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 inline void CDSMustMatchFlags::do_print(outputStream* st, bool v) {
89 st->print("%s", v ? "true" : "false");
90 }
91
92 inline void CDSMustMatchFlags::do_print(outputStream* st, intx v) {
93 st->print("%zd", v);
94 }
95
96 inline void CDSMustMatchFlags::do_print(outputStream* st, uintx v) {
97 st->print("%zu", v);
98 }
99
100 inline void CDSMustMatchFlags::do_print(outputStream* st, double v) {
101 st->print("%f", v);
102 }
103
104 void CDSMustMatchFlags::init() {
105 assert(CDSConfig::is_dumping_archive(), "sanity");
106 _max_name_width = 0;
107
108 #define INIT_CDS_MUST_MATCH_FLAG(n) \
109 _v_##n = n; \
110 _max_name_width = MAX2(_max_name_width,strlen(#n));
111 CDS_MUST_MATCH_FLAGS_DO(INIT_CDS_MUST_MATCH_FLAG);
112 #undef INIT_CDS_MUST_MATCH_FLAG
113 }
114
115 bool CDSMustMatchFlags::runtime_check() const {
116 #define CHECK_CDS_MUST_MATCH_FLAG(n) \
117 if (_v_##n != n) { \
118 ResourceMark rm; \
119 stringStream ss; \
120 ss.print("VM option %s is different between dumptime (", #n); \
121 do_print(&ss, _v_ ## n); \
122 ss.print(") and runtime ("); \
123 do_print(&ss, n); \
124 ss.print(")"); \
125 log_info(cds)("%s", ss.as_string()); \
126 return false; \
127 }
128 CDS_MUST_MATCH_FLAGS_DO(CHECK_CDS_MUST_MATCH_FLAG);
129 #undef CHECK_CDS_MUST_MATCH_FLAG
130
131 return true;
132 }
133
134 void CDSMustMatchFlags::print_info() const {
135 LogTarget(Info, cds) lt;
136 if (lt.is_enabled()) {
137 LogStream ls(lt);
138 ls.print_cr("Recorded VM flags during dumptime:");
139 print(&ls);
140 }
141 }
142
143 void CDSMustMatchFlags::print(outputStream* st) const {
144 #define PRINT_CDS_MUST_MATCH_FLAG(n) \
145 st->print("- %-s ", #n); \
146 st->sp(int(_max_name_width - strlen(#n))); \
147 do_print(st, _v_##n); \
148 st->cr();
149 CDS_MUST_MATCH_FLAGS_DO(PRINT_CDS_MUST_MATCH_FLAG);
150 #undef PRINT_CDS_MUST_MATCH_FLAG
151 }
152
153 // Fill in the fileMapInfo structure with data about this VM instance.
154
155 // This method copies the vm version info into header_version. If the version is too
156 // long then a truncated version, which has a hash code appended to it, is copied.
157 //
158 // Using a template enables this method to verify that header_version is an array of
159 // length JVM_IDENT_MAX. This ensures that the code that writes to the CDS file and
160 // the code that reads the CDS file will both use the same size buffer. Hence, will
161 // use identical truncation. This is necessary for matching of truncated versions.
162 template <int N> static void get_header_version(char (&header_version) [N]) {
163 assert(N == JVM_IDENT_MAX, "Bad header_version size");
164
165 const char *vm_version = VM_Version::internal_vm_info_string();
166 const int version_len = (int)strlen(vm_version);
167
168 memset(header_version, 0, JVM_IDENT_MAX);
169
170 if (version_len < (JVM_IDENT_MAX-1)) {
171 strcpy(header_version, vm_version);
172
173 } else {
174 // Get the hash value. Use a static seed because the hash needs to return the same
175 // value over multiple jvm invocations.
176 uint32_t hash = AltHashing::halfsiphash_32(8191, (const uint8_t*)vm_version, version_len);
177
178 // Truncate the ident, saving room for the 8 hex character hash value.
179 strncpy(header_version, vm_version, JVM_IDENT_MAX-9);
180
181 // Append the hash code as eight hex digits.
182 os::snprintf_checked(&header_version[JVM_IDENT_MAX-9], 9, "%08x", hash);
183 header_version[JVM_IDENT_MAX-1] = 0; // Null terminate.
184 }
185
186 assert(header_version[JVM_IDENT_MAX-1] == 0, "must be");
187 }
188
189 FileMapInfo::FileMapInfo(const char* full_path, bool is_static) :
190 _is_static(is_static), _file_open(false), _is_mapped(false), _fd(-1), _file_offset(0),
191 _full_path(full_path), _base_archive_name(nullptr), _header(nullptr) {
192 if (_is_static) {
193 assert(_current_info == nullptr, "must be singleton"); // not thread safe
194 _current_info = this;
195 } else {
196 assert(_dynamic_archive_info == nullptr, "must be singleton"); // not thread safe
197 _dynamic_archive_info = this;
198 }
199 }
200
201 FileMapInfo::~FileMapInfo() {
202 if (_is_static) {
203 assert(_current_info == this, "must be singleton"); // not thread safe
204 _current_info = nullptr;
205 } else {
206 assert(_dynamic_archive_info == this, "must be singleton"); // not thread safe
207 _dynamic_archive_info = nullptr;
208 }
209
210 if (_header != nullptr) {
211 os::free(_header);
212 }
213
214 if (_file_open) {
215 ::close(_fd);
216 }
217 }
218
219 void FileMapInfo::free_current_info() {
220 assert(CDSConfig::is_dumping_final_static_archive(), "only supported in this mode");
221 assert(_current_info != nullptr, "sanity");
222 delete _current_info;
223 assert(_current_info == nullptr, "sanity"); // Side effect expected from the above "delete" operator.
224 }
225
226 void FileMapInfo::populate_header(size_t core_region_alignment) {
227 assert(_header == nullptr, "Sanity check");
228 size_t c_header_size;
229 size_t header_size;
230 size_t base_archive_name_size = 0;
231 size_t base_archive_name_offset = 0;
232 if (is_static()) {
233 c_header_size = sizeof(FileMapHeader);
234 header_size = c_header_size;
235 } else {
236 // dynamic header including base archive name for non-default base archive
237 c_header_size = sizeof(DynamicArchiveHeader);
238 header_size = c_header_size;
239
240 const char* default_base_archive_name = CDSConfig::default_archive_path();
241 const char* current_base_archive_name = CDSConfig::input_static_archive_path();
242 if (!os::same_files(current_base_archive_name, default_base_archive_name)) {
243 base_archive_name_size = strlen(current_base_archive_name) + 1;
244 header_size += base_archive_name_size;
245 base_archive_name_offset = c_header_size;
246 }
247 }
248 _header = (FileMapHeader*)os::malloc(header_size, mtInternal);
249 memset((void*)_header, 0, header_size);
250 _header->populate(this,
251 core_region_alignment,
252 header_size,
253 base_archive_name_size,
254 base_archive_name_offset);
255 }
256
257 void FileMapHeader::populate(FileMapInfo *info, size_t core_region_alignment,
258 size_t header_size, size_t base_archive_name_size,
259 size_t base_archive_name_offset) {
260 // 1. We require _generic_header._magic to be at the beginning of the file
261 // 2. FileMapHeader also assumes that _generic_header is at the beginning of the file
262 assert(offset_of(FileMapHeader, _generic_header) == 0, "must be");
263 set_header_size((unsigned int)header_size);
264 set_base_archive_name_offset((unsigned int)base_archive_name_offset);
265 set_base_archive_name_size((unsigned int)base_archive_name_size);
266 if (CDSConfig::is_dumping_dynamic_archive()) {
267 set_magic(CDS_DYNAMIC_ARCHIVE_MAGIC);
268 } else if (CDSConfig::is_dumping_preimage_static_archive()) {
269 set_magic(CDS_PREIMAGE_ARCHIVE_MAGIC);
270 } else {
271 set_magic(CDS_ARCHIVE_MAGIC);
272 }
273 set_version(CURRENT_CDS_ARCHIVE_VERSION);
274
275 if (!info->is_static() && base_archive_name_size != 0) {
276 // copy base archive name
277 copy_base_archive_name(CDSConfig::input_static_archive_path());
278 }
279 _core_region_alignment = core_region_alignment;
280 _obj_alignment = ObjectAlignmentInBytes;
281 _compact_strings = CompactStrings;
282 _compact_headers = UseCompactObjectHeaders;
283 if (CDSConfig::is_dumping_heap()) {
284 _narrow_oop_mode = CompressedOops::mode();
285 _narrow_oop_base = CompressedOops::base();
286 _narrow_oop_shift = CompressedOops::shift();
287 }
288 _compressed_oops = UseCompressedOops;
289 _compressed_class_ptrs = UseCompressedClassPointers;
290 if (UseCompressedClassPointers) {
291 #ifdef _LP64
292 _narrow_klass_pointer_bits = CompressedKlassPointers::narrow_klass_pointer_bits();
293 _narrow_klass_shift = ArchiveBuilder::precomputed_narrow_klass_shift();
294 #endif
295 } else {
296 _narrow_klass_pointer_bits = _narrow_klass_shift = -1;
297 }
298 _max_heap_size = MaxHeapSize;
299 _use_optimized_module_handling = CDSConfig::is_using_optimized_module_handling();
300 _has_aot_linked_classes = CDSConfig::is_dumping_aot_linked_classes();
301 _has_full_module_graph = CDSConfig::is_dumping_full_module_graph();
302 _has_valhalla_patched_classes = CDSConfig::is_valhalla_preview();
303
304 // The following fields are for sanity checks for whether this archive
305 // will function correctly with this JVM and the bootclasspath it's
306 // invoked with.
307
308 // JVM version string ... changes on each build.
309 get_header_version(_jvm_ident);
310
311 _verify_local = BytecodeVerificationLocal;
312 _verify_remote = BytecodeVerificationRemote;
313 _has_platform_or_app_classes = AOTClassLocationConfig::dumptime()->has_platform_or_app_classes();
314 _requested_base_address = (char*)SharedBaseAddress;
315 _mapped_base_address = (char*)SharedBaseAddress;
316 _allow_archiving_with_java_agent = AllowArchivingWithJavaAgent;
317 _must_match.init();
318 }
319
320 void FileMapHeader::copy_base_archive_name(const char* archive) {
321 assert(base_archive_name_size() != 0, "_base_archive_name_size not set");
322 assert(base_archive_name_offset() != 0, "_base_archive_name_offset not set");
323 assert(header_size() > sizeof(*this), "_base_archive_name_size not included in header size?");
324 memcpy((char*)this + base_archive_name_offset(), archive, base_archive_name_size());
325 }
326
327 void FileMapHeader::print(outputStream* st) {
328 ResourceMark rm;
329
330 st->print_cr("- magic: 0x%08x", magic());
331 st->print_cr("- crc: 0x%08x", crc());
332 st->print_cr("- version: 0x%x", version());
333 st->print_cr("- header_size: " UINT32_FORMAT, header_size());
334 st->print_cr("- base_archive_name_offset: " UINT32_FORMAT, base_archive_name_offset());
335 st->print_cr("- base_archive_name_size: " UINT32_FORMAT, base_archive_name_size());
336
337 for (int i = 0; i < NUM_CDS_REGIONS; i++) {
338 FileMapRegion* r = region_at(i);
339 r->print(st, i);
340 }
341 st->print_cr("============ end regions ======== ");
342
343 st->print_cr("- core_region_alignment: %zu", _core_region_alignment);
344 st->print_cr("- obj_alignment: %d", _obj_alignment);
345 st->print_cr("- narrow_oop_base: " INTPTR_FORMAT, p2i(_narrow_oop_base));
346 st->print_cr("- narrow_oop_shift %d", _narrow_oop_shift);
347 st->print_cr("- compact_strings: %d", _compact_strings);
348 st->print_cr("- compact_headers: %d", _compact_headers);
349 st->print_cr("- max_heap_size: %zu", _max_heap_size);
350 st->print_cr("- narrow_oop_mode: %d", _narrow_oop_mode);
351 st->print_cr("- compressed_oops: %d", _compressed_oops);
352 st->print_cr("- compressed_class_ptrs: %d", _compressed_class_ptrs);
353 st->print_cr("- narrow_klass_pointer_bits: %d", _narrow_klass_pointer_bits);
354 st->print_cr("- narrow_klass_shift: %d", _narrow_klass_shift);
355 st->print_cr("- cloned_vtables_offset: 0x%zx", _cloned_vtables_offset);
356 st->print_cr("- early_serialized_data_offset: 0x%zx", _early_serialized_data_offset);
357 st->print_cr("- serialized_data_offset: 0x%zx", _serialized_data_offset);
358 st->print_cr("- jvm_ident: %s", _jvm_ident);
359 st->print_cr("- class_location_config_offset: 0x%zx", _class_location_config_offset);
360 st->print_cr("- verify_local: %d", _verify_local);
361 st->print_cr("- verify_remote: %d", _verify_remote);
362 st->print_cr("- has_platform_or_app_classes: %d", _has_platform_or_app_classes);
363 st->print_cr("- requested_base_address: " INTPTR_FORMAT, p2i(_requested_base_address));
364 st->print_cr("- mapped_base_address: " INTPTR_FORMAT, p2i(_mapped_base_address));
365 st->print_cr("- heap_root_segments.roots_count: %d" , _heap_root_segments.roots_count());
366 st->print_cr("- heap_root_segments.base_offset: 0x%zx", _heap_root_segments.base_offset());
367 st->print_cr("- heap_root_segments.count: %zu", _heap_root_segments.count());
368 st->print_cr("- heap_root_segments.max_size_elems: %d", _heap_root_segments.max_size_in_elems());
369 st->print_cr("- heap_root_segments.max_size_bytes: %d", _heap_root_segments.max_size_in_bytes());
370 st->print_cr("- _heap_oopmap_start_pos: %zu", _heap_oopmap_start_pos);
371 st->print_cr("- _heap_ptrmap_start_pos: %zu", _heap_ptrmap_start_pos);
372 st->print_cr("- _rw_ptrmap_start_pos: %zu", _rw_ptrmap_start_pos);
373 st->print_cr("- _ro_ptrmap_start_pos: %zu", _ro_ptrmap_start_pos);
374 st->print_cr("- allow_archiving_with_java_agent:%d", _allow_archiving_with_java_agent);
375 st->print_cr("- use_optimized_module_handling: %d", _use_optimized_module_handling);
376 st->print_cr("- has_full_module_graph %d", _has_full_module_graph);
377 st->print_cr("- has_valhalla_patched_classes %d", _has_valhalla_patched_classes);
378 _must_match.print(st);
379 st->print_cr("- has_aot_linked_classes %d", _has_aot_linked_classes);
380 }
381
382 bool FileMapInfo::validate_class_location() {
383 assert(CDSConfig::is_using_archive(), "runtime only");
384
385 AOTClassLocationConfig* config = header()->class_location_config();
386 bool has_extra_module_paths = false;
387 if (!config->validate(header()->has_aot_linked_classes(), &has_extra_module_paths)) {
388 if (PrintSharedArchiveAndExit) {
389 MetaspaceShared::set_archive_loading_failed();
390 return true;
391 } else {
392 return false;
393 }
394 }
395
396 if (header()->has_full_module_graph() && has_extra_module_paths) {
397 CDSConfig::stop_using_optimized_module_handling();
398 log_info(cds)("optimized module handling: disabled because extra module path(s) are specified");
399 }
400
401 if (CDSConfig::is_dumping_dynamic_archive()) {
402 // Only support dynamic dumping with the usage of the default CDS archive
403 // or a simple base archive.
404 // If the base layer archive contains additional path component besides
405 // the runtime image and the -cp, dynamic dumping is disabled.
406 if (config->num_boot_classpaths() > 0) {
407 CDSConfig::disable_dumping_dynamic_archive();
408 log_warning(cds)(
409 "Dynamic archiving is disabled because base layer archive has appended boot classpath");
410 }
411 if (config->num_module_paths() > 0) {
412 if (has_extra_module_paths) {
413 CDSConfig::disable_dumping_dynamic_archive();
414 log_warning(cds)(
415 "Dynamic archiving is disabled because base layer archive has a different module path");
416 }
417 }
418 }
419
420 #if INCLUDE_JVMTI
421 if (_classpath_entries_for_jvmti != nullptr) {
422 os::free(_classpath_entries_for_jvmti);
423 }
424 size_t sz = sizeof(ClassPathEntry*) * AOTClassLocationConfig::runtime()->length();
425 _classpath_entries_for_jvmti = (ClassPathEntry**)os::malloc(sz, mtClass);
426 memset((void*)_classpath_entries_for_jvmti, 0, sz);
427 #endif
428
429 return true;
430 }
431
432 // A utility class for reading/validating the GenericCDSFileMapHeader portion of
433 // a CDS archive's header. The file header of all CDS archives with versions from
434 // CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION (12) are guaranteed to always start
435 // with GenericCDSFileMapHeader. This makes it possible to read important information
436 // from a CDS archive created by a different version of HotSpot, so that we can
437 // automatically regenerate the archive as necessary (JDK-8261455).
438 class FileHeaderHelper {
439 int _fd;
440 bool _is_valid;
441 bool _is_static;
442 GenericCDSFileMapHeader* _header;
443 const char* _archive_name;
444 const char* _base_archive_name;
445
446 public:
447 FileHeaderHelper(const char* archive_name, bool is_static) {
448 _fd = -1;
449 _is_valid = false;
450 _header = nullptr;
451 _base_archive_name = nullptr;
452 _archive_name = archive_name;
453 _is_static = is_static;
454 }
455
456 ~FileHeaderHelper() {
457 if (_header != nullptr) {
458 FREE_C_HEAP_ARRAY(char, _header);
459 }
460 if (_fd != -1) {
461 ::close(_fd);
462 }
463 }
464
465 bool initialize() {
466 assert(_archive_name != nullptr, "Archive name is null");
467 _fd = os::open(_archive_name, O_RDONLY | O_BINARY, 0);
468 if (_fd < 0) {
469 log_info(cds)("Specified %s not found (%s)", CDSConfig::type_of_archive_being_loaded(), _archive_name);
470 return false;
471 }
472 return initialize(_fd);
473 }
474
475 // for an already opened file, do not set _fd
476 bool initialize(int fd) {
477 assert(_archive_name != nullptr, "Archive name is null");
478 assert(fd != -1, "Archive must be opened already");
479 // First read the generic header so we know the exact size of the actual header.
480 const char* file_type = CDSConfig::type_of_archive_being_loaded();
481 GenericCDSFileMapHeader gen_header;
482 size_t size = sizeof(GenericCDSFileMapHeader);
483 os::lseek(fd, 0, SEEK_SET);
484 size_t n = ::read(fd, (void*)&gen_header, (unsigned int)size);
485 if (n != size) {
486 log_warning(cds)("Unable to read generic CDS file map header from %s", file_type);
487 return false;
488 }
489
490 if (gen_header._magic != CDS_ARCHIVE_MAGIC &&
491 gen_header._magic != CDS_DYNAMIC_ARCHIVE_MAGIC &&
492 gen_header._magic != CDS_PREIMAGE_ARCHIVE_MAGIC) {
493 log_warning(cds)("The %s has a bad magic number: %#x", file_type, gen_header._magic);
494 return false;
495 }
496
497 if (gen_header._version < CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION) {
498 log_warning(cds)("Cannot handle %s version 0x%x. Must be at least 0x%x.",
499 file_type, gen_header._version, CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION);
500 return false;
501 }
502
503 if (gen_header._version != CURRENT_CDS_ARCHIVE_VERSION) {
504 log_warning(cds)("The %s version 0x%x does not match the required version 0x%x.",
505 file_type, gen_header._version, CURRENT_CDS_ARCHIVE_VERSION);
506 }
507
508 size_t filelen = os::lseek(fd, 0, SEEK_END);
509 if (gen_header._header_size >= filelen) {
510 log_warning(cds)("Archive file header larger than archive file");
511 return false;
512 }
513
514 // Read the actual header and perform more checks
515 size = gen_header._header_size;
516 _header = (GenericCDSFileMapHeader*)NEW_C_HEAP_ARRAY(char, size, mtInternal);
517 os::lseek(fd, 0, SEEK_SET);
518 n = ::read(fd, (void*)_header, (unsigned int)size);
519 if (n != size) {
520 log_warning(cds)("Unable to read file map header from %s", file_type);
521 return false;
522 }
523
524 if (!check_header_crc()) {
525 return false;
526 }
527
528 if (!check_and_init_base_archive_name()) {
529 return false;
530 }
531
532 // All fields in the GenericCDSFileMapHeader has been validated.
533 _is_valid = true;
534 return true;
535 }
536
537 GenericCDSFileMapHeader* get_generic_file_header() {
538 assert(_header != nullptr && _is_valid, "must be a valid archive file");
539 return _header;
540 }
541
542 const char* base_archive_name() {
543 assert(_header != nullptr && _is_valid, "must be a valid archive file");
544 return _base_archive_name;
545 }
546
547 bool is_static_archive() const {
548 return _header->_magic == CDS_ARCHIVE_MAGIC;
549 }
550
551 bool is_dynamic_archive() const {
552 return _header->_magic == CDS_DYNAMIC_ARCHIVE_MAGIC;
553 }
554
555 bool is_preimage_static_archive() const {
556 return _header->_magic == CDS_PREIMAGE_ARCHIVE_MAGIC;
557 }
558
559 private:
560 bool check_header_crc() const {
561 if (VerifySharedSpaces) {
562 FileMapHeader* header = (FileMapHeader*)_header;
563 int actual_crc = header->compute_crc();
564 if (actual_crc != header->crc()) {
565 log_info(cds)("_crc expected: %d", header->crc());
566 log_info(cds)(" actual: %d", actual_crc);
567 log_warning(cds)("Header checksum verification failed.");
568 return false;
569 }
570 }
571 return true;
572 }
573
574 bool check_and_init_base_archive_name() {
575 unsigned int name_offset = _header->_base_archive_name_offset;
576 unsigned int name_size = _header->_base_archive_name_size;
577 unsigned int header_size = _header->_header_size;
578
579 if (name_offset + name_size < name_offset) {
580 log_warning(cds)("base_archive_name offset/size overflow: " UINT32_FORMAT "/" UINT32_FORMAT,
581 name_offset, name_size);
582 return false;
583 }
584
585 if (is_static_archive() || is_preimage_static_archive()) {
586 if (name_offset != 0) {
587 log_warning(cds)("static shared archive must have zero _base_archive_name_offset");
588 return false;
589 }
590 if (name_size != 0) {
591 log_warning(cds)("static shared archive must have zero _base_archive_name_size");
592 return false;
593 }
594 } else {
595 assert(is_dynamic_archive(), "must be");
596 if ((name_size == 0 && name_offset != 0) ||
597 (name_size != 0 && name_offset == 0)) {
598 // If either is zero, both must be zero. This indicates that we are using the default base archive.
599 log_warning(cds)("Invalid base_archive_name offset/size: " UINT32_FORMAT "/" UINT32_FORMAT,
600 name_offset, name_size);
601 return false;
602 }
603 if (name_size > 0) {
604 if (name_offset + name_size > header_size) {
605 log_warning(cds)("Invalid base_archive_name offset/size (out of range): "
606 UINT32_FORMAT " + " UINT32_FORMAT " > " UINT32_FORMAT ,
607 name_offset, name_size, header_size);
608 return false;
609 }
610 const char* name = ((const char*)_header) + _header->_base_archive_name_offset;
611 if (name[name_size - 1] != '\0' || strlen(name) != name_size - 1) {
612 log_warning(cds)("Base archive name is damaged");
613 return false;
614 }
615 if (!os::file_exists(name)) {
616 log_warning(cds)("Base archive %s does not exist", name);
617 return false;
618 }
619 _base_archive_name = name;
620 }
621 }
622
623 return true;
624 }
625 };
626
627 // Return value:
628 // false:
629 // <archive_name> is not a valid archive. *base_archive_name is set to null.
630 // true && (*base_archive_name) == nullptr:
631 // <archive_name> is a valid static archive.
632 // true && (*base_archive_name) != nullptr:
633 // <archive_name> is a valid dynamic archive.
634 bool FileMapInfo::get_base_archive_name_from_header(const char* archive_name,
635 const char** base_archive_name) {
636 FileHeaderHelper file_helper(archive_name, false);
637 *base_archive_name = nullptr;
638
639 if (!file_helper.initialize()) {
640 return false;
641 }
642 GenericCDSFileMapHeader* header = file_helper.get_generic_file_header();
643 switch (header->_magic) {
644 case CDS_PREIMAGE_ARCHIVE_MAGIC:
645 return false; // This is a binary config file, not a proper archive
646 case CDS_DYNAMIC_ARCHIVE_MAGIC:
647 break;
648 default:
649 assert(header->_magic == CDS_ARCHIVE_MAGIC, "must be");
650 if (AutoCreateSharedArchive) {
651 log_warning(cds)("AutoCreateSharedArchive is ignored because %s is a static archive", archive_name);
652 }
653 return true;
654 }
655
656 const char* base = file_helper.base_archive_name();
657 if (base == nullptr) {
658 *base_archive_name = CDSConfig::default_archive_path();
659 } else {
660 *base_archive_name = os::strdup_check_oom(base);
661 }
662
663 return true;
664 }
665
666 bool FileMapInfo::is_preimage_static_archive(const char* file) {
667 FileHeaderHelper file_helper(file, false);
668 if (!file_helper.initialize()) {
669 return false;
670 }
671 return file_helper.is_preimage_static_archive();
672 }
673
674 // Read the FileMapInfo information from the file.
675
676 bool FileMapInfo::init_from_file(int fd) {
677 FileHeaderHelper file_helper(_full_path, _is_static);
678 if (!file_helper.initialize(fd)) {
679 log_warning(cds)("Unable to read the file header.");
680 return false;
681 }
682 GenericCDSFileMapHeader* gen_header = file_helper.get_generic_file_header();
683
684 const char* file_type = CDSConfig::type_of_archive_being_loaded();
685 if (_is_static) {
686 if ((gen_header->_magic == CDS_ARCHIVE_MAGIC) ||
687 (gen_header->_magic == CDS_PREIMAGE_ARCHIVE_MAGIC && CDSConfig::is_dumping_final_static_archive())) {
688 // Good
689 } else {
690 if (CDSConfig::new_aot_flags_used()) {
691 log_warning(cds)("Not a valid %s (%s)", file_type, _full_path);
692 } else {
693 log_warning(cds)("Not a base shared archive: %s", _full_path);
694 }
695 return false;
696 }
697 } else {
698 if (gen_header->_magic != CDS_DYNAMIC_ARCHIVE_MAGIC) {
699 log_warning(cds)("Not a top shared archive: %s", _full_path);
700 return false;
701 }
702 }
703
704 _header = (FileMapHeader*)os::malloc(gen_header->_header_size, mtInternal);
705 os::lseek(fd, 0, SEEK_SET); // reset to begin of the archive
706 size_t size = gen_header->_header_size;
707 size_t n = ::read(fd, (void*)_header, (unsigned int)size);
708 if (n != size) {
709 log_warning(cds)("Failed to read file header from the top archive file\n");
710 return false;
711 }
712
713 if (header()->version() != CURRENT_CDS_ARCHIVE_VERSION) {
714 log_info(cds)("_version expected: 0x%x", CURRENT_CDS_ARCHIVE_VERSION);
715 log_info(cds)(" actual: 0x%x", header()->version());
716 log_warning(cds)("The %s has the wrong version.", file_type);
717 return false;
718 }
719
720 unsigned int base_offset = header()->base_archive_name_offset();
721 unsigned int name_size = header()->base_archive_name_size();
722 unsigned int header_size = header()->header_size();
723 if (base_offset != 0 && name_size != 0) {
724 if (header_size != base_offset + name_size) {
725 log_info(cds)("_header_size: " UINT32_FORMAT, header_size);
726 log_info(cds)("base_archive_name_size: " UINT32_FORMAT, header()->base_archive_name_size());
727 log_info(cds)("base_archive_name_offset: " UINT32_FORMAT, header()->base_archive_name_offset());
728 log_warning(cds)("The %s has an incorrect header size.", file_type);
729 return false;
730 }
731 }
732
733 const char* actual_ident = header()->jvm_ident();
734
735 if (actual_ident[JVM_IDENT_MAX-1] != 0) {
736 log_warning(cds)("JVM version identifier is corrupted.");
737 return false;
738 }
739
740 char expected_ident[JVM_IDENT_MAX];
741 get_header_version(expected_ident);
742 if (strncmp(actual_ident, expected_ident, JVM_IDENT_MAX-1) != 0) {
743 log_info(cds)("_jvm_ident expected: %s", expected_ident);
744 log_info(cds)(" actual: %s", actual_ident);
745 log_warning(cds)("The %s was created by a different"
746 " version or build of HotSpot", file_type);
747 return false;
748 }
749
750 _file_offset = header()->header_size(); // accounts for the size of _base_archive_name
751
752 size_t len = os::lseek(fd, 0, SEEK_END);
753
754 for (int i = 0; i < MetaspaceShared::n_regions; i++) {
755 FileMapRegion* r = region_at(i);
756 if (r->file_offset() > len || len - r->file_offset() < r->used()) {
757 log_warning(cds)("The %s has been truncated.", file_type);
758 return false;
759 }
760 }
761
762 if (!header()->check_must_match_flags()) {
763 return false;
764 }
765
766 return true;
767 }
768
769 void FileMapInfo::seek_to_position(size_t pos) {
770 if (os::lseek(_fd, (long)pos, SEEK_SET) < 0) {
771 log_error(cds)("Unable to seek to position %zu", pos);
772 MetaspaceShared::unrecoverable_loading_error();
773 }
774 }
775
776 // Read the FileMapInfo information from the file.
777 bool FileMapInfo::open_for_read() {
778 if (_file_open) {
779 return true;
780 }
781 const char* file_type = CDSConfig::type_of_archive_being_loaded();
782 const char* info = CDSConfig::is_dumping_final_static_archive() ?
783 "AOTConfiguration file " : "";
784 log_info(cds)("trying to map %s%s", info, _full_path);
785 int fd = os::open(_full_path, O_RDONLY | O_BINARY, 0);
786 if (fd < 0) {
787 if (errno == ENOENT) {
788 log_info(cds)("Specified %s not found (%s)", file_type, _full_path);
789 } else {
790 log_warning(cds)("Failed to open %s (%s)", file_type,
791 os::strerror(errno));
792 }
793 return false;
794 } else {
795 log_info(cds)("Opened %s %s.", file_type, _full_path);
796 }
797
798 _fd = fd;
799 _file_open = true;
800 return true;
801 }
802
803 // Write the FileMapInfo information to the file.
804
805 void FileMapInfo::open_as_output() {
806 LogMessage(cds) msg;
807 if (msg.is_info()) {
808 if (CDSConfig::is_dumping_preimage_static_archive()) {
809 msg.info("Writing binary AOTConfiguration file: ");
810 } else {
811 msg.info("Dumping shared data to file: ");
812 }
813 msg.info(" %s", _full_path);
814 }
815
816 #ifdef _WINDOWS // On Windows, need WRITE permission to remove the file.
817 chmod(_full_path, _S_IREAD | _S_IWRITE);
818 #endif
819
820 // Use remove() to delete the existing file because, on Unix, this will
821 // allow processes that have it open continued access to the file.
822 remove(_full_path);
823 int mode = CDSConfig::is_dumping_preimage_static_archive() ? 0666 : 0444;
824 int fd = os::open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, mode);
825 if (fd < 0) {
826 log_error(cds)("Unable to create %s %s: (%s).", CDSConfig::type_of_archive_being_written(), _full_path,
827 os::strerror(errno));
828 MetaspaceShared::writing_error();
829 return;
830 }
831 _fd = fd;
832 _file_open = true;
833
834 // Seek past the header. We will write the header after all regions are written
835 // and their CRCs computed.
836 size_t header_bytes = header()->header_size();
837
838 header_bytes = align_up(header_bytes, MetaspaceShared::core_region_alignment());
839 _file_offset = header_bytes;
840 seek_to_position(_file_offset);
841 }
842
843 // Write the header to the file, seek to the next allocation boundary.
844
845 void FileMapInfo::write_header() {
846 _file_offset = 0;
847 seek_to_position(_file_offset);
848 assert(is_file_position_aligned(), "must be");
849 write_bytes(header(), header()->header_size());
850 }
851
852 size_t FileMapRegion::used_aligned() const {
853 return align_up(used(), MetaspaceShared::core_region_alignment());
854 }
855
856 void FileMapRegion::init(int region_index, size_t mapping_offset, size_t size, bool read_only,
857 bool allow_exec, int crc) {
858 _is_heap_region = HeapShared::is_heap_region(region_index);
859 _is_bitmap_region = (region_index == MetaspaceShared::bm);
860 _mapping_offset = mapping_offset;
861 _used = size;
862 _read_only = read_only;
863 _allow_exec = allow_exec;
864 _crc = crc;
865 _mapped_from_file = false;
866 _mapped_base = nullptr;
867 _in_reserved_space = false;
868 }
869
870 void FileMapRegion::init_oopmap(size_t offset, size_t size_in_bits) {
871 _oopmap_offset = offset;
872 _oopmap_size_in_bits = size_in_bits;
873 }
874
875 void FileMapRegion::init_ptrmap(size_t offset, size_t size_in_bits) {
876 _ptrmap_offset = offset;
877 _ptrmap_size_in_bits = size_in_bits;
878 }
879
880 bool FileMapRegion::check_region_crc(char* base) const {
881 // This function should be called after the region has been properly
882 // loaded into memory via FileMapInfo::map_region() or FileMapInfo::read_region().
883 // I.e., this->mapped_base() must be valid.
884 size_t sz = used();
885 if (sz == 0) {
886 return true;
887 }
888
889 assert(base != nullptr, "must be initialized");
890 int crc = ClassLoader::crc32(0, base, (jint)sz);
891 if (crc != this->crc()) {
892 log_warning(cds)("Checksum verification failed.");
893 return false;
894 }
895 return true;
896 }
897
898 static const char* region_name(int region_index) {
899 static const char* names[] = {
900 "rw", "ro", "bm", "hp"
901 };
902 const int num_regions = sizeof(names)/sizeof(names[0]);
903 assert(0 <= region_index && region_index < num_regions, "sanity");
904
905 return names[region_index];
906 }
907
908 BitMapView FileMapInfo::bitmap_view(int region_index, bool is_oopmap) {
909 FileMapRegion* r = region_at(region_index);
910 char* bitmap_base = is_static() ? FileMapInfo::current_info()->map_bitmap_region() : FileMapInfo::dynamic_info()->map_bitmap_region();
911 bitmap_base += is_oopmap ? r->oopmap_offset() : r->ptrmap_offset();
912 size_t size_in_bits = is_oopmap ? r->oopmap_size_in_bits() : r->ptrmap_size_in_bits();
913
914 log_debug(cds, reloc)("mapped %s relocation %smap @ " INTPTR_FORMAT " (%zu bits)",
915 region_name(region_index), is_oopmap ? "oop" : "ptr",
916 p2i(bitmap_base), size_in_bits);
917
918 return BitMapView((BitMap::bm_word_t*)(bitmap_base), size_in_bits);
919 }
920
921 BitMapView FileMapInfo::oopmap_view(int region_index) {
922 return bitmap_view(region_index, /*is_oopmap*/true);
923 }
924
925 BitMapView FileMapInfo::ptrmap_view(int region_index) {
926 return bitmap_view(region_index, /*is_oopmap*/false);
927 }
928
929 void FileMapRegion::print(outputStream* st, int region_index) {
930 st->print_cr("============ region ============= %d \"%s\"", region_index, region_name(region_index));
931 st->print_cr("- crc: 0x%08x", _crc);
932 st->print_cr("- read_only: %d", _read_only);
933 st->print_cr("- allow_exec: %d", _allow_exec);
934 st->print_cr("- is_heap_region: %d", _is_heap_region);
935 st->print_cr("- is_bitmap_region: %d", _is_bitmap_region);
936 st->print_cr("- mapped_from_file: %d", _mapped_from_file);
937 st->print_cr("- file_offset: 0x%zx", _file_offset);
938 st->print_cr("- mapping_offset: 0x%zx", _mapping_offset);
939 st->print_cr("- used: %zu", _used);
940 st->print_cr("- oopmap_offset: 0x%zx", _oopmap_offset);
941 st->print_cr("- oopmap_size_in_bits: %zu", _oopmap_size_in_bits);
942 st->print_cr("- ptrmap_offset: 0x%zx", _ptrmap_offset);
943 st->print_cr("- ptrmap_size_in_bits: %zu", _ptrmap_size_in_bits);
944 st->print_cr("- mapped_base: " INTPTR_FORMAT, p2i(_mapped_base));
945 }
946
947 void FileMapInfo::write_region(int region, char* base, size_t size,
948 bool read_only, bool allow_exec) {
949 assert(CDSConfig::is_dumping_archive(), "sanity");
950
951 FileMapRegion* r = region_at(region);
952 char* requested_base;
953 size_t mapping_offset = 0;
954
955 if (region == MetaspaceShared::bm) {
956 requested_base = nullptr; // always null for bm region
957 } else if (size == 0) {
958 // This is an unused region (e.g., a heap region when !INCLUDE_CDS_JAVA_HEAP)
959 requested_base = nullptr;
960 } else if (HeapShared::is_heap_region(region)) {
961 assert(CDSConfig::is_dumping_heap(), "sanity");
962 #if INCLUDE_CDS_JAVA_HEAP
963 assert(!CDSConfig::is_dumping_dynamic_archive(), "must be");
964 requested_base = (char*)ArchiveHeapWriter::requested_address();
965 if (UseCompressedOops) {
966 mapping_offset = (size_t)((address)requested_base - CompressedOops::base());
967 assert((mapping_offset >> CompressedOops::shift()) << CompressedOops::shift() == mapping_offset, "must be");
968 } else {
969 mapping_offset = 0; // not used with !UseCompressedOops
970 }
971 #endif // INCLUDE_CDS_JAVA_HEAP
972 } else {
973 char* requested_SharedBaseAddress = (char*)MetaspaceShared::requested_base_address();
974 requested_base = ArchiveBuilder::current()->to_requested(base);
975 assert(requested_base >= requested_SharedBaseAddress, "must be");
976 mapping_offset = requested_base - requested_SharedBaseAddress;
977 }
978
979 r->set_file_offset(_file_offset);
980 int crc = ClassLoader::crc32(0, base, (jint)size);
981 if (size > 0) {
982 log_info(cds)("Shared file region (%s) %d: %8zu"
983 " bytes, addr " INTPTR_FORMAT " file offset 0x%08" PRIxPTR
984 " crc 0x%08x",
985 region_name(region), region, size, p2i(requested_base), _file_offset, crc);
986 }
987
988 r->init(region, mapping_offset, size, read_only, allow_exec, crc);
989
990 if (base != nullptr) {
991 write_bytes_aligned(base, size);
992 }
993 }
994
995 static size_t write_bitmap(const CHeapBitMap* map, char* output, size_t offset) {
996 size_t size_in_bytes = map->size_in_bytes();
997 map->write_to((BitMap::bm_word_t*)(output + offset), size_in_bytes);
998 return offset + size_in_bytes;
999 }
1000
1001 // The sorting code groups the objects with non-null oop/ptrs together.
1002 // Relevant bitmaps then have lots of leading and trailing zeros, which
1003 // we do not have to store.
1004 size_t FileMapInfo::remove_bitmap_zeros(CHeapBitMap* map) {
1005 BitMap::idx_t first_set = map->find_first_set_bit(0);
1006 BitMap::idx_t last_set = map->find_last_set_bit(0);
1007 size_t old_size = map->size();
1008
1009 // Slice and resize bitmap
1010 map->truncate(first_set, last_set + 1);
1011
1012 assert(map->at(0), "First bit should be set");
1013 assert(map->at(map->size() - 1), "Last bit should be set");
1014 assert(map->size() <= old_size, "sanity");
1015
1016 return first_set;
1017 }
1018
1019 char* FileMapInfo::write_bitmap_region(CHeapBitMap* rw_ptrmap, CHeapBitMap* ro_ptrmap, ArchiveHeapInfo* heap_info,
1020 size_t &size_in_bytes) {
1021 size_t removed_rw_leading_zeros = remove_bitmap_zeros(rw_ptrmap);
1022 size_t removed_ro_leading_zeros = remove_bitmap_zeros(ro_ptrmap);
1023 header()->set_rw_ptrmap_start_pos(removed_rw_leading_zeros);
1024 header()->set_ro_ptrmap_start_pos(removed_ro_leading_zeros);
1025 size_in_bytes = rw_ptrmap->size_in_bytes() + ro_ptrmap->size_in_bytes();
1026
1027 if (heap_info->is_used()) {
1028 // Remove leading and trailing zeros
1029 size_t removed_oop_leading_zeros = remove_bitmap_zeros(heap_info->oopmap());
1030 size_t removed_ptr_leading_zeros = remove_bitmap_zeros(heap_info->ptrmap());
1031 header()->set_heap_oopmap_start_pos(removed_oop_leading_zeros);
1032 header()->set_heap_ptrmap_start_pos(removed_ptr_leading_zeros);
1033
1034 size_in_bytes += heap_info->oopmap()->size_in_bytes();
1035 size_in_bytes += heap_info->ptrmap()->size_in_bytes();
1036 }
1037
1038 // The bitmap region contains up to 4 parts:
1039 // rw_ptrmap: metaspace pointers inside the read-write region
1040 // ro_ptrmap: metaspace pointers inside the read-only region
1041 // heap_info->oopmap(): Java oop pointers in the heap region
1042 // heap_info->ptrmap(): metaspace pointers in the heap region
1043 char* buffer = NEW_C_HEAP_ARRAY(char, size_in_bytes, mtClassShared);
1044 size_t written = 0;
1045
1046 region_at(MetaspaceShared::rw)->init_ptrmap(0, rw_ptrmap->size());
1047 written = write_bitmap(rw_ptrmap, buffer, written);
1048
1049 region_at(MetaspaceShared::ro)->init_ptrmap(written, ro_ptrmap->size());
1050 written = write_bitmap(ro_ptrmap, buffer, written);
1051
1052 if (heap_info->is_used()) {
1053 FileMapRegion* r = region_at(MetaspaceShared::hp);
1054
1055 r->init_oopmap(written, heap_info->oopmap()->size());
1056 written = write_bitmap(heap_info->oopmap(), buffer, written);
1057
1058 r->init_ptrmap(written, heap_info->ptrmap()->size());
1059 written = write_bitmap(heap_info->ptrmap(), buffer, written);
1060 }
1061
1062 write_region(MetaspaceShared::bm, (char*)buffer, size_in_bytes, /*read_only=*/true, /*allow_exec=*/false);
1063 return buffer;
1064 }
1065
1066 size_t FileMapInfo::write_heap_region(ArchiveHeapInfo* heap_info) {
1067 char* buffer_start = heap_info->buffer_start();
1068 size_t buffer_size = heap_info->buffer_byte_size();
1069 write_region(MetaspaceShared::hp, buffer_start, buffer_size, false, false);
1070 header()->set_heap_root_segments(heap_info->heap_root_segments());
1071 return buffer_size;
1072 }
1073
1074 // Dump bytes to file -- at the current file position.
1075
1076 void FileMapInfo::write_bytes(const void* buffer, size_t nbytes) {
1077 assert(_file_open, "must be");
1078 if (!os::write(_fd, buffer, nbytes)) {
1079 // If the shared archive is corrupted, close it and remove it.
1080 close();
1081 remove(_full_path);
1082
1083 if (CDSConfig::is_dumping_preimage_static_archive()) {
1084 MetaspaceShared::writing_error("Unable to write to AOT configuration file.");
1085 } else if (CDSConfig::new_aot_flags_used()) {
1086 MetaspaceShared::writing_error("Unable to write to AOT cache.");
1087 } else {
1088 MetaspaceShared::writing_error("Unable to write to shared archive.");
1089 }
1090 }
1091 _file_offset += nbytes;
1092 }
1093
1094 bool FileMapInfo::is_file_position_aligned() const {
1095 return _file_offset == align_up(_file_offset,
1096 MetaspaceShared::core_region_alignment());
1097 }
1098
1099 // Align file position to an allocation unit boundary.
1100
1101 void FileMapInfo::align_file_position() {
1102 assert(_file_open, "must be");
1103 size_t new_file_offset = align_up(_file_offset,
1104 MetaspaceShared::core_region_alignment());
1105 if (new_file_offset != _file_offset) {
1106 _file_offset = new_file_offset;
1107 // Seek one byte back from the target and write a byte to insure
1108 // that the written file is the correct length.
1109 _file_offset -= 1;
1110 seek_to_position(_file_offset);
1111 char zero = 0;
1112 write_bytes(&zero, 1);
1113 }
1114 }
1115
1116
1117 // Dump bytes to file -- at the current file position.
1118
1119 void FileMapInfo::write_bytes_aligned(const void* buffer, size_t nbytes) {
1120 align_file_position();
1121 write_bytes(buffer, nbytes);
1122 align_file_position();
1123 }
1124
1125 // Close the shared archive file. This does NOT unmap mapped regions.
1126
1127 void FileMapInfo::close() {
1128 if (_file_open) {
1129 if (::close(_fd) < 0) {
1130 MetaspaceShared::unrecoverable_loading_error("Unable to close the shared archive file.");
1131 }
1132 _file_open = false;
1133 _fd = -1;
1134 }
1135 }
1136
1137 /*
1138 * Same as os::map_memory() but also pretouches if AlwaysPreTouch is enabled.
1139 */
1140 static char* map_memory(int fd, const char* file_name, size_t file_offset,
1141 char *addr, size_t bytes, bool read_only,
1142 bool allow_exec, MemTag mem_tag) {
1143 char* mem = os::map_memory(fd, file_name, file_offset, addr, bytes,
1144 mem_tag, AlwaysPreTouch ? false : read_only,
1145 allow_exec);
1146 if (mem != nullptr && AlwaysPreTouch) {
1147 os::pretouch_memory(mem, mem + bytes);
1148 }
1149 return mem;
1150 }
1151
1152 // JVM/TI RedefineClasses() support:
1153 // Remap the shared readonly space to shared readwrite, private.
1154 bool FileMapInfo::remap_shared_readonly_as_readwrite() {
1155 int idx = MetaspaceShared::ro;
1156 FileMapRegion* r = region_at(idx);
1157 if (!r->read_only()) {
1158 // the space is already readwrite so we are done
1159 return true;
1160 }
1161 size_t size = r->used_aligned();
1162 if (!open_for_read()) {
1163 return false;
1164 }
1165 char *addr = r->mapped_base();
1166 // This path should not be reached for Windows; see JDK-8222379.
1167 assert(WINDOWS_ONLY(false) NOT_WINDOWS(true), "Don't call on Windows");
1168 // Replace old mapping with new one that is writable.
1169 char *base = os::map_memory(_fd, _full_path, r->file_offset(),
1170 addr, size, mtNone, false /* !read_only */,
1171 r->allow_exec());
1172 close();
1173 // These have to be errors because the shared region is now unmapped.
1174 if (base == nullptr) {
1175 log_error(cds)("Unable to remap shared readonly space (errno=%d).", errno);
1176 vm_exit(1);
1177 }
1178 if (base != addr) {
1179 log_error(cds)("Unable to remap shared readonly space (errno=%d).", errno);
1180 vm_exit(1);
1181 }
1182 r->set_read_only(false);
1183 return true;
1184 }
1185
1186 // Memory map a region in the address space.
1187 static const char* shared_region_name[] = { "ReadWrite", "ReadOnly", "Bitmap", "Heap" };
1188
1189 MapArchiveResult FileMapInfo::map_regions(int regions[], int num_regions, char* mapped_base_address, ReservedSpace rs) {
1190 DEBUG_ONLY(FileMapRegion* last_region = nullptr);
1191 intx addr_delta = mapped_base_address - header()->requested_base_address();
1192
1193 // Make sure we don't attempt to use header()->mapped_base_address() unless
1194 // it's been successfully mapped.
1195 DEBUG_ONLY(header()->set_mapped_base_address((char*)(uintptr_t)0xdeadbeef);)
1196
1197 for (int i = 0; i < num_regions; i++) {
1198 int idx = regions[i];
1199 MapArchiveResult result = map_region(idx, addr_delta, mapped_base_address, rs);
1200 if (result != MAP_ARCHIVE_SUCCESS) {
1201 return result;
1202 }
1203 FileMapRegion* r = region_at(idx);
1204 DEBUG_ONLY(if (last_region != nullptr) {
1205 // Ensure that the OS won't be able to allocate new memory spaces between any mapped
1206 // regions, or else it would mess up the simple comparison in MetaspaceObj::is_shared().
1207 assert(r->mapped_base() == last_region->mapped_end(), "must have no gaps");
1208 }
1209 last_region = r;)
1210 log_info(cds)("Mapped %s region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)", is_static() ? "static " : "dynamic",
1211 idx, p2i(r->mapped_base()), p2i(r->mapped_end()),
1212 shared_region_name[idx]);
1213
1214 }
1215
1216 header()->set_mapped_base_address(header()->requested_base_address() + addr_delta);
1217 if (addr_delta != 0 && !relocate_pointers_in_core_regions(addr_delta)) {
1218 return MAP_ARCHIVE_OTHER_FAILURE;
1219 }
1220
1221 return MAP_ARCHIVE_SUCCESS;
1222 }
1223
1224 bool FileMapInfo::read_region(int i, char* base, size_t size, bool do_commit) {
1225 FileMapRegion* r = region_at(i);
1226 if (do_commit) {
1227 log_info(cds)("Commit %s region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)%s",
1228 is_static() ? "static " : "dynamic", i, p2i(base), p2i(base + size),
1229 shared_region_name[i], r->allow_exec() ? " exec" : "");
1230 if (!os::commit_memory(base, size, r->allow_exec())) {
1231 log_error(cds)("Failed to commit %s region #%d (%s)", is_static() ? "static " : "dynamic",
1232 i, shared_region_name[i]);
1233 return false;
1234 }
1235 }
1236 if (os::lseek(_fd, (long)r->file_offset(), SEEK_SET) != (int)r->file_offset() ||
1237 read_bytes(base, size) != size) {
1238 return false;
1239 }
1240
1241 if (VerifySharedSpaces && !r->check_region_crc(base)) {
1242 return false;
1243 }
1244
1245 r->set_mapped_from_file(false);
1246 r->set_mapped_base(base);
1247
1248 return true;
1249 }
1250
1251 MapArchiveResult FileMapInfo::map_region(int i, intx addr_delta, char* mapped_base_address, ReservedSpace rs) {
1252 assert(!HeapShared::is_heap_region(i), "sanity");
1253 FileMapRegion* r = region_at(i);
1254 size_t size = r->used_aligned();
1255 char *requested_addr = mapped_base_address + r->mapping_offset();
1256 assert(!is_mapped(), "must be not mapped yet");
1257 assert(requested_addr != nullptr, "must be specified");
1258
1259 r->set_mapped_from_file(false);
1260 r->set_in_reserved_space(false);
1261
1262 if (MetaspaceShared::use_windows_memory_mapping()) {
1263 // Windows cannot remap read-only shared memory to read-write when required for
1264 // RedefineClasses, which is also used by JFR. Always map windows regions as RW.
1265 r->set_read_only(false);
1266 } else if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space() ||
1267 Arguments::has_jfr_option()) {
1268 // If a tool agent is in use (debugging enabled), or JFR, we must map the address space RW
1269 r->set_read_only(false);
1270 } else if (addr_delta != 0) {
1271 r->set_read_only(false); // Need to patch the pointers
1272 }
1273
1274 if (MetaspaceShared::use_windows_memory_mapping() && rs.is_reserved()) {
1275 // This is the second time we try to map the archive(s). We have already created a ReservedSpace
1276 // that covers all the FileMapRegions to ensure all regions can be mapped. However, Windows
1277 // can't mmap into a ReservedSpace, so we just ::read() the data. We're going to patch all the
1278 // regions anyway, so there's no benefit for mmap anyway.
1279 if (!read_region(i, requested_addr, size, /* do_commit = */ true)) {
1280 log_info(cds)("Failed to read %s shared space into reserved space at " INTPTR_FORMAT,
1281 shared_region_name[i], p2i(requested_addr));
1282 return MAP_ARCHIVE_OTHER_FAILURE; // oom or I/O error.
1283 } else {
1284 assert(r->mapped_base() != nullptr, "must be initialized");
1285 }
1286 } else {
1287 // Note that this may either be a "fresh" mapping into unreserved address
1288 // space (Windows, first mapping attempt), or a mapping into pre-reserved
1289 // space (Posix). See also comment in MetaspaceShared::map_archives().
1290 char* base = map_memory(_fd, _full_path, r->file_offset(),
1291 requested_addr, size, r->read_only(),
1292 r->allow_exec(), mtClassShared);
1293 if (base != requested_addr) {
1294 log_info(cds)("Unable to map %s shared space at " INTPTR_FORMAT,
1295 shared_region_name[i], p2i(requested_addr));
1296 _memory_mapping_failed = true;
1297 return MAP_ARCHIVE_MMAP_FAILURE;
1298 }
1299
1300 if (VerifySharedSpaces && !r->check_region_crc(requested_addr)) {
1301 return MAP_ARCHIVE_OTHER_FAILURE;
1302 }
1303
1304 r->set_mapped_from_file(true);
1305 r->set_mapped_base(requested_addr);
1306 }
1307
1308 if (rs.is_reserved()) {
1309 char* mapped_base = r->mapped_base();
1310 assert(rs.base() <= mapped_base && mapped_base + size <= rs.end(),
1311 PTR_FORMAT " <= " PTR_FORMAT " < " PTR_FORMAT " <= " PTR_FORMAT,
1312 p2i(rs.base()), p2i(mapped_base), p2i(mapped_base + size), p2i(rs.end()));
1313 r->set_in_reserved_space(rs.is_reserved());
1314 }
1315 return MAP_ARCHIVE_SUCCESS;
1316 }
1317
1318 // The return value is the location of the archive relocation bitmap.
1319 char* FileMapInfo::map_bitmap_region() {
1320 FileMapRegion* r = region_at(MetaspaceShared::bm);
1321 if (r->mapped_base() != nullptr) {
1322 return r->mapped_base();
1323 }
1324 bool read_only = true, allow_exec = false;
1325 char* requested_addr = nullptr; // allow OS to pick any location
1326 char* bitmap_base = map_memory(_fd, _full_path, r->file_offset(),
1327 requested_addr, r->used_aligned(), read_only, allow_exec, mtClassShared);
1328 if (bitmap_base == nullptr) {
1329 log_info(cds)("failed to map relocation bitmap");
1330 return nullptr;
1331 }
1332
1333 if (VerifySharedSpaces && !r->check_region_crc(bitmap_base)) {
1334 log_error(cds)("relocation bitmap CRC error");
1335 if (!os::unmap_memory(bitmap_base, r->used_aligned())) {
1336 fatal("os::unmap_memory of relocation bitmap failed");
1337 }
1338 return nullptr;
1339 }
1340
1341 r->set_mapped_from_file(true);
1342 r->set_mapped_base(bitmap_base);
1343 log_info(cds)("Mapped %s region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)",
1344 is_static() ? "static " : "dynamic",
1345 MetaspaceShared::bm, p2i(r->mapped_base()), p2i(r->mapped_end()),
1346 shared_region_name[MetaspaceShared::bm]);
1347 return bitmap_base;
1348 }
1349
1350 class SharedDataRelocationTask : public ArchiveWorkerTask {
1351 private:
1352 BitMapView* const _rw_bm;
1353 BitMapView* const _ro_bm;
1354 SharedDataRelocator* const _rw_reloc;
1355 SharedDataRelocator* const _ro_reloc;
1356
1357 public:
1358 SharedDataRelocationTask(BitMapView* rw_bm, BitMapView* ro_bm, SharedDataRelocator* rw_reloc, SharedDataRelocator* ro_reloc) :
1359 ArchiveWorkerTask("Shared Data Relocation"),
1360 _rw_bm(rw_bm), _ro_bm(ro_bm), _rw_reloc(rw_reloc), _ro_reloc(ro_reloc) {}
1361
1362 void work(int chunk, int max_chunks) override {
1363 work_on(chunk, max_chunks, _rw_bm, _rw_reloc);
1364 work_on(chunk, max_chunks, _ro_bm, _ro_reloc);
1365 }
1366
1367 void work_on(int chunk, int max_chunks, BitMapView* bm, SharedDataRelocator* reloc) {
1368 BitMap::idx_t size = bm->size();
1369 BitMap::idx_t start = MIN2(size, size * chunk / max_chunks);
1370 BitMap::idx_t end = MIN2(size, size * (chunk + 1) / max_chunks);
1371 assert(end > start, "Sanity: no empty slices");
1372 bm->iterate(reloc, start, end);
1373 }
1374 };
1375
1376 // This is called when we cannot map the archive at the requested[ base address (usually 0x800000000).
1377 // We relocate all pointers in the 2 core regions (ro, rw).
1378 bool FileMapInfo::relocate_pointers_in_core_regions(intx addr_delta) {
1379 log_debug(cds, reloc)("runtime archive relocation start");
1380 char* bitmap_base = map_bitmap_region();
1381
1382 if (bitmap_base == nullptr) {
1383 return false; // OOM, or CRC check failure
1384 } else {
1385 BitMapView rw_ptrmap = ptrmap_view(MetaspaceShared::rw);
1386 BitMapView ro_ptrmap = ptrmap_view(MetaspaceShared::ro);
1387
1388 FileMapRegion* rw_region = first_core_region();
1389 FileMapRegion* ro_region = last_core_region();
1390
1391 // Patch all pointers inside the RW region
1392 address rw_patch_base = (address)rw_region->mapped_base();
1393 address rw_patch_end = (address)rw_region->mapped_end();
1394
1395 // Patch all pointers inside the RO region
1396 address ro_patch_base = (address)ro_region->mapped_base();
1397 address ro_patch_end = (address)ro_region->mapped_end();
1398
1399 // the current value of the pointers to be patched must be within this
1400 // range (i.e., must be between the requested base address and the address of the current archive).
1401 // Note: top archive may point to objects in the base archive, but not the other way around.
1402 address valid_old_base = (address)header()->requested_base_address();
1403 address valid_old_end = valid_old_base + mapping_end_offset();
1404
1405 // after patching, the pointers must point inside this range
1406 // (the requested location of the archive, as mapped at runtime).
1407 address valid_new_base = (address)header()->mapped_base_address();
1408 address valid_new_end = (address)mapped_end();
1409
1410 SharedDataRelocator rw_patcher((address*)rw_patch_base + header()->rw_ptrmap_start_pos(), (address*)rw_patch_end, valid_old_base, valid_old_end,
1411 valid_new_base, valid_new_end, addr_delta);
1412 SharedDataRelocator ro_patcher((address*)ro_patch_base + header()->ro_ptrmap_start_pos(), (address*)ro_patch_end, valid_old_base, valid_old_end,
1413 valid_new_base, valid_new_end, addr_delta);
1414
1415 if (AOTCacheParallelRelocation) {
1416 ArchiveWorkers workers;
1417 SharedDataRelocationTask task(&rw_ptrmap, &ro_ptrmap, &rw_patcher, &ro_patcher);
1418 workers.run_task(&task);
1419 } else {
1420 rw_ptrmap.iterate(&rw_patcher);
1421 ro_ptrmap.iterate(&ro_patcher);
1422 }
1423
1424 // The MetaspaceShared::bm region will be unmapped in MetaspaceShared::initialize_shared_spaces().
1425
1426 log_debug(cds, reloc)("runtime archive relocation done");
1427 return true;
1428 }
1429 }
1430
1431 size_t FileMapInfo::read_bytes(void* buffer, size_t count) {
1432 assert(_file_open, "Archive file is not open");
1433 size_t n = ::read(_fd, buffer, (unsigned int)count);
1434 if (n != count) {
1435 // Close the file if there's a problem reading it.
1436 close();
1437 return 0;
1438 }
1439 _file_offset += count;
1440 return count;
1441 }
1442
1443 // Get the total size in bytes of a read only region
1444 size_t FileMapInfo::readonly_total() {
1445 size_t total = 0;
1446 if (current_info() != nullptr) {
1447 FileMapRegion* r = FileMapInfo::current_info()->region_at(MetaspaceShared::ro);
1448 if (r->read_only()) total += r->used();
1449 }
1450 if (dynamic_info() != nullptr) {
1451 FileMapRegion* r = FileMapInfo::dynamic_info()->region_at(MetaspaceShared::ro);
1452 if (r->read_only()) total += r->used();
1453 }
1454 return total;
1455 }
1456
1457 #if INCLUDE_CDS_JAVA_HEAP
1458 MemRegion FileMapInfo::_mapped_heap_memregion;
1459
1460 bool FileMapInfo::has_heap_region() {
1461 return (region_at(MetaspaceShared::hp)->used() > 0);
1462 }
1463
1464 // Returns the address range of the archived heap region computed using the
1465 // current oop encoding mode. This range may be different than the one seen at
1466 // dump time due to encoding mode differences. The result is used in determining
1467 // if/how these regions should be relocated at run time.
1468 MemRegion FileMapInfo::get_heap_region_requested_range() {
1469 FileMapRegion* r = region_at(MetaspaceShared::hp);
1470 size_t size = r->used();
1471 assert(size > 0, "must have non-empty heap region");
1472
1473 address start = heap_region_requested_address();
1474 address end = start + size;
1475 log_info(cds)("Requested heap region [" INTPTR_FORMAT " - " INTPTR_FORMAT "] = %8zu bytes",
1476 p2i(start), p2i(end), size);
1477
1478 return MemRegion((HeapWord*)start, (HeapWord*)end);
1479 }
1480
1481 void FileMapInfo::map_or_load_heap_region() {
1482 bool success = false;
1483
1484 if (can_use_heap_region()) {
1485 if (ArchiveHeapLoader::can_map()) {
1486 success = map_heap_region();
1487 } else if (ArchiveHeapLoader::can_load()) {
1488 success = ArchiveHeapLoader::load_heap_region(this);
1489 } else {
1490 if (!UseCompressedOops && !ArchiveHeapLoader::can_map()) {
1491 log_info(cds)("Cannot use CDS heap data. Selected GC not compatible -XX:-UseCompressedOops");
1492 } else {
1493 log_info(cds)("Cannot use CDS heap data. UseEpsilonGC, UseG1GC, UseSerialGC, UseParallelGC, or UseShenandoahGC are required.");
1494 }
1495 }
1496 }
1497
1498 if (!success) {
1499 if (CDSConfig::is_using_aot_linked_classes()) {
1500 // It's too late to recover -- we have already committed to use the archived metaspace objects, but
1501 // the archived heap objects cannot be loaded, so we don't have the archived FMG to guarantee that
1502 // all AOT-linked classes are visible.
1503 //
1504 // We get here because the heap is too small. The app will fail anyway. So let's quit.
1505 MetaspaceShared::unrecoverable_loading_error("CDS archive has aot-linked classes but the archived "
1506 "heap objects cannot be loaded. Try increasing your heap size.");
1507 }
1508 CDSConfig::stop_using_full_module_graph("archive heap loading failed");
1509 }
1510 }
1511
1512 bool FileMapInfo::can_use_heap_region() {
1513 if (!has_heap_region()) {
1514 return false;
1515 }
1516 if (JvmtiExport::should_post_class_file_load_hook() && JvmtiExport::has_early_class_hook_env()) {
1517 ShouldNotReachHere(); // CDS should have been disabled.
1518 // The archived objects are mapped at JVM start-up, but we don't know if
1519 // j.l.String or j.l.Class might be replaced by the ClassFileLoadHook,
1520 // which would make the archived String or mirror objects invalid. Let's be safe and not
1521 // use the archived objects. These 2 classes are loaded during the JVMTI "early" stage.
1522 //
1523 // If JvmtiExport::has_early_class_hook_env() is false, the classes of some objects
1524 // in the archived subgraphs may be replaced by the ClassFileLoadHook. But that's OK
1525 // because we won't install an archived object subgraph if the klass of any of the
1526 // referenced objects are replaced. See HeapShared::initialize_from_archived_subgraph().
1527 }
1528
1529 // We pre-compute narrow Klass IDs with the runtime mapping start intended to be the base, and a shift of
1530 // ArchiveBuilder::precomputed_narrow_klass_shift. We enforce this encoding at runtime (see
1531 // CompressedKlassPointers::initialize_for_given_encoding()). Therefore, the following assertions must
1532 // hold:
1533 address archive_narrow_klass_base = (address)header()->mapped_base_address();
1534 const int archive_narrow_klass_pointer_bits = header()->narrow_klass_pointer_bits();
1535 const int archive_narrow_klass_shift = header()->narrow_klass_shift();
1536
1537 log_info(cds)("CDS archive was created with max heap size = %zuM, and the following configuration:",
1538 max_heap_size()/M);
1539 log_info(cds)(" narrow_klass_base at mapping start address, narrow_klass_pointer_bits = %d, narrow_klass_shift = %d",
1540 archive_narrow_klass_pointer_bits, archive_narrow_klass_shift);
1541 log_info(cds)(" narrow_oop_mode = %d, narrow_oop_base = " PTR_FORMAT ", narrow_oop_shift = %d",
1542 narrow_oop_mode(), p2i(narrow_oop_base()), narrow_oop_shift());
1543 log_info(cds)("The current max heap size = %zuM, G1HeapRegion::GrainBytes = %zu",
1544 MaxHeapSize/M, G1HeapRegion::GrainBytes);
1545 log_info(cds)(" narrow_klass_base = " PTR_FORMAT ", arrow_klass_pointer_bits = %d, narrow_klass_shift = %d",
1546 p2i(CompressedKlassPointers::base()), CompressedKlassPointers::narrow_klass_pointer_bits(), CompressedKlassPointers::shift());
1547 log_info(cds)(" narrow_oop_mode = %d, narrow_oop_base = " PTR_FORMAT ", narrow_oop_shift = %d",
1548 CompressedOops::mode(), p2i(CompressedOops::base()), CompressedOops::shift());
1549 log_info(cds)(" heap range = [" PTR_FORMAT " - " PTR_FORMAT "]",
1550 UseCompressedOops ? p2i(CompressedOops::begin()) :
1551 UseG1GC ? p2i((address)G1CollectedHeap::heap()->reserved().start()) : 0L,
1552 UseCompressedOops ? p2i(CompressedOops::end()) :
1553 UseG1GC ? p2i((address)G1CollectedHeap::heap()->reserved().end()) : 0L);
1554
1555 int err = 0;
1556 if ( archive_narrow_klass_base != CompressedKlassPointers::base() ||
1557 (err = 1, archive_narrow_klass_pointer_bits != CompressedKlassPointers::narrow_klass_pointer_bits()) ||
1558 (err = 2, archive_narrow_klass_shift != CompressedKlassPointers::shift()) ) {
1559 stringStream ss;
1560 switch (err) {
1561 case 0:
1562 ss.print("Unexpected encoding base encountered (" PTR_FORMAT ", expected " PTR_FORMAT ")",
1563 p2i(CompressedKlassPointers::base()), p2i(archive_narrow_klass_base));
1564 break;
1565 case 1:
1566 ss.print("Unexpected narrow Klass bit length encountered (%d, expected %d)",
1567 CompressedKlassPointers::narrow_klass_pointer_bits(), archive_narrow_klass_pointer_bits);
1568 break;
1569 case 2:
1570 ss.print("Unexpected narrow Klass shift encountered (%d, expected %d)",
1571 CompressedKlassPointers::shift(), archive_narrow_klass_shift);
1572 break;
1573 default:
1574 ShouldNotReachHere();
1575 };
1576 LogTarget(Info, cds) lt;
1577 if (lt.is_enabled()) {
1578 LogStream ls(lt);
1579 ls.print_raw(ss.base());
1580 header()->print(&ls);
1581 }
1582 assert(false, "%s", ss.base());
1583 }
1584
1585 return true;
1586 }
1587
1588 // The actual address of this region during dump time.
1589 address FileMapInfo::heap_region_dumptime_address() {
1590 FileMapRegion* r = region_at(MetaspaceShared::hp);
1591 assert(CDSConfig::is_using_archive(), "runtime only");
1592 assert(is_aligned(r->mapping_offset(), sizeof(HeapWord)), "must be");
1593 if (UseCompressedOops) {
1594 return /*dumptime*/ (address)((uintptr_t)narrow_oop_base() + r->mapping_offset());
1595 } else {
1596 return heap_region_requested_address();
1597 }
1598 }
1599
1600 // The address where this region can be mapped into the runtime heap without
1601 // patching any of the pointers that are embedded in this region.
1602 address FileMapInfo::heap_region_requested_address() {
1603 assert(CDSConfig::is_using_archive(), "runtime only");
1604 FileMapRegion* r = region_at(MetaspaceShared::hp);
1605 assert(is_aligned(r->mapping_offset(), sizeof(HeapWord)), "must be");
1606 assert(ArchiveHeapLoader::can_use(), "GC must support mapping or loading");
1607 if (UseCompressedOops) {
1608 // We can avoid relocation if each region's offset from the runtime CompressedOops::base()
1609 // is the same as its offset from the CompressedOops::base() during dumptime.
1610 // Note that CompressedOops::base() may be different between dumptime and runtime.
1611 //
1612 // Example:
1613 // Dumptime base = 0x1000 and shift is 0. We have a region at address 0x2000. There's a
1614 // narrowOop P stored in this region that points to an object at address 0x2200.
1615 // P's encoded value is 0x1200.
1616 //
1617 // Runtime base = 0x4000 and shift is also 0. If we map this region at 0x5000, then
1618 // the value P can remain 0x1200. The decoded address = (0x4000 + (0x1200 << 0)) = 0x5200,
1619 // which is the runtime location of the referenced object.
1620 return /*runtime*/ (address)((uintptr_t)CompressedOops::base() + r->mapping_offset());
1621 } else {
1622 // This was the hard-coded requested base address used at dump time. With uncompressed oops,
1623 // the heap range is assigned by the OS so we will most likely have to relocate anyway, no matter
1624 // what base address was picked at duump time.
1625 return (address)ArchiveHeapWriter::NOCOOPS_REQUESTED_BASE;
1626 }
1627 }
1628
1629 bool FileMapInfo::map_heap_region() {
1630 if (map_heap_region_impl()) {
1631 #ifdef ASSERT
1632 // The "old" regions must be parsable -- we cannot have any unused space
1633 // at the start of the lowest G1 region that contains archived objects.
1634 assert(is_aligned(_mapped_heap_memregion.start(), G1HeapRegion::GrainBytes), "must be");
1635
1636 // Make sure we map at the very top of the heap - see comments in
1637 // init_heap_region_relocation().
1638 MemRegion heap_range = G1CollectedHeap::heap()->reserved();
1639 assert(heap_range.contains(_mapped_heap_memregion), "must be");
1640
1641 address heap_end = (address)heap_range.end();
1642 address mapped_heap_region_end = (address)_mapped_heap_memregion.end();
1643 assert(heap_end >= mapped_heap_region_end, "must be");
1644 assert(heap_end - mapped_heap_region_end < (intx)(G1HeapRegion::GrainBytes),
1645 "must be at the top of the heap to avoid fragmentation");
1646 #endif
1647
1648 ArchiveHeapLoader::set_mapped();
1649 return true;
1650 } else {
1651 return false;
1652 }
1653 }
1654
1655 bool FileMapInfo::map_heap_region_impl() {
1656 assert(UseG1GC, "the following code assumes G1");
1657
1658 FileMapRegion* r = region_at(MetaspaceShared::hp);
1659 size_t size = r->used();
1660 if (size == 0) {
1661 return false; // no archived java heap data
1662 }
1663
1664 size_t word_size = size / HeapWordSize;
1665 address requested_start = heap_region_requested_address();
1666
1667 log_info(cds)("Preferred address to map heap data (to avoid relocation) is " INTPTR_FORMAT, p2i(requested_start));
1668
1669 // allocate from java heap
1670 HeapWord* start = G1CollectedHeap::heap()->alloc_archive_region(word_size, (HeapWord*)requested_start);
1671 if (start == nullptr) {
1672 log_info(cds)("UseSharedSpaces: Unable to allocate java heap region for archive heap.");
1673 return false;
1674 }
1675
1676 _mapped_heap_memregion = MemRegion(start, word_size);
1677
1678 // Map the archived heap data. No need to call MemTracker::record_virtual_memory_tag()
1679 // for mapped region as it is part of the reserved java heap, which is already recorded.
1680 char* addr = (char*)_mapped_heap_memregion.start();
1681 char* base;
1682
1683 if (MetaspaceShared::use_windows_memory_mapping()) {
1684 if (!read_region(MetaspaceShared::hp, addr,
1685 align_up(_mapped_heap_memregion.byte_size(), os::vm_page_size()),
1686 /* do_commit = */ true)) {
1687 dealloc_heap_region();
1688 log_error(cds)("Failed to read archived heap region into " INTPTR_FORMAT, p2i(addr));
1689 return false;
1690 }
1691 // Checks for VerifySharedSpaces is already done inside read_region()
1692 base = addr;
1693 } else {
1694 base = map_memory(_fd, _full_path, r->file_offset(),
1695 addr, _mapped_heap_memregion.byte_size(), r->read_only(),
1696 r->allow_exec(), mtJavaHeap);
1697 if (base == nullptr || base != addr) {
1698 dealloc_heap_region();
1699 log_info(cds)("UseSharedSpaces: Unable to map at required address in java heap. "
1700 INTPTR_FORMAT ", size = %zu bytes",
1701 p2i(addr), _mapped_heap_memregion.byte_size());
1702 return false;
1703 }
1704
1705 if (VerifySharedSpaces && !r->check_region_crc(base)) {
1706 dealloc_heap_region();
1707 log_info(cds)("UseSharedSpaces: mapped heap region is corrupt");
1708 return false;
1709 }
1710 }
1711
1712 r->set_mapped_base(base);
1713
1714 // If the requested range is different from the range allocated by GC, then
1715 // the pointers need to be patched.
1716 address mapped_start = (address) _mapped_heap_memregion.start();
1717 ptrdiff_t delta = mapped_start - requested_start;
1718 if (UseCompressedOops &&
1719 (narrow_oop_mode() != CompressedOops::mode() ||
1720 narrow_oop_shift() != CompressedOops::shift())) {
1721 _heap_pointers_need_patching = true;
1722 }
1723 if (delta != 0) {
1724 _heap_pointers_need_patching = true;
1725 }
1726 ArchiveHeapLoader::init_mapped_heap_info(mapped_start, delta, narrow_oop_shift());
1727
1728 if (_heap_pointers_need_patching) {
1729 char* bitmap_base = map_bitmap_region();
1730 if (bitmap_base == nullptr) {
1731 log_info(cds)("CDS heap cannot be used because bitmap region cannot be mapped");
1732 dealloc_heap_region();
1733 _heap_pointers_need_patching = false;
1734 return false;
1735 }
1736 }
1737 log_info(cds)("Heap data mapped at " INTPTR_FORMAT ", size = %8zu bytes",
1738 p2i(mapped_start), _mapped_heap_memregion.byte_size());
1739 log_info(cds)("CDS heap data relocation delta = %zd bytes", delta);
1740 return true;
1741 }
1742
1743 narrowOop FileMapInfo::encoded_heap_region_dumptime_address() {
1744 assert(CDSConfig::is_using_archive(), "runtime only");
1745 assert(UseCompressedOops, "sanity");
1746 FileMapRegion* r = region_at(MetaspaceShared::hp);
1747 return CompressedOops::narrow_oop_cast(r->mapping_offset() >> narrow_oop_shift());
1748 }
1749
1750 void FileMapInfo::patch_heap_embedded_pointers() {
1751 if (!ArchiveHeapLoader::is_mapped() || !_heap_pointers_need_patching) {
1752 return;
1753 }
1754
1755 char* bitmap_base = map_bitmap_region();
1756 assert(bitmap_base != nullptr, "must have already been mapped");
1757
1758 FileMapRegion* r = region_at(MetaspaceShared::hp);
1759 ArchiveHeapLoader::patch_embedded_pointers(
1760 this, _mapped_heap_memregion,
1761 (address)(region_at(MetaspaceShared::bm)->mapped_base()) + r->oopmap_offset(),
1762 r->oopmap_size_in_bits());
1763 }
1764
1765 void FileMapInfo::fixup_mapped_heap_region() {
1766 if (ArchiveHeapLoader::is_mapped()) {
1767 assert(!_mapped_heap_memregion.is_empty(), "sanity");
1768
1769 // Populate the archive regions' G1BlockOffsetTables. That ensures
1770 // fast G1BlockOffsetTable::block_start operations for any given address
1771 // within the archive regions when trying to find start of an object
1772 // (e.g. during card table scanning).
1773 G1CollectedHeap::heap()->populate_archive_regions_bot(_mapped_heap_memregion);
1774 }
1775 }
1776
1777 // dealloc the archive regions from java heap
1778 void FileMapInfo::dealloc_heap_region() {
1779 G1CollectedHeap::heap()->dealloc_archive_regions(_mapped_heap_memregion);
1780 }
1781 #endif // INCLUDE_CDS_JAVA_HEAP
1782
1783 void FileMapInfo::unmap_regions(int regions[], int num_regions) {
1784 for (int r = 0; r < num_regions; r++) {
1785 int idx = regions[r];
1786 unmap_region(idx);
1787 }
1788 }
1789
1790 // Unmap a memory region in the address space.
1791
1792 void FileMapInfo::unmap_region(int i) {
1793 FileMapRegion* r = region_at(i);
1794 char* mapped_base = r->mapped_base();
1795 size_t size = r->used_aligned();
1796
1797 if (mapped_base != nullptr) {
1798 if (size > 0 && r->mapped_from_file()) {
1799 log_info(cds)("Unmapping region #%d at base " INTPTR_FORMAT " (%s)", i, p2i(mapped_base),
1800 shared_region_name[i]);
1801 if (r->in_reserved_space()) {
1802 // This region was mapped inside a ReservedSpace. Its memory will be freed when the ReservedSpace
1803 // is released. Zero it so that we don't accidentally read its content.
1804 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]);
1805 } else {
1806 if (!os::unmap_memory(mapped_base, size)) {
1807 fatal("os::unmap_memory failed");
1808 }
1809 }
1810 }
1811 r->set_mapped_base(nullptr);
1812 }
1813 }
1814
1815 void FileMapInfo::assert_mark(bool check) {
1816 if (!check) {
1817 MetaspaceShared::unrecoverable_loading_error("Mark mismatch while restoring from shared file.");
1818 }
1819 }
1820
1821 FileMapInfo* FileMapInfo::_current_info = nullptr;
1822 FileMapInfo* FileMapInfo::_dynamic_archive_info = nullptr;
1823 bool FileMapInfo::_heap_pointers_need_patching = false;
1824 bool FileMapInfo::_memory_mapping_failed = false;
1825
1826 // Open the shared archive file, read and validate the header
1827 // information (version, boot classpath, etc.). If initialization
1828 // fails, shared spaces are disabled and the file is closed.
1829 //
1830 // Validation of the archive is done in two steps:
1831 //
1832 // [1] validate_header() - done here.
1833 // [2] validate_shared_path_table - this is done later, because the table is in the RO
1834 // region of the archive, which is not mapped yet.
1835 bool FileMapInfo::open_as_input() {
1836 assert(CDSConfig::is_using_archive(), "UseSharedSpaces expected.");
1837 assert(Arguments::has_jimage(), "The shared archive file cannot be used with an exploded module build.");
1838
1839 if (JvmtiExport::should_post_class_file_load_hook() && JvmtiExport::has_early_class_hook_env()) {
1840 // CDS assumes that no classes resolved in vmClasses::resolve_all()
1841 // are replaced at runtime by JVMTI ClassFileLoadHook. All of those classes are resolved
1842 // during the JVMTI "early" stage, so we can still use CDS if
1843 // JvmtiExport::has_early_class_hook_env() is false.
1844 log_info(cds)("CDS is disabled because early JVMTI ClassFileLoadHook is in use.");
1845 return false;
1846 }
1847
1848 if (!open_for_read() || !init_from_file(_fd) || !validate_header()) {
1849 if (_is_static) {
1850 log_info(cds)("Loading static archive failed.");
1851 return false;
1852 } else {
1853 log_info(cds)("Loading dynamic archive failed.");
1854 if (AutoCreateSharedArchive) {
1855 CDSConfig::enable_dumping_dynamic_archive(_full_path);
1856 }
1857 return false;
1858 }
1859 }
1860
1861 return true;
1862 }
1863
1864 bool FileMapInfo::validate_aot_class_linking() {
1865 // These checks need to be done after FileMapInfo::initialize(), which gets called before Universe::heap()
1866 // is available.
1867 if (header()->has_aot_linked_classes()) {
1868 CDSConfig::set_has_aot_linked_classes(true);
1869 if (JvmtiExport::should_post_class_file_load_hook()) {
1870 log_error(cds)("CDS archive has aot-linked classes. It cannot be used when JVMTI ClassFileLoadHook is in use.");
1871 return false;
1872 }
1873 if (JvmtiExport::has_early_vmstart_env()) {
1874 log_error(cds)("CDS archive has aot-linked classes. It cannot be used when JVMTI early vm start is in use.");
1875 return false;
1876 }
1877 if (!CDSConfig::is_using_full_module_graph()) {
1878 log_error(cds)("CDS archive has aot-linked classes. It cannot be used when archived full module graph is not used.");
1879 return false;
1880 }
1881
1882 const char* prop = Arguments::get_property("java.security.manager");
1883 if (prop != nullptr && strcmp(prop, "disallow") != 0) {
1884 log_error(cds)("CDS archive has aot-linked classes. It cannot be used with -Djava.security.manager=%s.", prop);
1885 return false;
1886 }
1887
1888 #if INCLUDE_JVMTI
1889 if (Arguments::has_jdwp_agent()) {
1890 log_error(cds)("CDS archive has aot-linked classes. It cannot be used with JDWP agent");
1891 return false;
1892 }
1893 #endif
1894 }
1895
1896 return true;
1897 }
1898
1899 // The 2 core spaces are RW->RO
1900 FileMapRegion* FileMapInfo::first_core_region() const {
1901 return region_at(MetaspaceShared::rw);
1902 }
1903
1904 FileMapRegion* FileMapInfo::last_core_region() const {
1905 return region_at(MetaspaceShared::ro);
1906 }
1907
1908 void FileMapInfo::print(outputStream* st) const {
1909 header()->print(st);
1910 if (!is_static()) {
1911 dynamic_header()->print(st);
1912 }
1913 }
1914
1915 void FileMapHeader::set_as_offset(char* p, size_t *offset) {
1916 *offset = ArchiveBuilder::current()->any_to_offset((address)p);
1917 }
1918
1919 int FileMapHeader::compute_crc() {
1920 char* start = (char*)this;
1921 // start computing from the field after _header_size to end of base archive name.
1922 char* buf = (char*)&(_generic_header._header_size) + sizeof(_generic_header._header_size);
1923 size_t sz = header_size() - (buf - start);
1924 int crc = ClassLoader::crc32(0, buf, (jint)sz);
1925 return crc;
1926 }
1927
1928 // This function should only be called during run time with UseSharedSpaces enabled.
1929 bool FileMapHeader::validate() {
1930 const char* file_type = CDSConfig::type_of_archive_being_loaded();
1931 if (_obj_alignment != ObjectAlignmentInBytes) {
1932 log_info(cds)("The %s's ObjectAlignmentInBytes of %d"
1933 " does not equal the current ObjectAlignmentInBytes of %d.",
1934 file_type, _obj_alignment, ObjectAlignmentInBytes);
1935 return false;
1936 }
1937 if (_compact_strings != CompactStrings) {
1938 log_info(cds)("The %s's CompactStrings setting (%s)"
1939 " does not equal the current CompactStrings setting (%s).", file_type,
1940 _compact_strings ? "enabled" : "disabled",
1941 CompactStrings ? "enabled" : "disabled");
1942 return false;
1943 }
1944
1945 // This must be done after header validation because it might change the
1946 // header data
1947 const char* prop = Arguments::get_property("java.system.class.loader");
1948 if (prop != nullptr) {
1949 if (has_aot_linked_classes()) {
1950 log_error(cds)("CDS archive has aot-linked classes. It cannot be used when the "
1951 "java.system.class.loader property is specified.");
1952 return false;
1953 }
1954 log_warning(cds)("Archived non-system classes are disabled because the "
1955 "java.system.class.loader property is specified (value = \"%s\"). "
1956 "To use archived non-system classes, this property must not be set", prop);
1957 _has_platform_or_app_classes = false;
1958 }
1959
1960
1961 if (!_verify_local && BytecodeVerificationLocal) {
1962 // we cannot load boot classes, so there's no point of using the CDS archive
1963 log_info(cds)("The %s's BytecodeVerificationLocal setting (%s)"
1964 " does not equal the current BytecodeVerificationLocal setting (%s).", file_type,
1965 _verify_local ? "enabled" : "disabled",
1966 BytecodeVerificationLocal ? "enabled" : "disabled");
1967 return false;
1968 }
1969
1970 // For backwards compatibility, we don't check the BytecodeVerificationRemote setting
1971 // if the archive only contains system classes.
1972 if (_has_platform_or_app_classes
1973 && !_verify_remote // we didn't verify the archived platform/app classes
1974 && BytecodeVerificationRemote) { // but we want to verify all loaded platform/app classes
1975 log_info(cds)("The %s was created with less restrictive "
1976 "verification setting than the current setting.", file_type);
1977 // Pretend that we didn't have any archived platform/app classes, so they won't be loaded
1978 // by SystemDictionaryShared.
1979 _has_platform_or_app_classes = false;
1980 }
1981
1982 // Java agents are allowed during run time. Therefore, the following condition is not
1983 // checked: (!_allow_archiving_with_java_agent && AllowArchivingWithJavaAgent)
1984 // Note: _allow_archiving_with_java_agent is set in the shared archive during dump time
1985 // while AllowArchivingWithJavaAgent is set during the current run.
1986 if (_allow_archiving_with_java_agent && !AllowArchivingWithJavaAgent) {
1987 log_warning(cds)("The setting of the AllowArchivingWithJavaAgent is different "
1988 "from the setting in the %s.", file_type);
1989 return false;
1990 }
1991
1992 if (_allow_archiving_with_java_agent) {
1993 log_warning(cds)("This %s was created with AllowArchivingWithJavaAgent. It should be used "
1994 "for testing purposes only and should not be used in a production environment", file_type);
1995 }
1996
1997 log_info(cds)("The %s was created with UseCompressedOops = %d, UseCompressedClassPointers = %d, UseCompactObjectHeaders = %d",
1998 file_type, compressed_oops(), compressed_class_pointers(), compact_headers());
1999 if (compressed_oops() != UseCompressedOops || compressed_class_pointers() != UseCompressedClassPointers) {
2000 log_warning(cds)("Unable to use %s.\nThe saved state of UseCompressedOops and UseCompressedClassPointers is "
2001 "different from runtime, CDS will be disabled.", file_type);
2002 return false;
2003 }
2004
2005 if (is_static()) {
2006 const char* err = nullptr;
2007 if (CDSConfig::is_valhalla_preview()) {
2008 if (!_has_valhalla_patched_classes) {
2009 err = "not created";
2010 }
2011 } else {
2012 if (_has_valhalla_patched_classes) {
2013 err = "created";
2014 }
2015 }
2016 if (err != nullptr) {
2017 log_warning(cds)("This archive was %s with --enable-preview -XX:+EnableValhalla. It is "
2018 "incompatible with the current JVM setting", err);
2019 return false;
2020 }
2021 }
2022
2023 if (compact_headers() != UseCompactObjectHeaders) {
2024 log_warning(cds)("Unable to use %s.\nThe %s's UseCompactObjectHeaders setting (%s)"
2025 " does not equal the current UseCompactObjectHeaders setting (%s).", file_type, file_type,
2026 _compact_headers ? "enabled" : "disabled",
2027 UseCompactObjectHeaders ? "enabled" : "disabled");
2028 return false;
2029 }
2030
2031 if (!_use_optimized_module_handling && !CDSConfig::is_dumping_final_static_archive()) {
2032 CDSConfig::stop_using_optimized_module_handling();
2033 log_info(cds)("optimized module handling: disabled because archive was created without optimized module handling");
2034 }
2035
2036 if (is_static()) {
2037 // Only the static archive can contain the full module graph.
2038 if (!_has_full_module_graph) {
2039 CDSConfig::stop_using_full_module_graph("archive was created without full module graph");
2040 }
2041 }
2042
2043 return true;
2044 }
2045
2046 bool FileMapInfo::validate_header() {
2047 if (!header()->validate()) {
2048 return false;
2049 }
2050 if (_is_static) {
2051 return true;
2052 } else {
2053 return DynamicArchive::validate(this);
2054 }
2055 }
2056
2057 #if INCLUDE_JVMTI
2058 ClassPathEntry** FileMapInfo::_classpath_entries_for_jvmti = nullptr;
2059
2060 ClassPathEntry* FileMapInfo::get_classpath_entry_for_jvmti(int i, TRAPS) {
2061 if (i == 0) {
2062 // index 0 corresponds to the ClassPathImageEntry which is a globally shared object
2063 // and should never be deleted.
2064 return ClassLoader::get_jrt_entry();
2065 }
2066 ClassPathEntry* ent = _classpath_entries_for_jvmti[i];
2067 if (ent == nullptr) {
2068 const AOTClassLocation* cl = AOTClassLocationConfig::runtime()->class_location_at(i);
2069 const char* path = cl->path();
2070 struct stat st;
2071 if (os::stat(path, &st) != 0) {
2072 char *msg = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(path) + 128);
2073 jio_snprintf(msg, strlen(path) + 127, "error in finding JAR file %s", path);
2074 THROW_MSG_(vmSymbols::java_io_IOException(), msg, nullptr);
2075 } else {
2076 ent = ClassLoader::create_class_path_entry(THREAD, path, &st);
2077 if (ent == nullptr) {
2078 char *msg = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(path) + 128);
2079 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
2080 THROW_MSG_(vmSymbols::java_io_IOException(), msg, nullptr);
2081 }
2082 }
2083
2084 MutexLocker mu(THREAD, CDSClassFileStream_lock);
2085 if (_classpath_entries_for_jvmti[i] == nullptr) {
2086 _classpath_entries_for_jvmti[i] = ent;
2087 } else {
2088 // Another thread has beat me to creating this entry
2089 delete ent;
2090 ent = _classpath_entries_for_jvmti[i];
2091 }
2092 }
2093
2094 return ent;
2095 }
2096
2097 ClassFileStream* FileMapInfo::open_stream_for_jvmti(InstanceKlass* ik, Handle class_loader, TRAPS) {
2098 int path_index = ik->shared_classpath_index();
2099 assert(path_index >= 0, "should be called for shared built-in classes only");
2100 assert(path_index < AOTClassLocationConfig::runtime()->length(), "sanity");
2101
2102 ClassPathEntry* cpe = get_classpath_entry_for_jvmti(path_index, CHECK_NULL);
2103 assert(cpe != nullptr, "must be");
2104
2105 Symbol* name = ik->name();
2106 const char* const class_name = name->as_C_string();
2107 const char* const file_name = ClassLoader::file_name_for_class_name(class_name,
2108 name->utf8_length());
2109 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader());
2110 const AOTClassLocation* cl = AOTClassLocationConfig::runtime()->class_location_at(path_index);
2111 ClassFileStream* cfs;
2112 if (class_loader() != nullptr && cl->is_multi_release_jar()) {
2113 // This class was loaded from a multi-release JAR file during dump time. The
2114 // process for finding its classfile is complex. Let's defer to the Java code
2115 // in java.lang.ClassLoader.
2116 cfs = get_stream_from_class_loader(class_loader, cpe, file_name, CHECK_NULL);
2117 } else {
2118 cfs = cpe->open_stream_for_loader(THREAD, file_name, loader_data);
2119 }
2120 assert(cfs != nullptr, "must be able to read the classfile data of shared classes for built-in loaders.");
2121 log_debug(cds, jvmti)("classfile data for %s [%d: %s] = %d bytes", class_name, path_index,
2122 cfs->source(), cfs->length());
2123 return cfs;
2124 }
2125
2126 ClassFileStream* FileMapInfo::get_stream_from_class_loader(Handle class_loader,
2127 ClassPathEntry* cpe,
2128 const char* file_name,
2129 TRAPS) {
2130 JavaValue result(T_OBJECT);
2131 oop class_name = java_lang_String::create_oop_from_str(file_name, THREAD);
2132 Handle h_class_name = Handle(THREAD, class_name);
2133
2134 // byte[] ClassLoader.getResourceAsByteArray(String name)
2135 JavaCalls::call_virtual(&result,
2136 class_loader,
2137 vmClasses::ClassLoader_klass(),
2138 vmSymbols::getResourceAsByteArray_name(),
2139 vmSymbols::getResourceAsByteArray_signature(),
2140 h_class_name,
2141 CHECK_NULL);
2142 assert(result.get_type() == T_OBJECT, "just checking");
2143 oop obj = result.get_oop();
2144 assert(obj != nullptr, "ClassLoader.getResourceAsByteArray should not return null");
2145
2146 // copy from byte[] to a buffer
2147 typeArrayOop ba = typeArrayOop(obj);
2148 jint len = ba->length();
2149 u1* buffer = NEW_RESOURCE_ARRAY(u1, len);
2150 ArrayAccess<>::arraycopy_to_native<>(ba, typeArrayOopDesc::element_offset<jbyte>(0), buffer, len);
2151
2152 return new ClassFileStream(buffer, len, cpe->name());
2153 }
2154 #endif