1 /* 2 * Copyright (c) 2003, 2014, 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 "classfile/classLoader.hpp" 27 #include "classfile/sharedClassUtil.hpp" 28 #include "classfile/symbolTable.hpp" 29 #include "classfile/systemDictionaryShared.hpp" 30 #include "classfile/altHashing.hpp" 31 #include "memory/filemap.hpp" 32 #include "memory/metadataFactory.hpp" 33 #include "memory/oopFactory.hpp" 34 #include "oops/objArrayOop.hpp" 35 #include "runtime/arguments.hpp" 36 #include "runtime/java.hpp" 37 #include "runtime/os.hpp" 38 #include "runtime/vm_version.hpp" 39 #include "services/memTracker.hpp" 40 #include "utilities/defaultStream.hpp" 41 42 # include <sys/stat.h> 43 # include <errno.h> 44 45 #ifndef O_BINARY // if defined (Win32) use binary files. 46 #define O_BINARY 0 // otherwise do nothing. 47 #endif 48 49 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 50 extern address JVM_FunctionAtStart(); 51 extern address JVM_FunctionAtEnd(); 52 53 // Complain and stop. All error conditions occurring during the writing of 54 // an archive file should stop the process. Unrecoverable errors during 55 // the reading of the archive file should stop the process. 56 57 static void fail(const char *msg, va_list ap) { 58 // This occurs very early during initialization: tty is not initialized. 59 jio_fprintf(defaultStream::error_stream(), 60 "An error has occurred while processing the" 61 " shared archive file.\n"); 62 jio_vfprintf(defaultStream::error_stream(), msg, ap); 63 jio_fprintf(defaultStream::error_stream(), "\n"); 64 // Do not change the text of the below message because some tests check for it. 65 vm_exit_during_initialization("Unable to use shared archive.", NULL); 66 } 67 68 69 void FileMapInfo::fail_stop(const char *msg, ...) { 70 va_list ap; 71 va_start(ap, msg); 72 fail(msg, ap); // Never returns. 73 va_end(ap); // for completeness. 74 } 75 76 77 // Complain and continue. Recoverable errors during the reading of the 78 // archive file may continue (with sharing disabled). 79 // 80 // If we continue, then disable shared spaces and close the file. 81 82 void FileMapInfo::fail_continue(const char *msg, ...) { 83 va_list ap; 84 va_start(ap, msg); 85 MetaspaceShared::set_archive_loading_failed(); 86 if (PrintSharedArchiveAndExit && _validating_classpath_entry_table) { 87 // If we are doing PrintSharedArchiveAndExit and some of the classpath entries 88 // do not validate, we can still continue "limping" to validate the remaining 89 // entries. No need to quit. 90 tty->print("["); 91 tty->vprint(msg, ap); 92 tty->print_cr("]"); 93 } else { 94 if (RequireSharedSpaces) { 95 fail(msg, ap); 96 } else { 97 if (PrintSharedSpaces) { 98 tty->print_cr("UseSharedSpaces: %s", msg); 99 } 100 } 101 } 102 va_end(ap); 103 UseSharedSpaces = false; 104 assert(current_info() != NULL, "singleton must be registered"); 105 current_info()->close(); 106 } 107 108 // Fill in the fileMapInfo structure with data about this VM instance. 109 110 // This method copies the vm version info into header_version. If the version is too 111 // long then a truncated version, which has a hash code appended to it, is copied. 112 // 113 // Using a template enables this method to verify that header_version is an array of 114 // length JVM_IDENT_MAX. This ensures that the code that writes to the CDS file and 115 // the code that reads the CDS file will both use the same size buffer. Hence, will 116 // use identical truncation. This is necessary for matching of truncated versions. 117 template <int N> static void get_header_version(char (&header_version) [N]) { 118 assert(N == JVM_IDENT_MAX, "Bad header_version size"); 119 120 const char *vm_version = VM_Version::internal_vm_info_string(); 121 const int version_len = (int)strlen(vm_version); 122 123 if (version_len < (JVM_IDENT_MAX-1)) { 124 strcpy(header_version, vm_version); 125 126 } else { 127 // Get the hash value. Use a static seed because the hash needs to return the same 128 // value over multiple jvm invocations. 129 unsigned int hash = AltHashing::murmur3_32(8191, (const jbyte*)vm_version, version_len); 130 131 // Truncate the ident, saving room for the 8 hex character hash value. 132 strncpy(header_version, vm_version, JVM_IDENT_MAX-9); 133 134 // Append the hash code as eight hex digits. 135 sprintf(&header_version[JVM_IDENT_MAX-9], "%08x", hash); 136 header_version[JVM_IDENT_MAX-1] = 0; // Null terminate. 137 } 138 } 139 140 FileMapInfo::FileMapInfo() { 141 assert(_current_info == NULL, "must be singleton"); // not thread safe 142 _current_info = this; 143 memset(this, 0, sizeof(FileMapInfo)); 144 _file_offset = 0; 145 _file_open = false; 146 _header = SharedClassUtil::allocate_file_map_header(); 147 _header->_version = _invalid_version; 148 } 149 150 FileMapInfo::~FileMapInfo() { 151 assert(_current_info == this, "must be singleton"); // not thread safe 152 _current_info = NULL; 153 } 154 155 void FileMapInfo::populate_header(size_t alignment) { 156 _header->populate(this, alignment); 157 } 158 159 size_t FileMapInfo::FileMapHeader::data_size() { 160 return SharedClassUtil::file_map_header_size() - sizeof(FileMapInfo::FileMapHeaderBase); 161 } 162 163 void FileMapInfo::FileMapHeader::populate(FileMapInfo* mapinfo, size_t alignment) { 164 _magic = 0xf00baba2; 165 _version = _current_version; 166 _alignment = alignment; 167 _obj_alignment = ObjectAlignmentInBytes; 168 _classpath_entry_table_size = mapinfo->_classpath_entry_table_size; 169 _classpath_entry_table = mapinfo->_classpath_entry_table; 170 _classpath_entry_size = mapinfo->_classpath_entry_size; 171 172 // The following fields are for sanity checks for whether this archive 173 // will function correctly with this JVM and the bootclasspath it's 174 // invoked with. 175 176 // JVM version string ... changes on each build. 177 get_header_version(_jvm_ident); 178 } 179 180 void FileMapInfo::allocate_classpath_entry_table() { 181 int bytes = 0; 182 int count = 0; 183 char* strptr = NULL; 184 char* strptr_max = NULL; 185 Thread* THREAD = Thread::current(); 186 187 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 188 size_t entry_size = SharedClassUtil::shared_class_path_entry_size(); 189 190 for (int pass=0; pass<2; pass++) { 191 ClassPathEntry *cpe = ClassLoader::classpath_entry(0); 192 193 for (int cur_entry = 0 ; cpe != NULL; cpe = cpe->next(), cur_entry++) { 194 const char *name = cpe->name(); 195 int name_bytes = (int)(strlen(name) + 1); 196 197 if (pass == 0) { 198 count ++; 199 bytes += (int)entry_size; 200 bytes += name_bytes; 201 if (TraceClassPaths || (TraceClassLoading && Verbose)) { 202 tty->print_cr("[Add main shared path (%s) %s]", (cpe->is_jar_file() ? "jar" : "dir"), name); 203 } 204 } else { 205 SharedClassPathEntry* ent = shared_classpath(cur_entry); 206 if (cpe->is_jar_file()) { 207 struct stat st; 208 if (os::stat(name, &st) != 0) { 209 // The file/dir must exist, or it would not have been added 210 // into ClassLoader::classpath_entry(). 211 // 212 // If we can't access a jar file in the boot path, then we can't 213 // make assumptions about where classes get loaded from. 214 FileMapInfo::fail_stop("Unable to open jar file %s.", name); 215 } 216 217 EXCEPTION_MARK; // The following call should never throw, but would exit VM on error. 218 SharedClassUtil::update_shared_classpath(cpe, ent, st.st_mtime, st.st_size, THREAD); 219 } else { 220 ent->_filesize = -1; 221 if (!os::dir_is_empty(name)) { 222 ClassLoader::exit_with_path_failure("Cannot have non-empty directory in archived classpaths", name); 223 } 224 } 225 ent->_name = strptr; 226 if (strptr + name_bytes <= strptr_max) { 227 strncpy(strptr, name, (size_t)name_bytes); // name_bytes includes trailing 0. 228 strptr += name_bytes; 229 } else { 230 assert(0, "miscalculated buffer size"); 231 } 232 } 233 } 234 235 if (pass == 0) { 236 EXCEPTION_MARK; // The following call should never throw, but would exit VM on error. 237 Array<u8>* arr = MetadataFactory::new_array<u8>(loader_data, (bytes + 7)/8, THREAD); 238 strptr = (char*)(arr->data()); 239 strptr_max = strptr + bytes; 240 SharedClassPathEntry* table = (SharedClassPathEntry*)strptr; 241 strptr += entry_size * count; 242 243 _classpath_entry_table_size = count; 244 _classpath_entry_table = table; 245 _classpath_entry_size = entry_size; 246 } 247 } 248 } 249 250 bool FileMapInfo::validate_classpath_entry_table() { 251 _validating_classpath_entry_table = true; 252 253 int count = _header->_classpath_entry_table_size; 254 255 _classpath_entry_table = _header->_classpath_entry_table; 256 _classpath_entry_size = _header->_classpath_entry_size; 257 258 for (int i=0; i<count; i++) { 259 SharedClassPathEntry* ent = shared_classpath(i); 260 struct stat st; 261 const char* name = ent->_name; 262 bool ok = true; 263 if (TraceClassPaths || (TraceClassLoading && Verbose)) { 264 tty->print_cr("[Checking shared classpath entry: %s]", name); 265 } 266 if (os::stat(name, &st) != 0) { 267 fail_continue("Required classpath entry does not exist: %s", name); 268 ok = false; 269 } else if (ent->is_dir()) { 270 if (!os::dir_is_empty(name)) { 271 fail_continue("directory is not empty: %s", name); 272 ok = false; 273 } 274 } else { 275 if (ent->_timestamp != st.st_mtime || 276 ent->_filesize != st.st_size) { 277 ok = false; 278 if (PrintSharedArchiveAndExit) { 279 fail_continue(ent->_timestamp != st.st_mtime ? 280 "Timestamp mismatch" : 281 "File size mismatch"); 282 } else { 283 fail_continue("A jar file is not the one used while building" 284 " the shared archive file: %s", name); 285 } 286 } 287 } 288 if (ok) { 289 if (TraceClassPaths || (TraceClassLoading && Verbose)) { 290 tty->print_cr("[ok]"); 291 } 292 } else if (!PrintSharedArchiveAndExit) { 293 _validating_classpath_entry_table = false; 294 return false; 295 } 296 } 297 298 _classpath_entry_table_size = _header->_classpath_entry_table_size; 299 _validating_classpath_entry_table = false; 300 return true; 301 } 302 303 304 // Read the FileMapInfo information from the file. 305 306 bool FileMapInfo::init_from_file(int fd) { 307 size_t sz = _header->data_size(); 308 char* addr = _header->data(); 309 size_t n = os::read(fd, addr, (unsigned int)sz); 310 if (n != sz) { 311 fail_continue("Unable to read the file header."); 312 return false; 313 } 314 if (_header->_version != current_version()) { 315 fail_continue("The shared archive file has the wrong version."); 316 return false; 317 } 318 _file_offset = (long)n; 319 320 size_t info_size = _header->_paths_misc_info_size; 321 _paths_misc_info = NEW_C_HEAP_ARRAY_RETURN_NULL(char, info_size, mtClass); 322 if (_paths_misc_info == NULL) { 323 fail_continue("Unable to read the file header."); 324 return false; 325 } 326 n = os::read(fd, _paths_misc_info, (unsigned int)info_size); 327 if (n != info_size) { 328 fail_continue("Unable to read the shared path info header."); 329 FREE_C_HEAP_ARRAY(char, _paths_misc_info, mtClass); 330 _paths_misc_info = NULL; 331 return false; 332 } 333 334 _file_offset += (long)n; 335 return true; 336 } 337 338 339 // Read the FileMapInfo information from the file. 340 bool FileMapInfo::open_for_read() { 341 _full_path = Arguments::GetSharedArchivePath(); 342 int fd = open(_full_path, O_RDONLY | O_BINARY, 0); 343 if (fd < 0) { 344 if (errno == ENOENT) { 345 // Not locating the shared archive is ok. 346 fail_continue("Specified shared archive not found."); 347 } else { 348 fail_continue("Failed to open shared archive file (%s).", 349 strerror(errno)); 350 } 351 return false; 352 } 353 354 _fd = fd; 355 _file_open = true; 356 return true; 357 } 358 359 360 // Write the FileMapInfo information to the file. 361 362 void FileMapInfo::open_for_write() { 363 _full_path = Arguments::GetSharedArchivePath(); 364 if (PrintSharedSpaces) { 365 tty->print_cr("Dumping shared data to file: "); 366 tty->print_cr(" %s", _full_path); 367 } 368 369 #ifdef _WINDOWS // On Windows, need WRITE permission to remove the file. 370 chmod(_full_path, _S_IREAD | _S_IWRITE); 371 #endif 372 373 // Use remove() to delete the existing file because, on Unix, this will 374 // allow processes that have it open continued access to the file. 375 remove(_full_path); 376 int fd = open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0444); 377 if (fd < 0) { 378 fail_stop("Unable to create shared archive file %s.", _full_path); 379 } 380 _fd = fd; 381 _file_offset = 0; 382 _file_open = true; 383 } 384 385 386 // Write the header to the file, seek to the next allocation boundary. 387 388 void FileMapInfo::write_header() { 389 int info_size = ClassLoader::get_shared_paths_misc_info_size(); 390 391 _header->_paths_misc_info_size = info_size; 392 393 align_file_position(); 394 size_t sz = _header->data_size(); 395 char* addr = _header->data(); 396 write_bytes(addr, (int)sz); // skip the C++ vtable 397 write_bytes(ClassLoader::get_shared_paths_misc_info(), info_size); 398 align_file_position(); 399 } 400 401 402 // Dump shared spaces to file. 403 404 void FileMapInfo::write_space(int i, Metaspace* space, bool read_only) { 405 align_file_position(); 406 size_t used = space->used_bytes_slow(Metaspace::NonClassType); 407 size_t capacity = space->capacity_bytes_slow(Metaspace::NonClassType); 408 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i]; 409 write_region(i, (char*)space->bottom(), used, capacity, read_only, false); 410 } 411 412 413 // Dump region to file. 414 415 void FileMapInfo::write_region(int region, char* base, size_t size, 416 size_t capacity, bool read_only, 417 bool allow_exec) { 418 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[region]; 419 420 if (_file_open) { 421 guarantee(si->_file_offset == _file_offset, "file offset mismatch."); 422 if (PrintSharedSpaces) { 423 tty->print_cr("Shared file region %d: 0x%6x bytes, addr " INTPTR_FORMAT 424 " file offset 0x%6x", region, size, base, _file_offset); 425 } 426 } else { 427 si->_file_offset = _file_offset; 428 } 429 si->_base = base; 430 si->_used = size; 431 si->_capacity = capacity; 432 si->_read_only = read_only; 433 si->_allow_exec = allow_exec; 434 write_bytes_aligned(base, (int)size); 435 } 436 437 438 // Dump bytes to file -- at the current file position. 439 440 void FileMapInfo::write_bytes(const void* buffer, int nbytes) { 441 if (_file_open) { 442 int n = ::write(_fd, buffer, nbytes); 443 if (n != nbytes) { 444 // It is dangerous to leave the corrupted shared archive file around, 445 // close and remove the file. See bug 6372906. 446 close(); 447 remove(_full_path); 448 fail_stop("Unable to write to shared archive file."); 449 } 450 } 451 _file_offset += nbytes; 452 } 453 454 455 // Align file position to an allocation unit boundary. 456 457 void FileMapInfo::align_file_position() { 458 long new_file_offset = align_size_up(_file_offset, os::vm_allocation_granularity()); 459 if (new_file_offset != _file_offset) { 460 _file_offset = new_file_offset; 461 if (_file_open) { 462 // Seek one byte back from the target and write a byte to insure 463 // that the written file is the correct length. 464 _file_offset -= 1; 465 if (lseek(_fd, _file_offset, SEEK_SET) < 0) { 466 fail_stop("Unable to seek."); 467 } 468 char zero = 0; 469 write_bytes(&zero, 1); 470 } 471 } 472 } 473 474 475 // Dump bytes to file -- at the current file position. 476 477 void FileMapInfo::write_bytes_aligned(const void* buffer, int nbytes) { 478 align_file_position(); 479 write_bytes(buffer, nbytes); 480 align_file_position(); 481 } 482 483 484 // Close the shared archive file. This does NOT unmap mapped regions. 485 486 void FileMapInfo::close() { 487 if (_file_open) { 488 if (::close(_fd) < 0) { 489 fail_stop("Unable to close the shared archive file."); 490 } 491 _file_open = false; 492 _fd = -1; 493 } 494 } 495 496 497 // JVM/TI RedefineClasses() support: 498 // Remap the shared readonly space to shared readwrite, private. 499 bool FileMapInfo::remap_shared_readonly_as_readwrite() { 500 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[0]; 501 if (!si->_read_only) { 502 // the space is already readwrite so we are done 503 return true; 504 } 505 size_t used = si->_used; 506 size_t size = align_size_up(used, os::vm_allocation_granularity()); 507 if (!open_for_read()) { 508 return false; 509 } 510 char *base = os::remap_memory(_fd, _full_path, si->_file_offset, 511 si->_base, size, false /* !read_only */, 512 si->_allow_exec); 513 close(); 514 if (base == NULL) { 515 fail_continue("Unable to remap shared readonly space (errno=%d).", errno); 516 return false; 517 } 518 if (base != si->_base) { 519 fail_continue("Unable to remap shared readonly space at required address."); 520 return false; 521 } 522 si->_read_only = false; 523 return true; 524 } 525 526 // Map the whole region at once, assumed to be allocated contiguously. 527 ReservedSpace FileMapInfo::reserve_shared_memory() { 528 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[0]; 529 char* requested_addr = si->_base; 530 531 size_t size = FileMapInfo::shared_spaces_size(); 532 533 // Reserve the space first, then map otherwise map will go right over some 534 // other reserved memory (like the code cache). 535 ReservedSpace rs(size, os::vm_allocation_granularity(), false, requested_addr); 536 if (!rs.is_reserved()) { 537 fail_continue("Unable to reserve shared space at required address " INTPTR_FORMAT, requested_addr); 538 return rs; 539 } 540 // the reserved virtual memory is for mapping class data sharing archive 541 MemTracker::record_virtual_memory_type((address)rs.base(), mtClassShared); 542 543 return rs; 544 } 545 546 // Memory map a region in the address space. 547 static const char* shared_region_name[] = { "ReadOnly", "ReadWrite", "MiscData", "MiscCode"}; 548 549 char* FileMapInfo::map_region(int i) { 550 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i]; 551 size_t used = si->_used; 552 size_t alignment = os::vm_allocation_granularity(); 553 size_t size = align_size_up(used, alignment); 554 char *requested_addr = si->_base; 555 556 // map the contents of the CDS archive in this memory 557 char *base = os::map_memory(_fd, _full_path, si->_file_offset, 558 requested_addr, size, si->_read_only, 559 si->_allow_exec); 560 if (base == NULL || base != si->_base) { 561 fail_continue("Unable to map %s shared space at required address.", shared_region_name[i]); 562 return NULL; 563 } 564 #ifdef _WINDOWS 565 // This call is Windows-only because the memory_type gets recorded for the other platforms 566 // in method FileMapInfo::reserve_shared_memory(), which is not called on Windows. 567 MemTracker::record_virtual_memory_type((address)base, mtClassShared); 568 #endif 569 return base; 570 } 571 572 573 // Unmap a memory region in the address space. 574 575 void FileMapInfo::unmap_region(int i) { 576 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i]; 577 size_t used = si->_used; 578 size_t size = align_size_up(used, os::vm_allocation_granularity()); 579 if (!os::unmap_memory(si->_base, size)) { 580 fail_stop("Unable to unmap shared space."); 581 } 582 } 583 584 585 void FileMapInfo::assert_mark(bool check) { 586 if (!check) { 587 fail_stop("Mark mismatch while restoring from shared file."); 588 } 589 } 590 591 592 FileMapInfo* FileMapInfo::_current_info = NULL; 593 SharedClassPathEntry* FileMapInfo::_classpath_entry_table = NULL; 594 int FileMapInfo::_classpath_entry_table_size = 0; 595 size_t FileMapInfo::_classpath_entry_size = 0x1234baad; 596 bool FileMapInfo::_validating_classpath_entry_table = false; 597 598 // Open the shared archive file, read and validate the header 599 // information (version, boot classpath, etc.). If initialization 600 // fails, shared spaces are disabled and the file is closed. [See 601 // fail_continue.] 602 // 603 // Validation of the archive is done in two steps: 604 // 605 // [1] validate_header() - done here. This checks the header, including _paths_misc_info. 606 // [2] validate_classpath_entry_table - this is done later, because the table is in the RW 607 // region of the archive, which is not mapped yet. 608 bool FileMapInfo::initialize() { 609 assert(UseSharedSpaces, "UseSharedSpaces expected."); 610 611 if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space()) { 612 fail_continue("Tool agent requires sharing to be disabled."); 613 return false; 614 } 615 616 if (!open_for_read()) { 617 return false; 618 } 619 620 init_from_file(_fd); 621 if (!validate_header()) { 622 return false; 623 } 624 625 SharedReadOnlySize = _header->_space[0]._capacity; 626 SharedReadWriteSize = _header->_space[1]._capacity; 627 SharedMiscDataSize = _header->_space[2]._capacity; 628 SharedMiscCodeSize = _header->_space[3]._capacity; 629 return true; 630 } 631 632 bool FileMapInfo::FileMapHeader::validate() { 633 if (_version != current_version()) { 634 FileMapInfo::fail_continue("The shared archive file is the wrong version."); 635 return false; 636 } 637 if (_magic != (int)0xf00baba2) { 638 FileMapInfo::fail_continue("The shared archive file has a bad magic number."); 639 return false; 640 } 641 char header_version[JVM_IDENT_MAX]; 642 get_header_version(header_version); 643 if (strncmp(_jvm_ident, header_version, JVM_IDENT_MAX-1) != 0) { 644 if (TraceClassPaths) { 645 tty->print_cr("Expected: %s", header_version); 646 tty->print_cr("Actual: %s", _jvm_ident); 647 } 648 FileMapInfo::fail_continue("The shared archive file was created by a different" 649 " version or build of HotSpot"); 650 return false; 651 } 652 if (_obj_alignment != ObjectAlignmentInBytes) { 653 FileMapInfo::fail_continue("The shared archive file's ObjectAlignmentInBytes of %d" 654 " does not equal the current ObjectAlignmentInBytes of %d.", 655 _obj_alignment, ObjectAlignmentInBytes); 656 return false; 657 } 658 659 return true; 660 } 661 662 bool FileMapInfo::validate_header() { 663 bool status = _header->validate(); 664 665 if (status) { 666 if (!ClassLoader::check_shared_paths_misc_info(_paths_misc_info, _header->_paths_misc_info_size)) { 667 if (!PrintSharedArchiveAndExit) { 668 fail_continue("shared class paths mismatch (hint: enable -XX:+TraceClassPaths to diagnose the failure)"); 669 status = false; 670 } 671 } 672 } 673 674 if (_paths_misc_info != NULL) { 675 FREE_C_HEAP_ARRAY(char, _paths_misc_info, mtClass); 676 _paths_misc_info = NULL; 677 } 678 return status; 679 } 680 681 // The following method is provided to see whether a given pointer 682 // falls in the mapped shared space. 683 // Param: 684 // p, The given pointer 685 // Return: 686 // True if the p is within the mapped shared space, otherwise, false. 687 bool FileMapInfo::is_in_shared_space(const void* p) { 688 for (int i = 0; i < MetaspaceShared::n_regions; i++) { 689 if (p >= _header->_space[i]._base && 690 p < _header->_space[i]._base + _header->_space[i]._used) { 691 return true; 692 } 693 } 694 695 return false; 696 } 697 698 void FileMapInfo::print_shared_spaces() { 699 gclog_or_tty->print_cr("Shared Spaces:"); 700 for (int i = 0; i < MetaspaceShared::n_regions; i++) { 701 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i]; 702 gclog_or_tty->print(" %s " INTPTR_FORMAT "-" INTPTR_FORMAT, 703 shared_region_name[i], 704 si->_base, si->_base + si->_used); 705 } 706 } 707 708 // Unmap mapped regions of shared space. 709 void FileMapInfo::stop_sharing_and_unmap(const char* msg) { 710 FileMapInfo *map_info = FileMapInfo::current_info(); 711 if (map_info) { 712 map_info->fail_continue("%s", msg); 713 for (int i = 0; i < MetaspaceShared::n_regions; i++) { 714 if (map_info->_header->_space[i]._base != NULL) { 715 map_info->unmap_region(i); 716 map_info->_header->_space[i]._base = NULL; 717 } 718 } 719 } else if (DumpSharedSpaces) { 720 fail_stop("%s", msg); 721 } 722 }