1 /*
2 * Copyright (c) 2003, 2025, 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 "cds/aotClassLocation.hpp"
26 #include "cds/archiveBuilder.hpp"
27 #include "cds/archiveHeapLoader.inline.hpp"
28 #include "cds/archiveHeapWriter.hpp"
29 #include "cds/archiveUtils.inline.hpp"
30 #include "cds/cds_globals.hpp"
31 #include "cds/cdsConfig.hpp"
32 #include "cds/dynamicArchive.hpp"
33 #include "cds/filemap.hpp"
34 #include "cds/heapShared.hpp"
35 #include "cds/metaspaceShared.hpp"
36 #include "classfile/altHashing.hpp"
37 #include "classfile/classFileStream.hpp"
38 #include "classfile/classLoader.hpp"
39 #include "classfile/classLoader.inline.hpp"
40 #include "classfile/classLoaderData.inline.hpp"
41 #include "classfile/classLoaderExt.hpp"
42 #include "classfile/symbolTable.hpp"
43 #include "classfile/systemDictionaryShared.hpp"
44 #include "classfile/vmClasses.hpp"
45 #include "classfile/vmSymbols.hpp"
46 #include "jvm.h"
47 #include "logging/log.hpp"
48 #include "logging/logMessage.hpp"
49 #include "logging/logStream.hpp"
50 #include "memory/iterator.inline.hpp"
51 #include "memory/metadataFactory.hpp"
52 #include "memory/metaspaceClosure.hpp"
53 #include "memory/oopFactory.hpp"
54 #include "memory/universe.hpp"
55 #include "nmt/memTracker.hpp"
56 #include "oops/access.hpp"
57 #include "oops/compressedOops.hpp"
58 #include "oops/compressedOops.inline.hpp"
59 #include "oops/compressedKlass.hpp"
60 #include "oops/objArrayOop.hpp"
61 #include "oops/oop.inline.hpp"
62 #include "oops/typeArrayKlass.hpp"
63 #include "prims/jvmtiExport.hpp"
64 #include "runtime/arguments.hpp"
65 #include "runtime/globals_extension.hpp"
66 #include "runtime/java.hpp"
67 #include "runtime/javaCalls.hpp"
68 #include "runtime/mutexLocker.hpp"
69 #include "runtime/os.hpp"
70 #include "runtime/vm_version.hpp"
71 #include "utilities/align.hpp"
72 #include "utilities/bitMap.inline.hpp"
73 #include "utilities/classpathStream.hpp"
74 #include "utilities/defaultStream.hpp"
75 #include "utilities/ostream.hpp"
76 #if INCLUDE_G1GC
77 #include "gc/g1/g1CollectedHeap.hpp"
78 #include "gc/g1/g1HeapRegion.hpp"
79 #endif
80
81 # include <sys/stat.h>
82 # include <errno.h>
83
84 #ifndef O_BINARY // if defined (Win32) use binary files.
85 #define O_BINARY 0 // otherwise do nothing.
86 #endif
87
88 // Fill in the fileMapInfo structure with data about this VM instance.
89
90 // This method copies the vm version info into header_version. If the version is too
91 // long then a truncated version, which has a hash code appended to it, is copied.
92 //
93 // Using a template enables this method to verify that header_version is an array of
94 // length JVM_IDENT_MAX. This ensures that the code that writes to the CDS file and
95 // the code that reads the CDS file will both use the same size buffer. Hence, will
96 // use identical truncation. This is necessary for matching of truncated versions.
97 template <int N> static void get_header_version(char (&header_version) [N]) {
98 assert(N == JVM_IDENT_MAX, "Bad header_version size");
99
100 const char *vm_version = VM_Version::internal_vm_info_string();
101 const int version_len = (int)strlen(vm_version);
102
103 memset(header_version, 0, JVM_IDENT_MAX);
104
105 if (version_len < (JVM_IDENT_MAX-1)) {
106 strcpy(header_version, vm_version);
107
108 } else {
109 // Get the hash value. Use a static seed because the hash needs to return the same
110 // value over multiple jvm invocations.
111 uint32_t hash = AltHashing::halfsiphash_32(8191, (const uint8_t*)vm_version, version_len);
112
113 // Truncate the ident, saving room for the 8 hex character hash value.
114 strncpy(header_version, vm_version, JVM_IDENT_MAX-9);
115
116 // Append the hash code as eight hex digits.
117 os::snprintf_checked(&header_version[JVM_IDENT_MAX-9], 9, "%08x", hash);
118 header_version[JVM_IDENT_MAX-1] = 0; // Null terminate.
119 }
120
121 assert(header_version[JVM_IDENT_MAX-1] == 0, "must be");
122 }
123
124 FileMapInfo::FileMapInfo(const char* full_path, bool is_static) :
125 _is_static(is_static), _file_open(false), _is_mapped(false), _fd(-1), _file_offset(0),
126 _full_path(full_path), _base_archive_name(nullptr), _header(nullptr) {
127 if (_is_static) {
128 assert(_current_info == nullptr, "must be singleton"); // not thread safe
129 _current_info = this;
130 } else {
131 assert(_dynamic_archive_info == nullptr, "must be singleton"); // not thread safe
132 _dynamic_archive_info = this;
133 }
134 }
135
136 FileMapInfo::~FileMapInfo() {
137 if (_is_static) {
138 assert(_current_info == this, "must be singleton"); // not thread safe
139 _current_info = nullptr;
140 } else {
141 assert(_dynamic_archive_info == this, "must be singleton"); // not thread safe
142 _dynamic_archive_info = nullptr;
143 }
144
145 if (_header != nullptr) {
146 os::free(_header);
147 }
148
149 if (_file_open) {
150 ::close(_fd);
151 }
152 }
153
154 void FileMapInfo::free_current_info() {
155 assert(CDSConfig::is_dumping_final_static_archive(), "only supported in this mode");
156 assert(_current_info != nullptr, "sanity");
157 delete _current_info;
158 assert(_current_info == nullptr, "sanity"); // Side effect expected from the above "delete" operator.
159 }
160
161 void FileMapInfo::populate_header(size_t core_region_alignment) {
162 assert(_header == nullptr, "Sanity check");
163 size_t c_header_size;
164 size_t header_size;
165 size_t base_archive_name_size = 0;
166 size_t base_archive_name_offset = 0;
167 if (is_static()) {
168 c_header_size = sizeof(FileMapHeader);
169 header_size = c_header_size;
170 } else {
171 // dynamic header including base archive name for non-default base archive
172 c_header_size = sizeof(DynamicArchiveHeader);
173 header_size = c_header_size;
174
175 const char* default_base_archive_name = CDSConfig::default_archive_path();
176 const char* current_base_archive_name = CDSConfig::static_archive_path();
177 if (!os::same_files(current_base_archive_name, default_base_archive_name)) {
178 base_archive_name_size = strlen(current_base_archive_name) + 1;
179 header_size += base_archive_name_size;
180 base_archive_name_offset = c_header_size;
181 }
182 }
183 _header = (FileMapHeader*)os::malloc(header_size, mtInternal);
184 memset((void*)_header, 0, header_size);
185 _header->populate(this,
186 core_region_alignment,
187 header_size,
188 base_archive_name_size,
189 base_archive_name_offset);
190 }
191
192 void FileMapHeader::populate(FileMapInfo *info, size_t core_region_alignment,
193 size_t header_size, size_t base_archive_name_size,
194 size_t base_archive_name_offset) {
195 // 1. We require _generic_header._magic to be at the beginning of the file
196 // 2. FileMapHeader also assumes that _generic_header is at the beginning of the file
197 assert(offset_of(FileMapHeader, _generic_header) == 0, "must be");
198 set_header_size((unsigned int)header_size);
199 set_base_archive_name_offset((unsigned int)base_archive_name_offset);
200 set_base_archive_name_size((unsigned int)base_archive_name_size);
201 if (CDSConfig::is_dumping_dynamic_archive()) {
202 set_magic(CDS_DYNAMIC_ARCHIVE_MAGIC);
203 } else if (CDSConfig::is_dumping_preimage_static_archive()) {
204 set_magic(CDS_PREIMAGE_ARCHIVE_MAGIC);
205 } else {
206 set_magic(CDS_ARCHIVE_MAGIC);
207 }
208 set_version(CURRENT_CDS_ARCHIVE_VERSION);
209
210 if (!info->is_static() && base_archive_name_size != 0) {
211 // copy base archive name
212 copy_base_archive_name(CDSConfig::static_archive_path());
213 }
214 _core_region_alignment = core_region_alignment;
215 _obj_alignment = ObjectAlignmentInBytes;
216 _compact_strings = CompactStrings;
217 _compact_headers = UseCompactObjectHeaders;
218 if (CDSConfig::is_dumping_heap()) {
219 _narrow_oop_mode = CompressedOops::mode();
220 _narrow_oop_base = CompressedOops::base();
221 _narrow_oop_shift = CompressedOops::shift();
222 }
223 _compressed_oops = UseCompressedOops;
224 _compressed_class_ptrs = UseCompressedClassPointers;
225 if (UseCompressedClassPointers) {
226 #ifdef _LP64
227 _narrow_klass_pointer_bits = CompressedKlassPointers::narrow_klass_pointer_bits();
228 _narrow_klass_shift = ArchiveBuilder::precomputed_narrow_klass_shift();
229 #endif
230 } else {
231 _narrow_klass_pointer_bits = _narrow_klass_shift = -1;
232 }
233 _max_heap_size = MaxHeapSize;
234 _use_optimized_module_handling = CDSConfig::is_using_optimized_module_handling();
235 _has_aot_linked_classes = CDSConfig::is_dumping_aot_linked_classes();
236 _has_full_module_graph = CDSConfig::is_dumping_full_module_graph();
237
238 // The following fields are for sanity checks for whether this archive
239 // will function correctly with this JVM and the bootclasspath it's
240 // invoked with.
241
242 // JVM version string ... changes on each build.
243 get_header_version(_jvm_ident);
244
245 _verify_local = BytecodeVerificationLocal;
246 _verify_remote = BytecodeVerificationRemote;
247 _has_platform_or_app_classes = AOTClassLocationConfig::dumptime()->has_platform_or_app_classes();
248 _requested_base_address = (char*)SharedBaseAddress;
249 _mapped_base_address = (char*)SharedBaseAddress;
250 _allow_archiving_with_java_agent = AllowArchivingWithJavaAgent;
251 }
252
253 void FileMapHeader::copy_base_archive_name(const char* archive) {
254 assert(base_archive_name_size() != 0, "_base_archive_name_size not set");
255 assert(base_archive_name_offset() != 0, "_base_archive_name_offset not set");
256 assert(header_size() > sizeof(*this), "_base_archive_name_size not included in header size?");
257 memcpy((char*)this + base_archive_name_offset(), archive, base_archive_name_size());
258 }
259
260 void FileMapHeader::print(outputStream* st) {
261 ResourceMark rm;
262
263 st->print_cr("- magic: 0x%08x", magic());
264 st->print_cr("- crc: 0x%08x", crc());
265 st->print_cr("- version: 0x%x", version());
266 st->print_cr("- header_size: " UINT32_FORMAT, header_size());
267 st->print_cr("- base_archive_name_offset: " UINT32_FORMAT, base_archive_name_offset());
268 st->print_cr("- base_archive_name_size: " UINT32_FORMAT, base_archive_name_size());
269
270 for (int i = 0; i < NUM_CDS_REGIONS; i++) {
271 FileMapRegion* r = region_at(i);
272 r->print(st, i);
273 }
274 st->print_cr("============ end regions ======== ");
275
276 st->print_cr("- core_region_alignment: %zu", _core_region_alignment);
277 st->print_cr("- obj_alignment: %d", _obj_alignment);
278 st->print_cr("- narrow_oop_base: " INTPTR_FORMAT, p2i(_narrow_oop_base));
279 st->print_cr("- narrow_oop_shift %d", _narrow_oop_shift);
280 st->print_cr("- compact_strings: %d", _compact_strings);
281 st->print_cr("- compact_headers: %d", _compact_headers);
282 st->print_cr("- max_heap_size: %zu", _max_heap_size);
283 st->print_cr("- narrow_oop_mode: %d", _narrow_oop_mode);
284 st->print_cr("- compressed_oops: %d", _compressed_oops);
285 st->print_cr("- compressed_class_ptrs: %d", _compressed_class_ptrs);
286 st->print_cr("- narrow_klass_pointer_bits: %d", _narrow_klass_pointer_bits);
287 st->print_cr("- narrow_klass_shift: %d", _narrow_klass_shift);
288 st->print_cr("- cloned_vtables_offset: 0x%zx", _cloned_vtables_offset);
289 st->print_cr("- early_serialized_data_offset: 0x%zx", _early_serialized_data_offset);
290 st->print_cr("- serialized_data_offset: 0x%zx", _serialized_data_offset);
291 st->print_cr("- jvm_ident: %s", _jvm_ident);
292 st->print_cr("- class_location_config_offset: 0x%zx", _class_location_config_offset);
293 st->print_cr("- verify_local: %d", _verify_local);
294 st->print_cr("- verify_remote: %d", _verify_remote);
295 st->print_cr("- has_platform_or_app_classes: %d", _has_platform_or_app_classes);
296 st->print_cr("- requested_base_address: " INTPTR_FORMAT, p2i(_requested_base_address));
297 st->print_cr("- mapped_base_address: " INTPTR_FORMAT, p2i(_mapped_base_address));
298 st->print_cr("- heap_root_segments.roots_count: %d" , _heap_root_segments.roots_count());
299 st->print_cr("- heap_root_segments.base_offset: 0x%zx", _heap_root_segments.base_offset());
300 st->print_cr("- heap_root_segments.count: %zu", _heap_root_segments.count());
301 st->print_cr("- heap_root_segments.max_size_elems: %d", _heap_root_segments.max_size_in_elems());
302 st->print_cr("- heap_root_segments.max_size_bytes: %d", _heap_root_segments.max_size_in_bytes());
303 st->print_cr("- _heap_oopmap_start_pos: %zu", _heap_oopmap_start_pos);
304 st->print_cr("- _heap_ptrmap_start_pos: %zu", _heap_ptrmap_start_pos);
305 st->print_cr("- _rw_ptrmap_start_pos: %zu", _rw_ptrmap_start_pos);
306 st->print_cr("- _ro_ptrmap_start_pos: %zu", _ro_ptrmap_start_pos);
307 st->print_cr("- allow_archiving_with_java_agent:%d", _allow_archiving_with_java_agent);
308 st->print_cr("- use_optimized_module_handling: %d", _use_optimized_module_handling);
309 st->print_cr("- has_full_module_graph %d", _has_full_module_graph);
310 st->print_cr("- has_aot_linked_classes %d", _has_aot_linked_classes);
311 }
312
313 bool FileMapInfo::validate_class_location() {
314 assert(CDSConfig::is_using_archive(), "runtime only");
315
316 AOTClassLocationConfig* config = header()->class_location_config();
317 bool has_extra_module_paths = false;
318 if (!config->validate(header()->has_aot_linked_classes(), &has_extra_module_paths)) {
319 if (PrintSharedArchiveAndExit) {
320 MetaspaceShared::set_archive_loading_failed();
321 return true;
322 } else {
323 return false;
324 }
325 }
326
327 if (header()->has_full_module_graph() && has_extra_module_paths) {
328 CDSConfig::stop_using_optimized_module_handling();
329 log_info(cds)("optimized module handling: disabled because extra module path(s) are specified");
330 }
331
332 if (CDSConfig::is_dumping_dynamic_archive()) {
333 // Only support dynamic dumping with the usage of the default CDS archive
334 // or a simple base archive.
335 // If the base layer archive contains additional path component besides
336 // the runtime image and the -cp, dynamic dumping is disabled.
337 if (config->num_boot_classpaths() > 0) {
338 CDSConfig::disable_dumping_dynamic_archive();
339 log_warning(cds)(
340 "Dynamic archiving is disabled because base layer archive has appended boot classpath");
341 }
342 if (config->num_module_paths() > 0) {
343 if (has_extra_module_paths) {
344 CDSConfig::disable_dumping_dynamic_archive();
345 log_warning(cds)(
346 "Dynamic archiving is disabled because base layer archive has a different module path");
347 }
348 }
349 }
350
351 #if INCLUDE_JVMTI
352 if (_classpath_entries_for_jvmti != nullptr) {
353 os::free(_classpath_entries_for_jvmti);
354 }
355 size_t sz = sizeof(ClassPathEntry*) * AOTClassLocationConfig::runtime()->length();
356 _classpath_entries_for_jvmti = (ClassPathEntry**)os::malloc(sz, mtClass);
357 memset((void*)_classpath_entries_for_jvmti, 0, sz);
358 #endif
359
360 return true;
361 }
362
363 // A utility class for reading/validating the GenericCDSFileMapHeader portion of
364 // a CDS archive's header. The file header of all CDS archives with versions from
365 // CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION (12) are guaranteed to always start
366 // with GenericCDSFileMapHeader. This makes it possible to read important information
367 // from a CDS archive created by a different version of HotSpot, so that we can
368 // automatically regenerate the archive as necessary (JDK-8261455).
369 class FileHeaderHelper {
370 int _fd;
371 bool _is_valid;
372 bool _is_static;
373 GenericCDSFileMapHeader* _header;
374 const char* _archive_name;
375 const char* _base_archive_name;
376
377 public:
378 FileHeaderHelper(const char* archive_name, bool is_static) {
379 _fd = -1;
380 _is_valid = false;
381 _header = nullptr;
382 _base_archive_name = nullptr;
383 _archive_name = archive_name;
384 _is_static = is_static;
385 }
386
387 ~FileHeaderHelper() {
388 if (_header != nullptr) {
389 FREE_C_HEAP_ARRAY(char, _header);
390 }
391 if (_fd != -1) {
392 ::close(_fd);
393 }
394 }
395
396 bool initialize() {
397 assert(_archive_name != nullptr, "Archive name is null");
398 _fd = os::open(_archive_name, O_RDONLY | O_BINARY, 0);
399 if (_fd < 0) {
400 log_info(cds)("Specified %s not found (%s)", CDSConfig::type_of_archive_being_loaded(), _archive_name);
401 return false;
402 }
403 return initialize(_fd);
404 }
405
406 // for an already opened file, do not set _fd
407 bool initialize(int fd) {
408 assert(_archive_name != nullptr, "Archive name is null");
409 assert(fd != -1, "Archive must be opened already");
410 // First read the generic header so we know the exact size of the actual header.
411 const char* file_type = CDSConfig::type_of_archive_being_loaded();
412 GenericCDSFileMapHeader gen_header;
413 size_t size = sizeof(GenericCDSFileMapHeader);
414 os::lseek(fd, 0, SEEK_SET);
415 size_t n = ::read(fd, (void*)&gen_header, (unsigned int)size);
416 if (n != size) {
417 log_warning(cds)("Unable to read generic CDS file map header from %s", file_type);
418 return false;
419 }
420
421 if (gen_header._magic != CDS_ARCHIVE_MAGIC &&
422 gen_header._magic != CDS_DYNAMIC_ARCHIVE_MAGIC &&
423 gen_header._magic != CDS_PREIMAGE_ARCHIVE_MAGIC) {
424 log_warning(cds)("The %s has a bad magic number: %#x", file_type, gen_header._magic);
425 return false;
426 }
427
428 if (gen_header._version < CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION) {
429 log_warning(cds)("Cannot handle %s version 0x%x. Must be at least 0x%x.",
430 file_type, gen_header._version, CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION);
431 return false;
432 }
433
434 if (gen_header._version != CURRENT_CDS_ARCHIVE_VERSION) {
435 log_warning(cds)("The %s version 0x%x does not match the required version 0x%x.",
436 file_type, gen_header._version, CURRENT_CDS_ARCHIVE_VERSION);
437 }
438
439 size_t filelen = os::lseek(fd, 0, SEEK_END);
440 if (gen_header._header_size >= filelen) {
441 log_warning(cds)("Archive file header larger than archive file");
442 return false;
443 }
444
445 // Read the actual header and perform more checks
446 size = gen_header._header_size;
447 _header = (GenericCDSFileMapHeader*)NEW_C_HEAP_ARRAY(char, size, mtInternal);
448 os::lseek(fd, 0, SEEK_SET);
449 n = ::read(fd, (void*)_header, (unsigned int)size);
450 if (n != size) {
451 log_warning(cds)("Unable to read file map header from %s", file_type);
452 return false;
453 }
454
455 if (!check_header_crc()) {
456 return false;
457 }
458
459 if (!check_and_init_base_archive_name()) {
460 return false;
461 }
462
463 // All fields in the GenericCDSFileMapHeader has been validated.
464 _is_valid = true;
465 return true;
466 }
467
468 GenericCDSFileMapHeader* get_generic_file_header() {
469 assert(_header != nullptr && _is_valid, "must be a valid archive file");
470 return _header;
471 }
472
473 const char* base_archive_name() {
474 assert(_header != nullptr && _is_valid, "must be a valid archive file");
475 return _base_archive_name;
476 }
477
478 bool is_static_archive() const {
479 return _header->_magic == CDS_ARCHIVE_MAGIC;
480 }
481
482 bool is_dynamic_archive() const {
483 return _header->_magic == CDS_DYNAMIC_ARCHIVE_MAGIC;
484 }
485
486 bool is_preimage_static_archive() const {
487 return _header->_magic == CDS_PREIMAGE_ARCHIVE_MAGIC;
488 }
489
490 private:
491 bool check_header_crc() const {
492 if (VerifySharedSpaces) {
493 FileMapHeader* header = (FileMapHeader*)_header;
494 int actual_crc = header->compute_crc();
495 if (actual_crc != header->crc()) {
496 log_info(cds)("_crc expected: %d", header->crc());
497 log_info(cds)(" actual: %d", actual_crc);
498 log_warning(cds)("Header checksum verification failed.");
499 return false;
500 }
501 }
502 return true;
503 }
504
505 bool check_and_init_base_archive_name() {
506 unsigned int name_offset = _header->_base_archive_name_offset;
507 unsigned int name_size = _header->_base_archive_name_size;
508 unsigned int header_size = _header->_header_size;
509
510 if (name_offset + name_size < name_offset) {
511 log_warning(cds)("base_archive_name offset/size overflow: " UINT32_FORMAT "/" UINT32_FORMAT,
512 name_offset, name_size);
513 return false;
514 }
515
516 if (is_static_archive() || is_preimage_static_archive()) {
517 if (name_offset != 0) {
518 log_warning(cds)("static shared archive must have zero _base_archive_name_offset");
519 return false;
520 }
521 if (name_size != 0) {
522 log_warning(cds)("static shared archive must have zero _base_archive_name_size");
523 return false;
524 }
525 } else {
526 assert(is_dynamic_archive(), "must be");
527 if ((name_size == 0 && name_offset != 0) ||
528 (name_size != 0 && name_offset == 0)) {
529 // If either is zero, both must be zero. This indicates that we are using the default base archive.
530 log_warning(cds)("Invalid base_archive_name offset/size: " UINT32_FORMAT "/" UINT32_FORMAT,
531 name_offset, name_size);
532 return false;
533 }
534 if (name_size > 0) {
535 if (name_offset + name_size > header_size) {
536 log_warning(cds)("Invalid base_archive_name offset/size (out of range): "
537 UINT32_FORMAT " + " UINT32_FORMAT " > " UINT32_FORMAT ,
538 name_offset, name_size, header_size);
539 return false;
540 }
541 const char* name = ((const char*)_header) + _header->_base_archive_name_offset;
542 if (name[name_size - 1] != '\0' || strlen(name) != name_size - 1) {
543 log_warning(cds)("Base archive name is damaged");
544 return false;
545 }
546 if (!os::file_exists(name)) {
547 log_warning(cds)("Base archive %s does not exist", name);
548 return false;
549 }
550 _base_archive_name = name;
551 }
552 }
553
554 return true;
555 }
556 };
557
558 // Return value:
559 // false:
560 // <archive_name> is not a valid archive. *base_archive_name is set to null.
561 // true && (*base_archive_name) == nullptr:
562 // <archive_name> is a valid static archive.
563 // true && (*base_archive_name) != nullptr:
564 // <archive_name> is a valid dynamic archive.
565 bool FileMapInfo::get_base_archive_name_from_header(const char* archive_name,
566 char** base_archive_name) {
567 FileHeaderHelper file_helper(archive_name, false);
568 *base_archive_name = nullptr;
569
570 if (!file_helper.initialize()) {
571 return false;
572 }
573 GenericCDSFileMapHeader* header = file_helper.get_generic_file_header();
574 switch (header->_magic) {
575 case CDS_PREIMAGE_ARCHIVE_MAGIC:
576 return false; // This is a binary config file, not a proper archive
577 case CDS_DYNAMIC_ARCHIVE_MAGIC:
578 break;
579 default:
580 assert(header->_magic == CDS_ARCHIVE_MAGIC, "must be");
581 if (AutoCreateSharedArchive) {
582 log_warning(cds)("AutoCreateSharedArchive is ignored because %s is a static archive", archive_name);
583 }
584 return true;
585 }
586
587 const char* base = file_helper.base_archive_name();
588 if (base == nullptr) {
589 *base_archive_name = CDSConfig::default_archive_path();
590 } else {
591 *base_archive_name = os::strdup_check_oom(base);
592 }
593
594 return true;
595 }
596
597 bool FileMapInfo::is_preimage_static_archive(const char* file) {
598 FileHeaderHelper file_helper(file, false);
599 if (!file_helper.initialize()) {
600 return false;
601 }
602 return file_helper.is_preimage_static_archive();
603 }
604
605 // Read the FileMapInfo information from the file.
606
607 bool FileMapInfo::init_from_file(int fd) {
608 FileHeaderHelper file_helper(_full_path, _is_static);
609 if (!file_helper.initialize(fd)) {
610 log_warning(cds)("Unable to read the file header.");
611 return false;
612 }
613 GenericCDSFileMapHeader* gen_header = file_helper.get_generic_file_header();
614
615 const char* file_type = CDSConfig::type_of_archive_being_loaded();
616 if (_is_static) {
617 if ((gen_header->_magic == CDS_ARCHIVE_MAGIC) ||
618 (gen_header->_magic == CDS_PREIMAGE_ARCHIVE_MAGIC && CDSConfig::is_dumping_final_static_archive())) {
619 // Good
620 } else {
621 if (CDSConfig::new_aot_flags_used()) {
622 log_warning(cds)("Not a valid %s %s", file_type, _full_path);
623 } else {
624 log_warning(cds)("Not a base shared archive: %s", _full_path);
625 }
626 return false;
627 }
628 } else {
629 if (gen_header->_magic != CDS_DYNAMIC_ARCHIVE_MAGIC) {
630 log_warning(cds)("Not a top shared archive: %s", _full_path);
631 return false;
632 }
633 }
634
635 _header = (FileMapHeader*)os::malloc(gen_header->_header_size, mtInternal);
636 os::lseek(fd, 0, SEEK_SET); // reset to begin of the archive
637 size_t size = gen_header->_header_size;
638 size_t n = ::read(fd, (void*)_header, (unsigned int)size);
639 if (n != size) {
640 log_warning(cds)("Failed to read file header from the top archive file\n");
641 return false;
642 }
643
644 if (header()->version() != CURRENT_CDS_ARCHIVE_VERSION) {
645 log_info(cds)("_version expected: 0x%x", CURRENT_CDS_ARCHIVE_VERSION);
646 log_info(cds)(" actual: 0x%x", header()->version());
647 log_warning(cds)("The %s has the wrong version.", file_type);
648 return false;
649 }
650
651 unsigned int base_offset = header()->base_archive_name_offset();
652 unsigned int name_size = header()->base_archive_name_size();
653 unsigned int header_size = header()->header_size();
654 if (base_offset != 0 && name_size != 0) {
655 if (header_size != base_offset + name_size) {
656 log_info(cds)("_header_size: " UINT32_FORMAT, header_size);
657 log_info(cds)("base_archive_name_size: " UINT32_FORMAT, header()->base_archive_name_size());
658 log_info(cds)("base_archive_name_offset: " UINT32_FORMAT, header()->base_archive_name_offset());
659 log_warning(cds)("The %s has an incorrect header size.", file_type);
660 return false;
661 }
662 }
663
664 const char* actual_ident = header()->jvm_ident();
665
666 if (actual_ident[JVM_IDENT_MAX-1] != 0) {
667 log_warning(cds)("JVM version identifier is corrupted.");
668 return false;
669 }
670
671 char expected_ident[JVM_IDENT_MAX];
672 get_header_version(expected_ident);
673 if (strncmp(actual_ident, expected_ident, JVM_IDENT_MAX-1) != 0) {
674 log_info(cds)("_jvm_ident expected: %s", expected_ident);
675 log_info(cds)(" actual: %s", actual_ident);
676 log_warning(cds)("The %s was created by a different"
677 " version or build of HotSpot", file_type);
678 return false;
679 }
680
681 _file_offset = header()->header_size(); // accounts for the size of _base_archive_name
682
683 size_t len = os::lseek(fd, 0, SEEK_END);
684
685 for (int i = 0; i < MetaspaceShared::n_regions; i++) {
686 FileMapRegion* r = region_at(i);
687 if (r->file_offset() > len || len - r->file_offset() < r->used()) {
688 log_warning(cds)("The %s has been truncated.", file_type);
689 return false;
690 }
691 }
692
693 return true;
694 }
695
696 void FileMapInfo::seek_to_position(size_t pos) {
697 if (os::lseek(_fd, (long)pos, SEEK_SET) < 0) {
698 log_error(cds)("Unable to seek to position %zu", pos);
699 MetaspaceShared::unrecoverable_loading_error();
700 }
701 }
702
703 // Read the FileMapInfo information from the file.
704 bool FileMapInfo::open_for_read() {
705 if (_file_open) {
706 return true;
707 }
708 const char* file_type = CDSConfig::type_of_archive_being_loaded();
709 const char* info = CDSConfig::is_dumping_final_static_archive() ?
710 "AOTConfiguration file " : "";
711 log_info(cds)("trying to map %s%s", info, _full_path);
712 int fd = os::open(_full_path, O_RDONLY | O_BINARY, 0);
713 if (fd < 0) {
714 if (errno == ENOENT) {
715 log_info(cds)("Specified %s not found (%s)", file_type, _full_path);
716 } else {
717 log_warning(cds)("Failed to open %s (%s)", file_type,
718 os::strerror(errno));
719 }
720 return false;
721 } else {
722 log_info(cds)("Opened %s %s.", file_type, _full_path);
723 }
724
725 _fd = fd;
726 _file_open = true;
727 return true;
728 }
729
730 // Write the FileMapInfo information to the file.
731
732 void FileMapInfo::open_for_write() {
733 LogMessage(cds) msg;
734 if (msg.is_info()) {
735 if (CDSConfig::is_dumping_preimage_static_archive()) {
736 msg.info("Writing binary AOTConfiguration file: ");
737 } else {
738 msg.info("Dumping shared data to file: ");
739 }
740 msg.info(" %s", _full_path);
741 }
742
743 #ifdef _WINDOWS // On Windows, need WRITE permission to remove the file.
744 chmod(_full_path, _S_IREAD | _S_IWRITE);
745 #endif
746
747 // Use remove() to delete the existing file because, on Unix, this will
748 // allow processes that have it open continued access to the file.
749 remove(_full_path);
750 int mode = CDSConfig::is_dumping_preimage_static_archive() ? 0666 : 0444;
751 int fd = os::open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, mode);
752 if (fd < 0) {
753 log_error(cds)("Unable to create %s %s: (%s).", CDSConfig::type_of_archive_being_written(), _full_path,
754 os::strerror(errno));
755 MetaspaceShared::writing_error();
756 return;
757 }
758 _fd = fd;
759 _file_open = true;
760
761 // Seek past the header. We will write the header after all regions are written
762 // and their CRCs computed.
763 size_t header_bytes = header()->header_size();
764
765 header_bytes = align_up(header_bytes, MetaspaceShared::core_region_alignment());
766 _file_offset = header_bytes;
767 seek_to_position(_file_offset);
768 }
769
770 // Write the header to the file, seek to the next allocation boundary.
771
772 void FileMapInfo::write_header() {
773 _file_offset = 0;
774 seek_to_position(_file_offset);
775 assert(is_file_position_aligned(), "must be");
776 write_bytes(header(), header()->header_size());
777 }
778
779 size_t FileMapRegion::used_aligned() const {
780 return align_up(used(), MetaspaceShared::core_region_alignment());
781 }
782
783 void FileMapRegion::init(int region_index, size_t mapping_offset, size_t size, bool read_only,
784 bool allow_exec, int crc) {
785 _is_heap_region = HeapShared::is_heap_region(region_index);
786 _is_bitmap_region = (region_index == MetaspaceShared::bm);
787 _mapping_offset = mapping_offset;
788 _used = size;
789 _read_only = read_only;
790 _allow_exec = allow_exec;
791 _crc = crc;
792 _mapped_from_file = false;
793 _mapped_base = nullptr;
794 _in_reserved_space = false;
795 }
796
797 void FileMapRegion::init_oopmap(size_t offset, size_t size_in_bits) {
798 _oopmap_offset = offset;
799 _oopmap_size_in_bits = size_in_bits;
800 }
801
802 void FileMapRegion::init_ptrmap(size_t offset, size_t size_in_bits) {
803 _ptrmap_offset = offset;
804 _ptrmap_size_in_bits = size_in_bits;
805 }
806
807 bool FileMapRegion::check_region_crc(char* base) const {
808 // This function should be called after the region has been properly
809 // loaded into memory via FileMapInfo::map_region() or FileMapInfo::read_region().
810 // I.e., this->mapped_base() must be valid.
811 size_t sz = used();
812 if (sz == 0) {
813 return true;
814 }
815
816 assert(base != nullptr, "must be initialized");
817 int crc = ClassLoader::crc32(0, base, (jint)sz);
818 if (crc != this->crc()) {
819 log_warning(cds)("Checksum verification failed.");
820 return false;
821 }
822 return true;
823 }
824
825 static const char* region_name(int region_index) {
826 static const char* names[] = {
827 "rw", "ro", "bm", "hp"
828 };
829 const int num_regions = sizeof(names)/sizeof(names[0]);
830 assert(0 <= region_index && region_index < num_regions, "sanity");
831
832 return names[region_index];
833 }
834
835 BitMapView FileMapInfo::bitmap_view(int region_index, bool is_oopmap) {
836 FileMapRegion* r = region_at(region_index);
837 char* bitmap_base = is_static() ? FileMapInfo::current_info()->map_bitmap_region() : FileMapInfo::dynamic_info()->map_bitmap_region();
838 bitmap_base += is_oopmap ? r->oopmap_offset() : r->ptrmap_offset();
839 size_t size_in_bits = is_oopmap ? r->oopmap_size_in_bits() : r->ptrmap_size_in_bits();
840
841 log_debug(cds, reloc)("mapped %s relocation %smap @ " INTPTR_FORMAT " (%zu bits)",
842 region_name(region_index), is_oopmap ? "oop" : "ptr",
843 p2i(bitmap_base), size_in_bits);
844
845 return BitMapView((BitMap::bm_word_t*)(bitmap_base), size_in_bits);
846 }
847
848 BitMapView FileMapInfo::oopmap_view(int region_index) {
849 return bitmap_view(region_index, /*is_oopmap*/true);
850 }
851
852 BitMapView FileMapInfo::ptrmap_view(int region_index) {
853 return bitmap_view(region_index, /*is_oopmap*/false);
854 }
855
856 void FileMapRegion::print(outputStream* st, int region_index) {
857 st->print_cr("============ region ============= %d \"%s\"", region_index, region_name(region_index));
858 st->print_cr("- crc: 0x%08x", _crc);
859 st->print_cr("- read_only: %d", _read_only);
860 st->print_cr("- allow_exec: %d", _allow_exec);
861 st->print_cr("- is_heap_region: %d", _is_heap_region);
862 st->print_cr("- is_bitmap_region: %d", _is_bitmap_region);
863 st->print_cr("- mapped_from_file: %d", _mapped_from_file);
864 st->print_cr("- file_offset: 0x%zx", _file_offset);
865 st->print_cr("- mapping_offset: 0x%zx", _mapping_offset);
866 st->print_cr("- used: %zu", _used);
867 st->print_cr("- oopmap_offset: 0x%zx", _oopmap_offset);
868 st->print_cr("- oopmap_size_in_bits: %zu", _oopmap_size_in_bits);
869 st->print_cr("- ptrmap_offset: 0x%zx", _ptrmap_offset);
870 st->print_cr("- ptrmap_size_in_bits: %zu", _ptrmap_size_in_bits);
871 st->print_cr("- mapped_base: " INTPTR_FORMAT, p2i(_mapped_base));
872 }
873
874 void FileMapInfo::write_region(int region, char* base, size_t size,
875 bool read_only, bool allow_exec) {
876 assert(CDSConfig::is_dumping_archive(), "sanity");
877
878 FileMapRegion* r = region_at(region);
879 char* requested_base;
880 size_t mapping_offset = 0;
881
882 if (region == MetaspaceShared::bm) {
883 requested_base = nullptr; // always null for bm region
884 } else if (size == 0) {
885 // This is an unused region (e.g., a heap region when !INCLUDE_CDS_JAVA_HEAP)
886 requested_base = nullptr;
887 } else if (HeapShared::is_heap_region(region)) {
888 assert(CDSConfig::is_dumping_heap(), "sanity");
889 #if INCLUDE_CDS_JAVA_HEAP
890 assert(!CDSConfig::is_dumping_dynamic_archive(), "must be");
891 requested_base = (char*)ArchiveHeapWriter::requested_address();
892 if (UseCompressedOops) {
893 mapping_offset = (size_t)((address)requested_base - CompressedOops::base());
894 assert((mapping_offset >> CompressedOops::shift()) << CompressedOops::shift() == mapping_offset, "must be");
895 } else {
896 mapping_offset = 0; // not used with !UseCompressedOops
897 }
898 #endif // INCLUDE_CDS_JAVA_HEAP
899 } else {
900 char* requested_SharedBaseAddress = (char*)MetaspaceShared::requested_base_address();
901 requested_base = ArchiveBuilder::current()->to_requested(base);
902 assert(requested_base >= requested_SharedBaseAddress, "must be");
903 mapping_offset = requested_base - requested_SharedBaseAddress;
904 }
905
906 r->set_file_offset(_file_offset);
907 int crc = ClassLoader::crc32(0, base, (jint)size);
908 if (size > 0) {
909 log_info(cds)("Shared file region (%s) %d: %8zu"
910 " bytes, addr " INTPTR_FORMAT " file offset 0x%08" PRIxPTR
911 " crc 0x%08x",
912 region_name(region), region, size, p2i(requested_base), _file_offset, crc);
913 }
914
915 r->init(region, mapping_offset, size, read_only, allow_exec, crc);
916
917 if (base != nullptr) {
918 write_bytes_aligned(base, size);
919 }
920 }
921
922 static size_t write_bitmap(const CHeapBitMap* map, char* output, size_t offset) {
923 size_t size_in_bytes = map->size_in_bytes();
924 map->write_to((BitMap::bm_word_t*)(output + offset), size_in_bytes);
925 return offset + size_in_bytes;
926 }
927
928 // The sorting code groups the objects with non-null oop/ptrs together.
929 // Relevant bitmaps then have lots of leading and trailing zeros, which
930 // we do not have to store.
931 size_t FileMapInfo::remove_bitmap_zeros(CHeapBitMap* map) {
932 BitMap::idx_t first_set = map->find_first_set_bit(0);
933 BitMap::idx_t last_set = map->find_last_set_bit(0);
934 size_t old_size = map->size();
935
936 // Slice and resize bitmap
937 map->truncate(first_set, last_set + 1);
938
939 assert(map->at(0), "First bit should be set");
940 assert(map->at(map->size() - 1), "Last bit should be set");
941 assert(map->size() <= old_size, "sanity");
942
943 return first_set;
944 }
945
946 char* FileMapInfo::write_bitmap_region(CHeapBitMap* rw_ptrmap, CHeapBitMap* ro_ptrmap, ArchiveHeapInfo* heap_info,
947 size_t &size_in_bytes) {
948 size_t removed_rw_leading_zeros = remove_bitmap_zeros(rw_ptrmap);
949 size_t removed_ro_leading_zeros = remove_bitmap_zeros(ro_ptrmap);
950 header()->set_rw_ptrmap_start_pos(removed_rw_leading_zeros);
951 header()->set_ro_ptrmap_start_pos(removed_ro_leading_zeros);
952 size_in_bytes = rw_ptrmap->size_in_bytes() + ro_ptrmap->size_in_bytes();
953
954 if (heap_info->is_used()) {
955 // Remove leading and trailing zeros
956 size_t removed_oop_leading_zeros = remove_bitmap_zeros(heap_info->oopmap());
957 size_t removed_ptr_leading_zeros = remove_bitmap_zeros(heap_info->ptrmap());
958 header()->set_heap_oopmap_start_pos(removed_oop_leading_zeros);
959 header()->set_heap_ptrmap_start_pos(removed_ptr_leading_zeros);
960
961 size_in_bytes += heap_info->oopmap()->size_in_bytes();
962 size_in_bytes += heap_info->ptrmap()->size_in_bytes();
963 }
964
965 // The bitmap region contains up to 4 parts:
966 // rw_ptrmap: metaspace pointers inside the read-write region
967 // ro_ptrmap: metaspace pointers inside the read-only region
968 // heap_info->oopmap(): Java oop pointers in the heap region
969 // heap_info->ptrmap(): metaspace pointers in the heap region
970 char* buffer = NEW_C_HEAP_ARRAY(char, size_in_bytes, mtClassShared);
971 size_t written = 0;
972
973 region_at(MetaspaceShared::rw)->init_ptrmap(0, rw_ptrmap->size());
974 written = write_bitmap(rw_ptrmap, buffer, written);
975
976 region_at(MetaspaceShared::ro)->init_ptrmap(written, ro_ptrmap->size());
977 written = write_bitmap(ro_ptrmap, buffer, written);
978
979 if (heap_info->is_used()) {
980 FileMapRegion* r = region_at(MetaspaceShared::hp);
981
982 r->init_oopmap(written, heap_info->oopmap()->size());
983 written = write_bitmap(heap_info->oopmap(), buffer, written);
984
985 r->init_ptrmap(written, heap_info->ptrmap()->size());
986 written = write_bitmap(heap_info->ptrmap(), buffer, written);
987 }
988
989 write_region(MetaspaceShared::bm, (char*)buffer, size_in_bytes, /*read_only=*/true, /*allow_exec=*/false);
990 return buffer;
991 }
992
993 size_t FileMapInfo::write_heap_region(ArchiveHeapInfo* heap_info) {
994 char* buffer_start = heap_info->buffer_start();
995 size_t buffer_size = heap_info->buffer_byte_size();
996 write_region(MetaspaceShared::hp, buffer_start, buffer_size, false, false);
997 header()->set_heap_root_segments(heap_info->heap_root_segments());
998 return buffer_size;
999 }
1000
1001 // Dump bytes to file -- at the current file position.
1002
1003 void FileMapInfo::write_bytes(const void* buffer, size_t nbytes) {
1004 assert(_file_open, "must be");
1005 if (!os::write(_fd, buffer, nbytes)) {
1006 // If the shared archive is corrupted, close it and remove it.
1007 close();
1008 remove(_full_path);
1009
1010 if (CDSConfig::is_dumping_preimage_static_archive()) {
1011 MetaspaceShared::writing_error("Unable to write to AOT configuration file.");
1012 } else if (CDSConfig::new_aot_flags_used()) {
1013 MetaspaceShared::writing_error("Unable to write to AOT cache.");
1014 } else {
1015 MetaspaceShared::writing_error("Unable to write to shared archive.");
1016 }
1017 }
1018 _file_offset += nbytes;
1019 }
1020
1021 bool FileMapInfo::is_file_position_aligned() const {
1022 return _file_offset == align_up(_file_offset,
1023 MetaspaceShared::core_region_alignment());
1024 }
1025
1026 // Align file position to an allocation unit boundary.
1027
1028 void FileMapInfo::align_file_position() {
1029 assert(_file_open, "must be");
1030 size_t new_file_offset = align_up(_file_offset,
1031 MetaspaceShared::core_region_alignment());
1032 if (new_file_offset != _file_offset) {
1033 _file_offset = new_file_offset;
1034 // Seek one byte back from the target and write a byte to insure
1035 // that the written file is the correct length.
1036 _file_offset -= 1;
1037 seek_to_position(_file_offset);
1038 char zero = 0;
1039 write_bytes(&zero, 1);
1040 }
1041 }
1042
1043
1044 // Dump bytes to file -- at the current file position.
1045
1046 void FileMapInfo::write_bytes_aligned(const void* buffer, size_t nbytes) {
1047 align_file_position();
1048 write_bytes(buffer, nbytes);
1049 align_file_position();
1050 }
1051
1052 // Close the shared archive file. This does NOT unmap mapped regions.
1053
1054 void FileMapInfo::close() {
1055 if (_file_open) {
1056 if (::close(_fd) < 0) {
1057 MetaspaceShared::unrecoverable_loading_error("Unable to close the shared archive file.");
1058 }
1059 _file_open = false;
1060 _fd = -1;
1061 }
1062 }
1063
1064 /*
1065 * Same as os::map_memory() but also pretouches if AlwaysPreTouch is enabled.
1066 */
1067 static char* map_memory(int fd, const char* file_name, size_t file_offset,
1068 char *addr, size_t bytes, bool read_only,
1069 bool allow_exec, MemTag mem_tag = mtNone) {
1070 char* mem = os::map_memory(fd, file_name, file_offset, addr, bytes,
1071 AlwaysPreTouch ? false : read_only,
1072 allow_exec, mem_tag);
1073 if (mem != nullptr && AlwaysPreTouch) {
1074 os::pretouch_memory(mem, mem + bytes);
1075 }
1076 return mem;
1077 }
1078
1079 // JVM/TI RedefineClasses() support:
1080 // Remap the shared readonly space to shared readwrite, private.
1081 bool FileMapInfo::remap_shared_readonly_as_readwrite() {
1082 int idx = MetaspaceShared::ro;
1083 FileMapRegion* r = region_at(idx);
1084 if (!r->read_only()) {
1085 // the space is already readwrite so we are done
1086 return true;
1087 }
1088 size_t size = r->used_aligned();
1089 if (!open_for_read()) {
1090 return false;
1091 }
1092 char *addr = r->mapped_base();
1093 // This path should not be reached for Windows; see JDK-8222379.
1094 assert(WINDOWS_ONLY(false) NOT_WINDOWS(true), "Don't call on Windows");
1095 // Replace old mapping with new one that is writable.
1096 char *base = os::map_memory(_fd, _full_path, r->file_offset(),
1097 addr, size, false /* !read_only */,
1098 r->allow_exec());
1099 close();
1100 // These have to be errors because the shared region is now unmapped.
1101 if (base == nullptr) {
1102 log_error(cds)("Unable to remap shared readonly space (errno=%d).", errno);
1103 vm_exit(1);
1104 }
1105 if (base != addr) {
1106 log_error(cds)("Unable to remap shared readonly space (errno=%d).", errno);
1107 vm_exit(1);
1108 }
1109 r->set_read_only(false);
1110 return true;
1111 }
1112
1113 // Memory map a region in the address space.
1114 static const char* shared_region_name[] = { "ReadWrite", "ReadOnly", "Bitmap", "Heap" };
1115
1116 MapArchiveResult FileMapInfo::map_regions(int regions[], int num_regions, char* mapped_base_address, ReservedSpace rs) {
1117 DEBUG_ONLY(FileMapRegion* last_region = nullptr);
1118 intx addr_delta = mapped_base_address - header()->requested_base_address();
1119
1120 // Make sure we don't attempt to use header()->mapped_base_address() unless
1121 // it's been successfully mapped.
1122 DEBUG_ONLY(header()->set_mapped_base_address((char*)(uintptr_t)0xdeadbeef);)
1123
1124 for (int i = 0; i < num_regions; i++) {
1125 int idx = regions[i];
1126 MapArchiveResult result = map_region(idx, addr_delta, mapped_base_address, rs);
1127 if (result != MAP_ARCHIVE_SUCCESS) {
1128 return result;
1129 }
1130 FileMapRegion* r = region_at(idx);
1131 DEBUG_ONLY(if (last_region != nullptr) {
1132 // Ensure that the OS won't be able to allocate new memory spaces between any mapped
1133 // regions, or else it would mess up the simple comparison in MetaspaceObj::is_shared().
1134 assert(r->mapped_base() == last_region->mapped_end(), "must have no gaps");
1135 }
1136 last_region = r;)
1137 log_info(cds)("Mapped %s region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)", is_static() ? "static " : "dynamic",
1138 idx, p2i(r->mapped_base()), p2i(r->mapped_end()),
1139 shared_region_name[idx]);
1140
1141 }
1142
1143 header()->set_mapped_base_address(header()->requested_base_address() + addr_delta);
1144 if (addr_delta != 0 && !relocate_pointers_in_core_regions(addr_delta)) {
1145 return MAP_ARCHIVE_OTHER_FAILURE;
1146 }
1147
1148 return MAP_ARCHIVE_SUCCESS;
1149 }
1150
1151 bool FileMapInfo::read_region(int i, char* base, size_t size, bool do_commit) {
1152 FileMapRegion* r = region_at(i);
1153 if (do_commit) {
1154 log_info(cds)("Commit %s region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)%s",
1155 is_static() ? "static " : "dynamic", i, p2i(base), p2i(base + size),
1156 shared_region_name[i], r->allow_exec() ? " exec" : "");
1157 if (!os::commit_memory(base, size, r->allow_exec())) {
1158 log_error(cds)("Failed to commit %s region #%d (%s)", is_static() ? "static " : "dynamic",
1159 i, shared_region_name[i]);
1160 return false;
1161 }
1162 }
1163 if (os::lseek(_fd, (long)r->file_offset(), SEEK_SET) != (int)r->file_offset() ||
1164 read_bytes(base, size) != size) {
1165 return false;
1166 }
1167
1168 if (VerifySharedSpaces && !r->check_region_crc(base)) {
1169 return false;
1170 }
1171
1172 r->set_mapped_from_file(false);
1173 r->set_mapped_base(base);
1174
1175 return true;
1176 }
1177
1178 MapArchiveResult FileMapInfo::map_region(int i, intx addr_delta, char* mapped_base_address, ReservedSpace rs) {
1179 assert(!HeapShared::is_heap_region(i), "sanity");
1180 FileMapRegion* r = region_at(i);
1181 size_t size = r->used_aligned();
1182 char *requested_addr = mapped_base_address + r->mapping_offset();
1183 assert(!is_mapped(), "must be not mapped yet");
1184 assert(requested_addr != nullptr, "must be specified");
1185
1186 r->set_mapped_from_file(false);
1187 r->set_in_reserved_space(false);
1188
1189 if (MetaspaceShared::use_windows_memory_mapping()) {
1190 // Windows cannot remap read-only shared memory to read-write when required for
1191 // RedefineClasses, which is also used by JFR. Always map windows regions as RW.
1192 r->set_read_only(false);
1193 } else if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space() ||
1194 Arguments::has_jfr_option()) {
1195 // If a tool agent is in use (debugging enabled), or JFR, we must map the address space RW
1196 r->set_read_only(false);
1197 } else if (addr_delta != 0) {
1198 r->set_read_only(false); // Need to patch the pointers
1199 }
1200
1201 if (MetaspaceShared::use_windows_memory_mapping() && rs.is_reserved()) {
1202 // This is the second time we try to map the archive(s). We have already created a ReservedSpace
1203 // that covers all the FileMapRegions to ensure all regions can be mapped. However, Windows
1204 // can't mmap into a ReservedSpace, so we just ::read() the data. We're going to patch all the
1205 // regions anyway, so there's no benefit for mmap anyway.
1206 if (!read_region(i, requested_addr, size, /* do_commit = */ true)) {
1207 log_info(cds)("Failed to read %s shared space into reserved space at " INTPTR_FORMAT,
1208 shared_region_name[i], p2i(requested_addr));
1209 return MAP_ARCHIVE_OTHER_FAILURE; // oom or I/O error.
1210 } else {
1211 assert(r->mapped_base() != nullptr, "must be initialized");
1212 }
1213 } else {
1214 // Note that this may either be a "fresh" mapping into unreserved address
1215 // space (Windows, first mapping attempt), or a mapping into pre-reserved
1216 // space (Posix). See also comment in MetaspaceShared::map_archives().
1217 char* base = map_memory(_fd, _full_path, r->file_offset(),
1218 requested_addr, size, r->read_only(),
1219 r->allow_exec(), mtClassShared);
1220 if (base != requested_addr) {
1221 log_info(cds)("Unable to map %s shared space at " INTPTR_FORMAT,
1222 shared_region_name[i], p2i(requested_addr));
1223 _memory_mapping_failed = true;
1224 return MAP_ARCHIVE_MMAP_FAILURE;
1225 }
1226
1227 if (VerifySharedSpaces && !r->check_region_crc(requested_addr)) {
1228 return MAP_ARCHIVE_OTHER_FAILURE;
1229 }
1230
1231 r->set_mapped_from_file(true);
1232 r->set_mapped_base(requested_addr);
1233 }
1234
1235 if (rs.is_reserved()) {
1236 char* mapped_base = r->mapped_base();
1237 assert(rs.base() <= mapped_base && mapped_base + size <= rs.end(),
1238 PTR_FORMAT " <= " PTR_FORMAT " < " PTR_FORMAT " <= " PTR_FORMAT,
1239 p2i(rs.base()), p2i(mapped_base), p2i(mapped_base + size), p2i(rs.end()));
1240 r->set_in_reserved_space(rs.is_reserved());
1241 }
1242 return MAP_ARCHIVE_SUCCESS;
1243 }
1244
1245 // The return value is the location of the archive relocation bitmap.
1246 char* FileMapInfo::map_bitmap_region() {
1247 FileMapRegion* r = region_at(MetaspaceShared::bm);
1248 if (r->mapped_base() != nullptr) {
1249 return r->mapped_base();
1250 }
1251 bool read_only = true, allow_exec = false;
1252 char* requested_addr = nullptr; // allow OS to pick any location
1253 char* bitmap_base = map_memory(_fd, _full_path, r->file_offset(),
1254 requested_addr, r->used_aligned(), read_only, allow_exec, mtClassShared);
1255 if (bitmap_base == nullptr) {
1256 log_info(cds)("failed to map relocation bitmap");
1257 return nullptr;
1258 }
1259
1260 if (VerifySharedSpaces && !r->check_region_crc(bitmap_base)) {
1261 log_error(cds)("relocation bitmap CRC error");
1262 if (!os::unmap_memory(bitmap_base, r->used_aligned())) {
1263 fatal("os::unmap_memory of relocation bitmap failed");
1264 }
1265 return nullptr;
1266 }
1267
1268 r->set_mapped_from_file(true);
1269 r->set_mapped_base(bitmap_base);
1270 log_info(cds)("Mapped %s region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)",
1271 is_static() ? "static " : "dynamic",
1272 MetaspaceShared::bm, p2i(r->mapped_base()), p2i(r->mapped_end()),
1273 shared_region_name[MetaspaceShared::bm]);
1274 return bitmap_base;
1275 }
1276
1277 class SharedDataRelocationTask : public ArchiveWorkerTask {
1278 private:
1279 BitMapView* const _rw_bm;
1280 BitMapView* const _ro_bm;
1281 SharedDataRelocator* const _rw_reloc;
1282 SharedDataRelocator* const _ro_reloc;
1283
1284 public:
1285 SharedDataRelocationTask(BitMapView* rw_bm, BitMapView* ro_bm, SharedDataRelocator* rw_reloc, SharedDataRelocator* ro_reloc) :
1286 ArchiveWorkerTask("Shared Data Relocation"),
1287 _rw_bm(rw_bm), _ro_bm(ro_bm), _rw_reloc(rw_reloc), _ro_reloc(ro_reloc) {}
1288
1289 void work(int chunk, int max_chunks) override {
1290 work_on(chunk, max_chunks, _rw_bm, _rw_reloc);
1291 work_on(chunk, max_chunks, _ro_bm, _ro_reloc);
1292 }
1293
1294 void work_on(int chunk, int max_chunks, BitMapView* bm, SharedDataRelocator* reloc) {
1295 BitMap::idx_t size = bm->size();
1296 BitMap::idx_t start = MIN2(size, size * chunk / max_chunks);
1297 BitMap::idx_t end = MIN2(size, size * (chunk + 1) / max_chunks);
1298 assert(end > start, "Sanity: no empty slices");
1299 bm->iterate(reloc, start, end);
1300 }
1301 };
1302
1303 // This is called when we cannot map the archive at the requested[ base address (usually 0x800000000).
1304 // We relocate all pointers in the 2 core regions (ro, rw).
1305 bool FileMapInfo::relocate_pointers_in_core_regions(intx addr_delta) {
1306 log_debug(cds, reloc)("runtime archive relocation start");
1307 char* bitmap_base = map_bitmap_region();
1308
1309 if (bitmap_base == nullptr) {
1310 return false; // OOM, or CRC check failure
1311 } else {
1312 BitMapView rw_ptrmap = ptrmap_view(MetaspaceShared::rw);
1313 BitMapView ro_ptrmap = ptrmap_view(MetaspaceShared::ro);
1314
1315 FileMapRegion* rw_region = first_core_region();
1316 FileMapRegion* ro_region = last_core_region();
1317
1318 // Patch all pointers inside the RW region
1319 address rw_patch_base = (address)rw_region->mapped_base();
1320 address rw_patch_end = (address)rw_region->mapped_end();
1321
1322 // Patch all pointers inside the RO region
1323 address ro_patch_base = (address)ro_region->mapped_base();
1324 address ro_patch_end = (address)ro_region->mapped_end();
1325
1326 // the current value of the pointers to be patched must be within this
1327 // range (i.e., must be between the requested base address and the address of the current archive).
1328 // Note: top archive may point to objects in the base archive, but not the other way around.
1329 address valid_old_base = (address)header()->requested_base_address();
1330 address valid_old_end = valid_old_base + mapping_end_offset();
1331
1332 // after patching, the pointers must point inside this range
1333 // (the requested location of the archive, as mapped at runtime).
1334 address valid_new_base = (address)header()->mapped_base_address();
1335 address valid_new_end = (address)mapped_end();
1336
1337 SharedDataRelocator rw_patcher((address*)rw_patch_base + header()->rw_ptrmap_start_pos(), (address*)rw_patch_end, valid_old_base, valid_old_end,
1338 valid_new_base, valid_new_end, addr_delta);
1339 SharedDataRelocator ro_patcher((address*)ro_patch_base + header()->ro_ptrmap_start_pos(), (address*)ro_patch_end, valid_old_base, valid_old_end,
1340 valid_new_base, valid_new_end, addr_delta);
1341
1342 if (AOTCacheParallelRelocation) {
1343 ArchiveWorkers workers;
1344 SharedDataRelocationTask task(&rw_ptrmap, &ro_ptrmap, &rw_patcher, &ro_patcher);
1345 workers.run_task(&task);
1346 } else {
1347 rw_ptrmap.iterate(&rw_patcher);
1348 ro_ptrmap.iterate(&ro_patcher);
1349 }
1350
1351 // The MetaspaceShared::bm region will be unmapped in MetaspaceShared::initialize_shared_spaces().
1352
1353 log_debug(cds, reloc)("runtime archive relocation done");
1354 return true;
1355 }
1356 }
1357
1358 size_t FileMapInfo::read_bytes(void* buffer, size_t count) {
1359 assert(_file_open, "Archive file is not open");
1360 size_t n = ::read(_fd, buffer, (unsigned int)count);
1361 if (n != count) {
1362 // Close the file if there's a problem reading it.
1363 close();
1364 return 0;
1365 }
1366 _file_offset += count;
1367 return count;
1368 }
1369
1370 // Get the total size in bytes of a read only region
1371 size_t FileMapInfo::readonly_total() {
1372 size_t total = 0;
1373 if (current_info() != nullptr) {
1374 FileMapRegion* r = FileMapInfo::current_info()->region_at(MetaspaceShared::ro);
1375 if (r->read_only()) total += r->used();
1376 }
1377 if (dynamic_info() != nullptr) {
1378 FileMapRegion* r = FileMapInfo::dynamic_info()->region_at(MetaspaceShared::ro);
1379 if (r->read_only()) total += r->used();
1380 }
1381 return total;
1382 }
1383
1384 #if INCLUDE_CDS_JAVA_HEAP
1385 MemRegion FileMapInfo::_mapped_heap_memregion;
1386
1387 bool FileMapInfo::has_heap_region() {
1388 return (region_at(MetaspaceShared::hp)->used() > 0);
1389 }
1390
1391 // Returns the address range of the archived heap region computed using the
1392 // current oop encoding mode. This range may be different than the one seen at
1393 // dump time due to encoding mode differences. The result is used in determining
1394 // if/how these regions should be relocated at run time.
1395 MemRegion FileMapInfo::get_heap_region_requested_range() {
1396 FileMapRegion* r = region_at(MetaspaceShared::hp);
1397 size_t size = r->used();
1398 assert(size > 0, "must have non-empty heap region");
1399
1400 address start = heap_region_requested_address();
1401 address end = start + size;
1402 log_info(cds)("Requested heap region [" INTPTR_FORMAT " - " INTPTR_FORMAT "] = %8zu bytes",
1403 p2i(start), p2i(end), size);
1404
1405 return MemRegion((HeapWord*)start, (HeapWord*)end);
1406 }
1407
1408 void FileMapInfo::map_or_load_heap_region() {
1409 bool success = false;
1410
1411 if (can_use_heap_region()) {
1412 if (ArchiveHeapLoader::can_map()) {
1413 success = map_heap_region();
1414 } else if (ArchiveHeapLoader::can_load()) {
1415 success = ArchiveHeapLoader::load_heap_region(this);
1416 } else {
1417 if (!UseCompressedOops && !ArchiveHeapLoader::can_map()) {
1418 log_info(cds)("Cannot use CDS heap data. Selected GC not compatible -XX:-UseCompressedOops");
1419 } else {
1420 log_info(cds)("Cannot use CDS heap data. UseEpsilonGC, UseG1GC, UseSerialGC, UseParallelGC, or UseShenandoahGC are required.");
1421 }
1422 }
1423 }
1424
1425 if (!success) {
1426 if (CDSConfig::is_using_aot_linked_classes()) {
1427 // It's too late to recover -- we have already committed to use the archived metaspace objects, but
1428 // the archived heap objects cannot be loaded, so we don't have the archived FMG to guarantee that
1429 // all AOT-linked classes are visible.
1430 //
1431 // We get here because the heap is too small. The app will fail anyway. So let's quit.
1432 MetaspaceShared::unrecoverable_loading_error("CDS archive has aot-linked classes but the archived "
1433 "heap objects cannot be loaded. Try increasing your heap size.");
1434 }
1435 CDSConfig::stop_using_full_module_graph("archive heap loading failed");
1436 }
1437 }
1438
1439 bool FileMapInfo::can_use_heap_region() {
1440 if (!has_heap_region()) {
1441 return false;
1442 }
1443 if (JvmtiExport::should_post_class_file_load_hook() && JvmtiExport::has_early_class_hook_env()) {
1444 ShouldNotReachHere(); // CDS should have been disabled.
1445 // The archived objects are mapped at JVM start-up, but we don't know if
1446 // j.l.String or j.l.Class might be replaced by the ClassFileLoadHook,
1447 // which would make the archived String or mirror objects invalid. Let's be safe and not
1448 // use the archived objects. These 2 classes are loaded during the JVMTI "early" stage.
1449 //
1450 // If JvmtiExport::has_early_class_hook_env() is false, the classes of some objects
1451 // in the archived subgraphs may be replaced by the ClassFileLoadHook. But that's OK
1452 // because we won't install an archived object subgraph if the klass of any of the
1453 // referenced objects are replaced. See HeapShared::initialize_from_archived_subgraph().
1454 }
1455
1456 // We pre-compute narrow Klass IDs with the runtime mapping start intended to be the base, and a shift of
1457 // ArchiveBuilder::precomputed_narrow_klass_shift. We enforce this encoding at runtime (see
1458 // CompressedKlassPointers::initialize_for_given_encoding()). Therefore, the following assertions must
1459 // hold:
1460 address archive_narrow_klass_base = (address)header()->mapped_base_address();
1461 const int archive_narrow_klass_pointer_bits = header()->narrow_klass_pointer_bits();
1462 const int archive_narrow_klass_shift = header()->narrow_klass_shift();
1463
1464 log_info(cds)("CDS archive was created with max heap size = %zuM, and the following configuration:",
1465 max_heap_size()/M);
1466 log_info(cds)(" narrow_klass_base at mapping start address, narrow_klass_pointer_bits = %d, narrow_klass_shift = %d",
1467 archive_narrow_klass_pointer_bits, archive_narrow_klass_shift);
1468 log_info(cds)(" narrow_oop_mode = %d, narrow_oop_base = " PTR_FORMAT ", narrow_oop_shift = %d",
1469 narrow_oop_mode(), p2i(narrow_oop_base()), narrow_oop_shift());
1470 log_info(cds)("The current max heap size = %zuM, G1HeapRegion::GrainBytes = %zu",
1471 MaxHeapSize/M, G1HeapRegion::GrainBytes);
1472 log_info(cds)(" narrow_klass_base = " PTR_FORMAT ", arrow_klass_pointer_bits = %d, narrow_klass_shift = %d",
1473 p2i(CompressedKlassPointers::base()), CompressedKlassPointers::narrow_klass_pointer_bits(), CompressedKlassPointers::shift());
1474 log_info(cds)(" narrow_oop_mode = %d, narrow_oop_base = " PTR_FORMAT ", narrow_oop_shift = %d",
1475 CompressedOops::mode(), p2i(CompressedOops::base()), CompressedOops::shift());
1476 log_info(cds)(" heap range = [" PTR_FORMAT " - " PTR_FORMAT "]",
1477 UseCompressedOops ? p2i(CompressedOops::begin()) :
1478 UseG1GC ? p2i((address)G1CollectedHeap::heap()->reserved().start()) : 0L,
1479 UseCompressedOops ? p2i(CompressedOops::end()) :
1480 UseG1GC ? p2i((address)G1CollectedHeap::heap()->reserved().end()) : 0L);
1481
1482 int err = 0;
1483 if ( archive_narrow_klass_base != CompressedKlassPointers::base() ||
1484 (err = 1, archive_narrow_klass_pointer_bits != CompressedKlassPointers::narrow_klass_pointer_bits()) ||
1485 (err = 2, archive_narrow_klass_shift != CompressedKlassPointers::shift()) ) {
1486 stringStream ss;
1487 switch (err) {
1488 case 0:
1489 ss.print("Unexpected encoding base encountered (" PTR_FORMAT ", expected " PTR_FORMAT ")",
1490 p2i(CompressedKlassPointers::base()), p2i(archive_narrow_klass_base));
1491 break;
1492 case 1:
1493 ss.print("Unexpected narrow Klass bit length encountered (%d, expected %d)",
1494 CompressedKlassPointers::narrow_klass_pointer_bits(), archive_narrow_klass_pointer_bits);
1495 break;
1496 case 2:
1497 ss.print("Unexpected narrow Klass shift encountered (%d, expected %d)",
1498 CompressedKlassPointers::shift(), archive_narrow_klass_shift);
1499 break;
1500 default:
1501 ShouldNotReachHere();
1502 };
1503 LogTarget(Info, cds) lt;
1504 if (lt.is_enabled()) {
1505 LogStream ls(lt);
1506 ls.print_raw(ss.base());
1507 header()->print(&ls);
1508 }
1509 assert(false, "%s", ss.base());
1510 }
1511
1512 return true;
1513 }
1514
1515 // The actual address of this region during dump time.
1516 address FileMapInfo::heap_region_dumptime_address() {
1517 FileMapRegion* r = region_at(MetaspaceShared::hp);
1518 assert(CDSConfig::is_using_archive(), "runtime only");
1519 assert(is_aligned(r->mapping_offset(), sizeof(HeapWord)), "must be");
1520 if (UseCompressedOops) {
1521 return /*dumptime*/ (address)((uintptr_t)narrow_oop_base() + r->mapping_offset());
1522 } else {
1523 return heap_region_requested_address();
1524 }
1525 }
1526
1527 // The address where this region can be mapped into the runtime heap without
1528 // patching any of the pointers that are embedded in this region.
1529 address FileMapInfo::heap_region_requested_address() {
1530 assert(CDSConfig::is_using_archive(), "runtime only");
1531 FileMapRegion* r = region_at(MetaspaceShared::hp);
1532 assert(is_aligned(r->mapping_offset(), sizeof(HeapWord)), "must be");
1533 assert(ArchiveHeapLoader::can_use(), "GC must support mapping or loading");
1534 if (UseCompressedOops) {
1535 // We can avoid relocation if each region's offset from the runtime CompressedOops::base()
1536 // is the same as its offset from the CompressedOops::base() during dumptime.
1537 // Note that CompressedOops::base() may be different between dumptime and runtime.
1538 //
1539 // Example:
1540 // Dumptime base = 0x1000 and shift is 0. We have a region at address 0x2000. There's a
1541 // narrowOop P stored in this region that points to an object at address 0x2200.
1542 // P's encoded value is 0x1200.
1543 //
1544 // Runtime base = 0x4000 and shift is also 0. If we map this region at 0x5000, then
1545 // the value P can remain 0x1200. The decoded address = (0x4000 + (0x1200 << 0)) = 0x5200,
1546 // which is the runtime location of the referenced object.
1547 return /*runtime*/ (address)((uintptr_t)CompressedOops::base() + r->mapping_offset());
1548 } else {
1549 // This was the hard-coded requested base address used at dump time. With uncompressed oops,
1550 // the heap range is assigned by the OS so we will most likely have to relocate anyway, no matter
1551 // what base address was picked at duump time.
1552 return (address)ArchiveHeapWriter::NOCOOPS_REQUESTED_BASE;
1553 }
1554 }
1555
1556 bool FileMapInfo::map_heap_region() {
1557 if (map_heap_region_impl()) {
1558 #ifdef ASSERT
1559 // The "old" regions must be parsable -- we cannot have any unused space
1560 // at the start of the lowest G1 region that contains archived objects.
1561 assert(is_aligned(_mapped_heap_memregion.start(), G1HeapRegion::GrainBytes), "must be");
1562
1563 // Make sure we map at the very top of the heap - see comments in
1564 // init_heap_region_relocation().
1565 MemRegion heap_range = G1CollectedHeap::heap()->reserved();
1566 assert(heap_range.contains(_mapped_heap_memregion), "must be");
1567
1568 address heap_end = (address)heap_range.end();
1569 address mapped_heap_region_end = (address)_mapped_heap_memregion.end();
1570 assert(heap_end >= mapped_heap_region_end, "must be");
1571 assert(heap_end - mapped_heap_region_end < (intx)(G1HeapRegion::GrainBytes),
1572 "must be at the top of the heap to avoid fragmentation");
1573 #endif
1574
1575 ArchiveHeapLoader::set_mapped();
1576 return true;
1577 } else {
1578 return false;
1579 }
1580 }
1581
1582 bool FileMapInfo::map_heap_region_impl() {
1583 assert(UseG1GC, "the following code assumes G1");
1584
1585 FileMapRegion* r = region_at(MetaspaceShared::hp);
1586 size_t size = r->used();
1587 if (size == 0) {
1588 return false; // no archived java heap data
1589 }
1590
1591 size_t word_size = size / HeapWordSize;
1592 address requested_start = heap_region_requested_address();
1593
1594 log_info(cds)("Preferred address to map heap data (to avoid relocation) is " INTPTR_FORMAT, p2i(requested_start));
1595
1596 // allocate from java heap
1597 HeapWord* start = G1CollectedHeap::heap()->alloc_archive_region(word_size, (HeapWord*)requested_start);
1598 if (start == nullptr) {
1599 log_info(cds)("UseSharedSpaces: Unable to allocate java heap region for archive heap.");
1600 return false;
1601 }
1602
1603 _mapped_heap_memregion = MemRegion(start, word_size);
1604
1605 // Map the archived heap data. No need to call MemTracker::record_virtual_memory_tag()
1606 // for mapped region as it is part of the reserved java heap, which is already recorded.
1607 char* addr = (char*)_mapped_heap_memregion.start();
1608 char* base;
1609
1610 if (MetaspaceShared::use_windows_memory_mapping()) {
1611 if (!read_region(MetaspaceShared::hp, addr,
1612 align_up(_mapped_heap_memregion.byte_size(), os::vm_page_size()),
1613 /* do_commit = */ true)) {
1614 dealloc_heap_region();
1615 log_error(cds)("Failed to read archived heap region into " INTPTR_FORMAT, p2i(addr));
1616 return false;
1617 }
1618 // Checks for VerifySharedSpaces is already done inside read_region()
1619 base = addr;
1620 } else {
1621 base = map_memory(_fd, _full_path, r->file_offset(),
1622 addr, _mapped_heap_memregion.byte_size(), r->read_only(),
1623 r->allow_exec());
1624 if (base == nullptr || base != addr) {
1625 dealloc_heap_region();
1626 log_info(cds)("UseSharedSpaces: Unable to map at required address in java heap. "
1627 INTPTR_FORMAT ", size = %zu bytes",
1628 p2i(addr), _mapped_heap_memregion.byte_size());
1629 return false;
1630 }
1631
1632 if (VerifySharedSpaces && !r->check_region_crc(base)) {
1633 dealloc_heap_region();
1634 log_info(cds)("UseSharedSpaces: mapped heap region is corrupt");
1635 return false;
1636 }
1637 }
1638
1639 r->set_mapped_base(base);
1640
1641 // If the requested range is different from the range allocated by GC, then
1642 // the pointers need to be patched.
1643 address mapped_start = (address) _mapped_heap_memregion.start();
1644 ptrdiff_t delta = mapped_start - requested_start;
1645 if (UseCompressedOops &&
1646 (narrow_oop_mode() != CompressedOops::mode() ||
1647 narrow_oop_shift() != CompressedOops::shift())) {
1648 _heap_pointers_need_patching = true;
1649 }
1650 if (delta != 0) {
1651 _heap_pointers_need_patching = true;
1652 }
1653 ArchiveHeapLoader::init_mapped_heap_info(mapped_start, delta, narrow_oop_shift());
1654
1655 if (_heap_pointers_need_patching) {
1656 char* bitmap_base = map_bitmap_region();
1657 if (bitmap_base == nullptr) {
1658 log_info(cds)("CDS heap cannot be used because bitmap region cannot be mapped");
1659 dealloc_heap_region();
1660 _heap_pointers_need_patching = false;
1661 return false;
1662 }
1663 }
1664 log_info(cds)("Heap data mapped at " INTPTR_FORMAT ", size = %8zu bytes",
1665 p2i(mapped_start), _mapped_heap_memregion.byte_size());
1666 log_info(cds)("CDS heap data relocation delta = %zd bytes", delta);
1667 return true;
1668 }
1669
1670 narrowOop FileMapInfo::encoded_heap_region_dumptime_address() {
1671 assert(CDSConfig::is_using_archive(), "runtime only");
1672 assert(UseCompressedOops, "sanity");
1673 FileMapRegion* r = region_at(MetaspaceShared::hp);
1674 return CompressedOops::narrow_oop_cast(r->mapping_offset() >> narrow_oop_shift());
1675 }
1676
1677 void FileMapInfo::patch_heap_embedded_pointers() {
1678 if (!ArchiveHeapLoader::is_mapped() || !_heap_pointers_need_patching) {
1679 return;
1680 }
1681
1682 char* bitmap_base = map_bitmap_region();
1683 assert(bitmap_base != nullptr, "must have already been mapped");
1684
1685 FileMapRegion* r = region_at(MetaspaceShared::hp);
1686 ArchiveHeapLoader::patch_embedded_pointers(
1687 this, _mapped_heap_memregion,
1688 (address)(region_at(MetaspaceShared::bm)->mapped_base()) + r->oopmap_offset(),
1689 r->oopmap_size_in_bits());
1690 }
1691
1692 void FileMapInfo::fixup_mapped_heap_region() {
1693 if (ArchiveHeapLoader::is_mapped()) {
1694 assert(!_mapped_heap_memregion.is_empty(), "sanity");
1695
1696 // Populate the archive regions' G1BlockOffsetTables. That ensures
1697 // fast G1BlockOffsetTable::block_start operations for any given address
1698 // within the archive regions when trying to find start of an object
1699 // (e.g. during card table scanning).
1700 G1CollectedHeap::heap()->populate_archive_regions_bot(_mapped_heap_memregion);
1701 }
1702 }
1703
1704 // dealloc the archive regions from java heap
1705 void FileMapInfo::dealloc_heap_region() {
1706 G1CollectedHeap::heap()->dealloc_archive_regions(_mapped_heap_memregion);
1707 }
1708 #endif // INCLUDE_CDS_JAVA_HEAP
1709
1710 void FileMapInfo::unmap_regions(int regions[], int num_regions) {
1711 for (int r = 0; r < num_regions; r++) {
1712 int idx = regions[r];
1713 unmap_region(idx);
1714 }
1715 }
1716
1717 // Unmap a memory region in the address space.
1718
1719 void FileMapInfo::unmap_region(int i) {
1720 FileMapRegion* r = region_at(i);
1721 char* mapped_base = r->mapped_base();
1722 size_t size = r->used_aligned();
1723
1724 if (mapped_base != nullptr) {
1725 if (size > 0 && r->mapped_from_file()) {
1726 log_info(cds)("Unmapping region #%d at base " INTPTR_FORMAT " (%s)", i, p2i(mapped_base),
1727 shared_region_name[i]);
1728 if (r->in_reserved_space()) {
1729 // This region was mapped inside a ReservedSpace. Its memory will be freed when the ReservedSpace
1730 // is released. Zero it so that we don't accidentally read its content.
1731 log_info(cds)("Region #%d (%s) is in a reserved space, it will be freed when the space is released", i, shared_region_name[i]);
1732 } else {
1733 if (!os::unmap_memory(mapped_base, size)) {
1734 fatal("os::unmap_memory failed");
1735 }
1736 }
1737 }
1738 r->set_mapped_base(nullptr);
1739 }
1740 }
1741
1742 void FileMapInfo::assert_mark(bool check) {
1743 if (!check) {
1744 MetaspaceShared::unrecoverable_loading_error("Mark mismatch while restoring from shared file.");
1745 }
1746 }
1747
1748 FileMapInfo* FileMapInfo::_current_info = nullptr;
1749 FileMapInfo* FileMapInfo::_dynamic_archive_info = nullptr;
1750 bool FileMapInfo::_heap_pointers_need_patching = false;
1751 bool FileMapInfo::_memory_mapping_failed = false;
1752
1753 // Open the shared archive file, read and validate the header
1754 // information (version, boot classpath, etc.). If initialization
1755 // fails, shared spaces are disabled and the file is closed.
1756 //
1757 // Validation of the archive is done in two steps:
1758 //
1759 // [1] validate_header() - done here.
1760 // [2] validate_shared_path_table - this is done later, because the table is in the RO
1761 // region of the archive, which is not mapped yet.
1762 bool FileMapInfo::initialize() {
1763 assert(CDSConfig::is_using_archive(), "UseSharedSpaces expected.");
1764 assert(Arguments::has_jimage(), "The shared archive file cannot be used with an exploded module build.");
1765
1766 if (JvmtiExport::should_post_class_file_load_hook() && JvmtiExport::has_early_class_hook_env()) {
1767 // CDS assumes that no classes resolved in vmClasses::resolve_all()
1768 // are replaced at runtime by JVMTI ClassFileLoadHook. All of those classes are resolved
1769 // during the JVMTI "early" stage, so we can still use CDS if
1770 // JvmtiExport::has_early_class_hook_env() is false.
1771 log_info(cds)("CDS is disabled because early JVMTI ClassFileLoadHook is in use.");
1772 return false;
1773 }
1774
1775 if (!open_for_read() || !init_from_file(_fd) || !validate_header()) {
1776 if (_is_static) {
1777 log_info(cds)("Initialize static archive failed.");
1778 return false;
1779 } else {
1780 log_info(cds)("Initialize dynamic archive failed.");
1781 if (AutoCreateSharedArchive) {
1782 CDSConfig::enable_dumping_dynamic_archive();
1783 ArchiveClassesAtExit = CDSConfig::dynamic_archive_path();
1784 }
1785 return false;
1786 }
1787 }
1788
1789 return true;
1790 }
1791
1792 bool FileMapInfo::validate_aot_class_linking() {
1793 // These checks need to be done after FileMapInfo::initialize(), which gets called before Universe::heap()
1794 // is available.
1795 if (header()->has_aot_linked_classes()) {
1796 CDSConfig::set_has_aot_linked_classes(true);
1797 if (JvmtiExport::should_post_class_file_load_hook()) {
1798 log_error(cds)("CDS archive has aot-linked classes. It cannot be used when JVMTI ClassFileLoadHook is in use.");
1799 return false;
1800 }
1801 if (JvmtiExport::has_early_vmstart_env()) {
1802 log_error(cds)("CDS archive has aot-linked classes. It cannot be used when JVMTI early vm start is in use.");
1803 return false;
1804 }
1805 if (!CDSConfig::is_using_full_module_graph()) {
1806 log_error(cds)("CDS archive has aot-linked classes. It cannot be used when archived full module graph is not used.");
1807 return false;
1808 }
1809
1810 const char* prop = Arguments::get_property("java.security.manager");
1811 if (prop != nullptr && strcmp(prop, "disallow") != 0) {
1812 log_error(cds)("CDS archive has aot-linked classes. It cannot be used with -Djava.security.manager=%s.", prop);
1813 return false;
1814 }
1815
1816 #if INCLUDE_JVMTI
1817 if (Arguments::has_jdwp_agent()) {
1818 log_error(cds)("CDS archive has aot-linked classes. It cannot be used with JDWP agent");
1819 return false;
1820 }
1821 #endif
1822 }
1823
1824 return true;
1825 }
1826
1827 // The 2 core spaces are RW->RO
1828 FileMapRegion* FileMapInfo::first_core_region() const {
1829 return region_at(MetaspaceShared::rw);
1830 }
1831
1832 FileMapRegion* FileMapInfo::last_core_region() const {
1833 return region_at(MetaspaceShared::ro);
1834 }
1835
1836 void FileMapInfo::print(outputStream* st) const {
1837 header()->print(st);
1838 if (!is_static()) {
1839 dynamic_header()->print(st);
1840 }
1841 }
1842
1843 void FileMapHeader::set_as_offset(char* p, size_t *offset) {
1844 *offset = ArchiveBuilder::current()->any_to_offset((address)p);
1845 }
1846
1847 int FileMapHeader::compute_crc() {
1848 char* start = (char*)this;
1849 // start computing from the field after _header_size to end of base archive name.
1850 char* buf = (char*)&(_generic_header._header_size) + sizeof(_generic_header._header_size);
1851 size_t sz = header_size() - (buf - start);
1852 int crc = ClassLoader::crc32(0, buf, (jint)sz);
1853 return crc;
1854 }
1855
1856 // This function should only be called during run time with UseSharedSpaces enabled.
1857 bool FileMapHeader::validate() {
1858 const char* file_type = CDSConfig::type_of_archive_being_loaded();
1859 if (_obj_alignment != ObjectAlignmentInBytes) {
1860 log_info(cds)("The %s's ObjectAlignmentInBytes of %d"
1861 " does not equal the current ObjectAlignmentInBytes of %d.",
1862 file_type, _obj_alignment, ObjectAlignmentInBytes);
1863 return false;
1864 }
1865 if (_compact_strings != CompactStrings) {
1866 log_info(cds)("The %s's CompactStrings setting (%s)"
1867 " does not equal the current CompactStrings setting (%s).", file_type,
1868 _compact_strings ? "enabled" : "disabled",
1869 CompactStrings ? "enabled" : "disabled");
1870 return false;
1871 }
1872
1873 // This must be done after header validation because it might change the
1874 // header data
1875 const char* prop = Arguments::get_property("java.system.class.loader");
1876 if (prop != nullptr) {
1877 if (has_aot_linked_classes()) {
1878 log_error(cds)("CDS archive has aot-linked classes. It cannot be used when the "
1879 "java.system.class.loader property is specified.");
1880 return false;
1881 }
1882 log_warning(cds)("Archived non-system classes are disabled because the "
1883 "java.system.class.loader property is specified (value = \"%s\"). "
1884 "To use archived non-system classes, this property must not be set", prop);
1885 _has_platform_or_app_classes = false;
1886 }
1887
1888
1889 if (!_verify_local && BytecodeVerificationLocal) {
1890 // we cannot load boot classes, so there's no point of using the CDS archive
1891 log_info(cds)("The %s's BytecodeVerificationLocal setting (%s)"
1892 " does not equal the current BytecodeVerificationLocal setting (%s).", file_type,
1893 _verify_local ? "enabled" : "disabled",
1894 BytecodeVerificationLocal ? "enabled" : "disabled");
1895 return false;
1896 }
1897
1898 // For backwards compatibility, we don't check the BytecodeVerificationRemote setting
1899 // if the archive only contains system classes.
1900 if (_has_platform_or_app_classes
1901 && !_verify_remote // we didn't verify the archived platform/app classes
1902 && BytecodeVerificationRemote) { // but we want to verify all loaded platform/app classes
1903 log_info(cds)("The %s was created with less restrictive "
1904 "verification setting than the current setting.", file_type);
1905 // Pretend that we didn't have any archived platform/app classes, so they won't be loaded
1906 // by SystemDictionaryShared.
1907 _has_platform_or_app_classes = false;
1908 }
1909
1910 // Java agents are allowed during run time. Therefore, the following condition is not
1911 // checked: (!_allow_archiving_with_java_agent && AllowArchivingWithJavaAgent)
1912 // Note: _allow_archiving_with_java_agent is set in the shared archive during dump time
1913 // while AllowArchivingWithJavaAgent is set during the current run.
1914 if (_allow_archiving_with_java_agent && !AllowArchivingWithJavaAgent) {
1915 log_warning(cds)("The setting of the AllowArchivingWithJavaAgent is different "
1916 "from the setting in the %s.", file_type);
1917 return false;
1918 }
1919
1920 if (_allow_archiving_with_java_agent) {
1921 log_warning(cds)("This %s was created with AllowArchivingWithJavaAgent. It should be used "
1922 "for testing purposes only and should not be used in a production environment", file_type);
1923 }
1924
1925 log_info(cds)("The %s was created with UseCompressedOops = %d, UseCompressedClassPointers = %d, UseCompactObjectHeaders = %d",
1926 file_type, compressed_oops(), compressed_class_pointers(), compact_headers());
1927 if (compressed_oops() != UseCompressedOops || compressed_class_pointers() != UseCompressedClassPointers) {
1928 log_warning(cds)("Unable to use %s.\nThe saved state of UseCompressedOops and UseCompressedClassPointers is "
1929 "different from runtime, CDS will be disabled.", file_type);
1930 return false;
1931 }
1932
1933 if (compact_headers() != UseCompactObjectHeaders) {
1934 log_warning(cds)("Unable to use %s.\nThe %s's UseCompactObjectHeaders setting (%s)"
1935 " does not equal the current UseCompactObjectHeaders setting (%s).", file_type, file_type,
1936 _compact_headers ? "enabled" : "disabled",
1937 UseCompactObjectHeaders ? "enabled" : "disabled");
1938 return false;
1939 }
1940
1941 if (!_use_optimized_module_handling && !CDSConfig::is_dumping_final_static_archive()) {
1942 CDSConfig::stop_using_optimized_module_handling();
1943 log_info(cds)("optimized module handling: disabled because archive was created without optimized module handling");
1944 }
1945
1946 if (is_static()) {
1947 // Only the static archive can contain the full module graph.
1948 if (!_has_full_module_graph) {
1949 CDSConfig::stop_using_full_module_graph("archive was created without full module graph");
1950 }
1951 }
1952
1953 return true;
1954 }
1955
1956 bool FileMapInfo::validate_header() {
1957 if (!header()->validate()) {
1958 return false;
1959 }
1960 if (_is_static) {
1961 return true;
1962 } else {
1963 return DynamicArchive::validate(this);
1964 }
1965 }
1966
1967 #if INCLUDE_JVMTI
1968 ClassPathEntry** FileMapInfo::_classpath_entries_for_jvmti = nullptr;
1969
1970 ClassPathEntry* FileMapInfo::get_classpath_entry_for_jvmti(int i, TRAPS) {
1971 if (i == 0) {
1972 // index 0 corresponds to the ClassPathImageEntry which is a globally shared object
1973 // and should never be deleted.
1974 return ClassLoader::get_jrt_entry();
1975 }
1976 ClassPathEntry* ent = _classpath_entries_for_jvmti[i];
1977 if (ent == nullptr) {
1978 const AOTClassLocation* cl = AOTClassLocationConfig::runtime()->class_location_at(i);
1979 const char* path = cl->path();
1980 struct stat st;
1981 if (os::stat(path, &st) != 0) {
1982 char *msg = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(path) + 128);
1983 jio_snprintf(msg, strlen(path) + 127, "error in finding JAR file %s", path);
1984 THROW_MSG_(vmSymbols::java_io_IOException(), msg, nullptr);
1985 } else {
1986 ent = ClassLoader::create_class_path_entry(THREAD, path, &st);
1987 if (ent == nullptr) {
1988 char *msg = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(path) + 128);
1989 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
1990 THROW_MSG_(vmSymbols::java_io_IOException(), msg, nullptr);
1991 }
1992 }
1993
1994 MutexLocker mu(THREAD, CDSClassFileStream_lock);
1995 if (_classpath_entries_for_jvmti[i] == nullptr) {
1996 _classpath_entries_for_jvmti[i] = ent;
1997 } else {
1998 // Another thread has beat me to creating this entry
1999 delete ent;
2000 ent = _classpath_entries_for_jvmti[i];
2001 }
2002 }
2003
2004 return ent;
2005 }
2006
2007 ClassFileStream* FileMapInfo::open_stream_for_jvmti(InstanceKlass* ik, Handle class_loader, TRAPS) {
2008 int path_index = ik->shared_classpath_index();
2009 assert(path_index >= 0, "should be called for shared built-in classes only");
2010 assert(path_index < AOTClassLocationConfig::runtime()->length(), "sanity");
2011
2012 ClassPathEntry* cpe = get_classpath_entry_for_jvmti(path_index, CHECK_NULL);
2013 assert(cpe != nullptr, "must be");
2014
2015 Symbol* name = ik->name();
2016 const char* const class_name = name->as_C_string();
2017 const char* const file_name = ClassLoader::file_name_for_class_name(class_name,
2018 name->utf8_length());
2019 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader());
2020 const AOTClassLocation* cl = AOTClassLocationConfig::runtime()->class_location_at(path_index);
2021 ClassFileStream* cfs;
2022 if (class_loader() != nullptr && cl->is_multi_release_jar()) {
2023 // This class was loaded from a multi-release JAR file during dump time. The
2024 // process for finding its classfile is complex. Let's defer to the Java code
2025 // in java.lang.ClassLoader.
2026 cfs = get_stream_from_class_loader(class_loader, cpe, file_name, CHECK_NULL);
2027 } else {
2028 cfs = cpe->open_stream_for_loader(THREAD, file_name, loader_data);
2029 }
2030 assert(cfs != nullptr, "must be able to read the classfile data of shared classes for built-in loaders.");
2031 log_debug(cds, jvmti)("classfile data for %s [%d: %s] = %d bytes", class_name, path_index,
2032 cfs->source(), cfs->length());
2033 return cfs;
2034 }
2035
2036 ClassFileStream* FileMapInfo::get_stream_from_class_loader(Handle class_loader,
2037 ClassPathEntry* cpe,
2038 const char* file_name,
2039 TRAPS) {
2040 JavaValue result(T_OBJECT);
2041 oop class_name = java_lang_String::create_oop_from_str(file_name, THREAD);
2042 Handle h_class_name = Handle(THREAD, class_name);
2043
2044 // byte[] ClassLoader.getResourceAsByteArray(String name)
2045 JavaCalls::call_virtual(&result,
2046 class_loader,
2047 vmClasses::ClassLoader_klass(),
2048 vmSymbols::getResourceAsByteArray_name(),
2049 vmSymbols::getResourceAsByteArray_signature(),
2050 h_class_name,
2051 CHECK_NULL);
2052 assert(result.get_type() == T_OBJECT, "just checking");
2053 oop obj = result.get_oop();
2054 assert(obj != nullptr, "ClassLoader.getResourceAsByteArray should not return null");
2055
2056 // copy from byte[] to a buffer
2057 typeArrayOop ba = typeArrayOop(obj);
2058 jint len = ba->length();
2059 u1* buffer = NEW_RESOURCE_ARRAY(u1, len);
2060 ArrayAccess<>::arraycopy_to_native<>(ba, typeArrayOopDesc::element_offset<jbyte>(0), buffer, len);
2061
2062 return new ClassFileStream(buffer, len, cpe->name());
2063 }
2064 #endif