1 /* 2 * Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "jvm.h" 27 #include "classfile/classLoader.inline.hpp" 28 #include "classfile/classLoaderExt.hpp" 29 #include "classfile/compactHashtable.inline.hpp" 30 #include "classfile/stringTable.hpp" 31 #include "classfile/symbolTable.hpp" 32 #include "classfile/systemDictionaryShared.hpp" 33 #include "classfile/altHashing.hpp" 34 #include "logging/log.hpp" 35 #include "logging/logStream.hpp" 36 #include "logging/logMessage.hpp" 37 #include "memory/filemap.hpp" 38 #include "memory/metadataFactory.hpp" 39 #include "memory/metaspaceClosure.hpp" 40 #include "memory/metaspaceShared.hpp" 41 #include "memory/oopFactory.hpp" 42 #include "oops/compressedOops.inline.hpp" 43 #include "oops/objArrayOop.hpp" 44 #include "prims/jvmtiExport.hpp" 45 #include "runtime/arguments.hpp" 46 #include "runtime/java.hpp" 47 #include "runtime/os.hpp" 48 #include "runtime/vm_version.hpp" 49 #include "services/memTracker.hpp" 50 #include "utilities/align.hpp" 51 #include "utilities/defaultStream.hpp" 52 #if INCLUDE_G1GC 53 #include "gc/g1/g1CollectedHeap.hpp" 54 #endif 55 56 # include <sys/stat.h> 57 # include <errno.h> 58 59 #ifndef O_BINARY // if defined (Win32) use binary files. 60 #define O_BINARY 0 // otherwise do nothing. 61 #endif 62 63 extern address JVM_FunctionAtStart(); 64 extern address JVM_FunctionAtEnd(); 65 66 // Complain and stop. All error conditions occurring during the writing of 67 // an archive file should stop the process. Unrecoverable errors during 68 // the reading of the archive file should stop the process. 69 70 static void fail(const char *msg, va_list ap) { 71 // This occurs very early during initialization: tty is not initialized. 72 jio_fprintf(defaultStream::error_stream(), 73 "An error has occurred while processing the" 74 " shared archive file.\n"); 75 jio_vfprintf(defaultStream::error_stream(), msg, ap); 76 jio_fprintf(defaultStream::error_stream(), "\n"); 77 // Do not change the text of the below message because some tests check for it. 78 vm_exit_during_initialization("Unable to use shared archive.", NULL); 79 } 80 81 82 void FileMapInfo::fail_stop(const char *msg, ...) { 83 va_list ap; 84 va_start(ap, msg); 85 fail(msg, ap); // Never returns. 86 va_end(ap); // for completeness. 87 } 88 89 90 // Complain and continue. Recoverable errors during the reading of the 91 // archive file may continue (with sharing disabled). 92 // 93 // If we continue, then disable shared spaces and close the file. 94 95 void FileMapInfo::fail_continue(const char *msg, ...) { 96 va_list ap; 97 va_start(ap, msg); 98 MetaspaceShared::set_archive_loading_failed(); 99 if (PrintSharedArchiveAndExit && _validating_shared_path_table) { 100 // If we are doing PrintSharedArchiveAndExit and some of the classpath entries 101 // do not validate, we can still continue "limping" to validate the remaining 102 // entries. No need to quit. 103 tty->print("["); 104 tty->vprint(msg, ap); 105 tty->print_cr("]"); 106 } else { 107 if (RequireSharedSpaces) { 108 fail(msg, ap); 109 } else { 110 if (log_is_enabled(Info, cds)) { 111 ResourceMark rm; 112 LogStream ls(Log(cds)::info()); 113 ls.print("UseSharedSpaces: "); 114 ls.vprint_cr(msg, ap); 115 } 116 } 117 UseSharedSpaces = false; 118 assert(current_info() != NULL, "singleton must be registered"); 119 current_info()->close(); 120 } 121 va_end(ap); 122 } 123 124 // Fill in the fileMapInfo structure with data about this VM instance. 125 126 // This method copies the vm version info into header_version. If the version is too 127 // long then a truncated version, which has a hash code appended to it, is copied. 128 // 129 // Using a template enables this method to verify that header_version is an array of 130 // length JVM_IDENT_MAX. This ensures that the code that writes to the CDS file and 131 // the code that reads the CDS file will both use the same size buffer. Hence, will 132 // use identical truncation. This is necessary for matching of truncated versions. 133 template <int N> static void get_header_version(char (&header_version) [N]) { 134 assert(N == JVM_IDENT_MAX, "Bad header_version size"); 135 136 const char *vm_version = VM_Version::internal_vm_info_string(); 137 const int version_len = (int)strlen(vm_version); 138 139 if (version_len < (JVM_IDENT_MAX-1)) { 140 strcpy(header_version, vm_version); 141 142 } else { 143 // Get the hash value. Use a static seed because the hash needs to return the same 144 // value over multiple jvm invocations. 145 unsigned int hash = AltHashing::murmur3_32(8191, (const jbyte*)vm_version, version_len); 146 147 // Truncate the ident, saving room for the 8 hex character hash value. 148 strncpy(header_version, vm_version, JVM_IDENT_MAX-9); 149 150 // Append the hash code as eight hex digits. 151 sprintf(&header_version[JVM_IDENT_MAX-9], "%08x", hash); 152 header_version[JVM_IDENT_MAX-1] = 0; // Null terminate. 153 } 154 } 155 156 FileMapInfo::FileMapInfo() { 157 assert(_current_info == NULL, "must be singleton"); // not thread safe 158 _current_info = this; 159 memset((void*)this, 0, sizeof(FileMapInfo)); 160 _file_offset = 0; 161 _file_open = false; 162 _header = (FileMapHeader*)os::malloc(sizeof(FileMapHeader), mtInternal); 163 _header->_version = INVALID_CDS_ARCHIVE_VERSION; 164 _header->_has_platform_or_app_classes = true; 165 } 166 167 FileMapInfo::~FileMapInfo() { 168 assert(_current_info == this, "must be singleton"); // not thread safe 169 _current_info = NULL; 170 } 171 172 void FileMapInfo::populate_header(size_t alignment) { 173 _header->populate(this, alignment); 174 } 175 176 void FileMapHeader::populate(FileMapInfo* mapinfo, size_t alignment) { 177 _magic = CDS_ARCHIVE_MAGIC; 178 _version = CURRENT_CDS_ARCHIVE_VERSION; 179 _alignment = alignment; 180 _obj_alignment = ObjectAlignmentInBytes; 181 _compact_strings = CompactStrings; 182 _narrow_oop_mode = Universe::narrow_oop_mode(); 183 _narrow_oop_base = Universe::narrow_oop_base(); 184 _narrow_oop_shift = Universe::narrow_oop_shift(); 185 _max_heap_size = MaxHeapSize; 186 _narrow_klass_base = Universe::narrow_klass_base(); 187 _narrow_klass_shift = Universe::narrow_klass_shift(); 188 _shared_path_table_size = mapinfo->_shared_path_table_size; 189 _shared_path_table = mapinfo->_shared_path_table; 190 _shared_path_entry_size = mapinfo->_shared_path_entry_size; 191 192 // The following fields are for sanity checks for whether this archive 193 // will function correctly with this JVM and the bootclasspath it's 194 // invoked with. 195 196 // JVM version string ... changes on each build. 197 get_header_version(_jvm_ident); 198 199 ClassLoaderExt::finalize_shared_paths_misc_info(); 200 _app_class_paths_start_index = ClassLoaderExt::app_class_paths_start_index(); 201 _app_module_paths_start_index = ClassLoaderExt::app_module_paths_start_index(); 202 _max_used_path_index = ClassLoaderExt::max_used_path_index(); 203 204 _verify_local = BytecodeVerificationLocal; 205 _verify_remote = BytecodeVerificationRemote; 206 _has_platform_or_app_classes = ClassLoaderExt::has_platform_or_app_classes(); 207 } 208 209 void SharedClassPathEntry::init(const char* name, bool is_modules_image, TRAPS) { 210 assert(DumpSharedSpaces, "dump time only"); 211 _timestamp = 0; 212 _filesize = 0; 213 214 struct stat st; 215 if (os::stat(name, &st) == 0) { 216 if ((st.st_mode & S_IFMT) == S_IFDIR) { 217 _type = dir_entry; 218 } else { 219 // The timestamp of the modules_image is not checked at runtime. 220 if (is_modules_image) { 221 _type = modules_image_entry; 222 } else { 223 _type = jar_entry; 224 _timestamp = st.st_mtime; 225 } 226 _filesize = st.st_size; 227 } 228 } else { 229 // The file/dir must exist, or it would not have been added 230 // into ClassLoader::classpath_entry(). 231 // 232 // If we can't access a jar file in the boot path, then we can't 233 // make assumptions about where classes get loaded from. 234 FileMapInfo::fail_stop("Unable to open file %s.", name); 235 } 236 237 size_t len = strlen(name) + 1; 238 _name = MetadataFactory::new_array<char>(ClassLoaderData::the_null_class_loader_data(), (int)len, THREAD); 239 strcpy(_name->data(), name); 240 } 241 242 bool SharedClassPathEntry::validate(bool is_class_path) { 243 assert(UseSharedSpaces, "runtime only"); 244 245 struct stat st; 246 const char* name; 247 248 // In order to validate the runtime modules image file size against the archived 249 // size information, we need to obtain the runtime modules image path. The recorded 250 // dump time modules image path in the archive may be different from the runtime path 251 // if the JDK image has beed moved after generating the archive. 252 if (is_modules_image()) { 253 name = ClassLoader::get_jrt_entry()->name(); 254 } else { 255 name = this->name(); 256 } 257 258 bool ok = true; 259 log_info(class, path)("checking shared classpath entry: %s", name); 260 if (os::stat(name, &st) != 0 && is_class_path) { 261 // If the archived module path entry does not exist at runtime, it is not fatal 262 // (no need to invalid the shared archive) because the shared runtime visibility check 263 // filters out any archived module classes that do not have a matching runtime 264 // module path location. 265 FileMapInfo::fail_continue("Required classpath entry does not exist: %s", name); 266 ok = false; 267 } else if (is_dir()) { 268 if (!os::dir_is_empty(name)) { 269 FileMapInfo::fail_continue("directory is not empty: %s", name); 270 ok = false; 271 } 272 } else if ((has_timestamp() && _timestamp != st.st_mtime) || 273 _filesize != st.st_size) { 274 ok = false; 275 if (PrintSharedArchiveAndExit) { 276 FileMapInfo::fail_continue(_timestamp != st.st_mtime ? 277 "Timestamp mismatch" : 278 "File size mismatch"); 279 } else { 280 FileMapInfo::fail_continue("A jar file is not the one used while building" 281 " the shared archive file: %s", name); 282 } 283 } 284 return ok; 285 } 286 287 void SharedClassPathEntry::metaspace_pointers_do(MetaspaceClosure* it) { 288 it->push(&_name); 289 it->push(&_manifest); 290 } 291 292 void FileMapInfo::allocate_shared_path_table() { 293 assert(DumpSharedSpaces, "Sanity"); 294 295 Thread* THREAD = Thread::current(); 296 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 297 ClassPathEntry* jrt = ClassLoader::get_jrt_entry(); 298 299 assert(jrt != NULL, 300 "No modular java runtime image present when allocating the CDS classpath entry table"); 301 302 size_t entry_size = sizeof(SharedClassPathEntry); // assert ( should be 8 byte aligned??) 303 int num_boot_classpath_entries = ClassLoader::num_boot_classpath_entries(); 304 int num_app_classpath_entries = ClassLoader::num_app_classpath_entries(); 305 int num_module_path_entries = ClassLoader::num_module_path_entries(); 306 int num_entries = num_boot_classpath_entries + num_app_classpath_entries + num_module_path_entries; 307 size_t bytes = entry_size * num_entries; 308 309 _shared_path_table = MetadataFactory::new_array<u8>(loader_data, (int)(bytes + 7 / 8), THREAD); 310 _shared_path_table_size = num_entries; 311 _shared_path_entry_size = entry_size; 312 313 // 1. boot class path 314 int i = 0; 315 ClassPathEntry* cpe = jrt; 316 while (cpe != NULL) { 317 bool is_jrt = (cpe == jrt); 318 const char* type = (is_jrt ? "jrt" : (cpe->is_jar_file() ? "jar" : "dir")); 319 log_info(class, path)("add main shared path (%s) %s", type, cpe->name()); 320 SharedClassPathEntry* ent = shared_path(i); 321 ent->init(cpe->name(), is_jrt, THREAD); 322 if (!is_jrt) { // No need to do the modules image. 323 EXCEPTION_MARK; // The following call should never throw, but would exit VM on error. 324 update_shared_classpath(cpe, ent, THREAD); 325 } 326 cpe = ClassLoader::get_next_boot_classpath_entry(cpe); 327 i++; 328 } 329 assert(i == num_boot_classpath_entries, 330 "number of boot class path entry mismatch"); 331 332 // 2. app class path 333 ClassPathEntry *acpe = ClassLoader::app_classpath_entries(); 334 while (acpe != NULL) { 335 log_info(class, path)("add app shared path %s", acpe->name()); 336 SharedClassPathEntry* ent = shared_path(i); 337 ent->init(acpe->name(), false, THREAD); 338 EXCEPTION_MARK; 339 update_shared_classpath(acpe, ent, THREAD); 340 acpe = acpe->next(); 341 i++; 342 } 343 344 // 3. module path 345 ClassPathEntry *mpe = ClassLoader::module_path_entries(); 346 while (mpe != NULL) { 347 log_info(class, path)("add module path %s",mpe->name()); 348 SharedClassPathEntry* ent = shared_path(i); 349 ent->init(mpe->name(), false, THREAD); 350 EXCEPTION_MARK; 351 update_shared_classpath(mpe, ent, THREAD); 352 mpe = mpe->next(); 353 i++; 354 } 355 assert(i == num_entries, "number of shared path entry mismatch"); 356 } 357 358 void FileMapInfo::check_nonempty_dir_in_shared_path_table() { 359 assert(DumpSharedSpaces, "dump time only"); 360 361 bool has_nonempty_dir = false; 362 363 int last = _shared_path_table_size - 1; 364 if (last > ClassLoaderExt::max_used_path_index()) { 365 // no need to check any path beyond max_used_path_index 366 last = ClassLoaderExt::max_used_path_index(); 367 } 368 369 for (int i = 0; i <= last; i++) { 370 SharedClassPathEntry *e = shared_path(i); 371 if (e->is_dir()) { 372 const char* path = e->name(); 373 if (!os::dir_is_empty(path)) { 374 tty->print_cr("Error: non-empty directory '%s'", path); 375 has_nonempty_dir = true; 376 } 377 } 378 } 379 380 if (has_nonempty_dir) { 381 ClassLoader::exit_with_path_failure("Cannot have non-empty directory in paths", NULL); 382 } 383 } 384 385 class ManifestStream: public ResourceObj { 386 private: 387 u1* _buffer_start; // Buffer bottom 388 u1* _buffer_end; // Buffer top (one past last element) 389 u1* _current; // Current buffer position 390 391 public: 392 // Constructor 393 ManifestStream(u1* buffer, int length) : _buffer_start(buffer), 394 _current(buffer) { 395 _buffer_end = buffer + length; 396 } 397 398 static bool is_attr(u1* attr, const char* name) { 399 return strncmp((const char*)attr, name, strlen(name)) == 0; 400 } 401 402 static char* copy_attr(u1* value, size_t len) { 403 char* buf = NEW_RESOURCE_ARRAY(char, len + 1); 404 strncpy(buf, (char*)value, len); 405 buf[len] = 0; 406 return buf; 407 } 408 409 // The return value indicates if the JAR is signed or not 410 bool check_is_signed() { 411 u1* attr = _current; 412 bool isSigned = false; 413 while (_current < _buffer_end) { 414 if (*_current == '\n') { 415 *_current = '\0'; 416 u1* value = (u1*)strchr((char*)attr, ':'); 417 if (value != NULL) { 418 assert(*(value+1) == ' ', "Unrecognized format" ); 419 if (strstr((char*)attr, "-Digest") != NULL) { 420 isSigned = true; 421 break; 422 } 423 } 424 *_current = '\n'; // restore 425 attr = _current + 1; 426 } 427 _current ++; 428 } 429 return isSigned; 430 } 431 }; 432 433 void FileMapInfo::update_shared_classpath(ClassPathEntry *cpe, SharedClassPathEntry* ent, TRAPS) { 434 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 435 ResourceMark rm(THREAD); 436 jint manifest_size; 437 438 if (cpe->is_jar_file()) { 439 assert(ent->is_jar(), "the shared class path entry is not a JAR file"); 440 char* manifest = ClassLoaderExt::read_manifest(cpe, &manifest_size, CHECK); 441 if (manifest != NULL) { 442 ManifestStream* stream = new ManifestStream((u1*)manifest, 443 manifest_size); 444 if (stream->check_is_signed()) { 445 ent->set_is_signed(); 446 } else { 447 // Copy the manifest into the shared archive 448 manifest = ClassLoaderExt::read_raw_manifest(cpe, &manifest_size, CHECK); 449 Array<u1>* buf = MetadataFactory::new_array<u1>(loader_data, 450 manifest_size, 451 THREAD); 452 char* p = (char*)(buf->data()); 453 memcpy(p, manifest, manifest_size); 454 ent->set_manifest(buf); 455 } 456 } 457 } 458 } 459 460 461 bool FileMapInfo::validate_shared_path_table() { 462 assert(UseSharedSpaces, "runtime only"); 463 464 _validating_shared_path_table = true; 465 _shared_path_table = _header->_shared_path_table; 466 _shared_path_entry_size = _header->_shared_path_entry_size; 467 _shared_path_table_size = _header->_shared_path_table_size; 468 469 int module_paths_start_index = _header->_app_module_paths_start_index; 470 471 // validate the path entries up to the _max_used_path_index 472 for (int i=0; i < _header->_max_used_path_index + 1; i++) { 473 if (i < module_paths_start_index) { 474 if (shared_path(i)->validate()) { 475 log_info(class, path)("ok"); 476 } 477 } else if (i >= module_paths_start_index) { 478 if (shared_path(i)->validate(false /* not a class path entry */)) { 479 log_info(class, path)("ok"); 480 } 481 } else if (!PrintSharedArchiveAndExit) { 482 _validating_shared_path_table = false; 483 _shared_path_table = NULL; 484 _shared_path_table_size = 0; 485 return false; 486 } 487 } 488 489 _validating_shared_path_table = false; 490 return true; 491 } 492 493 // Read the FileMapInfo information from the file. 494 495 bool FileMapInfo::init_from_file(int fd) { 496 size_t sz = sizeof(FileMapHeader); 497 size_t n = os::read(fd, _header, (unsigned int)sz); 498 if (n != sz) { 499 fail_continue("Unable to read the file header."); 500 return false; 501 } 502 if (_header->_version != CURRENT_CDS_ARCHIVE_VERSION) { 503 fail_continue("The shared archive file has the wrong version."); 504 return false; 505 } 506 _file_offset = (long)n; 507 508 size_t info_size = _header->_paths_misc_info_size; 509 _paths_misc_info = NEW_C_HEAP_ARRAY_RETURN_NULL(char, info_size, mtClass); 510 if (_paths_misc_info == NULL) { 511 fail_continue("Unable to read the file header."); 512 return false; 513 } 514 n = os::read(fd, _paths_misc_info, (unsigned int)info_size); 515 if (n != info_size) { 516 fail_continue("Unable to read the shared path info header."); 517 FREE_C_HEAP_ARRAY(char, _paths_misc_info); 518 _paths_misc_info = NULL; 519 return false; 520 } 521 522 size_t len = lseek(fd, 0, SEEK_END); 523 CDSFileMapRegion* si = space_at(MetaspaceShared::last_valid_region); 524 // The last space might be empty 525 if (si->_file_offset > len || len - si->_file_offset < si->_used) { 526 fail_continue("The shared archive file has been truncated."); 527 return false; 528 } 529 530 _file_offset += (long)n; 531 return true; 532 } 533 534 535 // Read the FileMapInfo information from the file. 536 bool FileMapInfo::open_for_read() { 537 _full_path = Arguments::GetSharedArchivePath(); 538 int fd = os::open(_full_path, O_RDONLY | O_BINARY, 0); 539 if (fd < 0) { 540 if (errno == ENOENT) { 541 // Not locating the shared archive is ok. 542 fail_continue("Specified shared archive not found."); 543 } else { 544 fail_continue("Failed to open shared archive file (%s).", 545 os::strerror(errno)); 546 } 547 return false; 548 } 549 550 _fd = fd; 551 _file_open = true; 552 return true; 553 } 554 555 556 // Write the FileMapInfo information to the file. 557 558 void FileMapInfo::open_for_write() { 559 _full_path = Arguments::GetSharedArchivePath(); 560 LogMessage(cds) msg; 561 if (msg.is_info()) { 562 msg.info("Dumping shared data to file: "); 563 msg.info(" %s", _full_path); 564 } 565 566 #ifdef _WINDOWS // On Windows, need WRITE permission to remove the file. 567 chmod(_full_path, _S_IREAD | _S_IWRITE); 568 #endif 569 570 // Use remove() to delete the existing file because, on Unix, this will 571 // allow processes that have it open continued access to the file. 572 remove(_full_path); 573 int fd = os::open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0444); 574 if (fd < 0) { 575 fail_stop("Unable to create shared archive file %s: (%s).", _full_path, 576 os::strerror(errno)); 577 } 578 _fd = fd; 579 _file_offset = 0; 580 _file_open = true; 581 } 582 583 584 // Write the header to the file, seek to the next allocation boundary. 585 586 void FileMapInfo::write_header() { 587 int info_size = ClassLoader::get_shared_paths_misc_info_size(); 588 589 _header->_paths_misc_info_size = info_size; 590 591 align_file_position(); 592 write_bytes(_header, sizeof(FileMapHeader)); 593 write_bytes(ClassLoader::get_shared_paths_misc_info(), (size_t)info_size); 594 align_file_position(); 595 } 596 597 598 // Dump region to file. 599 600 void FileMapInfo::write_region(int region, char* base, size_t size, 601 bool read_only, bool allow_exec) { 602 CDSFileMapRegion* si = space_at(region); 603 604 if (_file_open) { 605 guarantee(si->_file_offset == _file_offset, "file offset mismatch."); 606 log_info(cds)("Shared file region %d: " SIZE_FORMAT_HEX_W(08) 607 " bytes, addr " INTPTR_FORMAT " file offset " SIZE_FORMAT_HEX_W(08), 608 region, size, p2i(base), _file_offset); 609 } else { 610 si->_file_offset = _file_offset; 611 } 612 if (MetaspaceShared::is_heap_region(region)) { 613 assert((base - (char*)Universe::narrow_oop_base()) % HeapWordSize == 0, "Sanity"); 614 if (base != NULL) { 615 si->_addr._offset = (intx)CompressedOops::encode_not_null((oop)base); 616 } else { 617 si->_addr._offset = 0; 618 } 619 } else { 620 si->_addr._base = base; 621 } 622 si->_used = size; 623 si->_read_only = read_only; 624 si->_allow_exec = allow_exec; 625 si->_crc = ClassLoader::crc32(0, base, (jint)size); 626 if (base != NULL) { 627 write_bytes_aligned(base, size); 628 } 629 } 630 631 // Write out the given archive heap memory regions. GC code combines multiple 632 // consecutive archive GC regions into one MemRegion whenever possible and 633 // produces the 'heap_mem' array. 634 // 635 // If the archive heap memory size is smaller than a single dump time GC region 636 // size, there is only one MemRegion in the array. 637 // 638 // If the archive heap memory size is bigger than one dump time GC region size, 639 // the 'heap_mem' array may contain more than one consolidated MemRegions. When 640 // the first/bottom archive GC region is a partial GC region (with the empty 641 // portion at the higher address within the region), one MemRegion is used for 642 // the bottom partial archive GC region. The rest of the consecutive archive 643 // GC regions are combined into another MemRegion. 644 // 645 // Here's the mapping from (archive heap GC regions) -> (GrowableArray<MemRegion> *regions). 646 // + We have 1 or more archive heap regions: ah0, ah1, ah2 ..... ahn 647 // + We have 1 or 2 consolidated heap memory regions: r0 and r1 648 // 649 // If there's a single archive GC region (ah0), then r0 == ah0, and r1 is empty. 650 // Otherwise: 651 // 652 // "X" represented space that's occupied by heap objects. 653 // "_" represented unused spaced in the heap region. 654 // 655 // 656 // |ah0 | ah1 | ah2| ...... | ahn | 657 // |XXXXXX|__ |XXXXX|XXXX|XXXXXXXX|XXXX| 658 // |<-r0->| |<- r1 ----------------->| 659 // ^^^ 660 // | 661 // +-- gap 662 size_t FileMapInfo::write_archive_heap_regions(GrowableArray<MemRegion> *heap_mem, 663 int first_region_id, int max_num_regions) { 664 assert(max_num_regions <= 2, "Only support maximum 2 memory regions"); 665 666 int arr_len = heap_mem == NULL ? 0 : heap_mem->length(); 667 if(arr_len > max_num_regions) { 668 fail_stop("Unable to write archive heap memory regions: " 669 "number of memory regions exceeds maximum due to fragmentation"); 670 } 671 672 size_t total_size = 0; 673 for (int i = first_region_id, arr_idx = 0; 674 i < first_region_id + max_num_regions; 675 i++, arr_idx++) { 676 char* start = NULL; 677 size_t size = 0; 678 if (arr_idx < arr_len) { 679 start = (char*)heap_mem->at(arr_idx).start(); 680 size = heap_mem->at(arr_idx).byte_size(); 681 total_size += size; 682 } 683 684 log_info(cds)("Archive heap region %d " INTPTR_FORMAT " - " INTPTR_FORMAT " = " SIZE_FORMAT_W(8) " bytes", 685 i, p2i(start), p2i(start + size), size); 686 write_region(i, start, size, false, false); 687 } 688 return total_size; 689 } 690 691 // Dump bytes to file -- at the current file position. 692 693 void FileMapInfo::write_bytes(const void* buffer, size_t nbytes) { 694 if (_file_open) { 695 size_t n = os::write(_fd, buffer, (unsigned int)nbytes); 696 if (n != nbytes) { 697 // It is dangerous to leave the corrupted shared archive file around, 698 // close and remove the file. See bug 6372906. 699 close(); 700 remove(_full_path); 701 fail_stop("Unable to write to shared archive file."); 702 } 703 } 704 _file_offset += nbytes; 705 } 706 707 708 // Align file position to an allocation unit boundary. 709 710 void FileMapInfo::align_file_position() { 711 size_t new_file_offset = align_up(_file_offset, 712 os::vm_allocation_granularity()); 713 if (new_file_offset != _file_offset) { 714 _file_offset = new_file_offset; 715 if (_file_open) { 716 // Seek one byte back from the target and write a byte to insure 717 // that the written file is the correct length. 718 _file_offset -= 1; 719 if (lseek(_fd, (long)_file_offset, SEEK_SET) < 0) { 720 fail_stop("Unable to seek."); 721 } 722 char zero = 0; 723 write_bytes(&zero, 1); 724 } 725 } 726 } 727 728 729 // Dump bytes to file -- at the current file position. 730 731 void FileMapInfo::write_bytes_aligned(const void* buffer, size_t nbytes) { 732 align_file_position(); 733 write_bytes(buffer, nbytes); 734 align_file_position(); 735 } 736 737 738 // Close the shared archive file. This does NOT unmap mapped regions. 739 740 void FileMapInfo::close() { 741 if (_file_open) { 742 if (::close(_fd) < 0) { 743 fail_stop("Unable to close the shared archive file."); 744 } 745 _file_open = false; 746 _fd = -1; 747 } 748 } 749 750 751 // JVM/TI RedefineClasses() support: 752 // Remap the shared readonly space to shared readwrite, private. 753 bool FileMapInfo::remap_shared_readonly_as_readwrite() { 754 int idx = MetaspaceShared::ro; 755 CDSFileMapRegion* si = space_at(idx); 756 if (!si->_read_only) { 757 // the space is already readwrite so we are done 758 return true; 759 } 760 size_t used = si->_used; 761 size_t size = align_up(used, os::vm_allocation_granularity()); 762 if (!open_for_read()) { 763 return false; 764 } 765 char *addr = _header->region_addr(idx); 766 char *base = os::remap_memory(_fd, _full_path, si->_file_offset, 767 addr, size, false /* !read_only */, 768 si->_allow_exec); 769 close(); 770 if (base == NULL) { 771 fail_continue("Unable to remap shared readonly space (errno=%d).", errno); 772 return false; 773 } 774 if (base != addr) { 775 fail_continue("Unable to remap shared readonly space at required address."); 776 return false; 777 } 778 si->_read_only = false; 779 return true; 780 } 781 782 // Map the whole region at once, assumed to be allocated contiguously. 783 ReservedSpace FileMapInfo::reserve_shared_memory() { 784 char* requested_addr = _header->region_addr(0); 785 size_t size = FileMapInfo::core_spaces_size(); 786 787 // Reserve the space first, then map otherwise map will go right over some 788 // other reserved memory (like the code cache). 789 ReservedSpace rs(size, os::vm_allocation_granularity(), false, requested_addr); 790 if (!rs.is_reserved()) { 791 fail_continue("Unable to reserve shared space at required address " 792 INTPTR_FORMAT, p2i(requested_addr)); 793 return rs; 794 } 795 // the reserved virtual memory is for mapping class data sharing archive 796 MemTracker::record_virtual_memory_type((address)rs.base(), mtClassShared); 797 798 return rs; 799 } 800 801 // Memory map a region in the address space. 802 static const char* shared_region_name[] = { "MiscData", "ReadWrite", "ReadOnly", "MiscCode", "OptionalData", 803 "String1", "String2", "OpenArchive1", "OpenArchive2" }; 804 805 char* FileMapInfo::map_region(int i, char** top_ret) { 806 assert(!MetaspaceShared::is_heap_region(i), "sanity"); 807 CDSFileMapRegion* si = space_at(i); 808 size_t used = si->_used; 809 size_t alignment = os::vm_allocation_granularity(); 810 size_t size = align_up(used, alignment); 811 char *requested_addr = _header->region_addr(i); 812 813 // If a tool agent is in use (debugging enabled), we must map the address space RW 814 if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space()) { 815 si->_read_only = false; 816 } 817 818 // map the contents of the CDS archive in this memory 819 char *base = os::map_memory(_fd, _full_path, si->_file_offset, 820 requested_addr, size, si->_read_only, 821 si->_allow_exec); 822 if (base == NULL || base != requested_addr) { 823 fail_continue("Unable to map %s shared space at required address.", shared_region_name[i]); 824 return NULL; 825 } 826 #ifdef _WINDOWS 827 // This call is Windows-only because the memory_type gets recorded for the other platforms 828 // in method FileMapInfo::reserve_shared_memory(), which is not called on Windows. 829 MemTracker::record_virtual_memory_type((address)base, mtClassShared); 830 #endif 831 832 833 if (!verify_region_checksum(i)) { 834 return NULL; 835 } 836 837 *top_ret = base + size; 838 return base; 839 } 840 841 static MemRegion *string_ranges = NULL; 842 static MemRegion *open_archive_heap_ranges = NULL; 843 static int num_string_ranges = 0; 844 static int num_open_archive_heap_ranges = 0; 845 846 #if INCLUDE_CDS_JAVA_HEAP 847 // 848 // Map the shared string objects and open archive heap objects to the runtime 849 // java heap. 850 // 851 // The shared strings are mapped near the runtime java heap top. The 852 // mapped strings contain no out-going references to any other java heap 853 // regions. GC does not write into the mapped shared strings. 854 // 855 // The open archive heap objects are mapped below the shared strings in 856 // the runtime java heap. The mapped open archive heap data only contain 857 // references to the shared strings and open archive objects initially. 858 // During runtime execution, out-going references to any other java heap 859 // regions may be added. GC may mark and update references in the mapped 860 // open archive objects. 861 void FileMapInfo::map_heap_regions() { 862 if (MetaspaceShared::is_heap_object_archiving_allowed()) { 863 log_info(cds)("Archived narrow_oop_mode = %d, narrow_oop_base = " PTR_FORMAT ", narrow_oop_shift = %d", 864 narrow_oop_mode(), p2i(narrow_oop_base()), narrow_oop_shift()); 865 log_info(cds)("Archived narrow_klass_base = " PTR_FORMAT ", narrow_klass_shift = %d", 866 p2i(narrow_klass_base()), narrow_klass_shift()); 867 868 // Check that all the narrow oop and klass encodings match the archive 869 if (narrow_oop_mode() != Universe::narrow_oop_mode() || 870 narrow_oop_base() != Universe::narrow_oop_base() || 871 narrow_oop_shift() != Universe::narrow_oop_shift() || 872 narrow_klass_base() != Universe::narrow_klass_base() || 873 narrow_klass_shift() != Universe::narrow_klass_shift()) { 874 if (log_is_enabled(Info, cds) && space_at(MetaspaceShared::first_string)->_used > 0) { 875 log_info(cds)("Cached heap data from the CDS archive is being ignored. " 876 "The current CompressedOops/CompressedClassPointers encoding differs from " 877 "that archived due to heap size change. The archive was dumped using max heap " 878 "size " UINTX_FORMAT "M.", max_heap_size()/M); 879 log_info(cds)("Current narrow_oop_mode = %d, narrow_oop_base = " PTR_FORMAT ", narrow_oop_shift = %d", 880 Universe::narrow_oop_mode(), p2i(Universe::narrow_oop_base()), 881 Universe::narrow_oop_shift()); 882 log_info(cds)("Current narrow_klass_base = " PTR_FORMAT ", narrow_klass_shift = %d", 883 p2i(Universe::narrow_klass_base()), Universe::narrow_klass_shift()); 884 } 885 } else { 886 // First, map string regions as closed archive heap regions. 887 // GC does not write into the regions. 888 if (map_heap_data(&string_ranges, 889 MetaspaceShared::first_string, 890 MetaspaceShared::max_strings, 891 &num_string_ranges)) { 892 StringTable::set_shared_string_mapped(); 893 894 // Now, map open_archive heap regions, GC can write into the regions. 895 if (map_heap_data(&open_archive_heap_ranges, 896 MetaspaceShared::first_open_archive_heap_region, 897 MetaspaceShared::max_open_archive_heap_region, 898 &num_open_archive_heap_ranges, 899 true /* open */)) { 900 MetaspaceShared::set_open_archive_heap_region_mapped(); 901 } 902 } 903 } 904 } else { 905 if (log_is_enabled(Info, cds) && space_at(MetaspaceShared::first_string)->_used > 0) { 906 log_info(cds)("Cached heap data from the CDS archive is being ignored. UseG1GC, " 907 "UseCompressedOops and UseCompressedClassPointers are required."); 908 } 909 } 910 911 if (!StringTable::shared_string_mapped()) { 912 assert(string_ranges == NULL && num_string_ranges == 0, "sanity"); 913 } 914 915 if (!MetaspaceShared::open_archive_heap_region_mapped()) { 916 assert(open_archive_heap_ranges == NULL && num_open_archive_heap_ranges == 0, "sanity"); 917 } 918 } 919 920 bool FileMapInfo::map_heap_data(MemRegion **heap_mem, int first, 921 int max, int* num, bool is_open_archive) { 922 MemRegion * regions = new MemRegion[max]; 923 CDSFileMapRegion* si; 924 int region_num = 0; 925 926 for (int i = first; 927 i < first + max; i++) { 928 si = space_at(i); 929 size_t used = si->_used; 930 if (used > 0) { 931 size_t size = used; 932 char* requested_addr = (char*)((void*)CompressedOops::decode_not_null( 933 (narrowOop)si->_addr._offset)); 934 regions[region_num] = MemRegion((HeapWord*)requested_addr, size / HeapWordSize); 935 region_num ++; 936 } 937 } 938 939 if (region_num == 0) { 940 return false; // no archived java heap data 941 } 942 943 // Check that ranges are within the java heap 944 if (!G1CollectedHeap::heap()->check_archive_addresses(regions, region_num)) { 945 log_info(cds)("UseSharedSpaces: Unable to allocate region, " 946 "range is not within java heap."); 947 return false; 948 } 949 950 // allocate from java heap 951 if (!G1CollectedHeap::heap()->alloc_archive_regions( 952 regions, region_num, is_open_archive)) { 953 log_info(cds)("UseSharedSpaces: Unable to allocate region, " 954 "java heap range is already in use."); 955 return false; 956 } 957 958 // Map the archived heap data. No need to call MemTracker::record_virtual_memory_type() 959 // for mapped regions as they are part of the reserved java heap, which is 960 // already recorded. 961 for (int i = 0; i < region_num; i++) { 962 si = space_at(first + i); 963 char* addr = (char*)regions[i].start(); 964 char* base = os::map_memory(_fd, _full_path, si->_file_offset, 965 addr, regions[i].byte_size(), si->_read_only, 966 si->_allow_exec); 967 if (base == NULL || base != addr) { 968 // dealloc the regions from java heap 969 dealloc_archive_heap_regions(regions, region_num, is_open_archive); 970 log_info(cds)("UseSharedSpaces: Unable to map at required address in java heap."); 971 return false; 972 } 973 } 974 975 if (!verify_mapped_heap_regions(first, region_num)) { 976 // dealloc the regions from java heap 977 dealloc_archive_heap_regions(regions, region_num, is_open_archive); 978 log_info(cds)("UseSharedSpaces: mapped heap regions are corrupt"); 979 return false; 980 } 981 982 // the shared heap data is mapped successfully 983 *heap_mem = regions; 984 *num = region_num; 985 return true; 986 } 987 988 bool FileMapInfo::verify_mapped_heap_regions(int first, int num) { 989 assert(num > 0, "sanity"); 990 for (int i = first; i < first + num; i++) { 991 if (!verify_region_checksum(i)) { 992 return false; 993 } 994 } 995 return true; 996 } 997 998 void FileMapInfo::fixup_mapped_heap_regions() { 999 // If any string regions were found, call the fill routine to make them parseable. 1000 // Note that string_ranges may be non-NULL even if no ranges were found. 1001 if (num_string_ranges != 0) { 1002 assert(string_ranges != NULL, "Null string_ranges array with non-zero count"); 1003 G1CollectedHeap::heap()->fill_archive_regions(string_ranges, num_string_ranges); 1004 } 1005 1006 // do the same for mapped open archive heap regions 1007 if (num_open_archive_heap_ranges != 0) { 1008 assert(open_archive_heap_ranges != NULL, "NULL open_archive_heap_ranges array with non-zero count"); 1009 G1CollectedHeap::heap()->fill_archive_regions(open_archive_heap_ranges, 1010 num_open_archive_heap_ranges); 1011 } 1012 } 1013 1014 // dealloc the archive regions from java heap 1015 void FileMapInfo::dealloc_archive_heap_regions(MemRegion* regions, int num, bool is_open) { 1016 if (num > 0) { 1017 assert(regions != NULL, "Null archive ranges array with non-zero count"); 1018 G1CollectedHeap::heap()->dealloc_archive_regions(regions, num, is_open); 1019 } 1020 } 1021 #endif // INCLUDE_CDS_JAVA_HEAP 1022 1023 bool FileMapInfo::verify_region_checksum(int i) { 1024 assert(i >= 0 && i < MetaspaceShared::n_regions, "invalid region"); 1025 if (!VerifySharedSpaces) { 1026 return true; 1027 } 1028 1029 size_t sz = space_at(i)->_used; 1030 1031 if (sz == 0) { 1032 return true; // no data 1033 } 1034 if ((MetaspaceShared::is_string_region(i) && 1035 !StringTable::shared_string_mapped()) || 1036 (MetaspaceShared::is_open_archive_heap_region(i) && 1037 !MetaspaceShared::open_archive_heap_region_mapped())) { 1038 return true; // archived heap data is not mapped 1039 } 1040 const char* buf = _header->region_addr(i); 1041 int crc = ClassLoader::crc32(0, buf, (jint)sz); 1042 if (crc != space_at(i)->_crc) { 1043 fail_continue("Checksum verification failed."); 1044 return false; 1045 } 1046 return true; 1047 } 1048 1049 // Unmap a memory region in the address space. 1050 1051 void FileMapInfo::unmap_region(int i) { 1052 assert(!MetaspaceShared::is_heap_region(i), "sanity"); 1053 CDSFileMapRegion* si = space_at(i); 1054 size_t used = si->_used; 1055 size_t size = align_up(used, os::vm_allocation_granularity()); 1056 1057 if (used == 0) { 1058 return; 1059 } 1060 1061 char* addr = _header->region_addr(i); 1062 if (!os::unmap_memory(addr, size)) { 1063 fail_stop("Unable to unmap shared space."); 1064 } 1065 } 1066 1067 void FileMapInfo::assert_mark(bool check) { 1068 if (!check) { 1069 fail_stop("Mark mismatch while restoring from shared file."); 1070 } 1071 } 1072 1073 void FileMapInfo::metaspace_pointers_do(MetaspaceClosure* it) { 1074 it->push(&_shared_path_table); 1075 for (int i=0; i<_shared_path_table_size; i++) { 1076 shared_path(i)->metaspace_pointers_do(it); 1077 } 1078 } 1079 1080 1081 FileMapInfo* FileMapInfo::_current_info = NULL; 1082 Array<u8>* FileMapInfo::_shared_path_table = NULL; 1083 int FileMapInfo::_shared_path_table_size = 0; 1084 size_t FileMapInfo::_shared_path_entry_size = 0x1234baad; 1085 bool FileMapInfo::_validating_shared_path_table = false; 1086 1087 // Open the shared archive file, read and validate the header 1088 // information (version, boot classpath, etc.). If initialization 1089 // fails, shared spaces are disabled and the file is closed. [See 1090 // fail_continue.] 1091 // 1092 // Validation of the archive is done in two steps: 1093 // 1094 // [1] validate_header() - done here. This checks the header, including _paths_misc_info. 1095 // [2] validate_shared_path_table - this is done later, because the table is in the RW 1096 // region of the archive, which is not mapped yet. 1097 bool FileMapInfo::initialize() { 1098 assert(UseSharedSpaces, "UseSharedSpaces expected."); 1099 1100 if (!open_for_read()) { 1101 return false; 1102 } 1103 1104 init_from_file(_fd); 1105 if (!validate_header()) { 1106 return false; 1107 } 1108 return true; 1109 } 1110 1111 char* FileMapHeader::region_addr(int idx) { 1112 if (MetaspaceShared::is_heap_region(idx)) { 1113 return _space[idx]._used > 0 ? 1114 (char*)((void*)CompressedOops::decode_not_null((narrowOop)_space[idx]._addr._offset)) : NULL; 1115 } else { 1116 return _space[idx]._addr._base; 1117 } 1118 } 1119 1120 int FileMapHeader::compute_crc() { 1121 char* start = (char*)this; 1122 // start computing from the field after _crc 1123 char* buf = (char*)&_crc + sizeof(_crc); 1124 size_t sz = sizeof(FileMapHeader) - (buf - start); 1125 int crc = ClassLoader::crc32(0, buf, (jint)sz); 1126 return crc; 1127 } 1128 1129 // This function should only be called during run time with UseSharedSpaces enabled. 1130 bool FileMapHeader::validate() { 1131 if (VerifySharedSpaces && compute_crc() != _crc) { 1132 FileMapInfo::fail_continue("Header checksum verification failed."); 1133 return false; 1134 } 1135 1136 if (!Arguments::has_jimage()) { 1137 FileMapInfo::fail_continue("The shared archive file cannot be used with an exploded module build."); 1138 return false; 1139 } 1140 1141 if (_version != CURRENT_CDS_ARCHIVE_VERSION) { 1142 FileMapInfo::fail_continue("The shared archive file is the wrong version."); 1143 return false; 1144 } 1145 if (_magic != CDS_ARCHIVE_MAGIC) { 1146 FileMapInfo::fail_continue("The shared archive file has a bad magic number."); 1147 return false; 1148 } 1149 char header_version[JVM_IDENT_MAX]; 1150 get_header_version(header_version); 1151 if (strncmp(_jvm_ident, header_version, JVM_IDENT_MAX-1) != 0) { 1152 log_info(class, path)("expected: %s", header_version); 1153 log_info(class, path)("actual: %s", _jvm_ident); 1154 FileMapInfo::fail_continue("The shared archive file was created by a different" 1155 " version or build of HotSpot"); 1156 return false; 1157 } 1158 if (_obj_alignment != ObjectAlignmentInBytes) { 1159 FileMapInfo::fail_continue("The shared archive file's ObjectAlignmentInBytes of %d" 1160 " does not equal the current ObjectAlignmentInBytes of " INTX_FORMAT ".", 1161 _obj_alignment, ObjectAlignmentInBytes); 1162 return false; 1163 } 1164 if (_compact_strings != CompactStrings) { 1165 FileMapInfo::fail_continue("The shared archive file's CompactStrings setting (%s)" 1166 " does not equal the current CompactStrings setting (%s).", 1167 _compact_strings ? "enabled" : "disabled", 1168 CompactStrings ? "enabled" : "disabled"); 1169 return false; 1170 } 1171 1172 // This must be done after header validation because it might change the 1173 // header data 1174 const char* prop = Arguments::get_property("java.system.class.loader"); 1175 if (prop != NULL) { 1176 warning("Archived non-system classes are disabled because the " 1177 "java.system.class.loader property is specified (value = \"%s\"). " 1178 "To use archived non-system classes, this property must be not be set", prop); 1179 _has_platform_or_app_classes = false; 1180 } 1181 1182 // For backwards compatibility, we don't check the verification setting 1183 // if the archive only contains system classes. 1184 if (_has_platform_or_app_classes && 1185 ((!_verify_local && BytecodeVerificationLocal) || 1186 (!_verify_remote && BytecodeVerificationRemote))) { 1187 FileMapInfo::fail_continue("The shared archive file was created with less restrictive " 1188 "verification setting than the current setting."); 1189 return false; 1190 } 1191 1192 return true; 1193 } 1194 1195 bool FileMapInfo::validate_header() { 1196 bool status = _header->validate(); 1197 1198 if (status) { 1199 if (!ClassLoader::check_shared_paths_misc_info(_paths_misc_info, _header->_paths_misc_info_size)) { 1200 if (!PrintSharedArchiveAndExit) { 1201 fail_continue("shared class paths mismatch (hint: enable -Xlog:class+path=info to diagnose the failure)"); 1202 status = false; 1203 } 1204 } 1205 } 1206 1207 if (_paths_misc_info != NULL) { 1208 FREE_C_HEAP_ARRAY(char, _paths_misc_info); 1209 _paths_misc_info = NULL; 1210 } 1211 return status; 1212 } 1213 1214 // Check if a given address is within one of the shared regions 1215 bool FileMapInfo::is_in_shared_region(const void* p, int idx) { 1216 assert(idx == MetaspaceShared::ro || 1217 idx == MetaspaceShared::rw || 1218 idx == MetaspaceShared::mc || 1219 idx == MetaspaceShared::md, "invalid region index"); 1220 char* base = _header->region_addr(idx); 1221 if (p >= base && p < base + space_at(idx)->_used) { 1222 return true; 1223 } 1224 return false; 1225 } 1226 1227 void FileMapInfo::print_shared_spaces() { 1228 tty->print_cr("Shared Spaces:"); 1229 for (int i = 0; i < MetaspaceShared::n_regions; i++) { 1230 CDSFileMapRegion* si = space_at(i); 1231 char *base = _header->region_addr(i); 1232 tty->print(" %s " INTPTR_FORMAT "-" INTPTR_FORMAT, 1233 shared_region_name[i], 1234 p2i(base), p2i(base + si->_used)); 1235 } 1236 } 1237 1238 // Unmap mapped regions of shared space. 1239 void FileMapInfo::stop_sharing_and_unmap(const char* msg) { 1240 MetaspaceObj::set_shared_metaspace_range(NULL, NULL); 1241 1242 FileMapInfo *map_info = FileMapInfo::current_info(); 1243 if (map_info) { 1244 map_info->fail_continue("%s", msg); 1245 for (int i = 0; i < MetaspaceShared::num_non_heap_spaces; i++) { 1246 char *addr = map_info->_header->region_addr(i); 1247 if (addr != NULL && !MetaspaceShared::is_heap_region(i)) { 1248 map_info->unmap_region(i); 1249 map_info->space_at(i)->_addr._base = NULL; 1250 } 1251 } 1252 // Dealloc the archive heap regions only without unmapping. The regions are part 1253 // of the java heap. Unmapping of the heap regions are managed by GC. 1254 map_info->dealloc_archive_heap_regions(open_archive_heap_ranges, 1255 num_open_archive_heap_ranges, 1256 true); 1257 map_info->dealloc_archive_heap_regions(string_ranges, 1258 num_string_ranges, 1259 false); 1260 } else if (DumpSharedSpaces) { 1261 fail_stop("%s", msg); 1262 } 1263 }