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 "cds/aotLogging.hpp"
26 #include "cds/aotMapLogger.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/classListWriter.hpp"
29 #include "cds/filemap.hpp"
30 #include "cds/heapShared.inline.hpp"
31 #include "classfile/classLoaderDataShared.hpp"
32 #include "classfile/moduleEntry.hpp"
33 #include "code/aotCodeCache.hpp"
34 #include "include/jvm_io.h"
35 #include "logging/log.hpp"
36 #include "memory/universe.hpp"
37 #include "prims/jvmtiAgentList.hpp"
38 #include "runtime/arguments.hpp"
39 #include "runtime/globals.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_preimage_static_archive = false;
48 bool CDSConfig::_is_dumping_final_static_archive = false;
49 bool CDSConfig::_is_dumping_dynamic_archive = false;
50 bool CDSConfig::_is_using_optimized_module_handling = true;
51 bool CDSConfig::_is_dumping_full_module_graph = true;
52 bool CDSConfig::_is_using_full_module_graph = true;
53 bool CDSConfig::_has_aot_linked_classes = false;
54 bool CDSConfig::_is_single_command_training = false;
55 bool CDSConfig::_has_temp_aot_config_file = false;
56 bool CDSConfig::_old_cds_flags_used = false;
57 bool CDSConfig::_new_aot_flags_used = false;
58 bool CDSConfig::_disable_heap_dumping = false;
59 bool CDSConfig::_is_at_aot_safepoint = false;
60
61 bool CDSConfig::_module_patching_disables_cds = false;
62 bool CDSConfig::_java_base_module_patching_disables_cds = false;
63
64 const char* CDSConfig::_default_archive_path = nullptr;
65 const char* CDSConfig::_input_static_archive_path = nullptr;
66 const char* CDSConfig::_input_dynamic_archive_path = nullptr;
67 const char* CDSConfig::_output_archive_path = nullptr;
68
69 JavaThread* CDSConfig::_dumper_thread = nullptr;
70
71 int CDSConfig::get_status() {
72 assert(Universe::is_fully_initialized(), "status is finalized only after Universe is initialized");
73 return (is_dumping_aot_linked_classes() ? IS_DUMPING_AOT_LINKED_CLASSES : 0) |
74 (is_dumping_archive() ? IS_DUMPING_ARCHIVE : 0) |
75 (is_dumping_method_handles() ? IS_DUMPING_METHOD_HANDLES : 0) |
76 (is_dumping_static_archive() ? IS_DUMPING_STATIC_ARCHIVE : 0) |
77 (is_logging_lambda_form_invokers() ? IS_LOGGING_LAMBDA_FORM_INVOKERS : 0) |
78 (is_using_archive() ? IS_USING_ARCHIVE : 0);
79 }
80
81 DEBUG_ONLY(static bool _cds_ergo_initialize_started = false);
82
83 void CDSConfig::ergo_initialize() {
84 DEBUG_ONLY(_cds_ergo_initialize_started = true);
85
86 if (is_dumping_static_archive() && !is_dumping_final_static_archive()) {
87 // Note: -Xshare and -XX:AOTMode flags are mutually exclusive.
88 // - Classic workflow: -Xshare:on and -Xshare:dump cannot take effect at the same time.
89 // - JEP 483 workflow: -XX:AOTMode:record and -XX:AOTMode=on cannot take effect at the same time.
90 // So we can never come to here with RequireSharedSpaces==true.
91 assert(!RequireSharedSpaces, "sanity");
92
93 // If dumping the classic archive, or making an AOT training run (dumping a preimage archive),
94 // for sanity, parse all classes from classfiles.
95 // TODO: in the future, if we want to support re-training on top of an existing AOT cache, this
96 // needs to be changed.
97 UseSharedSpaces = false;
98 }
99
100 // Initialize shared archive paths which could include both base and dynamic archive paths
101 // This must be after set_ergonomics_flags() called so flag UseCompressedOops is set properly.
102 if (is_dumping_static_archive() || is_using_archive()) {
103 if (new_aot_flags_used()) {
104 ergo_init_aot_paths();
105 } else {
106 ergo_init_classic_archive_paths();
107 }
108 }
109
110 if (!is_dumping_heap()) {
111 _is_dumping_full_module_graph = false;
112 }
113
114 AOTMapLogger::ergo_initialize();
115 }
116
117 const char* CDSConfig::default_archive_path() {
118 // The path depends on UseCompressedOops, etc, which are set by GC ergonomics just
119 // before CDSConfig::ergo_initialize() is called.
120 assert(_cds_ergo_initialize_started, "sanity");
121 if (_default_archive_path == nullptr) {
122 stringStream tmp;
123 if (is_vm_statically_linked()) {
124 // It's easier to form the path using JAVA_HOME as os::jvm_path
125 // gives the path to the launcher executable on static JDK.
126 const char* subdir = WINDOWS_ONLY("bin") NOT_WINDOWS("lib");
127 tmp.print("%s%s%s%s%s%sclasses",
128 Arguments::get_java_home(), os::file_separator(),
129 subdir, os::file_separator(),
130 Abstract_VM_Version::vm_variant(), os::file_separator());
131 } else {
132 // Assume .jsa is in the same directory where libjvm resides on
133 // non-static JDK.
134 char jvm_path[JVM_MAXPATHLEN];
135 os::jvm_path(jvm_path, sizeof(jvm_path));
136 char *end = strrchr(jvm_path, *os::file_separator());
137 if (end != nullptr) *end = '\0';
138 tmp.print("%s%sclasses", jvm_path, os::file_separator());
139 }
140 #ifdef _LP64
141 if (!UseCompressedOops) {
142 tmp.print_raw("_nocoops");
143 }
144 if (UseCompactObjectHeaders) {
145 // Note that generation of xxx_coh.jsa variants require
146 // --enable-cds-archive-coh at build time
147 tmp.print_raw("_coh");
148 }
149 #endif
150 if (is_valhalla_preview()) {
151 tmp.print_raw("_valhalla");
152 }
153 tmp.print_raw(".jsa");
154 _default_archive_path = os::strdup(tmp.base());
155 }
156 return _default_archive_path;
157 }
158
159 int CDSConfig::num_archive_paths(const char* path_spec) {
160 if (path_spec == nullptr) {
161 return 0;
162 }
163 int npaths = 1;
164 char* p = (char*)path_spec;
165 while (*p != '\0') {
166 if (*p == os::path_separator()[0]) {
167 npaths++;
168 }
169 p++;
170 }
171 return npaths;
172 }
173
174 void CDSConfig::extract_archive_paths(const char* archive_path,
175 const char** base_archive_path,
176 const char** top_archive_path) {
177 char* begin_ptr = (char*)archive_path;
178 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
179 if (end_ptr == nullptr || end_ptr == begin_ptr) {
180 vm_exit_during_initialization("Base archive was not specified", archive_path);
181 }
182 size_t len = end_ptr - begin_ptr;
183 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
184 strncpy(cur_path, begin_ptr, len);
185 cur_path[len] = '\0';
186 *base_archive_path = cur_path;
187
188 begin_ptr = ++end_ptr;
189 if (*begin_ptr == '\0') {
190 vm_exit_during_initialization("Top archive was not specified", archive_path);
191 }
192 end_ptr = strchr(begin_ptr, '\0');
193 assert(end_ptr != nullptr, "sanity");
194 len = end_ptr - begin_ptr;
195 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
196 strncpy(cur_path, begin_ptr, len + 1);
197 *top_archive_path = cur_path;
198 }
199
200 void CDSConfig::ergo_init_classic_archive_paths() {
201 assert(_cds_ergo_initialize_started, "sanity");
202 if (ArchiveClassesAtExit != nullptr) {
203 assert(!RecordDynamicDumpInfo, "already checked");
204 if (is_dumping_static_archive()) {
205 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
206 }
207 check_unsupported_dumping_module_options();
208
209 if (os::same_files(default_archive_path(), ArchiveClassesAtExit)) {
210 vm_exit_during_initialization(
211 "Cannot specify the default CDS archive for -XX:ArchiveClassesAtExit", default_archive_path());
212 }
213 }
214
215 if (SharedArchiveFile == nullptr) {
216 _input_static_archive_path = default_archive_path();
217 if (is_dumping_static_archive()) {
218 _output_archive_path = _input_static_archive_path;
219 }
220 } else {
221 int num_archives = num_archive_paths(SharedArchiveFile);
222 assert(num_archives > 0, "must be");
223
224 if (is_dumping_archive() && num_archives > 1) {
225 vm_exit_during_initialization(
226 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
227 }
228
229 if (is_dumping_static_archive()) {
230 assert(num_archives == 1, "just checked above");
231 // Static dump is simple: only one archive is allowed in SharedArchiveFile. This file
232 // will be overwritten regardless of its contents
233 _output_archive_path = SharedArchiveFile;
234 } else {
235 // SharedArchiveFile may specify one or two files. In case (c), the path for base.jsa
236 // is read from top.jsa
237 // (a) 1 file: -XX:SharedArchiveFile=base.jsa
238 // (b) 2 files: -XX:SharedArchiveFile=base.jsa:top.jsa
239 // (c) 2 files: -XX:SharedArchiveFile=top.jsa
240 //
241 // However, if either RecordDynamicDumpInfo or ArchiveClassesAtExit is used, we do not
242 // allow cases (b) and (c). Case (b) is already checked above.
243
244 if (num_archives > 2) {
245 vm_exit_during_initialization(
246 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
247 }
248
249 if (num_archives == 1) {
250 const char* base_archive_path = nullptr;
251 bool success =
252 FileMapInfo::get_base_archive_name_from_header(SharedArchiveFile, &base_archive_path);
253 if (!success) {
254 // If +AutoCreateSharedArchive and the specified shared archive does not exist,
255 // regenerate the dynamic archive base on default archive.
256 if (AutoCreateSharedArchive && !os::file_exists(SharedArchiveFile)) {
257 enable_dumping_dynamic_archive(SharedArchiveFile);
258 FLAG_SET_ERGO(ArchiveClassesAtExit, SharedArchiveFile);
259 _input_static_archive_path = default_archive_path();
260 FLAG_SET_ERGO(SharedArchiveFile, nullptr);
261 } else {
262 if (AutoCreateSharedArchive) {
263 warning("-XX:+AutoCreateSharedArchive is unsupported when base CDS archive is not loaded. Run with -Xlog:cds for more info.");
264 AutoCreateSharedArchive = false;
265 }
266 aot_log_error(aot)("Not a valid %s (%s)", type_of_archive_being_loaded(), SharedArchiveFile);
267 Arguments::no_shared_spaces("invalid archive");
268 }
269 } else if (base_archive_path == nullptr) {
270 // User has specified a single archive, which is a static archive.
271 _input_static_archive_path = SharedArchiveFile;
272 } else {
273 // User has specified a single archive, which is a dynamic archive.
274 _input_dynamic_archive_path = SharedArchiveFile;
275 _input_static_archive_path = base_archive_path; // has been c-heap allocated.
276 }
277 } else {
278 extract_archive_paths(SharedArchiveFile,
279 &_input_static_archive_path, &_input_dynamic_archive_path);
280 if (_input_static_archive_path == nullptr) {
281 assert(_input_dynamic_archive_path == nullptr, "must be");
282 Arguments::no_shared_spaces("invalid archive");
283 }
284 }
285
286 if (_input_dynamic_archive_path != nullptr) {
287 // Check for case (c)
288 if (RecordDynamicDumpInfo) {
289 vm_exit_during_initialization("-XX:+RecordDynamicDumpInfo is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile",
290 SharedArchiveFile);
291 }
292 if (ArchiveClassesAtExit != nullptr) {
293 vm_exit_during_initialization("-XX:ArchiveClassesAtExit is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile",
294 SharedArchiveFile);
295 }
296 }
297
298 if (ArchiveClassesAtExit != nullptr && os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
299 vm_exit_during_initialization(
300 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
301 SharedArchiveFile);
302 }
303 }
304 }
305 }
306
307 void CDSConfig::check_internal_module_property(const char* key, const char* value) {
308 if (Arguments::is_incompatible_cds_internal_module_property(key) && !Arguments::patching_migrated_classes(key, value)) {
309 stop_using_optimized_module_handling();
310 aot_log_info(aot)("optimized module handling: disabled due to incompatible property: %s=%s", key, value);
311 }
312 }
313
314 void CDSConfig::check_incompatible_property(const char* key, const char* value) {
315 static const char* incompatible_properties[] = {
316 "java.system.class.loader",
317 "jdk.module.showModuleResolution",
318 "jdk.module.validation"
319 };
320
321 for (const char* property : incompatible_properties) {
322 if (strcmp(key, property) == 0) {
323 stop_dumping_full_module_graph();
324 stop_using_full_module_graph();
325 aot_log_info(aot)("full module graph: disabled due to incompatible property: %s=%s", key, value);
326 break;
327 }
328 }
329
330 }
331
332 // Returns any JVM command-line option, such as "--patch-module", that's not supported by CDS.
333 static const char* find_any_unsupported_module_option() {
334 // Note that arguments.cpp has translated the command-line options into properties. If we find an
335 // unsupported property, translate it back to its command-line option for better error reporting.
336
337 // The following properties are checked by Arguments::is_internal_module_property() and cannot be
338 // directly specified in the command-line.
339 static const char* unsupported_module_properties[] = {
340 "jdk.module.limitmods",
341 "jdk.module.upgrade.path"
342 };
343 static const char* unsupported_module_options[] = {
344 "--limit-modules",
345 "--upgrade-module-path"
346 };
347
348 assert(ARRAY_SIZE(unsupported_module_properties) == ARRAY_SIZE(unsupported_module_options), "must be");
349 SystemProperty* sp = Arguments::system_properties();
350 while (sp != nullptr) {
351 for (uint i = 0; i < ARRAY_SIZE(unsupported_module_properties); i++) {
352 if (strcmp(sp->key(), unsupported_module_properties[i]) == 0) {
353 return unsupported_module_options[i];
354 }
355 }
356 sp = sp->next();
357 }
358
359 return nullptr; // not found
360 }
361
362 void CDSConfig::check_unsupported_dumping_module_options() {
363 assert(is_dumping_archive(), "this function is only used with CDS dump time");
364 const char* option = find_any_unsupported_module_option();
365 if (option != nullptr) {
366 vm_exit_during_initialization("Cannot use the following option when dumping the shared archive", option);
367 }
368
369 if (module_patching_disables_cds()) {
370 vm_exit_during_initialization(
371 "Cannot use the following option when dumping the shared archive", "--patch-module");
372 }
373
374 // Check for an exploded module build in use with -Xshare:dump.
375 if (!Arguments::has_jimage()) {
376 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
377 }
378 }
379
380 bool CDSConfig::has_unsupported_runtime_module_options() {
381 assert(is_using_archive(), "this function is only used with -Xshare:{on,auto}");
382 if (ArchiveClassesAtExit != nullptr) {
383 // dynamic dumping, just return false for now.
384 // check_unsupported_dumping_properties() will be called later to check the same set of
385 // properties, and will exit the VM with the correct error message if the unsupported properties
386 // are used.
387 return false;
388 }
389 const char* option = find_any_unsupported_module_option();
390 if (option != nullptr) {
391 if (RequireSharedSpaces) {
392 warning("CDS is disabled when the %s option is specified.", option);
393 } else {
394 if (new_aot_flags_used()) {
395 aot_log_warning(aot)("AOT cache is disabled when the %s option is specified.", option);
396 } else {
397 aot_log_info(aot)("CDS is disabled when the %s option is specified.", option);
398 }
399 }
400 return true;
401 }
402
403 if (module_patching_disables_cds()) {
404 if (RequireSharedSpaces) {
405 warning("CDS is disabled when the %s option is specified.", "--patch-module");
406 } else {
407 log_info(cds)("CDS is disabled when the %s option is specified.", "--patch-module");
408 }
409 return true;
410 }
411
412 return false;
413 }
414
415 #define CHECK_NEW_FLAG(f) check_new_flag(FLAG_IS_DEFAULT(f), #f)
416
417 void CDSConfig::check_new_flag(bool new_flag_is_default, const char* new_flag_name) {
418 if (old_cds_flags_used() && !new_flag_is_default) {
419 vm_exit_during_initialization(err_msg("Option %s cannot be used at the same time with "
420 "-Xshare:on, -Xshare:auto, -Xshare:off, -Xshare:dump, "
421 "DumpLoadedClassList, SharedClassListFile, or SharedArchiveFile",
422 new_flag_name));
423 }
424 }
425
426 #define CHECK_SINGLE_PATH(f) check_flag_single_path(#f, f)
427
428 void CDSConfig::check_flag_single_path(const char* flag_name, const char* value) {
429 if (value != nullptr && num_archive_paths(value) != 1) {
430 vm_exit_during_initialization(err_msg("Option %s must specify a single file name", flag_name));
431 }
432 }
433
434 void CDSConfig::check_aot_flags() {
435 if (!FLAG_IS_DEFAULT(DumpLoadedClassList) ||
436 !FLAG_IS_DEFAULT(SharedClassListFile) ||
437 !FLAG_IS_DEFAULT(SharedArchiveFile)) {
438 _old_cds_flags_used = true;
439 }
440
441 // "New" AOT flags must not be mixed with "classic" CDS flags such as -Xshare:dump
442 CHECK_NEW_FLAG(AOTCache);
443 CHECK_NEW_FLAG(AOTCacheOutput);
444 CHECK_NEW_FLAG(AOTConfiguration);
445 CHECK_NEW_FLAG(AOTMode);
446
447 CHECK_SINGLE_PATH(AOTCache);
448 CHECK_SINGLE_PATH(AOTCacheOutput);
449 CHECK_SINGLE_PATH(AOTConfiguration);
450
451 if (FLAG_IS_DEFAULT(AOTCache) && AOTAdapterCaching) {
452 log_debug(aot,codecache,init)("AOTCache is not specified - AOTAdapterCaching is ignored");
453 }
454 if (FLAG_IS_DEFAULT(AOTCache) && AOTStubCaching) {
455 log_debug(aot,codecache,init)("AOTCache is not specified - AOTStubCaching is ignored");
456 }
457
458 bool has_cache = !FLAG_IS_DEFAULT(AOTCache);
459 bool has_cache_output = !FLAG_IS_DEFAULT(AOTCacheOutput);
460 bool has_config = !FLAG_IS_DEFAULT(AOTConfiguration);
461 bool has_mode = !FLAG_IS_DEFAULT(AOTMode);
462
463 if (!has_cache && !has_cache_output && !has_config && !has_mode) {
464 // AOT flags are not used. Use classic CDS workflow
465 return;
466 }
467
468 if (has_cache && has_cache_output) {
469 vm_exit_during_initialization("Only one of AOTCache or AOTCacheOutput can be specified");
470 }
471
472 if (!has_cache && (!has_mode || strcmp(AOTMode, "auto") == 0)) {
473 if (has_cache_output) {
474 // If AOTCacheOutput has been set, effective mode is "record".
475 // Default value for AOTConfiguration, if necessary, will be assigned in check_aotmode_record().
476 log_info(aot)("Selected AOTMode=record because AOTCacheOutput is specified");
477 FLAG_SET_ERGO(AOTMode, "record");
478 }
479 }
480
481 // At least one AOT flag has been used
482 _new_aot_flags_used = true;
483
484 if (FLAG_IS_DEFAULT(AOTMode) || strcmp(AOTMode, "auto") == 0 || strcmp(AOTMode, "on") == 0) {
485 check_aotmode_auto_or_on();
486 } else if (strcmp(AOTMode, "off") == 0) {
487 check_aotmode_off();
488 } else if (strcmp(AOTMode, "record") == 0) {
489 check_aotmode_record();
490 } else {
491 assert(strcmp(AOTMode, "create") == 0, "checked by AOTModeConstraintFunc");
492 check_aotmode_create();
493 }
494 }
495
496 void CDSConfig::check_aotmode_off() {
497 UseSharedSpaces = false;
498 RequireSharedSpaces = false;
499 }
500
501 void CDSConfig::check_aotmode_auto_or_on() {
502 if (!FLAG_IS_DEFAULT(AOTConfiguration)) {
503 vm_exit_during_initialization(err_msg("AOTConfiguration can only be used with when AOTMode is record or create (selected AOTMode = %s)",
504 FLAG_IS_DEFAULT(AOTMode) ? "auto" : AOTMode));
505 }
506
507 UseSharedSpaces = true;
508 if (FLAG_IS_DEFAULT(AOTMode) || (strcmp(AOTMode, "auto") == 0)) {
509 RequireSharedSpaces = false;
510 } else {
511 assert(strcmp(AOTMode, "on") == 0, "already checked");
512 RequireSharedSpaces = true;
513 }
514 }
515
516 // %p substitution in AOTCache, AOTCacheOutput and AOTCacheConfiguration
517 static void substitute_aot_filename(JVMFlagsEnum flag_enum) {
518 JVMFlag* flag = JVMFlag::flag_from_enum(flag_enum);
519 const char* filename = flag->read<const char*>();
520 assert(filename != nullptr, "must not have default value");
521
522 // For simplicity, we don't allow %p/%t to be specified twice, because make_log_name()
523 // substitutes only the first occurrence. Otherwise, if we run with
524 // java -XX:AOTCacheOutput=%p%p.aot
525 // it will end up with both the pid of the training process and the assembly process.
526 const char* first_p = strstr(filename, "%p");
527 if (first_p != nullptr && strstr(first_p + 2, "%p") != nullptr) {
528 vm_exit_during_initialization(err_msg("%s cannot contain more than one %%p", flag->name()));
529 }
530 const char* first_t = strstr(filename, "%t");
531 if (first_t != nullptr && strstr(first_t + 2, "%t") != nullptr) {
532 vm_exit_during_initialization(err_msg("%s cannot contain more than one %%t", flag->name()));
533 }
534
535 // Note: with single-command training, %p will be the pid of the training process, not the
536 // assembly process.
537 const char* new_filename = make_log_name(filename, nullptr);
538 if (strcmp(filename, new_filename) != 0) {
539 JVMFlag::Error err = JVMFlagAccess::set_ccstr(flag, &new_filename, JVMFlagOrigin::ERGONOMIC);
540 assert(err == JVMFlag::SUCCESS, "must never fail");
541 }
542 FREE_C_HEAP_ARRAY(char, new_filename);
543 }
544
545 void CDSConfig::check_aotmode_record() {
546 bool has_config = !FLAG_IS_DEFAULT(AOTConfiguration);
547 bool has_output = !FLAG_IS_DEFAULT(AOTCacheOutput);
548
549 if (!has_output && !has_config) {
550 vm_exit_during_initialization("At least one of AOTCacheOutput and AOTConfiguration must be specified when using -XX:AOTMode=record");
551 }
552
553 if (has_output) {
554 _is_single_command_training = true;
555 substitute_aot_filename(FLAG_MEMBER_ENUM(AOTCacheOutput));
556 if (!has_config) {
557 // Too early; can't use resource allocation yet.
558 size_t len = strlen(AOTCacheOutput) + 10;
559 char* temp = AllocateHeap(len, mtArguments);
560 jio_snprintf(temp, len, "%s.config", AOTCacheOutput);
561 FLAG_SET_ERGO(AOTConfiguration, temp);
562 FreeHeap(temp);
563 _has_temp_aot_config_file = true;
564 }
565 }
566
567 if (!FLAG_IS_DEFAULT(AOTCache)) {
568 vm_exit_during_initialization("AOTCache must not be specified when using -XX:AOTMode=record");
569 }
570
571 substitute_aot_filename(FLAG_MEMBER_ENUM(AOTConfiguration));
572
573 UseSharedSpaces = false;
574 RequireSharedSpaces = false;
575 _is_dumping_static_archive = true;
576 _is_dumping_preimage_static_archive = true;
577
578 // At VM exit, the module graph may be contaminated with program states.
579 // We will rebuild the module graph when dumping the CDS final image.
580 disable_heap_dumping();
581 }
582
583 void CDSConfig::check_aotmode_create() {
584 if (FLAG_IS_DEFAULT(AOTConfiguration)) {
585 vm_exit_during_initialization("AOTConfiguration must be specified when using -XX:AOTMode=create");
586 }
587
588 bool has_cache = !FLAG_IS_DEFAULT(AOTCache);
589 bool has_cache_output = !FLAG_IS_DEFAULT(AOTCacheOutput);
590
591 assert(!(has_cache && has_cache_output), "already checked");
592
593 if (!has_cache && !has_cache_output) {
594 vm_exit_during_initialization("AOTCache or AOTCacheOutput must be specified when using -XX:AOTMode=create");
595 }
596
597 if (!has_cache) {
598 precond(has_cache_output);
599 FLAG_SET_ERGO(AOTCache, AOTCacheOutput);
600 }
601 // No need to check for (!has_cache_output), as we don't look at AOTCacheOutput after here.
602
603 substitute_aot_filename(FLAG_MEMBER_ENUM(AOTCache));
604
605 _is_dumping_final_static_archive = true;
606 UseSharedSpaces = true;
607 RequireSharedSpaces = true;
608
609 if (!FileMapInfo::is_preimage_static_archive(AOTConfiguration)) {
610 vm_exit_during_initialization("Must be a valid AOT configuration generated by the current JVM", AOTConfiguration);
611 }
612
613 CDSConfig::enable_dumping_static_archive();
614
615 // We don't load any agents in the assembly phase, so we can ensure that the agents
616 // cannot affect the contents of the AOT cache. E.g., we don't want the agents to
617 // redefine any cached classes. We also don't want the agents to modify heap objects that
618 // are cached.
619 //
620 // Since application is not executed in the assembly phase, there's no need to load
621 // the agents anyway -- no one will notice that the agents are not loaded.
622 log_info(aot)("Disabled all JVMTI agents during -XX:AOTMode=create");
623 JvmtiAgentList::disable_agent_list();
624 }
625
626 void CDSConfig::ergo_init_aot_paths() {
627 assert(_cds_ergo_initialize_started, "sanity");
628 if (is_dumping_static_archive()) {
629 if (is_dumping_preimage_static_archive()) {
630 _output_archive_path = AOTConfiguration;
631 } else {
632 assert(is_dumping_final_static_archive(), "must be");
633 _input_static_archive_path = AOTConfiguration;
634 _output_archive_path = AOTCache;
635 }
636 } else if (is_using_archive()) {
637 if (FLAG_IS_DEFAULT(AOTCache)) {
638 // Only -XX:AOTMode={auto,on} is specified
639 _input_static_archive_path = default_archive_path();
640 } else {
641 _input_static_archive_path = AOTCache;
642 }
643 }
644 }
645
646 bool CDSConfig::check_vm_args_consistency(bool mode_flag_cmd_line) {
647 assert(!_cds_ergo_initialize_started, "This is called earlier than CDSConfig::ergo_initialize()");
648
649 check_aot_flags();
650
651 if (!FLAG_IS_DEFAULT(AOTMode)) {
652 // Using any form of the new AOTMode switch enables enhanced optimizations.
653 FLAG_SET_ERGO_IF_DEFAULT(AOTClassLinking, true);
654 }
655
656 setup_compiler_args();
657
658 if (AOTClassLinking) {
659 // If AOTClassLinking is specified, enable all AOT optimizations by default.
660 FLAG_SET_ERGO_IF_DEFAULT(AOTInvokeDynamicLinking, true);
661 } else {
662 // AOTInvokeDynamicLinking depends on AOTClassLinking.
663 FLAG_SET_ERGO(AOTInvokeDynamicLinking, false);
664 }
665
666 if (is_dumping_static_archive()) {
667 if (is_dumping_preimage_static_archive()) {
668 // Don't tweak execution mode during AOT training run
669 } else if (is_dumping_final_static_archive()) {
670 if (Arguments::mode() == Arguments::_comp) {
671 // AOT assembly phase submits the non-blocking compilation requests
672 // for methods collected during training run, then waits for all compilations
673 // to complete. With -Xcomp, we block for each compilation request, which is
674 // counter-productive. Switching back to mixed mode improves testing time
675 // with AOT and -Xcomp.
676 Arguments::set_mode_flags(Arguments::_mixed);
677 }
678 } else if (!mode_flag_cmd_line) {
679 // By default, -Xshare:dump runs in interpreter-only mode, which is required for deterministic archive.
680 //
681 // If your classlist is large and you don't care about deterministic dumping, you can use
682 // -Xshare:dump -Xmixed to improve dumping speed.
683 Arguments::set_mode_flags(Arguments::_int);
684 } else if (Arguments::mode() == Arguments::_comp) {
685 // -Xcomp may use excessive CPU for the test tiers. Also, -Xshare:dump runs a small and fixed set of
686 // Java code, so there's not much benefit in running -Xcomp.
687 aot_log_info(aot)("reduced -Xcomp to -Xmixed for static dumping");
688 Arguments::set_mode_flags(Arguments::_mixed);
689 }
690
691 // String deduplication may cause CDS to iterate the strings in different order from one
692 // run to another which resulting in non-determinstic CDS archives.
693 // Disable UseStringDeduplication while dumping CDS archive.
694 UseStringDeduplication = false;
695 }
696
697 // RecordDynamicDumpInfo is not compatible with ArchiveClassesAtExit
698 if (ArchiveClassesAtExit != nullptr && RecordDynamicDumpInfo) {
699 jio_fprintf(defaultStream::output_stream(),
700 "-XX:+RecordDynamicDumpInfo cannot be used with -XX:ArchiveClassesAtExit.\n");
701 return false;
702 }
703
704 if (ArchiveClassesAtExit == nullptr && !RecordDynamicDumpInfo) {
705 disable_dumping_dynamic_archive();
706 } else {
707 enable_dumping_dynamic_archive(ArchiveClassesAtExit);
708 }
709
710 if (AutoCreateSharedArchive) {
711 if (SharedArchiveFile == nullptr) {
712 aot_log_warning(aot)("-XX:+AutoCreateSharedArchive requires -XX:SharedArchiveFile");
713 return false;
714 }
715 if (ArchiveClassesAtExit != nullptr) {
716 aot_log_warning(aot)("-XX:+AutoCreateSharedArchive does not work with ArchiveClassesAtExit");
717 return false;
718 }
719 }
720
721 if (is_using_archive() && java_base_module_patching_disables_cds() && module_patching_disables_cds()) {
722 Arguments::no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
723 }
724 if (is_using_archive() && has_unsupported_runtime_module_options()) {
725 UseSharedSpaces = false;
726 }
727
728 if (is_dumping_archive()) {
729 // Always verify non-system classes during CDS dump
730 if (!BytecodeVerificationRemote) {
731 BytecodeVerificationRemote = true;
732 aot_log_info(aot)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
733 }
734 }
735
736 return true;
737 }
738
739 void CDSConfig::setup_compiler_args() {
740 // AOT profiles and AOT-compiled code are supported only in the JEP 483 workflow.
741 bool can_dump_profile_and_compiled_code = AOTClassLinking && new_aot_flags_used();
742
743 if (is_dumping_preimage_static_archive() && can_dump_profile_and_compiled_code) {
744 // JEP 483 workflow -- training
745 FLAG_SET_ERGO_IF_DEFAULT(AOTRecordTraining, true);
746 FLAG_SET_ERGO(AOTReplayTraining, false);
747 AOTCodeCache::disable_caching(); // No AOT code generation during training run
748 } else if (is_dumping_final_static_archive() && can_dump_profile_and_compiled_code) {
749 // JEP 483 workflow -- assembly
750 FLAG_SET_ERGO(AOTRecordTraining, false);
751 FLAG_SET_ERGO_IF_DEFAULT(AOTReplayTraining, true);
752 AOTCodeCache::enable_caching(); // Generate AOT code during assembly phase.
753 disable_dumping_aot_code(); // Don't dump AOT code until metadata and heap are dumped.
754 } else if (is_using_archive() && new_aot_flags_used()) {
755 // JEP 483 workflow -- production
756 FLAG_SET_ERGO(AOTRecordTraining, false);
757 FLAG_SET_ERGO_IF_DEFAULT(AOTReplayTraining, true);
758 AOTCodeCache::enable_caching();
759 } else {
760 FLAG_SET_ERGO(AOTReplayTraining, false);
761 FLAG_SET_ERGO(AOTRecordTraining, false);
762 AOTCodeCache::disable_caching();
763 }
764 }
765
766 void CDSConfig::prepare_for_dumping() {
767 assert(CDSConfig::is_dumping_archive(), "sanity");
768
769 if (is_dumping_dynamic_archive() && AOTClassLinking) {
770 if (FLAG_IS_CMDLINE(AOTClassLinking)) {
771 log_warning(cds)("AOTClassLinking is not supported for dynamic CDS archive");
772 }
773 FLAG_SET_ERGO(AOTClassLinking, false);
774 }
775
776 if (is_dumping_dynamic_archive() && !is_using_archive()) {
777 assert(!is_dumping_static_archive(), "cannot be dumping both static and dynamic archives");
778
779 // This could happen if SharedArchiveFile has failed to load:
780 // - -Xshare:off was specified
781 // - SharedArchiveFile points to an non-existent file.
782 // - SharedArchiveFile points to an archive that has failed CRC check
783 // - SharedArchiveFile is not specified and the VM doesn't have a compatible default archive
784
785 #define __THEMSG " is unsupported when base CDS archive is not loaded. Run with -Xlog:cds for more info."
786 if (RecordDynamicDumpInfo) {
787 aot_log_error(aot)("-XX:+RecordDynamicDumpInfo%s", __THEMSG);
788 AOTMetaspace::unrecoverable_loading_error();
789 } else {
790 assert(ArchiveClassesAtExit != nullptr, "sanity");
791 aot_log_warning(aot)("-XX:ArchiveClassesAtExit" __THEMSG);
792 }
793 #undef __THEMSG
794 disable_dumping_dynamic_archive();
795 return;
796 }
797
798 check_unsupported_dumping_module_options();
799 }
800
801 bool CDSConfig::is_dumping_classic_static_archive() {
802 return _is_dumping_static_archive &&
803 !is_dumping_preimage_static_archive() &&
804 !is_dumping_final_static_archive();
805 }
806
807 bool CDSConfig::is_dumping_preimage_static_archive() {
808 return _is_dumping_preimage_static_archive;
809 }
810
811 bool CDSConfig::is_dumping_final_static_archive() {
812 return _is_dumping_final_static_archive;
813 }
814
815 void CDSConfig::enable_dumping_dynamic_archive(const char* output_path) {
816 _is_dumping_dynamic_archive = true;
817 if (output_path == nullptr) {
818 // output_path can be null when the VM is started with -XX:+RecordDynamicDumpInfo
819 // in anticipation of "jcmd VM.cds dynamic_dump", which will provide the actual
820 // output path.
821 _output_archive_path = nullptr;
822 } else {
823 _output_archive_path = os::strdup_check_oom(output_path, mtArguments);
824 }
825 }
826
827 bool CDSConfig::allow_only_single_java_thread() {
828 // See comments in JVM_StartThread()
829 return is_dumping_classic_static_archive() || is_dumping_final_static_archive();
830 }
831
832 bool CDSConfig::is_using_archive() {
833 return UseSharedSpaces;
834 }
835
836 bool CDSConfig::is_using_only_default_archive() {
837 return is_using_archive() &&
838 input_static_archive_path() != nullptr &&
839 default_archive_path() != nullptr &&
840 strcmp(input_static_archive_path(), default_archive_path()) == 0 &&
841 input_dynamic_archive_path() == nullptr;
842 }
843
844 bool CDSConfig::is_logging_lambda_form_invokers() {
845 return ClassListWriter::is_enabled() || is_dumping_dynamic_archive();
846 }
847
848 bool CDSConfig::is_dumping_regenerated_lambdaform_invokers() {
849 if (is_dumping_final_static_archive()) {
850 // No need to regenerate -- the lambda form invokers should have been regenerated
851 // in the preimage archive (if allowed)
852 return false;
853 } else if (is_dumping_dynamic_archive() && is_using_aot_linked_classes()) {
854 // The base archive has aot-linked classes that may have AOT-resolved CP references
855 // that point to the lambda form invokers in the base archive. Such pointers will
856 // be invalid if lambda form invokers are regenerated in the dynamic archive.
857 return false;
858 } else {
859 return is_dumping_archive();
860 }
861 }
862
863 void CDSConfig::stop_using_optimized_module_handling() {
864 _is_using_optimized_module_handling = false;
865 _is_dumping_full_module_graph = false; // This requires is_using_optimized_module_handling()
866 _is_using_full_module_graph = false; // This requires is_using_optimized_module_handling()
867 }
868
869
870 CDSConfig::DumperThreadMark::DumperThreadMark(JavaThread* current) {
871 assert(_dumper_thread == nullptr, "sanity");
872 _dumper_thread = current;
873 }
874
875 CDSConfig::DumperThreadMark::~DumperThreadMark() {
876 assert(_dumper_thread != nullptr, "sanity");
877 _dumper_thread = nullptr;
878 }
879
880 bool CDSConfig::current_thread_is_vm_or_dumper() {
881 Thread* t = Thread::current();
882 return t->is_VM_thread() || t == _dumper_thread;
883 }
884
885 bool CDSConfig::current_thread_is_dumper() {
886 return Thread::current() == _dumper_thread;
887 }
888
889 const char* CDSConfig::type_of_archive_being_loaded() {
890 if (is_dumping_final_static_archive()) {
891 return "AOT configuration file";
892 } else if (new_aot_flags_used()) {
893 return "AOT cache";
894 } else {
895 return "shared archive file";
896 }
897 }
898
899 const char* CDSConfig::type_of_archive_being_written() {
900 if (is_dumping_preimage_static_archive()) {
901 return "AOT configuration file";
902 } else if (new_aot_flags_used()) {
903 return "AOT cache";
904 } else {
905 return "shared archive file";
906 }
907 }
908
909 // If an incompatible VM options is found, return a text message that explains why
910 static const char* check_options_incompatible_with_dumping_heap() {
911 #if INCLUDE_CDS_JAVA_HEAP
912 if (!UseCompressedClassPointers) {
913 return "UseCompressedClassPointers must be true";
914 }
915
916 return nullptr;
917 #else
918 return "JVM not configured for writing Java heap objects";
919 #endif
920 }
921
922 void CDSConfig::log_reasons_for_not_dumping_heap() {
923 const char* reason;
924
925 assert(!is_dumping_heap(), "sanity");
926
927 if (_disable_heap_dumping) {
928 reason = "Programmatically disabled";
929 } else {
930 reason = check_options_incompatible_with_dumping_heap();
931 }
932
933 assert(reason != nullptr, "sanity");
934 aot_log_info(aot)("Archived java heap is not supported: %s", reason);
935 }
936
937 // This is *Legacy* optimization for lambdas before JEP 483. May be removed in the future.
938 bool CDSConfig::is_dumping_lambdas_in_legacy_mode() {
939 return !is_dumping_method_handles();
940 }
941
942 bool CDSConfig::is_preserving_verification_constraints() {
943 // Verification dependencies are classes used in assignability checks by the
944 // bytecode verifier. In the following example, the verification dependencies
945 // for X are A and B.
946 //
947 // class X {
948 // A getA() { return new B(); }
949 // }
950 //
951 // With the AOT cache, we can ensure that all the verification dependencies
952 // (A and B in the above example) are unconditionally loaded during the bootstrap
953 // of the production run. This means that if a class was successfully verified
954 // in the assembly phase, all of the verifier's assignability checks will remain
955 // valid in the production run, so we don't need to verify aot-linked classes again.
956
957 if (is_dumping_preimage_static_archive()) { // writing AOT config
958 return AOTClassLinking;
959 } else if (is_dumping_final_static_archive()) { // writing AOT cache
960 return is_dumping_aot_linked_classes();
961 } else if (is_dumping_classic_static_archive()) {
962 return is_dumping_aot_linked_classes();
963 } else {
964 return false;
965 }
966 }
967
968 bool CDSConfig::is_old_class_for_verifier(const InstanceKlass* ik) {
969 return ik->major_version() < 50 /*JAVA_6_VERSION*/;
970 }
971
972 #if INCLUDE_CDS_JAVA_HEAP
973 bool CDSConfig::are_vm_options_incompatible_with_dumping_heap() {
974 return check_options_incompatible_with_dumping_heap() != nullptr;
975 }
976
977 bool CDSConfig::is_dumping_heap() {
978 if (is_valhalla_preview()) {
979 // Not working yet -- e.g., HeapShared::oop_hash() needs to be implemented for value oops
980 return false;
981 }
982 if (!(is_dumping_classic_static_archive() || is_dumping_final_static_archive())
983 || are_vm_options_incompatible_with_dumping_heap()
984 || _disable_heap_dumping) {
985 return false;
986 }
987 return true;
988 }
989
990 bool CDSConfig::is_loading_heap() {
991 return HeapShared::is_archived_heap_in_use();
992 }
993
994 bool CDSConfig::is_using_full_module_graph() {
995 if (ClassLoaderDataShared::is_full_module_graph_loaded()) {
996 return true;
997 }
998
999 if (!_is_using_full_module_graph) {
1000 return false;
1001 }
1002
1003 if (is_using_archive() && HeapShared::can_use_archived_heap()) {
1004 // Classes used by the archived full module graph are loaded in JVMTI early phase.
1005 assert(!(JvmtiExport::should_post_class_file_load_hook() && JvmtiExport::has_early_class_hook_env()),
1006 "CDS should be disabled if early class hooks are enabled");
1007 return true;
1008 } else {
1009 _is_using_full_module_graph = false;
1010 return false;
1011 }
1012 }
1013
1014 void CDSConfig::stop_dumping_full_module_graph(const char* reason) {
1015 if (_is_dumping_full_module_graph) {
1016 _is_dumping_full_module_graph = false;
1017 if (reason != nullptr) {
1018 aot_log_info(aot)("full module graph cannot be dumped: %s", reason);
1019 }
1020 }
1021 }
1022
1023 void CDSConfig::stop_using_full_module_graph(const char* reason) {
1024 assert(!ClassLoaderDataShared::is_full_module_graph_loaded(), "you call this function too late!");
1025 if (_is_using_full_module_graph) {
1026 _is_using_full_module_graph = false;
1027 if (reason != nullptr) {
1028 aot_log_info(aot)("full module graph cannot be loaded: %s", reason);
1029 }
1030 }
1031 }
1032
1033 bool CDSConfig::is_dumping_aot_linked_classes() {
1034 if (is_dumping_classic_static_archive() || is_dumping_final_static_archive()) {
1035 // FMG is required to guarantee that all cached boot/platform/app classes
1036 // are visible in the production run, so they can be unconditionally
1037 // loaded during VM bootstrap.
1038 return is_dumping_full_module_graph() && AOTClassLinking;
1039 } else {
1040 return false;
1041 }
1042 }
1043
1044 bool CDSConfig::is_using_aot_linked_classes() {
1045 // Make sure we have the exact same module graph as in the assembly phase, or else
1046 // some aot-linked classes may not be visible so cannot be loaded.
1047 return is_using_full_module_graph() && _has_aot_linked_classes;
1048 }
1049
1050 void CDSConfig::set_has_aot_linked_classes(bool has_aot_linked_classes) {
1051 _has_aot_linked_classes |= has_aot_linked_classes;
1052 }
1053
1054 bool CDSConfig::is_initing_classes_at_dump_time() {
1055 return is_dumping_heap() && is_dumping_aot_linked_classes();
1056 }
1057
1058 bool CDSConfig::is_dumping_invokedynamic() {
1059 // Requires is_dumping_aot_linked_classes(). Otherwise the classes of some archived heap
1060 // objects used by the archive indy callsites may be replaced at runtime.
1061 return AOTInvokeDynamicLinking && is_dumping_aot_linked_classes() && is_dumping_heap();
1062 }
1063
1064 // When we are dumping aot-linked classes and we are able to write archived heap objects, we automatically
1065 // enable the archiving of MethodHandles. This will in turn enable the archiving of MethodTypes and hidden
1066 // classes that are used in the implementation of MethodHandles.
1067 // Archived MethodHandles are required for higher-level optimizations such as AOT resolution of invokedynamic
1068 // and dynamic proxies.
1069 bool CDSConfig::is_dumping_method_handles() {
1070 return is_initing_classes_at_dump_time();
1071 }
1072
1073 #endif // INCLUDE_CDS_JAVA_HEAP
1074
1075 // AOT code generation and its archiving is disabled by default.
1076 // We enable it only in the final image dump after the metadata and heap are dumped.
1077 // This affects only JITed code because it may have embedded oops and metadata pointers
1078 // which AOT code encodes as offsets in final CDS archive regions.
1079
1080 static bool _is_dumping_aot_code = false;
1081
1082 bool CDSConfig::is_dumping_aot_code() {
1083 return _is_dumping_aot_code;
1084 }
1085
1086 void CDSConfig::disable_dumping_aot_code() {
1087 _is_dumping_aot_code = false;
1088 }
1089
1090 void CDSConfig::enable_dumping_aot_code() {
1091 _is_dumping_aot_code = true;
1092 }
1093
1094 bool CDSConfig::is_dumping_adapters() {
1095 return (AOTAdapterCaching && is_dumping_final_static_archive());
1096 }