1 /* 2 * Copyright (c) 2003, 2025, 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 "cds/aotClassLocation.hpp" 26 #include "cds/aotLogging.hpp" 27 #include "cds/archiveBuilder.hpp" 28 #include "cds/archiveHeapLoader.inline.hpp" 29 #include "cds/archiveHeapWriter.hpp" 30 #include "cds/archiveUtils.inline.hpp" 31 #include "cds/cds_globals.hpp" 32 #include "cds/cdsConfig.hpp" 33 #include "cds/dynamicArchive.hpp" 34 #include "cds/filemap.hpp" 35 #include "cds/heapShared.hpp" 36 #include "cds/metaspaceShared.hpp" 37 #include "classfile/altHashing.hpp" 38 #include "classfile/classFileStream.hpp" 39 #include "classfile/classLoader.hpp" 40 #include "classfile/classLoader.inline.hpp" 41 #include "classfile/classLoaderData.inline.hpp" 42 #include "classfile/classLoaderExt.hpp" 43 #include "classfile/symbolTable.hpp" 44 #include "classfile/systemDictionaryShared.hpp" 45 #include "classfile/vmClasses.hpp" 46 #include "classfile/vmSymbols.hpp" 47 #include "compiler/compilerDefinitions.inline.hpp" 48 #include "jvm.h" 49 #include "logging/log.hpp" 50 #include "logging/logMessage.hpp" 51 #include "logging/logStream.hpp" 52 #include "memory/iterator.inline.hpp" 53 #include "memory/metadataFactory.hpp" 54 #include "memory/metaspaceClosure.hpp" 55 #include "memory/oopFactory.hpp" 56 #include "memory/universe.hpp" 57 #include "nmt/memTracker.hpp" 58 #include "oops/access.hpp" 59 #include "oops/compressedOops.hpp" 60 #include "oops/compressedOops.inline.hpp" 61 #include "oops/compressedKlass.hpp" 62 #include "oops/objArrayOop.hpp" 63 #include "oops/oop.inline.hpp" 64 #include "oops/trainingData.hpp" 65 #include "oops/typeArrayKlass.hpp" 66 #include "prims/jvmtiExport.hpp" 67 #include "runtime/arguments.hpp" 68 #include "runtime/globals_extension.hpp" 69 #include "runtime/java.hpp" 70 #include "runtime/javaCalls.hpp" 71 #include "runtime/mutexLocker.hpp" 72 #include "runtime/os.hpp" 73 #include "runtime/vm_version.hpp" 74 #include "utilities/align.hpp" 75 #include "utilities/bitMap.inline.hpp" 76 #include "utilities/classpathStream.hpp" 77 #include "utilities/defaultStream.hpp" 78 #include "utilities/ostream.hpp" 79 #if INCLUDE_G1GC 80 #include "gc/g1/g1CollectedHeap.hpp" 81 #include "gc/g1/g1HeapRegion.hpp" 82 #endif 83 84 # include <sys/stat.h> 85 # include <errno.h> 86 87 #ifndef O_BINARY // if defined (Win32) use binary files. 88 #define O_BINARY 0 // otherwise do nothing. 89 #endif 90 91 // Fill in the fileMapInfo structure with data about this VM instance. 92 93 // This method copies the vm version info into header_version. If the version is too 94 // long then a truncated version, which has a hash code appended to it, is copied. 95 // 96 // Using a template enables this method to verify that header_version is an array of 97 // length JVM_IDENT_MAX. This ensures that the code that writes to the CDS file and 98 // the code that reads the CDS file will both use the same size buffer. Hence, will 99 // use identical truncation. This is necessary for matching of truncated versions. 100 template <int N> static void get_header_version(char (&header_version) [N]) { 101 assert(N == JVM_IDENT_MAX, "Bad header_version size"); 102 103 const char *vm_version = VM_Version::internal_vm_info_string(); 104 const int version_len = (int)strlen(vm_version); 105 106 memset(header_version, 0, JVM_IDENT_MAX); 107 108 if (version_len < (JVM_IDENT_MAX-1)) { 109 strcpy(header_version, vm_version); 110 111 } else { 112 // Get the hash value. Use a static seed because the hash needs to return the same 113 // value over multiple jvm invocations. 114 uint32_t hash = AltHashing::halfsiphash_32(8191, (const uint8_t*)vm_version, version_len); 115 116 // Truncate the ident, saving room for the 8 hex character hash value. 117 strncpy(header_version, vm_version, JVM_IDENT_MAX-9); 118 119 // Append the hash code as eight hex digits. 120 os::snprintf_checked(&header_version[JVM_IDENT_MAX-9], 9, "%08x", hash); 121 header_version[JVM_IDENT_MAX-1] = 0; // Null terminate. 122 } 123 124 assert(header_version[JVM_IDENT_MAX-1] == 0, "must be"); 125 } 126 127 FileMapInfo::FileMapInfo(const char* full_path, bool is_static) : 128 _is_static(is_static), _file_open(false), _is_mapped(false), _fd(-1), _file_offset(0), 129 _full_path(full_path), _base_archive_name(nullptr), _header(nullptr) { 130 if (_is_static) { 131 assert(_current_info == nullptr, "must be singleton"); // not thread safe 132 _current_info = this; 133 } else { 134 assert(_dynamic_archive_info == nullptr, "must be singleton"); // not thread safe 135 _dynamic_archive_info = this; 136 } 137 } 138 139 FileMapInfo::~FileMapInfo() { 140 if (_is_static) { 141 assert(_current_info == this, "must be singleton"); // not thread safe 142 _current_info = nullptr; 143 } else { 144 assert(_dynamic_archive_info == this, "must be singleton"); // not thread safe 145 _dynamic_archive_info = nullptr; 146 } 147 148 if (_header != nullptr) { 149 os::free(_header); 150 } 151 152 if (_file_open) { 153 ::close(_fd); 154 } 155 } 156 157 void FileMapInfo::free_current_info() { 158 assert(CDSConfig::is_dumping_final_static_archive(), "only supported in this mode"); 159 assert(_current_info != nullptr, "sanity"); 160 delete _current_info; 161 assert(_current_info == nullptr, "sanity"); // Side effect expected from the above "delete" operator. 162 } 163 164 void FileMapInfo::populate_header(size_t core_region_alignment) { 165 assert(_header == nullptr, "Sanity check"); 166 size_t c_header_size; 167 size_t header_size; 168 size_t base_archive_name_size = 0; 169 size_t base_archive_name_offset = 0; 170 if (is_static()) { 171 c_header_size = sizeof(FileMapHeader); 172 header_size = c_header_size; 173 } else { 174 // dynamic header including base archive name for non-default base archive 175 c_header_size = sizeof(DynamicArchiveHeader); 176 header_size = c_header_size; 177 178 const char* default_base_archive_name = CDSConfig::default_archive_path(); 179 const char* current_base_archive_name = CDSConfig::input_static_archive_path(); 180 if (!os::same_files(current_base_archive_name, default_base_archive_name)) { 181 base_archive_name_size = strlen(current_base_archive_name) + 1; 182 header_size += base_archive_name_size; 183 base_archive_name_offset = c_header_size; 184 } 185 } 186 _header = (FileMapHeader*)os::malloc(header_size, mtInternal); 187 memset((void*)_header, 0, header_size); 188 _header->populate(this, 189 core_region_alignment, 190 header_size, 191 base_archive_name_size, 192 base_archive_name_offset); 193 } 194 195 void FileMapHeader::populate(FileMapInfo *info, size_t core_region_alignment, 196 size_t header_size, size_t base_archive_name_size, 197 size_t base_archive_name_offset) { 198 // 1. We require _generic_header._magic to be at the beginning of the file 199 // 2. FileMapHeader also assumes that _generic_header is at the beginning of the file 200 assert(offset_of(FileMapHeader, _generic_header) == 0, "must be"); 201 set_header_size((unsigned int)header_size); 202 set_base_archive_name_offset((unsigned int)base_archive_name_offset); 203 set_base_archive_name_size((unsigned int)base_archive_name_size); 204 if (CDSConfig::is_dumping_dynamic_archive()) { 205 set_magic(CDS_DYNAMIC_ARCHIVE_MAGIC); 206 } else if (CDSConfig::is_dumping_preimage_static_archive()) { 207 set_magic(CDS_PREIMAGE_ARCHIVE_MAGIC); 208 } else { 209 set_magic(CDS_ARCHIVE_MAGIC); 210 } 211 set_version(CURRENT_CDS_ARCHIVE_VERSION); 212 213 if (!info->is_static() && base_archive_name_size != 0) { 214 // copy base archive name 215 copy_base_archive_name(CDSConfig::input_static_archive_path()); 216 } 217 _core_region_alignment = core_region_alignment; 218 _obj_alignment = ObjectAlignmentInBytes; 219 _compact_strings = CompactStrings; 220 _compact_headers = UseCompactObjectHeaders; 221 if (CDSConfig::is_dumping_heap()) { 222 _narrow_oop_mode = CompressedOops::mode(); 223 _narrow_oop_base = CompressedOops::base(); 224 _narrow_oop_shift = CompressedOops::shift(); 225 } 226 _compressed_oops = UseCompressedOops; 227 _compressed_class_ptrs = UseCompressedClassPointers; 228 if (UseCompressedClassPointers) { 229 #ifdef _LP64 230 _narrow_klass_pointer_bits = CompressedKlassPointers::narrow_klass_pointer_bits(); 231 _narrow_klass_shift = ArchiveBuilder::precomputed_narrow_klass_shift(); 232 #endif 233 } else { 234 _narrow_klass_pointer_bits = _narrow_klass_shift = -1; 235 } 236 // Which JIT compier is used 237 _compiler_type = (u1)CompilerConfig::compiler_type(); 238 _type_profile_level = TypeProfileLevel; 239 _type_profile_args_limit = TypeProfileArgsLimit; 240 _type_profile_parms_limit = TypeProfileParmsLimit; 241 _type_profile_width = TypeProfileWidth; 242 _bci_profile_width = BciProfileWidth; 243 _profile_traps = ProfileTraps; 244 _type_profile_casts = TypeProfileCasts; 245 _spec_trap_limit_extra_entries = SpecTrapLimitExtraEntries; 246 _max_heap_size = MaxHeapSize; 247 _use_optimized_module_handling = CDSConfig::is_using_optimized_module_handling(); 248 _has_aot_linked_classes = CDSConfig::is_dumping_aot_linked_classes(); 249 _has_full_module_graph = CDSConfig::is_dumping_full_module_graph(); 250 _has_archived_packages = CDSConfig::is_dumping_packages(); 251 _has_archived_protection_domains = CDSConfig::is_dumping_protection_domains(); 252 _gc_kind = (int)Universe::heap()->kind(); 253 jio_snprintf(_gc_name, sizeof(_gc_name), Universe::heap()->name()); 254 255 // The following fields are for sanity checks for whether this archive 256 // will function correctly with this JVM and the bootclasspath it's 257 // invoked with. 258 259 // JVM version string ... changes on each build. 260 get_header_version(_jvm_ident); 261 262 _verify_local = BytecodeVerificationLocal; 263 _verify_remote = BytecodeVerificationRemote; 264 _has_platform_or_app_classes = AOTClassLocationConfig::dumptime()->has_platform_or_app_classes(); 265 _requested_base_address = (char*)SharedBaseAddress; 266 _mapped_base_address = (char*)SharedBaseAddress; 267 _allow_archiving_with_java_agent = AllowArchivingWithJavaAgent; 268 } 269 270 void FileMapHeader::copy_base_archive_name(const char* archive) { 271 assert(base_archive_name_size() != 0, "_base_archive_name_size not set"); 272 assert(base_archive_name_offset() != 0, "_base_archive_name_offset not set"); 273 assert(header_size() > sizeof(*this), "_base_archive_name_size not included in header size?"); 274 memcpy((char*)this + base_archive_name_offset(), archive, base_archive_name_size()); 275 } 276 277 void FileMapHeader::print(outputStream* st) { 278 ResourceMark rm; 279 280 st->print_cr("- magic: 0x%08x", magic()); 281 st->print_cr("- crc: 0x%08x", crc()); 282 st->print_cr("- version: 0x%x", version()); 283 st->print_cr("- header_size: " UINT32_FORMAT, header_size()); 284 st->print_cr("- base_archive_name_offset: " UINT32_FORMAT, base_archive_name_offset()); 285 st->print_cr("- base_archive_name_size: " UINT32_FORMAT, base_archive_name_size()); 286 287 for (int i = 0; i < NUM_CDS_REGIONS; i++) { 288 FileMapRegion* r = region_at(i); 289 r->print(st, i); 290 } 291 st->print_cr("============ end regions ======== "); 292 293 st->print_cr("- core_region_alignment: %zu", _core_region_alignment); 294 st->print_cr("- obj_alignment: %d", _obj_alignment); 295 st->print_cr("- narrow_oop_base: " INTPTR_FORMAT, p2i(_narrow_oop_base)); 296 st->print_cr("- narrow_oop_shift %d", _narrow_oop_shift); 297 st->print_cr("- compact_strings: %d", _compact_strings); 298 st->print_cr("- compact_headers: %d", _compact_headers); 299 st->print_cr("- max_heap_size: %zu", _max_heap_size); 300 st->print_cr("- narrow_oop_mode: %d", _narrow_oop_mode); 301 st->print_cr("- compressed_oops: %d", _compressed_oops); 302 st->print_cr("- compressed_class_ptrs: %d", _compressed_class_ptrs); 303 st->print_cr("- narrow_klass_pointer_bits: %d", _narrow_klass_pointer_bits); 304 st->print_cr("- narrow_klass_shift: %d", _narrow_klass_shift); 305 st->print_cr("- cloned_vtables_offset: 0x%zx", _cloned_vtables_offset); 306 st->print_cr("- early_serialized_data_offset: 0x%zx", _early_serialized_data_offset); 307 st->print_cr("- serialized_data_offset: 0x%zx", _serialized_data_offset); 308 st->print_cr("- jvm_ident: %s", _jvm_ident); 309 st->print_cr("- class_location_config_offset: 0x%zx", _class_location_config_offset); 310 st->print_cr("- verify_local: %d", _verify_local); 311 st->print_cr("- verify_remote: %d", _verify_remote); 312 st->print_cr("- has_platform_or_app_classes: %d", _has_platform_or_app_classes); 313 st->print_cr("- requested_base_address: " INTPTR_FORMAT, p2i(_requested_base_address)); 314 st->print_cr("- mapped_base_address: " INTPTR_FORMAT, p2i(_mapped_base_address)); 315 st->print_cr("- heap_root_segments.roots_count: %d" , _heap_root_segments.roots_count()); 316 st->print_cr("- heap_root_segments.base_offset: 0x%zx", _heap_root_segments.base_offset()); 317 st->print_cr("- heap_root_segments.count: %zu", _heap_root_segments.count()); 318 st->print_cr("- heap_root_segments.max_size_elems: %d", _heap_root_segments.max_size_in_elems()); 319 st->print_cr("- heap_root_segments.max_size_bytes: %d", _heap_root_segments.max_size_in_bytes()); 320 st->print_cr("- _heap_oopmap_start_pos: %zu", _heap_oopmap_start_pos); 321 st->print_cr("- _heap_ptrmap_start_pos: %zu", _heap_ptrmap_start_pos); 322 st->print_cr("- _rw_ptrmap_start_pos: %zu", _rw_ptrmap_start_pos); 323 st->print_cr("- _ro_ptrmap_start_pos: %zu", _ro_ptrmap_start_pos); 324 st->print_cr("- allow_archiving_with_java_agent:%d", _allow_archiving_with_java_agent); 325 st->print_cr("- use_optimized_module_handling: %d", _use_optimized_module_handling); 326 st->print_cr("- has_full_module_graph %d", _has_full_module_graph); 327 st->print_cr("- has_aot_linked_classes %d", _has_aot_linked_classes); 328 st->print_cr("- has_archived_packages %d", _has_archived_packages); 329 st->print_cr("- has_archived_protection_domains %d", _has_archived_protection_domains); 330 st->print_cr("- ptrmap_size_in_bits: %zu", _ptrmap_size_in_bits); 331 } 332 333 bool FileMapInfo::validate_class_location() { 334 assert(CDSConfig::is_using_archive(), "runtime only"); 335 336 AOTClassLocationConfig* config = header()->class_location_config(); 337 bool has_extra_module_paths = false; 338 if (!config->validate(header()->has_aot_linked_classes(), &has_extra_module_paths)) { 339 if (PrintSharedArchiveAndExit) { 340 MetaspaceShared::set_archive_loading_failed(); 341 return true; 342 } else { 343 return false; 344 } 345 } 346 347 if (header()->has_full_module_graph() && has_extra_module_paths) { 348 CDSConfig::stop_using_optimized_module_handling(); 349 MetaspaceShared::report_loading_error("optimized module handling: disabled because extra module path(s) are specified"); 350 } 351 352 if (CDSConfig::is_dumping_dynamic_archive()) { 353 // Only support dynamic dumping with the usage of the default CDS archive 354 // or a simple base archive. 355 // If the base layer archive contains additional path component besides 356 // the runtime image and the -cp, dynamic dumping is disabled. 357 if (config->num_boot_classpaths() > 0) { 358 CDSConfig::disable_dumping_dynamic_archive(); 359 aot_log_warning(aot)( 360 "Dynamic archiving is disabled because base layer archive has appended boot classpath"); 361 } 362 if (config->num_module_paths() > 0) { 363 if (has_extra_module_paths) { 364 CDSConfig::disable_dumping_dynamic_archive(); 365 aot_log_warning(aot)( 366 "Dynamic archiving is disabled because base layer archive has a different module path"); 367 } 368 } 369 } 370 371 #if INCLUDE_JVMTI 372 if (_classpath_entries_for_jvmti != nullptr) { 373 os::free(_classpath_entries_for_jvmti); 374 } 375 size_t sz = sizeof(ClassPathEntry*) * AOTClassLocationConfig::runtime()->length(); 376 _classpath_entries_for_jvmti = (ClassPathEntry**)os::malloc(sz, mtClass); 377 memset((void*)_classpath_entries_for_jvmti, 0, sz); 378 #endif 379 380 return true; 381 } 382 383 // A utility class for reading/validating the GenericCDSFileMapHeader portion of 384 // a CDS archive's header. The file header of all CDS archives with versions from 385 // CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION (12) are guaranteed to always start 386 // with GenericCDSFileMapHeader. This makes it possible to read important information 387 // from a CDS archive created by a different version of HotSpot, so that we can 388 // automatically regenerate the archive as necessary (JDK-8261455). 389 class FileHeaderHelper { 390 int _fd; 391 bool _is_valid; 392 bool _is_static; 393 GenericCDSFileMapHeader* _header; 394 const char* _archive_name; 395 const char* _base_archive_name; 396 397 public: 398 FileHeaderHelper(const char* archive_name, bool is_static) { 399 _fd = -1; 400 _is_valid = false; 401 _header = nullptr; 402 _base_archive_name = nullptr; 403 _archive_name = archive_name; 404 _is_static = is_static; 405 } 406 407 ~FileHeaderHelper() { 408 if (_header != nullptr) { 409 FREE_C_HEAP_ARRAY(char, _header); 410 } 411 if (_fd != -1) { 412 ::close(_fd); 413 } 414 } 415 416 bool initialize() { 417 assert(_archive_name != nullptr, "Archive name is null"); 418 _fd = os::open(_archive_name, O_RDONLY | O_BINARY, 0); 419 if (_fd < 0) { 420 aot_log_info(aot)("Specified %s not found (%s)", CDSConfig::type_of_archive_being_loaded(), _archive_name); 421 return false; 422 } 423 return initialize(_fd); 424 } 425 426 // for an already opened file, do not set _fd 427 bool initialize(int fd) { 428 assert(_archive_name != nullptr, "Archive name is null"); 429 assert(fd != -1, "Archive must be opened already"); 430 // First read the generic header so we know the exact size of the actual header. 431 const char* file_type = CDSConfig::type_of_archive_being_loaded(); 432 GenericCDSFileMapHeader gen_header; 433 size_t size = sizeof(GenericCDSFileMapHeader); 434 os::lseek(fd, 0, SEEK_SET); 435 size_t n = ::read(fd, (void*)&gen_header, (unsigned int)size); 436 if (n != size) { 437 aot_log_warning(aot)("Unable to read generic CDS file map header from %s", file_type); 438 return false; 439 } 440 441 if (gen_header._magic != CDS_ARCHIVE_MAGIC && 442 gen_header._magic != CDS_DYNAMIC_ARCHIVE_MAGIC && 443 gen_header._magic != CDS_PREIMAGE_ARCHIVE_MAGIC) { 444 aot_log_warning(aot)("The %s has a bad magic number: %#x", file_type, gen_header._magic); 445 return false; 446 } 447 448 if (gen_header._version < CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION) { 449 aot_log_warning(aot)("Cannot handle %s version 0x%x. Must be at least 0x%x.", 450 file_type, gen_header._version, CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION); 451 return false; 452 } 453 454 if (gen_header._version != CURRENT_CDS_ARCHIVE_VERSION) { 455 aot_log_warning(aot)("The %s version 0x%x does not match the required version 0x%x.", 456 file_type, gen_header._version, CURRENT_CDS_ARCHIVE_VERSION); 457 } 458 459 size_t filelen = os::lseek(fd, 0, SEEK_END); 460 if (gen_header._header_size >= filelen) { 461 aot_log_warning(aot)("Archive file header larger than archive file"); 462 return false; 463 } 464 465 // Read the actual header and perform more checks 466 size = gen_header._header_size; 467 _header = (GenericCDSFileMapHeader*)NEW_C_HEAP_ARRAY(char, size, mtInternal); 468 os::lseek(fd, 0, SEEK_SET); 469 n = ::read(fd, (void*)_header, (unsigned int)size); 470 if (n != size) { 471 aot_log_warning(aot)("Unable to read file map header from %s", file_type); 472 return false; 473 } 474 475 if (!check_header_crc()) { 476 return false; 477 } 478 479 if (!check_and_init_base_archive_name()) { 480 return false; 481 } 482 483 // All fields in the GenericCDSFileMapHeader has been validated. 484 _is_valid = true; 485 return true; 486 } 487 488 GenericCDSFileMapHeader* get_generic_file_header() { 489 assert(_header != nullptr && _is_valid, "must be a valid archive file"); 490 return _header; 491 } 492 493 const char* base_archive_name() { 494 assert(_header != nullptr && _is_valid, "must be a valid archive file"); 495 return _base_archive_name; 496 } 497 498 bool is_static_archive() const { 499 return _header->_magic == CDS_ARCHIVE_MAGIC; 500 } 501 502 bool is_dynamic_archive() const { 503 return _header->_magic == CDS_DYNAMIC_ARCHIVE_MAGIC; 504 } 505 506 bool is_preimage_static_archive() const { 507 return _header->_magic == CDS_PREIMAGE_ARCHIVE_MAGIC; 508 } 509 510 private: 511 bool check_header_crc() const { 512 if (VerifySharedSpaces) { 513 FileMapHeader* header = (FileMapHeader*)_header; 514 int actual_crc = header->compute_crc(); 515 if (actual_crc != header->crc()) { 516 aot_log_info(aot)("_crc expected: %d", header->crc()); 517 aot_log_info(aot)(" actual: %d", actual_crc); 518 aot_log_warning(aot)("Header checksum verification failed."); 519 return false; 520 } 521 } 522 return true; 523 } 524 525 bool check_and_init_base_archive_name() { 526 unsigned int name_offset = _header->_base_archive_name_offset; 527 unsigned int name_size = _header->_base_archive_name_size; 528 unsigned int header_size = _header->_header_size; 529 530 if (name_offset + name_size < name_offset) { 531 aot_log_warning(aot)("base_archive_name offset/size overflow: " UINT32_FORMAT "/" UINT32_FORMAT, 532 name_offset, name_size); 533 return false; 534 } 535 536 if (is_static_archive() || is_preimage_static_archive()) { 537 if (name_offset != 0) { 538 aot_log_warning(aot)("static shared archive must have zero _base_archive_name_offset"); 539 return false; 540 } 541 if (name_size != 0) { 542 aot_log_warning(aot)("static shared archive must have zero _base_archive_name_size"); 543 return false; 544 } 545 } else { 546 assert(is_dynamic_archive(), "must be"); 547 if ((name_size == 0 && name_offset != 0) || 548 (name_size != 0 && name_offset == 0)) { 549 // If either is zero, both must be zero. This indicates that we are using the default base archive. 550 aot_log_warning(aot)("Invalid base_archive_name offset/size: " UINT32_FORMAT "/" UINT32_FORMAT, 551 name_offset, name_size); 552 return false; 553 } 554 if (name_size > 0) { 555 if (name_offset + name_size > header_size) { 556 aot_log_warning(aot)("Invalid base_archive_name offset/size (out of range): " 557 UINT32_FORMAT " + " UINT32_FORMAT " > " UINT32_FORMAT , 558 name_offset, name_size, header_size); 559 return false; 560 } 561 const char* name = ((const char*)_header) + _header->_base_archive_name_offset; 562 if (name[name_size - 1] != '\0' || strlen(name) != name_size - 1) { 563 aot_log_warning(aot)("Base archive name is damaged"); 564 return false; 565 } 566 if (!os::file_exists(name)) { 567 aot_log_warning(aot)("Base archive %s does not exist", name); 568 return false; 569 } 570 _base_archive_name = name; 571 } 572 } 573 574 return true; 575 } 576 }; 577 578 // Return value: 579 // false: 580 // <archive_name> is not a valid archive. *base_archive_name is set to null. 581 // true && (*base_archive_name) == nullptr: 582 // <archive_name> is a valid static archive. 583 // true && (*base_archive_name) != nullptr: 584 // <archive_name> is a valid dynamic archive. 585 bool FileMapInfo::get_base_archive_name_from_header(const char* archive_name, 586 const char** base_archive_name) { 587 FileHeaderHelper file_helper(archive_name, false); 588 *base_archive_name = nullptr; 589 590 if (!file_helper.initialize()) { 591 return false; 592 } 593 GenericCDSFileMapHeader* header = file_helper.get_generic_file_header(); 594 switch (header->_magic) { 595 case CDS_PREIMAGE_ARCHIVE_MAGIC: 596 return false; // This is a binary config file, not a proper archive 597 case CDS_DYNAMIC_ARCHIVE_MAGIC: 598 break; 599 default: 600 assert(header->_magic == CDS_ARCHIVE_MAGIC, "must be"); 601 if (AutoCreateSharedArchive) { 602 aot_log_warning(aot)("AutoCreateSharedArchive is ignored because %s is a static archive", archive_name); 603 } 604 return true; 605 } 606 607 const char* base = file_helper.base_archive_name(); 608 if (base == nullptr) { 609 *base_archive_name = CDSConfig::default_archive_path(); 610 } else { 611 *base_archive_name = os::strdup_check_oom(base); 612 } 613 614 return true; 615 } 616 617 bool FileMapInfo::is_preimage_static_archive(const char* file) { 618 FileHeaderHelper file_helper(file, false); 619 if (!file_helper.initialize()) { 620 return false; 621 } 622 return file_helper.is_preimage_static_archive(); 623 } 624 625 // Read the FileMapInfo information from the file. 626 627 bool FileMapInfo::init_from_file(int fd) { 628 FileHeaderHelper file_helper(_full_path, _is_static); 629 if (!file_helper.initialize(fd)) { 630 aot_log_warning(aot)("Unable to read the file header."); 631 return false; 632 } 633 GenericCDSFileMapHeader* gen_header = file_helper.get_generic_file_header(); 634 635 const char* file_type = CDSConfig::type_of_archive_being_loaded(); 636 if (_is_static) { 637 if ((gen_header->_magic == CDS_ARCHIVE_MAGIC) || 638 (gen_header->_magic == CDS_PREIMAGE_ARCHIVE_MAGIC && CDSConfig::is_dumping_final_static_archive())) { 639 // Good 640 } else { 641 if (CDSConfig::new_aot_flags_used()) { 642 aot_log_warning(aot)("Not a valid %s (%s)", file_type, _full_path); 643 } else { 644 aot_log_warning(aot)("Not a base shared archive: %s", _full_path); 645 } 646 return false; 647 } 648 } else { 649 if (gen_header->_magic != CDS_DYNAMIC_ARCHIVE_MAGIC) { 650 aot_log_warning(aot)("Not a top shared archive: %s", _full_path); 651 return false; 652 } 653 } 654 655 _header = (FileMapHeader*)os::malloc(gen_header->_header_size, mtInternal); 656 os::lseek(fd, 0, SEEK_SET); // reset to begin of the archive 657 size_t size = gen_header->_header_size; 658 size_t n = ::read(fd, (void*)_header, (unsigned int)size); 659 if (n != size) { 660 aot_log_warning(aot)("Failed to read file header from the top archive file\n"); 661 return false; 662 } 663 664 if (header()->version() != CURRENT_CDS_ARCHIVE_VERSION) { 665 aot_log_info(aot)("_version expected: 0x%x", CURRENT_CDS_ARCHIVE_VERSION); 666 aot_log_info(aot)(" actual: 0x%x", header()->version()); 667 aot_log_warning(aot)("The %s has the wrong version.", file_type); 668 return false; 669 } 670 671 unsigned int base_offset = header()->base_archive_name_offset(); 672 unsigned int name_size = header()->base_archive_name_size(); 673 unsigned int header_size = header()->header_size(); 674 if (base_offset != 0 && name_size != 0) { 675 if (header_size != base_offset + name_size) { 676 aot_log_info(aot)("_header_size: " UINT32_FORMAT, header_size); 677 aot_log_info(aot)("base_archive_name_size: " UINT32_FORMAT, header()->base_archive_name_size()); 678 aot_log_info(aot)("base_archive_name_offset: " UINT32_FORMAT, header()->base_archive_name_offset()); 679 aot_log_warning(aot)("The %s has an incorrect header size.", file_type); 680 return false; 681 } 682 } 683 684 const char* actual_ident = header()->jvm_ident(); 685 686 if (actual_ident[JVM_IDENT_MAX-1] != 0) { 687 aot_log_warning(aot)("JVM version identifier is corrupted."); 688 return false; 689 } 690 691 char expected_ident[JVM_IDENT_MAX]; 692 get_header_version(expected_ident); 693 if (strncmp(actual_ident, expected_ident, JVM_IDENT_MAX-1) != 0) { 694 aot_log_info(aot)("_jvm_ident expected: %s", expected_ident); 695 aot_log_info(aot)(" actual: %s", actual_ident); 696 aot_log_warning(aot)("The %s was created by a different" 697 " version or build of HotSpot", file_type); 698 return false; 699 } 700 701 _file_offset = header()->header_size(); // accounts for the size of _base_archive_name 702 703 size_t len = os::lseek(fd, 0, SEEK_END); 704 705 for (int i = 0; i < MetaspaceShared::n_regions; i++) { 706 FileMapRegion* r = region_at(i); 707 if (r->file_offset() > len || len - r->file_offset() < r->used()) { 708 aot_log_warning(aot)("The %s has been truncated.", file_type); 709 return false; 710 } 711 } 712 713 return true; 714 } 715 716 void FileMapInfo::seek_to_position(size_t pos) { 717 if (os::lseek(_fd, (long)pos, SEEK_SET) < 0) { 718 aot_log_error(aot)("Unable to seek to position %zu", pos); 719 MetaspaceShared::unrecoverable_loading_error(); 720 } 721 } 722 723 // Read the FileMapInfo information from the file. 724 bool FileMapInfo::open_for_read() { 725 if (_file_open) { 726 return true; 727 } 728 const char* file_type = CDSConfig::type_of_archive_being_loaded(); 729 const char* info = CDSConfig::is_dumping_final_static_archive() ? 730 "AOTConfiguration file " : ""; 731 aot_log_info(aot)("trying to map %s%s", info, _full_path); 732 int fd = os::open(_full_path, O_RDONLY | O_BINARY, 0); 733 if (fd < 0) { 734 if (errno == ENOENT) { 735 aot_log_info(aot)("Specified %s not found (%s)", file_type, _full_path); 736 } else { 737 aot_log_warning(aot)("Failed to open %s (%s)", file_type, 738 os::strerror(errno)); 739 } 740 return false; 741 } else { 742 aot_log_info(aot)("Opened %s %s.", file_type, _full_path); 743 } 744 745 _fd = fd; 746 _file_open = true; 747 return true; 748 } 749 750 // Write the FileMapInfo information to the file. 751 752 void FileMapInfo::open_as_output() { 753 if (CDSConfig::new_aot_flags_used()) { 754 if (CDSConfig::is_dumping_preimage_static_archive()) { 755 log_info(aot)("Writing binary AOTConfiguration file: %s", _full_path); 756 } else { 757 log_info(aot)("Writing AOTCache file: %s", _full_path); 758 } 759 } else { 760 aot_log_info(aot)("Dumping shared data to file: %s", _full_path); 761 } 762 763 #ifdef _WINDOWS // On Windows, need WRITE permission to remove the file. 764 chmod(_full_path, _S_IREAD | _S_IWRITE); 765 #endif 766 767 // Use remove() to delete the existing file because, on Unix, this will 768 // allow processes that have it open continued access to the file. 769 remove(_full_path); 770 int fd = os::open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0666); 771 if (fd < 0) { 772 aot_log_error(aot)("Unable to create %s %s: (%s).", CDSConfig::type_of_archive_being_written(), _full_path, 773 os::strerror(errno)); 774 MetaspaceShared::writing_error(); 775 return; 776 } 777 _fd = fd; 778 _file_open = true; 779 780 // Seek past the header. We will write the header after all regions are written 781 // and their CRCs computed. 782 size_t header_bytes = header()->header_size(); 783 784 header_bytes = align_up(header_bytes, MetaspaceShared::core_region_alignment()); 785 _file_offset = header_bytes; 786 seek_to_position(_file_offset); 787 } 788 789 // Write the header to the file, seek to the next allocation boundary. 790 791 void FileMapInfo::write_header() { 792 _file_offset = 0; 793 seek_to_position(_file_offset); 794 assert(is_file_position_aligned(), "must be"); 795 write_bytes(header(), header()->header_size()); 796 } 797 798 size_t FileMapRegion::used_aligned() const { 799 return align_up(used(), MetaspaceShared::core_region_alignment()); 800 } 801 802 void FileMapRegion::init(int region_index, size_t mapping_offset, size_t size, bool read_only, 803 bool allow_exec, int crc) { 804 _is_heap_region = HeapShared::is_heap_region(region_index); 805 _is_bitmap_region = (region_index == MetaspaceShared::bm); 806 _mapping_offset = mapping_offset; 807 _used = size; 808 _read_only = read_only; 809 _allow_exec = allow_exec; 810 _crc = crc; 811 _mapped_from_file = false; 812 _mapped_base = nullptr; 813 _in_reserved_space = false; 814 } 815 816 void FileMapRegion::init_oopmap(size_t offset, size_t size_in_bits) { 817 _oopmap_offset = offset; 818 _oopmap_size_in_bits = size_in_bits; 819 } 820 821 void FileMapRegion::init_ptrmap(size_t offset, size_t size_in_bits) { 822 _ptrmap_offset = offset; 823 _ptrmap_size_in_bits = size_in_bits; 824 } 825 826 bool FileMapRegion::check_region_crc(char* base) const { 827 // This function should be called after the region has been properly 828 // loaded into memory via FileMapInfo::map_region() or FileMapInfo::read_region(). 829 // I.e., this->mapped_base() must be valid. 830 size_t sz = used(); 831 if (sz == 0) { 832 return true; 833 } 834 835 assert(base != nullptr, "must be initialized"); 836 int crc = ClassLoader::crc32(0, base, (jint)sz); 837 if (crc != this->crc()) { 838 aot_log_warning(aot)("Checksum verification failed."); 839 return false; 840 } 841 return true; 842 } 843 844 static const char* region_name(int region_index) { 845 static const char* names[] = { 846 "rw", "ro", "bm", "hp", "ac" 847 }; 848 const int num_regions = sizeof(names)/sizeof(names[0]); 849 assert(0 <= region_index && region_index < num_regions, "sanity"); 850 851 return names[region_index]; 852 } 853 854 BitMapView FileMapInfo::bitmap_view(int region_index, bool is_oopmap) { 855 FileMapRegion* r = region_at(region_index); 856 char* bitmap_base = is_static() ? FileMapInfo::current_info()->map_bitmap_region() : FileMapInfo::dynamic_info()->map_bitmap_region(); 857 bitmap_base += is_oopmap ? r->oopmap_offset() : r->ptrmap_offset(); 858 size_t size_in_bits = is_oopmap ? r->oopmap_size_in_bits() : r->ptrmap_size_in_bits(); 859 860 aot_log_debug(aot, reloc)("mapped %s relocation %smap @ " INTPTR_FORMAT " (%zu bits)", 861 region_name(region_index), is_oopmap ? "oop" : "ptr", 862 p2i(bitmap_base), size_in_bits); 863 864 return BitMapView((BitMap::bm_word_t*)(bitmap_base), size_in_bits); 865 } 866 867 BitMapView FileMapInfo::oopmap_view(int region_index) { 868 return bitmap_view(region_index, /*is_oopmap*/true); 869 } 870 871 BitMapView FileMapInfo::ptrmap_view(int region_index) { 872 return bitmap_view(region_index, /*is_oopmap*/false); 873 } 874 875 void FileMapRegion::print(outputStream* st, int region_index) { 876 st->print_cr("============ region ============= %d \"%s\"", region_index, region_name(region_index)); 877 st->print_cr("- crc: 0x%08x", _crc); 878 st->print_cr("- read_only: %d", _read_only); 879 st->print_cr("- allow_exec: %d", _allow_exec); 880 st->print_cr("- is_heap_region: %d", _is_heap_region); 881 st->print_cr("- is_bitmap_region: %d", _is_bitmap_region); 882 st->print_cr("- mapped_from_file: %d", _mapped_from_file); 883 st->print_cr("- file_offset: 0x%zx", _file_offset); 884 st->print_cr("- mapping_offset: 0x%zx", _mapping_offset); 885 st->print_cr("- used: %zu", _used); 886 st->print_cr("- oopmap_offset: 0x%zx", _oopmap_offset); 887 st->print_cr("- oopmap_size_in_bits: %zu", _oopmap_size_in_bits); 888 st->print_cr("- ptrmap_offset: 0x%zx", _ptrmap_offset); 889 st->print_cr("- ptrmap_size_in_bits: %zu", _ptrmap_size_in_bits); 890 st->print_cr("- mapped_base: " INTPTR_FORMAT, p2i(_mapped_base)); 891 } 892 893 void FileMapInfo::write_region(int region, char* base, size_t size, 894 bool read_only, bool allow_exec) { 895 assert(CDSConfig::is_dumping_archive(), "sanity"); 896 897 FileMapRegion* r = region_at(region); 898 char* requested_base; 899 size_t mapping_offset = 0; 900 901 if (region == MetaspaceShared::bm) { 902 requested_base = nullptr; // always null for bm region 903 } else if (size == 0) { 904 // This is an unused region (e.g., a heap region when !INCLUDE_CDS_JAVA_HEAP) 905 requested_base = nullptr; 906 } else if (HeapShared::is_heap_region(region)) { 907 assert(CDSConfig::is_dumping_heap(), "sanity"); 908 #if INCLUDE_CDS_JAVA_HEAP 909 assert(!CDSConfig::is_dumping_dynamic_archive(), "must be"); 910 requested_base = (char*)ArchiveHeapWriter::requested_address(); 911 if (UseCompressedOops) { 912 mapping_offset = (size_t)((address)requested_base - CompressedOops::base()); 913 assert((mapping_offset >> CompressedOops::shift()) << CompressedOops::shift() == mapping_offset, "must be"); 914 } else { 915 mapping_offset = 0; // not used with !UseCompressedOops 916 } 917 #endif // INCLUDE_CDS_JAVA_HEAP 918 } else { 919 char* requested_SharedBaseAddress = (char*)MetaspaceShared::requested_base_address(); 920 requested_base = ArchiveBuilder::current()->to_requested(base); 921 assert(requested_base >= requested_SharedBaseAddress, "must be"); 922 mapping_offset = requested_base - requested_SharedBaseAddress; 923 } 924 925 r->set_file_offset(_file_offset); 926 int crc = ClassLoader::crc32(0, base, (jint)size); 927 if (size > 0) { 928 aot_log_info(aot)("Shared file region (%s) %d: %8zu" 929 " bytes, addr " INTPTR_FORMAT " file offset 0x%08" PRIxPTR 930 " crc 0x%08x", 931 region_name(region), region, size, p2i(requested_base), _file_offset, crc); 932 } else { 933 aot_log_info(aot)("Shared file region (%s) %d: %8zu" 934 " bytes", region_name(region), region, size); 935 } 936 937 r->init(region, mapping_offset, size, read_only, allow_exec, crc); 938 939 if (base != nullptr) { 940 write_bytes_aligned(base, size); 941 } 942 } 943 944 static size_t write_bitmap(const CHeapBitMap* map, char* output, size_t offset) { 945 size_t size_in_bytes = map->size_in_bytes(); 946 map->write_to((BitMap::bm_word_t*)(output + offset), size_in_bytes); 947 return offset + size_in_bytes; 948 } 949 950 // The sorting code groups the objects with non-null oop/ptrs together. 951 // Relevant bitmaps then have lots of leading and trailing zeros, which 952 // we do not have to store. 953 size_t FileMapInfo::remove_bitmap_zeros(CHeapBitMap* map) { 954 BitMap::idx_t first_set = map->find_first_set_bit(0); 955 BitMap::idx_t last_set = map->find_last_set_bit(0); 956 size_t old_size = map->size(); 957 958 // Slice and resize bitmap 959 map->truncate(first_set, last_set + 1); 960 961 assert(map->at(0), "First bit should be set"); 962 assert(map->at(map->size() - 1), "Last bit should be set"); 963 assert(map->size() <= old_size, "sanity"); 964 965 return first_set; 966 } 967 968 char* FileMapInfo::write_bitmap_region(CHeapBitMap* rw_ptrmap, CHeapBitMap* ro_ptrmap, 969 CHeapBitMap* ac_ptrmap, 970 ArchiveHeapInfo* heap_info, 971 size_t &size_in_bytes) { 972 size_t removed_rw_leading_zeros = remove_bitmap_zeros(rw_ptrmap); 973 size_t removed_ro_leading_zeros = remove_bitmap_zeros(ro_ptrmap); 974 header()->set_rw_ptrmap_start_pos(removed_rw_leading_zeros); 975 header()->set_ro_ptrmap_start_pos(removed_ro_leading_zeros); 976 size_in_bytes = rw_ptrmap->size_in_bytes() + ro_ptrmap->size_in_bytes() + ac_ptrmap->size_in_bytes(); 977 978 if (heap_info->is_used()) { 979 // Remove leading and trailing zeros 980 size_t removed_oop_leading_zeros = remove_bitmap_zeros(heap_info->oopmap()); 981 size_t removed_ptr_leading_zeros = remove_bitmap_zeros(heap_info->ptrmap()); 982 header()->set_heap_oopmap_start_pos(removed_oop_leading_zeros); 983 header()->set_heap_ptrmap_start_pos(removed_ptr_leading_zeros); 984 985 size_in_bytes += heap_info->oopmap()->size_in_bytes(); 986 size_in_bytes += heap_info->ptrmap()->size_in_bytes(); 987 } 988 989 // The bitmap region contains up to 4 parts: 990 // rw_ptrmap: metaspace pointers inside the read-write region 991 // ro_ptrmap: metaspace pointers inside the read-only region 992 // heap_info->oopmap(): Java oop pointers in the heap region 993 // heap_info->ptrmap(): metaspace pointers in the heap region 994 char* buffer = NEW_C_HEAP_ARRAY(char, size_in_bytes, mtClassShared); 995 size_t written = 0; 996 997 region_at(MetaspaceShared::rw)->init_ptrmap(0, rw_ptrmap->size()); 998 written = write_bitmap(rw_ptrmap, buffer, written); 999 1000 region_at(MetaspaceShared::ro)->init_ptrmap(written, ro_ptrmap->size()); 1001 written = write_bitmap(ro_ptrmap, buffer, written); 1002 1003 region_at(MetaspaceShared::ac)->init_ptrmap(written, ac_ptrmap->size()); 1004 written = write_bitmap(ac_ptrmap, buffer, written); 1005 1006 if (heap_info->is_used()) { 1007 FileMapRegion* r = region_at(MetaspaceShared::hp); 1008 1009 r->init_oopmap(written, heap_info->oopmap()->size()); 1010 written = write_bitmap(heap_info->oopmap(), buffer, written); 1011 1012 r->init_ptrmap(written, heap_info->ptrmap()->size()); 1013 written = write_bitmap(heap_info->ptrmap(), buffer, written); 1014 } 1015 1016 write_region(MetaspaceShared::bm, (char*)buffer, size_in_bytes, /*read_only=*/true, /*allow_exec=*/false); 1017 return buffer; 1018 } 1019 1020 size_t FileMapInfo::write_heap_region(ArchiveHeapInfo* heap_info) { 1021 char* buffer_start = heap_info->buffer_start(); 1022 size_t buffer_size = heap_info->buffer_byte_size(); 1023 write_region(MetaspaceShared::hp, buffer_start, buffer_size, false, false); 1024 header()->set_heap_root_segments(heap_info->heap_root_segments()); 1025 return buffer_size; 1026 } 1027 1028 // Dump bytes to file -- at the current file position. 1029 1030 void FileMapInfo::write_bytes(const void* buffer, size_t nbytes) { 1031 assert(_file_open, "must be"); 1032 if (!os::write(_fd, buffer, nbytes)) { 1033 // If the shared archive is corrupted, close it and remove it. 1034 close(); 1035 remove(_full_path); 1036 1037 if (CDSConfig::is_dumping_preimage_static_archive()) { 1038 MetaspaceShared::writing_error("Unable to write to AOT configuration file."); 1039 } else if (CDSConfig::new_aot_flags_used()) { 1040 MetaspaceShared::writing_error("Unable to write to AOT cache."); 1041 } else { 1042 MetaspaceShared::writing_error("Unable to write to shared archive."); 1043 } 1044 } 1045 _file_offset += nbytes; 1046 } 1047 1048 bool FileMapInfo::is_file_position_aligned() const { 1049 return _file_offset == align_up(_file_offset, 1050 MetaspaceShared::core_region_alignment()); 1051 } 1052 1053 // Align file position to an allocation unit boundary. 1054 1055 void FileMapInfo::align_file_position() { 1056 assert(_file_open, "must be"); 1057 size_t new_file_offset = align_up(_file_offset, 1058 MetaspaceShared::core_region_alignment()); 1059 if (new_file_offset != _file_offset) { 1060 _file_offset = new_file_offset; 1061 // Seek one byte back from the target and write a byte to insure 1062 // that the written file is the correct length. 1063 _file_offset -= 1; 1064 seek_to_position(_file_offset); 1065 char zero = 0; 1066 write_bytes(&zero, 1); 1067 } 1068 } 1069 1070 1071 // Dump bytes to file -- at the current file position. 1072 1073 void FileMapInfo::write_bytes_aligned(const void* buffer, size_t nbytes) { 1074 align_file_position(); 1075 write_bytes(buffer, nbytes); 1076 align_file_position(); 1077 } 1078 1079 // Close the shared archive file. This does NOT unmap mapped regions. 1080 1081 void FileMapInfo::close() { 1082 if (_file_open) { 1083 if (::close(_fd) < 0) { 1084 MetaspaceShared::unrecoverable_loading_error("Unable to close the shared archive file."); 1085 } 1086 _file_open = false; 1087 _fd = -1; 1088 } 1089 } 1090 1091 /* 1092 * Same as os::map_memory() but also pretouches if AlwaysPreTouch is enabled. 1093 */ 1094 static char* map_memory(int fd, const char* file_name, size_t file_offset, 1095 char *addr, size_t bytes, bool read_only, 1096 bool allow_exec, MemTag mem_tag) { 1097 char* mem = os::map_memory(fd, file_name, file_offset, addr, bytes, 1098 mem_tag, AlwaysPreTouch ? false : read_only, 1099 allow_exec); 1100 if (mem != nullptr && AlwaysPreTouch) { 1101 os::pretouch_memory(mem, mem + bytes); 1102 } 1103 return mem; 1104 } 1105 1106 // JVM/TI RedefineClasses() support: 1107 // Remap the shared readonly space to shared readwrite, private. 1108 bool FileMapInfo::remap_shared_readonly_as_readwrite() { 1109 int idx = MetaspaceShared::ro; 1110 FileMapRegion* r = region_at(idx); 1111 if (!r->read_only()) { 1112 // the space is already readwrite so we are done 1113 return true; 1114 } 1115 size_t size = r->used_aligned(); 1116 if (!open_for_read()) { 1117 return false; 1118 } 1119 char *addr = r->mapped_base(); 1120 // This path should not be reached for Windows; see JDK-8222379. 1121 assert(WINDOWS_ONLY(false) NOT_WINDOWS(true), "Don't call on Windows"); 1122 // Replace old mapping with new one that is writable. 1123 char *base = os::map_memory(_fd, _full_path, r->file_offset(), 1124 addr, size, mtNone, false /* !read_only */, 1125 r->allow_exec()); 1126 close(); 1127 // These have to be errors because the shared region is now unmapped. 1128 if (base == nullptr) { 1129 aot_log_error(aot)("Unable to remap shared readonly space (errno=%d).", errno); 1130 vm_exit(1); 1131 } 1132 if (base != addr) { 1133 aot_log_error(aot)("Unable to remap shared readonly space (errno=%d).", errno); 1134 vm_exit(1); 1135 } 1136 r->set_read_only(false); 1137 return true; 1138 } 1139 1140 // Memory map a region in the address space. 1141 static const char* shared_region_name[] = { "ReadWrite", "ReadOnly", "Bitmap", "Heap", "Code" }; 1142 1143 MapArchiveResult FileMapInfo::map_regions(int regions[], int num_regions, char* mapped_base_address, ReservedSpace rs) { 1144 DEBUG_ONLY(FileMapRegion* last_region = nullptr); 1145 intx addr_delta = mapped_base_address - header()->requested_base_address(); 1146 1147 // Make sure we don't attempt to use header()->mapped_base_address() unless 1148 // it's been successfully mapped. 1149 DEBUG_ONLY(header()->set_mapped_base_address((char*)(uintptr_t)0xdeadbeef);) 1150 1151 for (int i = 0; i < num_regions; i++) { 1152 int idx = regions[i]; 1153 MapArchiveResult result = map_region(idx, addr_delta, mapped_base_address, rs); 1154 if (result != MAP_ARCHIVE_SUCCESS) { 1155 return result; 1156 } 1157 FileMapRegion* r = region_at(idx); 1158 DEBUG_ONLY(if (last_region != nullptr) { 1159 // Ensure that the OS won't be able to allocate new memory spaces between any mapped 1160 // regions, or else it would mess up the simple comparison in MetaspaceObj::is_shared(). 1161 assert(r->mapped_base() == last_region->mapped_end(), "must have no gaps"); 1162 } 1163 last_region = r;) 1164 aot_log_info(aot)("Mapped %s region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)", is_static() ? "static " : "dynamic", 1165 idx, p2i(r->mapped_base()), p2i(r->mapped_end()), 1166 shared_region_name[idx]); 1167 1168 } 1169 1170 header()->set_mapped_base_address(header()->requested_base_address() + addr_delta); 1171 if (addr_delta != 0 && !relocate_pointers_in_core_regions(addr_delta)) { 1172 return MAP_ARCHIVE_OTHER_FAILURE; 1173 } 1174 1175 return MAP_ARCHIVE_SUCCESS; 1176 } 1177 1178 bool FileMapInfo::read_region(int i, char* base, size_t size, bool do_commit) { 1179 FileMapRegion* r = region_at(i); 1180 if (do_commit) { 1181 aot_log_info(aot)("Commit %s region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)%s", 1182 is_static() ? "static " : "dynamic", i, p2i(base), p2i(base + size), 1183 shared_region_name[i], r->allow_exec() ? " exec" : ""); 1184 if (!os::commit_memory(base, size, r->allow_exec())) { 1185 aot_log_error(aot)("Failed to commit %s region #%d (%s)", is_static() ? "static " : "dynamic", 1186 i, shared_region_name[i]); 1187 return false; 1188 } 1189 } 1190 if (os::lseek(_fd, (long)r->file_offset(), SEEK_SET) != (int)r->file_offset() || 1191 read_bytes(base, size) != size) { 1192 return false; 1193 } 1194 1195 if (VerifySharedSpaces && !r->check_region_crc(base)) { 1196 return false; 1197 } 1198 1199 r->set_mapped_from_file(false); 1200 r->set_mapped_base(base); 1201 1202 return true; 1203 } 1204 1205 MapArchiveResult FileMapInfo::map_region(int i, intx addr_delta, char* mapped_base_address, ReservedSpace rs) { 1206 assert(!HeapShared::is_heap_region(i), "sanity"); 1207 FileMapRegion* r = region_at(i); 1208 size_t size = r->used_aligned(); 1209 char *requested_addr = mapped_base_address + r->mapping_offset(); 1210 assert(!is_mapped(), "must be not mapped yet"); 1211 assert(requested_addr != nullptr, "must be specified"); 1212 1213 r->set_mapped_from_file(false); 1214 r->set_in_reserved_space(false); 1215 1216 if (MetaspaceShared::use_windows_memory_mapping()) { 1217 // Windows cannot remap read-only shared memory to read-write when required for 1218 // RedefineClasses, which is also used by JFR. Always map windows regions as RW. 1219 r->set_read_only(false); 1220 } else if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space() || 1221 Arguments::has_jfr_option()) { 1222 // If a tool agent is in use (debugging enabled), or JFR, we must map the address space RW 1223 r->set_read_only(false); 1224 } else if (addr_delta != 0) { 1225 r->set_read_only(false); // Need to patch the pointers 1226 } 1227 1228 if (MetaspaceShared::use_windows_memory_mapping() && rs.is_reserved()) { 1229 // This is the second time we try to map the archive(s). We have already created a ReservedSpace 1230 // that covers all the FileMapRegions to ensure all regions can be mapped. However, Windows 1231 // can't mmap into a ReservedSpace, so we just ::read() the data. We're going to patch all the 1232 // regions anyway, so there's no benefit for mmap anyway. 1233 if (!read_region(i, requested_addr, size, /* do_commit = */ true)) { 1234 aot_log_info(aot)("Failed to read %s shared space into reserved space at " INTPTR_FORMAT, 1235 shared_region_name[i], p2i(requested_addr)); 1236 return MAP_ARCHIVE_OTHER_FAILURE; // oom or I/O error. 1237 } else { 1238 assert(r->mapped_base() != nullptr, "must be initialized"); 1239 } 1240 } else { 1241 // Note that this may either be a "fresh" mapping into unreserved address 1242 // space (Windows, first mapping attempt), or a mapping into pre-reserved 1243 // space (Posix). See also comment in MetaspaceShared::map_archives(). 1244 bool read_only = r->read_only() && !CDSConfig::is_dumping_final_static_archive(); 1245 char* base = map_memory(_fd, _full_path, r->file_offset(), 1246 requested_addr, size, read_only, 1247 r->allow_exec(), mtClassShared); 1248 if (base != requested_addr) { 1249 aot_log_info(aot)("Unable to map %s shared space at " INTPTR_FORMAT, 1250 shared_region_name[i], p2i(requested_addr)); 1251 _memory_mapping_failed = true; 1252 return MAP_ARCHIVE_MMAP_FAILURE; 1253 } 1254 1255 if (VerifySharedSpaces && !r->check_region_crc(requested_addr)) { 1256 return MAP_ARCHIVE_OTHER_FAILURE; 1257 } 1258 1259 r->set_mapped_from_file(true); 1260 r->set_mapped_base(requested_addr); 1261 } 1262 1263 if (rs.is_reserved()) { 1264 char* mapped_base = r->mapped_base(); 1265 assert(rs.base() <= mapped_base && mapped_base + size <= rs.end(), 1266 PTR_FORMAT " <= " PTR_FORMAT " < " PTR_FORMAT " <= " PTR_FORMAT, 1267 p2i(rs.base()), p2i(mapped_base), p2i(mapped_base + size), p2i(rs.end())); 1268 r->set_in_reserved_space(rs.is_reserved()); 1269 } 1270 return MAP_ARCHIVE_SUCCESS; 1271 } 1272 1273 // The return value is the location of the archive relocation bitmap. 1274 char* FileMapInfo::map_bitmap_region() { 1275 FileMapRegion* r = region_at(MetaspaceShared::bm); 1276 if (r->mapped_base() != nullptr) { 1277 return r->mapped_base(); 1278 } 1279 bool read_only = true, allow_exec = false; 1280 char* requested_addr = nullptr; // allow OS to pick any location 1281 char* bitmap_base = map_memory(_fd, _full_path, r->file_offset(), 1282 requested_addr, r->used_aligned(), read_only, allow_exec, mtClassShared); 1283 if (bitmap_base == nullptr) { 1284 MetaspaceShared::report_loading_error("failed to map relocation bitmap"); 1285 return nullptr; 1286 } 1287 1288 if (VerifySharedSpaces && !r->check_region_crc(bitmap_base)) { 1289 aot_log_error(aot)("relocation bitmap CRC error"); 1290 if (!os::unmap_memory(bitmap_base, r->used_aligned())) { 1291 fatal("os::unmap_memory of relocation bitmap failed"); 1292 } 1293 return nullptr; 1294 } 1295 1296 r->set_mapped_from_file(true); 1297 r->set_mapped_base(bitmap_base); 1298 aot_log_info(aot)("Mapped %s region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)", 1299 is_static() ? "static " : "dynamic", 1300 MetaspaceShared::bm, p2i(r->mapped_base()), p2i(r->mapped_end()), 1301 shared_region_name[MetaspaceShared::bm]); 1302 return bitmap_base; 1303 } 1304 1305 bool FileMapInfo::map_aot_code_region(ReservedSpace rs) { 1306 FileMapRegion* r = region_at(MetaspaceShared::ac); 1307 assert(r->used() > 0 && r->used_aligned() == rs.size(), "must be"); 1308 1309 char* requested_base = rs.base(); 1310 assert(requested_base != nullptr, "should be inside code cache"); 1311 1312 char* mapped_base; 1313 if (MetaspaceShared::use_windows_memory_mapping()) { 1314 if (!read_region(MetaspaceShared::ac, requested_base, r->used_aligned(), /* do_commit = */ true)) { 1315 aot_log_info(aot)("Failed to read aot code shared space into reserved space at " INTPTR_FORMAT, 1316 p2i(requested_base)); 1317 return false; 1318 } 1319 mapped_base = requested_base; 1320 } else { 1321 // We do not execute in-place in the AOT code region. 1322 // AOT code is copied to the CodeCache for execution. 1323 bool read_only = false, allow_exec = false; 1324 mapped_base = map_memory(_fd, _full_path, r->file_offset(), 1325 requested_base, r->used_aligned(), read_only, allow_exec, mtClassShared); 1326 } 1327 if (mapped_base == nullptr) { 1328 aot_log_info(aot)("failed to map aot code region"); 1329 return false; 1330 } else { 1331 assert(mapped_base == requested_base, "must be"); 1332 r->set_mapped_from_file(true); 1333 r->set_mapped_base(mapped_base); 1334 relocate_pointers_in_aot_code_region(); 1335 aot_log_info(aot)("Mapped static region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)", 1336 MetaspaceShared::ac, p2i(r->mapped_base()), p2i(r->mapped_end()), 1337 shared_region_name[MetaspaceShared::ac]); 1338 return true; 1339 } 1340 } 1341 1342 class CachedCodeRelocator: public BitMapClosure { 1343 address _code_requested_base; 1344 address* _patch_base; 1345 intx _code_delta; 1346 intx _metadata_delta; 1347 1348 public: 1349 CachedCodeRelocator(address code_requested_base, address code_mapped_base, 1350 intx metadata_delta) { 1351 _code_requested_base = code_requested_base; 1352 _patch_base = (address*)code_mapped_base; 1353 _code_delta = code_mapped_base - code_requested_base; 1354 _metadata_delta = metadata_delta; 1355 } 1356 1357 bool do_bit(size_t offset) { 1358 address* p = _patch_base + offset; 1359 address requested_ptr = *p; 1360 if (requested_ptr < _code_requested_base) { 1361 *p = requested_ptr + _metadata_delta; 1362 } else { 1363 *p = requested_ptr + _code_delta; 1364 } 1365 return true; // keep iterating 1366 } 1367 }; 1368 1369 void FileMapInfo::relocate_pointers_in_aot_code_region() { 1370 FileMapRegion* r = region_at(MetaspaceShared::ac); 1371 char* bitmap_base = map_bitmap_region(); 1372 1373 BitMapView ac_ptrmap = ptrmap_view(MetaspaceShared::ac); 1374 if (ac_ptrmap.size() == 0) { 1375 return; 1376 } 1377 1378 address core_regions_requested_base = (address)header()->requested_base_address(); 1379 address core_regions_mapped_base = (address)header()->mapped_base_address(); 1380 address ac_region_requested_base = core_regions_requested_base + r->mapping_offset(); 1381 address ac_region_mapped_base = (address)r->mapped_base(); 1382 1383 size_t max_bits_for_core_regions = pointer_delta(mapped_end(), mapped_base(), // FIXME - renamed to core_regions_mapped_base(), etc 1384 sizeof(address)); 1385 1386 CachedCodeRelocator patcher(ac_region_requested_base, ac_region_mapped_base, 1387 core_regions_mapped_base - core_regions_requested_base); 1388 ac_ptrmap.iterate(&patcher); 1389 } 1390 1391 class SharedDataRelocationTask : public ArchiveWorkerTask { 1392 private: 1393 BitMapView* const _rw_bm; 1394 BitMapView* const _ro_bm; 1395 SharedDataRelocator* const _rw_reloc; 1396 SharedDataRelocator* const _ro_reloc; 1397 1398 public: 1399 SharedDataRelocationTask(BitMapView* rw_bm, BitMapView* ro_bm, SharedDataRelocator* rw_reloc, SharedDataRelocator* ro_reloc) : 1400 ArchiveWorkerTask("Shared Data Relocation"), 1401 _rw_bm(rw_bm), _ro_bm(ro_bm), _rw_reloc(rw_reloc), _ro_reloc(ro_reloc) {} 1402 1403 void work(int chunk, int max_chunks) override { 1404 work_on(chunk, max_chunks, _rw_bm, _rw_reloc); 1405 work_on(chunk, max_chunks, _ro_bm, _ro_reloc); 1406 } 1407 1408 void work_on(int chunk, int max_chunks, BitMapView* bm, SharedDataRelocator* reloc) { 1409 BitMap::idx_t size = bm->size(); 1410 BitMap::idx_t start = MIN2(size, size * chunk / max_chunks); 1411 BitMap::idx_t end = MIN2(size, size * (chunk + 1) / max_chunks); 1412 assert(end > start, "Sanity: no empty slices"); 1413 bm->iterate(reloc, start, end); 1414 } 1415 }; 1416 1417 // This is called when we cannot map the archive at the requested[ base address (usually 0x800000000). 1418 // We relocate all pointers in the 2 core regions (ro, rw). 1419 bool FileMapInfo::relocate_pointers_in_core_regions(intx addr_delta) { 1420 aot_log_debug(aot, reloc)("runtime archive relocation start"); 1421 char* bitmap_base = map_bitmap_region(); 1422 1423 if (bitmap_base == nullptr) { 1424 return false; // OOM, or CRC check failure 1425 } else { 1426 BitMapView rw_ptrmap = ptrmap_view(MetaspaceShared::rw); 1427 BitMapView ro_ptrmap = ptrmap_view(MetaspaceShared::ro); 1428 1429 FileMapRegion* rw_region = first_core_region(); 1430 FileMapRegion* ro_region = last_core_region(); 1431 1432 // Patch all pointers inside the RW region 1433 address rw_patch_base = (address)rw_region->mapped_base(); 1434 address rw_patch_end = (address)rw_region->mapped_end(); 1435 1436 // Patch all pointers inside the RO region 1437 address ro_patch_base = (address)ro_region->mapped_base(); 1438 address ro_patch_end = (address)ro_region->mapped_end(); 1439 1440 // the current value of the pointers to be patched must be within this 1441 // range (i.e., must be between the requested base address and the address of the current archive). 1442 // Note: top archive may point to objects in the base archive, but not the other way around. 1443 address valid_old_base = (address)header()->requested_base_address(); 1444 address valid_old_end = valid_old_base + mapping_end_offset(); 1445 1446 // after patching, the pointers must point inside this range 1447 // (the requested location of the archive, as mapped at runtime). 1448 address valid_new_base = (address)header()->mapped_base_address(); 1449 address valid_new_end = (address)mapped_end(); 1450 1451 SharedDataRelocator rw_patcher((address*)rw_patch_base + header()->rw_ptrmap_start_pos(), (address*)rw_patch_end, valid_old_base, valid_old_end, 1452 valid_new_base, valid_new_end, addr_delta); 1453 SharedDataRelocator ro_patcher((address*)ro_patch_base + header()->ro_ptrmap_start_pos(), (address*)ro_patch_end, valid_old_base, valid_old_end, 1454 valid_new_base, valid_new_end, addr_delta); 1455 1456 if (AOTCacheParallelRelocation) { 1457 ArchiveWorkers workers; 1458 SharedDataRelocationTask task(&rw_ptrmap, &ro_ptrmap, &rw_patcher, &ro_patcher); 1459 workers.run_task(&task); 1460 } else { 1461 rw_ptrmap.iterate(&rw_patcher); 1462 ro_ptrmap.iterate(&ro_patcher); 1463 } 1464 1465 // The MetaspaceShared::bm region will be unmapped in MetaspaceShared::initialize_shared_spaces(). 1466 1467 aot_log_debug(aot, reloc)("runtime archive relocation done"); 1468 return true; 1469 } 1470 } 1471 1472 size_t FileMapInfo::read_bytes(void* buffer, size_t count) { 1473 assert(_file_open, "Archive file is not open"); 1474 size_t n = ::read(_fd, buffer, (unsigned int)count); 1475 if (n != count) { 1476 // Close the file if there's a problem reading it. 1477 close(); 1478 return 0; 1479 } 1480 _file_offset += count; 1481 return count; 1482 } 1483 1484 // Get the total size in bytes of a read only region 1485 size_t FileMapInfo::readonly_total() { 1486 size_t total = 0; 1487 if (current_info() != nullptr) { 1488 FileMapRegion* r = FileMapInfo::current_info()->region_at(MetaspaceShared::ro); 1489 if (r->read_only()) total += r->used(); 1490 } 1491 if (dynamic_info() != nullptr) { 1492 FileMapRegion* r = FileMapInfo::dynamic_info()->region_at(MetaspaceShared::ro); 1493 if (r->read_only()) total += r->used(); 1494 } 1495 return total; 1496 } 1497 1498 #if INCLUDE_CDS_JAVA_HEAP 1499 MemRegion FileMapInfo::_mapped_heap_memregion; 1500 1501 bool FileMapInfo::has_heap_region() { 1502 return (region_at(MetaspaceShared::hp)->used() > 0); 1503 } 1504 1505 // Returns the address range of the archived heap region computed using the 1506 // current oop encoding mode. This range may be different than the one seen at 1507 // dump time due to encoding mode differences. The result is used in determining 1508 // if/how these regions should be relocated at run time. 1509 MemRegion FileMapInfo::get_heap_region_requested_range() { 1510 FileMapRegion* r = region_at(MetaspaceShared::hp); 1511 size_t size = r->used(); 1512 assert(size > 0, "must have non-empty heap region"); 1513 1514 address start = heap_region_requested_address(); 1515 address end = start + size; 1516 aot_log_info(aot)("Requested heap region [" INTPTR_FORMAT " - " INTPTR_FORMAT "] = %8zu bytes", 1517 p2i(start), p2i(end), size); 1518 1519 return MemRegion((HeapWord*)start, (HeapWord*)end); 1520 } 1521 1522 void FileMapInfo::map_or_load_heap_region() { 1523 bool success = false; 1524 1525 if (can_use_heap_region()) { 1526 if (ArchiveHeapLoader::can_map()) { 1527 success = map_heap_region(); 1528 } else if (ArchiveHeapLoader::can_load()) { 1529 success = ArchiveHeapLoader::load_heap_region(this); 1530 } else { 1531 if (!UseCompressedOops && !ArchiveHeapLoader::can_map()) { 1532 MetaspaceShared::report_loading_error("Cannot use CDS heap data. Selected GC not compatible -XX:-UseCompressedOops"); 1533 } else { 1534 MetaspaceShared::report_loading_error("Cannot use CDS heap data. UseEpsilonGC, UseG1GC, UseSerialGC, UseParallelGC, or UseShenandoahGC are required."); 1535 } 1536 } 1537 } 1538 1539 if (!success) { 1540 if (CDSConfig::is_using_aot_linked_classes() && !CDSConfig::is_dumping_final_static_archive()) { 1541 // It's too late to recover -- we have already committed to use the archived metaspace objects, but 1542 // the archived heap objects cannot be loaded, so we don't have the archived FMG to guarantee that 1543 // all AOT-linked classes are visible. 1544 // 1545 // We get here because the heap is too small. The app will fail anyway. So let's quit. 1546 aot_log_error(aot)("%s has aot-linked classes but the archived " 1547 "heap objects cannot be loaded. Try increasing your heap size.", 1548 CDSConfig::type_of_archive_being_loaded()); 1549 MetaspaceShared::unrecoverable_loading_error(); 1550 } 1551 CDSConfig::stop_using_full_module_graph("archive heap loading failed"); 1552 } 1553 } 1554 1555 bool FileMapInfo::can_use_heap_region() { 1556 if (!has_heap_region()) { 1557 return false; 1558 } 1559 if (JvmtiExport::should_post_class_file_load_hook() && JvmtiExport::has_early_class_hook_env()) { 1560 ShouldNotReachHere(); // CDS should have been disabled. 1561 // The archived objects are mapped at JVM start-up, but we don't know if 1562 // j.l.String or j.l.Class might be replaced by the ClassFileLoadHook, 1563 // which would make the archived String or mirror objects invalid. Let's be safe and not 1564 // use the archived objects. These 2 classes are loaded during the JVMTI "early" stage. 1565 // 1566 // If JvmtiExport::has_early_class_hook_env() is false, the classes of some objects 1567 // in the archived subgraphs may be replaced by the ClassFileLoadHook. But that's OK 1568 // because we won't install an archived object subgraph if the klass of any of the 1569 // referenced objects are replaced. See HeapShared::initialize_from_archived_subgraph(). 1570 } 1571 1572 // We pre-compute narrow Klass IDs with the runtime mapping start intended to be the base, and a shift of 1573 // ArchiveBuilder::precomputed_narrow_klass_shift. We enforce this encoding at runtime (see 1574 // CompressedKlassPointers::initialize_for_given_encoding()). Therefore, the following assertions must 1575 // hold: 1576 address archive_narrow_klass_base = (address)header()->mapped_base_address(); 1577 const int archive_narrow_klass_pointer_bits = header()->narrow_klass_pointer_bits(); 1578 const int archive_narrow_klass_shift = header()->narrow_klass_shift(); 1579 1580 aot_log_info(aot)("CDS archive was created with max heap size = %zuM, and the following configuration:", 1581 max_heap_size()/M); 1582 aot_log_info(aot)(" narrow_klass_base at mapping start address, narrow_klass_pointer_bits = %d, narrow_klass_shift = %d", 1583 archive_narrow_klass_pointer_bits, archive_narrow_klass_shift); 1584 aot_log_info(aot)(" narrow_oop_mode = %d, narrow_oop_base = " PTR_FORMAT ", narrow_oop_shift = %d", 1585 narrow_oop_mode(), p2i(narrow_oop_base()), narrow_oop_shift()); 1586 aot_log_info(aot)("The current max heap size = %zuM, G1HeapRegion::GrainBytes = %zu", 1587 MaxHeapSize/M, G1HeapRegion::GrainBytes); 1588 aot_log_info(aot)(" narrow_klass_base = " PTR_FORMAT ", arrow_klass_pointer_bits = %d, narrow_klass_shift = %d", 1589 p2i(CompressedKlassPointers::base()), CompressedKlassPointers::narrow_klass_pointer_bits(), CompressedKlassPointers::shift()); 1590 aot_log_info(aot)(" narrow_oop_mode = %d, narrow_oop_base = " PTR_FORMAT ", narrow_oop_shift = %d", 1591 CompressedOops::mode(), p2i(CompressedOops::base()), CompressedOops::shift()); 1592 aot_log_info(aot)(" heap range = [" PTR_FORMAT " - " PTR_FORMAT "]", 1593 UseCompressedOops ? p2i(CompressedOops::begin()) : 1594 UseG1GC ? p2i((address)G1CollectedHeap::heap()->reserved().start()) : 0L, 1595 UseCompressedOops ? p2i(CompressedOops::end()) : 1596 UseG1GC ? p2i((address)G1CollectedHeap::heap()->reserved().end()) : 0L); 1597 1598 int err = 0; 1599 if ( archive_narrow_klass_base != CompressedKlassPointers::base() || 1600 (err = 1, archive_narrow_klass_pointer_bits != CompressedKlassPointers::narrow_klass_pointer_bits()) || 1601 (err = 2, archive_narrow_klass_shift != CompressedKlassPointers::shift()) ) { 1602 stringStream ss; 1603 switch (err) { 1604 case 0: 1605 ss.print("Unexpected encoding base encountered (" PTR_FORMAT ", expected " PTR_FORMAT ")", 1606 p2i(CompressedKlassPointers::base()), p2i(archive_narrow_klass_base)); 1607 break; 1608 case 1: 1609 ss.print("Unexpected narrow Klass bit length encountered (%d, expected %d)", 1610 CompressedKlassPointers::narrow_klass_pointer_bits(), archive_narrow_klass_pointer_bits); 1611 break; 1612 case 2: 1613 ss.print("Unexpected narrow Klass shift encountered (%d, expected %d)", 1614 CompressedKlassPointers::shift(), archive_narrow_klass_shift); 1615 break; 1616 default: 1617 ShouldNotReachHere(); 1618 }; 1619 if (CDSConfig::new_aot_flags_used()) { 1620 LogTarget(Info, aot) lt; 1621 if (lt.is_enabled()) { 1622 LogStream ls(lt); 1623 ls.print_raw(ss.base()); 1624 header()->print(&ls); 1625 } 1626 } else { 1627 LogTarget(Info, cds) lt; 1628 if (lt.is_enabled()) { 1629 LogStream ls(lt); 1630 ls.print_raw(ss.base()); 1631 header()->print(&ls); 1632 } 1633 } 1634 assert(false, "%s", ss.base()); 1635 } 1636 1637 return true; 1638 } 1639 1640 // The actual address of this region during dump time. 1641 address FileMapInfo::heap_region_dumptime_address() { 1642 FileMapRegion* r = region_at(MetaspaceShared::hp); 1643 assert(CDSConfig::is_using_archive(), "runtime only"); 1644 assert(is_aligned(r->mapping_offset(), sizeof(HeapWord)), "must be"); 1645 if (UseCompressedOops) { 1646 return /*dumptime*/ (address)((uintptr_t)narrow_oop_base() + r->mapping_offset()); 1647 } else { 1648 return heap_region_requested_address(); 1649 } 1650 } 1651 1652 // The address where this region can be mapped into the runtime heap without 1653 // patching any of the pointers that are embedded in this region. 1654 address FileMapInfo::heap_region_requested_address() { 1655 assert(CDSConfig::is_using_archive(), "runtime only"); 1656 FileMapRegion* r = region_at(MetaspaceShared::hp); 1657 assert(is_aligned(r->mapping_offset(), sizeof(HeapWord)), "must be"); 1658 assert(ArchiveHeapLoader::can_use(), "GC must support mapping or loading"); 1659 if (UseCompressedOops) { 1660 // We can avoid relocation if each region's offset from the runtime CompressedOops::base() 1661 // is the same as its offset from the CompressedOops::base() during dumptime. 1662 // Note that CompressedOops::base() may be different between dumptime and runtime. 1663 // 1664 // Example: 1665 // Dumptime base = 0x1000 and shift is 0. We have a region at address 0x2000. There's a 1666 // narrowOop P stored in this region that points to an object at address 0x2200. 1667 // P's encoded value is 0x1200. 1668 // 1669 // Runtime base = 0x4000 and shift is also 0. If we map this region at 0x5000, then 1670 // the value P can remain 0x1200. The decoded address = (0x4000 + (0x1200 << 0)) = 0x5200, 1671 // which is the runtime location of the referenced object. 1672 return /*runtime*/ (address)((uintptr_t)CompressedOops::base() + r->mapping_offset()); 1673 } else { 1674 // This was the hard-coded requested base address used at dump time. With uncompressed oops, 1675 // the heap range is assigned by the OS so we will most likely have to relocate anyway, no matter 1676 // what base address was picked at duump time. 1677 return (address)ArchiveHeapWriter::NOCOOPS_REQUESTED_BASE; 1678 } 1679 } 1680 1681 bool FileMapInfo::map_heap_region() { 1682 if (map_heap_region_impl()) { 1683 #ifdef ASSERT 1684 // The "old" regions must be parsable -- we cannot have any unused space 1685 // at the start of the lowest G1 region that contains archived objects. 1686 assert(is_aligned(_mapped_heap_memregion.start(), G1HeapRegion::GrainBytes), "must be"); 1687 1688 // Make sure we map at the very top of the heap - see comments in 1689 // init_heap_region_relocation(). 1690 MemRegion heap_range = G1CollectedHeap::heap()->reserved(); 1691 assert(heap_range.contains(_mapped_heap_memregion), "must be"); 1692 1693 address heap_end = (address)heap_range.end(); 1694 address mapped_heap_region_end = (address)_mapped_heap_memregion.end(); 1695 assert(heap_end >= mapped_heap_region_end, "must be"); 1696 assert(heap_end - mapped_heap_region_end < (intx)(G1HeapRegion::GrainBytes), 1697 "must be at the top of the heap to avoid fragmentation"); 1698 #endif 1699 1700 ArchiveHeapLoader::set_mapped(); 1701 return true; 1702 } else { 1703 return false; 1704 } 1705 } 1706 1707 bool FileMapInfo::map_heap_region_impl() { 1708 assert(UseG1GC, "the following code assumes G1"); 1709 1710 FileMapRegion* r = region_at(MetaspaceShared::hp); 1711 size_t size = r->used(); 1712 if (size == 0) { 1713 return false; // no archived java heap data 1714 } 1715 1716 size_t word_size = size / HeapWordSize; 1717 address requested_start = heap_region_requested_address(); 1718 1719 aot_log_info(aot)("Preferred address to map heap data (to avoid relocation) is " INTPTR_FORMAT, p2i(requested_start)); 1720 1721 // allocate from java heap 1722 HeapWord* start = G1CollectedHeap::heap()->alloc_archive_region(word_size, (HeapWord*)requested_start); 1723 if (start == nullptr) { 1724 MetaspaceShared::report_loading_error("UseSharedSpaces: Unable to allocate java heap region for archive heap."); 1725 return false; 1726 } 1727 1728 _mapped_heap_memregion = MemRegion(start, word_size); 1729 1730 // Map the archived heap data. No need to call MemTracker::record_virtual_memory_tag() 1731 // for mapped region as it is part of the reserved java heap, which is already recorded. 1732 char* addr = (char*)_mapped_heap_memregion.start(); 1733 char* base; 1734 1735 if (MetaspaceShared::use_windows_memory_mapping() || UseLargePages) { 1736 // With UseLargePages, memory mapping may fail on some OSes if the size is not 1737 // large page aligned, so let's use read() instead. In this case, the memory region 1738 // is already commited by G1 so we don't need to commit it again. 1739 if (!read_region(MetaspaceShared::hp, addr, 1740 align_up(_mapped_heap_memregion.byte_size(), os::vm_page_size()), 1741 /* do_commit = */ !UseLargePages)) { 1742 dealloc_heap_region(); 1743 aot_log_error(aot)("Failed to read archived heap region into " INTPTR_FORMAT, p2i(addr)); 1744 return false; 1745 } 1746 // Checks for VerifySharedSpaces is already done inside read_region() 1747 base = addr; 1748 } else { 1749 base = map_memory(_fd, _full_path, r->file_offset(), 1750 addr, _mapped_heap_memregion.byte_size(), r->read_only(), 1751 r->allow_exec(), mtJavaHeap); 1752 if (base == nullptr || base != addr) { 1753 dealloc_heap_region(); 1754 aot_log_info(aot)("UseSharedSpaces: Unable to map at required address in java heap. " 1755 INTPTR_FORMAT ", size = %zu bytes", 1756 p2i(addr), _mapped_heap_memregion.byte_size()); 1757 return false; 1758 } 1759 1760 if (VerifySharedSpaces && !r->check_region_crc(base)) { 1761 dealloc_heap_region(); 1762 MetaspaceShared::report_loading_error("UseSharedSpaces: mapped heap region is corrupt"); 1763 return false; 1764 } 1765 } 1766 1767 r->set_mapped_base(base); 1768 1769 // If the requested range is different from the range allocated by GC, then 1770 // the pointers need to be patched. 1771 address mapped_start = (address) _mapped_heap_memregion.start(); 1772 ptrdiff_t delta = mapped_start - requested_start; 1773 if (UseCompressedOops && 1774 (narrow_oop_mode() != CompressedOops::mode() || 1775 narrow_oop_shift() != CompressedOops::shift())) { 1776 _heap_pointers_need_patching = true; 1777 } 1778 if (delta != 0) { 1779 _heap_pointers_need_patching = true; 1780 } 1781 ArchiveHeapLoader::init_mapped_heap_info(mapped_start, delta, narrow_oop_shift()); 1782 1783 if (_heap_pointers_need_patching) { 1784 char* bitmap_base = map_bitmap_region(); 1785 if (bitmap_base == nullptr) { 1786 MetaspaceShared::report_loading_error("CDS heap cannot be used because bitmap region cannot be mapped"); 1787 dealloc_heap_region(); 1788 _heap_pointers_need_patching = false; 1789 return false; 1790 } 1791 } 1792 aot_log_info(aot)("Heap data mapped at " INTPTR_FORMAT ", size = %8zu bytes", 1793 p2i(mapped_start), _mapped_heap_memregion.byte_size()); 1794 aot_log_info(aot)("CDS heap data relocation delta = %zd bytes", delta); 1795 return true; 1796 } 1797 1798 narrowOop FileMapInfo::encoded_heap_region_dumptime_address() { 1799 assert(CDSConfig::is_using_archive(), "runtime only"); 1800 assert(UseCompressedOops, "sanity"); 1801 FileMapRegion* r = region_at(MetaspaceShared::hp); 1802 return CompressedOops::narrow_oop_cast(r->mapping_offset() >> narrow_oop_shift()); 1803 } 1804 1805 void FileMapInfo::patch_heap_embedded_pointers() { 1806 if (!ArchiveHeapLoader::is_mapped() || !_heap_pointers_need_patching) { 1807 return; 1808 } 1809 1810 char* bitmap_base = map_bitmap_region(); 1811 assert(bitmap_base != nullptr, "must have already been mapped"); 1812 1813 FileMapRegion* r = region_at(MetaspaceShared::hp); 1814 ArchiveHeapLoader::patch_embedded_pointers( 1815 this, _mapped_heap_memregion, 1816 (address)(region_at(MetaspaceShared::bm)->mapped_base()) + r->oopmap_offset(), 1817 r->oopmap_size_in_bits()); 1818 } 1819 1820 void FileMapInfo::fixup_mapped_heap_region() { 1821 if (ArchiveHeapLoader::is_mapped()) { 1822 assert(!_mapped_heap_memregion.is_empty(), "sanity"); 1823 1824 // Populate the archive regions' G1BlockOffsetTables. That ensures 1825 // fast G1BlockOffsetTable::block_start operations for any given address 1826 // within the archive regions when trying to find start of an object 1827 // (e.g. during card table scanning). 1828 G1CollectedHeap::heap()->populate_archive_regions_bot(_mapped_heap_memregion); 1829 } 1830 } 1831 1832 // dealloc the archive regions from java heap 1833 void FileMapInfo::dealloc_heap_region() { 1834 G1CollectedHeap::heap()->dealloc_archive_regions(_mapped_heap_memregion); 1835 } 1836 #endif // INCLUDE_CDS_JAVA_HEAP 1837 1838 void FileMapInfo::unmap_regions(int regions[], int num_regions) { 1839 for (int r = 0; r < num_regions; r++) { 1840 int idx = regions[r]; 1841 unmap_region(idx); 1842 } 1843 } 1844 1845 // Unmap a memory region in the address space. 1846 1847 void FileMapInfo::unmap_region(int i) { 1848 FileMapRegion* r = region_at(i); 1849 char* mapped_base = r->mapped_base(); 1850 size_t size = r->used_aligned(); 1851 1852 if (mapped_base != nullptr) { 1853 if (size > 0 && r->mapped_from_file()) { 1854 aot_log_info(aot)("Unmapping region #%d at base " INTPTR_FORMAT " (%s)", i, p2i(mapped_base), 1855 shared_region_name[i]); 1856 if (r->in_reserved_space()) { 1857 // This region was mapped inside a ReservedSpace. Its memory will be freed when the ReservedSpace 1858 // is released. Zero it so that we don't accidentally read its content. 1859 aot_log_info(aot)("Region #%d (%s) is in a reserved space, it will be freed when the space is released", i, shared_region_name[i]); 1860 } else { 1861 if (!os::unmap_memory(mapped_base, size)) { 1862 fatal("os::unmap_memory failed"); 1863 } 1864 } 1865 } 1866 r->set_mapped_base(nullptr); 1867 } 1868 } 1869 1870 void FileMapInfo::assert_mark(bool check) { 1871 if (!check) { 1872 MetaspaceShared::unrecoverable_loading_error("Mark mismatch while restoring from shared file."); 1873 } 1874 } 1875 1876 FileMapInfo* FileMapInfo::_current_info = nullptr; 1877 FileMapInfo* FileMapInfo::_dynamic_archive_info = nullptr; 1878 bool FileMapInfo::_heap_pointers_need_patching = false; 1879 bool FileMapInfo::_memory_mapping_failed = false; 1880 1881 // Open the shared archive file, read and validate the header 1882 // information (version, boot classpath, etc.). If initialization 1883 // fails, shared spaces are disabled and the file is closed. 1884 // 1885 // Validation of the archive is done in two steps: 1886 // 1887 // [1] validate_header() - done here. 1888 // [2] validate_shared_path_table - this is done later, because the table is in the RO 1889 // region of the archive, which is not mapped yet. 1890 bool FileMapInfo::open_as_input() { 1891 assert(CDSConfig::is_using_archive(), "UseSharedSpaces expected."); 1892 assert(Arguments::has_jimage(), "The shared archive file cannot be used with an exploded module build."); 1893 1894 if (JvmtiExport::should_post_class_file_load_hook() && JvmtiExport::has_early_class_hook_env()) { 1895 // CDS assumes that no classes resolved in vmClasses::resolve_all() 1896 // are replaced at runtime by JVMTI ClassFileLoadHook. All of those classes are resolved 1897 // during the JVMTI "early" stage, so we can still use CDS if 1898 // JvmtiExport::has_early_class_hook_env() is false. 1899 MetaspaceShared::report_loading_error("CDS is disabled because early JVMTI ClassFileLoadHook is in use."); 1900 return false; 1901 } 1902 1903 if (!open_for_read() || !init_from_file(_fd) || !validate_header()) { 1904 if (_is_static) { 1905 MetaspaceShared::report_loading_error("Loading static archive failed."); 1906 return false; 1907 } else { 1908 MetaspaceShared::report_loading_error("Loading dynamic archive failed."); 1909 if (AutoCreateSharedArchive) { 1910 CDSConfig::enable_dumping_dynamic_archive(_full_path); 1911 } 1912 return false; 1913 } 1914 } 1915 1916 return true; 1917 } 1918 1919 bool FileMapInfo::validate_aot_class_linking() { 1920 // These checks need to be done after FileMapInfo::initialize(), which gets called before Universe::heap() 1921 // is available. 1922 if (header()->has_aot_linked_classes()) { 1923 const char* archive_type = CDSConfig::type_of_archive_being_loaded(); 1924 CDSConfig::set_has_aot_linked_classes(true); 1925 if (JvmtiExport::should_post_class_file_load_hook()) { 1926 aot_log_error(aot)("%s has aot-linked classes. It cannot be used when JVMTI ClassFileLoadHook is in use.", 1927 archive_type); 1928 return false; 1929 } 1930 if (JvmtiExport::has_early_vmstart_env()) { 1931 aot_log_error(aot)("%s has aot-linked classes. It cannot be used when JVMTI early vm start is in use.", 1932 archive_type); 1933 return false; 1934 } 1935 if (!CDSConfig::is_using_full_module_graph()) { 1936 aot_log_error(aot)("%s has aot-linked classes. It cannot be used when archived full module graph is not used.", 1937 archive_type); 1938 return false; 1939 } 1940 1941 const char* prop = Arguments::get_property("java.security.manager"); 1942 if (prop != nullptr && strcmp(prop, "disallow") != 0) { 1943 aot_log_error(aot)("%s has aot-linked classes. It cannot be used with -Djava.security.manager=%s.", 1944 archive_type, prop); 1945 return false; 1946 } 1947 1948 if (header()->gc_kind() != (int)Universe::heap()->kind()) { 1949 log_error(cds)("CDS archive has aot-linked classes. It cannot be used because GC used during dump time (%s) is not the same as runtime (%s)", 1950 header()->gc_name(), Universe::heap()->name()); 1951 return false; 1952 } 1953 1954 #if INCLUDE_JVMTI 1955 if (Arguments::has_jdwp_agent()) { 1956 aot_log_error(aot)("%s has aot-linked classes. It cannot be used with JDWP agent", archive_type); 1957 return false; 1958 } 1959 #endif 1960 } 1961 1962 return true; 1963 } 1964 1965 // The 2 core spaces are RW->RO 1966 FileMapRegion* FileMapInfo::first_core_region() const { 1967 return region_at(MetaspaceShared::rw); 1968 } 1969 1970 FileMapRegion* FileMapInfo::last_core_region() const { 1971 return region_at(MetaspaceShared::ro); 1972 } 1973 1974 void FileMapInfo::print(outputStream* st) const { 1975 header()->print(st); 1976 if (!is_static()) { 1977 dynamic_header()->print(st); 1978 } 1979 } 1980 1981 void FileMapHeader::set_as_offset(char* p, size_t *offset) { 1982 *offset = ArchiveBuilder::current()->any_to_offset((address)p); 1983 } 1984 1985 int FileMapHeader::compute_crc() { 1986 char* start = (char*)this; 1987 // start computing from the field after _header_size to end of base archive name. 1988 char* buf = (char*)&(_generic_header._header_size) + sizeof(_generic_header._header_size); 1989 size_t sz = header_size() - (buf - start); 1990 int crc = ClassLoader::crc32(0, buf, (jint)sz); 1991 return crc; 1992 } 1993 1994 // This function should only be called during run time with UseSharedSpaces enabled. 1995 bool FileMapHeader::validate() { 1996 const char* file_type = CDSConfig::type_of_archive_being_loaded(); 1997 if (_obj_alignment != ObjectAlignmentInBytes) { 1998 aot_log_info(aot)("The %s's ObjectAlignmentInBytes of %d" 1999 " does not equal the current ObjectAlignmentInBytes of %d.", 2000 file_type, _obj_alignment, ObjectAlignmentInBytes); 2001 return false; 2002 } 2003 if (_compact_strings != CompactStrings) { 2004 aot_log_info(aot)("The %s's CompactStrings setting (%s)" 2005 " does not equal the current CompactStrings setting (%s).", file_type, 2006 _compact_strings ? "enabled" : "disabled", 2007 CompactStrings ? "enabled" : "disabled"); 2008 return false; 2009 } 2010 bool jvmci_compiler_is_enabled = CompilerConfig::is_jvmci_compiler_enabled(); 2011 CompilerType compiler_type = CompilerConfig::compiler_type(); 2012 CompilerType archive_compiler_type = CompilerType(_compiler_type); 2013 // JVMCI compiler does different type profiling settigns and generate 2014 // different code. We can't use archive which was produced 2015 // without it and reverse. 2016 // Only allow mix when JIT compilation is disabled. 2017 // Interpreter is used by default when dumping archive. 2018 bool intepreter_is_used = (archive_compiler_type == CompilerType::compiler_none) || 2019 (compiler_type == CompilerType::compiler_none); 2020 if (!intepreter_is_used && 2021 jvmci_compiler_is_enabled != (archive_compiler_type == CompilerType::compiler_jvmci)) { 2022 MetaspaceShared::report_loading_error("The %s's JIT compiler setting (%s)" 2023 " does not equal the current setting (%s).", file_type, 2024 compilertype2name(archive_compiler_type), compilertype2name(compiler_type)); 2025 return false; 2026 } 2027 if (TrainingData::have_data()) { 2028 if (_type_profile_level != TypeProfileLevel) { 2029 MetaspaceShared::report_loading_error("The %s's TypeProfileLevel setting (%d)" 2030 " does not equal the current TypeProfileLevel setting (%d).", file_type, 2031 _type_profile_level, TypeProfileLevel); 2032 return false; 2033 } 2034 if (_type_profile_args_limit != TypeProfileArgsLimit) { 2035 MetaspaceShared::report_loading_error("The %s's TypeProfileArgsLimit setting (%d)" 2036 " does not equal the current TypeProfileArgsLimit setting (%d).", file_type, 2037 _type_profile_args_limit, TypeProfileArgsLimit); 2038 return false; 2039 } 2040 if (_type_profile_parms_limit != TypeProfileParmsLimit) { 2041 MetaspaceShared::report_loading_error("The %s's TypeProfileParamsLimit setting (%d)" 2042 " does not equal the current TypeProfileParamsLimit setting (%d).", file_type, 2043 _type_profile_args_limit, TypeProfileArgsLimit); 2044 return false; 2045 2046 } 2047 if (_type_profile_width != TypeProfileWidth) { 2048 MetaspaceShared::report_loading_error("The %s's TypeProfileWidth setting (%d)" 2049 " does not equal the current TypeProfileWidth setting (%d).", file_type, 2050 (int)_type_profile_width, (int)TypeProfileWidth); 2051 return false; 2052 2053 } 2054 if (_bci_profile_width != BciProfileWidth) { 2055 MetaspaceShared::report_loading_error("The %s's BciProfileWidth setting (%d)" 2056 " does not equal the current BciProfileWidth setting (%d).", file_type, 2057 (int)_bci_profile_width, (int)BciProfileWidth); 2058 return false; 2059 } 2060 if (_type_profile_casts != TypeProfileCasts) { 2061 MetaspaceShared::report_loading_error("The %s's TypeProfileCasts setting (%s)" 2062 " does not equal the current TypeProfileCasts setting (%s).", file_type, 2063 _type_profile_casts ? "enabled" : "disabled", 2064 TypeProfileCasts ? "enabled" : "disabled"); 2065 2066 return false; 2067 2068 } 2069 if (_profile_traps != ProfileTraps) { 2070 MetaspaceShared::report_loading_error("The %s's ProfileTraps setting (%s)" 2071 " does not equal the current ProfileTraps setting (%s).", file_type, 2072 _profile_traps ? "enabled" : "disabled", 2073 ProfileTraps ? "enabled" : "disabled"); 2074 2075 return false; 2076 } 2077 if (_spec_trap_limit_extra_entries != SpecTrapLimitExtraEntries) { 2078 MetaspaceShared::report_loading_error("The %s's SpecTrapLimitExtraEntries setting (%d)" 2079 " does not equal the current SpecTrapLimitExtraEntries setting (%d).", file_type, 2080 _spec_trap_limit_extra_entries, SpecTrapLimitExtraEntries); 2081 return false; 2082 2083 } 2084 } 2085 2086 // This must be done after header validation because it might change the 2087 // header data 2088 const char* prop = Arguments::get_property("java.system.class.loader"); 2089 if (prop != nullptr) { 2090 if (has_aot_linked_classes()) { 2091 aot_log_error(aot)("%s has aot-linked classes. It cannot be used when the " 2092 "java.system.class.loader property is specified.", CDSConfig::type_of_archive_being_loaded()); 2093 return false; 2094 } 2095 aot_log_warning(aot)("Archived non-system classes are disabled because the " 2096 "java.system.class.loader property is specified (value = \"%s\"). " 2097 "To use archived non-system classes, this property must not be set", prop); 2098 _has_platform_or_app_classes = false; 2099 } 2100 2101 2102 if (!_verify_local && BytecodeVerificationLocal) { 2103 // we cannot load boot classes, so there's no point of using the CDS archive 2104 aot_log_info(aot)("The %s's BytecodeVerificationLocal setting (%s)" 2105 " does not equal the current BytecodeVerificationLocal setting (%s).", file_type, 2106 _verify_local ? "enabled" : "disabled", 2107 BytecodeVerificationLocal ? "enabled" : "disabled"); 2108 return false; 2109 } 2110 2111 // For backwards compatibility, we don't check the BytecodeVerificationRemote setting 2112 // if the archive only contains system classes. 2113 if (_has_platform_or_app_classes 2114 && !_verify_remote // we didn't verify the archived platform/app classes 2115 && BytecodeVerificationRemote) { // but we want to verify all loaded platform/app classes 2116 aot_log_info(aot)("The %s was created with less restrictive " 2117 "verification setting than the current setting.", file_type); 2118 // Pretend that we didn't have any archived platform/app classes, so they won't be loaded 2119 // by SystemDictionaryShared. 2120 _has_platform_or_app_classes = false; 2121 } 2122 2123 // Java agents are allowed during run time. Therefore, the following condition is not 2124 // checked: (!_allow_archiving_with_java_agent && AllowArchivingWithJavaAgent) 2125 // Note: _allow_archiving_with_java_agent is set in the shared archive during dump time 2126 // while AllowArchivingWithJavaAgent is set during the current run. 2127 if (_allow_archiving_with_java_agent && !AllowArchivingWithJavaAgent) { 2128 aot_log_warning(aot)("The setting of the AllowArchivingWithJavaAgent is different " 2129 "from the setting in the %s.", file_type); 2130 return false; 2131 } 2132 2133 if (_allow_archiving_with_java_agent) { 2134 aot_log_warning(aot)("This %s was created with AllowArchivingWithJavaAgent. It should be used " 2135 "for testing purposes only and should not be used in a production environment", file_type); 2136 } 2137 2138 aot_log_info(aot)("The %s was created with UseCompressedOops = %d, UseCompressedClassPointers = %d, UseCompactObjectHeaders = %d", 2139 file_type, compressed_oops(), compressed_class_pointers(), compact_headers()); 2140 if (compressed_oops() != UseCompressedOops || compressed_class_pointers() != UseCompressedClassPointers) { 2141 aot_log_warning(aot)("Unable to use %s.\nThe saved state of UseCompressedOops and UseCompressedClassPointers is " 2142 "different from runtime, CDS will be disabled.", file_type); 2143 return false; 2144 } 2145 2146 if (compact_headers() != UseCompactObjectHeaders) { 2147 aot_log_warning(aot)("Unable to use %s.\nThe %s's UseCompactObjectHeaders setting (%s)" 2148 " does not equal the current UseCompactObjectHeaders setting (%s).", file_type, file_type, 2149 _compact_headers ? "enabled" : "disabled", 2150 UseCompactObjectHeaders ? "enabled" : "disabled"); 2151 return false; 2152 } 2153 2154 if (!_use_optimized_module_handling && !CDSConfig::is_dumping_final_static_archive()) { 2155 CDSConfig::stop_using_optimized_module_handling(); 2156 aot_log_info(aot)("optimized module handling: disabled because archive was created without optimized module handling"); 2157 } 2158 2159 if (is_static()) { 2160 // Only the static archive can contain the full module graph. 2161 if (!_has_full_module_graph) { 2162 CDSConfig::stop_using_full_module_graph("archive was created without full module graph"); 2163 } 2164 2165 if (_has_archived_packages) { 2166 CDSConfig::set_is_loading_packages(); 2167 } 2168 if (_has_archived_protection_domains) { 2169 CDSConfig::set_is_loading_protection_domains(); 2170 } 2171 } 2172 2173 return true; 2174 } 2175 2176 bool FileMapInfo::validate_header() { 2177 if (!header()->validate()) { 2178 return false; 2179 } 2180 if (_is_static) { 2181 return true; 2182 } else { 2183 return DynamicArchive::validate(this); 2184 } 2185 } 2186 2187 #if INCLUDE_JVMTI 2188 ClassPathEntry** FileMapInfo::_classpath_entries_for_jvmti = nullptr; 2189 2190 ClassPathEntry* FileMapInfo::get_classpath_entry_for_jvmti(int i, TRAPS) { 2191 if (i == 0) { 2192 // index 0 corresponds to the ClassPathImageEntry which is a globally shared object 2193 // and should never be deleted. 2194 return ClassLoader::get_jrt_entry(); 2195 } 2196 ClassPathEntry* ent = _classpath_entries_for_jvmti[i]; 2197 if (ent == nullptr) { 2198 const AOTClassLocation* cl = AOTClassLocationConfig::runtime()->class_location_at(i); 2199 const char* path = cl->path(); 2200 struct stat st; 2201 if (os::stat(path, &st) != 0) { 2202 char *msg = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(path) + 128); 2203 jio_snprintf(msg, strlen(path) + 127, "error in finding JAR file %s", path); 2204 THROW_MSG_(vmSymbols::java_io_IOException(), msg, nullptr); 2205 } else { 2206 ent = ClassLoader::create_class_path_entry(THREAD, path, &st); 2207 if (ent == nullptr) { 2208 char *msg = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(path) + 128); 2209 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path); 2210 THROW_MSG_(vmSymbols::java_io_IOException(), msg, nullptr); 2211 } 2212 } 2213 2214 MutexLocker mu(THREAD, CDSClassFileStream_lock); 2215 if (_classpath_entries_for_jvmti[i] == nullptr) { 2216 _classpath_entries_for_jvmti[i] = ent; 2217 } else { 2218 // Another thread has beat me to creating this entry 2219 delete ent; 2220 ent = _classpath_entries_for_jvmti[i]; 2221 } 2222 } 2223 2224 return ent; 2225 } 2226 2227 ClassFileStream* FileMapInfo::open_stream_for_jvmti(InstanceKlass* ik, Handle class_loader, TRAPS) { 2228 int path_index = ik->shared_classpath_index(); 2229 assert(path_index >= 0, "should be called for shared built-in classes only"); 2230 assert(path_index < AOTClassLocationConfig::runtime()->length(), "sanity"); 2231 2232 ClassPathEntry* cpe = get_classpath_entry_for_jvmti(path_index, CHECK_NULL); 2233 assert(cpe != nullptr, "must be"); 2234 2235 Symbol* name = ik->name(); 2236 const char* const class_name = name->as_C_string(); 2237 const char* const file_name = ClassLoader::file_name_for_class_name(class_name, 2238 name->utf8_length()); 2239 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader()); 2240 const AOTClassLocation* cl = AOTClassLocationConfig::runtime()->class_location_at(path_index); 2241 ClassFileStream* cfs; 2242 if (class_loader() != nullptr && cl->is_multi_release_jar()) { 2243 // This class was loaded from a multi-release JAR file during dump time. The 2244 // process for finding its classfile is complex. Let's defer to the Java code 2245 // in java.lang.ClassLoader. 2246 cfs = get_stream_from_class_loader(class_loader, cpe, file_name, CHECK_NULL); 2247 } else { 2248 cfs = cpe->open_stream_for_loader(THREAD, file_name, loader_data); 2249 } 2250 assert(cfs != nullptr, "must be able to read the classfile data of shared classes for built-in loaders."); 2251 log_debug(aot, jvmti)("classfile data for %s [%d: %s] = %d bytes", class_name, path_index, 2252 cfs->source(), cfs->length()); 2253 return cfs; 2254 } 2255 2256 ClassFileStream* FileMapInfo::get_stream_from_class_loader(Handle class_loader, 2257 ClassPathEntry* cpe, 2258 const char* file_name, 2259 TRAPS) { 2260 JavaValue result(T_OBJECT); 2261 oop class_name = java_lang_String::create_oop_from_str(file_name, THREAD); 2262 Handle h_class_name = Handle(THREAD, class_name); 2263 2264 // byte[] ClassLoader.getResourceAsByteArray(String name) 2265 JavaCalls::call_virtual(&result, 2266 class_loader, 2267 vmClasses::ClassLoader_klass(), 2268 vmSymbols::getResourceAsByteArray_name(), 2269 vmSymbols::getResourceAsByteArray_signature(), 2270 h_class_name, 2271 CHECK_NULL); 2272 assert(result.get_type() == T_OBJECT, "just checking"); 2273 oop obj = result.get_oop(); 2274 assert(obj != nullptr, "ClassLoader.getResourceAsByteArray should not return null"); 2275 2276 // copy from byte[] to a buffer 2277 typeArrayOop ba = typeArrayOop(obj); 2278 jint len = ba->length(); 2279 u1* buffer = NEW_RESOURCE_ARRAY(u1, len); 2280 ArrayAccess<>::arraycopy_to_native<>(ba, typeArrayOopDesc::element_offset<jbyte>(0), buffer, len); 2281 2282 return new ClassFileStream(buffer, len, cpe->name()); 2283 } 2284 #endif