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