1 /*
2 * Copyright (c) 2023, 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 "precompiled.hpp"
26 #include "cds/archiveHeapLoader.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/cds_globals.hpp"
29 #include "cds/classListWriter.hpp"
30 #include "cds/heapShared.hpp"
31 #include "cds/metaspaceShared.hpp"
32 #include "classfile/classLoaderDataShared.hpp"
33 #include "classfile/moduleEntry.hpp"
34 #include "classfile/systemDictionaryShared.hpp"
35 #include "include/jvm_io.h"
36 #include "logging/log.hpp"
37 #include "prims/jvmtiExport.hpp"
38 #include "memory/universe.hpp"
39 #include "runtime/arguments.hpp"
40 #include "runtime/globals_extension.hpp"
41 #include "runtime/java.hpp"
42 #include "runtime/vmThread.hpp"
43 #include "utilities/defaultStream.hpp"
44 #include "utilities/formatBuffer.hpp"
45
46 bool CDSConfig::_is_dumping_static_archive = false;
47 bool CDSConfig::_is_dumping_dynamic_archive = false;
48 bool CDSConfig::_is_using_optimized_module_handling = true;
49 bool CDSConfig::_is_dumping_full_module_graph = true;
50 bool CDSConfig::_is_using_full_module_graph = true;
51 bool CDSConfig::_has_aot_linked_classes = false;
52 bool CDSConfig::_has_archived_invokedynamic = false;
53 bool CDSConfig::_is_loading_packages = false;
54 bool CDSConfig::_is_loading_protection_domains = false;
55 bool CDSConfig::_is_security_manager_allowed = false;
56 bool CDSConfig::_old_cds_flags_used = false;
57
58 char* CDSConfig::_default_archive_path = nullptr;
59 char* CDSConfig::_static_archive_path = nullptr;
60 char* CDSConfig::_dynamic_archive_path = nullptr;
61
62 JavaThread* CDSConfig::_dumper_thread = nullptr;
63
64 int CDSConfig::get_status() {
65 assert(Universe::is_fully_initialized(), "status is finalized only after Universe is initialized");
66 return (is_dumping_archive() ? IS_DUMPING_ARCHIVE : 0) |
67 (is_dumping_static_archive() ? IS_DUMPING_STATIC_ARCHIVE : 0) |
68 (is_logging_lambda_form_invokers() ? IS_LOGGING_LAMBDA_FORM_INVOKERS : 0) |
69 (is_using_archive() ? IS_USING_ARCHIVE : 0) |
70 (is_dumping_heap() ? IS_DUMPING_HEAP : 0) |
71 (is_logging_dynamic_proxies() ? IS_LOGGING_DYNAMIC_PROXIES : 0) |
72 (is_dumping_packages() ? IS_DUMPING_PACKAGES : 0) |
73 (is_dumping_protection_domains() ? IS_DUMPING_PROTECTION_DOMAINS : 0);
74 }
75
76 void CDSConfig::initialize() {
77 if (is_dumping_static_archive() && !is_dumping_final_static_archive()) {
78 UseSharedSpaces = false;
79 }
80
81 // Initialize shared archive paths which could include both base and dynamic archive paths
82 // This must be after set_ergonomics_flags() called so flag UseCompressedOops is set properly.
83 //
84 // UseSharedSpaces may be disabled if -XX:SharedArchiveFile is invalid.
85 if (is_dumping_static_archive() || is_using_archive()) {
86 init_shared_archive_paths();
87 }
88
89 if (!is_dumping_heap()) {
90 _is_dumping_full_module_graph = false;
91 }
92 }
93
94 char* CDSConfig::default_archive_path() {
95 if (_default_archive_path == nullptr) {
96 char jvm_path[JVM_MAXPATHLEN];
97 os::jvm_path(jvm_path, sizeof(jvm_path));
98 char *end = strrchr(jvm_path, *os::file_separator());
99 if (end != nullptr) *end = '\0';
100 stringStream tmp;
101 tmp.print("%s%sclasses", jvm_path, os::file_separator());
102 #ifdef _LP64
103 if (!UseCompressedOops) {
104 tmp.print_raw("_nocoops");
105 }
106 if (UseCompactObjectHeaders) {
107 // Note that generation of xxx_coh.jsa variants require
108 // --enable-cds-archive-coh at build time
109 tmp.print_raw("_coh");
110 }
111 #endif
112 tmp.print_raw(".jsa");
113 _default_archive_path = os::strdup(tmp.base());
114 }
115 return _default_archive_path;
116 }
117
118 int CDSConfig::num_archives(const char* archive_path) {
119 if (archive_path == nullptr) {
120 return 0;
121 }
122 int npaths = 1;
123 char* p = (char*)archive_path;
124 while (*p != '\0') {
125 if (*p == os::path_separator()[0]) {
126 npaths++;
127 }
128 p++;
129 }
130 return npaths;
131 }
132
133 void CDSConfig::extract_shared_archive_paths(const char* archive_path,
134 char** base_archive_path,
135 char** top_archive_path) {
136 char* begin_ptr = (char*)archive_path;
137 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
138 if (end_ptr == nullptr || end_ptr == begin_ptr) {
139 vm_exit_during_initialization("Base archive was not specified", archive_path);
140 }
141 size_t len = end_ptr - begin_ptr;
142 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
143 strncpy(cur_path, begin_ptr, len);
144 cur_path[len] = '\0';
145 *base_archive_path = cur_path;
146
147 begin_ptr = ++end_ptr;
148 if (*begin_ptr == '\0') {
149 vm_exit_during_initialization("Top archive was not specified", archive_path);
150 }
151 end_ptr = strchr(begin_ptr, '\0');
152 assert(end_ptr != nullptr, "sanity");
153 len = end_ptr - begin_ptr;
154 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
155 strncpy(cur_path, begin_ptr, len + 1);
156 *top_archive_path = cur_path;
157 }
158
159 static void set_new_workflow_default_CachedCodeFile() {
160 size_t len = strlen(CacheDataStore) + 6;
161 char* file = AllocateHeap(len, mtArguments);
162 jio_snprintf(file, len, "%s.code", CacheDataStore);
163 FLAG_SET_ERGO(CachedCodeFile, file);
164 }
165
166 void CDSConfig::init_shared_archive_paths() {
167 if (ArchiveClassesAtExit != nullptr) {
168 assert(!RecordDynamicDumpInfo, "already checked");
169 if (is_dumping_static_archive()) {
170 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
171 }
172 check_unsupported_dumping_module_options();
173
174 if (os::same_files(default_archive_path(), ArchiveClassesAtExit)) {
175 vm_exit_during_initialization(
176 "Cannot specify the default CDS archive for -XX:ArchiveClassesAtExit", default_archive_path());
177 }
178 }
179
180 if (SharedArchiveFile == nullptr) {
181 _static_archive_path = default_archive_path();
182 } else {
183 int archives = num_archives(SharedArchiveFile);
184 assert(archives > 0, "must be");
185
186 if (is_dumping_archive() && archives > 1) {
187 vm_exit_during_initialization(
188 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
189 }
190
191 if (CDSPreimage != nullptr && archives > 1) {
192 vm_exit_during_initialization("CDSPreimage must point to a single file", CDSPreimage);
193 }
194
195 if (is_dumping_static_archive()) {
196 assert(archives == 1, "must be");
197 // Static dump is simple: only one archive is allowed in SharedArchiveFile. This file
198 // will be overwritten no matter regardless of its contents
199 _static_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
200 } else {
201 // SharedArchiveFile may specify one or two files. In case (c), the path for base.jsa
202 // is read from top.jsa
203 // (a) 1 file: -XX:SharedArchiveFile=base.jsa
204 // (b) 2 files: -XX:SharedArchiveFile=base.jsa:top.jsa
205 // (c) 2 files: -XX:SharedArchiveFile=top.jsa
206 //
207 // However, if either RecordDynamicDumpInfo or ArchiveClassesAtExit is used, we do not
208 // allow cases (b) and (c). Case (b) is already checked above.
209
210 if (archives > 2) {
211 vm_exit_during_initialization(
212 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
213 }
214 if (archives == 1) {
215 char* base_archive_path = nullptr;
216 bool success =
217 FileMapInfo::get_base_archive_name_from_header(SharedArchiveFile, &base_archive_path);
218 if (!success) {
219 if (CDSPreimage != nullptr) {
220 vm_exit_during_initialization("Unable to map shared spaces from CDSPreimage", CDSPreimage);
221 }
222
223 // If +AutoCreateSharedArchive and the specified shared archive does not exist,
224 // regenerate the dynamic archive base on default archive.
225 if (AutoCreateSharedArchive && !os::file_exists(SharedArchiveFile)) {
226 enable_dumping_dynamic_archive();
227 ArchiveClassesAtExit = const_cast<char *>(SharedArchiveFile);
228 _static_archive_path = default_archive_path();
229 SharedArchiveFile = nullptr;
230 } else {
231 if (AutoCreateSharedArchive) {
232 warning("-XX:+AutoCreateSharedArchive is unsupported when base CDS archive is not loaded. Run with -Xlog:cds for more info.");
233 AutoCreateSharedArchive = false;
234 }
235 Arguments::no_shared_spaces("invalid archive");
236 }
237 } else if (base_archive_path == nullptr) {
238 // User has specified a single archive, which is a static archive.
239 _static_archive_path = const_cast<char *>(SharedArchiveFile);
240 } else {
241 // User has specified a single archive, which is a dynamic archive.
242 _dynamic_archive_path = const_cast<char *>(SharedArchiveFile);
243 _static_archive_path = base_archive_path; // has been c-heap allocated.
244 }
245 } else {
246 extract_shared_archive_paths((const char*)SharedArchiveFile,
247 &_static_archive_path, &_dynamic_archive_path);
248 if (_static_archive_path == nullptr) {
249 assert(_dynamic_archive_path == nullptr, "must be");
250 Arguments::no_shared_spaces("invalid archive");
251 }
252 }
253
254 if (_dynamic_archive_path != nullptr) {
255 // Check for case (c)
256 if (RecordDynamicDumpInfo) {
257 vm_exit_during_initialization("-XX:+RecordDynamicDumpInfo is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile",
258 SharedArchiveFile);
259 }
260 if (ArchiveClassesAtExit != nullptr) {
261 vm_exit_during_initialization("-XX:ArchiveClassesAtExit is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile",
262 SharedArchiveFile);
263 }
264 }
265
266 if (ArchiveClassesAtExit != nullptr && os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
267 vm_exit_during_initialization(
268 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
269 SharedArchiveFile);
270 }
271 }
272 }
273 }
274
275 static char* bad_module_prop_key = nullptr;
276 static char* bad_module_prop_value = nullptr;
277
278 void CDSConfig::check_internal_module_property(const char* key, const char* value) {
279 if (Arguments::is_internal_module_property(key) &&
280 !Arguments::is_module_path_property(key) &&
281 !Arguments::is_add_modules_property(key)) {
282 stop_using_optimized_module_handling();
283 if (bad_module_prop_key == nullptr) {
284 // We don't want to print an unconditional warning here, as we are still processing the command line.
285 // A later argument may specify something like -Xshare:off, which makes such a warning irrelevant.
286 //
287 // Instead, we save the info so we can warn when necessary: we are doing it only during CacheDataStore
288 // creation for now, but could add it to other places.
289 bad_module_prop_key = os::strdup(key);
290 bad_module_prop_value = os::strdup(value);
291 }
292 log_info(cds)("optimized module handling/full module graph: disabled due to incompatible property: %s=%s", key, value);
293 }
294 }
295
296 void CDSConfig::check_incompatible_property(const char* key, const char* value) {
297 static const char* incompatible_properties[] = {
298 "java.system.class.loader",
299 "jdk.module.showModuleResolution",
300 "jdk.module.validation"
301 };
302
303 for (const char* property : incompatible_properties) {
304 if (strcmp(key, property) == 0) {
305 stop_dumping_full_module_graph();
306 stop_using_full_module_graph();
307 log_info(cds)("full module graph: disabled due to incompatible property: %s=%s", key, value);
308 break;
309 }
310 }
311
312 // Match the logic in java/lang/System.java, but we need to know this before the System class is initialized.
313 if (strcmp(key, "java.security.manager") == 0) {
314 if (strcmp(value, "disallowed") != 0) {
315 _is_security_manager_allowed = true;
316 }
317 }
318 }
319
320 // Returns any JVM command-line option, such as "--patch-module", that's not supported by CDS.
321 static const char* find_any_unsupported_module_option() {
322 // Note that arguments.cpp has translated the command-line options into properties. If we find an
323 // unsupported property, translate it back to its command-line option for better error reporting.
324
325 // The following properties are checked by Arguments::is_internal_module_property() and cannot be
326 // directly specified in the command-line.
327 static const char* unsupported_module_properties[] = {
328 "jdk.module.limitmods",
329 "jdk.module.upgrade.path",
330 "jdk.module.patch.0"
331 };
332 static const char* unsupported_module_options[] = {
333 "--limit-modules",
334 "--upgrade-module-path",
335 "--patch-module"
336 };
337
338 assert(ARRAY_SIZE(unsupported_module_properties) == ARRAY_SIZE(unsupported_module_options), "must be");
339 SystemProperty* sp = Arguments::system_properties();
340 while (sp != nullptr) {
341 for (uint i = 0; i < ARRAY_SIZE(unsupported_module_properties); i++) {
342 if (strcmp(sp->key(), unsupported_module_properties[i]) == 0) {
343 return unsupported_module_options[i];
344 }
345 }
346 sp = sp->next();
347 }
348
349 return nullptr; // not found
350 }
351
352 void CDSConfig::check_unsupported_dumping_module_options() {
353 assert(is_dumping_archive(), "this function is only used with CDS dump time");
354 const char* option = find_any_unsupported_module_option();
355 if (option != nullptr) {
356 vm_exit_during_initialization("Cannot use the following option when dumping the shared archive", option);
357 }
358 // Check for an exploded module build in use with -Xshare:dump.
359 if (!Arguments::has_jimage()) {
360 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
361 }
362 }
363
364 bool CDSConfig::has_unsupported_runtime_module_options() {
365 assert(is_using_archive(), "this function is only used with -Xshare:{on,auto}");
366 if (ArchiveClassesAtExit != nullptr) {
367 // dynamic dumping, just return false for now.
368 // check_unsupported_dumping_properties() will be called later to check the same set of
369 // properties, and will exit the VM with the correct error message if the unsupported properties
370 // are used.
371 return false;
372 }
373 const char* option = find_any_unsupported_module_option();
374 if (option != nullptr) {
375 if (RequireSharedSpaces) {
376 warning("CDS is disabled when the %s option is specified.", option);
377 } else {
378 log_info(cds)("CDS is disabled when the %s option is specified.", option);
379 }
380 return true;
381 }
382 return false;
383 }
384
385 #define CHECK_ALIAS(f) check_flag_alias(FLAG_IS_DEFAULT(f), #f)
386
387 void CDSConfig::check_flag_alias(bool alias_is_default, const char* alias_name) {
388 if (_old_cds_flags_used && !alias_is_default) {
389 vm_exit_during_initialization(err_msg("Option %s cannot be used at the same time with "
390 "-Xshare:on, -Xshare:auto, -Xshare:off, -Xshare:dump, "
391 "DumpLoadedClassList, SharedClassListFile, or SharedArchiveFile",
392 alias_name));
393 }
394 }
395
396 void CDSConfig::check_flag_aliases() {
397 if (!FLAG_IS_DEFAULT(DumpLoadedClassList) ||
398 !FLAG_IS_DEFAULT(SharedClassListFile) ||
399 !FLAG_IS_DEFAULT(SharedArchiveFile)) {
400 _old_cds_flags_used = true;
401 }
402
403 CHECK_ALIAS(AOTCache);
404 CHECK_ALIAS(AOTConfiguration);
405 CHECK_ALIAS(AOTMode);
406
407 if (FLAG_IS_DEFAULT(AOTCache) && FLAG_IS_DEFAULT(AOTConfiguration) && FLAG_IS_DEFAULT(AOTMode)) {
408 // Aliases not used.
409 return;
410 }
411
412 if (FLAG_IS_DEFAULT(AOTMode) || strcmp(AOTMode, "auto") == 0 || strcmp(AOTMode, "on") == 0) {
413 if (!FLAG_IS_DEFAULT(AOTConfiguration)) {
414 vm_exit_during_initialization("AOTConfiguration can only be used with -XX:AOTMode=record or -XX:AOTMode=create");
415 }
416
417 if (!FLAG_IS_DEFAULT(AOTCache)) {
418 assert(FLAG_IS_DEFAULT(SharedArchiveFile), "already checked");
419 FLAG_SET_ERGO(SharedArchiveFile, AOTCache);
420 }
421
422 UseSharedSpaces = true;
423 if (FLAG_IS_DEFAULT(AOTMode) || (strcmp(AOTMode, "auto") == 0)) {
424 RequireSharedSpaces = false;
425 } else {
426 assert(strcmp(AOTMode, "on") == 0, "already checked");
427 RequireSharedSpaces = true;
428 }
429 } else if (strcmp(AOTMode, "off") == 0) {
430 UseSharedSpaces = false;
431 RequireSharedSpaces = false;
432 } else {
433 // AOTMode is record or create
434 if (FLAG_IS_DEFAULT(AOTConfiguration)) {
435 vm_exit_during_initialization(err_msg("-XX:AOTMode=%s cannot be used without setting AOTConfiguration", AOTMode));
436 }
437
438 if (strcmp(AOTMode, "record") == 0) {
439 if (!FLAG_IS_DEFAULT(AOTCache)) {
440 vm_exit_during_initialization("AOTCache must not be specified when using -XX:AOTMode=record");
441 }
442
443 assert(FLAG_IS_DEFAULT(DumpLoadedClassList), "already checked");
444 FLAG_SET_ERGO(DumpLoadedClassList, AOTConfiguration);
445 UseSharedSpaces = false;
446 RequireSharedSpaces = false;
447 } else {
448 assert(strcmp(AOTMode, "create") == 0, "checked by AOTModeConstraintFunc");
449 if (FLAG_IS_DEFAULT(AOTCache)) {
450 vm_exit_during_initialization("AOTCache must be specified when using -XX:AOTMode=create");
451 }
452
453 assert(FLAG_IS_DEFAULT(SharedClassListFile), "already checked");
454 FLAG_SET_ERGO(SharedClassListFile, AOTConfiguration);
455 assert(FLAG_IS_DEFAULT(SharedArchiveFile), "already checked");
456 FLAG_SET_ERGO(SharedArchiveFile, AOTCache);
457
458 CDSConfig::enable_dumping_static_archive();
459 }
460 }
461 }
462
463 bool CDSConfig::check_vm_args_consistency(bool patch_mod_javabase, bool mode_flag_cmd_line, bool xshare_auto_cmd_line) {
464 check_flag_aliases();
465
466 if (CacheDataStore != nullptr) {
467 // Leyden temp work-around:
468 //
469 // By default, when using CacheDataStore, use the HeapBasedNarrowOop mode so that
470 // AOT code can be always work regardless of runtime heap range.
471 //
472 // If you are *absolutely sure* that the CompressedOops::mode() will be the same
473 // between training and production runs (e.g., if you specify -Xmx128m
474 // for both training and production runs, and you know the OS will always reserve
475 // the heap under 4GB), you can explicitly disable this with:
476 // java -XX:-UseCompatibleCompressedOops -XX:CacheDataStore=...
477 // However, this is risky and there's a chance that the production run will be slower
478 // because it is unable to load the AOT code cache.
479 #ifdef _LP64
480 FLAG_SET_ERGO_IF_DEFAULT(UseCompatibleCompressedOops, true);
481 #endif
482
483 // Leyden temp: make sure the user knows if CDS archive somehow fails to load.
484 if (UseSharedSpaces && !xshare_auto_cmd_line) {
485 log_info(cds)("Enabled -Xshare:on by default for troubleshooting Leyden prototype");
486 RequireSharedSpaces = true;
487 }
488
489 if (FLAG_IS_DEFAULT(AOTClassLinking)) {
490 // New workflow - enable AOTClassLinking by default.
491 // TODO: make new workflow work, even when AOTClassLinking is false.
492 //
493 // NOTE: in old workflow, we cannot enable AOTClassLinking by default. That
494 // should be an opt-in option, per JEP nnn.
495 FLAG_SET_ERGO(AOTClassLinking, true);
496 }
497
498 if (SharedArchiveFile != nullptr) {
499 vm_exit_during_initialization("CacheDataStore and SharedArchiveFile cannot be both specified");
500 }
501 if (!AOTClassLinking) {
502 // TODO: in the forked JVM, we should ensure all classes are loaded from the hotspot.cds.preimage.
503 // AOTClassLinking only loads the classes for built-in loaders. We need to load the classes
504 // for custom loaders as well.
505 vm_exit_during_initialization("CacheDataStore requires AOTClassLinking");
506 }
507
508 if (CDSPreimage == nullptr) {
509 if (os::file_exists(CacheDataStore) /* && TODO: CDS file is valid*/) {
510 // The CacheDataStore is already up to date. Use it. Also turn on cached code by default.
511 SharedArchiveFile = CacheDataStore;
512 FLAG_SET_ERGO_IF_DEFAULT(ReplayTraining, true);
513 FLAG_SET_ERGO_IF_DEFAULT(LoadCachedCode, true);
514 if (LoadCachedCode && FLAG_IS_DEFAULT(CachedCodeFile)) {
515 set_new_workflow_default_CachedCodeFile();
516 }
517 } else {
518 // The preimage dumping phase -- run the app and write the preimage file
519 size_t len = strlen(CacheDataStore) + 10;
520 char* preimage = AllocateHeap(len, mtArguments);
521 jio_snprintf(preimage, len, "%s.preimage", CacheDataStore);
522
523 UseSharedSpaces = false;
524 enable_dumping_static_archive();
525 SharedArchiveFile = preimage;
526 log_info(cds)("CacheDataStore needs to be updated. Writing %s file", SharedArchiveFile);
527
528 // At VM exit, the module graph may be contaminated with program states. We should rebuild the
529 // module graph when dumping the CDS final image.
530 log_info(cds)("full module graph: disabled when writing CDS preimage");
531 HeapShared::disable_writing();
532 stop_dumping_full_module_graph();
533 FLAG_SET_ERGO(ArchivePackages, false);
534 FLAG_SET_ERGO(ArchiveProtectionDomains, false);
535
536 FLAG_SET_ERGO_IF_DEFAULT(RecordTraining, true);
537 }
538 } else {
539 // The final image dumping phase -- load the preimage and write the final image file
540 SharedArchiveFile = CDSPreimage;
541 UseSharedSpaces = true;
542 log_info(cds)("Generate CacheDataStore %s from CDSPreimage %s", CacheDataStore, CDSPreimage);
543 // Force -Xbatch for AOT compilation.
544 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
545 return false;
546 }
547 RecordTraining = false; // This will be updated inside MetaspaceShared::preload_and_dump()
548
549 FLAG_SET_ERGO_IF_DEFAULT(ReplayTraining, true);
550 // Settings for AOT
551 FLAG_SET_ERGO_IF_DEFAULT(StoreCachedCode, true);
552 if (StoreCachedCode && FLAG_IS_DEFAULT(CachedCodeFile)) {
553 set_new_workflow_default_CachedCodeFile();
554 // Cannot dump cached code until metadata and heap are dumped.
555 disable_dumping_cached_code();
556 }
557 }
558 } else {
559 // Old workflow
560 if (CDSPreimage != nullptr) {
561 vm_exit_during_initialization("CDSPreimage must be specified only when CacheDataStore is specified");
562 }
563 }
564
565 if (FLAG_IS_DEFAULT(UsePermanentHeapObjects)) {
566 if (StoreCachedCode || AOTClassLinking) {
567 FLAG_SET_ERGO(UsePermanentHeapObjects, true);
568 }
569 }
570
571 if (LoadCachedCode) {
572 // This must be true. Cached code is hard-wired to use permanent objects.
573 UsePermanentHeapObjects = true;
574 }
575
576 if (AOTClassLinking) {
577 // If AOTClassLinking is specified, enable all these optimizations by default.
578 FLAG_SET_ERGO_IF_DEFAULT(AOTInvokeDynamicLinking, true);
579 FLAG_SET_ERGO_IF_DEFAULT(ArchiveDynamicProxies, true);
580 FLAG_SET_ERGO_IF_DEFAULT(ArchiveLoaderLookupCache, true);
581 FLAG_SET_ERGO_IF_DEFAULT(ArchivePackages, true);
582 FLAG_SET_ERGO_IF_DEFAULT(ArchiveProtectionDomains, true);
583 FLAG_SET_ERGO_IF_DEFAULT(ArchiveReflectionData, true);
584
585 FLAG_SET_ERGO(ArchiveDynamicProxies, false); // FIXME -- leyden+JEP483 merge
586 FLAG_SET_ERGO(ArchiveLoaderLookupCache, false); // FIXME -- leyden+JEP483 merge
587 FLAG_SET_ERGO(ArchiveReflectionData, false); // FIXME -- leyden+JEP483 merge
588 } else {
589 // All of these *might* depend on AOTClassLinking. Better be safe than sorry.
590 // TODO: more fine-grained handling.
591 FLAG_SET_ERGO(AOTInvokeDynamicLinking, false);
592 FLAG_SET_ERGO(ArchiveDynamicProxies, false);
593 FLAG_SET_ERGO(ArchiveLoaderLookupCache, false);
594 FLAG_SET_ERGO(ArchivePackages, false);
595 FLAG_SET_ERGO(ArchiveProtectionDomains, false);
596 FLAG_SET_ERGO(ArchiveReflectionData, false);
597 }
598
599 #ifdef _WINDOWS
600 // This optimization is not working on Windows for some reason. See JDK-8338604.
601 FLAG_SET_ERGO(ArchiveReflectionData, false);
602 #endif
603
604 if (is_dumping_static_archive()) {
605 if (is_dumping_preimage_static_archive() || is_dumping_final_static_archive()) {
606 // Don't tweak execution mode
607 } else if (!mode_flag_cmd_line) {
608 // By default, -Xshare:dump runs in interpreter-only mode, which is required for deterministic archive.
609 //
610 // If your classlist is large and you don't care about deterministic dumping, you can use
611 // -Xshare:dump -Xmixed to improve dumping speed.
612 Arguments::set_mode_flags(Arguments::_int);
613 } else if (Arguments::mode() == Arguments::_comp) {
614 // -Xcomp may use excessive CPU for the test tiers. Also, -Xshare:dump runs a small and fixed set of
615 // Java code, so there's not much benefit in running -Xcomp.
616 log_info(cds)("reduced -Xcomp to -Xmixed for static dumping");
617 Arguments::set_mode_flags(Arguments::_mixed);
618 }
619
620 // String deduplication may cause CDS to iterate the strings in different order from one
621 // run to another which resulting in non-determinstic CDS archives.
622 // Disable UseStringDeduplication while dumping CDS archive.
623 UseStringDeduplication = false;
624
625 // Don't use SoftReferences so that objects used by java.lang.invoke tables can be archived.
626 Arguments::PropertyList_add(new SystemProperty("java.lang.invoke.MethodHandleNatives.USE_SOFT_CACHE", "false", false));
627 }
628
629 // RecordDynamicDumpInfo is not compatible with ArchiveClassesAtExit
630 if (ArchiveClassesAtExit != nullptr && RecordDynamicDumpInfo) {
631 jio_fprintf(defaultStream::output_stream(),
632 "-XX:+RecordDynamicDumpInfo cannot be used with -XX:ArchiveClassesAtExit.\n");
633 return false;
634 }
635
636 if (ArchiveClassesAtExit == nullptr && !RecordDynamicDumpInfo) {
637 disable_dumping_dynamic_archive();
638 } else {
639 enable_dumping_dynamic_archive();
640 }
641
642 if (AutoCreateSharedArchive) {
643 if (SharedArchiveFile == nullptr) {
644 log_warning(cds)("-XX:+AutoCreateSharedArchive requires -XX:SharedArchiveFile");
645 return false;
646 }
647 if (ArchiveClassesAtExit != nullptr) {
648 log_warning(cds)("-XX:+AutoCreateSharedArchive does not work with ArchiveClassesAtExit");
649 return false;
650 }
651 }
652
653 if (is_using_archive() && patch_mod_javabase) {
654 Arguments::no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
655 }
656 if (is_using_archive() && has_unsupported_runtime_module_options()) {
657 UseSharedSpaces = false;
658 }
659
660 if (is_dumping_archive()) {
661 // Always verify non-system classes during CDS dump
662 if (!BytecodeVerificationRemote) {
663 BytecodeVerificationRemote = true;
664 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
665 }
666 }
667
668 if (AOTClassLinking) {
669 if ((is_dumping_preimage_static_archive() && !is_using_optimized_module_handling()) ||
670 (is_dumping_final_static_archive() && !is_dumping_full_module_graph())) {
671 if (bad_module_prop_key != nullptr) {
672 log_warning(cds)("optimized module handling/full module graph: disabled due to incompatible property: %s=%s",
673 bad_module_prop_key, bad_module_prop_value);
674 }
675 vm_exit_during_initialization("CacheDataStore cannot be created because AOTClassLinking is enabled but full module graph is disabled");
676 }
677 }
678
679 return true;
680 }
681
682 bool CDSConfig::is_dumping_classic_static_archive() {
683 return _is_dumping_static_archive && CacheDataStore == nullptr && CDSPreimage == nullptr;
684 }
685
686 bool CDSConfig::is_dumping_preimage_static_archive() {
687 return _is_dumping_static_archive && CacheDataStore != nullptr && CDSPreimage == nullptr;
688 }
689
690 bool CDSConfig::is_dumping_preimage_static_archive_with_triggers() {
691 return (!FLAG_IS_DEFAULT(AOTEndTrainingOnMethodEntry)) && is_dumping_preimage_static_archive();
692 }
693
694 bool CDSConfig::is_dumping_final_static_archive() {
695 if (CDSPreimage != nullptr) {
696 assert(CacheDataStore != nullptr, "must be"); // should have been properly initialized by arguments.cpp
697 }
698
699 // Note: _is_dumping_static_archive is false! // FIXME -- refactor this so it makes more sense!
700 return CacheDataStore != nullptr && CDSPreimage != nullptr;
701 }
702
703 bool CDSConfig::allow_only_single_java_thread() {
704 // See comments in JVM_StartThread()
705 return is_dumping_classic_static_archive() || is_dumping_final_static_archive();
706 }
707
708 bool CDSConfig::is_dumping_regenerated_lambdaform_invokers() {
709 if (is_dumping_final_static_archive()) {
710 // Not yet supported in new workflow -- the training data may point
711 // to a method in a lambdaform holder class that was not regenerated
712 // due to JDK-8318064.
713 return false;
714 } else {
715 return is_dumping_archive();
716 }
717 }
718
719 bool CDSConfig::is_logging_dynamic_proxies() {
720 return ClassListWriter::is_enabled() || is_dumping_preimage_static_archive();
721 }
722
723 // Preserve all states that were examined used during dumptime verification, such
724 // that the verification result (pass or fail) cannot be changed at runtime.
725 //
726 // For example, if the verification of ik requires that class A must be a subtype of B,
727 // then this relationship between A and B cannot be changed at runtime. I.e., the app
728 // cannot load alternative versions of A and B such that A is not a subtype of B.
729 bool CDSConfig::preserve_all_dumptime_verification_states(const InstanceKlass* ik) {
730 return is_dumping_aot_linked_classes() && SystemDictionaryShared::is_builtin(ik);
731 }
732
733 bool CDSConfig::is_using_archive() {
734 return UseSharedSpaces;
735 }
736
737 bool CDSConfig::is_logging_lambda_form_invokers() {
738 return ClassListWriter::is_enabled() || is_dumping_dynamic_archive() || is_dumping_preimage_static_archive();
739 }
740
741 void CDSConfig::stop_using_optimized_module_handling() {
742 _is_using_optimized_module_handling = false;
743 _is_dumping_full_module_graph = false; // This requires is_using_optimized_module_handling()
744 _is_using_full_module_graph = false; // This requires is_using_optimized_module_handling()
745 }
746
747
748 CDSConfig::DumperThreadMark::DumperThreadMark(JavaThread* current) {
749 assert(_dumper_thread == nullptr, "sanity");
750 _dumper_thread = current;
751 }
752
753 CDSConfig::DumperThreadMark::~DumperThreadMark() {
754 assert(_dumper_thread != nullptr, "sanity");
755 _dumper_thread = nullptr;
756 }
757
758 bool CDSConfig::current_thread_is_vm_or_dumper() {
759 Thread* t = Thread::current();
760 return t != nullptr && (t->is_VM_thread() || t == _dumper_thread);
761 }
762
763 #if INCLUDE_CDS_JAVA_HEAP
764 bool CDSConfig::is_dumping_heap() {
765 return is_dumping_static_archive() && !is_dumping_preimage_static_archive()
766 && HeapShared::can_write();
767 }
768
769 bool CDSConfig::is_loading_heap() {
770 return ArchiveHeapLoader::is_in_use();
771 }
772
773 bool CDSConfig::is_using_full_module_graph() {
774 if (ClassLoaderDataShared::is_full_module_graph_loaded()) {
775 return true;
776 }
777
778 if (!_is_using_full_module_graph) {
779 return false;
780 }
781
782 if (is_using_archive() && ArchiveHeapLoader::can_use()) {
783 // Classes used by the archived full module graph are loaded in JVMTI early phase.
784 assert(!(JvmtiExport::should_post_class_file_load_hook() && JvmtiExport::has_early_class_hook_env()),
785 "CDS should be disabled if early class hooks are enabled");
786 return true;
787 } else {
788 _is_using_full_module_graph = false;
789 return false;
790 }
791 }
792
793 void CDSConfig::stop_dumping_full_module_graph(const char* reason) {
794 if (_is_dumping_full_module_graph) {
795 _is_dumping_full_module_graph = false;
796 if (reason != nullptr) {
797 log_info(cds)("full module graph cannot be dumped: %s", reason);
798 }
799 }
800 }
801
802 void CDSConfig::stop_using_full_module_graph(const char* reason) {
803 assert(!ClassLoaderDataShared::is_full_module_graph_loaded(), "you call this function too late!");
804 if (_is_using_full_module_graph) {
805 _is_using_full_module_graph = false;
806 if (reason != nullptr) {
807 log_info(cds)("full module graph cannot be loaded: %s", reason);
808 }
809 }
810 }
811
812 bool CDSConfig::is_dumping_aot_linked_classes() {
813 if (is_dumping_preimage_static_archive()) {
814 return AOTClassLinking;
815 } else if (is_dumping_dynamic_archive()) {
816 return is_using_full_module_graph() && AOTClassLinking;
817 } else if (is_dumping_static_archive()) {
818 return is_dumping_full_module_graph() && AOTClassLinking;
819 } else {
820 return false;
821 }
822 }
823
824 bool CDSConfig::is_using_aot_linked_classes() {
825 if (is_dumping_final_static_archive()) {
826 // We assume that the final image is being dumped with the exact same module graph as the training run,
827 // so all aot-linked classes can be loaded.
828 return _has_aot_linked_classes;
829 }
830 // Make sure we have the exact same module graph as in the assembly phase, or else
831 // some aot-linked classes may not be visible so cannot be loaded.
832 return is_using_full_module_graph() && _has_aot_linked_classes;
833 }
834
835 bool CDSConfig::is_dumping_dynamic_proxies() {
836 return is_dumping_full_module_graph() && is_dumping_invokedynamic() && ArchiveDynamicProxies;
837 }
838
839 void CDSConfig::set_has_aot_linked_classes(bool has_aot_linked_classes) {
840 _has_aot_linked_classes |= has_aot_linked_classes;
841 }
842
843 bool CDSConfig::is_initing_classes_at_dump_time() {
844 return is_dumping_heap() && is_dumping_aot_linked_classes();
845 }
846
847 bool CDSConfig::is_dumping_invokedynamic() {
848 // Requires is_dumping_aot_linked_classes(). Otherwise the classes of some archived heap
849 // objects used by the archive indy callsites may be replaced at runtime.
850 return AOTInvokeDynamicLinking && is_dumping_aot_linked_classes() && is_dumping_heap();
851 }
852
853 bool CDSConfig::is_dumping_packages() {
854 return ArchivePackages && is_dumping_heap();
855 }
856
857 bool CDSConfig::is_loading_packages() {
858 return UseSharedSpaces && is_using_full_module_graph() && _is_loading_packages;
859 }
860
861 bool CDSConfig::is_dumping_protection_domains() {
862 if (_is_security_manager_allowed) {
863 // For sanity, don't archive PDs. TODO: can this be relaxed?
864 return false;
865 }
866 // Archived PDs for the modules will reference their java.lang.Module, which must
867 // also be archived.
868 return ArchiveProtectionDomains && is_dumping_full_module_graph();
869 }
870
871 bool CDSConfig::is_loading_protection_domains() {
872 if (_is_security_manager_allowed) {
873 // For sanity, don't used any archived PDs. TODO: can this be relaxed?
874 return false;
875 }
876 return UseSharedSpaces && is_using_full_module_graph() && _is_loading_protection_domains;
877 }
878
879 bool CDSConfig::is_dumping_reflection_data() {
880 // reflection data use LambdaForm classes
881 return ArchiveReflectionData && is_dumping_invokedynamic();
882 }
883
884 bool CDSConfig::is_loading_invokedynamic() {
885 return UseSharedSpaces && is_using_full_module_graph() && _has_archived_invokedynamic;
886 }
887
888 #endif // INCLUDE_CDS_JAVA_HEAP
889
890 // This is allowed by default. We disable it only in the final image dump before the
891 // metadata and heap are dumped.
892 static bool _is_dumping_cached_code = true;
893
894 bool CDSConfig::is_dumping_cached_code() {
895 return _is_dumping_cached_code;
896 }
897
898 void CDSConfig::disable_dumping_cached_code() {
899 _is_dumping_cached_code = false;
900 }
901
902 void CDSConfig::enable_dumping_cached_code() {
903 _is_dumping_cached_code = true;
904 }