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);
330 _paths_misc_info = NULL;
331 return false;
332 }
333
334 size_t len = lseek(fd, 0, SEEK_END);
335 struct FileMapInfo::FileMapHeader::space_info* si =
336 &_header->_space[MetaspaceShared::mc];
337 if (si->_file_offset >= len || len - si->_file_offset < si->_used) {
338 fail_continue("The shared archive file has been truncated.");
339 return false;
340 }
341
342 _file_offset += (long)n;
343 return true;
344 }
345
346
347 // Read the FileMapInfo information from the file.
348 bool FileMapInfo::open_for_read() {
349 _full_path = Arguments::GetSharedArchivePath();
350 int fd = open(_full_path, O_RDONLY | O_BINARY, 0);
351 if (fd < 0) {
352 if (errno == ENOENT) {
353 // Not locating the shared archive is ok.
354 fail_continue("Specified shared archive not found.");
355 } else {
356 fail_continue("Failed to open shared archive file (%s).",
357 strerror(errno));
358 }
359 return false;
360 }
361
362 _fd = fd;
363 _file_open = true;
364 return true;
365 }
366
367
368 // Write the FileMapInfo information to the file.
369
370 void FileMapInfo::open_for_write() {
371 _full_path = Arguments::GetSharedArchivePath();
372 if (PrintSharedSpaces) {
373 tty->print_cr("Dumping shared data to file: ");
374 tty->print_cr(" %s", _full_path);
375 }
376
377 #ifdef _WINDOWS // On Windows, need WRITE permission to remove the file.
378 chmod(_full_path, _S_IREAD | _S_IWRITE);
379 #endif
380
381 // Use remove() to delete the existing file because, on Unix, this will
382 // allow processes that have it open continued access to the file.
383 remove(_full_path);
384 int fd = open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0444);
385 if (fd < 0) {
386 fail_stop("Unable to create shared archive file %s.", _full_path);
387 }
388 _fd = fd;
389 _file_offset = 0;
390 _file_open = true;
391 }
392
393
394 // Write the header to the file, seek to the next allocation boundary.
395
396 void FileMapInfo::write_header() {
397 int info_size = ClassLoader::get_shared_paths_misc_info_size();
398
399 _header->_paths_misc_info_size = info_size;
400
401 align_file_position();
402 size_t sz = _header->data_size();
403 char* addr = _header->data();
404 write_bytes(addr, (int)sz); // skip the C++ vtable
405 write_bytes(ClassLoader::get_shared_paths_misc_info(), info_size);
406 align_file_position();
407 }
408
409
410 // Dump shared spaces to file.
411
412 void FileMapInfo::write_space(int i, Metaspace* space, bool read_only) {
413 align_file_position();
414 size_t used = space->used_bytes_slow(Metaspace::NonClassType);
415 size_t capacity = space->capacity_bytes_slow(Metaspace::NonClassType);
416 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i];
417 write_region(i, (char*)space->bottom(), used, capacity, read_only, false);
418 }
419
420
421 // Dump region to file.
422
423 void FileMapInfo::write_region(int region, char* base, size_t size,
424 size_t capacity, bool read_only,
425 bool allow_exec) {
426 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[region];
427
428 if (_file_open) {
429 guarantee(si->_file_offset == _file_offset, "file offset mismatch.");
430 if (PrintSharedSpaces) {
431 tty->print_cr("Shared file region %d: 0x%6x bytes, addr " INTPTR_FORMAT
432 " file offset 0x%6x", region, size, base, _file_offset);
433 }
434 } else {
435 si->_file_offset = _file_offset;
436 }
437 si->_base = base;
438 si->_used = size;
439 si->_capacity = capacity;
440 si->_read_only = read_only;
441 si->_allow_exec = allow_exec;
442 si->_crc = ClassLoader::crc32(0, base, (jint)size);
443 write_bytes_aligned(base, (int)size);
444 }
445
446
447 // Dump bytes to file -- at the current file position.
448
449 void FileMapInfo::write_bytes(const void* buffer, int nbytes) {
450 if (_file_open) {
451 int n = ::write(_fd, buffer, nbytes);
452 if (n != nbytes) {
453 // It is dangerous to leave the corrupted shared archive file around,
454 // close and remove the file. See bug 6372906.
455 close();
456 remove(_full_path);
457 fail_stop("Unable to write to shared archive file.");
458 }
459 }
460 _file_offset += nbytes;
461 }
462
463
464 // Align file position to an allocation unit boundary.
465
466 void FileMapInfo::align_file_position() {
467 size_t new_file_offset = align_size_up(_file_offset,
468 os::vm_allocation_granularity());
469 if (new_file_offset != _file_offset) {
470 _file_offset = new_file_offset;
471 if (_file_open) {
472 // Seek one byte back from the target and write a byte to insure
473 // that the written file is the correct length.
474 _file_offset -= 1;
475 if (lseek(_fd, (long)_file_offset, SEEK_SET) < 0) {
476 fail_stop("Unable to seek.");
477 }
478 char zero = 0;
479 write_bytes(&zero, 1);
480 }
481 }
482 }
483
484
485 // Dump bytes to file -- at the current file position.
486
487 void FileMapInfo::write_bytes_aligned(const void* buffer, int nbytes) {
488 align_file_position();
489 write_bytes(buffer, nbytes);
490 align_file_position();
491 }
492
493
494 // Close the shared archive file. This does NOT unmap mapped regions.
495
496 void FileMapInfo::close() {
497 if (_file_open) {
498 if (::close(_fd) < 0) {
499 fail_stop("Unable to close the shared archive file.");
500 }
501 _file_open = false;
502 _fd = -1;
503 }
504 }
505
506
507 // JVM/TI RedefineClasses() support:
508 // Remap the shared readonly space to shared readwrite, private.
509 bool FileMapInfo::remap_shared_readonly_as_readwrite() {
510 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[0];
511 if (!si->_read_only) {
512 // the space is already readwrite so we are done
513 return true;
514 }
515 size_t used = si->_used;
516 size_t size = align_size_up(used, os::vm_allocation_granularity());
517 if (!open_for_read()) {
518 return false;
519 }
520 char *base = os::remap_memory(_fd, _full_path, si->_file_offset,
521 si->_base, size, false /* !read_only */,
522 si->_allow_exec);
523 close();
524 if (base == NULL) {
525 fail_continue("Unable to remap shared readonly space (errno=%d).", errno);
526 return false;
527 }
528 if (base != si->_base) {
529 fail_continue("Unable to remap shared readonly space at required address.");
530 return false;
531 }
532 si->_read_only = false;
533 return true;
534 }
535
536 // Map the whole region at once, assumed to be allocated contiguously.
537 ReservedSpace FileMapInfo::reserve_shared_memory() {
538 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[0];
539 char* requested_addr = si->_base;
540
541 size_t size = FileMapInfo::shared_spaces_size();
542
543 // Reserve the space first, then map otherwise map will go right over some
544 // other reserved memory (like the code cache).
545 ReservedSpace rs(size, os::vm_allocation_granularity(), false, requested_addr);
546 if (!rs.is_reserved()) {
547 fail_continue("Unable to reserve shared space at required address " INTPTR_FORMAT, requested_addr);
548 return rs;
549 }
550 // the reserved virtual memory is for mapping class data sharing archive
551 MemTracker::record_virtual_memory_type((address)rs.base(), mtClassShared);
552
553 return rs;
554 }
555
556 // Memory map a region in the address space.
557 static const char* shared_region_name[] = { "ReadOnly", "ReadWrite", "MiscData", "MiscCode"};
558
559 char* FileMapInfo::map_region(int i) {
560 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i];
561 size_t used = si->_used;
562 size_t alignment = os::vm_allocation_granularity();
563 size_t size = align_size_up(used, alignment);
564 char *requested_addr = si->_base;
565
566 // map the contents of the CDS archive in this memory
567 char *base = os::map_memory(_fd, _full_path, si->_file_offset,
568 requested_addr, size, si->_read_only,
569 si->_allow_exec);
570 if (base == NULL || base != si->_base) {
571 fail_continue("Unable to map %s shared space at required address.", shared_region_name[i]);
572 return NULL;
573 }
574 #ifdef _WINDOWS
575 // This call is Windows-only because the memory_type gets recorded for the other platforms
576 // in method FileMapInfo::reserve_shared_memory(), which is not called on Windows.
577 MemTracker::record_virtual_memory_type((address)base, mtClassShared);
578 #endif
579 return base;
580 }
581
582 bool FileMapInfo::verify_region_checksum(int i) {
583 if (!VerifySharedSpaces) {
584 return true;
585 }
586 const char* buf = _header->_space[i]._base;
587 size_t sz = _header->_space[i]._used;
588 int crc = ClassLoader::crc32(0, buf, (jint)sz);
589 if (crc != _header->_space[i]._crc) {
590 fail_continue("Checksum verification failed.");
591 return false;
592 }
593 return true;
594 }
595
596 // Unmap a memory region in the address space.
597
598 void FileMapInfo::unmap_region(int i) {
599 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i];
600 size_t used = si->_used;
601 size_t size = align_size_up(used, os::vm_allocation_granularity());
602 if (!os::unmap_memory(si->_base, size)) {
603 fail_stop("Unable to unmap shared space.");
604 }
605 }
606
607
608 void FileMapInfo::assert_mark(bool check) {
609 if (!check) {
610 fail_stop("Mark mismatch while restoring from shared file.");
611 }
612 }
613
614
615 FileMapInfo* FileMapInfo::_current_info = NULL;
616 SharedClassPathEntry* FileMapInfo::_classpath_entry_table = NULL;
617 int FileMapInfo::_classpath_entry_table_size = 0;
618 size_t FileMapInfo::_classpath_entry_size = 0x1234baad;
619 bool FileMapInfo::_validating_classpath_entry_table = false;
620
621 // Open the shared archive file, read and validate the header
622 // information (version, boot classpath, etc.). If initialization
623 // fails, shared spaces are disabled and the file is closed. [See
624 // fail_continue.]
625 //
626 // Validation of the archive is done in two steps:
627 //
628 // [1] validate_header() - done here. This checks the header, including _paths_misc_info.
629 // [2] validate_classpath_entry_table - this is done later, because the table is in the RW
630 // region of the archive, which is not mapped yet.
631 bool FileMapInfo::initialize() {
632 assert(UseSharedSpaces, "UseSharedSpaces expected.");
633
634 if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space()) {
635 fail_continue("Tool agent requires sharing to be disabled.");
636 return false;
637 }
638
639 if (!open_for_read()) {
640 return false;
641 }
642
643 init_from_file(_fd);
644 if (!validate_header()) {
645 return false;
646 }
647
648 SharedReadOnlySize = _header->_space[0]._capacity;
649 SharedReadWriteSize = _header->_space[1]._capacity;
650 SharedMiscDataSize = _header->_space[2]._capacity;
651 SharedMiscCodeSize = _header->_space[3]._capacity;
652 return true;
653 }
654
655 int FileMapInfo::FileMapHeader::compute_crc() {
656 char* header = data();
657 // start computing from the field after _crc
658 char* buf = (char*)&_crc + sizeof(int);
659 size_t sz = data_size() - (buf - header);
660 int crc = ClassLoader::crc32(0, buf, (jint)sz);
661 return crc;
662 }
663
664 bool FileMapInfo::FileMapHeader::validate() {
665 if (VerifySharedSpaces && compute_crc() != _crc) {
666 fail_continue("Header checksum verification failed.");
667 return false;
668 }
669
670 if (_version != current_version()) {
671 FileMapInfo::fail_continue("The shared archive file is the wrong version.");
672 return false;
673 }
674 if (_magic != (int)0xf00baba2) {
675 FileMapInfo::fail_continue("The shared archive file has a bad magic number.");
676 return false;
677 }
678 char header_version[JVM_IDENT_MAX];
679 get_header_version(header_version);
680 if (strncmp(_jvm_ident, header_version, JVM_IDENT_MAX-1) != 0) {
681 if (TraceClassPaths) {
682 tty->print_cr("Expected: %s", header_version);
683 tty->print_cr("Actual: %s", _jvm_ident);
684 }
685 FileMapInfo::fail_continue("The shared archive file was created by a different"
686 " version or build of HotSpot");
687 return false;
688 }
689 if (_obj_alignment != ObjectAlignmentInBytes) {
690 FileMapInfo::fail_continue("The shared archive file's ObjectAlignmentInBytes of %d"
691 " does not equal the current ObjectAlignmentInBytes of %d.",
692 _obj_alignment, ObjectAlignmentInBytes);
693 return false;
694 }
695
696 return true;
697 }
698
699 bool FileMapInfo::validate_header() {
700 bool status = _header->validate();
701
702 if (status) {
703 if (!ClassLoader::check_shared_paths_misc_info(_paths_misc_info, _header->_paths_misc_info_size)) {
704 if (!PrintSharedArchiveAndExit) {
705 fail_continue("shared class paths mismatch (hint: enable -XX:+TraceClassPaths to diagnose the failure)");
706 status = false;
707 }
708 }
709 }
710
711 if (_paths_misc_info != NULL) {
712 FREE_C_HEAP_ARRAY(char, _paths_misc_info);
713 _paths_misc_info = NULL;
714 }
715 return status;
716 }
717
718 // The following method is provided to see whether a given pointer
719 // falls in the mapped shared space.
720 // Param:
721 // p, The given pointer
722 // Return:
723 // True if the p is within the mapped shared space, otherwise, false.
724 bool FileMapInfo::is_in_shared_space(const void* p) {
725 for (int i = 0; i < MetaspaceShared::n_regions; i++) {
726 if (p >= _header->_space[i]._base &&
727 p < _header->_space[i]._base + _header->_space[i]._used) {
728 return true;
729 }
730 }
731
732 return false;
733 }
734
735 void FileMapInfo::print_shared_spaces() {
736 gclog_or_tty->print_cr("Shared Spaces:");
737 for (int i = 0; i < MetaspaceShared::n_regions; i++) {
738 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i];
739 gclog_or_tty->print(" %s " INTPTR_FORMAT "-" INTPTR_FORMAT,
740 shared_region_name[i],
741 si->_base, si->_base + si->_used);
742 }
743 }
744
745 // Unmap mapped regions of shared space.
746 void FileMapInfo::stop_sharing_and_unmap(const char* msg) {
747 FileMapInfo *map_info = FileMapInfo::current_info();
748 if (map_info) {
749 map_info->fail_continue("%s", msg);
750 for (int i = 0; i < MetaspaceShared::n_regions; i++) {
751 if (map_info->_header->_space[i]._base != NULL) {
752 map_info->unmap_region(i);
753 map_info->_header->_space[i]._base = NULL;
754 }
755 }
756 } else if (DumpSharedSpaces) {
757 fail_stop("%s", msg);
758 }
759 }