1 /*
2 * Copyright (c) 1997, 2019, 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 "jvm.h"
27 #include "jimage.hpp"
28 #include "classfile/classFileStream.hpp"
29 #include "classfile/classLoader.inline.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/classLoaderExt.hpp"
32 #include "classfile/javaClasses.hpp"
33 #include "classfile/moduleEntry.hpp"
34 #include "classfile/modules.hpp"
35 #include "classfile/packageEntry.hpp"
36 #include "classfile/klassFactory.hpp"
37 #include "classfile/symbolTable.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/systemDictionaryShared.hpp"
40 #include "classfile/vmSymbols.hpp"
41 #include "compiler/compileBroker.hpp"
42 #include "interpreter/bytecodeStream.hpp"
43 #include "interpreter/oopMapCache.hpp"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "logging/logTag.hpp"
47 #include "memory/allocation.inline.hpp"
48 #include "memory/filemap.hpp"
49 #include "memory/oopFactory.hpp"
50 #include "memory/resourceArea.hpp"
51 #include "memory/universe.hpp"
52 #include "oops/instanceKlass.hpp"
53 #include "oops/instanceRefKlass.hpp"
54 #include "oops/method.inline.hpp"
55 #include "oops/objArrayOop.inline.hpp"
56 #include "oops/oop.inline.hpp"
57 #include "oops/symbol.hpp"
58 #include "prims/jvm_misc.hpp"
59 #include "runtime/arguments.hpp"
60 #include "runtime/compilationPolicy.hpp"
61 #include "runtime/handles.inline.hpp"
62 #include "runtime/init.hpp"
63 #include "runtime/interfaceSupport.inline.hpp"
64 #include "runtime/java.hpp"
65 #include "runtime/javaCalls.hpp"
66 #include "runtime/os.inline.hpp"
67 #include "runtime/threadCritical.hpp"
68 #include "runtime/timer.hpp"
69 #include "runtime/vm_version.hpp"
70 #include "services/management.hpp"
71 #include "services/threadService.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/hashtable.inline.hpp"
74 #include "utilities/macros.hpp"
75
76 // Entry points in zip.dll for loading zip/jar file entries
77
78 typedef void * * (*ZipOpen_t)(const char *name, char **pmsg);
79 typedef void (*ZipClose_t)(jzfile *zip);
80 typedef jzentry* (*FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
81 typedef jboolean (*ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
82 typedef jzentry* (*GetNextEntry_t)(jzfile *zip, jint n);
83 typedef jboolean (*ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg);
84 typedef jint (*Crc32_t)(jint crc, const jbyte *buf, jint len);
85
86 static ZipOpen_t ZipOpen = NULL;
87 static ZipClose_t ZipClose = NULL;
88 static FindEntry_t FindEntry = NULL;
89 static ReadEntry_t ReadEntry = NULL;
90 static GetNextEntry_t GetNextEntry = NULL;
91 static canonicalize_fn_t CanonicalizeEntry = NULL;
92 static ZipInflateFully_t ZipInflateFully = NULL;
93 static Crc32_t Crc32 = NULL;
94
95 // Entry points for jimage.dll for loading jimage file entries
96
97 static JImageOpen_t JImageOpen = NULL;
98 static JImageClose_t JImageClose = NULL;
99 static JImagePackageToModule_t JImagePackageToModule = NULL;
100 static JImageFindResource_t JImageFindResource = NULL;
101 static JImageGetResource_t JImageGetResource = NULL;
102 static JImageResourceIterator_t JImageResourceIterator = NULL;
103
104 // Globals
105
106 PerfCounter* ClassLoader::_perf_accumulated_time = NULL;
107 PerfCounter* ClassLoader::_perf_classes_inited = NULL;
108 PerfCounter* ClassLoader::_perf_class_init_time = NULL;
109 PerfCounter* ClassLoader::_perf_class_init_selftime = NULL;
110 PerfCounter* ClassLoader::_perf_classes_verified = NULL;
111 PerfCounter* ClassLoader::_perf_class_verify_time = NULL;
112 PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL;
113 PerfCounter* ClassLoader::_perf_classes_linked = NULL;
114 PerfCounter* ClassLoader::_perf_class_link_time = NULL;
115 PerfCounter* ClassLoader::_perf_class_link_selftime = NULL;
116 PerfCounter* ClassLoader::_perf_class_parse_time = NULL;
117 PerfCounter* ClassLoader::_perf_class_parse_selftime = NULL;
118 PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL;
119 PerfCounter* ClassLoader::_perf_shared_classload_time = NULL;
120 PerfCounter* ClassLoader::_perf_sys_classload_time = NULL;
121 PerfCounter* ClassLoader::_perf_app_classload_time = NULL;
122 PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL;
123 PerfCounter* ClassLoader::_perf_app_classload_count = NULL;
124 PerfCounter* ClassLoader::_perf_define_appclasses = NULL;
125 PerfCounter* ClassLoader::_perf_define_appclass_time = NULL;
126 PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL;
127 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL;
128 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL;
129 PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
130 PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
131 PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
132 PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
133 PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
134 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL;
135
136 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = NULL;
137 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = NULL;
138 ClassPathEntry* ClassLoader::_jrt_entry = NULL;
139 ClassPathEntry* ClassLoader::_first_append_entry = NULL;
140 ClassPathEntry* ClassLoader::_last_append_entry = NULL;
141 #if INCLUDE_CDS
142 ClassPathEntry* ClassLoader::_app_classpath_entries = NULL;
143 ClassPathEntry* ClassLoader::_last_app_classpath_entry = NULL;
144 ClassPathEntry* ClassLoader::_module_path_entries = NULL;
145 ClassPathEntry* ClassLoader::_last_module_path_entry = NULL;
146 #endif
147
148 // helper routines
149 bool string_starts_with(const char* str, const char* str_to_find) {
150 size_t str_len = strlen(str);
151 size_t str_to_find_len = strlen(str_to_find);
152 if (str_to_find_len > str_len) {
153 return false;
154 }
155 return (strncmp(str, str_to_find, str_to_find_len) == 0);
156 }
157
158 static const char* get_jimage_version_string() {
159 static char version_string[10] = "";
160 if (version_string[0] == '\0') {
161 jio_snprintf(version_string, sizeof(version_string), "%d.%d",
162 VM_Version::vm_major_version(), VM_Version::vm_minor_version());
163 }
164 return (const char*)version_string;
165 }
166
167 class ClasspathStream : public StackObj {
168 const char* _class_path;
169 int _len;
170 int _start;
171 int _end;
172
173 public:
174 ClasspathStream(const char* class_path) {
175 _class_path = class_path;
176 _len = (int)strlen(class_path);
177 _start = 0;
178 _end = 0;
179 }
180
181 bool has_next() {
182 return _start < _len;
183 }
184
185 const char* get_next() {
186 while (_class_path[_end] != '\0' && _class_path[_end] != os::path_separator()[0]) {
187 _end++;
188 }
189 int path_len = _end - _start;
190 char* path = NEW_RESOURCE_ARRAY(char, path_len + 1);
191 strncpy(path, &_class_path[_start], path_len);
192 path[path_len] = '\0';
193
194 while (_class_path[_end] == os::path_separator()[0]) {
195 _end++;
196 }
197 _start = _end;
198 return path;
199 }
200 };
201
202 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) {
203 size_t str_len = strlen(str);
204 size_t str_to_find_len = strlen(str_to_find);
205 if (str_to_find_len > str_len) {
206 return false;
207 }
208 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
209 }
210
211 // Used to obtain the package name from a fully qualified class name.
212 // It is the responsibility of the caller to establish a ResourceMark.
213 const char* ClassLoader::package_from_name(const char* const class_name, bool* bad_class_name) {
214 if (class_name == NULL) {
215 if (bad_class_name != NULL) {
216 *bad_class_name = true;
217 }
218 return NULL;
219 }
220
221 if (bad_class_name != NULL) {
222 *bad_class_name = false;
223 }
224
225 const char* const last_slash = strrchr(class_name, '/');
226 if (last_slash == NULL) {
227 // No package name
228 return NULL;
229 }
230
231 char* class_name_ptr = (char*) class_name;
232 // Skip over '['s
233 if (*class_name_ptr == '[') {
234 do {
235 class_name_ptr++;
236 } while (*class_name_ptr == '[');
237
238 // Fully qualified class names should not contain a 'L'.
239 // Set bad_class_name to true to indicate that the package name
240 // could not be obtained due to an error condition.
241 // In this situation, is_same_class_package returns false.
242 if (*class_name_ptr == 'L') {
243 if (bad_class_name != NULL) {
244 *bad_class_name = true;
245 }
246 return NULL;
247 }
248 }
249
250 int length = last_slash - class_name_ptr;
251
252 // A class name could have just the slash character in the name.
253 if (length <= 0) {
254 // No package name
255 if (bad_class_name != NULL) {
256 *bad_class_name = true;
257 }
258 return NULL;
259 }
260
261 // drop name after last slash (including slash)
262 // Ex., "java/lang/String.class" => "java/lang"
263 char* pkg_name = NEW_RESOURCE_ARRAY(char, length + 1);
264 strncpy(pkg_name, class_name_ptr, length);
265 *(pkg_name+length) = '\0';
266
267 return (const char *)pkg_name;
268 }
269
270 // Given a fully qualified class name, find its defining package in the class loader's
271 // package entry table.
272 PackageEntry* ClassLoader::get_package_entry(const char* class_name, ClassLoaderData* loader_data, TRAPS) {
273 ResourceMark rm(THREAD);
274 const char *pkg_name = ClassLoader::package_from_name(class_name);
275 if (pkg_name == NULL) {
276 return NULL;
277 }
278 PackageEntryTable* pkgEntryTable = loader_data->packages();
279 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(pkg_name);
280 return pkgEntryTable->lookup_only(pkg_symbol);
281 }
282
283 const char* ClassPathEntry::copy_path(const char* path) {
284 char* copy = NEW_C_HEAP_ARRAY(char, strlen(path)+1, mtClass);
285 strcpy(copy, path);
286 return copy;
287 }
288
289 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
290 // construct full path name
291 assert((_dir != NULL) && (name != NULL), "sanity");
292 size_t path_len = strlen(_dir) + strlen(name) + strlen(os::file_separator()) + 1;
293 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, path_len);
294 int len = jio_snprintf(path, path_len, "%s%s%s", _dir, os::file_separator(), name);
295 assert(len == (int)(path_len - 1), "sanity");
296 // check if file exists
297 struct stat st;
298 if (os::stat(path, &st) == 0) {
299 // found file, open it
300 int file_handle = os::open(path, 0, 0);
301 if (file_handle != -1) {
302 // read contents into resource array
303 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
304 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
305 // close file
306 os::close(file_handle);
307 // construct ClassFileStream
308 if (num_read == (size_t)st.st_size) {
309 if (UsePerfData) {
310 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
311 }
312 FREE_RESOURCE_ARRAY(char, path, path_len);
313 // Resource allocated
314 return new ClassFileStream(buffer,
315 st.st_size,
316 _dir,
317 ClassFileStream::verify);
318 }
319 }
320 }
321 FREE_RESOURCE_ARRAY(char, path, path_len);
322 return NULL;
323 }
324
325 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name,
326 bool is_boot_append, bool from_class_path_attr) : ClassPathEntry() {
327 _zip = zip;
328 _zip_name = copy_path(zip_name);
329 _from_class_path_attr = from_class_path_attr;
330 }
331
332 ClassPathZipEntry::~ClassPathZipEntry() {
333 if (ZipClose != NULL) {
334 (*ZipClose)(_zip);
335 }
336 FREE_C_HEAP_ARRAY(char, _zip_name);
337 }
338
339 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
340 // enable call to C land
341 JavaThread* thread = JavaThread::current();
342 ThreadToNativeFromVM ttn(thread);
343 // check whether zip archive contains name
344 jint name_len;
345 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
346 if (entry == NULL) return NULL;
347 u1* buffer;
348 char name_buf[128];
349 char* filename;
350 if (name_len < 128) {
351 filename = name_buf;
352 } else {
353 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
354 }
355
356 // read contents into resource array
357 int size = (*filesize) + ((nul_terminate) ? 1 : 0);
358 buffer = NEW_RESOURCE_ARRAY(u1, size);
359 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
360
361 // return result
362 if (nul_terminate) {
363 buffer[*filesize] = 0;
364 }
365 return buffer;
366 }
367
368 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
369 jint filesize;
370 u1* buffer = open_entry(name, &filesize, false, CHECK_NULL);
371 if (buffer == NULL) {
372 return NULL;
373 }
374 if (UsePerfData) {
375 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
376 }
377 // Resource allocated
378 return new ClassFileStream(buffer,
379 filesize,
380 _zip_name,
381 ClassFileStream::verify);
382 }
383
384 // invoke function for each entry in the zip file
385 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
386 JavaThread* thread = JavaThread::current();
387 HandleMark handle_mark(thread);
388 ThreadToNativeFromVM ttn(thread);
389 for (int n = 0; ; n++) {
390 jzentry * ze = ((*GetNextEntry)(_zip, n));
391 if (ze == NULL) break;
392 (*f)(ze->name, context);
393 }
394 }
395
396 DEBUG_ONLY(ClassPathImageEntry* ClassPathImageEntry::_singleton = NULL;)
397
398 void ClassPathImageEntry::close_jimage() {
399 if (_jimage != NULL) {
400 (*JImageClose)(_jimage);
401 _jimage = NULL;
402 }
403 }
404
405 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
406 ClassPathEntry(),
407 _jimage(jimage) {
408 guarantee(jimage != NULL, "jimage file is null");
409 guarantee(name != NULL, "jimage file name is null");
410 assert(_singleton == NULL, "VM supports only one jimage");
411 DEBUG_ONLY(_singleton = this);
412 size_t len = strlen(name) + 1;
413 _name = copy_path(name);
414 }
415
416 ClassPathImageEntry::~ClassPathImageEntry() {
417 assert(_singleton == this, "must be");
418 DEBUG_ONLY(_singleton = NULL);
419
420 if (_name != NULL) {
421 FREE_C_HEAP_ARRAY(const char, _name);
422 _name = NULL;
423 }
424 if (_jimage != NULL) {
425 (*JImageClose)(_jimage);
426 _jimage = NULL;
427 }
428 }
429
430 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
431 return open_stream_for_loader(name, ClassLoaderData::the_null_class_loader_data(), THREAD);
432 }
433
434 // For a class in a named module, look it up in the jimage file using this syntax:
435 // /<module-name>/<package-name>/<base-class>
436 //
437 // Assumptions:
438 // 1. There are no unnamed modules in the jimage file.
439 // 2. A package is in at most one module in the jimage file.
440 //
441 ClassFileStream* ClassPathImageEntry::open_stream_for_loader(const char* name, ClassLoaderData* loader_data, TRAPS) {
442 jlong size;
443 JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size);
444
445 if (location == 0) {
446 ResourceMark rm;
447 const char* pkg_name = ClassLoader::package_from_name(name);
448
449 if (pkg_name != NULL) {
450 if (!Universe::is_module_initialized()) {
451 location = (*JImageFindResource)(_jimage, JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
452 } else {
453 PackageEntry* package_entry = ClassLoader::get_package_entry(name, loader_data, CHECK_NULL);
454 if (package_entry != NULL) {
455 ResourceMark rm;
456 // Get the module name
457 ModuleEntry* module = package_entry->module();
458 assert(module != NULL, "Boot classLoader package missing module");
459 assert(module->is_named(), "Boot classLoader package is in unnamed module");
460 const char* module_name = module->name()->as_C_string();
461 if (module_name != NULL) {
462 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
463 }
464 }
465 }
466 }
467 }
468 if (location != 0) {
469 if (UsePerfData) {
470 ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
471 }
472 char* data = NEW_RESOURCE_ARRAY(char, size);
473 (*JImageGetResource)(_jimage, location, data, size);
474 // Resource allocated
475 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be");
476 return new ClassFileStream((u1*)data,
477 (int)size,
478 _name,
479 ClassFileStream::verify,
480 true); // from_boot_loader_modules_image
481 }
482
483 return NULL;
484 }
485
486 JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf,
487 const char* module_name,
488 const char* file_name,
489 jlong &size) {
490 return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size));
491 }
492
493 bool ClassPathImageEntry::is_modules_image() const {
494 assert(this == _singleton, "VM supports a single jimage");
495 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be used for jrt entry");
496 return true;
497 }
498
499 #if INCLUDE_CDS
500 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
501 assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "only called at dump time");
502 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure");
503 vm_exit_during_initialization(error, message);
504 }
505 #endif
506
507 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
508 _module_name = module_name;
509 _module_first_entry = NULL;
510 _module_last_entry = NULL;
511 }
512
513 ModuleClassPathList::~ModuleClassPathList() {
514 // Clean out each ClassPathEntry on list
515 ClassPathEntry* e = _module_first_entry;
516 while (e != NULL) {
517 ClassPathEntry* next_entry = e->next();
518 delete e;
519 e = next_entry;
520 }
521 }
522
523 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
524 if (new_entry != NULL) {
525 if (_module_last_entry == NULL) {
526 _module_first_entry = _module_last_entry = new_entry;
527 } else {
528 _module_last_entry->set_next(new_entry);
529 _module_last_entry = new_entry;
530 }
531 }
532 }
533
534 void ClassLoader::trace_class_path(const char* msg, const char* name) {
535 LogTarget(Info, class, path) lt;
536 if (lt.is_enabled()) {
537 LogStream ls(lt);
538 if (msg) {
539 ls.print("%s", msg);
540 }
541 if (name) {
542 if (strlen(name) < 256) {
543 ls.print("%s", name);
544 } else {
545 // For very long paths, we need to print each character separately,
546 // as print_cr() has a length limit
547 while (name[0] != '\0') {
548 ls.print("%c", name[0]);
549 name++;
550 }
551 }
552 }
553 ls.cr();
554 }
555 }
556
557 void ClassLoader::setup_bootstrap_search_path() {
558 const char* sys_class_path = Arguments::get_sysclasspath();
559 assert(sys_class_path != NULL, "System boot class path must not be NULL");
560 if (PrintSharedArchiveAndExit) {
561 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
562 // the same as the bootcp of the shared archive.
563 } else {
564 trace_class_path("bootstrap loader class path=", sys_class_path);
565 }
566 setup_boot_search_path(sys_class_path);
567 }
568
569 #if INCLUDE_CDS
570 void ClassLoader::setup_app_search_path(const char *class_path) {
571 assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "Sanity");
572
573 ResourceMark rm;
574 ClasspathStream cp_stream(class_path);
575
576 while (cp_stream.has_next()) {
577 const char* path = cp_stream.get_next();
578 update_class_path_entry_list(path, false, false, false);
579 }
580 }
581
582 void ClassLoader::add_to_module_path_entries(const char* path,
583 ClassPathEntry* entry) {
584 assert(entry != NULL, "ClassPathEntry should not be NULL");
585 assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "dump time only");
586
587 // The entry does not exist, add to the list
588 if (_module_path_entries == NULL) {
589 assert(_last_module_path_entry == NULL, "Sanity");
590 _module_path_entries = _last_module_path_entry = entry;
591 } else {
592 _last_module_path_entry->set_next(entry);
593 _last_module_path_entry = entry;
594 }
595 }
596
597 // Add a module path to the _module_path_entries list.
598 void ClassLoader::update_module_path_entry_list(const char *path, TRAPS) {
599 assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "dump time only");
600 struct stat st;
601 if (os::stat(path, &st) != 0) {
602 tty->print_cr("os::stat error %d (%s). CDS dump aborted (path was \"%s\").",
603 errno, os::errno_name(errno), path);
604 vm_exit_during_initialization();
605 }
606 // File or directory found
607 ClassPathEntry* new_entry = NULL;
608 new_entry = create_class_path_entry(path, &st, true /* throw_exception */,
609 false /*is_boot_append */, false /* from_class_path_attr */, CHECK);
610 if (new_entry == NULL) {
611 return;
612 }
613
614 add_to_module_path_entries(path, new_entry);
615 return;
616 }
617
618 void ClassLoader::setup_module_search_path(const char* path, TRAPS) {
619 update_module_path_entry_list(path, THREAD);
620 }
621
622 #endif // INCLUDE_CDS
623
624 void ClassLoader::close_jrt_image() {
625 // Not applicable for exploded builds
626 if (!ClassLoader::has_jrt_entry()) return;
627 _jrt_entry->close_jimage();
628 }
629
630 // Construct the array of module/path pairs as specified to --patch-module
631 // for the boot loader to search ahead of the jimage, if the class being
632 // loaded is defined to a module that has been specified to --patch-module.
633 void ClassLoader::setup_patch_mod_entries() {
634 Thread* THREAD = Thread::current();
635 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
636 int num_of_entries = patch_mod_args->length();
637
638 // Set up the boot loader's _patch_mod_entries list
639 _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true);
640
641 for (int i = 0; i < num_of_entries; i++) {
642 const char* module_name = (patch_mod_args->at(i))->module_name();
643 Symbol* const module_sym = SymbolTable::new_symbol(module_name);
644 assert(module_sym != NULL, "Failed to obtain Symbol for module name");
645 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
646
647 char* class_path = (patch_mod_args->at(i))->path_string();
648 ResourceMark rm(THREAD);
649 ClasspathStream cp_stream(class_path);
650
651 while (cp_stream.has_next()) {
652 const char* path = cp_stream.get_next();
653 struct stat st;
654 if (os::stat(path, &st) == 0) {
655 // File or directory found
656 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, false, CHECK);
657 // If the path specification is valid, enter it into this module's list
658 if (new_entry != NULL) {
659 module_cpl->add_to_list(new_entry);
660 }
661 }
662 }
663
664 // Record the module into the list of --patch-module entries only if
665 // valid ClassPathEntrys have been created
666 if (module_cpl->module_first_entry() != NULL) {
667 _patch_mod_entries->push(module_cpl);
668 }
669 }
670 }
671
672 // Determine whether the module has been patched via the command-line
673 // option --patch-module
674 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
675 if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) {
676 int table_len = _patch_mod_entries->length();
677 for (int i = 0; i < table_len; i++) {
678 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
679 if (module_name->fast_compare(patch_mod->module_name()) == 0) {
680 return true;
681 }
682 }
683 }
684 return false;
685 }
686
687 // Set up the _jrt_entry if present and boot append path
688 void ClassLoader::setup_boot_search_path(const char *class_path) {
689 EXCEPTION_MARK;
690 ResourceMark rm(THREAD);
691 ClasspathStream cp_stream(class_path);
692 bool set_base_piece = true;
693
694 #if INCLUDE_CDS
695 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
696 if (!Arguments::has_jimage()) {
697 vm_exit_during_initialization("CDS is not supported in exploded JDK build", NULL);
698 }
699 }
700 #endif
701
702 while (cp_stream.has_next()) {
703 const char* path = cp_stream.get_next();
704
705 if (set_base_piece) {
706 // The first time through the bootstrap_search setup, it must be determined
707 // what the base or core piece of the boot loader search is. Either a java runtime
708 // image is present or this is an exploded module build situation.
709 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
710 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
711 struct stat st;
712 if (os::stat(path, &st) == 0) {
713 // Directory found
714 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, false, CHECK);
715
716 // Check for a jimage
717 if (Arguments::has_jimage()) {
718 assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice");
719 _jrt_entry = new_entry;
720 assert(new_entry != NULL && new_entry->is_modules_image(), "No java runtime image present");
721 assert(_jrt_entry->jimage() != NULL, "No java runtime image");
722 }
723 } else {
724 // If path does not exist, exit
725 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
726 }
727 set_base_piece = false;
728 } else {
729 // Every entry on the system boot class path after the initial base piece,
730 // which is set by os::set_boot_path(), is considered an appended entry.
731 update_class_path_entry_list(path, false, true, false);
732 }
733 }
734 }
735
736 // During an exploded modules build, each module defined to the boot loader
737 // will be added to the ClassLoader::_exploded_entries array.
738 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) {
739 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
740 assert(_exploded_entries != NULL, "_exploded_entries was not initialized");
741
742 // Find the module's symbol
743 ResourceMark rm(THREAD);
744 const char *module_name = module_sym->as_C_string();
745 const char *home = Arguments::get_java_home();
746 const char file_sep = os::file_separator()[0];
747 // 10 represents the length of "modules" + 2 file separators + \0
748 size_t len = strlen(home) + strlen(module_name) + 10;
749 char *path = NEW_RESOURCE_ARRAY(char, len);
750 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
751
752 struct stat st;
753 if (os::stat(path, &st) == 0) {
754 // Directory found
755 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, false, CHECK);
756
757 // If the path specification is valid, enter it into this module's list.
758 // There is no need to check for duplicate modules in the exploded entry list,
759 // since no two modules with the same name can be defined to the boot loader.
760 // This is checked at module definition time in Modules::define_module.
761 if (new_entry != NULL) {
762 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
763 module_cpl->add_to_list(new_entry);
764 {
765 MutexLocker ml(Module_lock, THREAD);
766 _exploded_entries->push(module_cpl);
767 }
768 log_info(class, load)("path: %s", path);
769 }
770 }
771 }
772
773 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
774 bool throw_exception,
775 bool is_boot_append,
776 bool from_class_path_attr,
777 TRAPS) {
778 JavaThread* thread = JavaThread::current();
779 ClassPathEntry* new_entry = NULL;
780 if ((st->st_mode & S_IFMT) == S_IFREG) {
781 ResourceMark rm(thread);
782 // Regular file, should be a zip or jimage file
783 // Canonicalized filename
784 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
785 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
786 // This matches the classic VM
787 if (throw_exception) {
788 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
789 } else {
790 return NULL;
791 }
792 }
793 jint error;
794 JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
795 if (jimage != NULL) {
796 new_entry = new ClassPathImageEntry(jimage, canonical_path);
797 } else {
798 char* error_msg = NULL;
799 jzfile* zip;
800 {
801 // enable call to C land
802 ThreadToNativeFromVM ttn(thread);
803 HandleMark hm(thread);
804 zip = (*ZipOpen)(canonical_path, &error_msg);
805 }
806 if (zip != NULL && error_msg == NULL) {
807 new_entry = new ClassPathZipEntry(zip, path, is_boot_append, from_class_path_attr);
808 } else {
809 char *msg;
810 if (error_msg == NULL) {
811 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ;
812 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
813 } else {
814 int len = (int)(strlen(path) + strlen(error_msg) + 128);
815 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ;
816 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
817 }
818 // Don't complain about bad jar files added via -Xbootclasspath/a:.
819 if (throw_exception && is_init_completed()) {
820 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
821 } else {
822 return NULL;
823 }
824 }
825 }
826 log_info(class, path)("opened: %s", path);
827 log_info(class, load)("opened: %s", path);
828 } else {
829 // Directory
830 new_entry = new ClassPathDirEntry(path);
831 log_info(class, load)("path: %s", path);
832 }
833 return new_entry;
834 }
835
836
837 // Create a class path zip entry for a given path (return NULL if not found
838 // or zip/JAR file cannot be opened)
839 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
840 // check for a regular file
841 struct stat st;
842 if (os::stat(path, &st) == 0) {
843 if ((st.st_mode & S_IFMT) == S_IFREG) {
844 char canonical_path[JVM_MAXPATHLEN];
845 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
846 char* error_msg = NULL;
847 jzfile* zip;
848 {
849 // enable call to C land
850 JavaThread* thread = JavaThread::current();
851 ThreadToNativeFromVM ttn(thread);
852 HandleMark hm(thread);
853 zip = (*ZipOpen)(canonical_path, &error_msg);
854 }
855 if (zip != NULL && error_msg == NULL) {
856 // create using canonical path
857 return new ClassPathZipEntry(zip, canonical_path, is_boot_append, false);
858 }
859 }
860 }
861 }
862 return NULL;
863 }
864
865 // returns true if entry already on class path
866 bool ClassLoader::contains_append_entry(const char* name) {
867 ClassPathEntry* e = _first_append_entry;
868 while (e != NULL) {
869 // assume zip entries have been canonicalized
870 if (strcmp(name, e->name()) == 0) {
871 return true;
872 }
873 e = e->next();
874 }
875 return false;
876 }
877
878 void ClassLoader::add_to_boot_append_entries(ClassPathEntry *new_entry) {
879 if (new_entry != NULL) {
880 if (_last_append_entry == NULL) {
881 assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty");
882 _first_append_entry = _last_append_entry = new_entry;
883 } else {
884 _last_append_entry->set_next(new_entry);
885 _last_append_entry = new_entry;
886 }
887 }
888 }
889
890 // Record the path entries specified in -cp during dump time. The recorded
891 // information will be used at runtime for loading the archived app classes.
892 //
893 // Note that at dump time, ClassLoader::_app_classpath_entries are NOT used for
894 // loading app classes. Instead, the app class are loaded by the
895 // jdk/internal/loader/ClassLoaders$AppClassLoader instance.
896 void ClassLoader::add_to_app_classpath_entries(const char* path,
897 ClassPathEntry* entry,
898 bool check_for_duplicates) {
899 #if INCLUDE_CDS
900 assert(entry != NULL, "ClassPathEntry should not be NULL");
901 ClassPathEntry* e = _app_classpath_entries;
902 if (check_for_duplicates) {
903 while (e != NULL) {
904 if (strcmp(e->name(), entry->name()) == 0) {
905 // entry already exists
906 return;
907 }
908 e = e->next();
909 }
910 }
911
912 // The entry does not exist, add to the list
913 if (_app_classpath_entries == NULL) {
914 assert(_last_app_classpath_entry == NULL, "Sanity");
915 _app_classpath_entries = _last_app_classpath_entry = entry;
916 } else {
917 _last_app_classpath_entry->set_next(entry);
918 _last_app_classpath_entry = entry;
919 }
920
921 if (entry->is_jar_file()) {
922 ClassLoaderExt::process_jar_manifest(entry, check_for_duplicates);
923 }
924 #endif
925 }
926
927 // Returns true IFF the file/dir exists and the entry was successfully created.
928 bool ClassLoader::update_class_path_entry_list(const char *path,
929 bool check_for_duplicates,
930 bool is_boot_append,
931 bool from_class_path_attr,
932 bool throw_exception) {
933 struct stat st;
934 if (os::stat(path, &st) == 0) {
935 // File or directory found
936 ClassPathEntry* new_entry = NULL;
937 Thread* THREAD = Thread::current();
938 new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, from_class_path_attr, CHECK_(false));
939 if (new_entry == NULL) {
940 return false;
941 }
942
943 // Do not reorder the bootclasspath which would break get_system_package().
944 // Add new entry to linked list
945 if (is_boot_append) {
946 add_to_boot_append_entries(new_entry);
947 } else {
948 add_to_app_classpath_entries(path, new_entry, check_for_duplicates);
949 }
950 return true;
951 } else {
952 return false;
953 }
954 }
955
956 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
957 ResourceMark rm;
958 int num_of_entries = module_list->length();
959 for (int i = 0; i < num_of_entries; i++) {
960 ClassPathEntry* e;
961 ModuleClassPathList* mpl = module_list->at(i);
962 tty->print("%s=", mpl->module_name()->as_C_string());
963 e = mpl->module_first_entry();
964 while (e != NULL) {
965 tty->print("%s", e->name());
966 e = e->next();
967 if (e != NULL) {
968 tty->print("%s", os::path_separator());
969 }
970 }
971 tty->print(" ;");
972 }
973 }
974
975 void ClassLoader::print_bootclasspath() {
976 ClassPathEntry* e;
977 tty->print("[bootclasspath= ");
978
979 // Print --patch-module module/path specifications first
980 if (_patch_mod_entries != NULL) {
981 print_module_entry_table(_patch_mod_entries);
982 }
983
984 // [jimage | exploded modules build]
985 if (has_jrt_entry()) {
986 // Print the location of the java runtime image
987 tty->print("%s ;", _jrt_entry->name());
988 } else {
989 // Print exploded module build path specifications
990 if (_exploded_entries != NULL) {
991 print_module_entry_table(_exploded_entries);
992 }
993 }
994
995 // appended entries
996 e = _first_append_entry;
997 while (e != NULL) {
998 tty->print("%s ;", e->name());
999 e = e->next();
1000 }
1001 tty->print_cr("]");
1002 }
1003
1004 void ClassLoader::load_zip_library() {
1005 assert(ZipOpen == NULL, "should not load zip library twice");
1006 // First make sure native library is loaded
1007 os::native_java_library();
1008 // Load zip library
1009 char path[JVM_MAXPATHLEN];
1010 char ebuf[1024];
1011 void* handle = NULL;
1012 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
1013 handle = os::dll_load(path, ebuf, sizeof ebuf);
1014 }
1015 if (handle == NULL) {
1016 vm_exit_during_initialization("Unable to load ZIP library", path);
1017 }
1018 // Lookup zip entry points
1019 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
1020 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
1021 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
1022 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
1023 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
1024 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
1025 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
1026
1027 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
1028 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
1029 GetNextEntry == NULL || Crc32 == NULL) {
1030 vm_exit_during_initialization("Corrupted ZIP library", path);
1031 }
1032
1033 if (ZipInflateFully == NULL) {
1034 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
1035 }
1036
1037 // Lookup canonicalize entry in libjava.dll
1038 void *javalib_handle = os::native_java_library();
1039 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
1040 // This lookup only works on 1.3. Do not check for non-null here
1041 }
1042
1043 void ClassLoader::load_jimage_library() {
1044 // First make sure native library is loaded
1045 os::native_java_library();
1046 // Load jimage library
1047 char path[JVM_MAXPATHLEN];
1048 char ebuf[1024];
1049 void* handle = NULL;
1050 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
1051 handle = os::dll_load(path, ebuf, sizeof ebuf);
1052 }
1053 if (handle == NULL) {
1054 vm_exit_during_initialization("Unable to load jimage library", path);
1055 }
1056
1057 // Lookup jimage entry points
1058 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open"));
1059 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found");
1060 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close"));
1061 guarantee(JImageClose != NULL, "function JIMAGE_Close not found");
1062 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule"));
1063 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found");
1064 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource"));
1065 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found");
1066 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource"));
1067 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found");
1068 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator"));
1069 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found");
1070 }
1071
1072 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
1073 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
1074 }
1075
1076 int ClassLoader::crc32(int crc, const char* buf, int len) {
1077 assert(Crc32 != NULL, "ZIP_CRC32 is not found");
1078 return (*Crc32)(crc, (const jbyte*)buf, len);
1079 }
1080
1081 // Function add_package extracts the package from the fully qualified class name
1082 // and checks if the package is in the boot loader's package entry table. If so,
1083 // then it sets the classpath_index in the package entry record.
1084 //
1085 // The classpath_index field is used to find the entry on the boot loader class
1086 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
1087 // in an unnamed module. It is also used to indicate (for all packages whose
1088 // classes are loaded by the boot loader) that at least one of the package's
1089 // classes has been loaded.
1090 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) {
1091 assert(fullq_class_name != NULL, "just checking");
1092
1093 // Get package name from fully qualified class name.
1094 ResourceMark rm;
1095 const char *cp = package_from_name(fullq_class_name);
1096 if (cp != NULL) {
1097 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();
1098 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp);
1099 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol);
1100 if (pkg_entry != NULL) {
1101 assert(classpath_index != -1, "Unexpected classpath_index");
1102 pkg_entry->set_classpath_index(classpath_index);
1103 } else {
1104 return false;
1105 }
1106 }
1107 return true;
1108 }
1109
1110 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1111 // Look up the name in the boot loader's package entry table.
1112 if (name != NULL) {
1113 TempNewSymbol package_sym = SymbolTable::new_symbol(name);
1114 // Look for the package entry in the boot loader's package entry table.
1115 PackageEntry* package =
1116 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1117
1118 // Return NULL if package does not exist or if no classes in that package
1119 // have been loaded.
1120 if (package != NULL && package->has_loaded_class()) {
1121 ModuleEntry* module = package->module();
1122 if (module->location() != NULL) {
1123 ResourceMark rm(THREAD);
1124 Handle ml = java_lang_String::create_from_str(
1125 module->location()->as_C_string(), THREAD);
1126 return ml();
1127 }
1128 // Return entry on boot loader class path.
1129 Handle cph = java_lang_String::create_from_str(
1130 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1131 return cph();
1132 }
1133 }
1134 return NULL;
1135 }
1136
1137 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1138 ResourceMark rm(THREAD);
1139 // List of pointers to PackageEntrys that have loaded classes.
1140 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
1141 {
1142 MutexLocker ml(Module_lock, THREAD);
1143
1144 PackageEntryTable* pe_table =
1145 ClassLoaderData::the_null_class_loader_data()->packages();
1146
1147 // Collect the packages that have at least one loaded class.
1148 for (int x = 0; x < pe_table->table_size(); x++) {
1149 for (PackageEntry* package_entry = pe_table->bucket(x);
1150 package_entry != NULL;
1151 package_entry = package_entry->next()) {
1152 if (package_entry->has_loaded_class()) {
1153 loaded_class_pkgs->append(package_entry);
1154 }
1155 }
1156 }
1157 }
1158
1159
1160 // Allocate objArray and fill with java.lang.String
1161 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1162 loaded_class_pkgs->length(), CHECK_NULL);
1163 objArrayHandle result(THREAD, r);
1164 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1165 PackageEntry* package_entry = loaded_class_pkgs->at(x);
1166 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1167 result->obj_at_put(x, str());
1168 }
1169 return result();
1170 }
1171
1172 // caller needs ResourceMark
1173 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1174 int class_name_len) {
1175 assert(class_name != NULL, "invariant");
1176 assert((int)strlen(class_name) == class_name_len, "invariant");
1177
1178 static const char class_suffix[] = ".class";
1179 size_t class_suffix_len = sizeof(class_suffix);
1180
1181 char* const file_name = NEW_RESOURCE_ARRAY(char,
1182 class_name_len +
1183 class_suffix_len); // includes term NULL
1184
1185 strncpy(file_name, class_name, class_name_len);
1186 strncpy(&file_name[class_name_len], class_suffix, class_suffix_len);
1187
1188 return file_name;
1189 }
1190
1191 ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
1192 const GrowableArray<ModuleClassPathList*>* const module_list) {
1193 int num_of_entries = module_list->length();
1194 const Symbol* class_module_name = mod_entry->name();
1195
1196 // Loop through all the modules in either the patch-module or exploded entries looking for module
1197 for (int i = 0; i < num_of_entries; i++) {
1198 ModuleClassPathList* module_cpl = module_list->at(i);
1199 Symbol* module_cpl_name = module_cpl->module_name();
1200
1201 if (module_cpl_name->fast_compare(class_module_name) == 0) {
1202 // Class' module has been located.
1203 return module_cpl->module_first_entry();
1204 }
1205 }
1206 return NULL;
1207 }
1208
1209
1210 // Search either the patch-module or exploded build entries for class.
1211 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list,
1212 const char* const class_name,
1213 const char* const file_name,
1214 TRAPS) {
1215 ClassFileStream* stream = NULL;
1216
1217 // Find the class' defining module in the boot loader's module entry table
1218 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
1219 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL;
1220
1221 // If the module system has not defined java.base yet, then
1222 // classes loaded are assumed to be defined to java.base.
1223 // When java.base is eventually defined by the module system,
1224 // all packages of classes that have been previously loaded
1225 // are verified in ModuleEntryTable::verify_javabase_packages().
1226 if (!Universe::is_module_initialized() &&
1227 !ModuleEntryTable::javabase_defined() &&
1228 mod_entry == NULL) {
1229 mod_entry = ModuleEntryTable::javabase_moduleEntry();
1230 }
1231
1232 // The module must be a named module
1233 ClassPathEntry* e = NULL;
1234 if (mod_entry != NULL && mod_entry->is_named()) {
1235 if (module_list == _exploded_entries) {
1236 // The exploded build entries can be added to at any time so a lock is
1237 // needed when searching them.
1238 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
1239 MutexLocker ml(Module_lock, THREAD);
1240 e = find_first_module_cpe(mod_entry, module_list);
1241 } else {
1242 e = find_first_module_cpe(mod_entry, module_list);
1243 }
1244 }
1245
1246 // Try to load the class from the module's ClassPathEntry list.
1247 while (e != NULL) {
1248 stream = e->open_stream(file_name, CHECK_NULL);
1249 // No context.check is required since CDS is not supported
1250 // for an exploded modules build or if --patch-module is specified.
1251 if (NULL != stream) {
1252 return stream;
1253 }
1254 e = e->next();
1255 }
1256 // If the module was located, break out even if the class was not
1257 // located successfully from that module's ClassPathEntry list.
1258 // There will not be another valid entry for that module.
1259 return NULL;
1260 }
1261
1262 // Called by the boot classloader to load classes
1263 InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1264 assert(name != NULL, "invariant");
1265 assert(THREAD->is_Java_thread(), "must be a JavaThread");
1266
1267 ResourceMark rm(THREAD);
1268 HandleMark hm(THREAD);
1269
1270 const char* const class_name = name->as_C_string();
1271
1272 EventMark m("loading class %s", class_name);
1273
1274 const char* const file_name = file_name_for_class_name(class_name,
1275 name->utf8_length());
1276 assert(file_name != NULL, "invariant");
1277
1278 // Lookup stream for parsing .class file
1279 ClassFileStream* stream = NULL;
1280 s2 classpath_index = 0;
1281 ClassPathEntry* e = NULL;
1282
1283 // If search_append_only is true, boot loader visibility boundaries are
1284 // set to be _first_append_entry to the end. This includes:
1285 // [-Xbootclasspath/a]; [jvmti appended entries]
1286 //
1287 // If search_append_only is false, boot loader visibility boundaries are
1288 // set to be the --patch-module entries plus the base piece. This includes:
1289 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1290 //
1291
1292 // Load Attempt #1: --patch-module
1293 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1294 // attempt to load the class from those locations specific to the module.
1295 // Specifications to --patch-module can contain a partial number of classes
1296 // that are part of the overall module definition. So if a particular class is not
1297 // found within its module specification, the search should continue to Load Attempt #2.
1298 // Note: The --patch-module entries are never searched if the boot loader's
1299 // visibility boundary is limited to only searching the append entries.
1300 if (_patch_mod_entries != NULL && !search_append_only) {
1301 // At CDS dump time, the --patch-module entries are ignored. That means a
1302 // class is still loaded from the runtime image even if it might
1303 // appear in the _patch_mod_entries. The runtime shared class visibility
1304 // check will determine if a shared class is visible based on the runtime
1305 // environemnt, including the runtime --patch-module setting.
1306 //
1307 // DynamicDumpSharedSpaces requires UseSharedSpaces to be enabled. Since --patch-module
1308 // is not supported with UseSharedSpaces, it is not supported with DynamicDumpSharedSpaces.
1309 assert(!DynamicDumpSharedSpaces, "sanity");
1310 if (!DumpSharedSpaces) {
1311 stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL);
1312 }
1313 }
1314
1315 // Load Attempt #2: [jimage | exploded build]
1316 if (!search_append_only && (NULL == stream)) {
1317 if (has_jrt_entry()) {
1318 e = _jrt_entry;
1319 stream = _jrt_entry->open_stream(file_name, CHECK_NULL);
1320 } else {
1321 // Exploded build - attempt to locate class in its defining module's location.
1322 assert(_exploded_entries != NULL, "No exploded build entries present");
1323 stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL);
1324 }
1325 }
1326
1327 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1328 if (search_append_only && (NULL == stream)) {
1329 // For the boot loader append path search, the starting classpath_index
1330 // for the appended piece is always 1 to account for either the
1331 // _jrt_entry or the _exploded_entries.
1332 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1333 classpath_index = 1;
1334
1335 e = _first_append_entry;
1336 while (e != NULL) {
1337 stream = e->open_stream(file_name, CHECK_NULL);
1338 if (NULL != stream) {
1339 break;
1340 }
1341 e = e->next();
1342 ++classpath_index;
1343 }
1344 }
1345
1346 if (NULL == stream) {
1347 return NULL;
1348 }
1349
1350 stream->set_verify(ClassLoaderExt::should_verify(classpath_index));
1351
1352 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1353 Handle protection_domain;
1354
1355 InstanceKlass* result = KlassFactory::create_from_stream(stream,
1356 name,
1357 loader_data,
1358 protection_domain,
1359 NULL, // unsafe_anonymous_host
1360 NULL, // cp_patches
1361 THREAD);
1362 if (HAS_PENDING_EXCEPTION) {
1363 if (DumpSharedSpaces) {
1364 tty->print_cr("Preload Error: Failed to load %s", class_name);
1365 }
1366 return NULL;
1367 }
1368
1369 if (!add_package(file_name, classpath_index, THREAD)) {
1370 return NULL;
1371 }
1372
1373 return result;
1374 }
1375
1376 #if INCLUDE_CDS
1377 char* ClassLoader::skip_uri_protocol(char* source) {
1378 if (strncmp(source, "file:", 5) == 0) {
1379 // file: protocol path could start with file:/ or file:///
1380 // locate the char after all the forward slashes
1381 int offset = 5;
1382 while (*(source + offset) == '/') {
1383 offset++;
1384 }
1385 source += offset;
1386 // for non-windows platforms, move back one char as the path begins with a '/'
1387 #ifndef _WINDOWS
1388 source -= 1;
1389 #endif
1390 } else if (strncmp(source, "jrt:/", 5) == 0) {
1391 source += 5;
1392 }
1393 return source;
1394 }
1395
1396 // Record the shared classpath index and loader type for classes loaded
1397 // by the builtin loaders at dump time.
1398 void ClassLoader::record_result(InstanceKlass* ik, const ClassFileStream* stream, TRAPS) {
1399 assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "sanity");
1400 assert(stream != NULL, "sanity");
1401
1402 if (ik->is_unsafe_anonymous()) {
1403 // We do not archive unsafe anonymous classes.
1404 return;
1405 }
1406
1407 oop loader = ik->class_loader();
1408 char* src = (char*)stream->source();
1409 if (src == NULL) {
1410 if (loader == NULL) {
1411 // JFR classes
1412 ik->set_shared_classpath_index(0);
1413 ik->set_class_loader_type(ClassLoader::BOOT_LOADER);
1414 }
1415 return;
1416 }
1417
1418 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build");
1419
1420 ResourceMark rm(THREAD);
1421 int classpath_index = -1;
1422 PackageEntry* pkg_entry = ik->package();
1423
1424 if (FileMapInfo::get_number_of_shared_paths() > 0) {
1425 char* canonical_path_table_entry = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
1426
1427 // save the path from the file: protocol or the module name from the jrt: protocol
1428 // if no protocol prefix is found, path is the same as stream->source()
1429 char* path = skip_uri_protocol(src);
1430 char* canonical_class_src_path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
1431 bool success = get_canonical_path(path, canonical_class_src_path, JVM_MAXPATHLEN);
1432 // The path is from the ClassFileStream. Since a ClassFileStream has been created successfully in functions
1433 // such as ClassLoader::load_class(), its source path must be valid.
1434 assert(success, "must be valid path");
1435 for (int i = 0; i < FileMapInfo::get_number_of_shared_paths(); i++) {
1436 SharedClassPathEntry* ent = FileMapInfo::shared_path(i);
1437 success = get_canonical_path(ent->name(), canonical_path_table_entry, JVM_MAXPATHLEN);
1438 // A shared path has been validated during its creation in ClassLoader::create_class_path_entry(),
1439 // it must be valid here.
1440 assert(success, "must be valid path");
1441 // If the path (from the class stream source) is the same as the shared
1442 // class or module path, then we have a match.
1443 if (strcmp(canonical_path_table_entry, canonical_class_src_path) == 0) {
1444 // NULL pkg_entry and pkg_entry in an unnamed module implies the class
1445 // is from the -cp or boot loader append path which consists of -Xbootclasspath/a
1446 // and jvmti appended entries.
1447 if ((pkg_entry == NULL) || (pkg_entry->in_unnamed_module())) {
1448 // Ensure the index is within the -cp range before assigning
1449 // to the classpath_index.
1450 if (SystemDictionary::is_system_class_loader(loader) &&
1451 (i >= ClassLoaderExt::app_class_paths_start_index()) &&
1452 (i < ClassLoaderExt::app_module_paths_start_index())) {
1453 classpath_index = i;
1454 break;
1455 } else {
1456 if ((i >= 1) &&
1457 (i < ClassLoaderExt::app_class_paths_start_index())) {
1458 // The class must be from boot loader append path which consists of
1459 // -Xbootclasspath/a and jvmti appended entries.
1460 assert(loader == NULL, "sanity");
1461 classpath_index = i;
1462 break;
1463 }
1464 }
1465 } else {
1466 // A class from a named module from the --module-path. Ensure the index is
1467 // within the --module-path range before assigning to the classpath_index.
1468 if ((pkg_entry != NULL) && !(pkg_entry->in_unnamed_module()) && (i > 0)) {
1469 if (i >= ClassLoaderExt::app_module_paths_start_index() &&
1470 i < FileMapInfo::get_number_of_shared_paths()) {
1471 classpath_index = i;
1472 break;
1473 }
1474 }
1475 }
1476 }
1477 // for index 0 and the stream->source() is the modules image or has the jrt: protocol.
1478 // The class must be from the runtime modules image.
1479 if (i == 0 && (stream->from_boot_loader_modules_image() || string_starts_with(src, "jrt:"))) {
1480 classpath_index = i;
1481 break;
1482 }
1483 }
1484
1485 // No path entry found for this class. Must be a shared class loaded by the
1486 // user defined classloader.
1487 if (classpath_index < 0) {
1488 assert(ik->shared_classpath_index() < 0, "Sanity");
1489 ik->set_shared_classpath_index(UNREGISTERED_INDEX);
1490 SystemDictionaryShared::set_shared_class_misc_info(ik, (ClassFileStream*)stream);
1491 return;
1492 }
1493 } else {
1494 // The shared path table is set up after module system initialization.
1495 // The path table contains no entry before that. Any classes loaded prior
1496 // to the setup of the shared path table must be from the modules image.
1497 assert(stream->from_boot_loader_modules_image(), "stream must be loaded by boot loader from modules image");
1498 assert(FileMapInfo::get_number_of_shared_paths() == 0, "shared path table must not have been setup");
1499 classpath_index = 0;
1500 }
1501
1502 const char* const class_name = ik->name()->as_C_string();
1503 const char* const file_name = file_name_for_class_name(class_name,
1504 ik->name()->utf8_length());
1505 assert(file_name != NULL, "invariant");
1506
1507 ClassLoaderExt::record_result(classpath_index, ik, THREAD);
1508 }
1509 #endif // INCLUDE_CDS
1510
1511 // Initialize the class loader's access to methods in libzip. Parse and
1512 // process the boot classpath into a list ClassPathEntry objects. Once
1513 // this list has been created, it must not change order (see class PackageInfo)
1514 // it can be appended to and is by jvmti and the kernel vm.
1515
1516 void ClassLoader::initialize() {
1517 EXCEPTION_MARK;
1518
1519 if (UsePerfData) {
1520 // jvmstat performance counters
1521 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1522 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1523 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1524 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1525 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1526 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1527 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1528 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1529 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1530 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1531
1532 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1533 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1534 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1535 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1536 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1537 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1538 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1539 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1540 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1541 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1542 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1543 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1544 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1545
1546
1547 // The following performance counters are added for measuring the impact
1548 // of the bug fix of 6365597. They are mainly focused on finding out
1549 // the behavior of system & user-defined classloader lock, whether
1550 // ClassLoader.loadClass/findClass is being called synchronized or not.
1551 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1552 "systemLoaderLockContentionRate");
1553 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1554 "nonSystemLoaderLockContentionRate");
1555 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1556 "jvmFindLoadedClassNoLockCalls");
1557 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1558 "jvmDefineClassNoLockCalls");
1559
1560 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1561 "jniDefineClassNoLockCalls");
1562
1563 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1564 "unsafeDefineClassCalls");
1565 }
1566
1567 // lookup zip library entry points
1568 load_zip_library();
1569 // lookup jimage library entry points
1570 load_jimage_library();
1571
1572 setup_bootstrap_search_path();
1573 }
1574
1575 #if INCLUDE_CDS
1576 void ClassLoader::initialize_shared_path() {
1577 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
1578 ClassLoaderExt::setup_search_paths();
1579 }
1580 }
1581
1582 void ClassLoader::initialize_module_path(TRAPS) {
1583 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
1584 ClassLoaderExt::setup_module_paths(THREAD);
1585 FileMapInfo::allocate_shared_path_table();
1586 }
1587 }
1588 #endif
1589
1590 jlong ClassLoader::classloader_time_ms() {
1591 return UsePerfData ?
1592 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1593 }
1594
1595 jlong ClassLoader::class_init_count() {
1596 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1597 }
1598
1599 jlong ClassLoader::class_init_time_ms() {
1600 return UsePerfData ?
1601 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1602 }
1603
1604 jlong ClassLoader::class_verify_time_ms() {
1605 return UsePerfData ?
1606 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1607 }
1608
1609 jlong ClassLoader::class_link_count() {
1610 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1611 }
1612
1613 jlong ClassLoader::class_link_time_ms() {
1614 return UsePerfData ?
1615 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1616 }
1617
1618 int ClassLoader::compute_Object_vtable() {
1619 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1620 // code to determine actual value from file
1621 // Would be value '11' if finals were in vtable
1622 int JDK_1_2_Object_vtable_size = 5;
1623 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1624 }
1625
1626
1627 void classLoader_init1() {
1628 ClassLoader::initialize();
1629 }
1630
1631 // Complete the ClassPathEntry setup for the boot loader
1632 void ClassLoader::classLoader_init2(TRAPS) {
1633 // Setup the list of module/path pairs for --patch-module processing
1634 // This must be done after the SymbolTable is created in order
1635 // to use fast_compare on module names instead of a string compare.
1636 if (Arguments::get_patch_mod_prefix() != NULL) {
1637 setup_patch_mod_entries();
1638 }
1639
1640 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
1641 // to successfully determine if java.base has been patched)
1642 create_javabase();
1643
1644 // Setup the initial java.base/path pair for the exploded build entries.
1645 // As more modules are defined during module system initialization, more
1646 // entries will be added to the exploded build array.
1647 if (!has_jrt_entry()) {
1648 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds");
1649 assert(!DynamicDumpSharedSpaces, "DynamicDumpSharedSpaces not supported with exploded module builds");
1650 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds");
1651 // Set up the boot loader's _exploded_entries list. Note that this gets
1652 // done before loading any classes, by the same thread that will
1653 // subsequently do the first class load. So, no lock is needed for this.
1654 assert(_exploded_entries == NULL, "Should only get initialized once");
1655 _exploded_entries = new (ResourceObj::C_HEAP, mtModule)
1656 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true);
1657 add_to_exploded_build_list(vmSymbols::java_base(), CHECK);
1658 }
1659 }
1660
1661
1662 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1663 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1664 if (CanonicalizeEntry != NULL) {
1665 JavaThread* THREAD = JavaThread::current();
1666 JNIEnv* env = THREAD->jni_environment();
1667 ResourceMark rm(THREAD);
1668
1669 // os::native_path writes into orig_copy
1670 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1671 strcpy(orig_copy, orig);
1672 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1673 return false;
1674 }
1675 } else {
1676 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1677 strncpy(out, orig, len);
1678 out[len - 1] = '\0';
1679 }
1680 return true;
1681 }
1682
1683 void ClassLoader::create_javabase() {
1684 Thread* THREAD = Thread::current();
1685
1686 // Create java.base's module entry for the boot
1687 // class loader prior to loading j.l.Ojbect.
1688 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1689
1690 // Get module entry table
1691 ModuleEntryTable* null_cld_modules = null_cld->modules();
1692 if (null_cld_modules == NULL) {
1693 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1694 }
1695
1696 {
1697 MutexLocker ml(Module_lock, THREAD);
1698 ModuleEntry* jb_module = null_cld_modules->locked_create_entry(Handle(),
1699 false, vmSymbols::java_base(), NULL, NULL, null_cld);
1700 if (jb_module == NULL) {
1701 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
1702 }
1703 ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1704 }
1705 }
1706
1707 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1708 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1709 void PerfClassTraceTime::initialize() {
1710 if (!UsePerfData) return;
1711
1712 if (_eventp != NULL) {
1713 // increment the event counter
1714 _eventp->inc();
1715 }
1716
1717 // stop the current active thread-local timer to measure inclusive time
1718 _prev_active_event = -1;
1719 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1720 if (_timers[i].is_active()) {
1721 assert(_prev_active_event == -1, "should have only one active timer");
1722 _prev_active_event = i;
1723 _timers[i].stop();
1724 }
1725 }
1726
1727 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1728 // start the inclusive timer if not recursively called
1729 _t.start();
1730 }
1731
1732 // start thread-local timer of the given event type
1733 if (!_timers[_event_type].is_active()) {
1734 _timers[_event_type].start();
1735 }
1736 }
1737
1738 PerfClassTraceTime::~PerfClassTraceTime() {
1739 if (!UsePerfData) return;
1740
1741 // stop the thread-local timer as the event completes
1742 // and resume the thread-local timer of the event next on the stack
1743 _timers[_event_type].stop();
1744 jlong selftime = _timers[_event_type].ticks();
1745
1746 if (_prev_active_event >= 0) {
1747 _timers[_prev_active_event].start();
1748 }
1749
1750 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1751
1752 // increment the counters only on the leaf call
1753 _t.stop();
1754 _timep->inc(_t.ticks());
1755 if (_selftimep != NULL) {
1756 _selftimep->inc(selftime);
1757 }
1758 // add all class loading related event selftime to the accumulated time counter
1759 ClassLoader::perf_accumulated_time()->inc(selftime);
1760
1761 // reset the timer
1762 _timers[_event_type].reset();
1763 }