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