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/heapShared.inline.hpp" 39 #include "memory/iterator.inline.hpp" 40 #include "memory/metadataFactory.hpp" 41 #include "memory/metaspaceClosure.hpp" 42 #include "memory/metaspaceShared.hpp" 43 #include "memory/oopFactory.hpp" 44 #include "oops/compressedOops.inline.hpp" 45 #include "oops/objArrayOop.hpp" 46 #include "oops/oop.inline.hpp" 47 #include "prims/jvmtiExport.hpp" 48 #include "runtime/arguments.hpp" 49 #include "runtime/java.hpp" 50 #include "runtime/os.hpp" 51 #include "runtime/vm_version.hpp" 52 #include "services/memTracker.hpp" 53 #include "utilities/align.hpp" 54 #include "utilities/defaultStream.hpp" 55 #if INCLUDE_G1GC 56 #include "gc/g1/g1CollectedHeap.hpp" 57 #endif 58 59 # include <sys/stat.h> 60 # include <errno.h> 61 62 #ifndef O_BINARY // if defined (Win32) use binary files. 63 #define O_BINARY 0 // otherwise do nothing. 64 #endif 65 66 extern address JVM_FunctionAtStart(); 67 extern address JVM_FunctionAtEnd(); 68 69 // Complain and stop. All error conditions occurring during the writing of 70 // an archive file should stop the process. Unrecoverable errors during 71 // the reading of the archive file should stop the process. 72 73 static void fail(const char *msg, va_list ap) { 74 // This occurs very early during initialization: tty is not initialized. 75 jio_fprintf(defaultStream::error_stream(), 76 "An error has occurred while processing the" 77 " shared archive file.\n"); 78 jio_vfprintf(defaultStream::error_stream(), msg, ap); 79 jio_fprintf(defaultStream::error_stream(), "\n"); 80 // Do not change the text of the below message because some tests check for it. 81 vm_exit_during_initialization("Unable to use shared archive.", NULL); 82 } 83 84 85 void FileMapInfo::fail_stop(const char *msg, ...) { 86 va_list ap; 87 va_start(ap, msg); 88 fail(msg, ap); // Never returns. 89 va_end(ap); // for completeness. 90 } 91 92 93 // Complain and continue. Recoverable errors during the reading of the 94 // archive file may continue (with sharing disabled). 95 // 96 // If we continue, then disable shared spaces and close the file. 97 98 void FileMapInfo::fail_continue(const char *msg, ...) { 99 va_list ap; 100 va_start(ap, msg); 101 MetaspaceShared::set_archive_loading_failed(); 102 if (PrintSharedArchiveAndExit && _validating_shared_path_table) { 103 // If we are doing PrintSharedArchiveAndExit and some of the classpath entries 104 // do not validate, we can still continue "limping" to validate the remaining 105 // entries. No need to quit. 106 tty->print("["); 107 tty->vprint(msg, ap); 108 tty->print_cr("]"); 109 } else { 110 if (RequireSharedSpaces) { 111 fail(msg, ap); 112 } else { 113 if (log_is_enabled(Info, cds)) { 114 ResourceMark rm; 115 LogStream ls(Log(cds)::info()); 116 ls.print("UseSharedSpaces: "); 117 ls.vprint_cr(msg, ap); 118 } 119 } 120 UseSharedSpaces = false; 121 assert(current_info() != NULL, "singleton must be registered"); 122 current_info()->close(); 123 } 124 va_end(ap); 125 } 126 127 // Fill in the fileMapInfo structure with data about this VM instance. 128 129 // This method copies the vm version info into header_version. If the version is too 130 // long then a truncated version, which has a hash code appended to it, is copied. 131 // 132 // Using a template enables this method to verify that header_version is an array of 133 // length JVM_IDENT_MAX. This ensures that the code that writes to the CDS file and 134 // the code that reads the CDS file will both use the same size buffer. Hence, will 135 // use identical truncation. This is necessary for matching of truncated versions. 136 template <int N> static void get_header_version(char (&header_version) [N]) { 137 assert(N == JVM_IDENT_MAX, "Bad header_version size"); 138 139 const char *vm_version = VM_Version::internal_vm_info_string(); 140 const int version_len = (int)strlen(vm_version); 141 142 if (version_len < (JVM_IDENT_MAX-1)) { 143 strcpy(header_version, vm_version); 144 145 } else { 146 // Get the hash value. Use a static seed because the hash needs to return the same 147 // value over multiple jvm invocations. 148 unsigned int hash = AltHashing::murmur3_32(8191, (const jbyte*)vm_version, version_len); 149 150 // Truncate the ident, saving room for the 8 hex character hash value. 151 strncpy(header_version, vm_version, JVM_IDENT_MAX-9); 152 153 // Append the hash code as eight hex digits. 154 sprintf(&header_version[JVM_IDENT_MAX-9], "%08x", hash); 155 header_version[JVM_IDENT_MAX-1] = 0; // Null terminate. 156 } 157 } 158 159 FileMapInfo::FileMapInfo() { 160 assert(_current_info == NULL, "must be singleton"); // not thread safe 161 _current_info = this; 162 memset((void*)this, 0, sizeof(FileMapInfo)); 163 _file_offset = 0; 164 _file_open = false; 165 _header = new FileMapHeader(); 166 _header->_version = _invalid_version; 167 _header->_has_platform_or_app_classes = true; 168 } 169 170 FileMapInfo::~FileMapInfo() { 171 assert(_current_info == this, "must be singleton"); // not thread safe 172 _current_info = NULL; 173 } 174 175 void FileMapInfo::populate_header(size_t alignment) { 176 _header->populate(this, alignment); 177 } 178 179 void FileMapInfo::FileMapHeader::populate(FileMapInfo* mapinfo, size_t alignment) { 180 _magic = 0xf00baba2; 181 _version = _current_version; 182 _alignment = alignment; 183 _obj_alignment = ObjectAlignmentInBytes; 184 _compact_strings = CompactStrings; 185 _narrow_oop_mode = Universe::narrow_oop_mode(); 186 _narrow_oop_base = Universe::narrow_oop_base(); 187 _narrow_oop_shift = Universe::narrow_oop_shift(); 188 _max_heap_size = MaxHeapSize; 189 _narrow_klass_base = Universe::narrow_klass_base(); 190 _narrow_klass_shift = Universe::narrow_klass_shift(); 191 _shared_path_table_size = mapinfo->_shared_path_table_size; 192 _shared_path_table = mapinfo->_shared_path_table; 193 _shared_path_entry_size = mapinfo->_shared_path_entry_size; 194 if (MetaspaceShared::is_heap_object_archiving_allowed()) { 195 _g1_reserved = G1CollectedHeap::heap()->g1_reserved(); 196 } 197 198 // The following fields are for sanity checks for whether this archive 199 // will function correctly with this JVM and the bootclasspath it's 200 // invoked with. 201 202 // JVM version string ... changes on each build. 203 get_header_version(_jvm_ident); 204 205 ClassLoaderExt::finalize_shared_paths_misc_info(); 206 _app_class_paths_start_index = ClassLoaderExt::app_class_paths_start_index(); 207 _app_module_paths_start_index = ClassLoaderExt::app_module_paths_start_index(); 208 209 _verify_local = BytecodeVerificationLocal; 210 _verify_remote = BytecodeVerificationRemote; 211 _has_platform_or_app_classes = ClassLoaderExt::has_platform_or_app_classes(); 212 } 213 214 void SharedClassPathEntry::init(const char* name, bool is_modules_image, TRAPS) { 215 assert(DumpSharedSpaces, "dump time only"); 216 _timestamp = 0; 217 _filesize = 0; 218 219 struct stat st; 220 if (os::stat(name, &st) == 0) { 221 if ((st.st_mode & S_IFMT) == S_IFDIR) { 222 _type = dir_entry; 223 } else { 224 // The timestamp of the modules_image is not checked at runtime. 225 if (is_modules_image) { 226 _type = modules_image_entry; 227 } else { 228 _type = jar_entry; 229 _timestamp = st.st_mtime; 230 } 231 _filesize = st.st_size; 232 } 233 } else { 234 // The file/dir must exist, or it would not have been added 235 // into ClassLoader::classpath_entry(). 236 // 237 // If we can't access a jar file in the boot path, then we can't 238 // make assumptions about where classes get loaded from. 239 FileMapInfo::fail_stop("Unable to open file %s.", name); 240 } 241 242 size_t len = strlen(name) + 1; 243 _name = MetadataFactory::new_array<char>(ClassLoaderData::the_null_class_loader_data(), (int)len, THREAD); 244 strcpy(_name->data(), name); 245 } 246 247 bool SharedClassPathEntry::validate(bool is_class_path) { 248 assert(UseSharedSpaces, "runtime only"); 249 250 struct stat st; 251 const char* name; 252 253 // In order to validate the runtime modules image file size against the archived 254 // size information, we need to obtain the runtime modules image path. The recorded 255 // dump time modules image path in the archive may be different from the runtime path 256 // if the JDK image has beed moved after generating the archive. 257 if (is_modules_image()) { 258 name = ClassLoader::get_jrt_entry()->name(); 259 } else { 260 name = this->name(); 261 } 262 263 bool ok = true; 264 log_info(class, path)("checking shared classpath entry: %s", name); 265 if (os::stat(name, &st) != 0 && is_class_path) { 266 // If the archived module path entry does not exist at runtime, it is not fatal 267 // (no need to invalid the shared archive) because the shared runtime visibility check 268 // filters out any archived module classes that do not have a matching runtime 269 // module path location. 270 FileMapInfo::fail_continue("Required classpath entry does not exist: %s", name); 271 ok = false; 272 } else if (is_dir()) { 273 if (!os::dir_is_empty(name)) { 274 FileMapInfo::fail_continue("directory is not empty: %s", name); 275 ok = false; 276 } 277 } else if ((has_timestamp() && _timestamp != st.st_mtime) || 278 _filesize != st.st_size) { 279 ok = false; 280 if (PrintSharedArchiveAndExit) { 281 FileMapInfo::fail_continue(_timestamp != st.st_mtime ? 282 "Timestamp mismatch" : 283 "File size mismatch"); 284 } else { 285 FileMapInfo::fail_continue("A jar file is not the one used while building" 286 " the shared archive file: %s", name); 287 } 288 } 289 return ok; 290 } 291 292 void SharedClassPathEntry::metaspace_pointers_do(MetaspaceClosure* it) { 293 it->push(&_name); 294 it->push(&_manifest); 295 } 296 297 void FileMapInfo::allocate_shared_path_table() { 298 assert(DumpSharedSpaces, "Sanity"); 299 300 Thread* THREAD = Thread::current(); 301 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 302 ClassPathEntry* jrt = ClassLoader::get_jrt_entry(); 303 304 assert(jrt != NULL, 305 "No modular java runtime image present when allocating the CDS classpath entry table"); 306 307 size_t entry_size = sizeof(SharedClassPathEntry); // assert ( should be 8 byte aligned??) 308 int num_boot_classpath_entries = ClassLoader::num_boot_classpath_entries(); 309 int num_app_classpath_entries = ClassLoader::num_app_classpath_entries(); 310 int num_module_path_entries = ClassLoader::num_module_path_entries(); 311 int num_entries = num_boot_classpath_entries + num_app_classpath_entries + num_module_path_entries; 312 size_t bytes = entry_size * num_entries; 313 314 _shared_path_table = MetadataFactory::new_array<u8>(loader_data, (int)(bytes + 7 / 8), THREAD); 315 _shared_path_table_size = num_entries; 316 _shared_path_entry_size = entry_size; 317 318 // 1. boot class path 319 int i = 0; 320 ClassPathEntry* cpe = jrt; 321 while (cpe != NULL) { 322 bool is_jrt = (cpe == jrt); 323 const char* type = (is_jrt ? "jrt" : (cpe->is_jar_file() ? "jar" : "dir")); 324 log_info(class, path)("add main shared path (%s) %s", type, cpe->name()); 325 SharedClassPathEntry* ent = shared_path(i); 326 ent->init(cpe->name(), is_jrt, THREAD); 327 if (!is_jrt) { // No need to do the modules image. 328 EXCEPTION_MARK; // The following call should never throw, but would exit VM on error. 329 update_shared_classpath(cpe, ent, THREAD); 330 } 331 cpe = ClassLoader::get_next_boot_classpath_entry(cpe); 332 i++; 333 } 334 assert(i == num_boot_classpath_entries, 335 "number of boot class path entry mismatch"); 336 337 // 2. app class path 338 ClassPathEntry *acpe = ClassLoader::app_classpath_entries(); 339 while (acpe != NULL) { 340 log_info(class, path)("add app shared path %s", acpe->name()); 341 SharedClassPathEntry* ent = shared_path(i); 342 ent->init(acpe->name(), false, THREAD); 343 EXCEPTION_MARK; 344 update_shared_classpath(acpe, ent, THREAD); 345 acpe = acpe->next(); 346 i++; 347 } 348 349 // 3. module path 350 ClassPathEntry *mpe = ClassLoader::module_path_entries(); 351 while (mpe != NULL) { 352 log_info(class, path)("add module path %s",mpe->name()); 353 SharedClassPathEntry* ent = shared_path(i); 354 ent->init(mpe->name(), false, THREAD); 355 EXCEPTION_MARK; 356 update_shared_classpath(mpe, ent, THREAD); 357 mpe = mpe->next(); 358 i++; 359 } 360 assert(i == num_entries, "number of shared path entry mismatch"); 361 } 362 363 void FileMapInfo::check_nonempty_dir_in_shared_path_table() { 364 assert(DumpSharedSpaces, "dump time only"); 365 366 bool has_nonempty_dir = false; 367 368 int end = _shared_path_table_size; 369 if (!ClassLoaderExt::has_platform_or_app_classes()) { 370 // only check the boot path if no app class is loaded 371 end = ClassLoaderExt::app_class_paths_start_index(); 372 } 373 374 for (int i = 0; i < end; i++) { 375 SharedClassPathEntry *e = shared_path(i); 376 if (e->is_dir()) { 377 const char* path = e->name(); 378 if (!os::dir_is_empty(path)) { 379 tty->print_cr("Error: non-empty directory '%s'", path); 380 has_nonempty_dir = true; 381 } 382 } 383 } 384 385 if (has_nonempty_dir) { 386 ClassLoader::exit_with_path_failure("Cannot have non-empty directory in paths", NULL); 387 } 388 } 389 390 class ManifestStream: public ResourceObj { 391 private: 392 u1* _buffer_start; // Buffer bottom 393 u1* _buffer_end; // Buffer top (one past last element) 394 u1* _current; // Current buffer position 395 396 public: 397 // Constructor 398 ManifestStream(u1* buffer, int length) : _buffer_start(buffer), 399 _current(buffer) { 400 _buffer_end = buffer + length; 401 } 402 403 static bool is_attr(u1* attr, const char* name) { 404 return strncmp((const char*)attr, name, strlen(name)) == 0; 405 } 406 407 static char* copy_attr(u1* value, size_t len) { 408 char* buf = NEW_RESOURCE_ARRAY(char, len + 1); 409 strncpy(buf, (char*)value, len); 410 buf[len] = 0; 411 return buf; 412 } 413 414 // The return value indicates if the JAR is signed or not 415 bool check_is_signed() { 416 u1* attr = _current; 417 bool isSigned = false; 418 while (_current < _buffer_end) { 419 if (*_current == '\n') { 420 *_current = '\0'; 421 u1* value = (u1*)strchr((char*)attr, ':'); 422 if (value != NULL) { 423 assert(*(value+1) == ' ', "Unrecognized format" ); 424 if (strstr((char*)attr, "-Digest") != NULL) { 425 isSigned = true; 426 break; 427 } 428 } 429 *_current = '\n'; // restore 430 attr = _current + 1; 431 } 432 _current ++; 433 } 434 return isSigned; 435 } 436 }; 437 438 void FileMapInfo::update_shared_classpath(ClassPathEntry *cpe, SharedClassPathEntry* ent, TRAPS) { 439 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 440 ResourceMark rm(THREAD); 441 jint manifest_size; 442 443 if (cpe->is_jar_file()) { 444 assert(ent->is_jar(), "the shared class path entry is not a JAR file"); 445 char* manifest = ClassLoaderExt::read_manifest(cpe, &manifest_size, CHECK); 446 if (manifest != NULL) { 447 ManifestStream* stream = new ManifestStream((u1*)manifest, 448 manifest_size); 449 if (stream->check_is_signed()) { 450 ent->set_is_signed(); 451 } else { 452 // Copy the manifest into the shared archive 453 manifest = ClassLoaderExt::read_raw_manifest(cpe, &manifest_size, CHECK); 454 Array<u1>* buf = MetadataFactory::new_array<u1>(loader_data, 455 manifest_size, 456 THREAD); 457 char* p = (char*)(buf->data()); 458 memcpy(p, manifest, manifest_size); 459 ent->set_manifest(buf); 460 } 461 } 462 } 463 } 464 465 466 bool FileMapInfo::validate_shared_path_table() { 467 assert(UseSharedSpaces, "runtime only"); 468 469 _validating_shared_path_table = true; 470 _shared_path_table = _header->_shared_path_table; 471 _shared_path_entry_size = _header->_shared_path_entry_size; 472 _shared_path_table_size = _header->_shared_path_table_size; 473 474 int module_paths_start_index = _header->_app_module_paths_start_index; 475 476 // If the shared archive contain app or platform classes, validate all entries 477 // in the shared path table. Otherwise, only validate the boot path entries (with 478 // entry index < _app_class_paths_start_index). 479 int count = _header->has_platform_or_app_classes() ? 480 _shared_path_table_size : _header->_app_class_paths_start_index; 481 482 for (int i=0; i<count; i++) { 483 if (i < module_paths_start_index) { 484 if (shared_path(i)->validate()) { 485 log_info(class, path)("ok"); 486 } 487 } else if (i >= module_paths_start_index) { 488 if (shared_path(i)->validate(false /* not a class path entry */)) { 489 log_info(class, path)("ok"); 490 } 491 } else if (!PrintSharedArchiveAndExit) { 492 _validating_shared_path_table = false; 493 _shared_path_table = NULL; 494 _shared_path_table_size = 0; 495 return false; 496 } 497 } 498 499 _validating_shared_path_table = false; 500 return true; 501 } 502 503 // Read the FileMapInfo information from the file. 504 505 bool FileMapInfo::init_from_file(int fd) { 506 size_t sz = _header->data_size(); 507 char* addr = _header->data(); 508 size_t n = os::read(fd, addr, (unsigned int)sz); 509 if (n != sz) { 510 fail_continue("Unable to read the file header."); 511 return false; 512 } 513 if (_header->_version != current_version()) { 514 fail_continue("The shared archive file has the wrong version."); 515 return false; 516 } 517 _file_offset = (long)n; 518 519 size_t info_size = _header->_paths_misc_info_size; 520 _paths_misc_info = NEW_C_HEAP_ARRAY_RETURN_NULL(char, info_size, mtClass); 521 if (_paths_misc_info == NULL) { 522 fail_continue("Unable to read the file header."); 523 return false; 524 } 525 n = os::read(fd, _paths_misc_info, (unsigned int)info_size); 526 if (n != info_size) { 527 fail_continue("Unable to read the shared path info header."); 528 FREE_C_HEAP_ARRAY(char, _paths_misc_info); 529 _paths_misc_info = NULL; 530 return false; 531 } 532 533 size_t len = lseek(fd, 0, SEEK_END); 534 FileMapHeader::space_info* si = 535 &_header->_space[MetaspaceShared::last_valid_region]; 536 // The last space might be empty 537 if (si->_file_offset > len || len - si->_file_offset < si->_used) { 538 fail_continue("The shared archive file has been truncated."); 539 return false; 540 } 541 542 _file_offset += (long)n; 543 return true; 544 } 545 546 547 // Read the FileMapInfo information from the file. 548 bool FileMapInfo::open_for_read() { 549 _full_path = Arguments::GetSharedArchivePath(); 550 int fd = open(_full_path, O_RDONLY | O_BINARY, 0); 551 if (fd < 0) { 552 if (errno == ENOENT) { 553 // Not locating the shared archive is ok. 554 fail_continue("Specified shared archive not found."); 555 } else { 556 fail_continue("Failed to open shared archive file (%s).", 557 os::strerror(errno)); 558 } 559 return false; 560 } 561 562 _fd = fd; 563 _file_open = true; 564 return true; 565 } 566 567 568 // Write the FileMapInfo information to the file. 569 570 void FileMapInfo::open_for_write() { 571 _full_path = Arguments::GetSharedArchivePath(); 572 LogMessage(cds) msg; 573 if (msg.is_info()) { 574 msg.info("Dumping shared data to file: "); 575 msg.info(" %s", _full_path); 576 } 577 578 #ifdef _WINDOWS // On Windows, need WRITE permission to remove the file. 579 chmod(_full_path, _S_IREAD | _S_IWRITE); 580 #endif 581 582 // Use remove() to delete the existing file because, on Unix, this will 583 // allow processes that have it open continued access to the file. 584 remove(_full_path); 585 int fd = open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0444); 586 if (fd < 0) { 587 fail_stop("Unable to create shared archive file %s: (%s).", _full_path, 588 os::strerror(errno)); 589 } 590 _fd = fd; 591 _file_offset = 0; 592 _file_open = true; 593 } 594 595 596 // Write the header to the file, seek to the next allocation boundary. 597 598 void FileMapInfo::write_header() { 599 int info_size = ClassLoader::get_shared_paths_misc_info_size(); 600 601 _header->_paths_misc_info_size = info_size; 602 603 align_file_position(); 604 size_t sz = _header->data_size(); 605 char* addr = _header->data(); 606 write_bytes(addr, (int)sz); // skip the C++ vtable 607 write_bytes(ClassLoader::get_shared_paths_misc_info(), info_size); 608 align_file_position(); 609 } 610 611 612 // Dump region to file. 613 614 void FileMapInfo::write_region(int region, char* base, size_t size, 615 bool read_only, bool allow_exec) { 616 FileMapHeader::space_info* si = &_header->_space[region]; 617 618 if (_file_open) { 619 guarantee(si->_file_offset == _file_offset, "file offset mismatch."); 620 log_info(cds)("Shared file region %d: " SIZE_FORMAT_HEX_W(08) 621 " bytes, addr " INTPTR_FORMAT " file offset " SIZE_FORMAT_HEX_W(08), 622 region, size, p2i(base), _file_offset); 623 } else { 624 si->_file_offset = _file_offset; 625 } 626 if (MetaspaceShared::is_heap_region(region)) { 627 assert((base - (char*)Universe::narrow_oop_base()) % HeapWordSize == 0, "Sanity"); 628 if (base != NULL) { 629 si->_addr._offset = (intx)CompressedOops::encode_not_null((oop)base); 630 } else { 631 si->_addr._offset = 0; 632 } 633 } else { 634 si->_addr._base = base; 635 } 636 si->_used = size; 637 si->_read_only = read_only; 638 si->_allow_exec = allow_exec; 639 si->_crc = ClassLoader::crc32(0, base, (jint)size); 640 if (base != NULL) { 641 write_bytes_aligned(base, (int)size); 642 } 643 } 644 645 // Write out the given archive heap memory regions. GC code combines multiple 646 // consecutive archive GC regions into one MemRegion whenever possible and 647 // produces the 'heap_mem' array. 648 // 649 // If the archive heap memory size is smaller than a single dump time GC region 650 // size, there is only one MemRegion in the array. 651 // 652 // If the archive heap memory size is bigger than one dump time GC region size, 653 // the 'heap_mem' array may contain more than one consolidated MemRegions. When 654 // the first/bottom archive GC region is a partial GC region (with the empty 655 // portion at the higher address within the region), one MemRegion is used for 656 // the bottom partial archive GC region. The rest of the consecutive archive 657 // GC regions are combined into another MemRegion. 658 // 659 // Here's the mapping from (archive heap GC regions) -> (GrowableArray<MemRegion> *regions). 660 // + We have 1 or more archive heap regions: ah0, ah1, ah2 ..... ahn 661 // + We have 1 or 2 consolidated heap memory regions: r0 and r1 662 // 663 // If there's a single archive GC region (ah0), then r0 == ah0, and r1 is empty. 664 // Otherwise: 665 // 666 // "X" represented space that's occupied by heap objects. 667 // "_" represented unused spaced in the heap region. 668 // 669 // 670 // |ah0 | ah1 | ah2| ...... | ahn | 671 // |XXXXXX|__ |XXXXX|XXXX|XXXXXXXX|XXXX| 672 // |<-r0->| |<- r1 ----------------->| 673 // ^^^ 674 // | 675 // +-- gap 676 size_t FileMapInfo::write_archive_heap_regions(GrowableArray<MemRegion> *heap_mem, 677 int first_region_id, int max_num_regions) { 678 assert(max_num_regions <= 2, "Only support maximum 2 memory regions"); 679 680 int arr_len = heap_mem == NULL ? 0 : heap_mem->length(); 681 if(arr_len > max_num_regions) { 682 fail_stop("Unable to write archive heap memory regions: " 683 "number of memory regions exceeds maximum due to fragmentation"); 684 } 685 686 size_t total_size = 0; 687 for (int i = first_region_id, arr_idx = 0; 688 i < first_region_id + max_num_regions; 689 i++, arr_idx++) { 690 char* start = NULL; 691 size_t size = 0; 692 if (arr_idx < arr_len) { 693 start = (char*)heap_mem->at(arr_idx).start(); 694 size = heap_mem->at(arr_idx).byte_size(); 695 total_size += size; 696 } 697 698 log_info(cds)("Archive heap region %d " INTPTR_FORMAT " - " INTPTR_FORMAT " = " SIZE_FORMAT_W(8) " bytes", 699 i, p2i(start), p2i(start + size), size); 700 write_region(i, start, size, false, false); 701 } 702 return total_size; 703 } 704 705 // Dump bytes to file -- at the current file position. 706 707 void FileMapInfo::write_bytes(const void* buffer, int nbytes) { 708 if (_file_open) { 709 int n = ::write(_fd, buffer, nbytes); 710 if (n != nbytes) { 711 // It is dangerous to leave the corrupted shared archive file around, 712 // close and remove the file. See bug 6372906. 713 close(); 714 remove(_full_path); 715 fail_stop("Unable to write to shared archive file."); 716 } 717 } 718 _file_offset += nbytes; 719 } 720 721 722 // Align file position to an allocation unit boundary. 723 724 void FileMapInfo::align_file_position() { 725 size_t new_file_offset = align_up(_file_offset, 726 os::vm_allocation_granularity()); 727 if (new_file_offset != _file_offset) { 728 _file_offset = new_file_offset; 729 if (_file_open) { 730 // Seek one byte back from the target and write a byte to insure 731 // that the written file is the correct length. 732 _file_offset -= 1; 733 if (lseek(_fd, (long)_file_offset, SEEK_SET) < 0) { 734 fail_stop("Unable to seek."); 735 } 736 char zero = 0; 737 write_bytes(&zero, 1); 738 } 739 } 740 } 741 742 743 // Dump bytes to file -- at the current file position. 744 745 void FileMapInfo::write_bytes_aligned(const void* buffer, int nbytes) { 746 align_file_position(); 747 write_bytes(buffer, nbytes); 748 align_file_position(); 749 } 750 751 752 // Close the shared archive file. This does NOT unmap mapped regions. 753 754 void FileMapInfo::close() { 755 if (_file_open) { 756 if (::close(_fd) < 0) { 757 fail_stop("Unable to close the shared archive file."); 758 } 759 _file_open = false; 760 _fd = -1; 761 } 762 } 763 764 765 // JVM/TI RedefineClasses() support: 766 // Remap the shared readonly space to shared readwrite, private. 767 bool FileMapInfo::remap_shared_readonly_as_readwrite() { 768 int idx = MetaspaceShared::ro; 769 FileMapHeader::space_info* si = &_header->_space[idx]; 770 if (!si->_read_only) { 771 // the space is already readwrite so we are done 772 return true; 773 } 774 size_t used = si->_used; 775 size_t size = align_up(used, os::vm_allocation_granularity()); 776 if (!open_for_read()) { 777 return false; 778 } 779 char *addr = _header->region_addr(idx); 780 char *base = os::remap_memory(_fd, _full_path, si->_file_offset, 781 addr, size, false /* !read_only */, 782 si->_allow_exec); 783 close(); 784 if (base == NULL) { 785 fail_continue("Unable to remap shared readonly space (errno=%d).", errno); 786 return false; 787 } 788 if (base != addr) { 789 fail_continue("Unable to remap shared readonly space at required address."); 790 return false; 791 } 792 si->_read_only = false; 793 return true; 794 } 795 796 // Map the whole region at once, assumed to be allocated contiguously. 797 ReservedSpace FileMapInfo::reserve_shared_memory() { 798 char* requested_addr = _header->region_addr(0); 799 size_t size = FileMapInfo::core_spaces_size(); 800 801 // Reserve the space first, then map otherwise map will go right over some 802 // other reserved memory (like the code cache). 803 ReservedSpace rs(size, os::vm_allocation_granularity(), false, requested_addr); 804 if (!rs.is_reserved()) { 805 fail_continue("Unable to reserve shared space at required address " 806 INTPTR_FORMAT, p2i(requested_addr)); 807 return rs; 808 } 809 // the reserved virtual memory is for mapping class data sharing archive 810 MemTracker::record_virtual_memory_type((address)rs.base(), mtClassShared); 811 812 return rs; 813 } 814 815 // Memory map a region in the address space. 816 static const char* shared_region_name[] = { "MiscData", "ReadWrite", "ReadOnly", "MiscCode", "OptionalData", 817 "String1", "String2", "OpenArchive1", "OpenArchive2" }; 818 819 char* FileMapInfo::map_region(int i, char** top_ret) { 820 assert(!MetaspaceShared::is_heap_region(i), "sanity"); 821 FileMapHeader::space_info* si = &_header->_space[i]; 822 size_t used = si->_used; 823 size_t alignment = os::vm_allocation_granularity(); 824 size_t size = align_up(used, alignment); 825 char *requested_addr = _header->region_addr(i); 826 827 // If a tool agent is in use (debugging enabled), we must map the address space RW 828 if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space()) { 829 si->_read_only = false; 830 } 831 832 // map the contents of the CDS archive in this memory 833 char *base = os::map_memory(_fd, _full_path, si->_file_offset, 834 requested_addr, size, si->_read_only, 835 si->_allow_exec); 836 if (base == NULL || base != requested_addr) { 837 fail_continue("Unable to map %s shared space at required address.", shared_region_name[i]); 838 return NULL; 839 } 840 #ifdef _WINDOWS 841 // This call is Windows-only because the memory_type gets recorded for the other platforms 842 // in method FileMapInfo::reserve_shared_memory(), which is not called on Windows. 843 MemTracker::record_virtual_memory_type((address)base, mtClassShared); 844 #endif 845 846 847 if (!verify_region_checksum(i)) { 848 return NULL; 849 } 850 851 *top_ret = base + size; 852 return base; 853 } 854 855 static MemRegion *string_ranges = NULL; 856 static MemRegion *open_archive_heap_ranges = NULL; 857 static int num_string_ranges = 0; 858 static int num_open_archive_heap_ranges = 0; 859 860 #if INCLUDE_CDS_JAVA_HEAP 861 bool FileMapInfo::has_heap_regions() { 862 return (_header->_space[MetaspaceShared::first_string]._used > 0); 863 } 864 865 // 866 // Map the shared string objects and open archive heap objects to the runtime 867 // java heap. 868 // 869 // The shared strings are mapped near the runtime java heap top. The 870 // mapped strings contain no out-going references to any other java heap 871 // regions. GC does not write into the mapped shared strings. 872 // 873 // The open archive heap objects are mapped below the shared strings in 874 // the runtime java heap. The mapped open archive heap data only contain 875 // references to the shared strings and open archive objects initially. 876 // During runtime execution, out-going references to any other java heap 877 // regions may be added. GC may mark and update references in the mapped 878 // open archive objects. 879 void FileMapInfo::map_heap_regions_impl() { 880 if (!MetaspaceShared::is_heap_object_archiving_allowed()) { 881 log_info(cds)("Cached heap data from the CDS archive is being ignored. UseG1GC, " 882 "UseCompressedOops and UseCompressedClassPointers are required."); 883 return; 884 } 885 886 if (narrow_klass_base() != Universe::narrow_klass_base() || 887 narrow_klass_shift() != Universe::narrow_klass_shift()) { 888 log_info(cds)("Cached heap data from the CDS archive need to be relocated because"); 889 log_info(cds)("the CDS archive was created with an incompatible heap size: " UINTX_FORMAT "M.", max_heap_size()/M); 890 log_info(cds)("Current narrow_klass_base = " PTR_FORMAT ", narrow_klass_shift = %d", 891 p2i(Universe::narrow_klass_base()), Universe::narrow_klass_shift()); 892 return; 893 } 894 895 log_info(cds)("Archived narrow_oop_mode = %d, narrow_oop_base = " PTR_FORMAT ", narrow_oop_shift = %d", 896 narrow_oop_mode(), p2i(narrow_oop_base()), narrow_oop_shift()); 897 log_info(cds)("Archived narrow_klass_base = " PTR_FORMAT ", narrow_klass_shift = %d", 898 p2i(narrow_klass_base()), narrow_klass_shift()); 899 900 ptrdiff_t delta = 0; 901 902 if (narrow_oop_mode() != Universe::narrow_oop_mode() || 903 narrow_oop_base() != Universe::narrow_oop_base() || 904 narrow_oop_shift() != Universe::narrow_oop_shift()) { 905 log_info(cds)("Cached heap data from the CDS archive need to be relocated because"); 906 log_info(cds)("the CDS archive was created with an incompatible heap size: " UINTX_FORMAT "M.", max_heap_size()/M); 907 log_info(cds)("Current narrow_oop_mode = %d, narrow_oop_base = " PTR_FORMAT ", narrow_oop_shift = %d", 908 Universe::narrow_oop_mode(), p2i(Universe::narrow_oop_base()), 909 Universe::narrow_oop_shift()); 910 911 _heap_pointers_need_relocation = true; 912 913 // dumptime heap end ------------v 914 // [ |archived heap regions| ] runtime heap end ------v 915 // [ |archived heap regions| ] 916 // |<-----delta-------------------->| 917 // 918 // At dump time, the archived heap region were near the top of the heap. 919 // At run time, that region may not be inside the heap, so we move it so 920 // that it's now near the top of teh runtime time. This can be done by 921 // the simple math of adding the delta as shown above. 922 address dumptime_heap_end = (address)_header->_g1_reserved.end(); 923 address runtime_heap_end = (address)G1CollectedHeap::heap()->g1_reserved().end(); 924 delta = runtime_heap_end - dumptime_heap_end; 925 } 926 927 HeapShared::init_narrow_oop_decoding(narrow_oop_base() + delta, narrow_oop_shift()); 928 929 // First, map string regions as closed archive heap regions. 930 // GC does not write into the regions. 931 if (map_heap_data(&string_ranges, 932 MetaspaceShared::first_string, 933 MetaspaceShared::max_strings, 934 &num_string_ranges)) { 935 StringTable::set_shared_string_mapped(); 936 937 // Now, map open_archive heap regions, GC can write into the regions. 938 if (map_heap_data(&open_archive_heap_ranges, 939 MetaspaceShared::first_open_archive_heap_region, 940 MetaspaceShared::max_open_archive_heap_region, 941 &num_open_archive_heap_ranges, 942 true /* open */)) { 943 MetaspaceShared::set_open_archive_heap_region_mapped(); 944 } 945 } 946 } 947 948 void FileMapInfo::map_heap_regions() { 949 if (has_heap_regions()) { 950 map_heap_regions_impl(); 951 } 952 953 if (!StringTable::shared_string_mapped()) { 954 assert(string_ranges == NULL && num_string_ranges == 0, "sanity"); 955 } 956 957 if (!MetaspaceShared::open_archive_heap_region_mapped()) { 958 assert(open_archive_heap_ranges == NULL && num_open_archive_heap_ranges == 0, "sanity"); 959 } 960 } 961 962 bool FileMapInfo::map_heap_data(MemRegion **heap_mem, int first, 963 int max, int* num, bool is_open_archive) { 964 MemRegion * regions = new MemRegion[max]; 965 FileMapHeader::space_info* si; 966 int region_num = 0; 967 968 for (int i = first; 969 i < first + max; i++) { 970 si = &_header->_space[i]; 971 size_t size = si->_used; 972 if (size > 0) { 973 char* requested_addr = (char*)((void*)HeapShared::decode_not_null( 974 (narrowOop)si->_addr._offset)); 975 regions[region_num] = MemRegion((HeapWord*)requested_addr, size / HeapWordSize); 976 region_num ++; 977 } 978 } 979 980 if (region_num == 0) { 981 return false; // no archived java heap data 982 } 983 984 // Check that ranges are within the java heap 985 if (!G1CollectedHeap::heap()->check_archive_addresses(regions, region_num)) { 986 log_info(cds)("UseSharedSpaces: Unable to allocate region, " 987 "range is not within java heap."); 988 return false; 989 } 990 991 // allocate from java heap 992 if (!G1CollectedHeap::heap()->alloc_archive_regions( 993 regions, region_num, is_open_archive)) { 994 log_info(cds)("UseSharedSpaces: Unable to allocate region, " 995 "java heap range is already in use."); 996 return false; 997 } 998 999 // Map the archived heap data. No need to call MemTracker::record_virtual_memory_type() 1000 // for mapped regions as they are part of the reserved java heap, which is 1001 // already recorded. 1002 for (int i = 0; i < region_num; i++) { 1003 si = &_header->_space[first + i]; 1004 char* addr = (char*)regions[i].start(); 1005 char* base = os::map_memory(_fd, _full_path, si->_file_offset, 1006 addr, regions[i].byte_size(), si->_read_only, 1007 si->_allow_exec); 1008 if (base == NULL || base != addr) { 1009 // dealloc the regions from java heap 1010 dealloc_archive_heap_regions(regions, region_num); 1011 log_info(cds)("UseSharedSpaces: Unable to map at required address in java heap."); 1012 return false; 1013 } 1014 } 1015 1016 if (!verify_mapped_heap_regions(first, region_num)) { 1017 // dealloc the regions from java heap 1018 dealloc_archive_heap_regions(regions, region_num); 1019 log_info(cds)("UseSharedSpaces: mapped heap regions are corrupt"); 1020 return false; 1021 } 1022 1023 // the shared heap data is mapped successfully 1024 *heap_mem = regions; 1025 *num = region_num; 1026 return true; 1027 } 1028 1029 bool FileMapInfo::verify_mapped_heap_regions(int first, int num) { 1030 for (int i = first; 1031 i <= first + num; i++) { 1032 if (!verify_region_checksum(i)) { 1033 return false; 1034 } 1035 } 1036 return true; 1037 } 1038 1039 void FileMapInfo::relocate_archived_heap_embedded_pointers() { 1040 if (!_heap_pointers_need_relocation) { 1041 return; 1042 } 1043 1044 relocate_archived_heap_embedded_pointers_impl(string_ranges, 1045 num_string_ranges); 1046 1047 relocate_archived_heap_embedded_pointers_impl(open_archive_heap_ranges, 1048 num_open_archive_heap_ranges); 1049 } 1050 1051 class RelocateInternalPointers: public BasicOopIterateClosure { 1052 public: 1053 virtual bool should_verify_oops(void) { 1054 return false; 1055 } 1056 virtual void do_oop(narrowOop *p) { 1057 narrowOop v = *p; 1058 if (!CompressedOops::is_null(v)) { 1059 oop o = HeapShared::decode_not_null(v); 1060 RawAccess<IS_NOT_NULL>::oop_store(p, o); 1061 } 1062 } 1063 virtual void do_oop(oop *p) { 1064 ShouldNotReachHere(); 1065 } 1066 }; 1067 1068 void FileMapInfo::relocate_archived_heap_embedded_pointers_impl(MemRegion *heap_mem, int num) { 1069 RelocateInternalPointers relocator; 1070 1071 for (int i=0; i<num; i++) { 1072 HeapWord* p = heap_mem[i].start(); 1073 HeapWord* end = heap_mem[i].end(); 1074 while (p < end) { 1075 oop o = (oop)p; 1076 o->oop_iterate(&relocator); 1077 p += o->size(); 1078 } 1079 } 1080 } 1081 1082 // This internally allocates objects using SystemDictionary::Object_klass(), so it 1083 // must be called after the well-known classes are resolved. 1084 void FileMapInfo::fixup_mapped_heap_regions() { 1085 // If any string regions were found, call the fill routine to make them parseable. 1086 // Note that string_ranges may be non-NULL even if no ranges were found. 1087 if (num_string_ranges != 0) { 1088 assert(string_ranges != NULL, "Null string_ranges array with non-zero count"); 1089 G1CollectedHeap::heap()->fill_archive_regions(string_ranges, num_string_ranges); 1090 } 1091 1092 // do the same for mapped open archive heap regions 1093 if (num_open_archive_heap_ranges != 0) { 1094 assert(open_archive_heap_ranges != NULL, "NULL open_archive_heap_ranges array with non-zero count"); 1095 G1CollectedHeap::heap()->fill_archive_regions(open_archive_heap_ranges, 1096 num_open_archive_heap_ranges); 1097 } 1098 } 1099 1100 // dealloc the archive regions from java heap 1101 void FileMapInfo::dealloc_archive_heap_regions(MemRegion* regions, int num) { 1102 if (num > 0) { 1103 assert(regions != NULL, "Null archive ranges array with non-zero count"); 1104 G1CollectedHeap::heap()->dealloc_archive_regions(regions, num); 1105 } 1106 } 1107 #endif // INCLUDE_CDS_JAVA_HEAP 1108 1109 bool FileMapInfo::verify_region_checksum(int i) { 1110 if (!VerifySharedSpaces) { 1111 return true; 1112 } 1113 1114 size_t sz = _header->_space[i]._used; 1115 1116 if (sz == 0) { 1117 return true; // no data 1118 } 1119 if ((MetaspaceShared::is_string_region(i) && 1120 !StringTable::shared_string_mapped()) || 1121 (MetaspaceShared::is_open_archive_heap_region(i) && 1122 !MetaspaceShared::open_archive_heap_region_mapped())) { 1123 return true; // archived heap data is not mapped 1124 } 1125 const char* buf = _header->region_addr(i); 1126 int crc = ClassLoader::crc32(0, buf, (jint)sz); 1127 if (crc != _header->_space[i]._crc) { 1128 fail_continue("Checksum verification failed."); 1129 return false; 1130 } 1131 return true; 1132 } 1133 1134 // Unmap a memory region in the address space. 1135 1136 void FileMapInfo::unmap_region(int i) { 1137 assert(!MetaspaceShared::is_heap_region(i), "sanity"); 1138 FileMapHeader::space_info* si = &_header->_space[i]; 1139 size_t used = si->_used; 1140 size_t size = align_up(used, os::vm_allocation_granularity()); 1141 1142 if (used == 0) { 1143 return; 1144 } 1145 1146 char* addr = _header->region_addr(i); 1147 if (!os::unmap_memory(addr, size)) { 1148 fail_stop("Unable to unmap shared space."); 1149 } 1150 } 1151 1152 void FileMapInfo::assert_mark(bool check) { 1153 if (!check) { 1154 fail_stop("Mark mismatch while restoring from shared file."); 1155 } 1156 } 1157 1158 void FileMapInfo::metaspace_pointers_do(MetaspaceClosure* it) { 1159 it->push(&_shared_path_table); 1160 for (int i=0; i<_shared_path_table_size; i++) { 1161 shared_path(i)->metaspace_pointers_do(it); 1162 } 1163 } 1164 1165 1166 FileMapInfo* FileMapInfo::_current_info = NULL; 1167 bool FileMapInfo::_heap_pointers_need_relocation = false; 1168 Array<u8>* FileMapInfo::_shared_path_table = NULL; 1169 int FileMapInfo::_shared_path_table_size = 0; 1170 size_t FileMapInfo::_shared_path_entry_size = 0x1234baad; 1171 bool FileMapInfo::_validating_shared_path_table = false; 1172 1173 // Open the shared archive file, read and validate the header 1174 // information (version, boot classpath, etc.). If initialization 1175 // fails, shared spaces are disabled and the file is closed. [See 1176 // fail_continue.] 1177 // 1178 // Validation of the archive is done in two steps: 1179 // 1180 // [1] validate_header() - done here. This checks the header, including _paths_misc_info. 1181 // [2] validate_shared_path_table - this is done later, because the table is in the RW 1182 // region of the archive, which is not mapped yet. 1183 bool FileMapInfo::initialize() { 1184 assert(UseSharedSpaces, "UseSharedSpaces expected."); 1185 1186 if (!open_for_read()) { 1187 return false; 1188 } 1189 1190 init_from_file(_fd); 1191 if (!validate_header()) { 1192 return false; 1193 } 1194 return true; 1195 } 1196 1197 char* FileMapInfo::FileMapHeader::region_addr(int idx) { 1198 if (MetaspaceShared::is_heap_region(idx)) { 1199 return _space[idx]._used > 0 ? 1200 (char*)((void*)CompressedOops::decode_not_null((narrowOop)_space[idx]._addr._offset)) : NULL; 1201 } else { 1202 return _space[idx]._addr._base; 1203 } 1204 } 1205 1206 int FileMapInfo::FileMapHeader::compute_crc() { 1207 char* header = data(); 1208 // start computing from the field after _crc 1209 char* buf = (char*)&_crc + sizeof(int); 1210 size_t sz = data_size() - (buf - header); 1211 int crc = ClassLoader::crc32(0, buf, (jint)sz); 1212 return crc; 1213 } 1214 1215 // This function should only be called during run time with UseSharedSpaces enabled. 1216 bool FileMapInfo::FileMapHeader::validate() { 1217 if (VerifySharedSpaces && compute_crc() != _crc) { 1218 fail_continue("Header checksum verification failed."); 1219 return false; 1220 } 1221 1222 if (!Arguments::has_jimage()) { 1223 FileMapInfo::fail_continue("The shared archive file cannot be used with an exploded module build."); 1224 return false; 1225 } 1226 1227 if (_version != current_version()) { 1228 FileMapInfo::fail_continue("The shared archive file is the wrong version."); 1229 return false; 1230 } 1231 if (_magic != (int)0xf00baba2) { 1232 FileMapInfo::fail_continue("The shared archive file has a bad magic number."); 1233 return false; 1234 } 1235 char header_version[JVM_IDENT_MAX]; 1236 get_header_version(header_version); 1237 if (strncmp(_jvm_ident, header_version, JVM_IDENT_MAX-1) != 0) { 1238 log_info(class, path)("expected: %s", header_version); 1239 log_info(class, path)("actual: %s", _jvm_ident); 1240 FileMapInfo::fail_continue("The shared archive file was created by a different" 1241 " version or build of HotSpot"); 1242 return false; 1243 } 1244 if (_obj_alignment != ObjectAlignmentInBytes) { 1245 FileMapInfo::fail_continue("The shared archive file's ObjectAlignmentInBytes of %d" 1246 " does not equal the current ObjectAlignmentInBytes of " INTX_FORMAT ".", 1247 _obj_alignment, ObjectAlignmentInBytes); 1248 return false; 1249 } 1250 if (_compact_strings != CompactStrings) { 1251 FileMapInfo::fail_continue("The shared archive file's CompactStrings setting (%s)" 1252 " does not equal the current CompactStrings setting (%s).", 1253 _compact_strings ? "enabled" : "disabled", 1254 CompactStrings ? "enabled" : "disabled"); 1255 return false; 1256 } 1257 1258 // This must be done after header validation because it might change the 1259 // header data 1260 const char* prop = Arguments::get_property("java.system.class.loader"); 1261 if (prop != NULL) { 1262 warning("Archived non-system classes are disabled because the " 1263 "java.system.class.loader property is specified (value = \"%s\"). " 1264 "To use archived non-system classes, this property must be not be set", prop); 1265 _has_platform_or_app_classes = false; 1266 } 1267 1268 // For backwards compatibility, we don't check the verification setting 1269 // if the archive only contains system classes. 1270 if (_has_platform_or_app_classes && 1271 ((!_verify_local && BytecodeVerificationLocal) || 1272 (!_verify_remote && BytecodeVerificationRemote))) { 1273 FileMapInfo::fail_continue("The shared archive file was created with less restrictive " 1274 "verification setting than the current setting."); 1275 return false; 1276 } 1277 1278 return true; 1279 } 1280 1281 bool FileMapInfo::validate_header() { 1282 bool status = _header->validate(); 1283 1284 if (status) { 1285 if (!ClassLoader::check_shared_paths_misc_info(_paths_misc_info, _header->_paths_misc_info_size)) { 1286 if (!PrintSharedArchiveAndExit) { 1287 fail_continue("shared class paths mismatch (hint: enable -Xlog:class+path=info to diagnose the failure)"); 1288 status = false; 1289 } 1290 } 1291 } 1292 1293 if (_paths_misc_info != NULL) { 1294 FREE_C_HEAP_ARRAY(char, _paths_misc_info); 1295 _paths_misc_info = NULL; 1296 } 1297 return status; 1298 } 1299 1300 // Check if a given address is within one of the shared regions 1301 bool FileMapInfo::is_in_shared_region(const void* p, int idx) { 1302 assert(idx == MetaspaceShared::ro || 1303 idx == MetaspaceShared::rw || 1304 idx == MetaspaceShared::mc || 1305 idx == MetaspaceShared::md, "invalid region index"); 1306 char* base = _header->region_addr(idx); 1307 if (p >= base && p < base + _header->_space[idx]._used) { 1308 return true; 1309 } 1310 return false; 1311 } 1312 1313 void FileMapInfo::print_shared_spaces() { 1314 tty->print_cr("Shared Spaces:"); 1315 for (int i = 0; i < MetaspaceShared::n_regions; i++) { 1316 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i]; 1317 char *base = _header->region_addr(i); 1318 tty->print(" %s " INTPTR_FORMAT "-" INTPTR_FORMAT, 1319 shared_region_name[i], 1320 p2i(base), p2i(base + si->_used)); 1321 } 1322 } 1323 1324 // Unmap mapped regions of shared space. 1325 void FileMapInfo::stop_sharing_and_unmap(const char* msg) { 1326 FileMapInfo *map_info = FileMapInfo::current_info(); 1327 if (map_info) { 1328 map_info->fail_continue("%s", msg); 1329 for (int i = 0; i < MetaspaceShared::num_non_heap_spaces; i++) { 1330 char *addr = map_info->_header->region_addr(i); 1331 if (addr != NULL && !MetaspaceShared::is_heap_region(i)) { 1332 map_info->unmap_region(i); 1333 map_info->_header->_space[i]._addr._base = NULL; 1334 } 1335 } 1336 // Dealloc the archive heap regions only without unmapping. The regions are part 1337 // of the java heap. Unmapping of the heap regions are managed by GC. 1338 map_info->dealloc_archive_heap_regions(open_archive_heap_ranges, 1339 num_open_archive_heap_ranges); 1340 map_info->dealloc_archive_heap_regions(string_ranges, num_string_ranges); 1341 } else if (DumpSharedSpaces) { 1342 fail_stop("%s", msg); 1343 } 1344 }