1 /*
2 * Copyright (c) 2003, 2026, 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/aotLogging.hpp"
27 #include "cds/aotMappedHeapLoader.hpp"
28 #include "cds/aotMappedHeapWriter.hpp"
29 #include "cds/aotMetaspace.hpp"
30 #include "cds/archiveBuilder.hpp"
31 #include "cds/archiveUtils.inline.hpp"
32 #include "cds/cds_globals.hpp"
33 #include "cds/cdsConfig.hpp"
34 #include "cds/dynamicArchive.hpp"
35 #include "cds/filemap.hpp"
36 #include "cds/heapShared.inline.hpp"
37 #include "classfile/altHashing.hpp"
38 #include "classfile/classFileStream.hpp"
39 #include "classfile/classLoader.hpp"
40 #include "classfile/classLoader.inline.hpp"
41 #include "classfile/classLoaderData.inline.hpp"
42 #include "classfile/symbolTable.hpp"
43 #include "classfile/systemDictionaryShared.hpp"
44 #include "classfile/vmClasses.hpp"
45 #include "classfile/vmSymbols.hpp"
46 #include "compiler/compilerDefinitions.inline.hpp"
47 #include "jvm.h"
48 #include "logging/log.hpp"
49 #include "logging/logMessage.hpp"
50 #include "logging/logStream.hpp"
51 #include "memory/iterator.inline.hpp"
52 #include "memory/metadataFactory.hpp"
53 #include "memory/metaspaceClosure.hpp"
54 #include "memory/oopFactory.hpp"
55 #include "memory/universe.hpp"
56 #include "nmt/memTracker.hpp"
57 #include "oops/access.hpp"
58 #include "oops/compressedKlass.hpp"
59 #include "oops/compressedOops.hpp"
60 #include "oops/compressedOops.inline.hpp"
61 #include "oops/objArrayOop.hpp"
62 #include "oops/oop.inline.hpp"
63 #include "oops/trainingData.hpp"
64 #include "oops/typeArrayKlass.hpp"
65 #include "prims/jvmtiExport.hpp"
66 #include "runtime/arguments.hpp"
67 #include "runtime/globals_extension.hpp"
68 #include "runtime/java.hpp"
69 #include "runtime/javaCalls.hpp"
70 #include "runtime/mutexLocker.hpp"
71 #include "runtime/os.hpp"
72 #include "runtime/vm_version.hpp"
73 #include "utilities/align.hpp"
74 #include "utilities/bitMap.inline.hpp"
75 #include "utilities/classpathStream.hpp"
76 #include "utilities/defaultStream.hpp"
77 #include "utilities/ostream.hpp"
78 #if INCLUDE_G1GC
79 #include "gc/g1/g1CollectedHeap.hpp"
80 #include "gc/g1/g1HeapRegion.hpp"
81 #endif
82
83 #include <errno.h>
84 #include <sys/stat.h>
85
86 #ifndef O_BINARY // if defined (Win32) use binary files.
87 #define O_BINARY 0 // otherwise do nothing.
88 #endif
89
90 inline void CDSMustMatchFlags::do_print(outputStream* st, bool v) {
91 st->print("%s", v ? "true" : "false");
92 }
93
94 #ifdef _LP64
95 inline void CDSMustMatchFlags::do_print(outputStream* st, uint v) {
96 st->print("%u", v);
97 }
98 #endif
99
100 inline void CDSMustMatchFlags::do_print(outputStream* st, intx v) {
101 st->print("%zd", v);
102 }
103
104 inline void CDSMustMatchFlags::do_print(outputStream* st, uintx v) {
105 st->print("%zu", v);
106 }
107
108 inline void CDSMustMatchFlags::do_print(outputStream* st, double v) {
109 st->print("%f", v);
110 }
111
112 void CDSMustMatchFlags::init() {
113 assert(CDSConfig::is_dumping_archive(), "sanity");
114 _max_name_width = 0;
115
116 #define INIT_CDS_MUST_MATCH_FLAG(n) \
117 _v_##n = n; \
118 _max_name_width = MAX2(_max_name_width,strlen(#n));
119 CDS_MUST_MATCH_FLAGS_DO(INIT_CDS_MUST_MATCH_FLAG);
120 #undef INIT_CDS_MUST_MATCH_FLAG
121 }
122
123 bool CDSMustMatchFlags::runtime_check() const {
124 #define CHECK_CDS_MUST_MATCH_FLAG(n) \
125 if (_v_##n != n) { \
126 ResourceMark rm; \
127 stringStream ss; \
128 ss.print("VM option %s is different between dumptime (", #n); \
129 do_print(&ss, _v_ ## n); \
130 ss.print(") and runtime ("); \
131 do_print(&ss, n); \
132 ss.print(")"); \
133 log_info(cds)("%s", ss.as_string()); \
134 return false; \
135 }
136 CDS_MUST_MATCH_FLAGS_DO(CHECK_CDS_MUST_MATCH_FLAG);
137 #undef CHECK_CDS_MUST_MATCH_FLAG
138
139 return true;
140 }
141
142 void CDSMustMatchFlags::print_info() const {
143 LogTarget(Info, cds) lt;
144 if (lt.is_enabled()) {
145 LogStream ls(lt);
146 ls.print_cr("Recorded VM flags during dumptime:");
147 print(&ls);
148 }
149 }
150
151 void CDSMustMatchFlags::print(outputStream* st) const {
152 #define PRINT_CDS_MUST_MATCH_FLAG(n) \
153 st->print("- %-s ", #n); \
154 st->sp(int(_max_name_width - strlen(#n))); \
155 do_print(st, _v_##n); \
156 st->cr();
157 CDS_MUST_MATCH_FLAGS_DO(PRINT_CDS_MUST_MATCH_FLAG);
158 #undef PRINT_CDS_MUST_MATCH_FLAG
159 }
160
161 // Fill in the fileMapInfo structure with data about this VM instance.
162
163 // This method copies the vm version info into header_version. If the version is too
164 // long then a truncated version, which has a hash code appended to it, is copied.
165 //
166 // Using a template enables this method to verify that header_version is an array of
167 // length JVM_IDENT_MAX. This ensures that the code that writes to the CDS file and
168 // the code that reads the CDS file will both use the same size buffer. Hence, will
169 // use identical truncation. This is necessary for matching of truncated versions.
170 template <int N> static void get_header_version(char (&header_version) [N]) {
171 assert(N == JVM_IDENT_MAX, "Bad header_version size");
172
173 const char *vm_version = VM_Version::internal_vm_info_string();
174 const int version_len = (int)strlen(vm_version);
175
176 memset(header_version, 0, JVM_IDENT_MAX);
177
178 if (version_len < (JVM_IDENT_MAX-1)) {
179 strcpy(header_version, vm_version);
180
181 } else {
182 // Get the hash value. Use a static seed because the hash needs to return the same
183 // value over multiple jvm invocations.
184 uint32_t hash = AltHashing::halfsiphash_32(8191, (const uint8_t*)vm_version, version_len);
185
186 // Truncate the ident, saving room for the 8 hex character hash value.
187 strncpy(header_version, vm_version, JVM_IDENT_MAX-9);
188
189 // Append the hash code as eight hex digits.
190 os::snprintf_checked(&header_version[JVM_IDENT_MAX-9], 9, "%08x", hash);
191 }
192
193 assert(header_version[JVM_IDENT_MAX-1] == 0, "must be");
194 }
195
196 FileMapInfo::FileMapInfo(const char* full_path, bool is_static) :
197 _is_static(is_static), _file_open(false), _is_mapped(false), _fd(-1), _file_offset(0),
198 _full_path(full_path), _base_archive_name(nullptr), _header(nullptr) {
199 if (_is_static) {
200 assert(_current_info == nullptr, "must be singleton"); // not thread safe
201 _current_info = this;
202 } else {
203 assert(_dynamic_archive_info == nullptr, "must be singleton"); // not thread safe
204 _dynamic_archive_info = this;
205 }
206 }
207
208 FileMapInfo::~FileMapInfo() {
209 if (_is_static) {
210 assert(_current_info == this, "must be singleton"); // not thread safe
211 _current_info = nullptr;
212 } else {
213 assert(_dynamic_archive_info == this, "must be singleton"); // not thread safe
214 _dynamic_archive_info = nullptr;
215 }
216
217 if (_header != nullptr) {
218 os::free(_header);
219 }
220
221 if (_file_open) {
222 ::close(_fd);
223 }
224 }
225
226 void FileMapInfo::free_current_info() {
227 assert(CDSConfig::is_dumping_final_static_archive(), "only supported in this mode");
228 assert(_current_info != nullptr, "sanity");
229 delete _current_info;
230 assert(_current_info == nullptr, "sanity"); // Side effect expected from the above "delete" operator.
231 }
232
233 void FileMapInfo::populate_header(size_t core_region_alignment) {
234 assert(_header == nullptr, "Sanity check");
235 size_t c_header_size;
236 size_t header_size;
237 size_t base_archive_name_size = 0;
238 size_t base_archive_name_offset = 0;
239 if (is_static()) {
240 c_header_size = sizeof(FileMapHeader);
241 header_size = c_header_size;
242 } else {
243 // dynamic header including base archive name for non-default base archive
244 c_header_size = sizeof(DynamicArchiveHeader);
245 header_size = c_header_size;
246
247 const char* default_base_archive_name = CDSConfig::default_archive_path();
248 const char* current_base_archive_name = CDSConfig::input_static_archive_path();
249 if (!os::same_files(current_base_archive_name, default_base_archive_name)) {
250 base_archive_name_size = strlen(current_base_archive_name) + 1;
251 header_size += base_archive_name_size;
252 base_archive_name_offset = c_header_size;
253 }
254 }
255 _header = (FileMapHeader*)os::malloc(header_size, mtInternal);
256 memset((void*)_header, 0, header_size);
257 _header->populate(this,
258 core_region_alignment,
259 header_size,
260 base_archive_name_size,
261 base_archive_name_offset);
262 }
263
264 void FileMapHeader::populate(FileMapInfo *info, size_t core_region_alignment,
265 size_t header_size, size_t base_archive_name_size,
266 size_t base_archive_name_offset) {
267 // 1. We require _generic_header._magic to be at the beginning of the file
268 // 2. FileMapHeader also assumes that _generic_header is at the beginning of the file
269 assert(offset_of(FileMapHeader, _generic_header) == 0, "must be");
270 set_header_size((unsigned int)header_size);
271 set_base_archive_name_offset((unsigned int)base_archive_name_offset);
272 set_base_archive_name_size((unsigned int)base_archive_name_size);
273 if (CDSConfig::is_dumping_dynamic_archive()) {
274 set_magic(CDS_DYNAMIC_ARCHIVE_MAGIC);
275 } else if (CDSConfig::is_dumping_preimage_static_archive()) {
276 set_magic(CDS_PREIMAGE_ARCHIVE_MAGIC);
277 } else {
278 set_magic(CDS_ARCHIVE_MAGIC);
279 }
280 set_version(CURRENT_CDS_ARCHIVE_VERSION);
281
282 if (!info->is_static() && base_archive_name_size != 0) {
283 // copy base archive name
284 copy_base_archive_name(CDSConfig::input_static_archive_path());
285 }
286 _core_region_alignment = core_region_alignment;
287 _obj_alignment = ObjectAlignmentInBytes;
288 _compact_strings = CompactStrings;
289 _compact_headers = UseCompactObjectHeaders;
290 #if INCLUDE_CDS_JAVA_HEAP
291 if (CDSConfig::is_dumping_heap()) {
292 _object_streaming_mode = HeapShared::is_writing_streaming_mode();
293 _narrow_oop_mode = AOTMappedHeapWriter::narrow_oop_mode();
294 _narrow_oop_base = AOTMappedHeapWriter::narrow_oop_base();
295 _narrow_oop_shift = AOTMappedHeapWriter::narrow_oop_shift();
296 }
297 #endif
298 _compressed_oops = UseCompressedOops;
299 _compatible_oop_compression = AOTCompatibleOopCompression;
300 _narrow_klass_pointer_bits = CompressedKlassPointers::narrow_klass_pointer_bits();
301 _narrow_klass_shift = ArchiveBuilder::precomputed_narrow_klass_shift();
302
303 // Which JIT compier is used
304 _type_profile_level = TypeProfileLevel;
305 _type_profile_args_limit = TypeProfileArgsLimit;
306 _type_profile_parms_limit = TypeProfileParmsLimit;
307 _type_profile_width = TypeProfileWidth;
308 _bci_profile_width = BciProfileWidth;
309 _profile_traps = ProfileTraps;
310 _type_profile_casts = TypeProfileCasts;
311 _spec_trap_limit_extra_entries = SpecTrapLimitExtraEntries;
312 _max_heap_size = MaxHeapSize;
313 _use_optimized_module_handling = CDSConfig::is_using_optimized_module_handling();
314 _has_aot_linked_classes = CDSConfig::is_dumping_aot_linked_classes();
315 _has_full_module_graph = CDSConfig::is_dumping_full_module_graph();
316 _has_valhalla_patched_classes = Arguments::is_valhalla_enabled();
317
318 // The following fields are for sanity checks for whether this archive
319 // will function correctly with this JVM and the bootclasspath it's
320 // invoked with.
321
322 // JVM version string ... changes on each build.
323 get_header_version(_jvm_ident);
324
325 _verify_local = BytecodeVerificationLocal;
326 _verify_remote = BytecodeVerificationRemote;
327 _has_platform_or_app_classes = AOTClassLocationConfig::dumptime()->has_platform_or_app_classes();
328 _requested_base_address = (char*)SharedBaseAddress;
329 _mapped_base_address = (char*)SharedBaseAddress;
330 _must_match.init();
331 }
332
333 void FileMapHeader::copy_base_archive_name(const char* archive) {
334 assert(base_archive_name_size() != 0, "_base_archive_name_size not set");
335 assert(base_archive_name_offset() != 0, "_base_archive_name_offset not set");
336 assert(header_size() > sizeof(*this), "_base_archive_name_size not included in header size?");
337 memcpy((char*)this + base_archive_name_offset(), archive, base_archive_name_size());
338 }
339
340 void FileMapHeader::print(outputStream* st) {
341 ResourceMark rm;
342
343 st->print_cr("- magic: 0x%08x", magic());
344 st->print_cr("- crc: 0x%08x", crc());
345 st->print_cr("- version: 0x%x", version());
346 st->print_cr("- header_size: " UINT32_FORMAT, header_size());
347 st->print_cr("- base_archive_name_offset: " UINT32_FORMAT, base_archive_name_offset());
348 st->print_cr("- base_archive_name_size: " UINT32_FORMAT, base_archive_name_size());
349
350 for (int i = 0; i < NUM_CDS_REGIONS; i++) {
351 FileMapRegion* r = region_at(i);
352 r->print(st, i);
353 }
354 st->print_cr("============ end regions ======== ");
355
356 st->print_cr("- core_region_alignment: %zu", _core_region_alignment);
357 st->print_cr("- obj_alignment: %d", _obj_alignment);
358 st->print_cr("- narrow_oop_base: " INTPTR_FORMAT, p2i(_narrow_oop_base));
359 st->print_cr("- narrow_oop_shift %d", _narrow_oop_shift);
360 st->print_cr("- compact_strings: %d", _compact_strings);
361 st->print_cr("- compact_headers: %d", _compact_headers);
362 st->print_cr("- max_heap_size: %zu", _max_heap_size);
363 st->print_cr("- narrow_oop_mode: %d", _narrow_oop_mode);
364 st->print_cr("- compressed_oops: %d", _compressed_oops);
365 st->print_cr("- narrow_klass_pointer_bits: %d", _narrow_klass_pointer_bits);
366 st->print_cr("- narrow_klass_shift: %d", _narrow_klass_shift);
367 st->print_cr("- cloned_vtables: %u", cast_to_u4(_cloned_vtables));
368 st->print_cr("- early_serialized_data: %u", cast_to_u4(_early_serialized_data));
369 st->print_cr("- serialized_data: %u", cast_to_u4(_serialized_data));
370 st->print_cr("- jvm_ident: %s", _jvm_ident);
371 st->print_cr("- class_location_config: %d", cast_to_u4(_class_location_config));
372 st->print_cr("- verify_local: %d", _verify_local);
373 st->print_cr("- verify_remote: %d", _verify_remote);
374 st->print_cr("- has_platform_or_app_classes: %d", _has_platform_or_app_classes);
375 st->print_cr("- requested_base_address: " INTPTR_FORMAT, p2i(_requested_base_address));
376 st->print_cr("- mapped_base_address: " INTPTR_FORMAT, p2i(_mapped_base_address));
377
378 st->print_cr("- object_streaming_mode: %d", _object_streaming_mode);
379 st->print_cr("- mapped_heap_header");
380 st->print_cr(" - root_segments");
381 st->print_cr(" - roots_count: %d", _mapped_heap_header.root_segments().roots_count());
382 st->print_cr(" - base_offset: 0x%zx", _mapped_heap_header.root_segments().base_offset());
383 st->print_cr(" - count: %zu", _mapped_heap_header.root_segments().count());
384 st->print_cr(" - max_size_elems: %d", _mapped_heap_header.root_segments().max_size_in_elems());
385 st->print_cr(" - max_size_bytes: %zu", _mapped_heap_header.root_segments().max_size_in_bytes());
386 st->print_cr(" - oopmap_start_pos: %zu", _mapped_heap_header.oopmap_start_pos());
387 st->print_cr(" - oopmap_ptrmap_pos: %zu", _mapped_heap_header.ptrmap_start_pos());
388 st->print_cr("- streamed_heap_header");
389 st->print_cr(" - forwarding_offset: %zu", _streamed_heap_header.forwarding_offset());
390 st->print_cr(" - roots_offset: %zu", _streamed_heap_header.roots_offset());
391 st->print_cr(" - num_roots: %zu", _streamed_heap_header.num_roots());
392 st->print_cr(" - root_highest_object_index_table_offset: %zu", _streamed_heap_header.root_highest_object_index_table_offset());
393 st->print_cr(" - num_archived_objects: %zu", _streamed_heap_header.num_archived_objects());
394
395 st->print_cr("- _rw_ptrmap_start_pos: %zu", _rw_ptrmap_start_pos);
396 st->print_cr("- _ro_ptrmap_start_pos: %zu", _ro_ptrmap_start_pos);
397 st->print_cr("- use_optimized_module_handling: %d", _use_optimized_module_handling);
398 st->print_cr("- has_full_module_graph %d", _has_full_module_graph);
399 st->print_cr("- has_valhalla_patched_classes %d", _has_valhalla_patched_classes);
400 _must_match.print(st);
401 st->print_cr("- has_aot_linked_classes %d", _has_aot_linked_classes);
402 }
403
404 bool FileMapInfo::validate_class_location() {
405 assert(CDSConfig::is_using_archive(), "runtime only");
406
407 AOTClassLocationConfig* config = header()->class_location_config();
408 bool has_extra_module_paths = false;
409 if (!config->validate(full_path(), header()->has_aot_linked_classes(), &has_extra_module_paths)) {
410 if (PrintSharedArchiveAndExit) {
411 AOTMetaspace::set_archive_loading_failed();
412 return true;
413 } else {
414 return false;
415 }
416 }
417
418 if (header()->has_full_module_graph() && has_extra_module_paths) {
419 CDSConfig::stop_using_optimized_module_handling();
420 AOTMetaspace::report_loading_error("optimized module handling: disabled because extra module path(s) are specified");
421 }
422
423 if (CDSConfig::is_dumping_dynamic_archive()) {
424 // Only support dynamic dumping with the usage of the default CDS archive
425 // or a simple base archive.
426 // If the base layer archive contains additional path component besides
427 // the runtime image and the -cp, dynamic dumping is disabled.
428 if (config->num_boot_classpaths() > 0) {
429 CDSConfig::disable_dumping_dynamic_archive();
430 aot_log_warning(aot)(
431 "Dynamic archiving is disabled because base layer archive has appended boot classpath");
432 }
433 if (config->num_module_paths() > 0) {
434 if (has_extra_module_paths) {
435 CDSConfig::disable_dumping_dynamic_archive();
436 aot_log_warning(aot)(
437 "Dynamic archiving is disabled because base layer archive has a different module path");
438 }
439 }
440 }
441
442 #if INCLUDE_JVMTI
443 if (_classpath_entries_for_jvmti != nullptr) {
444 os::free(_classpath_entries_for_jvmti);
445 }
446 size_t sz = sizeof(ClassPathEntry*) * AOTClassLocationConfig::runtime()->length();
447 _classpath_entries_for_jvmti = (ClassPathEntry**)os::malloc(sz, mtClass);
448 memset((void*)_classpath_entries_for_jvmti, 0, sz);
449 #endif
450
451 return true;
452 }
453
454 // A utility class for reading/validating the GenericCDSFileMapHeader portion of
455 // a CDS archive's header. The file header of all CDS archives with versions from
456 // CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION (12) are guaranteed to always start
457 // with GenericCDSFileMapHeader. This makes it possible to read important information
458 // from a CDS archive created by a different version of HotSpot, so that we can
459 // automatically regenerate the archive as necessary (JDK-8261455).
460 class FileHeaderHelper {
461 int _fd;
462 bool _is_valid;
463 bool _is_static;
464 GenericCDSFileMapHeader* _header;
465 const char* _archive_name;
466 const char* _base_archive_name;
467
468 public:
469 FileHeaderHelper(const char* archive_name, bool is_static) {
470 _fd = -1;
471 _is_valid = false;
472 _header = nullptr;
473 _base_archive_name = nullptr;
474 _archive_name = archive_name;
475 _is_static = is_static;
476 }
477
478 ~FileHeaderHelper() {
479 if (_header != nullptr) {
480 FREE_C_HEAP_ARRAY(_header);
481 }
482 if (_fd != -1) {
483 ::close(_fd);
484 }
485 }
486
487 bool initialize() {
488 assert(_archive_name != nullptr, "Archive name is null");
489 _fd = os::open(_archive_name, O_RDONLY | O_BINARY, 0);
490 if (_fd < 0) {
491 AOTMetaspace::report_loading_error("Specified %s not found (%s)", CDSConfig::type_of_archive_being_loaded(), _archive_name);
492 return false;
493 }
494 return initialize(_fd);
495 }
496
497 // for an already opened file, do not set _fd
498 bool initialize(int fd) {
499 assert(_archive_name != nullptr, "Archive name is null");
500 assert(fd != -1, "Archive must be opened already");
501 // First read the generic header so we know the exact size of the actual header.
502 const char* file_type = CDSConfig::type_of_archive_being_loaded();
503 GenericCDSFileMapHeader gen_header;
504 size_t size = sizeof(GenericCDSFileMapHeader);
505 os::lseek(fd, 0, SEEK_SET);
506 size_t n = ::read(fd, (void*)&gen_header, (unsigned int)size);
507 if (n != size) {
508 aot_log_warning(aot)("Unable to read generic CDS file map header from %s", file_type);
509 return false;
510 }
511
512 if (gen_header._magic != CDS_ARCHIVE_MAGIC &&
513 gen_header._magic != CDS_DYNAMIC_ARCHIVE_MAGIC &&
514 gen_header._magic != CDS_PREIMAGE_ARCHIVE_MAGIC) {
515 aot_log_warning(aot)("The %s has a bad magic number: %#x", file_type, gen_header._magic);
516 return false;
517 }
518
519 if (gen_header._version < CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION) {
520 aot_log_warning(aot)("Cannot handle %s version 0x%x. Must be at least 0x%x.",
521 file_type, gen_header._version, CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION);
522 return false;
523 }
524
525 if (gen_header._version != CURRENT_CDS_ARCHIVE_VERSION) {
526 aot_log_warning(aot)("The %s version 0x%x does not match the required version 0x%x.",
527 file_type, gen_header._version, CURRENT_CDS_ARCHIVE_VERSION);
528 }
529
530 size_t filelen = os::lseek(fd, 0, SEEK_END);
531 if (gen_header._header_size >= filelen) {
532 aot_log_warning(aot)("Archive file header larger than archive file");
533 return false;
534 }
535
536 // Read the actual header and perform more checks
537 size = gen_header._header_size;
538 _header = (GenericCDSFileMapHeader*)NEW_C_HEAP_ARRAY(char, size, mtInternal);
539 os::lseek(fd, 0, SEEK_SET);
540 n = ::read(fd, (void*)_header, (unsigned int)size);
541 if (n != size) {
542 aot_log_warning(aot)("Unable to read file map header from %s", file_type);
543 return false;
544 }
545
546 if (!check_header_crc()) {
547 return false;
548 }
549
550 if (!check_and_init_base_archive_name()) {
551 return false;
552 }
553
554 // All fields in the GenericCDSFileMapHeader has been validated.
555 _is_valid = true;
556 return true;
557 }
558
559 GenericCDSFileMapHeader* get_generic_file_header() {
560 assert(_header != nullptr && _is_valid, "must be a valid archive file");
561 return _header;
562 }
563
564 const char* base_archive_name() {
565 assert(_header != nullptr && _is_valid, "must be a valid archive file");
566 return _base_archive_name;
567 }
568
569 bool is_static_archive() const {
570 return _header->_magic == CDS_ARCHIVE_MAGIC;
571 }
572
573 bool is_dynamic_archive() const {
574 return _header->_magic == CDS_DYNAMIC_ARCHIVE_MAGIC;
575 }
576
577 bool is_preimage_static_archive() const {
578 return _header->_magic == CDS_PREIMAGE_ARCHIVE_MAGIC;
579 }
580
581 private:
582 bool check_header_crc() const {
583 if (VerifySharedSpaces) {
584 FileMapHeader* header = (FileMapHeader*)_header;
585 int actual_crc = header->compute_crc();
586 if (actual_crc != header->crc()) {
587 aot_log_info(aot)("_crc expected: %d", header->crc());
588 aot_log_info(aot)(" actual: %d", actual_crc);
589 aot_log_warning(aot)("Header checksum verification failed.");
590 return false;
591 }
592 }
593 return true;
594 }
595
596 bool check_and_init_base_archive_name() {
597 unsigned int name_offset = _header->_base_archive_name_offset;
598 unsigned int name_size = _header->_base_archive_name_size;
599 unsigned int header_size = _header->_header_size;
600
601 if (name_offset + name_size < name_offset) {
602 aot_log_warning(aot)("base_archive_name offset/size overflow: " UINT32_FORMAT "/" UINT32_FORMAT,
603 name_offset, name_size);
604 return false;
605 }
606
607 if (is_static_archive() || is_preimage_static_archive()) {
608 if (name_offset != 0) {
609 aot_log_warning(aot)("static shared archive must have zero _base_archive_name_offset");
610 return false;
611 }
612 if (name_size != 0) {
613 aot_log_warning(aot)("static shared archive must have zero _base_archive_name_size");
614 return false;
615 }
616 } else {
617 assert(is_dynamic_archive(), "must be");
618 if ((name_size == 0 && name_offset != 0) ||
619 (name_size != 0 && name_offset == 0)) {
620 // If either is zero, both must be zero. This indicates that we are using the default base archive.
621 aot_log_warning(aot)("Invalid base_archive_name offset/size: " UINT32_FORMAT "/" UINT32_FORMAT,
622 name_offset, name_size);
623 return false;
624 }
625 if (name_size > 0) {
626 if (name_offset + name_size > header_size) {
627 aot_log_warning(aot)("Invalid base_archive_name offset/size (out of range): "
628 UINT32_FORMAT " + " UINT32_FORMAT " > " UINT32_FORMAT ,
629 name_offset, name_size, header_size);
630 return false;
631 }
632 const char* name = ((const char*)_header) + _header->_base_archive_name_offset;
633 if (name[name_size - 1] != '\0' || strlen(name) != name_size - 1) {
634 aot_log_warning(aot)("Base archive name is damaged");
635 return false;
636 }
637 if (!os::file_exists(name)) {
638 aot_log_warning(aot)("Base archive %s does not exist", name);
639 return false;
640 }
641 _base_archive_name = name;
642 }
643 }
644
645 return true;
646 }
647 };
648
649 // Return value:
650 // false:
651 // <archive_name> is not a valid archive. *base_archive_name is set to null.
652 // true && (*base_archive_name) == nullptr:
653 // <archive_name> is a valid static archive.
654 // true && (*base_archive_name) != nullptr:
655 // <archive_name> is a valid dynamic archive.
656 bool FileMapInfo::get_base_archive_name_from_header(const char* archive_name,
657 const char** base_archive_name) {
658 FileHeaderHelper file_helper(archive_name, false);
659 *base_archive_name = nullptr;
660
661 if (!file_helper.initialize()) {
662 return false;
663 }
664 GenericCDSFileMapHeader* header = file_helper.get_generic_file_header();
665 switch (header->_magic) {
666 case CDS_PREIMAGE_ARCHIVE_MAGIC:
667 return false; // This is a binary config file, not a proper archive
668 case CDS_DYNAMIC_ARCHIVE_MAGIC:
669 break;
670 default:
671 assert(header->_magic == CDS_ARCHIVE_MAGIC, "must be");
672 if (AutoCreateSharedArchive) {
673 aot_log_warning(aot)("AutoCreateSharedArchive is ignored because %s is a static archive", archive_name);
674 }
675 return true;
676 }
677
678 const char* base = file_helper.base_archive_name();
679 if (base == nullptr) {
680 *base_archive_name = CDSConfig::default_archive_path();
681 } else {
682 *base_archive_name = os::strdup_check_oom(base);
683 }
684
685 return true;
686 }
687
688 bool FileMapInfo::is_preimage_static_archive(const char* file) {
689 FileHeaderHelper file_helper(file, false);
690 if (!file_helper.initialize()) {
691 return false;
692 }
693 return file_helper.is_preimage_static_archive();
694 }
695
696 // Read the FileMapInfo information from the file.
697
698 bool FileMapInfo::init_from_file(int fd) {
699 FileHeaderHelper file_helper(_full_path, _is_static);
700 if (!file_helper.initialize(fd)) {
701 aot_log_warning(aot)("Unable to read the file header.");
702 return false;
703 }
704 GenericCDSFileMapHeader* gen_header = file_helper.get_generic_file_header();
705
706 const char* file_type = CDSConfig::type_of_archive_being_loaded();
707 if (_is_static) {
708 if ((gen_header->_magic == CDS_ARCHIVE_MAGIC) ||
709 (gen_header->_magic == CDS_PREIMAGE_ARCHIVE_MAGIC && CDSConfig::is_dumping_final_static_archive())) {
710 // Good
711 } else {
712 if (CDSConfig::new_aot_flags_used()) {
713 aot_log_warning(aot)("Not a valid %s (%s)", file_type, _full_path);
714 } else {
715 aot_log_warning(aot)("Not a base shared archive: %s", _full_path);
716 }
717 return false;
718 }
719 } else {
720 if (gen_header->_magic != CDS_DYNAMIC_ARCHIVE_MAGIC) {
721 aot_log_warning(aot)("Not a top shared archive: %s", _full_path);
722 return false;
723 }
724 }
725
726 _header = (FileMapHeader*)os::malloc(gen_header->_header_size, mtInternal);
727 os::lseek(fd, 0, SEEK_SET); // reset to begin of the archive
728 size_t size = gen_header->_header_size;
729 size_t n = ::read(fd, (void*)_header, (unsigned int)size);
730 if (n != size) {
731 aot_log_warning(aot)("Failed to read file header from the top archive file\n");
732 return false;
733 }
734
735 if (header()->version() != CURRENT_CDS_ARCHIVE_VERSION) {
736 aot_log_info(aot)("_version expected: 0x%x", CURRENT_CDS_ARCHIVE_VERSION);
737 aot_log_info(aot)(" actual: 0x%x", header()->version());
738 aot_log_warning(aot)("The %s has the wrong version.", file_type);
739 return false;
740 }
741
742 unsigned int base_offset = header()->base_archive_name_offset();
743 unsigned int name_size = header()->base_archive_name_size();
744 unsigned int header_size = header()->header_size();
745 if (base_offset != 0 && name_size != 0) {
746 if (header_size != base_offset + name_size) {
747 aot_log_info(aot)("_header_size: " UINT32_FORMAT, header_size);
748 aot_log_info(aot)("base_archive_name_size: " UINT32_FORMAT, header()->base_archive_name_size());
749 aot_log_info(aot)("base_archive_name_offset: " UINT32_FORMAT, header()->base_archive_name_offset());
750 aot_log_warning(aot)("The %s has an incorrect header size.", file_type);
751 return false;
752 }
753 }
754
755 const char* actual_ident = header()->jvm_ident();
756
757 if (actual_ident[JVM_IDENT_MAX-1] != 0) {
758 aot_log_warning(aot)("JVM version identifier is corrupted.");
759 return false;
760 }
761
762 char expected_ident[JVM_IDENT_MAX];
763 get_header_version(expected_ident);
764 if (strncmp(actual_ident, expected_ident, JVM_IDENT_MAX-1) != 0) {
765 aot_log_info(aot)("_jvm_ident expected: %s", expected_ident);
766 aot_log_info(aot)(" actual: %s", actual_ident);
767 aot_log_warning(aot)("The %s was created by a different"
768 " version or build of HotSpot", file_type);
769 return false;
770 }
771
772 _file_offset = header()->header_size(); // accounts for the size of _base_archive_name
773
774 size_t len = os::lseek(fd, 0, SEEK_END);
775
776 for (int i = 0; i < AOTMetaspace::n_regions; i++) {
777 FileMapRegion* r = region_at(i);
778 if (r->file_offset() > len || len - r->file_offset() < r->used()) {
779 aot_log_warning(aot)("The %s has been truncated.", file_type);
780 return false;
781 }
782 }
783
784 if (!header()->check_must_match_flags()) {
785 return false;
786 }
787
788 return true;
789 }
790
791 void FileMapInfo::seek_to_position(size_t pos) {
792 if (os::lseek(_fd, (jlong)pos, SEEK_SET) < 0) {
793 aot_log_error(aot)("Unable to seek to position %zu (errno=%d: %s)", pos, errno, os::strerror(errno));
794 AOTMetaspace::unrecoverable_loading_error();
795 }
796 }
797
798 // Read the FileMapInfo information from the file.
799 bool FileMapInfo::open_for_read() {
800 if (_file_open) {
801 return true;
802 }
803 const char* file_type = CDSConfig::type_of_archive_being_loaded();
804 const char* info = CDSConfig::is_dumping_final_static_archive() ?
805 "AOTConfiguration file " : "";
806 aot_log_info(aot)("trying to map %s%s", info, _full_path);
807 int fd = os::open(_full_path, O_RDONLY | O_BINARY, 0);
808 if (fd < 0) {
809 if (errno == ENOENT) {
810 aot_log_info(aot)("Specified %s not found (%s)", file_type, _full_path);
811 } else {
812 aot_log_warning(aot)("Failed to open %s (%s)", file_type,
813 os::strerror(errno));
814 }
815 return false;
816 } else {
817 aot_log_info(aot)("Opened %s %s.", file_type, _full_path);
818 }
819
820 _fd = fd;
821 _file_open = true;
822 return true;
823 }
824
825 // Write the FileMapInfo information to the file.
826
827 void FileMapInfo::open_as_output() {
828 if (CDSConfig::new_aot_flags_used()) {
829 if (CDSConfig::is_dumping_preimage_static_archive()) {
830 log_info(aot)("Writing binary AOTConfiguration file: %s", _full_path);
831 } else {
832 log_info(aot)("Writing AOTCache file: %s", _full_path);
833 }
834 } else {
835 aot_log_info(aot)("Dumping shared data to file: %s", _full_path);
836 }
837
838 #ifdef _WINDOWS // On Windows, need WRITE permission to remove the file.
839 chmod(_full_path, _S_IREAD | _S_IWRITE);
840 #endif
841
842 // Use remove() to delete the existing file because, on Unix, this will
843 // allow processes that have it open continued access to the file.
844 remove(_full_path);
845 int fd = os::open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0666);
846 if (fd < 0) {
847 aot_log_error(aot)("Unable to create %s %s: (%s).", CDSConfig::type_of_archive_being_written(), _full_path,
848 os::strerror(errno));
849 AOTMetaspace::writing_error();
850 return;
851 }
852 _fd = fd;
853 _file_open = true;
854 }
855
856 void FileMapInfo::prepare_for_writing() {
857 // Seek past the header. We will write the header after all regions are written
858 // and their CRCs computed.
859 size_t header_bytes = header()->header_size();
860
861 header_bytes = align_up(header_bytes, AOTMetaspace::core_region_alignment());
862 _file_offset = header_bytes;
863 seek_to_position(_file_offset);
864 }
865
866 // Write the header to the file, seek to the next allocation boundary.
867
868 void FileMapInfo::write_header() {
869 _file_offset = 0;
870 seek_to_position(_file_offset);
871 assert(is_file_position_aligned(), "must be");
872 write_bytes(header(), header()->header_size());
873 }
874
875 size_t FileMapRegion::used_aligned() const {
876 return align_up(used(), AOTMetaspace::core_region_alignment());
877 }
878
879 void FileMapRegion::init(int region_index, size_t mapping_offset, size_t size, bool read_only,
880 bool allow_exec, int crc) {
881 _is_heap_region = HeapShared::is_heap_region(region_index);
882 _is_bitmap_region = (region_index == AOTMetaspace::bm);
883 _mapping_offset = mapping_offset;
884 _used = size;
885 _read_only = read_only;
886 _allow_exec = allow_exec;
887 _crc = crc;
888 _mapped_from_file = false;
889 _mapped_base = nullptr;
890 _in_reserved_space = false;
891 }
892
893 void FileMapRegion::init_oopmap(size_t offset, size_t size_in_bits) {
894 _oopmap_offset = offset;
895 _oopmap_size_in_bits = size_in_bits;
896 }
897
898 void FileMapRegion::init_ptrmap(size_t offset, size_t size_in_bits) {
899 _ptrmap_offset = offset;
900 _ptrmap_size_in_bits = size_in_bits;
901 }
902
903 bool FileMapRegion::check_region_crc(char* base) const {
904 // This function should be called after the region has been properly
905 // loaded into memory via FileMapInfo::map_region() or FileMapInfo::read_region().
906 // I.e., this->mapped_base() must be valid.
907 size_t sz = used();
908 if (sz == 0) {
909 return true;
910 }
911
912 assert(base != nullptr, "must be initialized");
913 int crc = ClassLoader::crc32(0, base, (jint)sz);
914 if (crc != this->crc()) {
915 aot_log_warning(aot)("Checksum verification failed.");
916 return false;
917 }
918 return true;
919 }
920
921 static const char* region_name(int region_index) {
922 static const char* names[] = {
923 "rw", "ro", "bm", "hp", "ac"
924 };
925 const int num_regions = sizeof(names)/sizeof(names[0]);
926 assert(0 <= region_index && region_index < num_regions, "sanity");
927
928 return names[region_index];
929 }
930
931 BitMapView FileMapInfo::bitmap_view(int region_index, bool is_oopmap) {
932 FileMapRegion* r = region_at(region_index);
933 char* bitmap_base = is_static() ? FileMapInfo::current_info()->map_bitmap_region() : FileMapInfo::dynamic_info()->map_bitmap_region();
934 bitmap_base += is_oopmap ? r->oopmap_offset() : r->ptrmap_offset();
935 size_t size_in_bits = is_oopmap ? r->oopmap_size_in_bits() : r->ptrmap_size_in_bits();
936
937 aot_log_debug(aot, reloc)("mapped %s relocation %smap @ " INTPTR_FORMAT " (%zu bits)",
938 region_name(region_index), is_oopmap ? "oop" : "ptr",
939 p2i(bitmap_base), size_in_bits);
940
941 return BitMapView((BitMap::bm_word_t*)(bitmap_base), size_in_bits);
942 }
943
944 BitMapView FileMapInfo::oopmap_view(int region_index) {
945 return bitmap_view(region_index, /*is_oopmap*/true);
946 }
947
948 BitMapView FileMapInfo::ptrmap_view(int region_index) {
949 return bitmap_view(region_index, /*is_oopmap*/false);
950 }
951
952 void FileMapRegion::print(outputStream* st, int region_index) {
953 st->print_cr("============ region ============= %d \"%s\"", region_index, region_name(region_index));
954 st->print_cr("- crc: 0x%08x", _crc);
955 st->print_cr("- read_only: %d", _read_only);
956 st->print_cr("- allow_exec: %d", _allow_exec);
957 st->print_cr("- is_heap_region: %d", _is_heap_region);
958 st->print_cr("- is_bitmap_region: %d", _is_bitmap_region);
959 st->print_cr("- mapped_from_file: %d", _mapped_from_file);
960 st->print_cr("- file_offset: 0x%zx", _file_offset);
961 st->print_cr("- mapping_offset: 0x%zx", _mapping_offset);
962 st->print_cr("- used: %zu", _used);
963 st->print_cr("- oopmap_offset: 0x%zx", _oopmap_offset);
964 st->print_cr("- oopmap_size_in_bits: %zu", _oopmap_size_in_bits);
965 st->print_cr("- ptrmap_offset: 0x%zx", _ptrmap_offset);
966 st->print_cr("- ptrmap_size_in_bits: %zu", _ptrmap_size_in_bits);
967 st->print_cr("- mapped_base: " INTPTR_FORMAT, p2i(_mapped_base));
968 }
969
970 void FileMapInfo::write_region(int region, char* base, size_t size,
971 bool read_only, bool allow_exec) {
972 assert(CDSConfig::is_dumping_archive(), "sanity");
973
974 FileMapRegion* r = region_at(region);
975 char* requested_base;
976 size_t mapping_offset = 0;
977
978 if (region == AOTMetaspace::bm) {
979 requested_base = nullptr; // always null for bm region
980 } else if (size == 0) {
981 // This is an unused region (e.g., a heap region when !INCLUDE_CDS_JAVA_HEAP)
982 requested_base = nullptr;
983 } else if (HeapShared::is_heap_region(region)) {
984 assert(CDSConfig::is_dumping_heap(), "sanity");
985 #if INCLUDE_CDS_JAVA_HEAP
986 assert(!CDSConfig::is_dumping_dynamic_archive(), "must be");
987 if (HeapShared::is_writing_mapping_mode()) {
988 requested_base = (char*)AOTMappedHeapWriter::requested_address();
989 if (UseCompressedOops) {
990 mapping_offset = (size_t)((address)requested_base - AOTMappedHeapWriter::narrow_oop_base());
991 assert((mapping_offset >> CompressedOops::shift()) << CompressedOops::shift() == mapping_offset, "must be");
992 }
993 } else {
994 requested_base = nullptr;
995 }
996 #endif // INCLUDE_CDS_JAVA_HEAP
997 } else {
998 char* requested_SharedBaseAddress = (char*)AOTMetaspace::requested_base_address();
999 requested_base = ArchiveBuilder::current()->to_requested(base);
1000 assert(requested_base >= requested_SharedBaseAddress, "must be");
1001 mapping_offset = requested_base - requested_SharedBaseAddress;
1002 }
1003
1004 r->set_file_offset(_file_offset);
1005 int crc = ClassLoader::crc32(0, base, (jint)size);
1006 if (size > 0) {
1007 aot_log_info(aot)("Shared file region (%s) %d: %8zu"
1008 " bytes, addr " INTPTR_FORMAT " file offset 0x%08" PRIxPTR
1009 " crc 0x%08x",
1010 region_name(region), region, size, p2i(requested_base), _file_offset, crc);
1011 } else {
1012 aot_log_info(aot)("Shared file region (%s) %d: %8zu"
1013 " bytes", region_name(region), region, size);
1014 }
1015
1016 r->init(region, mapping_offset, size, read_only, allow_exec, crc);
1017
1018 if (base != nullptr) {
1019 write_bytes_aligned(base, size);
1020 }
1021 }
1022
1023 static size_t write_bitmap(const CHeapBitMap* map, char* output, size_t offset) {
1024 size_t size_in_bytes = map->size_in_bytes();
1025 map->write_to((BitMap::bm_word_t*)(output + offset), size_in_bytes);
1026 return offset + size_in_bytes;
1027 }
1028
1029 // The sorting code groups the objects with non-null oop/ptrs together.
1030 // Relevant bitmaps then have lots of leading and trailing zeros, which
1031 // we do not have to store.
1032 size_t FileMapInfo::remove_bitmap_zeros(CHeapBitMap* map) {
1033 BitMap::idx_t first_set = map->find_first_set_bit(0);
1034 BitMap::idx_t last_set = map->find_last_set_bit(0);
1035 size_t old_size = map->size();
1036
1037 // Slice and resize bitmap
1038 map->truncate(first_set, last_set + 1);
1039
1040 assert(map->at(0), "First bit should be set");
1041 assert(map->at(map->size() - 1), "Last bit should be set");
1042 assert(map->size() <= old_size, "sanity");
1043
1044 return first_set;
1045 }
1046
1047 char* FileMapInfo::write_bitmap_region(CHeapBitMap* rw_ptrmap,
1048 CHeapBitMap* ro_ptrmap,
1049 AOTMappedHeapInfo* mapped_heap_info,
1050 AOTStreamedHeapInfo* streamed_heap_info,
1051 size_t &size_in_bytes) {
1052 size_t removed_rw_leading_zeros = remove_bitmap_zeros(rw_ptrmap);
1053 size_t removed_ro_leading_zeros = remove_bitmap_zeros(ro_ptrmap);
1054 header()->set_rw_ptrmap_start_pos(removed_rw_leading_zeros);
1055 header()->set_ro_ptrmap_start_pos(removed_ro_leading_zeros);
1056 size_in_bytes = rw_ptrmap->size_in_bytes() + ro_ptrmap->size_in_bytes();
1057
1058 if (mapped_heap_info != nullptr && mapped_heap_info->is_used()) {
1059 // Remove leading and trailing zeros
1060 assert(HeapShared::is_writing_mapping_mode(), "unexpected dumping mode");
1061 size_t removed_oop_leading_zeros = remove_bitmap_zeros(mapped_heap_info->oopmap());
1062 size_t removed_ptr_leading_zeros = remove_bitmap_zeros(mapped_heap_info->ptrmap());
1063 mapped_heap_info->set_oopmap_start_pos(removed_oop_leading_zeros);
1064 mapped_heap_info->set_ptrmap_start_pos(removed_ptr_leading_zeros);
1065
1066 size_in_bytes += mapped_heap_info->oopmap()->size_in_bytes();
1067 size_in_bytes += mapped_heap_info->ptrmap()->size_in_bytes();
1068 } else if (streamed_heap_info != nullptr && streamed_heap_info->is_used()) {
1069 assert(HeapShared::is_writing_streaming_mode(), "unexpected dumping mode");
1070
1071 size_in_bytes += streamed_heap_info->oopmap()->size_in_bytes();
1072 }
1073
1074 // The bitmap region contains up to 4 parts:
1075 // rw_ptrmap: metaspace pointers inside the read-write region
1076 // ro_ptrmap: metaspace pointers inside the read-only region
1077 // *_heap_info->oopmap(): Java oop pointers in the heap region
1078 // mapped_heap_info->ptrmap(): metaspace pointers in the heap region
1079 char* buffer = NEW_C_HEAP_ARRAY(char, size_in_bytes, mtClassShared);
1080 size_t written = 0;
1081
1082 region_at(AOTMetaspace::rw)->init_ptrmap(0, rw_ptrmap->size());
1083 written = write_bitmap(rw_ptrmap, buffer, written);
1084
1085 region_at(AOTMetaspace::ro)->init_ptrmap(written, ro_ptrmap->size());
1086 written = write_bitmap(ro_ptrmap, buffer, written);
1087
1088 if (mapped_heap_info != nullptr && mapped_heap_info->is_used()) {
1089 assert(HeapShared::is_writing_mapping_mode(), "unexpected dumping mode");
1090 FileMapRegion* r = region_at(AOTMetaspace::hp);
1091
1092 r->init_oopmap(written, mapped_heap_info->oopmap()->size());
1093 written = write_bitmap(mapped_heap_info->oopmap(), buffer, written);
1094
1095 r->init_ptrmap(written, mapped_heap_info->ptrmap()->size());
1096 written = write_bitmap(mapped_heap_info->ptrmap(), buffer, written);
1097 } else if (streamed_heap_info != nullptr && streamed_heap_info->is_used()) {
1098 assert(HeapShared::is_writing_streaming_mode(), "unexpected dumping mode");
1099 FileMapRegion* r = region_at(AOTMetaspace::hp);
1100
1101 r->init_oopmap(written, streamed_heap_info->oopmap()->size());
1102 written = write_bitmap(streamed_heap_info->oopmap(), buffer, written);
1103 }
1104
1105 write_region(AOTMetaspace::bm, (char*)buffer, size_in_bytes, /*read_only=*/true, /*allow_exec=*/false);
1106 return buffer;
1107 }
1108
1109 #if INCLUDE_CDS_JAVA_HEAP
1110 size_t FileMapInfo::write_mapped_heap_region(AOTMappedHeapInfo* heap_info) {
1111 char* buffer_start = heap_info->buffer_start();
1112 size_t buffer_size = heap_info->buffer_byte_size();
1113 write_region(AOTMetaspace::hp, buffer_start, buffer_size, false, false);
1114 header()->set_mapped_heap_header(heap_info->create_header());
1115 return buffer_size;
1116 }
1117
1118 size_t FileMapInfo::write_streamed_heap_region(AOTStreamedHeapInfo* heap_info) {
1119 char* buffer_start = heap_info->buffer_start();
1120 size_t buffer_size = heap_info->buffer_byte_size();
1121 write_region(AOTMetaspace::hp, buffer_start, buffer_size, true, false);
1122 header()->set_streamed_heap_header(heap_info->create_header());
1123 return buffer_size;
1124 }
1125 #endif // INCLUDE_CDS_JAVA_HEAP
1126
1127 // Dump bytes to file -- at the current file position.
1128
1129 void FileMapInfo::write_bytes(const void* buffer, size_t nbytes) {
1130 assert(_file_open, "must be");
1131 if (!os::write(_fd, buffer, nbytes)) {
1132 // If the shared archive is corrupted, close it and remove it.
1133 close();
1134 remove(_full_path);
1135
1136 if (CDSConfig::is_dumping_preimage_static_archive()) {
1137 AOTMetaspace::writing_error("Unable to write to AOT configuration file.");
1138 } else if (CDSConfig::new_aot_flags_used()) {
1139 AOTMetaspace::writing_error("Unable to write to AOT cache.");
1140 } else {
1141 AOTMetaspace::writing_error("Unable to write to shared archive.");
1142 }
1143 }
1144 _file_offset += nbytes;
1145 }
1146
1147 bool FileMapInfo::is_file_position_aligned() const {
1148 return _file_offset == align_up(_file_offset,
1149 AOTMetaspace::core_region_alignment());
1150 }
1151
1152 // Align file position to an allocation unit boundary.
1153
1154 void FileMapInfo::align_file_position() {
1155 assert(_file_open, "must be");
1156 size_t new_file_offset = align_up(_file_offset,
1157 AOTMetaspace::core_region_alignment());
1158 if (new_file_offset != _file_offset) {
1159 _file_offset = new_file_offset;
1160 // Seek one byte back from the target and write a byte to insure
1161 // that the written file is the correct length.
1162 _file_offset -= 1;
1163 seek_to_position(_file_offset);
1164 char zero = 0;
1165 write_bytes(&zero, 1);
1166 }
1167 }
1168
1169
1170 // Dump bytes to file -- at the current file position.
1171
1172 void FileMapInfo::write_bytes_aligned(const void* buffer, size_t nbytes) {
1173 align_file_position();
1174 write_bytes(buffer, nbytes);
1175 align_file_position();
1176 }
1177
1178 // Close the shared archive file. This does NOT unmap mapped regions.
1179
1180 void FileMapInfo::close() {
1181 if (_file_open) {
1182 if (::close(_fd) < 0) {
1183 AOTMetaspace::unrecoverable_loading_error("Unable to close the shared archive file.");
1184 }
1185 _file_open = false;
1186 _fd = -1;
1187 }
1188 }
1189
1190 /*
1191 * Same as os::map_memory() but also pretouches if AlwaysPreTouch is enabled.
1192 */
1193 static char* map_memory(int fd, const char* file_name, size_t file_offset,
1194 char* addr, size_t bytes, bool read_only,
1195 bool allow_exec, MemTag mem_tag) {
1196 char* mem = os::map_memory(fd, file_name, file_offset, addr, bytes,
1197 mem_tag, AlwaysPreTouch ? false : read_only,
1198 allow_exec);
1199 if (mem != nullptr && AlwaysPreTouch) {
1200 os::pretouch_memory(mem, mem + bytes);
1201 }
1202 return mem;
1203 }
1204
1205 char* FileMapInfo::map_heap_region(FileMapRegion* r, char* addr, size_t bytes) {
1206 return ::map_memory(_fd,
1207 _full_path,
1208 r->file_offset(),
1209 addr,
1210 bytes,
1211 r->read_only(),
1212 r->allow_exec(),
1213 mtJavaHeap);
1214 }
1215
1216 // JVM/TI RedefineClasses() support:
1217 // Remap the shared readonly space to shared readwrite, private.
1218 bool FileMapInfo::remap_shared_readonly_as_readwrite() {
1219 int idx = AOTMetaspace::ro;
1220 FileMapRegion* r = region_at(idx);
1221 if (!r->read_only()) {
1222 // the space is already readwrite so we are done
1223 return true;
1224 }
1225 size_t size = r->used_aligned();
1226 if (!open_for_read()) {
1227 return false;
1228 }
1229 char *addr = r->mapped_base();
1230 // This path should not be reached for Windows; see JDK-8222379.
1231 assert(WINDOWS_ONLY(false) NOT_WINDOWS(true), "Don't call on Windows");
1232 // Replace old mapping with new one that is writable.
1233 char *base = os::map_memory(_fd, _full_path, r->file_offset(),
1234 addr, size, mtNone, false /* !read_only */,
1235 r->allow_exec());
1236 close();
1237 // These have to be errors because the shared region is now unmapped.
1238 if (base == nullptr) {
1239 aot_log_error(aot)("Unable to remap shared readonly space (errno=%d).", errno);
1240 vm_exit(1);
1241 }
1242 if (base != addr) {
1243 aot_log_error(aot)("Unable to remap shared readonly space (errno=%d).", errno);
1244 vm_exit(1);
1245 }
1246 r->set_read_only(false);
1247 return true;
1248 }
1249
1250 // Memory map a region in the address space.
1251 static const char* shared_region_name[] = { "ReadWrite", "ReadOnly", "Bitmap", "Heap", "Code" };
1252
1253 MapArchiveResult FileMapInfo::map_regions(int regions[], int num_regions, char* mapped_base_address, ReservedSpace rs) {
1254 DEBUG_ONLY(FileMapRegion* last_region = nullptr);
1255 intx addr_delta = mapped_base_address - header()->requested_base_address();
1256
1257 // Make sure we don't attempt to use header()->mapped_base_address() unless
1258 // it's been successfully mapped.
1259 DEBUG_ONLY(header()->set_mapped_base_address((char*)(uintptr_t)0xdeadbeef);)
1260
1261 for (int i = 0; i < num_regions; i++) {
1262 int idx = regions[i];
1263 MapArchiveResult result = map_region(idx, addr_delta, mapped_base_address, rs);
1264 if (result != MAP_ARCHIVE_SUCCESS) {
1265 return result;
1266 }
1267 FileMapRegion* r = region_at(idx);
1268 DEBUG_ONLY(if (last_region != nullptr) {
1269 // Ensure that the OS won't be able to allocate new memory spaces between any mapped
1270 // regions, or else it would mess up the simple comparison in MetaspaceObj::in_aot_cache().
1271 assert(r->mapped_base() == last_region->mapped_end(), "must have no gaps");
1272 }
1273 last_region = r;)
1274 aot_log_info(aot)("Mapped %s region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)", is_static() ? "static " : "dynamic",
1275 idx, p2i(r->mapped_base()), p2i(r->mapped_end()),
1276 shared_region_name[idx]);
1277
1278 }
1279
1280 header()->set_mapped_base_address(header()->requested_base_address() + addr_delta);
1281 if (addr_delta != 0 && !relocate_pointers_in_core_regions(addr_delta)) {
1282 return MAP_ARCHIVE_OTHER_FAILURE;
1283 }
1284
1285 return MAP_ARCHIVE_SUCCESS;
1286 }
1287
1288 bool FileMapInfo::read_region(int i, char* base, size_t size, bool do_commit) {
1289 FileMapRegion* r = region_at(i);
1290 if (do_commit) {
1291 aot_log_info(aot)("Commit %s region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)%s",
1292 is_static() ? "static " : "dynamic", i, p2i(base), p2i(base + size),
1293 shared_region_name[i], r->allow_exec() ? " exec" : "");
1294 if (!os::commit_memory(base, size, r->allow_exec())) {
1295 aot_log_error(aot)("Failed to commit %s region #%d (%s)", is_static() ? "static " : "dynamic",
1296 i, shared_region_name[i]);
1297 return false;
1298 }
1299 }
1300 if (os::lseek(_fd, (long)r->file_offset(), SEEK_SET) != (int)r->file_offset() ||
1301 read_bytes(base, size) != size) {
1302 return false;
1303 }
1304
1305 if (VerifySharedSpaces && !r->check_region_crc(base)) {
1306 return false;
1307 }
1308
1309 r->set_mapped_from_file(false);
1310 r->set_mapped_base(base);
1311
1312 return true;
1313 }
1314
1315 MapArchiveResult FileMapInfo::map_region(int i, intx addr_delta, char* mapped_base_address, ReservedSpace rs) {
1316 assert(!HeapShared::is_heap_region(i), "sanity");
1317 FileMapRegion* r = region_at(i);
1318 size_t size = r->used_aligned();
1319 char *requested_addr = mapped_base_address + r->mapping_offset();
1320 assert(!is_mapped(), "must be not mapped yet");
1321 assert(requested_addr != nullptr, "must be specified");
1322
1323 r->set_mapped_from_file(false);
1324 r->set_in_reserved_space(false);
1325
1326 if (AOTMetaspace::use_windows_memory_mapping()) {
1327 // Windows cannot remap read-only shared memory to read-write when required for
1328 // RedefineClasses, which is also used by JFR. Always map windows regions as RW.
1329 r->set_read_only(false);
1330 } else if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space() ||
1331 Arguments::has_jfr_option()) {
1332 // If a tool agent is in use (debugging enabled), or JFR, we must map the address space RW
1333 r->set_read_only(false);
1334 } else if (addr_delta != 0) {
1335 r->set_read_only(false); // Need to patch the pointers
1336 }
1337
1338 if (AOTMetaspace::use_windows_memory_mapping() && rs.is_reserved()) {
1339 // This is the second time we try to map the archive(s). We have already created a ReservedSpace
1340 // that covers all the FileMapRegions to ensure all regions can be mapped. However, Windows
1341 // can't mmap into a ReservedSpace, so we just ::read() the data. We're going to patch all the
1342 // regions anyway, so there's no benefit for mmap anyway.
1343 if (!read_region(i, requested_addr, size, /* do_commit = */ true)) {
1344 AOTMetaspace::report_loading_error("Failed to read %s shared space into reserved space at " INTPTR_FORMAT,
1345 shared_region_name[i], p2i(requested_addr));
1346 return MAP_ARCHIVE_OTHER_FAILURE; // oom or I/O error.
1347 } else {
1348 assert(r->mapped_base() != nullptr, "must be initialized");
1349 }
1350 } else {
1351 // Note that this may either be a "fresh" mapping into unreserved address
1352 // space (Windows, first mapping attempt), or a mapping into pre-reserved
1353 // space (Posix). See also comment in AOTMetaspace::map_archives().
1354 char* base = map_memory(_fd, _full_path, r->file_offset(),
1355 requested_addr, size, r->read_only(),
1356 r->allow_exec(), mtClassShared);
1357 if (base != requested_addr) {
1358 AOTMetaspace::report_loading_error("Unable to map %s shared space at " INTPTR_FORMAT,
1359 shared_region_name[i], p2i(requested_addr));
1360 _memory_mapping_failed = true;
1361 return MAP_ARCHIVE_MMAP_FAILURE;
1362 }
1363
1364 if (VerifySharedSpaces && !r->check_region_crc(requested_addr)) {
1365 return MAP_ARCHIVE_OTHER_FAILURE;
1366 }
1367
1368 r->set_mapped_from_file(true);
1369 r->set_mapped_base(requested_addr);
1370 }
1371
1372 if (rs.is_reserved()) {
1373 char* mapped_base = r->mapped_base();
1374 assert(rs.base() <= mapped_base && mapped_base + size <= rs.end(),
1375 PTR_FORMAT " <= " PTR_FORMAT " < " PTR_FORMAT " <= " PTR_FORMAT,
1376 p2i(rs.base()), p2i(mapped_base), p2i(mapped_base + size), p2i(rs.end()));
1377 r->set_in_reserved_space(rs.is_reserved());
1378 }
1379 return MAP_ARCHIVE_SUCCESS;
1380 }
1381
1382 // The return value is the location of the archive relocation bitmap.
1383 char* FileMapInfo::map_auxiliary_region(int region_index, bool read_only) {
1384 FileMapRegion* r = region_at(region_index);
1385 if (r->mapped_base() != nullptr) {
1386 return r->mapped_base();
1387 }
1388 const char* region_name = shared_region_name[region_index];
1389 bool allow_exec = false;
1390 char* requested_addr = nullptr; // allow OS to pick any location
1391 char* mapped_base = map_memory(_fd, _full_path, r->file_offset(),
1392 requested_addr, r->used_aligned(), read_only, allow_exec, mtClassShared);
1393 if (mapped_base == nullptr) {
1394 AOTMetaspace::report_loading_error("failed to map %d region", region_index);
1395 return nullptr;
1396 }
1397
1398 if (VerifySharedSpaces && !r->check_region_crc(mapped_base)) {
1399 aot_log_error(aot)("region %d CRC error", region_index);
1400 os::unmap_memory(mapped_base, r->used_aligned());
1401 return nullptr;
1402 }
1403
1404 r->set_mapped_from_file(true);
1405 r->set_mapped_base(mapped_base);
1406 aot_log_info(aot)("Mapped %s region #%d at base %zu top %zu (%s)",
1407 is_static() ? "static " : "dynamic",
1408 region_index, p2i(r->mapped_base()), p2i(r->mapped_end()),
1409 region_name);
1410 return mapped_base;
1411 }
1412
1413 char* FileMapInfo::map_bitmap_region() {
1414 return map_auxiliary_region(AOTMetaspace::bm, false);
1415 }
1416
1417 bool FileMapInfo::map_aot_code_region(ReservedSpace rs) {
1418 FileMapRegion* r = region_at(AOTMetaspace::ac);
1419 assert(r->used() > 0 && r->used_aligned() == rs.size(), "must be");
1420
1421 if (UseCompressedOops) {
1422 precond(header()->compatible_oop_compression() == AOTCompatibleOopCompression);
1423 }
1424
1425 char* requested_base = rs.base();
1426 assert(requested_base != nullptr, "should be inside code cache");
1427
1428 char* mapped_base;
1429 if (AOTMetaspace::use_windows_memory_mapping()) {
1430 if (!read_region(AOTMetaspace::ac, requested_base, r->used_aligned(), /* do_commit = */ true)) {
1431 AOTMetaspace::report_loading_error("Failed to read aot code shared space into reserved space at " INTPTR_FORMAT,
1432 p2i(requested_base));
1433 return false;
1434 }
1435 mapped_base = requested_base;
1436 } else {
1437 // We do not execute in-place in the AOT code region.
1438 // AOT code is copied to the CodeCache for execution.
1439 bool read_only = false, allow_exec = false;
1440 mapped_base = map_memory(_fd, _full_path, r->file_offset(),
1441 requested_base, r->used_aligned(), read_only, allow_exec, mtClassShared);
1442 }
1443 if (mapped_base == nullptr) {
1444 AOTMetaspace::report_loading_error("failed to map aot code region");
1445 return false;
1446 } else {
1447 assert(mapped_base == requested_base, "must be");
1448
1449 if (VerifySharedSpaces && !r->check_region_crc(mapped_base)) {
1450 aot_log_error(aot)("region %d CRC error", AOTMetaspace::ac);
1451 os::unmap_memory(mapped_base, r->used_aligned());
1452 return false;
1453 }
1454
1455 r->set_mapped_from_file(true);
1456 r->set_mapped_base(mapped_base);
1457 aot_log_info(aot)("Mapped static region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)",
1458 AOTMetaspace::ac, p2i(r->mapped_base()), p2i(r->mapped_end()),
1459 shared_region_name[AOTMetaspace::ac]);
1460 return true;
1461 }
1462 }
1463
1464 class SharedDataRelocationTask : public ArchiveWorkerTask {
1465 private:
1466 BitMapView* const _rw_bm;
1467 BitMapView* const _ro_bm;
1468 SharedDataRelocator* const _rw_reloc;
1469 SharedDataRelocator* const _ro_reloc;
1470
1471 public:
1472 SharedDataRelocationTask(BitMapView* rw_bm, BitMapView* ro_bm, SharedDataRelocator* rw_reloc, SharedDataRelocator* ro_reloc) :
1473 ArchiveWorkerTask("Shared Data Relocation"),
1474 _rw_bm(rw_bm), _ro_bm(ro_bm), _rw_reloc(rw_reloc), _ro_reloc(ro_reloc) {}
1475
1476 void work(int chunk, int max_chunks) override {
1477 work_on(chunk, max_chunks, _rw_bm, _rw_reloc);
1478 work_on(chunk, max_chunks, _ro_bm, _ro_reloc);
1479 }
1480
1481 void work_on(int chunk, int max_chunks, BitMapView* bm, SharedDataRelocator* reloc) {
1482 BitMap::idx_t size = bm->size();
1483 BitMap::idx_t start = MIN2(size, size * chunk / max_chunks);
1484 BitMap::idx_t end = MIN2(size, size * (chunk + 1) / max_chunks);
1485 assert(end > start, "Sanity: no empty slices");
1486 bm->iterate(reloc, start, end);
1487 }
1488 };
1489
1490 // This is called when we cannot map the archive at the requested[ base address (usually 0x800000000).
1491 // We relocate all pointers in the 2 core regions (ro, rw).
1492 bool FileMapInfo::relocate_pointers_in_core_regions(intx addr_delta) {
1493 aot_log_debug(aot, reloc)("runtime archive relocation start");
1494 char* bitmap_base = map_bitmap_region();
1495
1496 if (bitmap_base == nullptr) {
1497 return false; // OOM, or CRC check failure
1498 } else {
1499 BitMapView rw_ptrmap = ptrmap_view(AOTMetaspace::rw);
1500 BitMapView ro_ptrmap = ptrmap_view(AOTMetaspace::ro);
1501
1502 FileMapRegion* rw_region = first_core_region();
1503 FileMapRegion* ro_region = last_core_region();
1504
1505 // Patch all pointers inside the RW region
1506 address rw_patch_base = (address)rw_region->mapped_base();
1507 address rw_patch_end = (address)rw_region->mapped_end();
1508
1509 // Patch all pointers inside the RO region
1510 address ro_patch_base = (address)ro_region->mapped_base();
1511 address ro_patch_end = (address)ro_region->mapped_end();
1512
1513 // the current value of the pointers to be patched must be within this
1514 // range (i.e., must be between the requested base address and the address of the current archive).
1515 // Note: top archive may point to objects in the base archive, but not the other way around.
1516 address valid_old_base = (address)header()->requested_base_address();
1517 address valid_old_end = valid_old_base + mapping_end_offset();
1518
1519 // after patching, the pointers must point inside this range
1520 // (the requested location of the archive, as mapped at runtime).
1521 address valid_new_base = (address)header()->mapped_base_address();
1522 address valid_new_end = (address)mapped_end();
1523
1524 SharedDataRelocator rw_patcher((address*)rw_patch_base + header()->rw_ptrmap_start_pos(), (address*)rw_patch_end, valid_old_base, valid_old_end,
1525 valid_new_base, valid_new_end, addr_delta);
1526 SharedDataRelocator ro_patcher((address*)ro_patch_base + header()->ro_ptrmap_start_pos(), (address*)ro_patch_end, valid_old_base, valid_old_end,
1527 valid_new_base, valid_new_end, addr_delta);
1528
1529 if (AOTCacheParallelRelocation) {
1530 ArchiveWorkers workers;
1531 SharedDataRelocationTask task(&rw_ptrmap, &ro_ptrmap, &rw_patcher, &ro_patcher);
1532 workers.run_task(&task);
1533 } else {
1534 rw_ptrmap.iterate(&rw_patcher);
1535 ro_ptrmap.iterate(&ro_patcher);
1536 }
1537
1538 // The AOTMetaspace::bm region will be unmapped in AOTMetaspace::initialize_shared_spaces().
1539
1540 aot_log_debug(aot, reloc)("runtime archive relocation done");
1541 return true;
1542 }
1543 }
1544
1545 size_t FileMapInfo::read_bytes(void* buffer, size_t count) {
1546 assert(_file_open, "Archive file is not open");
1547 size_t n = ::read(_fd, buffer, (unsigned int)count);
1548 if (n != count) {
1549 // Close the file if there's a problem reading it.
1550 close();
1551 return 0;
1552 }
1553 _file_offset += count;
1554 return count;
1555 }
1556
1557 // Get the total size in bytes of all mapped read only region
1558 size_t FileMapInfo::readonly_total() {
1559 size_t total = 0;
1560 if (current_info() != nullptr && current_info()->is_mapped()) {
1561 FileMapRegion* r = FileMapInfo::current_info()->region_at(AOTMetaspace::ro);
1562 if (r->read_only()) total += r->used();
1563 }
1564 if (dynamic_info() != nullptr && current_info()->is_mapped()) {
1565 FileMapRegion* r = FileMapInfo::dynamic_info()->region_at(AOTMetaspace::ro);
1566 if (r->read_only()) total += r->used();
1567 }
1568 return total;
1569 }
1570
1571 #if INCLUDE_CDS_JAVA_HEAP
1572
1573 bool FileMapInfo::has_heap_region() {
1574 return (region_at(AOTMetaspace::hp)->used() > 0);
1575 }
1576
1577 static void on_heap_region_loading_error() {
1578 if (CDSConfig::is_using_aot_linked_classes()) {
1579 // It's too late to recover -- we have already committed to use the archived metaspace objects, but
1580 // the archived heap objects cannot be loaded, so we don't have the archived FMG to guarantee that
1581 // all AOT-linked classes are visible.
1582 //
1583 // We get here because the heap is too small. The app will fail anyway. So let's quit.
1584 aot_log_error(aot)("%s has aot-linked classes but the archived "
1585 "heap objects cannot be loaded. Try increasing your heap size.",
1586 CDSConfig::type_of_archive_being_loaded());
1587 AOTMetaspace::unrecoverable_loading_error();
1588 }
1589 CDSConfig::stop_using_full_module_graph();
1590 }
1591
1592 void FileMapInfo::stream_heap_region() {
1593 assert(object_streaming_mode(), "This should only be done for the streaming approach");
1594
1595 if (map_auxiliary_region(AOTMetaspace::hp, /*readonly=*/true) != nullptr) {
1596 HeapShared::initialize_streaming();
1597 } else {
1598 on_heap_region_loading_error();
1599 }
1600 }
1601
1602 void FileMapInfo::map_or_load_heap_region() {
1603 assert(!object_streaming_mode(), "This should only be done for the mapping approach");
1604 bool success = false;
1605
1606 if (AOTMappedHeapLoader::can_map()) {
1607 success = AOTMappedHeapLoader::map_heap_region(this);
1608 } else if (AOTMappedHeapLoader::can_load()) {
1609 success = AOTMappedHeapLoader::load_heap_region(this);
1610 }
1611
1612 if (!success) {
1613 on_heap_region_loading_error();
1614 }
1615 }
1616
1617 bool FileMapInfo::can_use_heap_region() {
1618 if (!has_heap_region()) {
1619 return false;
1620 }
1621
1622 if (!object_streaming_mode() && !AOTMappedHeapLoader::can_use()) {
1623 // Currently this happens only when using ZGC with an AOT cache generated with -XX:-AOTStreamableObjects
1624 AOTMetaspace::report_loading_error("CDS heap data cannot be used by the selected GC. "
1625 "Please choose a different GC or rebuild AOT cache "
1626 "with -XX:+AOTStreamableObjects");
1627 return false;
1628 }
1629
1630 if (CDSConfig::is_using_aot_linked_classes()) {
1631 assert(!JvmtiExport::should_post_class_file_load_hook(), "already checked");
1632 assert(CDSConfig::is_using_full_module_graph(), "already checked");
1633 } else {
1634 if (JvmtiExport::should_post_class_file_load_hook()) {
1635 AOTMetaspace::report_loading_error("CDS heap data is disabled because JVMTI ClassFileLoadHook is in use.");
1636 return false;
1637 }
1638 if (!CDSConfig::is_using_full_module_graph()) {
1639 if (CDSConfig::is_dumping_final_static_archive()) {
1640 // We are loading the preimage static archive, which has no KlassSubGraphs.
1641 // See CDSConfig::is_dumping_klass_subgraphs()
1642 } else {
1643 AOTMetaspace::report_loading_error("CDS heap data is disabled because archived full module graph is not used.");
1644 return false;
1645 }
1646 }
1647 }
1648
1649 if (JvmtiExport::should_post_class_file_load_hook() && JvmtiExport::has_early_class_hook_env()) {
1650 ShouldNotReachHere(); // CDS should have been disabled.
1651 // The archived objects are mapped at JVM start-up, but we don't know if
1652 // j.l.String or j.l.Class might be replaced by the ClassFileLoadHook,
1653 // which would make the archived String or mirror objects invalid. Let's be safe and not
1654 // use the archived objects. These 2 classes are loaded during the JVMTI "early" stage.
1655 //
1656 // If JvmtiExport::has_early_class_hook_env() is false, the classes of some objects
1657 // in the archived subgraphs may be replaced by the ClassFileLoadHook. But that's OK
1658 // because we won't install an archived object subgraph if the klass of any of the
1659 // referenced objects are replaced. See HeapShared::initialize_from_archived_subgraph().
1660 }
1661
1662 // We pre-compute narrow Klass IDs with the runtime mapping start intended to be the base, and a shift of
1663 // HeapShared::precomputed_narrow_klass_shift. We enforce this encoding at runtime (see
1664 // CompressedKlassPointers::initialize_for_given_encoding()). Therefore, the following assertions must
1665 // hold:
1666 address archive_narrow_klass_base = (address)header()->mapped_base_address();
1667 const int archive_narrow_klass_pointer_bits = header()->narrow_klass_pointer_bits();
1668 const int archive_narrow_klass_shift = header()->narrow_klass_shift();
1669
1670 aot_log_info(aot)("CDS archive was created with max heap size = %zuM, and the following configuration:",
1671 max_heap_size()/M);
1672
1673 aot_log_info(aot)(" narrow_klass_base at mapping start address, narrow_klass_pointer_bits = %d, narrow_klass_shift = %d",
1674 archive_narrow_klass_pointer_bits, archive_narrow_klass_shift);
1675 if (UseCompressedOops) {
1676 aot_log_info(aot)(" narrow_oop_mode = %d, narrow_oop_base = " PTR_FORMAT ", narrow_oop_shift = %d",
1677 narrow_oop_mode(), p2i(narrow_oop_base()), narrow_oop_shift());
1678 aot_log_info(aot)(" AOTCompatibleOopCompression = %s", header()->compatible_oop_compression() ? "true" : "false");
1679 }
1680 aot_log_info(aot)("The current max heap size = %zuM, G1HeapRegion::GrainBytes = %zu",
1681 MaxHeapSize/M, G1HeapRegion::GrainBytes);
1682 aot_log_info(aot)(" narrow_klass_base = " PTR_FORMAT ", arrow_klass_pointer_bits = %d, narrow_klass_shift = %d",
1683 p2i(CompressedKlassPointers::base()), CompressedKlassPointers::narrow_klass_pointer_bits(), CompressedKlassPointers::shift());
1684 if (UseCompressedOops) {
1685 aot_log_info(aot)(" narrow_oop_mode = %d, narrow_oop_base = " PTR_FORMAT ", narrow_oop_shift = %d",
1686 CompressedOops::mode(), p2i(CompressedOops::base()), CompressedOops::shift());
1687 aot_log_info(aot)(" AOTCompatibleOopCompression = %s", AOTCompatibleOopCompression ? "true" : "false");
1688 }
1689 if (!object_streaming_mode()) {
1690 aot_log_info(aot)(" heap range = [" PTR_FORMAT " - " PTR_FORMAT "]",
1691 UseCompressedOops ? p2i(CompressedOops::begin()) :
1692 UseG1GC ? p2i((address)G1CollectedHeap::heap()->reserved().start()) : 0L,
1693 UseCompressedOops ? p2i(CompressedOops::end()) :
1694 UseG1GC ? p2i((address)G1CollectedHeap::heap()->reserved().end()) : 0L);
1695 }
1696
1697 int err = 0;
1698 if ( archive_narrow_klass_base != CompressedKlassPointers::base() ||
1699 (err = 1, archive_narrow_klass_pointer_bits != CompressedKlassPointers::narrow_klass_pointer_bits()) ||
1700 (err = 2, archive_narrow_klass_shift != CompressedKlassPointers::shift()) ) {
1701 stringStream ss;
1702 switch (err) {
1703 case 0:
1704 ss.print("Unexpected encoding base encountered (" PTR_FORMAT ", expected " PTR_FORMAT ")",
1705 p2i(CompressedKlassPointers::base()), p2i(archive_narrow_klass_base));
1706 break;
1707 case 1:
1708 ss.print("Unexpected narrow Klass bit length encountered (%d, expected %d)",
1709 CompressedKlassPointers::narrow_klass_pointer_bits(), archive_narrow_klass_pointer_bits);
1710 break;
1711 case 2:
1712 ss.print("Unexpected narrow Klass shift encountered (%d, expected %d)",
1713 CompressedKlassPointers::shift(), archive_narrow_klass_shift);
1714 break;
1715 default:
1716 ShouldNotReachHere();
1717 };
1718 if (CDSConfig::new_aot_flags_used()) {
1719 LogTarget(Info, aot) lt;
1720 if (lt.is_enabled()) {
1721 LogStream ls(lt);
1722 ls.print_raw(ss.base());
1723 header()->print(&ls);
1724 }
1725 } else {
1726 LogTarget(Info, cds) lt;
1727 if (lt.is_enabled()) {
1728 LogStream ls(lt);
1729 ls.print_raw(ss.base());
1730 header()->print(&ls);
1731 }
1732 }
1733 assert(false, "%s", ss.base());
1734 }
1735
1736 return true;
1737 }
1738
1739 #endif // INCLUDE_CDS_JAVA_HEAP
1740
1741 // Unmap a memory region in the address space.
1742
1743 void FileMapInfo::unmap_regions(int regions[], int num_regions) {
1744 for (int r = 0; r < num_regions; r++) {
1745 int idx = regions[r];
1746 unmap_region(idx);
1747 }
1748 }
1749
1750 void FileMapInfo::unmap_region(int i) {
1751 FileMapRegion* r = region_at(i);
1752 char* mapped_base = r->mapped_base();
1753 size_t size = r->used_aligned();
1754
1755 if (mapped_base != nullptr) {
1756 if (size > 0 && r->mapped_from_file()) {
1757 aot_log_info(aot)("Unmapping region #%d at base " INTPTR_FORMAT " (%s)", i, p2i(mapped_base),
1758 shared_region_name[i]);
1759 if (r->in_reserved_space()) {
1760 // This region was mapped inside a ReservedSpace. Its memory will be freed when the ReservedSpace
1761 // is released. Zero it so that we don't accidentally read its content.
1762 aot_log_info(aot)("Region #%d (%s) is in a reserved space, it will be freed when the space is released", i, shared_region_name[i]);
1763 } else {
1764 os::unmap_memory(mapped_base, size);
1765 }
1766 }
1767 r->set_mapped_base(nullptr);
1768 }
1769 }
1770
1771 void FileMapInfo::assert_mark(bool check) {
1772 if (!check) {
1773 AOTMetaspace::unrecoverable_loading_error("Mark mismatch while restoring from shared file.");
1774 }
1775 }
1776
1777 FileMapInfo* FileMapInfo::_current_info = nullptr;
1778 FileMapInfo* FileMapInfo::_dynamic_archive_info = nullptr;
1779 bool FileMapInfo::_memory_mapping_failed = false;
1780
1781 // Open the shared archive file, read and validate the header
1782 // information (version, boot classpath, etc.). If initialization
1783 // fails, shared spaces are disabled and the file is closed.
1784 //
1785 // Validation of the archive is done in two steps:
1786 //
1787 // [1] validate_header() - done here.
1788 // [2] validate_shared_path_table - this is done later, because the table is in the RO
1789 // region of the archive, which is not mapped yet.
1790 bool FileMapInfo::open_as_input() {
1791 assert(CDSConfig::is_using_archive(), "UseSharedSpaces expected.");
1792 assert(Arguments::has_jimage(), "The shared archive file cannot be used with an exploded module build.");
1793
1794 if (JvmtiExport::should_post_class_file_load_hook() && JvmtiExport::has_early_class_hook_env()) {
1795 // CDS assumes that no classes resolved in vmClasses::resolve_all()
1796 // are replaced at runtime by JVMTI ClassFileLoadHook. All of those classes are resolved
1797 // during the JVMTI "early" stage, so we can still use CDS if
1798 // JvmtiExport::has_early_class_hook_env() is false.
1799 AOTMetaspace::report_loading_error("CDS is disabled because early JVMTI ClassFileLoadHook is in use.");
1800 return false;
1801 }
1802
1803 if (!open_for_read() || !init_from_file(_fd) || !validate_header()) {
1804 if (_is_static) {
1805 AOTMetaspace::report_loading_error("Loading static archive failed.");
1806 return false;
1807 } else {
1808 AOTMetaspace::report_loading_error("Loading dynamic archive failed.");
1809 if (AutoCreateSharedArchive) {
1810 CDSConfig::enable_dumping_dynamic_archive(_full_path);
1811 }
1812 return false;
1813 }
1814 }
1815
1816 return true;
1817 }
1818
1819 bool FileMapInfo::validate_aot_class_linking() {
1820 // These checks need to be done after FileMapInfo::initialize(), which gets called before Universe::heap()
1821 // is available.
1822 if (header()->has_aot_linked_classes()) {
1823 const char* archive_type = CDSConfig::type_of_archive_being_loaded();
1824 CDSConfig::set_has_aot_linked_classes(true);
1825 if (JvmtiExport::should_post_class_file_load_hook()) {
1826 aot_log_error(aot)("%s has aot-linked classes. It cannot be used when JVMTI ClassFileLoadHook is in use.",
1827 archive_type);
1828 return false;
1829 }
1830 if (JvmtiExport::has_early_vmstart_env()) {
1831 aot_log_error(aot)("%s has aot-linked classes. It cannot be used when JVMTI early vm start is in use.",
1832 archive_type);
1833 return false;
1834 }
1835 if (!CDSConfig::is_using_full_module_graph()) {
1836 aot_log_error(aot)("%s has aot-linked classes. It cannot be used when archived full module graph is not used.",
1837 archive_type);
1838 return false;
1839 }
1840
1841 const char* prop = Arguments::get_property("java.security.manager");
1842 if (prop != nullptr && strcmp(prop, "disallow") != 0) {
1843 aot_log_error(aot)("%s has aot-linked classes. It cannot be used with -Djava.security.manager=%s.",
1844 archive_type, prop);
1845 return false;
1846 }
1847
1848 #if INCLUDE_JVMTI
1849 if (Arguments::has_jdwp_agent()) {
1850 aot_log_error(aot)("%s has aot-linked classes. It cannot be used with JDWP agent", archive_type);
1851 return false;
1852 }
1853 #endif
1854 }
1855
1856 return true;
1857 }
1858
1859 // The 2 core spaces are RW->RO
1860 FileMapRegion* FileMapInfo::first_core_region() const {
1861 return region_at(AOTMetaspace::rw);
1862 }
1863
1864 FileMapRegion* FileMapInfo::last_core_region() const {
1865 return region_at(AOTMetaspace::ro);
1866 }
1867
1868 void FileMapInfo::print(outputStream* st) const {
1869 header()->print(st);
1870 if (!is_static()) {
1871 dynamic_header()->print(st);
1872 }
1873 }
1874
1875 int FileMapHeader::compute_crc() {
1876 char* start = (char*)this;
1877 // start computing from the field after _header_size to end of base archive name.
1878 char* buf = (char*)&(_generic_header._header_size) + sizeof(_generic_header._header_size);
1879 size_t sz = header_size() - (buf - start);
1880 int crc = ClassLoader::crc32(0, buf, (jint)sz);
1881 return crc;
1882 }
1883
1884 // This function should only be called during run time with UseSharedSpaces enabled.
1885 bool FileMapHeader::validate() {
1886 const char* file_type = CDSConfig::type_of_archive_being_loaded();
1887 if (_obj_alignment != ObjectAlignmentInBytes) {
1888 AOTMetaspace::report_loading_error("The %s's ObjectAlignmentInBytes of %d"
1889 " does not equal the current ObjectAlignmentInBytes of %d.",
1890 file_type, _obj_alignment, ObjectAlignmentInBytes);
1891 return false;
1892 }
1893 if (_compact_strings != CompactStrings) {
1894 AOTMetaspace::report_loading_error("The %s's CompactStrings setting (%s)"
1895 " does not equal the current CompactStrings setting (%s).", file_type,
1896 _compact_strings ? "enabled" : "disabled",
1897 CompactStrings ? "enabled" : "disabled");
1898 return false;
1899 }
1900 if (TrainingData::have_data()) {
1901 if (_type_profile_level != TypeProfileLevel) {
1902 AOTMetaspace::report_loading_error("The %s's TypeProfileLevel setting (%d)"
1903 " does not equal the current TypeProfileLevel setting (%d).", file_type,
1904 _type_profile_level, TypeProfileLevel);
1905 return false;
1906 }
1907 if (_type_profile_args_limit != TypeProfileArgsLimit) {
1908 AOTMetaspace::report_loading_error("The %s's TypeProfileArgsLimit setting (%d)"
1909 " does not equal the current TypeProfileArgsLimit setting (%d).", file_type,
1910 _type_profile_args_limit, TypeProfileArgsLimit);
1911 return false;
1912 }
1913 if (_type_profile_parms_limit != TypeProfileParmsLimit) {
1914 AOTMetaspace::report_loading_error("The %s's TypeProfileParamsLimit setting (%d)"
1915 " does not equal the current TypeProfileParamsLimit setting (%d).", file_type,
1916 _type_profile_args_limit, TypeProfileArgsLimit);
1917 return false;
1918
1919 }
1920 if (_type_profile_width != TypeProfileWidth) {
1921 AOTMetaspace::report_loading_error("The %s's TypeProfileWidth setting (%d)"
1922 " does not equal the current TypeProfileWidth setting (%d).", file_type,
1923 (int)_type_profile_width, (int)TypeProfileWidth);
1924 return false;
1925
1926 }
1927 if (_bci_profile_width != BciProfileWidth) {
1928 AOTMetaspace::report_loading_error("The %s's BciProfileWidth setting (%d)"
1929 " does not equal the current BciProfileWidth setting (%d).", file_type,
1930 (int)_bci_profile_width, (int)BciProfileWidth);
1931 return false;
1932 }
1933 if (_type_profile_casts != TypeProfileCasts) {
1934 AOTMetaspace::report_loading_error("The %s's TypeProfileCasts setting (%s)"
1935 " does not equal the current TypeProfileCasts setting (%s).", file_type,
1936 _type_profile_casts ? "enabled" : "disabled",
1937 TypeProfileCasts ? "enabled" : "disabled");
1938
1939 return false;
1940
1941 }
1942 if (_profile_traps != ProfileTraps) {
1943 AOTMetaspace::report_loading_error("The %s's ProfileTraps setting (%s)"
1944 " does not equal the current ProfileTraps setting (%s).", file_type,
1945 _profile_traps ? "enabled" : "disabled",
1946 ProfileTraps ? "enabled" : "disabled");
1947
1948 return false;
1949 }
1950 if (_spec_trap_limit_extra_entries != SpecTrapLimitExtraEntries) {
1951 AOTMetaspace::report_loading_error("The %s's SpecTrapLimitExtraEntries setting (%d)"
1952 " does not equal the current SpecTrapLimitExtraEntries setting (%d).", file_type,
1953 _spec_trap_limit_extra_entries, SpecTrapLimitExtraEntries);
1954 return false;
1955
1956 }
1957 }
1958
1959 // This must be done after header validation because it might change the
1960 // header data
1961 const char* prop = Arguments::get_property("java.system.class.loader");
1962 if (prop != nullptr) {
1963 if (has_aot_linked_classes()) {
1964 AOTMetaspace::report_loading_error("%s has aot-linked classes. It cannot be used when the "
1965 "java.system.class.loader property is specified.",
1966 CDSConfig::type_of_archive_being_loaded());
1967 return false;
1968 }
1969 aot_log_warning(aot)("Archived non-system classes are disabled because the "
1970 "java.system.class.loader property is specified (value = \"%s\"). "
1971 "To use archived non-system classes, this property must not be set", prop);
1972 _has_platform_or_app_classes = false;
1973 }
1974
1975
1976 if (!_verify_local && BytecodeVerificationLocal) {
1977 // we cannot load boot classes, so there's no point of using the CDS archive
1978 AOTMetaspace::report_loading_error("The %s's BytecodeVerificationLocal setting (%s)"
1979 " does not equal the current BytecodeVerificationLocal setting (%s).", file_type,
1980 _verify_local ? "enabled" : "disabled",
1981 BytecodeVerificationLocal ? "enabled" : "disabled");
1982 return false;
1983 }
1984
1985 // For backwards compatibility, we don't check the BytecodeVerificationRemote setting
1986 // if the archive only contains system classes.
1987 if (_has_platform_or_app_classes
1988 && !_verify_remote // we didn't verify the archived platform/app classes
1989 && BytecodeVerificationRemote) { // but we want to verify all loaded platform/app classes
1990 aot_log_info(aot)("The %s was created with less restrictive "
1991 "verification setting than the current setting.", file_type);
1992 // Pretend that we didn't have any archived platform/app classes, so they won't be loaded
1993 // by SystemDictionaryShared.
1994 _has_platform_or_app_classes = false;
1995 }
1996
1997 aot_log_info(aot)("The %s was created with UseCompressedOops = %d, UseCompactObjectHeaders = %d",
1998 file_type, compressed_oops(), compact_headers());
1999 if (compressed_oops() != UseCompressedOops) {
2000 aot_log_warning(aot)("Unable to use %s.\nThe saved state of UseCompressedOops (%d) is "
2001 "different from runtime (%d), CDS will be disabled.", file_type,
2002 compressed_oops(), UseCompressedOops);
2003 return false;
2004 }
2005
2006 if (is_static()) {
2007 const char* err = nullptr;
2008 if (Arguments::is_valhalla_enabled()) {
2009 if (!_has_valhalla_patched_classes) {
2010 err = "not created";
2011 }
2012 } else {
2013 if (_has_valhalla_patched_classes) {
2014 err = "created";
2015 }
2016 }
2017 if (err != nullptr) {
2018 log_warning(cds)("This archive was %s with --enable-preview. It is "
2019 "incompatible with the current JVM setting", err);
2020 return false;
2021 }
2022 }
2023
2024 if (compact_headers() != UseCompactObjectHeaders) {
2025 aot_log_warning(aot)("Unable to use %s.\nThe %s's UseCompactObjectHeaders setting (%s)"
2026 " does not equal the current UseCompactObjectHeaders setting (%s).", file_type, file_type,
2027 _compact_headers ? "enabled" : "disabled",
2028 UseCompactObjectHeaders ? "enabled" : "disabled");
2029 return false;
2030 }
2031
2032 if (!_use_optimized_module_handling && !CDSConfig::is_dumping_final_static_archive()) {
2033 CDSConfig::stop_using_optimized_module_handling();
2034 aot_log_info(aot)("optimized module handling: disabled because archive was created without optimized module handling");
2035 }
2036
2037 if (is_static()) {
2038 // Only the static archive can contain the full module graph.
2039 if (!_has_full_module_graph) {
2040 CDSConfig::stop_using_full_module_graph("archive was created without full module graph");
2041 }
2042 }
2043
2044 return true;
2045 }
2046
2047 bool FileMapInfo::validate_header() {
2048 if (!header()->validate()) {
2049 return false;
2050 }
2051 if (_is_static) {
2052 return true;
2053 } else {
2054 return DynamicArchive::validate(this);
2055 }
2056 }
2057
2058 #if INCLUDE_JVMTI
2059 ClassPathEntry** FileMapInfo::_classpath_entries_for_jvmti = nullptr;
2060
2061 ClassPathEntry* FileMapInfo::get_classpath_entry_for_jvmti(int i, TRAPS) {
2062 if (i == 0) {
2063 // index 0 corresponds to the ClassPathImageEntry which is a globally shared object
2064 // and should never be deleted.
2065 return ClassLoader::get_jrt_entry();
2066 }
2067 ClassPathEntry* ent = _classpath_entries_for_jvmti[i];
2068 if (ent == nullptr) {
2069 const AOTClassLocation* cl = AOTClassLocationConfig::runtime()->class_location_at(i);
2070 const char* path = cl->path();
2071 struct stat st;
2072 if (os::stat(path, &st) != 0) {
2073 char *msg = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(path) + 128);
2074 jio_snprintf(msg, strlen(path) + 127, "error in finding JAR file %s", path);
2075 THROW_MSG_(vmSymbols::java_io_IOException(), msg, nullptr);
2076 } else {
2077 ent = ClassLoader::create_class_path_entry(THREAD, path, &st);
2078 if (ent == nullptr) {
2079 char *msg = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(path) + 128);
2080 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
2081 THROW_MSG_(vmSymbols::java_io_IOException(), msg, nullptr);
2082 }
2083 }
2084
2085 MutexLocker mu(THREAD, CDSClassFileStream_lock);
2086 if (_classpath_entries_for_jvmti[i] == nullptr) {
2087 _classpath_entries_for_jvmti[i] = ent;
2088 } else {
2089 // Another thread has beat me to creating this entry
2090 delete ent;
2091 ent = _classpath_entries_for_jvmti[i];
2092 }
2093 }
2094
2095 return ent;
2096 }
2097
2098 ClassFileStream* FileMapInfo::open_stream_for_jvmti(InstanceKlass* ik, Handle class_loader, TRAPS) {
2099 int path_index = ik->shared_classpath_index();
2100 assert(path_index >= 0, "should be called for shared built-in classes only");
2101 assert(path_index < AOTClassLocationConfig::runtime()->length(), "sanity");
2102
2103 ClassPathEntry* cpe = get_classpath_entry_for_jvmti(path_index, CHECK_NULL);
2104 assert(cpe != nullptr, "must be");
2105
2106 Symbol* name = ik->name();
2107 const char* const class_name = name->as_C_string();
2108 const char* const file_name = ClassLoader::file_name_for_class_name(class_name,
2109 name->utf8_length());
2110 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader());
2111 const AOTClassLocation* cl = AOTClassLocationConfig::runtime()->class_location_at(path_index);
2112 ClassFileStream* cfs;
2113 if (class_loader() != nullptr && cl->is_multi_release_jar()) {
2114 // This class was loaded from a multi-release JAR file during dump time. The
2115 // process for finding its classfile is complex. Let's defer to the Java code
2116 // in java.lang.ClassLoader.
2117 cfs = get_stream_from_class_loader(class_loader, cpe, file_name, CHECK_NULL);
2118 } else {
2119 cfs = cpe->open_stream_for_loader(THREAD, file_name, loader_data);
2120 }
2121 assert(cfs != nullptr, "must be able to read the classfile data of shared classes for built-in loaders.");
2122 log_debug(aot, jvmti)("classfile data for %s [%d: %s] = %d bytes", class_name, path_index,
2123 cfs->source(), cfs->length());
2124 return cfs;
2125 }
2126
2127 ClassFileStream* FileMapInfo::get_stream_from_class_loader(Handle class_loader,
2128 ClassPathEntry* cpe,
2129 const char* file_name,
2130 TRAPS) {
2131 JavaValue result(T_OBJECT);
2132 oop class_name = java_lang_String::create_oop_from_str(file_name, THREAD);
2133 Handle h_class_name = Handle(THREAD, class_name);
2134
2135 // byte[] ClassLoader.getResourceAsByteArray(String name)
2136 JavaCalls::call_virtual(&result,
2137 class_loader,
2138 vmClasses::ClassLoader_klass(),
2139 vmSymbols::getResourceAsByteArray_name(),
2140 vmSymbols::getResourceAsByteArray_signature(),
2141 h_class_name,
2142 CHECK_NULL);
2143 assert(result.get_type() == T_OBJECT, "just checking");
2144 oop obj = result.get_oop();
2145 assert(obj != nullptr, "ClassLoader.getResourceAsByteArray should not return null");
2146
2147 // copy from byte[] to a buffer
2148 typeArrayOop ba = typeArrayOop(obj);
2149 jint len = ba->length();
2150 u1* buffer = NEW_RESOURCE_ARRAY(u1, len);
2151 ArrayAccess<>::arraycopy_to_native<>(ba, typeArrayOopDesc::element_offset<jbyte>(0), buffer, len);
2152
2153 return new ClassFileStream(buffer, len, cpe->name());
2154 }
2155 #endif