1 /* 2 * Copyright (c) 2012, 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 "classfile/classListParser.hpp" 28 #include "classfile/classLoaderExt.hpp" 29 #include "classfile/dictionary.hpp" 30 #include "classfile/loaderConstraints.hpp" 31 #include "classfile/placeholders.hpp" 32 #include "classfile/symbolTable.hpp" 33 #include "classfile/stringTable.hpp" 34 #include "classfile/systemDictionary.hpp" 35 #include "classfile/systemDictionaryShared.hpp" 36 #include "code/codeCache.hpp" 37 #include "interpreter/bytecodeStream.hpp" 38 #include "interpreter/bytecodes.hpp" 39 #include "logging/log.hpp" 40 #include "logging/logMessage.hpp" 41 #include "memory/filemap.hpp" 42 #include "memory/heapShared.hpp" 43 #include "memory/metaspace.hpp" 44 #include "memory/metaspaceClosure.hpp" 45 #include "memory/metaspaceShared.hpp" 46 #include "memory/resourceArea.hpp" 47 #include "oops/compressedOops.inline.hpp" 48 #include "oops/instanceClassLoaderKlass.hpp" 49 #include "oops/instanceMirrorKlass.hpp" 50 #include "oops/instanceRefKlass.hpp" 51 #include "oops/objArrayKlass.hpp" 52 #include "oops/objArrayOop.hpp" 53 #include "oops/oop.inline.hpp" 54 #include "oops/typeArrayKlass.hpp" 55 #include "prims/jvmtiRedefineClasses.hpp" 56 #include "runtime/handles.inline.hpp" 57 #include "runtime/os.hpp" 58 #include "runtime/safepointVerifiers.hpp" 59 #include "runtime/signature.hpp" 60 #include "runtime/timerTrace.hpp" 61 #include "runtime/vmThread.hpp" 62 #include "runtime/vm_operations.hpp" 63 #include "utilities/align.hpp" 64 #include "utilities/defaultStream.hpp" 65 #include "utilities/hashtable.inline.hpp" 66 #if INCLUDE_G1GC 67 #include "gc/g1/g1Allocator.inline.hpp" 68 #include "gc/g1/g1CollectedHeap.hpp" 69 #endif 70 71 ReservedSpace MetaspaceShared::_shared_rs; 72 VirtualSpace MetaspaceShared::_shared_vs; 73 MetaspaceSharedStats MetaspaceShared::_stats; 74 bool MetaspaceShared::_has_error_classes; 75 bool MetaspaceShared::_archive_loading_failed = false; 76 bool MetaspaceShared::_remapped_readwrite = false; 77 bool MetaspaceShared::_open_archive_heap_region_mapped = false; 78 address MetaspaceShared::_cds_i2i_entry_code_buffers = NULL; 79 size_t MetaspaceShared::_cds_i2i_entry_code_buffers_size = 0; 80 size_t MetaspaceShared::_core_spaces_size = 0; 81 82 // The CDS archive is divided into the following regions: 83 // mc - misc code (the method entry trampolines) 84 // rw - read-write metadata 85 // ro - read-only metadata and read-only tables 86 // md - misc data (the c++ vtables) 87 // od - optional data (original class files) 88 // 89 // s0 - shared strings(closed archive heap space) #0 90 // s1 - shared strings(closed archive heap space) #1 (may be empty) 91 // oa0 - open archive heap space #0 92 // oa1 - open archive heap space #1 (may be empty) 93 // 94 // The mc, rw, ro, md and od regions are linearly allocated, starting from 95 // SharedBaseAddress, in the order of mc->rw->ro->md->od. The size of these 5 regions 96 // are page-aligned, and there's no gap between any consecutive regions. 97 // 98 // These 5 regions are populated in the following steps: 99 // [1] All classes are loaded in MetaspaceShared::preload_classes(). All metadata are 100 // temporarily allocated outside of the shared regions. Only the method entry 101 // trampolines are written into the mc region. 102 // [2] ArchiveCompactor copies RW metadata into the rw region. 103 // [3] ArchiveCompactor copies RO metadata into the ro region. 104 // [4] SymbolTable, StringTable, SystemDictionary, and a few other read-only data 105 // are copied into the ro region as read-only tables. 106 // [5] C++ vtables are copied into the md region. 107 // [6] Original class files are copied into the od region. 108 // 109 // The s0/s1 and oa0/oa1 regions are populated inside MetaspaceShared::dump_java_heap_objects. 110 // Their layout is independent of the other 5 regions. 111 112 class DumpRegion { 113 private: 114 const char* _name; 115 char* _base; 116 char* _top; 117 char* _end; 118 bool _is_packed; 119 120 char* expand_top_to(char* newtop) { 121 assert(is_allocatable(), "must be initialized and not packed"); 122 assert(newtop >= _top, "must not grow backwards"); 123 if (newtop > _end) { 124 MetaspaceShared::report_out_of_space(_name, newtop - _top); 125 ShouldNotReachHere(); 126 } 127 MetaspaceShared::commit_shared_space_to(newtop); 128 _top = newtop; 129 return _top; 130 } 131 132 public: 133 DumpRegion(const char* name) : _name(name), _base(NULL), _top(NULL), _end(NULL), _is_packed(false) {} 134 135 char* allocate(size_t num_bytes, size_t alignment=BytesPerWord) { 136 char* p = (char*)align_up(_top, alignment); 137 char* newtop = p + align_up(num_bytes, alignment); 138 expand_top_to(newtop); 139 memset(p, 0, newtop - p); 140 return p; 141 } 142 143 void append_intptr_t(intptr_t n) { 144 assert(is_aligned(_top, sizeof(intptr_t)), "bad alignment"); 145 intptr_t *p = (intptr_t*)_top; 146 char* newtop = _top + sizeof(intptr_t); 147 expand_top_to(newtop); 148 *p = n; 149 } 150 151 char* base() const { return _base; } 152 char* top() const { return _top; } 153 char* end() const { return _end; } 154 size_t reserved() const { return _end - _base; } 155 size_t used() const { return _top - _base; } 156 bool is_packed() const { return _is_packed; } 157 bool is_allocatable() const { 158 return !is_packed() && _base != NULL; 159 } 160 161 void print(size_t total_bytes) const { 162 tty->print_cr("%-3s space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used] at " INTPTR_FORMAT, 163 _name, used(), percent_of(used(), total_bytes), reserved(), percent_of(used(), reserved()), p2i(_base)); 164 } 165 void print_out_of_space_msg(const char* failing_region, size_t needed_bytes) { 166 tty->print("[%-8s] " PTR_FORMAT " - " PTR_FORMAT " capacity =%9d, allocated =%9d", 167 _name, p2i(_base), p2i(_top), int(_end - _base), int(_top - _base)); 168 if (strcmp(_name, failing_region) == 0) { 169 tty->print_cr(" required = %d", int(needed_bytes)); 170 } else { 171 tty->cr(); 172 } 173 } 174 175 void init(const ReservedSpace* rs) { 176 _base = _top = rs->base(); 177 _end = rs->end(); 178 } 179 void init(char* b, char* t, char* e) { 180 _base = b; 181 _top = t; 182 _end = e; 183 } 184 185 void pack(DumpRegion* next = NULL) { 186 assert(!is_packed(), "sanity"); 187 _end = (char*)align_up(_top, Metaspace::reserve_alignment()); 188 _is_packed = true; 189 if (next != NULL) { 190 next->_base = next->_top = this->_end; 191 next->_end = MetaspaceShared::shared_rs()->end(); 192 } 193 } 194 bool contains(char* p) { 195 return base() <= p && p < top(); 196 } 197 }; 198 199 200 DumpRegion _mc_region("mc"), _ro_region("ro"), _rw_region("rw"), _md_region("md"), _od_region("od"); 201 size_t _total_string_region_size = 0, _total_open_archive_region_size = 0; 202 203 char* MetaspaceShared::misc_code_space_alloc(size_t num_bytes) { 204 return _mc_region.allocate(num_bytes); 205 } 206 207 char* MetaspaceShared::read_only_space_alloc(size_t num_bytes) { 208 return _ro_region.allocate(num_bytes); 209 } 210 211 char* MetaspaceShared::read_only_space_top() { 212 return _ro_region.top(); 213 } 214 215 void MetaspaceShared::initialize_runtime_shared_and_meta_spaces() { 216 assert(UseSharedSpaces, "Must be called when UseSharedSpaces is enabled"); 217 218 // If using shared space, open the file that contains the shared space 219 // and map in the memory before initializing the rest of metaspace (so 220 // the addresses don't conflict) 221 address cds_address = NULL; 222 FileMapInfo* mapinfo = new FileMapInfo(); 223 224 // Open the shared archive file, read and validate the header. If 225 // initialization fails, shared spaces [UseSharedSpaces] are 226 // disabled and the file is closed. 227 // Map in spaces now also 228 if (mapinfo->initialize() && map_shared_spaces(mapinfo)) { 229 size_t cds_total = core_spaces_size(); 230 cds_address = (address)mapinfo->header()->region_addr(0); 231 #ifdef _LP64 232 if (Metaspace::using_class_space()) { 233 char* cds_end = (char*)(cds_address + cds_total); 234 cds_end = (char *)align_up(cds_end, Metaspace::reserve_alignment()); 235 // If UseCompressedClassPointers is set then allocate the metaspace area 236 // above the heap and above the CDS area (if it exists). 237 Metaspace::allocate_metaspace_compressed_klass_ptrs(cds_end, cds_address); 238 // map_heap_regions() compares the current narrow oop and klass encodings 239 // with the archived ones, so it must be done after all encodings are determined. 240 mapinfo->map_heap_regions(); 241 } 242 Universe::set_narrow_klass_range(CompressedClassSpaceSize); 243 #endif // _LP64 244 } else { 245 assert(!mapinfo->is_open() && !UseSharedSpaces, 246 "archive file not closed or shared spaces not disabled."); 247 } 248 } 249 250 void MetaspaceShared::initialize_dumptime_shared_and_meta_spaces() { 251 assert(DumpSharedSpaces, "should be called for dump time only"); 252 const size_t reserve_alignment = Metaspace::reserve_alignment(); 253 bool large_pages = false; // No large pages when dumping the CDS archive. 254 char* shared_base = (char*)align_up((char*)SharedBaseAddress, reserve_alignment); 255 256 #ifdef _LP64 257 // On 64-bit VM, the heap and class space layout will be the same as if 258 // you're running in -Xshare:on mode: 259 // 260 // +-- SharedBaseAddress (default = 0x800000000) 261 // v 262 // +-..---------+---------+ ... +----+----+----+----+----+---------------+ 263 // | Heap | Archive | | MC | RW | RO | MD | OD | class space | 264 // +-..---------+---------+ ... +----+----+----+----+----+---------------+ 265 // |<-- MaxHeapSize -->| |<-- UnscaledClassSpaceMax = 4GB ------->| 266 // 267 const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1); 268 const size_t cds_total = align_down(UnscaledClassSpaceMax, reserve_alignment); 269 #else 270 // We don't support archives larger than 256MB on 32-bit due to limited virtual address space. 271 size_t cds_total = align_down(256*M, reserve_alignment); 272 #endif 273 274 // First try to reserve the space at the specified SharedBaseAddress. 275 _shared_rs = ReservedSpace(cds_total, reserve_alignment, large_pages, shared_base); 276 if (_shared_rs.is_reserved()) { 277 assert(shared_base == 0 || _shared_rs.base() == shared_base, "should match"); 278 } else { 279 // Get a mmap region anywhere if the SharedBaseAddress fails. 280 _shared_rs = ReservedSpace(cds_total, reserve_alignment, large_pages); 281 } 282 if (!_shared_rs.is_reserved()) { 283 vm_exit_during_initialization("Unable to reserve memory for shared space", 284 err_msg(SIZE_FORMAT " bytes.", cds_total)); 285 } 286 287 #ifdef _LP64 288 // During dump time, we allocate 4GB (UnscaledClassSpaceMax) of space and split it up: 289 // + The upper 1 GB is used as the "temporary compressed class space" -- preload_classes() 290 // will store Klasses into this space. 291 // + The lower 3 GB is used for the archive -- when preload_classes() is done, 292 // ArchiveCompactor will copy the class metadata into this space, first the RW parts, 293 // then the RO parts. 294 295 assert(UseCompressedOops && UseCompressedClassPointers, 296 "UseCompressedOops and UseCompressedClassPointers must be set"); 297 298 size_t max_archive_size = align_down(cds_total * 3 / 4, reserve_alignment); 299 ReservedSpace tmp_class_space = _shared_rs.last_part(max_archive_size); 300 CompressedClassSpaceSize = align_down(tmp_class_space.size(), reserve_alignment); 301 _shared_rs = _shared_rs.first_part(max_archive_size); 302 303 // Set up compress class pointers. 304 Universe::set_narrow_klass_base((address)_shared_rs.base()); 305 // Set narrow_klass_shift to be LogKlassAlignmentInBytes. This is consistent 306 // with AOT. 307 Universe::set_narrow_klass_shift(LogKlassAlignmentInBytes); 308 // Set the range of klass addresses to 4GB. 309 Universe::set_narrow_klass_range(cds_total); 310 311 Metaspace::initialize_class_space(tmp_class_space); 312 tty->print_cr("narrow_klass_base = " PTR_FORMAT ", narrow_klass_shift = %d", 313 p2i(Universe::narrow_klass_base()), Universe::narrow_klass_shift()); 314 315 tty->print_cr("Allocated temporary class space: " SIZE_FORMAT " bytes at " PTR_FORMAT, 316 CompressedClassSpaceSize, p2i(tmp_class_space.base())); 317 #endif 318 319 // Start with 0 committed bytes. The memory will be committed as needed by 320 // MetaspaceShared::commit_shared_space_to(). 321 if (!_shared_vs.initialize(_shared_rs, 0)) { 322 vm_exit_during_initialization("Unable to allocate memory for shared space"); 323 } 324 325 _mc_region.init(&_shared_rs); 326 tty->print_cr("Allocated shared space: " SIZE_FORMAT " bytes at " PTR_FORMAT, 327 _shared_rs.size(), p2i(_shared_rs.base())); 328 } 329 330 // Called by universe_post_init() 331 void MetaspaceShared::post_initialize(TRAPS) { 332 if (UseSharedSpaces) { 333 int size = FileMapInfo::get_number_of_shared_paths(); 334 if (size > 0) { 335 SystemDictionaryShared::allocate_shared_data_arrays(size, THREAD); 336 FileMapInfo::FileMapHeader* header = FileMapInfo::current_info()->header(); 337 ClassLoaderExt::init_paths_start_index(header->_app_class_paths_start_index); 338 ClassLoaderExt::init_app_module_paths_start_index(header->_app_module_paths_start_index); 339 } 340 } 341 342 if (DumpSharedSpaces) { 343 if (SharedArchiveConfigFile) { 344 read_extra_data(SharedArchiveConfigFile, THREAD); 345 } 346 } 347 } 348 349 void MetaspaceShared::read_extra_data(const char* filename, TRAPS) { 350 HashtableTextDump reader(filename); 351 reader.check_version("VERSION: 1.0"); 352 353 while (reader.remain() > 0) { 354 int utf8_length; 355 int prefix_type = reader.scan_prefix(&utf8_length); 356 ResourceMark rm(THREAD); 357 char* utf8_buffer = NEW_RESOURCE_ARRAY(char, utf8_length); 358 reader.get_utf8(utf8_buffer, utf8_length); 359 360 if (prefix_type == HashtableTextDump::SymbolPrefix) { 361 SymbolTable::new_symbol(utf8_buffer, utf8_length, THREAD); 362 } else{ 363 assert(prefix_type == HashtableTextDump::StringPrefix, "Sanity"); 364 utf8_buffer[utf8_length] = '\0'; 365 oop s = StringTable::intern(utf8_buffer, THREAD); 366 } 367 } 368 } 369 370 void MetaspaceShared::commit_shared_space_to(char* newtop) { 371 assert(DumpSharedSpaces, "dump-time only"); 372 char* base = _shared_rs.base(); 373 size_t need_committed_size = newtop - base; 374 size_t has_committed_size = _shared_vs.committed_size(); 375 if (need_committed_size < has_committed_size) { 376 return; 377 } 378 379 size_t min_bytes = need_committed_size - has_committed_size; 380 size_t preferred_bytes = 1 * M; 381 size_t uncommitted = _shared_vs.reserved_size() - has_committed_size; 382 383 size_t commit = MAX2(min_bytes, preferred_bytes); 384 assert(commit <= uncommitted, "sanity"); 385 386 bool result = _shared_vs.expand_by(commit, false); 387 if (!result) { 388 vm_exit_during_initialization(err_msg("Failed to expand shared space to " SIZE_FORMAT " bytes", 389 need_committed_size)); 390 } 391 392 log_info(cds)("Expanding shared spaces by " SIZE_FORMAT_W(7) " bytes [total " SIZE_FORMAT_W(9) " bytes ending at %p]", 393 commit, _shared_vs.actual_committed_size(), _shared_vs.high()); 394 } 395 396 // Read/write a data stream for restoring/preserving metadata pointers and 397 // miscellaneous data from/to the shared archive file. 398 399 void MetaspaceShared::serialize(SerializeClosure* soc) { 400 int tag = 0; 401 soc->do_tag(--tag); 402 403 // Verify the sizes of various metadata in the system. 404 soc->do_tag(sizeof(Method)); 405 soc->do_tag(sizeof(ConstMethod)); 406 soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE)); 407 soc->do_tag(sizeof(ConstantPool)); 408 soc->do_tag(sizeof(ConstantPoolCache)); 409 soc->do_tag(objArrayOopDesc::base_offset_in_bytes()); 410 soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE)); 411 soc->do_tag(sizeof(Symbol)); 412 413 // Dump/restore miscellaneous metadata. 414 Universe::serialize(soc, true); 415 soc->do_tag(--tag); 416 417 // Dump/restore references to commonly used names and signatures. 418 vmSymbols::serialize(soc); 419 soc->do_tag(--tag); 420 421 // Dump/restore the symbol and string tables 422 SymbolTable::serialize(soc); 423 StringTable::serialize(soc); 424 soc->do_tag(--tag); 425 426 serialize_well_known_classes(soc); 427 soc->do_tag(--tag); 428 429 soc->do_tag(666); 430 } 431 432 void MetaspaceShared::serialize_well_known_classes(SerializeClosure* soc) { 433 java_lang_Class::serialize(soc); 434 java_lang_String::serialize(soc); 435 java_lang_System::serialize(soc); 436 java_lang_ClassLoader::serialize(soc); 437 java_lang_Throwable::serialize(soc); 438 java_lang_Thread::serialize(soc); 439 java_lang_ThreadGroup::serialize(soc); 440 java_lang_AssertionStatusDirectives::serialize(soc); 441 java_lang_ref_SoftReference::serialize(soc); 442 java_lang_invoke_MethodHandle::serialize(soc); 443 java_lang_invoke_DirectMethodHandle::serialize(soc); 444 java_lang_invoke_MemberName::serialize(soc); 445 java_lang_invoke_ResolvedMethodName::serialize(soc); 446 java_lang_invoke_LambdaForm::serialize(soc); 447 java_lang_invoke_MethodType::serialize(soc); 448 java_lang_invoke_CallSite::serialize(soc); 449 java_lang_invoke_MethodHandleNatives_CallSiteContext::serialize(soc); 450 java_security_AccessControlContext::serialize(soc); 451 java_lang_reflect_AccessibleObject::serialize(soc); 452 java_lang_reflect_Method::serialize(soc); 453 java_lang_reflect_Constructor::serialize(soc); 454 java_lang_reflect_Field::serialize(soc); 455 java_nio_Buffer::serialize(soc); 456 reflect_ConstantPool::serialize(soc); 457 reflect_UnsafeStaticFieldAccessorImpl::serialize(soc); 458 java_lang_reflect_Parameter::serialize(soc); 459 java_lang_Module::serialize(soc); 460 java_lang_StackTraceElement::serialize(soc); 461 java_lang_StackFrameInfo::serialize(soc); 462 java_lang_LiveStackFrameInfo::serialize(soc); 463 java_util_concurrent_locks_AbstractOwnableSynchronizer::serialize(soc); 464 jdk_internal_module_ArchivedModuleGraph::serialize(soc); 465 } 466 467 address MetaspaceShared::cds_i2i_entry_code_buffers(size_t total_size) { 468 if (DumpSharedSpaces) { 469 if (_cds_i2i_entry_code_buffers == NULL) { 470 _cds_i2i_entry_code_buffers = (address)misc_code_space_alloc(total_size); 471 _cds_i2i_entry_code_buffers_size = total_size; 472 } 473 } else if (UseSharedSpaces) { 474 assert(_cds_i2i_entry_code_buffers != NULL, "must already been initialized"); 475 } else { 476 return NULL; 477 } 478 479 assert(_cds_i2i_entry_code_buffers_size == total_size, "must not change"); 480 return _cds_i2i_entry_code_buffers; 481 } 482 483 // CDS code for dumping shared archive. 484 485 // Global object for holding classes that have been loaded. Since this 486 // is run at a safepoint just before exit, this is the entire set of classes. 487 static GrowableArray<Klass*>* _global_klass_objects; 488 489 static void collect_array_classes(Klass* k) { 490 _global_klass_objects->append_if_missing(k); 491 if (k->is_array_klass()) { 492 // Add in the array classes too 493 ArrayKlass* ak = ArrayKlass::cast(k); 494 Klass* h = ak->higher_dimension(); 495 if (h != NULL) { 496 h->array_klasses_do(collect_array_classes); 497 } 498 } 499 } 500 501 class CollectClassesClosure : public KlassClosure { 502 void do_klass(Klass* k) { 503 if (!(k->is_instance_klass() && InstanceKlass::cast(k)->is_in_error_state())) { 504 if (k->is_instance_klass() && InstanceKlass::cast(k)->signers() != NULL) { 505 // Mark any class with signers and don't add to the _global_klass_objects 506 k->set_has_signer_and_not_archived(); 507 } else { 508 _global_klass_objects->append_if_missing(k); 509 } 510 } 511 if (k->is_array_klass()) { 512 // Add in the array classes too 513 ArrayKlass* ak = ArrayKlass::cast(k); 514 Klass* h = ak->higher_dimension(); 515 if (h != NULL) { 516 h->array_klasses_do(collect_array_classes); 517 } 518 } 519 } 520 }; 521 522 static void remove_unshareable_in_classes() { 523 for (int i = 0; i < _global_klass_objects->length(); i++) { 524 Klass* k = _global_klass_objects->at(i); 525 if (!k->is_objArray_klass()) { 526 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info 527 // on their array classes. 528 assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be"); 529 k->remove_unshareable_info(); 530 } 531 } 532 } 533 534 static void remove_java_mirror_in_classes() { 535 for (int i = 0; i < _global_klass_objects->length(); i++) { 536 Klass* k = _global_klass_objects->at(i); 537 if (!k->is_objArray_klass()) { 538 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info 539 // on their array classes. 540 assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be"); 541 k->remove_java_mirror(); 542 } 543 } 544 } 545 546 static void clear_basic_type_mirrors() { 547 assert(!MetaspaceShared::is_heap_object_archiving_allowed(), "Sanity"); 548 Universe::set_int_mirror(NULL); 549 Universe::set_float_mirror(NULL); 550 Universe::set_double_mirror(NULL); 551 Universe::set_byte_mirror(NULL); 552 Universe::set_bool_mirror(NULL); 553 Universe::set_char_mirror(NULL); 554 Universe::set_long_mirror(NULL); 555 Universe::set_short_mirror(NULL); 556 Universe::set_void_mirror(NULL); 557 } 558 559 static void rewrite_nofast_bytecode(Method* method) { 560 BytecodeStream bcs(method); 561 while (!bcs.is_last_bytecode()) { 562 Bytecodes::Code opcode = bcs.next(); 563 switch (opcode) { 564 case Bytecodes::_getfield: *bcs.bcp() = Bytecodes::_nofast_getfield; break; 565 case Bytecodes::_putfield: *bcs.bcp() = Bytecodes::_nofast_putfield; break; 566 case Bytecodes::_aload_0: *bcs.bcp() = Bytecodes::_nofast_aload_0; break; 567 case Bytecodes::_iload: { 568 if (!bcs.is_wide()) { 569 *bcs.bcp() = Bytecodes::_nofast_iload; 570 } 571 break; 572 } 573 default: break; 574 } 575 } 576 } 577 578 // Walk all methods in the class list to ensure that they won't be modified at 579 // run time. This includes: 580 // [1] Rewrite all bytecodes as needed, so that the ConstMethod* will not be modified 581 // at run time by RewriteBytecodes/RewriteFrequentPairs 582 // [2] Assign a fingerprint, so one doesn't need to be assigned at run-time. 583 static void rewrite_nofast_bytecodes_and_calculate_fingerprints() { 584 for (int i = 0; i < _global_klass_objects->length(); i++) { 585 Klass* k = _global_klass_objects->at(i); 586 if (k->is_instance_klass()) { 587 InstanceKlass* ik = InstanceKlass::cast(k); 588 for (int i = 0; i < ik->methods()->length(); i++) { 589 Method* m = ik->methods()->at(i); 590 rewrite_nofast_bytecode(m); 591 Fingerprinter fp(m); 592 // The side effect of this call sets method's fingerprint field. 593 fp.fingerprint(); 594 } 595 } 596 } 597 } 598 599 static void relocate_cached_class_file() { 600 for (int i = 0; i < _global_klass_objects->length(); i++) { 601 Klass* k = _global_klass_objects->at(i); 602 if (k->is_instance_klass()) { 603 InstanceKlass* ik = InstanceKlass::cast(k); 604 JvmtiCachedClassFileData* p = ik->get_archived_class_data(); 605 if (p != NULL) { 606 int size = offset_of(JvmtiCachedClassFileData, data) + p->length; 607 JvmtiCachedClassFileData* q = (JvmtiCachedClassFileData*)_od_region.allocate(size); 608 q->length = p->length; 609 memcpy(q->data, p->data, p->length); 610 ik->set_archived_class_data(q); 611 } 612 } 613 } 614 } 615 616 NOT_PRODUCT( 617 static void assert_not_anonymous_class(InstanceKlass* k) { 618 assert(!(k->is_anonymous()), "cannot archive anonymous classes"); 619 } 620 621 // Anonymous classes are not stored inside any dictionaries. They are created by 622 // SystemDictionary::parse_stream() with a non-null host_klass. 623 static void assert_no_anonymoys_classes_in_dictionaries() { 624 ClassLoaderDataGraph::dictionary_classes_do(assert_not_anonymous_class); 625 }) 626 627 // Objects of the Metadata types (such as Klass and ConstantPool) have C++ vtables. 628 // (In GCC this is the field <Type>::_vptr, i.e., first word in the object.) 629 // 630 // Addresses of the vtables and the methods may be different across JVM runs, 631 // if libjvm.so is dynamically loaded at a different base address. 632 // 633 // To ensure that the Metadata objects in the CDS archive always have the correct vtable: 634 // 635 // + at dump time: we redirect the _vptr to point to our own vtables inside 636 // the CDS image 637 // + at run time: we clone the actual contents of the vtables from libjvm.so 638 // into our own tables. 639 640 // Currently, the archive contain ONLY the following types of objects that have C++ vtables. 641 #define CPP_VTABLE_PATCH_TYPES_DO(f) \ 642 f(ConstantPool) \ 643 f(InstanceKlass) \ 644 f(InstanceClassLoaderKlass) \ 645 f(InstanceMirrorKlass) \ 646 f(InstanceRefKlass) \ 647 f(Method) \ 648 f(ObjArrayKlass) \ 649 f(TypeArrayKlass) 650 651 class CppVtableInfo { 652 intptr_t _vtable_size; 653 intptr_t _cloned_vtable[1]; 654 public: 655 static int num_slots(int vtable_size) { 656 return 1 + vtable_size; // Need to add the space occupied by _vtable_size; 657 } 658 int vtable_size() { return int(uintx(_vtable_size)); } 659 void set_vtable_size(int n) { _vtable_size = intptr_t(n); } 660 intptr_t* cloned_vtable() { return &_cloned_vtable[0]; } 661 void zero() { memset(_cloned_vtable, 0, sizeof(intptr_t) * vtable_size()); } 662 // Returns the address of the next CppVtableInfo that can be placed immediately after this CppVtableInfo 663 static size_t byte_size(int vtable_size) { 664 CppVtableInfo i; 665 return pointer_delta(&i._cloned_vtable[vtable_size], &i, sizeof(u1)); 666 } 667 }; 668 669 template <class T> class CppVtableCloner : public T { 670 static intptr_t* vtable_of(Metadata& m) { 671 return *((intptr_t**)&m); 672 } 673 static CppVtableInfo* _info; 674 675 static int get_vtable_length(const char* name); 676 677 public: 678 // Allocate and initialize the C++ vtable, starting from top, but do not go past end. 679 static intptr_t* allocate(const char* name); 680 681 // Clone the vtable to ... 682 static intptr_t* clone_vtable(const char* name, CppVtableInfo* info); 683 684 static void zero_vtable_clone() { 685 assert(DumpSharedSpaces, "dump-time only"); 686 _info->zero(); 687 } 688 689 // Switch the vtable pointer to point to the cloned vtable. 690 static void patch(Metadata* obj) { 691 assert(DumpSharedSpaces, "dump-time only"); 692 *(void**)obj = (void*)(_info->cloned_vtable()); 693 } 694 695 static bool is_valid_shared_object(const T* obj) { 696 intptr_t* vptr = *(intptr_t**)obj; 697 return vptr == _info->cloned_vtable(); 698 } 699 }; 700 701 template <class T> CppVtableInfo* CppVtableCloner<T>::_info = NULL; 702 703 template <class T> 704 intptr_t* CppVtableCloner<T>::allocate(const char* name) { 705 assert(is_aligned(_md_region.top(), sizeof(intptr_t)), "bad alignment"); 706 int n = get_vtable_length(name); 707 _info = (CppVtableInfo*)_md_region.allocate(CppVtableInfo::byte_size(n), sizeof(intptr_t)); 708 _info->set_vtable_size(n); 709 710 intptr_t* p = clone_vtable(name, _info); 711 assert((char*)p == _md_region.top(), "must be"); 712 713 return p; 714 } 715 716 template <class T> 717 intptr_t* CppVtableCloner<T>::clone_vtable(const char* name, CppVtableInfo* info) { 718 if (!DumpSharedSpaces) { 719 assert(_info == 0, "_info is initialized only at dump time"); 720 _info = info; // Remember it -- it will be used by MetaspaceShared::is_valid_shared_method() 721 } 722 T tmp; // Allocate temporary dummy metadata object to get to the original vtable. 723 int n = info->vtable_size(); 724 intptr_t* srcvtable = vtable_of(tmp); 725 intptr_t* dstvtable = info->cloned_vtable(); 726 727 // We already checked (and, if necessary, adjusted n) when the vtables were allocated, so we are 728 // safe to do memcpy. 729 log_debug(cds, vtables)("Copying %3d vtable entries for %s", n, name); 730 memcpy(dstvtable, srcvtable, sizeof(intptr_t) * n); 731 return dstvtable + n; 732 } 733 734 // To determine the size of the vtable for each type, we use the following 735 // trick by declaring 2 subclasses: 736 // 737 // class CppVtableTesterA: public InstanceKlass {virtual int last_virtual_method() {return 1;} }; 738 // class CppVtableTesterB: public InstanceKlass {virtual void* last_virtual_method() {return NULL}; }; 739 // 740 // CppVtableTesterA and CppVtableTesterB's vtables have the following properties: 741 // - Their size (N+1) is exactly one more than the size of InstanceKlass's vtable (N) 742 // - The first N entries have are exactly the same as in InstanceKlass's vtable. 743 // - Their last entry is different. 744 // 745 // So to determine the value of N, we just walk CppVtableTesterA and CppVtableTesterB's tables 746 // and find the first entry that's different. 747 // 748 // This works on all C++ compilers supported by Oracle, but you may need to tweak it for more 749 // esoteric compilers. 750 751 template <class T> class CppVtableTesterB: public T { 752 public: 753 virtual int last_virtual_method() {return 1;} 754 }; 755 756 template <class T> class CppVtableTesterA : public T { 757 public: 758 virtual void* last_virtual_method() { 759 // Make this different than CppVtableTesterB::last_virtual_method so the C++ 760 // compiler/linker won't alias the two functions. 761 return NULL; 762 } 763 }; 764 765 template <class T> 766 int CppVtableCloner<T>::get_vtable_length(const char* name) { 767 CppVtableTesterA<T> a; 768 CppVtableTesterB<T> b; 769 770 intptr_t* avtable = vtable_of(a); 771 intptr_t* bvtable = vtable_of(b); 772 773 // Start at slot 1, because slot 0 may be RTTI (on Solaris/Sparc) 774 int vtable_len = 1; 775 for (; ; vtable_len++) { 776 if (avtable[vtable_len] != bvtable[vtable_len]) { 777 break; 778 } 779 } 780 log_debug(cds, vtables)("Found %3d vtable entries for %s", vtable_len, name); 781 782 return vtable_len; 783 } 784 785 #define ALLOC_CPP_VTABLE_CLONE(c) \ 786 CppVtableCloner<c>::allocate(#c); 787 788 #define CLONE_CPP_VTABLE(c) \ 789 p = CppVtableCloner<c>::clone_vtable(#c, (CppVtableInfo*)p); 790 791 #define ZERO_CPP_VTABLE(c) \ 792 CppVtableCloner<c>::zero_vtable_clone(); 793 794 // This can be called at both dump time and run time. 795 intptr_t* MetaspaceShared::clone_cpp_vtables(intptr_t* p) { 796 assert(DumpSharedSpaces || UseSharedSpaces, "sanity"); 797 CPP_VTABLE_PATCH_TYPES_DO(CLONE_CPP_VTABLE); 798 return p; 799 } 800 801 void MetaspaceShared::zero_cpp_vtable_clones_for_writing() { 802 assert(DumpSharedSpaces, "dump-time only"); 803 CPP_VTABLE_PATCH_TYPES_DO(ZERO_CPP_VTABLE); 804 } 805 806 // Allocate and initialize the C++ vtables, starting from top, but do not go past end. 807 void MetaspaceShared::allocate_cpp_vtable_clones() { 808 assert(DumpSharedSpaces, "dump-time only"); 809 // Layout (each slot is a intptr_t): 810 // [number of slots in the first vtable = n1] 811 // [ <n1> slots for the first vtable] 812 // [number of slots in the first second = n2] 813 // [ <n2> slots for the second vtable] 814 // ... 815 // The order of the vtables is the same as the CPP_VTAB_PATCH_TYPES_DO macro. 816 CPP_VTABLE_PATCH_TYPES_DO(ALLOC_CPP_VTABLE_CLONE); 817 } 818 819 // Switch the vtable pointer to point to the cloned vtable. We assume the 820 // vtable pointer is in first slot in object. 821 void MetaspaceShared::patch_cpp_vtable_pointers() { 822 int n = _global_klass_objects->length(); 823 for (int i = 0; i < n; i++) { 824 Klass* obj = _global_klass_objects->at(i); 825 if (obj->is_instance_klass()) { 826 InstanceKlass* ik = InstanceKlass::cast(obj); 827 if (ik->is_class_loader_instance_klass()) { 828 CppVtableCloner<InstanceClassLoaderKlass>::patch(ik); 829 } else if (ik->is_reference_instance_klass()) { 830 CppVtableCloner<InstanceRefKlass>::patch(ik); 831 } else if (ik->is_mirror_instance_klass()) { 832 CppVtableCloner<InstanceMirrorKlass>::patch(ik); 833 } else { 834 CppVtableCloner<InstanceKlass>::patch(ik); 835 } 836 ConstantPool* cp = ik->constants(); 837 CppVtableCloner<ConstantPool>::patch(cp); 838 for (int j = 0; j < ik->methods()->length(); j++) { 839 Method* m = ik->methods()->at(j); 840 CppVtableCloner<Method>::patch(m); 841 assert(CppVtableCloner<Method>::is_valid_shared_object(m), "must be"); 842 } 843 } else if (obj->is_objArray_klass()) { 844 CppVtableCloner<ObjArrayKlass>::patch(obj); 845 } else { 846 assert(obj->is_typeArray_klass(), "sanity"); 847 CppVtableCloner<TypeArrayKlass>::patch(obj); 848 } 849 } 850 } 851 852 bool MetaspaceShared::is_valid_shared_method(const Method* m) { 853 assert(is_in_shared_metaspace(m), "must be"); 854 return CppVtableCloner<Method>::is_valid_shared_object(m); 855 } 856 857 // Closure for serializing initialization data out to a data area to be 858 // written to the shared file. 859 860 class WriteClosure : public SerializeClosure { 861 private: 862 DumpRegion* _dump_region; 863 864 public: 865 WriteClosure(DumpRegion* r) { 866 _dump_region = r; 867 } 868 869 void do_ptr(void** p) { 870 _dump_region->append_intptr_t((intptr_t)*p); 871 } 872 873 void do_u4(u4* p) { 874 void* ptr = (void*)(uintx(*p)); 875 do_ptr(&ptr); 876 } 877 878 void do_tag(int tag) { 879 _dump_region->append_intptr_t((intptr_t)tag); 880 } 881 882 void do_oop(oop* o) { 883 if (*o == NULL) { 884 _dump_region->append_intptr_t(0); 885 } else { 886 assert(MetaspaceShared::is_heap_object_archiving_allowed(), 887 "Archiving heap object is not allowed"); 888 _dump_region->append_intptr_t( 889 (intptr_t)CompressedOops::encode_not_null(*o)); 890 } 891 } 892 893 void do_region(u_char* start, size_t size) { 894 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment"); 895 assert(size % sizeof(intptr_t) == 0, "bad size"); 896 do_tag((int)size); 897 while (size > 0) { 898 _dump_region->append_intptr_t(*(intptr_t*)start); 899 start += sizeof(intptr_t); 900 size -= sizeof(intptr_t); 901 } 902 } 903 904 bool reading() const { return false; } 905 }; 906 907 // This is for dumping detailed statistics for the allocations 908 // in the shared spaces. 909 class DumpAllocStats : public ResourceObj { 910 public: 911 912 // Here's poor man's enum inheritance 913 #define SHAREDSPACE_OBJ_TYPES_DO(f) \ 914 METASPACE_OBJ_TYPES_DO(f) \ 915 f(SymbolHashentry) \ 916 f(SymbolBucket) \ 917 f(StringHashentry) \ 918 f(StringBucket) \ 919 f(Other) 920 921 enum Type { 922 // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc 923 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_DECLARE) 924 _number_of_types 925 }; 926 927 static const char * type_name(Type type) { 928 switch(type) { 929 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_NAME_CASE) 930 default: 931 ShouldNotReachHere(); 932 return NULL; 933 } 934 } 935 936 public: 937 enum { RO = 0, RW = 1 }; 938 939 int _counts[2][_number_of_types]; 940 int _bytes [2][_number_of_types]; 941 942 DumpAllocStats() { 943 memset(_counts, 0, sizeof(_counts)); 944 memset(_bytes, 0, sizeof(_bytes)); 945 }; 946 947 void record(MetaspaceObj::Type type, int byte_size, bool read_only) { 948 assert(int(type) >= 0 && type < MetaspaceObj::_number_of_types, "sanity"); 949 int which = (read_only) ? RO : RW; 950 _counts[which][type] ++; 951 _bytes [which][type] += byte_size; 952 } 953 954 void record_other_type(int byte_size, bool read_only) { 955 int which = (read_only) ? RO : RW; 956 _bytes [which][OtherType] += byte_size; 957 } 958 void print_stats(int ro_all, int rw_all, int mc_all, int md_all); 959 }; 960 961 void DumpAllocStats::print_stats(int ro_all, int rw_all, int mc_all, int md_all) { 962 // Calculate size of data that was not allocated by Metaspace::allocate() 963 MetaspaceSharedStats *stats = MetaspaceShared::stats(); 964 965 // symbols 966 _counts[RO][SymbolHashentryType] = stats->symbol.hashentry_count; 967 _bytes [RO][SymbolHashentryType] = stats->symbol.hashentry_bytes; 968 969 _counts[RO][SymbolBucketType] = stats->symbol.bucket_count; 970 _bytes [RO][SymbolBucketType] = stats->symbol.bucket_bytes; 971 972 // strings 973 _counts[RO][StringHashentryType] = stats->string.hashentry_count; 974 _bytes [RO][StringHashentryType] = stats->string.hashentry_bytes; 975 976 _counts[RO][StringBucketType] = stats->string.bucket_count; 977 _bytes [RO][StringBucketType] = stats->string.bucket_bytes; 978 979 // TODO: count things like dictionary, vtable, etc 980 _bytes[RW][OtherType] += mc_all + md_all; 981 rw_all += mc_all + md_all; // mc/md are mapped Read/Write 982 983 // prevent divide-by-zero 984 if (ro_all < 1) { 985 ro_all = 1; 986 } 987 if (rw_all < 1) { 988 rw_all = 1; 989 } 990 991 int all_ro_count = 0; 992 int all_ro_bytes = 0; 993 int all_rw_count = 0; 994 int all_rw_bytes = 0; 995 996 // To make fmt_stats be a syntactic constant (for format warnings), use #define. 997 #define fmt_stats "%-20s: %8d %10d %5.1f | %8d %10d %5.1f | %8d %10d %5.1f" 998 const char *sep = "--------------------+---------------------------+---------------------------+--------------------------"; 999 const char *hdr = " ro_cnt ro_bytes % | rw_cnt rw_bytes % | all_cnt all_bytes %"; 1000 1001 LogMessage(cds) msg; 1002 1003 msg.info("Detailed metadata info (excluding od/st regions; rw stats include md/mc regions):"); 1004 msg.info("%s", hdr); 1005 msg.info("%s", sep); 1006 for (int type = 0; type < int(_number_of_types); type ++) { 1007 const char *name = type_name((Type)type); 1008 int ro_count = _counts[RO][type]; 1009 int ro_bytes = _bytes [RO][type]; 1010 int rw_count = _counts[RW][type]; 1011 int rw_bytes = _bytes [RW][type]; 1012 int count = ro_count + rw_count; 1013 int bytes = ro_bytes + rw_bytes; 1014 1015 double ro_perc = percent_of(ro_bytes, ro_all); 1016 double rw_perc = percent_of(rw_bytes, rw_all); 1017 double perc = percent_of(bytes, ro_all + rw_all); 1018 1019 msg.info(fmt_stats, name, 1020 ro_count, ro_bytes, ro_perc, 1021 rw_count, rw_bytes, rw_perc, 1022 count, bytes, perc); 1023 1024 all_ro_count += ro_count; 1025 all_ro_bytes += ro_bytes; 1026 all_rw_count += rw_count; 1027 all_rw_bytes += rw_bytes; 1028 } 1029 1030 int all_count = all_ro_count + all_rw_count; 1031 int all_bytes = all_ro_bytes + all_rw_bytes; 1032 1033 double all_ro_perc = percent_of(all_ro_bytes, ro_all); 1034 double all_rw_perc = percent_of(all_rw_bytes, rw_all); 1035 double all_perc = percent_of(all_bytes, ro_all + rw_all); 1036 1037 msg.info("%s", sep); 1038 msg.info(fmt_stats, "Total", 1039 all_ro_count, all_ro_bytes, all_ro_perc, 1040 all_rw_count, all_rw_bytes, all_rw_perc, 1041 all_count, all_bytes, all_perc); 1042 1043 assert(all_ro_bytes == ro_all, "everything should have been counted"); 1044 assert(all_rw_bytes == rw_all, "everything should have been counted"); 1045 1046 #undef fmt_stats 1047 } 1048 1049 // Populate the shared space. 1050 1051 class VM_PopulateDumpSharedSpace: public VM_Operation { 1052 private: 1053 GrowableArray<MemRegion> *_closed_archive_heap_regions; 1054 GrowableArray<MemRegion> *_open_archive_heap_regions; 1055 1056 void dump_java_heap_objects() NOT_CDS_JAVA_HEAP_RETURN; 1057 void dump_symbols(); 1058 char* dump_read_only_tables(); 1059 void print_region_stats(); 1060 void print_heap_region_stats(GrowableArray<MemRegion> *heap_mem, 1061 const char *name, const size_t total_size); 1062 public: 1063 1064 VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; } 1065 void doit(); // outline because gdb sucks 1066 static void write_region(FileMapInfo* mapinfo, int region, DumpRegion* space, bool read_only, bool allow_exec); 1067 bool allow_nested_vm_operations() const { return true; } 1068 }; // class VM_PopulateDumpSharedSpace 1069 1070 class SortedSymbolClosure: public SymbolClosure { 1071 GrowableArray<Symbol*> _symbols; 1072 virtual void do_symbol(Symbol** sym) { 1073 assert((*sym)->is_permanent(), "archived symbols must be permanent"); 1074 _symbols.append(*sym); 1075 } 1076 static int compare_symbols_by_address(Symbol** a, Symbol** b) { 1077 if (a[0] < b[0]) { 1078 return -1; 1079 } else if (a[0] == b[0]) { 1080 return 0; 1081 } else { 1082 return 1; 1083 } 1084 } 1085 1086 public: 1087 SortedSymbolClosure() { 1088 SymbolTable::symbols_do(this); 1089 _symbols.sort(compare_symbols_by_address); 1090 } 1091 GrowableArray<Symbol*>* get_sorted_symbols() { 1092 return &_symbols; 1093 } 1094 }; 1095 1096 // ArchiveCompactor -- 1097 // 1098 // This class is the central piece of shared archive compaction -- all metaspace data are 1099 // initially allocated outside of the shared regions. ArchiveCompactor copies the 1100 // metaspace data into their final location in the shared regions. 1101 1102 class ArchiveCompactor : AllStatic { 1103 static DumpAllocStats* _alloc_stats; 1104 static SortedSymbolClosure* _ssc; 1105 1106 static unsigned my_hash(const address& a) { 1107 return primitive_hash<address>(a); 1108 } 1109 static bool my_equals(const address& a0, const address& a1) { 1110 return primitive_equals<address>(a0, a1); 1111 } 1112 typedef ResourceHashtable< 1113 address, address, 1114 ArchiveCompactor::my_hash, // solaris compiler doesn't like: primitive_hash<address> 1115 ArchiveCompactor::my_equals, // solaris compiler doesn't like: primitive_equals<address> 1116 16384, ResourceObj::C_HEAP> RelocationTable; 1117 static RelocationTable* _new_loc_table; 1118 1119 public: 1120 static void initialize() { 1121 _alloc_stats = new(ResourceObj::C_HEAP, mtInternal)DumpAllocStats; 1122 _new_loc_table = new(ResourceObj::C_HEAP, mtInternal)RelocationTable; 1123 } 1124 static DumpAllocStats* alloc_stats() { 1125 return _alloc_stats; 1126 } 1127 1128 static void allocate(MetaspaceClosure::Ref* ref, bool read_only) { 1129 address obj = ref->obj(); 1130 int bytes = ref->size() * BytesPerWord; 1131 char* p; 1132 size_t alignment = BytesPerWord; 1133 char* oldtop; 1134 char* newtop; 1135 1136 if (read_only) { 1137 oldtop = _ro_region.top(); 1138 p = _ro_region.allocate(bytes, alignment); 1139 newtop = _ro_region.top(); 1140 } else { 1141 oldtop = _rw_region.top(); 1142 p = _rw_region.allocate(bytes, alignment); 1143 newtop = _rw_region.top(); 1144 } 1145 memcpy(p, obj, bytes); 1146 bool isnew = _new_loc_table->put(obj, (address)p); 1147 log_trace(cds)("Copy: " PTR_FORMAT " ==> " PTR_FORMAT " %d", p2i(obj), p2i(p), bytes); 1148 assert(isnew, "must be"); 1149 1150 _alloc_stats->record(ref->msotype(), int(newtop - oldtop), read_only); 1151 if (ref->msotype() == MetaspaceObj::SymbolType) { 1152 uintx delta = MetaspaceShared::object_delta(p); 1153 if (delta > MAX_SHARED_DELTA) { 1154 // This is just a sanity check and should not appear in any real world usage. This 1155 // happens only if you allocate more than 2GB of Symbols and would require 1156 // millions of shared classes. 1157 vm_exit_during_initialization("Too many Symbols in the CDS archive", 1158 "Please reduce the number of shared classes."); 1159 } 1160 } 1161 } 1162 1163 static address get_new_loc(MetaspaceClosure::Ref* ref) { 1164 address* pp = _new_loc_table->get(ref->obj()); 1165 assert(pp != NULL, "must be"); 1166 return *pp; 1167 } 1168 1169 private: 1170 // Makes a shallow copy of visited MetaspaceObj's 1171 class ShallowCopier: public UniqueMetaspaceClosure { 1172 bool _read_only; 1173 public: 1174 ShallowCopier(bool read_only) : _read_only(read_only) {} 1175 1176 virtual void do_unique_ref(Ref* ref, bool read_only) { 1177 if (read_only == _read_only) { 1178 allocate(ref, read_only); 1179 } 1180 } 1181 }; 1182 1183 // Relocate embedded pointers within a MetaspaceObj's shallow copy 1184 class ShallowCopyEmbeddedRefRelocator: public UniqueMetaspaceClosure { 1185 public: 1186 virtual void do_unique_ref(Ref* ref, bool read_only) { 1187 address new_loc = get_new_loc(ref); 1188 RefRelocator refer; 1189 ref->metaspace_pointers_do_at(&refer, new_loc); 1190 } 1191 }; 1192 1193 // Relocate a reference to point to its shallow copy 1194 class RefRelocator: public MetaspaceClosure { 1195 public: 1196 virtual bool do_ref(Ref* ref, bool read_only) { 1197 if (ref->not_null()) { 1198 ref->update(get_new_loc(ref)); 1199 } 1200 return false; // Do not recurse. 1201 } 1202 }; 1203 1204 #ifdef ASSERT 1205 class IsRefInArchiveChecker: public MetaspaceClosure { 1206 public: 1207 virtual bool do_ref(Ref* ref, bool read_only) { 1208 if (ref->not_null()) { 1209 char* obj = (char*)ref->obj(); 1210 assert(_ro_region.contains(obj) || _rw_region.contains(obj), 1211 "must be relocated to point to CDS archive"); 1212 } 1213 return false; // Do not recurse. 1214 } 1215 }; 1216 #endif 1217 1218 public: 1219 static void copy_and_compact() { 1220 // We should no longer allocate anything from the metaspace, so that 1221 // we can have a stable set of MetaspaceObjs to work with. 1222 Metaspace::freeze(); 1223 1224 ResourceMark rm; 1225 SortedSymbolClosure the_ssc; // StackObj 1226 _ssc = &the_ssc; 1227 1228 tty->print_cr("Scanning all metaspace objects ... "); 1229 { 1230 // allocate and shallow-copy RW objects, immediately following the MC region 1231 tty->print_cr("Allocating RW objects ... "); 1232 _mc_region.pack(&_rw_region); 1233 1234 ResourceMark rm; 1235 ShallowCopier rw_copier(false); 1236 iterate_roots(&rw_copier); 1237 } 1238 { 1239 // allocate and shallow-copy of RO object, immediately following the RW region 1240 tty->print_cr("Allocating RO objects ... "); 1241 _rw_region.pack(&_ro_region); 1242 1243 ResourceMark rm; 1244 ShallowCopier ro_copier(true); 1245 iterate_roots(&ro_copier); 1246 } 1247 { 1248 tty->print_cr("Relocating embedded pointers ... "); 1249 ResourceMark rm; 1250 ShallowCopyEmbeddedRefRelocator emb_reloc; 1251 iterate_roots(&emb_reloc); 1252 } 1253 { 1254 tty->print_cr("Relocating external roots ... "); 1255 ResourceMark rm; 1256 RefRelocator ext_reloc; 1257 iterate_roots(&ext_reloc); 1258 } 1259 1260 #ifdef ASSERT 1261 { 1262 tty->print_cr("Verifying external roots ... "); 1263 ResourceMark rm; 1264 IsRefInArchiveChecker checker; 1265 iterate_roots(&checker); 1266 } 1267 #endif 1268 1269 1270 // cleanup 1271 _ssc = NULL; 1272 } 1273 1274 // We must relocate the System::_well_known_klasses only after we have copied the 1275 // java objects in during dump_java_heap_objects(): during the object copy, we operate on 1276 // old objects which assert that their klass is the original klass. 1277 static void relocate_well_known_klasses() { 1278 { 1279 tty->print_cr("Relocating SystemDictionary::_well_known_klasses[] ... "); 1280 ResourceMark rm; 1281 RefRelocator ext_reloc; 1282 SystemDictionary::well_known_klasses_do(&ext_reloc); 1283 } 1284 // NOTE: after this point, we shouldn't have any globals that can reach the old 1285 // objects. 1286 1287 // We cannot use any of the objects in the heap anymore (except for the objects 1288 // in the CDS shared string regions) because their headers no longer point to 1289 // valid Klasses. 1290 } 1291 1292 static void iterate_roots(MetaspaceClosure* it) { 1293 GrowableArray<Symbol*>* symbols = _ssc->get_sorted_symbols(); 1294 for (int i=0; i<symbols->length(); i++) { 1295 it->push(symbols->adr_at(i)); 1296 } 1297 if (_global_klass_objects != NULL) { 1298 // Need to fix up the pointers 1299 for (int i = 0; i < _global_klass_objects->length(); i++) { 1300 // NOTE -- this requires that the vtable is NOT yet patched, or else we are hosed. 1301 it->push(_global_klass_objects->adr_at(i)); 1302 } 1303 } 1304 FileMapInfo::metaspace_pointers_do(it); 1305 SystemDictionary::classes_do(it); 1306 Universe::metaspace_pointers_do(it); 1307 SymbolTable::metaspace_pointers_do(it); 1308 vmSymbols::metaspace_pointers_do(it); 1309 } 1310 1311 static Klass* get_relocated_klass(Klass* orig_klass) { 1312 assert(DumpSharedSpaces, "dump time only"); 1313 address* pp = _new_loc_table->get((address)orig_klass); 1314 assert(pp != NULL, "must be"); 1315 Klass* klass = (Klass*)(*pp); 1316 assert(klass->is_klass(), "must be"); 1317 return klass; 1318 } 1319 }; 1320 1321 DumpAllocStats* ArchiveCompactor::_alloc_stats; 1322 SortedSymbolClosure* ArchiveCompactor::_ssc; 1323 ArchiveCompactor::RelocationTable* ArchiveCompactor::_new_loc_table; 1324 1325 void VM_PopulateDumpSharedSpace::write_region(FileMapInfo* mapinfo, int region_idx, 1326 DumpRegion* dump_region, bool read_only, bool allow_exec) { 1327 mapinfo->write_region(region_idx, dump_region->base(), dump_region->used(), read_only, allow_exec); 1328 } 1329 1330 void VM_PopulateDumpSharedSpace::dump_symbols() { 1331 tty->print_cr("Dumping symbol table ..."); 1332 1333 NOT_PRODUCT(SymbolTable::verify()); 1334 SymbolTable::write_to_archive(); 1335 } 1336 1337 char* VM_PopulateDumpSharedSpace::dump_read_only_tables() { 1338 char* oldtop = _ro_region.top(); 1339 // Reorder the system dictionary. Moving the symbols affects 1340 // how the hash table indices are calculated. 1341 SystemDictionary::reorder_dictionary_for_sharing(); 1342 1343 tty->print("Removing java_mirror ... "); 1344 if (!MetaspaceShared::is_heap_object_archiving_allowed()) { 1345 clear_basic_type_mirrors(); 1346 } 1347 remove_java_mirror_in_classes(); 1348 tty->print_cr("done. "); 1349 NOT_PRODUCT(SystemDictionary::verify();) 1350 1351 size_t buckets_bytes = SystemDictionary::count_bytes_for_buckets(); 1352 char* buckets_top = _ro_region.allocate(buckets_bytes, sizeof(intptr_t)); 1353 SystemDictionary::copy_buckets(buckets_top, _ro_region.top()); 1354 1355 size_t table_bytes = SystemDictionary::count_bytes_for_table(); 1356 char* table_top = _ro_region.allocate(table_bytes, sizeof(intptr_t)); 1357 SystemDictionary::copy_table(table_top, _ro_region.top()); 1358 1359 // Write the archived object sub-graph infos. For each klass with sub-graphs, 1360 // the info includes the static fields (sub-graph entry points) and Klasses 1361 // of objects included in the sub-graph. 1362 HeapShared::write_archived_subgraph_infos(); 1363 1364 // Write the other data to the output array. 1365 WriteClosure wc(&_ro_region); 1366 MetaspaceShared::serialize(&wc); 1367 1368 char* newtop = _ro_region.top(); 1369 ArchiveCompactor::alloc_stats()->record_other_type(int(newtop - oldtop), true); 1370 return buckets_top; 1371 } 1372 1373 void VM_PopulateDumpSharedSpace::doit() { 1374 Thread* THREAD = VMThread::vm_thread(); 1375 1376 FileMapInfo::check_nonempty_dir_in_shared_path_table(); 1377 1378 NOT_PRODUCT(SystemDictionary::verify();) 1379 // The following guarantee is meant to ensure that no loader constraints 1380 // exist yet, since the constraints table is not shared. This becomes 1381 // more important now that we don't re-initialize vtables/itables for 1382 // shared classes at runtime, where constraints were previously created. 1383 guarantee(SystemDictionary::constraints()->number_of_entries() == 0, 1384 "loader constraints are not saved"); 1385 guarantee(SystemDictionary::placeholders()->number_of_entries() == 0, 1386 "placeholders are not saved"); 1387 // Revisit and implement this if we prelink method handle call sites: 1388 guarantee(SystemDictionary::invoke_method_table() == NULL || 1389 SystemDictionary::invoke_method_table()->number_of_entries() == 0, 1390 "invoke method table is not saved"); 1391 1392 // At this point, many classes have been loaded. 1393 // Gather systemDictionary classes in a global array and do everything to 1394 // that so we don't have to walk the SystemDictionary again. 1395 _global_klass_objects = new GrowableArray<Klass*>(1000); 1396 CollectClassesClosure collect_classes; 1397 ClassLoaderDataGraph::loaded_classes_do(&collect_classes); 1398 1399 tty->print_cr("Number of classes %d", _global_klass_objects->length()); 1400 { 1401 int num_type_array = 0, num_obj_array = 0, num_inst = 0; 1402 for (int i = 0; i < _global_klass_objects->length(); i++) { 1403 Klass* k = _global_klass_objects->at(i); 1404 if (k->is_instance_klass()) { 1405 num_inst ++; 1406 } else if (k->is_objArray_klass()) { 1407 num_obj_array ++; 1408 } else { 1409 assert(k->is_typeArray_klass(), "sanity"); 1410 num_type_array ++; 1411 } 1412 } 1413 tty->print_cr(" instance classes = %5d", num_inst); 1414 tty->print_cr(" obj array classes = %5d", num_obj_array); 1415 tty->print_cr(" type array classes = %5d", num_type_array); 1416 } 1417 1418 // Ensure the ConstMethods won't be modified at run-time 1419 tty->print("Updating ConstMethods ... "); 1420 rewrite_nofast_bytecodes_and_calculate_fingerprints(); 1421 tty->print_cr("done. "); 1422 1423 // Move classes from platform/system dictionaries into the boot dictionary 1424 SystemDictionary::combine_shared_dictionaries(); 1425 1426 // Make sure all classes have a correct loader type. 1427 ClassLoaderData::the_null_class_loader_data()->dictionary()->classes_do(MetaspaceShared::check_shared_class_loader_type); 1428 1429 // Remove all references outside the metadata 1430 tty->print("Removing unshareable information ... "); 1431 remove_unshareable_in_classes(); 1432 tty->print_cr("done. "); 1433 1434 // We don't support archiving anonymous classes. Verify that they are not stored in 1435 // the any dictionaries. 1436 NOT_PRODUCT(assert_no_anonymoys_classes_in_dictionaries()); 1437 1438 SystemDictionaryShared::finalize_verification_constraints(); 1439 1440 ArchiveCompactor::initialize(); 1441 ArchiveCompactor::copy_and_compact(); 1442 1443 dump_symbols(); 1444 1445 // Dump supported java heap objects 1446 _closed_archive_heap_regions = NULL; 1447 _open_archive_heap_regions = NULL; 1448 dump_java_heap_objects(); 1449 1450 ArchiveCompactor::relocate_well_known_klasses(); 1451 1452 char* read_only_tables_start = dump_read_only_tables(); 1453 _ro_region.pack(&_md_region); 1454 1455 char* vtbl_list = _md_region.top(); 1456 MetaspaceShared::allocate_cpp_vtable_clones(); 1457 _md_region.pack(&_od_region); 1458 1459 // Relocate the archived class file data into the od region 1460 relocate_cached_class_file(); 1461 _od_region.pack(); 1462 1463 // The 5 core spaces are allocated consecutively mc->rw->ro->md->od, so there total size 1464 // is just the spaces between the two ends. 1465 size_t core_spaces_size = _od_region.end() - _mc_region.base(); 1466 assert(core_spaces_size == (size_t)align_up(core_spaces_size, Metaspace::reserve_alignment()), 1467 "should already be aligned"); 1468 1469 // During patching, some virtual methods may be called, so at this point 1470 // the vtables must contain valid methods (as filled in by CppVtableCloner::allocate). 1471 MetaspaceShared::patch_cpp_vtable_pointers(); 1472 1473 // The vtable clones contain addresses of the current process. 1474 // We don't want to write these addresses into the archive. 1475 MetaspaceShared::zero_cpp_vtable_clones_for_writing(); 1476 1477 // Create and write the archive file that maps the shared spaces. 1478 1479 FileMapInfo* mapinfo = new FileMapInfo(); 1480 mapinfo->populate_header(os::vm_allocation_granularity()); 1481 mapinfo->set_read_only_tables_start(read_only_tables_start); 1482 mapinfo->set_misc_data_patching_start(vtbl_list); 1483 mapinfo->set_cds_i2i_entry_code_buffers(MetaspaceShared::cds_i2i_entry_code_buffers()); 1484 mapinfo->set_cds_i2i_entry_code_buffers_size(MetaspaceShared::cds_i2i_entry_code_buffers_size()); 1485 mapinfo->set_core_spaces_size(core_spaces_size); 1486 1487 for (int pass=1; pass<=2; pass++) { 1488 if (pass == 1) { 1489 // The first pass doesn't actually write the data to disk. All it 1490 // does is to update the fields in the mapinfo->_header. 1491 } else { 1492 // After the first pass, the contents of mapinfo->_header are finalized, 1493 // so we can compute the header's CRC, and write the contents of the header 1494 // and the regions into disk. 1495 mapinfo->open_for_write(); 1496 mapinfo->set_header_crc(mapinfo->compute_header_crc()); 1497 } 1498 mapinfo->write_header(); 1499 1500 // NOTE: md contains the trampoline code for method entries, which are patched at run time, 1501 // so it needs to be read/write. 1502 write_region(mapinfo, MetaspaceShared::mc, &_mc_region, /*read_only=*/false,/*allow_exec=*/true); 1503 write_region(mapinfo, MetaspaceShared::rw, &_rw_region, /*read_only=*/false,/*allow_exec=*/false); 1504 write_region(mapinfo, MetaspaceShared::ro, &_ro_region, /*read_only=*/true, /*allow_exec=*/false); 1505 write_region(mapinfo, MetaspaceShared::md, &_md_region, /*read_only=*/false,/*allow_exec=*/false); 1506 write_region(mapinfo, MetaspaceShared::od, &_od_region, /*read_only=*/true, /*allow_exec=*/false); 1507 1508 _total_string_region_size = mapinfo->write_archive_heap_regions( 1509 _closed_archive_heap_regions, 1510 MetaspaceShared::first_string, 1511 MetaspaceShared::max_strings); 1512 _total_open_archive_region_size = mapinfo->write_archive_heap_regions( 1513 _open_archive_heap_regions, 1514 MetaspaceShared::first_open_archive_heap_region, 1515 MetaspaceShared::max_open_archive_heap_region); 1516 } 1517 1518 mapinfo->close(); 1519 1520 // Restore the vtable in case we invoke any virtual methods. 1521 MetaspaceShared::clone_cpp_vtables((intptr_t*)vtbl_list); 1522 1523 print_region_stats(); 1524 1525 if (log_is_enabled(Info, cds)) { 1526 ArchiveCompactor::alloc_stats()->print_stats(int(_ro_region.used()), int(_rw_region.used()), 1527 int(_mc_region.used()), int(_md_region.used())); 1528 } 1529 1530 if (PrintSystemDictionaryAtExit) { 1531 SystemDictionary::print(); 1532 } 1533 // There may be other pending VM operations that operate on the InstanceKlasses, 1534 // which will fail because InstanceKlasses::remove_unshareable_info() 1535 // has been called. Forget these operations and exit the VM directly. 1536 vm_direct_exit(0); 1537 } 1538 1539 void VM_PopulateDumpSharedSpace::print_region_stats() { 1540 // Print statistics of all the regions 1541 const size_t total_reserved = _ro_region.reserved() + _rw_region.reserved() + 1542 _mc_region.reserved() + _md_region.reserved() + 1543 _od_region.reserved() + 1544 _total_string_region_size + 1545 _total_open_archive_region_size; 1546 const size_t total_bytes = _ro_region.used() + _rw_region.used() + 1547 _mc_region.used() + _md_region.used() + 1548 _od_region.used() + 1549 _total_string_region_size + 1550 _total_open_archive_region_size; 1551 const double total_u_perc = percent_of(total_bytes, total_reserved); 1552 1553 _mc_region.print(total_reserved); 1554 _rw_region.print(total_reserved); 1555 _ro_region.print(total_reserved); 1556 _md_region.print(total_reserved); 1557 _od_region.print(total_reserved); 1558 print_heap_region_stats(_closed_archive_heap_regions, "st", total_reserved); 1559 print_heap_region_stats(_open_archive_heap_regions, "oa", total_reserved); 1560 1561 tty->print_cr("total : " SIZE_FORMAT_W(9) " [100.0%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used]", 1562 total_bytes, total_reserved, total_u_perc); 1563 } 1564 1565 void VM_PopulateDumpSharedSpace::print_heap_region_stats(GrowableArray<MemRegion> *heap_mem, 1566 const char *name, const size_t total_size) { 1567 int arr_len = heap_mem == NULL ? 0 : heap_mem->length(); 1568 for (int i = 0; i < arr_len; i++) { 1569 char* start = (char*)heap_mem->at(i).start(); 1570 size_t size = heap_mem->at(i).byte_size(); 1571 char* top = start + size; 1572 tty->print_cr("%s%d space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [100.0%% used] at " INTPTR_FORMAT, 1573 name, i, size, size/double(total_size)*100.0, size, p2i(start)); 1574 1575 } 1576 } 1577 1578 // Update a Java object to point its Klass* to the new location after 1579 // shared archive has been compacted. 1580 void MetaspaceShared::relocate_klass_ptr(oop o) { 1581 assert(DumpSharedSpaces, "sanity"); 1582 Klass* k = ArchiveCompactor::get_relocated_klass(o->klass()); 1583 o->set_klass(k); 1584 } 1585 1586 Klass* MetaspaceShared::get_relocated_klass(Klass *k) { 1587 assert(DumpSharedSpaces, "sanity"); 1588 return ArchiveCompactor::get_relocated_klass(k); 1589 } 1590 1591 class LinkSharedClassesClosure : public KlassClosure { 1592 Thread* THREAD; 1593 bool _made_progress; 1594 public: 1595 LinkSharedClassesClosure(Thread* thread) : THREAD(thread), _made_progress(false) {} 1596 1597 void reset() { _made_progress = false; } 1598 bool made_progress() const { return _made_progress; } 1599 1600 void do_klass(Klass* k) { 1601 if (k->is_instance_klass()) { 1602 InstanceKlass* ik = InstanceKlass::cast(k); 1603 // Link the class to cause the bytecodes to be rewritten and the 1604 // cpcache to be created. Class verification is done according 1605 // to -Xverify setting. 1606 _made_progress |= MetaspaceShared::try_link_class(ik, THREAD); 1607 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class"); 1608 1609 ik->constants()->resolve_class_constants(THREAD); 1610 } 1611 } 1612 }; 1613 1614 class CheckSharedClassesClosure : public KlassClosure { 1615 bool _made_progress; 1616 public: 1617 CheckSharedClassesClosure() : _made_progress(false) {} 1618 1619 void reset() { _made_progress = false; } 1620 bool made_progress() const { return _made_progress; } 1621 void do_klass(Klass* k) { 1622 if (k->is_instance_klass() && InstanceKlass::cast(k)->check_sharing_error_state()) { 1623 _made_progress = true; 1624 } 1625 } 1626 }; 1627 1628 void MetaspaceShared::check_shared_class_loader_type(InstanceKlass* ik) { 1629 ResourceMark rm; 1630 if (ik->shared_classpath_index() == UNREGISTERED_INDEX) { 1631 guarantee(ik->loader_type() == 0, 1632 "Class loader type must not be set for this class %s", ik->name()->as_C_string()); 1633 } else { 1634 guarantee(ik->loader_type() != 0, 1635 "Class loader type must be set for this class %s", ik->name()->as_C_string()); 1636 } 1637 } 1638 1639 void MetaspaceShared::link_and_cleanup_shared_classes(TRAPS) { 1640 // We need to iterate because verification may cause additional classes 1641 // to be loaded. 1642 LinkSharedClassesClosure link_closure(THREAD); 1643 do { 1644 link_closure.reset(); 1645 ClassLoaderDataGraph::loaded_classes_do(&link_closure); 1646 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class"); 1647 } while (link_closure.made_progress()); 1648 1649 if (_has_error_classes) { 1650 // Mark all classes whose super class or interfaces failed verification. 1651 CheckSharedClassesClosure check_closure; 1652 do { 1653 // Not completely sure if we need to do this iteratively. Anyway, 1654 // we should come here only if there are unverifiable classes, which 1655 // shouldn't happen in normal cases. So better safe than sorry. 1656 check_closure.reset(); 1657 ClassLoaderDataGraph::loaded_classes_do(&check_closure); 1658 } while (check_closure.made_progress()); 1659 1660 if (IgnoreUnverifiableClassesDuringDump) { 1661 // This is useful when running JCK or SQE tests. You should not 1662 // enable this when running real apps. 1663 SystemDictionary::remove_classes_in_error_state(); 1664 } else { 1665 tty->print_cr("Please remove the unverifiable classes from your class list and try again"); 1666 exit(1); 1667 } 1668 } 1669 } 1670 1671 void MetaspaceShared::prepare_for_dumping() { 1672 Arguments::check_unsupported_dumping_properties(); 1673 ClassLoader::initialize_shared_path(); 1674 } 1675 1676 // Preload classes from a list, populate the shared spaces and dump to a 1677 // file. 1678 void MetaspaceShared::preload_and_dump(TRAPS) { 1679 { TraceTime timer("Dump Shared Spaces", TRACETIME_LOG(Info, startuptime)); 1680 ResourceMark rm; 1681 char class_list_path_str[JVM_MAXPATHLEN]; 1682 // Preload classes to be shared. 1683 // Should use some os:: method rather than fopen() here. aB. 1684 const char* class_list_path; 1685 if (SharedClassListFile == NULL) { 1686 // Construct the path to the class list (in jre/lib) 1687 // Walk up two directories from the location of the VM and 1688 // optionally tack on "lib" (depending on platform) 1689 os::jvm_path(class_list_path_str, sizeof(class_list_path_str)); 1690 for (int i = 0; i < 3; i++) { 1691 char *end = strrchr(class_list_path_str, *os::file_separator()); 1692 if (end != NULL) *end = '\0'; 1693 } 1694 int class_list_path_len = (int)strlen(class_list_path_str); 1695 if (class_list_path_len >= 3) { 1696 if (strcmp(class_list_path_str + class_list_path_len - 3, "lib") != 0) { 1697 if (class_list_path_len < JVM_MAXPATHLEN - 4) { 1698 jio_snprintf(class_list_path_str + class_list_path_len, 1699 sizeof(class_list_path_str) - class_list_path_len, 1700 "%slib", os::file_separator()); 1701 class_list_path_len += 4; 1702 } 1703 } 1704 } 1705 if (class_list_path_len < JVM_MAXPATHLEN - 10) { 1706 jio_snprintf(class_list_path_str + class_list_path_len, 1707 sizeof(class_list_path_str) - class_list_path_len, 1708 "%sclasslist", os::file_separator()); 1709 } 1710 class_list_path = class_list_path_str; 1711 } else { 1712 class_list_path = SharedClassListFile; 1713 } 1714 1715 tty->print_cr("Loading classes to share ..."); 1716 _has_error_classes = false; 1717 int class_count = preload_classes(class_list_path, THREAD); 1718 if (ExtraSharedClassListFile) { 1719 class_count += preload_classes(ExtraSharedClassListFile, THREAD); 1720 } 1721 tty->print_cr("Loading classes to share: done."); 1722 1723 log_info(cds)("Shared spaces: preloaded %d classes", class_count); 1724 1725 // Rewrite and link classes 1726 tty->print_cr("Rewriting and linking classes ..."); 1727 1728 // Link any classes which got missed. This would happen if we have loaded classes that 1729 // were not explicitly specified in the classlist. E.g., if an interface implemented by class K 1730 // fails verification, all other interfaces that were not specified in the classlist but 1731 // are implemented by K are not verified. 1732 link_and_cleanup_shared_classes(CATCH); 1733 tty->print_cr("Rewriting and linking classes: done"); 1734 1735 SystemDictionary::clear_invoke_method_table(); 1736 1737 VM_PopulateDumpSharedSpace op; 1738 VMThread::execute(&op); 1739 } 1740 } 1741 1742 1743 int MetaspaceShared::preload_classes(const char* class_list_path, TRAPS) { 1744 ClassListParser parser(class_list_path); 1745 int class_count = 0; 1746 1747 while (parser.parse_one_line()) { 1748 Klass* klass = ClassLoaderExt::load_one_class(&parser, THREAD); 1749 if (HAS_PENDING_EXCEPTION) { 1750 if (klass == NULL && 1751 (PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_ClassNotFoundException())) { 1752 // print a warning only when the pending exception is class not found 1753 tty->print_cr("Preload Warning: Cannot find %s", parser.current_class_name()); 1754 } 1755 CLEAR_PENDING_EXCEPTION; 1756 } 1757 if (klass != NULL) { 1758 if (log_is_enabled(Trace, cds)) { 1759 ResourceMark rm; 1760 log_trace(cds)("Shared spaces preloaded: %s", klass->external_name()); 1761 } 1762 1763 if (klass->is_instance_klass()) { 1764 InstanceKlass* ik = InstanceKlass::cast(klass); 1765 1766 // Link the class to cause the bytecodes to be rewritten and the 1767 // cpcache to be created. The linking is done as soon as classes 1768 // are loaded in order that the related data structures (klass and 1769 // cpCache) are located together. 1770 try_link_class(ik, THREAD); 1771 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class"); 1772 } 1773 1774 class_count++; 1775 } 1776 } 1777 1778 return class_count; 1779 } 1780 1781 // Returns true if the class's status has changed 1782 bool MetaspaceShared::try_link_class(InstanceKlass* ik, TRAPS) { 1783 assert(DumpSharedSpaces, "should only be called during dumping"); 1784 if (ik->init_state() < InstanceKlass::linked) { 1785 bool saved = BytecodeVerificationLocal; 1786 if (ik->loader_type() == 0 && ik->class_loader() == NULL) { 1787 // The verification decision is based on BytecodeVerificationRemote 1788 // for non-system classes. Since we are using the NULL classloader 1789 // to load non-system classes for customized class loaders during dumping, 1790 // we need to temporarily change BytecodeVerificationLocal to be the same as 1791 // BytecodeVerificationRemote. Note this can cause the parent system 1792 // classes also being verified. The extra overhead is acceptable during 1793 // dumping. 1794 BytecodeVerificationLocal = BytecodeVerificationRemote; 1795 } 1796 ik->link_class(THREAD); 1797 if (HAS_PENDING_EXCEPTION) { 1798 ResourceMark rm; 1799 tty->print_cr("Preload Warning: Verification failed for %s", 1800 ik->external_name()); 1801 CLEAR_PENDING_EXCEPTION; 1802 ik->set_in_error_state(); 1803 _has_error_classes = true; 1804 } 1805 BytecodeVerificationLocal = saved; 1806 return true; 1807 } else { 1808 return false; 1809 } 1810 } 1811 1812 #if INCLUDE_CDS_JAVA_HEAP 1813 void VM_PopulateDumpSharedSpace::dump_java_heap_objects() { 1814 if (!MetaspaceShared::is_heap_object_archiving_allowed()) { 1815 if (log_is_enabled(Info, cds)) { 1816 log_info(cds)( 1817 "Archived java heap is not supported as UseG1GC, " 1818 "UseCompressedOops and UseCompressedClassPointers are required." 1819 "Current settings: UseG1GC=%s, UseCompressedOops=%s, UseCompressedClassPointers=%s.", 1820 BOOL_TO_STR(UseG1GC), BOOL_TO_STR(UseCompressedOops), 1821 BOOL_TO_STR(UseCompressedClassPointers)); 1822 } 1823 return; 1824 } 1825 1826 { 1827 NoSafepointVerifier nsv; 1828 1829 // Cache for recording where the archived objects are copied to 1830 MetaspaceShared::create_archive_object_cache(); 1831 1832 tty->print_cr("Dumping objects to closed archive heap region ..."); 1833 NOT_PRODUCT(StringTable::verify()); 1834 // The closed space has maximum two regions. See FileMapInfo::write_archive_heap_regions() for details. 1835 _closed_archive_heap_regions = new GrowableArray<MemRegion>(2); 1836 MetaspaceShared::dump_closed_archive_heap_objects(_closed_archive_heap_regions); 1837 1838 tty->print_cr("Dumping objects to open archive heap region ..."); 1839 _open_archive_heap_regions = new GrowableArray<MemRegion>(2); 1840 MetaspaceShared::dump_open_archive_heap_objects(_open_archive_heap_regions); 1841 1842 MetaspaceShared::destroy_archive_object_cache(); 1843 } 1844 1845 G1HeapVerifier::verify_archive_regions(); 1846 } 1847 1848 void MetaspaceShared::dump_closed_archive_heap_objects( 1849 GrowableArray<MemRegion> * closed_archive) { 1850 assert(is_heap_object_archiving_allowed(), "Cannot dump java heap objects"); 1851 1852 Thread* THREAD = Thread::current(); 1853 G1CollectedHeap::heap()->begin_archive_alloc_range(); 1854 1855 // Archive interned string objects 1856 StringTable::write_to_archive(); 1857 1858 G1CollectedHeap::heap()->end_archive_alloc_range(closed_archive, 1859 os::vm_allocation_granularity()); 1860 } 1861 1862 void MetaspaceShared::dump_open_archive_heap_objects( 1863 GrowableArray<MemRegion> * open_archive) { 1864 assert(UseG1GC, "Only support G1 GC"); 1865 assert(UseCompressedOops && UseCompressedClassPointers, 1866 "Only support UseCompressedOops and UseCompressedClassPointers enabled"); 1867 1868 Thread* THREAD = Thread::current(); 1869 G1CollectedHeap::heap()->begin_archive_alloc_range(true /* open */); 1870 1871 java_lang_Class::archive_basic_type_mirrors(THREAD); 1872 1873 MetaspaceShared::archive_klass_objects(THREAD); 1874 1875 HeapShared::archive_module_graph_objects(THREAD); 1876 1877 G1CollectedHeap::heap()->end_archive_alloc_range(open_archive, 1878 os::vm_allocation_granularity()); 1879 } 1880 1881 unsigned MetaspaceShared::obj_hash(oop const& p) { 1882 assert(!p->mark()->has_bias_pattern(), 1883 "this object should never have been locked"); // so identity_hash won't safepoin 1884 unsigned hash = (unsigned)p->identity_hash(); 1885 return hash; 1886 } 1887 1888 MetaspaceShared::ArchivedObjectCache* MetaspaceShared::_archive_object_cache = NULL; 1889 oop MetaspaceShared::find_archived_heap_object(oop obj) { 1890 assert(DumpSharedSpaces, "dump-time only"); 1891 ArchivedObjectCache* cache = MetaspaceShared::archive_object_cache(); 1892 oop* p = cache->get(obj); 1893 if (p != NULL) { 1894 return *p; 1895 } else { 1896 return NULL; 1897 } 1898 } 1899 1900 oop MetaspaceShared::archive_heap_object(oop obj, Thread* THREAD) { 1901 assert(DumpSharedSpaces, "dump-time only"); 1902 1903 oop ao = find_archived_heap_object(obj); 1904 if (ao != NULL) { 1905 // already archived 1906 return ao; 1907 } 1908 1909 int len = obj->size(); 1910 if (G1CollectedHeap::heap()->is_archive_alloc_too_large(len)) { 1911 return NULL; 1912 } 1913 1914 int hash = obj->identity_hash(); 1915 oop archived_oop = (oop)G1CollectedHeap::heap()->archive_mem_allocate(len); 1916 if (archived_oop != NULL) { 1917 Copy::aligned_disjoint_words((HeapWord*)obj, (HeapWord*)archived_oop, len); 1918 relocate_klass_ptr(archived_oop); 1919 ArchivedObjectCache* cache = MetaspaceShared::archive_object_cache(); 1920 cache->put(obj, archived_oop); 1921 } 1922 log_debug(cds, heap)("Archived heap object " PTR_FORMAT " ==> " PTR_FORMAT, 1923 p2i(obj), p2i(archived_oop)); 1924 return archived_oop; 1925 } 1926 1927 oop MetaspaceShared::materialize_archived_object(oop obj) { 1928 if (obj != NULL) { 1929 return G1CollectedHeap::heap()->materialize_archived_object(obj); 1930 } 1931 return NULL; 1932 } 1933 1934 void MetaspaceShared::archive_klass_objects(Thread* THREAD) { 1935 int i; 1936 for (i = 0; i < _global_klass_objects->length(); i++) { 1937 Klass* k = _global_klass_objects->at(i); 1938 1939 // archive mirror object 1940 java_lang_Class::archive_mirror(k, CHECK); 1941 1942 // archive the resolved_referenes array 1943 if (k->is_instance_klass()) { 1944 InstanceKlass* ik = InstanceKlass::cast(k); 1945 ik->constants()->archive_resolved_references(THREAD); 1946 } 1947 } 1948 } 1949 1950 bool MetaspaceShared::is_archive_object(oop p) { 1951 return (p == NULL) ? false : G1ArchiveAllocator::is_archive_object(p); 1952 } 1953 1954 void MetaspaceShared::fixup_mapped_heap_regions() { 1955 FileMapInfo *mapinfo = FileMapInfo::current_info(); 1956 mapinfo->fixup_mapped_heap_regions(); 1957 } 1958 #endif // INCLUDE_CDS_JAVA_HEAP 1959 1960 // Closure for serializing initialization data in from a data area 1961 // (ptr_array) read from the shared file. 1962 1963 class ReadClosure : public SerializeClosure { 1964 private: 1965 intptr_t** _ptr_array; 1966 1967 inline intptr_t nextPtr() { 1968 return *(*_ptr_array)++; 1969 } 1970 1971 public: 1972 ReadClosure(intptr_t** ptr_array) { _ptr_array = ptr_array; } 1973 1974 void do_ptr(void** p) { 1975 assert(*p == NULL, "initializing previous initialized pointer."); 1976 intptr_t obj = nextPtr(); 1977 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100, 1978 "hit tag while initializing ptrs."); 1979 *p = (void*)obj; 1980 } 1981 1982 void do_u4(u4* p) { 1983 intptr_t obj = nextPtr(); 1984 *p = (u4)(uintx(obj)); 1985 } 1986 1987 void do_tag(int tag) { 1988 int old_tag; 1989 old_tag = (int)(intptr_t)nextPtr(); 1990 // do_int(&old_tag); 1991 assert(tag == old_tag, "old tag doesn't match"); 1992 FileMapInfo::assert_mark(tag == old_tag); 1993 } 1994 1995 void do_oop(oop *p) { 1996 narrowOop o = (narrowOop)nextPtr(); 1997 if (o == 0 || !MetaspaceShared::open_archive_heap_region_mapped()) { 1998 p = NULL; 1999 } else { 2000 assert(MetaspaceShared::is_heap_object_archiving_allowed(), 2001 "Archived heap object is not allowed"); 2002 assert(MetaspaceShared::open_archive_heap_region_mapped(), 2003 "Open archive heap region is not mapped"); 2004 *p = CompressedOops::decode_not_null(o); 2005 } 2006 } 2007 2008 void do_region(u_char* start, size_t size) { 2009 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment"); 2010 assert(size % sizeof(intptr_t) == 0, "bad size"); 2011 do_tag((int)size); 2012 while (size > 0) { 2013 *(intptr_t*)start = nextPtr(); 2014 start += sizeof(intptr_t); 2015 size -= sizeof(intptr_t); 2016 } 2017 } 2018 2019 bool reading() const { return true; } 2020 }; 2021 2022 // Return true if given address is in the misc data region 2023 bool MetaspaceShared::is_in_shared_region(const void* p, int idx) { 2024 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_region(p, idx); 2025 } 2026 2027 bool MetaspaceShared::is_in_trampoline_frame(address addr) { 2028 if (UseSharedSpaces && is_in_shared_region(addr, MetaspaceShared::mc)) { 2029 return true; 2030 } 2031 return false; 2032 } 2033 2034 void MetaspaceShared::print_shared_spaces() { 2035 if (UseSharedSpaces) { 2036 FileMapInfo::current_info()->print_shared_spaces(); 2037 } 2038 } 2039 2040 2041 // Map shared spaces at requested addresses and return if succeeded. 2042 bool MetaspaceShared::map_shared_spaces(FileMapInfo* mapinfo) { 2043 size_t image_alignment = mapinfo->alignment(); 2044 2045 #ifndef _WINDOWS 2046 // Map in the shared memory and then map the regions on top of it. 2047 // On Windows, don't map the memory here because it will cause the 2048 // mappings of the regions to fail. 2049 ReservedSpace shared_rs = mapinfo->reserve_shared_memory(); 2050 if (!shared_rs.is_reserved()) return false; 2051 #endif 2052 2053 assert(!DumpSharedSpaces, "Should not be called with DumpSharedSpaces"); 2054 2055 char* ro_base = NULL; char* ro_top; 2056 char* rw_base = NULL; char* rw_top; 2057 char* mc_base = NULL; char* mc_top; 2058 char* md_base = NULL; char* md_top; 2059 char* od_base = NULL; char* od_top; 2060 2061 // Map each shared region 2062 if ((mc_base = mapinfo->map_region(mc, &mc_top)) != NULL && 2063 (rw_base = mapinfo->map_region(rw, &rw_top)) != NULL && 2064 (ro_base = mapinfo->map_region(ro, &ro_top)) != NULL && 2065 (md_base = mapinfo->map_region(md, &md_top)) != NULL && 2066 (od_base = mapinfo->map_region(od, &od_top)) != NULL && 2067 (image_alignment == (size_t)os::vm_allocation_granularity()) && 2068 mapinfo->validate_shared_path_table()) { 2069 // Success -- set up MetaspaceObj::_shared_metaspace_{base,top} for 2070 // fast checking in MetaspaceShared::is_in_shared_metaspace() and 2071 // MetaspaceObj::is_shared(). 2072 // 2073 // We require that mc->rw->ro->md->od to be laid out consecutively, with no 2074 // gaps between them. That way, we can ensure that the OS won't be able to 2075 // allocate any new memory spaces inside _shared_metaspace_{base,top}, which 2076 // would mess up the simple comparision in MetaspaceShared::is_in_shared_metaspace(). 2077 assert(mc_base < ro_base && mc_base < rw_base && mc_base < md_base && mc_base < od_base, "must be"); 2078 assert(od_top > ro_top && od_top > rw_top && od_top > md_top && od_top > mc_top , "must be"); 2079 assert(mc_top == rw_base, "must be"); 2080 assert(rw_top == ro_base, "must be"); 2081 assert(ro_top == md_base, "must be"); 2082 assert(md_top == od_base, "must be"); 2083 2084 MetaspaceObj::_shared_metaspace_base = (void*)mc_base; 2085 MetaspaceObj::_shared_metaspace_top = (void*)od_top; 2086 return true; 2087 } else { 2088 // If there was a failure in mapping any of the spaces, unmap the ones 2089 // that succeeded 2090 if (ro_base != NULL) mapinfo->unmap_region(ro); 2091 if (rw_base != NULL) mapinfo->unmap_region(rw); 2092 if (mc_base != NULL) mapinfo->unmap_region(mc); 2093 if (md_base != NULL) mapinfo->unmap_region(md); 2094 if (od_base != NULL) mapinfo->unmap_region(od); 2095 #ifndef _WINDOWS 2096 // Release the entire mapped region 2097 shared_rs.release(); 2098 #endif 2099 // If -Xshare:on is specified, print out the error message and exit VM, 2100 // otherwise, set UseSharedSpaces to false and continue. 2101 if (RequireSharedSpaces || PrintSharedArchiveAndExit) { 2102 vm_exit_during_initialization("Unable to use shared archive.", "Failed map_region for using -Xshare:on."); 2103 } else { 2104 FLAG_SET_DEFAULT(UseSharedSpaces, false); 2105 } 2106 return false; 2107 } 2108 } 2109 2110 // Read the miscellaneous data from the shared file, and 2111 // serialize it out to its various destinations. 2112 2113 void MetaspaceShared::initialize_shared_spaces() { 2114 FileMapInfo *mapinfo = FileMapInfo::current_info(); 2115 _cds_i2i_entry_code_buffers = mapinfo->cds_i2i_entry_code_buffers(); 2116 _cds_i2i_entry_code_buffers_size = mapinfo->cds_i2i_entry_code_buffers_size(); 2117 _core_spaces_size = mapinfo->core_spaces_size(); 2118 char* buffer = mapinfo->misc_data_patching_start(); 2119 clone_cpp_vtables((intptr_t*)buffer); 2120 2121 // The rest of the data is now stored in the RW region 2122 buffer = mapinfo->read_only_tables_start(); 2123 int sharedDictionaryLen = *(intptr_t*)buffer; 2124 buffer += sizeof(intptr_t); 2125 int number_of_entries = *(intptr_t*)buffer; 2126 buffer += sizeof(intptr_t); 2127 SystemDictionary::set_shared_dictionary((HashtableBucket<mtClass>*)buffer, 2128 sharedDictionaryLen, 2129 number_of_entries); 2130 buffer += sharedDictionaryLen; 2131 2132 // The following data are the linked list elements 2133 // (HashtableEntry objects) for the shared dictionary table. 2134 2135 int len = *(intptr_t*)buffer; // skip over shared dictionary entries 2136 buffer += sizeof(intptr_t); 2137 buffer += len; 2138 2139 // The table of archived java heap object sub-graph infos 2140 buffer = HeapShared::read_archived_subgraph_infos(buffer); 2141 2142 // Verify various attributes of the archive, plus initialize the 2143 // shared string/symbol tables 2144 intptr_t* array = (intptr_t*)buffer; 2145 ReadClosure rc(&array); 2146 serialize(&rc); 2147 2148 // Initialize the run-time symbol table. 2149 SymbolTable::create_table(); 2150 2151 // Close the mapinfo file 2152 mapinfo->close(); 2153 2154 if (PrintSharedArchiveAndExit) { 2155 if (PrintSharedDictionary) { 2156 tty->print_cr("\nShared classes:\n"); 2157 SystemDictionary::print_shared(tty); 2158 } 2159 if (_archive_loading_failed) { 2160 tty->print_cr("archive is invalid"); 2161 vm_exit(1); 2162 } else { 2163 tty->print_cr("archive is valid"); 2164 vm_exit(0); 2165 } 2166 } 2167 } 2168 2169 // JVM/TI RedefineClasses() support: 2170 bool MetaspaceShared::remap_shared_readonly_as_readwrite() { 2171 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 2172 2173 if (UseSharedSpaces) { 2174 // remap the shared readonly space to shared readwrite, private 2175 FileMapInfo* mapinfo = FileMapInfo::current_info(); 2176 if (!mapinfo->remap_shared_readonly_as_readwrite()) { 2177 return false; 2178 } 2179 _remapped_readwrite = true; 2180 } 2181 return true; 2182 } 2183 2184 void MetaspaceShared::report_out_of_space(const char* name, size_t needed_bytes) { 2185 // This is highly unlikely to happen on 64-bits because we have reserved a 4GB space. 2186 // On 32-bit we reserve only 256MB so you could run out of space with 100,000 classes 2187 // or so. 2188 _mc_region.print_out_of_space_msg(name, needed_bytes); 2189 _rw_region.print_out_of_space_msg(name, needed_bytes); 2190 _ro_region.print_out_of_space_msg(name, needed_bytes); 2191 _md_region.print_out_of_space_msg(name, needed_bytes); 2192 _od_region.print_out_of_space_msg(name, needed_bytes); 2193 2194 vm_exit_during_initialization(err_msg("Unable to allocate from '%s' region", name), 2195 "Please reduce the number of shared classes."); 2196 }