1 /* 2 * Copyright (c) 2003, 2024, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "cds/archiveBuilder.hpp" 27 #include "cds/archiveHeapLoader.inline.hpp" 28 #include "cds/archiveHeapWriter.hpp" 29 #include "cds/archiveUtils.inline.hpp" 30 #include "cds/cds_globals.hpp" 31 #include "cds/cdsConfig.hpp" 32 #include "cds/dynamicArchive.hpp" 33 #include "cds/filemap.hpp" 34 #include "cds/heapShared.hpp" 35 #include "cds/metaspaceShared.hpp" 36 #include "classfile/altHashing.hpp" 37 #include "classfile/classFileStream.hpp" 38 #include "classfile/classLoader.hpp" 39 #include "classfile/classLoader.inline.hpp" 40 #include "classfile/classLoaderData.inline.hpp" 41 #include "classfile/classLoaderExt.hpp" 42 #include "classfile/symbolTable.hpp" 43 #include "classfile/systemDictionaryShared.hpp" 44 #include "classfile/vmClasses.hpp" 45 #include "classfile/vmSymbols.hpp" 46 #include "jvm.h" 47 #include "logging/log.hpp" 48 #include "logging/logMessage.hpp" 49 #include "logging/logStream.hpp" 50 #include "memory/iterator.inline.hpp" 51 #include "memory/metadataFactory.hpp" 52 #include "memory/metaspaceClosure.hpp" 53 #include "memory/oopFactory.hpp" 54 #include "memory/universe.hpp" 55 #include "nmt/memTracker.hpp" 56 #include "oops/compressedOops.hpp" 57 #include "oops/compressedOops.inline.hpp" 58 #include "oops/objArrayOop.hpp" 59 #include "oops/oop.inline.hpp" 60 #include "prims/jvmtiExport.hpp" 61 #include "runtime/arguments.hpp" 62 #include "runtime/globals_extension.hpp" 63 #include "runtime/java.hpp" 64 #include "runtime/mutexLocker.hpp" 65 #include "runtime/os.hpp" 66 #include "runtime/vm_version.hpp" 67 #include "utilities/align.hpp" 68 #include "utilities/bitMap.inline.hpp" 69 #include "utilities/classpathStream.hpp" 70 #include "utilities/defaultStream.hpp" 71 #include "utilities/ostream.hpp" 72 #if INCLUDE_G1GC 73 #include "gc/g1/g1CollectedHeap.hpp" 74 #include "gc/g1/g1HeapRegion.hpp" 75 #endif 76 77 # include <sys/stat.h> 78 # include <errno.h> 79 80 #ifndef O_BINARY // if defined (Win32) use binary files. 81 #define O_BINARY 0 // otherwise do nothing. 82 #endif 83 84 // Fill in the fileMapInfo structure with data about this VM instance. 85 86 // This method copies the vm version info into header_version. If the version is too 87 // long then a truncated version, which has a hash code appended to it, is copied. 88 // 89 // Using a template enables this method to verify that header_version is an array of 90 // length JVM_IDENT_MAX. This ensures that the code that writes to the CDS file and 91 // the code that reads the CDS file will both use the same size buffer. Hence, will 92 // use identical truncation. This is necessary for matching of truncated versions. 93 template <int N> static void get_header_version(char (&header_version) [N]) { 94 assert(N == JVM_IDENT_MAX, "Bad header_version size"); 95 96 const char *vm_version = VM_Version::internal_vm_info_string(); 97 const int version_len = (int)strlen(vm_version); 98 99 memset(header_version, 0, JVM_IDENT_MAX); 100 101 if (version_len < (JVM_IDENT_MAX-1)) { 102 strcpy(header_version, vm_version); 103 104 } else { 105 // Get the hash value. Use a static seed because the hash needs to return the same 106 // value over multiple jvm invocations. 107 uint32_t hash = AltHashing::halfsiphash_32(8191, (const uint8_t*)vm_version, version_len); 108 109 // Truncate the ident, saving room for the 8 hex character hash value. 110 strncpy(header_version, vm_version, JVM_IDENT_MAX-9); 111 112 // Append the hash code as eight hex digits. 113 os::snprintf_checked(&header_version[JVM_IDENT_MAX-9], 9, "%08x", hash); 114 header_version[JVM_IDENT_MAX-1] = 0; // Null terminate. 115 } 116 117 assert(header_version[JVM_IDENT_MAX-1] == 0, "must be"); 118 } 119 120 FileMapInfo::FileMapInfo(const char* full_path, bool is_static) : 121 _is_static(is_static), _file_open(false), _is_mapped(false), _fd(-1), _file_offset(0), 122 _full_path(full_path), _base_archive_name(nullptr), _header(nullptr) { 123 if (_is_static) { 124 assert(_current_info == nullptr, "must be singleton"); // not thread safe 125 _current_info = this; 126 } else { 127 assert(_dynamic_archive_info == nullptr, "must be singleton"); // not thread safe 128 _dynamic_archive_info = this; 129 } 130 } 131 132 FileMapInfo::~FileMapInfo() { 133 if (_is_static) { 134 assert(_current_info == this, "must be singleton"); // not thread safe 135 _current_info = nullptr; 136 } else { 137 assert(_dynamic_archive_info == this, "must be singleton"); // not thread safe 138 _dynamic_archive_info = nullptr; 139 } 140 141 if (_header != nullptr) { 142 os::free(_header); 143 } 144 145 if (_file_open) { 146 ::close(_fd); 147 } 148 } 149 150 void FileMapInfo::populate_header(size_t core_region_alignment) { 151 assert(_header == nullptr, "Sanity check"); 152 size_t c_header_size; 153 size_t header_size; 154 size_t base_archive_name_size = 0; 155 size_t base_archive_name_offset = 0; 156 size_t longest_common_prefix_size = 0; 157 if (is_static()) { 158 c_header_size = sizeof(FileMapHeader); 159 header_size = c_header_size; 160 } else { 161 // dynamic header including base archive name for non-default base archive 162 c_header_size = sizeof(DynamicArchiveHeader); 163 header_size = c_header_size; 164 165 const char* default_base_archive_name = CDSConfig::default_archive_path(); 166 const char* current_base_archive_name = CDSConfig::static_archive_path(); 167 if (!os::same_files(current_base_archive_name, default_base_archive_name)) { 168 base_archive_name_size = strlen(current_base_archive_name) + 1; 169 header_size += base_archive_name_size; 170 base_archive_name_offset = c_header_size; 171 } 172 } 173 ResourceMark rm; 174 GrowableArray<const char*>* app_cp_array = create_dumptime_app_classpath_array(); 175 int len = app_cp_array->length(); 176 longest_common_prefix_size = longest_common_app_classpath_prefix_len(len, app_cp_array); 177 _header = (FileMapHeader*)os::malloc(header_size, mtInternal); 178 memset((void*)_header, 0, header_size); 179 _header->populate(this, 180 core_region_alignment, 181 header_size, 182 base_archive_name_size, 183 base_archive_name_offset, 184 longest_common_prefix_size); 185 } 186 187 void FileMapHeader::populate(FileMapInfo *info, size_t core_region_alignment, 188 size_t header_size, size_t base_archive_name_size, 189 size_t base_archive_name_offset, size_t common_app_classpath_prefix_size) { 190 // 1. We require _generic_header._magic to be at the beginning of the file 191 // 2. FileMapHeader also assumes that _generic_header is at the beginning of the file 192 assert(offset_of(FileMapHeader, _generic_header) == 0, "must be"); 193 set_header_size((unsigned int)header_size); 194 set_base_archive_name_offset((unsigned int)base_archive_name_offset); 195 set_base_archive_name_size((unsigned int)base_archive_name_size); 196 set_common_app_classpath_prefix_size((unsigned int)common_app_classpath_prefix_size); 197 set_magic(CDSConfig::is_dumping_dynamic_archive() ? CDS_DYNAMIC_ARCHIVE_MAGIC : CDS_ARCHIVE_MAGIC); 198 set_version(CURRENT_CDS_ARCHIVE_VERSION); 199 200 if (!info->is_static() && base_archive_name_size != 0) { 201 // copy base archive name 202 copy_base_archive_name(CDSConfig::static_archive_path()); 203 } 204 _core_region_alignment = core_region_alignment; 205 _obj_alignment = ObjectAlignmentInBytes; 206 _compact_strings = CompactStrings; 207 if (CDSConfig::is_dumping_heap()) { 208 _narrow_oop_mode = CompressedOops::mode(); 209 _narrow_oop_base = CompressedOops::base(); 210 _narrow_oop_shift = CompressedOops::shift(); 211 } 212 _compressed_oops = UseCompressedOops; 213 _compressed_class_ptrs = UseCompressedClassPointers; 214 _use_secondary_supers_table = UseSecondarySupersTable; 215 _max_heap_size = MaxHeapSize; 216 _use_optimized_module_handling = CDSConfig::is_using_optimized_module_handling(); 217 _has_aot_linked_classes = CDSConfig::is_dumping_aot_linked_classes(); 218 _has_full_module_graph = CDSConfig::is_dumping_full_module_graph(); 219 _has_archived_invokedynamic = CDSConfig::is_dumping_invokedynamic(); 220 _has_archived_packages = CDSConfig::is_dumping_packages(); 221 _has_archived_protection_domains = CDSConfig::is_dumping_protection_domains(); 222 _gc_kind = (int)Universe::heap()->kind(); 223 jio_snprintf(_gc_name, sizeof(_gc_name), Universe::heap()->name()); 224 225 // The following fields are for sanity checks for whether this archive 226 // will function correctly with this JVM and the bootclasspath it's 227 // invoked with. 228 229 // JVM version string ... changes on each build. 230 get_header_version(_jvm_ident); 231 232 _app_class_paths_start_index = ClassLoaderExt::app_class_paths_start_index(); 233 _app_module_paths_start_index = ClassLoaderExt::app_module_paths_start_index(); 234 _max_used_path_index = ClassLoaderExt::max_used_path_index(); 235 _num_module_paths = ClassLoader::num_module_path_entries(); 236 237 _verify_local = BytecodeVerificationLocal; 238 _verify_remote = BytecodeVerificationRemote; 239 _has_platform_or_app_classes = ClassLoaderExt::has_platform_or_app_classes(); 240 _has_non_jar_in_classpath = ClassLoaderExt::has_non_jar_in_classpath(); 241 _requested_base_address = (char*)SharedBaseAddress; 242 _mapped_base_address = (char*)SharedBaseAddress; 243 _allow_archiving_with_java_agent = AllowArchivingWithJavaAgent; 244 245 if (!CDSConfig::is_dumping_dynamic_archive()) { 246 set_shared_path_table(info->_shared_path_table); 247 } 248 } 249 250 void FileMapHeader::copy_base_archive_name(const char* archive) { 251 assert(base_archive_name_size() != 0, "_base_archive_name_size not set"); 252 assert(base_archive_name_offset() != 0, "_base_archive_name_offset not set"); 253 assert(header_size() > sizeof(*this), "_base_archive_name_size not included in header size?"); 254 memcpy((char*)this + base_archive_name_offset(), archive, base_archive_name_size()); 255 } 256 257 void FileMapHeader::print(outputStream* st) { 258 ResourceMark rm; 259 260 st->print_cr("- magic: 0x%08x", magic()); 261 st->print_cr("- crc: 0x%08x", crc()); 262 st->print_cr("- version: 0x%x", version()); 263 st->print_cr("- header_size: " UINT32_FORMAT, header_size()); 264 st->print_cr("- common_app_classpath_size: " UINT32_FORMAT, common_app_classpath_prefix_size()); 265 st->print_cr("- base_archive_name_offset: " UINT32_FORMAT, base_archive_name_offset()); 266 st->print_cr("- base_archive_name_size: " UINT32_FORMAT, base_archive_name_size()); 267 268 for (int i = 0; i < NUM_CDS_REGIONS; i++) { 269 FileMapRegion* r = region_at(i); 270 r->print(st, i); 271 } 272 st->print_cr("============ end regions ======== "); 273 274 st->print_cr("- core_region_alignment: " SIZE_FORMAT, _core_region_alignment); 275 st->print_cr("- obj_alignment: %d", _obj_alignment); 276 st->print_cr("- narrow_oop_base: " INTPTR_FORMAT, p2i(_narrow_oop_base)); 277 st->print_cr("- narrow_oop_shift %d", _narrow_oop_shift); 278 st->print_cr("- compact_strings: %d", _compact_strings); 279 st->print_cr("- max_heap_size: " UINTX_FORMAT, _max_heap_size); 280 st->print_cr("- narrow_oop_mode: %d", _narrow_oop_mode); 281 st->print_cr("- compressed_oops: %d", _compressed_oops); 282 st->print_cr("- compressed_class_ptrs: %d", _compressed_class_ptrs); 283 st->print_cr("- use_secondary_supers_table: %d", _use_secondary_supers_table); 284 st->print_cr("- cloned_vtables_offset: " SIZE_FORMAT_X, _cloned_vtables_offset); 285 st->print_cr("- serialized_data_offset: " SIZE_FORMAT_X, _serialized_data_offset); 286 st->print_cr("- jvm_ident: %s", _jvm_ident); 287 st->print_cr("- shared_path_table_offset: " SIZE_FORMAT_X, _shared_path_table_offset); 288 st->print_cr("- app_class_paths_start_index: %d", _app_class_paths_start_index); 289 st->print_cr("- app_module_paths_start_index: %d", _app_module_paths_start_index); 290 st->print_cr("- num_module_paths: %d", _num_module_paths); 291 st->print_cr("- max_used_path_index: %d", _max_used_path_index); 292 st->print_cr("- verify_local: %d", _verify_local); 293 st->print_cr("- verify_remote: %d", _verify_remote); 294 st->print_cr("- has_platform_or_app_classes: %d", _has_platform_or_app_classes); 295 st->print_cr("- has_non_jar_in_classpath: %d", _has_non_jar_in_classpath); 296 st->print_cr("- requested_base_address: " INTPTR_FORMAT, p2i(_requested_base_address)); 297 st->print_cr("- mapped_base_address: " INTPTR_FORMAT, p2i(_mapped_base_address)); 298 st->print_cr("- heap_root_segments.roots_count: %d" , _heap_root_segments.roots_count()); 299 st->print_cr("- heap_root_segments.base_offset: " SIZE_FORMAT_X, _heap_root_segments.base_offset()); 300 st->print_cr("- heap_root_segments.count: " SIZE_FORMAT, _heap_root_segments.count()); 301 st->print_cr("- heap_root_segments.max_size_elems: %d", _heap_root_segments.max_size_in_elems()); 302 st->print_cr("- heap_root_segments.max_size_bytes: %d", _heap_root_segments.max_size_in_bytes()); 303 st->print_cr("- _heap_oopmap_start_pos: " SIZE_FORMAT, _heap_oopmap_start_pos); 304 st->print_cr("- _heap_ptrmap_start_pos: " SIZE_FORMAT, _heap_ptrmap_start_pos); 305 st->print_cr("- _rw_ptrmap_start_pos: " SIZE_FORMAT, _rw_ptrmap_start_pos); 306 st->print_cr("- _ro_ptrmap_start_pos: " SIZE_FORMAT, _ro_ptrmap_start_pos); 307 st->print_cr("- allow_archiving_with_java_agent:%d", _allow_archiving_with_java_agent); 308 st->print_cr("- use_optimized_module_handling: %d", _use_optimized_module_handling); 309 st->print_cr("- has_full_module_graph %d", _has_full_module_graph); 310 st->print_cr("- has_aot_linked_classes %d", _has_aot_linked_classes); 311 st->print_cr("- has_archived_invokedynamic %d", _has_archived_invokedynamic); 312 st->print_cr("- has_archived_packages %d", _has_archived_packages); 313 st->print_cr("- has_archived_protection_domains %d", _has_archived_protection_domains); 314 st->print_cr("- ptrmap_size_in_bits: " SIZE_FORMAT, _ptrmap_size_in_bits); 315 } 316 317 void SharedClassPathEntry::init_as_non_existent(const char* path, TRAPS) { 318 _type = non_existent_entry; 319 set_name(path, CHECK); 320 } 321 322 void SharedClassPathEntry::init(bool is_modules_image, 323 bool is_module_path, 324 ClassPathEntry* cpe, TRAPS) { 325 assert(CDSConfig::is_dumping_archive(), "sanity"); 326 _timestamp = 0; 327 _filesize = 0; 328 _from_class_path_attr = false; 329 330 struct stat st; 331 if (os::stat(cpe->name(), &st) == 0) { 332 if ((st.st_mode & S_IFMT) == S_IFDIR) { 333 _type = dir_entry; 334 } else { 335 // The timestamp of the modules_image is not checked at runtime. 336 if (is_modules_image) { 337 _type = modules_image_entry; 338 } else { 339 _type = jar_entry; 340 _timestamp = st.st_mtime; 341 _from_class_path_attr = cpe->from_class_path_attr(); 342 } 343 _filesize = st.st_size; 344 _is_module_path = is_module_path; 345 } 346 } else { 347 // The file/dir must exist, or it would not have been added 348 // into ClassLoader::classpath_entry(). 349 // 350 // If we can't access a jar file in the boot path, then we can't 351 // make assumptions about where classes get loaded from. 352 log_error(cds)("Unable to open file %s.", cpe->name()); 353 MetaspaceShared::unrecoverable_loading_error(); 354 } 355 356 // No need to save the name of the module file, as it will be computed at run time 357 // to allow relocation of the JDK directory. 358 const char* name = is_modules_image ? "" : cpe->name(); 359 set_name(name, CHECK); 360 } 361 362 void SharedClassPathEntry::set_name(const char* name, TRAPS) { 363 size_t len = strlen(name) + 1; 364 _name = MetadataFactory::new_array<char>(ClassLoaderData::the_null_class_loader_data(), (int)len, CHECK); 365 strcpy(_name->data(), name); 366 } 367 368 void SharedClassPathEntry::copy_from(SharedClassPathEntry* ent, ClassLoaderData* loader_data, TRAPS) { 369 assert(ent != nullptr, "sanity"); 370 _type = ent->_type; 371 _is_module_path = ent->_is_module_path; 372 _timestamp = ent->_timestamp; 373 _filesize = ent->_filesize; 374 _from_class_path_attr = ent->_from_class_path_attr; 375 set_name(ent->name(), CHECK); 376 377 if (ent->is_jar() && ent->manifest() != nullptr) { 378 Array<u1>* buf = MetadataFactory::new_array<u1>(loader_data, 379 ent->manifest_size(), 380 CHECK); 381 char* p = (char*)(buf->data()); 382 memcpy(p, ent->manifest(), ent->manifest_size()); 383 set_manifest(buf); 384 } 385 } 386 387 const char* SharedClassPathEntry::name() const { 388 if (CDSConfig::is_using_archive() && is_modules_image()) { 389 // In order to validate the runtime modules image file size against the archived 390 // size information, we need to obtain the runtime modules image path. The recorded 391 // dump time modules image path in the archive may be different from the runtime path 392 // if the JDK image has beed moved after generating the archive. 393 return ClassLoader::get_jrt_entry()->name(); 394 } else { 395 return _name->data(); 396 } 397 } 398 399 bool SharedClassPathEntry::validate(bool is_class_path) const { 400 assert(CDSConfig::is_using_archive(), "runtime only"); 401 402 struct stat st; 403 const char* name = this->name(); 404 405 bool ok = true; 406 log_info(class, path)("checking shared classpath entry: %s", name); 407 if (os::stat(name, &st) != 0 && is_class_path) { 408 // If the archived module path entry does not exist at runtime, it is not fatal 409 // (no need to invalid the shared archive) because the shared runtime visibility check 410 // filters out any archived module classes that do not have a matching runtime 411 // module path location. 412 log_warning(cds)("Required classpath entry does not exist: %s", name); 413 ok = false; 414 } else if (is_dir()) { 415 if (!os::dir_is_empty(name)) { 416 log_warning(cds)("directory is not empty: %s", name); 417 ok = false; 418 } 419 } else { 420 bool size_differs = _filesize != st.st_size; 421 bool time_differs = has_timestamp() && _timestamp != st.st_mtime; 422 if (time_differs || size_differs) { 423 ok = false; 424 if (PrintSharedArchiveAndExit) { 425 log_warning(cds)(time_differs ? "Timestamp mismatch" : "File size mismatch"); 426 } else { 427 const char* bad_file_msg = "This file is not the one used while building the shared archive file:"; 428 log_warning(cds)("%s %s", bad_file_msg, name); 429 if (!log_is_enabled(Info, cds)) { 430 log_warning(cds)("%s %s", bad_file_msg, name); 431 } 432 if (time_differs) { 433 log_warning(cds)("%s timestamp has changed.", name); 434 } 435 if (size_differs) { 436 log_warning(cds)("%s size has changed.", name); 437 } 438 } 439 } 440 } 441 442 if (PrintSharedArchiveAndExit && !ok) { 443 // If PrintSharedArchiveAndExit is enabled, don't report failure to the 444 // caller. Please see above comments for more details. 445 ok = true; 446 MetaspaceShared::set_archive_loading_failed(); 447 } 448 return ok; 449 } 450 451 bool SharedClassPathEntry::check_non_existent() const { 452 assert(_type == non_existent_entry, "must be"); 453 log_info(class, path)("should be non-existent: %s", name()); 454 struct stat st; 455 if (os::stat(name(), &st) != 0) { 456 log_info(class, path)("ok"); 457 return true; // file doesn't exist 458 } else { 459 return false; 460 } 461 } 462 463 void SharedClassPathEntry::metaspace_pointers_do(MetaspaceClosure* it) { 464 it->push(&_name); 465 it->push(&_manifest); 466 } 467 468 void SharedPathTable::metaspace_pointers_do(MetaspaceClosure* it) { 469 it->push(&_entries); 470 } 471 472 void SharedPathTable::dumptime_init(ClassLoaderData* loader_data, TRAPS) { 473 const int num_entries = 474 ClassLoader::num_boot_classpath_entries() + 475 ClassLoader::num_app_classpath_entries() + 476 ClassLoader::num_module_path_entries() + 477 FileMapInfo::num_non_existent_class_paths(); 478 _entries = MetadataFactory::new_array<SharedClassPathEntry*>(loader_data, num_entries, CHECK); 479 for (int i = 0; i < num_entries; i++) { 480 SharedClassPathEntry* ent = 481 new (loader_data, SharedClassPathEntry::size(), MetaspaceObj::SharedClassPathEntryType, THREAD) SharedClassPathEntry; 482 _entries->at_put(i, ent); 483 } 484 } 485 486 void FileMapInfo::allocate_shared_path_table(TRAPS) { 487 assert(CDSConfig::is_dumping_archive(), "sanity"); 488 489 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 490 ClassPathEntry* jrt = ClassLoader::get_jrt_entry(); 491 492 assert(jrt != nullptr, 493 "No modular java runtime image present when allocating the CDS classpath entry table"); 494 495 _shared_path_table.dumptime_init(loader_data, CHECK); 496 497 // 1. boot class path 498 int i = 0; 499 i = add_shared_classpaths(i, "boot", jrt, CHECK); 500 i = add_shared_classpaths(i, "app", ClassLoader::app_classpath_entries(), CHECK); 501 i = add_shared_classpaths(i, "module", ClassLoader::module_path_entries(), CHECK); 502 503 for (int x = 0; x < num_non_existent_class_paths(); x++, i++) { 504 const char* path = _non_existent_class_paths->at(x); 505 shared_path(i)->init_as_non_existent(path, CHECK); 506 } 507 508 assert(i == _shared_path_table.size(), "number of shared path entry mismatch"); 509 } 510 511 int FileMapInfo::add_shared_classpaths(int i, const char* which, ClassPathEntry *cpe, TRAPS) { 512 while (cpe != nullptr) { 513 bool is_jrt = (cpe == ClassLoader::get_jrt_entry()); 514 bool is_module_path = i >= ClassLoaderExt::app_module_paths_start_index(); 515 const char* type = (is_jrt ? "jrt" : (cpe->is_jar_file() ? "jar" : "dir")); 516 log_info(class, path)("add %s shared path (%s) %s", which, type, cpe->name()); 517 SharedClassPathEntry* ent = shared_path(i); 518 ent->init(is_jrt, is_module_path, cpe, CHECK_0); 519 if (cpe->is_jar_file()) { 520 update_jar_manifest(cpe, ent, CHECK_0); 521 } 522 if (is_jrt) { 523 cpe = ClassLoader::get_next_boot_classpath_entry(cpe); 524 } else { 525 cpe = cpe->next(); 526 } 527 i++; 528 } 529 530 return i; 531 } 532 533 void FileMapInfo::check_nonempty_dir_in_shared_path_table() { 534 assert(CDSConfig::is_dumping_archive(), "sanity"); 535 536 bool has_nonempty_dir = false; 537 538 int last = _shared_path_table.size() - 1; 539 if (last > ClassLoaderExt::max_used_path_index()) { 540 // no need to check any path beyond max_used_path_index 541 last = ClassLoaderExt::max_used_path_index(); 542 } 543 544 for (int i = 0; i <= last; i++) { 545 SharedClassPathEntry *e = shared_path(i); 546 if (e->is_dir()) { 547 const char* path = e->name(); 548 if (!os::dir_is_empty(path)) { 549 log_error(cds)("Error: non-empty directory '%s'", path); 550 has_nonempty_dir = true; 551 } 552 } 553 } 554 555 if (has_nonempty_dir) { 556 ClassLoader::exit_with_path_failure("Cannot have non-empty directory in paths", nullptr); 557 } 558 } 559 560 void FileMapInfo::record_non_existent_class_path_entry(const char* path) { 561 assert(CDSConfig::is_dumping_archive(), "sanity"); 562 log_info(class, path)("non-existent Class-Path entry %s", path); 563 if (_non_existent_class_paths == nullptr) { 564 _non_existent_class_paths = new (mtClass) GrowableArray<const char*>(10, mtClass); 565 } 566 _non_existent_class_paths->append(os::strdup(path)); 567 } 568 569 int FileMapInfo::num_non_existent_class_paths() { 570 assert(CDSConfig::is_dumping_archive(), "sanity"); 571 if (_non_existent_class_paths != nullptr) { 572 return _non_existent_class_paths->length(); 573 } else { 574 return 0; 575 } 576 } 577 578 int FileMapInfo::get_module_shared_path_index(Symbol* location) { 579 if (location == nullptr) { 580 return 0; // Used by java/lang/reflect/Proxy$ProxyBuilder 581 } 582 if (location->starts_with("jrt:", 4) && get_number_of_shared_paths() > 0) { 583 assert(shared_path(0)->is_modules_image(), "first shared_path must be the modules image"); 584 return 0; 585 } 586 587 if (ClassLoaderExt::app_module_paths_start_index() >= get_number_of_shared_paths()) { 588 // The archive(s) were created without --module-path option 589 return -1; 590 } 591 592 if (!location->starts_with("file:", 5)) { 593 return -1; 594 } 595 596 // skip_uri_protocol was also called during dump time -- see ClassLoaderExt::process_module_table() 597 ResourceMark rm; 598 const char* file = ClassLoader::uri_to_path(location->as_C_string()); 599 for (int i = ClassLoaderExt::app_module_paths_start_index(); i < get_number_of_shared_paths(); i++) { 600 SharedClassPathEntry* ent = shared_path(i); 601 if (!ent->is_non_existent()) { 602 assert(ent->in_named_module(), "must be"); 603 bool cond = strcmp(file, ent->name()) == 0; 604 log_debug(class, path)("get_module_shared_path_index (%d) %s : %s = %s", i, 605 location->as_C_string(), ent->name(), cond ? "same" : "different"); 606 if (cond) { 607 return i; 608 } 609 } 610 } 611 612 return -1; 613 } 614 615 class ManifestStream: public ResourceObj { 616 private: 617 u1* _buffer_start; // Buffer bottom 618 u1* _buffer_end; // Buffer top (one past last element) 619 u1* _current; // Current buffer position 620 621 public: 622 // Constructor 623 ManifestStream(u1* buffer, int length) : _buffer_start(buffer), 624 _current(buffer) { 625 _buffer_end = buffer + length; 626 } 627 628 static bool is_attr(u1* attr, const char* name) { 629 return strncmp((const char*)attr, name, strlen(name)) == 0; 630 } 631 632 static char* copy_attr(u1* value, size_t len) { 633 char* buf = NEW_RESOURCE_ARRAY(char, len + 1); 634 strncpy(buf, (char*)value, len); 635 buf[len] = 0; 636 return buf; 637 } 638 }; 639 640 void FileMapInfo::update_jar_manifest(ClassPathEntry *cpe, SharedClassPathEntry* ent, TRAPS) { 641 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 642 ResourceMark rm(THREAD); 643 jint manifest_size; 644 645 assert(cpe->is_jar_file() && ent->is_jar(), "the shared class path entry is not a JAR file"); 646 char* manifest = ClassLoaderExt::read_manifest(THREAD, cpe, &manifest_size); 647 if (manifest != nullptr) { 648 ManifestStream* stream = new ManifestStream((u1*)manifest, 649 manifest_size); 650 // Copy the manifest into the shared archive 651 manifest = ClassLoaderExt::read_raw_manifest(THREAD, cpe, &manifest_size); 652 Array<u1>* buf = MetadataFactory::new_array<u1>(loader_data, 653 manifest_size, 654 CHECK); 655 char* p = (char*)(buf->data()); 656 memcpy(p, manifest, manifest_size); 657 ent->set_manifest(buf); 658 } 659 } 660 661 char* FileMapInfo::skip_first_path_entry(const char* path) { 662 size_t path_sep_len = strlen(os::path_separator()); 663 char* p = strstr((char*)path, os::path_separator()); 664 if (p != nullptr) { 665 debug_only( { 666 size_t image_name_len = strlen(MODULES_IMAGE_NAME); 667 assert(strncmp(p - image_name_len, MODULES_IMAGE_NAME, image_name_len) == 0, 668 "first entry must be the modules image"); 669 } ); 670 p += path_sep_len; 671 } else { 672 debug_only( { 673 assert(ClassLoader::string_ends_with(path, MODULES_IMAGE_NAME), 674 "first entry must be the modules image"); 675 } ); 676 } 677 return p; 678 } 679 680 int FileMapInfo::num_paths(const char* path) { 681 if (path == nullptr) { 682 return 0; 683 } 684 int npaths = 1; 685 char* p = (char*)path; 686 while (p != nullptr) { 687 char* prev = p; 688 p = strstr((char*)p, os::path_separator()); 689 if (p != nullptr) { 690 p++; 691 // don't count empty path 692 if ((p - prev) > 1) { 693 npaths++; 694 } 695 } 696 } 697 return npaths; 698 } 699 700 // Returns true if a path within the paths exists and has non-zero size. 701 bool FileMapInfo::check_paths_existence(const char* paths) { 702 ClasspathStream cp_stream(paths); 703 bool exist = false; 704 struct stat st; 705 while (cp_stream.has_next()) { 706 const char* path = cp_stream.get_next(); 707 if (os::stat(path, &st) == 0 && st.st_size > 0) { 708 exist = true; 709 break; 710 } 711 } 712 return exist; 713 } 714 715 GrowableArray<const char*>* FileMapInfo::create_dumptime_app_classpath_array() { 716 assert(CDSConfig::is_dumping_archive(), "sanity"); 717 GrowableArray<const char*>* path_array = new GrowableArray<const char*>(10); 718 ClassPathEntry* cpe = ClassLoader::app_classpath_entries(); 719 while (cpe != nullptr) { 720 path_array->append(cpe->name()); 721 cpe = cpe->next(); 722 } 723 return path_array; 724 } 725 726 GrowableArray<const char*>* FileMapInfo::create_path_array(const char* paths) { 727 GrowableArray<const char*>* path_array = new GrowableArray<const char*>(10); 728 JavaThread* current = JavaThread::current(); 729 ClasspathStream cp_stream(paths); 730 bool non_jar_in_cp = header()->has_non_jar_in_classpath(); 731 while (cp_stream.has_next()) { 732 const char* path = cp_stream.get_next(); 733 if (!non_jar_in_cp) { 734 struct stat st; 735 if (os::stat(path, &st) == 0) { 736 path_array->append(path); 737 } 738 } else { 739 const char* canonical_path = ClassLoader::get_canonical_path(path, current); 740 if (canonical_path != nullptr) { 741 char* error_msg = nullptr; 742 jzfile* zip = ClassLoader::open_zip_file(canonical_path, &error_msg, current); 743 if (zip != nullptr && error_msg == nullptr) { 744 path_array->append(path); 745 } 746 } 747 } 748 } 749 return path_array; 750 } 751 752 bool FileMapInfo::classpath_failure(const char* msg, const char* name) { 753 ClassLoader::trace_class_path(msg, name); 754 if (PrintSharedArchiveAndExit) { 755 MetaspaceShared::set_archive_loading_failed(); 756 } 757 return false; 758 } 759 760 unsigned int FileMapInfo::longest_common_app_classpath_prefix_len(int num_paths, 761 GrowableArray<const char*>* rp_array) { 762 if (num_paths == 0) { 763 return 0; 764 } 765 unsigned int pos; 766 for (pos = 0; ; pos++) { 767 for (int i = 0; i < num_paths; i++) { 768 if (rp_array->at(i)[pos] != '\0' && rp_array->at(i)[pos] == rp_array->at(0)[pos]) { 769 continue; 770 } 771 // search backward for the pos before the file separator char 772 while (pos > 0) { 773 if (rp_array->at(0)[--pos] == *os::file_separator()) { 774 return pos + 1; 775 } 776 } 777 return 0; 778 } 779 } 780 return 0; 781 } 782 783 bool FileMapInfo::check_paths(int shared_path_start_idx, int num_paths, GrowableArray<const char*>* rp_array, 784 unsigned int dumptime_prefix_len, unsigned int runtime_prefix_len) { 785 int i = 0; 786 int j = shared_path_start_idx; 787 while (i < num_paths) { 788 while (shared_path(j)->from_class_path_attr()) { 789 // shared_path(j) was expanded from the JAR file attribute "Class-Path:" 790 // during dump time. It's not included in the -classpath VM argument. 791 j++; 792 } 793 assert(strlen(shared_path(j)->name()) > (size_t)dumptime_prefix_len, "sanity"); 794 const char* dumptime_path = shared_path(j)->name() + dumptime_prefix_len; 795 assert(strlen(rp_array->at(i)) > (size_t)runtime_prefix_len, "sanity"); 796 const char* runtime_path = rp_array->at(i) + runtime_prefix_len; 797 if (!os::same_files(dumptime_path, runtime_path)) { 798 return false; 799 } 800 i++; 801 j++; 802 } 803 return true; 804 } 805 806 bool FileMapInfo::validate_boot_class_paths() { 807 // 808 // - Archive contains boot classes only - relaxed boot path check: 809 // Extra path elements appended to the boot path at runtime are allowed. 810 // 811 // - Archive contains application or platform classes - strict boot path check: 812 // Validate the entire runtime boot path, which must be compatible 813 // with the dump time boot path. Appending boot path at runtime is not 814 // allowed. 815 // 816 817 // The first entry in boot path is the modules_image (guaranteed by 818 // ClassLoader::setup_boot_search_path()). Skip the first entry. The 819 // path of the runtime modules_image may be different from the dump 820 // time path (e.g. the JDK image is copied to a different location 821 // after generating the shared archive), which is acceptable. For most 822 // common cases, the dump time boot path might contain modules_image only. 823 char* runtime_boot_path = Arguments::get_boot_class_path(); 824 char* rp = skip_first_path_entry(runtime_boot_path); 825 assert(shared_path(0)->is_modules_image(), "first shared_path must be the modules image"); 826 int dp_len = header()->app_class_paths_start_index() - 1; // ignore the first path to the module image 827 bool match = true; 828 829 bool relaxed_check = !header()->has_platform_or_app_classes(); 830 if (dp_len == 0 && rp == nullptr) { 831 return true; // ok, both runtime and dump time boot paths have modules_images only 832 } else if (dp_len == 0 && rp != nullptr) { 833 if (relaxed_check) { 834 return true; // ok, relaxed check, runtime has extra boot append path entries 835 } else { 836 ResourceMark rm; 837 if (check_paths_existence(rp)) { 838 // If a path exists in the runtime boot paths, it is considered a mismatch 839 // since there's no boot path specified during dump time. 840 match = false; 841 } 842 } 843 } else if (dp_len > 0 && rp != nullptr) { 844 int num; 845 ResourceMark rm; 846 GrowableArray<const char*>* rp_array = create_path_array(rp); 847 int rp_len = rp_array->length(); 848 if (rp_len >= dp_len) { 849 if (relaxed_check) { 850 // only check the leading entries in the runtime boot path, up to 851 // the length of the dump time boot path 852 num = dp_len; 853 } else { 854 // check the full runtime boot path, must match with dump time 855 num = rp_len; 856 } 857 match = check_paths(1, num, rp_array, 0, 0); 858 } else { 859 // create_path_array() ignores non-existing paths. Although the dump time and runtime boot classpath lengths 860 // are the same initially, after the call to create_path_array(), the runtime boot classpath length could become 861 // shorter. We consider boot classpath mismatch in this case. 862 match = false; 863 } 864 } 865 866 if (!match) { 867 // The paths are different 868 return classpath_failure("[BOOT classpath mismatch, actual =", runtime_boot_path); 869 } 870 return true; 871 } 872 873 bool FileMapInfo::validate_app_class_paths(int shared_app_paths_len) { 874 const char *appcp = Arguments::get_appclasspath(); 875 assert(appcp != nullptr, "null app classpath"); 876 int rp_len = num_paths(appcp); 877 bool match = false; 878 if (rp_len < shared_app_paths_len) { 879 return classpath_failure("Run time APP classpath is shorter than the one at dump time: ", appcp); 880 } 881 if (shared_app_paths_len != 0 && rp_len != 0) { 882 // Prefix is OK: E.g., dump with -cp foo.jar, but run with -cp foo.jar:bar.jar. 883 ResourceMark rm; 884 GrowableArray<const char*>* rp_array = create_path_array(appcp); 885 if (rp_array->length() == 0) { 886 // None of the jar file specified in the runtime -cp exists. 887 return classpath_failure("None of the jar file specified in the runtime -cp exists: -Djava.class.path=", appcp); 888 } 889 if (rp_array->length() < shared_app_paths_len) { 890 // create_path_array() ignores non-existing paths. Although the dump time and runtime app classpath lengths 891 // are the same initially, after the call to create_path_array(), the runtime app classpath length could become 892 // shorter. We consider app classpath mismatch in this case. 893 return classpath_failure("[APP classpath mismatch, actual: -Djava.class.path=", appcp); 894 } 895 896 // Handling of non-existent entries in the classpath: we eliminate all the non-existent 897 // entries from both the dump time classpath (ClassLoader::update_class_path_entry_list) 898 // and the runtime classpath (FileMapInfo::create_path_array), and check the remaining 899 // entries. E.g.: 900 // 901 // dump : -cp a.jar:NE1:NE2:b.jar -> a.jar:b.jar -> recorded in archive. 902 // run 1: -cp NE3:a.jar:NE4:b.jar -> a.jar:b.jar -> matched 903 // run 2: -cp x.jar:NE4:b.jar -> x.jar:b.jar -> mismatched 904 905 int j = header()->app_class_paths_start_index(); 906 match = check_paths(j, shared_app_paths_len, rp_array, 0, 0); 907 if (!match) { 908 // To facilitate app deployment, we allow the JAR files to be moved *together* to 909 // a different location, as long as they are still stored under the same directory 910 // structure. E.g., the following is OK. 911 // java -Xshare:dump -cp /a/Foo.jar:/a/b/Bar.jar ... 912 // java -Xshare:auto -cp /x/y/Foo.jar:/x/y/b/Bar.jar ... 913 unsigned int dumptime_prefix_len = header()->common_app_classpath_prefix_size(); 914 unsigned int runtime_prefix_len = longest_common_app_classpath_prefix_len(shared_app_paths_len, rp_array); 915 if (dumptime_prefix_len != 0 || runtime_prefix_len != 0) { 916 log_info(class, path)("LCP length for app classpath (dumptime: %u, runtime: %u)", 917 dumptime_prefix_len, runtime_prefix_len); 918 match = check_paths(j, shared_app_paths_len, rp_array, 919 dumptime_prefix_len, runtime_prefix_len); 920 } 921 if (!match) { 922 return classpath_failure("[APP classpath mismatch, actual: -Djava.class.path=", appcp); 923 } 924 } 925 } 926 return true; 927 } 928 929 void FileMapInfo::log_paths(const char* msg, int start_idx, int end_idx) { 930 LogTarget(Info, class, path) lt; 931 if (lt.is_enabled()) { 932 LogStream ls(lt); 933 ls.print("%s", msg); 934 const char* prefix = ""; 935 for (int i = start_idx; i < end_idx; i++) { 936 ls.print("%s%s", prefix, shared_path(i)->name()); 937 prefix = os::path_separator(); 938 } 939 ls.cr(); 940 } 941 } 942 943 void FileMapInfo::extract_module_paths(const char* runtime_path, GrowableArray<const char*>* module_paths) { 944 GrowableArray<const char*>* path_array = create_path_array(runtime_path); 945 int num_paths = path_array->length(); 946 for (int i = 0; i < num_paths; i++) { 947 const char* name = path_array->at(i); 948 ClassLoaderExt::extract_jar_files_from_path(name, module_paths); 949 } 950 // module paths are stored in sorted order in the CDS archive. 951 module_paths->sort(ClassLoaderExt::compare_module_path_by_name); 952 } 953 954 bool FileMapInfo::check_module_paths() { 955 const char* runtime_path = Arguments::get_property("jdk.module.path"); 956 int archived_num_module_paths = header()->num_module_paths(); 957 if (runtime_path == nullptr && archived_num_module_paths == 0) { 958 return true; 959 } 960 if ((runtime_path == nullptr && archived_num_module_paths > 0) || 961 (runtime_path != nullptr && archived_num_module_paths == 0)) { 962 return false; 963 } 964 ResourceMark rm; 965 GrowableArray<const char*>* module_paths = new GrowableArray<const char*>(3); 966 extract_module_paths(runtime_path, module_paths); 967 int num_paths = module_paths->length(); 968 if (num_paths != archived_num_module_paths) { 969 return false; 970 } 971 return check_paths(header()->app_module_paths_start_index(), num_paths, module_paths, 0, 0); 972 } 973 974 bool FileMapInfo::validate_shared_path_table() { 975 assert(CDSConfig::is_using_archive(), "runtime only"); 976 977 _validating_shared_path_table = true; 978 979 // Load the shared path table info from the archive header 980 _shared_path_table = header()->shared_path_table(); 981 982 bool matched_module_paths = true; 983 if (CDSConfig::is_dumping_dynamic_archive() || header()->has_full_module_graph()) { 984 matched_module_paths = check_module_paths(); 985 } 986 if (header()->has_full_module_graph() && !matched_module_paths) { 987 CDSConfig::stop_using_optimized_module_handling(); 988 log_info(cds)("optimized module handling: disabled because of mismatched module paths"); 989 } 990 991 if (CDSConfig::is_dumping_dynamic_archive()) { 992 // Only support dynamic dumping with the usage of the default CDS archive 993 // or a simple base archive. 994 // If the base layer archive contains additional path component besides 995 // the runtime image and the -cp, dynamic dumping is disabled. 996 // 997 // When dynamic archiving is enabled, the _shared_path_table is overwritten 998 // to include the application path and stored in the top layer archive. 999 assert(shared_path(0)->is_modules_image(), "first shared_path must be the modules image"); 1000 if (header()->app_class_paths_start_index() > 1) { 1001 CDSConfig::disable_dumping_dynamic_archive(); 1002 log_warning(cds)( 1003 "Dynamic archiving is disabled because base layer archive has appended boot classpath"); 1004 } 1005 if (header()->num_module_paths() > 0) { 1006 if (!matched_module_paths) { 1007 CDSConfig::disable_dumping_dynamic_archive(); 1008 log_warning(cds)( 1009 "Dynamic archiving is disabled because base layer archive has a different module path"); 1010 } 1011 } 1012 } 1013 1014 log_paths("Expecting BOOT path=", 0, header()->app_class_paths_start_index()); 1015 log_paths("Expecting -Djava.class.path=", header()->app_class_paths_start_index(), header()->app_module_paths_start_index()); 1016 1017 int module_paths_start_index = header()->app_module_paths_start_index(); 1018 int shared_app_paths_len = 0; 1019 1020 // validate the path entries up to the _max_used_path_index 1021 for (int i=0; i < header()->max_used_path_index() + 1; i++) { 1022 if (i < module_paths_start_index) { 1023 if (shared_path(i)->validate()) { 1024 // Only count the app class paths not from the "Class-path" attribute of a jar manifest. 1025 if (!shared_path(i)->from_class_path_attr() && i >= header()->app_class_paths_start_index()) { 1026 shared_app_paths_len++; 1027 } 1028 log_info(class, path)("ok"); 1029 } else { 1030 if (_dynamic_archive_info != nullptr && _dynamic_archive_info->_is_static) { 1031 assert(!CDSConfig::is_using_archive(), "UseSharedSpaces should be disabled"); 1032 } 1033 return false; 1034 } 1035 } else if (i >= module_paths_start_index) { 1036 if (shared_path(i)->validate(false /* not a class path entry */)) { 1037 log_info(class, path)("ok"); 1038 } else { 1039 if (_dynamic_archive_info != nullptr && _dynamic_archive_info->_is_static) { 1040 assert(!CDSConfig::is_using_archive(), "UseSharedSpaces should be disabled"); 1041 } 1042 return false; 1043 } 1044 } 1045 } 1046 1047 if (header()->max_used_path_index() == 0) { 1048 // default archive only contains the module image in the bootclasspath 1049 assert(shared_path(0)->is_modules_image(), "first shared_path must be the modules image"); 1050 } else { 1051 if (!validate_boot_class_paths() || !validate_app_class_paths(shared_app_paths_len)) { 1052 const char* mismatch_msg = "shared class paths mismatch"; 1053 const char* hint_msg = log_is_enabled(Info, class, path) ? 1054 "" : " (hint: enable -Xlog:class+path=info to diagnose the failure)"; 1055 if (RequireSharedSpaces) { 1056 log_error(cds)("%s%s", mismatch_msg, hint_msg); 1057 MetaspaceShared::unrecoverable_loading_error(); 1058 } else { 1059 log_warning(cds)("%s%s", mismatch_msg, hint_msg); 1060 } 1061 return false; 1062 } 1063 } 1064 1065 if (!validate_non_existent_class_paths()) { 1066 return false; 1067 } 1068 1069 _validating_shared_path_table = false; 1070 1071 #if INCLUDE_JVMTI 1072 if (_classpath_entries_for_jvmti != nullptr) { 1073 os::free(_classpath_entries_for_jvmti); 1074 } 1075 size_t sz = sizeof(ClassPathEntry*) * get_number_of_shared_paths(); 1076 _classpath_entries_for_jvmti = (ClassPathEntry**)os::malloc(sz, mtClass); 1077 memset((void*)_classpath_entries_for_jvmti, 0, sz); 1078 #endif 1079 1080 return true; 1081 } 1082 1083 bool FileMapInfo::validate_non_existent_class_paths() { 1084 // All of the recorded non-existent paths came from the Class-Path: attribute from the JAR 1085 // files on the app classpath. If any of these are found to exist during runtime, 1086 // it will change how classes are loading for the app loader. For safety, disable 1087 // loading of archived platform/app classes (currently there's no way to disable just the 1088 // app classes). 1089 1090 assert(CDSConfig::is_using_archive(), "runtime only"); 1091 for (int i = header()->app_module_paths_start_index() + header()->num_module_paths(); 1092 i < get_number_of_shared_paths(); 1093 i++) { 1094 SharedClassPathEntry* ent = shared_path(i); 1095 if (!ent->check_non_existent()) { 1096 if (header()->has_aot_linked_classes()) { 1097 log_error(cds)("CDS archive has aot-linked classes. It cannot be used because the " 1098 "file %s exists", ent->name()); 1099 return false; 1100 } else { 1101 log_warning(cds)("Archived non-system classes are disabled because the " 1102 "file %s exists", ent->name()); 1103 header()->set_has_platform_or_app_classes(false); 1104 } 1105 } 1106 } 1107 1108 return true; 1109 } 1110 1111 // A utility class for reading/validating the GenericCDSFileMapHeader portion of 1112 // a CDS archive's header. The file header of all CDS archives with versions from 1113 // CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION (12) are guaranteed to always start 1114 // with GenericCDSFileMapHeader. This makes it possible to read important information 1115 // from a CDS archive created by a different version of HotSpot, so that we can 1116 // automatically regenerate the archive as necessary (JDK-8261455). 1117 class FileHeaderHelper { 1118 int _fd; 1119 bool _is_valid; 1120 bool _is_static; 1121 GenericCDSFileMapHeader* _header; 1122 const char* _archive_name; 1123 const char* _base_archive_name; 1124 1125 public: 1126 FileHeaderHelper(const char* archive_name, bool is_static) { 1127 _fd = -1; 1128 _is_valid = false; 1129 _header = nullptr; 1130 _base_archive_name = nullptr; 1131 _archive_name = archive_name; 1132 _is_static = is_static; 1133 } 1134 1135 ~FileHeaderHelper() { 1136 if (_header != nullptr) { 1137 FREE_C_HEAP_ARRAY(char, _header); 1138 } 1139 if (_fd != -1) { 1140 ::close(_fd); 1141 } 1142 } 1143 1144 bool initialize() { 1145 assert(_archive_name != nullptr, "Archive name is null"); 1146 _fd = os::open(_archive_name, O_RDONLY | O_BINARY, 0); 1147 if (_fd < 0) { 1148 log_info(cds)("Specified shared archive not found (%s)", _archive_name); 1149 return false; 1150 } 1151 return initialize(_fd); 1152 } 1153 1154 // for an already opened file, do not set _fd 1155 bool initialize(int fd) { 1156 assert(_archive_name != nullptr, "Archive name is null"); 1157 assert(fd != -1, "Archive must be opened already"); 1158 // First read the generic header so we know the exact size of the actual header. 1159 GenericCDSFileMapHeader gen_header; 1160 size_t size = sizeof(GenericCDSFileMapHeader); 1161 os::lseek(fd, 0, SEEK_SET); 1162 size_t n = ::read(fd, (void*)&gen_header, (unsigned int)size); 1163 if (n != size) { 1164 log_warning(cds)("Unable to read generic CDS file map header from shared archive"); 1165 return false; 1166 } 1167 1168 if (gen_header._magic != CDS_ARCHIVE_MAGIC && 1169 gen_header._magic != CDS_DYNAMIC_ARCHIVE_MAGIC) { 1170 log_warning(cds)("The shared archive file has a bad magic number: %#x", gen_header._magic); 1171 return false; 1172 } 1173 1174 if (gen_header._version < CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION) { 1175 log_warning(cds)("Cannot handle shared archive file version 0x%x. Must be at least 0x%x.", 1176 gen_header._version, CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION); 1177 return false; 1178 } 1179 1180 if (gen_header._version != CURRENT_CDS_ARCHIVE_VERSION) { 1181 log_warning(cds)("The shared archive file version 0x%x does not match the required version 0x%x.", 1182 gen_header._version, CURRENT_CDS_ARCHIVE_VERSION); 1183 } 1184 1185 size_t filelen = os::lseek(fd, 0, SEEK_END); 1186 if (gen_header._header_size >= filelen) { 1187 log_warning(cds)("Archive file header larger than archive file"); 1188 return false; 1189 } 1190 1191 // Read the actual header and perform more checks 1192 size = gen_header._header_size; 1193 _header = (GenericCDSFileMapHeader*)NEW_C_HEAP_ARRAY(char, size, mtInternal); 1194 os::lseek(fd, 0, SEEK_SET); 1195 n = ::read(fd, (void*)_header, (unsigned int)size); 1196 if (n != size) { 1197 log_warning(cds)("Unable to read actual CDS file map header from shared archive"); 1198 return false; 1199 } 1200 1201 if (!check_header_crc()) { 1202 return false; 1203 } 1204 1205 if (!check_and_init_base_archive_name()) { 1206 return false; 1207 } 1208 1209 // All fields in the GenericCDSFileMapHeader has been validated. 1210 _is_valid = true; 1211 return true; 1212 } 1213 1214 GenericCDSFileMapHeader* get_generic_file_header() { 1215 assert(_header != nullptr && _is_valid, "must be a valid archive file"); 1216 return _header; 1217 } 1218 1219 const char* base_archive_name() { 1220 assert(_header != nullptr && _is_valid, "must be a valid archive file"); 1221 return _base_archive_name; 1222 } 1223 1224 private: 1225 bool check_header_crc() const { 1226 if (VerifySharedSpaces) { 1227 FileMapHeader* header = (FileMapHeader*)_header; 1228 int actual_crc = header->compute_crc(); 1229 if (actual_crc != header->crc()) { 1230 log_info(cds)("_crc expected: %d", header->crc()); 1231 log_info(cds)(" actual: %d", actual_crc); 1232 log_warning(cds)("Header checksum verification failed."); 1233 return false; 1234 } 1235 } 1236 return true; 1237 } 1238 1239 bool check_and_init_base_archive_name() { 1240 unsigned int name_offset = _header->_base_archive_name_offset; 1241 unsigned int name_size = _header->_base_archive_name_size; 1242 unsigned int header_size = _header->_header_size; 1243 1244 if (name_offset + name_size < name_offset) { 1245 log_warning(cds)("base_archive_name offset/size overflow: " UINT32_FORMAT "/" UINT32_FORMAT, 1246 name_offset, name_size); 1247 return false; 1248 } 1249 if (_header->_magic == CDS_ARCHIVE_MAGIC) { 1250 if (name_offset != 0) { 1251 log_warning(cds)("static shared archive must have zero _base_archive_name_offset"); 1252 return false; 1253 } 1254 if (name_size != 0) { 1255 log_warning(cds)("static shared archive must have zero _base_archive_name_size"); 1256 return false; 1257 } 1258 } else { 1259 assert(_header->_magic == CDS_DYNAMIC_ARCHIVE_MAGIC, "must be"); 1260 if ((name_size == 0 && name_offset != 0) || 1261 (name_size != 0 && name_offset == 0)) { 1262 // If either is zero, both must be zero. This indicates that we are using the default base archive. 1263 log_warning(cds)("Invalid base_archive_name offset/size: " UINT32_FORMAT "/" UINT32_FORMAT, 1264 name_offset, name_size); 1265 return false; 1266 } 1267 if (name_size > 0) { 1268 if (name_offset + name_size > header_size) { 1269 log_warning(cds)("Invalid base_archive_name offset/size (out of range): " 1270 UINT32_FORMAT " + " UINT32_FORMAT " > " UINT32_FORMAT , 1271 name_offset, name_size, header_size); 1272 return false; 1273 } 1274 const char* name = ((const char*)_header) + _header->_base_archive_name_offset; 1275 if (name[name_size - 1] != '\0' || strlen(name) != name_size - 1) { 1276 log_warning(cds)("Base archive name is damaged"); 1277 return false; 1278 } 1279 if (!os::file_exists(name)) { 1280 log_warning(cds)("Base archive %s does not exist", name); 1281 return false; 1282 } 1283 _base_archive_name = name; 1284 } 1285 } 1286 1287 return true; 1288 } 1289 }; 1290 1291 // Return value: 1292 // false: 1293 // <archive_name> is not a valid archive. *base_archive_name is set to null. 1294 // true && (*base_archive_name) == nullptr: 1295 // <archive_name> is a valid static archive. 1296 // true && (*base_archive_name) != nullptr: 1297 // <archive_name> is a valid dynamic archive. 1298 bool FileMapInfo::get_base_archive_name_from_header(const char* archive_name, 1299 char** base_archive_name) { 1300 FileHeaderHelper file_helper(archive_name, false); 1301 *base_archive_name = nullptr; 1302 1303 if (!file_helper.initialize()) { 1304 return false; 1305 } 1306 GenericCDSFileMapHeader* header = file_helper.get_generic_file_header(); 1307 if (header->_magic != CDS_DYNAMIC_ARCHIVE_MAGIC) { 1308 assert(header->_magic == CDS_ARCHIVE_MAGIC, "must be"); 1309 if (AutoCreateSharedArchive) { 1310 log_warning(cds)("AutoCreateSharedArchive is ignored because %s is a static archive", archive_name); 1311 } 1312 return true; 1313 } 1314 1315 const char* base = file_helper.base_archive_name(); 1316 if (base == nullptr) { 1317 *base_archive_name = CDSConfig::default_archive_path(); 1318 } else { 1319 *base_archive_name = os::strdup_check_oom(base); 1320 } 1321 1322 return true; 1323 } 1324 1325 // Read the FileMapInfo information from the file. 1326 1327 bool FileMapInfo::init_from_file(int fd) { 1328 FileHeaderHelper file_helper(_full_path, _is_static); 1329 if (!file_helper.initialize(fd)) { 1330 log_warning(cds)("Unable to read the file header."); 1331 return false; 1332 } 1333 GenericCDSFileMapHeader* gen_header = file_helper.get_generic_file_header(); 1334 1335 if (_is_static) { 1336 if (gen_header->_magic != CDS_ARCHIVE_MAGIC) { 1337 log_warning(cds)("Not a base shared archive: %s", _full_path); 1338 return false; 1339 } 1340 } else { 1341 if (gen_header->_magic != CDS_DYNAMIC_ARCHIVE_MAGIC) { 1342 log_warning(cds)("Not a top shared archive: %s", _full_path); 1343 return false; 1344 } 1345 } 1346 1347 _header = (FileMapHeader*)os::malloc(gen_header->_header_size, mtInternal); 1348 os::lseek(fd, 0, SEEK_SET); // reset to begin of the archive 1349 size_t size = gen_header->_header_size; 1350 size_t n = ::read(fd, (void*)_header, (unsigned int)size); 1351 if (n != size) { 1352 log_warning(cds)("Failed to read file header from the top archive file\n"); 1353 return false; 1354 } 1355 1356 if (header()->version() != CURRENT_CDS_ARCHIVE_VERSION) { 1357 log_info(cds)("_version expected: 0x%x", CURRENT_CDS_ARCHIVE_VERSION); 1358 log_info(cds)(" actual: 0x%x", header()->version()); 1359 log_warning(cds)("The shared archive file has the wrong version."); 1360 return false; 1361 } 1362 1363 int common_path_size = header()->common_app_classpath_prefix_size(); 1364 if (common_path_size < 0) { 1365 log_warning(cds)("common app classpath prefix len < 0"); 1366 return false; 1367 } 1368 1369 unsigned int base_offset = header()->base_archive_name_offset(); 1370 unsigned int name_size = header()->base_archive_name_size(); 1371 unsigned int header_size = header()->header_size(); 1372 if (base_offset != 0 && name_size != 0) { 1373 if (header_size != base_offset + name_size) { 1374 log_info(cds)("_header_size: " UINT32_FORMAT, header_size); 1375 log_info(cds)("common_app_classpath_size: " UINT32_FORMAT, header()->common_app_classpath_prefix_size()); 1376 log_info(cds)("base_archive_name_size: " UINT32_FORMAT, header()->base_archive_name_size()); 1377 log_info(cds)("base_archive_name_offset: " UINT32_FORMAT, header()->base_archive_name_offset()); 1378 log_warning(cds)("The shared archive file has an incorrect header size."); 1379 return false; 1380 } 1381 } 1382 1383 const char* actual_ident = header()->jvm_ident(); 1384 1385 if (actual_ident[JVM_IDENT_MAX-1] != 0) { 1386 log_warning(cds)("JVM version identifier is corrupted."); 1387 return false; 1388 } 1389 1390 char expected_ident[JVM_IDENT_MAX]; 1391 get_header_version(expected_ident); 1392 if (strncmp(actual_ident, expected_ident, JVM_IDENT_MAX-1) != 0) { 1393 log_info(cds)("_jvm_ident expected: %s", expected_ident); 1394 log_info(cds)(" actual: %s", actual_ident); 1395 log_warning(cds)("The shared archive file was created by a different" 1396 " version or build of HotSpot"); 1397 return false; 1398 } 1399 1400 _file_offset = header()->header_size(); // accounts for the size of _base_archive_name 1401 1402 size_t len = os::lseek(fd, 0, SEEK_END); 1403 1404 for (int i = 0; i < MetaspaceShared::n_regions; i++) { 1405 FileMapRegion* r = region_at(i); 1406 if (r->file_offset() > len || len - r->file_offset() < r->used()) { 1407 log_warning(cds)("The shared archive file has been truncated."); 1408 return false; 1409 } 1410 } 1411 1412 return true; 1413 } 1414 1415 void FileMapInfo::seek_to_position(size_t pos) { 1416 if (os::lseek(_fd, (long)pos, SEEK_SET) < 0) { 1417 log_error(cds)("Unable to seek to position " SIZE_FORMAT, pos); 1418 MetaspaceShared::unrecoverable_loading_error(); 1419 } 1420 } 1421 1422 // Read the FileMapInfo information from the file. 1423 bool FileMapInfo::open_for_read() { 1424 if (_file_open) { 1425 return true; 1426 } 1427 log_info(cds)("trying to map %s", _full_path); 1428 int fd = os::open(_full_path, O_RDONLY | O_BINARY, 0); 1429 if (fd < 0) { 1430 if (errno == ENOENT) { 1431 log_info(cds)("Specified shared archive not found (%s)", _full_path); 1432 } else { 1433 log_warning(cds)("Failed to open shared archive file (%s)", 1434 os::strerror(errno)); 1435 } 1436 return false; 1437 } else { 1438 log_info(cds)("Opened archive %s.", _full_path); 1439 } 1440 1441 _fd = fd; 1442 _file_open = true; 1443 return true; 1444 } 1445 1446 // Write the FileMapInfo information to the file. 1447 1448 void FileMapInfo::open_for_write() { 1449 LogMessage(cds) msg; 1450 if (msg.is_info()) { 1451 msg.info("Dumping shared data to file: "); 1452 msg.info(" %s", _full_path); 1453 } 1454 1455 #ifdef _WINDOWS // On Windows, need WRITE permission to remove the file. 1456 chmod(_full_path, _S_IREAD | _S_IWRITE); 1457 #endif 1458 1459 // Use remove() to delete the existing file because, on Unix, this will 1460 // allow processes that have it open continued access to the file. 1461 remove(_full_path); 1462 int fd = os::open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0444); 1463 if (fd < 0) { 1464 log_error(cds)("Unable to create shared archive file %s: (%s).", _full_path, 1465 os::strerror(errno)); 1466 MetaspaceShared::writing_error(); 1467 return; 1468 } 1469 _fd = fd; 1470 _file_open = true; 1471 1472 // Seek past the header. We will write the header after all regions are written 1473 // and their CRCs computed. 1474 size_t header_bytes = header()->header_size(); 1475 1476 header_bytes = align_up(header_bytes, MetaspaceShared::core_region_alignment()); 1477 _file_offset = header_bytes; 1478 seek_to_position(_file_offset); 1479 } 1480 1481 // Write the header to the file, seek to the next allocation boundary. 1482 1483 void FileMapInfo::write_header() { 1484 _file_offset = 0; 1485 seek_to_position(_file_offset); 1486 assert(is_file_position_aligned(), "must be"); 1487 write_bytes(header(), header()->header_size()); 1488 } 1489 1490 size_t FileMapRegion::used_aligned() const { 1491 return align_up(used(), MetaspaceShared::core_region_alignment()); 1492 } 1493 1494 void FileMapRegion::init(int region_index, size_t mapping_offset, size_t size, bool read_only, 1495 bool allow_exec, int crc) { 1496 _is_heap_region = HeapShared::is_heap_region(region_index); 1497 _is_bitmap_region = (region_index == MetaspaceShared::bm); 1498 _mapping_offset = mapping_offset; 1499 _used = size; 1500 _read_only = read_only; 1501 _allow_exec = allow_exec; 1502 _crc = crc; 1503 _mapped_from_file = false; 1504 _mapped_base = nullptr; 1505 } 1506 1507 void FileMapRegion::init_oopmap(size_t offset, size_t size_in_bits) { 1508 _oopmap_offset = offset; 1509 _oopmap_size_in_bits = size_in_bits; 1510 } 1511 1512 void FileMapRegion::init_ptrmap(size_t offset, size_t size_in_bits) { 1513 _ptrmap_offset = offset; 1514 _ptrmap_size_in_bits = size_in_bits; 1515 } 1516 1517 bool FileMapRegion::check_region_crc(char* base) const { 1518 // This function should be called after the region has been properly 1519 // loaded into memory via FileMapInfo::map_region() or FileMapInfo::read_region(). 1520 // I.e., this->mapped_base() must be valid. 1521 size_t sz = used(); 1522 if (sz == 0) { 1523 return true; 1524 } 1525 1526 assert(base != nullptr, "must be initialized"); 1527 int crc = ClassLoader::crc32(0, base, (jint)sz); 1528 if (crc != this->crc()) { 1529 log_warning(cds)("Checksum verification failed."); 1530 return false; 1531 } 1532 return true; 1533 } 1534 1535 static const char* region_name(int region_index) { 1536 static const char* names[] = { 1537 "rw", "ro", "bm", "hp", "cc", 1538 }; 1539 const int num_regions = sizeof(names)/sizeof(names[0]); 1540 assert(0 <= region_index && region_index < num_regions, "sanity"); 1541 1542 return names[region_index]; 1543 } 1544 1545 BitMapView FileMapInfo::bitmap_view(int region_index, bool is_oopmap) { 1546 FileMapRegion* r = region_at(region_index); 1547 char* bitmap_base = is_static() ? FileMapInfo::current_info()->map_bitmap_region() : FileMapInfo::dynamic_info()->map_bitmap_region(); 1548 bitmap_base += is_oopmap ? r->oopmap_offset() : r->ptrmap_offset(); 1549 size_t size_in_bits = is_oopmap ? r->oopmap_size_in_bits() : r->ptrmap_size_in_bits(); 1550 1551 log_debug(cds, reloc)("mapped %s relocation %smap @ " INTPTR_FORMAT " (" SIZE_FORMAT " bits)", 1552 region_name(region_index), is_oopmap ? "oop" : "ptr", 1553 p2i(bitmap_base), size_in_bits); 1554 1555 return BitMapView((BitMap::bm_word_t*)(bitmap_base), size_in_bits); 1556 } 1557 1558 BitMapView FileMapInfo::oopmap_view(int region_index) { 1559 return bitmap_view(region_index, /*is_oopmap*/true); 1560 } 1561 1562 BitMapView FileMapInfo::ptrmap_view(int region_index) { 1563 return bitmap_view(region_index, /*is_oopmap*/false); 1564 } 1565 1566 void FileMapRegion::print(outputStream* st, int region_index) { 1567 st->print_cr("============ region ============= %d \"%s\"", region_index, region_name(region_index)); 1568 st->print_cr("- crc: 0x%08x", _crc); 1569 st->print_cr("- read_only: %d", _read_only); 1570 st->print_cr("- allow_exec: %d", _allow_exec); 1571 st->print_cr("- is_heap_region: %d", _is_heap_region); 1572 st->print_cr("- is_bitmap_region: %d", _is_bitmap_region); 1573 st->print_cr("- mapped_from_file: %d", _mapped_from_file); 1574 st->print_cr("- file_offset: " SIZE_FORMAT_X, _file_offset); 1575 st->print_cr("- mapping_offset: " SIZE_FORMAT_X, _mapping_offset); 1576 st->print_cr("- used: " SIZE_FORMAT, _used); 1577 st->print_cr("- oopmap_offset: " SIZE_FORMAT_X, _oopmap_offset); 1578 st->print_cr("- oopmap_size_in_bits: " SIZE_FORMAT, _oopmap_size_in_bits); 1579 st->print_cr("- ptrmap_offset: " SIZE_FORMAT_X, _ptrmap_offset); 1580 st->print_cr("- ptrmap_size_in_bits: " SIZE_FORMAT, _ptrmap_size_in_bits); 1581 st->print_cr("- mapped_base: " INTPTR_FORMAT, p2i(_mapped_base)); 1582 } 1583 1584 void FileMapInfo::write_region(int region, char* base, size_t size, 1585 bool read_only, bool allow_exec) { 1586 assert(CDSConfig::is_dumping_archive(), "sanity"); 1587 1588 FileMapRegion* r = region_at(region); 1589 char* requested_base; 1590 size_t mapping_offset = 0; 1591 1592 if (region == MetaspaceShared::bm) { 1593 requested_base = nullptr; // always null for bm region 1594 } else if (size == 0) { 1595 // This is an unused region (e.g., a heap region when !INCLUDE_CDS_JAVA_HEAP) 1596 requested_base = nullptr; 1597 } else if (HeapShared::is_heap_region(region)) { 1598 assert(HeapShared::can_write(), "sanity"); 1599 #if INCLUDE_CDS_JAVA_HEAP 1600 assert(!CDSConfig::is_dumping_dynamic_archive(), "must be"); 1601 requested_base = (char*)ArchiveHeapWriter::requested_address(); 1602 if (UseCompressedOops) { 1603 mapping_offset = (size_t)((address)requested_base - CompressedOops::base()); 1604 assert((mapping_offset >> CompressedOops::shift()) << CompressedOops::shift() == mapping_offset, "must be"); 1605 } else { 1606 mapping_offset = 0; // not used with !UseCompressedOops 1607 } 1608 #endif // INCLUDE_CDS_JAVA_HEAP 1609 } else { 1610 char* requested_SharedBaseAddress = (char*)MetaspaceShared::requested_base_address(); 1611 requested_base = ArchiveBuilder::current()->to_requested(base); 1612 assert(requested_base >= requested_SharedBaseAddress, "must be"); 1613 mapping_offset = requested_base - requested_SharedBaseAddress; 1614 } 1615 1616 r->set_file_offset(_file_offset); 1617 int crc = ClassLoader::crc32(0, base, (jint)size); 1618 if (size > 0) { 1619 log_info(cds)("Shared file region (%s) %d: " SIZE_FORMAT_W(8) 1620 " bytes, addr " INTPTR_FORMAT " file offset 0x%08" PRIxPTR 1621 " crc 0x%08x", 1622 region_name(region), region, size, p2i(requested_base), _file_offset, crc); 1623 } else { 1624 log_info(cds)("Shared file region (%s) %d: " SIZE_FORMAT_W(8) 1625 " bytes", region_name(region), region, size); 1626 } 1627 1628 r->init(region, mapping_offset, size, read_only, allow_exec, crc); 1629 1630 if (base != nullptr) { 1631 write_bytes_aligned(base, size); 1632 } 1633 } 1634 1635 static size_t write_bitmap(const CHeapBitMap* map, char* output, size_t offset) { 1636 size_t size_in_bytes = map->size_in_bytes(); 1637 map->write_to((BitMap::bm_word_t*)(output + offset), size_in_bytes); 1638 return offset + size_in_bytes; 1639 } 1640 1641 // The sorting code groups the objects with non-null oop/ptrs together. 1642 // Relevant bitmaps then have lots of leading and trailing zeros, which 1643 // we do not have to store. 1644 size_t FileMapInfo::remove_bitmap_zeros(CHeapBitMap* map) { 1645 BitMap::idx_t first_set = map->find_first_set_bit(0); 1646 BitMap::idx_t last_set = map->find_last_set_bit(0); 1647 size_t old_size = map->size(); 1648 1649 // Slice and resize bitmap 1650 map->truncate(first_set, last_set + 1); 1651 1652 assert(map->at(0), "First bit should be set"); 1653 assert(map->at(map->size() - 1), "Last bit should be set"); 1654 assert(map->size() <= old_size, "sanity"); 1655 1656 return first_set; 1657 } 1658 1659 char* FileMapInfo::write_bitmap_region(CHeapBitMap* rw_ptrmap, CHeapBitMap* ro_ptrmap, 1660 CHeapBitMap* cc_ptrmap, 1661 ArchiveHeapInfo* heap_info, 1662 size_t &size_in_bytes) { 1663 size_t removed_rw_leading_zeros = remove_bitmap_zeros(rw_ptrmap); 1664 size_t removed_ro_leading_zeros = remove_bitmap_zeros(ro_ptrmap); 1665 header()->set_rw_ptrmap_start_pos(removed_rw_leading_zeros); 1666 header()->set_ro_ptrmap_start_pos(removed_ro_leading_zeros); 1667 size_in_bytes = rw_ptrmap->size_in_bytes() + ro_ptrmap->size_in_bytes() + cc_ptrmap->size_in_bytes(); 1668 1669 if (heap_info->is_used()) { 1670 // Remove leading and trailing zeros 1671 size_t removed_oop_leading_zeros = remove_bitmap_zeros(heap_info->oopmap()); 1672 size_t removed_ptr_leading_zeros = remove_bitmap_zeros(heap_info->ptrmap()); 1673 header()->set_heap_oopmap_start_pos(removed_oop_leading_zeros); 1674 header()->set_heap_ptrmap_start_pos(removed_ptr_leading_zeros); 1675 1676 size_in_bytes += heap_info->oopmap()->size_in_bytes(); 1677 size_in_bytes += heap_info->ptrmap()->size_in_bytes(); 1678 } 1679 1680 // The bitmap region contains up to 4 parts: 1681 // rw_ptrmap: metaspace pointers inside the read-write region 1682 // ro_ptrmap: metaspace pointers inside the read-only region 1683 // heap_info->oopmap(): Java oop pointers in the heap region 1684 // heap_info->ptrmap(): metaspace pointers in the heap region 1685 char* buffer = NEW_C_HEAP_ARRAY(char, size_in_bytes, mtClassShared); 1686 size_t written = 0; 1687 1688 region_at(MetaspaceShared::rw)->init_ptrmap(0, rw_ptrmap->size()); 1689 written = write_bitmap(rw_ptrmap, buffer, written); 1690 1691 region_at(MetaspaceShared::ro)->init_ptrmap(written, ro_ptrmap->size()); 1692 written = write_bitmap(ro_ptrmap, buffer, written); 1693 1694 region_at(MetaspaceShared::cc)->init_ptrmap(written, cc_ptrmap->size()); 1695 written = write_bitmap(cc_ptrmap, buffer, written); 1696 1697 if (heap_info->is_used()) { 1698 FileMapRegion* r = region_at(MetaspaceShared::hp); 1699 1700 r->init_oopmap(written, heap_info->oopmap()->size()); 1701 written = write_bitmap(heap_info->oopmap(), buffer, written); 1702 1703 r->init_ptrmap(written, heap_info->ptrmap()->size()); 1704 written = write_bitmap(heap_info->ptrmap(), buffer, written); 1705 } 1706 1707 write_region(MetaspaceShared::bm, (char*)buffer, size_in_bytes, /*read_only=*/true, /*allow_exec=*/false); 1708 return buffer; 1709 } 1710 1711 size_t FileMapInfo::write_heap_region(ArchiveHeapInfo* heap_info) { 1712 char* buffer_start = heap_info->buffer_start(); 1713 size_t buffer_size = heap_info->buffer_byte_size(); 1714 write_region(MetaspaceShared::hp, buffer_start, buffer_size, false, false); 1715 header()->set_heap_root_segments(heap_info->heap_root_segments()); 1716 return buffer_size; 1717 } 1718 1719 // Dump bytes to file -- at the current file position. 1720 1721 void FileMapInfo::write_bytes(const void* buffer, size_t nbytes) { 1722 assert(_file_open, "must be"); 1723 if (!os::write(_fd, buffer, nbytes)) { 1724 // If the shared archive is corrupted, close it and remove it. 1725 close(); 1726 remove(_full_path); 1727 MetaspaceShared::writing_error("Unable to write to shared archive file."); 1728 } 1729 _file_offset += nbytes; 1730 } 1731 1732 bool FileMapInfo::is_file_position_aligned() const { 1733 return _file_offset == align_up(_file_offset, 1734 MetaspaceShared::core_region_alignment()); 1735 } 1736 1737 // Align file position to an allocation unit boundary. 1738 1739 void FileMapInfo::align_file_position() { 1740 assert(_file_open, "must be"); 1741 size_t new_file_offset = align_up(_file_offset, 1742 MetaspaceShared::core_region_alignment()); 1743 if (new_file_offset != _file_offset) { 1744 _file_offset = new_file_offset; 1745 // Seek one byte back from the target and write a byte to insure 1746 // that the written file is the correct length. 1747 _file_offset -= 1; 1748 seek_to_position(_file_offset); 1749 char zero = 0; 1750 write_bytes(&zero, 1); 1751 } 1752 } 1753 1754 1755 // Dump bytes to file -- at the current file position. 1756 1757 void FileMapInfo::write_bytes_aligned(const void* buffer, size_t nbytes) { 1758 align_file_position(); 1759 write_bytes(buffer, nbytes); 1760 align_file_position(); 1761 } 1762 1763 // Close the shared archive file. This does NOT unmap mapped regions. 1764 1765 void FileMapInfo::close() { 1766 if (_file_open) { 1767 if (::close(_fd) < 0) { 1768 MetaspaceShared::unrecoverable_loading_error("Unable to close the shared archive file."); 1769 } 1770 _file_open = false; 1771 _fd = -1; 1772 } 1773 } 1774 1775 /* 1776 * Same as os::map_memory() but also pretouches if AlwaysPreTouch is enabled. 1777 */ 1778 static char* map_memory(int fd, const char* file_name, size_t file_offset, 1779 char *addr, size_t bytes, bool read_only, 1780 bool allow_exec, MemTag mem_tag = mtNone) { 1781 char* mem = os::map_memory(fd, file_name, file_offset, addr, bytes, 1782 AlwaysPreTouch ? false : read_only, 1783 allow_exec, mem_tag); 1784 if (mem != nullptr && AlwaysPreTouch) { 1785 os::pretouch_memory(mem, mem + bytes); 1786 } 1787 return mem; 1788 } 1789 1790 // JVM/TI RedefineClasses() support: 1791 // Remap the shared readonly space to shared readwrite, private. 1792 bool FileMapInfo::remap_shared_readonly_as_readwrite() { 1793 int idx = MetaspaceShared::ro; 1794 FileMapRegion* r = region_at(idx); 1795 if (!r->read_only()) { 1796 // the space is already readwrite so we are done 1797 return true; 1798 } 1799 size_t size = r->used_aligned(); 1800 if (!open_for_read()) { 1801 return false; 1802 } 1803 char *addr = r->mapped_base(); 1804 // This path should not be reached for Windows; see JDK-8222379. 1805 assert(WINDOWS_ONLY(false) NOT_WINDOWS(true), "Don't call on Windows"); 1806 // Replace old mapping with new one that is writable. 1807 char *base = os::map_memory(_fd, _full_path, r->file_offset(), 1808 addr, size, false /* !read_only */, 1809 r->allow_exec()); 1810 close(); 1811 // These have to be errors because the shared region is now unmapped. 1812 if (base == nullptr) { 1813 log_error(cds)("Unable to remap shared readonly space (errno=%d).", errno); 1814 vm_exit(1); 1815 } 1816 if (base != addr) { 1817 log_error(cds)("Unable to remap shared readonly space (errno=%d).", errno); 1818 vm_exit(1); 1819 } 1820 r->set_read_only(false); 1821 return true; 1822 } 1823 1824 // Memory map a region in the address space. 1825 static const char* shared_region_name[] = { "ReadWrite", "ReadOnly", "Bitmap", "Heap", "Code" }; 1826 1827 MapArchiveResult FileMapInfo::map_regions(int regions[], int num_regions, char* mapped_base_address, ReservedSpace rs) { 1828 DEBUG_ONLY(FileMapRegion* last_region = nullptr); 1829 intx addr_delta = mapped_base_address - header()->requested_base_address(); 1830 1831 // Make sure we don't attempt to use header()->mapped_base_address() unless 1832 // it's been successfully mapped. 1833 DEBUG_ONLY(header()->set_mapped_base_address((char*)(uintptr_t)0xdeadbeef);) 1834 1835 for (int i = 0; i < num_regions; i++) { 1836 int idx = regions[i]; 1837 MapArchiveResult result = map_region(idx, addr_delta, mapped_base_address, rs); 1838 if (result != MAP_ARCHIVE_SUCCESS) { 1839 return result; 1840 } 1841 FileMapRegion* r = region_at(idx); 1842 DEBUG_ONLY(if (last_region != nullptr) { 1843 // Ensure that the OS won't be able to allocate new memory spaces between any mapped 1844 // regions, or else it would mess up the simple comparison in MetaspaceObj::is_shared(). 1845 assert(r->mapped_base() == last_region->mapped_end(), "must have no gaps"); 1846 } 1847 last_region = r;) 1848 log_info(cds)("Mapped %s region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)", is_static() ? "static " : "dynamic", 1849 idx, p2i(r->mapped_base()), p2i(r->mapped_end()), 1850 shared_region_name[idx]); 1851 1852 } 1853 1854 header()->set_mapped_base_address(header()->requested_base_address() + addr_delta); 1855 if (addr_delta != 0 && !relocate_pointers_in_core_regions(addr_delta)) { 1856 return MAP_ARCHIVE_OTHER_FAILURE; 1857 } 1858 1859 return MAP_ARCHIVE_SUCCESS; 1860 } 1861 1862 bool FileMapInfo::read_region(int i, char* base, size_t size, bool do_commit) { 1863 FileMapRegion* r = region_at(i); 1864 if (do_commit) { 1865 log_info(cds)("Commit %s region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)%s", 1866 is_static() ? "static " : "dynamic", i, p2i(base), p2i(base + size), 1867 shared_region_name[i], r->allow_exec() ? " exec" : ""); 1868 if (!os::commit_memory(base, size, r->allow_exec())) { 1869 log_error(cds)("Failed to commit %s region #%d (%s)", is_static() ? "static " : "dynamic", 1870 i, shared_region_name[i]); 1871 return false; 1872 } 1873 } 1874 if (os::lseek(_fd, (long)r->file_offset(), SEEK_SET) != (int)r->file_offset() || 1875 read_bytes(base, size) != size) { 1876 return false; 1877 } 1878 1879 if (VerifySharedSpaces && !r->check_region_crc(base)) { 1880 return false; 1881 } 1882 1883 r->set_mapped_from_file(false); 1884 r->set_mapped_base(base); 1885 1886 return true; 1887 } 1888 1889 MapArchiveResult FileMapInfo::map_region(int i, intx addr_delta, char* mapped_base_address, ReservedSpace rs) { 1890 assert(!HeapShared::is_heap_region(i), "sanity"); 1891 FileMapRegion* r = region_at(i); 1892 size_t size = r->used_aligned(); 1893 char *requested_addr = mapped_base_address + r->mapping_offset(); 1894 assert(r->mapped_base() == nullptr, "must be not mapped yet"); 1895 assert(requested_addr != nullptr, "must be specified"); 1896 1897 r->set_mapped_from_file(false); 1898 1899 if (MetaspaceShared::use_windows_memory_mapping()) { 1900 // Windows cannot remap read-only shared memory to read-write when required for 1901 // RedefineClasses, which is also used by JFR. Always map windows regions as RW. 1902 r->set_read_only(false); 1903 } else if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space() || 1904 Arguments::has_jfr_option()) { 1905 // If a tool agent is in use (debugging enabled), or JFR, we must map the address space RW 1906 r->set_read_only(false); 1907 } else if (addr_delta != 0) { 1908 r->set_read_only(false); // Need to patch the pointers 1909 } 1910 1911 if (MetaspaceShared::use_windows_memory_mapping() && rs.is_reserved()) { 1912 // This is the second time we try to map the archive(s). We have already created a ReservedSpace 1913 // that covers all the FileMapRegions to ensure all regions can be mapped. However, Windows 1914 // can't mmap into a ReservedSpace, so we just ::read() the data. We're going to patch all the 1915 // regions anyway, so there's no benefit for mmap anyway. 1916 if (!read_region(i, requested_addr, size, /* do_commit = */ true)) { 1917 log_info(cds)("Failed to read %s shared space into reserved space at " INTPTR_FORMAT, 1918 shared_region_name[i], p2i(requested_addr)); 1919 return MAP_ARCHIVE_OTHER_FAILURE; // oom or I/O error. 1920 } else { 1921 assert(r->mapped_base() != nullptr, "must be initialized"); 1922 return MAP_ARCHIVE_SUCCESS; 1923 } 1924 } else { 1925 // Note that this may either be a "fresh" mapping into unreserved address 1926 // space (Windows, first mapping attempt), or a mapping into pre-reserved 1927 // space (Posix). See also comment in MetaspaceShared::map_archives(). 1928 bool read_only = r->read_only() && !CDSConfig::is_dumping_final_static_archive(); 1929 char* base = map_memory(_fd, _full_path, r->file_offset(), 1930 requested_addr, size, read_only, 1931 r->allow_exec(), mtClassShared); 1932 if (base != requested_addr) { 1933 log_info(cds)("Unable to map %s shared space at " INTPTR_FORMAT, 1934 shared_region_name[i], p2i(requested_addr)); 1935 _memory_mapping_failed = true; 1936 return MAP_ARCHIVE_MMAP_FAILURE; 1937 } 1938 1939 if (VerifySharedSpaces && !r->check_region_crc(requested_addr)) { 1940 return MAP_ARCHIVE_OTHER_FAILURE; 1941 } 1942 1943 r->set_mapped_from_file(true); 1944 r->set_mapped_base(requested_addr); 1945 1946 return MAP_ARCHIVE_SUCCESS; 1947 } 1948 } 1949 1950 // The return value is the location of the archive relocation bitmap. 1951 char* FileMapInfo::map_bitmap_region() { 1952 FileMapRegion* r = region_at(MetaspaceShared::bm); 1953 if (r->mapped_base() != nullptr) { 1954 return r->mapped_base(); 1955 } 1956 bool read_only = true, allow_exec = false; 1957 char* requested_addr = nullptr; // allow OS to pick any location 1958 char* bitmap_base = map_memory(_fd, _full_path, r->file_offset(), 1959 requested_addr, r->used_aligned(), read_only, allow_exec, mtClassShared); 1960 if (bitmap_base == nullptr) { 1961 log_info(cds)("failed to map relocation bitmap"); 1962 return nullptr; 1963 } 1964 1965 if (VerifySharedSpaces && !r->check_region_crc(bitmap_base)) { 1966 log_error(cds)("relocation bitmap CRC error"); 1967 if (!os::unmap_memory(bitmap_base, r->used_aligned())) { 1968 fatal("os::unmap_memory of relocation bitmap failed"); 1969 } 1970 return nullptr; 1971 } 1972 1973 r->set_mapped_from_file(true); 1974 r->set_mapped_base(bitmap_base); 1975 log_info(cds)("Mapped %s region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)", 1976 is_static() ? "static " : "dynamic", 1977 MetaspaceShared::bm, p2i(r->mapped_base()), p2i(r->mapped_end()), 1978 shared_region_name[MetaspaceShared::bm]); 1979 return bitmap_base; 1980 } 1981 1982 bool FileMapInfo::map_cached_code_region(ReservedSpace rs) { 1983 FileMapRegion* r = region_at(MetaspaceShared::cc); 1984 assert(r->used() > 0 && rs.size(), "must be"); 1985 1986 bool read_only = false, allow_exec = true; 1987 char* requested_base = rs.base(); 1988 char* mapped_base = map_memory(_fd, _full_path, r->file_offset(), 1989 requested_base, r->used_aligned(), read_only, allow_exec, mtClassShared); 1990 if (mapped_base == nullptr) { 1991 log_info(cds)("failed to map cached code region"); 1992 return false; 1993 } else { 1994 assert(mapped_base == requested_base, "must be"); 1995 r->set_mapped_from_file(true); 1996 r->set_mapped_base(mapped_base); 1997 relocate_pointers_in_cached_code_region(); 1998 log_info(cds)("Mapped static region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)", 1999 MetaspaceShared::bm, p2i(r->mapped_base()), p2i(r->mapped_end()), 2000 shared_region_name[MetaspaceShared::cc]); 2001 return true; 2002 } 2003 } 2004 2005 class CachedCodeRelocator: public BitMapClosure { 2006 address _code_requested_base; 2007 address* _patch_base; 2008 intx _code_delta; 2009 intx _metadata_delta; 2010 2011 public: 2012 CachedCodeRelocator(address code_requested_base, address code_mapped_base, 2013 intx metadata_delta) { 2014 _code_requested_base = code_requested_base; 2015 _patch_base = (address*)code_mapped_base; 2016 _code_delta = code_mapped_base - code_requested_base; 2017 _metadata_delta = metadata_delta; 2018 } 2019 2020 bool do_bit(size_t offset) { 2021 address* p = _patch_base + offset; 2022 address requested_ptr = *p; 2023 if (requested_ptr < _code_requested_base) { 2024 *p = requested_ptr + _metadata_delta; 2025 } else { 2026 *p = requested_ptr + _code_delta; 2027 } 2028 return true; // keep iterating 2029 } 2030 }; 2031 2032 void FileMapInfo::relocate_pointers_in_cached_code_region() { 2033 FileMapRegion* r = region_at(MetaspaceShared::cc); 2034 char* bitmap_base = map_bitmap_region(); 2035 2036 BitMapView cc_ptrmap = ptrmap_view(MetaspaceShared::cc); 2037 if (cc_ptrmap.size() == 0) { 2038 return; 2039 } 2040 2041 address core_regions_requested_base = (address)header()->requested_base_address(); 2042 address core_regions_mapped_base = (address)header()->mapped_base_address(); 2043 address cc_region_requested_base = core_regions_requested_base + r->mapping_offset(); 2044 address cc_region_mapped_base = (address)r->mapped_base(); 2045 2046 size_t max_bits_for_core_regions = pointer_delta(mapped_end(), mapped_base(), // FIXME - renamed to core_regions_mapped_base(), etc 2047 sizeof(address)); 2048 2049 CachedCodeRelocator patcher(cc_region_requested_base, cc_region_mapped_base, 2050 core_regions_mapped_base - core_regions_requested_base); 2051 cc_ptrmap.iterate(&patcher); 2052 } 2053 2054 // This is called when we cannot map the archive at the requested[ base address (usually 0x800000000). 2055 // We relocate all pointers in the 2 core regions (ro, rw). 2056 bool FileMapInfo::relocate_pointers_in_core_regions(intx addr_delta) { 2057 log_debug(cds, reloc)("runtime archive relocation start"); 2058 char* bitmap_base = map_bitmap_region(); 2059 2060 if (bitmap_base == nullptr) { 2061 return false; // OOM, or CRC check failure 2062 } else { 2063 BitMapView rw_ptrmap = ptrmap_view(MetaspaceShared::rw); 2064 BitMapView ro_ptrmap = ptrmap_view(MetaspaceShared::ro); 2065 2066 FileMapRegion* rw_region = first_core_region(); 2067 FileMapRegion* ro_region = last_core_region(); 2068 2069 // Patch all pointers inside the RW region 2070 address rw_patch_base = (address)rw_region->mapped_base(); 2071 address rw_patch_end = (address)rw_region->mapped_end(); 2072 2073 // Patch all pointers inside the RO region 2074 address ro_patch_base = (address)ro_region->mapped_base(); 2075 address ro_patch_end = (address)ro_region->mapped_end(); 2076 2077 // the current value of the pointers to be patched must be within this 2078 // range (i.e., must be between the requested base address and the address of the current archive). 2079 // Note: top archive may point to objects in the base archive, but not the other way around. 2080 address valid_old_base = (address)header()->requested_base_address(); 2081 address valid_old_end = valid_old_base + mapping_end_offset(); 2082 2083 // after patching, the pointers must point inside this range 2084 // (the requested location of the archive, as mapped at runtime). 2085 address valid_new_base = (address)header()->mapped_base_address(); 2086 address valid_new_end = (address)mapped_end(); 2087 2088 SharedDataRelocator rw_patcher((address*)rw_patch_base + header()->rw_ptrmap_start_pos(), (address*)rw_patch_end, valid_old_base, valid_old_end, 2089 valid_new_base, valid_new_end, addr_delta); 2090 SharedDataRelocator ro_patcher((address*)ro_patch_base + header()->ro_ptrmap_start_pos(), (address*)ro_patch_end, valid_old_base, valid_old_end, 2091 valid_new_base, valid_new_end, addr_delta); 2092 rw_ptrmap.iterate(&rw_patcher); 2093 ro_ptrmap.iterate(&ro_patcher); 2094 2095 // The MetaspaceShared::bm region will be unmapped in MetaspaceShared::initialize_shared_spaces(). 2096 2097 log_debug(cds, reloc)("runtime archive relocation done"); 2098 return true; 2099 } 2100 } 2101 2102 size_t FileMapInfo::read_bytes(void* buffer, size_t count) { 2103 assert(_file_open, "Archive file is not open"); 2104 size_t n = ::read(_fd, buffer, (unsigned int)count); 2105 if (n != count) { 2106 // Close the file if there's a problem reading it. 2107 close(); 2108 return 0; 2109 } 2110 _file_offset += count; 2111 return count; 2112 } 2113 2114 // Get the total size in bytes of a read only region 2115 size_t FileMapInfo::readonly_total() { 2116 size_t total = 0; 2117 if (current_info() != nullptr) { 2118 FileMapRegion* r = FileMapInfo::current_info()->region_at(MetaspaceShared::ro); 2119 if (r->read_only()) total += r->used(); 2120 } 2121 if (dynamic_info() != nullptr) { 2122 FileMapRegion* r = FileMapInfo::dynamic_info()->region_at(MetaspaceShared::ro); 2123 if (r->read_only()) total += r->used(); 2124 } 2125 return total; 2126 } 2127 2128 #if INCLUDE_CDS_JAVA_HEAP 2129 MemRegion FileMapInfo::_mapped_heap_memregion; 2130 2131 bool FileMapInfo::has_heap_region() { 2132 return (region_at(MetaspaceShared::hp)->used() > 0); 2133 } 2134 2135 // Returns the address range of the archived heap region computed using the 2136 // current oop encoding mode. This range may be different than the one seen at 2137 // dump time due to encoding mode differences. The result is used in determining 2138 // if/how these regions should be relocated at run time. 2139 MemRegion FileMapInfo::get_heap_region_requested_range() { 2140 FileMapRegion* r = region_at(MetaspaceShared::hp); 2141 size_t size = r->used(); 2142 assert(size > 0, "must have non-empty heap region"); 2143 2144 address start = heap_region_requested_address(); 2145 address end = start + size; 2146 log_info(cds)("Requested heap region [" INTPTR_FORMAT " - " INTPTR_FORMAT "] = " SIZE_FORMAT_W(8) " bytes", 2147 p2i(start), p2i(end), size); 2148 2149 return MemRegion((HeapWord*)start, (HeapWord*)end); 2150 } 2151 2152 void FileMapInfo::map_or_load_heap_region() { 2153 bool success = false; 2154 2155 if (can_use_heap_region()) { 2156 if (ArchiveHeapLoader::can_map()) { 2157 success = map_heap_region(); 2158 } else if (ArchiveHeapLoader::can_load()) { 2159 success = ArchiveHeapLoader::load_heap_region(this); 2160 } else { 2161 if (!UseCompressedOops && !ArchiveHeapLoader::can_map()) { 2162 // TODO - remove implicit knowledge of G1 2163 log_info(cds)("Cannot use CDS heap data. UseG1GC is required for -XX:-UseCompressedOops"); 2164 } else { 2165 log_info(cds)("Cannot use CDS heap data. UseEpsilonGC, UseG1GC, UseSerialGC, UseParallelGC, or UseShenandoahGC are required."); 2166 } 2167 } 2168 } 2169 2170 if (!success) { 2171 if (CDSConfig::is_using_aot_linked_classes() && !CDSConfig::is_dumping_final_static_archive()) { 2172 // It's too later to recover -- we have already committed to use the archived metaspace objects, but 2173 // the archived heap objects cannot be loaded, so we don't have the archived FMG to guarantee that 2174 // all AOT-linked classes are visible. 2175 // 2176 // We get here because the heap is too small. The app will fail anyway. So let's quit. 2177 MetaspaceShared::unrecoverable_loading_error("CDS archive has aot-linked classes but the archived " 2178 "heap objects cannot be loaded. Try increasing your heap size."); 2179 } 2180 CDSConfig::stop_using_full_module_graph("archive heap loading failed"); 2181 } 2182 } 2183 2184 bool FileMapInfo::can_use_heap_region() { 2185 if (!has_heap_region()) { 2186 return false; 2187 } 2188 if (JvmtiExport::should_post_class_file_load_hook() && JvmtiExport::has_early_class_hook_env()) { 2189 ShouldNotReachHere(); // CDS should have been disabled. 2190 // The archived objects are mapped at JVM start-up, but we don't know if 2191 // j.l.String or j.l.Class might be replaced by the ClassFileLoadHook, 2192 // which would make the archived String or mirror objects invalid. Let's be safe and not 2193 // use the archived objects. These 2 classes are loaded during the JVMTI "early" stage. 2194 // 2195 // If JvmtiExport::has_early_class_hook_env() is false, the classes of some objects 2196 // in the archived subgraphs may be replaced by the ClassFileLoadHook. But that's OK 2197 // because we won't install an archived object subgraph if the klass of any of the 2198 // referenced objects are replaced. See HeapShared::initialize_from_archived_subgraph(). 2199 } 2200 2201 // We pre-compute narrow Klass IDs with the runtime mapping start intended to be the base, and a shift of 2202 // ArchiveHeapWriter::precomputed_narrow_klass_shift. We enforce this encoding at runtime (see 2203 // CompressedKlassPointers::initialize_for_given_encoding()). Therefore, the following assertions must 2204 // hold: 2205 address archive_narrow_klass_base = (address)header()->mapped_base_address(); 2206 const int archive_narrow_klass_shift = ArchiveHeapWriter::precomputed_narrow_klass_shift; 2207 2208 log_info(cds)("CDS archive was created with max heap size = " SIZE_FORMAT "M, and the following configuration:", 2209 max_heap_size()/M); 2210 log_info(cds)(" narrow_klass_base at mapping start address, narrow_klass_shift = %d", 2211 archive_narrow_klass_shift); 2212 log_info(cds)(" narrow_oop_mode = %d, narrow_oop_base = " PTR_FORMAT ", narrow_oop_shift = %d", 2213 narrow_oop_mode(), p2i(narrow_oop_base()), narrow_oop_shift()); 2214 log_info(cds)("The current max heap size = " SIZE_FORMAT "M, G1HeapRegion::GrainBytes = " SIZE_FORMAT, 2215 MaxHeapSize/M, G1HeapRegion::GrainBytes); 2216 log_info(cds)(" narrow_klass_base = " PTR_FORMAT ", narrow_klass_shift = %d", 2217 p2i(CompressedKlassPointers::base()), CompressedKlassPointers::shift()); 2218 log_info(cds)(" narrow_oop_mode = %d, narrow_oop_base = " PTR_FORMAT ", narrow_oop_shift = %d", 2219 CompressedOops::mode(), p2i(CompressedOops::base()), CompressedOops::shift()); 2220 log_info(cds)(" heap range = [" PTR_FORMAT " - " PTR_FORMAT "]", 2221 UseCompressedOops ? p2i(CompressedOops::begin()) : 2222 UseG1GC ? p2i((address)G1CollectedHeap::heap()->reserved().start()) : 0L, 2223 UseCompressedOops ? p2i(CompressedOops::end()) : 2224 UseG1GC ? p2i((address)G1CollectedHeap::heap()->reserved().end()) : 0L); 2225 2226 assert(archive_narrow_klass_base == CompressedKlassPointers::base(), "Unexpected encoding base encountered " 2227 "(" PTR_FORMAT ", expected " PTR_FORMAT ")", p2i(CompressedKlassPointers::base()), p2i(archive_narrow_klass_base)); 2228 assert(archive_narrow_klass_shift == CompressedKlassPointers::shift(), "Unexpected encoding shift encountered " 2229 "(%d, expected %d)", CompressedKlassPointers::shift(), archive_narrow_klass_shift); 2230 2231 return true; 2232 } 2233 2234 // The actual address of this region during dump time. 2235 address FileMapInfo::heap_region_dumptime_address() { 2236 FileMapRegion* r = region_at(MetaspaceShared::hp); 2237 assert(CDSConfig::is_using_archive(), "runtime only"); 2238 assert(is_aligned(r->mapping_offset(), sizeof(HeapWord)), "must be"); 2239 if (UseCompressedOops) { 2240 return /*dumptime*/ narrow_oop_base() + r->mapping_offset(); 2241 } else { 2242 return heap_region_requested_address(); 2243 } 2244 } 2245 2246 // The address where this region can be mapped into the runtime heap without 2247 // patching any of the pointers that are embedded in this region. 2248 address FileMapInfo::heap_region_requested_address() { 2249 assert(CDSConfig::is_using_archive(), "runtime only"); 2250 FileMapRegion* r = region_at(MetaspaceShared::hp); 2251 assert(is_aligned(r->mapping_offset(), sizeof(HeapWord)), "must be"); 2252 assert(ArchiveHeapLoader::can_map(), "cannot be used by ArchiveHeapLoader::can_load() mode"); 2253 if (UseCompressedOops) { 2254 // We can avoid relocation if each region's offset from the runtime CompressedOops::base() 2255 // is the same as its offset from the CompressedOops::base() during dumptime. 2256 // Note that CompressedOops::base() may be different between dumptime and runtime. 2257 // 2258 // Example: 2259 // Dumptime base = 0x1000 and shift is 0. We have a region at address 0x2000. There's a 2260 // narrowOop P stored in this region that points to an object at address 0x2200. 2261 // P's encoded value is 0x1200. 2262 // 2263 // Runtime base = 0x4000 and shift is also 0. If we map this region at 0x5000, then 2264 // the value P can remain 0x1200. The decoded address = (0x4000 + (0x1200 << 0)) = 0x5200, 2265 // which is the runtime location of the referenced object. 2266 return /*runtime*/ CompressedOops::base() + r->mapping_offset(); 2267 } else { 2268 // This was the hard-coded requested base address used at dump time. With uncompressed oops, 2269 // the heap range is assigned by the OS so we will most likely have to relocate anyway, no matter 2270 // what base address was picked at duump time. 2271 return (address)ArchiveHeapWriter::NOCOOPS_REQUESTED_BASE; 2272 } 2273 } 2274 2275 bool FileMapInfo::map_heap_region() { 2276 if (map_heap_region_impl()) { 2277 #ifdef ASSERT 2278 // The "old" regions must be parsable -- we cannot have any unused space 2279 // at the start of the lowest G1 region that contains archived objects. 2280 assert(is_aligned(_mapped_heap_memregion.start(), G1HeapRegion::GrainBytes), "must be"); 2281 2282 // Make sure we map at the very top of the heap - see comments in 2283 // init_heap_region_relocation(). 2284 MemRegion heap_range = G1CollectedHeap::heap()->reserved(); 2285 assert(heap_range.contains(_mapped_heap_memregion), "must be"); 2286 2287 address heap_end = (address)heap_range.end(); 2288 address mapped_heap_region_end = (address)_mapped_heap_memregion.end(); 2289 assert(heap_end >= mapped_heap_region_end, "must be"); 2290 assert(heap_end - mapped_heap_region_end < (intx)(G1HeapRegion::GrainBytes), 2291 "must be at the top of the heap to avoid fragmentation"); 2292 #endif 2293 2294 ArchiveHeapLoader::set_mapped(); 2295 return true; 2296 } else { 2297 return false; 2298 } 2299 } 2300 2301 bool FileMapInfo::map_heap_region_impl() { 2302 assert(UseG1GC, "the following code assumes G1"); 2303 2304 FileMapRegion* r = region_at(MetaspaceShared::hp); 2305 size_t size = r->used(); 2306 if (size == 0) { 2307 return false; // no archived java heap data 2308 } 2309 2310 size_t word_size = size / HeapWordSize; 2311 address requested_start = heap_region_requested_address(); 2312 2313 log_info(cds)("Preferred address to map heap data (to avoid relocation) is " INTPTR_FORMAT, p2i(requested_start)); 2314 2315 // allocate from java heap 2316 HeapWord* start = G1CollectedHeap::heap()->alloc_archive_region(word_size, (HeapWord*)requested_start); 2317 if (start == nullptr) { 2318 log_info(cds)("UseSharedSpaces: Unable to allocate java heap region for archive heap."); 2319 return false; 2320 } 2321 2322 _mapped_heap_memregion = MemRegion(start, word_size); 2323 2324 // Map the archived heap data. No need to call MemTracker::record_virtual_memory_tag() 2325 // for mapped region as it is part of the reserved java heap, which is already recorded. 2326 char* addr = (char*)_mapped_heap_memregion.start(); 2327 char* base; 2328 2329 if (MetaspaceShared::use_windows_memory_mapping()) { 2330 if (!read_region(MetaspaceShared::hp, addr, 2331 align_up(_mapped_heap_memregion.byte_size(), os::vm_page_size()), 2332 /* do_commit = */ true)) { 2333 dealloc_heap_region(); 2334 log_error(cds)("Failed to read archived heap region into " INTPTR_FORMAT, p2i(addr)); 2335 return false; 2336 } 2337 // Checks for VerifySharedSpaces is already done inside read_region() 2338 base = addr; 2339 } else { 2340 base = map_memory(_fd, _full_path, r->file_offset(), 2341 addr, _mapped_heap_memregion.byte_size(), r->read_only(), 2342 r->allow_exec()); 2343 if (base == nullptr || base != addr) { 2344 dealloc_heap_region(); 2345 log_info(cds)("UseSharedSpaces: Unable to map at required address in java heap. " 2346 INTPTR_FORMAT ", size = " SIZE_FORMAT " bytes", 2347 p2i(addr), _mapped_heap_memregion.byte_size()); 2348 return false; 2349 } 2350 2351 if (VerifySharedSpaces && !r->check_region_crc(base)) { 2352 dealloc_heap_region(); 2353 log_info(cds)("UseSharedSpaces: mapped heap region is corrupt"); 2354 return false; 2355 } 2356 } 2357 2358 r->set_mapped_base(base); 2359 2360 // If the requested range is different from the range allocated by GC, then 2361 // the pointers need to be patched. 2362 address mapped_start = (address) _mapped_heap_memregion.start(); 2363 ptrdiff_t delta = mapped_start - requested_start; 2364 if (UseCompressedOops && 2365 (narrow_oop_mode() != CompressedOops::mode() || 2366 narrow_oop_shift() != CompressedOops::shift())) { 2367 _heap_pointers_need_patching = true; 2368 } 2369 if (delta != 0) { 2370 _heap_pointers_need_patching = true; 2371 } 2372 ArchiveHeapLoader::init_mapped_heap_info(mapped_start, delta, narrow_oop_shift()); 2373 2374 if (_heap_pointers_need_patching) { 2375 char* bitmap_base = map_bitmap_region(); 2376 if (bitmap_base == nullptr) { 2377 log_info(cds)("CDS heap cannot be used because bitmap region cannot be mapped"); 2378 dealloc_heap_region(); 2379 unmap_region(MetaspaceShared::hp); 2380 _heap_pointers_need_patching = false; 2381 return false; 2382 } 2383 } 2384 log_info(cds)("Heap data mapped at " INTPTR_FORMAT ", size = " SIZE_FORMAT_W(8) " bytes", 2385 p2i(mapped_start), _mapped_heap_memregion.byte_size()); 2386 log_info(cds)("CDS heap data relocation delta = " INTX_FORMAT " bytes", delta); 2387 return true; 2388 } 2389 2390 narrowOop FileMapInfo::encoded_heap_region_dumptime_address() { 2391 assert(CDSConfig::is_using_archive(), "runtime only"); 2392 assert(UseCompressedOops, "sanity"); 2393 FileMapRegion* r = region_at(MetaspaceShared::hp); 2394 return CompressedOops::narrow_oop_cast(r->mapping_offset() >> narrow_oop_shift()); 2395 } 2396 2397 void FileMapInfo::patch_heap_embedded_pointers() { 2398 if (!ArchiveHeapLoader::is_mapped() || !_heap_pointers_need_patching) { 2399 return; 2400 } 2401 2402 char* bitmap_base = map_bitmap_region(); 2403 assert(bitmap_base != nullptr, "must have already been mapped"); 2404 2405 FileMapRegion* r = region_at(MetaspaceShared::hp); 2406 ArchiveHeapLoader::patch_embedded_pointers( 2407 this, _mapped_heap_memregion, 2408 (address)(region_at(MetaspaceShared::bm)->mapped_base()) + r->oopmap_offset(), 2409 r->oopmap_size_in_bits()); 2410 } 2411 2412 void FileMapInfo::fixup_mapped_heap_region() { 2413 if (ArchiveHeapLoader::is_mapped()) { 2414 assert(!_mapped_heap_memregion.is_empty(), "sanity"); 2415 2416 // Populate the archive regions' G1BlockOffsetTables. That ensures 2417 // fast G1BlockOffsetTable::block_start operations for any given address 2418 // within the archive regions when trying to find start of an object 2419 // (e.g. during card table scanning). 2420 G1CollectedHeap::heap()->populate_archive_regions_bot(_mapped_heap_memregion); 2421 } 2422 } 2423 2424 // dealloc the archive regions from java heap 2425 void FileMapInfo::dealloc_heap_region() { 2426 G1CollectedHeap::heap()->dealloc_archive_regions(_mapped_heap_memregion); 2427 } 2428 #endif // INCLUDE_CDS_JAVA_HEAP 2429 2430 void FileMapInfo::unmap_regions(int regions[], int num_regions) { 2431 for (int r = 0; r < num_regions; r++) { 2432 int idx = regions[r]; 2433 unmap_region(idx); 2434 } 2435 } 2436 2437 // Unmap a memory region in the address space. 2438 2439 void FileMapInfo::unmap_region(int i) { 2440 FileMapRegion* r = region_at(i); 2441 char* mapped_base = r->mapped_base(); 2442 size_t size = r->used_aligned(); 2443 2444 if (mapped_base != nullptr) { 2445 if (size > 0 && r->mapped_from_file()) { 2446 log_info(cds)("Unmapping region #%d at base " INTPTR_FORMAT " (%s)", i, p2i(mapped_base), 2447 shared_region_name[i]); 2448 if (!os::unmap_memory(mapped_base, size)) { 2449 fatal("os::unmap_memory failed"); 2450 } 2451 } 2452 r->set_mapped_base(nullptr); 2453 } 2454 } 2455 2456 void FileMapInfo::assert_mark(bool check) { 2457 if (!check) { 2458 MetaspaceShared::unrecoverable_loading_error("Mark mismatch while restoring from shared file."); 2459 } 2460 } 2461 2462 FileMapInfo* FileMapInfo::_current_info = nullptr; 2463 FileMapInfo* FileMapInfo::_dynamic_archive_info = nullptr; 2464 bool FileMapInfo::_heap_pointers_need_patching = false; 2465 SharedPathTable FileMapInfo::_shared_path_table; 2466 bool FileMapInfo::_validating_shared_path_table = false; 2467 bool FileMapInfo::_memory_mapping_failed = false; 2468 GrowableArray<const char*>* FileMapInfo::_non_existent_class_paths = nullptr; 2469 2470 // Open the shared archive file, read and validate the header 2471 // information (version, boot classpath, etc.). If initialization 2472 // fails, shared spaces are disabled and the file is closed. 2473 // 2474 // Validation of the archive is done in two steps: 2475 // 2476 // [1] validate_header() - done here. 2477 // [2] validate_shared_path_table - this is done later, because the table is in the RW 2478 // region of the archive, which is not mapped yet. 2479 bool FileMapInfo::initialize() { 2480 assert(CDSConfig::is_using_archive(), "UseSharedSpaces expected."); 2481 assert(Arguments::has_jimage(), "The shared archive file cannot be used with an exploded module build."); 2482 2483 if (JvmtiExport::should_post_class_file_load_hook() && JvmtiExport::has_early_class_hook_env()) { 2484 // CDS assumes that no classes resolved in vmClasses::resolve_all() 2485 // are replaced at runtime by JVMTI ClassFileLoadHook. All of those classes are resolved 2486 // during the JVMTI "early" stage, so we can still use CDS if 2487 // JvmtiExport::has_early_class_hook_env() is false. 2488 log_info(cds)("CDS is disabled because early JVMTI ClassFileLoadHook is in use."); 2489 return false; 2490 } 2491 2492 if (!open_for_read() || !init_from_file(_fd) || !validate_header()) { 2493 if (_is_static) { 2494 log_info(cds)("Initialize static archive failed."); 2495 return false; 2496 } else { 2497 log_info(cds)("Initialize dynamic archive failed."); 2498 if (AutoCreateSharedArchive) { 2499 CDSConfig::enable_dumping_dynamic_archive(); 2500 ArchiveClassesAtExit = CDSConfig::dynamic_archive_path(); 2501 } 2502 return false; 2503 } 2504 } 2505 2506 return true; 2507 } 2508 2509 bool FileMapInfo::validate_aot_class_linking() { 2510 // These checks need to be done after FileMapInfo::initialize(), which gets called before Universe::heap() 2511 // is available. 2512 if (header()->has_aot_linked_classes()) { 2513 CDSConfig::set_has_aot_linked_classes(is_static(), true); 2514 if (JvmtiExport::should_post_class_file_load_hook()) { 2515 log_error(cds)("CDS archive has aot-linked classes. It cannot be used when JVMTI ClassFileLoadHook is in use."); 2516 return false; 2517 } 2518 if (JvmtiExport::has_early_vmstart_env()) { 2519 log_error(cds)("CDS archive has aot-linked classes. It cannot be used when JVMTI early vm start is in use."); 2520 return false; 2521 } 2522 if (!CDSConfig::is_using_full_module_graph() && !CDSConfig::is_dumping_final_static_archive()) { 2523 log_error(cds)("CDS archive has aot-linked classes. It cannot be used when archived full module graph is not used."); 2524 return false; 2525 } 2526 if (header()->gc_kind() != (int)Universe::heap()->kind()) { 2527 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)", 2528 header()->gc_name(), Universe::heap()->name()); 2529 return false; 2530 } 2531 } 2532 2533 return true; 2534 } 2535 2536 // The 2 core spaces are RW->RO 2537 FileMapRegion* FileMapInfo::first_core_region() const { 2538 return region_at(MetaspaceShared::rw); 2539 } 2540 2541 FileMapRegion* FileMapInfo::last_core_region() const { 2542 return region_at(MetaspaceShared::ro); 2543 } 2544 2545 void FileMapInfo::print(outputStream* st) const { 2546 header()->print(st); 2547 if (!is_static()) { 2548 dynamic_header()->print(st); 2549 } 2550 } 2551 2552 void FileMapHeader::set_as_offset(char* p, size_t *offset) { 2553 *offset = ArchiveBuilder::current()->any_to_offset((address)p); 2554 } 2555 2556 int FileMapHeader::compute_crc() { 2557 char* start = (char*)this; 2558 // start computing from the field after _header_size to end of base archive name. 2559 char* buf = (char*)&(_generic_header._header_size) + sizeof(_generic_header._header_size); 2560 size_t sz = header_size() - (buf - start); 2561 int crc = ClassLoader::crc32(0, buf, (jint)sz); 2562 return crc; 2563 } 2564 2565 // This function should only be called during run time with UseSharedSpaces enabled. 2566 bool FileMapHeader::validate() { 2567 if (_obj_alignment != ObjectAlignmentInBytes) { 2568 log_info(cds)("The shared archive file's ObjectAlignmentInBytes of %d" 2569 " does not equal the current ObjectAlignmentInBytes of %d.", 2570 _obj_alignment, ObjectAlignmentInBytes); 2571 return false; 2572 } 2573 if (_compact_strings != CompactStrings) { 2574 log_info(cds)("The shared archive file's CompactStrings setting (%s)" 2575 " does not equal the current CompactStrings setting (%s).", 2576 _compact_strings ? "enabled" : "disabled", 2577 CompactStrings ? "enabled" : "disabled"); 2578 return false; 2579 } 2580 2581 // This must be done after header validation because it might change the 2582 // header data 2583 const char* prop = Arguments::get_property("java.system.class.loader"); 2584 if (prop != nullptr) { 2585 log_warning(cds)("Archived non-system classes are disabled because the " 2586 "java.system.class.loader property is specified (value = \"%s\"). " 2587 "To use archived non-system classes, this property must not be set", prop); 2588 _has_platform_or_app_classes = false; 2589 } 2590 2591 2592 if (!_verify_local && BytecodeVerificationLocal) { 2593 // we cannot load boot classes, so there's no point of using the CDS archive 2594 log_info(cds)("The shared archive file's BytecodeVerificationLocal setting (%s)" 2595 " does not equal the current BytecodeVerificationLocal setting (%s).", 2596 _verify_local ? "enabled" : "disabled", 2597 BytecodeVerificationLocal ? "enabled" : "disabled"); 2598 return false; 2599 } 2600 2601 // For backwards compatibility, we don't check the BytecodeVerificationRemote setting 2602 // if the archive only contains system classes. 2603 if (_has_platform_or_app_classes 2604 && !_verify_remote // we didn't verify the archived platform/app classes 2605 && BytecodeVerificationRemote) { // but we want to verify all loaded platform/app classes 2606 log_info(cds)("The shared archive file was created with less restrictive " 2607 "verification setting than the current setting."); 2608 // Pretend that we didn't have any archived platform/app classes, so they won't be loaded 2609 // by SystemDictionaryShared. 2610 _has_platform_or_app_classes = false; 2611 } 2612 2613 // Java agents are allowed during run time. Therefore, the following condition is not 2614 // checked: (!_allow_archiving_with_java_agent && AllowArchivingWithJavaAgent) 2615 // Note: _allow_archiving_with_java_agent is set in the shared archive during dump time 2616 // while AllowArchivingWithJavaAgent is set during the current run. 2617 if (_allow_archiving_with_java_agent && !AllowArchivingWithJavaAgent) { 2618 log_warning(cds)("The setting of the AllowArchivingWithJavaAgent is different " 2619 "from the setting in the shared archive."); 2620 return false; 2621 } 2622 2623 if (_allow_archiving_with_java_agent) { 2624 log_warning(cds)("This archive was created with AllowArchivingWithJavaAgent. It should be used " 2625 "for testing purposes only and should not be used in a production environment"); 2626 } 2627 2628 log_info(cds)("Archive was created with UseCompressedOops = %d, UseCompressedClassPointers = %d", 2629 compressed_oops(), compressed_class_pointers()); 2630 if (compressed_oops() != UseCompressedOops || compressed_class_pointers() != UseCompressedClassPointers) { 2631 log_info(cds)("Unable to use shared archive.\nThe saved state of UseCompressedOops and UseCompressedClassPointers is " 2632 "different from runtime, CDS will be disabled."); 2633 return false; 2634 } 2635 2636 if (! _use_secondary_supers_table && UseSecondarySupersTable) { 2637 log_warning(cds)("The shared archive was created without UseSecondarySupersTable."); 2638 return false; 2639 } 2640 2641 if (!_use_optimized_module_handling && !CDSConfig::is_dumping_final_static_archive()) { 2642 CDSConfig::stop_using_optimized_module_handling(); 2643 log_info(cds)("optimized module handling: disabled because archive was created without optimized module handling"); 2644 } 2645 2646 if (is_static()) { 2647 // Only the static archive can contain the full module graph. 2648 if (!_has_full_module_graph) { 2649 CDSConfig::stop_using_full_module_graph("archive was created without full module graph"); 2650 } 2651 2652 if (_has_archived_invokedynamic) { 2653 CDSConfig::set_has_archived_invokedynamic(); 2654 } 2655 if (_has_archived_packages) { 2656 CDSConfig::set_is_loading_packages(); 2657 } 2658 if (_has_archived_protection_domains) { 2659 CDSConfig::set_is_loading_protection_domains(); 2660 } 2661 } 2662 2663 return true; 2664 } 2665 2666 bool FileMapInfo::validate_header() { 2667 if (!header()->validate()) { 2668 return false; 2669 } 2670 if (_is_static) { 2671 return true; 2672 } else { 2673 return DynamicArchive::validate(this); 2674 } 2675 } 2676 2677 #if INCLUDE_JVMTI 2678 ClassPathEntry** FileMapInfo::_classpath_entries_for_jvmti = nullptr; 2679 2680 ClassPathEntry* FileMapInfo::get_classpath_entry_for_jvmti(int i, TRAPS) { 2681 if (i == 0) { 2682 // index 0 corresponds to the ClassPathImageEntry which is a globally shared object 2683 // and should never be deleted. 2684 return ClassLoader::get_jrt_entry(); 2685 } 2686 ClassPathEntry* ent = _classpath_entries_for_jvmti[i]; 2687 if (ent == nullptr) { 2688 SharedClassPathEntry* scpe = shared_path(i); 2689 assert(scpe->is_jar(), "must be"); // other types of scpe will not produce archived classes 2690 2691 const char* path = scpe->name(); 2692 struct stat st; 2693 if (os::stat(path, &st) != 0) { 2694 char *msg = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(path) + 128); 2695 jio_snprintf(msg, strlen(path) + 127, "error in finding JAR file %s", path); 2696 THROW_MSG_(vmSymbols::java_io_IOException(), msg, nullptr); 2697 } else { 2698 ent = ClassLoader::create_class_path_entry(THREAD, path, &st, false, false); 2699 if (ent == nullptr) { 2700 char *msg = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(path) + 128); 2701 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path); 2702 THROW_MSG_(vmSymbols::java_io_IOException(), msg, nullptr); 2703 } 2704 } 2705 2706 MutexLocker mu(THREAD, CDSClassFileStream_lock); 2707 if (_classpath_entries_for_jvmti[i] == nullptr) { 2708 _classpath_entries_for_jvmti[i] = ent; 2709 } else { 2710 // Another thread has beat me to creating this entry 2711 delete ent; 2712 ent = _classpath_entries_for_jvmti[i]; 2713 } 2714 } 2715 2716 return ent; 2717 } 2718 2719 ClassFileStream* FileMapInfo::open_stream_for_jvmti(InstanceKlass* ik, Handle class_loader, TRAPS) { 2720 int path_index = ik->shared_classpath_index(); 2721 assert(path_index >= 0, "should be called for shared built-in classes only"); 2722 assert(path_index < (int)get_number_of_shared_paths(), "sanity"); 2723 2724 ClassPathEntry* cpe = get_classpath_entry_for_jvmti(path_index, CHECK_NULL); 2725 assert(cpe != nullptr, "must be"); 2726 2727 Symbol* name = ik->name(); 2728 const char* const class_name = name->as_C_string(); 2729 const char* const file_name = ClassLoader::file_name_for_class_name(class_name, 2730 name->utf8_length()); 2731 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader()); 2732 ClassFileStream* cfs = cpe->open_stream_for_loader(THREAD, file_name, loader_data); 2733 assert(cfs != nullptr, "must be able to read the classfile data of shared classes for built-in loaders."); 2734 log_debug(cds, jvmti)("classfile data for %s [%d: %s] = %d bytes", class_name, path_index, 2735 cfs->source(), cfs->length()); 2736 return cfs; 2737 } 2738 2739 #endif --- EOF ---