1 /*
2 * Copyright (c) 2003, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/aotClassLocation.hpp"
26 #include "cds/aotLogging.hpp"
27 #include "cds/archiveBuilder.hpp"
28 #include "cds/cdsConfig.hpp"
29 #include "cds/dynamicArchive.hpp"
30 #include "cds/filemap.hpp"
31 #include "cds/metaspaceShared.hpp"
32 #include "cds/serializeClosure.hpp"
33 #include "classfile/classLoader.hpp"
34 #include "classfile/classLoaderData.hpp"
35 #include "classfile/javaClasses.hpp"
36 #include "logging/log.hpp"
37 #include "logging/logStream.hpp"
38 #include "memory/metadataFactory.hpp"
39 #include "memory/metaspaceClosure.hpp"
40 #include "memory/resourceArea.hpp"
41 #include "oops/array.hpp"
42 #include "oops/objArrayKlass.hpp"
43 #include "runtime/arguments.hpp"
44 #include "utilities/classpathStream.hpp"
45 #include "utilities/formatBuffer.hpp"
46 #include "utilities/stringUtils.hpp"
47
48 #include <sys/stat.h>
49 #include <errno.h>
50
51 Array<ClassPathZipEntry*>* AOTClassLocationConfig::_dumptime_jar_files = nullptr;
52 AOTClassLocationConfig* AOTClassLocationConfig::_dumptime_instance = nullptr;
53 const AOTClassLocationConfig* AOTClassLocationConfig::_runtime_instance = nullptr;
54
55 // A ClassLocationStream represents a list of code locations, which can be iterated using
56 // start() and has_next().
57 class ClassLocationStream {
58 protected:
59 GrowableArray<const char*> _array;
60 int _current;
61
62 // Add one path to this stream.
63 void add_one_path(const char* path) {
64 _array.append(path);
65 }
66
67 // Add all paths specified in cp; cp must be from -classpath or -Xbootclasspath/a.
68 void add_paths_in_classpath(const char* cp) {
69 ClasspathStream cp_stream(cp);
70 while (cp_stream.has_next()) {
71 add_one_path(cp_stream.get_next());
72 }
73 }
74
75 public:
76 ClassLocationStream() : _array(), _current(0) {}
77
78 void print(outputStream* st) const {
79 const char* sep = "";
80 for (int i = 0; i < _array.length(); i++) {
81 st->print("%s%s", sep, _array.at(i));
82 sep = os::path_separator();
83 }
84 }
85
86 void add(ClassLocationStream& css) {
87 for (css.start(); css.has_next();) {
88 add_one_path(css.get_next());
89 }
90 }
91
92 // Iteration
93 void start() { _current = 0; }
94 bool has_next() const { return _current < _array.length(); }
95 const char* get_next() {
96 return _array.at(_current++);
97 }
98
99 int current() const { return _current; }
100 bool is_empty() const { return _array.length() == 0; }
101 };
102
103 class BootCpClassLocationStream : public ClassLocationStream {
104 public:
105 BootCpClassLocationStream() : ClassLocationStream() {
106 // Arguments::get_boot_class_path() contains $JAVA_HOME/lib/modules, but we treat that separately
107 for (const char* bootcp = Arguments::get_boot_class_path(); *bootcp != '\0'; ++bootcp) {
108 if (*bootcp == *os::path_separator()) {
109 ++bootcp;
110 add_paths_in_classpath(bootcp);
111 break;
112 }
113 }
114 }
115 };
116
117 class AppCpClassLocationStream : public ClassLocationStream {
118 public:
119 AppCpClassLocationStream() : ClassLocationStream() {
120 const char* appcp = Arguments::get_appclasspath();
121 if (strcmp(appcp, ".") == 0) {
122 appcp = "";
123 }
124 add_paths_in_classpath(appcp);
125 }
126 };
127
128 class ModulePathClassLocationStream : public ClassLocationStream {
129 bool _has_non_jar_modules;
130 public:
131 ModulePathClassLocationStream();
132 bool has_non_jar_modules() { return _has_non_jar_modules; }
133 };
134
135 // AllClassLocationStreams is used to iterate over all the code locations that
136 // are available to the application from -Xbootclasspath, -classpath and --module-path.
137 // When creating an AOT cache, we store the contents from AllClassLocationStreams
138 // into an array of AOTClassLocations. See AOTClassLocationConfig::dumptime_init_helper().
139 // When loading the AOT cache in a production run, we compare the contents of the
140 // stored AOTClassLocations against the current AllClassLocationStreams to determine whether
141 // the AOT cache is compatible with the current JVM. See AOTClassLocationConfig::validate().
142 class AllClassLocationStreams {
143 BootCpClassLocationStream _boot_cp; // Specified by -Xbootclasspath/a
144 AppCpClassLocationStream _app_cp; // Specified by -classpath
145 ModulePathClassLocationStream _module_path; // Specified by --module-path
146 ClassLocationStream _boot_and_app_cp; // Convenience for iterating over both _boot and _app
147 public:
148 BootCpClassLocationStream& boot_cp() { return _boot_cp; }
149 AppCpClassLocationStream& app_cp() { return _app_cp; }
150 ModulePathClassLocationStream& module_path() { return _module_path; }
151 ClassLocationStream& boot_and_app_cp() { return _boot_and_app_cp; }
152
153 AllClassLocationStreams() : _boot_cp(), _app_cp(), _module_path(), _boot_and_app_cp() {
154 _boot_and_app_cp.add(_boot_cp);
155 _boot_and_app_cp.add(_app_cp);
156 }
157 };
158
159 static bool has_jar_suffix(const char* filename) {
160 // In jdk.internal.module.ModulePath.readModule(), it checks for the ".jar" suffix.
161 // Performing the same check here.
162 const char* dot = strrchr(filename, '.');
163 if (dot != nullptr && strcmp(dot + 1, "jar") == 0) {
164 return true;
165 }
166 return false;
167 }
168
169 static int compare_module_path_by_name(const char** p1, const char** p2) {
170 return strcmp(*p1, *p2);
171 }
172
173 ModulePathClassLocationStream::ModulePathClassLocationStream() : ClassLocationStream(), _has_non_jar_modules(false) {
174 // Note: for handling of --module-path, see
175 // https://openjdk.org/jeps/261#Module-paths
176 // https://docs.oracle.com/en/java/javase/23/docs/api/java.base/java/lang/module/ModuleFinder.html#of(java.nio.file.Path...)
177
178 const char* jdk_module_path = Arguments::get_property("jdk.module.path");
179 if (jdk_module_path == nullptr) {
180 return;
181 }
182
183 ClasspathStream cp_stream(jdk_module_path);
184 while (cp_stream.has_next()) {
185 const char* path = cp_stream.get_next();
186 DIR* dirp = os::opendir(path);
187 if (dirp == nullptr && errno == ENOTDIR && has_jar_suffix(path)) {
188 add_one_path(path);
189 } else if (dirp != nullptr) {
190 struct dirent* dentry;
191 bool found_jar = false;
192 while ((dentry = os::readdir(dirp)) != nullptr) {
193 const char* file_name = dentry->d_name;
194 if (has_jar_suffix(file_name)) {
195 size_t full_name_len = strlen(path) + strlen(file_name) + strlen(os::file_separator()) + 1;
196 char* full_name = NEW_RESOURCE_ARRAY(char, full_name_len);
197 int n = os::snprintf(full_name, full_name_len, "%s%s%s", path, os::file_separator(), file_name);
198 assert((size_t)n == full_name_len - 1, "Unexpected number of characters in string");
199 add_one_path(full_name);
200 found_jar = true;
201 } else if (strcmp(file_name, ".") != 0 && strcmp(file_name, "..") != 0) {
202 // Found some non jar entries
203 _has_non_jar_modules = true;
204 log_info(class, path)("Found non-jar path: '%s%s%s'", path, os::file_separator(), file_name);
205 }
206 }
207 if (!found_jar) {
208 log_info(class, path)("Found exploded module path: '%s'", path);
209 _has_non_jar_modules = true;
210 }
211 os::closedir(dirp);
212 } else {
213 _has_non_jar_modules = true;
214 }
215 }
216
217 _array.sort(compare_module_path_by_name);
218 }
219
220 AOTClassLocation* AOTClassLocation::allocate(JavaThread* current, const char* path, int index,
221 Group group, bool from_cpattr, bool is_jrt) {
222 size_t path_length = 0;
223 size_t manifest_length = 0;
224 bool check_time = false;
225 time_t timestamp = 0;
226 int64_t filesize = 0;
227 FileType type = FileType::NORMAL;
228 // Do not record the actual path of the jrt, as the entire JDK can be moved to a different
229 // directory.
230 const char* recorded_path = is_jrt ? "" : path;
231 path_length = strlen(recorded_path);
232
233 struct stat st;
234 if (os::stat(path, &st) == 0) {
235 if ((st.st_mode & S_IFMT) == S_IFDIR) {
236 type = FileType::DIR;
237 } else {
238 timestamp = st.st_mtime;
239 filesize = st.st_size;
240
241 // The timestamp of $JAVA_HOME/lib/modules is not checked at runtime.
242 check_time = !is_jrt;
243 }
244 #ifdef _WINDOWS
245 } else if (errno == ERROR_FILE_NOT_FOUND || errno == ERROR_PATH_NOT_FOUND) {
246 // On Windows, the errno could be ERROR_PATH_NOT_FOUND (3) in case the directory
247 // path doesn't exist.
248 type = FileType::NOT_EXIST;
249 #endif
250 } else if (errno == ENOENT) {
251 // We allow the file to not exist, as long as it also doesn't exist during runtime.
252 type = FileType::NOT_EXIST;
253 } else {
254 aot_log_error(aot)("Unable to open file %s.", path);
255 MetaspaceShared::unrecoverable_loading_error();
256 }
257
258 ResourceMark rm(current);
259 char* manifest = nullptr;
260
261 if (!is_jrt && type == FileType::NORMAL) {
262 manifest = read_manifest(current, path, manifest_length); // resource allocated
263 }
264
265 size_t cs_size = header_size() +
266 + path_length + 1 /* nul-terminated */
267 + manifest_length + 1; /* nul-terminated */
268
269 AOTClassLocation* cs = (AOTClassLocation*)os::malloc(cs_size, mtClassShared);
270 memset(cs, 0, cs_size);
271 cs->_path_length = path_length;
272 cs->_manifest_length = manifest_length;
273 cs->_check_time = check_time;
274 cs->_from_cpattr = from_cpattr;
275 cs->_timestamp = check_time ? timestamp : 0;
276 cs->_filesize = filesize;
277 cs->_file_type = type;
278 cs->_group = group;
279 cs->_index = index;
280
281 strcpy(((char*)cs) + cs->path_offset(), recorded_path);
282 if (manifest_length > 0) {
283 memcpy(((char*)cs) + cs->manifest_offset(), manifest, manifest_length);
284 }
285 assert(*(cs->manifest() + cs->manifest_length()) == '\0', "should be nul-terminated");
286
287 if (strstr(cs->manifest(), "Multi-Release: true") != nullptr) {
288 cs->_is_multi_release_jar = true;
289 }
290
291 if (strstr(cs->manifest(), "Extension-List:") != nullptr) {
292 vm_exit_during_cds_dumping(err_msg("-Xshare:dump does not support Extension-List in JAR manifest: %s", path));
293 }
294
295 return cs;
296 }
297
298 char* AOTClassLocation::read_manifest(JavaThread* current, const char* path, size_t& manifest_length) {
299 manifest_length = 0;
300
301 struct stat st;
302 if (os::stat(path, &st) != 0) {
303 return nullptr;
304 }
305
306 ClassPathEntry* cpe = ClassLoader::create_class_path_entry(current, path, &st);
307 if (cpe == nullptr) {
308 // <path> is a file, but not a JAR file
309 return nullptr;
310 }
311 assert(cpe->is_jar_file(), "should not be called with a directory");
312
313 const char* name = "META-INF/MANIFEST.MF";
314 char* manifest;
315 jint size;
316 manifest = (char*) ((ClassPathZipEntry*)cpe)->open_entry(current, name, &size, true);
317
318 if (manifest == nullptr || size <= 0) { // No Manifest
319 manifest_length = 0;
320 } else {
321 manifest_length = (size_t)size;
322 }
323
324 delete cpe;
325 return manifest;
326 }
327
328 // The result is resource allocated.
329 char* AOTClassLocation::get_cpattr() const {
330 if (_manifest_length == 0) {
331 return nullptr;
332 }
333
334 size_t buf_size = _manifest_length + 1;
335 char* buf = NEW_RESOURCE_ARRAY(char, buf_size);
336 memcpy(buf, manifest(), _manifest_length);
337 buf[_manifest_length] = 0; // make sure it's 0-terminated
338
339 // See http://docs.oracle.com/javase/6/docs/technotes/guides/jar/jar.html#JAR%20Manifest
340 // Replace all CR/LF and CR with LF
341 StringUtils::replace_no_expand(buf, "\r\n", "\n");
342 // Remove all new-line continuation (remove all "\n " substrings)
343 StringUtils::replace_no_expand(buf, "\n ", "");
344
345 const char* tag = "Class-Path: ";
346 size_t tag_len = strlen(tag);
347 char* found = nullptr;
348 char* line_start = buf;
349 char* end = buf + _manifest_length;
350
351 assert(*end == 0, "must be nul-terminated");
352
353 while (line_start < end) {
354 char* line_end = strchr(line_start, '\n');
355 if (line_end == nullptr) {
356 // JAR spec require the manifest file to be terminated by a new line.
357 break;
358 }
359 if (strncmp(tag, line_start, tag_len) == 0) {
360 if (found != nullptr) {
361 // Same behavior as jdk/src/share/classes/java/util/jar/Attributes.java
362 // If duplicated entries are found, the last one is used.
363 log_warning(aot)("Warning: Duplicate name in Manifest: %s.\n"
364 "Ensure that the manifest does not have duplicate entries, and\n"
365 "that blank lines separate individual sections in both your\n"
366 "manifest and in the META-INF/MANIFEST.MF entry in the jar file:\n%s\n", tag, path());
367 }
368 found = line_start + tag_len;
369 assert(found <= line_end, "sanity");
370 *line_end = '\0';
371 }
372 line_start = line_end + 1;
373 }
374
375 return found;
376 }
377
378 AOTClassLocation* AOTClassLocation::write_to_archive() const {
379 AOTClassLocation* archived_copy = (AOTClassLocation*)ArchiveBuilder::ro_region_alloc(total_size());
380 memcpy((char*)archived_copy, (char*)this, total_size());
381 return archived_copy;
382 }
383
384 const char* AOTClassLocation::file_type_string() const {
385 switch (_file_type) {
386 case FileType::NORMAL: return "file";
387 case FileType::DIR: return "dir";
388 case FileType::NOT_EXIST: default: return "not-exist";
389 }
390 }
391
392 bool AOTClassLocation::check(const char* runtime_path, bool has_aot_linked_classes) const {
393 struct stat st;
394 if (os::stat(runtime_path, &st) != 0) {
395 if (_file_type != FileType::NOT_EXIST) {
396 aot_log_warning(aot)("Required classpath entry does not exist: %s", runtime_path);
397 return false;
398 }
399 } else if ((st.st_mode & S_IFMT) == S_IFDIR) {
400 if (_file_type == FileType::NOT_EXIST) {
401 aot_log_warning(aot)("'%s' must not exist", runtime_path);
402 return false;
403 }
404 if (_file_type == FileType::NORMAL) {
405 aot_log_warning(aot)("'%s' must be a file", runtime_path);
406 return false;
407 }
408 if (!os::dir_is_empty(runtime_path)) {
409 aot_log_warning(aot)("directory is not empty: '%s'", runtime_path);
410 return false;
411 }
412 } else {
413 if (_file_type == FileType::NOT_EXIST) {
414 aot_log_warning(aot)("'%s' must not exist", runtime_path);
415 if (has_aot_linked_classes) {
416 aot_log_error(aot)("CDS archive has aot-linked classes. It cannot be used because the "
417 "file %s exists", runtime_path);
418 return false;
419 } else {
420 aot_log_warning(aot)("Archived non-system classes are disabled because the "
421 "file %s exists", runtime_path);
422 FileMapInfo::current_info()->set_has_platform_or_app_classes(false);
423 if (DynamicArchive::is_mapped()) {
424 FileMapInfo::dynamic_info()->set_has_platform_or_app_classes(false);
425 }
426 }
427 }
428 if (_file_type == FileType::DIR) {
429 aot_log_warning(aot)("'%s' must be a directory", runtime_path);
430 return false;
431 }
432 bool size_differs = _filesize != st.st_size;
433 bool time_differs = _check_time && (_timestamp != st.st_mtime);
434 if (size_differs || time_differs) {
435 aot_log_warning(aot)("This file is not the one used while building the shared archive file: '%s'%s%s",
436 runtime_path,
437 time_differs ? ", timestamp has changed" : "",
438 size_differs ? ", size has changed" : "");
439 return false;
440 }
441 }
442
443 log_info(class, path)("ok");
444 return true;
445 }
446
447 void AOTClassLocationConfig::dumptime_init(JavaThread* current) {
448 assert(CDSConfig::is_dumping_archive(), "");
449 _dumptime_instance = NEW_C_HEAP_OBJ(AOTClassLocationConfig, mtClassShared);
450 _dumptime_instance->dumptime_init_helper(current);
451 if (current->has_pending_exception()) {
452 // we can get an exception only when we run out of metaspace, but that
453 // shouldn't happen this early in bootstrap.
454 java_lang_Throwable::print(current->pending_exception(), tty);
455 vm_exit_during_initialization("AOTClassLocationConfig::dumptime_init_helper() failed unexpectedly");
456 }
457 }
458
459 void AOTClassLocationConfig::dumptime_init_helper(TRAPS) {
460 ResourceMark rm;
461 GrowableClassLocationArray tmp_array;
462 AllClassLocationStreams all_css;
463
464 AOTClassLocation* jrt = AOTClassLocation::allocate(THREAD, ClassLoader::get_jrt_entry()->name(),
465 0, Group::MODULES_IMAGE,
466 /*from_cpattr*/false, /*is_jrt*/true);
467 tmp_array.append(jrt);
468
469 parse(THREAD, tmp_array, all_css.boot_cp(), Group::BOOT_CLASSPATH, /*parse_manifest*/true);
470 _boot_classpath_end = tmp_array.length();
471
472 parse(THREAD, tmp_array, all_css.app_cp(), Group::APP_CLASSPATH, /*parse_manifest*/true);
473 _app_classpath_end = tmp_array.length();
474
475 parse(THREAD, tmp_array, all_css.module_path(), Group::MODULE_PATH, /*parse_manifest*/false);
476 _module_end = tmp_array.length();
477
478 _class_locations = MetadataFactory::new_array<AOTClassLocation*>(ClassLoaderData::the_null_class_loader_data(),
479 tmp_array.length(), CHECK);
480 for (int i = 0; i < tmp_array.length(); i++) {
481 _class_locations->at_put(i, tmp_array.at(i));
482 }
483
484 _dumptime_jar_files = MetadataFactory::new_array<ClassPathZipEntry*>(ClassLoaderData::the_null_class_loader_data(),
485 tmp_array.length(), CHECK);
486 for (int i = 1; i < tmp_array.length(); i++) {
487 ClassPathZipEntry* jar_file = ClassLoader::create_class_path_zip_entry(tmp_array.at(i)->path());
488 _dumptime_jar_files->at_put(i, jar_file); // may be null if the path is not a valid JAR file
489 }
490
491 const char* lcp = find_lcp(all_css.boot_and_app_cp(), _dumptime_lcp_len);
492 if (_dumptime_lcp_len > 0) {
493 log_info(class, path)("Longest common prefix = %s (%zu chars)", lcp, _dumptime_lcp_len);
494 os::free((void*)lcp);
495 } else {
496 assert(_dumptime_lcp_len == 0, "sanity");
497 log_info(class, path)("Longest common prefix = <none> (0 chars)");
498 }
499
500 _has_non_jar_modules = all_css.module_path().has_non_jar_modules();
501 _has_platform_classes = false;
502 _has_app_classes = false;
503 _max_used_index = 0;
504 }
505
506 // Find the longest common prefix of two paths, up to max_lcp_len.
507 // E.g. p1 = "/a/b/foo"
508 // p2 = "/a/b/bar"
509 // max_lcp_len = 3
510 // -> returns 3
511 static size_t find_lcp_of_two_paths(const char* p1, const char* p2, size_t max_lcp_len) {
512 size_t lcp_len = 0;
513 char sep = os::file_separator()[0];
514 for (size_t i = 0; ; i++) {
515 char c1 = *p1++;
516 char c2 = *p2++;
517 if (c1 == 0 || c2 == 0 || c1 != c2) {
518 break;
519 }
520 if (c1 == sep) {
521 lcp_len = i + 1;
522 assert(lcp_len <= max_lcp_len, "sanity");
523 if (lcp_len == max_lcp_len) {
524 break;
525 }
526 }
527 }
528 return lcp_len;
529 }
530
531 // cheap-allocated if lcp_len > 0
532 const char* AOTClassLocationConfig::find_lcp(ClassLocationStream& css, size_t& lcp_len) {
533 const char* first_path = nullptr;
534 char sep = os::file_separator()[0];
535
536 for (css.start(); css.has_next(); ) {
537 const char* path = css.get_next();
538 if (first_path == nullptr) {
539 first_path = path;
540 const char* p = strrchr(first_path, sep);
541 if (p == nullptr) {
542 lcp_len = 0;
543 return "";
544 } else {
545 lcp_len = p - first_path + 1;
546 }
547 } else {
548 lcp_len = find_lcp_of_two_paths(first_path, path, lcp_len);
549 if (lcp_len == 0) {
550 return "";
551 }
552 }
553 }
554
555 if (first_path != nullptr && lcp_len > 0) {
556 char* lcp = NEW_C_HEAP_ARRAY(char, lcp_len + 1, mtClassShared);
557 lcp[0] = 0;
558 strncat(lcp, first_path, lcp_len);
559 return lcp;
560 } else {
561 lcp_len = 0;
562 return "";
563 }
564 }
565
566 void AOTClassLocationConfig::parse(JavaThread* current, GrowableClassLocationArray& tmp_array,
567 ClassLocationStream& css, Group group, bool parse_manifest) {
568 for (css.start(); css.has_next(); ) {
569 add_class_location(current, tmp_array, css.get_next(), group, parse_manifest, /*from_cpattr*/false);
570 }
571 }
572
573 void AOTClassLocationConfig::add_class_location(JavaThread* current, GrowableClassLocationArray& tmp_array,
574 const char* path, Group group, bool parse_manifest, bool from_cpattr) {
575 AOTClassLocation* cs = AOTClassLocation::allocate(current, path, tmp_array.length(), group, from_cpattr);
576 tmp_array.append(cs);
577
578 if (!parse_manifest) {
579 // parse_manifest is true for -classpath and -Xbootclasspath/a, and false for --module-path.
580 return;
581 }
582
583 ResourceMark rm;
584 char* cp_attr = cs->get_cpattr(); // resource allocated
585 if (cp_attr != nullptr && strlen(cp_attr) > 0) {
586 //trace_class_path("found Class-Path: ", cp_attr); FIXME
587
588 char sep = os::file_separator()[0];
589 const char* dir_name = cs->path();
590 const char* dir_tail = strrchr(dir_name, sep);
591 #ifdef _WINDOWS
592 // On Windows, we also support forward slash as the file separator when locating entries in the classpath entry.
593 const char* dir_tail2 = strrchr(dir_name, '/');
594 if (dir_tail == nullptr) {
595 dir_tail = dir_tail2;
596 } else if (dir_tail2 != nullptr && dir_tail2 > dir_tail) {
597 dir_tail = dir_tail2;
598 }
599 #endif
600 int dir_len;
601 if (dir_tail == nullptr) {
602 dir_len = 0;
603 } else {
604 dir_len = pointer_delta_as_int(dir_tail, dir_name) + 1;
605 }
606
607 // Split the cp_attr by spaces, and add each file
608 char* file_start = cp_attr;
609 char* end = file_start + strlen(file_start);
610
611 while (file_start < end) {
612 char* file_end = strchr(file_start, ' ');
613 if (file_end != nullptr) {
614 *file_end = 0;
615 file_end += 1;
616 } else {
617 file_end = end;
618 }
619
620 size_t name_len = strlen(file_start);
621 if (name_len > 0) {
622 ResourceMark rm(current);
623 size_t libname_len = dir_len + name_len;
624 char* libname = NEW_RESOURCE_ARRAY(char, libname_len + 1);
625 int n = os::snprintf(libname, libname_len + 1, "%.*s%s", dir_len, dir_name, file_start);
626 assert((size_t)n == libname_len, "Unexpected number of characters in string");
627
628 // Avoid infinite recursion when two JAR files refer to each
629 // other via cpattr.
630 bool found_duplicate = false;
631 for (int i = boot_cp_start_index(); i < tmp_array.length(); i++) {
632 if (strcmp(tmp_array.at(i)->path(), libname) == 0) {
633 found_duplicate = true;
634 break;
635 }
636 }
637 if (!found_duplicate) {
638 add_class_location(current, tmp_array, libname, group, parse_manifest, /*from_cpattr*/true);
639 }
640 }
641
642 file_start = file_end;
643 }
644 }
645 }
646
647 AOTClassLocation const* AOTClassLocationConfig::class_location_at(int index) const {
648 return _class_locations->at(index);
649 }
650
651 int AOTClassLocationConfig::get_module_shared_path_index(Symbol* location) const {
652 if (location == nullptr) {
653 return 0; // Used by java/lang/reflect/Proxy$ProxyBuilder
654 }
655
656 if (location->starts_with("jrt:", 4)) {
657 assert(class_location_at(0)->is_modules_image(), "sanity");
658 return 0;
659 }
660
661 if (num_module_paths() == 0) {
662 // The archive(s) were created without --module-path option
663 return -1;
664 }
665
666 if (!location->starts_with("file:", 5)) {
667 return -1;
668 }
669
670 // skip_uri_protocol was also called during dump time -- see ClassLoaderExt::process_module_table()
671 ResourceMark rm;
672 const char* file = ClassLoader::uri_to_path(location->as_C_string());
673 for (int i = module_path_start_index(); i < module_path_end_index(); i++) {
674 const AOTClassLocation* cs = class_location_at(i);
675 assert(!cs->has_unnamed_module(), "must be");
676 bool same = os::same_files(file, cs->path());
677 log_debug(class, path)("get_module_shared_path_index (%d) %s : %s = %s", i,
678 location->as_C_string(), cs->path(), same ? "same" : "different");
679 if (same) {
680 return i;
681 }
682 }
683 return -1;
684 }
685
686 // We allow non-empty dirs as long as no classes have been loaded from them.
687 void AOTClassLocationConfig::check_nonempty_dirs() const {
688 assert(CDSConfig::is_dumping_archive(), "sanity");
689
690 bool has_nonempty_dir = false;
691 dumptime_iterate([&](AOTClassLocation* cs) {
692 if (cs->index() > _max_used_index) {
693 return false; // stop iterating
694 }
695 if (cs->is_dir()) {
696 if (!os::dir_is_empty(cs->path())) {
697 aot_log_error(aot)("Error: non-empty directory '%s'", cs->path());
698 has_nonempty_dir = true;
699 }
700 }
701 return true; // keep iterating
702 });
703
704 if (has_nonempty_dir) {
705 vm_exit_during_cds_dumping("Cannot have non-empty directory in paths", nullptr);
706 }
707 }
708
709 // It's possible to use reflection+setAccessible to call into ClassLoader::defineClass() to
710 // pretend that a dynamically generated class comes from a JAR file in the classpath.
711 // Detect such classes so that they can be excluded from the archive.
712 bool AOTClassLocationConfig::is_valid_classpath_index(int classpath_index, InstanceKlass* ik) {
713 if (1 <= classpath_index && classpath_index < length()) {
714 ClassPathZipEntry *zip = _dumptime_jar_files->at(classpath_index);
715 if (zip != nullptr) {
716 JavaThread* current = JavaThread::current();
717 ResourceMark rm(current);
718 const char* const class_name = ik->name()->as_C_string();
719 const char* const file_name = ClassLoader::file_name_for_class_name(class_name,
720 ik->name()->utf8_length());
721 if (!zip->has_entry(current, file_name)) {
722 aot_log_warning(aot)("class %s cannot be archived because it was not defined from %s as claimed",
723 class_name, zip->name());
724 return false;
725 }
726 }
727 }
728
729 return true;
730 }
731
732 AOTClassLocationConfig* AOTClassLocationConfig::write_to_archive() const {
733 Array<AOTClassLocation*>* archived_copy = ArchiveBuilder::new_ro_array<AOTClassLocation*>(_class_locations->length());
734 for (int i = 0; i < _class_locations->length(); i++) {
735 archived_copy->at_put(i, _class_locations->at(i)->write_to_archive());
736 ArchivePtrMarker::mark_pointer((address*)archived_copy->adr_at(i));
737 }
738
739 AOTClassLocationConfig* dumped = (AOTClassLocationConfig*)ArchiveBuilder::ro_region_alloc(sizeof(AOTClassLocationConfig));
740 memcpy(dumped, this, sizeof(AOTClassLocationConfig));
741 dumped->_class_locations = archived_copy;
742 ArchivePtrMarker::mark_pointer(&dumped->_class_locations);
743
744 return dumped;
745 }
746
747 bool AOTClassLocationConfig::check_classpaths(bool is_boot_classpath, bool has_aot_linked_classes,
748 int index_start, int index_end,
749 ClassLocationStream& runtime_css,
750 bool use_lcp_match, const char* runtime_lcp,
751 size_t runtime_lcp_len) const {
752 if (index_start >= index_end && runtime_css.is_empty()) { // nothing to check
753 return true;
754 }
755
756 ResourceMark rm;
757 const char* which = is_boot_classpath ? "boot" : "app";
758 LogTarget(Info, class, path) lt;
759 if (lt.is_enabled()) {
760 LogStream ls(lt);
761 ls.print("Checking %s classpath", which);
762 ls.print_cr("%s", use_lcp_match ? " (with longest common prefix substitution)" : "");
763 ls.print("- expected : '");
764 print_dumptime_classpath(ls, index_start, index_end, use_lcp_match, _dumptime_lcp_len, runtime_lcp, runtime_lcp_len);
765 ls.print_cr("'");
766 ls.print("- actual : '");
767 runtime_css.print(&ls);
768 ls.print_cr("'");
769 }
770
771 runtime_css.start();
772 for (int i = index_start; i < index_end; i++) {
773 ResourceMark rm;
774 const AOTClassLocation* cs = class_location_at(i);
775 const char* effective_dumptime_path = cs->path();
776 if (use_lcp_match && _dumptime_lcp_len > 0) {
777 effective_dumptime_path = substitute(effective_dumptime_path, _dumptime_lcp_len, runtime_lcp, runtime_lcp_len);
778 }
779
780 log_info(class, path)("Checking '%s' %s%s", effective_dumptime_path, cs->file_type_string(),
781 cs->from_cpattr() ? " (from JAR manifest ClassPath attribute)" : "");
782 if (!cs->from_cpattr() && file_exists(effective_dumptime_path)) {
783 if (!runtime_css.has_next()) {
784 aot_log_warning(aot)("%s classpath has fewer elements than expected", which);
785 return false;
786 }
787 const char* runtime_path = runtime_css.get_next();
788 while (!file_exists(runtime_path) && runtime_css.has_next()) {
789 runtime_path = runtime_css.get_next();
790 }
791 if (!os::same_files(effective_dumptime_path, runtime_path)) {
792 aot_log_warning(aot)("The name of %s classpath [%d] does not match: expected '%s', got '%s'",
793 which, runtime_css.current(), effective_dumptime_path, runtime_path);
794 return false;
795 }
796 }
797
798 if (!cs->check(effective_dumptime_path, has_aot_linked_classes)) {
799 return false;
800 }
801 }
802
803 // Check if the runtime boot classpath has more entries than the one stored in the archive and if the app classpath
804 // or the module path requires validation.
805 if (is_boot_classpath && runtime_css.has_next() && (need_to_check_app_classpath() || num_module_paths() > 0)) {
806 // the check passes if all the extra runtime boot classpath entries are non-existent
807 if (check_paths_existence(runtime_css)) {
808 aot_log_warning(aot)("boot classpath is longer than expected");
809 return false;
810 }
811 }
812
813 return true;
814 }
815
816 bool AOTClassLocationConfig::file_exists(const char* filename) const{
817 struct stat st;
818 return (os::stat(filename, &st) == 0 && st.st_size > 0);
819 }
820
821 bool AOTClassLocationConfig::check_paths_existence(ClassLocationStream& runtime_css) const {
822 bool exist = false;
823 while (runtime_css.has_next()) {
824 const char* path = runtime_css.get_next();
825 if (file_exists(path)) {
826 exist = true;
827 break;
828 }
829 }
830 return exist;
831 }
832
833 bool AOTClassLocationConfig::check_module_paths(bool has_aot_linked_classes, int index_start, int index_end,
834 ClassLocationStream& runtime_css,
835 bool* has_extra_module_paths) const {
836 if (index_start >= index_end && runtime_css.is_empty()) { // nothing to check
837 return true;
838 }
839
840 ResourceMark rm;
841
842 LogTarget(Info, class, path) lt;
843 if (lt.is_enabled()) {
844 LogStream ls(lt);
845 ls.print_cr("Checking module paths");
846 ls.print("- expected : '");
847 print_dumptime_classpath(ls, index_start, index_end, false, 0, nullptr, 0);
848 ls.print_cr("'");
849 ls.print("- actual : '");
850 runtime_css.print(&ls);
851 ls.print_cr("'");
852 }
853
854 // Make sure all the dumptime module paths exist and are unchanged
855 for (int i = index_start; i < index_end; i++) {
856 const AOTClassLocation* cs = class_location_at(i);
857 const char* dumptime_path = cs->path();
858
859 assert(!cs->from_cpattr(), "not applicable for module path");
860 log_info(class, path)("Checking '%s' %s", dumptime_path, cs->file_type_string());
861
862 if (!cs->check(dumptime_path, has_aot_linked_classes)) {
863 return false;
864 }
865 }
866
867 // We allow runtime_css to be a superset of the module paths specified in dumptime. E.g.,
868 // Dumptime: A:C
869 // Runtime: A:B:C
870 runtime_css.start();
871 for (int i = index_start; i < index_end; i++) {
872 const AOTClassLocation* cs = class_location_at(i);
873 const char* dumptime_path = cs->path();
874
875 while (true) {
876 if (!runtime_css.has_next()) {
877 aot_log_warning(aot)("module path has fewer elements than expected");
878 *has_extra_module_paths = true;
879 return true;
880 }
881 // Both this->class_locations() and runtime_css are alphabetically sorted. Skip
882 // items in runtime_css until we see dumptime_path.
883 const char* runtime_path = runtime_css.get_next();
884 if (!os::same_files(dumptime_path, runtime_path)) {
885 *has_extra_module_paths = true;
886 return true;
887 } else {
888 break;
889 }
890 }
891 }
892
893 if (runtime_css.has_next()) {
894 *has_extra_module_paths = true;
895 }
896
897 return true;
898 }
899
900 void AOTClassLocationConfig::print_dumptime_classpath(LogStream& ls, int index_start, int index_end,
901 bool do_substitute, size_t remove_prefix_len,
902 const char* prepend, size_t prepend_len) const {
903 const char* sep = "";
904 for (int i = index_start; i < index_end; i++) {
905 ResourceMark rm;
906 const AOTClassLocation* cs = class_location_at(i);
907 const char* path = cs->path();
908 if (!cs->from_cpattr()) {
909 ls.print("%s", sep);
910 if (do_substitute) {
911 path = substitute(path, remove_prefix_len, prepend, prepend_len);
912 }
913 ls.print("%s", path);
914 sep = os::path_separator();
915 }
916 }
917 }
918
919 // Returned path is resource-allocated
920 const char* AOTClassLocationConfig::substitute(const char* path, // start with this path (which was recorded from dump time)
921 size_t remove_prefix_len, // remove this number of chars from the beginning
922 const char* prepend, // prepend this string
923 size_t prepend_len) { // length of the prepended string
924 size_t len = strlen(path);
925 assert(len > remove_prefix_len, "sanity");
926 assert(prepend_len == strlen(prepend), "sanity");
927 len -= remove_prefix_len;
928 len += prepend_len;
929
930 char* buf = NEW_RESOURCE_ARRAY(char, len + 1);
931 int n = os::snprintf(buf, len + 1, "%s%s", prepend, path + remove_prefix_len);
932 assert(size_t(n) == len, "sanity");
933
934 return buf;
935 }
936
937 // For performance, we avoid using LCP match if there's at least one
938 // AOTClassLocation can be matched exactly: this means all other AOTClassLocations must be
939 // matched exactly.
940 bool AOTClassLocationConfig::need_lcp_match(AllClassLocationStreams& all_css) const {
941 if (app_cp_end_index() == boot_cp_start_index()) {
942 // No need to use lcp-match when there are no boot/app paths.
943 // TODO: LCP-match not yet supported for modules.
944 return false;
945 }
946
947 if (need_lcp_match_helper(boot_cp_start_index(), boot_cp_end_index(), all_css.boot_cp()) &&
948 need_lcp_match_helper(app_cp_start_index(), app_cp_end_index(), all_css.app_cp())) {
949 return true;
950 } else {
951 return false;
952 }
953 }
954
955 bool AOTClassLocationConfig::need_lcp_match_helper(int start, int end, ClassLocationStream& css) const {
956 int i = start;
957 for (css.start(); i < end && css.has_next(); ) {
958 const AOTClassLocation* cs = class_location_at(i++);
959 const char* runtime_path = css.get_next();
960 if (cs->must_exist() && os::same_files(cs->path(), runtime_path)) {
961 // Most likely, we will come to here at the first iteration.
962 return false;
963 }
964 }
965 return true;
966 }
967
968 bool AOTClassLocationConfig::validate(bool has_aot_linked_classes, bool* has_extra_module_paths) const {
969 ResourceMark rm;
970 AllClassLocationStreams all_css;
971
972 const char* jrt = ClassLoader::get_jrt_entry()->name();
973 bool success = class_location_at(0)->check(jrt, has_aot_linked_classes);
974 log_info(class, path)("Modules image %s validation: %s", jrt, success ? "passed" : "failed");
975 if (!success) {
976 return false;
977 }
978 if (class_locations()->length() == 1) {
979 if ((module_path_start_index() >= module_path_end_index()) && Arguments::get_property("jdk.module.path") != nullptr) {
980 *has_extra_module_paths = true;
981 } else {
982 *has_extra_module_paths = false;
983 }
984 } else {
985 bool use_lcp_match = need_lcp_match(all_css);
986 const char* runtime_lcp;
987 size_t runtime_lcp_len;
988
989 log_info(class, path)("Longest common prefix substitution in boot/app classpath matching: %s",
990 use_lcp_match ? "yes" : "no");
991 if (use_lcp_match) {
992 runtime_lcp = find_lcp(all_css.boot_and_app_cp(), runtime_lcp_len);
993 log_info(class, path)("Longest common prefix: %s (%zu chars)", runtime_lcp, runtime_lcp_len);
994 } else {
995 runtime_lcp = nullptr;
996 runtime_lcp_len = 0;
997 }
998
999 success = check_classpaths(true, has_aot_linked_classes, boot_cp_start_index(), boot_cp_end_index(), all_css.boot_cp(),
1000 use_lcp_match, runtime_lcp, runtime_lcp_len);
1001 log_info(class, path)("Archived boot classpath validation: %s", success ? "passed" : "failed");
1002
1003 if (success && need_to_check_app_classpath()) {
1004 success = check_classpaths(false, has_aot_linked_classes, app_cp_start_index(), app_cp_end_index(), all_css.app_cp(),
1005 use_lcp_match, runtime_lcp, runtime_lcp_len);
1006 log_info(class, path)("Archived app classpath validation: %s", success ? "passed" : "failed");
1007 }
1008
1009 if (success) {
1010 success = check_module_paths(has_aot_linked_classes, module_path_start_index(), module_path_end_index(),
1011 all_css.module_path(), has_extra_module_paths);
1012 log_info(class, path)("Archived module path validation: %s%s", success ? "passed" : "failed",
1013 (*has_extra_module_paths) ? " (extra module paths found)" : "");
1014 }
1015
1016 if (runtime_lcp_len > 0) {
1017 os::free((void*)runtime_lcp);
1018 }
1019 }
1020
1021 if (success) {
1022 _runtime_instance = this;
1023 } else {
1024 const char* mismatch_msg = "shared class paths mismatch";
1025 const char* hint_msg = log_is_enabled(Info, class, path) ?
1026 "" : " (hint: enable -Xlog:class+path=info to diagnose the failure)";
1027 if (RequireSharedSpaces && !PrintSharedArchiveAndExit) {
1028 if (CDSConfig::is_dumping_final_static_archive()) {
1029 aot_log_error(aot)("class path and/or module path are not compatible with the "
1030 "ones specified when the AOTConfiguration file was recorded%s", hint_msg);
1031 vm_exit_during_initialization("Unable to use create AOT cache.", nullptr);
1032 } else {
1033 aot_log_error(aot)("%s%s", mismatch_msg, hint_msg);
1034 MetaspaceShared::unrecoverable_loading_error();
1035 }
1036 } else {
1037 MetaspaceShared::report_loading_error("%s%s", mismatch_msg, hint_msg);
1038 }
1039 }
1040 return success;
1041 }
1042
1043 void AOTClassLocationConfig::print() {
1044 if (CDSConfig::is_dumping_archive()) {
1045 tty->print_cr("AOTClassLocationConfig::_dumptime_instance = %p", _dumptime_instance);
1046 if (_dumptime_instance != nullptr) {
1047 _dumptime_instance->print_on(tty);
1048 }
1049 }
1050 if (CDSConfig::is_using_archive()) {
1051 tty->print_cr("AOTClassLocationConfig::_runtime_instance = %p", _runtime_instance);
1052 if (_runtime_instance != nullptr) {
1053 _runtime_instance->print_on(tty);
1054 }
1055 }
1056 }
1057
1058 void AOTClassLocationConfig::print_on(outputStream* st) const {
1059 int n = class_locations()->length();
1060 for (int i = 0; i < n; i++) {
1061 const AOTClassLocation* cs = class_location_at(i);
1062 const char* path;
1063 if (i == 0) {
1064 path = ClassLoader::get_jrt_entry()->name();
1065 } else {
1066 path = cs->path();
1067 }
1068 st->print_cr("[%d] = %s", i, path);
1069 if (i == boot_cp_end_index() && i < n) {
1070 st->print_cr("--- end of boot");
1071 }
1072 if (i == app_cp_end_index() && i < n) {
1073 st->print_cr("--- end of app");
1074 }
1075 }
1076 }