1 /*
2 * Copyright (c) 1997, 2014, 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 "classfile/classFileParser.hpp"
27 #include "classfile/classFileStream.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderExt.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/javaClasses.hpp"
32 #if INCLUDE_CDS
33 #include "classfile/sharedPathsMiscInfo.hpp"
34 #include "classfile/sharedClassUtil.hpp"
35 #endif
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/vmSymbols.hpp"
38 #include "compiler/compileBroker.hpp"
39 #include "gc_interface/collectedHeap.inline.hpp"
40 #include "interpreter/bytecodeStream.hpp"
41 #include "interpreter/oopMapCache.hpp"
42 #include "memory/allocation.inline.hpp"
43 #include "memory/filemap.hpp"
44 #include "memory/generation.hpp"
45 #include "memory/oopFactory.hpp"
46 #include "memory/universe.inline.hpp"
47 #include "oops/instanceKlass.hpp"
48 #include "oops/instanceRefKlass.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "oops/symbol.hpp"
51 #include "prims/jvm_misc.hpp"
52 #include "runtime/arguments.hpp"
53 #include "runtime/compilationPolicy.hpp"
54 #include "runtime/fprofiler.hpp"
55 #include "runtime/handles.hpp"
56 #include "runtime/handles.inline.hpp"
57 #include "runtime/init.hpp"
58 #include "runtime/interfaceSupport.hpp"
59 #include "runtime/java.hpp"
60 #include "runtime/javaCalls.hpp"
61 #include "runtime/os.hpp"
62 #include "runtime/threadCritical.hpp"
63 #include "runtime/timer.hpp"
64 #include "services/management.hpp"
65 #include "services/threadService.hpp"
66 #include "utilities/events.hpp"
67 #include "utilities/hashtable.hpp"
68 #include "utilities/hashtable.inline.hpp"
69
70 // Entry points in zip.dll for loading zip/jar file entries
71
72 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg);
73 typedef void (JNICALL *ZipClose_t)(jzfile *zip);
74 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
75 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
76 typedef jboolean (JNICALL *ReadMappedEntry_t)(jzfile *zip, jzentry *entry, unsigned char **buf, char *namebuf);
77 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n);
78
79 static ZipOpen_t ZipOpen = NULL;
80 static ZipClose_t ZipClose = NULL;
81 static FindEntry_t FindEntry = NULL;
82 static ReadEntry_t ReadEntry = NULL;
83 static ReadMappedEntry_t ReadMappedEntry = NULL;
84 static GetNextEntry_t GetNextEntry = NULL;
85 static canonicalize_fn_t CanonicalizeEntry = NULL;
86
87 // Globals
88
89 PerfCounter* ClassLoader::_perf_accumulated_time = NULL;
90 PerfCounter* ClassLoader::_perf_classes_inited = NULL;
91 PerfCounter* ClassLoader::_perf_class_init_time = NULL;
92 PerfCounter* ClassLoader::_perf_class_init_selftime = NULL;
93 PerfCounter* ClassLoader::_perf_classes_verified = NULL;
94 PerfCounter* ClassLoader::_perf_class_verify_time = NULL;
95 PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL;
96 PerfCounter* ClassLoader::_perf_classes_linked = NULL;
97 PerfCounter* ClassLoader::_perf_class_link_time = NULL;
98 PerfCounter* ClassLoader::_perf_class_link_selftime = NULL;
99 PerfCounter* ClassLoader::_perf_class_parse_time = NULL;
100 PerfCounter* ClassLoader::_perf_class_parse_selftime = NULL;
101 PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL;
102 PerfCounter* ClassLoader::_perf_shared_classload_time = NULL;
103 PerfCounter* ClassLoader::_perf_sys_classload_time = NULL;
104 PerfCounter* ClassLoader::_perf_app_classload_time = NULL;
105 PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL;
106 PerfCounter* ClassLoader::_perf_app_classload_count = NULL;
107 PerfCounter* ClassLoader::_perf_define_appclasses = NULL;
108 PerfCounter* ClassLoader::_perf_define_appclass_time = NULL;
109 PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL;
110 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL;
111 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL;
112 PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
113 PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
114 PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
115 PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
116 PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
117 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL;
118 PerfCounter* ClassLoader::_isUnsyncloadClass = NULL;
119 PerfCounter* ClassLoader::_load_instance_class_failCounter = NULL;
120
121 ClassPathEntry* ClassLoader::_first_entry = NULL;
122 ClassPathEntry* ClassLoader::_last_entry = NULL;
123 int ClassLoader::_num_entries = 0;
124 PackageHashtable* ClassLoader::_package_hash_table = NULL;
125
126 #if INCLUDE_CDS
127 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL;
128 #endif
129 // helper routines
130 bool string_starts_with(const char* str, const char* str_to_find) {
131 size_t str_len = strlen(str);
132 size_t str_to_find_len = strlen(str_to_find);
133 if (str_to_find_len > str_len) {
134 return false;
135 }
136 return (strncmp(str, str_to_find, str_to_find_len) == 0);
137 }
138
139 bool string_ends_with(const char* str, const char* str_to_find) {
140 size_t str_len = strlen(str);
141 size_t str_to_find_len = strlen(str_to_find);
142 if (str_to_find_len > str_len) {
143 return false;
144 }
145 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
146 }
147
148
149 MetaIndex::MetaIndex(char** meta_package_names, int num_meta_package_names) {
150 if (num_meta_package_names == 0) {
151 _meta_package_names = NULL;
152 _num_meta_package_names = 0;
153 } else {
154 _meta_package_names = NEW_C_HEAP_ARRAY(char*, num_meta_package_names, mtClass);
155 _num_meta_package_names = num_meta_package_names;
156 memcpy(_meta_package_names, meta_package_names, num_meta_package_names * sizeof(char*));
157 }
158 }
159
160
161 MetaIndex::~MetaIndex() {
162 FREE_C_HEAP_ARRAY(char*, _meta_package_names, mtClass);
163 }
164
165
166 bool MetaIndex::may_contain(const char* class_name) {
167 if ( _num_meta_package_names == 0) {
168 return false;
169 }
170 size_t class_name_len = strlen(class_name);
171 for (int i = 0; i < _num_meta_package_names; i++) {
172 char* pkg = _meta_package_names[i];
173 size_t pkg_len = strlen(pkg);
174 size_t min_len = MIN2(class_name_len, pkg_len);
175 if (!strncmp(class_name, pkg, min_len)) {
176 return true;
177 }
178 }
179 return false;
180 }
181
182
183 ClassPathEntry::ClassPathEntry() {
184 set_next(NULL);
185 }
186
187
188 bool ClassPathEntry::is_lazy() {
189 return false;
190 }
191
192 ClassPathDirEntry::ClassPathDirEntry(char* dir) : ClassPathEntry() {
193 _dir = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
194 strcpy(_dir, dir);
195 }
196
197
198 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
199 // construct full path name
200 char path[JVM_MAXPATHLEN];
201 if (jio_snprintf(path, sizeof(path), "%s%s%s", _dir, os::file_separator(), name) == -1) {
202 return NULL;
203 }
204 // check if file exists
205 struct stat st;
206 if (os::stat(path, &st) == 0) {
207 #if INCLUDE_CDS
208 if (DumpSharedSpaces) {
209 // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so
210 // we should never find a file underneath it -- unless user has added a new file while we are running
211 // the dump, in which case let's quit!
212 ShouldNotReachHere();
213 ClassLoader::exit_with_path_failure("VM internal error. Classes can be loaded only from JAR files during dump time: %s", path);
214 }
215 #endif
216 // found file, open it
217 int file_handle = os::open(path, 0, 0);
218 if (file_handle != -1) {
219 // read contents into resource array
220 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
221 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
222 // close file
223 os::close(file_handle);
224 // construct ClassFileStream
225 if (num_read == (size_t)st.st_size) {
226 if (UsePerfData) {
227 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
228 }
229 return new ClassFileStream(buffer, st.st_size, _dir); // Resource allocated
230 }
231 }
232 }
233 return NULL;
234 }
235
236
237 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name) : ClassPathEntry() {
238 _zip = zip;
239 _zip_name = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
240 strcpy(_zip_name, zip_name);
241 }
242
243 ClassPathZipEntry::~ClassPathZipEntry() {
244 if (ZipClose != NULL) {
245 (*ZipClose)(_zip);
246 }
247 FREE_C_HEAP_ARRAY(char, _zip_name, mtClass);
248 }
249
250 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
251 // enable call to C land
252 JavaThread* thread = JavaThread::current();
253 ThreadToNativeFromVM ttn(thread);
254 // check whether zip archive contains name
255 jint name_len;
256 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
257 if (entry == NULL) return NULL;
258 u1* buffer;
259 char name_buf[128];
260 char* filename;
261 if (name_len < 128) {
262 filename = name_buf;
263 } else {
264 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
265 }
266
267 // file found, get pointer to the entry in mmapped jar file.
268 if (ReadMappedEntry == NULL ||
269 !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) {
270 // mmapped access not available, perhaps due to compression,
271 // read contents into resource array
272 int size = (*filesize) + ((nul_terminate) ? 1 : 0);
273 buffer = NEW_RESOURCE_ARRAY(u1, size);
274 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
275 }
276
277 // return result
278 if (nul_terminate) {
279 buffer[*filesize] = 0;
280 }
281 return buffer;
282 }
283
284 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
285 jint filesize;
286 u1* buffer = open_entry(name, &filesize, false, CHECK_NULL);
287 if (buffer == NULL) {
288 return NULL;
289 }
290 if (UsePerfData) {
291 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
292 }
293 return new ClassFileStream(buffer, filesize, _zip_name); // Resource allocated
294 }
295
296 // invoke function for each entry in the zip file
297 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
298 JavaThread* thread = JavaThread::current();
299 HandleMark handle_mark(thread);
300 ThreadToNativeFromVM ttn(thread);
301 for (int n = 0; ; n++) {
302 jzentry * ze = ((*GetNextEntry)(_zip, n));
303 if (ze == NULL) break;
304 (*f)(ze->name, context);
305 }
306 }
307
308 LazyClassPathEntry::LazyClassPathEntry(char* path, const struct stat* st, bool throw_exception) : ClassPathEntry() {
309 _path = os::strdup_check_oom(path);
310 _st = *st;
311 _meta_index = NULL;
312 _resolved_entry = NULL;
313 _has_error = false;
314 _throw_exception = throw_exception;
315 }
316
317 LazyClassPathEntry::~LazyClassPathEntry() {
318 os::free(_path);
319 }
320
321 bool LazyClassPathEntry::is_jar_file() {
322 return ((_st.st_mode & S_IFREG) == S_IFREG);
323 }
324
325 ClassPathEntry* LazyClassPathEntry::resolve_entry(TRAPS) {
326 if (_resolved_entry != NULL) {
327 return (ClassPathEntry*) _resolved_entry;
328 }
329 ClassPathEntry* new_entry = NULL;
330 new_entry = ClassLoader::create_class_path_entry(_path, &_st, false, _throw_exception, CHECK_NULL);
331 if (!_throw_exception && new_entry == NULL) {
332 assert(!HAS_PENDING_EXCEPTION, "must be");
333 return NULL;
334 }
335 {
336 ThreadCritical tc;
337 if (_resolved_entry == NULL) {
338 _resolved_entry = new_entry;
339 return new_entry;
340 }
341 }
342 assert(_resolved_entry != NULL, "bug in MT-safe resolution logic");
343 delete new_entry;
344 return (ClassPathEntry*) _resolved_entry;
345 }
346
347 ClassFileStream* LazyClassPathEntry::open_stream(const char* name, TRAPS) {
348 if (_meta_index != NULL &&
349 !_meta_index->may_contain(name)) {
350 return NULL;
351 }
352 if (_has_error) {
353 return NULL;
354 }
355 ClassPathEntry* cpe = resolve_entry(THREAD);
356 if (cpe == NULL) {
357 _has_error = true;
358 return NULL;
359 } else {
360 return cpe->open_stream(name, THREAD);
361 }
362 }
363
364 bool LazyClassPathEntry::is_lazy() {
365 return true;
366 }
367
368 u1* LazyClassPathEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
369 if (_has_error) {
370 return NULL;
371 }
372 ClassPathEntry* cpe = resolve_entry(THREAD);
373 if (cpe == NULL) {
374 _has_error = true;
375 return NULL;
376 } else if (cpe->is_jar_file()) {
377 return ((ClassPathZipEntry*)cpe)->open_entry(name, filesize, nul_terminate,THREAD);
378 } else {
379 ShouldNotReachHere();
380 *filesize = 0;
381 return NULL;
382 }
383 }
384
385 static void print_meta_index(LazyClassPathEntry* entry,
386 GrowableArray<char*>& meta_packages) {
387 tty->print("[Meta index for %s=", entry->name());
388 for (int i = 0; i < meta_packages.length(); i++) {
389 if (i > 0) tty->print(" ");
390 tty->print("%s", meta_packages.at(i));
391 }
392 tty->print_cr("]");
393 }
394
395 #if INCLUDE_CDS
396 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
397 assert(DumpSharedSpaces, "only called at dump time");
398 tty->print_cr("Hint: enable -XX:+TraceClassPaths to diagnose the failure");
399 vm_exit_during_initialization(error, message);
400 }
401 #endif
402
403 void ClassLoader::trace_class_path(const char* msg, const char* name) {
404 if (!TraceClassPaths) {
405 return;
406 }
407
408 if (msg) {
409 tty->print("%s", msg);
410 }
411 if (name) {
412 if (strlen(name) < 256) {
413 tty->print("%s", name);
414 } else {
415 // For very long paths, we need to print each character separately,
416 // as print_cr() has a length limit
417 while (name[0] != '\0') {
418 tty->print("%c", name[0]);
419 name++;
420 }
421 }
422 }
423 if (msg && msg[0] == '[') {
424 tty->print_cr("]");
425 } else {
426 tty->cr();
427 }
428 }
429
430 void ClassLoader::setup_bootstrap_meta_index() {
431 // Set up meta index which allows us to open boot jars lazily if
432 // class data sharing is enabled
433 const char* meta_index_path = Arguments::get_meta_index_path();
434 const char* meta_index_dir = Arguments::get_meta_index_dir();
435 setup_meta_index(meta_index_path, meta_index_dir, 0);
436 }
437
438 void ClassLoader::setup_meta_index(const char* meta_index_path, const char* meta_index_dir, int start_index) {
439 const char* known_version = "% VERSION 2";
440 FILE* file = fopen(meta_index_path, "r");
441 int line_no = 0;
442 #if INCLUDE_CDS
443 if (DumpSharedSpaces) {
444 if (file != NULL) {
445 _shared_paths_misc_info->add_required_file(meta_index_path);
446 } else {
447 _shared_paths_misc_info->add_nonexist_path(meta_index_path);
448 }
449 }
450 #endif
451 if (file != NULL) {
452 ResourceMark rm;
453 LazyClassPathEntry* cur_entry = NULL;
454 GrowableArray<char*> boot_class_path_packages(10);
455 char package_name[256];
456 bool skipCurrentJar = false;
457 while (fgets(package_name, sizeof(package_name), file) != NULL) {
458 ++line_no;
459 // Remove trailing newline
460 package_name[strlen(package_name) - 1] = '\0';
461 switch(package_name[0]) {
462 case '%':
463 {
464 if ((line_no == 1) && (strcmp(package_name, known_version) != 0)) {
465 if (TraceClassLoading && Verbose) {
466 tty->print("[Unsupported meta index version]");
467 }
468 fclose(file);
469 return;
470 }
471 }
472
473 // These directives indicate jar files which contain only
474 // classes, only non-classfile resources, or a combination of
475 // the two. See src/share/classes/sun/misc/MetaIndex.java and
476 // make/tools/MetaIndex/BuildMetaIndex.java in the J2SE
477 // workspace.
478 case '#':
479 case '!':
480 case '@':
481 {
482 // Hand off current packages to current lazy entry (if any)
483 if ((cur_entry != NULL) &&
484 (boot_class_path_packages.length() > 0)) {
485 if ((TraceClassLoading || TraceClassPaths) && Verbose) {
486 print_meta_index(cur_entry, boot_class_path_packages);
487 }
488 MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
489 boot_class_path_packages.length());
490 cur_entry->set_meta_index(index);
491 }
492 cur_entry = NULL;
493 boot_class_path_packages.clear();
494
495 // Find lazy entry corresponding to this jar file
496 int count = 0;
497 for (ClassPathEntry* entry = _first_entry; entry != NULL; entry = entry->next(), count++) {
498 if (count >= start_index &&
499 entry->is_lazy() &&
500 string_starts_with(entry->name(), meta_index_dir) &&
501 string_ends_with(entry->name(), &package_name[2])) {
502 cur_entry = (LazyClassPathEntry*) entry;
503 break;
504 }
505 }
506
507 // If the first character is '@', it indicates the following jar
508 // file is a resource only jar file in which case, we should skip
509 // reading the subsequent entries since the resource loading is
510 // totally handled by J2SE side.
511 if (package_name[0] == '@') {
512 if (cur_entry != NULL) {
513 cur_entry->set_meta_index(new MetaIndex(NULL, 0));
514 }
515 cur_entry = NULL;
516 skipCurrentJar = true;
517 } else {
518 skipCurrentJar = false;
519 }
520
521 break;
522 }
523
524 default:
525 {
526 if (!skipCurrentJar && cur_entry != NULL) {
527 char* new_name = os::strdup_check_oom(package_name);
528 boot_class_path_packages.append(new_name);
529 }
530 }
531 }
532 }
533 // Hand off current packages to current lazy entry (if any)
534 if ((cur_entry != NULL) &&
535 (boot_class_path_packages.length() > 0)) {
536 if ((TraceClassLoading || TraceClassPaths) && Verbose) {
537 print_meta_index(cur_entry, boot_class_path_packages);
538 }
539 MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
540 boot_class_path_packages.length());
541 cur_entry->set_meta_index(index);
542 }
543 fclose(file);
544 }
545 }
546
547 #if INCLUDE_CDS
548 void ClassLoader::check_shared_classpath(const char *path) {
549 if (strcmp(path, "") == 0) {
550 exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
551 }
552
553 struct stat st;
554 if (os::stat(path, &st) == 0) {
555 if ((st.st_mode & S_IFREG) != S_IFREG) { // is directory
556 if (!os::dir_is_empty(path)) {
557 tty->print_cr("Error: non-empty directory '%s'", path);
558 exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL);
559 }
560 }
561 }
562 }
563 #endif
564
565 void ClassLoader::setup_bootstrap_search_path() {
566 assert(_first_entry == NULL, "should not setup bootstrap class search path twice");
567 char* sys_class_path = os::strdup_check_oom(Arguments::get_sysclasspath());
568 if (!PrintSharedArchiveAndExit) {
569 trace_class_path("[Bootstrap loader class path=", sys_class_path);
570 }
571 #if INCLUDE_CDS
572 if (DumpSharedSpaces) {
573 _shared_paths_misc_info->add_boot_classpath(Arguments::get_sysclasspath());
574 }
575 #endif
576 setup_search_path(sys_class_path);
577 os::free(sys_class_path);
578 }
579
580 #if INCLUDE_CDS
581 int ClassLoader::get_shared_paths_misc_info_size() {
582 return _shared_paths_misc_info->get_used_bytes();
583 }
584
585 void* ClassLoader::get_shared_paths_misc_info() {
586 return _shared_paths_misc_info->buffer();
587 }
588
589 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
590 SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
591 bool result = checker->check();
592 delete checker;
593 return result;
594 }
595 #endif
596
597 void ClassLoader::setup_search_path(char *class_path) {
598 int offset = 0;
599 int len = (int)strlen(class_path);
600 int end = 0;
601
602 // Iterate over class path entries
603 for (int start = 0; start < len; start = end) {
604 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
605 end++;
606 }
607 EXCEPTION_MARK;
608 ResourceMark rm(THREAD);
609 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
610 strncpy(path, &class_path[start], end - start);
611 path[end - start] = '\0';
612 update_class_path_entry_list(path, false);
613 #if INCLUDE_CDS
614 if (DumpSharedSpaces) {
615 check_shared_classpath(path);
616 }
617 #endif
618 while (class_path[end] == os::path_separator()[0]) {
619 end++;
620 }
621 }
622 }
623
624 ClassPathEntry* ClassLoader::create_class_path_entry(char *path, const struct stat* st,
625 bool lazy, bool throw_exception, TRAPS) {
626 JavaThread* thread = JavaThread::current();
627 if (lazy) {
628 return new LazyClassPathEntry(path, st, throw_exception);
629 }
630 ClassPathEntry* new_entry = NULL;
631 if ((st->st_mode & S_IFREG) == S_IFREG) {
632 // Regular file, should be a zip file
633 // Canonicalized filename
634 char canonical_path[JVM_MAXPATHLEN];
635 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
636 // This matches the classic VM
637 if (throw_exception) {
638 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
639 } else {
640 return NULL;
641 }
642 }
643 char* error_msg = NULL;
644 jzfile* zip;
645 {
646 // enable call to C land
647 ThreadToNativeFromVM ttn(thread);
648 HandleMark hm(thread);
649 zip = (*ZipOpen)(canonical_path, &error_msg);
650 }
651 if (zip != NULL && error_msg == NULL) {
652 new_entry = new ClassPathZipEntry(zip, path);
653 if (TraceClassLoading || TraceClassPaths) {
654 tty->print_cr("[Opened %s]", path);
655 }
656 } else {
657 ResourceMark rm(thread);
658 char *msg;
659 if (error_msg == NULL) {
660 msg = NEW_RESOURCE_ARRAY(char, strlen(path) + 128); ;
661 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
662 } else {
663 int len = (int)(strlen(path) + strlen(error_msg) + 128);
664 msg = NEW_RESOURCE_ARRAY(char, len); ;
665 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
666 }
667 if (throw_exception) {
668 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
669 } else {
670 return NULL;
671 }
672 }
673 } else {
674 // Directory
675 new_entry = new ClassPathDirEntry(path);
676 if (TraceClassLoading || TraceClassPaths) {
677 tty->print_cr("[Path %s]", path);
678 }
679 }
680 return new_entry;
681 }
682
683
684 // Create a class path zip entry for a given path (return NULL if not found
685 // or zip/JAR file cannot be opened)
686 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) {
687 // check for a regular file
688 struct stat st;
689 if (os::stat(path, &st) == 0) {
690 if ((st.st_mode & S_IFREG) == S_IFREG) {
691 char orig_path[JVM_MAXPATHLEN];
692 char canonical_path[JVM_MAXPATHLEN];
693
694 strcpy(orig_path, path);
695 if (get_canonical_path(orig_path, canonical_path, JVM_MAXPATHLEN)) {
696 char* error_msg = NULL;
697 jzfile* zip;
698 {
699 // enable call to C land
700 JavaThread* thread = JavaThread::current();
701 ThreadToNativeFromVM ttn(thread);
702 HandleMark hm(thread);
703 zip = (*ZipOpen)(canonical_path, &error_msg);
704 }
705 if (zip != NULL && error_msg == NULL) {
706 // create using canonical path
707 return new ClassPathZipEntry(zip, canonical_path);
708 }
709 }
710 }
711 }
712 return NULL;
713 }
714
715 // returns true if entry already on class path
716 bool ClassLoader::contains_entry(ClassPathEntry *entry) {
717 ClassPathEntry* e = _first_entry;
718 while (e != NULL) {
719 // assume zip entries have been canonicalized
720 if (strcmp(entry->name(), e->name()) == 0) {
721 return true;
722 }
723 e = e->next();
724 }
725 return false;
726 }
727
728 void ClassLoader::add_to_list(ClassPathEntry *new_entry) {
729 if (new_entry != NULL) {
730 if (_last_entry == NULL) {
731 _first_entry = _last_entry = new_entry;
732 } else {
733 _last_entry->set_next(new_entry);
734 _last_entry = new_entry;
735 }
736 }
737 _num_entries ++;
738 }
739
740 // Returns true IFF the file/dir exists and the entry was successfully created.
741 bool ClassLoader::update_class_path_entry_list(char *path,
742 bool check_for_duplicates,
743 bool throw_exception) {
744 struct stat st;
745 if (os::stat(path, &st) == 0) {
746 // File or directory found
747 ClassPathEntry* new_entry = NULL;
748 Thread* THREAD = Thread::current();
749 new_entry = create_class_path_entry(path, &st, LazyBootClassLoader, throw_exception, CHECK_(false));
750 if (new_entry == NULL) {
751 return false;
752 }
753 // The kernel VM adds dynamically to the end of the classloader path and
754 // doesn't reorder the bootclasspath which would break java.lang.Package
755 // (see PackageInfo).
756 // Add new entry to linked list
757 if (!check_for_duplicates || !contains_entry(new_entry)) {
758 ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry);
759 }
760 return true;
761 } else {
762 #if INCLUDE_CDS
763 if (DumpSharedSpaces) {
764 _shared_paths_misc_info->add_nonexist_path(path);
765 }
766 return false;
767 #endif
768 }
769 }
770
771 void ClassLoader::print_bootclasspath() {
772 ClassPathEntry* e = _first_entry;
773 tty->print("[bootclasspath= ");
774 while (e != NULL) {
775 tty->print("%s ;", e->name());
776 e = e->next();
777 }
778 tty->print_cr("]");
779 }
780
781 void ClassLoader::load_zip_library() {
782 assert(ZipOpen == NULL, "should not load zip library twice");
783 // First make sure native library is loaded
784 os::native_java_library();
785 // Load zip library
786 char path[JVM_MAXPATHLEN];
787 char ebuf[1024];
788 void* handle = NULL;
789 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
790 handle = os::dll_load(path, ebuf, sizeof ebuf);
791 }
792 if (handle == NULL) {
793 vm_exit_during_initialization("Unable to load ZIP library", path);
794 }
795 // Lookup zip entry points
796 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
797 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
798 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
799 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
800 ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, os::dll_lookup(handle, "ZIP_ReadMappedEntry"));
801 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
802
803 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
804 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL || GetNextEntry == NULL) {
805 vm_exit_during_initialization("Corrupted ZIP library", path);
806 }
807
808 // Lookup canonicalize entry in libjava.dll
809 void *javalib_handle = os::native_java_library();
810 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
811 // This lookup only works on 1.3. Do not check for non-null here
812 }
813
814 // PackageInfo data exists in order to support the java.lang.Package
815 // class. A Package object provides information about a java package
816 // (version, vendor, etc.) which originates in the manifest of the jar
817 // file supplying the package. For application classes, the ClassLoader
818 // object takes care of this.
819
820 // For system (boot) classes, the Java code in the Package class needs
821 // to be able to identify which source jar file contained the boot
822 // class, so that it can extract the manifest from it. This table
823 // identifies java packages with jar files in the boot classpath.
824
825 // Because the boot classpath cannot change, the classpath index is
826 // sufficient to identify the source jar file or directory. (Since
827 // directories have no manifests, the directory name is not required,
828 // but is available.)
829
830 // When using sharing -- the pathnames of entries in the boot classpath
831 // may not be the same at runtime as they were when the archive was
832 // created (NFS, Samba, etc.). The actual files and directories named
833 // in the classpath must be the same files, in the same order, even
834 // though the exact name is not the same.
835
836 class PackageInfo: public BasicHashtableEntry<mtClass> {
837 public:
838 const char* _pkgname; // Package name
839 int _classpath_index; // Index of directory or JAR file loaded from
840
841 PackageInfo* next() {
842 return (PackageInfo*)BasicHashtableEntry<mtClass>::next();
843 }
844
845 const char* pkgname() { return _pkgname; }
846 void set_pkgname(char* pkgname) { _pkgname = pkgname; }
847
848 const char* filename() {
849 return ClassLoader::classpath_entry(_classpath_index)->name();
850 }
851
852 void set_index(int index) {
853 _classpath_index = index;
854 }
855 };
856
857
858 class PackageHashtable : public BasicHashtable<mtClass> {
859 private:
860 inline unsigned int compute_hash(const char *s, int n) {
861 unsigned int val = 0;
862 while (--n >= 0) {
863 val = *s++ + 31 * val;
864 }
865 return val;
866 }
867
868 PackageInfo* bucket(int index) {
869 return (PackageInfo*)BasicHashtable<mtClass>::bucket(index);
870 }
871
872 PackageInfo* get_entry(int index, unsigned int hash,
873 const char* pkgname, size_t n) {
874 for (PackageInfo* pp = bucket(index); pp != NULL; pp = pp->next()) {
875 if (pp->hash() == hash &&
876 strncmp(pkgname, pp->pkgname(), n) == 0 &&
877 pp->pkgname()[n] == '\0') {
878 return pp;
879 }
880 }
881 return NULL;
882 }
883
884 public:
885 PackageHashtable(int table_size)
886 : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo)) {}
887
888 PackageHashtable(int table_size, HashtableBucket<mtClass>* t, int number_of_entries)
889 : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo), t, number_of_entries) {}
890
891 PackageInfo* get_entry(const char* pkgname, int n) {
892 unsigned int hash = compute_hash(pkgname, n);
893 return get_entry(hash_to_index(hash), hash, pkgname, n);
894 }
895
896 PackageInfo* new_entry(char* pkgname, int n) {
897 unsigned int hash = compute_hash(pkgname, n);
898 PackageInfo* pp;
899 pp = (PackageInfo*)BasicHashtable<mtClass>::new_entry(hash);
900 pp->set_pkgname(pkgname);
901 return pp;
902 }
903
904 void add_entry(PackageInfo* pp) {
905 int index = hash_to_index(pp->hash());
906 BasicHashtable<mtClass>::add_entry(index, pp);
907 }
908
909 void copy_pkgnames(const char** packages) {
910 int n = 0;
911 for (int i = 0; i < table_size(); ++i) {
912 for (PackageInfo* pp = bucket(i); pp != NULL; pp = pp->next()) {
913 packages[n++] = pp->pkgname();
914 }
915 }
916 assert(n == number_of_entries(), "just checking");
917 }
918
919 CDS_ONLY(void copy_table(char** top, char* end, PackageHashtable* table);)
920 };
921
922 #if INCLUDE_CDS
923 void PackageHashtable::copy_table(char** top, char* end,
924 PackageHashtable* table) {
925 // Copy (relocate) the table to the shared space.
926 BasicHashtable<mtClass>::copy_table(top, end);
927
928 // Calculate the space needed for the package name strings.
929 int i;
930 intptr_t* tableSize = (intptr_t*)(*top);
931 *top += sizeof(intptr_t); // For table size
932 char* tableStart = *top;
933
934 for (i = 0; i < table_size(); ++i) {
935 for (PackageInfo* pp = table->bucket(i);
936 pp != NULL;
937 pp = pp->next()) {
938 int n1 = (int)(strlen(pp->pkgname()) + 1);
939 if (*top + n1 >= end) {
940 report_out_of_shared_space(SharedMiscData);
941 }
942 pp->set_pkgname((char*)memcpy(*top, pp->pkgname(), n1));
943 *top += n1;
944 }
945 }
946 *top = (char*)align_size_up((intptr_t)*top, sizeof(HeapWord));
947 if (*top >= end) {
948 report_out_of_shared_space(SharedMiscData);
949 }
950
951 // Write table size
952 intptr_t len = *top - (char*)tableStart;
953 *tableSize = len;
954 }
955
956
957 void ClassLoader::copy_package_info_buckets(char** top, char* end) {
958 _package_hash_table->copy_buckets(top, end);
959 }
960
961 void ClassLoader::copy_package_info_table(char** top, char* end) {
962 _package_hash_table->copy_table(top, end, _package_hash_table);
963 }
964 #endif
965
966 PackageInfo* ClassLoader::lookup_package(const char *pkgname) {
967 const char *cp = strrchr(pkgname, '/');
968 if (cp != NULL) {
969 // Package prefix found
970 int n = cp - pkgname + 1;
971 return _package_hash_table->get_entry(pkgname, n);
972 }
973 return NULL;
974 }
975
976
977 bool ClassLoader::add_package(const char *pkgname, int classpath_index, TRAPS) {
978 assert(pkgname != NULL, "just checking");
979 // Bootstrap loader no longer holds system loader lock obj serializing
980 // load_instance_class and thereby add_package
981 {
982 MutexLocker ml(PackageTable_lock, THREAD);
983 // First check for previously loaded entry
984 PackageInfo* pp = lookup_package(pkgname);
985 if (pp != NULL) {
986 // Existing entry found, check source of package
987 pp->set_index(classpath_index);
988 return true;
989 }
990
991 const char *cp = strrchr(pkgname, '/');
992 if (cp != NULL) {
993 // Package prefix found
994 int n = cp - pkgname + 1;
995
996 char* new_pkgname = NEW_C_HEAP_ARRAY(char, n + 1, mtClass);
997 if (new_pkgname == NULL) {
998 return false;
999 }
1000
1001 memcpy(new_pkgname, pkgname, n);
1002 new_pkgname[n] = '\0';
1003 pp = _package_hash_table->new_entry(new_pkgname, n);
1004 pp->set_index(classpath_index);
1005
1006 // Insert into hash table
1007 _package_hash_table->add_entry(pp);
1008 }
1009 return true;
1010 }
1011 }
1012
1013
1014 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1015 PackageInfo* pp;
1016 {
1017 MutexLocker ml(PackageTable_lock, THREAD);
1018 pp = lookup_package(name);
1019 }
1020 if (pp == NULL) {
1021 return NULL;
1022 } else {
1023 Handle p = java_lang_String::create_from_str(pp->filename(), THREAD);
1024 return p();
1025 }
1026 }
1027
1028
1029 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1030 ResourceMark rm(THREAD);
1031 int nof_entries;
1032 const char** packages;
1033 {
1034 MutexLocker ml(PackageTable_lock, THREAD);
1035 // Allocate resource char* array containing package names
1036 nof_entries = _package_hash_table->number_of_entries();
1037 if ((packages = NEW_RESOURCE_ARRAY(const char*, nof_entries)) == NULL) {
1038 return NULL;
1039 }
1040 _package_hash_table->copy_pkgnames(packages);
1041 }
1042 // Allocate objArray and fill with java.lang.String
1043 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1044 nof_entries, CHECK_0);
1045 objArrayHandle result(THREAD, r);
1046 for (int i = 0; i < nof_entries; i++) {
1047 Handle str = java_lang_String::create_from_str(packages[i], CHECK_0);
1048 result->obj_at_put(i, str());
1049 }
1050
1051 return result();
1052 }
1053
1054
1055 instanceKlassHandle ClassLoader::load_classfile(Symbol* h_name, TRAPS) {
1056 ResourceMark rm(THREAD);
1057 const char* class_name = h_name->as_C_string();
1058 EventMark m("loading class %s", class_name);
1059 ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion);
1060
1061 stringStream st;
1062 // st.print() uses too much stack space while handling a StackOverflowError
1063 // st.print("%s.class", h_name->as_utf8());
1064 st.print_raw(h_name->as_utf8());
1065 st.print_raw(".class");
1066 const char* file_name = st.as_string();
1067 ClassLoaderExt::Context context(class_name, file_name, THREAD);
1068
1069 // Lookup stream for parsing .class file
1070 ClassFileStream* stream = NULL;
1071 int classpath_index = 0;
1072 ClassPathEntry* e = NULL;
1073 instanceKlassHandle h;
1074 {
1075 PerfClassTraceTime vmtimer(perf_sys_class_lookup_time(),
1076 ((JavaThread*) THREAD)->get_thread_stat()->perf_timers_addr(),
1077 PerfClassTraceTime::CLASS_LOAD);
1078 e = _first_entry;
1079 while (e != NULL) {
1080 stream = e->open_stream(file_name, CHECK_NULL);
1081 if (!context.check(stream, classpath_index)) {
1082 return h; // NULL
1083 }
1084 if (stream != NULL) {
1085 break;
1086 }
1087 e = e->next();
1088 ++classpath_index;
1089 }
1090 }
1091
1092 if (stream != NULL) {
1093 // class file found, parse it
1094 ClassFileParser parser(stream);
1095 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1096 Handle protection_domain;
1097 TempNewSymbol parsed_name = NULL;
1098 instanceKlassHandle result = parser.parseClassFile(h_name,
1099 loader_data,
1100 protection_domain,
1101 parsed_name,
1102 context.should_verify(classpath_index),
1103 THREAD);
1104 if (HAS_PENDING_EXCEPTION) {
1105 ResourceMark rm;
1106 if (DumpSharedSpaces) {
1107 tty->print_cr("Preload Error: Failed to load %s", class_name);
1108 }
1109 return h;
1110 }
1111 h = context.record_result(classpath_index, e, result, THREAD);
1112 } else {
1113 if (DumpSharedSpaces) {
1114 tty->print_cr("Preload Error: Cannot find %s", class_name);
1115 }
1116 }
1117
1118 return h;
1119 }
1120
1121
1122 void ClassLoader::create_package_info_table(HashtableBucket<mtClass> *t, int length,
1123 int number_of_entries) {
1124 assert(_package_hash_table == NULL, "One package info table allowed.");
1125 assert(length == package_hash_table_size * sizeof(HashtableBucket<mtClass>),
1126 "bad shared package info size.");
1127 _package_hash_table = new PackageHashtable(package_hash_table_size, t,
1128 number_of_entries);
1129 }
1130
1131
1132 void ClassLoader::create_package_info_table() {
1133 assert(_package_hash_table == NULL, "shouldn't have one yet");
1134 _package_hash_table = new PackageHashtable(package_hash_table_size);
1135 }
1136
1137
1138 // Initialize the class loader's access to methods in libzip. Parse and
1139 // process the boot classpath into a list ClassPathEntry objects. Once
1140 // this list has been created, it must not change order (see class PackageInfo)
1141 // it can be appended to and is by jvmti and the kernel vm.
1142
1143 void ClassLoader::initialize() {
1144 assert(_package_hash_table == NULL, "should have been initialized by now.");
1145 EXCEPTION_MARK;
1146
1147 if (UsePerfData) {
1148 // jvmstat performance counters
1149 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1150 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1151 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1152 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1153 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1154 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1155 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1156 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1157 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1158 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1159
1160 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1161 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1162 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1163 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1164 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1165 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1166 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1167 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1168 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1169 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1170 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1171 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1172 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1173
1174
1175 // The following performance counters are added for measuring the impact
1176 // of the bug fix of 6365597. They are mainly focused on finding out
1177 // the behavior of system & user-defined classloader lock, whether
1178 // ClassLoader.loadClass/findClass is being called synchronized or not.
1179 // Also two additional counters are created to see whether 'UnsyncloadClass'
1180 // flag is being set or not and how many times load_instance_class call
1181 // fails with linkageError etc.
1182 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1183 "systemLoaderLockContentionRate");
1184 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1185 "nonSystemLoaderLockContentionRate");
1186 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1187 "jvmFindLoadedClassNoLockCalls");
1188 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1189 "jvmDefineClassNoLockCalls");
1190
1191 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1192 "jniDefineClassNoLockCalls");
1193
1194 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1195 "unsafeDefineClassCalls");
1196
1197 NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet");
1198 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1199 "loadInstanceClassFailRate");
1200
1201 // increment the isUnsyncloadClass counter if UnsyncloadClass is set.
1202 if (UnsyncloadClass) {
1203 _isUnsyncloadClass->inc();
1204 }
1205 }
1206
1207 // lookup zip library entry points
1208 load_zip_library();
1209 #if INCLUDE_CDS
1210 // initialize search path
1211 if (DumpSharedSpaces) {
1212 _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
1213 }
1214 #endif
1215 setup_bootstrap_search_path();
1216 if (LazyBootClassLoader) {
1217 // set up meta index which makes boot classpath initialization lazier
1218 setup_bootstrap_meta_index();
1219 }
1220 }
1221
1222 #if INCLUDE_CDS
1223 void ClassLoader::initialize_shared_path() {
1224 if (DumpSharedSpaces) {
1225 ClassLoaderExt::setup_search_paths();
1226 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1227 }
1228 }
1229 #endif
1230
1231 jlong ClassLoader::classloader_time_ms() {
1232 return UsePerfData ?
1233 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1234 }
1235
1236 jlong ClassLoader::class_init_count() {
1237 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1238 }
1239
1240 jlong ClassLoader::class_init_time_ms() {
1241 return UsePerfData ?
1242 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1243 }
1244
1245 jlong ClassLoader::class_verify_time_ms() {
1246 return UsePerfData ?
1247 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1248 }
1249
1250 jlong ClassLoader::class_link_count() {
1251 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1252 }
1253
1254 jlong ClassLoader::class_link_time_ms() {
1255 return UsePerfData ?
1256 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1257 }
1258
1259 int ClassLoader::compute_Object_vtable() {
1260 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1261 // code to determine actual value from file
1262 // Would be value '11' if finals were in vtable
1263 int JDK_1_2_Object_vtable_size = 5;
1264 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1265 }
1266
1267
1268 void classLoader_init() {
1269 ClassLoader::initialize();
1270 }
1271
1272
1273 bool ClassLoader::get_canonical_path(char* orig, char* out, int len) {
1274 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1275 if (CanonicalizeEntry != NULL) {
1276 JNIEnv* env = JavaThread::current()->jni_environment();
1277 if ((CanonicalizeEntry)(env, os::native_path(orig), out, len) < 0) {
1278 return false;
1279 }
1280 } else {
1281 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1282 strncpy(out, orig, len);
1283 out[len - 1] = '\0';
1284 }
1285 return true;
1286 }
1287
1288 #ifndef PRODUCT
1289
1290 void ClassLoader::verify() {
1291 _package_hash_table->verify();
1292 }
1293
1294
1295 // CompileTheWorld
1296 //
1297 // Iterates over all class path entries and forces compilation of all methods
1298 // in all classes found. Currently, only zip/jar archives are searched.
1299 //
1300 // The classes are loaded by the Java level bootstrap class loader, and the
1301 // initializer is called. If DelayCompilationDuringStartup is true (default),
1302 // the interpreter will run the initialization code. Note that forcing
1303 // initialization in this way could potentially lead to initialization order
1304 // problems, in which case we could just force the initialization bit to be set.
1305
1306
1307 // We need to iterate over the contents of a zip/jar file, so we replicate the
1308 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1309 // since jzfile already has a void* definition.
1310 //
1311 // Note that this is only used in debug mode.
1312 //
1313 // HotSpot integration note:
1314 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1315
1316
1317 // JDK 1.3 version
1318 typedef struct real_jzentry { /* Zip file entry */
1319 char *name; /* entry name */
1320 jint time; /* modification time */
1321 jint size; /* size of uncompressed data */
1322 jint csize; /* size of compressed data (zero if uncompressed) */
1323 jint crc; /* crc of uncompressed data */
1324 char *comment; /* optional zip file comment */
1325 jbyte *extra; /* optional extra data */
1326 jint pos; /* position of LOC header (if negative) or data */
1327 } real_jzentry;
1328
1329 typedef struct real_jzfile { /* Zip file */
1330 char *name; /* zip file name */
1331 jint refs; /* number of active references */
1332 jint fd; /* open file descriptor */
1333 void *lock; /* read lock */
1334 char *comment; /* zip file comment */
1335 char *msg; /* zip error message */
1336 void *entries; /* array of hash cells */
1337 jint total; /* total number of entries */
1338 unsigned short *table; /* Hash chain heads: indexes into entries */
1339 jint tablelen; /* number of hash eads */
1340 real_jzfile *next; /* next zip file in search list */
1341 jzentry *cache; /* we cache the most recently freed jzentry */
1342 /* Information on metadata names in META-INF directory */
1343 char **metanames; /* array of meta names (may have null names) */
1344 jint metacount; /* number of slots in metanames array */
1345 /* If there are any per-entry comments, they are in the comments array */
1346 char **comments;
1347 } real_jzfile;
1348
1349 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1350 // For now we only compile all methods in all classes in zip/jar files
1351 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1352 tty->cr();
1353 }
1354
1355
1356 bool ClassPathDirEntry::is_rt_jar() {
1357 return false;
1358 }
1359
1360 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1361 real_jzfile* zip = (real_jzfile*) _zip;
1362 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1363 tty->cr();
1364 // Iterate over all entries in zip file
1365 for (int n = 0; ; n++) {
1366 real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n));
1367 if (ze == NULL) break;
1368 ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1369 }
1370 if (HAS_PENDING_EXCEPTION) {
1371 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1372 CLEAR_PENDING_EXCEPTION;
1373 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1374 tty->print_cr("Increase class metadata storage if a limit was set");
1375 } else {
1376 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1377 }
1378 }
1379 }
1380
1381 bool ClassPathZipEntry::is_rt_jar() {
1382 real_jzfile* zip = (real_jzfile*) _zip;
1383 int len = (int)strlen(zip->name);
1384 // Check whether zip name ends in "rt.jar"
1385 // This will match other archives named rt.jar as well, but this is
1386 // only used for debugging.
1387 return (len >= 6) && (strcasecmp(zip->name + len - 6, "rt.jar") == 0);
1388 }
1389
1390 void LazyClassPathEntry::compile_the_world(Handle loader, TRAPS) {
1391 ClassPathEntry* cpe = resolve_entry(THREAD);
1392 if (cpe != NULL) {
1393 cpe->compile_the_world(loader, CHECK);
1394 }
1395 }
1396
1397 bool LazyClassPathEntry::is_rt_jar() {
1398 Thread* THREAD = Thread::current();
1399 ClassPathEntry* cpe = resolve_entry(THREAD);
1400 return (cpe != NULL) ? cpe->is_jar_file() : false;
1401 }
1402
1403 void ClassLoader::compile_the_world() {
1404 EXCEPTION_MARK;
1405 HandleMark hm(THREAD);
1406 ResourceMark rm(THREAD);
1407 // Make sure we don't run with background compilation
1408 BackgroundCompilation = false;
1409 // Find bootstrap loader
1410 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1411 // Iterate over all bootstrap class path entries
1412 ClassPathEntry* e = _first_entry;
1413 jlong start = os::javaTimeMillis();
1414 while (e != NULL) {
1415 // We stop at rt.jar, unless it is the first bootstrap path entry
1416 if (e->is_rt_jar() && e != _first_entry) break;
1417 e->compile_the_world(system_class_loader, CATCH);
1418 e = e->next();
1419 }
1420 jlong end = os::javaTimeMillis();
1421 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1422 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1423 {
1424 // Print statistics as if before normal exit:
1425 extern void print_statistics();
1426 print_statistics();
1427 }
1428 vm_exit(0);
1429 }
1430
1431 int ClassLoader::_compile_the_world_class_counter = 0;
1432 int ClassLoader::_compile_the_world_method_counter = 0;
1433 static int _codecache_sweep_counter = 0;
1434
1435 // Filter out all exceptions except OOMs
1436 static void clear_pending_exception_if_not_oom(TRAPS) {
1437 if (HAS_PENDING_EXCEPTION &&
1438 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1439 CLEAR_PENDING_EXCEPTION;
1440 }
1441 // The CHECK at the caller will propagate the exception out
1442 }
1443
1444 /**
1445 * Returns if the given method should be compiled when doing compile-the-world.
1446 *
1447 * TODO: This should be a private method in a CompileTheWorld class.
1448 */
1449 static bool can_be_compiled(methodHandle m, int comp_level) {
1450 assert(CompileTheWorld, "must be");
1451
1452 // It's not valid to compile a native wrapper for MethodHandle methods
1453 // that take a MemberName appendix since the bytecode signature is not
1454 // correct.
1455 vmIntrinsics::ID iid = m->intrinsic_id();
1456 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1457 return false;
1458 }
1459
1460 return CompilationPolicy::can_be_compiled(m, comp_level);
1461 }
1462
1463 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1464 int len = (int)strlen(name);
1465 if (len > 6 && strcmp(".class", name + len - 6) == 0) {
1466 // We have a .class file
1467 char buffer[2048];
1468 strncpy(buffer, name, len - 6);
1469 buffer[len-6] = 0;
1470 // If the file has a period after removing .class, it's not really a
1471 // valid class file. The class loader will check everything else.
1472 if (strchr(buffer, '.') == NULL) {
1473 _compile_the_world_class_counter++;
1474 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
1475
1476 // Construct name without extension
1477 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
1478 // Use loader to load and initialize class
1479 Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
1480 instanceKlassHandle k (THREAD, ik);
1481 if (k.not_null() && !HAS_PENDING_EXCEPTION) {
1482 k->initialize(THREAD);
1483 }
1484 bool exception_occurred = HAS_PENDING_EXCEPTION;
1485 clear_pending_exception_if_not_oom(CHECK);
1486 if (CompileTheWorldPreloadClasses && k.not_null()) {
1487 ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD);
1488 if (HAS_PENDING_EXCEPTION) {
1489 // If something went wrong in preloading we just ignore it
1490 clear_pending_exception_if_not_oom(CHECK);
1491 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
1492 }
1493 }
1494
1495 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
1496 if (k.is_null() || exception_occurred) {
1497 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
1498 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
1499 } else {
1500 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
1501 // Preload all classes to get around uncommon traps
1502 // Iterate over all methods in class
1503 int comp_level = CompilationPolicy::policy()->initial_compile_level();
1504 for (int n = 0; n < k->methods()->length(); n++) {
1505 methodHandle m (THREAD, k->methods()->at(n));
1506 if (can_be_compiled(m, comp_level)) {
1507 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
1508 // Give sweeper a chance to keep up with CTW
1509 VM_ForceSafepoint op;
1510 VMThread::execute(&op);
1511 _codecache_sweep_counter = 0;
1512 }
1513 // Force compilation
1514 CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
1515 methodHandle(), 0, "CTW", THREAD);
1516 if (HAS_PENDING_EXCEPTION) {
1517 clear_pending_exception_if_not_oom(CHECK);
1518 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1519 } else {
1520 _compile_the_world_method_counter++;
1521 }
1522 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
1523 // Clobber the first compile and force second tier compilation
1524 nmethod* nm = m->code();
1525 if (nm != NULL) {
1526 // Throw out the code so that the code cache doesn't fill up
1527 nm->make_not_entrant();
1528 m->clear_code();
1529 }
1530 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
1531 methodHandle(), 0, "CTW", THREAD);
1532 if (HAS_PENDING_EXCEPTION) {
1533 clear_pending_exception_if_not_oom(CHECK);
1534 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1535 } else {
1536 _compile_the_world_method_counter++;
1537 }
1538 }
1539 } else {
1540 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1541 }
1542
1543 nmethod* nm = m->code();
1544 if (nm != NULL) {
1545 // Throw out the code so that the code cache doesn't fill up
1546 nm->make_not_entrant();
1547 m->clear_code();
1548 }
1549 }
1550 }
1551 }
1552 }
1553 }
1554 }
1555
1556 #endif //PRODUCT
1557
1558 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1559 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1560 void PerfClassTraceTime::initialize() {
1561 if (!UsePerfData) return;
1562
1563 if (_eventp != NULL) {
1564 // increment the event counter
1565 _eventp->inc();
1566 }
1567
1568 // stop the current active thread-local timer to measure inclusive time
1569 _prev_active_event = -1;
1570 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1571 if (_timers[i].is_active()) {
1572 assert(_prev_active_event == -1, "should have only one active timer");
1573 _prev_active_event = i;
1574 _timers[i].stop();
1575 }
1576 }
1577
1578 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1579 // start the inclusive timer if not recursively called
1580 _t.start();
1581 }
1582
1583 // start thread-local timer of the given event type
1584 if (!_timers[_event_type].is_active()) {
1585 _timers[_event_type].start();
1586 }
1587 }
1588
1589 PerfClassTraceTime::~PerfClassTraceTime() {
1590 if (!UsePerfData) return;
1591
1592 // stop the thread-local timer as the event completes
1593 // and resume the thread-local timer of the event next on the stack
1594 _timers[_event_type].stop();
1595 jlong selftime = _timers[_event_type].ticks();
1596
1597 if (_prev_active_event >= 0) {
1598 _timers[_prev_active_event].start();
1599 }
1600
1601 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1602
1603 // increment the counters only on the leaf call
1604 _t.stop();
1605 _timep->inc(_t.ticks());
1606 if (_selftimep != NULL) {
1607 _selftimep->inc(selftime);
1608 }
1609 // add all class loading related event selftime to the accumulated time counter
1610 ClassLoader::perf_accumulated_time()->inc(selftime);
1611
1612 // reset the timer
1613 _timers[_event_type].reset();
1614 }