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/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 inline void CDSMustMatchFlags::do_print(outputStream* st, intx v) {
95 st->print("%zd", v);
96 }
97
98 inline void CDSMustMatchFlags::do_print(outputStream* st, uintx v) {
99 st->print("%zu", v);
100 }
101
102 inline void CDSMustMatchFlags::do_print(outputStream* st, double v) {
103 st->print("%f", v);
104 }
105
106 void CDSMustMatchFlags::init() {
107 assert(CDSConfig::is_dumping_archive(), "sanity");
108 _max_name_width = 0;
109
110 #define INIT_CDS_MUST_MATCH_FLAG(n) \
111 _v_##n = n; \
112 _max_name_width = MAX2(_max_name_width,strlen(#n));
113 CDS_MUST_MATCH_FLAGS_DO(INIT_CDS_MUST_MATCH_FLAG);
114 #undef INIT_CDS_MUST_MATCH_FLAG
115 }
116
117 bool CDSMustMatchFlags::runtime_check() const {
118 #define CHECK_CDS_MUST_MATCH_FLAG(n) \
119 if (_v_##n != n) { \
120 ResourceMark rm; \
121 stringStream ss; \
122 ss.print("VM option %s is different between dumptime (", #n); \
123 do_print(&ss, _v_ ## n); \
124 ss.print(") and runtime ("); \
125 do_print(&ss, n); \
126 ss.print(")"); \
127 log_info(cds)("%s", ss.as_string()); \
128 return false; \
129 }
130 CDS_MUST_MATCH_FLAGS_DO(CHECK_CDS_MUST_MATCH_FLAG);
131 #undef CHECK_CDS_MUST_MATCH_FLAG
132
133 return true;
134 }
135
136 void CDSMustMatchFlags::print_info() const {
137 LogTarget(Info, cds) lt;
138 if (lt.is_enabled()) {
139 LogStream ls(lt);
140 ls.print_cr("Recorded VM flags during dumptime:");
141 print(&ls);
142 }
143 }
144
145 void CDSMustMatchFlags::print(outputStream* st) const {
146 #define PRINT_CDS_MUST_MATCH_FLAG(n) \
147 st->print("- %-s ", #n); \
148 st->sp(int(_max_name_width - strlen(#n))); \
149 do_print(st, _v_##n); \
150 st->cr();
151 CDS_MUST_MATCH_FLAGS_DO(PRINT_CDS_MUST_MATCH_FLAG);
152 #undef PRINT_CDS_MUST_MATCH_FLAG
153 }
154
155 // Fill in the fileMapInfo structure with data about this VM instance.
156
157 // This method copies the vm version info into header_version. If the version is too
158 // long then a truncated version, which has a hash code appended to it, is copied.
159 //
160 // Using a template enables this method to verify that header_version is an array of
161 // length JVM_IDENT_MAX. This ensures that the code that writes to the CDS file and
162 // the code that reads the CDS file will both use the same size buffer. Hence, will
163 // use identical truncation. This is necessary for matching of truncated versions.
164 template <int N> static void get_header_version(char (&header_version) [N]) {
165 assert(N == JVM_IDENT_MAX, "Bad header_version size");
166
167 const char *vm_version = VM_Version::internal_vm_info_string();
168 const int version_len = (int)strlen(vm_version);
169
170 memset(header_version, 0, JVM_IDENT_MAX);
171
172 if (version_len < (JVM_IDENT_MAX-1)) {
173 strcpy(header_version, vm_version);
174
175 } else {
176 // Get the hash value. Use a static seed because the hash needs to return the same
177 // value over multiple jvm invocations.
178 uint32_t hash = AltHashing::halfsiphash_32(8191, (const uint8_t*)vm_version, version_len);
179
180 // Truncate the ident, saving room for the 8 hex character hash value.
181 strncpy(header_version, vm_version, JVM_IDENT_MAX-9);
182
183 // Append the hash code as eight hex digits.
184 os::snprintf_checked(&header_version[JVM_IDENT_MAX-9], 9, "%08x", hash);
185 }
186
187 assert(header_version[JVM_IDENT_MAX-1] == 0, "must be");
188 }
189
190 FileMapInfo::FileMapInfo(const char* full_path, bool is_static) :
191 _is_static(is_static), _file_open(false), _is_mapped(false), _fd(-1), _file_offset(0),
192 _full_path(full_path), _base_archive_name(nullptr), _header(nullptr) {
193 if (_is_static) {
194 assert(_current_info == nullptr, "must be singleton"); // not thread safe
195 _current_info = this;
196 } else {
197 assert(_dynamic_archive_info == nullptr, "must be singleton"); // not thread safe
198 _dynamic_archive_info = this;
199 }
200 }
201
202 FileMapInfo::~FileMapInfo() {
203 if (_is_static) {
204 assert(_current_info == this, "must be singleton"); // not thread safe
205 _current_info = nullptr;
206 } else {
207 assert(_dynamic_archive_info == this, "must be singleton"); // not thread safe
208 _dynamic_archive_info = nullptr;
209 }
210
211 if (_header != nullptr) {
212 os::free(_header);
213 }
214
215 if (_file_open) {
216 ::close(_fd);
217 }
218 }
219
220 void FileMapInfo::free_current_info() {
221 assert(CDSConfig::is_dumping_final_static_archive(), "only supported in this mode");
222 assert(_current_info != nullptr, "sanity");
223 delete _current_info;
224 assert(_current_info == nullptr, "sanity"); // Side effect expected from the above "delete" operator.
225 }
226
227 void FileMapInfo::populate_header(size_t core_region_alignment) {
228 assert(_header == nullptr, "Sanity check");
229 size_t c_header_size;
230 size_t header_size;
231 size_t base_archive_name_size = 0;
232 size_t base_archive_name_offset = 0;
233 if (is_static()) {
234 c_header_size = sizeof(FileMapHeader);
235 header_size = c_header_size;
236 } else {
237 // dynamic header including base archive name for non-default base archive
238 c_header_size = sizeof(DynamicArchiveHeader);
239 header_size = c_header_size;
240
241 const char* default_base_archive_name = CDSConfig::default_archive_path();
242 const char* current_base_archive_name = CDSConfig::input_static_archive_path();
243 if (!os::same_files(current_base_archive_name, default_base_archive_name)) {
244 base_archive_name_size = strlen(current_base_archive_name) + 1;
245 header_size += base_archive_name_size;
246 base_archive_name_offset = c_header_size;
247 }
248 }
249 _header = (FileMapHeader*)os::malloc(header_size, mtInternal);
250 memset((void*)_header, 0, header_size);
251 _header->populate(this,
252 core_region_alignment,
253 header_size,
254 base_archive_name_size,
255 base_archive_name_offset);
256 }
257
258 void FileMapHeader::populate(FileMapInfo *info, size_t core_region_alignment,
259 size_t header_size, size_t base_archive_name_size,
260 size_t base_archive_name_offset) {
261 // 1. We require _generic_header._magic to be at the beginning of the file
262 // 2. FileMapHeader also assumes that _generic_header is at the beginning of the file
263 assert(offset_of(FileMapHeader, _generic_header) == 0, "must be");
264 set_header_size((unsigned int)header_size);
265 set_base_archive_name_offset((unsigned int)base_archive_name_offset);
266 set_base_archive_name_size((unsigned int)base_archive_name_size);
267 if (CDSConfig::is_dumping_dynamic_archive()) {
268 set_magic(CDS_DYNAMIC_ARCHIVE_MAGIC);
269 } else if (CDSConfig::is_dumping_preimage_static_archive()) {
270 set_magic(CDS_PREIMAGE_ARCHIVE_MAGIC);
271 } else {
272 set_magic(CDS_ARCHIVE_MAGIC);
273 }
274 set_version(CURRENT_CDS_ARCHIVE_VERSION);
275
276 if (!info->is_static() && base_archive_name_size != 0) {
277 // copy base archive name
278 copy_base_archive_name(CDSConfig::input_static_archive_path());
279 }
280 _core_region_alignment = core_region_alignment;
281 _obj_alignment = ObjectAlignmentInBytes;
282 _compact_strings = CompactStrings;
283 _compact_headers = UseCompactObjectHeaders;
284 #if INCLUDE_CDS_JAVA_HEAP
285 if (CDSConfig::is_dumping_heap()) {
286 _object_streaming_mode = HeapShared::is_writing_streaming_mode();
287 _narrow_oop_mode = AOTMappedHeapWriter::narrow_oop_mode();
288 _narrow_oop_base = AOTMappedHeapWriter::narrow_oop_base();
289 _narrow_oop_shift = AOTMappedHeapWriter::narrow_oop_shift();
290 }
291 #endif
292 _compressed_oops = UseCompressedOops;
293 _compressed_class_ptrs = UseCompressedClassPointers;
294 if (UseCompressedClassPointers) {
295 #ifdef _LP64
296 _narrow_klass_pointer_bits = CompressedKlassPointers::narrow_klass_pointer_bits();
297 _narrow_klass_shift = ArchiveBuilder::precomputed_narrow_klass_shift();
298 #endif
299 } else {
300 _narrow_klass_pointer_bits = _narrow_klass_shift = -1;
301 }
302 // Which JIT compier is used
303 _compiler_type = (u1)CompilerConfig::compiler_type();
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("- compressed_class_ptrs: %d", _compressed_class_ptrs);
366 st->print_cr("- narrow_klass_pointer_bits: %d", _narrow_klass_pointer_bits);
367 st->print_cr("- narrow_klass_shift: %d", _narrow_klass_shift);
368 st->print_cr("- cloned_vtables_offset: 0x%zx", _cloned_vtables_offset);
369 st->print_cr("- early_serialized_data_offset: 0x%zx", _early_serialized_data_offset);
370 st->print_cr("- serialized_data_offset: 0x%zx", _serialized_data_offset);
371 st->print_cr("- jvm_ident: %s", _jvm_ident);
372 st->print_cr("- class_location_config_offset: 0x%zx", _class_location_config_offset);
373 st->print_cr("- verify_local: %d", _verify_local);
374 st->print_cr("- verify_remote: %d", _verify_remote);
375 st->print_cr("- has_platform_or_app_classes: %d", _has_platform_or_app_classes);
376 st->print_cr("- requested_base_address: " INTPTR_FORMAT, p2i(_requested_base_address));
377 st->print_cr("- mapped_base_address: " INTPTR_FORMAT, p2i(_mapped_base_address));
378
379 st->print_cr("- object_streaming_mode: %d", _object_streaming_mode);
380 st->print_cr("- mapped_heap_header");
381 st->print_cr(" - root_segments");
382 st->print_cr(" - roots_count: %d", _mapped_heap_header.root_segments().roots_count());
383 st->print_cr(" - base_offset: 0x%zx", _mapped_heap_header.root_segments().base_offset());
384 st->print_cr(" - count: %zu", _mapped_heap_header.root_segments().count());
385 st->print_cr(" - max_size_elems: %d", _mapped_heap_header.root_segments().max_size_in_elems());
386 st->print_cr(" - max_size_bytes: %zu", _mapped_heap_header.root_segments().max_size_in_bytes());
387 st->print_cr(" - oopmap_start_pos: %zu", _mapped_heap_header.oopmap_start_pos());
388 st->print_cr(" - oopmap_ptrmap_pos: %zu", _mapped_heap_header.ptrmap_start_pos());
389 st->print_cr("- streamed_heap_header");
390 st->print_cr(" - forwarding_offset: %zu", _streamed_heap_header.forwarding_offset());
391 st->print_cr(" - roots_offset: %zu", _streamed_heap_header.roots_offset());
392 st->print_cr(" - num_roots: %zu", _streamed_heap_header.num_roots());
393 st->print_cr(" - root_highest_object_index_table_offset: %zu", _streamed_heap_header.root_highest_object_index_table_offset());
394 st->print_cr(" - num_archived_objects: %zu", _streamed_heap_header.num_archived_objects());
395
396 st->print_cr("- _rw_ptrmap_start_pos: %zu", _rw_ptrmap_start_pos);
397 st->print_cr("- _ro_ptrmap_start_pos: %zu", _ro_ptrmap_start_pos);
398 st->print_cr("- use_optimized_module_handling: %d", _use_optimized_module_handling);
399 st->print_cr("- has_full_module_graph %d", _has_full_module_graph);
400 st->print_cr("- has_valhalla_patched_classes %d", _has_valhalla_patched_classes);
401 _must_match.print(st);
402 st->print_cr("- has_aot_linked_classes %d", _has_aot_linked_classes);
403 }
404
405 bool FileMapInfo::validate_class_location() {
406 assert(CDSConfig::is_using_archive(), "runtime only");
407
408 AOTClassLocationConfig* config = header()->class_location_config();
409 bool has_extra_module_paths = false;
410 if (!config->validate(full_path(), header()->has_aot_linked_classes(), &has_extra_module_paths)) {
411 if (PrintSharedArchiveAndExit) {
412 AOTMetaspace::set_archive_loading_failed();
413 return true;
414 } else {
415 return false;
416 }
417 }
418
419 if (header()->has_full_module_graph() && has_extra_module_paths) {
420 CDSConfig::stop_using_optimized_module_handling();
421 AOTMetaspace::report_loading_error("optimized module handling: disabled because extra module path(s) are specified");
422 }
423
424 if (CDSConfig::is_dumping_dynamic_archive()) {
425 // Only support dynamic dumping with the usage of the default CDS archive
426 // or a simple base archive.
427 // If the base layer archive contains additional path component besides
428 // the runtime image and the -cp, dynamic dumping is disabled.
429 if (config->num_boot_classpaths() > 0) {
430 CDSConfig::disable_dumping_dynamic_archive();
431 aot_log_warning(aot)(
432 "Dynamic archiving is disabled because base layer archive has appended boot classpath");
433 }
434 if (config->num_module_paths() > 0) {
435 if (has_extra_module_paths) {
436 CDSConfig::disable_dumping_dynamic_archive();
437 aot_log_warning(aot)(
438 "Dynamic archiving is disabled because base layer archive has a different module path");
439 }
440 }
441 }
442
443 #if INCLUDE_JVMTI
444 if (_classpath_entries_for_jvmti != nullptr) {
445 os::free(_classpath_entries_for_jvmti);
446 }
447 size_t sz = sizeof(ClassPathEntry*) * AOTClassLocationConfig::runtime()->length();
448 _classpath_entries_for_jvmti = (ClassPathEntry**)os::malloc(sz, mtClass);
449 memset((void*)_classpath_entries_for_jvmti, 0, sz);
450 #endif
451
452 return true;
453 }
454
455 // A utility class for reading/validating the GenericCDSFileMapHeader portion of
456 // a CDS archive's header. The file header of all CDS archives with versions from
457 // CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION (12) are guaranteed to always start
458 // with GenericCDSFileMapHeader. This makes it possible to read important information
459 // from a CDS archive created by a different version of HotSpot, so that we can
460 // automatically regenerate the archive as necessary (JDK-8261455).
461 class FileHeaderHelper {
462 int _fd;
463 bool _is_valid;
464 bool _is_static;
465 GenericCDSFileMapHeader* _header;
466 const char* _archive_name;
467 const char* _base_archive_name;
468
469 public:
470 FileHeaderHelper(const char* archive_name, bool is_static) {
471 _fd = -1;
472 _is_valid = false;
473 _header = nullptr;
474 _base_archive_name = nullptr;
475 _archive_name = archive_name;
476 _is_static = is_static;
477 }
478
479 ~FileHeaderHelper() {
480 if (_header != nullptr) {
481 FREE_C_HEAP_ARRAY(char, _header);
482 }
483 if (_fd != -1) {
484 ::close(_fd);
485 }
486 }
487
488 bool initialize() {
489 assert(_archive_name != nullptr, "Archive name is null");
490 _fd = os::open(_archive_name, O_RDONLY | O_BINARY, 0);
491 if (_fd < 0) {
492 AOTMetaspace::report_loading_error("Specified %s not found (%s)", CDSConfig::type_of_archive_being_loaded(), _archive_name);
493 return false;
494 }
495 return initialize(_fd);
496 }
497
498 // for an already opened file, do not set _fd
499 bool initialize(int fd) {
500 assert(_archive_name != nullptr, "Archive name is null");
501 assert(fd != -1, "Archive must be opened already");
502 // First read the generic header so we know the exact size of the actual header.
503 const char* file_type = CDSConfig::type_of_archive_being_loaded();
504 GenericCDSFileMapHeader gen_header;
505 size_t size = sizeof(GenericCDSFileMapHeader);
506 os::lseek(fd, 0, SEEK_SET);
507 size_t n = ::read(fd, (void*)&gen_header, (unsigned int)size);
508 if (n != size) {
509 aot_log_warning(aot)("Unable to read generic CDS file map header from %s", file_type);
510 return false;
511 }
512
513 if (gen_header._magic != CDS_ARCHIVE_MAGIC &&
514 gen_header._magic != CDS_DYNAMIC_ARCHIVE_MAGIC &&
515 gen_header._magic != CDS_PREIMAGE_ARCHIVE_MAGIC) {
516 aot_log_warning(aot)("The %s has a bad magic number: %#x", file_type, gen_header._magic);
517 return false;
518 }
519
520 if (gen_header._version < CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION) {
521 aot_log_warning(aot)("Cannot handle %s version 0x%x. Must be at least 0x%x.",
522 file_type, gen_header._version, CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION);
523 return false;
524 }
525
526 if (gen_header._version != CURRENT_CDS_ARCHIVE_VERSION) {
527 aot_log_warning(aot)("The %s version 0x%x does not match the required version 0x%x.",
528 file_type, gen_header._version, CURRENT_CDS_ARCHIVE_VERSION);
529 }
530
531 size_t filelen = os::lseek(fd, 0, SEEK_END);
532 if (gen_header._header_size >= filelen) {
533 aot_log_warning(aot)("Archive file header larger than archive file");
534 return false;
535 }
536
537 // Read the actual header and perform more checks
538 size = gen_header._header_size;
539 _header = (GenericCDSFileMapHeader*)NEW_C_HEAP_ARRAY(char, size, mtInternal);
540 os::lseek(fd, 0, SEEK_SET);
541 n = ::read(fd, (void*)_header, (unsigned int)size);
542 if (n != size) {
543 aot_log_warning(aot)("Unable to read file map header from %s", file_type);
544 return false;
545 }
546
547 if (!check_header_crc()) {
548 return false;
549 }
550
551 if (!check_and_init_base_archive_name()) {
552 return false;
553 }
554
555 // All fields in the GenericCDSFileMapHeader has been validated.
556 _is_valid = true;
557 return true;
558 }
559
560 GenericCDSFileMapHeader* get_generic_file_header() {
561 assert(_header != nullptr && _is_valid, "must be a valid archive file");
562 return _header;
563 }
564
565 const char* base_archive_name() {
566 assert(_header != nullptr && _is_valid, "must be a valid archive file");
567 return _base_archive_name;
568 }
569
570 bool is_static_archive() const {
571 return _header->_magic == CDS_ARCHIVE_MAGIC;
572 }
573
574 bool is_dynamic_archive() const {
575 return _header->_magic == CDS_DYNAMIC_ARCHIVE_MAGIC;
576 }
577
578 bool is_preimage_static_archive() const {
579 return _header->_magic == CDS_PREIMAGE_ARCHIVE_MAGIC;
580 }
581
582 private:
583 bool check_header_crc() const {
584 if (VerifySharedSpaces) {
585 FileMapHeader* header = (FileMapHeader*)_header;
586 int actual_crc = header->compute_crc();
587 if (actual_crc != header->crc()) {
588 aot_log_info(aot)("_crc expected: %d", header->crc());
589 aot_log_info(aot)(" actual: %d", actual_crc);
590 aot_log_warning(aot)("Header checksum verification failed.");
591 return false;
592 }
593 }
594 return true;
595 }
596
597 bool check_and_init_base_archive_name() {
598 unsigned int name_offset = _header->_base_archive_name_offset;
599 unsigned int name_size = _header->_base_archive_name_size;
600 unsigned int header_size = _header->_header_size;
601
602 if (name_offset + name_size < name_offset) {
603 aot_log_warning(aot)("base_archive_name offset/size overflow: " UINT32_FORMAT "/" UINT32_FORMAT,
604 name_offset, name_size);
605 return false;
606 }
607
608 if (is_static_archive() || is_preimage_static_archive()) {
609 if (name_offset != 0) {
610 aot_log_warning(aot)("static shared archive must have zero _base_archive_name_offset");
611 return false;
612 }
613 if (name_size != 0) {
614 aot_log_warning(aot)("static shared archive must have zero _base_archive_name_size");
615 return false;
616 }
617 } else {
618 assert(is_dynamic_archive(), "must be");
619 if ((name_size == 0 && name_offset != 0) ||
620 (name_size != 0 && name_offset == 0)) {
621 // If either is zero, both must be zero. This indicates that we are using the default base archive.
622 aot_log_warning(aot)("Invalid base_archive_name offset/size: " UINT32_FORMAT "/" UINT32_FORMAT,
623 name_offset, name_size);
624 return false;
625 }
626 if (name_size > 0) {
627 if (name_offset + name_size > header_size) {
628 aot_log_warning(aot)("Invalid base_archive_name offset/size (out of range): "
629 UINT32_FORMAT " + " UINT32_FORMAT " > " UINT32_FORMAT ,
630 name_offset, name_size, header_size);
631 return false;
632 }
633 const char* name = ((const char*)_header) + _header->_base_archive_name_offset;
634 if (name[name_size - 1] != '\0' || strlen(name) != name_size - 1) {
635 aot_log_warning(aot)("Base archive name is damaged");
636 return false;
637 }
638 if (!os::file_exists(name)) {
639 aot_log_warning(aot)("Base archive %s does not exist", name);
640 return false;
641 }
642 _base_archive_name = name;
643 }
644 }
645
646 return true;
647 }
648 };
649
650 // Return value:
651 // false:
652 // <archive_name> is not a valid archive. *base_archive_name is set to null.
653 // true && (*base_archive_name) == nullptr:
654 // <archive_name> is a valid static archive.
655 // true && (*base_archive_name) != nullptr:
656 // <archive_name> is a valid dynamic archive.
657 bool FileMapInfo::get_base_archive_name_from_header(const char* archive_name,
658 const char** base_archive_name) {
659 FileHeaderHelper file_helper(archive_name, false);
660 *base_archive_name = nullptr;
661
662 if (!file_helper.initialize()) {
663 return false;
664 }
665 GenericCDSFileMapHeader* header = file_helper.get_generic_file_header();
666 switch (header->_magic) {
667 case CDS_PREIMAGE_ARCHIVE_MAGIC:
668 return false; // This is a binary config file, not a proper archive
669 case CDS_DYNAMIC_ARCHIVE_MAGIC:
670 break;
671 default:
672 assert(header->_magic == CDS_ARCHIVE_MAGIC, "must be");
673 if (AutoCreateSharedArchive) {
674 aot_log_warning(aot)("AutoCreateSharedArchive is ignored because %s is a static archive", archive_name);
675 }
676 return true;
677 }
678
679 const char* base = file_helper.base_archive_name();
680 if (base == nullptr) {
681 *base_archive_name = CDSConfig::default_archive_path();
682 } else {
683 *base_archive_name = os::strdup_check_oom(base);
684 }
685
686 return true;
687 }
688
689 bool FileMapInfo::is_preimage_static_archive(const char* file) {
690 FileHeaderHelper file_helper(file, false);
691 if (!file_helper.initialize()) {
692 return false;
693 }
694 return file_helper.is_preimage_static_archive();
695 }
696
697 // Read the FileMapInfo information from the file.
698
699 bool FileMapInfo::init_from_file(int fd) {
700 FileHeaderHelper file_helper(_full_path, _is_static);
701 if (!file_helper.initialize(fd)) {
702 aot_log_warning(aot)("Unable to read the file header.");
703 return false;
704 }
705 GenericCDSFileMapHeader* gen_header = file_helper.get_generic_file_header();
706
707 const char* file_type = CDSConfig::type_of_archive_being_loaded();
708 if (_is_static) {
709 if ((gen_header->_magic == CDS_ARCHIVE_MAGIC) ||
710 (gen_header->_magic == CDS_PREIMAGE_ARCHIVE_MAGIC && CDSConfig::is_dumping_final_static_archive())) {
711 // Good
712 } else {
713 if (CDSConfig::new_aot_flags_used()) {
714 aot_log_warning(aot)("Not a valid %s (%s)", file_type, _full_path);
715 } else {
716 aot_log_warning(aot)("Not a base shared archive: %s", _full_path);
717 }
718 return false;
719 }
720 } else {
721 if (gen_header->_magic != CDS_DYNAMIC_ARCHIVE_MAGIC) {
722 aot_log_warning(aot)("Not a top shared archive: %s", _full_path);
723 return false;
724 }
725 }
726
727 _header = (FileMapHeader*)os::malloc(gen_header->_header_size, mtInternal);
728 os::lseek(fd, 0, SEEK_SET); // reset to begin of the archive
729 size_t size = gen_header->_header_size;
730 size_t n = ::read(fd, (void*)_header, (unsigned int)size);
731 if (n != size) {
732 aot_log_warning(aot)("Failed to read file header from the top archive file\n");
733 return false;
734 }
735
736 if (header()->version() != CURRENT_CDS_ARCHIVE_VERSION) {
737 aot_log_info(aot)("_version expected: 0x%x", CURRENT_CDS_ARCHIVE_VERSION);
738 aot_log_info(aot)(" actual: 0x%x", header()->version());
739 aot_log_warning(aot)("The %s has the wrong version.", file_type);
740 return false;
741 }
742
743 unsigned int base_offset = header()->base_archive_name_offset();
744 unsigned int name_size = header()->base_archive_name_size();
745 unsigned int header_size = header()->header_size();
746 if (base_offset != 0 && name_size != 0) {
747 if (header_size != base_offset + name_size) {
748 aot_log_info(aot)("_header_size: " UINT32_FORMAT, header_size);
749 aot_log_info(aot)("base_archive_name_size: " UINT32_FORMAT, header()->base_archive_name_size());
750 aot_log_info(aot)("base_archive_name_offset: " UINT32_FORMAT, header()->base_archive_name_offset());
751 aot_log_warning(aot)("The %s has an incorrect header size.", file_type);
752 return false;
753 }
754 }
755
756 const char* actual_ident = header()->jvm_ident();
757
758 if (actual_ident[JVM_IDENT_MAX-1] != 0) {
759 aot_log_warning(aot)("JVM version identifier is corrupted.");
760 return false;
761 }
762
763 char expected_ident[JVM_IDENT_MAX];
764 get_header_version(expected_ident);
765 if (strncmp(actual_ident, expected_ident, JVM_IDENT_MAX-1) != 0) {
766 aot_log_info(aot)("_jvm_ident expected: %s", expected_ident);
767 aot_log_info(aot)(" actual: %s", actual_ident);
768 aot_log_warning(aot)("The %s was created by a different"
769 " version or build of HotSpot", file_type);
770 return false;
771 }
772
773 _file_offset = header()->header_size(); // accounts for the size of _base_archive_name
774
775 size_t len = os::lseek(fd, 0, SEEK_END);
776
777 for (int i = 0; i < AOTMetaspace::n_regions; i++) {
778 FileMapRegion* r = region_at(i);
779 if (r->file_offset() > len || len - r->file_offset() < r->used()) {
780 aot_log_warning(aot)("The %s has been truncated.", file_type);
781 return false;
782 }
783 }
784
785 if (!header()->check_must_match_flags()) {
786 return false;
787 }
788
789 return true;
790 }
791
792 void FileMapInfo::seek_to_position(size_t pos) {
793 if (os::lseek(_fd, (long)pos, SEEK_SET) < 0) {
794 aot_log_error(aot)("Unable to seek to position %zu", pos);
795 AOTMetaspace::unrecoverable_loading_error();
796 }
797 }
798
799 // Read the FileMapInfo information from the file.
800 bool FileMapInfo::open_for_read() {
801 if (_file_open) {
802 return true;
803 }
804 const char* file_type = CDSConfig::type_of_archive_being_loaded();
805 const char* info = CDSConfig::is_dumping_final_static_archive() ?
806 "AOTConfiguration file " : "";
807 aot_log_info(aot)("trying to map %s%s", info, _full_path);
808 int fd = os::open(_full_path, O_RDONLY | O_BINARY, 0);
809 if (fd < 0) {
810 if (errno == ENOENT) {
811 aot_log_info(aot)("Specified %s not found (%s)", file_type, _full_path);
812 } else {
813 aot_log_warning(aot)("Failed to open %s (%s)", file_type,
814 os::strerror(errno));
815 }
816 return false;
817 } else {
818 aot_log_info(aot)("Opened %s %s.", file_type, _full_path);
819 }
820
821 _fd = fd;
822 _file_open = true;
823 return true;
824 }
825
826 // Write the FileMapInfo information to the file.
827
828 void FileMapInfo::open_as_output() {
829 if (CDSConfig::new_aot_flags_used()) {
830 if (CDSConfig::is_dumping_preimage_static_archive()) {
831 log_info(aot)("Writing binary AOTConfiguration file: %s", _full_path);
832 } else {
833 log_info(aot)("Writing AOTCache file: %s", _full_path);
834 }
835 } else {
836 aot_log_info(aot)("Dumping shared data to file: %s", _full_path);
837 }
838
839 #ifdef _WINDOWS // On Windows, need WRITE permission to remove the file.
840 chmod(_full_path, _S_IREAD | _S_IWRITE);
841 #endif
842
843 // Use remove() to delete the existing file because, on Unix, this will
844 // allow processes that have it open continued access to the file.
845 remove(_full_path);
846 int fd = os::open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0666);
847 if (fd < 0) {
848 aot_log_error(aot)("Unable to create %s %s: (%s).", CDSConfig::type_of_archive_being_written(), _full_path,
849 os::strerror(errno));
850 AOTMetaspace::writing_error();
851 return;
852 }
853 _fd = fd;
854 _file_open = true;
855 }
856
857 void FileMapInfo::prepare_for_writing() {
858 // Seek past the header. We will write the header after all regions are written
859 // and their CRCs computed.
860 size_t header_bytes = header()->header_size();
861
862 header_bytes = align_up(header_bytes, AOTMetaspace::core_region_alignment());
863 _file_offset = header_bytes;
864 seek_to_position(_file_offset);
865 }
866
867 // Write the header to the file, seek to the next allocation boundary.
868
869 void FileMapInfo::write_header() {
870 _file_offset = 0;
871 seek_to_position(_file_offset);
872 assert(is_file_position_aligned(), "must be");
873 write_bytes(header(), header()->header_size());
874 }
875
876 size_t FileMapRegion::used_aligned() const {
877 return align_up(used(), AOTMetaspace::core_region_alignment());
878 }
879
880 void FileMapRegion::init(int region_index, size_t mapping_offset, size_t size, bool read_only,
881 bool allow_exec, int crc) {
882 _is_heap_region = HeapShared::is_heap_region(region_index);
883 _is_bitmap_region = (region_index == AOTMetaspace::bm);
884 _mapping_offset = mapping_offset;
885 _used = size;
886 _read_only = read_only;
887 _allow_exec = allow_exec;
888 _crc = crc;
889 _mapped_from_file = false;
890 _mapped_base = nullptr;
891 _in_reserved_space = false;
892 }
893
894 void FileMapRegion::init_oopmap(size_t offset, size_t size_in_bits) {
895 _oopmap_offset = offset;
896 _oopmap_size_in_bits = size_in_bits;
897 }
898
899 void FileMapRegion::init_ptrmap(size_t offset, size_t size_in_bits) {
900 _ptrmap_offset = offset;
901 _ptrmap_size_in_bits = size_in_bits;
902 }
903
904 bool FileMapRegion::check_region_crc(char* base) const {
905 // This function should be called after the region has been properly
906 // loaded into memory via FileMapInfo::map_region() or FileMapInfo::read_region().
907 // I.e., this->mapped_base() must be valid.
908 size_t sz = used();
909 if (sz == 0) {
910 return true;
911 }
912
913 assert(base != nullptr, "must be initialized");
914 int crc = ClassLoader::crc32(0, base, (jint)sz);
915 if (crc != this->crc()) {
916 aot_log_warning(aot)("Checksum verification failed.");
917 return false;
918 }
919 return true;
920 }
921
922 static const char* region_name(int region_index) {
923 static const char* names[] = {
924 "rw", "ro", "bm", "hp", "ac"
925 };
926 const int num_regions = sizeof(names)/sizeof(names[0]);
927 assert(0 <= region_index && region_index < num_regions, "sanity");
928
929 return names[region_index];
930 }
931
932 BitMapView FileMapInfo::bitmap_view(int region_index, bool is_oopmap) {
933 FileMapRegion* r = region_at(region_index);
934 char* bitmap_base = is_static() ? FileMapInfo::current_info()->map_bitmap_region() : FileMapInfo::dynamic_info()->map_bitmap_region();
935 bitmap_base += is_oopmap ? r->oopmap_offset() : r->ptrmap_offset();
936 size_t size_in_bits = is_oopmap ? r->oopmap_size_in_bits() : r->ptrmap_size_in_bits();
937
938 aot_log_debug(aot, reloc)("mapped %s relocation %smap @ " INTPTR_FORMAT " (%zu bits)",
939 region_name(region_index), is_oopmap ? "oop" : "ptr",
940 p2i(bitmap_base), size_in_bits);
941
942 return BitMapView((BitMap::bm_word_t*)(bitmap_base), size_in_bits);
943 }
944
945 BitMapView FileMapInfo::oopmap_view(int region_index) {
946 return bitmap_view(region_index, /*is_oopmap*/true);
947 }
948
949 BitMapView FileMapInfo::ptrmap_view(int region_index) {
950 return bitmap_view(region_index, /*is_oopmap*/false);
951 }
952
953 void FileMapRegion::print(outputStream* st, int region_index) {
954 st->print_cr("============ region ============= %d \"%s\"", region_index, region_name(region_index));
955 st->print_cr("- crc: 0x%08x", _crc);
956 st->print_cr("- read_only: %d", _read_only);
957 st->print_cr("- allow_exec: %d", _allow_exec);
958 st->print_cr("- is_heap_region: %d", _is_heap_region);
959 st->print_cr("- is_bitmap_region: %d", _is_bitmap_region);
960 st->print_cr("- mapped_from_file: %d", _mapped_from_file);
961 st->print_cr("- file_offset: 0x%zx", _file_offset);
962 st->print_cr("- mapping_offset: 0x%zx", _mapping_offset);
963 st->print_cr("- used: %zu", _used);
964 st->print_cr("- oopmap_offset: 0x%zx", _oopmap_offset);
965 st->print_cr("- oopmap_size_in_bits: %zu", _oopmap_size_in_bits);
966 st->print_cr("- ptrmap_offset: 0x%zx", _ptrmap_offset);
967 st->print_cr("- ptrmap_size_in_bits: %zu", _ptrmap_size_in_bits);
968 st->print_cr("- mapped_base: " INTPTR_FORMAT, p2i(_mapped_base));
969 }
970
971 void FileMapInfo::write_region(int region, char* base, size_t size,
972 bool read_only, bool allow_exec) {
973 assert(CDSConfig::is_dumping_archive(), "sanity");
974
975 FileMapRegion* r = region_at(region);
976 char* requested_base;
977 size_t mapping_offset = 0;
978
979 if (region == AOTMetaspace::bm) {
980 requested_base = nullptr; // always null for bm region
981 } else if (size == 0) {
982 // This is an unused region (e.g., a heap region when !INCLUDE_CDS_JAVA_HEAP)
983 requested_base = nullptr;
984 } else if (HeapShared::is_heap_region(region)) {
985 assert(CDSConfig::is_dumping_heap(), "sanity");
986 #if INCLUDE_CDS_JAVA_HEAP
987 assert(!CDSConfig::is_dumping_dynamic_archive(), "must be");
988 if (HeapShared::is_writing_mapping_mode()) {
989 requested_base = (char*)AOTMappedHeapWriter::requested_address();
990 if (UseCompressedOops) {
991 mapping_offset = (size_t)((address)requested_base - AOTMappedHeapWriter::narrow_oop_base());
992 assert((mapping_offset >> CompressedOops::shift()) << CompressedOops::shift() == mapping_offset, "must be");
993 }
994 } else {
995 requested_base = nullptr;
996 }
997 #endif // INCLUDE_CDS_JAVA_HEAP
998 } else {
999 char* requested_SharedBaseAddress = (char*)AOTMetaspace::requested_base_address();
1000 requested_base = ArchiveBuilder::current()->to_requested(base);
1001 assert(requested_base >= requested_SharedBaseAddress, "must be");
1002 mapping_offset = requested_base - requested_SharedBaseAddress;
1003 }
1004
1005 r->set_file_offset(_file_offset);
1006 int crc = ClassLoader::crc32(0, base, (jint)size);
1007 if (size > 0) {
1008 aot_log_info(aot)("Shared file region (%s) %d: %8zu"
1009 " bytes, addr " INTPTR_FORMAT " file offset 0x%08" PRIxPTR
1010 " crc 0x%08x",
1011 region_name(region), region, size, p2i(requested_base), _file_offset, crc);
1012 } else {
1013 aot_log_info(aot)("Shared file region (%s) %d: %8zu"
1014 " bytes", region_name(region), region, size);
1015 }
1016
1017 r->init(region, mapping_offset, size, read_only, allow_exec, crc);
1018
1019 if (base != nullptr) {
1020 write_bytes_aligned(base, size);
1021 }
1022 }
1023
1024 static size_t write_bitmap(const CHeapBitMap* map, char* output, size_t offset) {
1025 size_t size_in_bytes = map->size_in_bytes();
1026 map->write_to((BitMap::bm_word_t*)(output + offset), size_in_bytes);
1027 return offset + size_in_bytes;
1028 }
1029
1030 // The sorting code groups the objects with non-null oop/ptrs together.
1031 // Relevant bitmaps then have lots of leading and trailing zeros, which
1032 // we do not have to store.
1033 size_t FileMapInfo::remove_bitmap_zeros(CHeapBitMap* map) {
1034 BitMap::idx_t first_set = map->find_first_set_bit(0);
1035 BitMap::idx_t last_set = map->find_last_set_bit(0);
1036 size_t old_size = map->size();
1037
1038 // Slice and resize bitmap
1039 map->truncate(first_set, last_set + 1);
1040
1041 assert(map->at(0), "First bit should be set");
1042 assert(map->at(map->size() - 1), "Last bit should be set");
1043 assert(map->size() <= old_size, "sanity");
1044
1045 return first_set;
1046 }
1047
1048 char* FileMapInfo::write_bitmap_region(CHeapBitMap* rw_ptrmap,
1049 CHeapBitMap* ro_ptrmap,
1050 ArchiveMappedHeapInfo* mapped_heap_info,
1051 ArchiveStreamedHeapInfo* streamed_heap_info,
1052 size_t &size_in_bytes) {
1053 size_t removed_rw_leading_zeros = remove_bitmap_zeros(rw_ptrmap);
1054 size_t removed_ro_leading_zeros = remove_bitmap_zeros(ro_ptrmap);
1055 header()->set_rw_ptrmap_start_pos(removed_rw_leading_zeros);
1056 header()->set_ro_ptrmap_start_pos(removed_ro_leading_zeros);
1057 size_in_bytes = rw_ptrmap->size_in_bytes() + ro_ptrmap->size_in_bytes();
1058
1059 if (mapped_heap_info != nullptr && mapped_heap_info->is_used()) {
1060 // Remove leading and trailing zeros
1061 assert(HeapShared::is_writing_mapping_mode(), "unexpected dumping mode");
1062 size_t removed_oop_leading_zeros = remove_bitmap_zeros(mapped_heap_info->oopmap());
1063 size_t removed_ptr_leading_zeros = remove_bitmap_zeros(mapped_heap_info->ptrmap());
1064 mapped_heap_info->set_oopmap_start_pos(removed_oop_leading_zeros);
1065 mapped_heap_info->set_ptrmap_start_pos(removed_ptr_leading_zeros);
1066
1067 size_in_bytes += mapped_heap_info->oopmap()->size_in_bytes();
1068 size_in_bytes += mapped_heap_info->ptrmap()->size_in_bytes();
1069 } else if (streamed_heap_info != nullptr && streamed_heap_info->is_used()) {
1070 assert(HeapShared::is_writing_streaming_mode(), "unexpected dumping mode");
1071
1072 size_in_bytes += streamed_heap_info->oopmap()->size_in_bytes();
1073 }
1074
1075 // The bitmap region contains up to 4 parts:
1076 // rw_ptrmap: metaspace pointers inside the read-write region
1077 // ro_ptrmap: metaspace pointers inside the read-only region
1078 // *_heap_info->oopmap(): Java oop pointers in the heap region
1079 // mapped_heap_info->ptrmap(): metaspace pointers in the heap region
1080 char* buffer = NEW_C_HEAP_ARRAY(char, size_in_bytes, mtClassShared);
1081 size_t written = 0;
1082
1083 region_at(AOTMetaspace::rw)->init_ptrmap(0, rw_ptrmap->size());
1084 written = write_bitmap(rw_ptrmap, buffer, written);
1085
1086 region_at(AOTMetaspace::ro)->init_ptrmap(written, ro_ptrmap->size());
1087 written = write_bitmap(ro_ptrmap, buffer, written);
1088
1089 if (mapped_heap_info != nullptr && mapped_heap_info->is_used()) {
1090 assert(HeapShared::is_writing_mapping_mode(), "unexpected dumping mode");
1091 FileMapRegion* r = region_at(AOTMetaspace::hp);
1092
1093 r->init_oopmap(written, mapped_heap_info->oopmap()->size());
1094 written = write_bitmap(mapped_heap_info->oopmap(), buffer, written);
1095
1096 r->init_ptrmap(written, mapped_heap_info->ptrmap()->size());
1097 written = write_bitmap(mapped_heap_info->ptrmap(), buffer, written);
1098 } else if (streamed_heap_info != nullptr && streamed_heap_info->is_used()) {
1099 assert(HeapShared::is_writing_streaming_mode(), "unexpected dumping mode");
1100 FileMapRegion* r = region_at(AOTMetaspace::hp);
1101
1102 r->init_oopmap(written, streamed_heap_info->oopmap()->size());
1103 written = write_bitmap(streamed_heap_info->oopmap(), buffer, written);
1104 }
1105
1106 write_region(AOTMetaspace::bm, (char*)buffer, size_in_bytes, /*read_only=*/true, /*allow_exec=*/false);
1107 return buffer;
1108 }
1109
1110 #if INCLUDE_CDS_JAVA_HEAP
1111 size_t FileMapInfo::write_mapped_heap_region(ArchiveMappedHeapInfo* heap_info) {
1112 char* buffer_start = heap_info->buffer_start();
1113 size_t buffer_size = heap_info->buffer_byte_size();
1114 write_region(AOTMetaspace::hp, buffer_start, buffer_size, false, false);
1115 header()->set_mapped_heap_header(heap_info->create_header());
1116 return buffer_size;
1117 }
1118
1119 size_t FileMapInfo::write_streamed_heap_region(ArchiveStreamedHeapInfo* heap_info) {
1120 char* buffer_start = heap_info->buffer_start();
1121 size_t buffer_size = heap_info->buffer_byte_size();
1122 write_region(AOTMetaspace::hp, buffer_start, buffer_size, true, false);
1123 header()->set_streamed_heap_header(heap_info->create_header());
1124 return buffer_size;
1125 }
1126 #endif // INCLUDE_CDS_JAVA_HEAP
1127
1128 // Dump bytes to file -- at the current file position.
1129
1130 void FileMapInfo::write_bytes(const void* buffer, size_t nbytes) {
1131 assert(_file_open, "must be");
1132 if (!os::write(_fd, buffer, nbytes)) {
1133 // If the shared archive is corrupted, close it and remove it.
1134 close();
1135 remove(_full_path);
1136
1137 if (CDSConfig::is_dumping_preimage_static_archive()) {
1138 AOTMetaspace::writing_error("Unable to write to AOT configuration file.");
1139 } else if (CDSConfig::new_aot_flags_used()) {
1140 AOTMetaspace::writing_error("Unable to write to AOT cache.");
1141 } else {
1142 AOTMetaspace::writing_error("Unable to write to shared archive.");
1143 }
1144 }
1145 _file_offset += nbytes;
1146 }
1147
1148 bool FileMapInfo::is_file_position_aligned() const {
1149 return _file_offset == align_up(_file_offset,
1150 AOTMetaspace::core_region_alignment());
1151 }
1152
1153 // Align file position to an allocation unit boundary.
1154
1155 void FileMapInfo::align_file_position() {
1156 assert(_file_open, "must be");
1157 size_t new_file_offset = align_up(_file_offset,
1158 AOTMetaspace::core_region_alignment());
1159 if (new_file_offset != _file_offset) {
1160 _file_offset = new_file_offset;
1161 // Seek one byte back from the target and write a byte to insure
1162 // that the written file is the correct length.
1163 _file_offset -= 1;
1164 seek_to_position(_file_offset);
1165 char zero = 0;
1166 write_bytes(&zero, 1);
1167 }
1168 }
1169
1170
1171 // Dump bytes to file -- at the current file position.
1172
1173 void FileMapInfo::write_bytes_aligned(const void* buffer, size_t nbytes) {
1174 align_file_position();
1175 write_bytes(buffer, nbytes);
1176 align_file_position();
1177 }
1178
1179 // Close the shared archive file. This does NOT unmap mapped regions.
1180
1181 void FileMapInfo::close() {
1182 if (_file_open) {
1183 if (::close(_fd) < 0) {
1184 AOTMetaspace::unrecoverable_loading_error("Unable to close the shared archive file.");
1185 }
1186 _file_open = false;
1187 _fd = -1;
1188 }
1189 }
1190
1191 /*
1192 * Same as os::map_memory() but also pretouches if AlwaysPreTouch is enabled.
1193 */
1194 static char* map_memory(int fd, const char* file_name, size_t file_offset,
1195 char* addr, size_t bytes, bool read_only,
1196 bool allow_exec, MemTag mem_tag) {
1197 char* mem = os::map_memory(fd, file_name, file_offset, addr, bytes,
1198 mem_tag, AlwaysPreTouch ? false : read_only,
1199 allow_exec);
1200 if (mem != nullptr && AlwaysPreTouch) {
1201 os::pretouch_memory(mem, mem + bytes);
1202 }
1203 return mem;
1204 }
1205
1206 char* FileMapInfo::map_heap_region(FileMapRegion* r, char* addr, size_t bytes) {
1207 return ::map_memory(_fd,
1208 _full_path,
1209 r->file_offset(),
1210 addr,
1211 bytes,
1212 r->read_only(),
1213 r->allow_exec(),
1214 mtJavaHeap);
1215 }
1216
1217 // JVM/TI RedefineClasses() support:
1218 // Remap the shared readonly space to shared readwrite, private.
1219 bool FileMapInfo::remap_shared_readonly_as_readwrite() {
1220 int idx = AOTMetaspace::ro;
1221 FileMapRegion* r = region_at(idx);
1222 if (!r->read_only()) {
1223 // the space is already readwrite so we are done
1224 return true;
1225 }
1226 size_t size = r->used_aligned();
1227 if (!open_for_read()) {
1228 return false;
1229 }
1230 char *addr = r->mapped_base();
1231 // This path should not be reached for Windows; see JDK-8222379.
1232 assert(WINDOWS_ONLY(false) NOT_WINDOWS(true), "Don't call on Windows");
1233 // Replace old mapping with new one that is writable.
1234 char *base = os::map_memory(_fd, _full_path, r->file_offset(),
1235 addr, size, mtNone, false /* !read_only */,
1236 r->allow_exec());
1237 close();
1238 // These have to be errors because the shared region is now unmapped.
1239 if (base == nullptr) {
1240 aot_log_error(aot)("Unable to remap shared readonly space (errno=%d).", errno);
1241 vm_exit(1);
1242 }
1243 if (base != addr) {
1244 aot_log_error(aot)("Unable to remap shared readonly space (errno=%d).", errno);
1245 vm_exit(1);
1246 }
1247 r->set_read_only(false);
1248 return true;
1249 }
1250
1251 // Memory map a region in the address space.
1252 static const char* shared_region_name[] = { "ReadWrite", "ReadOnly", "Bitmap", "Heap", "Code" };
1253
1254 MapArchiveResult FileMapInfo::map_regions(int regions[], int num_regions, char* mapped_base_address, ReservedSpace rs) {
1255 DEBUG_ONLY(FileMapRegion* last_region = nullptr);
1256 intx addr_delta = mapped_base_address - header()->requested_base_address();
1257
1258 // Make sure we don't attempt to use header()->mapped_base_address() unless
1259 // it's been successfully mapped.
1260 DEBUG_ONLY(header()->set_mapped_base_address((char*)(uintptr_t)0xdeadbeef);)
1261
1262 for (int i = 0; i < num_regions; i++) {
1263 int idx = regions[i];
1264 MapArchiveResult result = map_region(idx, addr_delta, mapped_base_address, rs);
1265 if (result != MAP_ARCHIVE_SUCCESS) {
1266 return result;
1267 }
1268 FileMapRegion* r = region_at(idx);
1269 DEBUG_ONLY(if (last_region != nullptr) {
1270 // Ensure that the OS won't be able to allocate new memory spaces between any mapped
1271 // regions, or else it would mess up the simple comparison in MetaspaceObj::in_aot_cache().
1272 assert(r->mapped_base() == last_region->mapped_end(), "must have no gaps");
1273 }
1274 last_region = r;)
1275 aot_log_info(aot)("Mapped %s region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)", is_static() ? "static " : "dynamic",
1276 idx, p2i(r->mapped_base()), p2i(r->mapped_end()),
1277 shared_region_name[idx]);
1278
1279 }
1280
1281 header()->set_mapped_base_address(header()->requested_base_address() + addr_delta);
1282 if (addr_delta != 0 && !relocate_pointers_in_core_regions(addr_delta)) {
1283 return MAP_ARCHIVE_OTHER_FAILURE;
1284 }
1285
1286 return MAP_ARCHIVE_SUCCESS;
1287 }
1288
1289 bool FileMapInfo::read_region(int i, char* base, size_t size, bool do_commit) {
1290 FileMapRegion* r = region_at(i);
1291 if (do_commit) {
1292 aot_log_info(aot)("Commit %s region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)%s",
1293 is_static() ? "static " : "dynamic", i, p2i(base), p2i(base + size),
1294 shared_region_name[i], r->allow_exec() ? " exec" : "");
1295 if (!os::commit_memory(base, size, r->allow_exec())) {
1296 aot_log_error(aot)("Failed to commit %s region #%d (%s)", is_static() ? "static " : "dynamic",
1297 i, shared_region_name[i]);
1298 return false;
1299 }
1300 }
1301 if (os::lseek(_fd, (long)r->file_offset(), SEEK_SET) != (int)r->file_offset() ||
1302 read_bytes(base, size) != size) {
1303 return false;
1304 }
1305
1306 if (VerifySharedSpaces && !r->check_region_crc(base)) {
1307 return false;
1308 }
1309
1310 r->set_mapped_from_file(false);
1311 r->set_mapped_base(base);
1312
1313 return true;
1314 }
1315
1316 MapArchiveResult FileMapInfo::map_region(int i, intx addr_delta, char* mapped_base_address, ReservedSpace rs) {
1317 assert(!HeapShared::is_heap_region(i), "sanity");
1318 FileMapRegion* r = region_at(i);
1319 size_t size = r->used_aligned();
1320 char *requested_addr = mapped_base_address + r->mapping_offset();
1321 assert(!is_mapped(), "must be not mapped yet");
1322 assert(requested_addr != nullptr, "must be specified");
1323
1324 r->set_mapped_from_file(false);
1325 r->set_in_reserved_space(false);
1326
1327 if (AOTMetaspace::use_windows_memory_mapping()) {
1328 // Windows cannot remap read-only shared memory to read-write when required for
1329 // RedefineClasses, which is also used by JFR. Always map windows regions as RW.
1330 r->set_read_only(false);
1331 } else if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space() ||
1332 Arguments::has_jfr_option()) {
1333 // If a tool agent is in use (debugging enabled), or JFR, we must map the address space RW
1334 r->set_read_only(false);
1335 } else if (addr_delta != 0) {
1336 r->set_read_only(false); // Need to patch the pointers
1337 }
1338
1339 if (AOTMetaspace::use_windows_memory_mapping() && rs.is_reserved()) {
1340 // This is the second time we try to map the archive(s). We have already created a ReservedSpace
1341 // that covers all the FileMapRegions to ensure all regions can be mapped. However, Windows
1342 // can't mmap into a ReservedSpace, so we just ::read() the data. We're going to patch all the
1343 // regions anyway, so there's no benefit for mmap anyway.
1344 if (!read_region(i, requested_addr, size, /* do_commit = */ true)) {
1345 AOTMetaspace::report_loading_error("Failed to read %s shared space into reserved space at " INTPTR_FORMAT,
1346 shared_region_name[i], p2i(requested_addr));
1347 return MAP_ARCHIVE_OTHER_FAILURE; // oom or I/O error.
1348 } else {
1349 assert(r->mapped_base() != nullptr, "must be initialized");
1350 }
1351 } else {
1352 // Note that this may either be a "fresh" mapping into unreserved address
1353 // space (Windows, first mapping attempt), or a mapping into pre-reserved
1354 // space (Posix). See also comment in AOTMetaspace::map_archives().
1355 char* base = map_memory(_fd, _full_path, r->file_offset(),
1356 requested_addr, size, r->read_only(),
1357 r->allow_exec(), mtClassShared);
1358 if (base != requested_addr) {
1359 AOTMetaspace::report_loading_error("Unable to map %s shared space at " INTPTR_FORMAT,
1360 shared_region_name[i], p2i(requested_addr));
1361 _memory_mapping_failed = true;
1362 return MAP_ARCHIVE_MMAP_FAILURE;
1363 }
1364
1365 if (VerifySharedSpaces && !r->check_region_crc(requested_addr)) {
1366 return MAP_ARCHIVE_OTHER_FAILURE;
1367 }
1368
1369 r->set_mapped_from_file(true);
1370 r->set_mapped_base(requested_addr);
1371 }
1372
1373 if (rs.is_reserved()) {
1374 char* mapped_base = r->mapped_base();
1375 assert(rs.base() <= mapped_base && mapped_base + size <= rs.end(),
1376 PTR_FORMAT " <= " PTR_FORMAT " < " PTR_FORMAT " <= " PTR_FORMAT,
1377 p2i(rs.base()), p2i(mapped_base), p2i(mapped_base + size), p2i(rs.end()));
1378 r->set_in_reserved_space(rs.is_reserved());
1379 }
1380 return MAP_ARCHIVE_SUCCESS;
1381 }
1382
1383 // The return value is the location of the archive relocation bitmap.
1384 char* FileMapInfo::map_auxiliary_region(int region_index, bool read_only) {
1385 FileMapRegion* r = region_at(region_index);
1386 if (r->mapped_base() != nullptr) {
1387 return r->mapped_base();
1388 }
1389 const char* region_name = shared_region_name[region_index];
1390 bool allow_exec = false;
1391 char* requested_addr = nullptr; // allow OS to pick any location
1392 char* mapped_base = map_memory(_fd, _full_path, r->file_offset(),
1393 requested_addr, r->used_aligned(), read_only, allow_exec, mtClassShared);
1394 if (mapped_base == nullptr) {
1395 AOTMetaspace::report_loading_error("failed to map %d region", region_index);
1396 return nullptr;
1397 }
1398
1399 if (VerifySharedSpaces && !r->check_region_crc(mapped_base)) {
1400 aot_log_error(aot)("region %d CRC error", region_index);
1401 if (!os::unmap_memory(mapped_base, r->used_aligned())) {
1402 fatal("os::unmap_memory of region %d failed", region_index);
1403 }
1404 return nullptr;
1405 }
1406
1407 r->set_mapped_from_file(true);
1408 r->set_mapped_base(mapped_base);
1409 aot_log_info(aot)("Mapped %s region #%d at base %zu top %zu (%s)",
1410 is_static() ? "static " : "dynamic",
1411 region_index, p2i(r->mapped_base()), p2i(r->mapped_end()),
1412 region_name);
1413 return mapped_base;
1414 }
1415
1416 char* FileMapInfo::map_bitmap_region() {
1417 return map_auxiliary_region(AOTMetaspace::bm, false);
1418 }
1419
1420 bool FileMapInfo::map_aot_code_region(ReservedSpace rs) {
1421 FileMapRegion* r = region_at(AOTMetaspace::ac);
1422 assert(r->used() > 0 && r->used_aligned() == rs.size(), "must be");
1423
1424 char* requested_base = rs.base();
1425 assert(requested_base != nullptr, "should be inside code cache");
1426
1427 char* mapped_base;
1428 if (AOTMetaspace::use_windows_memory_mapping()) {
1429 if (!read_region(AOTMetaspace::ac, requested_base, r->used_aligned(), /* do_commit = */ true)) {
1430 AOTMetaspace::report_loading_error("Failed to read aot code shared space into reserved space at " INTPTR_FORMAT,
1431 p2i(requested_base));
1432 return false;
1433 }
1434 mapped_base = requested_base;
1435 } else {
1436 // We do not execute in-place in the AOT code region.
1437 // AOT code is copied to the CodeCache for execution.
1438 bool read_only = false, allow_exec = false;
1439 mapped_base = map_memory(_fd, _full_path, r->file_offset(),
1440 requested_base, r->used_aligned(), read_only, allow_exec, mtClassShared);
1441 }
1442 if (mapped_base == nullptr) {
1443 AOTMetaspace::report_loading_error("failed to map aot code region");
1444 return false;
1445 } else {
1446 assert(mapped_base == requested_base, "must be");
1447 r->set_mapped_from_file(true);
1448 r->set_mapped_base(mapped_base);
1449 aot_log_info(aot)("Mapped static region #%d at base " INTPTR_FORMAT " top " INTPTR_FORMAT " (%s)",
1450 AOTMetaspace::ac, p2i(r->mapped_base()), p2i(r->mapped_end()),
1451 shared_region_name[AOTMetaspace::ac]);
1452 return true;
1453 }
1454 }
1455
1456 class SharedDataRelocationTask : public ArchiveWorkerTask {
1457 private:
1458 BitMapView* const _rw_bm;
1459 BitMapView* const _ro_bm;
1460 SharedDataRelocator* const _rw_reloc;
1461 SharedDataRelocator* const _ro_reloc;
1462
1463 public:
1464 SharedDataRelocationTask(BitMapView* rw_bm, BitMapView* ro_bm, SharedDataRelocator* rw_reloc, SharedDataRelocator* ro_reloc) :
1465 ArchiveWorkerTask("Shared Data Relocation"),
1466 _rw_bm(rw_bm), _ro_bm(ro_bm), _rw_reloc(rw_reloc), _ro_reloc(ro_reloc) {}
1467
1468 void work(int chunk, int max_chunks) override {
1469 work_on(chunk, max_chunks, _rw_bm, _rw_reloc);
1470 work_on(chunk, max_chunks, _ro_bm, _ro_reloc);
1471 }
1472
1473 void work_on(int chunk, int max_chunks, BitMapView* bm, SharedDataRelocator* reloc) {
1474 BitMap::idx_t size = bm->size();
1475 BitMap::idx_t start = MIN2(size, size * chunk / max_chunks);
1476 BitMap::idx_t end = MIN2(size, size * (chunk + 1) / max_chunks);
1477 assert(end > start, "Sanity: no empty slices");
1478 bm->iterate(reloc, start, end);
1479 }
1480 };
1481
1482 // This is called when we cannot map the archive at the requested[ base address (usually 0x800000000).
1483 // We relocate all pointers in the 2 core regions (ro, rw).
1484 bool FileMapInfo::relocate_pointers_in_core_regions(intx addr_delta) {
1485 aot_log_debug(aot, reloc)("runtime archive relocation start");
1486 char* bitmap_base = map_bitmap_region();
1487
1488 if (bitmap_base == nullptr) {
1489 return false; // OOM, or CRC check failure
1490 } else {
1491 BitMapView rw_ptrmap = ptrmap_view(AOTMetaspace::rw);
1492 BitMapView ro_ptrmap = ptrmap_view(AOTMetaspace::ro);
1493
1494 FileMapRegion* rw_region = first_core_region();
1495 FileMapRegion* ro_region = last_core_region();
1496
1497 // Patch all pointers inside the RW region
1498 address rw_patch_base = (address)rw_region->mapped_base();
1499 address rw_patch_end = (address)rw_region->mapped_end();
1500
1501 // Patch all pointers inside the RO region
1502 address ro_patch_base = (address)ro_region->mapped_base();
1503 address ro_patch_end = (address)ro_region->mapped_end();
1504
1505 // the current value of the pointers to be patched must be within this
1506 // range (i.e., must be between the requested base address and the address of the current archive).
1507 // Note: top archive may point to objects in the base archive, but not the other way around.
1508 address valid_old_base = (address)header()->requested_base_address();
1509 address valid_old_end = valid_old_base + mapping_end_offset();
1510
1511 // after patching, the pointers must point inside this range
1512 // (the requested location of the archive, as mapped at runtime).
1513 address valid_new_base = (address)header()->mapped_base_address();
1514 address valid_new_end = (address)mapped_end();
1515
1516 SharedDataRelocator rw_patcher((address*)rw_patch_base + header()->rw_ptrmap_start_pos(), (address*)rw_patch_end, valid_old_base, valid_old_end,
1517 valid_new_base, valid_new_end, addr_delta);
1518 SharedDataRelocator ro_patcher((address*)ro_patch_base + header()->ro_ptrmap_start_pos(), (address*)ro_patch_end, valid_old_base, valid_old_end,
1519 valid_new_base, valid_new_end, addr_delta);
1520
1521 if (AOTCacheParallelRelocation) {
1522 ArchiveWorkers workers;
1523 SharedDataRelocationTask task(&rw_ptrmap, &ro_ptrmap, &rw_patcher, &ro_patcher);
1524 workers.run_task(&task);
1525 } else {
1526 rw_ptrmap.iterate(&rw_patcher);
1527 ro_ptrmap.iterate(&ro_patcher);
1528 }
1529
1530 // The AOTMetaspace::bm region will be unmapped in AOTMetaspace::initialize_shared_spaces().
1531
1532 aot_log_debug(aot, reloc)("runtime archive relocation done");
1533 return true;
1534 }
1535 }
1536
1537 size_t FileMapInfo::read_bytes(void* buffer, size_t count) {
1538 assert(_file_open, "Archive file is not open");
1539 size_t n = ::read(_fd, buffer, (unsigned int)count);
1540 if (n != count) {
1541 // Close the file if there's a problem reading it.
1542 close();
1543 return 0;
1544 }
1545 _file_offset += count;
1546 return count;
1547 }
1548
1549 // Get the total size in bytes of a read only region
1550 size_t FileMapInfo::readonly_total() {
1551 size_t total = 0;
1552 if (current_info() != nullptr) {
1553 FileMapRegion* r = FileMapInfo::current_info()->region_at(AOTMetaspace::ro);
1554 if (r->read_only()) total += r->used();
1555 }
1556 if (dynamic_info() != nullptr) {
1557 FileMapRegion* r = FileMapInfo::dynamic_info()->region_at(AOTMetaspace::ro);
1558 if (r->read_only()) total += r->used();
1559 }
1560 return total;
1561 }
1562
1563 #if INCLUDE_CDS_JAVA_HEAP
1564
1565 bool FileMapInfo::has_heap_region() {
1566 return (region_at(AOTMetaspace::hp)->used() > 0);
1567 }
1568
1569 static void on_heap_region_loading_error() {
1570 if (CDSConfig::is_using_aot_linked_classes()) {
1571 // It's too late to recover -- we have already committed to use the archived metaspace objects, but
1572 // the archived heap objects cannot be loaded, so we don't have the archived FMG to guarantee that
1573 // all AOT-linked classes are visible.
1574 //
1575 // We get here because the heap is too small. The app will fail anyway. So let's quit.
1576 aot_log_error(aot)("%s has aot-linked classes but the archived "
1577 "heap objects cannot be loaded. Try increasing your heap size.",
1578 CDSConfig::type_of_archive_being_loaded());
1579 AOTMetaspace::unrecoverable_loading_error();
1580 }
1581 CDSConfig::stop_using_full_module_graph();
1582 }
1583
1584 void FileMapInfo::stream_heap_region() {
1585 assert(object_streaming_mode(), "This should only be done for the streaming approach");
1586
1587 if (map_auxiliary_region(AOTMetaspace::hp, /*readonly=*/true) != nullptr) {
1588 HeapShared::initialize_streaming();
1589 } else {
1590 on_heap_region_loading_error();
1591 }
1592 }
1593
1594 void FileMapInfo::map_or_load_heap_region() {
1595 assert(!object_streaming_mode(), "This should only be done for the mapping approach");
1596 bool success = false;
1597
1598 if (AOTMappedHeapLoader::can_map()) {
1599 success = AOTMappedHeapLoader::map_heap_region(this);
1600 } else if (AOTMappedHeapLoader::can_load()) {
1601 success = AOTMappedHeapLoader::load_heap_region(this);
1602 }
1603
1604 if (!success) {
1605 on_heap_region_loading_error();
1606 }
1607 }
1608
1609 bool FileMapInfo::can_use_heap_region() {
1610 if (!has_heap_region()) {
1611 return false;
1612 }
1613 if (!object_streaming_mode() && !Universe::heap()->can_load_archived_objects() && !UseG1GC) {
1614 // Incompatible object format
1615 return false;
1616 }
1617 if (JvmtiExport::should_post_class_file_load_hook() && JvmtiExport::has_early_class_hook_env()) {
1618 ShouldNotReachHere(); // CDS should have been disabled.
1619 // The archived objects are mapped at JVM start-up, but we don't know if
1620 // j.l.String or j.l.Class might be replaced by the ClassFileLoadHook,
1621 // which would make the archived String or mirror objects invalid. Let's be safe and not
1622 // use the archived objects. These 2 classes are loaded during the JVMTI "early" stage.
1623 //
1624 // If JvmtiExport::has_early_class_hook_env() is false, the classes of some objects
1625 // in the archived subgraphs may be replaced by the ClassFileLoadHook. But that's OK
1626 // because we won't install an archived object subgraph if the klass of any of the
1627 // referenced objects are replaced. See HeapShared::initialize_from_archived_subgraph().
1628 }
1629
1630 // We pre-compute narrow Klass IDs with the runtime mapping start intended to be the base, and a shift of
1631 // HeapShared::precomputed_narrow_klass_shift. We enforce this encoding at runtime (see
1632 // CompressedKlassPointers::initialize_for_given_encoding()). Therefore, the following assertions must
1633 // hold:
1634 address archive_narrow_klass_base = (address)header()->mapped_base_address();
1635 const int archive_narrow_klass_pointer_bits = header()->narrow_klass_pointer_bits();
1636 const int archive_narrow_klass_shift = header()->narrow_klass_shift();
1637
1638 aot_log_info(aot)("CDS archive was created with max heap size = %zuM, and the following configuration:",
1639 max_heap_size()/M);
1640
1641 aot_log_info(aot)(" narrow_klass_base at mapping start address, narrow_klass_pointer_bits = %d, narrow_klass_shift = %d",
1642 archive_narrow_klass_pointer_bits, archive_narrow_klass_shift);
1643 if (UseCompressedOops) {
1644 aot_log_info(aot)(" narrow_oop_mode = %d, narrow_oop_base = " PTR_FORMAT ", narrow_oop_shift = %d",
1645 narrow_oop_mode(), p2i(narrow_oop_base()), narrow_oop_shift());
1646 }
1647 aot_log_info(aot)("The current max heap size = %zuM, G1HeapRegion::GrainBytes = %zu",
1648 MaxHeapSize/M, G1HeapRegion::GrainBytes);
1649 aot_log_info(aot)(" narrow_klass_base = " PTR_FORMAT ", arrow_klass_pointer_bits = %d, narrow_klass_shift = %d",
1650 p2i(CompressedKlassPointers::base()), CompressedKlassPointers::narrow_klass_pointer_bits(), CompressedKlassPointers::shift());
1651 if (UseCompressedOops) {
1652 aot_log_info(aot)(" narrow_oop_mode = %d, narrow_oop_base = " PTR_FORMAT ", narrow_oop_shift = %d",
1653 CompressedOops::mode(), p2i(CompressedOops::base()), CompressedOops::shift());
1654 }
1655 if (!object_streaming_mode()) {
1656 aot_log_info(aot)(" heap range = [" PTR_FORMAT " - " PTR_FORMAT "]",
1657 UseCompressedOops ? p2i(CompressedOops::begin()) :
1658 UseG1GC ? p2i((address)G1CollectedHeap::heap()->reserved().start()) : 0L,
1659 UseCompressedOops ? p2i(CompressedOops::end()) :
1660 UseG1GC ? p2i((address)G1CollectedHeap::heap()->reserved().end()) : 0L);
1661 }
1662
1663 int err = 0;
1664 if ( archive_narrow_klass_base != CompressedKlassPointers::base() ||
1665 (err = 1, archive_narrow_klass_pointer_bits != CompressedKlassPointers::narrow_klass_pointer_bits()) ||
1666 (err = 2, archive_narrow_klass_shift != CompressedKlassPointers::shift()) ) {
1667 stringStream ss;
1668 switch (err) {
1669 case 0:
1670 ss.print("Unexpected encoding base encountered (" PTR_FORMAT ", expected " PTR_FORMAT ")",
1671 p2i(CompressedKlassPointers::base()), p2i(archive_narrow_klass_base));
1672 break;
1673 case 1:
1674 ss.print("Unexpected narrow Klass bit length encountered (%d, expected %d)",
1675 CompressedKlassPointers::narrow_klass_pointer_bits(), archive_narrow_klass_pointer_bits);
1676 break;
1677 case 2:
1678 ss.print("Unexpected narrow Klass shift encountered (%d, expected %d)",
1679 CompressedKlassPointers::shift(), archive_narrow_klass_shift);
1680 break;
1681 default:
1682 ShouldNotReachHere();
1683 };
1684 if (CDSConfig::new_aot_flags_used()) {
1685 LogTarget(Info, aot) lt;
1686 if (lt.is_enabled()) {
1687 LogStream ls(lt);
1688 ls.print_raw(ss.base());
1689 header()->print(&ls);
1690 }
1691 } else {
1692 LogTarget(Info, cds) lt;
1693 if (lt.is_enabled()) {
1694 LogStream ls(lt);
1695 ls.print_raw(ss.base());
1696 header()->print(&ls);
1697 }
1698 }
1699 assert(false, "%s", ss.base());
1700 }
1701
1702 return true;
1703 }
1704
1705 #endif // INCLUDE_CDS_JAVA_HEAP
1706
1707 // Unmap a memory region in the address space.
1708
1709 void FileMapInfo::unmap_regions(int regions[], int num_regions) {
1710 for (int r = 0; r < num_regions; r++) {
1711 int idx = regions[r];
1712 unmap_region(idx);
1713 }
1714 }
1715
1716 void FileMapInfo::unmap_region(int i) {
1717 FileMapRegion* r = region_at(i);
1718 char* mapped_base = r->mapped_base();
1719 size_t size = r->used_aligned();
1720
1721 if (mapped_base != nullptr) {
1722 if (size > 0 && r->mapped_from_file()) {
1723 aot_log_info(aot)("Unmapping region #%d at base " INTPTR_FORMAT " (%s)", i, p2i(mapped_base),
1724 shared_region_name[i]);
1725 if (r->in_reserved_space()) {
1726 // This region was mapped inside a ReservedSpace. Its memory will be freed when the ReservedSpace
1727 // is released. Zero it so that we don't accidentally read its content.
1728 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]);
1729 } else {
1730 if (!os::unmap_memory(mapped_base, size)) {
1731 fatal("os::unmap_memory failed");
1732 }
1733 }
1734 }
1735 r->set_mapped_base(nullptr);
1736 }
1737 }
1738
1739 void FileMapInfo::assert_mark(bool check) {
1740 if (!check) {
1741 AOTMetaspace::unrecoverable_loading_error("Mark mismatch while restoring from shared file.");
1742 }
1743 }
1744
1745 FileMapInfo* FileMapInfo::_current_info = nullptr;
1746 FileMapInfo* FileMapInfo::_dynamic_archive_info = nullptr;
1747 bool FileMapInfo::_memory_mapping_failed = false;
1748
1749 // Open the shared archive file, read and validate the header
1750 // information (version, boot classpath, etc.). If initialization
1751 // fails, shared spaces are disabled and the file is closed.
1752 //
1753 // Validation of the archive is done in two steps:
1754 //
1755 // [1] validate_header() - done here.
1756 // [2] validate_shared_path_table - this is done later, because the table is in the RO
1757 // region of the archive, which is not mapped yet.
1758 bool FileMapInfo::open_as_input() {
1759 assert(CDSConfig::is_using_archive(), "UseSharedSpaces expected.");
1760 assert(Arguments::has_jimage(), "The shared archive file cannot be used with an exploded module build.");
1761
1762 if (JvmtiExport::should_post_class_file_load_hook() && JvmtiExport::has_early_class_hook_env()) {
1763 // CDS assumes that no classes resolved in vmClasses::resolve_all()
1764 // are replaced at runtime by JVMTI ClassFileLoadHook. All of those classes are resolved
1765 // during the JVMTI "early" stage, so we can still use CDS if
1766 // JvmtiExport::has_early_class_hook_env() is false.
1767 AOTMetaspace::report_loading_error("CDS is disabled because early JVMTI ClassFileLoadHook is in use.");
1768 return false;
1769 }
1770
1771 if (!open_for_read() || !init_from_file(_fd) || !validate_header()) {
1772 if (_is_static) {
1773 AOTMetaspace::report_loading_error("Loading static archive failed.");
1774 return false;
1775 } else {
1776 AOTMetaspace::report_loading_error("Loading dynamic archive failed.");
1777 if (AutoCreateSharedArchive) {
1778 CDSConfig::enable_dumping_dynamic_archive(_full_path);
1779 }
1780 return false;
1781 }
1782 }
1783
1784 return true;
1785 }
1786
1787 bool FileMapInfo::validate_aot_class_linking() {
1788 // These checks need to be done after FileMapInfo::initialize(), which gets called before Universe::heap()
1789 // is available.
1790 if (header()->has_aot_linked_classes()) {
1791 const char* archive_type = CDSConfig::type_of_archive_being_loaded();
1792 CDSConfig::set_has_aot_linked_classes(true);
1793 if (JvmtiExport::should_post_class_file_load_hook()) {
1794 aot_log_error(aot)("%s has aot-linked classes. It cannot be used when JVMTI ClassFileLoadHook is in use.",
1795 archive_type);
1796 return false;
1797 }
1798 if (JvmtiExport::has_early_vmstart_env()) {
1799 aot_log_error(aot)("%s has aot-linked classes. It cannot be used when JVMTI early vm start is in use.",
1800 archive_type);
1801 return false;
1802 }
1803 if (!CDSConfig::is_using_full_module_graph()) {
1804 aot_log_error(aot)("%s has aot-linked classes. It cannot be used when archived full module graph is not used.",
1805 archive_type);
1806 return false;
1807 }
1808
1809 const char* prop = Arguments::get_property("java.security.manager");
1810 if (prop != nullptr && strcmp(prop, "disallow") != 0) {
1811 aot_log_error(aot)("%s has aot-linked classes. It cannot be used with -Djava.security.manager=%s.",
1812 archive_type, prop);
1813 return false;
1814 }
1815
1816 #if INCLUDE_JVMTI
1817 if (Arguments::has_jdwp_agent()) {
1818 aot_log_error(aot)("%s has aot-linked classes. It cannot be used with JDWP agent", archive_type);
1819 return false;
1820 }
1821 #endif
1822 }
1823
1824 return true;
1825 }
1826
1827 // The 2 core spaces are RW->RO
1828 FileMapRegion* FileMapInfo::first_core_region() const {
1829 return region_at(AOTMetaspace::rw);
1830 }
1831
1832 FileMapRegion* FileMapInfo::last_core_region() const {
1833 return region_at(AOTMetaspace::ro);
1834 }
1835
1836 void FileMapInfo::print(outputStream* st) const {
1837 header()->print(st);
1838 if (!is_static()) {
1839 dynamic_header()->print(st);
1840 }
1841 }
1842
1843 void FileMapHeader::set_as_offset(char* p, size_t *offset) {
1844 *offset = ArchiveBuilder::current()->any_to_offset((address)p);
1845 }
1846
1847 int FileMapHeader::compute_crc() {
1848 char* start = (char*)this;
1849 // start computing from the field after _header_size to end of base archive name.
1850 char* buf = (char*)&(_generic_header._header_size) + sizeof(_generic_header._header_size);
1851 size_t sz = header_size() - (buf - start);
1852 int crc = ClassLoader::crc32(0, buf, (jint)sz);
1853 return crc;
1854 }
1855
1856 // This function should only be called during run time with UseSharedSpaces enabled.
1857 bool FileMapHeader::validate() {
1858 const char* file_type = CDSConfig::type_of_archive_being_loaded();
1859 if (_obj_alignment != ObjectAlignmentInBytes) {
1860 AOTMetaspace::report_loading_error("The %s's ObjectAlignmentInBytes of %d"
1861 " does not equal the current ObjectAlignmentInBytes of %d.",
1862 file_type, _obj_alignment, ObjectAlignmentInBytes);
1863 return false;
1864 }
1865 if (_compact_strings != CompactStrings) {
1866 AOTMetaspace::report_loading_error("The %s's CompactStrings setting (%s)"
1867 " does not equal the current CompactStrings setting (%s).", file_type,
1868 _compact_strings ? "enabled" : "disabled",
1869 CompactStrings ? "enabled" : "disabled");
1870 return false;
1871 }
1872 bool jvmci_compiler_is_enabled = CompilerConfig::is_jvmci_compiler_enabled();
1873 CompilerType compiler_type = CompilerConfig::compiler_type();
1874 CompilerType archive_compiler_type = CompilerType(_compiler_type);
1875 // JVMCI compiler does different type profiling settigns and generate
1876 // different code. We can't use archive which was produced
1877 // without it and reverse.
1878 // Only allow mix when JIT compilation is disabled.
1879 // Interpreter is used by default when dumping archive.
1880 bool intepreter_is_used = (archive_compiler_type == CompilerType::compiler_none) ||
1881 (compiler_type == CompilerType::compiler_none);
1882 if (!intepreter_is_used &&
1883 jvmci_compiler_is_enabled != (archive_compiler_type == CompilerType::compiler_jvmci)) {
1884 AOTMetaspace::report_loading_error("The %s's JIT compiler setting (%s)"
1885 " does not equal the current setting (%s).", file_type,
1886 compilertype2name(archive_compiler_type), compilertype2name(compiler_type));
1887 return false;
1888 }
1889 if (TrainingData::have_data()) {
1890 if (_type_profile_level != TypeProfileLevel) {
1891 AOTMetaspace::report_loading_error("The %s's TypeProfileLevel setting (%d)"
1892 " does not equal the current TypeProfileLevel setting (%d).", file_type,
1893 _type_profile_level, TypeProfileLevel);
1894 return false;
1895 }
1896 if (_type_profile_args_limit != TypeProfileArgsLimit) {
1897 AOTMetaspace::report_loading_error("The %s's TypeProfileArgsLimit setting (%d)"
1898 " does not equal the current TypeProfileArgsLimit setting (%d).", file_type,
1899 _type_profile_args_limit, TypeProfileArgsLimit);
1900 return false;
1901 }
1902 if (_type_profile_parms_limit != TypeProfileParmsLimit) {
1903 AOTMetaspace::report_loading_error("The %s's TypeProfileParamsLimit setting (%d)"
1904 " does not equal the current TypeProfileParamsLimit setting (%d).", file_type,
1905 _type_profile_args_limit, TypeProfileArgsLimit);
1906 return false;
1907
1908 }
1909 if (_type_profile_width != TypeProfileWidth) {
1910 AOTMetaspace::report_loading_error("The %s's TypeProfileWidth setting (%d)"
1911 " does not equal the current TypeProfileWidth setting (%d).", file_type,
1912 (int)_type_profile_width, (int)TypeProfileWidth);
1913 return false;
1914
1915 }
1916 if (_bci_profile_width != BciProfileWidth) {
1917 AOTMetaspace::report_loading_error("The %s's BciProfileWidth setting (%d)"
1918 " does not equal the current BciProfileWidth setting (%d).", file_type,
1919 (int)_bci_profile_width, (int)BciProfileWidth);
1920 return false;
1921 }
1922 if (_type_profile_casts != TypeProfileCasts) {
1923 AOTMetaspace::report_loading_error("The %s's TypeProfileCasts setting (%s)"
1924 " does not equal the current TypeProfileCasts setting (%s).", file_type,
1925 _type_profile_casts ? "enabled" : "disabled",
1926 TypeProfileCasts ? "enabled" : "disabled");
1927
1928 return false;
1929
1930 }
1931 if (_profile_traps != ProfileTraps) {
1932 AOTMetaspace::report_loading_error("The %s's ProfileTraps setting (%s)"
1933 " does not equal the current ProfileTraps setting (%s).", file_type,
1934 _profile_traps ? "enabled" : "disabled",
1935 ProfileTraps ? "enabled" : "disabled");
1936
1937 return false;
1938 }
1939 if (_spec_trap_limit_extra_entries != SpecTrapLimitExtraEntries) {
1940 AOTMetaspace::report_loading_error("The %s's SpecTrapLimitExtraEntries setting (%d)"
1941 " does not equal the current SpecTrapLimitExtraEntries setting (%d).", file_type,
1942 _spec_trap_limit_extra_entries, SpecTrapLimitExtraEntries);
1943 return false;
1944
1945 }
1946 }
1947
1948 // This must be done after header validation because it might change the
1949 // header data
1950 const char* prop = Arguments::get_property("java.system.class.loader");
1951 if (prop != nullptr) {
1952 if (has_aot_linked_classes()) {
1953 AOTMetaspace::report_loading_error("%s has aot-linked classes. It cannot be used when the "
1954 "java.system.class.loader property is specified.",
1955 CDSConfig::type_of_archive_being_loaded());
1956 return false;
1957 }
1958 aot_log_warning(aot)("Archived non-system classes are disabled because the "
1959 "java.system.class.loader property is specified (value = \"%s\"). "
1960 "To use archived non-system classes, this property must not be set", prop);
1961 _has_platform_or_app_classes = false;
1962 }
1963
1964
1965 if (!_verify_local && BytecodeVerificationLocal) {
1966 // we cannot load boot classes, so there's no point of using the CDS archive
1967 AOTMetaspace::report_loading_error("The %s's BytecodeVerificationLocal setting (%s)"
1968 " does not equal the current BytecodeVerificationLocal setting (%s).", file_type,
1969 _verify_local ? "enabled" : "disabled",
1970 BytecodeVerificationLocal ? "enabled" : "disabled");
1971 return false;
1972 }
1973
1974 // For backwards compatibility, we don't check the BytecodeVerificationRemote setting
1975 // if the archive only contains system classes.
1976 if (_has_platform_or_app_classes
1977 && !_verify_remote // we didn't verify the archived platform/app classes
1978 && BytecodeVerificationRemote) { // but we want to verify all loaded platform/app classes
1979 aot_log_info(aot)("The %s was created with less restrictive "
1980 "verification setting than the current setting.", file_type);
1981 // Pretend that we didn't have any archived platform/app classes, so they won't be loaded
1982 // by SystemDictionaryShared.
1983 _has_platform_or_app_classes = false;
1984 }
1985
1986 aot_log_info(aot)("The %s was created with UseCompressedOops = %d, UseCompressedClassPointers = %d, UseCompactObjectHeaders = %d",
1987 file_type, compressed_oops(), compressed_class_pointers(), compact_headers());
1988 if (compressed_oops() != UseCompressedOops || compressed_class_pointers() != UseCompressedClassPointers) {
1989 aot_log_warning(aot)("Unable to use %s.\nThe saved state of UseCompressedOops and UseCompressedClassPointers is "
1990 "different from runtime, CDS will be disabled.", file_type);
1991 return false;
1992 }
1993
1994 if (is_static()) {
1995 const char* err = nullptr;
1996 if (Arguments::is_valhalla_enabled()) {
1997 if (!_has_valhalla_patched_classes) {
1998 err = "not created";
1999 }
2000 } else {
2001 if (_has_valhalla_patched_classes) {
2002 err = "created";
2003 }
2004 }
2005 if (err != nullptr) {
2006 log_warning(cds)("This archive was %s with --enable-preview. It is "
2007 "incompatible with the current JVM setting", err);
2008 return false;
2009 }
2010 }
2011
2012 if (compact_headers() != UseCompactObjectHeaders) {
2013 aot_log_warning(aot)("Unable to use %s.\nThe %s's UseCompactObjectHeaders setting (%s)"
2014 " does not equal the current UseCompactObjectHeaders setting (%s).", file_type, file_type,
2015 _compact_headers ? "enabled" : "disabled",
2016 UseCompactObjectHeaders ? "enabled" : "disabled");
2017 return false;
2018 }
2019
2020 if (!_use_optimized_module_handling && !CDSConfig::is_dumping_final_static_archive()) {
2021 CDSConfig::stop_using_optimized_module_handling();
2022 aot_log_info(aot)("optimized module handling: disabled because archive was created without optimized module handling");
2023 }
2024
2025 if (is_static()) {
2026 // Only the static archive can contain the full module graph.
2027 if (!_has_full_module_graph) {
2028 CDSConfig::stop_using_full_module_graph("archive was created without full module graph");
2029 }
2030 }
2031
2032 return true;
2033 }
2034
2035 bool FileMapInfo::validate_header() {
2036 if (!header()->validate()) {
2037 return false;
2038 }
2039 if (_is_static) {
2040 return true;
2041 } else {
2042 return DynamicArchive::validate(this);
2043 }
2044 }
2045
2046 #if INCLUDE_JVMTI
2047 ClassPathEntry** FileMapInfo::_classpath_entries_for_jvmti = nullptr;
2048
2049 ClassPathEntry* FileMapInfo::get_classpath_entry_for_jvmti(int i, TRAPS) {
2050 if (i == 0) {
2051 // index 0 corresponds to the ClassPathImageEntry which is a globally shared object
2052 // and should never be deleted.
2053 return ClassLoader::get_jrt_entry();
2054 }
2055 ClassPathEntry* ent = _classpath_entries_for_jvmti[i];
2056 if (ent == nullptr) {
2057 const AOTClassLocation* cl = AOTClassLocationConfig::runtime()->class_location_at(i);
2058 const char* path = cl->path();
2059 struct stat st;
2060 if (os::stat(path, &st) != 0) {
2061 char *msg = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(path) + 128);
2062 jio_snprintf(msg, strlen(path) + 127, "error in finding JAR file %s", path);
2063 THROW_MSG_(vmSymbols::java_io_IOException(), msg, nullptr);
2064 } else {
2065 ent = ClassLoader::create_class_path_entry(THREAD, path, &st);
2066 if (ent == nullptr) {
2067 char *msg = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(path) + 128);
2068 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
2069 THROW_MSG_(vmSymbols::java_io_IOException(), msg, nullptr);
2070 }
2071 }
2072
2073 MutexLocker mu(THREAD, CDSClassFileStream_lock);
2074 if (_classpath_entries_for_jvmti[i] == nullptr) {
2075 _classpath_entries_for_jvmti[i] = ent;
2076 } else {
2077 // Another thread has beat me to creating this entry
2078 delete ent;
2079 ent = _classpath_entries_for_jvmti[i];
2080 }
2081 }
2082
2083 return ent;
2084 }
2085
2086 ClassFileStream* FileMapInfo::open_stream_for_jvmti(InstanceKlass* ik, Handle class_loader, TRAPS) {
2087 int path_index = ik->shared_classpath_index();
2088 assert(path_index >= 0, "should be called for shared built-in classes only");
2089 assert(path_index < AOTClassLocationConfig::runtime()->length(), "sanity");
2090
2091 ClassPathEntry* cpe = get_classpath_entry_for_jvmti(path_index, CHECK_NULL);
2092 assert(cpe != nullptr, "must be");
2093
2094 Symbol* name = ik->name();
2095 const char* const class_name = name->as_C_string();
2096 const char* const file_name = ClassLoader::file_name_for_class_name(class_name,
2097 name->utf8_length());
2098 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader());
2099 const AOTClassLocation* cl = AOTClassLocationConfig::runtime()->class_location_at(path_index);
2100 ClassFileStream* cfs;
2101 if (class_loader() != nullptr && cl->is_multi_release_jar()) {
2102 // This class was loaded from a multi-release JAR file during dump time. The
2103 // process for finding its classfile is complex. Let's defer to the Java code
2104 // in java.lang.ClassLoader.
2105 cfs = get_stream_from_class_loader(class_loader, cpe, file_name, CHECK_NULL);
2106 } else {
2107 cfs = cpe->open_stream_for_loader(THREAD, file_name, loader_data);
2108 }
2109 assert(cfs != nullptr, "must be able to read the classfile data of shared classes for built-in loaders.");
2110 log_debug(aot, jvmti)("classfile data for %s [%d: %s] = %d bytes", class_name, path_index,
2111 cfs->source(), cfs->length());
2112 return cfs;
2113 }
2114
2115 ClassFileStream* FileMapInfo::get_stream_from_class_loader(Handle class_loader,
2116 ClassPathEntry* cpe,
2117 const char* file_name,
2118 TRAPS) {
2119 JavaValue result(T_OBJECT);
2120 oop class_name = java_lang_String::create_oop_from_str(file_name, THREAD);
2121 Handle h_class_name = Handle(THREAD, class_name);
2122
2123 // byte[] ClassLoader.getResourceAsByteArray(String name)
2124 JavaCalls::call_virtual(&result,
2125 class_loader,
2126 vmClasses::ClassLoader_klass(),
2127 vmSymbols::getResourceAsByteArray_name(),
2128 vmSymbols::getResourceAsByteArray_signature(),
2129 h_class_name,
2130 CHECK_NULL);
2131 assert(result.get_type() == T_OBJECT, "just checking");
2132 oop obj = result.get_oop();
2133 assert(obj != nullptr, "ClassLoader.getResourceAsByteArray should not return null");
2134
2135 // copy from byte[] to a buffer
2136 typeArrayOop ba = typeArrayOop(obj);
2137 jint len = ba->length();
2138 u1* buffer = NEW_RESOURCE_ARRAY(u1, len);
2139 ArrayAccess<>::arraycopy_to_native<>(ba, typeArrayOopDesc::element_offset<jbyte>(0), buffer, len);
2140
2141 return new ClassFileStream(buffer, len, cpe->name());
2142 }
2143 #endif