1 /* 2 * Copyright (c) 2003, 2022, 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/archiveUtils.inline.hpp" 29 #include "cds/cds_globals.hpp" 30 #include "cds/dynamicArchive.hpp" 31 #include "cds/filemap.hpp" 32 #include "cds/heapShared.hpp" 33 #include "cds/metaspaceShared.hpp" 34 #include "classfile/altHashing.hpp" 35 #include "classfile/classFileStream.hpp" 36 #include "classfile/classLoader.hpp" 37 #include "classfile/classLoader.inline.hpp" 38 #include "classfile/classLoaderData.inline.hpp" 39 #include "classfile/classLoaderExt.hpp" 40 #include "classfile/symbolTable.hpp" 41 #include "classfile/systemDictionaryShared.hpp" 42 #include "classfile/vmClasses.hpp" 43 #include "classfile/vmSymbols.hpp" 44 #include "jvm.h" 45 #include "logging/log.hpp" 46 #include "logging/logStream.hpp" 47 #include "logging/logMessage.hpp" 48 #include "memory/iterator.inline.hpp" 49 #include "memory/metadataFactory.hpp" 50 #include "memory/metaspaceClosure.hpp" 51 #include "memory/oopFactory.hpp" 52 #include "memory/universe.hpp" 53 #include "oops/compressedOops.hpp" 54 #include "oops/compressedOops.inline.hpp" 55 #include "oops/objArrayOop.hpp" 56 #include "oops/oop.inline.hpp" 57 #include "prims/jvmtiExport.hpp" 58 #include "runtime/arguments.hpp" 59 #include "runtime/globals_extension.hpp" 60 #include "runtime/java.hpp" 61 #include "runtime/mutexLocker.hpp" 62 #include "runtime/os.hpp" 63 #include "runtime/vm_version.hpp" 64 #include "services/memTracker.hpp" 65 #include "utilities/align.hpp" 66 #include "utilities/bitMap.inline.hpp" 67 #include "utilities/classpathStream.hpp" 68 #include "utilities/defaultStream.hpp" 69 #include "utilities/ostream.hpp" 70 #if INCLUDE_G1GC 71 #include "gc/g1/g1CollectedHeap.hpp" 72 #include "gc/g1/heapRegion.hpp" 73 #endif 74 75 # include <sys/stat.h> 76 # include <errno.h> 77 78 #ifndef O_BINARY // if defined (Win32) use binary files. 79 #define O_BINARY 0 // otherwise do nothing. 80 #endif 81 82 // Complain and stop. All error conditions occurring during the writing of 83 // an archive file should stop the process. Unrecoverable errors during 84 // the reading of the archive file should stop the process. 85 86 static void fail_exit(const char *msg, va_list ap) { 87 // This occurs very early during initialization: tty is not initialized. 88 jio_fprintf(defaultStream::error_stream(), 89 "An error has occurred while processing the" 90 " shared archive file.\n"); 91 jio_vfprintf(defaultStream::error_stream(), msg, ap); 92 jio_fprintf(defaultStream::error_stream(), "\n"); 93 // Do not change the text of the below message because some tests check for it. 94 vm_exit_during_initialization("Unable to use shared archive.", NULL); 95 } 96 97 98 void FileMapInfo::fail_stop(const char *msg, ...) { 99 va_list ap; 100 va_start(ap, msg); 101 fail_exit(msg, ap); // Never returns. 102 va_end(ap); // for completeness. 103 } 104 105 106 // Complain and continue. Recoverable errors during the reading of the 107 // archive file may continue (with sharing disabled). 108 // 109 // If we continue, then disable shared spaces and close the file. 110 111 void FileMapInfo::fail_continue(const char *msg, ...) { 112 va_list ap; 113 va_start(ap, msg); 114 fail_continue_impl(LogLevel::Info, msg, ap); 115 va_end(ap); 116 } 117 118 void FileMapInfo::fail_continue(LogLevelType level, const char *msg, ...) { 119 va_list ap; 120 va_start(ap, msg); 121 fail_continue_impl(level, msg, ap); 122 va_end(ap); 123 } 124 125 void FileMapInfo::fail_continue_impl(LogLevelType level, const char *msg, va_list ap) { 126 if (PrintSharedArchiveAndExit && _validating_shared_path_table) { 127 // If we are doing PrintSharedArchiveAndExit and some of the classpath entries 128 // do not validate, we can still continue "limping" to validate the remaining 129 // entries. No need to quit. 130 tty->print("["); 131 tty->vprint(msg, ap); 132 tty->print_cr("]"); 133 } else { 134 if (RequireSharedSpaces) { 135 fail_exit(msg, ap); 136 } else { 137 LogMessage(cds) lm; 138 lm.vwrite(level, msg, ap); 139 } 140 } 141 } 142 143 // Fill in the fileMapInfo structure with data about this VM instance. 144 145 // This method copies the vm version info into header_version. If the version is too 146 // long then a truncated version, which has a hash code appended to it, is copied. 147 // 148 // Using a template enables this method to verify that header_version is an array of 149 // length JVM_IDENT_MAX. This ensures that the code that writes to the CDS file and 150 // the code that reads the CDS file will both use the same size buffer. Hence, will 151 // use identical truncation. This is necessary for matching of truncated versions. 152 template <int N> static void get_header_version(char (&header_version) [N]) { 153 assert(N == JVM_IDENT_MAX, "Bad header_version size"); 154 155 const char *vm_version = VM_Version::internal_vm_info_string(); 156 const int version_len = (int)strlen(vm_version); 157 158 memset(header_version, 0, JVM_IDENT_MAX); 159 160 if (version_len < (JVM_IDENT_MAX-1)) { 161 strcpy(header_version, vm_version); 162 163 } else { 164 // Get the hash value. Use a static seed because the hash needs to return the same 165 // value over multiple jvm invocations. 166 uint32_t hash = AltHashing::halfsiphash_32(8191, (const uint8_t*)vm_version, version_len); 167 168 // Truncate the ident, saving room for the 8 hex character hash value. 169 strncpy(header_version, vm_version, JVM_IDENT_MAX-9); 170 171 // Append the hash code as eight hex digits. 172 os::snprintf_checked(&header_version[JVM_IDENT_MAX-9], 9, "%08x", hash); 173 header_version[JVM_IDENT_MAX-1] = 0; // Null terminate. 174 } 175 176 assert(header_version[JVM_IDENT_MAX-1] == 0, "must be"); 177 } 178 179 FileMapInfo::FileMapInfo(const char* full_path, bool is_static) : 180 _is_static(is_static), _file_open(false), _is_mapped(false), _fd(-1), _file_offset(0), 181 _full_path(full_path), _base_archive_name(nullptr), _header(nullptr) { 182 if (_is_static) { 183 assert(_current_info == NULL, "must be singleton"); // not thread safe 184 _current_info = this; 185 } else { 186 assert(_dynamic_archive_info == NULL, "must be singleton"); // not thread safe 187 _dynamic_archive_info = this; 188 } 189 } 190 191 FileMapInfo::~FileMapInfo() { 192 if (_is_static) { 193 assert(_current_info == this, "must be singleton"); // not thread safe 194 _current_info = NULL; 195 } else { 196 assert(_dynamic_archive_info == this, "must be singleton"); // not thread safe 197 _dynamic_archive_info = NULL; 198 } 199 200 if (_header != nullptr) { 201 os::free(_header); 202 } 203 204 if (_file_open) { 205 ::close(_fd); 206 } 207 } 208 209 void FileMapInfo::populate_header(size_t core_region_alignment) { 210 assert(_header == NULL, "Sanity check"); 211 size_t c_header_size; 212 size_t header_size; 213 size_t base_archive_name_size = 0; 214 size_t base_archive_name_offset = 0; 215 size_t longest_common_prefix_size = 0; 216 if (is_static()) { 217 c_header_size = sizeof(FileMapHeader); 218 header_size = c_header_size; 219 } else { 220 // dynamic header including base archive name for non-default base archive 221 c_header_size = sizeof(DynamicArchiveHeader); 222 header_size = c_header_size; 223 224 const char* default_base_archive_name = Arguments::get_default_shared_archive_path(); 225 const char* current_base_archive_name = Arguments::GetSharedArchivePath(); 226 if (!os::same_files(current_base_archive_name, default_base_archive_name)) { 227 base_archive_name_size = strlen(current_base_archive_name) + 1; 228 header_size += base_archive_name_size; 229 base_archive_name_offset = c_header_size; 230 } 231 FREE_C_HEAP_ARRAY(const char, default_base_archive_name); 232 } 233 ResourceMark rm; 234 GrowableArray<const char*>* app_cp_array = create_dumptime_app_classpath_array(); 235 int len = app_cp_array->length(); 236 longest_common_prefix_size = longest_common_app_classpath_prefix_len(len, app_cp_array); 237 _header = (FileMapHeader*)os::malloc(header_size, mtInternal); 238 memset((void*)_header, 0, header_size); 239 _header->populate(this, 240 core_region_alignment, 241 header_size, 242 base_archive_name_size, 243 base_archive_name_offset, 244 longest_common_prefix_size); 245 } 246 247 void FileMapHeader::populate(FileMapInfo *info, size_t core_region_alignment, 248 size_t header_size, size_t base_archive_name_size, 249 size_t base_archive_name_offset, size_t common_app_classpath_prefix_size) { 250 // 1. We require _generic_header._magic to be at the beginning of the file 251 // 2. FileMapHeader also assumes that _generic_header is at the beginning of the file 252 assert(offset_of(FileMapHeader, _generic_header) == 0, "must be"); 253 set_header_size((unsigned int)header_size); 254 set_base_archive_name_offset((unsigned int)base_archive_name_offset); 255 set_base_archive_name_size((unsigned int)base_archive_name_size); 256 set_common_app_classpath_prefix_size((unsigned int)common_app_classpath_prefix_size); 257 set_magic(DynamicDumpSharedSpaces ? CDS_DYNAMIC_ARCHIVE_MAGIC : CDS_ARCHIVE_MAGIC); 258 set_version(CURRENT_CDS_ARCHIVE_VERSION); 259 260 if (!info->is_static() && base_archive_name_size != 0) { 261 // copy base archive name 262 copy_base_archive_name(Arguments::GetSharedArchivePath()); 263 } 264 _core_region_alignment = core_region_alignment; 265 _obj_alignment = ObjectAlignmentInBytes; 266 _compact_strings = CompactStrings; 267 if (DumpSharedSpaces && HeapShared::can_write()) { 268 _narrow_oop_mode = CompressedOops::mode(); 269 _narrow_oop_base = CompressedOops::base(); 270 _narrow_oop_shift = CompressedOops::shift(); 271 if (UseCompressedOops) { 272 _heap_begin = CompressedOops::begin(); 273 _heap_end = CompressedOops::end(); 274 } else { 275 #if INCLUDE_G1GC 276 address start = (address)G1CollectedHeap::heap()->reserved().start(); 277 address end = (address)G1CollectedHeap::heap()->reserved().end(); 278 _heap_begin = HeapShared::to_requested_address(start); 279 _heap_end = HeapShared::to_requested_address(end); 280 #endif 281 } 282 } 283 _compressed_oops = UseCompressedOops; 284 _compressed_class_ptrs = UseCompressedClassPointers; 285 _max_heap_size = MaxHeapSize; 286 _narrow_klass_shift = CompressedKlassPointers::shift(); 287 _use_optimized_module_handling = MetaspaceShared::use_optimized_module_handling(); 288 _use_full_module_graph = MetaspaceShared::use_full_module_graph(); 289 290 // The following fields are for sanity checks for whether this archive 291 // will function correctly with this JVM and the bootclasspath it's 292 // invoked with. 293 294 // JVM version string ... changes on each build. 295 get_header_version(_jvm_ident); 296 297 _app_class_paths_start_index = ClassLoaderExt::app_class_paths_start_index(); 298 _app_module_paths_start_index = ClassLoaderExt::app_module_paths_start_index(); 299 _num_module_paths = ClassLoader::num_module_path_entries(); 300 _max_used_path_index = ClassLoaderExt::max_used_path_index(); 301 302 _verify_local = BytecodeVerificationLocal; 303 _verify_remote = BytecodeVerificationRemote; 304 _has_platform_or_app_classes = ClassLoaderExt::has_platform_or_app_classes(); 305 _has_non_jar_in_classpath = ClassLoaderExt::has_non_jar_in_classpath(); 306 _requested_base_address = (char*)SharedBaseAddress; 307 _mapped_base_address = (char*)SharedBaseAddress; 308 _allow_archiving_with_java_agent = AllowArchivingWithJavaAgent; 309 310 if (!DynamicDumpSharedSpaces) { 311 set_shared_path_table(info->_shared_path_table); 312 } 313 } 314 315 void FileMapHeader::copy_base_archive_name(const char* archive) { 316 assert(base_archive_name_size() != 0, "_base_archive_name_size not set"); 317 assert(base_archive_name_offset() != 0, "_base_archive_name_offset not set"); 318 assert(header_size() > sizeof(*this), "_base_archive_name_size not included in header size?"); 319 memcpy((char*)this + base_archive_name_offset(), archive, base_archive_name_size()); 320 } 321 322 void FileMapHeader::print(outputStream* st) { 323 ResourceMark rm; 324 325 st->print_cr("- magic: 0x%08x", magic()); 326 st->print_cr("- crc: 0x%08x", crc()); 327 st->print_cr("- version: 0x%x", version()); 328 st->print_cr("- header_size: " UINT32_FORMAT, header_size()); 329 st->print_cr("- common_app_classpath_size: " UINT32_FORMAT, common_app_classpath_prefix_size()); 330 st->print_cr("- base_archive_name_offset: " UINT32_FORMAT, base_archive_name_offset()); 331 st->print_cr("- base_archive_name_size: " UINT32_FORMAT, base_archive_name_size()); 332 333 for (int i = 0; i < NUM_CDS_REGIONS; i++) { 334 FileMapRegion* r = region_at(i); 335 r->print(st, i); 336 } 337 st->print_cr("============ end regions ======== "); 338 339 st->print_cr("- core_region_alignment: " SIZE_FORMAT, _core_region_alignment); 340 st->print_cr("- obj_alignment: %d", _obj_alignment); 341 st->print_cr("- narrow_oop_base: " INTPTR_FORMAT, p2i(_narrow_oop_base)); 342 st->print_cr("- narrow_oop_base: " INTPTR_FORMAT, p2i(_narrow_oop_base)); 343 st->print_cr("- narrow_oop_shift %d", _narrow_oop_shift); 344 st->print_cr("- compact_strings: %d", _compact_strings); 345 st->print_cr("- max_heap_size: " UINTX_FORMAT, _max_heap_size); 346 st->print_cr("- narrow_oop_mode: %d", _narrow_oop_mode); 347 st->print_cr("- narrow_klass_shift: %d", _narrow_klass_shift); 348 st->print_cr("- compressed_oops: %d", _compressed_oops); 349 st->print_cr("- compressed_class_ptrs: %d", _compressed_class_ptrs); 350 st->print_cr("- cloned_vtables_offset: " SIZE_FORMAT_X, _cloned_vtables_offset); 351 st->print_cr("- serialized_data_offset: " SIZE_FORMAT_X, _serialized_data_offset); 352 st->print_cr("- heap_begin: " INTPTR_FORMAT, p2i(_heap_begin)); 353 st->print_cr("- heap_end: " INTPTR_FORMAT, p2i(_heap_end)); 354 st->print_cr("- jvm_ident: %s", _jvm_ident); 355 st->print_cr("- shared_path_table_offset: " SIZE_FORMAT_X, _shared_path_table_offset); 356 st->print_cr("- shared_path_table_size: %d", _shared_path_table_size); 357 st->print_cr("- app_class_paths_start_index: %d", _app_class_paths_start_index); 358 st->print_cr("- app_module_paths_start_index: %d", _app_module_paths_start_index); 359 st->print_cr("- num_module_paths: %d", _num_module_paths); 360 st->print_cr("- max_used_path_index: %d", _max_used_path_index); 361 st->print_cr("- verify_local: %d", _verify_local); 362 st->print_cr("- verify_remote: %d", _verify_remote); 363 st->print_cr("- has_platform_or_app_classes: %d", _has_platform_or_app_classes); 364 st->print_cr("- has_non_jar_in_classpath: %d", _has_non_jar_in_classpath); 365 st->print_cr("- requested_base_address: " INTPTR_FORMAT, p2i(_requested_base_address)); 366 st->print_cr("- mapped_base_address: " INTPTR_FORMAT, p2i(_mapped_base_address)); 367 st->print_cr("- allow_archiving_with_java_agent:%d", _allow_archiving_with_java_agent); 368 st->print_cr("- use_optimized_module_handling: %d", _use_optimized_module_handling); 369 st->print_cr("- use_full_module_graph %d", _use_full_module_graph); 370 st->print_cr("- ptrmap_size_in_bits: " SIZE_FORMAT, _ptrmap_size_in_bits); 371 } 372 373 void SharedClassPathEntry::init_as_non_existent(const char* path, TRAPS) { 374 _type = non_existent_entry; 375 set_name(path, CHECK); 376 } 377 378 void SharedClassPathEntry::init(bool is_modules_image, 379 bool is_module_path, 380 ClassPathEntry* cpe, TRAPS) { 381 Arguments::assert_is_dumping_archive(); 382 _timestamp = 0; 383 _filesize = 0; 384 _from_class_path_attr = false; 385 386 struct stat st; 387 if (os::stat(cpe->name(), &st) == 0) { 388 if ((st.st_mode & S_IFMT) == S_IFDIR) { 389 _type = dir_entry; 390 } else { 391 // The timestamp of the modules_image is not checked at runtime. 392 if (is_modules_image) { 393 _type = modules_image_entry; 394 } else { 395 _type = jar_entry; 396 _timestamp = st.st_mtime; 397 _from_class_path_attr = cpe->from_class_path_attr(); 398 } 399 _filesize = st.st_size; 400 _is_module_path = is_module_path; 401 } 402 } else { 403 // The file/dir must exist, or it would not have been added 404 // into ClassLoader::classpath_entry(). 405 // 406 // If we can't access a jar file in the boot path, then we can't 407 // make assumptions about where classes get loaded from. 408 FileMapInfo::fail_stop("Unable to open file %s.", cpe->name()); 409 } 410 411 // No need to save the name of the module file, as it will be computed at run time 412 // to allow relocation of the JDK directory. 413 const char* name = is_modules_image ? "" : cpe->name(); 414 set_name(name, CHECK); 415 } 416 417 void SharedClassPathEntry::set_name(const char* name, TRAPS) { 418 size_t len = strlen(name) + 1; 419 _name = MetadataFactory::new_array<char>(ClassLoaderData::the_null_class_loader_data(), (int)len, CHECK); 420 strcpy(_name->data(), name); 421 } 422 423 void SharedClassPathEntry::copy_from(SharedClassPathEntry* ent, ClassLoaderData* loader_data, TRAPS) { 424 _type = ent->_type; 425 _is_module_path = ent->_is_module_path; 426 _timestamp = ent->_timestamp; 427 _filesize = ent->_filesize; 428 _from_class_path_attr = ent->_from_class_path_attr; 429 set_name(ent->name(), CHECK); 430 431 if (ent->is_jar() && !ent->is_signed() && ent->manifest() != NULL) { 432 Array<u1>* buf = MetadataFactory::new_array<u1>(loader_data, 433 ent->manifest_size(), 434 CHECK); 435 char* p = (char*)(buf->data()); 436 memcpy(p, ent->manifest(), ent->manifest_size()); 437 set_manifest(buf); 438 } 439 } 440 441 const char* SharedClassPathEntry::name() const { 442 if (UseSharedSpaces && is_modules_image()) { 443 // In order to validate the runtime modules image file size against the archived 444 // size information, we need to obtain the runtime modules image path. The recorded 445 // dump time modules image path in the archive may be different from the runtime path 446 // if the JDK image has beed moved after generating the archive. 447 return ClassLoader::get_jrt_entry()->name(); 448 } else { 449 return _name->data(); 450 } 451 } 452 453 bool SharedClassPathEntry::validate(bool is_class_path) const { 454 assert(UseSharedSpaces, "runtime only"); 455 456 struct stat st; 457 const char* name = this->name(); 458 459 bool ok = true; 460 log_info(class, path)("checking shared classpath entry: %s", name); 461 if (os::stat(name, &st) != 0 && is_class_path) { 462 // If the archived module path entry does not exist at runtime, it is not fatal 463 // (no need to invalid the shared archive) because the shared runtime visibility check 464 // filters out any archived module classes that do not have a matching runtime 465 // module path location. 466 FileMapInfo::fail_continue("Required classpath entry does not exist: %s", name); 467 ok = false; 468 } else if (is_dir()) { 469 if (!os::dir_is_empty(name)) { 470 FileMapInfo::fail_continue("directory is not empty: %s", name); 471 ok = false; 472 } 473 } else if ((has_timestamp() && _timestamp != st.st_mtime) || 474 _filesize != st.st_size) { 475 ok = false; 476 if (PrintSharedArchiveAndExit) { 477 FileMapInfo::fail_continue(_timestamp != st.st_mtime ? 478 "Timestamp mismatch" : 479 "File size mismatch"); 480 } else { 481 const char* bad_jar_msg = "A jar file is not the one used while building the shared archive file:"; 482 FileMapInfo::fail_continue("%s %s", bad_jar_msg, name); 483 if (!log_is_enabled(Info, cds)) { 484 log_warning(cds)("%s %s", bad_jar_msg, name); 485 } 486 if (_timestamp != st.st_mtime) { 487 log_warning(cds)("%s timestamp has changed.", name); 488 } else { 489 log_warning(cds)("%s size has changed.", name); 490 } 491 } 492 } 493 494 if (PrintSharedArchiveAndExit && !ok) { 495 // If PrintSharedArchiveAndExit is enabled, don't report failure to the 496 // caller. Please see above comments for more details. 497 ok = true; 498 MetaspaceShared::set_archive_loading_failed(); 499 } 500 return ok; 501 } 502 503 bool SharedClassPathEntry::check_non_existent() const { 504 assert(_type == non_existent_entry, "must be"); 505 log_info(class, path)("should be non-existent: %s", name()); 506 struct stat st; 507 if (os::stat(name(), &st) != 0) { 508 log_info(class, path)("ok"); 509 return true; // file doesn't exist 510 } else { 511 return false; 512 } 513 } 514 515 516 void SharedClassPathEntry::metaspace_pointers_do(MetaspaceClosure* it) { 517 it->push(&_name); 518 it->push(&_manifest); 519 } 520 521 void SharedPathTable::metaspace_pointers_do(MetaspaceClosure* it) { 522 it->push(&_table); 523 for (int i=0; i<_size; i++) { 524 path_at(i)->metaspace_pointers_do(it); 525 } 526 } 527 528 void SharedPathTable::dumptime_init(ClassLoaderData* loader_data, TRAPS) { 529 size_t entry_size = sizeof(SharedClassPathEntry); 530 int num_entries = 0; 531 num_entries += ClassLoader::num_boot_classpath_entries(); 532 num_entries += ClassLoader::num_app_classpath_entries(); 533 num_entries += ClassLoader::num_module_path_entries(); 534 num_entries += FileMapInfo::num_non_existent_class_paths(); 535 size_t bytes = entry_size * num_entries; 536 537 _table = MetadataFactory::new_array<u8>(loader_data, (int)bytes, CHECK); 538 _size = num_entries; 539 } 540 541 // Make a copy of the _shared_path_table for use during dynamic CDS dump. 542 // It is needed because some Java code continues to execute after dynamic dump has finished. 543 // However, during dynamic dump, we have modified FileMapInfo::_shared_path_table so 544 // FileMapInfo::shared_path(i) returns incorrect information in ClassLoader::record_result(). 545 void FileMapInfo::copy_shared_path_table(ClassLoaderData* loader_data, TRAPS) { 546 size_t entry_size = sizeof(SharedClassPathEntry); 547 size_t bytes = entry_size * _shared_path_table.size(); 548 549 Array<u8>* array = MetadataFactory::new_array<u8>(loader_data, (int)bytes, CHECK); 550 _saved_shared_path_table = SharedPathTable(array, _shared_path_table.size()); 551 552 for (int i = 0; i < _shared_path_table.size(); i++) { 553 _saved_shared_path_table.path_at(i)->copy_from(shared_path(i), loader_data, CHECK); 554 } 555 _saved_shared_path_table_array = array; 556 } 557 558 void FileMapInfo::clone_shared_path_table(TRAPS) { 559 Arguments::assert_is_dumping_archive(); 560 561 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 562 ClassPathEntry* jrt = ClassLoader::get_jrt_entry(); 563 564 assert(jrt != NULL, 565 "No modular java runtime image present when allocating the CDS classpath entry table"); 566 567 if (_saved_shared_path_table_array != NULL) { 568 MetadataFactory::free_array<u8>(loader_data, _saved_shared_path_table_array); 569 _saved_shared_path_table_array = NULL; 570 } 571 572 copy_shared_path_table(loader_data, CHECK); 573 } 574 575 void FileMapInfo::allocate_shared_path_table(TRAPS) { 576 Arguments::assert_is_dumping_archive(); 577 578 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 579 ClassPathEntry* jrt = ClassLoader::get_jrt_entry(); 580 581 assert(jrt != NULL, 582 "No modular java runtime image present when allocating the CDS classpath entry table"); 583 584 _shared_path_table.dumptime_init(loader_data, CHECK); 585 586 // 1. boot class path 587 int i = 0; 588 i = add_shared_classpaths(i, "boot", jrt, CHECK); 589 i = add_shared_classpaths(i, "app", ClassLoader::app_classpath_entries(), CHECK); 590 i = add_shared_classpaths(i, "module", ClassLoader::module_path_entries(), CHECK); 591 592 for (int x = 0; x < num_non_existent_class_paths(); x++, i++) { 593 const char* path = _non_existent_class_paths->at(x); 594 shared_path(i)->init_as_non_existent(path, CHECK); 595 } 596 597 assert(i == _shared_path_table.size(), "number of shared path entry mismatch"); 598 clone_shared_path_table(CHECK); 599 } 600 601 int FileMapInfo::add_shared_classpaths(int i, const char* which, ClassPathEntry *cpe, TRAPS) { 602 while (cpe != NULL) { 603 bool is_jrt = (cpe == ClassLoader::get_jrt_entry()); 604 bool is_module_path = i >= ClassLoaderExt::app_module_paths_start_index(); 605 const char* type = (is_jrt ? "jrt" : (cpe->is_jar_file() ? "jar" : "dir")); 606 log_info(class, path)("add %s shared path (%s) %s", which, type, cpe->name()); 607 SharedClassPathEntry* ent = shared_path(i); 608 ent->init(is_jrt, is_module_path, cpe, CHECK_0); 609 if (cpe->is_jar_file()) { 610 update_jar_manifest(cpe, ent, CHECK_0); 611 } 612 if (is_jrt) { 613 cpe = ClassLoader::get_next_boot_classpath_entry(cpe); 614 } else { 615 cpe = cpe->next(); 616 } 617 i++; 618 } 619 620 return i; 621 } 622 623 void FileMapInfo::check_nonempty_dir_in_shared_path_table() { 624 Arguments::assert_is_dumping_archive(); 625 626 bool has_nonempty_dir = false; 627 628 int last = _shared_path_table.size() - 1; 629 if (last > ClassLoaderExt::max_used_path_index()) { 630 // no need to check any path beyond max_used_path_index 631 last = ClassLoaderExt::max_used_path_index(); 632 } 633 634 for (int i = 0; i <= last; i++) { 635 SharedClassPathEntry *e = shared_path(i); 636 if (e->is_dir()) { 637 const char* path = e->name(); 638 if (!os::dir_is_empty(path)) { 639 log_error(cds)("Error: non-empty directory '%s'", path); 640 has_nonempty_dir = true; 641 } 642 } 643 } 644 645 if (has_nonempty_dir) { 646 ClassLoader::exit_with_path_failure("Cannot have non-empty directory in paths", NULL); 647 } 648 } 649 650 void FileMapInfo::record_non_existent_class_path_entry(const char* path) { 651 Arguments::assert_is_dumping_archive(); 652 log_info(class, path)("non-existent Class-Path entry %s", path); 653 if (_non_existent_class_paths == NULL) { 654 _non_existent_class_paths = new (mtClass) GrowableArray<const char*>(10, mtClass); 655 } 656 _non_existent_class_paths->append(os::strdup(path)); 657 } 658 659 int FileMapInfo::num_non_existent_class_paths() { 660 Arguments::assert_is_dumping_archive(); 661 if (_non_existent_class_paths != NULL) { 662 return _non_existent_class_paths->length(); 663 } else { 664 return 0; 665 } 666 } 667 668 int FileMapInfo::get_module_shared_path_index(Symbol* location) { 669 if (location->starts_with("jrt:", 4) && get_number_of_shared_paths() > 0) { 670 assert(shared_path(0)->is_modules_image(), "first shared_path must be the modules image"); 671 return 0; 672 } 673 674 if (ClassLoaderExt::app_module_paths_start_index() >= get_number_of_shared_paths()) { 675 // The archive(s) were created without --module-path option 676 return -1; 677 } 678 679 if (!location->starts_with("file:", 5)) { 680 return -1; 681 } 682 683 // skip_uri_protocol was also called during dump time -- see ClassLoaderExt::process_module_table() 684 ResourceMark rm; 685 const char* file = ClassLoader::skip_uri_protocol(location->as_C_string()); 686 for (int i = ClassLoaderExt::app_module_paths_start_index(); i < get_number_of_shared_paths(); i++) { 687 SharedClassPathEntry* ent = shared_path(i); 688 assert(ent->in_named_module(), "must be"); 689 bool cond = strcmp(file, ent->name()) == 0; 690 log_debug(class, path)("get_module_shared_path_index (%d) %s : %s = %s", i, 691 location->as_C_string(), ent->name(), cond ? "same" : "different"); 692 if (cond) { 693 return i; 694 } 695 } 696 697 return -1; 698 } 699 700 class ManifestStream: public ResourceObj { 701 private: 702 u1* _buffer_start; // Buffer bottom 703 u1* _buffer_end; // Buffer top (one past last element) 704 u1* _current; // Current buffer position 705 706 public: 707 // Constructor 708 ManifestStream(u1* buffer, int length) : _buffer_start(buffer), 709 _current(buffer) { 710 _buffer_end = buffer + length; 711 } 712 713 static bool is_attr(u1* attr, const char* name) { 714 return strncmp((const char*)attr, name, strlen(name)) == 0; 715 } 716 717 static char* copy_attr(u1* value, size_t len) { 718 char* buf = NEW_RESOURCE_ARRAY(char, len + 1); 719 strncpy(buf, (char*)value, len); 720 buf[len] = 0; 721 return buf; 722 } 723 724 // The return value indicates if the JAR is signed or not 725 bool check_is_signed() { 726 u1* attr = _current; 727 bool isSigned = false; 728 while (_current < _buffer_end) { 729 if (*_current == '\n') { 730 *_current = '\0'; 731 u1* value = (u1*)strchr((char*)attr, ':'); 732 if (value != NULL) { 733 assert(*(value+1) == ' ', "Unrecognized format" ); 734 if (strstr((char*)attr, "-Digest") != NULL) { 735 isSigned = true; 736 break; 737 } 738 } 739 *_current = '\n'; // restore 740 attr = _current + 1; 741 } 742 _current ++; 743 } 744 return isSigned; 745 } 746 }; 747 748 void FileMapInfo::update_jar_manifest(ClassPathEntry *cpe, SharedClassPathEntry* ent, TRAPS) { 749 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 750 ResourceMark rm(THREAD); 751 jint manifest_size; 752 753 assert(cpe->is_jar_file() && ent->is_jar(), "the shared class path entry is not a JAR file"); 754 char* manifest = ClassLoaderExt::read_manifest(THREAD, cpe, &manifest_size); 755 if (manifest != NULL) { 756 ManifestStream* stream = new ManifestStream((u1*)manifest, 757 manifest_size); 758 if (stream->check_is_signed()) { 759 ent->set_is_signed(); 760 } else { 761 // Copy the manifest into the shared archive 762 manifest = ClassLoaderExt::read_raw_manifest(THREAD, cpe, &manifest_size); 763 Array<u1>* buf = MetadataFactory::new_array<u1>(loader_data, 764 manifest_size, 765 CHECK); 766 char* p = (char*)(buf->data()); 767 memcpy(p, manifest, manifest_size); 768 ent->set_manifest(buf); 769 } 770 } 771 } 772 773 char* FileMapInfo::skip_first_path_entry(const char* path) { 774 size_t path_sep_len = strlen(os::path_separator()); 775 char* p = strstr((char*)path, os::path_separator()); 776 if (p != NULL) { 777 debug_only( { 778 size_t image_name_len = strlen(MODULES_IMAGE_NAME); 779 assert(strncmp(p - image_name_len, MODULES_IMAGE_NAME, image_name_len) == 0, 780 "first entry must be the modules image"); 781 } ); 782 p += path_sep_len; 783 } else { 784 debug_only( { 785 assert(ClassLoader::string_ends_with(path, MODULES_IMAGE_NAME), 786 "first entry must be the modules image"); 787 } ); 788 } 789 return p; 790 } 791 792 int FileMapInfo::num_paths(const char* path) { 793 if (path == NULL) { 794 return 0; 795 } 796 int npaths = 1; 797 char* p = (char*)path; 798 while (p != NULL) { 799 char* prev = p; 800 p = strstr((char*)p, os::path_separator()); 801 if (p != NULL) { 802 p++; 803 // don't count empty path 804 if ((p - prev) > 1) { 805 npaths++; 806 } 807 } 808 } 809 return npaths; 810 } 811 812 // Returns true if a path within the paths exists and has non-zero size. 813 bool FileMapInfo::check_paths_existence(const char* paths) { 814 ClasspathStream cp_stream(paths); 815 bool exist = false; 816 struct stat st; 817 while (cp_stream.has_next()) { 818 const char* path = cp_stream.get_next(); 819 if (os::stat(path, &st) == 0 && st.st_size > 0) { 820 exist = true; 821 break; 822 } 823 } 824 return exist; 825 } 826 827 GrowableArray<const char*>* FileMapInfo::create_dumptime_app_classpath_array() { 828 Arguments::assert_is_dumping_archive(); 829 GrowableArray<const char*>* path_array = new GrowableArray<const char*>(10); 830 ClassPathEntry* cpe = ClassLoader::app_classpath_entries(); 831 while (cpe != NULL) { 832 path_array->append(cpe->name()); 833 cpe = cpe->next(); 834 } 835 return path_array; 836 } 837 838 GrowableArray<const char*>* FileMapInfo::create_path_array(const char* paths) { 839 GrowableArray<const char*>* path_array = new GrowableArray<const char*>(10); 840 JavaThread* current = JavaThread::current(); 841 ClasspathStream cp_stream(paths); 842 bool non_jar_in_cp = header()->has_non_jar_in_classpath(); 843 while (cp_stream.has_next()) { 844 const char* path = cp_stream.get_next(); 845 if (!non_jar_in_cp) { 846 struct stat st; 847 if (os::stat(path, &st) == 0) { 848 path_array->append(path); 849 } 850 } else { 851 const char* canonical_path = ClassLoader::get_canonical_path(path, current); 852 if (canonical_path != NULL) { 853 char* error_msg = NULL; 854 jzfile* zip = ClassLoader::open_zip_file(canonical_path, &error_msg, current); 855 if (zip != NULL && error_msg == NULL) { 856 path_array->append(path); 857 } 858 } 859 } 860 } 861 return path_array; 862 } 863 864 bool FileMapInfo::classpath_failure(const char* msg, const char* name) { 865 ClassLoader::trace_class_path(msg, name); 866 if (PrintSharedArchiveAndExit) { 867 MetaspaceShared::set_archive_loading_failed(); 868 } 869 return false; 870 } 871 872 unsigned int FileMapInfo::longest_common_app_classpath_prefix_len(int num_paths, 873 GrowableArray<const char*>* rp_array) { 874 if (num_paths == 0) { 875 return 0; 876 } 877 unsigned int pos; 878 for (pos = 0; ; pos++) { 879 for (int i = 0; i < num_paths; i++) { 880 if (rp_array->at(i)[pos] != '\0' && rp_array->at(i)[pos] == rp_array->at(0)[pos]) { 881 continue; 882 } 883 // search backward for the pos before the file separator char 884 while (pos > 0) { 885 if (rp_array->at(0)[--pos] == *os::file_separator()) { 886 return pos + 1; 887 } 888 } 889 return 0; 890 } 891 } 892 return 0; 893 } 894 895 bool FileMapInfo::check_paths(int shared_path_start_idx, int num_paths, GrowableArray<const char*>* rp_array, 896 unsigned int dumptime_prefix_len, unsigned int runtime_prefix_len) { 897 int i = 0; 898 int j = shared_path_start_idx; 899 while (i < num_paths) { 900 while (shared_path(j)->from_class_path_attr()) { 901 // shared_path(j) was expanded from the JAR file attribute "Class-Path:" 902 // during dump time. It's not included in the -classpath VM argument. 903 j++; 904 } 905 assert(strlen(shared_path(j)->name()) > (size_t)dumptime_prefix_len, "sanity"); 906 const char* dumptime_path = shared_path(j)->name() + dumptime_prefix_len; 907 assert(strlen(rp_array->at(i)) > (size_t)runtime_prefix_len, "sanity"); 908 const char* runtime_path = rp_array->at(i) + runtime_prefix_len; 909 if (!os::same_files(dumptime_path, runtime_path)) { 910 return true; 911 } 912 i++; 913 j++; 914 } 915 return false; 916 } 917 918 bool FileMapInfo::validate_boot_class_paths() { 919 // 920 // - Archive contains boot classes only - relaxed boot path check: 921 // Extra path elements appended to the boot path at runtime are allowed. 922 // 923 // - Archive contains application or platform classes - strict boot path check: 924 // Validate the entire runtime boot path, which must be compatible 925 // with the dump time boot path. Appending boot path at runtime is not 926 // allowed. 927 // 928 929 // The first entry in boot path is the modules_image (guaranteed by 930 // ClassLoader::setup_boot_search_path()). Skip the first entry. The 931 // path of the runtime modules_image may be different from the dump 932 // time path (e.g. the JDK image is copied to a different location 933 // after generating the shared archive), which is acceptable. For most 934 // common cases, the dump time boot path might contain modules_image only. 935 char* runtime_boot_path = Arguments::get_boot_class_path(); 936 char* rp = skip_first_path_entry(runtime_boot_path); 937 assert(shared_path(0)->is_modules_image(), "first shared_path must be the modules image"); 938 int dp_len = header()->app_class_paths_start_index() - 1; // ignore the first path to the module image 939 bool mismatch = false; 940 941 bool relaxed_check = !header()->has_platform_or_app_classes(); 942 if (dp_len == 0 && rp == NULL) { 943 return true; // ok, both runtime and dump time boot paths have modules_images only 944 } else if (dp_len == 0 && rp != NULL) { 945 if (relaxed_check) { 946 return true; // ok, relaxed check, runtime has extra boot append path entries 947 } else { 948 ResourceMark rm; 949 if (check_paths_existence(rp)) { 950 // If a path exists in the runtime boot paths, it is considered a mismatch 951 // since there's no boot path specified during dump time. 952 mismatch = true; 953 } 954 } 955 } else if (dp_len > 0 && rp != NULL) { 956 int num; 957 ResourceMark rm; 958 GrowableArray<const char*>* rp_array = create_path_array(rp); 959 int rp_len = rp_array->length(); 960 if (rp_len >= dp_len) { 961 if (relaxed_check) { 962 // only check the leading entries in the runtime boot path, up to 963 // the length of the dump time boot path 964 num = dp_len; 965 } else { 966 // check the full runtime boot path, must match with dump time 967 num = rp_len; 968 } 969 mismatch = check_paths(1, num, rp_array, 0, 0); 970 } else { 971 // create_path_array() ignores non-existing paths. Although the dump time and runtime boot classpath lengths 972 // are the same initially, after the call to create_path_array(), the runtime boot classpath length could become 973 // shorter. We consider boot classpath mismatch in this case. 974 mismatch = true; 975 } 976 } 977 978 if (mismatch) { 979 // The paths are different 980 return classpath_failure("[BOOT classpath mismatch, actual =", runtime_boot_path); 981 } 982 return true; 983 } 984 985 bool FileMapInfo::validate_app_class_paths(int shared_app_paths_len) { 986 const char *appcp = Arguments::get_appclasspath(); 987 assert(appcp != NULL, "NULL app classpath"); 988 int rp_len = num_paths(appcp); 989 bool mismatch = false; 990 if (rp_len < shared_app_paths_len) { 991 return classpath_failure("Run time APP classpath is shorter than the one at dump time: ", appcp); 992 } 993 if (shared_app_paths_len != 0 && rp_len != 0) { 994 // Prefix is OK: E.g., dump with -cp foo.jar, but run with -cp foo.jar:bar.jar. 995 ResourceMark rm; 996 GrowableArray<const char*>* rp_array = create_path_array(appcp); 997 if (rp_array->length() == 0) { 998 // None of the jar file specified in the runtime -cp exists. 999 return classpath_failure("None of the jar file specified in the runtime -cp exists: -Djava.class.path=", appcp); 1000 } 1001 if (rp_array->length() < shared_app_paths_len) { 1002 // create_path_array() ignores non-existing paths. Although the dump time and runtime app classpath lengths 1003 // are the same initially, after the call to create_path_array(), the runtime app classpath length could become 1004 // shorter. We consider app classpath mismatch in this case. 1005 return classpath_failure("[APP classpath mismatch, actual: -Djava.class.path=", appcp); 1006 } 1007 1008 // Handling of non-existent entries in the classpath: we eliminate all the non-existent 1009 // entries from both the dump time classpath (ClassLoader::update_class_path_entry_list) 1010 // and the runtime classpath (FileMapInfo::create_path_array), and check the remaining 1011 // entries. E.g.: 1012 // 1013 // dump : -cp a.jar:NE1:NE2:b.jar -> a.jar:b.jar -> recorded in archive. 1014 // run 1: -cp NE3:a.jar:NE4:b.jar -> a.jar:b.jar -> matched 1015 // run 2: -cp x.jar:NE4:b.jar -> x.jar:b.jar -> mismatched 1016 1017 int j = header()->app_class_paths_start_index(); 1018 mismatch = check_paths(j, shared_app_paths_len, rp_array, 0, 0); 1019 if (mismatch) { 1020 // To facilitate app deployment, we allow the JAR files to be moved *together* to 1021 // a different location, as long as they are still stored under the same directory 1022 // structure. E.g., the following is OK. 1023 // java -Xshare:dump -cp /a/Foo.jar:/a/b/Bar.jar ... 1024 // java -Xshare:auto -cp /x/y/Foo.jar:/x/y/b/Bar.jar ... 1025 unsigned int dumptime_prefix_len = header()->common_app_classpath_prefix_size(); 1026 unsigned int runtime_prefix_len = longest_common_app_classpath_prefix_len(shared_app_paths_len, rp_array); 1027 if (dumptime_prefix_len != 0 || runtime_prefix_len != 0) { 1028 log_info(class, path)("LCP length for app classpath (dumptime: %u, runtime: %u)", 1029 dumptime_prefix_len, runtime_prefix_len); 1030 mismatch = check_paths(j, shared_app_paths_len, rp_array, 1031 dumptime_prefix_len, runtime_prefix_len); 1032 } 1033 if (mismatch) { 1034 return classpath_failure("[APP classpath mismatch, actual: -Djava.class.path=", appcp); 1035 } 1036 } 1037 } 1038 return true; 1039 } 1040 1041 void FileMapInfo::log_paths(const char* msg, int start_idx, int end_idx) { 1042 LogTarget(Info, class, path) lt; 1043 if (lt.is_enabled()) { 1044 LogStream ls(lt); 1045 ls.print("%s", msg); 1046 const char* prefix = ""; 1047 for (int i = start_idx; i < end_idx; i++) { 1048 ls.print("%s%s", prefix, shared_path(i)->name()); 1049 prefix = os::path_separator(); 1050 } 1051 ls.cr(); 1052 } 1053 } 1054 1055 bool FileMapInfo::check_module_paths() { 1056 const char* rp = Arguments::get_property("jdk.module.path"); 1057 int num_paths = Arguments::num_archives(rp); 1058 if (num_paths != header()->num_module_paths()) { 1059 return false; 1060 } 1061 ResourceMark rm; 1062 GrowableArray<const char*>* rp_array = create_path_array(rp); 1063 return check_paths(header()->app_module_paths_start_index(), num_paths, rp_array, 0, 0); 1064 } 1065 1066 bool FileMapInfo::validate_shared_path_table() { 1067 assert(UseSharedSpaces, "runtime only"); 1068 1069 _validating_shared_path_table = true; 1070 1071 // Load the shared path table info from the archive header 1072 _shared_path_table = header()->shared_path_table(); 1073 if (DynamicDumpSharedSpaces) { 1074 // Only support dynamic dumping with the usage of the default CDS archive 1075 // or a simple base archive. 1076 // If the base layer archive contains additional path component besides 1077 // the runtime image and the -cp, dynamic dumping is disabled. 1078 // 1079 // When dynamic archiving is enabled, the _shared_path_table is overwritten 1080 // to include the application path and stored in the top layer archive. 1081 assert(shared_path(0)->is_modules_image(), "first shared_path must be the modules image"); 1082 if (header()->app_class_paths_start_index() > 1) { 1083 DynamicDumpSharedSpaces = false; 1084 warning( 1085 "Dynamic archiving is disabled because base layer archive has appended boot classpath"); 1086 } 1087 if (header()->num_module_paths() > 0) { 1088 if (!check_module_paths()) { 1089 DynamicDumpSharedSpaces = false; 1090 warning( 1091 "Dynamic archiving is disabled because base layer archive has a different module path"); 1092 } 1093 } 1094 } 1095 1096 log_paths("Expecting BOOT path=", 0, header()->app_class_paths_start_index()); 1097 log_paths("Expecting -Djava.class.path=", header()->app_class_paths_start_index(), header()->app_module_paths_start_index()); 1098 1099 int module_paths_start_index = header()->app_module_paths_start_index(); 1100 int shared_app_paths_len = 0; 1101 1102 // validate the path entries up to the _max_used_path_index 1103 for (int i=0; i < header()->max_used_path_index() + 1; i++) { 1104 if (i < module_paths_start_index) { 1105 if (shared_path(i)->validate()) { 1106 // Only count the app class paths not from the "Class-path" attribute of a jar manifest. 1107 if (!shared_path(i)->from_class_path_attr() && i >= header()->app_class_paths_start_index()) { 1108 shared_app_paths_len++; 1109 } 1110 log_info(class, path)("ok"); 1111 } else { 1112 if (_dynamic_archive_info != NULL && _dynamic_archive_info->_is_static) { 1113 assert(!UseSharedSpaces, "UseSharedSpaces should be disabled"); 1114 } 1115 return false; 1116 } 1117 } else if (i >= module_paths_start_index) { 1118 if (shared_path(i)->validate(false /* not a class path entry */)) { 1119 log_info(class, path)("ok"); 1120 } else { 1121 if (_dynamic_archive_info != NULL && _dynamic_archive_info->_is_static) { 1122 assert(!UseSharedSpaces, "UseSharedSpaces should be disabled"); 1123 } 1124 return false; 1125 } 1126 } 1127 } 1128 1129 if (header()->max_used_path_index() == 0) { 1130 // default archive only contains the module image in the bootclasspath 1131 assert(shared_path(0)->is_modules_image(), "first shared_path must be the modules image"); 1132 } else { 1133 if (!validate_boot_class_paths() || !validate_app_class_paths(shared_app_paths_len)) { 1134 const char* mismatch_msg = "shared class paths mismatch"; 1135 const char* hint_msg = log_is_enabled(Info, class, path) ? 1136 "" : " (hint: enable -Xlog:class+path=info to diagnose the failure)"; 1137 fail_continue(LogLevel::Warning, "%s%s", mismatch_msg, hint_msg); 1138 return false; 1139 } 1140 } 1141 1142 validate_non_existent_class_paths(); 1143 1144 _validating_shared_path_table = false; 1145 1146 #if INCLUDE_JVMTI 1147 if (_classpath_entries_for_jvmti != NULL) { 1148 os::free(_classpath_entries_for_jvmti); 1149 } 1150 size_t sz = sizeof(ClassPathEntry*) * get_number_of_shared_paths(); 1151 _classpath_entries_for_jvmti = (ClassPathEntry**)os::malloc(sz, mtClass); 1152 memset((void*)_classpath_entries_for_jvmti, 0, sz); 1153 #endif 1154 1155 return true; 1156 } 1157 1158 void FileMapInfo::validate_non_existent_class_paths() { 1159 // All of the recorded non-existent paths came from the Class-Path: attribute from the JAR 1160 // files on the app classpath. If any of these are found to exist during runtime, 1161 // it will change how classes are loading for the app loader. For safety, disable 1162 // loading of archived platform/app classes (currently there's no way to disable just the 1163 // app classes). 1164 1165 assert(UseSharedSpaces, "runtime only"); 1166 for (int i = header()->app_module_paths_start_index() + header()->num_module_paths(); 1167 i < get_number_of_shared_paths(); 1168 i++) { 1169 SharedClassPathEntry* ent = shared_path(i); 1170 if (!ent->check_non_existent()) { 1171 warning("Archived non-system classes are disabled because the " 1172 "file %s exists", ent->name()); 1173 header()->set_has_platform_or_app_classes(false); 1174 } 1175 } 1176 } 1177 1178 // A utility class for reading/validating the GenericCDSFileMapHeader portion of 1179 // a CDS archive's header. The file header of all CDS archives with versions from 1180 // CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION (12) are guaranteed to always start 1181 // with GenericCDSFileMapHeader. This makes it possible to read important information 1182 // from a CDS archive created by a different version of HotSpot, so that we can 1183 // automatically regenerate the archive as necessary (JDK-8261455). 1184 class FileHeaderHelper { 1185 int _fd; 1186 bool _is_valid; 1187 bool _is_static; 1188 GenericCDSFileMapHeader* _header; 1189 const char* _archive_name; 1190 const char* _base_archive_name; 1191 1192 public: 1193 FileHeaderHelper(const char* archive_name, bool is_static) { 1194 _fd = -1; 1195 _is_valid = false; 1196 _header = nullptr; 1197 _base_archive_name = nullptr; 1198 _archive_name = archive_name; 1199 _is_static = is_static; 1200 } 1201 1202 ~FileHeaderHelper() { 1203 if (_header != nullptr) { 1204 FREE_C_HEAP_ARRAY(char, _header); 1205 } 1206 if (_fd != -1) { 1207 ::close(_fd); 1208 } 1209 } 1210 1211 bool initialize() { 1212 assert(_archive_name != nullptr, "Archive name is NULL"); 1213 _fd = os::open(_archive_name, O_RDONLY | O_BINARY, 0); 1214 if (_fd < 0) { 1215 FileMapInfo::fail_continue("Specified shared archive not found (%s)", _archive_name); 1216 return false; 1217 } 1218 return initialize(_fd); 1219 } 1220 1221 // for an already opened file, do not set _fd 1222 bool initialize(int fd) { 1223 assert(_archive_name != nullptr, "Archive name is NULL"); 1224 assert(fd != -1, "Archive must be opened already"); 1225 // First read the generic header so we know the exact size of the actual header. 1226 GenericCDSFileMapHeader gen_header; 1227 size_t size = sizeof(GenericCDSFileMapHeader); 1228 os::lseek(fd, 0, SEEK_SET); 1229 size_t n = ::read(fd, (void*)&gen_header, (unsigned int)size); 1230 if (n != size) { 1231 FileMapInfo::fail_continue("Unable to read generic CDS file map header from shared archive"); 1232 return false; 1233 } 1234 1235 if (gen_header._magic != CDS_ARCHIVE_MAGIC && 1236 gen_header._magic != CDS_DYNAMIC_ARCHIVE_MAGIC) { 1237 FileMapInfo::fail_continue("The shared archive file has a bad magic number: %#x", gen_header._magic); 1238 return false; 1239 } 1240 1241 if (gen_header._version < CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION) { 1242 FileMapInfo::fail_continue("Cannot handle shared archive file version 0x%x. Must be at least 0x%x.", 1243 gen_header._version, CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION); 1244 return false; 1245 } 1246 1247 if (gen_header._version != CURRENT_CDS_ARCHIVE_VERSION) { 1248 FileMapInfo::fail_continue("The shared archive file version 0x%x does not match the required version 0x%x.", 1249 gen_header._version, CURRENT_CDS_ARCHIVE_VERSION); 1250 } 1251 1252 size_t filelen = os::lseek(fd, 0, SEEK_END); 1253 if (gen_header._header_size >= filelen) { 1254 FileMapInfo::fail_continue("Archive file header larger than archive file"); 1255 return false; 1256 } 1257 1258 // Read the actual header and perform more checks 1259 size = gen_header._header_size; 1260 _header = (GenericCDSFileMapHeader*)NEW_C_HEAP_ARRAY(char, size, mtInternal); 1261 os::lseek(fd, 0, SEEK_SET); 1262 n = ::read(fd, (void*)_header, (unsigned int)size); 1263 if (n != size) { 1264 FileMapInfo::fail_continue("Unable to read actual CDS file map header from shared archive"); 1265 return false; 1266 } 1267 1268 if (!check_crc()) { 1269 return false; 1270 } 1271 1272 if (!check_and_init_base_archive_name()) { 1273 return false; 1274 } 1275 1276 // All fields in the GenericCDSFileMapHeader has been validated. 1277 _is_valid = true; 1278 return true; 1279 } 1280 1281 GenericCDSFileMapHeader* get_generic_file_header() { 1282 assert(_header != nullptr && _is_valid, "must be a valid archive file"); 1283 return _header; 1284 } 1285 1286 const char* base_archive_name() { 1287 assert(_header != nullptr && _is_valid, "must be a valid archive file"); 1288 return _base_archive_name; 1289 } 1290 1291 private: 1292 bool check_crc() { 1293 if (VerifySharedSpaces) { 1294 FileMapHeader* header = (FileMapHeader*)_header; 1295 int actual_crc = header->compute_crc(); 1296 if (actual_crc != header->crc()) { 1297 log_info(cds)("_crc expected: %d", header->crc()); 1298 log_info(cds)(" actual: %d", actual_crc); 1299 FileMapInfo::fail_continue("Header checksum verification failed."); 1300 return false; 1301 } 1302 } 1303 return true; 1304 } 1305 1306 bool check_and_init_base_archive_name() { 1307 unsigned int name_offset = _header->_base_archive_name_offset; 1308 unsigned int name_size = _header->_base_archive_name_size; 1309 unsigned int header_size = _header->_header_size; 1310 1311 if (name_offset + name_size < name_offset) { 1312 FileMapInfo::fail_continue("base_archive_name offset/size overflow: " UINT32_FORMAT "/" UINT32_FORMAT, 1313 name_offset, name_size); 1314 return false; 1315 } 1316 if (_header->_magic == CDS_ARCHIVE_MAGIC) { 1317 if (name_offset != 0) { 1318 FileMapInfo::fail_continue("static shared archive must have zero _base_archive_name_offset"); 1319 return false; 1320 } 1321 if (name_size != 0) { 1322 FileMapInfo::fail_continue("static shared archive must have zero _base_archive_name_size"); 1323 return false; 1324 } 1325 } else { 1326 assert(_header->_magic == CDS_DYNAMIC_ARCHIVE_MAGIC, "must be"); 1327 if ((name_size == 0 && name_offset != 0) || 1328 (name_size != 0 && name_offset == 0)) { 1329 // If either is zero, both must be zero. This indicates that we are using the default base archive. 1330 FileMapInfo::fail_continue("Invalid base_archive_name offset/size: " UINT32_FORMAT "/" UINT32_FORMAT, 1331 name_offset, name_size); 1332 return false; 1333 } 1334 if (name_size > 0) { 1335 if (name_offset + name_size > header_size) { 1336 FileMapInfo::fail_continue("Invalid base_archive_name offset/size (out of range): " 1337 UINT32_FORMAT " + " UINT32_FORMAT " > " UINT32_FORMAT , 1338 name_offset, name_size, header_size); 1339 return false; 1340 } 1341 const char* name = ((const char*)_header) + _header->_base_archive_name_offset; 1342 if (name[name_size - 1] != '\0' || strlen(name) != name_size - 1) { 1343 FileMapInfo::fail_continue("Base archive name is damaged"); 1344 return false; 1345 } 1346 if (!os::file_exists(name)) { 1347 FileMapInfo::fail_continue("Base archive %s does not exist", name); 1348 return false; 1349 } 1350 _base_archive_name = name; 1351 } 1352 } 1353 1354 return true; 1355 } 1356 }; 1357 1358 // Return value: 1359 // false: 1360 // <archive_name> is not a valid archive. *base_archive_name is set to null. 1361 // true && (*base_archive_name) == NULL: 1362 // <archive_name> is a valid static archive. 1363 // true && (*base_archive_name) != NULL: 1364 // <archive_name> is a valid dynamic archive. 1365 bool FileMapInfo::get_base_archive_name_from_header(const char* archive_name, 1366 char** base_archive_name) { 1367 FileHeaderHelper file_helper(archive_name, false); 1368 *base_archive_name = NULL; 1369 1370 if (!file_helper.initialize()) { 1371 return false; 1372 } 1373 GenericCDSFileMapHeader* header = file_helper.get_generic_file_header(); 1374 if (header->_magic != CDS_DYNAMIC_ARCHIVE_MAGIC) { 1375 assert(header->_magic == CDS_ARCHIVE_MAGIC, "must be"); 1376 if (AutoCreateSharedArchive) { 1377 log_warning(cds)("AutoCreateSharedArchive is ignored because %s is a static archive", archive_name); 1378 } 1379 return true; 1380 } 1381 1382 const char* base = file_helper.base_archive_name(); 1383 if (base == nullptr) { 1384 *base_archive_name = Arguments::get_default_shared_archive_path(); 1385 } else { 1386 *base_archive_name = os::strdup_check_oom(base); 1387 } 1388 1389 return true; 1390 } 1391 1392 // Read the FileMapInfo information from the file. 1393 1394 bool FileMapInfo::init_from_file(int fd) { 1395 FileHeaderHelper file_helper(_full_path, _is_static); 1396 if (!file_helper.initialize(fd)) { 1397 fail_continue("Unable to read the file header."); 1398 return false; 1399 } 1400 GenericCDSFileMapHeader* gen_header = file_helper.get_generic_file_header(); 1401 1402 if (_is_static) { 1403 if (gen_header->_magic != CDS_ARCHIVE_MAGIC) { 1404 FileMapInfo::fail_continue("Not a base shared archive: %s", _full_path); 1405 return false; 1406 } 1407 } else { 1408 if (gen_header->_magic != CDS_DYNAMIC_ARCHIVE_MAGIC) { 1409 FileMapInfo::fail_continue("Not a top shared archive: %s", _full_path); 1410 return false; 1411 } 1412 } 1413 1414 _header = (FileMapHeader*)os::malloc(gen_header->_header_size, mtInternal); 1415 os::lseek(fd, 0, SEEK_SET); // reset to begin of the archive 1416 size_t size = gen_header->_header_size; 1417 size_t n = ::read(fd, (void*)_header, (unsigned int)size); 1418 if (n != size) { 1419 fail_continue("Failed to read file header from the top archive file\n"); 1420 return false; 1421 } 1422 1423 if (header()->version() != CURRENT_CDS_ARCHIVE_VERSION) { 1424 log_info(cds)("_version expected: 0x%x", CURRENT_CDS_ARCHIVE_VERSION); 1425 log_info(cds)(" actual: 0x%x", header()->version()); 1426 fail_continue("The shared archive file has the wrong version."); 1427 return false; 1428 } 1429 1430 int common_path_size = header()->common_app_classpath_prefix_size(); 1431 if (common_path_size < 0) { 1432 FileMapInfo::fail_continue("common app classpath prefix len < 0"); 1433 return false; 1434 } 1435 1436 unsigned int base_offset = header()->base_archive_name_offset(); 1437 unsigned int name_size = header()->base_archive_name_size(); 1438 unsigned int header_size = header()->header_size(); 1439 if (base_offset != 0 && name_size != 0) { 1440 if (header_size != base_offset + name_size) { 1441 log_info(cds)("_header_size: " UINT32_FORMAT, header_size); 1442 log_info(cds)("common_app_classpath_size: " UINT32_FORMAT, header()->common_app_classpath_prefix_size()); 1443 log_info(cds)("base_archive_name_size: " UINT32_FORMAT, header()->base_archive_name_size()); 1444 log_info(cds)("base_archive_name_offset: " UINT32_FORMAT, header()->base_archive_name_offset()); 1445 FileMapInfo::fail_continue("The shared archive file has an incorrect header size."); 1446 return false; 1447 } 1448 } 1449 1450 const char* actual_ident = header()->jvm_ident(); 1451 1452 if (actual_ident[JVM_IDENT_MAX-1] != 0) { 1453 FileMapInfo::fail_continue("JVM version identifier is corrupted."); 1454 return false; 1455 } 1456 1457 char expected_ident[JVM_IDENT_MAX]; 1458 get_header_version(expected_ident); 1459 if (strncmp(actual_ident, expected_ident, JVM_IDENT_MAX-1) != 0) { 1460 log_info(cds)("_jvm_ident expected: %s", expected_ident); 1461 log_info(cds)(" actual: %s", actual_ident); 1462 FileMapInfo::fail_continue("The shared archive file was created by a different" 1463 " version or build of HotSpot"); 1464 return false; 1465 } 1466 1467 _file_offset = header()->header_size(); // accounts for the size of _base_archive_name 1468 1469 size_t len = os::lseek(fd, 0, SEEK_END); 1470 1471 for (int i = 0; i <= MetaspaceShared::last_valid_region; i++) { 1472 FileMapRegion* r = region_at(i); 1473 if (r->file_offset() > len || len - r->file_offset() < r->used()) { 1474 fail_continue("The shared archive file has been truncated."); 1475 return false; 1476 } 1477 } 1478 1479 return true; 1480 } 1481 1482 void FileMapInfo::seek_to_position(size_t pos) { 1483 if (os::lseek(_fd, (long)pos, SEEK_SET) < 0) { 1484 fail_stop("Unable to seek to position " SIZE_FORMAT, pos); 1485 } 1486 } 1487 1488 // Read the FileMapInfo information from the file. 1489 bool FileMapInfo::open_for_read() { 1490 if (_file_open) { 1491 return true; 1492 } 1493 log_info(cds)("trying to map %s", _full_path); 1494 int fd = os::open(_full_path, O_RDONLY | O_BINARY, 0); 1495 if (fd < 0) { 1496 if (errno == ENOENT) { 1497 fail_continue("Specified shared archive not found (%s)", _full_path); 1498 } else { 1499 fail_continue("Failed to open shared archive file (%s)", 1500 os::strerror(errno)); 1501 } 1502 return false; 1503 } else { 1504 log_info(cds)("Opened archive %s.", _full_path); 1505 } 1506 1507 _fd = fd; 1508 _file_open = true; 1509 return true; 1510 } 1511 1512 // Write the FileMapInfo information to the file. 1513 1514 void FileMapInfo::open_for_write() { 1515 LogMessage(cds) msg; 1516 if (msg.is_info()) { 1517 msg.info("Dumping shared data to file: "); 1518 msg.info(" %s", _full_path); 1519 } 1520 1521 #ifdef _WINDOWS // On Windows, need WRITE permission to remove the file. 1522 chmod(_full_path, _S_IREAD | _S_IWRITE); 1523 #endif 1524 1525 // Use remove() to delete the existing file because, on Unix, this will 1526 // allow processes that have it open continued access to the file. 1527 remove(_full_path); 1528 int fd = os::open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0444); 1529 if (fd < 0) { 1530 fail_stop("Unable to create shared archive file %s: (%s).", _full_path, 1531 os::strerror(errno)); 1532 } 1533 _fd = fd; 1534 _file_open = true; 1535 1536 // Seek past the header. We will write the header after all regions are written 1537 // and their CRCs computed. 1538 size_t header_bytes = header()->header_size(); 1539 1540 header_bytes = align_up(header_bytes, MetaspaceShared::core_region_alignment()); 1541 _file_offset = header_bytes; 1542 seek_to_position(_file_offset); 1543 } 1544 1545 // Write the header to the file, seek to the next allocation boundary. 1546 1547 void FileMapInfo::write_header() { 1548 _file_offset = 0; 1549 seek_to_position(_file_offset); 1550 assert(is_file_position_aligned(), "must be"); 1551 write_bytes(header(), header()->header_size()); 1552 } 1553 1554 size_t FileMapRegion::used_aligned() const { 1555 return align_up(used(), MetaspaceShared::core_region_alignment()); 1556 } 1557 1558 void FileMapRegion::init(int region_index, size_t mapping_offset, size_t size, bool read_only, 1559 bool allow_exec, int crc) { 1560 _is_heap_region = HeapShared::is_heap_region(region_index); 1561 _is_bitmap_region = (region_index == MetaspaceShared::bm); 1562 _mapping_offset = mapping_offset; 1563 _used = size; 1564 _read_only = read_only; 1565 _allow_exec = allow_exec; 1566 _crc = crc; 1567 _mapped_from_file = false; 1568 _mapped_base = NULL; 1569 } 1570 1571 void FileMapRegion::init_bitmaps(ArchiveHeapBitmapInfo oopmap, ArchiveHeapBitmapInfo ptrmap) { 1572 _oopmap_offset = oopmap._bm_region_offset; 1573 _oopmap_size_in_bits = oopmap._size_in_bits; 1574 1575 _ptrmap_offset = ptrmap._bm_region_offset; 1576 _ptrmap_size_in_bits = ptrmap._size_in_bits; 1577 } 1578 1579 BitMapView FileMapRegion::bitmap_view(bool is_oopmap) { 1580 char* bitmap_base = FileMapInfo::current_info()->map_bitmap_region(); 1581 bitmap_base += is_oopmap ? _oopmap_offset : _ptrmap_offset; 1582 size_t size_in_bits = is_oopmap ? _oopmap_size_in_bits : _ptrmap_size_in_bits; 1583 return BitMapView((BitMap::bm_word_t*)(bitmap_base), size_in_bits); 1584 } 1585 1586 BitMapView FileMapRegion::oopmap_view() { 1587 return bitmap_view(true); 1588 } 1589 1590 BitMapView FileMapRegion::ptrmap_view() { 1591 assert(has_ptrmap(), "must be"); 1592 return bitmap_view(false); 1593 } 1594 1595 static const char* region_name(int region_index) { 1596 static const char* names[] = { 1597 "rw", "ro", "bm", "ca0", "ca1", "oa0", "oa1" 1598 }; 1599 const int num_regions = sizeof(names)/sizeof(names[0]); 1600 assert(0 <= region_index && region_index < num_regions, "sanity"); 1601 1602 return names[region_index]; 1603 } 1604 1605 void FileMapRegion::print(outputStream* st, int region_index) { 1606 st->print_cr("============ region ============= %d \"%s\"", region_index, region_name(region_index)); 1607 st->print_cr("- crc: 0x%08x", _crc); 1608 st->print_cr("- read_only: %d", _read_only); 1609 st->print_cr("- allow_exec: %d", _allow_exec); 1610 st->print_cr("- is_heap_region: %d", _is_heap_region); 1611 st->print_cr("- is_bitmap_region: %d", _is_bitmap_region); 1612 st->print_cr("- mapped_from_file: %d", _mapped_from_file); 1613 st->print_cr("- file_offset: " SIZE_FORMAT_X, _file_offset); 1614 st->print_cr("- mapping_offset: " SIZE_FORMAT_X, _mapping_offset); 1615 st->print_cr("- used: " SIZE_FORMAT, _used); 1616 st->print_cr("- oopmap_offset: " SIZE_FORMAT_X, _oopmap_offset); 1617 st->print_cr("- oopmap_size_in_bits: " SIZE_FORMAT, _oopmap_size_in_bits); 1618 st->print_cr("- mapped_base: " INTPTR_FORMAT, p2i(_mapped_base)); 1619 } 1620 1621 void FileMapInfo::write_region(int region, char* base, size_t size, 1622 bool read_only, bool allow_exec) { 1623 Arguments::assert_is_dumping_archive(); 1624 1625 FileMapRegion* r = region_at(region); 1626 char* requested_base; 1627 size_t mapping_offset = 0; 1628 1629 if (region == MetaspaceShared::bm) { 1630 requested_base = NULL; // always NULL for bm region 1631 } else if (size == 0) { 1632 // This is an unused region (e.g., a heap region when !INCLUDE_CDS_JAVA_HEAP) 1633 requested_base = NULL; 1634 } else if (HeapShared::is_heap_region(region)) { 1635 assert(!DynamicDumpSharedSpaces, "must be"); 1636 requested_base = base; 1637 if (UseCompressedOops) { 1638 mapping_offset = (size_t)((address)base - CompressedOops::base()); 1639 assert((mapping_offset >> CompressedOops::shift()) << CompressedOops::shift() == mapping_offset, "must be"); 1640 } else { 1641 #if INCLUDE_G1GC 1642 mapping_offset = requested_base - (char*)G1CollectedHeap::heap()->reserved().start(); 1643 #endif 1644 } 1645 } else { 1646 char* requested_SharedBaseAddress = (char*)MetaspaceShared::requested_base_address(); 1647 requested_base = ArchiveBuilder::current()->to_requested(base); 1648 assert(requested_base >= requested_SharedBaseAddress, "must be"); 1649 mapping_offset = requested_base - requested_SharedBaseAddress; 1650 } 1651 1652 r->set_file_offset(_file_offset); 1653 int crc = ClassLoader::crc32(0, base, (jint)size); 1654 if (size > 0) { 1655 log_info(cds)("Shared file region (%-3s) %d: " SIZE_FORMAT_W(8) 1656 " bytes, addr " INTPTR_FORMAT " file offset 0x%08" PRIxPTR 1657 " crc 0x%08x", 1658 region_name(region), region, size, p2i(requested_base), _file_offset, crc); 1659 } 1660 1661 r->init(region, mapping_offset, size, read_only, allow_exec, crc); 1662 1663 if (base != NULL) { 1664 write_bytes_aligned(base, size); 1665 } 1666 } 1667 1668 size_t FileMapInfo::set_bitmaps_offset(GrowableArray<ArchiveHeapBitmapInfo>* bitmaps, size_t curr_size) { 1669 for (int i = 0; i < bitmaps->length(); i++) { 1670 bitmaps->at(i)._bm_region_offset = curr_size; 1671 curr_size += bitmaps->at(i)._size_in_bytes; 1672 } 1673 return curr_size; 1674 } 1675 1676 size_t FileMapInfo::write_bitmaps(GrowableArray<ArchiveHeapBitmapInfo>* bitmaps, size_t curr_offset, char* buffer) { 1677 for (int i = 0; i < bitmaps->length(); i++) { 1678 memcpy(buffer + curr_offset, bitmaps->at(i)._map, bitmaps->at(i)._size_in_bytes); 1679 curr_offset += bitmaps->at(i)._size_in_bytes; 1680 } 1681 return curr_offset; 1682 } 1683 1684 char* FileMapInfo::write_bitmap_region(const CHeapBitMap* ptrmap, 1685 GrowableArray<ArchiveHeapBitmapInfo>* closed_bitmaps, 1686 GrowableArray<ArchiveHeapBitmapInfo>* open_bitmaps, 1687 size_t &size_in_bytes) { 1688 size_t size_in_bits = ptrmap->size(); 1689 size_in_bytes = ptrmap->size_in_bytes(); 1690 1691 if (closed_bitmaps != NULL && open_bitmaps != NULL) { 1692 size_in_bytes = set_bitmaps_offset(closed_bitmaps, size_in_bytes); 1693 size_in_bytes = set_bitmaps_offset(open_bitmaps, size_in_bytes); 1694 } 1695 1696 char* buffer = NEW_C_HEAP_ARRAY(char, size_in_bytes, mtClassShared); 1697 ptrmap->write_to((BitMap::bm_word_t*)buffer, ptrmap->size_in_bytes()); 1698 header()->set_ptrmap_size_in_bits(size_in_bits); 1699 1700 if (closed_bitmaps != NULL && open_bitmaps != NULL) { 1701 size_t curr_offset = write_bitmaps(closed_bitmaps, ptrmap->size_in_bytes(), buffer); 1702 write_bitmaps(open_bitmaps, curr_offset, buffer); 1703 } 1704 1705 write_region(MetaspaceShared::bm, (char*)buffer, size_in_bytes, /*read_only=*/true, /*allow_exec=*/false); 1706 return buffer; 1707 } 1708 1709 // Write out the given archive heap memory regions. GC code combines multiple 1710 // consecutive archive GC regions into one MemRegion whenever possible and 1711 // produces the 'regions' array. 1712 // 1713 // If the archive heap memory size is smaller than a single dump time GC region 1714 // size, there is only one MemRegion in the array. 1715 // 1716 // If the archive heap memory size is bigger than one dump time GC region size, 1717 // the 'regions' array may contain more than one consolidated MemRegions. When 1718 // the first/bottom archive GC region is a partial GC region (with the empty 1719 // portion at the higher address within the region), one MemRegion is used for 1720 // the bottom partial archive GC region. The rest of the consecutive archive 1721 // GC regions are combined into another MemRegion. 1722 // 1723 // Here's the mapping from (archive heap GC regions) -> (GrowableArray<MemRegion> *regions). 1724 // + We have 1 or more archive heap regions: ah0, ah1, ah2 ..... ahn 1725 // + We have 1 or 2 consolidated heap memory regions: r0 and r1 1726 // 1727 // If there's a single archive GC region (ah0), then r0 == ah0, and r1 is empty. 1728 // Otherwise: 1729 // 1730 // "X" represented space that's occupied by heap objects. 1731 // "_" represented unused spaced in the heap region. 1732 // 1733 // 1734 // |ah0 | ah1 | ah2| ...... | ahn| 1735 // |XXXXXX|__ |XXXXX|XXXX|XXXXXXXX|XXXX| 1736 // |<-r0->| |<- r1 ----------------->| 1737 // ^^^ 1738 // | 1739 // +-- gap 1740 size_t FileMapInfo::write_heap_regions(GrowableArray<MemRegion>* regions, 1741 GrowableArray<ArchiveHeapBitmapInfo>* bitmaps, 1742 int first_region_id, int max_num_regions) { 1743 assert(max_num_regions <= 2, "Only support maximum 2 memory regions"); 1744 1745 int arr_len = regions == NULL ? 0 : regions->length(); 1746 if (arr_len > max_num_regions) { 1747 fail_stop("Unable to write archive heap memory regions: " 1748 "number of memory regions exceeds maximum due to fragmentation. " 1749 "Please increase java heap size " 1750 "(current MaxHeapSize is " SIZE_FORMAT ", InitialHeapSize is " SIZE_FORMAT ").", 1751 MaxHeapSize, InitialHeapSize); 1752 } 1753 1754 size_t total_size = 0; 1755 for (int i = 0; i < max_num_regions; i++) { 1756 char* start = NULL; 1757 size_t size = 0; 1758 if (i < arr_len) { 1759 start = (char*)regions->at(i).start(); 1760 size = regions->at(i).byte_size(); 1761 total_size += size; 1762 } 1763 1764 int region_idx = i + first_region_id; 1765 write_region(region_idx, start, size, false, false); 1766 if (size > 0) { 1767 int oopmap_idx = i * 2; 1768 int ptrmap_idx = i * 2 + 1; 1769 region_at(region_idx)->init_bitmaps(bitmaps->at(oopmap_idx), 1770 bitmaps->at(ptrmap_idx)); 1771 } 1772 } 1773 return total_size; 1774 } 1775 1776 // Dump bytes to file -- at the current file position. 1777 1778 void FileMapInfo::write_bytes(const void* buffer, size_t nbytes) { 1779 assert(_file_open, "must be"); 1780 ssize_t n = os::write(_fd, buffer, (unsigned int)nbytes); 1781 if (n < 0 || (size_t)n != nbytes) { 1782 // If the shared archive is corrupted, close it and remove it. 1783 close(); 1784 remove(_full_path); 1785 fail_stop("Unable to write to shared archive file."); 1786 } 1787 _file_offset += nbytes; 1788 } 1789 1790 bool FileMapInfo::is_file_position_aligned() const { 1791 return _file_offset == align_up(_file_offset, 1792 MetaspaceShared::core_region_alignment()); 1793 } 1794 1795 // Align file position to an allocation unit boundary. 1796 1797 void FileMapInfo::align_file_position() { 1798 assert(_file_open, "must be"); 1799 size_t new_file_offset = align_up(_file_offset, 1800 MetaspaceShared::core_region_alignment()); 1801 if (new_file_offset != _file_offset) { 1802 _file_offset = new_file_offset; 1803 // Seek one byte back from the target and write a byte to insure 1804 // that the written file is the correct length. 1805 _file_offset -= 1; 1806 seek_to_position(_file_offset); 1807 char zero = 0; 1808 write_bytes(&zero, 1); 1809 } 1810 } 1811 1812 1813 // Dump bytes to file -- at the current file position. 1814 1815 void FileMapInfo::write_bytes_aligned(const void* buffer, size_t nbytes) { 1816 align_file_position(); 1817 write_bytes(buffer, nbytes); 1818 align_file_position(); 1819 } 1820 1821 // Close the shared archive file. This does NOT unmap mapped regions. 1822 1823 void FileMapInfo::close() { 1824 if (_file_open) { 1825 if (::close(_fd) < 0) { 1826 fail_stop("Unable to close the shared archive file."); 1827 } 1828 _file_open = false; 1829 _fd = -1; 1830 } 1831 } 1832 1833 1834 // JVM/TI RedefineClasses() support: 1835 // Remap the shared readonly space to shared readwrite, private. 1836 bool FileMapInfo::remap_shared_readonly_as_readwrite() { 1837 int idx = MetaspaceShared::ro; 1838 FileMapRegion* r = region_at(idx); 1839 if (!r->read_only()) { 1840 // the space is already readwrite so we are done 1841 return true; 1842 } 1843 size_t size = r->used_aligned(); 1844 if (!open_for_read()) { 1845 return false; 1846 } 1847 char *addr = region_addr(idx); 1848 char *base = os::remap_memory(_fd, _full_path, r->file_offset(), 1849 addr, size, false /* !read_only */, 1850 r->allow_exec()); 1851 close(); 1852 // These have to be errors because the shared region is now unmapped. 1853 if (base == NULL) { 1854 log_error(cds)("Unable to remap shared readonly space (errno=%d).", errno); 1855 vm_exit(1); 1856 } 1857 if (base != addr) { 1858 log_error(cds)("Unable to remap shared readonly space (errno=%d).", errno); 1859 vm_exit(1); 1860 } 1861 r->set_read_only(false); 1862 return true; 1863 } 1864 1865 // Memory map a region in the address space. 1866 static const char* shared_region_name[] = { "ReadWrite", "ReadOnly", "Bitmap", 1867 "String1", "String2", "OpenArchive1", "OpenArchive2" }; 1868 1869 MapArchiveResult FileMapInfo::map_regions(int regions[], int num_regions, char* mapped_base_address, ReservedSpace rs) { 1870 DEBUG_ONLY(FileMapRegion* last_region = NULL); 1871 intx addr_delta = mapped_base_address - header()->requested_base_address(); 1872 1873 // Make sure we don't attempt to use header()->mapped_base_address() unless 1874 // it's been successfully mapped. 1875 DEBUG_ONLY(header()->set_mapped_base_address((char*)(uintptr_t)0xdeadbeef);) 1876 1877 for (int i = 0; i < num_regions; i++) { 1878 int idx = regions[i]; 1879 MapArchiveResult result = map_region(idx, addr_delta, mapped_base_address, rs); 1880 if (result != MAP_ARCHIVE_SUCCESS) { 1881 return result; 1882 } 1883 FileMapRegion* r = region_at(idx); 1884 DEBUG_ONLY(if (last_region != NULL) { 1885 // Ensure that the OS won't be able to allocate new memory spaces between any mapped 1886 // regions, or else it would mess up the simple comparison in MetaspaceObj::is_shared(). 1887 assert(r->mapped_base() == last_region->mapped_end(), "must have no gaps"); 1888 } 1889 last_region = r;) 1890 log_info(cds)("Mapped %s region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)", is_static() ? "static " : "dynamic", 1891 idx, p2i(r->mapped_base()), p2i(r->mapped_end()), 1892 shared_region_name[idx]); 1893 1894 } 1895 1896 header()->set_mapped_base_address(header()->requested_base_address() + addr_delta); 1897 if (addr_delta != 0 && !relocate_pointers_in_core_regions(addr_delta)) { 1898 return MAP_ARCHIVE_OTHER_FAILURE; 1899 } 1900 1901 return MAP_ARCHIVE_SUCCESS; 1902 } 1903 1904 bool FileMapInfo::read_region(int i, char* base, size_t size, bool do_commit) { 1905 FileMapRegion* r = region_at(i); 1906 if (do_commit) { 1907 log_info(cds)("Commit %s region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)%s", 1908 is_static() ? "static " : "dynamic", i, p2i(base), p2i(base + size), 1909 shared_region_name[i], r->allow_exec() ? " exec" : ""); 1910 if (!os::commit_memory(base, size, r->allow_exec())) { 1911 log_error(cds)("Failed to commit %s region #%d (%s)", is_static() ? "static " : "dynamic", 1912 i, shared_region_name[i]); 1913 return false; 1914 } 1915 } 1916 if (os::lseek(_fd, (long)r->file_offset(), SEEK_SET) != (int)r->file_offset() || 1917 read_bytes(base, size) != size) { 1918 return false; 1919 } 1920 1921 if (VerifySharedSpaces && !region_crc_check(base, r->used(), r->crc())) { 1922 return false; 1923 } 1924 1925 return true; 1926 } 1927 1928 MapArchiveResult FileMapInfo::map_region(int i, intx addr_delta, char* mapped_base_address, ReservedSpace rs) { 1929 assert(!HeapShared::is_heap_region(i), "sanity"); 1930 FileMapRegion* r = region_at(i); 1931 size_t size = r->used_aligned(); 1932 char *requested_addr = mapped_base_address + r->mapping_offset(); 1933 assert(r->mapped_base() == NULL, "must be not mapped yet"); 1934 assert(requested_addr != NULL, "must be specified"); 1935 1936 r->set_mapped_from_file(false); 1937 1938 if (MetaspaceShared::use_windows_memory_mapping()) { 1939 // Windows cannot remap read-only shared memory to read-write when required for 1940 // RedefineClasses, which is also used by JFR. Always map windows regions as RW. 1941 r->set_read_only(false); 1942 } else if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space() || 1943 Arguments::has_jfr_option()) { 1944 // If a tool agent is in use (debugging enabled), or JFR, we must map the address space RW 1945 r->set_read_only(false); 1946 } else if (addr_delta != 0) { 1947 r->set_read_only(false); // Need to patch the pointers 1948 } 1949 1950 if (MetaspaceShared::use_windows_memory_mapping() && rs.is_reserved()) { 1951 // This is the second time we try to map the archive(s). We have already created a ReservedSpace 1952 // that covers all the FileMapRegions to ensure all regions can be mapped. However, Windows 1953 // can't mmap into a ReservedSpace, so we just ::read() the data. We're going to patch all the 1954 // regions anyway, so there's no benefit for mmap anyway. 1955 if (!read_region(i, requested_addr, size, /* do_commit = */ true)) { 1956 log_info(cds)("Failed to read %s shared space into reserved space at " INTPTR_FORMAT, 1957 shared_region_name[i], p2i(requested_addr)); 1958 return MAP_ARCHIVE_OTHER_FAILURE; // oom or I/O error. 1959 } 1960 } else { 1961 // Note that this may either be a "fresh" mapping into unreserved address 1962 // space (Windows, first mapping attempt), or a mapping into pre-reserved 1963 // space (Posix). See also comment in MetaspaceShared::map_archives(). 1964 char* base = os::map_memory(_fd, _full_path, r->file_offset(), 1965 requested_addr, size, r->read_only(), 1966 r->allow_exec(), mtClassShared); 1967 if (base != requested_addr) { 1968 log_info(cds)("Unable to map %s shared space at " INTPTR_FORMAT, 1969 shared_region_name[i], p2i(requested_addr)); 1970 _memory_mapping_failed = true; 1971 return MAP_ARCHIVE_MMAP_FAILURE; 1972 } 1973 r->set_mapped_from_file(true); 1974 } 1975 r->set_mapped_base(requested_addr); 1976 1977 if (VerifySharedSpaces && !verify_region_checksum(i)) { 1978 return MAP_ARCHIVE_OTHER_FAILURE; 1979 } 1980 1981 return MAP_ARCHIVE_SUCCESS; 1982 } 1983 1984 // The return value is the location of the archive relocation bitmap. 1985 char* FileMapInfo::map_bitmap_region() { 1986 FileMapRegion* r = region_at(MetaspaceShared::bm); 1987 if (r->mapped_base() != NULL) { 1988 return r->mapped_base(); 1989 } 1990 bool read_only = true, allow_exec = false; 1991 char* requested_addr = NULL; // allow OS to pick any location 1992 char* bitmap_base = os::map_memory(_fd, _full_path, r->file_offset(), 1993 requested_addr, r->used_aligned(), read_only, allow_exec, mtClassShared); 1994 if (bitmap_base == NULL) { 1995 log_info(cds)("failed to map relocation bitmap"); 1996 return NULL; 1997 } 1998 1999 if (VerifySharedSpaces && !region_crc_check(bitmap_base, r->used(), r->crc())) { 2000 log_error(cds)("relocation bitmap CRC error"); 2001 if (!os::unmap_memory(bitmap_base, r->used_aligned())) { 2002 fatal("os::unmap_memory of relocation bitmap failed"); 2003 } 2004 return NULL; 2005 } 2006 2007 r->set_mapped_base(bitmap_base); 2008 r->set_mapped_from_file(true); 2009 log_info(cds)("Mapped %s region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)", 2010 is_static() ? "static " : "dynamic", 2011 MetaspaceShared::bm, p2i(r->mapped_base()), p2i(r->mapped_end()), 2012 shared_region_name[MetaspaceShared::bm]); 2013 return bitmap_base; 2014 } 2015 2016 // This is called when we cannot map the archive at the requested[ base address (usually 0x800000000). 2017 // We relocate all pointers in the 2 core regions (ro, rw). 2018 bool FileMapInfo::relocate_pointers_in_core_regions(intx addr_delta) { 2019 log_debug(cds, reloc)("runtime archive relocation start"); 2020 char* bitmap_base = map_bitmap_region(); 2021 2022 if (bitmap_base == NULL) { 2023 return false; // OOM, or CRC check failure 2024 } else { 2025 size_t ptrmap_size_in_bits = header()->ptrmap_size_in_bits(); 2026 log_debug(cds, reloc)("mapped relocation bitmap @ " INTPTR_FORMAT " (" SIZE_FORMAT " bits)", 2027 p2i(bitmap_base), ptrmap_size_in_bits); 2028 2029 BitMapView ptrmap((BitMap::bm_word_t*)bitmap_base, ptrmap_size_in_bits); 2030 2031 // Patch all pointers in the mapped region that are marked by ptrmap. 2032 address patch_base = (address)mapped_base(); 2033 address patch_end = (address)mapped_end(); 2034 2035 // the current value of the pointers to be patched must be within this 2036 // range (i.e., must be between the requested base address and the address of the current archive). 2037 // Note: top archive may point to objects in the base archive, but not the other way around. 2038 address valid_old_base = (address)header()->requested_base_address(); 2039 address valid_old_end = valid_old_base + mapping_end_offset(); 2040 2041 // after patching, the pointers must point inside this range 2042 // (the requested location of the archive, as mapped at runtime). 2043 address valid_new_base = (address)header()->mapped_base_address(); 2044 address valid_new_end = (address)mapped_end(); 2045 2046 SharedDataRelocator patcher((address*)patch_base, (address*)patch_end, valid_old_base, valid_old_end, 2047 valid_new_base, valid_new_end, addr_delta); 2048 ptrmap.iterate(&patcher); 2049 2050 // The MetaspaceShared::bm region will be unmapped in MetaspaceShared::initialize_shared_spaces(). 2051 2052 log_debug(cds, reloc)("runtime archive relocation done"); 2053 return true; 2054 } 2055 } 2056 2057 size_t FileMapInfo::read_bytes(void* buffer, size_t count) { 2058 assert(_file_open, "Archive file is not open"); 2059 size_t n = ::read(_fd, buffer, (unsigned int)count); 2060 if (n != count) { 2061 // Close the file if there's a problem reading it. 2062 close(); 2063 return 0; 2064 } 2065 _file_offset += count; 2066 return count; 2067 } 2068 2069 // Get the total size in bytes of a read only region 2070 size_t FileMapInfo::readonly_total() { 2071 size_t total = 0; 2072 if (current_info() != nullptr) { 2073 FileMapRegion* r = FileMapInfo::current_info()->region_at(MetaspaceShared::ro); 2074 if (r->read_only()) total += r->used(); 2075 } 2076 if (dynamic_info() != nullptr) { 2077 FileMapRegion* r = FileMapInfo::dynamic_info()->region_at(MetaspaceShared::ro); 2078 if (r->read_only()) total += r->used(); 2079 } 2080 return total; 2081 } 2082 2083 static MemRegion *closed_heap_regions = NULL; 2084 static MemRegion *open_heap_regions = NULL; 2085 static int num_closed_heap_regions = 0; 2086 static int num_open_heap_regions = 0; 2087 2088 #if INCLUDE_CDS_JAVA_HEAP 2089 bool FileMapInfo::has_heap_regions() { 2090 return (region_at(MetaspaceShared::first_closed_heap_region)->used() > 0); 2091 } 2092 2093 // Returns the address range of the archived heap regions computed using the 2094 // current oop encoding mode. This range may be different than the one seen at 2095 // dump time due to encoding mode differences. The result is used in determining 2096 // if/how these regions should be relocated at run time. 2097 MemRegion FileMapInfo::get_heap_regions_requested_range() { 2098 address start = (address) max_uintx; 2099 address end = NULL; 2100 2101 for (int i = MetaspaceShared::first_closed_heap_region; 2102 i <= MetaspaceShared::last_valid_region; 2103 i++) { 2104 FileMapRegion* r = region_at(i); 2105 size_t size = r->used(); 2106 if (size > 0) { 2107 address s = heap_region_requested_address(r); 2108 address e = s + size; 2109 log_info(cds)("Heap region %s = " INTPTR_FORMAT " - " INTPTR_FORMAT " = " SIZE_FORMAT_W(8) " bytes", 2110 region_name(i), p2i(s), p2i(e), size); 2111 if (start > s) { 2112 start = s; 2113 } 2114 if (end < e) { 2115 end = e; 2116 } 2117 } 2118 } 2119 assert(end != NULL, "must have at least one used heap region"); 2120 2121 start = align_down(start, HeapRegion::GrainBytes); 2122 end = align_up(end, HeapRegion::GrainBytes); 2123 2124 return MemRegion((HeapWord*)start, (HeapWord*)end); 2125 } 2126 2127 void FileMapInfo::map_or_load_heap_regions() { 2128 bool success = false; 2129 2130 if (can_use_heap_regions()) { 2131 if (ArchiveHeapLoader::can_map()) { 2132 success = map_heap_regions(); 2133 } else if (ArchiveHeapLoader::can_load()) { 2134 success = ArchiveHeapLoader::load_heap_regions(this); 2135 } else { 2136 if (!UseCompressedOops && !ArchiveHeapLoader::can_map()) { 2137 // TODO - remove implicit knowledge of G1 2138 log_info(cds)("Cannot use CDS heap data. UseG1GC is required for -XX:-UseCompressedOops"); 2139 } else { 2140 log_info(cds)("Cannot use CDS heap data. UseEpsilonGC, UseG1GC, UseSerialGC or UseParallelGC are required."); 2141 } 2142 } 2143 } 2144 2145 if (!success) { 2146 MetaspaceShared::disable_full_module_graph(); 2147 } 2148 } 2149 2150 bool FileMapInfo::can_use_heap_regions() { 2151 if (!has_heap_regions()) { 2152 return false; 2153 } 2154 if (JvmtiExport::should_post_class_file_load_hook() && JvmtiExport::has_early_class_hook_env()) { 2155 ShouldNotReachHere(); // CDS should have been disabled. 2156 // The archived objects are mapped at JVM start-up, but we don't know if 2157 // j.l.String or j.l.Class might be replaced by the ClassFileLoadHook, 2158 // which would make the archived String or mirror objects invalid. Let's be safe and not 2159 // use the archived objects. These 2 classes are loaded during the JVMTI "early" stage. 2160 // 2161 // If JvmtiExport::has_early_class_hook_env() is false, the classes of some objects 2162 // in the archived subgraphs may be replaced by the ClassFileLoadHook. But that's OK 2163 // because we won't install an archived object subgraph if the klass of any of the 2164 // referenced objects are replaced. See HeapShared::initialize_from_archived_subgraph(). 2165 } 2166 2167 log_info(cds)("CDS archive was created with max heap size = " SIZE_FORMAT "M, and the following configuration:", 2168 max_heap_size()/M); 2169 log_info(cds)(" narrow_klass_base = " PTR_FORMAT ", narrow_klass_shift = %d", 2170 p2i(narrow_klass_base()), narrow_klass_shift()); 2171 log_info(cds)(" narrow_oop_mode = %d, narrow_oop_base = " PTR_FORMAT ", narrow_oop_shift = %d", 2172 narrow_oop_mode(), p2i(narrow_oop_base()), narrow_oop_shift()); 2173 log_info(cds)(" heap range = [" PTR_FORMAT " - " PTR_FORMAT "]", 2174 p2i(header()->heap_begin()), p2i(header()->heap_end())); 2175 2176 log_info(cds)("The current max heap size = " SIZE_FORMAT "M, HeapRegion::GrainBytes = " SIZE_FORMAT, 2177 MaxHeapSize/M, HeapRegion::GrainBytes); 2178 log_info(cds)(" narrow_klass_base = " PTR_FORMAT ", narrow_klass_shift = %d", 2179 p2i(CompressedKlassPointers::base()), CompressedKlassPointers::shift()); 2180 log_info(cds)(" narrow_oop_mode = %d, narrow_oop_base = " PTR_FORMAT ", narrow_oop_shift = %d", 2181 CompressedOops::mode(), p2i(CompressedOops::base()), CompressedOops::shift()); 2182 log_info(cds)(" heap range = [" PTR_FORMAT " - " PTR_FORMAT "]", 2183 UseCompressedOops ? p2i(CompressedOops::begin()) : 2184 UseG1GC ? p2i((address)G1CollectedHeap::heap()->reserved().start()) : 0L, 2185 UseCompressedOops ? p2i(CompressedOops::end()) : 2186 UseG1GC ? p2i((address)G1CollectedHeap::heap()->reserved().end()) : 0L); 2187 2188 if (narrow_klass_base() != CompressedKlassPointers::base() || 2189 narrow_klass_shift() != CompressedKlassPointers::shift()) { 2190 log_info(cds)("CDS heap data cannot be used because the archive was created with an incompatible narrow klass encoding mode."); 2191 return false; 2192 } 2193 return true; 2194 } 2195 2196 // The actual address of this region during dump time. 2197 address FileMapInfo::heap_region_dumptime_address(FileMapRegion* r) { 2198 assert(UseSharedSpaces, "runtime only"); 2199 r->assert_is_heap_region(); 2200 assert(is_aligned(r->mapping_offset(), sizeof(HeapWord)), "must be"); 2201 if (UseCompressedOops) { 2202 return /*dumptime*/ narrow_oop_base() + r->mapping_offset(); 2203 } else { 2204 return heap_region_requested_address(r); 2205 } 2206 } 2207 2208 // The address where this region can be mapped into the runtime heap without 2209 // patching any of the pointers that are embedded in this region. 2210 address FileMapInfo::heap_region_requested_address(FileMapRegion* r) { 2211 assert(UseSharedSpaces, "runtime only"); 2212 r->assert_is_heap_region(); 2213 assert(is_aligned(r->mapping_offset(), sizeof(HeapWord)), "must be"); 2214 assert(ArchiveHeapLoader::can_map(), "cannot be used by ArchiveHeapLoader::can_load() mode"); 2215 if (UseCompressedOops) { 2216 // We can avoid relocation if each region's offset from the runtime CompressedOops::base() 2217 // is the same as its offset from the CompressedOops::base() during dumptime. 2218 // Note that CompressedOops::base() may be different between dumptime and runtime. 2219 // 2220 // Example: 2221 // Dumptime base = 0x1000 and shift is 0. We have a region at address 0x2000. There's a 2222 // narrowOop P stored in this region that points to an object at address 0x2200. 2223 // P's encoded value is 0x1200. 2224 // 2225 // Runtime base = 0x4000 and shift is also 0. If we map this region at 0x5000, then 2226 // the value P can remain 0x1200. The decoded address = (0x4000 + (0x1200 << 0)) = 0x5200, 2227 // which is the runtime location of the referenced object. 2228 return /*runtime*/ CompressedOops::base() + r->mapping_offset(); 2229 } else { 2230 // We can avoid relocation if each region is mapped into the exact same address 2231 // where it was at dump time. 2232 return /*dumptime*/header()->heap_begin() + r->mapping_offset(); 2233 } 2234 } 2235 2236 // The address where this shared heap region is actually mapped at runtime. This function 2237 // can be called only after we have determined the value for ArchiveHeapLoader::mapped_heap_delta(). 2238 address FileMapInfo::heap_region_mapped_address(FileMapRegion* r) { 2239 assert(UseSharedSpaces, "runtime only"); 2240 r->assert_is_heap_region(); 2241 assert(ArchiveHeapLoader::can_map(), "cannot be used by ArchiveHeapLoader::can_load() mode"); 2242 return heap_region_requested_address(r) + ArchiveHeapLoader::mapped_heap_delta(); 2243 } 2244 2245 // 2246 // Map the closed and open archive heap objects to the runtime java heap. 2247 // 2248 // The shared objects are mapped at (or close to ) the java heap top in 2249 // closed archive regions. The mapped objects contain no out-going 2250 // references to any other java heap regions. GC does not write into the 2251 // mapped closed archive heap region. 2252 // 2253 // The open archive heap objects are mapped below the shared objects in 2254 // the runtime java heap. The mapped open archive heap data only contains 2255 // references to the shared objects and open archive objects initially. 2256 // During runtime execution, out-going references to any other java heap 2257 // regions may be added. GC may mark and update references in the mapped 2258 // open archive objects. 2259 void FileMapInfo::map_heap_regions_impl() { 2260 // G1 -- always map at the very top of the heap to avoid fragmentation. 2261 assert(UseG1GC, "the following code assumes G1"); 2262 _heap_pointers_need_patching = false; 2263 2264 MemRegion heap_range = G1CollectedHeap::heap()->reserved(); 2265 MemRegion archive_range = get_heap_regions_requested_range(); 2266 2267 address heap_end = (address)heap_range.end(); 2268 address archive_end = (address)archive_range.end(); 2269 2270 assert(is_aligned(heap_end, HeapRegion::GrainBytes), "must be"); 2271 assert(is_aligned(archive_end, HeapRegion::GrainBytes), "must be"); 2272 2273 if (UseCompressedOops && 2274 (narrow_oop_mode() != CompressedOops::mode() || 2275 narrow_oop_shift() != CompressedOops::shift())) { 2276 log_info(cds)("CDS heap data needs to be relocated because the archive was created with an incompatible oop encoding mode."); 2277 _heap_pointers_need_patching = true; 2278 } else if (!heap_range.contains(archive_range)) { 2279 log_info(cds)("CDS heap data needs to be relocated because"); 2280 log_info(cds)("the desired range " PTR_FORMAT " - " PTR_FORMAT, p2i(archive_range.start()), p2i(archive_range.end())); 2281 log_info(cds)("is outside of the heap " PTR_FORMAT " - " PTR_FORMAT, p2i(heap_range.start()), p2i(heap_range.end())); 2282 _heap_pointers_need_patching = true; 2283 } else { 2284 assert(heap_end >= archive_end, "must be"); 2285 if (heap_end != archive_end) { 2286 log_info(cds)("CDS heap data needs to be relocated to the end of the runtime heap to reduce fragmentation"); 2287 _heap_pointers_need_patching = true; 2288 } 2289 } 2290 2291 ptrdiff_t delta = 0; 2292 if (_heap_pointers_need_patching) { 2293 delta = heap_end - archive_end; 2294 } 2295 2296 log_info(cds)("CDS heap data relocation delta = " INTX_FORMAT " bytes", delta); 2297 2298 FileMapRegion* r = region_at(MetaspaceShared::first_closed_heap_region); 2299 address relocated_closed_heap_region_bottom = heap_region_requested_address(r) + delta; 2300 2301 if (!is_aligned(relocated_closed_heap_region_bottom, HeapRegion::GrainBytes)) { 2302 // Align the bottom of the closed archive heap regions at G1 region boundary. 2303 // This will avoid the situation where the highest open region and the lowest 2304 // closed region sharing the same G1 region. Otherwise we will fail to map the 2305 // open regions. 2306 size_t align = size_t(relocated_closed_heap_region_bottom) % HeapRegion::GrainBytes; 2307 delta -= align; 2308 log_info(cds)("CDS heap data needs to be relocated lower by a further " SIZE_FORMAT 2309 " bytes to " INTX_FORMAT " to be aligned with HeapRegion::GrainBytes", 2310 align, delta); 2311 _heap_pointers_need_patching = true; 2312 } 2313 2314 ArchiveHeapLoader::init_mapped_heap_relocation(delta, narrow_oop_shift()); 2315 relocated_closed_heap_region_bottom = heap_region_mapped_address(r); 2316 2317 assert(is_aligned(relocated_closed_heap_region_bottom, HeapRegion::GrainBytes), 2318 "must be"); 2319 2320 if (_heap_pointers_need_patching) { 2321 char* bitmap_base = map_bitmap_region(); 2322 if (bitmap_base == NULL) { 2323 log_info(cds)("CDS heap cannot be used because bitmap region cannot be mapped"); 2324 _heap_pointers_need_patching = false; 2325 return; 2326 } 2327 } 2328 2329 // Map the closed heap regions: GC does not write into these regions. 2330 if (map_heap_regions(MetaspaceShared::first_closed_heap_region, 2331 MetaspaceShared::max_num_closed_heap_regions, 2332 /*is_open_archive=*/ false, 2333 &closed_heap_regions, &num_closed_heap_regions)) { 2334 ArchiveHeapLoader::set_closed_regions_mapped(); 2335 2336 // Now, map the open heap regions: GC can write into these regions. 2337 if (map_heap_regions(MetaspaceShared::first_open_heap_region, 2338 MetaspaceShared::max_num_open_heap_regions, 2339 /*is_open_archive=*/ true, 2340 &open_heap_regions, &num_open_heap_regions)) { 2341 ArchiveHeapLoader::set_open_regions_mapped(); 2342 } 2343 } 2344 } 2345 2346 bool FileMapInfo::map_heap_regions() { 2347 map_heap_regions_impl(); 2348 2349 if (!ArchiveHeapLoader::closed_regions_mapped()) { 2350 assert(closed_heap_regions == NULL && 2351 num_closed_heap_regions == 0, "sanity"); 2352 } 2353 2354 if (!ArchiveHeapLoader::open_regions_mapped()) { 2355 assert(open_heap_regions == NULL && num_open_heap_regions == 0, "sanity"); 2356 return false; 2357 } else { 2358 return true; 2359 } 2360 } 2361 2362 bool FileMapInfo::map_heap_regions(int first, int max, bool is_open_archive, 2363 MemRegion** regions_ret, int* num_regions_ret) { 2364 MemRegion* regions = MemRegion::create_array(max, mtInternal); 2365 2366 struct Cleanup { 2367 MemRegion* _regions; 2368 uint _length; 2369 bool _aborted; 2370 Cleanup(MemRegion* regions, uint length) : _regions(regions), _length(length), _aborted(true) { } 2371 ~Cleanup() { if (_aborted) { MemRegion::destroy_array(_regions, _length); } } 2372 } cleanup(regions, max); 2373 2374 FileMapRegion* r; 2375 int num_regions = 0; 2376 2377 for (int i = first; 2378 i < first + max; i++) { 2379 r = region_at(i); 2380 size_t size = r->used(); 2381 if (size > 0) { 2382 HeapWord* start = (HeapWord*)heap_region_mapped_address(r); 2383 regions[num_regions] = MemRegion(start, size / HeapWordSize); 2384 num_regions ++; 2385 log_info(cds)("Trying to map heap data: region[%d] at " INTPTR_FORMAT ", size = " SIZE_FORMAT_W(8) " bytes", 2386 i, p2i(start), size); 2387 } 2388 } 2389 2390 if (num_regions == 0) { 2391 return false; // no archived java heap data 2392 } 2393 2394 // Check that regions are within the java heap 2395 if (!G1CollectedHeap::heap()->check_archive_addresses(regions, num_regions)) { 2396 log_info(cds)("UseSharedSpaces: Unable to allocate region, range is not within java heap."); 2397 return false; 2398 } 2399 2400 // allocate from java heap 2401 if (!G1CollectedHeap::heap()->alloc_archive_regions( 2402 regions, num_regions, is_open_archive)) { 2403 log_info(cds)("UseSharedSpaces: Unable to allocate region, java heap range is already in use."); 2404 return false; 2405 } 2406 2407 // Map the archived heap data. No need to call MemTracker::record_virtual_memory_type() 2408 // for mapped regions as they are part of the reserved java heap, which is 2409 // already recorded. 2410 for (int i = 0; i < num_regions; i++) { 2411 r = region_at(first + i); 2412 char* addr = (char*)regions[i].start(); 2413 char* base = os::map_memory(_fd, _full_path, r->file_offset(), 2414 addr, regions[i].byte_size(), r->read_only(), 2415 r->allow_exec()); 2416 if (base == NULL || base != addr) { 2417 // dealloc the regions from java heap 2418 dealloc_heap_regions(regions, num_regions); 2419 log_info(cds)("UseSharedSpaces: Unable to map at required address in java heap. " 2420 INTPTR_FORMAT ", size = " SIZE_FORMAT " bytes", 2421 p2i(addr), regions[i].byte_size()); 2422 return false; 2423 } 2424 2425 if (VerifySharedSpaces && !region_crc_check(addr, regions[i].byte_size(), r->crc())) { 2426 // dealloc the regions from java heap 2427 dealloc_heap_regions(regions, num_regions); 2428 log_info(cds)("UseSharedSpaces: mapped heap regions are corrupt"); 2429 return false; 2430 } 2431 2432 r->set_mapped_base(base); 2433 } 2434 2435 cleanup._aborted = false; 2436 // the shared heap data is mapped successfully 2437 *regions_ret = regions; 2438 *num_regions_ret = num_regions; 2439 return true; 2440 } 2441 2442 void FileMapInfo::patch_heap_embedded_pointers() { 2443 if (!_heap_pointers_need_patching) { 2444 return; 2445 } 2446 2447 patch_heap_embedded_pointers(closed_heap_regions, 2448 num_closed_heap_regions, 2449 MetaspaceShared::first_closed_heap_region); 2450 2451 patch_heap_embedded_pointers(open_heap_regions, 2452 num_open_heap_regions, 2453 MetaspaceShared::first_open_heap_region); 2454 } 2455 2456 narrowOop FileMapInfo::encoded_heap_region_dumptime_address(FileMapRegion* r) { 2457 assert(UseSharedSpaces, "runtime only"); 2458 assert(UseCompressedOops, "sanity"); 2459 r->assert_is_heap_region(); 2460 return CompressedOops::narrow_oop_cast(r->mapping_offset() >> narrow_oop_shift()); 2461 } 2462 2463 void FileMapInfo::patch_heap_embedded_pointers(MemRegion* regions, int num_regions, 2464 int first_region_idx) { 2465 char* bitmap_base = map_bitmap_region(); 2466 assert(bitmap_base != NULL, "must have already been mapped"); 2467 for (int i=0; i<num_regions; i++) { 2468 int region_idx = i + first_region_idx; 2469 FileMapRegion* r = region_at(region_idx); 2470 2471 ArchiveHeapLoader::patch_embedded_pointers( 2472 this, r, regions[i], 2473 (address)(region_at(MetaspaceShared::bm)->mapped_base()) + r->oopmap_offset(), 2474 r->oopmap_size_in_bits()); 2475 } 2476 } 2477 2478 // This internally allocates objects using vmClasses::Object_klass(), so it 2479 // must be called after the Object_klass is loaded 2480 void FileMapInfo::fixup_mapped_heap_regions() { 2481 assert(vmClasses::Object_klass_loaded(), "must be"); 2482 // If any closed regions were found, call the fill routine to make them parseable. 2483 // Note that closed_heap_regions may be non-NULL even if no regions were found. 2484 if (num_closed_heap_regions != 0) { 2485 assert(closed_heap_regions != NULL, 2486 "Null closed_heap_regions array with non-zero count"); 2487 G1CollectedHeap::heap()->fill_archive_regions(closed_heap_regions, 2488 num_closed_heap_regions); 2489 // G1 marking uses the BOT for object chunking during marking in 2490 // G1CMObjArrayProcessor::process_slice(); for this reason we need to 2491 // initialize the BOT for closed archive regions too. 2492 G1CollectedHeap::heap()->populate_archive_regions_bot_part(closed_heap_regions, 2493 num_closed_heap_regions); 2494 } 2495 2496 // do the same for mapped open archive heap regions 2497 if (num_open_heap_regions != 0) { 2498 assert(open_heap_regions != NULL, "NULL open_heap_regions array with non-zero count"); 2499 G1CollectedHeap::heap()->fill_archive_regions(open_heap_regions, 2500 num_open_heap_regions); 2501 2502 // Populate the open archive regions' G1BlockOffsetTableParts. That ensures 2503 // fast G1BlockOffsetTablePart::block_start operations for any given address 2504 // within the open archive regions when trying to find start of an object 2505 // (e.g. during card table scanning). 2506 G1CollectedHeap::heap()->populate_archive_regions_bot_part(open_heap_regions, 2507 num_open_heap_regions); 2508 } 2509 } 2510 2511 // dealloc the archive regions from java heap 2512 void FileMapInfo::dealloc_heap_regions(MemRegion* regions, int num) { 2513 if (num > 0) { 2514 assert(regions != NULL, "Null archive regions array with non-zero count"); 2515 G1CollectedHeap::heap()->dealloc_archive_regions(regions, num); 2516 } 2517 } 2518 #endif // INCLUDE_CDS_JAVA_HEAP 2519 2520 bool FileMapInfo::region_crc_check(char* buf, size_t size, int expected_crc) { 2521 int crc = ClassLoader::crc32(0, buf, (jint)size); 2522 if (crc != expected_crc) { 2523 fail_continue("Checksum verification failed."); 2524 return false; 2525 } 2526 return true; 2527 } 2528 2529 bool FileMapInfo::verify_region_checksum(int i) { 2530 assert(VerifySharedSpaces, "sanity"); 2531 size_t sz = region_at(i)->used(); 2532 2533 if (sz == 0) { 2534 return true; // no data 2535 } else { 2536 return region_crc_check(region_addr(i), sz, region_at(i)->crc()); 2537 } 2538 } 2539 2540 void FileMapInfo::unmap_regions(int regions[], int num_regions) { 2541 for (int r = 0; r < num_regions; r++) { 2542 int idx = regions[r]; 2543 unmap_region(idx); 2544 } 2545 } 2546 2547 // Unmap a memory region in the address space. 2548 2549 void FileMapInfo::unmap_region(int i) { 2550 assert(!HeapShared::is_heap_region(i), "sanity"); 2551 FileMapRegion* r = region_at(i); 2552 char* mapped_base = r->mapped_base(); 2553 size_t size = r->used_aligned(); 2554 2555 if (mapped_base != NULL) { 2556 if (size > 0 && r->mapped_from_file()) { 2557 log_info(cds)("Unmapping region #%d at base " INTPTR_FORMAT " (%s)", i, p2i(mapped_base), 2558 shared_region_name[i]); 2559 if (!os::unmap_memory(mapped_base, size)) { 2560 fatal("os::unmap_memory failed"); 2561 } 2562 } 2563 r->set_mapped_base(NULL); 2564 } 2565 } 2566 2567 void FileMapInfo::assert_mark(bool check) { 2568 if (!check) { 2569 fail_stop("Mark mismatch while restoring from shared file."); 2570 } 2571 } 2572 2573 void FileMapInfo::metaspace_pointers_do(MetaspaceClosure* it, bool use_copy) { 2574 if (use_copy) { 2575 _saved_shared_path_table.metaspace_pointers_do(it); 2576 } else { 2577 _shared_path_table.metaspace_pointers_do(it); 2578 } 2579 } 2580 2581 FileMapInfo* FileMapInfo::_current_info = NULL; 2582 FileMapInfo* FileMapInfo::_dynamic_archive_info = NULL; 2583 bool FileMapInfo::_heap_pointers_need_patching = false; 2584 SharedPathTable FileMapInfo::_shared_path_table; 2585 SharedPathTable FileMapInfo::_saved_shared_path_table; 2586 Array<u8>* FileMapInfo::_saved_shared_path_table_array = NULL; 2587 bool FileMapInfo::_validating_shared_path_table = false; 2588 bool FileMapInfo::_memory_mapping_failed = false; 2589 GrowableArray<const char*>* FileMapInfo::_non_existent_class_paths = NULL; 2590 2591 // Open the shared archive file, read and validate the header 2592 // information (version, boot classpath, etc.). If initialization 2593 // fails, shared spaces are disabled and the file is closed. [See 2594 // fail_continue.] 2595 // 2596 // Validation of the archive is done in two steps: 2597 // 2598 // [1] validate_header() - done here. 2599 // [2] validate_shared_path_table - this is done later, because the table is in the RW 2600 // region of the archive, which is not mapped yet. 2601 bool FileMapInfo::initialize() { 2602 assert(UseSharedSpaces, "UseSharedSpaces expected."); 2603 2604 if (JvmtiExport::should_post_class_file_load_hook() && JvmtiExport::has_early_class_hook_env()) { 2605 // CDS assumes that no classes resolved in vmClasses::resolve_all() 2606 // are replaced at runtime by JVMTI ClassFileLoadHook. All of those classes are resolved 2607 // during the JVMTI "early" stage, so we can still use CDS if 2608 // JvmtiExport::has_early_class_hook_env() is false. 2609 FileMapInfo::fail_continue("CDS is disabled because early JVMTI ClassFileLoadHook is in use."); 2610 return false; 2611 } 2612 2613 if (!Arguments::has_jimage()) { 2614 FileMapInfo::fail_continue("The shared archive file cannot be used with an exploded module build."); 2615 return false; 2616 } 2617 2618 if (!open_for_read() || !init_from_file(_fd) || !validate_header()) { 2619 if (_is_static) { 2620 FileMapInfo::fail_continue("Initialize static archive failed."); 2621 return false; 2622 } else { 2623 FileMapInfo::fail_continue("Initialize dynamic archive failed."); 2624 if (AutoCreateSharedArchive) { 2625 DynamicDumpSharedSpaces = true; 2626 ArchiveClassesAtExit = Arguments::GetSharedDynamicArchivePath(); 2627 } 2628 return false; 2629 } 2630 } 2631 2632 return true; 2633 } 2634 2635 char* FileMapInfo::region_addr(int idx) { 2636 assert(UseSharedSpaces, "must be"); 2637 FileMapRegion* r = region_at(idx); 2638 return r->mapped_base(); 2639 } 2640 2641 // The 2 core spaces are RW->RO 2642 FileMapRegion* FileMapInfo::first_core_region() const { 2643 return region_at(MetaspaceShared::rw); 2644 } 2645 2646 FileMapRegion* FileMapInfo::last_core_region() const { 2647 return region_at(MetaspaceShared::ro); 2648 } 2649 2650 void FileMapHeader::set_as_offset(char* p, size_t *offset) { 2651 *offset = ArchiveBuilder::current()->any_to_offset((address)p); 2652 } 2653 2654 int FileMapHeader::compute_crc() { 2655 char* start = (char*)this; 2656 // start computing from the field after _header_size to end of base archive name. 2657 char* buf = (char*)&(_generic_header._header_size) + sizeof(_generic_header._header_size); 2658 size_t sz = header_size() - (buf - start); 2659 int crc = ClassLoader::crc32(0, buf, (jint)sz); 2660 return crc; 2661 } 2662 2663 // This function should only be called during run time with UseSharedSpaces enabled. 2664 bool FileMapHeader::validate() { 2665 if (_obj_alignment != ObjectAlignmentInBytes) { 2666 FileMapInfo::fail_continue("The shared archive file's ObjectAlignmentInBytes of %d" 2667 " does not equal the current ObjectAlignmentInBytes of %d.", 2668 _obj_alignment, ObjectAlignmentInBytes); 2669 return false; 2670 } 2671 if (_compact_strings != CompactStrings) { 2672 FileMapInfo::fail_continue("The shared archive file's CompactStrings setting (%s)" 2673 " does not equal the current CompactStrings setting (%s).", 2674 _compact_strings ? "enabled" : "disabled", 2675 CompactStrings ? "enabled" : "disabled"); 2676 return false; 2677 } 2678 2679 // This must be done after header validation because it might change the 2680 // header data 2681 const char* prop = Arguments::get_property("java.system.class.loader"); 2682 if (prop != NULL) { 2683 warning("Archived non-system classes are disabled because the " 2684 "java.system.class.loader property is specified (value = \"%s\"). " 2685 "To use archived non-system classes, this property must not be set", prop); 2686 _has_platform_or_app_classes = false; 2687 } 2688 2689 2690 if (!_verify_local && BytecodeVerificationLocal) { 2691 // we cannot load boot classes, so there's no point of using the CDS archive 2692 FileMapInfo::fail_continue("The shared archive file's BytecodeVerificationLocal setting (%s)" 2693 " does not equal the current BytecodeVerificationLocal setting (%s).", 2694 _verify_local ? "enabled" : "disabled", 2695 BytecodeVerificationLocal ? "enabled" : "disabled"); 2696 return false; 2697 } 2698 2699 // For backwards compatibility, we don't check the BytecodeVerificationRemote setting 2700 // if the archive only contains system classes. 2701 if (_has_platform_or_app_classes 2702 && !_verify_remote // we didn't verify the archived platform/app classes 2703 && BytecodeVerificationRemote) { // but we want to verify all loaded platform/app classes 2704 FileMapInfo::fail_continue("The shared archive file was created with less restrictive " 2705 "verification setting than the current setting."); 2706 // Pretend that we didn't have any archived platform/app classes, so they won't be loaded 2707 // by SystemDictionaryShared. 2708 _has_platform_or_app_classes = false; 2709 } 2710 2711 // Java agents are allowed during run time. Therefore, the following condition is not 2712 // checked: (!_allow_archiving_with_java_agent && AllowArchivingWithJavaAgent) 2713 // Note: _allow_archiving_with_java_agent is set in the shared archive during dump time 2714 // while AllowArchivingWithJavaAgent is set during the current run. 2715 if (_allow_archiving_with_java_agent && !AllowArchivingWithJavaAgent) { 2716 FileMapInfo::fail_continue("The setting of the AllowArchivingWithJavaAgent is different " 2717 "from the setting in the shared archive."); 2718 return false; 2719 } 2720 2721 if (_allow_archiving_with_java_agent) { 2722 warning("This archive was created with AllowArchivingWithJavaAgent. It should be used " 2723 "for testing purposes only and should not be used in a production environment"); 2724 } 2725 2726 log_info(cds)("Archive was created with UseCompressedOops = %d, UseCompressedClassPointers = %d", 2727 compressed_oops(), compressed_class_pointers()); 2728 if (compressed_oops() != UseCompressedOops || compressed_class_pointers() != UseCompressedClassPointers) { 2729 FileMapInfo::fail_continue("Unable to use shared archive.\nThe saved state of UseCompressedOops and UseCompressedClassPointers is " 2730 "different from runtime, CDS will be disabled."); 2731 return false; 2732 } 2733 2734 if (!_use_optimized_module_handling) { 2735 MetaspaceShared::disable_optimized_module_handling(); 2736 log_info(cds)("optimized module handling: disabled because archive was created without optimized module handling"); 2737 } 2738 2739 if (!_use_full_module_graph) { 2740 MetaspaceShared::disable_full_module_graph(); 2741 log_info(cds)("full module graph: disabled because archive was created without full module graph"); 2742 } 2743 2744 return true; 2745 } 2746 2747 bool FileMapInfo::validate_header() { 2748 if (!header()->validate()) { 2749 return false; 2750 } 2751 if (_is_static) { 2752 return true; 2753 } else { 2754 return DynamicArchive::validate(this); 2755 } 2756 } 2757 2758 // Unmap mapped regions of shared space. 2759 void FileMapInfo::stop_sharing_and_unmap(const char* msg) { 2760 MetaspaceShared::set_shared_metaspace_range(NULL, NULL, NULL); 2761 2762 FileMapInfo *map_info = FileMapInfo::current_info(); 2763 if (map_info) { 2764 map_info->fail_continue("%s", msg); 2765 for (int i = 0; i < MetaspaceShared::num_non_heap_regions; i++) { 2766 if (!HeapShared::is_heap_region(i)) { 2767 map_info->unmap_region(i); 2768 } 2769 } 2770 // Dealloc the archive heap regions only without unmapping. The regions are part 2771 // of the java heap. Unmapping of the heap regions are managed by GC. 2772 map_info->dealloc_heap_regions(open_heap_regions, 2773 num_open_heap_regions); 2774 map_info->dealloc_heap_regions(closed_heap_regions, 2775 num_closed_heap_regions); 2776 } else if (DumpSharedSpaces) { 2777 fail_stop("%s", msg); 2778 } 2779 } 2780 2781 #if INCLUDE_JVMTI 2782 ClassPathEntry** FileMapInfo::_classpath_entries_for_jvmti = NULL; 2783 2784 ClassPathEntry* FileMapInfo::get_classpath_entry_for_jvmti(int i, TRAPS) { 2785 if (i == 0) { 2786 // index 0 corresponds to the ClassPathImageEntry which is a globally shared object 2787 // and should never be deleted. 2788 return ClassLoader::get_jrt_entry(); 2789 } 2790 ClassPathEntry* ent = _classpath_entries_for_jvmti[i]; 2791 if (ent == NULL) { 2792 SharedClassPathEntry* scpe = shared_path(i); 2793 assert(scpe->is_jar(), "must be"); // other types of scpe will not produce archived classes 2794 2795 const char* path = scpe->name(); 2796 struct stat st; 2797 if (os::stat(path, &st) != 0) { 2798 char *msg = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(path) + 128); 2799 jio_snprintf(msg, strlen(path) + 127, "error in finding JAR file %s", path); 2800 THROW_MSG_(vmSymbols::java_io_IOException(), msg, NULL); 2801 } else { 2802 ent = ClassLoader::create_class_path_entry(THREAD, path, &st, false, false); 2803 if (ent == NULL) { 2804 char *msg = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(path) + 128); 2805 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path); 2806 THROW_MSG_(vmSymbols::java_io_IOException(), msg, NULL); 2807 } 2808 } 2809 2810 MutexLocker mu(THREAD, CDSClassFileStream_lock); 2811 if (_classpath_entries_for_jvmti[i] == NULL) { 2812 _classpath_entries_for_jvmti[i] = ent; 2813 } else { 2814 // Another thread has beat me to creating this entry 2815 delete ent; 2816 ent = _classpath_entries_for_jvmti[i]; 2817 } 2818 } 2819 2820 return ent; 2821 } 2822 2823 ClassFileStream* FileMapInfo::open_stream_for_jvmti(InstanceKlass* ik, Handle class_loader, TRAPS) { 2824 int path_index = ik->shared_classpath_index(); 2825 assert(path_index >= 0, "should be called for shared built-in classes only"); 2826 assert(path_index < (int)get_number_of_shared_paths(), "sanity"); 2827 2828 ClassPathEntry* cpe = get_classpath_entry_for_jvmti(path_index, CHECK_NULL); 2829 assert(cpe != NULL, "must be"); 2830 2831 Symbol* name = ik->name(); 2832 const char* const class_name = name->as_C_string(); 2833 const char* const file_name = ClassLoader::file_name_for_class_name(class_name, 2834 name->utf8_length()); 2835 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader()); 2836 ClassFileStream* cfs = cpe->open_stream_for_loader(THREAD, file_name, loader_data); 2837 assert(cfs != NULL, "must be able to read the classfile data of shared classes for built-in loaders."); 2838 log_debug(cds, jvmti)("classfile data for %s [%d: %s] = %d bytes", class_name, path_index, 2839 cfs->source(), cfs->length()); 2840 return cfs; 2841 } 2842 2843 #endif