Thu, 12 Oct 2017 21:27:07 +0800
merge
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 */
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 "services/memTracker.hpp"
39 #include "utilities/defaultStream.hpp"
41 # include <sys/stat.h>
42 # include <errno.h>
44 #ifndef O_BINARY // if defined (Win32) use binary files.
45 #define O_BINARY 0 // otherwise do nothing.
46 #endif
48 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
49 extern address JVM_FunctionAtStart();
50 extern address JVM_FunctionAtEnd();
52 // Complain and stop. All error conditions occurring during the writing of
53 // an archive file should stop the process. Unrecoverable errors during
54 // the reading of the archive file should stop the process.
56 static void fail(const char *msg, va_list ap) {
57 // This occurs very early during initialization: tty is not initialized.
58 jio_fprintf(defaultStream::error_stream(),
59 "An error has occurred while processing the"
60 " shared archive file.\n");
61 jio_vfprintf(defaultStream::error_stream(), msg, ap);
62 jio_fprintf(defaultStream::error_stream(), "\n");
63 // Do not change the text of the below message because some tests check for it.
64 vm_exit_during_initialization("Unable to use shared archive.", NULL);
65 }
68 void FileMapInfo::fail_stop(const char *msg, ...) {
69 va_list ap;
70 va_start(ap, msg);
71 fail(msg, ap); // Never returns.
72 va_end(ap); // for completeness.
73 }
76 // Complain and continue. Recoverable errors during the reading of the
77 // archive file may continue (with sharing disabled).
78 //
79 // If we continue, then disable shared spaces and close the file.
81 void FileMapInfo::fail_continue(const char *msg, ...) {
82 va_list ap;
83 va_start(ap, msg);
84 MetaspaceShared::set_archive_loading_failed();
85 if (PrintSharedArchiveAndExit && _validating_classpath_entry_table) {
86 // If we are doing PrintSharedArchiveAndExit and some of the classpath entries
87 // do not validate, we can still continue "limping" to validate the remaining
88 // entries. No need to quit.
89 tty->print("[");
90 tty->vprint(msg, ap);
91 tty->print_cr("]");
92 } else {
93 if (RequireSharedSpaces) {
94 fail(msg, ap);
95 } else {
96 if (PrintSharedSpaces) {
97 tty->print_cr("UseSharedSpaces: %s", msg);
98 }
99 }
100 UseSharedSpaces = false;
101 assert(current_info() != NULL, "singleton must be registered");
102 current_info()->close();
103 }
104 va_end(ap);
105 }
107 // Fill in the fileMapInfo structure with data about this VM instance.
109 // This method copies the vm version info into header_version. If the version is too
110 // long then a truncated version, which has a hash code appended to it, is copied.
111 //
112 // Using a template enables this method to verify that header_version is an array of
113 // length JVM_IDENT_MAX. This ensures that the code that writes to the CDS file and
114 // the code that reads the CDS file will both use the same size buffer. Hence, will
115 // use identical truncation. This is necessary for matching of truncated versions.
116 template <int N> static void get_header_version(char (&header_version) [N]) {
117 assert(N == JVM_IDENT_MAX, "Bad header_version size");
119 const char *vm_version = VM_Version::internal_vm_info_string();
120 const int version_len = (int)strlen(vm_version);
122 if (version_len < (JVM_IDENT_MAX-1)) {
123 strcpy(header_version, vm_version);
125 } else {
126 // Get the hash value. Use a static seed because the hash needs to return the same
127 // value over multiple jvm invocations.
128 unsigned int hash = AltHashing::murmur3_32(8191, (const jbyte*)vm_version, version_len);
130 // Truncate the ident, saving room for the 8 hex character hash value.
131 strncpy(header_version, vm_version, JVM_IDENT_MAX-9);
133 // Append the hash code as eight hex digits.
134 sprintf(&header_version[JVM_IDENT_MAX-9], "%08x", hash);
135 header_version[JVM_IDENT_MAX-1] = 0; // Null terminate.
136 }
137 }
139 FileMapInfo::FileMapInfo() {
140 assert(_current_info == NULL, "must be singleton"); // not thread safe
141 _current_info = this;
142 memset(this, 0, sizeof(FileMapInfo));
143 _file_offset = 0;
144 _file_open = false;
145 _header = SharedClassUtil::allocate_file_map_header();
146 _header->_version = _invalid_version;
147 }
149 FileMapInfo::~FileMapInfo() {
150 assert(_current_info == this, "must be singleton"); // not thread safe
151 _current_info = NULL;
152 }
154 void FileMapInfo::populate_header(size_t alignment) {
155 _header->populate(this, alignment);
156 }
158 size_t FileMapInfo::FileMapHeader::data_size() {
159 return SharedClassUtil::file_map_header_size() - sizeof(FileMapInfo::FileMapHeaderBase);
160 }
162 void FileMapInfo::FileMapHeader::populate(FileMapInfo* mapinfo, size_t alignment) {
163 _magic = 0xf00baba2;
164 _version = _current_version;
165 _alignment = alignment;
166 _obj_alignment = ObjectAlignmentInBytes;
167 _classpath_entry_table_size = mapinfo->_classpath_entry_table_size;
168 _classpath_entry_table = mapinfo->_classpath_entry_table;
169 _classpath_entry_size = mapinfo->_classpath_entry_size;
171 // The following fields are for sanity checks for whether this archive
172 // will function correctly with this JVM and the bootclasspath it's
173 // invoked with.
175 // JVM version string ... changes on each build.
176 get_header_version(_jvm_ident);
177 }
179 void FileMapInfo::allocate_classpath_entry_table() {
180 int bytes = 0;
181 int count = 0;
182 char* strptr = NULL;
183 char* strptr_max = NULL;
184 Thread* THREAD = Thread::current();
186 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
187 size_t entry_size = SharedClassUtil::shared_class_path_entry_size();
189 for (int pass=0; pass<2; pass++) {
190 ClassPathEntry *cpe = ClassLoader::classpath_entry(0);
192 for (int cur_entry = 0 ; cpe != NULL; cpe = cpe->next(), cur_entry++) {
193 const char *name = cpe->name();
194 int name_bytes = (int)(strlen(name) + 1);
196 if (pass == 0) {
197 count ++;
198 bytes += (int)entry_size;
199 bytes += name_bytes;
200 if (TraceClassPaths || (TraceClassLoading && Verbose)) {
201 tty->print_cr("[Add main shared path (%s) %s]", (cpe->is_jar_file() ? "jar" : "dir"), name);
202 }
203 } else {
204 SharedClassPathEntry* ent = shared_classpath(cur_entry);
205 if (cpe->is_jar_file()) {
206 struct stat st;
207 if (os::stat(name, &st) != 0) {
208 // The file/dir must exist, or it would not have been added
209 // into ClassLoader::classpath_entry().
210 //
211 // If we can't access a jar file in the boot path, then we can't
212 // make assumptions about where classes get loaded from.
213 FileMapInfo::fail_stop("Unable to open jar file %s.", name);
214 }
216 EXCEPTION_MARK; // The following call should never throw, but would exit VM on error.
217 SharedClassUtil::update_shared_classpath(cpe, ent, st.st_mtime, st.st_size, THREAD);
218 } else {
219 ent->_filesize = -1;
220 if (!os::dir_is_empty(name)) {
221 ClassLoader::exit_with_path_failure("Cannot have non-empty directory in archived classpaths", name);
222 }
223 }
224 ent->_name = strptr;
225 if (strptr + name_bytes <= strptr_max) {
226 strncpy(strptr, name, (size_t)name_bytes); // name_bytes includes trailing 0.
227 strptr += name_bytes;
228 } else {
229 assert(0, "miscalculated buffer size");
230 }
231 }
232 }
234 if (pass == 0) {
235 EXCEPTION_MARK; // The following call should never throw, but would exit VM on error.
236 Array<u8>* arr = MetadataFactory::new_array<u8>(loader_data, (bytes + 7)/8, THREAD);
237 strptr = (char*)(arr->data());
238 strptr_max = strptr + bytes;
239 SharedClassPathEntry* table = (SharedClassPathEntry*)strptr;
240 strptr += entry_size * count;
242 _classpath_entry_table_size = count;
243 _classpath_entry_table = table;
244 _classpath_entry_size = entry_size;
245 }
246 }
247 }
249 bool FileMapInfo::validate_classpath_entry_table() {
250 _validating_classpath_entry_table = true;
252 int count = _header->_classpath_entry_table_size;
254 _classpath_entry_table = _header->_classpath_entry_table;
255 _classpath_entry_size = _header->_classpath_entry_size;
257 for (int i=0; i<count; i++) {
258 SharedClassPathEntry* ent = shared_classpath(i);
259 struct stat st;
260 const char* name = ent->_name;
261 bool ok = true;
262 if (TraceClassPaths || (TraceClassLoading && Verbose)) {
263 tty->print_cr("[Checking shared classpath entry: %s]", name);
264 }
265 if (os::stat(name, &st) != 0) {
266 fail_continue("Required classpath entry does not exist: %s", name);
267 ok = false;
268 } else if (ent->is_dir()) {
269 if (!os::dir_is_empty(name)) {
270 fail_continue("directory is not empty: %s", name);
271 ok = false;
272 }
273 } else {
274 if (ent->_timestamp != st.st_mtime ||
275 ent->_filesize != st.st_size) {
276 ok = false;
277 if (PrintSharedArchiveAndExit) {
278 fail_continue(ent->_timestamp != st.st_mtime ?
279 "Timestamp mismatch" :
280 "File size mismatch");
281 } else {
282 fail_continue("A jar file is not the one used while building"
283 " the shared archive file: %s", name);
284 }
285 }
286 }
287 if (ok) {
288 if (TraceClassPaths || (TraceClassLoading && Verbose)) {
289 tty->print_cr("[ok]");
290 }
291 } else if (!PrintSharedArchiveAndExit) {
292 _validating_classpath_entry_table = false;
293 return false;
294 }
295 }
297 _classpath_entry_table_size = _header->_classpath_entry_table_size;
298 _validating_classpath_entry_table = false;
299 return true;
300 }
303 // Read the FileMapInfo information from the file.
305 bool FileMapInfo::init_from_file(int fd) {
306 size_t sz = _header->data_size();
307 char* addr = _header->data();
308 size_t n = os::read(fd, addr, (unsigned int)sz);
309 if (n != sz) {
310 fail_continue("Unable to read the file header.");
311 return false;
312 }
313 if (_header->_version != current_version()) {
314 fail_continue("The shared archive file has the wrong version.");
315 return false;
316 }
318 size_t info_size = _header->_paths_misc_info_size;
319 _paths_misc_info = NEW_C_HEAP_ARRAY_RETURN_NULL(char, info_size, mtClass);
320 if (_paths_misc_info == NULL) {
321 fail_continue("Unable to read the file header.");
322 return false;
323 }
324 n = os::read(fd, _paths_misc_info, (unsigned int)info_size);
325 if (n != info_size) {
326 fail_continue("Unable to read the shared path info header.");
327 FREE_C_HEAP_ARRAY(char, _paths_misc_info, mtClass);
328 _paths_misc_info = NULL;
329 return false;
330 }
332 size_t len = lseek(fd, 0, SEEK_END);
333 struct FileMapInfo::FileMapHeader::space_info* si =
334 &_header->_space[MetaspaceShared::mc];
335 if (si->_file_offset >= len || len - si->_file_offset < si->_used) {
336 fail_continue("The shared archive file has been truncated.");
337 return false;
338 }
340 _file_offset += (long)n;
341 return true;
342 }
345 // Read the FileMapInfo information from the file.
346 bool FileMapInfo::open_for_read() {
347 _full_path = Arguments::GetSharedArchivePath();
348 int fd = open(_full_path, O_RDONLY | O_BINARY, 0);
349 if (fd < 0) {
350 if (errno == ENOENT) {
351 // Not locating the shared archive is ok.
352 fail_continue("Specified shared archive not found.");
353 } else {
354 fail_continue("Failed to open shared archive file (%s).",
355 strerror(errno));
356 }
357 return false;
358 }
360 _fd = fd;
361 _file_open = true;
362 return true;
363 }
366 // Write the FileMapInfo information to the file.
368 void FileMapInfo::open_for_write() {
369 _full_path = Arguments::GetSharedArchivePath();
370 if (PrintSharedSpaces) {
371 tty->print_cr("Dumping shared data to file: ");
372 tty->print_cr(" %s", _full_path);
373 }
375 #ifdef _WINDOWS // On Windows, need WRITE permission to remove the file.
376 chmod(_full_path, _S_IREAD | _S_IWRITE);
377 #endif
379 // Use remove() to delete the existing file because, on Unix, this will
380 // allow processes that have it open continued access to the file.
381 remove(_full_path);
382 int fd = open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0444);
383 if (fd < 0) {
384 fail_stop("Unable to create shared archive file %s.", _full_path);
385 }
386 _fd = fd;
387 _file_offset = 0;
388 _file_open = true;
389 }
392 // Write the header to the file, seek to the next allocation boundary.
394 void FileMapInfo::write_header() {
395 int info_size = ClassLoader::get_shared_paths_misc_info_size();
397 _header->_paths_misc_info_size = info_size;
399 align_file_position();
400 size_t sz = _header->data_size();
401 char* addr = _header->data();
402 write_bytes(addr, (int)sz); // skip the C++ vtable
403 write_bytes(ClassLoader::get_shared_paths_misc_info(), info_size);
404 align_file_position();
405 }
408 // Dump shared spaces to file.
410 void FileMapInfo::write_space(int i, Metaspace* space, bool read_only) {
411 align_file_position();
412 size_t used = space->used_bytes_slow(Metaspace::NonClassType);
413 size_t capacity = space->capacity_bytes_slow(Metaspace::NonClassType);
414 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i];
415 write_region(i, (char*)space->bottom(), used, capacity, read_only, false);
416 }
419 // Dump region to file.
421 void FileMapInfo::write_region(int region, char* base, size_t size,
422 size_t capacity, bool read_only,
423 bool allow_exec) {
424 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[region];
426 if (_file_open) {
427 guarantee(si->_file_offset == _file_offset, "file offset mismatch.");
428 if (PrintSharedSpaces) {
429 tty->print_cr("Shared file region %d: 0x%6x bytes, addr " INTPTR_FORMAT
430 " file offset 0x%6x", region, size, base, _file_offset);
431 }
432 } else {
433 si->_file_offset = _file_offset;
434 }
435 si->_base = base;
436 si->_used = size;
437 si->_capacity = capacity;
438 si->_read_only = read_only;
439 si->_allow_exec = allow_exec;
440 si->_crc = ClassLoader::crc32(0, base, (jint)size);
441 write_bytes_aligned(base, (int)size);
442 }
445 // Dump bytes to file -- at the current file position.
447 void FileMapInfo::write_bytes(const void* buffer, int nbytes) {
448 if (_file_open) {
449 int n = ::write(_fd, buffer, nbytes);
450 if (n != nbytes) {
451 // It is dangerous to leave the corrupted shared archive file around,
452 // close and remove the file. See bug 6372906.
453 close();
454 remove(_full_path);
455 fail_stop("Unable to write to shared archive file.", NULL);
456 }
457 }
458 _file_offset += nbytes;
459 }
462 // Align file position to an allocation unit boundary.
464 void FileMapInfo::align_file_position() {
465 size_t new_file_offset = align_size_up(_file_offset,
466 os::vm_allocation_granularity());
467 if (new_file_offset != _file_offset) {
468 _file_offset = new_file_offset;
469 if (_file_open) {
470 // Seek one byte back from the target and write a byte to insure
471 // that the written file is the correct length.
472 _file_offset -= 1;
473 if (lseek(_fd, (long)_file_offset, SEEK_SET) < 0) {
474 fail_stop("Unable to seek.", NULL);
475 }
476 char zero = 0;
477 write_bytes(&zero, 1);
478 }
479 }
480 }
483 // Dump bytes to file -- at the current file position.
485 void FileMapInfo::write_bytes_aligned(const void* buffer, int nbytes) {
486 align_file_position();
487 write_bytes(buffer, nbytes);
488 align_file_position();
489 }
492 // Close the shared archive file. This does NOT unmap mapped regions.
494 void FileMapInfo::close() {
495 if (_file_open) {
496 if (::close(_fd) < 0) {
497 fail_stop("Unable to close the shared archive file.");
498 }
499 _file_open = false;
500 _fd = -1;
501 }
502 }
505 // JVM/TI RedefineClasses() support:
506 // Remap the shared readonly space to shared readwrite, private.
507 bool FileMapInfo::remap_shared_readonly_as_readwrite() {
508 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[0];
509 if (!si->_read_only) {
510 // the space is already readwrite so we are done
511 return true;
512 }
513 size_t used = si->_used;
514 size_t size = align_size_up(used, os::vm_allocation_granularity());
515 if (!open_for_read()) {
516 return false;
517 }
518 char *base = os::remap_memory(_fd, _full_path, si->_file_offset,
519 si->_base, size, false /* !read_only */,
520 si->_allow_exec);
521 close();
522 if (base == NULL) {
523 fail_continue("Unable to remap shared readonly space (errno=%d).", errno);
524 return false;
525 }
526 if (base != si->_base) {
527 fail_continue("Unable to remap shared readonly space at required address.");
528 return false;
529 }
530 si->_read_only = false;
531 return true;
532 }
534 // Map the whole region at once, assumed to be allocated contiguously.
535 ReservedSpace FileMapInfo::reserve_shared_memory() {
536 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[0];
537 char* requested_addr = si->_base;
539 size_t size = FileMapInfo::shared_spaces_size();
541 // Reserve the space first, then map otherwise map will go right over some
542 // other reserved memory (like the code cache).
543 ReservedSpace rs(size, os::vm_allocation_granularity(), false, requested_addr);
544 if (!rs.is_reserved()) {
545 fail_continue(err_msg("Unable to reserve shared space at required address " INTPTR_FORMAT, requested_addr));
546 return rs;
547 }
548 // the reserved virtual memory is for mapping class data sharing archive
549 MemTracker::record_virtual_memory_type((address)rs.base(), mtClassShared);
551 return rs;
552 }
554 // Memory map a region in the address space.
555 static const char* shared_region_name[] = { "ReadOnly", "ReadWrite", "MiscData", "MiscCode"};
557 char* FileMapInfo::map_region(int i) {
558 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i];
559 size_t used = si->_used;
560 size_t alignment = os::vm_allocation_granularity();
561 size_t size = align_size_up(used, alignment);
562 char *requested_addr = si->_base;
564 // map the contents of the CDS archive in this memory
565 char *base = os::map_memory(_fd, _full_path, si->_file_offset,
566 requested_addr, size, si->_read_only,
567 si->_allow_exec);
568 if (base == NULL || base != si->_base) {
569 fail_continue(err_msg("Unable to map %s shared space at required address.", shared_region_name[i]));
570 return NULL;
571 }
572 #ifdef _WINDOWS
573 // This call is Windows-only because the memory_type gets recorded for the other platforms
574 // in method FileMapInfo::reserve_shared_memory(), which is not called on Windows.
575 MemTracker::record_virtual_memory_type((address)base, mtClassShared);
576 #endif
577 return base;
578 }
580 bool FileMapInfo::verify_region_checksum(int i) {
581 if (!VerifySharedSpaces) {
582 return true;
583 }
584 const char* buf = _header->_space[i]._base;
585 size_t sz = _header->_space[i]._used;
586 int crc = ClassLoader::crc32(0, buf, (jint)sz);
587 if (crc != _header->_space[i]._crc) {
588 fail_continue("Checksum verification failed.");
589 return false;
590 }
591 return true;
592 }
594 // Unmap a memory region in the address space.
596 void FileMapInfo::unmap_region(int i) {
597 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i];
598 size_t used = si->_used;
599 size_t size = align_size_up(used, os::vm_allocation_granularity());
600 if (!os::unmap_memory(si->_base, size)) {
601 fail_stop("Unable to unmap shared space.");
602 }
603 }
606 void FileMapInfo::assert_mark(bool check) {
607 if (!check) {
608 fail_stop("Mark mismatch while restoring from shared file.", NULL);
609 }
610 }
613 FileMapInfo* FileMapInfo::_current_info = NULL;
614 SharedClassPathEntry* FileMapInfo::_classpath_entry_table = NULL;
615 int FileMapInfo::_classpath_entry_table_size = 0;
616 size_t FileMapInfo::_classpath_entry_size = 0x1234baad;
617 bool FileMapInfo::_validating_classpath_entry_table = false;
619 // Open the shared archive file, read and validate the header
620 // information (version, boot classpath, etc.). If initialization
621 // fails, shared spaces are disabled and the file is closed. [See
622 // fail_continue.]
623 //
624 // Validation of the archive is done in two steps:
625 //
626 // [1] validate_header() - done here. This checks the header, including _paths_misc_info.
627 // [2] validate_classpath_entry_table - this is done later, because the table is in the RW
628 // region of the archive, which is not mapped yet.
629 bool FileMapInfo::initialize() {
630 assert(UseSharedSpaces, "UseSharedSpaces expected.");
632 if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space()) {
633 fail_continue("Tool agent requires sharing to be disabled.");
634 return false;
635 }
637 if (!open_for_read()) {
638 return false;
639 }
641 init_from_file(_fd);
642 if (!validate_header()) {
643 return false;
644 }
646 SharedReadOnlySize = _header->_space[0]._capacity;
647 SharedReadWriteSize = _header->_space[1]._capacity;
648 SharedMiscDataSize = _header->_space[2]._capacity;
649 SharedMiscCodeSize = _header->_space[3]._capacity;
650 return true;
651 }
653 int FileMapInfo::FileMapHeader::compute_crc() {
654 char* header = data();
655 // start computing from the field after _crc
656 char* buf = (char*)&_crc + sizeof(int);
657 size_t sz = data_size() - (buf - header);
658 int crc = ClassLoader::crc32(0, buf, (jint)sz);
659 return crc;
660 }
662 int FileMapInfo::compute_header_crc() {
663 return _header->compute_crc();
664 }
666 bool FileMapInfo::FileMapHeader::validate() {
667 if (_magic != (int)0xf00baba2) {
668 FileMapInfo::fail_continue("The shared archive file has a bad magic number.");
669 return false;
670 }
671 if (VerifySharedSpaces && compute_crc() != _crc) {
672 fail_continue("Header checksum verification failed.");
673 return false;
674 }
675 if (_version != current_version()) {
676 FileMapInfo::fail_continue("The shared archive file is the wrong version.");
678 return false;
679 }
680 char header_version[JVM_IDENT_MAX];
681 get_header_version(header_version);
682 if (strncmp(_jvm_ident, header_version, JVM_IDENT_MAX-1) != 0) {
683 if (TraceClassPaths) {
684 tty->print_cr("Expected: %s", header_version);
685 tty->print_cr("Actual: %s", _jvm_ident);
686 }
687 FileMapInfo::fail_continue("The shared archive file was created by a different"
688 " version or build of HotSpot");
689 return false;
690 }
691 if (_obj_alignment != ObjectAlignmentInBytes) {
692 FileMapInfo::fail_continue("The shared archive file's ObjectAlignmentInBytes of %d"
693 " does not equal the current ObjectAlignmentInBytes of %d.",
694 _obj_alignment, ObjectAlignmentInBytes);
695 return false;
696 }
698 return true;
699 }
701 bool FileMapInfo::validate_header() {
702 bool status = _header->validate();
704 if (status) {
705 if (!ClassLoader::check_shared_paths_misc_info(_paths_misc_info, _header->_paths_misc_info_size)) {
706 if (!PrintSharedArchiveAndExit) {
707 fail_continue("shared class paths mismatch (hint: enable -XX:+TraceClassPaths to diagnose the failure)");
708 status = false;
709 }
710 }
711 }
713 if (_paths_misc_info != NULL) {
714 FREE_C_HEAP_ARRAY(char, _paths_misc_info, mtClass);
715 _paths_misc_info = NULL;
716 }
717 return status;
718 }
720 // The following method is provided to see whether a given pointer
721 // falls in the mapped shared space.
722 // Param:
723 // p, The given pointer
724 // Return:
725 // True if the p is within the mapped shared space, otherwise, false.
726 bool FileMapInfo::is_in_shared_space(const void* p) {
727 for (int i = 0; i < MetaspaceShared::n_regions; i++) {
728 if (p >= _header->_space[i]._base &&
729 p < _header->_space[i]._base + _header->_space[i]._used) {
730 return true;
731 }
732 }
734 return false;
735 }
737 void FileMapInfo::print_shared_spaces() {
738 gclog_or_tty->print_cr("Shared Spaces:");
739 for (int i = 0; i < MetaspaceShared::n_regions; i++) {
740 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i];
741 gclog_or_tty->print(" %s " INTPTR_FORMAT "-" INTPTR_FORMAT,
742 shared_region_name[i],
743 si->_base, si->_base + si->_used);
744 }
745 }
747 // Unmap mapped regions of shared space.
748 void FileMapInfo::stop_sharing_and_unmap(const char* msg) {
749 FileMapInfo *map_info = FileMapInfo::current_info();
750 if (map_info) {
751 map_info->fail_continue(msg);
752 for (int i = 0; i < MetaspaceShared::n_regions; i++) {
753 if (map_info->_header->_space[i]._base != NULL) {
754 map_info->unmap_region(i);
755 map_info->_header->_space[i]._base = NULL;
756 }
757 }
758 } else if (DumpSharedSpaces) {
759 fail_stop(msg, NULL);
760 }
761 }