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 }