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 = (FileMapHeader*)os::malloc(sizeof(FileMapHeader), mtInternal);
163 _header->_version = INVALID_CDS_ARCHIVE_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 FileMapHeader::populate(FileMapInfo* mapinfo, size_t alignment) {
177 _magic = CDS_ARCHIVE_MAGIC;
178 _version = CURRENT_CDS_ARCHIVE_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, bool is_modules_image, 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 _type = dir_entry;
217 } else {
218 // The timestamp of the modules_image is not checked at runtime.
219 if (is_modules_image) {
220 _type = modules_image_entry;
221 } else {
222 _type = jar_entry;
223 _timestamp = st.st_mtime;
224 }
225 _filesize = st.st_size;
226 }
227 } else {
228 // The file/dir must exist, or it would not have been added
229 // into ClassLoader::classpath_entry().
230 //
231 // If we can't access a jar file in the boot path, then we can't
232 // make assumptions about where classes get loaded from.
233 FileMapInfo::fail_stop("Unable to open file %s.", name);
234 }
235
236 size_t len = strlen(name) + 1;
237 _name = MetadataFactory::new_array<char>(ClassLoaderData::the_null_class_loader_data(), (int)len, THREAD);
238 strcpy(_name->data(), name);
239 }
240
241 bool SharedClassPathEntry::validate(bool is_class_path) {
242 assert(UseSharedSpaces, "runtime only");
243
244 struct stat st;
245 const char* name;
246
247 // In order to validate the runtime modules image file size against the archived
248 // size information, we need to obtain the runtime modules image path. The recorded
249 // dump time modules image path in the archive may be different from the runtime path
250 // if the JDK image has beed moved after generating the archive.
251 if (is_modules_image()) {
252 name = ClassLoader::get_jrt_entry()->name();
253 } else {
254 name = this->name();
255 }
256
257 bool ok = true;
258 log_info(class, path)("checking shared classpath entry: %s", name);
259 if (os::stat(name, &st) != 0 && is_class_path) {
260 // If the archived module path entry does not exist at runtime, it is not fatal
261 // (no need to invalid the shared archive) because the shared runtime visibility check
262 // filters out any archived module classes that do not have a matching runtime
263 // module path location.
264 FileMapInfo::fail_continue("Required classpath entry does not exist: %s", name);
265 ok = false;
266 } else if (is_dir()) {
267 if (!os::dir_is_empty(name)) {
268 FileMapInfo::fail_continue("directory is not empty: %s", name);
269 ok = false;
270 }
271 } else if ((has_timestamp() && _timestamp != st.st_mtime) ||
272 _filesize != st.st_size) {
273 ok = false;
274 if (PrintSharedArchiveAndExit) {
275 FileMapInfo::fail_continue(_timestamp != st.st_mtime ?
276 "Timestamp mismatch" :
277 "File size mismatch");
278 } else {
279 FileMapInfo::fail_continue("A jar file is not the one used while building"
280 " the shared archive file: %s", name);
281 }
282 }
283 return ok;
284 }
285
286 void SharedClassPathEntry::metaspace_pointers_do(MetaspaceClosure* it) {
287 it->push(&_name);
288 it->push(&_manifest);
289 }
290
291 void FileMapInfo::allocate_shared_path_table() {
292 assert(DumpSharedSpaces, "Sanity");
293
294 Thread* THREAD = Thread::current();
295 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
296 ClassPathEntry* jrt = ClassLoader::get_jrt_entry();
297
298 assert(jrt != NULL,
299 "No modular java runtime image present when allocating the CDS classpath entry table");
300
301 size_t entry_size = sizeof(SharedClassPathEntry); // assert ( should be 8 byte aligned??)
302 int num_boot_classpath_entries = ClassLoader::num_boot_classpath_entries();
303 int num_app_classpath_entries = ClassLoader::num_app_classpath_entries();
304 int num_module_path_entries = ClassLoader::num_module_path_entries();
305 int num_entries = num_boot_classpath_entries + num_app_classpath_entries + num_module_path_entries;
306 size_t bytes = entry_size * num_entries;
307
308 _shared_path_table = MetadataFactory::new_array<u8>(loader_data, (int)(bytes + 7 / 8), THREAD);
309 _shared_path_table_size = num_entries;
310 _shared_path_entry_size = entry_size;
311
312 // 1. boot class path
313 int i = 0;
314 ClassPathEntry* cpe = jrt;
315 while (cpe != NULL) {
316 bool is_jrt = (cpe == jrt);
317 const char* type = (is_jrt ? "jrt" : (cpe->is_jar_file() ? "jar" : "dir"));
318 log_info(class, path)("add main shared path (%s) %s", type, cpe->name());
319 SharedClassPathEntry* ent = shared_path(i);
320 ent->init(cpe->name(), is_jrt, THREAD);
321 if (!is_jrt) { // No need to do the modules image.
322 EXCEPTION_MARK; // The following call should never throw, but would exit VM on error.
323 update_shared_classpath(cpe, ent, THREAD);
324 }
325 cpe = ClassLoader::get_next_boot_classpath_entry(cpe);
326 i++;
327 }
328 assert(i == num_boot_classpath_entries,
329 "number of boot class path entry mismatch");
330
331 // 2. app class path
332 ClassPathEntry *acpe = ClassLoader::app_classpath_entries();
333 while (acpe != NULL) {
334 log_info(class, path)("add app shared path %s", acpe->name());
335 SharedClassPathEntry* ent = shared_path(i);
336 ent->init(acpe->name(), false, THREAD);
337 EXCEPTION_MARK;
338 update_shared_classpath(acpe, ent, THREAD);
339 acpe = acpe->next();
340 i++;
341 }
342
343 // 3. module path
344 ClassPathEntry *mpe = ClassLoader::module_path_entries();
345 while (mpe != NULL) {
346 log_info(class, path)("add module path %s",mpe->name());
347 SharedClassPathEntry* ent = shared_path(i);
348 ent->init(mpe->name(), false, THREAD);
349 EXCEPTION_MARK;
350 update_shared_classpath(mpe, ent, THREAD);
351 mpe = mpe->next();
352 i++;
353 }
354 assert(i == num_entries, "number of shared path entry mismatch");
355 }
356
357 void FileMapInfo::check_nonempty_dir_in_shared_path_table() {
358 assert(DumpSharedSpaces, "dump time only");
359
360 bool has_nonempty_dir = false;
361
362 int end = _shared_path_table_size;
363 if (!ClassLoaderExt::has_platform_or_app_classes()) {
364 // only check the boot path if no app class is loaded
365 end = ClassLoaderExt::app_class_paths_start_index();
366 }
367
368 for (int i = 0; i < end; i++) {
369 SharedClassPathEntry *e = shared_path(i);
370 if (e->is_dir()) {
371 const char* path = e->name();
372 if (!os::dir_is_empty(path)) {
373 tty->print_cr("Error: non-empty directory '%s'", path);
374 has_nonempty_dir = true;
375 }
376 }
377 }
378
379 if (has_nonempty_dir) {
380 ClassLoader::exit_with_path_failure("Cannot have non-empty directory in paths", NULL);
381 }
382 }
383
384 class ManifestStream: public ResourceObj {
385 private:
386 u1* _buffer_start; // Buffer bottom
387 u1* _buffer_end; // Buffer top (one past last element)
388 u1* _current; // Current buffer position
389
390 public:
391 // Constructor
392 ManifestStream(u1* buffer, int length) : _buffer_start(buffer),
393 _current(buffer) {
394 _buffer_end = buffer + length;
395 }
396
397 static bool is_attr(u1* attr, const char* name) {
398 return strncmp((const char*)attr, name, strlen(name)) == 0;
399 }
400
401 static char* copy_attr(u1* value, size_t len) {
402 char* buf = NEW_RESOURCE_ARRAY(char, len + 1);
403 strncpy(buf, (char*)value, len);
404 buf[len] = 0;
405 return buf;
406 }
407
408 // The return value indicates if the JAR is signed or not
409 bool check_is_signed() {
410 u1* attr = _current;
411 bool isSigned = false;
412 while (_current < _buffer_end) {
413 if (*_current == '\n') {
414 *_current = '\0';
415 u1* value = (u1*)strchr((char*)attr, ':');
416 if (value != NULL) {
417 assert(*(value+1) == ' ', "Unrecognized format" );
418 if (strstr((char*)attr, "-Digest") != NULL) {
419 isSigned = true;
420 break;
421 }
422 }
423 *_current = '\n'; // restore
424 attr = _current + 1;
425 }
426 _current ++;
427 }
428 return isSigned;
429 }
430 };
431
432 void FileMapInfo::update_shared_classpath(ClassPathEntry *cpe, SharedClassPathEntry* ent, TRAPS) {
433 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
434 ResourceMark rm(THREAD);
435 jint manifest_size;
436
437 if (cpe->is_jar_file()) {
438 assert(ent->is_jar(), "the shared class path entry is not a JAR file");
439 char* manifest = ClassLoaderExt::read_manifest(cpe, &manifest_size, CHECK);
440 if (manifest != NULL) {
441 ManifestStream* stream = new ManifestStream((u1*)manifest,
442 manifest_size);
443 if (stream->check_is_signed()) {
444 ent->set_is_signed();
445 } else {
446 // Copy the manifest into the shared archive
447 manifest = ClassLoaderExt::read_raw_manifest(cpe, &manifest_size, CHECK);
448 Array<u1>* buf = MetadataFactory::new_array<u1>(loader_data,
449 manifest_size,
450 THREAD);
451 char* p = (char*)(buf->data());
452 memcpy(p, manifest, manifest_size);
453 ent->set_manifest(buf);
454 }
455 }
456 }
457 }
458
459
460 bool FileMapInfo::validate_shared_path_table() {
461 assert(UseSharedSpaces, "runtime only");
462
463 _validating_shared_path_table = true;
464 _shared_path_table = _header->_shared_path_table;
465 _shared_path_entry_size = _header->_shared_path_entry_size;
466 _shared_path_table_size = _header->_shared_path_table_size;
467
468 int module_paths_start_index = _header->_app_module_paths_start_index;
469
470 // If the shared archive contain app or platform classes, validate all entries
471 // in the shared path table. Otherwise, only validate the boot path entries (with
472 // entry index < _app_class_paths_start_index).
473 int count = _header->has_platform_or_app_classes() ?
474 _shared_path_table_size : _header->_app_class_paths_start_index;
475
476 for (int i=0; i<count; i++) {
477 if (i < module_paths_start_index) {
478 if (shared_path(i)->validate()) {
479 log_info(class, path)("ok");
480 }
481 } else if (i >= module_paths_start_index) {
482 if (shared_path(i)->validate(false /* not a class path entry */)) {
483 log_info(class, path)("ok");
484 }
485 } else if (!PrintSharedArchiveAndExit) {
486 _validating_shared_path_table = false;
487 _shared_path_table = NULL;
488 _shared_path_table_size = 0;
489 return false;
490 }
491 }
492
493 _validating_shared_path_table = false;
494 return true;
495 }
496
497 // Read the FileMapInfo information from the file.
498
499 bool FileMapInfo::init_from_file(int fd) {
500 size_t sz = sizeof(FileMapHeader);
501 size_t n = os::read(fd, _header, (unsigned int)sz);
502 if (n != sz) {
503 fail_continue("Unable to read the file header.");
504 return false;
505 }
506 if (_header->_version != CURRENT_CDS_ARCHIVE_VERSION) {
507 fail_continue("The shared archive file has the wrong version.");
508 return false;
509 }
510 _file_offset = (long)n;
511
512 size_t info_size = _header->_paths_misc_info_size;
513 _paths_misc_info = NEW_C_HEAP_ARRAY_RETURN_NULL(char, info_size, mtClass);
514 if (_paths_misc_info == NULL) {
515 fail_continue("Unable to read the file header.");
516 return false;
517 }
518 n = os::read(fd, _paths_misc_info, (unsigned int)info_size);
519 if (n != info_size) {
520 fail_continue("Unable to read the shared path info header.");
521 FREE_C_HEAP_ARRAY(char, _paths_misc_info);
522 _paths_misc_info = NULL;
523 return false;
524 }
525
526 size_t len = lseek(fd, 0, SEEK_END);
527 CDSFileMapRegion* si = space_at(MetaspaceShared::last_valid_region);
528 // The last space might be empty
529 if (si->_file_offset > len || len - si->_file_offset < si->_used) {
530 fail_continue("The shared archive file has been truncated.");
531 return false;
532 }
533
534 _file_offset += (long)n;
535 return true;
536 }
537
538
539 // Read the FileMapInfo information from the file.
540 bool FileMapInfo::open_for_read() {
541 _full_path = Arguments::GetSharedArchivePath();
542 int fd = open(_full_path, O_RDONLY | O_BINARY, 0);
543 if (fd < 0) {
544 if (errno == ENOENT) {
545 // Not locating the shared archive is ok.
546 fail_continue("Specified shared archive not found.");
547 } else {
548 fail_continue("Failed to open shared archive file (%s).",
549 os::strerror(errno));
550 }
551 return false;
552 }
553
554 _fd = fd;
555 _file_open = true;
556 return true;
557 }
558
559
560 // Write the FileMapInfo information to the file.
561
562 void FileMapInfo::open_for_write() {
563 _full_path = Arguments::GetSharedArchivePath();
564 LogMessage(cds) msg;
565 if (msg.is_info()) {
566 msg.info("Dumping shared data to file: ");
567 msg.info(" %s", _full_path);
568 }
569
570 #ifdef _WINDOWS // On Windows, need WRITE permission to remove the file.
571 chmod(_full_path, _S_IREAD | _S_IWRITE);
572 #endif
573
574 // Use remove() to delete the existing file because, on Unix, this will
575 // allow processes that have it open continued access to the file.
576 remove(_full_path);
577 int fd = open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0444);
578 if (fd < 0) {
579 fail_stop("Unable to create shared archive file %s: (%s).", _full_path,
580 os::strerror(errno));
581 }
582 _fd = fd;
583 _file_offset = 0;
584 _file_open = true;
585 }
586
587
588 // Write the header to the file, seek to the next allocation boundary.
589
590 void FileMapInfo::write_header() {
591 int info_size = ClassLoader::get_shared_paths_misc_info_size();
592
593 _header->_paths_misc_info_size = info_size;
594
595 align_file_position();
596 write_bytes(_header, sizeof(FileMapHeader));
597 write_bytes(ClassLoader::get_shared_paths_misc_info(), (size_t)info_size);
598 align_file_position();
599 }
600
601
602 // Dump region to file.
603
604 void FileMapInfo::write_region(int region, char* base, size_t size,
605 bool read_only, bool allow_exec) {
606 CDSFileMapRegion* si = space_at(region);
607
608 if (_file_open) {
609 guarantee(si->_file_offset == _file_offset, "file offset mismatch.");
610 log_info(cds)("Shared file region %d: " SIZE_FORMAT_HEX_W(08)
611 " bytes, addr " INTPTR_FORMAT " file offset " SIZE_FORMAT_HEX_W(08),
612 region, size, p2i(base), _file_offset);
613 } else {
614 si->_file_offset = _file_offset;
615 }
616 if (MetaspaceShared::is_heap_region(region)) {
617 assert((base - (char*)Universe::narrow_oop_base()) % HeapWordSize == 0, "Sanity");
618 if (base != NULL) {
619 si->_addr._offset = (intx)CompressedOops::encode_not_null((oop)base);
620 } else {
621 si->_addr._offset = 0;
622 }
623 } else {
624 si->_addr._base = base;
625 }
626 si->_used = size;
627 si->_read_only = read_only;
628 si->_allow_exec = allow_exec;
629 si->_crc = ClassLoader::crc32(0, base, (jint)size);
630 if (base != NULL) {
631 write_bytes_aligned(base, size);
632 }
633 }
634
635 // Write out the given archive heap memory regions. GC code combines multiple
636 // consecutive archive GC regions into one MemRegion whenever possible and
637 // produces the 'heap_mem' array.
638 //
639 // If the archive heap memory size is smaller than a single dump time GC region
640 // size, there is only one MemRegion in the array.
641 //
642 // If the archive heap memory size is bigger than one dump time GC region size,
643 // the 'heap_mem' array may contain more than one consolidated MemRegions. When
644 // the first/bottom archive GC region is a partial GC region (with the empty
645 // portion at the higher address within the region), one MemRegion is used for
646 // the bottom partial archive GC region. The rest of the consecutive archive
647 // GC regions are combined into another MemRegion.
648 //
649 // Here's the mapping from (archive heap GC regions) -> (GrowableArray<MemRegion> *regions).
650 // + We have 1 or more archive heap regions: ah0, ah1, ah2 ..... ahn
651 // + We have 1 or 2 consolidated heap memory regions: r0 and r1
652 //
653 // If there's a single archive GC region (ah0), then r0 == ah0, and r1 is empty.
654 // Otherwise:
655 //
656 // "X" represented space that's occupied by heap objects.
657 // "_" represented unused spaced in the heap region.
658 //
659 //
660 // |ah0 | ah1 | ah2| ...... | ahn |
661 // |XXXXXX|__ |XXXXX|XXXX|XXXXXXXX|XXXX|
662 // |<-r0->| |<- r1 ----------------->|
663 // ^^^
664 // |
665 // +-- gap
666 size_t FileMapInfo::write_archive_heap_regions(GrowableArray<MemRegion> *heap_mem,
667 int first_region_id, int max_num_regions) {
668 assert(max_num_regions <= 2, "Only support maximum 2 memory regions");
669
670 int arr_len = heap_mem == NULL ? 0 : heap_mem->length();
671 if(arr_len > max_num_regions) {
672 fail_stop("Unable to write archive heap memory regions: "
673 "number of memory regions exceeds maximum due to fragmentation");
674 }
675
676 size_t total_size = 0;
677 for (int i = first_region_id, arr_idx = 0;
678 i < first_region_id + max_num_regions;
679 i++, arr_idx++) {
680 char* start = NULL;
681 size_t size = 0;
682 if (arr_idx < arr_len) {
683 start = (char*)heap_mem->at(arr_idx).start();
684 size = heap_mem->at(arr_idx).byte_size();
685 total_size += size;
686 }
687
688 log_info(cds)("Archive heap region %d " INTPTR_FORMAT " - " INTPTR_FORMAT " = " SIZE_FORMAT_W(8) " bytes",
689 i, p2i(start), p2i(start + size), size);
690 write_region(i, start, size, false, false);
691 }
692 return total_size;
693 }
694
695 // Dump bytes to file -- at the current file position.
696
697 void FileMapInfo::write_bytes(const void* buffer, size_t nbytes) {
698 if (_file_open) {
699 size_t n = os::write(_fd, buffer, (unsigned int)nbytes);
700 if (n != nbytes) {
701 // It is dangerous to leave the corrupted shared archive file around,
702 // close and remove the file. See bug 6372906.
703 close();
704 remove(_full_path);
705 fail_stop("Unable to write to shared archive file.");
706 }
707 }
708 _file_offset += nbytes;
709 }
710
711
712 // Align file position to an allocation unit boundary.
713
714 void FileMapInfo::align_file_position() {
715 size_t new_file_offset = align_up(_file_offset,
716 os::vm_allocation_granularity());
717 if (new_file_offset != _file_offset) {
718 _file_offset = new_file_offset;
719 if (_file_open) {
720 // Seek one byte back from the target and write a byte to insure
721 // that the written file is the correct length.
722 _file_offset -= 1;
723 if (lseek(_fd, (long)_file_offset, SEEK_SET) < 0) {
724 fail_stop("Unable to seek.");
725 }
726 char zero = 0;
727 write_bytes(&zero, 1);
728 }
729 }
730 }
731
732
733 // Dump bytes to file -- at the current file position.
734
735 void FileMapInfo::write_bytes_aligned(const void* buffer, size_t nbytes) {
736 align_file_position();
737 write_bytes(buffer, nbytes);
738 align_file_position();
739 }
740
741
742 // Close the shared archive file. This does NOT unmap mapped regions.
743
744 void FileMapInfo::close() {
745 if (_file_open) {
746 if (::close(_fd) < 0) {
747 fail_stop("Unable to close the shared archive file.");
748 }
749 _file_open = false;
750 _fd = -1;
751 }
752 }
753
754
755 // JVM/TI RedefineClasses() support:
756 // Remap the shared readonly space to shared readwrite, private.
757 bool FileMapInfo::remap_shared_readonly_as_readwrite() {
758 int idx = MetaspaceShared::ro;
759 CDSFileMapRegion* si = space_at(idx);
760 if (!si->_read_only) {
761 // the space is already readwrite so we are done
762 return true;
763 }
764 size_t used = si->_used;
765 size_t size = align_up(used, os::vm_allocation_granularity());
766 if (!open_for_read()) {
767 return false;
768 }
769 char *addr = _header->region_addr(idx);
770 char *base = os::remap_memory(_fd, _full_path, si->_file_offset,
771 addr, size, false /* !read_only */,
772 si->_allow_exec);
773 close();
774 if (base == NULL) {
775 fail_continue("Unable to remap shared readonly space (errno=%d).", errno);
776 return false;
777 }
778 if (base != addr) {
779 fail_continue("Unable to remap shared readonly space at required address.");
780 return false;
781 }
782 si->_read_only = false;
783 return true;
784 }
785
786 // Map the whole region at once, assumed to be allocated contiguously.
787 ReservedSpace FileMapInfo::reserve_shared_memory() {
788 char* requested_addr = _header->region_addr(0);
789 size_t size = FileMapInfo::core_spaces_size();
790
791 // Reserve the space first, then map otherwise map will go right over some
792 // other reserved memory (like the code cache).
793 ReservedSpace rs(size, os::vm_allocation_granularity(), false, requested_addr);
794 if (!rs.is_reserved()) {
795 fail_continue("Unable to reserve shared space at required address "
796 INTPTR_FORMAT, p2i(requested_addr));
797 return rs;
798 }
799 // the reserved virtual memory is for mapping class data sharing archive
800 MemTracker::record_virtual_memory_type((address)rs.base(), mtClassShared);
801
802 return rs;
803 }
804
805 // Memory map a region in the address space.
806 static const char* shared_region_name[] = { "MiscData", "ReadWrite", "ReadOnly", "MiscCode", "OptionalData",
807 "String1", "String2", "OpenArchive1", "OpenArchive2" };
808
809 char* FileMapInfo::map_region(int i, char** top_ret) {
810 assert(!MetaspaceShared::is_heap_region(i), "sanity");
811 CDSFileMapRegion* si = space_at(i);
812 size_t used = si->_used;
813 size_t alignment = os::vm_allocation_granularity();
814 size_t size = align_up(used, alignment);
815 char *requested_addr = _header->region_addr(i);
816
817 // If a tool agent is in use (debugging enabled), we must map the address space RW
818 if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space()) {
819 si->_read_only = false;
820 }
821
822 // map the contents of the CDS archive in this memory
823 char *base = os::map_memory(_fd, _full_path, si->_file_offset,
824 requested_addr, size, si->_read_only,
825 si->_allow_exec);
826 if (base == NULL || base != requested_addr) {
827 fail_continue("Unable to map %s shared space at required address.", shared_region_name[i]);
828 return NULL;
829 }
830 #ifdef _WINDOWS
831 // This call is Windows-only because the memory_type gets recorded for the other platforms
832 // in method FileMapInfo::reserve_shared_memory(), which is not called on Windows.
833 MemTracker::record_virtual_memory_type((address)base, mtClassShared);
834 #endif
835
836
837 if (!verify_region_checksum(i)) {
838 return NULL;
839 }
840
841 *top_ret = base + size;
842 return base;
843 }
844
845 static MemRegion *string_ranges = NULL;
846 static MemRegion *open_archive_heap_ranges = NULL;
847 static int num_string_ranges = 0;
848 static int num_open_archive_heap_ranges = 0;
849
850 #if INCLUDE_CDS_JAVA_HEAP
851 //
852 // Map the shared string objects and open archive heap objects to the runtime
853 // java heap.
854 //
855 // The shared strings are mapped near the runtime java heap top. The
856 // mapped strings contain no out-going references to any other java heap
857 // regions. GC does not write into the mapped shared strings.
858 //
859 // The open archive heap objects are mapped below the shared strings in
860 // the runtime java heap. The mapped open archive heap data only contain
861 // references to the shared strings and open archive objects initially.
862 // During runtime execution, out-going references to any other java heap
863 // regions may be added. GC may mark and update references in the mapped
864 // open archive objects.
865 void FileMapInfo::map_heap_regions() {
866 if (MetaspaceShared::is_heap_object_archiving_allowed()) {
867 log_info(cds)("Archived narrow_oop_mode = %d, narrow_oop_base = " PTR_FORMAT ", narrow_oop_shift = %d",
868 narrow_oop_mode(), p2i(narrow_oop_base()), narrow_oop_shift());
869 log_info(cds)("Archived narrow_klass_base = " PTR_FORMAT ", narrow_klass_shift = %d",
870 p2i(narrow_klass_base()), narrow_klass_shift());
871
872 // Check that all the narrow oop and klass encodings match the archive
873 if (narrow_oop_mode() != Universe::narrow_oop_mode() ||
874 narrow_oop_base() != Universe::narrow_oop_base() ||
875 narrow_oop_shift() != Universe::narrow_oop_shift() ||
876 narrow_klass_base() != Universe::narrow_klass_base() ||
877 narrow_klass_shift() != Universe::narrow_klass_shift()) {
878 if (log_is_enabled(Info, cds) && space_at(MetaspaceShared::first_string)->_used > 0) {
879 log_info(cds)("Cached heap data from the CDS archive is being ignored. "
880 "The current CompressedOops/CompressedClassPointers encoding differs from "
881 "that archived due to heap size change. The archive was dumped using max heap "
882 "size " UINTX_FORMAT "M.", max_heap_size()/M);
883 log_info(cds)("Current narrow_oop_mode = %d, narrow_oop_base = " PTR_FORMAT ", narrow_oop_shift = %d",
884 Universe::narrow_oop_mode(), p2i(Universe::narrow_oop_base()),
885 Universe::narrow_oop_shift());
886 log_info(cds)("Current narrow_klass_base = " PTR_FORMAT ", narrow_klass_shift = %d",
887 p2i(Universe::narrow_klass_base()), Universe::narrow_klass_shift());
888 }
889 } else {
890 // First, map string regions as closed archive heap regions.
891 // GC does not write into the regions.
892 if (map_heap_data(&string_ranges,
893 MetaspaceShared::first_string,
894 MetaspaceShared::max_strings,
895 &num_string_ranges)) {
896 StringTable::set_shared_string_mapped();
897
898 // Now, map open_archive heap regions, GC can write into the regions.
899 if (map_heap_data(&open_archive_heap_ranges,
900 MetaspaceShared::first_open_archive_heap_region,
901 MetaspaceShared::max_open_archive_heap_region,
902 &num_open_archive_heap_ranges,
903 true /* open */)) {
904 MetaspaceShared::set_open_archive_heap_region_mapped();
905 }
906 }
907 }
908 } else {
909 if (log_is_enabled(Info, cds) && space_at(MetaspaceShared::first_string)->_used > 0) {
910 log_info(cds)("Cached heap data from the CDS archive is being ignored. UseG1GC, "
911 "UseCompressedOops and UseCompressedClassPointers are required.");
912 }
913 }
914
915 if (!StringTable::shared_string_mapped()) {
916 assert(string_ranges == NULL && num_string_ranges == 0, "sanity");
917 }
918
919 if (!MetaspaceShared::open_archive_heap_region_mapped()) {
920 assert(open_archive_heap_ranges == NULL && num_open_archive_heap_ranges == 0, "sanity");
921 }
922 }
923
924 bool FileMapInfo::map_heap_data(MemRegion **heap_mem, int first,
925 int max, int* num, bool is_open_archive) {
926 MemRegion * regions = new MemRegion[max];
927 CDSFileMapRegion* si;
928 int region_num = 0;
929
930 for (int i = first;
931 i < first + max; i++) {
932 si = space_at(i);
933 size_t used = si->_used;
934 if (used > 0) {
935 size_t size = used;
936 char* requested_addr = (char*)((void*)CompressedOops::decode_not_null(
937 (narrowOop)si->_addr._offset));
938 regions[region_num] = MemRegion((HeapWord*)requested_addr, size / HeapWordSize);
939 region_num ++;
940 }
941 }
942
943 if (region_num == 0) {
944 return false; // no archived java heap data
945 }
946
947 // Check that ranges are within the java heap
948 if (!G1CollectedHeap::heap()->check_archive_addresses(regions, region_num)) {
949 log_info(cds)("UseSharedSpaces: Unable to allocate region, "
950 "range is not within java heap.");
951 return false;
952 }
953
954 // allocate from java heap
955 if (!G1CollectedHeap::heap()->alloc_archive_regions(
956 regions, region_num, is_open_archive)) {
957 log_info(cds)("UseSharedSpaces: Unable to allocate region, "
958 "java heap range is already in use.");
959 return false;
960 }
961
962 // Map the archived heap data. No need to call MemTracker::record_virtual_memory_type()
963 // for mapped regions as they are part of the reserved java heap, which is
964 // already recorded.
965 for (int i = 0; i < region_num; i++) {
966 si = space_at(first + i);
967 char* addr = (char*)regions[i].start();
968 char* base = os::map_memory(_fd, _full_path, si->_file_offset,
969 addr, regions[i].byte_size(), si->_read_only,
970 si->_allow_exec);
971 if (base == NULL || base != addr) {
972 // dealloc the regions from java heap
973 dealloc_archive_heap_regions(regions, region_num);
974 log_info(cds)("UseSharedSpaces: Unable to map at required address in java heap.");
975 return false;
976 }
977 }
978
979 if (!verify_mapped_heap_regions(first, region_num)) {
980 // dealloc the regions from java heap
981 dealloc_archive_heap_regions(regions, region_num);
982 log_info(cds)("UseSharedSpaces: mapped heap regions are corrupt");
983 return false;
984 }
985
986 // the shared heap data is mapped successfully
987 *heap_mem = regions;
988 *num = region_num;
989 return true;
990 }
991
992 bool FileMapInfo::verify_mapped_heap_regions(int first, int num) {
993 for (int i = first;
994 i <= first + num; i++) {
995 if (!verify_region_checksum(i)) {
996 return false;
997 }
998 }
999 return true;
1000 }
1001
1002 void FileMapInfo::fixup_mapped_heap_regions() {
1003 // If any string regions were found, call the fill routine to make them parseable.
1004 // Note that string_ranges may be non-NULL even if no ranges were found.
1005 if (num_string_ranges != 0) {
1006 assert(string_ranges != NULL, "Null string_ranges array with non-zero count");
1007 G1CollectedHeap::heap()->fill_archive_regions(string_ranges, num_string_ranges);
1008 }
1009
1010 // do the same for mapped open archive heap regions
1011 if (num_open_archive_heap_ranges != 0) {
1012 assert(open_archive_heap_ranges != NULL, "NULL open_archive_heap_ranges array with non-zero count");
1013 G1CollectedHeap::heap()->fill_archive_regions(open_archive_heap_ranges,
1014 num_open_archive_heap_ranges);
1015 }
1016 }
1017
1018 // dealloc the archive regions from java heap
1019 void FileMapInfo::dealloc_archive_heap_regions(MemRegion* regions, int num) {
1020 if (num > 0) {
1021 assert(regions != NULL, "Null archive ranges array with non-zero count");
1022 G1CollectedHeap::heap()->dealloc_archive_regions(regions, num);
1023 }
1024 }
1025 #endif // INCLUDE_CDS_JAVA_HEAP
1026
1027 bool FileMapInfo::verify_region_checksum(int i) {
1028 if (!VerifySharedSpaces) {
1029 return true;
1030 }
1031
1032 size_t sz = space_at(i)->_used;
1033
1034 if (sz == 0) {
1035 return true; // no data
1036 }
1037 if ((MetaspaceShared::is_string_region(i) &&
1038 !StringTable::shared_string_mapped()) ||
1039 (MetaspaceShared::is_open_archive_heap_region(i) &&
1040 !MetaspaceShared::open_archive_heap_region_mapped())) {
1041 return true; // archived heap data is not mapped
1042 }
1043 const char* buf = _header->region_addr(i);
1044 int crc = ClassLoader::crc32(0, buf, (jint)sz);
1045 if (crc != space_at(i)->_crc) {
1046 fail_continue("Checksum verification failed.");
1047 return false;
1048 }
1049 return true;
1050 }
1051
1052 // Unmap a memory region in the address space.
1053
1054 void FileMapInfo::unmap_region(int i) {
1055 assert(!MetaspaceShared::is_heap_region(i), "sanity");
1056 CDSFileMapRegion* si = space_at(i);
1057 size_t used = si->_used;
1058 size_t size = align_up(used, os::vm_allocation_granularity());
1059
1060 if (used == 0) {
1061 return;
1062 }
1063
1064 char* addr = _header->region_addr(i);
1065 if (!os::unmap_memory(addr, size)) {
1066 fail_stop("Unable to unmap shared space.");
1067 }
1068 }
1069
1070 void FileMapInfo::assert_mark(bool check) {
1071 if (!check) {
1072 fail_stop("Mark mismatch while restoring from shared file.");
1073 }
1074 }
1075
1076 void FileMapInfo::metaspace_pointers_do(MetaspaceClosure* it) {
1077 it->push(&_shared_path_table);
1078 for (int i=0; i<_shared_path_table_size; i++) {
1079 shared_path(i)->metaspace_pointers_do(it);
1080 }
1081 }
1082
1083
1084 FileMapInfo* FileMapInfo::_current_info = NULL;
1085 Array<u8>* FileMapInfo::_shared_path_table = NULL;
1086 int FileMapInfo::_shared_path_table_size = 0;
1087 size_t FileMapInfo::_shared_path_entry_size = 0x1234baad;
1088 bool FileMapInfo::_validating_shared_path_table = false;
1089
1090 // Open the shared archive file, read and validate the header
1091 // information (version, boot classpath, etc.). If initialization
1092 // fails, shared spaces are disabled and the file is closed. [See
1093 // fail_continue.]
1094 //
1095 // Validation of the archive is done in two steps:
1096 //
1097 // [1] validate_header() - done here. This checks the header, including _paths_misc_info.
1098 // [2] validate_shared_path_table - this is done later, because the table is in the RW
1099 // region of the archive, which is not mapped yet.
1100 bool FileMapInfo::initialize() {
1101 assert(UseSharedSpaces, "UseSharedSpaces expected.");
1102
1103 if (!open_for_read()) {
1104 return false;
1105 }
1106
1107 init_from_file(_fd);
1108 if (!validate_header()) {
1109 return false;
1110 }
1111 return true;
1112 }
1113
1114 char* FileMapHeader::region_addr(int idx) {
1115 if (MetaspaceShared::is_heap_region(idx)) {
1116 return _space[idx]._used > 0 ?
1117 (char*)((void*)CompressedOops::decode_not_null((narrowOop)_space[idx]._addr._offset)) : NULL;
1118 } else {
1119 return _space[idx]._addr._base;
1120 }
1121 }
1122
1123 int FileMapHeader::compute_crc() {
1124 char* start = (char*)this;
1125 // start computing from the field after _crc
1126 char* buf = (char*)&_crc + sizeof(_crc);
1127 size_t sz = sizeof(FileMapHeader) - (buf - start);
1128 int crc = ClassLoader::crc32(0, buf, (jint)sz);
1129 return crc;
1130 }
1131
1132 // This function should only be called during run time with UseSharedSpaces enabled.
1133 bool FileMapHeader::validate() {
1134 if (VerifySharedSpaces && compute_crc() != _crc) {
1135 FileMapInfo::fail_continue("Header checksum verification failed.");
1136 return false;
1137 }
1138
1139 if (!Arguments::has_jimage()) {
1140 FileMapInfo::fail_continue("The shared archive file cannot be used with an exploded module build.");
1141 return false;
1142 }
1143
1144 if (_version != CURRENT_CDS_ARCHIVE_VERSION) {
1145 FileMapInfo::fail_continue("The shared archive file is the wrong version.");
1146 return false;
1147 }
1148 if (_magic != CDS_ARCHIVE_MAGIC) {
1149 FileMapInfo::fail_continue("The shared archive file has a bad magic number.");
1150 return false;
1151 }
1152 char header_version[JVM_IDENT_MAX];
1153 get_header_version(header_version);
1154 if (strncmp(_jvm_ident, header_version, JVM_IDENT_MAX-1) != 0) {
1155 log_info(class, path)("expected: %s", header_version);
1156 log_info(class, path)("actual: %s", _jvm_ident);
1157 FileMapInfo::fail_continue("The shared archive file was created by a different"
1158 " version or build of HotSpot");
1159 return false;
1160 }
1161 if (_obj_alignment != ObjectAlignmentInBytes) {
1162 FileMapInfo::fail_continue("The shared archive file's ObjectAlignmentInBytes of %d"
1163 " does not equal the current ObjectAlignmentInBytes of " INTX_FORMAT ".",
1164 _obj_alignment, ObjectAlignmentInBytes);
1165 return false;
1166 }
1167 if (_compact_strings != CompactStrings) {
1168 FileMapInfo::fail_continue("The shared archive file's CompactStrings setting (%s)"
1169 " does not equal the current CompactStrings setting (%s).",
1170 _compact_strings ? "enabled" : "disabled",
1171 CompactStrings ? "enabled" : "disabled");
1172 return false;
1173 }
1174
1175 // This must be done after header validation because it might change the
1176 // header data
1177 const char* prop = Arguments::get_property("java.system.class.loader");
1178 if (prop != NULL) {
1179 warning("Archived non-system classes are disabled because the "
1180 "java.system.class.loader property is specified (value = \"%s\"). "
1181 "To use archived non-system classes, this property must be not be set", prop);
1182 _has_platform_or_app_classes = false;
1183 }
1184
1185 // For backwards compatibility, we don't check the verification setting
1186 // if the archive only contains system classes.
1187 if (_has_platform_or_app_classes &&
1188 ((!_verify_local && BytecodeVerificationLocal) ||
1189 (!_verify_remote && BytecodeVerificationRemote))) {
1190 FileMapInfo::fail_continue("The shared archive file was created with less restrictive "
1191 "verification setting than the current setting.");
1192 return false;
1193 }
1194
1195 return true;
1196 }
1197
1198 bool FileMapInfo::validate_header() {
1199 bool status = _header->validate();
1200
1201 if (status) {
1202 if (!ClassLoader::check_shared_paths_misc_info(_paths_misc_info, _header->_paths_misc_info_size)) {
1203 if (!PrintSharedArchiveAndExit) {
1204 fail_continue("shared class paths mismatch (hint: enable -Xlog:class+path=info to diagnose the failure)");
1205 status = false;
1206 }
1207 }
1208 }
1209
1210 if (_paths_misc_info != NULL) {
1211 FREE_C_HEAP_ARRAY(char, _paths_misc_info);
1212 _paths_misc_info = NULL;
1213 }
1214 return status;
1215 }
1216
1217 // Check if a given address is within one of the shared regions
1218 bool FileMapInfo::is_in_shared_region(const void* p, int idx) {
1219 assert(idx == MetaspaceShared::ro ||
1220 idx == MetaspaceShared::rw ||
1221 idx == MetaspaceShared::mc ||
1222 idx == MetaspaceShared::md, "invalid region index");
1223 char* base = _header->region_addr(idx);
1224 if (p >= base && p < base + space_at(idx)->_used) {
1225 return true;
1226 }
1227 return false;
1228 }
1229
1230 void FileMapInfo::print_shared_spaces() {
1231 tty->print_cr("Shared Spaces:");
1232 for (int i = 0; i < MetaspaceShared::n_regions; i++) {
1233 CDSFileMapRegion* si = space_at(i);
1234 char *base = _header->region_addr(i);
1235 tty->print(" %s " INTPTR_FORMAT "-" INTPTR_FORMAT,
1236 shared_region_name[i],
1237 p2i(base), p2i(base + si->_used));
1238 }
1239 }
1240
1241 // Unmap mapped regions of shared space.
1242 void FileMapInfo::stop_sharing_and_unmap(const char* msg) {
1243 FileMapInfo *map_info = FileMapInfo::current_info();
1244 if (map_info) {
1245 map_info->fail_continue("%s", msg);
1246 for (int i = 0; i < MetaspaceShared::num_non_heap_spaces; i++) {
1247 char *addr = map_info->_header->region_addr(i);
1248 if (addr != NULL && !MetaspaceShared::is_heap_region(i)) {
1249 map_info->unmap_region(i);
1250 map_info->space_at(i)->_addr._base = NULL;
1251 }
1252 }
1253 // Dealloc the archive heap regions only without unmapping. The regions are part
1254 // of the java heap. Unmapping of the heap regions are managed by GC.
1255 map_info->dealloc_archive_heap_regions(open_archive_heap_ranges,
1256 num_open_archive_heap_ranges);
1257 map_info->dealloc_archive_heap_regions(string_ranges, num_string_ranges);
1258 } else if (DumpSharedSpaces) {
1259 fail_stop("%s", msg);
1260 }
1261 }