 814 else { 815 // Step 10 and 11 816 Handle e(THREAD, PENDING_EXCEPTION); 817 CLEAR_PENDING_EXCEPTION; 818 // JVMTI has already reported the pending exception 819 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError 820 JvmtiExport::clear_detected_exception((JavaThread*)THREAD); 821 { 822 EXCEPTION_MARK; 823 set_initialization_state_and_notify(initialization_error, THREAD); 824 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below 825 // JVMTI has already reported the pending exception 826 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError 827 JvmtiExport::clear_detected_exception((JavaThread*)THREAD); 828 } 829 DTRACE_CLASSINIT_PROBE_WAIT(error, -1, wait); 830 if (e->is_a(SystemDictionary::Error_klass())) { 831 THROW_OOP(e()); 832 } else { 833 JavaCallArguments args(e); 834 THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(), 835 vmSymbols::throwable_void_signature(), 836 &args); 837 } 838 } 839 DTRACE_CLASSINIT_PROBE_WAIT(end, -1, wait); 840 } 841 842 843 void InstanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) { 844 Handle h_init_lock(THREAD, init_lock()); 845 if (h_init_lock() != NULL) { 846 ObjectLocker ol(h_init_lock, THREAD); 847 set_init_state(state); 848 fence_and_clear_init_lock(); 849 ol.notify_all(CHECK); 850 } else { 851 assert(h_init_lock() != NULL, "The initialization state should never be set twice"); 852 set_init_state(state); 853 } 854 } 855 856 // The embedded _implementor field can only record one implementor. 857 // When there are more than one implementors, the _implementor field 858 // is set to the interface Klass* itself. Following are the possible 859 // values for the _implementor field: 860 // NULL - no implementor 861 // implementor Klass* - one implementor 862 // self - more than one implementor 863 // 864 // The _implementor field only exists for interfaces. 865 void InstanceKlass::add_implementor(Klass* k) { 866 assert(Compile_lock->owned_by_self(), ""); 867 assert(is_interface(), "not interface"); 868 // Filter out my subinterfaces. 869 // (Note: Interfaces are never on the subklass list.) 870 if (InstanceKlass::cast(k)->is_interface()) return; 871 872 // Filter out subclasses whose supers already implement me. 873 // (Note: CHA must walk subclasses of direct implementors 874 // in order to locate indirect implementors.) 875 Klass* sk = k->super(); 876 if (sk != NULL && InstanceKlass::cast(sk)->implements_interface(this)) 877 // We only need to check one immediate superclass, since the 878 // implements_interface query looks at transitive_interfaces. 879 // Any supers of the super have the same (or fewer) transitive_interfaces. 880 return; 881 882 Klass* ik = implementor(); 883 if (ik == NULL) { 884 set_implementor(k); 885 } else if (ik != this) { 886 // There is already an implementor. Use itself as an indicator of 887 // more than one implementors. 888 set_implementor(this); 889 } 890 891 // The implementor also implements the transitive_interfaces 892 for (int index = 0; index < local_interfaces()->length(); index++) { 893 InstanceKlass::cast(local_interfaces()->at(index))->add_implementor(k); 894 } 895 } 896 897 void InstanceKlass::init_implementor() { 898 if (is_interface()) { 899 set_implementor(NULL); 900 } 901 } 902 903 904 void InstanceKlass::process_interfaces(Thread *thread) { 905 // link this class into the implementors list of every interface it implements 906 for (int i = local_interfaces()->length() - 1; i >= 0; i--) { 907 assert(local_interfaces()->at(i)->is_klass(), "must be a klass"); 908 InstanceKlass* interf = InstanceKlass::cast(local_interfaces()->at(i)); 909 assert(interf->is_interface(), "expected interface"); 910 interf->add_implementor(this); 911 } 912 } 913 914 bool InstanceKlass::can_be_primary_super_slow() const { 915 if (is_interface()) 916 return false; 917 else 918 return Klass::can_be_primary_super_slow(); 919 } 920 921 GrowableArray<Klass*>* InstanceKlass::compute_secondary_supers(int num_extra_slots, 922 Array<Klass*>* transitive_interfaces) { 923 // The secondaries are the implemented interfaces. 924 Array<Klass*>* interfaces = transitive_interfaces; 925 int num_secondaries = num_extra_slots + interfaces->length(); 926 if (num_secondaries == 0) { 927 // Must share this for correct bootstrapping! 928 set_secondary_supers(Universe::the_empty_klass_array()); 929 return NULL; 930 } else if (num_extra_slots == 0) { 931 // The secondary super list is exactly the same as the transitive interfaces. 932 // Redefine classes has to be careful not to delete this! 933 set_secondary_supers(interfaces); 934 return NULL; 935 } else { 936 // Copy transitive interfaces to a temporary growable array to be constructed 937 // into the secondary super list with extra slots. 938 GrowableArray<Klass*>* secondaries = new GrowableArray<Klass*>(interfaces->length()); 939 for (int i = 0; i < interfaces->length(); i++) { 940 secondaries->push(interfaces->at(i)); 941 } 942 return secondaries; 943 } 944 } 945 946 bool InstanceKlass::compute_is_subtype_of(Klass* k) { 947 if (k->is_interface()) { 948 return implements_interface(k); 949 } else { 950 return Klass::compute_is_subtype_of(k); 951 } 952 } 953 954 bool InstanceKlass::implements_interface(Klass* k) const { 955 if (this == k) return true; 956 assert(k->is_interface(), "should be an interface class"); 957 for (int i = 0; i < transitive_interfaces()->length(); i++) { 958 if (transitive_interfaces()->at(i) == k) { 959 return true; 960 } 961 } 962 return false; 963 } 964 965 bool InstanceKlass::is_same_or_direct_interface(Klass *k) const { 966 // Verify direct super interface 967 if (this == k) return true; 968 assert(k->is_interface(), "should be an interface class"); 969 for (int i = 0; i < local_interfaces()->length(); i++) { 970 if (local_interfaces()->at(i) == k) { 971 return true; 972 } 973 } 974 return false; 975 } 976 977 objArrayOop InstanceKlass::allocate_objArray(int n, int length, TRAPS) { 978 if (length < 0) { 979 ResourceMark rm(THREAD); 980 stringStream ss; 981 ss.print("%d", length); 982 THROW_MSG_0(vmSymbols::java_lang_NegativeArraySizeException(), ss.as_string()); 983 } 984 if (length > arrayOopDesc::max_array_length(T_OBJECT)) { 985 report_java_out_of_memory("Requested array size exceeds VM limit"); 986 JvmtiExport::post_array_size_exhausted(); 987 THROW_OOP_0(Universe::out_of_memory_error_array_size()); 988 } 989 int size = objArrayOopDesc::object_size(length); 990 Klass* ak = array_klass(n, CHECK_NULL); 991 objArrayOop o = 992 (objArrayOop)CollectedHeap::array_allocate(ak, size, length, CHECK_NULL); 993 return o; 994 } 995 996 instanceOop InstanceKlass::register_finalizer(instanceOop i, TRAPS) { 997 if (TraceFinalizerRegistration) { 998 tty->print("Registered "); 999 i->print_value_on(tty); 1000 tty->print_cr(" (" INTPTR_FORMAT ") as finalizable", p2i(i)); 1001 } 1002 instanceHandle h_i(THREAD, i); 1003 // Pass the handle as argument, JavaCalls::call expects oop as jobjects 1004 JavaValue result(T_VOID); 1005 JavaCallArguments args(h_i); 1006 methodHandle mh (THREAD, Universe::finalizer_register_method()); 1007 JavaCalls::call(&result, mh, &args, CHECK_NULL); 1008 return h_i(); 1009 } 1010 1011 instanceOop InstanceKlass::allocate_instance(TRAPS) { 1012 bool has_finalizer_flag = has_finalizer(); // Query before possible GC 1013 int size = size_helper(); // Query before forming handle. 1014 1015 instanceOop i; 1016 1017 i = (instanceOop)CollectedHeap::obj_allocate(this, size, CHECK_NULL); 1018 if (has_finalizer_flag && !RegisterFinalizersAtInit) { 1019 i = register_finalizer(i, CHECK_NULL); 1020 } 1021 return i; 1022 } 1023 1024 instanceHandle InstanceKlass::allocate_instance_handle(TRAPS) { 1025 return instanceHandle(THREAD, allocate_instance(THREAD)); 1026 } 1027 1028 void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) { 1029 if (is_interface() || is_abstract()) { 1030 ResourceMark rm(THREAD); 1031 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError() 1032 : vmSymbols::java_lang_InstantiationException(), external_name()); 1033 } 1034 if (this == SystemDictionary::Class_klass()) { 1035 ResourceMark rm(THREAD); 1036 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError() 1037 : vmSymbols::java_lang_IllegalAccessException(), external_name()); 1038 } 1039 } 1040 1041 Klass* InstanceKlass::array_klass_impl(bool or_null, int n, TRAPS) { 1042 // Need load-acquire for lock-free read 1043 if (array_klasses_acquire() == NULL) { 1044 if (or_null) return NULL; 1045 1046 ResourceMark rm; 1047 JavaThread *jt = (JavaThread *)THREAD; 1048 { 1049 // Atomic creation of array_klasses 1050 MutexLocker mc(Compile_lock, THREAD); // for vtables 1051 MutexLocker ma(MultiArray_lock, THREAD); 1052 1053 // Check if update has already taken place 1054 if (array_klasses() == NULL) { 1055 Klass* k = ObjArrayKlass::allocate_objArray_klass(class_loader_data(), 1, this, CHECK_NULL); 1056 // use 'release' to pair with lock-free load 1057 release_set_array_klasses(k); 1058 } 1059 } 1060 } 1061 // _this will always be set at this point 1062 ObjArrayKlass* oak = (ObjArrayKlass*)array_klasses(); 1063 if (or_null) { 1064 return oak->array_klass_or_null(n); 1065 } 1066 return oak->array_klass(n, THREAD); 1067 } 1068 1069 Klass* InstanceKlass::array_klass_impl(bool or_null, TRAPS) { 1070 return array_klass_impl(or_null, 1, THREAD); 1071 } 1072 1073 static int call_class_initializer_counter = 0; // for debugging 1074 1075 Method* InstanceKlass::class_initializer() const { 1076 Method* clinit = find_method( 1077 vmSymbols::class_initializer_name(), vmSymbols::void_method_signature()); 1078 if (clinit != NULL && clinit->has_valid_initializer_flags()) { 1079 return clinit; 1080 } 1081 return NULL; 1082 } 1083 1084 void InstanceKlass::call_class_initializer(TRAPS) { 1085 if (ReplayCompiles && 1086 (ReplaySuppressInitializers == 1 || 1087 (ReplaySuppressInitializers >= 2 && class_loader() != NULL))) { 1088 // Hide the existence of the initializer for the purpose of replaying the compile 1089 return; 1090 } 1091 1092 methodHandle h_method(THREAD, class_initializer()); 1093 assert(!is_initialized(), "we cannot initialize twice"); 1094 LogTarget(Info, class, init) lt; 1095 if (lt.is_enabled()) { 1096 ResourceMark rm; 1097 LogStream ls(lt); 1098 ls.print("%d Initializing ", call_class_initializer_counter++); 1099 name()->print_value_on(&ls); 1100 ls.print_cr("%s (" INTPTR_FORMAT ")", h_method() == NULL ? "(no method)" : "", p2i(this)); 1101 } 1102 if (h_method() != NULL) { 1103 JavaCallArguments args; // No arguments 1104 JavaValue result(T_VOID); 1105 JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args) 1106 } 1107 } 1108 1109 1110 void InstanceKlass::mask_for(const methodHandle& method, int bci, 1111 InterpreterOopMap* entry_for) { 1112 // Lazily create the _oop_map_cache at first request 1113 // Lock-free access requires load_acquire. 1114 OopMapCache* oop_map_cache = OrderAccess::load_acquire(&_oop_map_cache); 1115 if (oop_map_cache == NULL) { 1116 MutexLocker x(OopMapCacheAlloc_lock); 1117 // Check if _oop_map_cache was allocated while we were waiting for this lock 1118 if ((oop_map_cache = _oop_map_cache) == NULL) { 1119 oop_map_cache = new OopMapCache(); 1120 // Ensure _oop_map_cache is stable, since it is examined without a lock 1121 OrderAccess::release_store(&_oop_map_cache, oop_map_cache); 1122 } 1123 } 1124 // _oop_map_cache is constant after init; lookup below does its own locking. 1125 oop_map_cache->lookup(method, bci, entry_for); 1126 } 1127 1128 1129 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { 1130 for (JavaFieldStream fs(this); !fs.done(); fs.next()) { 1131 Symbol* f_name = fs.name(); 1132 Symbol* f_sig = fs.signature(); 1133 if (f_name == name && f_sig == sig) { 1134 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index()); 1135 return true; 1136 } 1137 } 1138 return false; 1139 } 1140 1141 1142 Klass* InstanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { 1143 const int n = local_interfaces()->length(); 1144 for (int i = 0; i < n; i++) { 1145 Klass* intf1 = local_interfaces()->at(i); 1146 assert(intf1->is_interface(), "just checking type"); 1147 // search for field in current interface 1148 if (InstanceKlass::cast(intf1)->find_local_field(name, sig, fd)) { 1149 assert(fd->is_static(), "interface field must be static"); 1150 return intf1; 1151 } 1152 // search for field in direct superinterfaces 1153 Klass* intf2 = InstanceKlass::cast(intf1)->find_interface_field(name, sig, fd); 1154 if (intf2 != NULL) return intf2; 1155 } 1156 // otherwise field lookup fails 1157 return NULL; 1158 } 1159 1160 1161 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { 1162 // search order according to newest JVM spec (5.4.3.2, p.167). 1163 // 1) search for field in current klass 1164 if (find_local_field(name, sig, fd)) { 1165 return const_cast<InstanceKlass*>(this); 1166 } 1167 // 2) search for field recursively in direct superinterfaces 1168 { Klass* intf = find_interface_field(name, sig, fd); 1169 if (intf != NULL) return intf; 1170 } 1171 // 3) apply field lookup recursively if superclass exists 1172 { Klass* supr = super(); 1173 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, fd); 1174 } 1175 // 4) otherwise field lookup fails 1176 return NULL; 1177 } 1178 1179 1180 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const { 1181 // search order according to newest JVM spec (5.4.3.2, p.167). 1182 // 1) search for field in current klass 1183 if (find_local_field(name, sig, fd)) { 1184 if (fd->is_static() == is_static) return const_cast<InstanceKlass*>(this); 1185 } 1186 // 2) search for field recursively in direct superinterfaces 1187 if (is_static) { 1188 Klass* intf = find_interface_field(name, sig, fd); 1189 if (intf != NULL) return intf; 1190 } 1191 // 3) apply field lookup recursively if superclass exists 1192 { Klass* supr = super(); 1193 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, is_static, fd); 1194 } 1195 // 4) otherwise field lookup fails 1196 return NULL; 1197 } 1198 1199 1200 bool InstanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const { 1201 for (JavaFieldStream fs(this); !fs.done(); fs.next()) { 1202 if (fs.offset() == offset) { 1203 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index()); 1204 if (fd->is_static() == is_static) return true; 1205 } 1206 } 1207 return false; 1208 } 1209 1210 1211 bool InstanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const { 1212 Klass* klass = const_cast<InstanceKlass*>(this); 1213 while (klass != NULL) { 1214 if (InstanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) { 1215 return true; 1216 } 1217 klass = klass->super(); 1218 } 1219 return false; 1220 } 1221 1222 1223 void InstanceKlass::methods_do(void f(Method* method)) { 1224 // Methods aren't stable until they are loaded. This can be read outside 1225 // a lock through the ClassLoaderData for profiling 1226 if (!is_loaded()) { 1227 return; 1228 } 1229 1230 int len = methods()->length(); 1231 for (int index = 0; index < len; index++) { 1232 Method* m = methods()->at(index); 1233 assert(m->is_method(), "must be method"); 1234 f(m); 1235 } 1236 } 1237 1238 1239 void InstanceKlass::do_local_static_fields(FieldClosure* cl) { 1240 for (JavaFieldStream fs(this); !fs.done(); fs.next()) { 1241 if (fs.access_flags().is_static()) { 1242 fieldDescriptor& fd = fs.field_descriptor(); 1243 cl->do_field(&fd); 1244 } 1245 } 1246 } 1247 1248 1249 void InstanceKlass::do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle mirror, TRAPS) { 1250 for (JavaFieldStream fs(this); !fs.done(); fs.next()) { 1251 if (fs.access_flags().is_static()) { 1252 fieldDescriptor& fd = fs.field_descriptor(); 1253 f(&fd, mirror, CHECK); 1254 } 1255 } 1256 } 1257 1258 1259 static int compare_fields_by_offset(int* a, int* b) { 1260 return a[0] - b[0]; 1261 } 1262 1263 void InstanceKlass::do_nonstatic_fields(FieldClosure* cl) { 1264 InstanceKlass* super = superklass(); 1265 if (super != NULL) { 1266 super->do_nonstatic_fields(cl); 1267 } 1268 fieldDescriptor fd; 1269 int length = java_fields_count(); 1270 // In DebugInfo nonstatic fields are sorted by offset. 1271 int* fields_sorted = NEW_C_HEAP_ARRAY(int, 2*(length+1), mtClass); 1272 int j = 0; 1273 for (int i = 0; i < length; i += 1) { 1274 fd.reinitialize(this, i); 1275 if (!fd.is_static()) { 1276 fields_sorted[j + 0] = fd.offset(); 1277 fields_sorted[j + 1] = i; 1278 j += 2; 1279 } 1280 } 1281 if (j > 0) { 1282 length = j; 1283 // _sort_Fn is defined in growableArray.hpp. 1284 qsort(fields_sorted, length/2, 2*sizeof(int), (_sort_Fn)compare_fields_by_offset); 1285 for (int i = 0; i < length; i += 2) { 1286 fd.reinitialize(this, fields_sorted[i + 1]); 1287 assert(!fd.is_static() && fd.offset() == fields_sorted[i], "only nonstatic fields"); 1288 cl->do_field(&fd); 1289 } 1290 } 1291 FREE_C_HEAP_ARRAY(int, fields_sorted); 1292 } 1293 1294 1295 void InstanceKlass::array_klasses_do(void f(Klass* k, TRAPS), TRAPS) { 1296 if (array_klasses() != NULL) 1297 ArrayKlass::cast(array_klasses())->array_klasses_do(f, THREAD); 1298 } 1299 1300 void InstanceKlass::array_klasses_do(void f(Klass* k)) { 1301 if (array_klasses() != NULL) 1302 ArrayKlass::cast(array_klasses())->array_klasses_do(f); 1303 } 1304 1305 #ifdef ASSERT 1306 static int linear_search(const Array<Method*>* methods, 1307 const Symbol* name, 1308 const Symbol* signature) { 1309 const int len = methods->length(); 1310 for (int index = 0; index < len; index++) { 1311 const Method* const m = methods->at(index); 1312 assert(m->is_method(), "must be method"); 1313 if (m->signature() == signature && m->name() == name) { 1314 return index; 1315 } 1316 } 1317 return -1; 1318 } 1319 #endif 1320 1321 static int binary_search(const Array<Method*>* methods, const Symbol* name) { 1322 int len = methods->length(); 1323 // methods are sorted, so do binary search 1324 int l = 0; 1325 int h = len - 1; 1326 while (l <= h) { 1327 int mid = (l + h) >> 1; 1328 Method* m = methods->at(mid); 1329 assert(m->is_method(), "must be method"); 1330 int res = m->name()->fast_compare(name); 1331 if (res == 0) { 1332 return mid; 1333 } else if (res < 0) { 1334 l = mid + 1; 1335 } else { 1336 h = mid - 1; 1337 } 1338 } 1339 return -1; 1340 } 1341 1342 // find_method looks up the name/signature in the local methods array 1343 Method* InstanceKlass::find_method(const Symbol* name, 1344 const Symbol* signature) const { 1345 return find_method_impl(name, signature, find_overpass, find_static, find_private); 1346 } 1347 1348 Method* InstanceKlass::find_method_impl(const Symbol* name, 1349 const Symbol* signature, 1350 OverpassLookupMode overpass_mode, 1351 StaticLookupMode static_mode, 1352 PrivateLookupMode private_mode) const { 1353 return InstanceKlass::find_method_impl(methods(), 1354 name, 1355 signature, 1356 overpass_mode, 1357 static_mode, 1358 private_mode); 1359 } 1360 1361 // find_instance_method looks up the name/signature in the local methods array 1362 // and skips over static methods 1363 Method* InstanceKlass::find_instance_method(const Array<Method*>* methods, 1364 const Symbol* name, 1365 const Symbol* signature) { 1366 Method* const meth = InstanceKlass::find_method_impl(methods, 1367 name, 1368 signature, 1369 find_overpass, 1370 skip_static, 1371 find_private); 1372 assert(((meth == NULL) || !meth->is_static()), 1373 "find_instance_method should have skipped statics"); 1374 return meth; 1375 } 1376 1377 // find_instance_method looks up the name/signature in the local methods array 1378 // and skips over static methods 1379 Method* InstanceKlass::find_instance_method(const Symbol* name, const Symbol* signature) const { 1380 return InstanceKlass::find_instance_method(methods(), name, signature); 1381 } 1382 1383 // Find looks up the name/signature in the local methods array 1384 // and filters on the overpass, static and private flags 1385 // This returns the first one found 1386 // note that the local methods array can have up to one overpass, one static 1387 // and one instance (private or not) with the same name/signature 1388 Method* InstanceKlass::find_local_method(const Symbol* name, 1389 const Symbol* signature, 1390 OverpassLookupMode overpass_mode, 1391 StaticLookupMode static_mode, 1392 PrivateLookupMode private_mode) const { 1393 return InstanceKlass::find_method_impl(methods(), 1394 name, 1395 signature, 1396 overpass_mode, 1397 static_mode, 1398 private_mode); 1399 } 1400 1401 // Find looks up the name/signature in the local methods array 1402 // and filters on the overpass, static and private flags 1403 // This returns the first one found 1404 // note that the local methods array can have up to one overpass, one static 1405 // and one instance (private or not) with the same name/signature 1406 Method* InstanceKlass::find_local_method(const Array<Method*>* methods, 1407 const Symbol* name, 1408 const Symbol* signature, 1409 OverpassLookupMode overpass_mode, 1410 StaticLookupMode static_mode, 1411 PrivateLookupMode private_mode) { 1412 return InstanceKlass::find_method_impl(methods, 1413 name, 1414 signature, 1415 overpass_mode, 1416 static_mode, 1417 private_mode); 1418 } 1419 1420 Method* InstanceKlass::find_method(const Array<Method*>* methods, 1421 const Symbol* name, 1422 const Symbol* signature) { 1423 return InstanceKlass::find_method_impl(methods, 1424 name, 1425 signature, 1426 find_overpass, 1427 find_static, 1428 find_private); 1429 } 1430 1431 Method* InstanceKlass::find_method_impl(const Array<Method*>* methods, 1432 const Symbol* name, 1433 const Symbol* signature, 1434 OverpassLookupMode overpass_mode, 1435 StaticLookupMode static_mode, 1436 PrivateLookupMode private_mode) { 1437 int hit = find_method_index(methods, name, signature, overpass_mode, static_mode, private_mode); 1438 return hit >= 0 ? methods->at(hit): NULL; 1439 } 1440 1441 // true if method matches signature and conforms to skipping_X conditions. 1442 static bool method_matches(const Method* m, 1443 const Symbol* signature, 1444 bool skipping_overpass, 1445 bool skipping_static, 1446 bool skipping_private) { 1447 return ((m->signature() == signature) && 1448 (!skipping_overpass || !m->is_overpass()) && 1449 (!skipping_static || !m->is_static()) && 1450 (!skipping_private || !m->is_private())); 1451 } 1452 1453 // Used directly for default_methods to find the index into the 1454 // default_vtable_indices, and indirectly by find_method 1455 // find_method_index looks in the local methods array to return the index 1456 // of the matching name/signature. If, overpass methods are being ignored, 1457 // the search continues to find a potential non-overpass match. This capability 1458 // is important during method resolution to prefer a static method, for example, 1459 // over an overpass method. 1460 // There is the possibility in any _method's array to have the same name/signature 1461 // for a static method, an overpass method and a local instance method 1462 // To correctly catch a given method, the search criteria may need 1463 // to explicitly skip the other two. For local instance methods, it 1464 // is often necessary to skip private methods 1465 int InstanceKlass::find_method_index(const Array<Method*>* methods, 1466 const Symbol* name, 1467 const Symbol* signature, 1468 OverpassLookupMode overpass_mode, 1469 StaticLookupMode static_mode, 1470 PrivateLookupMode private_mode) { 1471 const bool skipping_overpass = (overpass_mode == skip_overpass); 1472 const bool skipping_static = (static_mode == skip_static); 1473 const bool skipping_private = (private_mode == skip_private); 1474 const int hit = binary_search(methods, name); 1475 if (hit != -1) { 1476 const Method* const m = methods->at(hit); 1477 1478 // Do linear search to find matching signature. First, quick check 1479 // for common case, ignoring overpasses if requested. 1480 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) { 1481 return hit; 1482 } 1483 1484 // search downwards through overloaded methods 1485 int i; 1486 for (i = hit - 1; i >= 0; --i) { 1487 const Method* const m = methods->at(i); 1488 assert(m->is_method(), "must be method"); 1489 if (m->name() != name) { 1490 break; 1491 } 1492 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) { 1493 return i; 1494 } 1495 } 1496 // search upwards 1497 for (i = hit + 1; i < methods->length(); ++i) { 1498 const Method* const m = methods->at(i); 1499 assert(m->is_method(), "must be method"); 1500 if (m->name() != name) { 1501 break; 1502 } 1503 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) { 1504 return i; 1505 } 1506 } 1507 // not found 1508 #ifdef ASSERT 1509 const int index = (skipping_overpass || skipping_static || skipping_private) ? -1 : 1510 linear_search(methods, name, signature); 1511 assert(-1 == index, "binary search should have found entry %d", index); 1512 #endif 1513 } 1514 return -1; 1515 } 1516 1517 int InstanceKlass::find_method_by_name(const Symbol* name, int* end) const { 1518 return find_method_by_name(methods(), name, end); 1519 } 1520 1521 int InstanceKlass::find_method_by_name(const Array<Method*>* methods, 1522 const Symbol* name, 1523 int* end_ptr) { 1524 assert(end_ptr != NULL, "just checking"); 1525 int start = binary_search(methods, name); 1526 int end = start + 1; 1527 if (start != -1) { 1528 while (start - 1 >= 0 && (methods->at(start - 1))->name() == name) --start; 1529 while (end < methods->length() && (methods->at(end))->name() == name) ++end; 1530 *end_ptr = end; 1531 return start; 1532 } 1533 return -1; 1534 } 1535 1536 // uncached_lookup_method searches both the local class methods array and all 1537 // superclasses methods arrays, skipping any overpass methods in superclasses. 1538 Method* InstanceKlass::uncached_lookup_method(const Symbol* name, 1539 const Symbol* signature, 1540 OverpassLookupMode overpass_mode) const { 1541 OverpassLookupMode overpass_local_mode = overpass_mode; 1542 const Klass* klass = this; 1543 while (klass != NULL) { 1544 Method* const method = InstanceKlass::cast(klass)->find_method_impl(name, 1545 signature, 1546 overpass_local_mode, 1547 find_static, 1548 find_private); 1549 if (method != NULL) { 1550 return method; 1551 } 1552 klass = klass->super(); 1553 overpass_local_mode = skip_overpass; // Always ignore overpass methods in superclasses 1554 } 1555 return NULL; 1556 } 1557 1558 #ifdef ASSERT 1559 // search through class hierarchy and return true if this class or 1560 // one of the superclasses was redefined 1561 bool InstanceKlass::has_redefined_this_or_super() const { 1562 const Klass* klass = this; 1563 while (klass != NULL) { 1564 if (InstanceKlass::cast(klass)->has_been_redefined()) { 1565 return true; 1566 } 1567 klass = klass->super(); 1568 } 1569 return false; 1570 } 1571 #endif 1572 1573 // lookup a method in the default methods list then in all transitive interfaces 1574 // Do NOT return private or static methods 1575 Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name, 1576 Symbol* signature) const { 1577 Method* m = NULL; 1578 if (default_methods() != NULL) { 1579 m = find_method(default_methods(), name, signature); 1580 } 1581 // Look up interfaces 1582 if (m == NULL) { 1583 m = lookup_method_in_all_interfaces(name, signature, find_defaults); 1584 } 1585 return m; 1586 } 1587 1588 // lookup a method in all the interfaces that this class implements 1589 // Do NOT return private or static methods, new in JDK8 which are not externally visible 1590 // They should only be found in the initial InterfaceMethodRef 1591 Method* InstanceKlass::lookup_method_in_all_interfaces(Symbol* name, 1592 Symbol* signature, 1593 DefaultsLookupMode defaults_mode) const { 1594 Array<Klass*>* all_ifs = transitive_interfaces(); 1595 int num_ifs = all_ifs->length(); 1596 InstanceKlass *ik = NULL; 1597 for (int i = 0; i < num_ifs; i++) { 1598 ik = InstanceKlass::cast(all_ifs->at(i)); 1599 Method* m = ik->lookup_method(name, signature); 1600 if (m != NULL && m->is_public() && !m->is_static() && 1601 ((defaults_mode != skip_defaults) || !m->is_default_method())) { 1602 return m; 1603 } 1604 } 1605 return NULL; 1606 } 1607 1608 /* jni_id_for_impl for jfieldIds only */ 1609 JNIid* InstanceKlass::jni_id_for_impl(int offset) { 1610 MutexLocker ml(JfieldIdCreation_lock); 1611 // Retry lookup after we got the lock 1612 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset); 1613 if (probe == NULL) { 1614 // Slow case, allocate new static field identifier 1615 probe = new JNIid(this, offset, jni_ids()); 1616 set_jni_ids(probe); 1617 } 1618 return probe; 1619 } 1620 1621 1622 /* jni_id_for for jfieldIds only */ 1623 JNIid* InstanceKlass::jni_id_for(int offset) { 1624 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset); 1625 if (probe == NULL) { 1626 probe = jni_id_for_impl(offset); 1627 } 1628 return probe; 1629 } 1630 1631 u2 InstanceKlass::enclosing_method_data(int offset) const { 1632 const Array<jushort>* const inner_class_list = inner_classes(); 1633 if (inner_class_list == NULL) { 1634 return 0; 1635 } 1636 const int length = inner_class_list->length(); 1637 if (length % inner_class_next_offset == 0) { 1638 return 0; 1639 } 1640 const int index = length - enclosing_method_attribute_size; 1641 assert(offset < enclosing_method_attribute_size, "invalid offset"); 1642 return inner_class_list->at(index + offset); 1643 } 1644 1645 void InstanceKlass::set_enclosing_method_indices(u2 class_index, 1646 u2 method_index) { 1647 Array<jushort>* inner_class_list = inner_classes(); 1648 assert (inner_class_list != NULL, "_inner_classes list is not set up"); 1649 int length = inner_class_list->length(); 1650 if (length % inner_class_next_offset == enclosing_method_attribute_size) { 1651 int index = length - enclosing_method_attribute_size; 1652 inner_class_list->at_put( 1653 index + enclosing_method_class_index_offset, class_index); 1654 inner_class_list->at_put( 1655 index + enclosing_method_method_index_offset, method_index); 1656 } 1657 } 1658 1659 // Lookup or create a jmethodID. 1660 // This code is called by the VMThread and JavaThreads so the 1661 // locking has to be done very carefully to avoid deadlocks 1662 // and/or other cache consistency problems. 1663 // 1664 jmethodID InstanceKlass::get_jmethod_id(const methodHandle& method_h) { 1665 size_t idnum = (size_t)method_h->method_idnum(); 1666 jmethodID* jmeths = methods_jmethod_ids_acquire(); 1667 size_t length = 0; 1668 jmethodID id = NULL; 1669 1670 // We use a double-check locking idiom here because this cache is 1671 // performance sensitive. In the normal system, this cache only 1672 // transitions from NULL to non-NULL which is safe because we use 1673 // release_set_methods_jmethod_ids() to advertise the new cache. 1674 // A partially constructed cache should never be seen by a racing 1675 // thread. We also use release_store() to save a new jmethodID 1676 // in the cache so a partially constructed jmethodID should never be 1677 // seen either. Cache reads of existing jmethodIDs proceed without a 1678 // lock, but cache writes of a new jmethodID requires uniqueness and 1679 // creation of the cache itself requires no leaks so a lock is 1680 // generally acquired in those two cases. 1681 // 1682 // If the RedefineClasses() API has been used, then this cache can 1683 // grow and we'll have transitions from non-NULL to bigger non-NULL. 1684 // Cache creation requires no leaks and we require safety between all 1685 // cache accesses and freeing of the old cache so a lock is generally 1686 // acquired when the RedefineClasses() API has been used. 1687 1688 if (jmeths != NULL) { 1689 // the cache already exists 1690 if (!idnum_can_increment()) { 1691 // the cache can't grow so we can just get the current values 1692 get_jmethod_id_length_value(jmeths, idnum, &length, &id); 1693 } else { 1694 // cache can grow so we have to be more careful 1695 if (Threads::number_of_threads() == 0 || 1696 SafepointSynchronize::is_at_safepoint()) { 1697 // we're single threaded or at a safepoint - no locking needed 1698 get_jmethod_id_length_value(jmeths, idnum, &length, &id); 1699 } else { 1700 MutexLocker ml(JmethodIdCreation_lock); 1701 get_jmethod_id_length_value(jmeths, idnum, &length, &id); 1702 } 1703 } 1704 } 1705 // implied else: 1706 // we need to allocate a cache so default length and id values are good 1707 1708 if (jmeths == NULL || // no cache yet 1709 length <= idnum || // cache is too short 1710 id == NULL) { // cache doesn't contain entry 1711 1712 // This function can be called by the VMThread so we have to do all 1713 // things that might block on a safepoint before grabbing the lock. 1714 // Otherwise, we can deadlock with the VMThread or have a cache 1715 // consistency issue. These vars keep track of what we might have 1716 // to free after the lock is dropped. 1717 jmethodID to_dealloc_id = NULL; 1718 jmethodID* to_dealloc_jmeths = NULL; 1719 1720 // may not allocate new_jmeths or use it if we allocate it 1721 jmethodID* new_jmeths = NULL; 1722 if (length <= idnum) { 1723 // allocate a new cache that might be used 1724 size_t size = MAX2(idnum+1, (size_t)idnum_allocated_count()); 1725 new_jmeths = NEW_C_HEAP_ARRAY(jmethodID, size+1, mtClass); 1726 memset(new_jmeths, 0, (size+1)*sizeof(jmethodID)); 1727 // cache size is stored in element[0], other elements offset by one 1728 new_jmeths[0] = (jmethodID)size; 1729 } 1730 1731 // allocate a new jmethodID that might be used 1732 jmethodID new_id = NULL; 1733 if (method_h->is_old() && !method_h->is_obsolete()) { 1734 // The method passed in is old (but not obsolete), we need to use the current version 1735 Method* current_method = method_with_idnum((int)idnum); 1736 assert(current_method != NULL, "old and but not obsolete, so should exist"); 1737 new_id = Method::make_jmethod_id(class_loader_data(), current_method); 1738 } else { 1739 // It is the current version of the method or an obsolete method, 1740 // use the version passed in 1741 new_id = Method::make_jmethod_id(class_loader_data(), method_h()); 1742 } 1743 1744 if (Threads::number_of_threads() == 0 || 1745 SafepointSynchronize::is_at_safepoint()) { 1746 // we're single threaded or at a safepoint - no locking needed 1747 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths, 1748 &to_dealloc_id, &to_dealloc_jmeths); 1749 } else { 1750 MutexLocker ml(JmethodIdCreation_lock); 1751 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths, 1752 &to_dealloc_id, &to_dealloc_jmeths); 1753 } 1754 1755 // The lock has been dropped so we can free resources. 1756 // Free up either the old cache or the new cache if we allocated one. 1757 if (to_dealloc_jmeths != NULL) { 1758 FreeHeap(to_dealloc_jmeths); 1759 } 1760 // free up the new ID since it wasn't needed 1761 if (to_dealloc_id != NULL) { 1762 Method::destroy_jmethod_id(class_loader_data(), to_dealloc_id); 1763 } 1764 } 1765 return id; 1766 } 1767 1768 // Figure out how many jmethodIDs haven't been allocated, and make 1769 // sure space for them is pre-allocated. This makes getting all 1770 // method ids much, much faster with classes with more than 8 1771 // methods, and has a *substantial* effect on performance with jvmti 1772 // code that loads all jmethodIDs for all classes. 1773 void InstanceKlass::ensure_space_for_methodids(int start_offset) { 1774 int new_jmeths = 0; 1775 int length = methods()->length(); 1776 for (int index = start_offset; index < length; index++) { 1777 Method* m = methods()->at(index); 1778 jmethodID id = m->find_jmethod_id_or_null(); 1779 if (id == NULL) { 1780 new_jmeths++; 1781 } 1782 } 1783 if (new_jmeths != 0) { 1784 Method::ensure_jmethod_ids(class_loader_data(), new_jmeths); 1785 } 1786 } 1787 1788 // Common code to fetch the jmethodID from the cache or update the 1789 // cache with the new jmethodID. This function should never do anything 1790 // that causes the caller to go to a safepoint or we can deadlock with 1791 // the VMThread or have cache consistency issues. 1792 // 1793 jmethodID InstanceKlass::get_jmethod_id_fetch_or_update( 1794 size_t idnum, jmethodID new_id, 1795 jmethodID* new_jmeths, jmethodID* to_dealloc_id_p, 1796 jmethodID** to_dealloc_jmeths_p) { 1797 assert(new_id != NULL, "sanity check"); 1798 assert(to_dealloc_id_p != NULL, "sanity check"); 1799 assert(to_dealloc_jmeths_p != NULL, "sanity check"); 1800 assert(Threads::number_of_threads() == 0 || 1801 SafepointSynchronize::is_at_safepoint() || 1802 JmethodIdCreation_lock->owned_by_self(), "sanity check"); 1803 1804 // reacquire the cache - we are locked, single threaded or at a safepoint 1805 jmethodID* jmeths = methods_jmethod_ids_acquire(); 1806 jmethodID id = NULL; 1807 size_t length = 0; 1808 1809 if (jmeths == NULL || // no cache yet 1810 (length = (size_t)jmeths[0]) <= idnum) { // cache is too short 1811 if (jmeths != NULL) { 1812 // copy any existing entries from the old cache 1813 for (size_t index = 0; index < length; index++) { 1814 new_jmeths[index+1] = jmeths[index+1]; 1815 } 1816 *to_dealloc_jmeths_p = jmeths; // save old cache for later delete 1817 } 1818 release_set_methods_jmethod_ids(jmeths = new_jmeths); 1819 } else { 1820 // fetch jmethodID (if any) from the existing cache 1821 id = jmeths[idnum+1]; 1822 *to_dealloc_jmeths_p = new_jmeths; // save new cache for later delete 1823 } 1824 if (id == NULL) { 1825 // No matching jmethodID in the existing cache or we have a new 1826 // cache or we just grew the cache. This cache write is done here 1827 // by the first thread to win the foot race because a jmethodID 1828 // needs to be unique once it is generally available. 1829 id = new_id; 1830 1831 // The jmethodID cache can be read while unlocked so we have to 1832 // make sure the new jmethodID is complete before installing it 1833 // in the cache. 1834 OrderAccess::release_store(&jmeths[idnum+1], id); 1835 } else { 1836 *to_dealloc_id_p = new_id; // save new id for later delete 1837 } 1838 return id; 1839 } 1840 1841 1842 // Common code to get the jmethodID cache length and the jmethodID 1843 // value at index idnum if there is one. 1844 // 1845 void InstanceKlass::get_jmethod_id_length_value(jmethodID* cache, 1846 size_t idnum, size_t *length_p, jmethodID* id_p) { 1847 assert(cache != NULL, "sanity check"); 1848 assert(length_p != NULL, "sanity check"); 1849 assert(id_p != NULL, "sanity check"); 1850 1851 // cache size is stored in element[0], other elements offset by one 1852 *length_p = (size_t)cache[0]; 1853 if (*length_p <= idnum) { // cache is too short 1854 *id_p = NULL; 1855 } else { 1856 *id_p = cache[idnum+1]; // fetch jmethodID (if any) 1857 } 1858 } 1859 1860 1861 // Lookup a jmethodID, NULL if not found. Do no blocking, no allocations, no handles 1862 jmethodID InstanceKlass::jmethod_id_or_null(Method* method) { 1863 size_t idnum = (size_t)method->method_idnum(); 1864 jmethodID* jmeths = methods_jmethod_ids_acquire(); 1865 size_t length; // length assigned as debugging crumb 1866 jmethodID id = NULL; 1867 if (jmeths != NULL && // If there is a cache 1868 (length = (size_t)jmeths[0]) > idnum) { // and if it is long enough, 1869 id = jmeths[idnum+1]; // Look up the id (may be NULL) 1870 } 1871 return id; 1872 } 1873 1874 inline DependencyContext InstanceKlass::dependencies() { 1875 DependencyContext dep_context(&_dep_context); 1876 return dep_context; 1877 } 1878 1879 int InstanceKlass::mark_dependent_nmethods(KlassDepChange& changes) { 1880 return dependencies().mark_dependent_nmethods(changes); 1881 } 1882 1883 void InstanceKlass::add_dependent_nmethod(nmethod* nm) { 1884 dependencies().add_dependent_nmethod(nm); 1885 } 1886 1887 void InstanceKlass::remove_dependent_nmethod(nmethod* nm, bool delete_immediately) { 1888 dependencies().remove_dependent_nmethod(nm, delete_immediately); 1889 } 1890 1891 #ifndef PRODUCT 1892 void InstanceKlass::print_dependent_nmethods(bool verbose) { 1893 dependencies().print_dependent_nmethods(verbose); 1894 } 1895 1896 bool InstanceKlass::is_dependent_nmethod(nmethod* nm) { 1897 return dependencies().is_dependent_nmethod(nm); 1898 } 1899 #endif //PRODUCT 1900 1901 void InstanceKlass::clean_weak_instanceklass_links() { 1902 clean_implementors_list(); 1903 clean_method_data(); 1904 1905 // Since GC iterates InstanceKlasses sequentially, it is safe to remove stale entries here. 1906 DependencyContext dep_context(&_dep_context); 1907 dep_context.expunge_stale_entries(); 1908 } 1909 1910 void InstanceKlass::clean_implementors_list() { 1911 assert(is_loader_alive(), "this klass should be live"); 1912 if (is_interface()) { 1913 if (ClassUnloading) { 1914 Klass* impl = implementor(); 1915 if (impl != NULL) { 1916 if (!impl->is_loader_alive()) { 1917 // remove this guy 1918 Klass** klass = adr_implementor(); 1919 assert(klass != NULL, "null klass"); 1920 if (klass != NULL) { 1921 *klass = NULL; 1922 } 1923 } 1924 } 1925 } 1926 } 1927 } 1928 1929 void InstanceKlass::clean_method_data() { 1930 for (int m = 0; m < methods()->length(); m++) { 1931 MethodData* mdo = methods()->at(m)->method_data(); 1932 if (mdo != NULL) { 1933 mdo->clean_method_data(/*always_clean*/false); 1934 } 1935 } 1936 } 1937 1938 bool InstanceKlass::supers_have_passed_fingerprint_checks() { 1939 if (java_super() != NULL && !java_super()->has_passed_fingerprint_check()) { 1940 ResourceMark rm; 1941 log_trace(class, fingerprint)("%s : super %s not fingerprinted", external_name(), java_super()->external_name()); 1942 return false; 1943 } 1944 1945 Array<Klass*>* local_interfaces = this->local_interfaces(); 1946 if (local_interfaces != NULL) { 1947 int length = local_interfaces->length(); 1948 for (int i = 0; i < length; i++) { 1949 InstanceKlass* intf = InstanceKlass::cast(local_interfaces->at(i)); 1950 if (!intf->has_passed_fingerprint_check()) { 1951 ResourceMark rm; 1952 log_trace(class, fingerprint)("%s : interface %s not fingerprinted", external_name(), intf->external_name()); 1953 return false; 1954 } 1955 } 1956 } 1957 1958 return true; 1959 } 1960 1961 bool InstanceKlass::should_store_fingerprint(bool is_anonymous) { 1962 #if INCLUDE_AOT 1963 // We store the fingerprint into the InstanceKlass only in the following 2 cases: 1964 if (CalculateClassFingerprint) { 1965 // (1) We are running AOT to generate a shared library. 1966 return true; 1967 } 1968 if (DumpSharedSpaces) { 1969 // (2) We are running -Xshare:dump to create a shared archive 1970 return true; 1971 } 1972 if (UseAOT && is_anonymous) { 1973 // (3) We are using AOT code from a shared library and see an anonymous class 1974 return true; 1975 } 1976 #endif 1977 1978 // In all other cases we might set the _misc_has_passed_fingerprint_check bit, 1979 // but do not store the 64-bit fingerprint to save space. 1980 return false; 1981 } 1982 1983 bool InstanceKlass::has_stored_fingerprint() const { 1984 #if INCLUDE_AOT 1985 return should_store_fingerprint() || is_shared(); 1986 #else 1987 return false; 1988 #endif 1989 } 1990 1991 uint64_t InstanceKlass::get_stored_fingerprint() const { 1992 address adr = adr_fingerprint(); 1993 if (adr != NULL) { 1994 return (uint64_t)Bytes::get_native_u8(adr); // adr may not be 64-bit aligned 1995 } 1996 return 0; 1997 } 1998 1999 void InstanceKlass::store_fingerprint(uint64_t fingerprint) { 2000 address adr = adr_fingerprint(); 2001 if (adr != NULL) { 2002 Bytes::put_native_u8(adr, (u8)fingerprint); // adr may not be 64-bit aligned 2003 2004 ResourceMark rm; 2005 log_trace(class, fingerprint)("stored as " PTR64_FORMAT " for class %s", fingerprint, external_name()); 2006 } 2007 } 2008 2009 void InstanceKlass::metaspace_pointers_do(MetaspaceClosure* it) { 2010 Klass::metaspace_pointers_do(it); 2011 2012 if (log_is_enabled(Trace, cds)) { 2013 ResourceMark rm; 2014 log_trace(cds)("Iter(InstanceKlass): %p (%s)", this, external_name()); 2015 } 2016 2017 it->push(&_annotations); 2018 it->push((Klass**)&_array_klasses); 2019 it->push(&_constants); 2020 it->push(&_inner_classes); 2021 it->push(&_array_name); 2022 #if INCLUDE_JVMTI 2023 it->push(&_previous_versions); 2024 #endif 2025 it->push(&_methods); 2026 it->push(&_default_methods); 2027 it->push(&_local_interfaces); 2028 it->push(&_transitive_interfaces); 2029 it->push(&_method_ordering); 2030 it->push(&_default_vtable_indices); 2031 it->push(&_fields); 2032 2033 if (itable_length() > 0) { 2034 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable(); 2035 int method_table_offset_in_words = ioe->offset()/wordSize; 2036 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words()) 2037 / itableOffsetEntry::size(); 2038 2039 for (int i = 0; i < nof_interfaces; i ++, ioe ++) { 2040 if (ioe->interface_klass() != NULL) { 2041 it->push(ioe->interface_klass_addr()); 2042 itableMethodEntry* ime = ioe->first_method_entry(this); 2043 int n = klassItable::method_count_for_interface(ioe->interface_klass()); 2044 for (int index = 0; index < n; index ++) { 2045 it->push(ime[index].method_addr()); 2046 } 2047 } 2048 } 2049 } 2050 } 2051 2052 void InstanceKlass::remove_unshareable_info() { 2053 Klass::remove_unshareable_info(); 2054 2055 if (is_in_error_state()) { 2056 // Classes are attempted to link during dumping and may fail, 2057 // but these classes are still in the dictionary and class list in CLD. 2058 // Check in_error state first because in_error is > linked state, so 2059 // is_linked() is true. 2060 // If there's a linking error, there is nothing else to remove. 2061 return; 2062 } 2063 2064 // Unlink the class 2065 if (is_linked()) { 2066 unlink_class(); 2067 } 2068 init_implementor(); 2069 2070 constants()->remove_unshareable_info(); 2071 2072 for (int i = 0; i < methods()->length(); i++) { 2073 Method* m = methods()->at(i); 2074 m->remove_unshareable_info(); 2075 } 2076 2077 // do array classes also. 2078 if (array_klasses() != NULL) { 2079 array_klasses()->remove_unshareable_info(); 2080 } 2081 2082 // These are not allocated from metaspace, but they should should all be empty 2083 // during dump time, so we don't need to worry about them in InstanceKlass::iterate(). 2084 guarantee(_source_debug_extension == NULL, "must be"); 2085 guarantee(_dep_context == DependencyContext::EMPTY, "must be"); 2086 guarantee(_osr_nmethods_head == NULL, "must be"); 2087 2088 #if INCLUDE_JVMTI 2089 guarantee(_breakpoints == NULL, "must be"); 2090 guarantee(_previous_versions == NULL, "must be"); 2091 #endif 2092 2093 _init_thread = NULL; 2094 _methods_jmethod_ids = NULL; 2095 _jni_ids = NULL; 2096 _oop_map_cache = NULL; 2097 } 2098 2099 void InstanceKlass::remove_java_mirror() { 2100 Klass::remove_java_mirror(); 2101 2102 // do array classes also. 2103 if (array_klasses() != NULL) { 2104 array_klasses()->remove_java_mirror(); 2105 } 2106 } 2107 2108 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS) { 2109 set_package(loader_data, CHECK); 2110 Klass::restore_unshareable_info(loader_data, protection_domain, CHECK); 2111 2112 Array<Method*>* methods = this->methods(); 2113 int num_methods = methods->length(); 2114 for (int index2 = 0; index2 < num_methods; ++index2) { 2115 methodHandle m(THREAD, methods->at(index2)); 2116 m->restore_unshareable_info(CHECK); 2117 } 2118 if (JvmtiExport::has_redefined_a_class()) { 2119 // Reinitialize vtable because RedefineClasses may have changed some 2120 // entries in this vtable for super classes so the CDS vtable might 2121 // point to old or obsolete entries. RedefineClasses doesn't fix up 2122 // vtables in the shared system dictionary, only the main one. 2123 // It also redefines the itable too so fix that too. 2124 ResourceMark rm(THREAD); 2125 vtable().initialize_vtable(false, CHECK); 2126 itable().initialize_itable(false, CHECK); 2127 } 2128 2129 // restore constant pool resolved references 2130 constants()->restore_unshareable_info(CHECK); 2131 2132 if (array_klasses() != NULL) { 2133 // Array classes have null protection domain. 2134 // --> see ArrayKlass::complete_create_array_klass() 2135 array_klasses()->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK); 2136 } 2137 } 2138 2139 // returns true IFF is_in_error_state() has been changed as a result of this call. 2140 bool InstanceKlass::check_sharing_error_state() { 2141 assert(DumpSharedSpaces, "should only be called during dumping"); 2142 bool old_state = is_in_error_state(); 2143 2144 if (!is_in_error_state()) { 2145 bool bad = false; 2146 for (InstanceKlass* sup = java_super(); sup; sup = sup->java_super()) { 2147 if (sup->is_in_error_state()) { 2148 bad = true; 2149 break; 2150 } 2151 } 2152 if (!bad) { 2153 Array<Klass*>* interfaces = transitive_interfaces(); 2154 for (int i = 0; i < interfaces->length(); i++) { 2155 Klass* iface = interfaces->at(i); 2156 if (InstanceKlass::cast(iface)->is_in_error_state()) { 2157 bad = true; 2158 break; 2159 } 2160 } 2161 } 2162 2163 if (bad) { 2164 set_in_error_state(); 2165 } 2166 } 2167 2168 return (old_state != is_in_error_state()); 2169 } 2170 2171 #if INCLUDE_JVMTI 2172 static void clear_all_breakpoints(Method* m) { 2173 m->clear_all_breakpoints(); 2174 } 2175 #endif 2176 2177 void InstanceKlass::notify_unload_class(InstanceKlass* ik) { 2178 // notify the debugger 2179 if (JvmtiExport::should_post_class_unload()) { 2180 JvmtiExport::post_class_unload(ik); 2181 } 2182 2183 // notify ClassLoadingService of class unload 2184 ClassLoadingService::notify_class_unloaded(ik); 2185 } 2186 2187 void InstanceKlass::release_C_heap_structures(InstanceKlass* ik) { 2188 // Clean up C heap 2189 ik->release_C_heap_structures(); 2190 ik->constants()->release_C_heap_structures(); 2191 } 2192 2193 void InstanceKlass::release_C_heap_structures() { 2194 // Can't release the constant pool here because the constant pool can be 2195 // deallocated separately from the InstanceKlass for default methods and 2196 // redefine classes. 2197 2198 // Deallocate oop map cache 2199 if (_oop_map_cache != NULL) { 2200 delete _oop_map_cache; 2201 _oop_map_cache = NULL; 2202 } 2203 2204 // Deallocate JNI identifiers for jfieldIDs 2205 JNIid::deallocate(jni_ids()); 2206 set_jni_ids(NULL); 2207 2208 jmethodID* jmeths = methods_jmethod_ids_acquire(); 2209 if (jmeths != (jmethodID*)NULL) { 2210 release_set_methods_jmethod_ids(NULL); 2211 FreeHeap(jmeths); 2212 } 2213 2214 // Release dependencies. 2215 // It is desirable to use DC::remove_all_dependents() here, but, unfortunately, 2216 // it is not safe (see JDK-8143408). The problem is that the klass dependency 2217 // context can contain live dependencies, since there's a race between nmethod & 2218 // klass unloading. If the klass is dead when nmethod unloading happens, relevant 2219 // dependencies aren't removed from the context associated with the class (see 2220 // nmethod::flush_dependencies). It ends up during klass unloading as seemingly 2221 // live dependencies pointing to unloaded nmethods and causes a crash in 2222 // DC::remove_all_dependents() when it touches unloaded nmethod. 2223 dependencies().wipe(); 2224 2225 #if INCLUDE_JVMTI 2226 // Deallocate breakpoint records 2227 if (breakpoints() != 0x0) { 2228 methods_do(clear_all_breakpoints); 2229 assert(breakpoints() == 0x0, "should have cleared breakpoints"); 2230 } 2231 2232 // deallocate the cached class file 2233 if (_cached_class_file != NULL && !MetaspaceShared::is_in_shared_metaspace(_cached_class_file)) { 2234 os::free(_cached_class_file); 2235 _cached_class_file = NULL; 2236 } 2237 #endif 2238 2239 // Decrement symbol reference counts associated with the unloaded class. 2240 if (_name != NULL) _name->decrement_refcount(); 2241 // unreference array name derived from this class name (arrays of an unloaded 2242 // class can't be referenced anymore). 2243 if (_array_name != NULL) _array_name->decrement_refcount(); 2244 if (_source_debug_extension != NULL) FREE_C_HEAP_ARRAY(char, _source_debug_extension); 2245 } 2246 2247 void InstanceKlass::set_source_debug_extension(const char* array, int length) { 2248 if (array == NULL) { 2249 _source_debug_extension = NULL; 2250 } else { 2251 // Adding one to the attribute length in order to store a null terminator 2252 // character could cause an overflow because the attribute length is 2253 // already coded with an u4 in the classfile, but in practice, it's 2254 // unlikely to happen. 2255 assert((length+1) > length, "Overflow checking"); 2256 char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass); 2257 for (int i = 0; i < length; i++) { 2258 sde[i] = array[i]; 2259 } 2260 sde[length] = '\0'; 2261 _source_debug_extension = sde; 2262 } 2263 } 2264 2265 const char* InstanceKlass::signature_name() const { 2266 int hash_len = 0; 2267 char hash_buf[40]; 2268 2269 // If this is an anonymous class, append a hash to make the name unique 2270 if (is_anonymous()) { 2271 intptr_t hash = (java_mirror() != NULL) ? java_mirror()->identity_hash() : 0; 2272 jio_snprintf(hash_buf, sizeof(hash_buf), "/" UINTX_FORMAT, (uintx)hash); 2273 hash_len = (int)strlen(hash_buf); 2274 } 2275 2276 // Get the internal name as a c string 2277 const char* src = (const char*) (name()->as_C_string()); 2278 const int src_length = (int)strlen(src); 2279 2280 char* dest = NEW_RESOURCE_ARRAY(char, src_length + hash_len + 3); 2281 2282 // Add L as type indicator 2283 int dest_index = 0; 2284 dest[dest_index++] = 'L'; 2285 2286 // Add the actual class name 2287 for (int src_index = 0; src_index < src_length; ) { 2288 dest[dest_index++] = src[src_index++]; 2289 } 2290 2291 // If we have a hash, append it 2292 for (int hash_index = 0; hash_index < hash_len; ) { 2293 dest[dest_index++] = hash_buf[hash_index++]; 2294 } 2295 2296 // Add the semicolon and the NULL 2297 dest[dest_index++] = ';'; 2298 dest[dest_index] = '\0'; 2299 return dest; 2300 } 2301 2302 // Used to obtain the package name from a fully qualified class name. 2303 Symbol* InstanceKlass::package_from_name(const Symbol* name, TRAPS) { 2304 if (name == NULL) { 2305 return NULL; 2306 } else { 2307 if (name->utf8_length() <= 0) { 2308 return NULL; 2309 } 2310 ResourceMark rm; 2311 const char* package_name = ClassLoader::package_from_name((const char*) name->as_C_string()); 2312 if (package_name == NULL) { 2313 return NULL; 2314 } 2315 Symbol* pkg_name = SymbolTable::new_symbol(package_name, THREAD); 2316 return pkg_name; 2317 } 2318 } 2319 2320 ModuleEntry* InstanceKlass::module() const { 2321 if (!in_unnamed_package()) { 2322 return _package_entry->module(); 2323 } 2324 const Klass* host = host_klass(); 2325 if (host == NULL) { 2326 return class_loader_data()->unnamed_module(); 2327 } 2328 return host->class_loader_data()->unnamed_module(); 2329 } 2330 2331 void InstanceKlass::set_package(ClassLoaderData* loader_data, TRAPS) { 2332 2333 // ensure java/ packages only loaded by boot or platform builtin loaders 2334 Handle class_loader(THREAD, loader_data->class_loader()); 2335 check_prohibited_package(name(), class_loader, CHECK); 2336 2337 TempNewSymbol pkg_name = package_from_name(name(), CHECK); 2338 2339 if (pkg_name != NULL && loader_data != NULL) { 2340 2341 // Find in class loader's package entry table. 2342 _package_entry = loader_data->packages()->lookup_only(pkg_name); 2343 2344 // If the package name is not found in the loader's package 2345 // entry table, it is an indication that the package has not 2346 // been defined. Consider it defined within the unnamed module. 2347 if (_package_entry == NULL) { 2348 ResourceMark rm; 2349 2350 if (!ModuleEntryTable::javabase_defined()) { 2351 // Before java.base is defined during bootstrapping, define all packages in 2352 // the java.base module. If a non-java.base package is erroneously placed 2353 // in the java.base module it will be caught later when java.base 2354 // is defined by ModuleEntryTable::verify_javabase_packages check. 2355 assert(ModuleEntryTable::javabase_moduleEntry() != NULL, JAVA_BASE_NAME " module is NULL"); 2356 _package_entry = loader_data->packages()->lookup(pkg_name, ModuleEntryTable::javabase_moduleEntry()); 2357 } else { 2358 assert(loader_data->unnamed_module() != NULL, "unnamed module is NULL"); 2359 _package_entry = loader_data->packages()->lookup(pkg_name, 2360 loader_data->unnamed_module()); 2361 } 2362 2363 // A package should have been successfully created 2364 assert(_package_entry != NULL, "Package entry for class %s not found, loader %s", 2365 name()->as_C_string(), loader_data->loader_name()); 2366 } 2367 2368 if (log_is_enabled(Debug, module)) { 2369 ResourceMark rm; 2370 ModuleEntry* m = _package_entry->module(); 2371 log_trace(module)("Setting package: class: %s, package: %s, loader: %s, module: %s", 2372 external_name(), 2373 pkg_name->as_C_string(), 2374 loader_data->loader_name(), 2375 (m->is_named() ? m->name()->as_C_string() : UNNAMED_MODULE)); 2376 } 2377 } else { 2378 ResourceMark rm; 2379 log_trace(module)("Setting package: class: %s, package: unnamed, loader: %s, module: %s", 2380 external_name(), 2381 (loader_data != NULL) ? loader_data->loader_name() : "NULL", 2382 UNNAMED_MODULE); 2383 } 2384 } 2385 2386 2387 // different versions of is_same_class_package 2388 2389 bool InstanceKlass::is_same_class_package(const Klass* class2) const { 2390 oop classloader1 = this->class_loader(); 2391 PackageEntry* classpkg1 = this->package(); 2392 if (class2->is_objArray_klass()) { 2393 class2 = ObjArrayKlass::cast(class2)->bottom_klass(); 2394 } 2395 2396 oop classloader2; 2397 PackageEntry* classpkg2; 2398 if (class2->is_instance_klass()) { 2399 classloader2 = class2->class_loader(); 2400 classpkg2 = class2->package(); 2401 } else { 2402 assert(class2->is_typeArray_klass(), "should be type array"); 2403 classloader2 = NULL; 2404 classpkg2 = NULL; 2405 } 2406 2407 // Same package is determined by comparing class loader 2408 // and package entries. Both must be the same. This rule 2409 // applies even to classes that are defined in the unnamed 2410 // package, they still must have the same class loader. 2411 if (oopDesc::equals(classloader1, classloader2) && (classpkg1 == classpkg2)) { 2412 return true; 2413 } 2414 2415 return false; 2416 } 2417 2418 // return true if this class and other_class are in the same package. Classloader 2419 // and classname information is enough to determine a class's package 2420 bool InstanceKlass::is_same_class_package(oop other_class_loader, 2421 const Symbol* other_class_name) const { 2422 if (!oopDesc::equals(class_loader(), other_class_loader)) { 2423 return false; 2424 } 2425 if (name()->fast_compare(other_class_name) == 0) { 2426 return true; 2427 } 2428 2429 { 2430 ResourceMark rm; 2431 2432 bool bad_class_name = false; 2433 const char* other_pkg = 2434 ClassLoader::package_from_name((const char*) other_class_name->as_C_string(), &bad_class_name); 2435 if (bad_class_name) { 2436 return false; 2437 } 2438 // Check that package_from_name() returns NULL, not "", if there is no package. 2439 assert(other_pkg == NULL || strlen(other_pkg) > 0, "package name is empty string"); 2440 2441 const Symbol* const this_package_name = 2442 this->package() != NULL ? this->package()->name() : NULL; 2443 2444 if (this_package_name == NULL || other_pkg == NULL) { 2445 // One of the two doesn't have a package. Only return true if the other 2446 // one also doesn't have a package. 2447 return (const char*)this_package_name == other_pkg; 2448 } 2449 2450 // Check if package is identical 2451 return this_package_name->equals(other_pkg); 2452 } 2453 } 2454 2455 // Returns true iff super_method can be overridden by a method in targetclassname 2456 // See JLS 3rd edition 8.4.6.1 2457 // Assumes name-signature match 2458 // "this" is InstanceKlass of super_method which must exist 2459 // note that the InstanceKlass of the method in the targetclassname has not always been created yet 2460 bool InstanceKlass::is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS) { 2461 // Private methods can not be overridden 2462 if (super_method->is_private()) { 2463 return false; 2464 } 2465 // If super method is accessible, then override 2466 if ((super_method->is_protected()) || 2467 (super_method->is_public())) { 2468 return true; 2469 } 2470 // Package-private methods are not inherited outside of package 2471 assert(super_method->is_package_private(), "must be package private"); 2472 return(is_same_class_package(targetclassloader(), targetclassname)); 2473 } 2474 2475 // Only boot and platform class loaders can define classes in "java/" packages. 2476 void InstanceKlass::check_prohibited_package(Symbol* class_name, 2477 Handle class_loader, 2478 TRAPS) { 2479 if (!class_loader.is_null() && 2480 !SystemDictionary::is_platform_class_loader(class_loader()) && 2481 class_name != NULL) { 2482 ResourceMark rm(THREAD); 2483 char* name = class_name->as_C_string(); 2484 if (strncmp(name, JAVAPKG, JAVAPKG_LEN) == 0 && name[JAVAPKG_LEN] == '/') { 2485 TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK); 2486 assert(pkg_name != NULL, "Error in parsing package name starting with 'java/'"); 2487 name = pkg_name->as_C_string(); 2488 const char* class_loader_name = SystemDictionary::loader_name(class_loader()); 2489 StringUtils::replace_no_expand(name, "/", "."); 2490 const char* msg_text1 = "Class loader (instance of): "; 2491 const char* msg_text2 = " tried to load prohibited package name: "; 2492 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + strlen(name) + 1; 2493 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len); 2494 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, name); 2495 THROW_MSG(vmSymbols::java_lang_SecurityException(), message); 2496 } 2497 } 2498 return; 2499 } 2500 2501 // tell if two classes have the same enclosing class (at package level) 2502 bool InstanceKlass::is_same_package_member(const Klass* class2, TRAPS) const { 2503 if (class2 == this) return true; 2504 if (!class2->is_instance_klass()) return false; 2505 2506 // must be in same package before we try anything else 2507 if (!is_same_class_package(class2)) 2508 return false; 2509 2510 // As long as there is an outer_this.getEnclosingClass, 2511 // shift the search outward. 2512 const InstanceKlass* outer_this = this; 2513 for (;;) { 2514 // As we walk along, look for equalities between outer_this and class2. 2515 // Eventually, the walks will terminate as outer_this stops 2516 // at the top-level class around the original class. 2517 bool ignore_inner_is_member; 2518 const Klass* next = outer_this->compute_enclosing_class(&ignore_inner_is_member, 2519 CHECK_false); 2520 if (next == NULL) break; 2521 if (next == class2) return true; 2522 outer_this = InstanceKlass::cast(next); 2523 } 2524 2525 // Now do the same for class2. 2526 const InstanceKlass* outer2 = InstanceKlass::cast(class2); 2527 for (;;) { 2528 bool ignore_inner_is_member; 2529 Klass* next = outer2->compute_enclosing_class(&ignore_inner_is_member, 2530 CHECK_false); 2531 if (next == NULL) break; 2532 // Might as well check the new outer against all available values. 2533 if (next == this) return true; 2534 if (next == outer_this) return true; 2535 outer2 = InstanceKlass::cast(next); 2536 } 2537 2538 // If by this point we have not found an equality between the 2539 // two classes, we know they are in separate package members. 2540 return false; 2541 } 2542 2543 bool InstanceKlass::find_inner_classes_attr(int* ooff, int* noff, TRAPS) const { 2544 constantPoolHandle i_cp(THREAD, constants()); 2545 for (InnerClassesIterator iter(this); !iter.done(); iter.next()) { 2546 int ioff = iter.inner_class_info_index(); 2547 if (ioff != 0) { 2548 // Check to see if the name matches the class we're looking for 2549 // before attempting to find the class. 2550 if (i_cp->klass_name_at_matches(this, ioff)) { 2551 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_false); 2552 if (this == inner_klass) { 2553 *ooff = iter.outer_class_info_index(); 2554 *noff = iter.inner_name_index(); 2555 return true; 2556 } 2557 } 2558 } 2559 } 2560 return false; 2561 } 2562 2563 InstanceKlass* InstanceKlass::compute_enclosing_class(bool* inner_is_member, TRAPS) const { 2564 InstanceKlass* outer_klass = NULL; 2565 *inner_is_member = false; 2566 int ooff = 0, noff = 0; 2567 bool has_inner_classes_attr = find_inner_classes_attr(&ooff, &noff, THREAD); 2568 if (has_inner_classes_attr) { 2569 constantPoolHandle i_cp(THREAD, constants()); 2570 if (ooff != 0) { 2571 Klass* ok = i_cp->klass_at(ooff, CHECK_NULL); 2572 outer_klass = InstanceKlass::cast(ok); 2573 *inner_is_member = true; 2574 } 2575 if (NULL == outer_klass) { 2576 // It may be anonymous; try for that. 2577 int encl_method_class_idx = enclosing_method_class_index(); 2578 if (encl_method_class_idx != 0) { 2579 Klass* ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL); 2580 outer_klass = InstanceKlass::cast(ok); 2581 *inner_is_member = false; 2582 } 2583 } 2584 } 2585 2586 // If no inner class attribute found for this class. 2587 if (NULL == outer_klass) return NULL; 2588 2589 // Throws an exception if outer klass has not declared k as an inner klass 2590 // We need evidence that each klass knows about the other, or else 2591 // the system could allow a spoof of an inner class to gain access rights. 2592 Reflection::check_for_inner_class(outer_klass, this, *inner_is_member, CHECK_NULL); 2593 return outer_klass; 2594 } 2595 2596 jint InstanceKlass::compute_modifier_flags(TRAPS) const { 2597 jint access = access_flags().as_int(); 2598 2599 // But check if it happens to be member class. 2600 InnerClassesIterator iter(this); 2601 for (; !iter.done(); iter.next()) { 2602 int ioff = iter.inner_class_info_index(); 2603 // Inner class attribute can be zero, skip it. 2604 // Strange but true: JVM spec. allows null inner class refs. 2605 if (ioff == 0) continue; 2606 2607 // only look at classes that are already loaded 2608 // since we are looking for the flags for our self. 2609 Symbol* inner_name = constants()->klass_name_at(ioff); 2610 if (name() == inner_name) { 2611 // This is really a member class. 2612 access = iter.inner_access_flags(); 2613 break; 2614 } 2615 } 2616 // Remember to strip ACC_SUPER bit 2617 return (access & (~JVM_ACC_SUPER)) & JVM_ACC_WRITTEN_FLAGS; 2618 } 2619 2620 jint InstanceKlass::jvmti_class_status() const { 2621 jint result = 0; 2622 2623 if (is_linked()) { 2624 result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED; 2625 } 2626 2627 if (is_initialized()) { 2628 assert(is_linked(), "Class status is not consistent"); 2629 result |= JVMTI_CLASS_STATUS_INITIALIZED; 2630 } 2631 if (is_in_error_state()) { 2632 result |= JVMTI_CLASS_STATUS_ERROR; 2633 } 2634 return result; 2635 } 2636 2637 Method* InstanceKlass::method_at_itable(Klass* holder, int index, TRAPS) { 2638 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable(); 2639 int method_table_offset_in_words = ioe->offset()/wordSize; 2640 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words()) 2641 / itableOffsetEntry::size(); 2642 2643 for (int cnt = 0 ; ; cnt ++, ioe ++) { 2644 // If the interface isn't implemented by the receiver class, 2645 // the VM should throw IncompatibleClassChangeError. 2646 if (cnt >= nof_interfaces) { 2647 THROW_NULL(vmSymbols::java_lang_IncompatibleClassChangeError()); 2648 } 2649 2650 Klass* ik = ioe->interface_klass(); 2651 if (ik == holder) break; 2652 } 2653 2654 itableMethodEntry* ime = ioe->first_method_entry(this); 2655 Method* m = ime[index].method(); 2656 if (m == NULL) { 2657 THROW_NULL(vmSymbols::java_lang_AbstractMethodError()); 2658 } 2659 return m; 2660 } 2661 2662 2663 #if INCLUDE_JVMTI 2664 // update default_methods for redefineclasses for methods that are 2665 // not yet in the vtable due to concurrent subclass define and superinterface 2666 // redefinition 2667 // Note: those in the vtable, should have been updated via adjust_method_entries 2668 void InstanceKlass::adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed) { 2669 // search the default_methods for uses of either obsolete or EMCP methods 2670 if (default_methods() != NULL) { 2671 for (int index = 0; index < default_methods()->length(); index ++) { 2672 Method* old_method = default_methods()->at(index); 2673 if (old_method == NULL || old_method->method_holder() != holder || !old_method->is_old()) { 2674 continue; // skip uninteresting entries 2675 } 2676 assert(!old_method->is_deleted(), "default methods may not be deleted"); 2677 2678 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum()); 2679 2680 assert(new_method != NULL, "method_with_idnum() should not be NULL"); 2681 assert(old_method != new_method, "sanity check"); 2682 2683 default_methods()->at_put(index, new_method); 2684 if (log_is_enabled(Info, redefine, class, update)) { 2685 ResourceMark rm; 2686 if (!(*trace_name_printed)) { 2687 log_info(redefine, class, update) 2688 ("adjust: klassname=%s default methods from name=%s", 2689 external_name(), old_method->method_holder()->external_name()); 2690 *trace_name_printed = true; 2691 } 2692 log_debug(redefine, class, update, vtables) 2693 ("default method update: %s(%s) ", 2694 new_method->name()->as_C_string(), new_method->signature()->as_C_string()); 2695 } 2696 } 2697 } 2698 } 2699 #endif // INCLUDE_JVMTI 2700 2701 // On-stack replacement stuff 2702 void InstanceKlass::add_osr_nmethod(nmethod* n) { 2703 // only one compilation can be active 2704 { 2705 // This is a short non-blocking critical region, so the no safepoint check is ok. 2706 MutexLockerEx ml(OsrList_lock, Mutex::_no_safepoint_check_flag); 2707 assert(n->is_osr_method(), "wrong kind of nmethod"); 2708 n->set_osr_link(osr_nmethods_head()); 2709 set_osr_nmethods_head(n); 2710 // Raise the highest osr level if necessary 2711 if (TieredCompilation) { 2712 Method* m = n->method(); 2713 m->set_highest_osr_comp_level(MAX2(m->highest_osr_comp_level(), n->comp_level())); 2714 } 2715 } 2716 2717 // Get rid of the osr methods for the same bci that have lower levels. 2718 if (TieredCompilation) { 2719 for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) { 2720 nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true); 2721 if (inv != NULL && inv->is_in_use()) { 2722 inv->make_not_entrant(); 2723 } 2724 } 2725 } 2726 } 2727 2728 // Remove osr nmethod from the list. Return true if found and removed. 2729 bool InstanceKlass::remove_osr_nmethod(nmethod* n) { 2730 // This is a short non-blocking critical region, so the no safepoint check is ok. 2731 MutexLockerEx ml(OsrList_lock, Mutex::_no_safepoint_check_flag); 2732 assert(n->is_osr_method(), "wrong kind of nmethod"); 2733 nmethod* last = NULL; 2734 nmethod* cur = osr_nmethods_head(); 2735 int max_level = CompLevel_none; // Find the max comp level excluding n 2736 Method* m = n->method(); 2737 // Search for match 2738 bool found = false; 2739 while(cur != NULL && cur != n) { 2740 if (TieredCompilation && m == cur->method()) { 2741 // Find max level before n 2742 max_level = MAX2(max_level, cur->comp_level()); 2743 } 2744 last = cur; 2745 cur = cur->osr_link(); 2746 } 2747 nmethod* next = NULL; 2748 if (cur == n) { 2749 found = true; 2750 next = cur->osr_link(); 2751 if (last == NULL) { 2752 // Remove first element 2753 set_osr_nmethods_head(next); 2754 } else { 2755 last->set_osr_link(next); 2756 } 2757 } 2758 n->set_osr_link(NULL); 2759 if (TieredCompilation) { 2760 cur = next; 2761 while (cur != NULL) { 2762 // Find max level after n 2763 if (m == cur->method()) { 2764 max_level = MAX2(max_level, cur->comp_level()); 2765 } 2766 cur = cur->osr_link(); 2767 } 2768 m->set_highest_osr_comp_level(max_level); 2769 } 2770 return found; 2771 } 2772 2773 int InstanceKlass::mark_osr_nmethods(const Method* m) { 2774 // This is a short non-blocking critical region, so the no safepoint check is ok. 2775 MutexLockerEx ml(OsrList_lock, Mutex::_no_safepoint_check_flag); 2776 nmethod* osr = osr_nmethods_head(); 2777 int found = 0; 2778 while (osr != NULL) { 2779 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain"); 2780 if (osr->method() == m) { 2781 osr->mark_for_deoptimization(); 2782 found++; 2783 } 2784 osr = osr->osr_link(); 2785 } 2786 return found; 2787 } 2788 2789 nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const { 2790 // This is a short non-blocking critical region, so the no safepoint check is ok. 2791 MutexLockerEx ml(OsrList_lock, Mutex::_no_safepoint_check_flag); 2792 nmethod* osr = osr_nmethods_head(); 2793 nmethod* best = NULL; 2794 while (osr != NULL) { 2795 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain"); 2796 // There can be a time when a c1 osr method exists but we are waiting 2797 // for a c2 version. When c2 completes its osr nmethod we will trash 2798 // the c1 version and only be able to find the c2 version. However 2799 // while we overflow in the c1 code at back branches we don't want to 2800 // try and switch to the same code as we are already running 2801 2802 if (osr->method() == m && 2803 (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) { 2804 if (match_level) { 2805 if (osr->comp_level() == comp_level) { 2806 // Found a match - return it. 2807 return osr; 2808 } 2809 } else { 2810 if (best == NULL || (osr->comp_level() > best->comp_level())) { 2811 if (osr->comp_level() == CompLevel_highest_tier) { 2812 // Found the best possible - return it. 2813 return osr; 2814 } 2815 best = osr; 2816 } 2817 } 2818 } 2819 osr = osr->osr_link(); 2820 } 2821 if (best != NULL && best->comp_level() >= comp_level && match_level == false) { 2822 return best; 2823 } 2824 return NULL; 2825 } 2826 2827 // ----------------------------------------------------------------------------------------------------- 2828 // Printing 2829 2830 #ifndef PRODUCT 2831 2832 #define BULLET " - " 2833 2834 static const char* state_names[] = { 2835 "allocated", "loaded", "linked", "being_initialized", "fully_initialized", "initialization_error" 2836 }; 2837 2838 static void print_vtable(intptr_t* start, int len, outputStream* st) { 2839 for (int i = 0; i < len; i++) { 2840 intptr_t e = start[i]; 2841 st->print("%d : " INTPTR_FORMAT, i, e); 2842 if (e != 0 && ((Metadata*)e)->is_metaspace_object()) { 2843 st->print(" "); 2844 ((Metadata*)e)->print_value_on(st); 2845 } 2846 st->cr(); 2847 } 2848 } 2849 2850 static void print_vtable(vtableEntry* start, int len, outputStream* st) { 2851 return print_vtable(reinterpret_cast<intptr_t*>(start), len, st); 2852 } 2853 2854 void InstanceKlass::print_on(outputStream* st) const { 2855 assert(is_klass(), "must be klass"); 2856 Klass::print_on(st); 2857 2858 st->print(BULLET"instance size: %d", size_helper()); st->cr(); 2859 st->print(BULLET"klass size: %d", size()); st->cr(); 2860 st->print(BULLET"access: "); access_flags().print_on(st); st->cr(); 2861 st->print(BULLET"state: "); st->print_cr("%s", state_names[_init_state]); 2862 st->print(BULLET"name: "); name()->print_value_on(st); st->cr(); 2863 st->print(BULLET"super: "); super()->print_value_on_maybe_null(st); st->cr(); 2864 st->print(BULLET"sub: "); 2865 Klass* sub = subklass(); 2866 int n; 2867 for (n = 0; sub != NULL; n++, sub = sub->next_sibling()) { 2868 if (n < MaxSubklassPrintSize) { 2869 sub->print_value_on(st); 2870 st->print(" "); 2871 } 2872 } 2873 if (n >= MaxSubklassPrintSize) st->print("(" INTX_FORMAT " more klasses...)", n - MaxSubklassPrintSize); 2874 st->cr(); 2875 2876 if (is_interface()) { 2877 st->print_cr(BULLET"nof implementors: %d", nof_implementors()); 2878 if (nof_implementors() == 1) { 2879 st->print_cr(BULLET"implementor: "); 2880 st->print(" "); 2881 implementor()->print_value_on(st); 2882 st->cr(); 2883 } 2884 } 2885 2886 st->print(BULLET"arrays: "); array_klasses()->print_value_on_maybe_null(st); st->cr(); 2887 st->print(BULLET"methods: "); methods()->print_value_on(st); st->cr(); 2888 if (Verbose || WizardMode) { 2889 Array<Method*>* method_array = methods(); 2890 for (int i = 0; i < method_array->length(); i++) { 2891 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr(); 2892 } 2893 } 2894 st->print(BULLET"method ordering: "); method_ordering()->print_value_on(st); st->cr(); 2895 st->print(BULLET"default_methods: "); default_methods()->print_value_on(st); st->cr(); 2896 if (Verbose && default_methods() != NULL) { 2897 Array<Method*>* method_array = default_methods(); 2898 for (int i = 0; i < method_array->length(); i++) { 2899 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr(); 2900 } 2901 } 2902 if (default_vtable_indices() != NULL) { 2903 st->print(BULLET"default vtable indices: "); default_vtable_indices()->print_value_on(st); st->cr(); 2904 } 2905 st->print(BULLET"local interfaces: "); local_interfaces()->print_value_on(st); st->cr(); 2906 st->print(BULLET"trans. interfaces: "); transitive_interfaces()->print_value_on(st); st->cr(); 2907 st->print(BULLET"constants: "); constants()->print_value_on(st); st->cr(); 2908 if (class_loader_data() != NULL) { 2909 st->print(BULLET"class loader data: "); 2910 class_loader_data()->print_value_on(st); 2911 st->cr(); 2912 } 2913 st->print(BULLET"host class: "); host_klass()->print_value_on_maybe_null(st); st->cr(); 2914 if (source_file_name() != NULL) { 2915 st->print(BULLET"source file: "); 2916 source_file_name()->print_value_on(st); 2917 st->cr(); 2918 } 2919 if (source_debug_extension() != NULL) { 2920 st->print(BULLET"source debug extension: "); 2921 st->print("%s", source_debug_extension()); 2922 st->cr(); 2923 } 2924 st->print(BULLET"class annotations: "); class_annotations()->print_value_on(st); st->cr(); 2925 st->print(BULLET"class type annotations: "); class_type_annotations()->print_value_on(st); st->cr(); 2926 st->print(BULLET"field annotations: "); fields_annotations()->print_value_on(st); st->cr(); 2927 st->print(BULLET"field type annotations: "); fields_type_annotations()->print_value_on(st); st->cr(); 2928 { 2929 bool have_pv = false; 2930 // previous versions are linked together through the InstanceKlass 2931 for (InstanceKlass* pv_node = previous_versions(); 2932 pv_node != NULL; 2933 pv_node = pv_node->previous_versions()) { 2934 if (!have_pv) 2935 st->print(BULLET"previous version: "); 2936 have_pv = true; 2937 pv_node->constants()->print_value_on(st); 2938 } 2939 if (have_pv) st->cr(); 2940 } 2941 2942 if (generic_signature() != NULL) { 2943 st->print(BULLET"generic signature: "); 2944 generic_signature()->print_value_on(st); 2945 st->cr(); 2946 } 2947 st->print(BULLET"inner classes: "); inner_classes()->print_value_on(st); st->cr(); 2948 st->print(BULLET"java mirror: "); java_mirror()->print_value_on(st); st->cr(); 2949 st->print(BULLET"vtable length %d (start addr: " INTPTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr(); 2950 if (vtable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_vtable(), vtable_length(), st); 2951 st->print(BULLET"itable length %d (start addr: " INTPTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr(); 2952 if (itable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_itable(), itable_length(), st); 2953 st->print_cr(BULLET"---- static fields (%d words):", static_field_size()); 2954 FieldPrinter print_static_field(st); 2955 ((InstanceKlass*)this)->do_local_static_fields(&print_static_field); 2956 st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size()); 2957 FieldPrinter print_nonstatic_field(st); 2958 InstanceKlass* ik = const_cast<InstanceKlass*>(this); 2959 ik->do_nonstatic_fields(&print_nonstatic_field); 2960 2961 st->print(BULLET"non-static oop maps: "); 2962 OopMapBlock* map = start_of_nonstatic_oop_maps(); 2963 OopMapBlock* end_map = map + nonstatic_oop_map_count(); 2964 while (map < end_map) { 2965 st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1)); 2966 map++; 2967 } 2968 st->cr(); 2969 } 2970 2971 #endif //PRODUCT 2972 2973 void InstanceKlass::print_value_on(outputStream* st) const { 2974 assert(is_klass(), "must be klass"); 2975 if (Verbose || WizardMode) access_flags().print_on(st); 2976 name()->print_value_on(st); 2977 } 2978 2979 #ifndef PRODUCT 2980 2981 void FieldPrinter::do_field(fieldDescriptor* fd) { 2982 _st->print(BULLET); 2983 if (_obj == NULL) { 2984 fd->print_on(_st); 2985 _st->cr(); 2986 } else { 2987 fd->print_on_for(_st, _obj); 2988 _st->cr(); 2989 } 2990 } 2991 2992 2993 void InstanceKlass::oop_print_on(oop obj, outputStream* st) { 2994 Klass::oop_print_on(obj, st); 2995 2996 if (this == SystemDictionary::String_klass()) { 2997 typeArrayOop value = java_lang_String::value(obj); 2998 juint length = java_lang_String::length(obj); 2999 if (value != NULL && 3000 value->is_typeArray() && 3001 length <= (juint) value->length()) { 3002 st->print(BULLET"string: "); 3003 java_lang_String::print(obj, st); 3004 st->cr(); 3005 if (!WizardMode) return; // that is enough 3006 } 3007 } 3008 3009 st->print_cr(BULLET"---- fields (total size %d words):", oop_size(obj)); 3010 FieldPrinter print_field(st, obj); 3011 do_nonstatic_fields(&print_field); 3012 3013 if (this == SystemDictionary::Class_klass()) { 3014 st->print(BULLET"signature: "); 3015 java_lang_Class::print_signature(obj, st); 3016 st->cr(); 3017 Klass* mirrored_klass = java_lang_Class::as_Klass(obj); 3018 st->print(BULLET"fake entry for mirror: "); 3019 mirrored_klass->print_value_on_maybe_null(st); 3020 st->cr(); 3021 Klass* array_klass = java_lang_Class::array_klass_acquire(obj); 3022 st->print(BULLET"fake entry for array: "); 3023 array_klass->print_value_on_maybe_null(st); 3024 st->cr(); 3025 st->print_cr(BULLET"fake entry for oop_size: %d", java_lang_Class::oop_size(obj)); 3026 st->print_cr(BULLET"fake entry for static_oop_field_count: %d", java_lang_Class::static_oop_field_count(obj)); 3027 Klass* real_klass = java_lang_Class::as_Klass(obj); 3028 if (real_klass != NULL && real_klass->is_instance_klass()) { 3029 InstanceKlass::cast(real_klass)->do_local_static_fields(&print_field); 3030 } 3031 } else if (this == SystemDictionary::MethodType_klass()) { 3032 st->print(BULLET"signature: "); 3033 java_lang_invoke_MethodType::print_signature(obj, st); 3034 st->cr(); 3035 } 3036 } 3037 3038 #endif //PRODUCT 3039 3040 void InstanceKlass::oop_print_value_on(oop obj, outputStream* st) { 3041 st->print("a "); 3042 name()->print_value_on(st); 3043 obj->print_address_on(st); 3044 if (this == SystemDictionary::String_klass() 3045 && java_lang_String::value(obj) != NULL) { 3046 ResourceMark rm; 3047 int len = java_lang_String::length(obj); 3048 int plen = (len < 24 ? len : 12); 3049 char* str = java_lang_String::as_utf8_string(obj, 0, plen); 3050 st->print(" = \"%s\"", str); 3051 if (len > plen) 3052 st->print("...[%d]", len); 3053 } else if (this == SystemDictionary::Class_klass()) { 3054 Klass* k = java_lang_Class::as_Klass(obj); 3055 st->print(" = "); 3056 if (k != NULL) { 3057 k->print_value_on(st); 3058 } else { 3059 const char* tname = type2name(java_lang_Class::primitive_type(obj)); 3060 st->print("%s", tname ? tname : "type?"); 3061 } 3062 } else if (this == SystemDictionary::MethodType_klass()) { 3063 st->print(" = "); 3064 java_lang_invoke_MethodType::print_signature(obj, st); 3065 } else if (java_lang_boxing_object::is_instance(obj)) { 3066 st->print(" = "); 3067 java_lang_boxing_object::print(obj, st); 3068 } else if (this == SystemDictionary::LambdaForm_klass()) { 3069 oop vmentry = java_lang_invoke_LambdaForm::vmentry(obj); 3070 if (vmentry != NULL) { 3071 st->print(" => "); 3072 vmentry->print_value_on(st); 3073 } 3074 } else if (this == SystemDictionary::MemberName_klass()) { 3075 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(obj); 3076 if (vmtarget != NULL) { 3077 st->print(" = "); 3078 vmtarget->print_value_on(st); 3079 } else { 3080 java_lang_invoke_MemberName::clazz(obj)->print_value_on(st); 3081 st->print("."); 3082 java_lang_invoke_MemberName::name(obj)->print_value_on(st); 3083 } 3084 } 3085 } 3086 3087 const char* InstanceKlass::internal_name() const { 3088 return external_name(); 3089 } 3090 3091 void InstanceKlass::print_class_load_logging(ClassLoaderData* loader_data, 3092 const char* module_name, 3093 const ClassFileStream* cfs) const { 3094 if (!log_is_enabled(Info, class, load)) { 3095 return; 3096 } 3097 3098 ResourceMark rm; 3099 LogMessage(class, load) msg; 3100 stringStream info_stream; 3101 3102 // Name and class hierarchy info 3103 info_stream.print("%s", external_name()); 3104 3105 // Source 3106 if (cfs != NULL) { 3107 if (cfs->source() != NULL) { 3108 if (module_name != NULL) { 3109 if (ClassLoader::is_modules_image(cfs->source())) { 3110 info_stream.print(" source: jrt:/%s", module_name); 3111 } else { 3112 info_stream.print(" source: %s", cfs->source()); 3113 } 3114 } else { 3115 info_stream.print(" source: %s", cfs->source()); 3116 } 3117 } else if (loader_data == ClassLoaderData::the_null_class_loader_data()) { 3118 Thread* THREAD = Thread::current(); 3119 Klass* caller = 3120 THREAD->is_Java_thread() 3121 ? ((JavaThread*)THREAD)->security_get_caller_class(1) 3122 : NULL; 3123 // caller can be NULL, for example, during a JVMTI VM_Init hook 3124 if (caller != NULL) { 3125 info_stream.print(" source: instance of %s", caller->external_name()); 3126 } else { 3127 // source is unknown 3128 } 3129 } else { 3130 oop class_loader = loader_data->class_loader(); 3131 info_stream.print(" source: %s", class_loader->klass()->external_name()); 3132 } 3133 } else { 3134 info_stream.print(" source: shared objects file"); 3135 } 3136 3137 msg.info("%s", info_stream.as_string()); 3138 3139 if (log_is_enabled(Debug, class, load)) { 3140 stringStream debug_stream; 3141 3142 // Class hierarchy info 3143 debug_stream.print(" klass: " INTPTR_FORMAT " super: " INTPTR_FORMAT, 3144 p2i(this), p2i(superklass())); 3145 3146 // Interfaces 3147 if (local_interfaces() != NULL && local_interfaces()->length() > 0) { 3148 debug_stream.print(" interfaces:"); 3149 int length = local_interfaces()->length(); 3150 for (int i = 0; i < length; i++) { 3151 debug_stream.print(" " INTPTR_FORMAT, 3152 p2i(InstanceKlass::cast(local_interfaces()->at(i)))); 3153 } 3154 } 3155 3156 // Class loader 3157 debug_stream.print(" loader: ["); 3158 loader_data->print_value_on(&debug_stream); 3159 debug_stream.print("]"); 3160 3161 // Classfile checksum 3162 if (cfs) { 3163 debug_stream.print(" bytes: %d checksum: %08x", 3164 cfs->length(), 3165 ClassLoader::crc32(0, (const char*)cfs->buffer(), 3166 cfs->length())); 3167 } 3168 3169 msg.debug("%s", debug_stream.as_string()); 3170 } 3171 } 3172 3173 #if INCLUDE_SERVICES 3174 // Size Statistics 3175 void InstanceKlass::collect_statistics(KlassSizeStats *sz) const { 3176 Klass::collect_statistics(sz); 3177 3178 sz->_inst_size = wordSize * size_helper(); 3179 sz->_vtab_bytes = wordSize * vtable_length(); 3180 sz->_itab_bytes = wordSize * itable_length(); 3181 sz->_nonstatic_oopmap_bytes = wordSize * nonstatic_oop_map_size(); 3182 3183 int n = 0; 3184 n += (sz->_methods_array_bytes = sz->count_array(methods())); 3185 n += (sz->_method_ordering_bytes = sz->count_array(method_ordering())); 3186 n += (sz->_local_interfaces_bytes = sz->count_array(local_interfaces())); 3187 n += (sz->_transitive_interfaces_bytes = sz->count_array(transitive_interfaces())); 3188 n += (sz->_fields_bytes = sz->count_array(fields())); 3189 n += (sz->_inner_classes_bytes = sz->count_array(inner_classes())); 3190 sz->_ro_bytes += n; 3191 3192 const ConstantPool* cp = constants(); 3193 if (cp) { 3194 cp->collect_statistics(sz); 3195 } 3196 3197 const Annotations* anno = annotations(); 3198 if (anno) { 3199 anno->collect_statistics(sz); 3200 } 3201 3202 const Array<Method*>* methods_array = methods(); 3203 if (methods()) { 3204 for (int i = 0; i < methods_array->length(); i++) { 3205 Method* method = methods_array->at(i); 3206 if (method) { 3207 sz->_method_count ++; 3208 method->collect_statistics(sz); 3209 } 3210 } 3211 } 3212 } 3213 #endif // INCLUDE_SERVICES 3214 3215 // Verification 3216 3217 class VerifyFieldClosure: public OopClosure { 3218 protected: 3219 template <class T> void do_oop_work(T* p) { 3220 oop obj = RawAccess<>::oop_load(p); 3221 if (!oopDesc::is_oop_or_null(obj)) { 3222 tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p2i(p), p2i(obj)); 3223 Universe::print_on(tty); 3224 guarantee(false, "boom"); 3225 } 3226 } 3227 public: 3228 virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); } 3229 virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); } 3230 }; 3231 3232 void InstanceKlass::verify_on(outputStream* st) { 3233 #ifndef PRODUCT 3234 // Avoid redundant verifies, this really should be in product. 3235 if (_verify_count == Universe::verify_count()) return; 3236 _verify_count = Universe::verify_count(); 3237 #endif 3238 3239 // Verify Klass 3240 Klass::verify_on(st); 3241 3242 // Verify that klass is present in ClassLoaderData 3243 guarantee(class_loader_data()->contains_klass(this), 3244 "this class isn't found in class loader data"); 3245 3246 // Verify vtables 3247 if (is_linked()) { 3248 // $$$ This used to be done only for m/s collections. Doing it 3249 // always seemed a valid generalization. (DLD -- 6/00) 3250 vtable().verify(st); 3251 } 3252 3253 // Verify first subklass 3254 if (subklass() != NULL) { 3255 guarantee(subklass()->is_klass(), "should be klass"); 3256 } 3257 3258 // Verify siblings 3259 Klass* super = this->super(); 3260 Klass* sib = next_sibling(); 3261 if (sib != NULL) { 3262 if (sib == this) { 3263 fatal("subclass points to itself " PTR_FORMAT, p2i(sib)); 3264 } 3265 3266 guarantee(sib->is_klass(), "should be klass"); 3267 guarantee(sib->super() == super, "siblings should have same superklass"); 3268 } 3269 3270 // Verify implementor fields 3271 Klass* im = implementor(); 3272 if (im != NULL) { 3273 guarantee(is_interface(), "only interfaces should have implementor set"); 3274 guarantee(im->is_klass(), "should be klass"); 3275 guarantee(!im->is_interface() || im == this, 3276 "implementors cannot be interfaces"); 3277 } 3278 3279 // Verify local interfaces 3280 if (local_interfaces()) { 3281 Array<Klass*>* local_interfaces = this->local_interfaces(); 3282 for (int j = 0; j < local_interfaces->length(); j++) { 3283 Klass* e = local_interfaces->at(j); 3284 guarantee(e->is_klass() && e->is_interface(), "invalid local interface"); 3285 } 3286 } 3287 3288 // Verify transitive interfaces 3289 if (transitive_interfaces() != NULL) { 3290 Array<Klass*>* transitive_interfaces = this->transitive_interfaces(); 3291 for (int j = 0; j < transitive_interfaces->length(); j++) { 3292 Klass* e = transitive_interfaces->at(j); 3293 guarantee(e->is_klass() && e->is_interface(), "invalid transitive interface"); 3294 } 3295 } 3296 3297 // Verify methods 3298 if (methods() != NULL) { 3299 Array<Method*>* methods = this->methods(); 3300 for (int j = 0; j < methods->length(); j++) { 3301 guarantee(methods->at(j)->is_method(), "non-method in methods array"); 3302 } 3303 for (int j = 0; j < methods->length() - 1; j++) { 3304 Method* m1 = methods->at(j); 3305 Method* m2 = methods->at(j + 1); 3306 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly"); 3307 } 3308 } 3309 3310 // Verify method ordering 3311 if (method_ordering() != NULL) { 3312 Array<int>* method_ordering = this->method_ordering(); 3313 int length = method_ordering->length(); 3314 if (JvmtiExport::can_maintain_original_method_order() || 3315 ((UseSharedSpaces || DumpSharedSpaces) && length != 0)) { 3316 guarantee(length == methods()->length(), "invalid method ordering length"); 3317 jlong sum = 0; 3318 for (int j = 0; j < length; j++) { 3319 int original_index = method_ordering->at(j); 3320 guarantee(original_index >= 0, "invalid method ordering index"); 3321 guarantee(original_index < length, "invalid method ordering index"); 3322 sum += original_index; 3323 } 3324 // Verify sum of indices 0,1,...,length-1 3325 guarantee(sum == ((jlong)length*(length-1))/2, "invalid method ordering sum"); 3326 } else { 3327 guarantee(length == 0, "invalid method ordering length"); 3328 } 3329 } 3330 3331 // Verify default methods 3332 if (default_methods() != NULL) { 3333 Array<Method*>* methods = this->default_methods(); 3334 for (int j = 0; j < methods->length(); j++) { 3335 guarantee(methods->at(j)->is_method(), "non-method in methods array"); 3336 } 3337 for (int j = 0; j < methods->length() - 1; j++) { 3338 Method* m1 = methods->at(j); 3339 Method* m2 = methods->at(j + 1); 3340 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly"); 3341 } 3342 } 3343 3344 // Verify JNI static field identifiers 3345 if (jni_ids() != NULL) { 3346 jni_ids()->verify(this); 3347 } 3348 3349 // Verify other fields 3350 if (array_klasses() != NULL) { 3351 guarantee(array_klasses()->is_klass(), "should be klass"); 3352 } 3353 if (constants() != NULL) { 3354 guarantee(constants()->is_constantPool(), "should be constant pool"); 3355 } 3356 const Klass* host = host_klass(); 3357 if (host != NULL) { 3358 guarantee(host->is_klass(), "should be klass"); 3359 } 3360 } 3361 3362 void InstanceKlass::oop_verify_on(oop obj, outputStream* st) { 3363 Klass::oop_verify_on(obj, st); 3364 VerifyFieldClosure blk; 3365 obj->oop_iterate_no_header(&blk); 3366 } 3367 3368 3369 // JNIid class for jfieldIDs only 3370 // Note to reviewers: 3371 // These JNI functions are just moved over to column 1 and not changed 3372 // in the compressed oops workspace. 3373 JNIid::JNIid(Klass* holder, int offset, JNIid* next) { 3374 _holder = holder; 3375 _offset = offset; 3376 _next = next; 3377 debug_only(_is_static_field_id = false;) 3378 } 3379 3380 3381 JNIid* JNIid::find(int offset) { 3382 JNIid* current = this; 3383 while (current != NULL) { 3384 if (current->offset() == offset) return current; 3385 current = current->next(); 3386 } 3387 return NULL; 3388 } 3389 3390 void JNIid::deallocate(JNIid* current) { 3391 while (current != NULL) { 3392 JNIid* next = current->next(); 3393 delete current; 3394 current = next; 3395 } 3396 } 3397 3398 3399 void JNIid::verify(Klass* holder) { 3400 int first_field_offset = InstanceMirrorKlass::offset_of_static_fields(); 3401 int end_field_offset; 3402 end_field_offset = first_field_offset + (InstanceKlass::cast(holder)->static_field_size() * wordSize); 3403 3404 JNIid* current = this; 3405 while (current != NULL) { 3406 guarantee(current->holder() == holder, "Invalid klass in JNIid"); 3407 #ifdef ASSERT 3408 int o = current->offset(); 3409 if (current->is_static_field_id()) { 3410 guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid"); 3411 } 3412 #endif 3413 current = current->next(); 3414 } 3415 } 3416 3417 oop InstanceKlass::holder_phantom() const { 3418 return class_loader_data()->holder_phantom(); 3419 } 3420 3421 #ifdef ASSERT 3422 void InstanceKlass::set_init_state(ClassState state) { 3423 bool good_state = is_shared() ? (_init_state <= state) 3424 : (_init_state < state); 3425 assert(good_state || state == allocated, "illegal state transition"); 3426 _init_state = (u1)state; 3427 } 3428 #endif 3429 3430 #if INCLUDE_JVMTI 3431 3432 // RedefineClasses() support for previous versions 3433 3434 // Globally, there is at least one previous version of a class to walk 3435 // during class unloading, which is saved because old methods in the class 3436 // are still running. Otherwise the previous version list is cleaned up. 3437 bool InstanceKlass::_has_previous_versions = false; 3438 3439 // Returns true if there are previous versions of a class for class 3440 // unloading only. Also resets the flag to false. purge_previous_version 3441 // will set the flag to true if there are any left, i.e., if there's any 3442 // work to do for next time. This is to avoid the expensive code cache 3443 // walk in CLDG::do_unloading(). 3444 bool InstanceKlass::has_previous_versions_and_reset() { 3445 bool ret = _has_previous_versions; 3446 log_trace(redefine, class, iklass, purge)("Class unloading: has_previous_versions = %s", 3447 ret ? "true" : "false"); 3448 _has_previous_versions = false; 3449 return ret; 3450 } 3451 3452 // Purge previous versions before adding new previous versions of the class and 3453 // during class unloading. 3454 void InstanceKlass::purge_previous_version_list() { 3455 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); 3456 assert(has_been_redefined(), "Should only be called for main class"); 3457 3458 // Quick exit. 3459 if (previous_versions() == NULL) { 3460 return; 3461 } 3462 3463 // This klass has previous versions so see what we can cleanup 3464 // while it is safe to do so. 3465 3466 int deleted_count = 0; // leave debugging breadcrumbs 3467 int live_count = 0; 3468 ClassLoaderData* loader_data = class_loader_data(); 3469 assert(loader_data != NULL, "should never be null"); 3470 3471 ResourceMark rm; 3472 log_trace(redefine, class, iklass, purge)("%s: previous versions", external_name()); 3473 3474 // previous versions are linked together through the InstanceKlass 3475 InstanceKlass* pv_node = previous_versions(); 3476 InstanceKlass* last = this; 3477 int version = 0; 3478 3479 // check the previous versions list 3480 for (; pv_node != NULL; ) { 3481 3482 ConstantPool* pvcp = pv_node->constants(); 3483 assert(pvcp != NULL, "cp ref was unexpectedly cleared"); 3484 3485 if (!pvcp->on_stack()) { 3486 // If the constant pool isn't on stack, none of the methods 3487 // are executing. Unlink this previous_version. 3488 // The previous version InstanceKlass is on the ClassLoaderData deallocate list 3489 // so will be deallocated during the next phase of class unloading. 3490 log_trace(redefine, class, iklass, purge) 3491 ("previous version " INTPTR_FORMAT " is dead.", p2i(pv_node)); 3492 // For debugging purposes. 3493 pv_node->set_is_scratch_class(); 3494 // Unlink from previous version list. 3495 assert(pv_node->class_loader_data() == loader_data, "wrong loader_data"); 3496 InstanceKlass* next = pv_node->previous_versions(); 3497 pv_node->link_previous_versions(NULL); // point next to NULL 3498 last->link_previous_versions(next); 3499 // Add to the deallocate list after unlinking 3500 loader_data->add_to_deallocate_list(pv_node); 3501 pv_node = next; 3502 deleted_count++; 3503 version++; 3504 continue; 3505 } else { 3506 log_trace(redefine, class, iklass, purge)("previous version " INTPTR_FORMAT " is alive", p2i(pv_node)); 3507 assert(pvcp->pool_holder() != NULL, "Constant pool with no holder"); 3508 guarantee (!loader_data->is_unloading(), "unloaded classes can't be on the stack"); 3509 live_count++; 3510 // found a previous version for next time we do class unloading 3511 _has_previous_versions = true; 3512 } 3513 3514 // At least one method is live in this previous version. 3515 // Reset dead EMCP methods not to get breakpoints. 3516 // All methods are deallocated when all of the methods for this class are no 3517 // longer running. 3518 Array<Method*>* method_refs = pv_node->methods(); 3519 if (method_refs != NULL) { 3520 log_trace(redefine, class, iklass, purge)("previous methods length=%d", method_refs->length()); 3521 for (int j = 0; j < method_refs->length(); j++) { 3522 Method* method = method_refs->at(j); 3523 3524 if (!method->on_stack()) { 3525 // no breakpoints for non-running methods 3526 if (method->is_running_emcp()) { 3527 method->set_running_emcp(false); 3528 } 3529 } else { 3530 assert (method->is_obsolete() || method->is_running_emcp(), 3531 "emcp method cannot run after emcp bit is cleared"); 3532 log_trace(redefine, class, iklass, purge) 3533 ("purge: %s(%s): prev method @%d in version @%d is alive", 3534 method->name()->as_C_string(), method->signature()->as_C_string(), j, version); 3535 } 3536 } 3537 } 3538 // next previous version 3539 last = pv_node; 3540 pv_node = pv_node->previous_versions(); 3541 version++; 3542 } 3543 log_trace(redefine, class, iklass, purge) 3544 ("previous version stats: live=%d, deleted=%d", live_count, deleted_count); 3545 } 3546 3547 void InstanceKlass::mark_newly_obsolete_methods(Array<Method*>* old_methods, 3548 int emcp_method_count) { 3549 int obsolete_method_count = old_methods->length() - emcp_method_count; 3550 3551 if (emcp_method_count != 0 && obsolete_method_count != 0 && 3552 _previous_versions != NULL) { 3553 // We have a mix of obsolete and EMCP methods so we have to 3554 // clear out any matching EMCP method entries the hard way. 3555 int local_count = 0; 3556 for (int i = 0; i < old_methods->length(); i++) { 3557 Method* old_method = old_methods->at(i); 3558 if (old_method->is_obsolete()) { 3559 // only obsolete methods are interesting 3560 Symbol* m_name = old_method->name(); 3561 Symbol* m_signature = old_method->signature(); 3562 3563 // previous versions are linked together through the InstanceKlass 3564 int j = 0; 3565 for (InstanceKlass* prev_version = _previous_versions; 3566 prev_version != NULL; 3567 prev_version = prev_version->previous_versions(), j++) { 3568 3569 Array<Method*>* method_refs = prev_version->methods(); 3570 for (int k = 0; k < method_refs->length(); k++) { 3571 Method* method = method_refs->at(k); 3572 3573 if (!method->is_obsolete() && 3574 method->name() == m_name && 3575 method->signature() == m_signature) { 3576 // The current RedefineClasses() call has made all EMCP 3577 // versions of this method obsolete so mark it as obsolete 3578 log_trace(redefine, class, iklass, add) 3579 ("%s(%s): flush obsolete method @%d in version @%d", 3580 m_name->as_C_string(), m_signature->as_C_string(), k, j); 3581 3582 method->set_is_obsolete(); 3583 break; 3584 } 3585 } 3586 3587 // The previous loop may not find a matching EMCP method, but 3588 // that doesn't mean that we can optimize and not go any 3589 // further back in the PreviousVersion generations. The EMCP 3590 // method for this generation could have already been made obsolete, 3591 // but there still may be an older EMCP method that has not 3592 // been made obsolete. 3593 } 3594 3595 if (++local_count >= obsolete_method_count) { 3596 // no more obsolete methods so bail out now 3597 break; 3598 } 3599 } 3600 } 3601 } 3602 } 3603 3604 // Save the scratch_class as the previous version if any of the methods are running. 3605 // The previous_versions are used to set breakpoints in EMCP methods and they are 3606 // also used to clean MethodData links to redefined methods that are no longer running. 3607 void InstanceKlass::add_previous_version(InstanceKlass* scratch_class, 3608 int emcp_method_count) { 3609 assert(Thread::current()->is_VM_thread(), 3610 "only VMThread can add previous versions"); 3611 3612 ResourceMark rm; 3613 log_trace(redefine, class, iklass, add) 3614 ("adding previous version ref for %s, EMCP_cnt=%d", scratch_class->external_name(), emcp_method_count); 3615 3616 // Clean out old previous versions for this class 3617 purge_previous_version_list(); 3618 3619 // Mark newly obsolete methods in remaining previous versions. An EMCP method from 3620 // a previous redefinition may be made obsolete by this redefinition. 3621 Array<Method*>* old_methods = scratch_class->methods(); 3622 mark_newly_obsolete_methods(old_methods, emcp_method_count); 3623 3624 // If the constant pool for this previous version of the class 3625 // is not marked as being on the stack, then none of the methods 3626 // in this previous version of the class are on the stack so 3627 // we don't need to add this as a previous version. 3628 ConstantPool* cp_ref = scratch_class->constants(); 3629 if (!cp_ref->on_stack()) { 3630 log_trace(redefine, class, iklass, add)("scratch class not added; no methods are running"); 3631 // For debugging purposes. 3632 scratch_class->set_is_scratch_class(); 3633 scratch_class->class_loader_data()->add_to_deallocate_list(scratch_class); 3634 return; 3635 } 3636 3637 if (emcp_method_count != 0) { 3638 // At least one method is still running, check for EMCP methods 3639 for (int i = 0; i < old_methods->length(); i++) { 3640 Method* old_method = old_methods->at(i); 3641 if (!old_method->is_obsolete() && old_method->on_stack()) { 3642 // if EMCP method (not obsolete) is on the stack, mark as EMCP so that 3643 // we can add breakpoints for it. 3644 3645 // We set the method->on_stack bit during safepoints for class redefinition 3646 // and use this bit to set the is_running_emcp bit. 3647 // After the safepoint, the on_stack bit is cleared and the running emcp 3648 // method may exit. If so, we would set a breakpoint in a method that 3649 // is never reached, but this won't be noticeable to the programmer. 3650 old_method->set_running_emcp(true); 3651 log_trace(redefine, class, iklass, add) 3652 ("EMCP method %s is on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method)); 3653 } else if (!old_method->is_obsolete()) { 3654 log_trace(redefine, class, iklass, add) 3655 ("EMCP method %s is NOT on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method)); 3656 } 3657 } 3658 } 3659 3660 // Add previous version if any methods are still running. 3661 // Set has_previous_version flag for processing during class unloading. 3662 _has_previous_versions = true; 3663 log_trace(redefine, class, iklass, add) ("scratch class added; one of its methods is on_stack."); 3664 assert(scratch_class->previous_versions() == NULL, "shouldn't have a previous version"); 3665 scratch_class->link_previous_versions(previous_versions()); 3666 link_previous_versions(scratch_class); 3667 } // end add_previous_version() 3668 3669 #endif // INCLUDE_JVMTI 3670 3671 Method* InstanceKlass::method_with_idnum(int idnum) { 3672 Method* m = NULL; 3673 if (idnum < methods()->length()) { 3674 m = methods()->at(idnum); 3675 } 3676 if (m == NULL || m->method_idnum() != idnum) { 3677 for (int index = 0; index < methods()->length(); ++index) { 3678 m = methods()->at(index); 3679 if (m->method_idnum() == idnum) { 3680 return m; 3681 } 3682 } 3683 // None found, return null for the caller to handle. 3684 return NULL; 3685 } 3686 return m; 3687 } 3688 3689 3690 Method* InstanceKlass::method_with_orig_idnum(int idnum) { 3691 if (idnum >= methods()->length()) { 3692 return NULL; 3693 } 3694 Method* m = methods()->at(idnum); 3695 if (m != NULL && m->orig_method_idnum() == idnum) { 3696 return m; 3697 } 3698 // Obsolete method idnum does not match the original idnum 3699 for (int index = 0; index < methods()->length(); ++index) { 3700 m = methods()->at(index); 3701 if (m->orig_method_idnum() == idnum) { 3702 return m; 3703 } 3704 } 3705 // None found, return null for the caller to handle. 3706 return NULL; 3707 } 3708 3709 3710 Method* InstanceKlass::method_with_orig_idnum(int idnum, int version) { 3711 InstanceKlass* holder = get_klass_version(version); 3712 if (holder == NULL) { 3713 return NULL; // The version of klass is gone, no method is found 3714 } 3715 Method* method = holder->method_with_orig_idnum(idnum); 3716 return method; 3717 } 3718 3719 #if INCLUDE_JVMTI 3720 JvmtiCachedClassFileData* InstanceKlass::get_cached_class_file() { 3721 if (MetaspaceShared::is_in_shared_metaspace(_cached_class_file)) { 3722 // Ignore the archived class stream data 3723 return NULL; 3724 } else { 3725 return _cached_class_file; 3726 } 3727 } 3728 3729 jint InstanceKlass::get_cached_class_file_len() { 3730 return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file); 3731 } 3732 3733 unsigned char * InstanceKlass::get_cached_class_file_bytes() { 3734 return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file); 3735 } 3736 3737 #if INCLUDE_CDS 3738 JvmtiCachedClassFileData* InstanceKlass::get_archived_class_data() { 3739 if (DumpSharedSpaces) { 3740 return _cached_class_file; 3741 } else { 3742 assert(this->is_shared(), "class should be shared"); 3743 if (MetaspaceShared::is_in_shared_metaspace(_cached_class_file)) { 3744 return _cached_class_file; 3745 } else { 3746 return NULL; 3747 } 3748 } 3749 } 3750 #endif 3751 #endif