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/sharedClassUtil.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 "gc/shared/gcLocker.hpp" 39 #include "interpreter/bytecodeStream.hpp" 40 #include "interpreter/bytecodes.hpp" 41 #include "logging/log.hpp" 42 #include "logging/logMessage.hpp" 43 #include "memory/filemap.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/signature.hpp" 60 #include "runtime/timerTrace.hpp" 61 #include "runtime/vmThread.hpp" 62 #include "runtime/vm_operations.hpp" 63 #include "utilities/align.hpp" 64 #include "utilities/defaultStream.hpp" 65 #include "utilities/hashtable.inline.hpp" 66 #if INCLUDE_ALL_GCS 67 #include "gc/g1/g1Allocator.inline.hpp" 68 #include "gc/g1/g1CollectedHeap.hpp" 69 #endif 70 71 ReservedSpace MetaspaceShared::_shared_rs; 72 VirtualSpace MetaspaceShared::_shared_vs; 73 MetaspaceSharedStats MetaspaceShared::_stats; 74 bool MetaspaceShared::_has_error_classes; 75 bool MetaspaceShared::_archive_loading_failed = false; 76 bool MetaspaceShared::_remapped_readwrite = false; 77 bool MetaspaceShared::_open_archive_heap_region_mapped = false; 78 address MetaspaceShared::_cds_i2i_entry_code_buffers = NULL; 79 size_t MetaspaceShared::_cds_i2i_entry_code_buffers_size = 0; 80 size_t MetaspaceShared::_core_spaces_size = 0; 81 82 // The CDS archive is divided into the following regions: 83 // mc - misc code (the method entry trampolines) 84 // rw - read-write metadata 85 // ro - read-only metadata and read-only tables 86 // md - misc data (the c++ vtables) 87 // od - optional data (original class files) 88 // 89 // s0 - shared strings(closed archive heap space) #0 90 // s1 - shared strings(closed archive heap space) #1 (may be empty) 91 // oa0 - open archive heap space #0 92 // oa1 - open archive heap space #1 (may be empty) 93 // 94 // The mc, rw, ro, md and od regions are linearly allocated, starting from 95 // SharedBaseAddress, in the order of mc->rw->ro->md->od. The size of these 5 regions 96 // are page-aligned, and there's no gap between any consecutive regions. 97 // 98 // These 5 regions are populated in the following steps: 99 // [1] All classes are loaded in MetaspaceShared::preload_classes(). All metadata are 100 // temporarily allocated outside of the shared regions. Only the method entry 101 // trampolines are written into the mc region. 102 // [2] ArchiveCompactor copies RW metadata into the rw region. 103 // [3] ArchiveCompactor copies RO metadata into the ro region. 104 // [4] SymbolTable, StringTable, SystemDictionary, and a few other read-only data 105 // are copied into the ro region as read-only tables. 106 // [5] C++ vtables are copied into the md region. 107 // [6] Original class files are copied into the od region. 108 // 109 // The s0/s1 and oa0/oa1 regions are populated inside MetaspaceShared::dump_java_heap_objects. 110 // Their layout is independent of the other 5 regions. 111 112 class DumpRegion { 113 private: 114 const char* _name; 115 char* _base; 116 char* _top; 117 char* _end; 118 bool _is_packed; 119 120 char* expand_top_to(char* newtop) { 121 assert(is_allocatable(), "must be initialized and not packed"); 122 assert(newtop >= _top, "must not grow backwards"); 123 if (newtop > _end) { 124 MetaspaceShared::report_out_of_space(_name, newtop - _top); 125 ShouldNotReachHere(); 126 } 127 MetaspaceShared::commit_shared_space_to(newtop); 128 _top = newtop; 129 return _top; 130 } 131 132 public: 133 DumpRegion(const char* name) : _name(name), _base(NULL), _top(NULL), _end(NULL), _is_packed(false) {} 134 135 char* allocate(size_t num_bytes, size_t alignment=BytesPerWord) { 136 char* p = (char*)align_up(_top, alignment); 137 char* newtop = p + align_up(num_bytes, alignment); 138 expand_top_to(newtop); 139 memset(p, 0, newtop - p); 140 return p; 141 } 142 143 void append_intptr_t(intptr_t n) { 144 assert(is_aligned(_top, sizeof(intptr_t)), "bad alignment"); 145 intptr_t *p = (intptr_t*)_top; 146 char* newtop = _top + sizeof(intptr_t); 147 expand_top_to(newtop); 148 *p = n; 149 } 150 151 char* base() const { return _base; } 152 char* top() const { return _top; } 153 char* end() const { return _end; } 154 size_t reserved() const { return _end - _base; } 155 size_t used() const { return _top - _base; } 156 bool is_packed() const { return _is_packed; } 157 bool is_allocatable() const { 158 return !is_packed() && _base != NULL; 159 } 160 161 void print(size_t total_bytes) const { 162 tty->print_cr("%-3s space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used] at " INTPTR_FORMAT, 163 _name, used(), percent_of(used(), total_bytes), reserved(), percent_of(used(), reserved()), p2i(_base)); 164 } 165 void print_out_of_space_msg(const char* failing_region, size_t needed_bytes) { 166 tty->print("[%-8s] " PTR_FORMAT " - " PTR_FORMAT " capacity =%9d, allocated =%9d", 167 _name, p2i(_base), p2i(_top), int(_end - _base), int(_top - _base)); 168 if (strcmp(_name, failing_region) == 0) { 169 tty->print_cr(" required = %d", int(needed_bytes)); 170 } else { 171 tty->cr(); 172 } 173 } 174 175 void init(const ReservedSpace* rs) { 176 _base = _top = rs->base(); 177 _end = rs->end(); 178 } 179 void init(char* b, char* t, char* e) { 180 _base = b; 181 _top = t; 182 _end = e; 183 } 184 185 void pack(DumpRegion* next = NULL) { 186 assert(!is_packed(), "sanity"); 187 _end = (char*)align_up(_top, Metaspace::reserve_alignment()); 188 _is_packed = true; 189 if (next != NULL) { 190 next->_base = next->_top = this->_end; 191 next->_end = MetaspaceShared::shared_rs()->end(); 192 } 193 } 194 bool contains(char* p) { 195 return base() <= p && p < top(); 196 } 197 }; 198 199 200 DumpRegion _mc_region("mc"), _ro_region("ro"), _rw_region("rw"), _md_region("md"), _od_region("od"); 201 size_t _total_string_region_size = 0, _total_open_archive_region_size = 0; 202 203 char* MetaspaceShared::misc_code_space_alloc(size_t num_bytes) { 204 return _mc_region.allocate(num_bytes); 205 } 206 207 char* MetaspaceShared::read_only_space_alloc(size_t num_bytes) { 208 return _ro_region.allocate(num_bytes); 209 } 210 211 void MetaspaceShared::initialize_runtime_shared_and_meta_spaces() { 212 assert(UseSharedSpaces, "Must be called when UseSharedSpaces is enabled"); 213 214 // If using shared space, open the file that contains the shared space 215 // and map in the memory before initializing the rest of metaspace (so 216 // the addresses don't conflict) 217 address cds_address = NULL; 218 FileMapInfo* mapinfo = new FileMapInfo(); 219 220 // Open the shared archive file, read and validate the header. If 221 // initialization fails, shared spaces [UseSharedSpaces] are 222 // disabled and the file is closed. 223 // Map in spaces now also 224 if (mapinfo->initialize() && map_shared_spaces(mapinfo)) { 225 size_t cds_total = core_spaces_size(); 226 cds_address = (address)mapinfo->header()->region_addr(0); 227 #ifdef _LP64 228 if (Metaspace::using_class_space()) { 229 char* cds_end = (char*)(cds_address + cds_total); 230 cds_end = (char *)align_up(cds_end, Metaspace::reserve_alignment()); 231 // If UseCompressedClassPointers is set then allocate the metaspace area 232 // above the heap and above the CDS area (if it exists). 233 Metaspace::allocate_metaspace_compressed_klass_ptrs(cds_end, cds_address); 234 // map_heap_regions() compares the current narrow oop and klass encodings 235 // with the archived ones, so it must be done after all encodings are determined. 236 mapinfo->map_heap_regions(); 237 } 238 Universe::set_narrow_klass_range(CompressedClassSpaceSize); 239 #endif // _LP64 240 } else { 241 assert(!mapinfo->is_open() && !UseSharedSpaces, 242 "archive file not closed or shared spaces not disabled."); 243 } 244 } 245 246 void MetaspaceShared::initialize_dumptime_shared_and_meta_spaces() { 247 assert(DumpSharedSpaces, "should be called for dump time only"); 248 const size_t reserve_alignment = Metaspace::reserve_alignment(); 249 bool large_pages = false; // No large pages when dumping the CDS archive. 250 char* shared_base = (char*)align_up((char*)SharedBaseAddress, reserve_alignment); 251 252 #ifdef _LP64 253 // On 64-bit VM, the heap and class space layout will be the same as if 254 // you're running in -Xshare:on mode: 255 // 256 // +-- SharedBaseAddress (default = 0x800000000) 257 // v 258 // +-..---------+---------+ ... +----+----+----+----+----+---------------+ 259 // | Heap | Archive | | MC | RW | RO | MD | OD | class space | 260 // +-..---------+---------+ ... +----+----+----+----+----+---------------+ 261 // |<-- MaxHeapSize -->| |<-- UnscaledClassSpaceMax = 4GB ------->| 262 // 263 const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1); 264 const size_t cds_total = align_down(UnscaledClassSpaceMax, reserve_alignment); 265 #else 266 // We don't support archives larger than 256MB on 32-bit due to limited virtual address space. 267 size_t cds_total = align_down(256*M, reserve_alignment); 268 #endif 269 270 // First try to reserve the space at the specified SharedBaseAddress. 271 _shared_rs = ReservedSpace(cds_total, reserve_alignment, large_pages, shared_base); 272 if (_shared_rs.is_reserved()) { 273 assert(shared_base == 0 || _shared_rs.base() == shared_base, "should match"); 274 } else { 275 // Get a mmap region anywhere if the SharedBaseAddress fails. 276 _shared_rs = ReservedSpace(cds_total, reserve_alignment, large_pages); 277 } 278 if (!_shared_rs.is_reserved()) { 279 vm_exit_during_initialization("Unable to reserve memory for shared space", 280 err_msg(SIZE_FORMAT " bytes.", cds_total)); 281 } 282 283 #ifdef _LP64 284 // During dump time, we allocate 4GB (UnscaledClassSpaceMax) of space and split it up: 285 // + The upper 1 GB is used as the "temporary compressed class space" -- preload_classes() 286 // will store Klasses into this space. 287 // + The lower 3 GB is used for the archive -- when preload_classes() is done, 288 // ArchiveCompactor will copy the class metadata into this space, first the RW parts, 289 // then the RO parts. 290 291 assert(UseCompressedOops && UseCompressedClassPointers, 292 "UseCompressedOops and UseCompressedClassPointers must be set"); 293 294 size_t max_archive_size = align_down(cds_total * 3 / 4, reserve_alignment); 295 ReservedSpace tmp_class_space = _shared_rs.last_part(max_archive_size); 296 CompressedClassSpaceSize = align_down(tmp_class_space.size(), reserve_alignment); 297 _shared_rs = _shared_rs.first_part(max_archive_size); 298 299 // Set up compress class pointers. 300 Universe::set_narrow_klass_base((address)_shared_rs.base()); 301 // Set narrow_klass_shift to be LogKlassAlignmentInBytes. This is consistent 302 // with AOT. 303 Universe::set_narrow_klass_shift(LogKlassAlignmentInBytes); 304 // Set the range of klass addresses to 4GB. 305 Universe::set_narrow_klass_range(cds_total); 306 307 Metaspace::initialize_class_space(tmp_class_space); 308 tty->print_cr("narrow_klass_base = " PTR_FORMAT ", narrow_klass_shift = %d", 309 p2i(Universe::narrow_klass_base()), Universe::narrow_klass_shift()); 310 311 tty->print_cr("Allocated temporary class space: " SIZE_FORMAT " bytes at " PTR_FORMAT, 312 CompressedClassSpaceSize, p2i(tmp_class_space.base())); 313 #endif 314 315 // Start with 0 committed bytes. The memory will be committed as needed by 316 // MetaspaceShared::commit_shared_space_to(). 317 if (!_shared_vs.initialize(_shared_rs, 0)) { 318 vm_exit_during_initialization("Unable to allocate memory for shared space"); 319 } 320 321 _mc_region.init(&_shared_rs); 322 tty->print_cr("Allocated shared space: " SIZE_FORMAT " bytes at " PTR_FORMAT, 323 _shared_rs.size(), p2i(_shared_rs.base())); 324 } 325 326 void MetaspaceShared::commit_shared_space_to(char* newtop) { 327 assert(DumpSharedSpaces, "dump-time only"); 328 char* base = _shared_rs.base(); 329 size_t need_committed_size = newtop - base; 330 size_t has_committed_size = _shared_vs.committed_size(); 331 if (need_committed_size < has_committed_size) { 332 return; 333 } 334 335 size_t min_bytes = need_committed_size - has_committed_size; 336 size_t preferred_bytes = 1 * M; 337 size_t uncommitted = _shared_vs.reserved_size() - has_committed_size; 338 339 size_t commit = MAX2(min_bytes, preferred_bytes); 340 assert(commit <= uncommitted, "sanity"); 341 342 bool result = _shared_vs.expand_by(commit, false); 343 if (!result) { 344 vm_exit_during_initialization(err_msg("Failed to expand shared space to " SIZE_FORMAT " bytes", 345 need_committed_size)); 346 } 347 348 log_info(cds)("Expanding shared spaces by " SIZE_FORMAT_W(7) " bytes [total " SIZE_FORMAT_W(9) " bytes ending at %p]", 349 commit, _shared_vs.actual_committed_size(), _shared_vs.high()); 350 } 351 352 // Read/write a data stream for restoring/preserving metadata pointers and 353 // miscellaneous data from/to the shared archive file. 354 355 void MetaspaceShared::serialize(SerializeClosure* soc) { 356 int tag = 0; 357 soc->do_tag(--tag); 358 359 // Verify the sizes of various metadata in the system. 360 soc->do_tag(sizeof(Method)); 361 soc->do_tag(sizeof(ConstMethod)); 362 soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE)); 363 soc->do_tag(sizeof(ConstantPool)); 364 soc->do_tag(sizeof(ConstantPoolCache)); 365 soc->do_tag(objArrayOopDesc::base_offset_in_bytes()); 366 soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE)); 367 soc->do_tag(sizeof(Symbol)); 368 369 // Dump/restore miscellaneous metadata. 370 Universe::serialize(soc, true); 371 soc->do_tag(--tag); 372 373 // Dump/restore references to commonly used names and signatures. 374 vmSymbols::serialize(soc); 375 soc->do_tag(--tag); 376 377 // Dump/restore the symbol and string tables 378 SymbolTable::serialize(soc); 379 StringTable::serialize(soc); 380 soc->do_tag(--tag); 381 382 serialize_well_known_classes(soc); 383 soc->do_tag(--tag); 384 385 soc->do_tag(666); 386 } 387 388 void MetaspaceShared::serialize_well_known_classes(SerializeClosure* soc) { 389 java_lang_Class::serialize(soc); 390 java_lang_String::serialize(soc); 391 java_lang_System::serialize(soc); 392 java_lang_ClassLoader::serialize(soc); 393 java_lang_Throwable::serialize(soc); 394 java_lang_Thread::serialize(soc); 395 java_lang_ThreadGroup::serialize(soc); 396 java_lang_AssertionStatusDirectives::serialize(soc); 397 java_lang_ref_SoftReference::serialize(soc); 398 java_lang_invoke_MethodHandle::serialize(soc); 399 java_lang_invoke_DirectMethodHandle::serialize(soc); 400 java_lang_invoke_MemberName::serialize(soc); 401 java_lang_invoke_ResolvedMethodName::serialize(soc); 402 java_lang_invoke_LambdaForm::serialize(soc); 403 java_lang_invoke_MethodType::serialize(soc); 404 java_lang_invoke_CallSite::serialize(soc); 405 java_lang_invoke_MethodHandleNatives_CallSiteContext::serialize(soc); 406 java_security_AccessControlContext::serialize(soc); 407 java_lang_reflect_AccessibleObject::serialize(soc); 408 java_lang_reflect_Method::serialize(soc); 409 java_lang_reflect_Constructor::serialize(soc); 410 java_lang_reflect_Field::serialize(soc); 411 java_nio_Buffer::serialize(soc); 412 reflect_ConstantPool::serialize(soc); 413 reflect_UnsafeStaticFieldAccessorImpl::serialize(soc); 414 java_lang_reflect_Parameter::serialize(soc); 415 java_lang_Module::serialize(soc); 416 java_lang_StackTraceElement::serialize(soc); 417 java_lang_StackFrameInfo::serialize(soc); 418 java_lang_LiveStackFrameInfo::serialize(soc); 419 } 420 421 address MetaspaceShared::cds_i2i_entry_code_buffers(size_t total_size) { 422 if (DumpSharedSpaces) { 423 if (_cds_i2i_entry_code_buffers == NULL) { 424 _cds_i2i_entry_code_buffers = (address)misc_code_space_alloc(total_size); 425 _cds_i2i_entry_code_buffers_size = total_size; 426 } 427 } else if (UseSharedSpaces) { 428 assert(_cds_i2i_entry_code_buffers != NULL, "must already been initialized"); 429 } else { 430 return NULL; 431 } 432 433 assert(_cds_i2i_entry_code_buffers_size == total_size, "must not change"); 434 return _cds_i2i_entry_code_buffers; 435 } 436 437 // CDS code for dumping shared archive. 438 439 // Global object for holding classes that have been loaded. Since this 440 // is run at a safepoint just before exit, this is the entire set of classes. 441 static GrowableArray<Klass*>* _global_klass_objects; 442 443 static void collect_array_classes(Klass* k) { 444 _global_klass_objects->append_if_missing(k); 445 if (k->is_array_klass()) { 446 // Add in the array classes too 447 ArrayKlass* ak = ArrayKlass::cast(k); 448 Klass* h = ak->higher_dimension(); 449 if (h != NULL) { 450 h->array_klasses_do(collect_array_classes); 451 } 452 } 453 } 454 455 class CollectClassesClosure : public KlassClosure { 456 void do_klass(Klass* k) { 457 if (!UseAppCDS && !k->class_loader_data()->is_the_null_class_loader_data()) { 458 // AppCDS is not enabled. Let's omit non-boot classes. 459 return; 460 } 461 462 if (!(k->is_instance_klass() && InstanceKlass::cast(k)->is_in_error_state())) { 463 if (k->is_instance_klass() && InstanceKlass::cast(k)->signers() != NULL) { 464 // Mark any class with signers and don't add to the _global_klass_objects 465 k->set_has_signer_and_not_archived(); 466 } else { 467 _global_klass_objects->append_if_missing(k); 468 } 469 } 470 if (k->is_array_klass()) { 471 // Add in the array classes too 472 ArrayKlass* ak = ArrayKlass::cast(k); 473 Klass* h = ak->higher_dimension(); 474 if (h != NULL) { 475 h->array_klasses_do(collect_array_classes); 476 } 477 } 478 } 479 }; 480 481 static void remove_unshareable_in_classes() { 482 for (int i = 0; i < _global_klass_objects->length(); i++) { 483 Klass* k = _global_klass_objects->at(i); 484 if (!k->is_objArray_klass()) { 485 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info 486 // on their array classes. 487 assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be"); 488 k->remove_unshareable_info(); 489 } 490 } 491 } 492 493 static void remove_java_mirror_in_classes() { 494 for (int i = 0; i < _global_klass_objects->length(); i++) { 495 Klass* k = _global_klass_objects->at(i); 496 if (!k->is_objArray_klass()) { 497 // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info 498 // on their array classes. 499 assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be"); 500 k->remove_java_mirror(); 501 } 502 } 503 } 504 505 static void clear_basic_type_mirrors() { 506 assert(!MetaspaceShared::is_heap_object_archiving_allowed(), "Sanity"); 507 Universe::set_int_mirror(NULL); 508 Universe::set_float_mirror(NULL); 509 Universe::set_double_mirror(NULL); 510 Universe::set_byte_mirror(NULL); 511 Universe::set_bool_mirror(NULL); 512 Universe::set_char_mirror(NULL); 513 Universe::set_long_mirror(NULL); 514 Universe::set_short_mirror(NULL); 515 Universe::set_void_mirror(NULL); 516 } 517 518 static void rewrite_nofast_bytecode(Method* method) { 519 BytecodeStream bcs(method); 520 while (!bcs.is_last_bytecode()) { 521 Bytecodes::Code opcode = bcs.next(); 522 switch (opcode) { 523 case Bytecodes::_getfield: *bcs.bcp() = Bytecodes::_nofast_getfield; break; 524 case Bytecodes::_putfield: *bcs.bcp() = Bytecodes::_nofast_putfield; break; 525 case Bytecodes::_aload_0: *bcs.bcp() = Bytecodes::_nofast_aload_0; break; 526 case Bytecodes::_iload: { 527 if (!bcs.is_wide()) { 528 *bcs.bcp() = Bytecodes::_nofast_iload; 529 } 530 break; 531 } 532 default: break; 533 } 534 } 535 } 536 537 // Walk all methods in the class list to ensure that they won't be modified at 538 // run time. This includes: 539 // [1] Rewrite all bytecodes as needed, so that the ConstMethod* will not be modified 540 // at run time by RewriteBytecodes/RewriteFrequentPairs 541 // [2] Assign a fingerprint, so one doesn't need to be assigned at run-time. 542 static void rewrite_nofast_bytecodes_and_calculate_fingerprints() { 543 for (int i = 0; i < _global_klass_objects->length(); i++) { 544 Klass* k = _global_klass_objects->at(i); 545 if (k->is_instance_klass()) { 546 InstanceKlass* ik = InstanceKlass::cast(k); 547 for (int i = 0; i < ik->methods()->length(); i++) { 548 Method* m = ik->methods()->at(i); 549 rewrite_nofast_bytecode(m); 550 Fingerprinter fp(m); 551 // The side effect of this call sets method's fingerprint field. 552 fp.fingerprint(); 553 } 554 } 555 } 556 } 557 558 static void relocate_cached_class_file() { 559 for (int i = 0; i < _global_klass_objects->length(); i++) { 560 Klass* k = _global_klass_objects->at(i); 561 if (k->is_instance_klass()) { 562 InstanceKlass* ik = InstanceKlass::cast(k); 563 JvmtiCachedClassFileData* p = ik->get_archived_class_data(); 564 if (p != NULL) { 565 int size = offset_of(JvmtiCachedClassFileData, data) + p->length; 566 JvmtiCachedClassFileData* q = (JvmtiCachedClassFileData*)_od_region.allocate(size); 567 q->length = p->length; 568 memcpy(q->data, p->data, p->length); 569 ik->set_archived_class_data(q); 570 } 571 } 572 } 573 } 574 575 NOT_PRODUCT( 576 static void assert_not_anonymous_class(InstanceKlass* k) { 577 assert(!(k->is_anonymous()), "cannot archive anonymous classes"); 578 } 579 580 // Anonymous classes are not stored inside any dictionaries. They are created by 581 // SystemDictionary::parse_stream() with a non-null host_klass. 582 static void assert_no_anonymoys_classes_in_dictionaries() { 583 ClassLoaderDataGraph::dictionary_classes_do(assert_not_anonymous_class); 584 }) 585 586 // Objects of the Metadata types (such as Klass and ConstantPool) have C++ vtables. 587 // (In GCC this is the field <Type>::_vptr, i.e., first word in the object.) 588 // 589 // Addresses of the vtables and the methods may be different across JVM runs, 590 // if libjvm.so is dynamically loaded at a different base address. 591 // 592 // To ensure that the Metadata objects in the CDS archive always have the correct vtable: 593 // 594 // + at dump time: we redirect the _vptr to point to our own vtables inside 595 // the CDS image 596 // + at run time: we clone the actual contents of the vtables from libjvm.so 597 // into our own tables. 598 599 // Currently, the archive contain ONLY the following types of objects that have C++ vtables. 600 #define CPP_VTABLE_PATCH_TYPES_DO(f) \ 601 f(ConstantPool) \ 602 f(InstanceKlass) \ 603 f(InstanceClassLoaderKlass) \ 604 f(InstanceMirrorKlass) \ 605 f(InstanceRefKlass) \ 606 f(Method) \ 607 f(ObjArrayKlass) \ 608 f(TypeArrayKlass) 609 610 class CppVtableInfo { 611 intptr_t _vtable_size; 612 intptr_t _cloned_vtable[1]; 613 public: 614 static int num_slots(int vtable_size) { 615 return 1 + vtable_size; // Need to add the space occupied by _vtable_size; 616 } 617 int vtable_size() { return int(uintx(_vtable_size)); } 618 void set_vtable_size(int n) { _vtable_size = intptr_t(n); } 619 intptr_t* cloned_vtable() { return &_cloned_vtable[0]; } 620 void zero() { memset(_cloned_vtable, 0, sizeof(intptr_t) * vtable_size()); } 621 // Returns the address of the next CppVtableInfo that can be placed immediately after this CppVtableInfo 622 static size_t byte_size(int vtable_size) { 623 CppVtableInfo i; 624 return pointer_delta(&i._cloned_vtable[vtable_size], &i, sizeof(u1)); 625 } 626 }; 627 628 template <class T> class CppVtableCloner : public T { 629 static intptr_t* vtable_of(Metadata& m) { 630 return *((intptr_t**)&m); 631 } 632 static CppVtableInfo* _info; 633 634 static int get_vtable_length(const char* name); 635 636 public: 637 // Allocate and initialize the C++ vtable, starting from top, but do not go past end. 638 static intptr_t* allocate(const char* name); 639 640 // Clone the vtable to ... 641 static intptr_t* clone_vtable(const char* name, CppVtableInfo* info); 642 643 static void zero_vtable_clone() { 644 assert(DumpSharedSpaces, "dump-time only"); 645 _info->zero(); 646 } 647 648 // Switch the vtable pointer to point to the cloned vtable. 649 static void patch(Metadata* obj) { 650 assert(DumpSharedSpaces, "dump-time only"); 651 *(void**)obj = (void*)(_info->cloned_vtable()); 652 } 653 654 static bool is_valid_shared_object(const T* obj) { 655 intptr_t* vptr = *(intptr_t**)obj; 656 return vptr == _info->cloned_vtable(); 657 } 658 }; 659 660 template <class T> CppVtableInfo* CppVtableCloner<T>::_info = NULL; 661 662 template <class T> 663 intptr_t* CppVtableCloner<T>::allocate(const char* name) { 664 assert(is_aligned(_md_region.top(), sizeof(intptr_t)), "bad alignment"); 665 int n = get_vtable_length(name); 666 _info = (CppVtableInfo*)_md_region.allocate(CppVtableInfo::byte_size(n), sizeof(intptr_t)); 667 _info->set_vtable_size(n); 668 669 intptr_t* p = clone_vtable(name, _info); 670 assert((char*)p == _md_region.top(), "must be"); 671 672 return p; 673 } 674 675 template <class T> 676 intptr_t* CppVtableCloner<T>::clone_vtable(const char* name, CppVtableInfo* info) { 677 if (!DumpSharedSpaces) { 678 assert(_info == 0, "_info is initialized only at dump time"); 679 _info = info; // Remember it -- it will be used by MetaspaceShared::is_valid_shared_method() 680 } 681 T tmp; // Allocate temporary dummy metadata object to get to the original vtable. 682 int n = info->vtable_size(); 683 intptr_t* srcvtable = vtable_of(tmp); 684 intptr_t* dstvtable = info->cloned_vtable(); 685 686 // We already checked (and, if necessary, adjusted n) when the vtables were allocated, so we are 687 // safe to do memcpy. 688 log_debug(cds, vtables)("Copying %3d vtable entries for %s", n, name); 689 memcpy(dstvtable, srcvtable, sizeof(intptr_t) * n); 690 return dstvtable + n; 691 } 692 693 // To determine the size of the vtable for each type, we use the following 694 // trick by declaring 2 subclasses: 695 // 696 // class CppVtableTesterA: public InstanceKlass {virtual int last_virtual_method() {return 1;} }; 697 // class CppVtableTesterB: public InstanceKlass {virtual void* last_virtual_method() {return NULL}; }; 698 // 699 // CppVtableTesterA and CppVtableTesterB's vtables have the following properties: 700 // - Their size (N+1) is exactly one more than the size of InstanceKlass's vtable (N) 701 // - The first N entries have are exactly the same as in InstanceKlass's vtable. 702 // - Their last entry is different. 703 // 704 // So to determine the value of N, we just walk CppVtableTesterA and CppVtableTesterB's tables 705 // and find the first entry that's different. 706 // 707 // This works on all C++ compilers supported by Oracle, but you may need to tweak it for more 708 // esoteric compilers. 709 710 template <class T> class CppVtableTesterB: public T { 711 public: 712 virtual int last_virtual_method() {return 1;} 713 }; 714 715 template <class T> class CppVtableTesterA : public T { 716 public: 717 virtual void* last_virtual_method() { 718 // Make this different than CppVtableTesterB::last_virtual_method so the C++ 719 // compiler/linker won't alias the two functions. 720 return NULL; 721 } 722 }; 723 724 template <class T> 725 int CppVtableCloner<T>::get_vtable_length(const char* name) { 726 CppVtableTesterA<T> a; 727 CppVtableTesterB<T> b; 728 729 intptr_t* avtable = vtable_of(a); 730 intptr_t* bvtable = vtable_of(b); 731 732 // Start at slot 1, because slot 0 may be RTTI (on Solaris/Sparc) 733 int vtable_len = 1; 734 for (; ; vtable_len++) { 735 if (avtable[vtable_len] != bvtable[vtable_len]) { 736 break; 737 } 738 } 739 log_debug(cds, vtables)("Found %3d vtable entries for %s", vtable_len, name); 740 741 return vtable_len; 742 } 743 744 #define ALLOC_CPP_VTABLE_CLONE(c) \ 745 CppVtableCloner<c>::allocate(#c); 746 747 #define CLONE_CPP_VTABLE(c) \ 748 p = CppVtableCloner<c>::clone_vtable(#c, (CppVtableInfo*)p); 749 750 #define ZERO_CPP_VTABLE(c) \ 751 CppVtableCloner<c>::zero_vtable_clone(); 752 753 // This can be called at both dump time and run time. 754 intptr_t* MetaspaceShared::clone_cpp_vtables(intptr_t* p) { 755 assert(DumpSharedSpaces || UseSharedSpaces, "sanity"); 756 CPP_VTABLE_PATCH_TYPES_DO(CLONE_CPP_VTABLE); 757 return p; 758 } 759 760 void MetaspaceShared::zero_cpp_vtable_clones_for_writing() { 761 assert(DumpSharedSpaces, "dump-time only"); 762 CPP_VTABLE_PATCH_TYPES_DO(ZERO_CPP_VTABLE); 763 } 764 765 // Allocate and initialize the C++ vtables, starting from top, but do not go past end. 766 void MetaspaceShared::allocate_cpp_vtable_clones() { 767 assert(DumpSharedSpaces, "dump-time only"); 768 // Layout (each slot is a intptr_t): 769 // [number of slots in the first vtable = n1] 770 // [ <n1> slots for the first vtable] 771 // [number of slots in the first second = n2] 772 // [ <n2> slots for the second vtable] 773 // ... 774 // The order of the vtables is the same as the CPP_VTAB_PATCH_TYPES_DO macro. 775 CPP_VTABLE_PATCH_TYPES_DO(ALLOC_CPP_VTABLE_CLONE); 776 } 777 778 // Switch the vtable pointer to point to the cloned vtable. We assume the 779 // vtable pointer is in first slot in object. 780 void MetaspaceShared::patch_cpp_vtable_pointers() { 781 int n = _global_klass_objects->length(); 782 for (int i = 0; i < n; i++) { 783 Klass* obj = _global_klass_objects->at(i); 784 if (obj->is_instance_klass()) { 785 InstanceKlass* ik = InstanceKlass::cast(obj); 786 if (ik->is_class_loader_instance_klass()) { 787 CppVtableCloner<InstanceClassLoaderKlass>::patch(ik); 788 } else if (ik->is_reference_instance_klass()) { 789 CppVtableCloner<InstanceRefKlass>::patch(ik); 790 } else if (ik->is_mirror_instance_klass()) { 791 CppVtableCloner<InstanceMirrorKlass>::patch(ik); 792 } else { 793 CppVtableCloner<InstanceKlass>::patch(ik); 794 } 795 ConstantPool* cp = ik->constants(); 796 CppVtableCloner<ConstantPool>::patch(cp); 797 for (int j = 0; j < ik->methods()->length(); j++) { 798 Method* m = ik->methods()->at(j); 799 CppVtableCloner<Method>::patch(m); 800 assert(CppVtableCloner<Method>::is_valid_shared_object(m), "must be"); 801 } 802 } else if (obj->is_objArray_klass()) { 803 CppVtableCloner<ObjArrayKlass>::patch(obj); 804 } else { 805 assert(obj->is_typeArray_klass(), "sanity"); 806 CppVtableCloner<TypeArrayKlass>::patch(obj); 807 } 808 } 809 } 810 811 bool MetaspaceShared::is_valid_shared_method(const Method* m) { 812 assert(is_in_shared_metaspace(m), "must be"); 813 return CppVtableCloner<Method>::is_valid_shared_object(m); 814 } 815 816 // Closure for serializing initialization data out to a data area to be 817 // written to the shared file. 818 819 class WriteClosure : public SerializeClosure { 820 private: 821 DumpRegion* _dump_region; 822 823 public: 824 WriteClosure(DumpRegion* r) { 825 _dump_region = r; 826 } 827 828 void do_ptr(void** p) { 829 _dump_region->append_intptr_t((intptr_t)*p); 830 } 831 832 void do_u4(u4* p) { 833 void* ptr = (void*)(uintx(*p)); 834 do_ptr(&ptr); 835 } 836 837 void do_tag(int tag) { 838 _dump_region->append_intptr_t((intptr_t)tag); 839 } 840 841 void do_oop(oop* o) { 842 if (*o == NULL) { 843 _dump_region->append_intptr_t(0); 844 } else { 845 assert(MetaspaceShared::is_heap_object_archiving_allowed(), 846 "Archiving heap object is not allowed"); 847 _dump_region->append_intptr_t( 848 (intptr_t)CompressedOops::encode_not_null(*o)); 849 } 850 } 851 852 void do_region(u_char* start, size_t size) { 853 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment"); 854 assert(size % sizeof(intptr_t) == 0, "bad size"); 855 do_tag((int)size); 856 while (size > 0) { 857 _dump_region->append_intptr_t(*(intptr_t*)start); 858 start += sizeof(intptr_t); 859 size -= sizeof(intptr_t); 860 } 861 } 862 863 bool reading() const { return false; } 864 }; 865 866 // This is for dumping detailed statistics for the allocations 867 // in the shared spaces. 868 class DumpAllocStats : public ResourceObj { 869 public: 870 871 // Here's poor man's enum inheritance 872 #define SHAREDSPACE_OBJ_TYPES_DO(f) \ 873 METASPACE_OBJ_TYPES_DO(f) \ 874 f(SymbolHashentry) \ 875 f(SymbolBucket) \ 876 f(StringHashentry) \ 877 f(StringBucket) \ 878 f(Other) 879 880 enum Type { 881 // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc 882 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_DECLARE) 883 _number_of_types 884 }; 885 886 static const char * type_name(Type type) { 887 switch(type) { 888 SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_NAME_CASE) 889 default: 890 ShouldNotReachHere(); 891 return NULL; 892 } 893 } 894 895 public: 896 enum { RO = 0, RW = 1 }; 897 898 int _counts[2][_number_of_types]; 899 int _bytes [2][_number_of_types]; 900 901 DumpAllocStats() { 902 memset(_counts, 0, sizeof(_counts)); 903 memset(_bytes, 0, sizeof(_bytes)); 904 }; 905 906 void record(MetaspaceObj::Type type, int byte_size, bool read_only) { 907 assert(int(type) >= 0 && type < MetaspaceObj::_number_of_types, "sanity"); 908 int which = (read_only) ? RO : RW; 909 _counts[which][type] ++; 910 _bytes [which][type] += byte_size; 911 } 912 913 void record_other_type(int byte_size, bool read_only) { 914 int which = (read_only) ? RO : RW; 915 _bytes [which][OtherType] += byte_size; 916 } 917 void print_stats(int ro_all, int rw_all, int mc_all, int md_all); 918 }; 919 920 void DumpAllocStats::print_stats(int ro_all, int rw_all, int mc_all, int md_all) { 921 // Calculate size of data that was not allocated by Metaspace::allocate() 922 MetaspaceSharedStats *stats = MetaspaceShared::stats(); 923 924 // symbols 925 _counts[RO][SymbolHashentryType] = stats->symbol.hashentry_count; 926 _bytes [RO][SymbolHashentryType] = stats->symbol.hashentry_bytes; 927 928 _counts[RO][SymbolBucketType] = stats->symbol.bucket_count; 929 _bytes [RO][SymbolBucketType] = stats->symbol.bucket_bytes; 930 931 // strings 932 _counts[RO][StringHashentryType] = stats->string.hashentry_count; 933 _bytes [RO][StringHashentryType] = stats->string.hashentry_bytes; 934 935 _counts[RO][StringBucketType] = stats->string.bucket_count; 936 _bytes [RO][StringBucketType] = stats->string.bucket_bytes; 937 938 // TODO: count things like dictionary, vtable, etc 939 _bytes[RW][OtherType] += mc_all + md_all; 940 rw_all += mc_all + md_all; // mc/md are mapped Read/Write 941 942 // prevent divide-by-zero 943 if (ro_all < 1) { 944 ro_all = 1; 945 } 946 if (rw_all < 1) { 947 rw_all = 1; 948 } 949 950 int all_ro_count = 0; 951 int all_ro_bytes = 0; 952 int all_rw_count = 0; 953 int all_rw_bytes = 0; 954 955 // To make fmt_stats be a syntactic constant (for format warnings), use #define. 956 #define fmt_stats "%-20s: %8d %10d %5.1f | %8d %10d %5.1f | %8d %10d %5.1f" 957 const char *sep = "--------------------+---------------------------+---------------------------+--------------------------"; 958 const char *hdr = " ro_cnt ro_bytes % | rw_cnt rw_bytes % | all_cnt all_bytes %"; 959 960 LogMessage(cds) msg; 961 962 msg.info("Detailed metadata info (excluding od/st regions; rw stats include md/mc regions):"); 963 msg.info("%s", hdr); 964 msg.info("%s", sep); 965 for (int type = 0; type < int(_number_of_types); type ++) { 966 const char *name = type_name((Type)type); 967 int ro_count = _counts[RO][type]; 968 int ro_bytes = _bytes [RO][type]; 969 int rw_count = _counts[RW][type]; 970 int rw_bytes = _bytes [RW][type]; 971 int count = ro_count + rw_count; 972 int bytes = ro_bytes + rw_bytes; 973 974 double ro_perc = percent_of(ro_bytes, ro_all); 975 double rw_perc = percent_of(rw_bytes, rw_all); 976 double perc = percent_of(bytes, ro_all + rw_all); 977 978 msg.info(fmt_stats, name, 979 ro_count, ro_bytes, ro_perc, 980 rw_count, rw_bytes, rw_perc, 981 count, bytes, perc); 982 983 all_ro_count += ro_count; 984 all_ro_bytes += ro_bytes; 985 all_rw_count += rw_count; 986 all_rw_bytes += rw_bytes; 987 } 988 989 int all_count = all_ro_count + all_rw_count; 990 int all_bytes = all_ro_bytes + all_rw_bytes; 991 992 double all_ro_perc = percent_of(all_ro_bytes, ro_all); 993 double all_rw_perc = percent_of(all_rw_bytes, rw_all); 994 double all_perc = percent_of(all_bytes, ro_all + rw_all); 995 996 msg.info("%s", sep); 997 msg.info(fmt_stats, "Total", 998 all_ro_count, all_ro_bytes, all_ro_perc, 999 all_rw_count, all_rw_bytes, all_rw_perc, 1000 all_count, all_bytes, all_perc); 1001 1002 assert(all_ro_bytes == ro_all, "everything should have been counted"); 1003 assert(all_rw_bytes == rw_all, "everything should have been counted"); 1004 1005 #undef fmt_stats 1006 } 1007 1008 // Populate the shared space. 1009 1010 class VM_PopulateDumpSharedSpace: public VM_Operation { 1011 private: 1012 GrowableArray<MemRegion> *_closed_archive_heap_regions; 1013 GrowableArray<MemRegion> *_open_archive_heap_regions; 1014 1015 void dump_java_heap_objects() NOT_CDS_JAVA_HEAP_RETURN; 1016 void dump_symbols(); 1017 char* dump_read_only_tables(); 1018 void print_region_stats(); 1019 void print_heap_region_stats(GrowableArray<MemRegion> *heap_mem, 1020 const char *name, const size_t total_size); 1021 public: 1022 1023 VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; } 1024 void doit(); // outline because gdb sucks 1025 static void write_region(FileMapInfo* mapinfo, int region, DumpRegion* space, bool read_only, bool allow_exec); 1026 bool allow_nested_vm_operations() const { return true; } 1027 }; // class VM_PopulateDumpSharedSpace 1028 1029 class SortedSymbolClosure: public SymbolClosure { 1030 GrowableArray<Symbol*> _symbols; 1031 virtual void do_symbol(Symbol** sym) { 1032 assert((*sym)->is_permanent(), "archived symbols must be permanent"); 1033 _symbols.append(*sym); 1034 } 1035 static int compare_symbols_by_address(Symbol** a, Symbol** b) { 1036 if (a[0] < b[0]) { 1037 return -1; 1038 } else if (a[0] == b[0]) { 1039 return 0; 1040 } else { 1041 return 1; 1042 } 1043 } 1044 1045 public: 1046 SortedSymbolClosure() { 1047 SymbolTable::symbols_do(this); 1048 _symbols.sort(compare_symbols_by_address); 1049 } 1050 GrowableArray<Symbol*>* get_sorted_symbols() { 1051 return &_symbols; 1052 } 1053 }; 1054 1055 // ArchiveCompactor -- 1056 // 1057 // This class is the central piece of shared archive compaction -- all metaspace data are 1058 // initially allocated outside of the shared regions. ArchiveCompactor copies the 1059 // metaspace data into their final location in the shared regions. 1060 1061 class ArchiveCompactor : AllStatic { 1062 static DumpAllocStats* _alloc_stats; 1063 static SortedSymbolClosure* _ssc; 1064 1065 static unsigned my_hash(const address& a) { 1066 return primitive_hash<address>(a); 1067 } 1068 static bool my_equals(const address& a0, const address& a1) { 1069 return primitive_equals<address>(a0, a1); 1070 } 1071 typedef ResourceHashtable< 1072 address, address, 1073 ArchiveCompactor::my_hash, // solaris compiler doesn't like: primitive_hash<address> 1074 ArchiveCompactor::my_equals, // solaris compiler doesn't like: primitive_equals<address> 1075 16384, ResourceObj::C_HEAP> RelocationTable; 1076 static RelocationTable* _new_loc_table; 1077 1078 public: 1079 static void initialize() { 1080 _alloc_stats = new(ResourceObj::C_HEAP, mtInternal)DumpAllocStats; 1081 _new_loc_table = new(ResourceObj::C_HEAP, mtInternal)RelocationTable; 1082 } 1083 static DumpAllocStats* alloc_stats() { 1084 return _alloc_stats; 1085 } 1086 1087 static void allocate(MetaspaceClosure::Ref* ref, bool read_only) { 1088 address obj = ref->obj(); 1089 int bytes = ref->size() * BytesPerWord; 1090 char* p; 1091 size_t alignment = BytesPerWord; 1092 char* oldtop; 1093 char* newtop; 1094 1095 if (read_only) { 1096 oldtop = _ro_region.top(); 1097 p = _ro_region.allocate(bytes, alignment); 1098 newtop = _ro_region.top(); 1099 } else { 1100 oldtop = _rw_region.top(); 1101 p = _rw_region.allocate(bytes, alignment); 1102 newtop = _rw_region.top(); 1103 } 1104 memcpy(p, obj, bytes); 1105 bool isnew = _new_loc_table->put(obj, (address)p); 1106 log_trace(cds)("Copy: " PTR_FORMAT " ==> " PTR_FORMAT " %d", p2i(obj), p2i(p), bytes); 1107 assert(isnew, "must be"); 1108 1109 _alloc_stats->record(ref->msotype(), int(newtop - oldtop), read_only); 1110 if (ref->msotype() == MetaspaceObj::SymbolType) { 1111 uintx delta = MetaspaceShared::object_delta(p); 1112 if (delta > MAX_SHARED_DELTA) { 1113 // This is just a sanity check and should not appear in any real world usage. This 1114 // happens only if you allocate more than 2GB of Symbols and would require 1115 // millions of shared classes. 1116 vm_exit_during_initialization("Too many Symbols in the CDS archive", 1117 "Please reduce the number of shared classes."); 1118 } 1119 } 1120 } 1121 1122 static address get_new_loc(MetaspaceClosure::Ref* ref) { 1123 address* pp = _new_loc_table->get(ref->obj()); 1124 assert(pp != NULL, "must be"); 1125 return *pp; 1126 } 1127 1128 private: 1129 // Makes a shallow copy of visited MetaspaceObj's 1130 class ShallowCopier: public UniqueMetaspaceClosure { 1131 bool _read_only; 1132 public: 1133 ShallowCopier(bool read_only) : _read_only(read_only) {} 1134 1135 virtual void do_unique_ref(Ref* ref, bool read_only) { 1136 if (read_only == _read_only) { 1137 allocate(ref, read_only); 1138 } 1139 } 1140 }; 1141 1142 // Relocate embedded pointers within a MetaspaceObj's shallow copy 1143 class ShallowCopyEmbeddedRefRelocator: public UniqueMetaspaceClosure { 1144 public: 1145 virtual void do_unique_ref(Ref* ref, bool read_only) { 1146 address new_loc = get_new_loc(ref); 1147 RefRelocator refer; 1148 ref->metaspace_pointers_do_at(&refer, new_loc); 1149 } 1150 }; 1151 1152 // Relocate a reference to point to its shallow copy 1153 class RefRelocator: public MetaspaceClosure { 1154 public: 1155 virtual bool do_ref(Ref* ref, bool read_only) { 1156 if (ref->not_null()) { 1157 ref->update(get_new_loc(ref)); 1158 } 1159 return false; // Do not recurse. 1160 } 1161 }; 1162 1163 #ifdef ASSERT 1164 class IsRefInArchiveChecker: public MetaspaceClosure { 1165 public: 1166 virtual bool do_ref(Ref* ref, bool read_only) { 1167 if (ref->not_null()) { 1168 char* obj = (char*)ref->obj(); 1169 assert(_ro_region.contains(obj) || _rw_region.contains(obj), 1170 "must be relocated to point to CDS archive"); 1171 } 1172 return false; // Do not recurse. 1173 } 1174 }; 1175 #endif 1176 1177 public: 1178 static void copy_and_compact() { 1179 // We should no longer allocate anything from the metaspace, so that 1180 // we can have a stable set of MetaspaceObjs to work with. 1181 Metaspace::freeze(); 1182 1183 ResourceMark rm; 1184 SortedSymbolClosure the_ssc; // StackObj 1185 _ssc = &the_ssc; 1186 1187 tty->print_cr("Scanning all metaspace objects ... "); 1188 { 1189 // allocate and shallow-copy RW objects, immediately following the MC region 1190 tty->print_cr("Allocating RW objects ... "); 1191 _mc_region.pack(&_rw_region); 1192 1193 ResourceMark rm; 1194 ShallowCopier rw_copier(false); 1195 iterate_roots(&rw_copier); 1196 } 1197 { 1198 // allocate and shallow-copy of RO object, immediately following the RW region 1199 tty->print_cr("Allocating RO objects ... "); 1200 _rw_region.pack(&_ro_region); 1201 1202 ResourceMark rm; 1203 ShallowCopier ro_copier(true); 1204 iterate_roots(&ro_copier); 1205 } 1206 { 1207 tty->print_cr("Relocating embedded pointers ... "); 1208 ResourceMark rm; 1209 ShallowCopyEmbeddedRefRelocator emb_reloc; 1210 iterate_roots(&emb_reloc); 1211 } 1212 { 1213 tty->print_cr("Relocating external roots ... "); 1214 ResourceMark rm; 1215 RefRelocator ext_reloc; 1216 iterate_roots(&ext_reloc); 1217 } 1218 1219 #ifdef ASSERT 1220 { 1221 tty->print_cr("Verifying external roots ... "); 1222 ResourceMark rm; 1223 IsRefInArchiveChecker checker; 1224 iterate_roots(&checker); 1225 } 1226 #endif 1227 1228 1229 // cleanup 1230 _ssc = NULL; 1231 } 1232 1233 // We must relocate the System::_well_known_klasses only after we have copied the 1234 // java objects in during dump_java_heap_objects(): during the object copy, we operate on 1235 // old objects which assert that their klass is the original klass. 1236 static void relocate_well_known_klasses() { 1237 { 1238 tty->print_cr("Relocating SystemDictionary::_well_known_klasses[] ... "); 1239 ResourceMark rm; 1240 RefRelocator ext_reloc; 1241 SystemDictionary::well_known_klasses_do(&ext_reloc); 1242 } 1243 // NOTE: after this point, we shouldn't have any globals that can reach the old 1244 // objects. 1245 1246 // We cannot use any of the objects in the heap anymore (except for the objects 1247 // in the CDS shared string regions) because their headers no longer point to 1248 // valid Klasses. 1249 } 1250 1251 static void iterate_roots(MetaspaceClosure* it) { 1252 GrowableArray<Symbol*>* symbols = _ssc->get_sorted_symbols(); 1253 for (int i=0; i<symbols->length(); i++) { 1254 it->push(symbols->adr_at(i)); 1255 } 1256 if (_global_klass_objects != NULL) { 1257 // Need to fix up the pointers 1258 for (int i = 0; i < _global_klass_objects->length(); i++) { 1259 // NOTE -- this requires that the vtable is NOT yet patched, or else we are hosed. 1260 it->push(_global_klass_objects->adr_at(i)); 1261 } 1262 } 1263 FileMapInfo::metaspace_pointers_do(it); 1264 SystemDictionary::classes_do(it); 1265 Universe::metaspace_pointers_do(it); 1266 SymbolTable::metaspace_pointers_do(it); 1267 vmSymbols::metaspace_pointers_do(it); 1268 } 1269 1270 static Klass* get_relocated_klass(Klass* orig_klass) { 1271 assert(DumpSharedSpaces, "dump time only"); 1272 address* pp = _new_loc_table->get((address)orig_klass); 1273 assert(pp != NULL, "must be"); 1274 Klass* klass = (Klass*)(*pp); 1275 assert(klass->is_klass(), "must be"); 1276 return klass; 1277 } 1278 }; 1279 1280 DumpAllocStats* ArchiveCompactor::_alloc_stats; 1281 SortedSymbolClosure* ArchiveCompactor::_ssc; 1282 ArchiveCompactor::RelocationTable* ArchiveCompactor::_new_loc_table; 1283 1284 void VM_PopulateDumpSharedSpace::write_region(FileMapInfo* mapinfo, int region_idx, 1285 DumpRegion* dump_region, bool read_only, bool allow_exec) { 1286 mapinfo->write_region(region_idx, dump_region->base(), dump_region->used(), read_only, allow_exec); 1287 } 1288 1289 void VM_PopulateDumpSharedSpace::dump_symbols() { 1290 tty->print_cr("Dumping symbol table ..."); 1291 1292 NOT_PRODUCT(SymbolTable::verify()); 1293 SymbolTable::write_to_archive(); 1294 } 1295 1296 char* VM_PopulateDumpSharedSpace::dump_read_only_tables() { 1297 char* oldtop = _ro_region.top(); 1298 // Reorder the system dictionary. Moving the symbols affects 1299 // how the hash table indices are calculated. 1300 SystemDictionary::reorder_dictionary_for_sharing(); 1301 1302 tty->print("Removing java_mirror ... "); 1303 if (!MetaspaceShared::is_heap_object_archiving_allowed()) { 1304 clear_basic_type_mirrors(); 1305 } 1306 remove_java_mirror_in_classes(); 1307 tty->print_cr("done. "); 1308 NOT_PRODUCT(SystemDictionary::verify();) 1309 1310 size_t buckets_bytes = SystemDictionary::count_bytes_for_buckets(); 1311 char* buckets_top = _ro_region.allocate(buckets_bytes, sizeof(intptr_t)); 1312 SystemDictionary::copy_buckets(buckets_top, _ro_region.top()); 1313 1314 size_t table_bytes = SystemDictionary::count_bytes_for_table(); 1315 char* table_top = _ro_region.allocate(table_bytes, sizeof(intptr_t)); 1316 SystemDictionary::copy_table(table_top, _ro_region.top()); 1317 1318 // Write the other data to the output array. 1319 WriteClosure wc(&_ro_region); 1320 MetaspaceShared::serialize(&wc); 1321 1322 char* newtop = _ro_region.top(); 1323 ArchiveCompactor::alloc_stats()->record_other_type(int(newtop - oldtop), true); 1324 return buckets_top; 1325 } 1326 1327 void VM_PopulateDumpSharedSpace::doit() { 1328 Thread* THREAD = VMThread::vm_thread(); 1329 1330 NOT_PRODUCT(SystemDictionary::verify();) 1331 // The following guarantee is meant to ensure that no loader constraints 1332 // exist yet, since the constraints table is not shared. This becomes 1333 // more important now that we don't re-initialize vtables/itables for 1334 // shared classes at runtime, where constraints were previously created. 1335 guarantee(SystemDictionary::constraints()->number_of_entries() == 0, 1336 "loader constraints are not saved"); 1337 guarantee(SystemDictionary::placeholders()->number_of_entries() == 0, 1338 "placeholders are not saved"); 1339 // Revisit and implement this if we prelink method handle call sites: 1340 guarantee(SystemDictionary::invoke_method_table() == NULL || 1341 SystemDictionary::invoke_method_table()->number_of_entries() == 0, 1342 "invoke method table is not saved"); 1343 1344 // At this point, many classes have been loaded. 1345 // Gather systemDictionary classes in a global array and do everything to 1346 // that so we don't have to walk the SystemDictionary again. 1347 _global_klass_objects = new GrowableArray<Klass*>(1000); 1348 CollectClassesClosure collect_classes; 1349 ClassLoaderDataGraph::loaded_classes_do(&collect_classes); 1350 1351 tty->print_cr("Number of classes %d", _global_klass_objects->length()); 1352 { 1353 int num_type_array = 0, num_obj_array = 0, num_inst = 0; 1354 for (int i = 0; i < _global_klass_objects->length(); i++) { 1355 Klass* k = _global_klass_objects->at(i); 1356 if (k->is_instance_klass()) { 1357 num_inst ++; 1358 } else if (k->is_objArray_klass()) { 1359 num_obj_array ++; 1360 } else { 1361 assert(k->is_typeArray_klass(), "sanity"); 1362 num_type_array ++; 1363 } 1364 } 1365 tty->print_cr(" instance classes = %5d", num_inst); 1366 tty->print_cr(" obj array classes = %5d", num_obj_array); 1367 tty->print_cr(" type array classes = %5d", num_type_array); 1368 } 1369 1370 // Ensure the ConstMethods won't be modified at run-time 1371 tty->print("Updating ConstMethods ... "); 1372 rewrite_nofast_bytecodes_and_calculate_fingerprints(); 1373 tty->print_cr("done. "); 1374 1375 // Move classes from platform/system dictionaries into the boot dictionary 1376 SystemDictionary::combine_shared_dictionaries(); 1377 1378 // Remove all references outside the metadata 1379 tty->print("Removing unshareable information ... "); 1380 remove_unshareable_in_classes(); 1381 tty->print_cr("done. "); 1382 1383 // We don't support archiving anonymous classes. Verify that they are not stored in 1384 // the any dictionaries. 1385 NOT_PRODUCT(assert_no_anonymoys_classes_in_dictionaries()); 1386 1387 SystemDictionaryShared::finalize_verification_constraints(); 1388 1389 ArchiveCompactor::initialize(); 1390 ArchiveCompactor::copy_and_compact(); 1391 1392 dump_symbols(); 1393 1394 // Dump supported java heap objects 1395 _closed_archive_heap_regions = NULL; 1396 _open_archive_heap_regions = NULL; 1397 dump_java_heap_objects(); 1398 1399 ArchiveCompactor::relocate_well_known_klasses(); 1400 1401 char* read_only_tables_start = dump_read_only_tables(); 1402 _ro_region.pack(&_md_region); 1403 1404 char* vtbl_list = _md_region.top(); 1405 MetaspaceShared::allocate_cpp_vtable_clones(); 1406 _md_region.pack(&_od_region); 1407 1408 // Relocate the archived class file data into the od region 1409 relocate_cached_class_file(); 1410 _od_region.pack(); 1411 1412 // The 5 core spaces are allocated consecutively mc->rw->ro->md->od, so there total size 1413 // is just the spaces between the two ends. 1414 size_t core_spaces_size = _od_region.end() - _mc_region.base(); 1415 assert(core_spaces_size == (size_t)align_up(core_spaces_size, Metaspace::reserve_alignment()), 1416 "should already be aligned"); 1417 1418 // During patching, some virtual methods may be called, so at this point 1419 // the vtables must contain valid methods (as filled in by CppVtableCloner::allocate). 1420 MetaspaceShared::patch_cpp_vtable_pointers(); 1421 1422 // The vtable clones contain addresses of the current process. 1423 // We don't want to write these addresses into the archive. 1424 MetaspaceShared::zero_cpp_vtable_clones_for_writing(); 1425 1426 // Create and write the archive file that maps the shared spaces. 1427 1428 FileMapInfo* mapinfo = new FileMapInfo(); 1429 mapinfo->populate_header(os::vm_allocation_granularity()); 1430 mapinfo->set_read_only_tables_start(read_only_tables_start); 1431 mapinfo->set_misc_data_patching_start(vtbl_list); 1432 mapinfo->set_cds_i2i_entry_code_buffers(MetaspaceShared::cds_i2i_entry_code_buffers()); 1433 mapinfo->set_cds_i2i_entry_code_buffers_size(MetaspaceShared::cds_i2i_entry_code_buffers_size()); 1434 mapinfo->set_core_spaces_size(core_spaces_size); 1435 1436 for (int pass=1; pass<=2; pass++) { 1437 if (pass == 1) { 1438 // The first pass doesn't actually write the data to disk. All it 1439 // does is to update the fields in the mapinfo->_header. 1440 } else { 1441 // After the first pass, the contents of mapinfo->_header are finalized, 1442 // so we can compute the header's CRC, and write the contents of the header 1443 // and the regions into disk. 1444 mapinfo->open_for_write(); 1445 mapinfo->set_header_crc(mapinfo->compute_header_crc()); 1446 } 1447 mapinfo->write_header(); 1448 1449 // NOTE: md contains the trampoline code for method entries, which are patched at run time, 1450 // so it needs to be read/write. 1451 write_region(mapinfo, MetaspaceShared::mc, &_mc_region, /*read_only=*/false,/*allow_exec=*/true); 1452 write_region(mapinfo, MetaspaceShared::rw, &_rw_region, /*read_only=*/false,/*allow_exec=*/false); 1453 write_region(mapinfo, MetaspaceShared::ro, &_ro_region, /*read_only=*/true, /*allow_exec=*/false); 1454 write_region(mapinfo, MetaspaceShared::md, &_md_region, /*read_only=*/false,/*allow_exec=*/false); 1455 write_region(mapinfo, MetaspaceShared::od, &_od_region, /*read_only=*/true, /*allow_exec=*/false); 1456 1457 _total_string_region_size = mapinfo->write_archive_heap_regions( 1458 _closed_archive_heap_regions, 1459 MetaspaceShared::first_string, 1460 MetaspaceShared::max_strings); 1461 _total_open_archive_region_size = mapinfo->write_archive_heap_regions( 1462 _open_archive_heap_regions, 1463 MetaspaceShared::first_open_archive_heap_region, 1464 MetaspaceShared::max_open_archive_heap_region); 1465 } 1466 1467 mapinfo->close(); 1468 1469 // Restore the vtable in case we invoke any virtual methods. 1470 MetaspaceShared::clone_cpp_vtables((intptr_t*)vtbl_list); 1471 1472 print_region_stats(); 1473 1474 if (log_is_enabled(Info, cds)) { 1475 ArchiveCompactor::alloc_stats()->print_stats(int(_ro_region.used()), int(_rw_region.used()), 1476 int(_mc_region.used()), int(_md_region.used())); 1477 } 1478 1479 if (PrintSystemDictionaryAtExit) { 1480 SystemDictionary::print(); 1481 } 1482 // There may be other pending VM operations that operate on the InstanceKlasses, 1483 // which will fail because InstanceKlasses::remove_unshareable_info() 1484 // has been called. Forget these operations and exit the VM directly. 1485 vm_direct_exit(0); 1486 } 1487 1488 void VM_PopulateDumpSharedSpace::print_region_stats() { 1489 // Print statistics of all the regions 1490 const size_t total_reserved = _ro_region.reserved() + _rw_region.reserved() + 1491 _mc_region.reserved() + _md_region.reserved() + 1492 _od_region.reserved() + 1493 _total_string_region_size + 1494 _total_open_archive_region_size; 1495 const size_t total_bytes = _ro_region.used() + _rw_region.used() + 1496 _mc_region.used() + _md_region.used() + 1497 _od_region.used() + 1498 _total_string_region_size + 1499 _total_open_archive_region_size; 1500 const double total_u_perc = percent_of(total_bytes, total_reserved); 1501 1502 _mc_region.print(total_reserved); 1503 _rw_region.print(total_reserved); 1504 _ro_region.print(total_reserved); 1505 _md_region.print(total_reserved); 1506 _od_region.print(total_reserved); 1507 print_heap_region_stats(_closed_archive_heap_regions, "st", total_reserved); 1508 print_heap_region_stats(_open_archive_heap_regions, "oa", total_reserved); 1509 1510 tty->print_cr("total : " SIZE_FORMAT_W(9) " [100.0%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used]", 1511 total_bytes, total_reserved, total_u_perc); 1512 } 1513 1514 void VM_PopulateDumpSharedSpace::print_heap_region_stats(GrowableArray<MemRegion> *heap_mem, 1515 const char *name, const size_t total_size) { 1516 int arr_len = heap_mem == NULL ? 0 : heap_mem->length(); 1517 for (int i = 0; i < arr_len; i++) { 1518 char* start = (char*)heap_mem->at(i).start(); 1519 size_t size = heap_mem->at(i).byte_size(); 1520 char* top = start + size; 1521 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, 1522 name, i, size, size/double(total_size)*100.0, size, p2i(start)); 1523 1524 } 1525 } 1526 1527 // Update a Java object to point its Klass* to the new location after 1528 // shared archive has been compacted. 1529 void MetaspaceShared::relocate_klass_ptr(oop o) { 1530 assert(DumpSharedSpaces, "sanity"); 1531 Klass* k = ArchiveCompactor::get_relocated_klass(o->klass()); 1532 o->set_klass(k); 1533 } 1534 1535 Klass* MetaspaceShared::get_relocated_klass(Klass *k) { 1536 assert(DumpSharedSpaces, "sanity"); 1537 return ArchiveCompactor::get_relocated_klass(k); 1538 } 1539 1540 class LinkSharedClassesClosure : public KlassClosure { 1541 Thread* THREAD; 1542 bool _made_progress; 1543 public: 1544 LinkSharedClassesClosure(Thread* thread) : THREAD(thread), _made_progress(false) {} 1545 1546 void reset() { _made_progress = false; } 1547 bool made_progress() const { return _made_progress; } 1548 1549 void do_klass(Klass* k) { 1550 if (k->is_instance_klass()) { 1551 InstanceKlass* ik = InstanceKlass::cast(k); 1552 // Link the class to cause the bytecodes to be rewritten and the 1553 // cpcache to be created. Class verification is done according 1554 // to -Xverify setting. 1555 _made_progress |= MetaspaceShared::try_link_class(ik, THREAD); 1556 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class"); 1557 1558 ik->constants()->resolve_class_constants(THREAD); 1559 } 1560 } 1561 }; 1562 1563 class CheckSharedClassesClosure : public KlassClosure { 1564 bool _made_progress; 1565 public: 1566 CheckSharedClassesClosure() : _made_progress(false) {} 1567 1568 void reset() { _made_progress = false; } 1569 bool made_progress() const { return _made_progress; } 1570 void do_klass(Klass* k) { 1571 if (k->is_instance_klass() && InstanceKlass::cast(k)->check_sharing_error_state()) { 1572 _made_progress = true; 1573 } 1574 } 1575 }; 1576 1577 void MetaspaceShared::check_shared_class_loader_type(Klass* k) { 1578 if (k->is_instance_klass()) { 1579 InstanceKlass* ik = InstanceKlass::cast(k); 1580 u2 loader_type = ik->loader_type(); 1581 ResourceMark rm; 1582 guarantee(loader_type != 0, 1583 "Class loader type is not set for this class %s", ik->name()->as_C_string()); 1584 } 1585 } 1586 1587 void MetaspaceShared::link_and_cleanup_shared_classes(TRAPS) { 1588 // We need to iterate because verification may cause additional classes 1589 // to be loaded. 1590 LinkSharedClassesClosure link_closure(THREAD); 1591 do { 1592 link_closure.reset(); 1593 ClassLoaderDataGraph::loaded_classes_do(&link_closure); 1594 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class"); 1595 } while (link_closure.made_progress()); 1596 1597 if (_has_error_classes) { 1598 // Mark all classes whose super class or interfaces failed verification. 1599 CheckSharedClassesClosure check_closure; 1600 do { 1601 // Not completely sure if we need to do this iteratively. Anyway, 1602 // we should come here only if there are unverifiable classes, which 1603 // shouldn't happen in normal cases. So better safe than sorry. 1604 check_closure.reset(); 1605 ClassLoaderDataGraph::loaded_classes_do(&check_closure); 1606 } while (check_closure.made_progress()); 1607 1608 if (IgnoreUnverifiableClassesDuringDump) { 1609 // This is useful when running JCK or SQE tests. You should not 1610 // enable this when running real apps. 1611 SystemDictionary::remove_classes_in_error_state(); 1612 } else { 1613 tty->print_cr("Please remove the unverifiable classes from your class list and try again"); 1614 exit(1); 1615 } 1616 } 1617 } 1618 1619 void MetaspaceShared::prepare_for_dumping() { 1620 Arguments::check_unsupported_dumping_properties(); 1621 ClassLoader::initialize_shared_path(); 1622 FileMapInfo::allocate_classpath_entry_table(); 1623 } 1624 1625 // Preload classes from a list, populate the shared spaces and dump to a 1626 // file. 1627 void MetaspaceShared::preload_and_dump(TRAPS) { 1628 { TraceTime timer("Dump Shared Spaces", TRACETIME_LOG(Info, startuptime)); 1629 ResourceMark rm; 1630 char class_list_path_str[JVM_MAXPATHLEN]; 1631 // Preload classes to be shared. 1632 // Should use some os:: method rather than fopen() here. aB. 1633 const char* class_list_path; 1634 if (SharedClassListFile == NULL) { 1635 // Construct the path to the class list (in jre/lib) 1636 // Walk up two directories from the location of the VM and 1637 // optionally tack on "lib" (depending on platform) 1638 os::jvm_path(class_list_path_str, sizeof(class_list_path_str)); 1639 for (int i = 0; i < 3; i++) { 1640 char *end = strrchr(class_list_path_str, *os::file_separator()); 1641 if (end != NULL) *end = '\0'; 1642 } 1643 int class_list_path_len = (int)strlen(class_list_path_str); 1644 if (class_list_path_len >= 3) { 1645 if (strcmp(class_list_path_str + class_list_path_len - 3, "lib") != 0) { 1646 if (class_list_path_len < JVM_MAXPATHLEN - 4) { 1647 jio_snprintf(class_list_path_str + class_list_path_len, 1648 sizeof(class_list_path_str) - class_list_path_len, 1649 "%slib", os::file_separator()); 1650 class_list_path_len += 4; 1651 } 1652 } 1653 } 1654 if (class_list_path_len < JVM_MAXPATHLEN - 10) { 1655 jio_snprintf(class_list_path_str + class_list_path_len, 1656 sizeof(class_list_path_str) - class_list_path_len, 1657 "%sclasslist", os::file_separator()); 1658 } 1659 class_list_path = class_list_path_str; 1660 } else { 1661 class_list_path = SharedClassListFile; 1662 } 1663 1664 tty->print_cr("Loading classes to share ..."); 1665 _has_error_classes = false; 1666 int class_count = preload_classes(class_list_path, THREAD); 1667 if (ExtraSharedClassListFile) { 1668 class_count += preload_classes(ExtraSharedClassListFile, THREAD); 1669 } 1670 tty->print_cr("Loading classes to share: done."); 1671 1672 log_info(cds)("Shared spaces: preloaded %d classes", class_count); 1673 1674 // Rewrite and link classes 1675 tty->print_cr("Rewriting and linking classes ..."); 1676 1677 // Link any classes which got missed. This would happen if we have loaded classes that 1678 // were not explicitly specified in the classlist. E.g., if an interface implemented by class K 1679 // fails verification, all other interfaces that were not specified in the classlist but 1680 // are implemented by K are not verified. 1681 link_and_cleanup_shared_classes(CATCH); 1682 tty->print_cr("Rewriting and linking classes: done"); 1683 1684 SystemDictionary::clear_invoke_method_table(); 1685 1686 VM_PopulateDumpSharedSpace op; 1687 VMThread::execute(&op); 1688 } 1689 } 1690 1691 1692 int MetaspaceShared::preload_classes(const char* class_list_path, TRAPS) { 1693 ClassListParser parser(class_list_path); 1694 int class_count = 0; 1695 1696 while (parser.parse_one_line()) { 1697 Klass* klass = ClassLoaderExt::load_one_class(&parser, THREAD); 1698 if (HAS_PENDING_EXCEPTION) { 1699 if (klass == NULL && 1700 (PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_ClassNotFoundException())) { 1701 // print a warning only when the pending exception is class not found 1702 tty->print_cr("Preload Warning: Cannot find %s", parser.current_class_name()); 1703 } 1704 CLEAR_PENDING_EXCEPTION; 1705 } 1706 if (klass != NULL) { 1707 if (log_is_enabled(Trace, cds)) { 1708 ResourceMark rm; 1709 log_trace(cds)("Shared spaces preloaded: %s", klass->external_name()); 1710 } 1711 1712 if (klass->is_instance_klass()) { 1713 InstanceKlass* ik = InstanceKlass::cast(klass); 1714 1715 // Link the class to cause the bytecodes to be rewritten and the 1716 // cpcache to be created. The linking is done as soon as classes 1717 // are loaded in order that the related data structures (klass and 1718 // cpCache) are located together. 1719 try_link_class(ik, THREAD); 1720 guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class"); 1721 } 1722 1723 class_count++; 1724 } 1725 } 1726 1727 return class_count; 1728 } 1729 1730 // Returns true if the class's status has changed 1731 bool MetaspaceShared::try_link_class(InstanceKlass* ik, TRAPS) { 1732 assert(DumpSharedSpaces, "should only be called during dumping"); 1733 if (ik->init_state() < InstanceKlass::linked) { 1734 bool saved = BytecodeVerificationLocal; 1735 if (!(ik->is_shared_boot_class())) { 1736 // The verification decision is based on BytecodeVerificationRemote 1737 // for non-system classes. Since we are using the NULL classloader 1738 // to load non-system classes during dumping, we need to temporarily 1739 // change BytecodeVerificationLocal to be the same as 1740 // BytecodeVerificationRemote. Note this can cause the parent system 1741 // classes also being verified. The extra overhead is acceptable during 1742 // dumping. 1743 BytecodeVerificationLocal = BytecodeVerificationRemote; 1744 } 1745 ik->link_class(THREAD); 1746 if (HAS_PENDING_EXCEPTION) { 1747 ResourceMark rm; 1748 tty->print_cr("Preload Warning: Verification failed for %s", 1749 ik->external_name()); 1750 CLEAR_PENDING_EXCEPTION; 1751 ik->set_in_error_state(); 1752 _has_error_classes = true; 1753 } 1754 BytecodeVerificationLocal = saved; 1755 return true; 1756 } else { 1757 return false; 1758 } 1759 } 1760 1761 #if INCLUDE_CDS_JAVA_HEAP 1762 void VM_PopulateDumpSharedSpace::dump_java_heap_objects() { 1763 if (!MetaspaceShared::is_heap_object_archiving_allowed()) { 1764 if (log_is_enabled(Info, cds)) { 1765 log_info(cds)( 1766 "Archived java heap is not supported as UseG1GC, " 1767 "UseCompressedOops and UseCompressedClassPointers are required." 1768 "Current settings: UseG1GC=%s, UseCompressedOops=%s, UseCompressedClassPointers=%s.", 1769 BOOL_TO_STR(UseG1GC), BOOL_TO_STR(UseCompressedOops), 1770 BOOL_TO_STR(UseCompressedClassPointers)); 1771 } 1772 return; 1773 } 1774 1775 { 1776 NoSafepointVerifier nsv; 1777 1778 // Cache for recording where the archived objects are copied to 1779 MetaspaceShared::create_archive_object_cache(); 1780 1781 tty->print_cr("Dumping objects to closed archive heap region ..."); 1782 NOT_PRODUCT(StringTable::verify()); 1783 // The closed space has maximum two regions. See FileMapInfo::write_archive_heap_regions() for details. 1784 _closed_archive_heap_regions = new GrowableArray<MemRegion>(2); 1785 MetaspaceShared::dump_closed_archive_heap_objects(_closed_archive_heap_regions); 1786 1787 tty->print_cr("Dumping objects to open archive heap region ..."); 1788 _open_archive_heap_regions = new GrowableArray<MemRegion>(2); 1789 MetaspaceShared::dump_open_archive_heap_objects(_open_archive_heap_regions); 1790 1791 MetaspaceShared::destroy_archive_object_cache(); 1792 } 1793 1794 G1HeapVerifier::verify_archive_regions(); 1795 } 1796 1797 void MetaspaceShared::dump_closed_archive_heap_objects( 1798 GrowableArray<MemRegion> * closed_archive) { 1799 assert(is_heap_object_archiving_allowed(), "Cannot dump java heap objects"); 1800 1801 Thread* THREAD = Thread::current(); 1802 G1CollectedHeap::heap()->begin_archive_alloc_range(); 1803 1804 // Archive interned string objects 1805 StringTable::write_to_archive(closed_archive); 1806 1807 G1CollectedHeap::heap()->end_archive_alloc_range(closed_archive, 1808 os::vm_allocation_granularity()); 1809 } 1810 1811 void MetaspaceShared::dump_open_archive_heap_objects( 1812 GrowableArray<MemRegion> * open_archive) { 1813 assert(UseG1GC, "Only support G1 GC"); 1814 assert(UseCompressedOops && UseCompressedClassPointers, 1815 "Only support UseCompressedOops and UseCompressedClassPointers enabled"); 1816 1817 Thread* THREAD = Thread::current(); 1818 G1CollectedHeap::heap()->begin_archive_alloc_range(true /* open */); 1819 1820 java_lang_Class::archive_basic_type_mirrors(THREAD); 1821 1822 MetaspaceShared::archive_klass_objects(THREAD); 1823 1824 G1CollectedHeap::heap()->end_archive_alloc_range(open_archive, 1825 os::vm_allocation_granularity()); 1826 } 1827 1828 unsigned MetaspaceShared::obj_hash(oop const& p) { 1829 assert(!p->mark()->has_bias_pattern(), 1830 "this object should never have been locked"); // so identity_hash won't safepoin 1831 unsigned hash = (unsigned)p->identity_hash(); 1832 return hash; 1833 } 1834 1835 MetaspaceShared::ArchivedObjectCache* MetaspaceShared::_archive_object_cache = NULL; 1836 oop MetaspaceShared::find_archived_heap_object(oop obj) { 1837 assert(DumpSharedSpaces, "dump-time only"); 1838 ArchivedObjectCache* cache = MetaspaceShared::archive_object_cache(); 1839 oop* p = cache->get(obj); 1840 if (p != NULL) { 1841 return *p; 1842 } else { 1843 return NULL; 1844 } 1845 } 1846 1847 oop MetaspaceShared::archive_heap_object(oop obj, Thread* THREAD) { 1848 assert(DumpSharedSpaces, "dump-time only"); 1849 1850 oop ao = find_archived_heap_object(obj); 1851 if (ao != NULL) { 1852 // already archived 1853 return ao; 1854 } 1855 1856 int len = obj->size(); 1857 if (G1CollectedHeap::heap()->is_archive_alloc_too_large(len)) { 1858 return NULL; 1859 } 1860 1861 int hash = obj->identity_hash(); 1862 oop archived_oop = (oop)G1CollectedHeap::heap()->archive_mem_allocate(len); 1863 if (archived_oop != NULL) { 1864 Copy::aligned_disjoint_words((HeapWord*)obj, (HeapWord*)archived_oop, len); 1865 relocate_klass_ptr(archived_oop); 1866 ArchivedObjectCache* cache = MetaspaceShared::archive_object_cache(); 1867 cache->put(obj, archived_oop); 1868 } 1869 log_debug(cds)("Archived heap object " PTR_FORMAT " ==> " PTR_FORMAT, 1870 p2i(obj), p2i(archived_oop)); 1871 return archived_oop; 1872 } 1873 1874 void MetaspaceShared::archive_klass_objects(Thread* THREAD) { 1875 int i; 1876 for (i = 0; i < _global_klass_objects->length(); i++) { 1877 Klass* k = _global_klass_objects->at(i); 1878 1879 // archive mirror object 1880 java_lang_Class::archive_mirror(k, CHECK); 1881 1882 // archive the resolved_referenes array 1883 if (k->is_instance_klass()) { 1884 InstanceKlass* ik = InstanceKlass::cast(k); 1885 ik->constants()->archive_resolved_references(THREAD); 1886 } 1887 } 1888 } 1889 1890 void MetaspaceShared::fixup_mapped_heap_regions() { 1891 FileMapInfo *mapinfo = FileMapInfo::current_info(); 1892 mapinfo->fixup_mapped_heap_regions(); 1893 } 1894 #endif // INCLUDE_CDS_JAVA_HEAP 1895 1896 // Closure for serializing initialization data in from a data area 1897 // (ptr_array) read from the shared file. 1898 1899 class ReadClosure : public SerializeClosure { 1900 private: 1901 intptr_t** _ptr_array; 1902 1903 inline intptr_t nextPtr() { 1904 return *(*_ptr_array)++; 1905 } 1906 1907 public: 1908 ReadClosure(intptr_t** ptr_array) { _ptr_array = ptr_array; } 1909 1910 void do_ptr(void** p) { 1911 assert(*p == NULL, "initializing previous initialized pointer."); 1912 intptr_t obj = nextPtr(); 1913 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100, 1914 "hit tag while initializing ptrs."); 1915 *p = (void*)obj; 1916 } 1917 1918 void do_u4(u4* p) { 1919 intptr_t obj = nextPtr(); 1920 *p = (u4)(uintx(obj)); 1921 } 1922 1923 void do_tag(int tag) { 1924 int old_tag; 1925 old_tag = (int)(intptr_t)nextPtr(); 1926 // do_int(&old_tag); 1927 assert(tag == old_tag, "old tag doesn't match"); 1928 FileMapInfo::assert_mark(tag == old_tag); 1929 } 1930 1931 void do_oop(oop *p) { 1932 narrowOop o = (narrowOop)nextPtr(); 1933 if (o == 0 || !MetaspaceShared::open_archive_heap_region_mapped()) { 1934 p = NULL; 1935 } else { 1936 assert(MetaspaceShared::is_heap_object_archiving_allowed(), 1937 "Archived heap object is not allowed"); 1938 assert(MetaspaceShared::open_archive_heap_region_mapped(), 1939 "Open archive heap region is not mapped"); 1940 RootAccess<IN_ARCHIVE_ROOT>::oop_store(p, CompressedOops::decode(o)); 1941 } 1942 } 1943 1944 void do_region(u_char* start, size_t size) { 1945 assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment"); 1946 assert(size % sizeof(intptr_t) == 0, "bad size"); 1947 do_tag((int)size); 1948 while (size > 0) { 1949 *(intptr_t*)start = nextPtr(); 1950 start += sizeof(intptr_t); 1951 size -= sizeof(intptr_t); 1952 } 1953 } 1954 1955 bool reading() const { return true; } 1956 }; 1957 1958 // Return true if given address is in the misc data region 1959 bool MetaspaceShared::is_in_shared_region(const void* p, int idx) { 1960 return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_region(p, idx); 1961 } 1962 1963 bool MetaspaceShared::is_in_trampoline_frame(address addr) { 1964 if (UseSharedSpaces && is_in_shared_region(addr, MetaspaceShared::mc)) { 1965 return true; 1966 } 1967 return false; 1968 } 1969 1970 void MetaspaceShared::print_shared_spaces() { 1971 if (UseSharedSpaces) { 1972 FileMapInfo::current_info()->print_shared_spaces(); 1973 } 1974 } 1975 1976 1977 // Map shared spaces at requested addresses and return if succeeded. 1978 bool MetaspaceShared::map_shared_spaces(FileMapInfo* mapinfo) { 1979 size_t image_alignment = mapinfo->alignment(); 1980 1981 #ifndef _WINDOWS 1982 // Map in the shared memory and then map the regions on top of it. 1983 // On Windows, don't map the memory here because it will cause the 1984 // mappings of the regions to fail. 1985 ReservedSpace shared_rs = mapinfo->reserve_shared_memory(); 1986 if (!shared_rs.is_reserved()) return false; 1987 #endif 1988 1989 assert(!DumpSharedSpaces, "Should not be called with DumpSharedSpaces"); 1990 1991 char* ro_base = NULL; char* ro_top; 1992 char* rw_base = NULL; char* rw_top; 1993 char* mc_base = NULL; char* mc_top; 1994 char* md_base = NULL; char* md_top; 1995 char* od_base = NULL; char* od_top; 1996 1997 // Map each shared region 1998 if ((mc_base = mapinfo->map_region(mc, &mc_top)) != NULL && 1999 (rw_base = mapinfo->map_region(rw, &rw_top)) != NULL && 2000 (ro_base = mapinfo->map_region(ro, &ro_top)) != NULL && 2001 (md_base = mapinfo->map_region(md, &md_top)) != NULL && 2002 (od_base = mapinfo->map_region(od, &od_top)) != NULL && 2003 (image_alignment == (size_t)os::vm_allocation_granularity()) && 2004 mapinfo->validate_classpath_entry_table()) { 2005 // Success -- set up MetaspaceObj::_shared_metaspace_{base,top} for 2006 // fast checking in MetaspaceShared::is_in_shared_metaspace() and 2007 // MetaspaceObj::is_shared(). 2008 // 2009 // We require that mc->rw->ro->md->od to be laid out consecutively, with no 2010 // gaps between them. That way, we can ensure that the OS won't be able to 2011 // allocate any new memory spaces inside _shared_metaspace_{base,top}, which 2012 // would mess up the simple comparision in MetaspaceShared::is_in_shared_metaspace(). 2013 assert(mc_base < ro_base && mc_base < rw_base && mc_base < md_base && mc_base < od_base, "must be"); 2014 assert(od_top > ro_top && od_top > rw_top && od_top > md_top && od_top > mc_top , "must be"); 2015 assert(mc_top == rw_base, "must be"); 2016 assert(rw_top == ro_base, "must be"); 2017 assert(ro_top == md_base, "must be"); 2018 assert(md_top == od_base, "must be"); 2019 2020 MetaspaceObj::_shared_metaspace_base = (void*)mc_base; 2021 MetaspaceObj::_shared_metaspace_top = (void*)od_top; 2022 return true; 2023 } else { 2024 // If there was a failure in mapping any of the spaces, unmap the ones 2025 // that succeeded 2026 if (ro_base != NULL) mapinfo->unmap_region(ro); 2027 if (rw_base != NULL) mapinfo->unmap_region(rw); 2028 if (mc_base != NULL) mapinfo->unmap_region(mc); 2029 if (md_base != NULL) mapinfo->unmap_region(md); 2030 if (od_base != NULL) mapinfo->unmap_region(od); 2031 #ifndef _WINDOWS 2032 // Release the entire mapped region 2033 shared_rs.release(); 2034 #endif 2035 // If -Xshare:on is specified, print out the error message and exit VM, 2036 // otherwise, set UseSharedSpaces to false and continue. 2037 if (RequireSharedSpaces || PrintSharedArchiveAndExit) { 2038 vm_exit_during_initialization("Unable to use shared archive.", "Failed map_region for using -Xshare:on."); 2039 } else { 2040 FLAG_SET_DEFAULT(UseSharedSpaces, false); 2041 } 2042 return false; 2043 } 2044 } 2045 2046 // Read the miscellaneous data from the shared file, and 2047 // serialize it out to its various destinations. 2048 2049 void MetaspaceShared::initialize_shared_spaces() { 2050 FileMapInfo *mapinfo = FileMapInfo::current_info(); 2051 _cds_i2i_entry_code_buffers = mapinfo->cds_i2i_entry_code_buffers(); 2052 _cds_i2i_entry_code_buffers_size = mapinfo->cds_i2i_entry_code_buffers_size(); 2053 _core_spaces_size = mapinfo->core_spaces_size(); 2054 char* buffer = mapinfo->misc_data_patching_start(); 2055 clone_cpp_vtables((intptr_t*)buffer); 2056 2057 // The rest of the data is now stored in the RW region 2058 buffer = mapinfo->read_only_tables_start(); 2059 int sharedDictionaryLen = *(intptr_t*)buffer; 2060 buffer += sizeof(intptr_t); 2061 int number_of_entries = *(intptr_t*)buffer; 2062 buffer += sizeof(intptr_t); 2063 SystemDictionary::set_shared_dictionary((HashtableBucket<mtClass>*)buffer, 2064 sharedDictionaryLen, 2065 number_of_entries); 2066 buffer += sharedDictionaryLen; 2067 2068 // The following data are the linked list elements 2069 // (HashtableEntry objects) for the shared dictionary table. 2070 2071 int len = *(intptr_t*)buffer; // skip over shared dictionary entries 2072 buffer += sizeof(intptr_t); 2073 buffer += len; 2074 2075 // Verify various attributes of the archive, plus initialize the 2076 // shared string/symbol tables 2077 intptr_t* array = (intptr_t*)buffer; 2078 ReadClosure rc(&array); 2079 serialize(&rc); 2080 2081 // Initialize the run-time symbol table. 2082 SymbolTable::create_table(); 2083 2084 // Close the mapinfo file 2085 mapinfo->close(); 2086 2087 if (PrintSharedArchiveAndExit) { 2088 if (PrintSharedDictionary) { 2089 tty->print_cr("\nShared classes:\n"); 2090 SystemDictionary::print_shared(tty); 2091 } 2092 if (_archive_loading_failed) { 2093 tty->print_cr("archive is invalid"); 2094 vm_exit(1); 2095 } else { 2096 tty->print_cr("archive is valid"); 2097 vm_exit(0); 2098 } 2099 } 2100 } 2101 2102 // JVM/TI RedefineClasses() support: 2103 bool MetaspaceShared::remap_shared_readonly_as_readwrite() { 2104 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 2105 2106 if (UseSharedSpaces) { 2107 // remap the shared readonly space to shared readwrite, private 2108 FileMapInfo* mapinfo = FileMapInfo::current_info(); 2109 if (!mapinfo->remap_shared_readonly_as_readwrite()) { 2110 return false; 2111 } 2112 _remapped_readwrite = true; 2113 } 2114 return true; 2115 } 2116 2117 void MetaspaceShared::report_out_of_space(const char* name, size_t needed_bytes) { 2118 // This is highly unlikely to happen on 64-bits because we have reserved a 4GB space. 2119 // On 32-bit we reserve only 256MB so you could run out of space with 100,000 classes 2120 // or so. 2121 _mc_region.print_out_of_space_msg(name, needed_bytes); 2122 _rw_region.print_out_of_space_msg(name, needed_bytes); 2123 _ro_region.print_out_of_space_msg(name, needed_bytes); 2124 _md_region.print_out_of_space_msg(name, needed_bytes); 2125 _od_region.print_out_of_space_msg(name, needed_bytes); 2126 2127 vm_exit_during_initialization(err_msg("Unable to allocate from '%s' region", name), 2128 "Please reduce the number of shared classes."); 2129 }