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/classLoaderDataGraph.hpp" 28 #include "classfile/classListParser.hpp" 29 #include "classfile/classLoaderExt.hpp" 30 #include "classfile/dictionary.hpp" 31 #include "classfile/loaderConstraints.hpp" 32 #include "classfile/placeholders.hpp" 33 #include "classfile/symbolTable.hpp" 34 #include "classfile/stringTable.hpp" 35 #include "classfile/systemDictionary.hpp" 36 #include "classfile/systemDictionaryShared.hpp" 37 #include "code/codeCache.hpp" 38 #include "interpreter/bytecodeStream.hpp" 39 #include "interpreter/bytecodes.hpp" 40 #include "logging/log.hpp" 41 #include "logging/logMessage.hpp" 42 #include "memory/filemap.hpp" 43 #include "memory/heapShared.inline.hpp" 44 #include "memory/metaspace.hpp" 45 #include "memory/metaspaceClosure.hpp" 46 #include "memory/metaspaceShared.hpp" 47 #include "memory/resourceArea.hpp" 48 #include "oops/compressedOops.inline.hpp" 49 #include "oops/instanceClassLoaderKlass.hpp" 50 #include "oops/instanceMirrorKlass.hpp" 51 #include "oops/instanceRefKlass.hpp" 52 #include "oops/objArrayKlass.hpp" 53 #include "oops/objArrayOop.hpp" 54 #include "oops/oop.inline.hpp" 55 #include "oops/typeArrayKlass.hpp" 56 #include "prims/jvmtiRedefineClasses.hpp" 57 #include "runtime/handles.inline.hpp" 58 #include "runtime/os.hpp" 59 #include "runtime/safepointVerifiers.hpp" 60 #include "runtime/signature.hpp" 61 #include "runtime/timerTrace.hpp" 62 #include "runtime/vmThread.hpp" 63 #include "runtime/vm_operations.hpp" 64 #include "utilities/align.hpp" 65 #include "utilities/bitMap.hpp" 66 #include "utilities/defaultStream.hpp" 67 #include "utilities/hashtable.inline.hpp" 68 #if INCLUDE_G1GC 69 #include "gc/g1/g1CollectedHeap.hpp" 70 #endif 71 72 ReservedSpace MetaspaceShared::_shared_rs; 73 VirtualSpace MetaspaceShared::_shared_vs; 74 MetaspaceSharedStats MetaspaceShared::_stats; 75 bool MetaspaceShared::_has_error_classes; 76 bool MetaspaceShared::_archive_loading_failed = false; 77 bool MetaspaceShared::_remapped_readwrite = 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 HeapShared::archive_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->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 log_info(cds)("narrow_klass_base = " PTR_FORMAT ", narrow_klass_shift = %d", 313 p2i(Universe::narrow_klass_base()), Universe::narrow_klass_shift()); 314 315 log_info(cds)("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 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); 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/string/subgraph_info tables 422 SymbolTable::serialize_shared_table_header(soc); 423 StringTable::serialize_shared_table_header(soc); 424 HeapShared::serialize_subgraph_info_table_header(soc); 425 426 JavaClasses::serialize_offsets(soc); 427 InstanceMirrorKlass::serialize_offsets(soc); 428 soc->do_tag(--tag); 429 430 soc->do_tag(666); 431 } 432 433 address MetaspaceShared::cds_i2i_entry_code_buffers(size_t total_size) { 434 if (DumpSharedSpaces) { 435 if (_cds_i2i_entry_code_buffers == NULL) { 436 _cds_i2i_entry_code_buffers = (address)misc_code_space_alloc(total_size); 437 _cds_i2i_entry_code_buffers_size = total_size; 438 } 439 } else if (UseSharedSpaces) { 440 assert(_cds_i2i_entry_code_buffers != NULL, "must already been initialized"); 441 } else { 442 return NULL; 443 } 444 445 assert(_cds_i2i_entry_code_buffers_size == total_size, "must not change"); 446 return _cds_i2i_entry_code_buffers; 447 } 448 449 // CDS code for dumping shared archive. 450 451 // Global object for holding classes that have been loaded. Since this 452 // is run at a safepoint just before exit, this is the entire set of classes. 453 static GrowableArray<Klass*>* _global_klass_objects; 454 455 GrowableArray<Klass*>* MetaspaceShared::collected_klasses() { 456 return _global_klass_objects; 457 } 458 459 static void collect_array_classes(Klass* k) { 460 _global_klass_objects->append_if_missing(k); 461 if (k->is_array_klass()) { 462 // Add in the array classes too 463 ArrayKlass* ak = ArrayKlass::cast(k); 464 Klass* h = ak->higher_dimension(); 465 if (h != NULL) { 466 h->array_klasses_do(collect_array_classes); 467 } 468 } 469 } 470 471 class CollectClassesClosure : public KlassClosure { 472 void do_klass(Klass* k) { 473 if (!(k->is_instance_klass() && InstanceKlass::cast(k)->is_in_error_state())) { 474 if (k->is_instance_klass() && InstanceKlass::cast(k)->signers() != NULL) { 475 // Mark any class with signers and don't add to the _global_klass_objects 476 k->set_has_signer_and_not_archived(); 477 } else { 478 _global_klass_objects->append_if_missing(k); 479 } 480 } 481 if (k->is_array_klass()) { 482 // Add in the array classes too 483 ArrayKlass* ak = ArrayKlass::cast(k); 484 Klass* h = ak->higher_dimension(); 485 if (h != NULL) { 486 h->array_klasses_do(collect_array_classes); 487 } 488 } 489 } 490 }; 491 492 static void remove_unshareable_in_classes() { 493 for (int i = 0; i < _global_klass_objects->length(); i++) { 494 Klass* k = _global_klass_objects->at(i); 495 if (!k->is_objArray_klass()) { 496 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info 497 // on their array classes. 498 assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be"); 499 k->remove_unshareable_info(); 500 } 501 } 502 } 503 504 static void remove_java_mirror_in_classes() { 505 for (int i = 0; i < _global_klass_objects->length(); i++) { 506 Klass* k = _global_klass_objects->at(i); 507 if (!k->is_objArray_klass()) { 508 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info 509 // on their array classes. 510 assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be"); 511 k->remove_java_mirror(); 512 } 513 } 514 } 515 516 static void clear_basic_type_mirrors() { 517 assert(!HeapShared::is_heap_object_archiving_allowed(), "Sanity"); 518 Universe::set_int_mirror(NULL); 519 Universe::set_float_mirror(NULL); 520 Universe::set_double_mirror(NULL); 521 Universe::set_byte_mirror(NULL); 522 Universe::set_bool_mirror(NULL); 523 Universe::set_char_mirror(NULL); 524 Universe::set_long_mirror(NULL); 525 Universe::set_short_mirror(NULL); 526 Universe::set_void_mirror(NULL); 527 } 528 529 static void rewrite_nofast_bytecode(Method* method) { 530 BytecodeStream bcs(method); 531 while (!bcs.is_last_bytecode()) { 532 Bytecodes::Code opcode = bcs.next(); 533 switch (opcode) { 534 case Bytecodes::_getfield: *bcs.bcp() = Bytecodes::_nofast_getfield; break; 535 case Bytecodes::_putfield: *bcs.bcp() = Bytecodes::_nofast_putfield; break; 536 case Bytecodes::_aload_0: *bcs.bcp() = Bytecodes::_nofast_aload_0; break; 537 case Bytecodes::_iload: { 538 if (!bcs.is_wide()) { 539 *bcs.bcp() = Bytecodes::_nofast_iload; 540 } 541 break; 542 } 543 default: break; 544 } 545 } 546 } 547 548 // Walk all methods in the class list to ensure that they won't be modified at 549 // run time. This includes: 550 // [1] Rewrite all bytecodes as needed, so that the ConstMethod* will not be modified 551 // at run time by RewriteBytecodes/RewriteFrequentPairs 552 // [2] Assign a fingerprint, so one doesn't need to be assigned at run-time. 553 static void rewrite_nofast_bytecodes_and_calculate_fingerprints() { 554 for (int i = 0; i < _global_klass_objects->length(); i++) { 555 Klass* k = _global_klass_objects->at(i); 556 if (k->is_instance_klass()) { 557 InstanceKlass* ik = InstanceKlass::cast(k); 558 for (int i = 0; i < ik->methods()->length(); i++) { 559 Method* m = ik->methods()->at(i); 560 rewrite_nofast_bytecode(m); 561 Fingerprinter fp(m); 562 // The side effect of this call sets method's fingerprint field. 563 fp.fingerprint(); 564 } 565 } 566 } 567 } 568 569 static void relocate_cached_class_file() { 570 for (int i = 0; i < _global_klass_objects->length(); i++) { 571 Klass* k = _global_klass_objects->at(i); 572 if (k->is_instance_klass()) { 573 InstanceKlass* ik = InstanceKlass::cast(k); 574 JvmtiCachedClassFileData* p = ik->get_archived_class_data(); 575 if (p != NULL) { 576 int size = offset_of(JvmtiCachedClassFileData, data) + p->length; 577 JvmtiCachedClassFileData* q = (JvmtiCachedClassFileData*)_od_region.allocate(size); 578 q->length = p->length; 579 memcpy(q->data, p->data, p->length); 580 ik->set_archived_class_data(q); 581 } 582 } 583 } 584 } 585 586 NOT_PRODUCT( 587 static void assert_not_unsafe_anonymous_class(InstanceKlass* k) { 588 assert(!(k->is_unsafe_anonymous()), "cannot archive unsafe anonymous classes"); 589 } 590 591 // Unsafe anonymous classes are not stored inside any dictionaries. 592 static void assert_no_unsafe_anonymous_classes_in_dictionaries() { 593 ClassLoaderDataGraph::dictionary_classes_do(assert_not_unsafe_anonymous_class); 594 }) 595 596 // Objects of the Metadata types (such as Klass and ConstantPool) have C++ vtables. 597 // (In GCC this is the field <Type>::_vptr, i.e., first word in the object.) 598 // 599 // Addresses of the vtables and the methods may be different across JVM runs, 600 // if libjvm.so is dynamically loaded at a different base address. 601 // 602 // To ensure that the Metadata objects in the CDS archive always have the correct vtable: 603 // 604 // + at dump time: we redirect the _vptr to point to our own vtables inside 605 // the CDS image 606 // + at run time: we clone the actual contents of the vtables from libjvm.so 607 // into our own tables. 608 609 // Currently, the archive contain ONLY the following types of objects that have C++ vtables. 610 #define CPP_VTABLE_PATCH_TYPES_DO(f) \ 611 f(ConstantPool) \ 612 f(InstanceKlass) \ 613 f(InstanceClassLoaderKlass) \ 614 f(InstanceMirrorKlass) \ 615 f(InstanceRefKlass) \ 616 f(Method) \ 617 f(ObjArrayKlass) \ 618 f(TypeArrayKlass) 619 620 class CppVtableInfo { 621 intptr_t _vtable_size; 622 intptr_t _cloned_vtable[1]; 623 public: 624 static int num_slots(int vtable_size) { 625 return 1 + vtable_size; // Need to add the space occupied by _vtable_size; 626 } 627 int vtable_size() { return int(uintx(_vtable_size)); } 628 void set_vtable_size(int n) { _vtable_size = intptr_t(n); } 629 intptr_t* cloned_vtable() { return &_cloned_vtable[0]; } 630 void zero() { memset(_cloned_vtable, 0, sizeof(intptr_t) * vtable_size()); } 631 // Returns the address of the next CppVtableInfo that can be placed immediately after this CppVtableInfo 632 static size_t byte_size(int vtable_size) { 633 CppVtableInfo i; 634 return pointer_delta(&i._cloned_vtable[vtable_size], &i, sizeof(u1)); 635 } 636 }; 637 638 template <class T> class CppVtableCloner : public T { 639 static intptr_t* vtable_of(Metadata& m) { 640 return *((intptr_t**)&m); 641 } 642 static CppVtableInfo* _info; 643 644 static int get_vtable_length(const char* name); 645 646 public: 647 // Allocate and initialize the C++ vtable, starting from top, but do not go past end. 648 static intptr_t* allocate(const char* name); 649 650 // Clone the vtable to ... 651 static intptr_t* clone_vtable(const char* name, CppVtableInfo* info); 652 653 static void zero_vtable_clone() { 654 assert(DumpSharedSpaces, "dump-time only"); 655 _info->zero(); 656 } 657 658 // Switch the vtable pointer to point to the cloned vtable. 659 static void patch(Metadata* obj) { 660 assert(DumpSharedSpaces, "dump-time only"); 661 *(void**)obj = (void*)(_info->cloned_vtable()); 662 } 663 664 static bool is_valid_shared_object(const T* obj) { 665 intptr_t* vptr = *(intptr_t**)obj; 666 return vptr == _info->cloned_vtable(); 667 } 668 }; 669 670 template <class T> CppVtableInfo* CppVtableCloner<T>::_info = NULL; 671 672 template <class T> 673 intptr_t* CppVtableCloner<T>::allocate(const char* name) { 674 assert(is_aligned(_md_region.top(), sizeof(intptr_t)), "bad alignment"); 675 int n = get_vtable_length(name); 676 _info = (CppVtableInfo*)_md_region.allocate(CppVtableInfo::byte_size(n), sizeof(intptr_t)); 677 _info->set_vtable_size(n); 678 679 intptr_t* p = clone_vtable(name, _info); 680 assert((char*)p == _md_region.top(), "must be"); 681 682 return p; 683 } 684 685 template <class T> 686 intptr_t* CppVtableCloner<T>::clone_vtable(const char* name, CppVtableInfo* info) { 687 if (!DumpSharedSpaces) { 688 assert(_info == 0, "_info is initialized only at dump time"); 689 _info = info; // Remember it -- it will be used by MetaspaceShared::is_valid_shared_method() 690 } 691 T tmp; // Allocate temporary dummy metadata object to get to the original vtable. 692 int n = info->vtable_size(); 693 intptr_t* srcvtable = vtable_of(tmp); 694 intptr_t* dstvtable = info->cloned_vtable(); 695 696 // We already checked (and, if necessary, adjusted n) when the vtables were allocated, so we are 697 // safe to do memcpy. 698 log_debug(cds, vtables)("Copying %3d vtable entries for %s", n, name); 699 memcpy(dstvtable, srcvtable, sizeof(intptr_t) * n); 700 return dstvtable + n; 701 } 702 703 // To determine the size of the vtable for each type, we use the following 704 // trick by declaring 2 subclasses: 705 // 706 // class CppVtableTesterA: public InstanceKlass {virtual int last_virtual_method() {return 1;} }; 707 // class CppVtableTesterB: public InstanceKlass {virtual void* last_virtual_method() {return NULL}; }; 708 // 709 // CppVtableTesterA and CppVtableTesterB's vtables have the following properties: 710 // - Their size (N+1) is exactly one more than the size of InstanceKlass's vtable (N) 711 // - The first N entries have are exactly the same as in InstanceKlass's vtable. 712 // - Their last entry is different. 713 // 714 // So to determine the value of N, we just walk CppVtableTesterA and CppVtableTesterB's tables 715 // and find the first entry that's different. 716 // 717 // This works on all C++ compilers supported by Oracle, but you may need to tweak it for more 718 // esoteric compilers. 719 720 template <class T> class CppVtableTesterB: public T { 721 public: 722 virtual int last_virtual_method() {return 1;} 723 }; 724 725 template <class T> class CppVtableTesterA : public T { 726 public: 727 virtual void* last_virtual_method() { 728 // Make this different than CppVtableTesterB::last_virtual_method so the C++ 729 // compiler/linker won't alias the two functions. 730 return NULL; 731 } 732 }; 733 734 template <class T> 735 int CppVtableCloner<T>::get_vtable_length(const char* name) { 736 CppVtableTesterA<T> a; 737 CppVtableTesterB<T> b; 738 739 intptr_t* avtable = vtable_of(a); 740 intptr_t* bvtable = vtable_of(b); 741 742 // Start at slot 1, because slot 0 may be RTTI (on Solaris/Sparc) 743 int vtable_len = 1; 744 for (; ; vtable_len++) { 745 if (avtable[vtable_len] != bvtable[vtable_len]) { 746 break; 747 } 748 } 749 log_debug(cds, vtables)("Found %3d vtable entries for %s", vtable_len, name); 750 751 return vtable_len; 752 } 753 754 #define ALLOC_CPP_VTABLE_CLONE(c) \ 755 CppVtableCloner<c>::allocate(#c); 756 757 #define CLONE_CPP_VTABLE(c) \ 758 p = CppVtableCloner<c>::clone_vtable(#c, (CppVtableInfo*)p); 759 760 #define ZERO_CPP_VTABLE(c) \ 761 CppVtableCloner<c>::zero_vtable_clone(); 762 763 // This can be called at both dump time and run time. 764 intptr_t* MetaspaceShared::clone_cpp_vtables(intptr_t* p) { 765 assert(DumpSharedSpaces || UseSharedSpaces, "sanity"); 766 CPP_VTABLE_PATCH_TYPES_DO(CLONE_CPP_VTABLE); 767 return p; 768 } 769 770 void MetaspaceShared::zero_cpp_vtable_clones_for_writing() { 771 assert(DumpSharedSpaces, "dump-time only"); 772 CPP_VTABLE_PATCH_TYPES_DO(ZERO_CPP_VTABLE); 773 } 774 775 // Allocate and initialize the C++ vtables, starting from top, but do not go past end. 776 void MetaspaceShared::allocate_cpp_vtable_clones() { 777 assert(DumpSharedSpaces, "dump-time only"); 778 // Layout (each slot is a intptr_t): 779 // [number of slots in the first vtable = n1] 780 // [ <n1> slots for the first vtable] 781 // [number of slots in the first second = n2] 782 // [ <n2> slots for the second vtable] 783 // ... 784 // The order of the vtables is the same as the CPP_VTAB_PATCH_TYPES_DO macro. 785 CPP_VTABLE_PATCH_TYPES_DO(ALLOC_CPP_VTABLE_CLONE); 786 } 787 788 // Switch the vtable pointer to point to the cloned vtable. We assume the 789 // vtable pointer is in first slot in object. 790 void MetaspaceShared::patch_cpp_vtable_pointers() { 791 int n = _global_klass_objects->length(); 792 for (int i = 0; i < n; i++) { 793 Klass* obj = _global_klass_objects->at(i); 794 if (obj->is_instance_klass()) { 795 InstanceKlass* ik = InstanceKlass::cast(obj); 796 if (ik->is_class_loader_instance_klass()) { 797 CppVtableCloner<InstanceClassLoaderKlass>::patch(ik); 798 } else if (ik->is_reference_instance_klass()) { 799 CppVtableCloner<InstanceRefKlass>::patch(ik); 800 } else if (ik->is_mirror_instance_klass()) { 801 CppVtableCloner<InstanceMirrorKlass>::patch(ik); 802 } else { 803 CppVtableCloner<InstanceKlass>::patch(ik); 804 } 805 ConstantPool* cp = ik->constants(); 806 CppVtableCloner<ConstantPool>::patch(cp); 807 for (int j = 0; j < ik->methods()->length(); j++) { 808 Method* m = ik->methods()->at(j); 809 CppVtableCloner<Method>::patch(m); 810 assert(CppVtableCloner<Method>::is_valid_shared_object(m), "must be"); 811 } 812 } else if (obj->is_objArray_klass()) { 813 CppVtableCloner<ObjArrayKlass>::patch(obj); 814 } else { 815 assert(obj->is_typeArray_klass(), "sanity"); 816 CppVtableCloner<TypeArrayKlass>::patch(obj); 817 } 818 } 819 } 820 821 bool MetaspaceShared::is_valid_shared_method(const Method* m) { 822 assert(is_in_shared_metaspace(m), "must be"); 823 return CppVtableCloner<Method>::is_valid_shared_object(m); 824 } 825 826 // Closure for serializing initialization data out to a data area to be 827 // written to the shared file. 828 829 class WriteClosure : public SerializeClosure { 830 private: 831 DumpRegion* _dump_region; 832 833 public: 834 WriteClosure(DumpRegion* r) { 835 _dump_region = r; 836 } 837 838 void do_ptr(void** p) { 839 _dump_region->append_intptr_t((intptr_t)*p); 840 } 841 842 void do_u4(u4* p) { 843 void* ptr = (void*)(uintx(*p)); 844 do_ptr(&ptr); 845 } 846 847 void do_tag(int tag) { 848 _dump_region->append_intptr_t((intptr_t)tag); 849 } 850 851 void do_oop(oop* o) { 852 if (*o == NULL) { 853 _dump_region->append_intptr_t(0); 854 } else { 855 assert(HeapShared::is_heap_object_archiving_allowed(), 856 "Archiving heap object is not allowed"); 857 _dump_region->append_intptr_t( 858 (intptr_t)CompressedOops::encode_not_null(*o)); 859 } 860 } 861 862 void do_region(u_char* start, size_t size) { 863 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment"); 864 assert(size % sizeof(intptr_t) == 0, "bad size"); 865 do_tag((int)size); 866 while (size > 0) { 867 _dump_region->append_intptr_t(*(intptr_t*)start); 868 start += sizeof(intptr_t); 869 size -= sizeof(intptr_t); 870 } 871 } 872 873 bool reading() const { return false; } 874 }; 875 876 // This is for dumping detailed statistics for the allocations 877 // in the shared spaces. 878 class DumpAllocStats : public ResourceObj { 879 public: 880 881 // Here's poor man's enum inheritance 882 #define SHAREDSPACE_OBJ_TYPES_DO(f) \ 883 METASPACE_OBJ_TYPES_DO(f) \ 884 f(SymbolHashentry) \ 885 f(SymbolBucket) \ 886 f(StringHashentry) \ 887 f(StringBucket) \ 888 f(Other) 889 890 enum Type { 891 // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc 892 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_DECLARE) 893 _number_of_types 894 }; 895 896 static const char * type_name(Type type) { 897 switch(type) { 898 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_NAME_CASE) 899 default: 900 ShouldNotReachHere(); 901 return NULL; 902 } 903 } 904 905 public: 906 enum { RO = 0, RW = 1 }; 907 908 int _counts[2][_number_of_types]; 909 int _bytes [2][_number_of_types]; 910 911 DumpAllocStats() { 912 memset(_counts, 0, sizeof(_counts)); 913 memset(_bytes, 0, sizeof(_bytes)); 914 }; 915 916 void record(MetaspaceObj::Type type, int byte_size, bool read_only) { 917 assert(int(type) >= 0 && type < MetaspaceObj::_number_of_types, "sanity"); 918 int which = (read_only) ? RO : RW; 919 _counts[which][type] ++; 920 _bytes [which][type] += byte_size; 921 } 922 923 void record_other_type(int byte_size, bool read_only) { 924 int which = (read_only) ? RO : RW; 925 _bytes [which][OtherType] += byte_size; 926 } 927 void print_stats(int ro_all, int rw_all, int mc_all, int md_all); 928 }; 929 930 void DumpAllocStats::print_stats(int ro_all, int rw_all, int mc_all, int md_all) { 931 // Calculate size of data that was not allocated by Metaspace::allocate() 932 MetaspaceSharedStats *stats = MetaspaceShared::stats(); 933 934 // symbols 935 _counts[RO][SymbolHashentryType] = stats->symbol.hashentry_count; 936 _bytes [RO][SymbolHashentryType] = stats->symbol.hashentry_bytes; 937 938 _counts[RO][SymbolBucketType] = stats->symbol.bucket_count; 939 _bytes [RO][SymbolBucketType] = stats->symbol.bucket_bytes; 940 941 // strings 942 _counts[RO][StringHashentryType] = stats->string.hashentry_count; 943 _bytes [RO][StringHashentryType] = stats->string.hashentry_bytes; 944 945 _counts[RO][StringBucketType] = stats->string.bucket_count; 946 _bytes [RO][StringBucketType] = stats->string.bucket_bytes; 947 948 // TODO: count things like dictionary, vtable, etc 949 _bytes[RW][OtherType] += mc_all + md_all; 950 rw_all += mc_all + md_all; // mc/md are mapped Read/Write 951 952 // prevent divide-by-zero 953 if (ro_all < 1) { 954 ro_all = 1; 955 } 956 if (rw_all < 1) { 957 rw_all = 1; 958 } 959 960 int all_ro_count = 0; 961 int all_ro_bytes = 0; 962 int all_rw_count = 0; 963 int all_rw_bytes = 0; 964 965 // To make fmt_stats be a syntactic constant (for format warnings), use #define. 966 #define fmt_stats "%-20s: %8d %10d %5.1f | %8d %10d %5.1f | %8d %10d %5.1f" 967 const char *sep = "--------------------+---------------------------+---------------------------+--------------------------"; 968 const char *hdr = " ro_cnt ro_bytes % | rw_cnt rw_bytes % | all_cnt all_bytes %"; 969 970 LogMessage(cds) msg; 971 972 msg.info("Detailed metadata info (excluding od/st regions; rw stats include md/mc regions):"); 973 msg.info("%s", hdr); 974 msg.info("%s", sep); 975 for (int type = 0; type < int(_number_of_types); type ++) { 976 const char *name = type_name((Type)type); 977 int ro_count = _counts[RO][type]; 978 int ro_bytes = _bytes [RO][type]; 979 int rw_count = _counts[RW][type]; 980 int rw_bytes = _bytes [RW][type]; 981 int count = ro_count + rw_count; 982 int bytes = ro_bytes + rw_bytes; 983 984 double ro_perc = percent_of(ro_bytes, ro_all); 985 double rw_perc = percent_of(rw_bytes, rw_all); 986 double perc = percent_of(bytes, ro_all + rw_all); 987 988 msg.info(fmt_stats, name, 989 ro_count, ro_bytes, ro_perc, 990 rw_count, rw_bytes, rw_perc, 991 count, bytes, perc); 992 993 all_ro_count += ro_count; 994 all_ro_bytes += ro_bytes; 995 all_rw_count += rw_count; 996 all_rw_bytes += rw_bytes; 997 } 998 999 int all_count = all_ro_count + all_rw_count; 1000 int all_bytes = all_ro_bytes + all_rw_bytes; 1001 1002 double all_ro_perc = percent_of(all_ro_bytes, ro_all); 1003 double all_rw_perc = percent_of(all_rw_bytes, rw_all); 1004 double all_perc = percent_of(all_bytes, ro_all + rw_all); 1005 1006 msg.info("%s", sep); 1007 msg.info(fmt_stats, "Total", 1008 all_ro_count, all_ro_bytes, all_ro_perc, 1009 all_rw_count, all_rw_bytes, all_rw_perc, 1010 all_count, all_bytes, all_perc); 1011 1012 assert(all_ro_bytes == ro_all, "everything should have been counted"); 1013 assert(all_rw_bytes == rw_all, "everything should have been counted"); 1014 1015 #undef fmt_stats 1016 } 1017 1018 // Populate the shared space. 1019 1020 class VM_PopulateDumpSharedSpace: public VM_Operation { 1021 private: 1022 GrowableArray<MemRegion> *_closed_archive_heap_regions; 1023 GrowableArray<MemRegion> *_open_archive_heap_regions; 1024 1025 GrowableArray<ArchiveHeapOopmapInfo> *_closed_archive_heap_oopmaps; 1026 GrowableArray<ArchiveHeapOopmapInfo> *_open_archive_heap_oopmaps; 1027 1028 void dump_java_heap_objects() NOT_CDS_JAVA_HEAP_RETURN; 1029 void dump_archive_heap_oopmaps() NOT_CDS_JAVA_HEAP_RETURN; 1030 void dump_archive_heap_oopmaps(GrowableArray<MemRegion>* regions, 1031 GrowableArray<ArchiveHeapOopmapInfo>* oopmaps); 1032 void dump_symbols(); 1033 char* dump_read_only_tables(); 1034 void print_region_stats(); 1035 void print_heap_region_stats(GrowableArray<MemRegion> *heap_mem, 1036 const char *name, const size_t total_size); 1037 public: 1038 1039 VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; } 1040 void doit(); // outline because gdb sucks 1041 static void write_region(FileMapInfo* mapinfo, int region, DumpRegion* space, bool read_only, bool allow_exec); 1042 bool allow_nested_vm_operations() const { return true; } 1043 }; // class VM_PopulateDumpSharedSpace 1044 1045 class SortedSymbolClosure: public SymbolClosure { 1046 GrowableArray<Symbol*> _symbols; 1047 virtual void do_symbol(Symbol** sym) { 1048 assert((*sym)->is_permanent(), "archived symbols must be permanent"); 1049 _symbols.append(*sym); 1050 } 1051 static int compare_symbols_by_address(Symbol** a, Symbol** b) { 1052 if (a[0] < b[0]) { 1053 return -1; 1054 } else if (a[0] == b[0]) { 1055 return 0; 1056 } else { 1057 return 1; 1058 } 1059 } 1060 1061 public: 1062 SortedSymbolClosure() { 1063 SymbolTable::symbols_do(this); 1064 _symbols.sort(compare_symbols_by_address); 1065 } 1066 GrowableArray<Symbol*>* get_sorted_symbols() { 1067 return &_symbols; 1068 } 1069 }; 1070 1071 // ArchiveCompactor -- 1072 // 1073 // This class is the central piece of shared archive compaction -- all metaspace data are 1074 // initially allocated outside of the shared regions. ArchiveCompactor copies the 1075 // metaspace data into their final location in the shared regions. 1076 1077 class ArchiveCompactor : AllStatic { 1078 static DumpAllocStats* _alloc_stats; 1079 static SortedSymbolClosure* _ssc; 1080 1081 static unsigned my_hash(const address& a) { 1082 return primitive_hash<address>(a); 1083 } 1084 static bool my_equals(const address& a0, const address& a1) { 1085 return primitive_equals<address>(a0, a1); 1086 } 1087 typedef ResourceHashtable< 1088 address, address, 1089 ArchiveCompactor::my_hash, // solaris compiler doesn't like: primitive_hash<address> 1090 ArchiveCompactor::my_equals, // solaris compiler doesn't like: primitive_equals<address> 1091 16384, ResourceObj::C_HEAP> RelocationTable; 1092 static RelocationTable* _new_loc_table; 1093 1094 public: 1095 static void initialize() { 1096 _alloc_stats = new(ResourceObj::C_HEAP, mtInternal)DumpAllocStats; 1097 _new_loc_table = new(ResourceObj::C_HEAP, mtInternal)RelocationTable; 1098 } 1099 static DumpAllocStats* alloc_stats() { 1100 return _alloc_stats; 1101 } 1102 1103 // Use this when you allocate space with MetaspaceShare::read_only_space_alloc() 1104 // outside of ArchiveCompactor::allocate(). These are usually for misc tables 1105 // that are allocated in the RO space. 1106 class OtherROAllocMark { 1107 char* _oldtop; 1108 public: 1109 OtherROAllocMark() { 1110 _oldtop = _ro_region.top(); 1111 } 1112 ~OtherROAllocMark() { 1113 char* newtop = _ro_region.top(); 1114 ArchiveCompactor::alloc_stats()->record_other_type(int(newtop - _oldtop), true); 1115 } 1116 }; 1117 1118 static void allocate(MetaspaceClosure::Ref* ref, bool read_only) { 1119 address obj = ref->obj(); 1120 int bytes = ref->size() * BytesPerWord; 1121 char* p; 1122 size_t alignment = BytesPerWord; 1123 char* oldtop; 1124 char* newtop; 1125 1126 if (read_only) { 1127 oldtop = _ro_region.top(); 1128 p = _ro_region.allocate(bytes, alignment); 1129 newtop = _ro_region.top(); 1130 } else { 1131 oldtop = _rw_region.top(); 1132 p = _rw_region.allocate(bytes, alignment); 1133 newtop = _rw_region.top(); 1134 } 1135 memcpy(p, obj, bytes); 1136 bool isnew = _new_loc_table->put(obj, (address)p); 1137 log_trace(cds)("Copy: " PTR_FORMAT " ==> " PTR_FORMAT " %d", p2i(obj), p2i(p), bytes); 1138 assert(isnew, "must be"); 1139 1140 _alloc_stats->record(ref->msotype(), int(newtop - oldtop), read_only); 1141 if (ref->msotype() == MetaspaceObj::SymbolType) { 1142 uintx delta = MetaspaceShared::object_delta(p); 1143 if (delta > MAX_SHARED_DELTA) { 1144 // This is just a sanity check and should not appear in any real world usage. This 1145 // happens only if you allocate more than 2GB of Symbols and would require 1146 // millions of shared classes. 1147 vm_exit_during_initialization("Too many Symbols in the CDS archive", 1148 "Please reduce the number of shared classes."); 1149 } 1150 } 1151 } 1152 1153 static address get_new_loc(MetaspaceClosure::Ref* ref) { 1154 address* pp = _new_loc_table->get(ref->obj()); 1155 assert(pp != NULL, "must be"); 1156 return *pp; 1157 } 1158 1159 private: 1160 // Makes a shallow copy of visited MetaspaceObj's 1161 class ShallowCopier: public UniqueMetaspaceClosure { 1162 bool _read_only; 1163 public: 1164 ShallowCopier(bool read_only) : _read_only(read_only) {} 1165 1166 virtual void do_unique_ref(Ref* ref, bool read_only) { 1167 if (read_only == _read_only) { 1168 allocate(ref, read_only); 1169 } 1170 } 1171 }; 1172 1173 // Relocate embedded pointers within a MetaspaceObj's shallow copy 1174 class ShallowCopyEmbeddedRefRelocator: public UniqueMetaspaceClosure { 1175 public: 1176 virtual void do_unique_ref(Ref* ref, bool read_only) { 1177 address new_loc = get_new_loc(ref); 1178 RefRelocator refer; 1179 ref->metaspace_pointers_do_at(&refer, new_loc); 1180 } 1181 }; 1182 1183 // Relocate a reference to point to its shallow copy 1184 class RefRelocator: public MetaspaceClosure { 1185 public: 1186 virtual bool do_ref(Ref* ref, bool read_only) { 1187 if (ref->not_null()) { 1188 ref->update(get_new_loc(ref)); 1189 } 1190 return false; // Do not recurse. 1191 } 1192 }; 1193 1194 #ifdef ASSERT 1195 class IsRefInArchiveChecker: public MetaspaceClosure { 1196 public: 1197 virtual bool do_ref(Ref* ref, bool read_only) { 1198 if (ref->not_null()) { 1199 char* obj = (char*)ref->obj(); 1200 assert(_ro_region.contains(obj) || _rw_region.contains(obj), 1201 "must be relocated to point to CDS archive"); 1202 } 1203 return false; // Do not recurse. 1204 } 1205 }; 1206 #endif 1207 1208 public: 1209 static void copy_and_compact() { 1210 // We should no longer allocate anything from the metaspace, so that 1211 // we can have a stable set of MetaspaceObjs to work with. 1212 Metaspace::freeze(); 1213 1214 ResourceMark rm; 1215 SortedSymbolClosure the_ssc; // StackObj 1216 _ssc = &the_ssc; 1217 1218 tty->print_cr("Scanning all metaspace objects ... "); 1219 { 1220 // allocate and shallow-copy RW objects, immediately following the MC region 1221 tty->print_cr("Allocating RW objects ... "); 1222 _mc_region.pack(&_rw_region); 1223 1224 ResourceMark rm; 1225 ShallowCopier rw_copier(false); 1226 iterate_roots(&rw_copier); 1227 } 1228 { 1229 // allocate and shallow-copy of RO object, immediately following the RW region 1230 tty->print_cr("Allocating RO objects ... "); 1231 _rw_region.pack(&_ro_region); 1232 1233 ResourceMark rm; 1234 ShallowCopier ro_copier(true); 1235 iterate_roots(&ro_copier); 1236 } 1237 { 1238 tty->print_cr("Relocating embedded pointers ... "); 1239 ResourceMark rm; 1240 ShallowCopyEmbeddedRefRelocator emb_reloc; 1241 iterate_roots(&emb_reloc); 1242 } 1243 { 1244 tty->print_cr("Relocating external roots ... "); 1245 ResourceMark rm; 1246 RefRelocator ext_reloc; 1247 iterate_roots(&ext_reloc); 1248 } 1249 1250 #ifdef ASSERT 1251 { 1252 tty->print_cr("Verifying external roots ... "); 1253 ResourceMark rm; 1254 IsRefInArchiveChecker checker; 1255 iterate_roots(&checker); 1256 } 1257 #endif 1258 1259 1260 // cleanup 1261 _ssc = NULL; 1262 } 1263 1264 // We must relocate the System::_well_known_klasses only after we have copied the 1265 // java objects in during dump_java_heap_objects(): during the object copy, we operate on 1266 // old objects which assert that their klass is the original klass. 1267 static void relocate_well_known_klasses() { 1268 { 1269 tty->print_cr("Relocating SystemDictionary::_well_known_klasses[] ... "); 1270 ResourceMark rm; 1271 RefRelocator ext_reloc; 1272 SystemDictionary::well_known_klasses_do(&ext_reloc); 1273 } 1274 // NOTE: after this point, we shouldn't have any globals that can reach the old 1275 // objects. 1276 1277 // We cannot use any of the objects in the heap anymore (except for the objects 1278 // in the CDS shared string regions) because their headers no longer point to 1279 // valid Klasses. 1280 } 1281 1282 static void iterate_roots(MetaspaceClosure* it) { 1283 GrowableArray<Symbol*>* symbols = _ssc->get_sorted_symbols(); 1284 for (int i=0; i<symbols->length(); i++) { 1285 it->push(symbols->adr_at(i)); 1286 } 1287 if (_global_klass_objects != NULL) { 1288 // Need to fix up the pointers 1289 for (int i = 0; i < _global_klass_objects->length(); i++) { 1290 // NOTE -- this requires that the vtable is NOT yet patched, or else we are hosed. 1291 it->push(_global_klass_objects->adr_at(i)); 1292 } 1293 } 1294 FileMapInfo::metaspace_pointers_do(it); 1295 SystemDictionary::classes_do(it); 1296 Universe::metaspace_pointers_do(it); 1297 SymbolTable::metaspace_pointers_do(it); 1298 vmSymbols::metaspace_pointers_do(it); 1299 } 1300 1301 static Klass* get_relocated_klass(Klass* orig_klass) { 1302 assert(DumpSharedSpaces, "dump time only"); 1303 address* pp = _new_loc_table->get((address)orig_klass); 1304 assert(pp != NULL, "must be"); 1305 Klass* klass = (Klass*)(*pp); 1306 assert(klass->is_klass(), "must be"); 1307 return klass; 1308 } 1309 }; 1310 1311 DumpAllocStats* ArchiveCompactor::_alloc_stats; 1312 SortedSymbolClosure* ArchiveCompactor::_ssc; 1313 ArchiveCompactor::RelocationTable* ArchiveCompactor::_new_loc_table; 1314 1315 void VM_PopulateDumpSharedSpace::write_region(FileMapInfo* mapinfo, int region_idx, 1316 DumpRegion* dump_region, bool read_only, bool allow_exec) { 1317 mapinfo->write_region(region_idx, dump_region->base(), dump_region->used(), read_only, allow_exec); 1318 } 1319 1320 void VM_PopulateDumpSharedSpace::dump_symbols() { 1321 tty->print_cr("Dumping symbol table ..."); 1322 1323 NOT_PRODUCT(SymbolTable::verify()); 1324 SymbolTable::write_to_archive(); 1325 } 1326 1327 char* VM_PopulateDumpSharedSpace::dump_read_only_tables() { 1328 ArchiveCompactor::OtherROAllocMark mark; 1329 // Reorder the system dictionary. Moving the symbols affects 1330 // how the hash table indices are calculated. 1331 SystemDictionary::reorder_dictionary_for_sharing(); 1332 1333 tty->print("Removing java_mirror ... "); 1334 if (!HeapShared::is_heap_object_archiving_allowed()) { 1335 clear_basic_type_mirrors(); 1336 } 1337 remove_java_mirror_in_classes(); 1338 tty->print_cr("done. "); 1339 NOT_PRODUCT(SystemDictionary::verify();) 1340 1341 size_t buckets_bytes = SystemDictionary::count_bytes_for_buckets(); 1342 char* buckets_top = _ro_region.allocate(buckets_bytes, sizeof(intptr_t)); 1343 SystemDictionary::copy_buckets(buckets_top, _ro_region.top()); 1344 1345 size_t table_bytes = SystemDictionary::count_bytes_for_table(); 1346 char* table_top = _ro_region.allocate(table_bytes, sizeof(intptr_t)); 1347 SystemDictionary::copy_table(table_top, _ro_region.top()); 1348 1349 // Write the other data to the output array. 1350 WriteClosure wc(&_ro_region); 1351 MetaspaceShared::serialize(&wc); 1352 1353 // Write the bitmaps for patching the archive heap regions 1354 dump_archive_heap_oopmaps(); 1355 1356 return buckets_top; 1357 } 1358 1359 void VM_PopulateDumpSharedSpace::doit() { 1360 Thread* THREAD = VMThread::vm_thread(); 1361 1362 FileMapInfo::check_nonempty_dir_in_shared_path_table(); 1363 1364 NOT_PRODUCT(SystemDictionary::verify();) 1365 // The following guarantee is meant to ensure that no loader constraints 1366 // exist yet, since the constraints table is not shared. This becomes 1367 // more important now that we don't re-initialize vtables/itables for 1368 // shared classes at runtime, where constraints were previously created. 1369 guarantee(SystemDictionary::constraints()->number_of_entries() == 0, 1370 "loader constraints are not saved"); 1371 guarantee(SystemDictionary::placeholders()->number_of_entries() == 0, 1372 "placeholders are not saved"); 1373 // Revisit and implement this if we prelink method handle call sites: 1374 guarantee(SystemDictionary::invoke_method_table() == NULL || 1375 SystemDictionary::invoke_method_table()->number_of_entries() == 0, 1376 "invoke method table is not saved"); 1377 1378 // At this point, many classes have been loaded. 1379 // Gather systemDictionary classes in a global array and do everything to 1380 // that so we don't have to walk the SystemDictionary again. 1381 _global_klass_objects = new GrowableArray<Klass*>(1000); 1382 CollectClassesClosure collect_classes; 1383 ClassLoaderDataGraph::loaded_classes_do(&collect_classes); 1384 1385 tty->print_cr("Number of classes %d", _global_klass_objects->length()); 1386 { 1387 int num_type_array = 0, num_obj_array = 0, num_inst = 0; 1388 for (int i = 0; i < _global_klass_objects->length(); i++) { 1389 Klass* k = _global_klass_objects->at(i); 1390 if (k->is_instance_klass()) { 1391 num_inst ++; 1392 } else if (k->is_objArray_klass()) { 1393 num_obj_array ++; 1394 } else { 1395 assert(k->is_typeArray_klass(), "sanity"); 1396 num_type_array ++; 1397 } 1398 } 1399 tty->print_cr(" instance classes = %5d", num_inst); 1400 tty->print_cr(" obj array classes = %5d", num_obj_array); 1401 tty->print_cr(" type array classes = %5d", num_type_array); 1402 } 1403 1404 // Ensure the ConstMethods won't be modified at run-time 1405 tty->print("Updating ConstMethods ... "); 1406 rewrite_nofast_bytecodes_and_calculate_fingerprints(); 1407 tty->print_cr("done. "); 1408 1409 // Move classes from platform/system dictionaries into the boot dictionary 1410 SystemDictionary::combine_shared_dictionaries(); 1411 1412 // Make sure all classes have a correct loader type. 1413 ClassLoaderData::the_null_class_loader_data()->dictionary()->classes_do(MetaspaceShared::check_shared_class_loader_type); 1414 1415 // Remove all references outside the metadata 1416 tty->print("Removing unshareable information ... "); 1417 remove_unshareable_in_classes(); 1418 tty->print_cr("done. "); 1419 1420 // We don't support archiving unsafe anonymous classes. Verify that they are not stored in 1421 // any dictionaries. 1422 NOT_PRODUCT(assert_no_unsafe_anonymous_classes_in_dictionaries()); 1423 1424 SystemDictionaryShared::finalize_verification_constraints(); 1425 1426 ArchiveCompactor::initialize(); 1427 ArchiveCompactor::copy_and_compact(); 1428 1429 dump_symbols(); 1430 1431 // Dump supported java heap objects 1432 _closed_archive_heap_regions = NULL; 1433 _open_archive_heap_regions = NULL; 1434 dump_java_heap_objects(); 1435 1436 ArchiveCompactor::relocate_well_known_klasses(); 1437 1438 char* read_only_tables_start = dump_read_only_tables(); 1439 _ro_region.pack(&_md_region); 1440 1441 char* vtbl_list = _md_region.top(); 1442 MetaspaceShared::allocate_cpp_vtable_clones(); 1443 _md_region.pack(&_od_region); 1444 1445 // Relocate the archived class file data into the od region 1446 relocate_cached_class_file(); 1447 _od_region.pack(); 1448 1449 // The 5 core spaces are allocated consecutively mc->rw->ro->md->od, so there total size 1450 // is just the spaces between the two ends. 1451 size_t core_spaces_size = _od_region.end() - _mc_region.base(); 1452 assert(core_spaces_size == (size_t)align_up(core_spaces_size, Metaspace::reserve_alignment()), 1453 "should already be aligned"); 1454 1455 // During patching, some virtual methods may be called, so at this point 1456 // the vtables must contain valid methods (as filled in by CppVtableCloner::allocate). 1457 MetaspaceShared::patch_cpp_vtable_pointers(); 1458 1459 // The vtable clones contain addresses of the current process. 1460 // We don't want to write these addresses into the archive. 1461 MetaspaceShared::zero_cpp_vtable_clones_for_writing(); 1462 1463 // Create and write the archive file that maps the shared spaces. 1464 1465 FileMapInfo* mapinfo = new FileMapInfo(); 1466 mapinfo->populate_header(os::vm_allocation_granularity()); 1467 mapinfo->set_read_only_tables_start(read_only_tables_start); 1468 mapinfo->set_misc_data_patching_start(vtbl_list); 1469 mapinfo->set_cds_i2i_entry_code_buffers(MetaspaceShared::cds_i2i_entry_code_buffers()); 1470 mapinfo->set_cds_i2i_entry_code_buffers_size(MetaspaceShared::cds_i2i_entry_code_buffers_size()); 1471 mapinfo->set_core_spaces_size(core_spaces_size); 1472 1473 for (int pass=1; pass<=2; pass++) { 1474 if (pass == 1) { 1475 // The first pass doesn't actually write the data to disk. All it 1476 // does is to update the fields in the mapinfo->_header. 1477 } else { 1478 // After the first pass, the contents of mapinfo->_header are finalized, 1479 // so we can compute the header's CRC, and write the contents of the header 1480 // and the regions into disk. 1481 mapinfo->open_for_write(); 1482 mapinfo->set_header_crc(mapinfo->compute_header_crc()); 1483 } 1484 mapinfo->write_header(); 1485 1486 // NOTE: md contains the trampoline code for method entries, which are patched at run time, 1487 // so it needs to be read/write. 1488 write_region(mapinfo, MetaspaceShared::mc, &_mc_region, /*read_only=*/false,/*allow_exec=*/true); 1489 write_region(mapinfo, MetaspaceShared::rw, &_rw_region, /*read_only=*/false,/*allow_exec=*/false); 1490 write_region(mapinfo, MetaspaceShared::ro, &_ro_region, /*read_only=*/true, /*allow_exec=*/false); 1491 write_region(mapinfo, MetaspaceShared::md, &_md_region, /*read_only=*/false,/*allow_exec=*/false); 1492 write_region(mapinfo, MetaspaceShared::od, &_od_region, /*read_only=*/true, /*allow_exec=*/false); 1493 1494 _total_string_region_size = mapinfo->write_archive_heap_regions( 1495 _closed_archive_heap_regions, 1496 _closed_archive_heap_oopmaps, 1497 MetaspaceShared::first_string, 1498 MetaspaceShared::max_strings); 1499 _total_open_archive_region_size = mapinfo->write_archive_heap_regions( 1500 _open_archive_heap_regions, 1501 _open_archive_heap_oopmaps, 1502 MetaspaceShared::first_open_archive_heap_region, 1503 MetaspaceShared::max_open_archive_heap_region); 1504 } 1505 1506 mapinfo->close(); 1507 1508 // Restore the vtable in case we invoke any virtual methods. 1509 MetaspaceShared::clone_cpp_vtables((intptr_t*)vtbl_list); 1510 1511 print_region_stats(); 1512 1513 if (log_is_enabled(Info, cds)) { 1514 ArchiveCompactor::alloc_stats()->print_stats(int(_ro_region.used()), int(_rw_region.used()), 1515 int(_mc_region.used()), int(_md_region.used())); 1516 } 1517 1518 if (PrintSystemDictionaryAtExit) { 1519 SystemDictionary::print(); 1520 } 1521 // There may be other pending VM operations that operate on the InstanceKlasses, 1522 // which will fail because InstanceKlasses::remove_unshareable_info() 1523 // has been called. Forget these operations and exit the VM directly. 1524 vm_direct_exit(0); 1525 } 1526 1527 void VM_PopulateDumpSharedSpace::print_region_stats() { 1528 // Print statistics of all the regions 1529 const size_t total_reserved = _ro_region.reserved() + _rw_region.reserved() + 1530 _mc_region.reserved() + _md_region.reserved() + 1531 _od_region.reserved() + 1532 _total_string_region_size + 1533 _total_open_archive_region_size; 1534 const size_t total_bytes = _ro_region.used() + _rw_region.used() + 1535 _mc_region.used() + _md_region.used() + 1536 _od_region.used() + 1537 _total_string_region_size + 1538 _total_open_archive_region_size; 1539 const double total_u_perc = percent_of(total_bytes, total_reserved); 1540 1541 _mc_region.print(total_reserved); 1542 _rw_region.print(total_reserved); 1543 _ro_region.print(total_reserved); 1544 _md_region.print(total_reserved); 1545 _od_region.print(total_reserved); 1546 print_heap_region_stats(_closed_archive_heap_regions, "st", total_reserved); 1547 print_heap_region_stats(_open_archive_heap_regions, "oa", total_reserved); 1548 1549 tty->print_cr("total : " SIZE_FORMAT_W(9) " [100.0%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used]", 1550 total_bytes, total_reserved, total_u_perc); 1551 } 1552 1553 void VM_PopulateDumpSharedSpace::print_heap_region_stats(GrowableArray<MemRegion> *heap_mem, 1554 const char *name, const size_t total_size) { 1555 int arr_len = heap_mem == NULL ? 0 : heap_mem->length(); 1556 for (int i = 0; i < arr_len; i++) { 1557 char* start = (char*)heap_mem->at(i).start(); 1558 size_t size = heap_mem->at(i).byte_size(); 1559 char* top = start + size; 1560 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, 1561 name, i, size, size/double(total_size)*100.0, size, p2i(start)); 1562 1563 } 1564 } 1565 1566 // Update a Java object to point its Klass* to the new location after 1567 // shared archive has been compacted. 1568 void MetaspaceShared::relocate_klass_ptr(oop o) { 1569 assert(DumpSharedSpaces, "sanity"); 1570 Klass* k = ArchiveCompactor::get_relocated_klass(o->klass()); 1571 o->set_klass(k); 1572 } 1573 1574 Klass* MetaspaceShared::get_relocated_klass(Klass *k) { 1575 assert(DumpSharedSpaces, "sanity"); 1576 return ArchiveCompactor::get_relocated_klass(k); 1577 } 1578 1579 class LinkSharedClassesClosure : public KlassClosure { 1580 Thread* THREAD; 1581 bool _made_progress; 1582 public: 1583 LinkSharedClassesClosure(Thread* thread) : THREAD(thread), _made_progress(false) {} 1584 1585 void reset() { _made_progress = false; } 1586 bool made_progress() const { return _made_progress; } 1587 1588 void do_klass(Klass* k) { 1589 if (k->is_instance_klass()) { 1590 InstanceKlass* ik = InstanceKlass::cast(k); 1591 // Link the class to cause the bytecodes to be rewritten and the 1592 // cpcache to be created. Class verification is done according 1593 // to -Xverify setting. 1594 _made_progress |= MetaspaceShared::try_link_class(ik, THREAD); 1595 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class"); 1596 1597 ik->constants()->resolve_class_constants(THREAD); 1598 } 1599 } 1600 }; 1601 1602 class CheckSharedClassesClosure : public KlassClosure { 1603 bool _made_progress; 1604 public: 1605 CheckSharedClassesClosure() : _made_progress(false) {} 1606 1607 void reset() { _made_progress = false; } 1608 bool made_progress() const { return _made_progress; } 1609 void do_klass(Klass* k) { 1610 if (k->is_instance_klass() && InstanceKlass::cast(k)->check_sharing_error_state()) { 1611 _made_progress = true; 1612 } 1613 } 1614 }; 1615 1616 void MetaspaceShared::check_shared_class_loader_type(InstanceKlass* ik) { 1617 ResourceMark rm; 1618 if (ik->shared_classpath_index() == UNREGISTERED_INDEX) { 1619 guarantee(ik->loader_type() == 0, 1620 "Class loader type must not be set for this class %s", ik->name()->as_C_string()); 1621 } else { 1622 guarantee(ik->loader_type() != 0, 1623 "Class loader type must be set for this class %s", ik->name()->as_C_string()); 1624 } 1625 } 1626 1627 void MetaspaceShared::link_and_cleanup_shared_classes(TRAPS) { 1628 // We need to iterate because verification may cause additional classes 1629 // to be loaded. 1630 LinkSharedClassesClosure link_closure(THREAD); 1631 do { 1632 link_closure.reset(); 1633 ClassLoaderDataGraph::unlocked_loaded_classes_do(&link_closure); 1634 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class"); 1635 } while (link_closure.made_progress()); 1636 1637 if (_has_error_classes) { 1638 // Mark all classes whose super class or interfaces failed verification. 1639 CheckSharedClassesClosure check_closure; 1640 do { 1641 // Not completely sure if we need to do this iteratively. Anyway, 1642 // we should come here only if there are unverifiable classes, which 1643 // shouldn't happen in normal cases. So better safe than sorry. 1644 check_closure.reset(); 1645 ClassLoaderDataGraph::unlocked_loaded_classes_do(&check_closure); 1646 } while (check_closure.made_progress()); 1647 1648 if (IgnoreUnverifiableClassesDuringDump) { 1649 // This is useful when running JCK or SQE tests. You should not 1650 // enable this when running real apps. 1651 SystemDictionary::remove_classes_in_error_state(); 1652 } else { 1653 tty->print_cr("Please remove the unverifiable classes from your class list and try again"); 1654 exit(1); 1655 } 1656 } 1657 } 1658 1659 void MetaspaceShared::prepare_for_dumping() { 1660 Arguments::check_unsupported_dumping_properties(); 1661 ClassLoader::initialize_shared_path(); 1662 } 1663 1664 // Preload classes from a list, populate the shared spaces and dump to a 1665 // file. 1666 void MetaspaceShared::preload_and_dump(TRAPS) { 1667 { TraceTime timer("Dump Shared Spaces", TRACETIME_LOG(Info, startuptime)); 1668 ResourceMark rm; 1669 char class_list_path_str[JVM_MAXPATHLEN]; 1670 // Preload classes to be shared. 1671 // Should use some os:: method rather than fopen() here. aB. 1672 const char* class_list_path; 1673 if (SharedClassListFile == NULL) { 1674 // Construct the path to the class list (in jre/lib) 1675 // Walk up two directories from the location of the VM and 1676 // optionally tack on "lib" (depending on platform) 1677 os::jvm_path(class_list_path_str, sizeof(class_list_path_str)); 1678 for (int i = 0; i < 3; i++) { 1679 char *end = strrchr(class_list_path_str, *os::file_separator()); 1680 if (end != NULL) *end = '\0'; 1681 } 1682 int class_list_path_len = (int)strlen(class_list_path_str); 1683 if (class_list_path_len >= 3) { 1684 if (strcmp(class_list_path_str + class_list_path_len - 3, "lib") != 0) { 1685 if (class_list_path_len < JVM_MAXPATHLEN - 4) { 1686 jio_snprintf(class_list_path_str + class_list_path_len, 1687 sizeof(class_list_path_str) - class_list_path_len, 1688 "%slib", os::file_separator()); 1689 class_list_path_len += 4; 1690 } 1691 } 1692 } 1693 if (class_list_path_len < JVM_MAXPATHLEN - 10) { 1694 jio_snprintf(class_list_path_str + class_list_path_len, 1695 sizeof(class_list_path_str) - class_list_path_len, 1696 "%sclasslist", os::file_separator()); 1697 } 1698 class_list_path = class_list_path_str; 1699 } else { 1700 class_list_path = SharedClassListFile; 1701 } 1702 1703 tty->print_cr("Loading classes to share ..."); 1704 _has_error_classes = false; 1705 int class_count = preload_classes(class_list_path, THREAD); 1706 if (ExtraSharedClassListFile) { 1707 class_count += preload_classes(ExtraSharedClassListFile, THREAD); 1708 } 1709 tty->print_cr("Loading classes to share: done."); 1710 1711 log_info(cds)("Shared spaces: preloaded %d classes", class_count); 1712 1713 // Rewrite and link classes 1714 tty->print_cr("Rewriting and linking classes ..."); 1715 1716 // Link any classes which got missed. This would happen if we have loaded classes that 1717 // were not explicitly specified in the classlist. E.g., if an interface implemented by class K 1718 // fails verification, all other interfaces that were not specified in the classlist but 1719 // are implemented by K are not verified. 1720 link_and_cleanup_shared_classes(CATCH); 1721 tty->print_cr("Rewriting and linking classes: done"); 1722 1723 SystemDictionary::clear_invoke_method_table(); 1724 HeapShared::init_archivable_static_fields(THREAD); 1725 1726 VM_PopulateDumpSharedSpace op; 1727 VMThread::execute(&op); 1728 } 1729 } 1730 1731 1732 int MetaspaceShared::preload_classes(const char* class_list_path, TRAPS) { 1733 ClassListParser parser(class_list_path); 1734 int class_count = 0; 1735 1736 while (parser.parse_one_line()) { 1737 Klass* klass = ClassLoaderExt::load_one_class(&parser, THREAD); 1738 if (HAS_PENDING_EXCEPTION) { 1739 if (klass == NULL && 1740 (PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_ClassNotFoundException())) { 1741 // print a warning only when the pending exception is class not found 1742 tty->print_cr("Preload Warning: Cannot find %s", parser.current_class_name()); 1743 } 1744 CLEAR_PENDING_EXCEPTION; 1745 } 1746 if (klass != NULL) { 1747 if (log_is_enabled(Trace, cds)) { 1748 ResourceMark rm; 1749 log_trace(cds)("Shared spaces preloaded: %s", klass->external_name()); 1750 } 1751 1752 if (klass->is_instance_klass()) { 1753 InstanceKlass* ik = InstanceKlass::cast(klass); 1754 1755 // Link the class to cause the bytecodes to be rewritten and the 1756 // cpcache to be created. The linking is done as soon as classes 1757 // are loaded in order that the related data structures (klass and 1758 // cpCache) are located together. 1759 try_link_class(ik, THREAD); 1760 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class"); 1761 } 1762 1763 class_count++; 1764 } 1765 } 1766 1767 return class_count; 1768 } 1769 1770 // Returns true if the class's status has changed 1771 bool MetaspaceShared::try_link_class(InstanceKlass* ik, TRAPS) { 1772 assert(DumpSharedSpaces, "should only be called during dumping"); 1773 if (ik->init_state() < InstanceKlass::linked) { 1774 bool saved = BytecodeVerificationLocal; 1775 if (ik->loader_type() == 0 && ik->class_loader() == NULL) { 1776 // The verification decision is based on BytecodeVerificationRemote 1777 // for non-system classes. Since we are using the NULL classloader 1778 // to load non-system classes for customized class loaders during dumping, 1779 // we need to temporarily change BytecodeVerificationLocal to be the same as 1780 // BytecodeVerificationRemote. Note this can cause the parent system 1781 // classes also being verified. The extra overhead is acceptable during 1782 // dumping. 1783 BytecodeVerificationLocal = BytecodeVerificationRemote; 1784 } 1785 ik->link_class(THREAD); 1786 if (HAS_PENDING_EXCEPTION) { 1787 ResourceMark rm; 1788 tty->print_cr("Preload Warning: Verification failed for %s", 1789 ik->external_name()); 1790 CLEAR_PENDING_EXCEPTION; 1791 ik->set_in_error_state(); 1792 _has_error_classes = true; 1793 } 1794 BytecodeVerificationLocal = saved; 1795 return true; 1796 } else { 1797 return false; 1798 } 1799 } 1800 1801 #if INCLUDE_CDS_JAVA_HEAP 1802 void VM_PopulateDumpSharedSpace::dump_java_heap_objects() { 1803 // The closed and open archive heap space has maximum two regions. 1804 // See FileMapInfo::write_archive_heap_regions() for details. 1805 _closed_archive_heap_regions = new GrowableArray<MemRegion>(2); 1806 _open_archive_heap_regions = new GrowableArray<MemRegion>(2); 1807 HeapShared::archive_java_heap_objects(_closed_archive_heap_regions, 1808 _open_archive_heap_regions); 1809 ArchiveCompactor::OtherROAllocMark mark; 1810 HeapShared::write_subgraph_info_table(); 1811 } 1812 1813 void VM_PopulateDumpSharedSpace::dump_archive_heap_oopmaps() { 1814 if (HeapShared::is_heap_object_archiving_allowed()) { 1815 _closed_archive_heap_oopmaps = new GrowableArray<ArchiveHeapOopmapInfo>(2); 1816 dump_archive_heap_oopmaps(_closed_archive_heap_regions, _closed_archive_heap_oopmaps); 1817 1818 _open_archive_heap_oopmaps = new GrowableArray<ArchiveHeapOopmapInfo>(2); 1819 dump_archive_heap_oopmaps(_open_archive_heap_regions, _open_archive_heap_oopmaps); 1820 } 1821 } 1822 1823 void VM_PopulateDumpSharedSpace::dump_archive_heap_oopmaps(GrowableArray<MemRegion>* regions, 1824 GrowableArray<ArchiveHeapOopmapInfo>* oopmaps) { 1825 for (int i=0; i<regions->length(); i++) { 1826 ResourceBitMap oopmap = HeapShared::calculate_oopmap(regions->at(i)); 1827 size_t size_in_bits = oopmap.size(); 1828 size_t size_in_bytes = oopmap.size_in_bytes(); 1829 uintptr_t* buffer = (uintptr_t*)_ro_region.allocate(size_in_bytes, sizeof(intptr_t)); 1830 oopmap.write_to(buffer, size_in_bytes); 1831 log_info(cds)("Oopmap = " INTPTR_FORMAT " (" SIZE_FORMAT_W(6) " bytes) for heap region " 1832 INTPTR_FORMAT " (" SIZE_FORMAT_W(8) " bytes)", 1833 p2i(buffer), size_in_bytes, 1834 p2i(regions->at(i).start()), regions->at(i).byte_size()); 1835 1836 ArchiveHeapOopmapInfo info; 1837 info._oopmap = (address)buffer; 1838 info._oopmap_size_in_bits = size_in_bits; 1839 oopmaps->append(info); 1840 } 1841 } 1842 #endif // INCLUDE_CDS_JAVA_HEAP 1843 1844 // Closure for serializing initialization data in from a data area 1845 // (ptr_array) read from the shared file. 1846 1847 class ReadClosure : public SerializeClosure { 1848 private: 1849 intptr_t** _ptr_array; 1850 1851 inline intptr_t nextPtr() { 1852 return *(*_ptr_array)++; 1853 } 1854 1855 public: 1856 ReadClosure(intptr_t** ptr_array) { _ptr_array = ptr_array; } 1857 1858 void do_ptr(void** p) { 1859 assert(*p == NULL, "initializing previous initialized pointer."); 1860 intptr_t obj = nextPtr(); 1861 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100, 1862 "hit tag while initializing ptrs."); 1863 *p = (void*)obj; 1864 } 1865 1866 void do_u4(u4* p) { 1867 intptr_t obj = nextPtr(); 1868 *p = (u4)(uintx(obj)); 1869 } 1870 1871 void do_tag(int tag) { 1872 int old_tag; 1873 old_tag = (int)(intptr_t)nextPtr(); 1874 // do_int(&old_tag); 1875 assert(tag == old_tag, "old tag doesn't match"); 1876 FileMapInfo::assert_mark(tag == old_tag); 1877 } 1878 1879 void do_oop(oop *p) { 1880 narrowOop o = (narrowOop)nextPtr(); 1881 if (o == 0 || !HeapShared::open_archive_heap_region_mapped()) { 1882 p = NULL; 1883 } else { 1884 assert(HeapShared::is_heap_object_archiving_allowed(), 1885 "Archived heap object is not allowed"); 1886 assert(HeapShared::open_archive_heap_region_mapped(), 1887 "Open archive heap region is not mapped"); 1888 *p = HeapShared::decode_from_archive(o); 1889 } 1890 } 1891 1892 void do_region(u_char* start, size_t size) { 1893 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment"); 1894 assert(size % sizeof(intptr_t) == 0, "bad size"); 1895 do_tag((int)size); 1896 while (size > 0) { 1897 *(intptr_t*)start = nextPtr(); 1898 start += sizeof(intptr_t); 1899 size -= sizeof(intptr_t); 1900 } 1901 } 1902 1903 bool reading() const { return true; } 1904 }; 1905 1906 // Return true if given address is in the misc data region 1907 bool MetaspaceShared::is_in_shared_region(const void* p, int idx) { 1908 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_region(p, idx); 1909 } 1910 1911 bool MetaspaceShared::is_in_trampoline_frame(address addr) { 1912 if (UseSharedSpaces && is_in_shared_region(addr, MetaspaceShared::mc)) { 1913 return true; 1914 } 1915 return false; 1916 } 1917 1918 // Map shared spaces at requested addresses and return if succeeded. 1919 bool MetaspaceShared::map_shared_spaces(FileMapInfo* mapinfo) { 1920 size_t image_alignment = mapinfo->alignment(); 1921 1922 #ifndef _WINDOWS 1923 // Map in the shared memory and then map the regions on top of it. 1924 // On Windows, don't map the memory here because it will cause the 1925 // mappings of the regions to fail. 1926 ReservedSpace shared_rs = mapinfo->reserve_shared_memory(); 1927 if (!shared_rs.is_reserved()) return false; 1928 #endif 1929 1930 assert(!DumpSharedSpaces, "Should not be called with DumpSharedSpaces"); 1931 1932 char* ro_base = NULL; char* ro_top; 1933 char* rw_base = NULL; char* rw_top; 1934 char* mc_base = NULL; char* mc_top; 1935 char* md_base = NULL; char* md_top; 1936 char* od_base = NULL; char* od_top; 1937 1938 // Map each shared region 1939 if ((mc_base = mapinfo->map_region(mc, &mc_top)) != NULL && 1940 (rw_base = mapinfo->map_region(rw, &rw_top)) != NULL && 1941 (ro_base = mapinfo->map_region(ro, &ro_top)) != NULL && 1942 (md_base = mapinfo->map_region(md, &md_top)) != NULL && 1943 (od_base = mapinfo->map_region(od, &od_top)) != NULL && 1944 (image_alignment == (size_t)os::vm_allocation_granularity()) && 1945 mapinfo->validate_shared_path_table()) { 1946 // Success -- set up MetaspaceObj::_shared_metaspace_{base,top} for 1947 // fast checking in MetaspaceShared::is_in_shared_metaspace() and 1948 // MetaspaceObj::is_shared(). 1949 // 1950 // We require that mc->rw->ro->md->od to be laid out consecutively, with no 1951 // gaps between them. That way, we can ensure that the OS won't be able to 1952 // allocate any new memory spaces inside _shared_metaspace_{base,top}, which 1953 // would mess up the simple comparision in MetaspaceShared::is_in_shared_metaspace(). 1954 assert(mc_base < ro_base && mc_base < rw_base && mc_base < md_base && mc_base < od_base, "must be"); 1955 assert(od_top > ro_top && od_top > rw_top && od_top > md_top && od_top > mc_top , "must be"); 1956 assert(mc_top == rw_base, "must be"); 1957 assert(rw_top == ro_base, "must be"); 1958 assert(ro_top == md_base, "must be"); 1959 assert(md_top == od_base, "must be"); 1960 1961 MetaspaceObj::_shared_metaspace_base = (void*)mc_base; 1962 MetaspaceObj::_shared_metaspace_top = (void*)od_top; 1963 return true; 1964 } else { 1965 // If there was a failure in mapping any of the spaces, unmap the ones 1966 // that succeeded 1967 if (ro_base != NULL) mapinfo->unmap_region(ro); 1968 if (rw_base != NULL) mapinfo->unmap_region(rw); 1969 if (mc_base != NULL) mapinfo->unmap_region(mc); 1970 if (md_base != NULL) mapinfo->unmap_region(md); 1971 if (od_base != NULL) mapinfo->unmap_region(od); 1972 #ifndef _WINDOWS 1973 // Release the entire mapped region 1974 shared_rs.release(); 1975 #endif 1976 // If -Xshare:on is specified, print out the error message and exit VM, 1977 // otherwise, set UseSharedSpaces to false and continue. 1978 if (RequireSharedSpaces || PrintSharedArchiveAndExit) { 1979 vm_exit_during_initialization("Unable to use shared archive.", "Failed map_region for using -Xshare:on."); 1980 } else { 1981 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1982 } 1983 return false; 1984 } 1985 } 1986 1987 // Read the miscellaneous data from the shared file, and 1988 // serialize it out to its various destinations. 1989 1990 void MetaspaceShared::initialize_shared_spaces() { 1991 FileMapInfo *mapinfo = FileMapInfo::current_info(); 1992 _cds_i2i_entry_code_buffers = mapinfo->cds_i2i_entry_code_buffers(); 1993 _cds_i2i_entry_code_buffers_size = mapinfo->cds_i2i_entry_code_buffers_size(); 1994 _core_spaces_size = mapinfo->core_spaces_size(); 1995 char* buffer = mapinfo->misc_data_patching_start(); 1996 clone_cpp_vtables((intptr_t*)buffer); 1997 1998 // The rest of the data is now stored in the RW region 1999 buffer = mapinfo->read_only_tables_start(); 2000 int sharedDictionaryLen = *(intptr_t*)buffer; 2001 buffer += sizeof(intptr_t); 2002 int number_of_entries = *(intptr_t*)buffer; 2003 buffer += sizeof(intptr_t); 2004 SystemDictionary::set_shared_dictionary((HashtableBucket<mtClass>*)buffer, 2005 sharedDictionaryLen, 2006 number_of_entries); 2007 buffer += sharedDictionaryLen; 2008 2009 // The following data are the linked list elements 2010 // (HashtableEntry objects) for the shared dictionary table. 2011 2012 int len = *(intptr_t*)buffer; // skip over shared dictionary entries 2013 buffer += sizeof(intptr_t); 2014 buffer += len; 2015 2016 // Verify various attributes of the archive, plus initialize the 2017 // shared string/symbol tables 2018 intptr_t* array = (intptr_t*)buffer; 2019 ReadClosure rc(&array); 2020 serialize(&rc); 2021 2022 // Initialize the run-time symbol table. 2023 SymbolTable::create_table(); 2024 2025 mapinfo->patch_archived_heap_embedded_pointers(); 2026 2027 // Close the mapinfo file 2028 mapinfo->close(); 2029 2030 if (PrintSharedArchiveAndExit) { 2031 if (PrintSharedDictionary) { 2032 tty->print_cr("\nShared classes:\n"); 2033 SystemDictionary::print_shared(tty); 2034 } 2035 if (_archive_loading_failed) { 2036 tty->print_cr("archive is invalid"); 2037 vm_exit(1); 2038 } else { 2039 tty->print_cr("archive is valid"); 2040 vm_exit(0); 2041 } 2042 } 2043 } 2044 2045 // JVM/TI RedefineClasses() support: 2046 bool MetaspaceShared::remap_shared_readonly_as_readwrite() { 2047 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 2048 2049 if (UseSharedSpaces) { 2050 // remap the shared readonly space to shared readwrite, private 2051 FileMapInfo* mapinfo = FileMapInfo::current_info(); 2052 if (!mapinfo->remap_shared_readonly_as_readwrite()) { 2053 return false; 2054 } 2055 _remapped_readwrite = true; 2056 } 2057 return true; 2058 } 2059 2060 void MetaspaceShared::report_out_of_space(const char* name, size_t needed_bytes) { 2061 // This is highly unlikely to happen on 64-bits because we have reserved a 4GB space. 2062 // On 32-bit we reserve only 256MB so you could run out of space with 100,000 classes 2063 // or so. 2064 _mc_region.print_out_of_space_msg(name, needed_bytes); 2065 _rw_region.print_out_of_space_msg(name, needed_bytes); 2066 _ro_region.print_out_of_space_msg(name, needed_bytes); 2067 _md_region.print_out_of_space_msg(name, needed_bytes); 2068 _od_region.print_out_of_space_msg(name, needed_bytes); 2069 2070 vm_exit_during_initialization(err_msg("Unable to allocate from '%s' region", name), 2071 "Please reduce the number of shared classes."); 2072 }