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