1 /*
2 * Copyright (c) 2023, 2024, 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/classListWriter.hpp"
29 #include "cds/heapShared.hpp"
30 #include "classfile/classLoaderDataShared.hpp"
31 #include "classfile/moduleEntry.hpp"
32 #include "include/jvm_io.h"
33 #include "logging/log.hpp"
34 #include "memory/universe.hpp"
35 #include "runtime/arguments.hpp"
36 #include "runtime/java.hpp"
37 #include "utilities/defaultStream.hpp"
38
39 bool CDSConfig::_is_dumping_static_archive = false;
40 bool CDSConfig::_is_dumping_dynamic_archive = false;
41 bool CDSConfig::_is_using_optimized_module_handling = true;
42 bool CDSConfig::_is_dumping_full_module_graph = true;
43 bool CDSConfig::_is_using_full_module_graph = true;
44
45 char* CDSConfig::_default_archive_path = nullptr;
46 char* CDSConfig::_static_archive_path = nullptr;
47 char* CDSConfig::_dynamic_archive_path = nullptr;
48
49 int CDSConfig::get_status() {
50 assert(Universe::is_fully_initialized(), "status is finalized only after Universe is initialized");
51 return (is_dumping_archive() ? IS_DUMPING_ARCHIVE : 0) |
52 (is_dumping_static_archive() ? IS_DUMPING_STATIC_ARCHIVE : 0) |
53 (is_logging_lambda_form_invokers() ? IS_LOGGING_LAMBDA_FORM_INVOKERS : 0) |
54 (is_using_archive() ? IS_USING_ARCHIVE : 0);
55 }
56
57
58 void CDSConfig::initialize() {
59 if (is_dumping_static_archive()) {
60 if (RequireSharedSpaces) {
61 warning("Cannot dump shared archive while using shared archive");
62 }
63 UseSharedSpaces = false;
64 }
65
66 // Initialize shared archive paths which could include both base and dynamic archive paths
67 // This must be after set_ergonomics_flags() called so flag UseCompressedOops is set properly.
68 //
69 // UseSharedSpaces may be disabled if -XX:SharedArchiveFile is invalid.
70 if (is_dumping_static_archive() || is_using_archive()) {
71 init_shared_archive_paths();
72 }
73
74 if (!is_dumping_heap()) {
75 _is_dumping_full_module_graph = false;
76 }
77 }
78
79 char* CDSConfig::default_archive_path() {
80 if (_default_archive_path == nullptr) {
81 char jvm_path[JVM_MAXPATHLEN];
82 os::jvm_path(jvm_path, sizeof(jvm_path));
83 char *end = strrchr(jvm_path, *os::file_separator());
84 if (end != nullptr) *end = '\0';
85 stringStream tmp;
86 tmp.print("%s%sclasses", jvm_path, os::file_separator());
87 #ifdef _LP64
88 if (!UseCompressedOops) {
89 tmp.print_raw("_nocoops");
90 }
91 if (UseCompactObjectHeaders) {
92 // Note that generation of xxx_coh.jsa variants require
93 // --enable-cds-archive-coh at build time
94 tmp.print_raw("_coh");
95 }
96 #endif
97 tmp.print_raw(".jsa");
98 _default_archive_path = os::strdup(tmp.base());
99 }
100 return _default_archive_path;
101 }
102
103 int CDSConfig::num_archives(const char* archive_path) {
104 if (archive_path == nullptr) {
105 return 0;
106 }
107 int npaths = 1;
108 char* p = (char*)archive_path;
109 while (*p != '\0') {
110 if (*p == os::path_separator()[0]) {
111 npaths++;
112 }
113 p++;
114 }
115 return npaths;
116 }
117
118 void CDSConfig::extract_shared_archive_paths(const char* archive_path,
119 char** base_archive_path,
120 char** top_archive_path) {
121 char* begin_ptr = (char*)archive_path;
122 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
123 if (end_ptr == nullptr || end_ptr == begin_ptr) {
124 vm_exit_during_initialization("Base archive was not specified", archive_path);
125 }
126 size_t len = end_ptr - begin_ptr;
127 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
128 strncpy(cur_path, begin_ptr, len);
129 cur_path[len] = '\0';
130 *base_archive_path = cur_path;
131
132 begin_ptr = ++end_ptr;
133 if (*begin_ptr == '\0') {
134 vm_exit_during_initialization("Top archive was not specified", archive_path);
135 }
136 end_ptr = strchr(begin_ptr, '\0');
137 assert(end_ptr != nullptr, "sanity");
138 len = end_ptr - begin_ptr;
139 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
140 strncpy(cur_path, begin_ptr, len + 1);
141 *top_archive_path = cur_path;
142 }
143
144 void CDSConfig::init_shared_archive_paths() {
145 if (ArchiveClassesAtExit != nullptr) {
146 assert(!RecordDynamicDumpInfo, "already checked");
147 if (is_dumping_static_archive()) {
148 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
149 }
150 check_unsupported_dumping_module_options();
151
152 if (os::same_files(default_archive_path(), ArchiveClassesAtExit)) {
153 vm_exit_during_initialization(
154 "Cannot specify the default CDS archive for -XX:ArchiveClassesAtExit", default_archive_path());
155 }
156 }
157
158 if (SharedArchiveFile == nullptr) {
159 _static_archive_path = default_archive_path();
160 } else {
161 int archives = num_archives(SharedArchiveFile);
162 assert(archives > 0, "must be");
163
164 if (is_dumping_archive() && archives > 1) {
165 vm_exit_during_initialization(
166 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
167 }
168
169 if (is_dumping_static_archive()) {
170 assert(archives == 1, "must be");
171 // Static dump is simple: only one archive is allowed in SharedArchiveFile. This file
172 // will be overwritten no matter regardless of its contents
173 _static_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
174 } else {
175 // SharedArchiveFile may specify one or two files. In case (c), the path for base.jsa
176 // is read from top.jsa
177 // (a) 1 file: -XX:SharedArchiveFile=base.jsa
178 // (b) 2 files: -XX:SharedArchiveFile=base.jsa:top.jsa
179 // (c) 2 files: -XX:SharedArchiveFile=top.jsa
180 //
181 // However, if either RecordDynamicDumpInfo or ArchiveClassesAtExit is used, we do not
182 // allow cases (b) and (c). Case (b) is already checked above.
183
184 if (archives > 2) {
185 vm_exit_during_initialization(
186 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
187 }
188 if (archives == 1) {
189 char* base_archive_path = nullptr;
190 bool success =
191 FileMapInfo::get_base_archive_name_from_header(SharedArchiveFile, &base_archive_path);
192 if (!success) {
193 // If +AutoCreateSharedArchive and the specified shared archive does not exist,
194 // regenerate the dynamic archive base on default archive.
195 if (AutoCreateSharedArchive && !os::file_exists(SharedArchiveFile)) {
196 enable_dumping_dynamic_archive();
197 ArchiveClassesAtExit = const_cast<char *>(SharedArchiveFile);
198 _static_archive_path = default_archive_path();
199 SharedArchiveFile = nullptr;
200 } else {
201 if (AutoCreateSharedArchive) {
202 warning("-XX:+AutoCreateSharedArchive is unsupported when base CDS archive is not loaded. Run with -Xlog:cds for more info.");
203 AutoCreateSharedArchive = false;
204 }
205 Arguments::no_shared_spaces("invalid archive");
206 }
207 } else if (base_archive_path == nullptr) {
208 // User has specified a single archive, which is a static archive.
209 _static_archive_path = const_cast<char *>(SharedArchiveFile);
210 } else {
211 // User has specified a single archive, which is a dynamic archive.
212 _dynamic_archive_path = const_cast<char *>(SharedArchiveFile);
213 _static_archive_path = base_archive_path; // has been c-heap allocated.
214 }
215 } else {
216 extract_shared_archive_paths((const char*)SharedArchiveFile,
217 &_static_archive_path, &_dynamic_archive_path);
218 if (_static_archive_path == nullptr) {
219 assert(_dynamic_archive_path == nullptr, "must be");
220 Arguments::no_shared_spaces("invalid archive");
221 }
222 }
223
224 if (_dynamic_archive_path != nullptr) {
225 // Check for case (c)
226 if (RecordDynamicDumpInfo) {
227 vm_exit_during_initialization("-XX:+RecordDynamicDumpInfo is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile",
228 SharedArchiveFile);
229 }
230 if (ArchiveClassesAtExit != nullptr) {
231 vm_exit_during_initialization("-XX:ArchiveClassesAtExit is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile",
232 SharedArchiveFile);
233 }
234 }
235
236 if (ArchiveClassesAtExit != nullptr && os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
237 vm_exit_during_initialization(
238 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
239 SharedArchiveFile);
240 }
241 }
242 }
243 }
244
245 void CDSConfig::check_internal_module_property(const char* key, const char* value) {
246 if (Arguments::is_internal_module_property(key)) {
247 stop_using_optimized_module_handling();
248 log_info(cds)("optimized module handling: disabled due to incompatible property: %s=%s", key, value);
249 }
250 }
251
252 void CDSConfig::check_incompatible_property(const char* key, const char* value) {
253 static const char* incompatible_properties[] = {
254 "java.system.class.loader",
255 "jdk.module.showModuleResolution",
256 "jdk.module.validation"
257 };
258
259 for (const char* property : incompatible_properties) {
260 if (strcmp(key, property) == 0) {
261 stop_dumping_full_module_graph();
262 stop_using_full_module_graph();
263 log_info(cds)("full module graph: disabled due to incompatible property: %s=%s", key, value);
264 break;
265 }
266 }
267
268 }
269
270 // Returns any JVM command-line option, such as "--patch-module", that's not supported by CDS.
271 static const char* find_any_unsupported_module_option() {
272 // Note that arguments.cpp has translated the command-line options into properties. If we find an
273 // unsupported property, translate it back to its command-line option for better error reporting.
274
275 // The following properties are checked by Arguments::is_internal_module_property() and cannot be
276 // directly specified in the command-line.
277 static const char* unsupported_module_properties[] = {
278 "jdk.module.limitmods",
279 "jdk.module.upgrade.path",
280 "jdk.module.patch.0"
281 };
282 static const char* unsupported_module_options[] = {
283 "--limit-modules",
284 "--upgrade-module-path",
285 "--patch-module"
286 };
287
288 assert(ARRAY_SIZE(unsupported_module_properties) == ARRAY_SIZE(unsupported_module_options), "must be");
289 SystemProperty* sp = Arguments::system_properties();
290 while (sp != nullptr) {
291 for (uint i = 0; i < ARRAY_SIZE(unsupported_module_properties); i++) {
292 if (strcmp(sp->key(), unsupported_module_properties[i]) == 0) {
293 return unsupported_module_options[i];
294 }
295 }
296 sp = sp->next();
297 }
298
299 return nullptr; // not found
300 }
301
302 void CDSConfig::check_unsupported_dumping_module_options() {
303 assert(is_dumping_archive(), "this function is only used with CDS dump time");
304 const char* option = find_any_unsupported_module_option();
305 if (option != nullptr) {
306 vm_exit_during_initialization("Cannot use the following option when dumping the shared archive", option);
307 }
308 // Check for an exploded module build in use with -Xshare:dump.
309 if (!Arguments::has_jimage()) {
310 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
311 }
312 }
313
314 bool CDSConfig::has_unsupported_runtime_module_options() {
315 assert(is_using_archive(), "this function is only used with -Xshare:{on,auto}");
316 if (ArchiveClassesAtExit != nullptr) {
317 // dynamic dumping, just return false for now.
318 // check_unsupported_dumping_properties() will be called later to check the same set of
319 // properties, and will exit the VM with the correct error message if the unsupported properties
320 // are used.
321 return false;
322 }
323 const char* option = find_any_unsupported_module_option();
324 if (option != nullptr) {
325 if (RequireSharedSpaces) {
326 warning("CDS is disabled when the %s option is specified.", option);
327 } else {
328 log_info(cds)("CDS is disabled when the %s option is specified.", option);
329 }
330 return true;
331 }
332 return false;
333 }
334
335 bool CDSConfig::check_vm_args_consistency(bool patch_mod_javabase, bool mode_flag_cmd_line) {
336 if (is_dumping_static_archive()) {
337 if (!mode_flag_cmd_line) {
338 // By default, -Xshare:dump runs in interpreter-only mode, which is required for deterministic archive.
339 //
340 // If your classlist is large and you don't care about deterministic dumping, you can use
341 // -Xshare:dump -Xmixed to improve dumping speed.
342 Arguments::set_mode_flags(Arguments::_int);
343 } else if (Arguments::mode() == Arguments::_comp) {
344 // -Xcomp may use excessive CPU for the test tiers. Also, -Xshare:dump runs a small and fixed set of
345 // Java code, so there's not much benefit in running -Xcomp.
346 log_info(cds)("reduced -Xcomp to -Xmixed for static dumping");
347 Arguments::set_mode_flags(Arguments::_mixed);
348 }
349
350 // String deduplication may cause CDS to iterate the strings in different order from one
351 // run to another which resulting in non-determinstic CDS archives.
352 // Disable UseStringDeduplication while dumping CDS archive.
353 UseStringDeduplication = false;
354 }
355
356 // RecordDynamicDumpInfo is not compatible with ArchiveClassesAtExit
357 if (ArchiveClassesAtExit != nullptr && RecordDynamicDumpInfo) {
358 jio_fprintf(defaultStream::output_stream(),
359 "-XX:+RecordDynamicDumpInfo cannot be used with -XX:ArchiveClassesAtExit.\n");
360 return false;
361 }
362
363 if (ArchiveClassesAtExit == nullptr && !RecordDynamicDumpInfo) {
364 disable_dumping_dynamic_archive();
365 } else {
366 enable_dumping_dynamic_archive();
367 }
368
369 if (AutoCreateSharedArchive) {
370 if (SharedArchiveFile == nullptr) {
371 log_warning(cds)("-XX:+AutoCreateSharedArchive requires -XX:SharedArchiveFile");
372 return false;
373 }
374 if (ArchiveClassesAtExit != nullptr) {
375 log_warning(cds)("-XX:+AutoCreateSharedArchive does not work with ArchiveClassesAtExit");
376 return false;
377 }
378 }
379
380 if (is_using_archive() && patch_mod_javabase) {
381 Arguments::no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
382 }
383 if (is_using_archive() && has_unsupported_runtime_module_options()) {
384 UseSharedSpaces = false;
385 }
386
387 if (is_dumping_archive()) {
388 // Always verify non-system classes during CDS dump
389 if (!BytecodeVerificationRemote) {
390 BytecodeVerificationRemote = true;
391 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
392 }
393 }
394
395 return true;
396 }
397
398 bool CDSConfig::is_using_archive() {
399 return UseSharedSpaces;
400 }
401
402 bool CDSConfig::is_logging_lambda_form_invokers() {
403 return ClassListWriter::is_enabled() || is_dumping_dynamic_archive();
404 }
405
406 void CDSConfig::stop_using_optimized_module_handling() {
407 _is_using_optimized_module_handling = false;
408 _is_dumping_full_module_graph = false; // This requires is_using_optimized_module_handling()
409 _is_using_full_module_graph = false; // This requires is_using_optimized_module_handling()
410 }
411
412 #if INCLUDE_CDS_JAVA_HEAP
413 bool CDSConfig::is_dumping_heap() {
414 // heap dump is not supported in dynamic dump
415 return is_dumping_static_archive() && HeapShared::can_write();
416 }
417
418 bool CDSConfig::is_using_full_module_graph() {
419 if (ClassLoaderDataShared::is_full_module_graph_loaded()) {
420 return true;
421 }
422
423 if (!_is_using_full_module_graph) {
424 return false;
425 }
426
427 if (is_using_archive() && ArchiveHeapLoader::can_use()) {
428 // Classes used by the archived full module graph are loaded in JVMTI early phase.
429 assert(!(JvmtiExport::should_post_class_file_load_hook() && JvmtiExport::has_early_class_hook_env()),
430 "CDS should be disabled if early class hooks are enabled");
431 return true;
432 } else {
433 _is_using_full_module_graph = false;
434 return false;
435 }
436 }
437
438 void CDSConfig::stop_dumping_full_module_graph(const char* reason) {
439 if (_is_dumping_full_module_graph) {
440 _is_dumping_full_module_graph = false;
441 if (reason != nullptr) {
442 log_info(cds)("full module graph cannot be dumped: %s", reason);
443 }
444 }
445 }
446
447 void CDSConfig::stop_using_full_module_graph(const char* reason) {
448 assert(!ClassLoaderDataShared::is_full_module_graph_loaded(), "you call this function too late!");
449 if (_is_using_full_module_graph) {
450 _is_using_full_module_graph = false;
451 if (reason != nullptr) {
452 log_info(cds)("full module graph cannot be loaded: %s", reason);
453 }
454 }
455 }
456 #endif // INCLUDE_CDS_JAVA_HEAP