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/threadCritical.hpp"
62 #include "runtime/timer.hpp"
63 #include "services/management.hpp"
64 #include "services/threadService.hpp"
65 #include "utilities/events.hpp"
66 #include "utilities/hashtable.hpp"
67 #include "utilities/hashtable.inline.hpp"
68 #ifdef TARGET_OS_FAMILY_linux
69 # include "os_linux.inline.hpp"
70 #endif
71 #ifdef TARGET_OS_FAMILY_solaris
72 # include "os_solaris.inline.hpp"
73 #endif
74 #ifdef TARGET_OS_FAMILY_windows
75 # include "os_windows.inline.hpp"
76 #endif
77 #ifdef TARGET_OS_FAMILY_aix
78 # include "os_aix.inline.hpp"
79 #endif
80 #ifdef TARGET_OS_FAMILY_bsd
81 # include "os_bsd.inline.hpp"
82 #endif
83
84
85 // Entry points in zip.dll for loading zip/jar file entries
86
87 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg);
88 typedef void (JNICALL *ZipClose_t)(jzfile *zip);
89 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
90 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
91 typedef jboolean (JNICALL *ReadMappedEntry_t)(jzfile *zip, jzentry *entry, unsigned char **buf, char *namebuf);
92 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n);
93 typedef jint (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len);
94
95 static ZipOpen_t ZipOpen = NULL;
96 static ZipClose_t ZipClose = NULL;
97 static FindEntry_t FindEntry = NULL;
98 static ReadEntry_t ReadEntry = NULL;
99 static ReadMappedEntry_t ReadMappedEntry = NULL;
100 static GetNextEntry_t GetNextEntry = NULL;
101 static canonicalize_fn_t CanonicalizeEntry = NULL;
102 static Crc32_t Crc32 = 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 PerfCounter* ClassLoader::_isUnsyncloadClass = NULL;
136 PerfCounter* ClassLoader::_load_instance_class_failCounter = NULL;
137
138 ClassPathEntry* ClassLoader::_first_entry = NULL;
139 ClassPathEntry* ClassLoader::_last_entry = NULL;
140 int ClassLoader::_num_entries = 0;
141 PackageHashtable* ClassLoader::_package_hash_table = NULL;
142
143 #if INCLUDE_CDS
144 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL;
145 #endif
146 // helper routines
147 bool string_starts_with(const char* str, const char* str_to_find) {
148 size_t str_len = strlen(str);
149 size_t str_to_find_len = strlen(str_to_find);
150 if (str_to_find_len > str_len) {
151 return false;
152 }
153 return (strncmp(str, str_to_find, str_to_find_len) == 0);
154 }
155
156 bool string_ends_with(const char* str, const char* str_to_find) {
157 size_t str_len = strlen(str);
158 size_t str_to_find_len = strlen(str_to_find);
159 if (str_to_find_len > str_len) {
160 return false;
161 }
162 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
163 }
164
165
166 MetaIndex::MetaIndex(char** meta_package_names, int num_meta_package_names) {
167 if (num_meta_package_names == 0) {
168 _meta_package_names = NULL;
169 _num_meta_package_names = 0;
170 } else {
171 _meta_package_names = NEW_C_HEAP_ARRAY(char*, num_meta_package_names, mtClass);
172 _num_meta_package_names = num_meta_package_names;
173 memcpy(_meta_package_names, meta_package_names, num_meta_package_names * sizeof(char*));
174 }
175 }
176
177
178 MetaIndex::~MetaIndex() {
179 FREE_C_HEAP_ARRAY(char*, _meta_package_names, mtClass);
180 }
181
182
183 bool MetaIndex::may_contain(const char* class_name) {
184 if ( _num_meta_package_names == 0) {
185 return false;
186 }
187 size_t class_name_len = strlen(class_name);
188 for (int i = 0; i < _num_meta_package_names; i++) {
189 char* pkg = _meta_package_names[i];
190 size_t pkg_len = strlen(pkg);
191 size_t min_len = MIN2(class_name_len, pkg_len);
192 if (!strncmp(class_name, pkg, min_len)) {
193 return true;
194 }
195 }
196 return false;
197 }
198
199
200 ClassPathEntry::ClassPathEntry() {
201 set_next(NULL);
202 }
203
204
205 bool ClassPathEntry::is_lazy() {
206 return false;
207 }
208
209 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() {
210 char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
211 strcpy(copy, dir);
212 _dir = copy;
213 }
214
215
216 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
217 // construct full path name
218 char path[JVM_MAXPATHLEN];
219 if (jio_snprintf(path, sizeof(path), "%s%s%s", _dir, os::file_separator(), name) == -1) {
220 return NULL;
221 }
222 // check if file exists
223 struct stat st;
224 if (os::stat(path, &st) == 0) {
225 #if INCLUDE_CDS
226 if (DumpSharedSpaces) {
227 // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so
228 // we should never find a file underneath it -- unless user has added a new file while we are running
229 // the dump, in which case let's quit!
230 ShouldNotReachHere();
231 }
232 #endif
233 // found file, open it
234 int file_handle = os::open(path, 0, 0);
235 if (file_handle != -1) {
236 // read contents into resource array
237 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
238 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
239 // close file
240 os::close(file_handle);
241 // construct ClassFileStream
242 if (num_read == (size_t)st.st_size) {
243 if (UsePerfData) {
244 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
245 }
246 return new ClassFileStream(buffer, st.st_size, _dir); // Resource allocated
247 }
248 }
249 }
250 return NULL;
251 }
252
253
254 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name) : ClassPathEntry() {
255 _zip = zip;
256 char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
257 strcpy(copy, zip_name);
258 _zip_name = copy;
259 }
260
261 ClassPathZipEntry::~ClassPathZipEntry() {
262 if (ZipClose != NULL) {
263 (*ZipClose)(_zip);
264 }
265 FREE_C_HEAP_ARRAY(char, _zip_name, mtClass);
266 }
267
268 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
269 // enable call to C land
270 JavaThread* thread = JavaThread::current();
271 ThreadToNativeFromVM ttn(thread);
272 // check whether zip archive contains name
273 jint name_len;
274 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
275 if (entry == NULL) return NULL;
276 u1* buffer;
277 char name_buf[128];
278 char* filename;
279 if (name_len < 128) {
280 filename = name_buf;
281 } else {
282 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
283 }
284
285 // file found, get pointer to the entry in mmapped jar file.
286 if (ReadMappedEntry == NULL ||
287 !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) {
288 // mmapped access not available, perhaps due to compression,
289 // read contents into resource array
290 int size = (*filesize) + ((nul_terminate) ? 1 : 0);
291 buffer = NEW_RESOURCE_ARRAY(u1, size);
292 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
293 }
294
295 // return result
296 if (nul_terminate) {
297 buffer[*filesize] = 0;
298 }
299 return buffer;
300 }
301
302 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
303 jint filesize;
304 u1* buffer = open_entry(name, &filesize, false, CHECK_NULL);
305 if (buffer == NULL) {
306 return NULL;
307 }
308 if (UsePerfData) {
309 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
310 }
311 return new ClassFileStream(buffer, filesize, _zip_name); // Resource allocated
312 }
313
314 // invoke function for each entry in the zip file
315 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
316 JavaThread* thread = JavaThread::current();
317 HandleMark handle_mark(thread);
318 ThreadToNativeFromVM ttn(thread);
319 for (int n = 0; ; n++) {
320 jzentry * ze = ((*GetNextEntry)(_zip, n));
321 if (ze == NULL) break;
322 (*f)(ze->name, context);
323 }
324 }
325
326 LazyClassPathEntry::LazyClassPathEntry(const char* path, const struct stat* st, bool throw_exception) : ClassPathEntry() {
327 _path = strdup(path);
328 _st = *st;
329 _meta_index = NULL;
330 _resolved_entry = NULL;
331 _has_error = false;
332 _throw_exception = throw_exception;
333 }
334
335 bool LazyClassPathEntry::is_jar_file() {
336 return ((_st.st_mode & S_IFREG) == S_IFREG);
337 }
338
339 ClassPathEntry* LazyClassPathEntry::resolve_entry(TRAPS) {
340 if (_resolved_entry != NULL) {
341 return (ClassPathEntry*) _resolved_entry;
342 }
343 ClassPathEntry* new_entry = NULL;
344 new_entry = ClassLoader::create_class_path_entry(_path, &_st, false, _throw_exception, CHECK_NULL);
345 if (!_throw_exception && new_entry == NULL) {
346 assert(!HAS_PENDING_EXCEPTION, "must be");
347 return NULL;
348 }
349 {
350 ThreadCritical tc;
351 if (_resolved_entry == NULL) {
352 _resolved_entry = new_entry;
353 return new_entry;
354 }
355 }
356 assert(_resolved_entry != NULL, "bug in MT-safe resolution logic");
357 delete new_entry;
358 return (ClassPathEntry*) _resolved_entry;
359 }
360
361 ClassFileStream* LazyClassPathEntry::open_stream(const char* name, TRAPS) {
362 if (_meta_index != NULL &&
363 !_meta_index->may_contain(name)) {
364 return NULL;
365 }
366 if (_has_error) {
367 return NULL;
368 }
369 ClassPathEntry* cpe = resolve_entry(THREAD);
370 if (cpe == NULL) {
371 _has_error = true;
372 return NULL;
373 } else {
374 return cpe->open_stream(name, THREAD);
375 }
376 }
377
378 bool LazyClassPathEntry::is_lazy() {
379 return true;
380 }
381
382 u1* LazyClassPathEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
383 if (_has_error) {
384 return NULL;
385 }
386 ClassPathEntry* cpe = resolve_entry(THREAD);
387 if (cpe == NULL) {
388 _has_error = true;
389 return NULL;
390 } else if (cpe->is_jar_file()) {
391 return ((ClassPathZipEntry*)cpe)->open_entry(name, filesize, nul_terminate,THREAD);
392 } else {
393 ShouldNotReachHere();
394 *filesize = 0;
395 return NULL;
396 }
397 }
398
399 static void print_meta_index(LazyClassPathEntry* entry,
400 GrowableArray<char*>& meta_packages) {
401 tty->print("[Meta index for %s=", entry->name());
402 for (int i = 0; i < meta_packages.length(); i++) {
403 if (i > 0) tty->print(" ");
404 tty->print("%s", meta_packages.at(i));
405 }
406 tty->print_cr("]");
407 }
408
409 #if INCLUDE_CDS
410 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
411 assert(DumpSharedSpaces, "only called at dump time");
412 tty->print_cr("Hint: enable -XX:+TraceClassPaths to diagnose the failure");
413 vm_exit_during_initialization(error, message);
414 }
415 #endif
416
417 void ClassLoader::trace_class_path(const char* msg, const char* name) {
418 if (!TraceClassPaths) {
419 return;
420 }
421
422 if (msg) {
423 tty->print("%s", msg);
424 }
425 if (name) {
426 if (strlen(name) < 256) {
427 tty->print("%s", name);
428 } else {
429 // For very long paths, we need to print each character separately,
430 // as print_cr() has a length limit
431 while (name[0] != '\0') {
432 tty->print("%c", name[0]);
433 name++;
434 }
435 }
436 }
437 if (msg && msg[0] == '[') {
438 tty->print_cr("]");
439 } else {
440 tty->cr();
441 }
442 }
443
444 void ClassLoader::setup_bootstrap_meta_index() {
445 // Set up meta index which allows us to open boot jars lazily if
446 // class data sharing is enabled
447 const char* meta_index_path = Arguments::get_meta_index_path();
448 const char* meta_index_dir = Arguments::get_meta_index_dir();
449 setup_meta_index(meta_index_path, meta_index_dir, 0);
450 }
451
452 void ClassLoader::setup_meta_index(const char* meta_index_path, const char* meta_index_dir, int start_index) {
453 const char* known_version = "% VERSION 2";
454 FILE* file = fopen(meta_index_path, "r");
455 int line_no = 0;
456 #if INCLUDE_CDS
457 if (DumpSharedSpaces) {
458 if (file != NULL) {
459 _shared_paths_misc_info->add_required_file(meta_index_path);
460 } else {
461 _shared_paths_misc_info->add_nonexist_path(meta_index_path);
462 }
463 }
464 #endif
465 if (file != NULL) {
466 ResourceMark rm;
467 LazyClassPathEntry* cur_entry = NULL;
468 GrowableArray<char*> boot_class_path_packages(10);
469 char package_name[256];
470 bool skipCurrentJar = false;
471 while (fgets(package_name, sizeof(package_name), file) != NULL) {
472 ++line_no;
473 // Remove trailing newline
474 package_name[strlen(package_name) - 1] = '\0';
475 switch(package_name[0]) {
476 case '%':
477 {
478 if ((line_no == 1) && (strcmp(package_name, known_version) != 0)) {
479 if (TraceClassLoading && Verbose) {
480 tty->print("[Unsupported meta index version]");
481 }
482 fclose(file);
483 return;
484 }
485 }
486
487 // These directives indicate jar files which contain only
488 // classes, only non-classfile resources, or a combination of
489 // the two. See src/share/classes/sun/misc/MetaIndex.java and
490 // make/tools/MetaIndex/BuildMetaIndex.java in the J2SE
491 // workspace.
492 case '#':
493 case '!':
494 case '@':
495 {
496 // Hand off current packages to current lazy entry (if any)
497 if ((cur_entry != NULL) &&
498 (boot_class_path_packages.length() > 0)) {
499 if ((TraceClassLoading || TraceClassPaths) && Verbose) {
500 print_meta_index(cur_entry, boot_class_path_packages);
501 }
502 MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
503 boot_class_path_packages.length());
504 cur_entry->set_meta_index(index);
505 }
506 cur_entry = NULL;
507 boot_class_path_packages.clear();
508
509 // Find lazy entry corresponding to this jar file
510 int count = 0;
511 for (ClassPathEntry* entry = _first_entry; entry != NULL; entry = entry->next(), count++) {
512 if (count >= start_index &&
513 entry->is_lazy() &&
514 string_starts_with(entry->name(), meta_index_dir) &&
515 string_ends_with(entry->name(), &package_name[2])) {
516 cur_entry = (LazyClassPathEntry*) entry;
517 break;
518 }
519 }
520
521 // If the first character is '@', it indicates the following jar
522 // file is a resource only jar file in which case, we should skip
523 // reading the subsequent entries since the resource loading is
524 // totally handled by J2SE side.
525 if (package_name[0] == '@') {
526 if (cur_entry != NULL) {
527 cur_entry->set_meta_index(new MetaIndex(NULL, 0));
528 }
529 cur_entry = NULL;
530 skipCurrentJar = true;
531 } else {
532 skipCurrentJar = false;
533 }
534
535 break;
536 }
537
538 default:
539 {
540 if (!skipCurrentJar && cur_entry != NULL) {
541 char* new_name = strdup(package_name);
542 boot_class_path_packages.append(new_name);
543 }
544 }
545 }
546 }
547 // Hand off current packages to current lazy entry (if any)
548 if ((cur_entry != NULL) &&
549 (boot_class_path_packages.length() > 0)) {
550 if ((TraceClassLoading || TraceClassPaths) && Verbose) {
551 print_meta_index(cur_entry, boot_class_path_packages);
552 }
553 MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
554 boot_class_path_packages.length());
555 cur_entry->set_meta_index(index);
556 }
557 fclose(file);
558 }
559 }
560
561 #if INCLUDE_CDS
562 void ClassLoader::check_shared_classpath(const char *path) {
563 if (strcmp(path, "") == 0) {
564 exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
565 }
566
567 struct stat st;
568 if (os::stat(path, &st) == 0) {
569 if ((st.st_mode & S_IFREG) != S_IFREG) { // is directory
570 if (!os::dir_is_empty(path)) {
571 tty->print_cr("Error: non-empty directory '%s'", path);
572 exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL);
573 }
574 }
575 }
576 }
577 #endif
578
579 void ClassLoader::setup_bootstrap_search_path() {
580 assert(_first_entry == NULL, "should not setup bootstrap class search path twice");
581 const char* sys_class_path = Arguments::get_sysclasspath();
582 if (PrintSharedArchiveAndExit) {
583 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
584 // the same as the bootcp of the shared archive.
585 } else {
586 trace_class_path("[Bootstrap loader class path=", sys_class_path);
587 }
588 #if INCLUDE_CDS
589 if (DumpSharedSpaces) {
590 _shared_paths_misc_info->add_boot_classpath(sys_class_path);
591 }
592 #endif
593 setup_search_path(sys_class_path);
594 }
595
596 #if INCLUDE_CDS
597 int ClassLoader::get_shared_paths_misc_info_size() {
598 return _shared_paths_misc_info->get_used_bytes();
599 }
600
601 void* ClassLoader::get_shared_paths_misc_info() {
602 return _shared_paths_misc_info->buffer();
603 }
604
605 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
606 SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
607 bool result = checker->check();
608 delete checker;
609 return result;
610 }
611 #endif
612
613 void ClassLoader::setup_search_path(const char *class_path) {
614 int offset = 0;
615 int len = (int)strlen(class_path);
616 int end = 0;
617
618 // Iterate over class path entries
619 for (int start = 0; start < len; start = end) {
620 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
621 end++;
622 }
623 EXCEPTION_MARK;
624 ResourceMark rm(THREAD);
625 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
626 strncpy(path, &class_path[start], end - start);
627 path[end - start] = '\0';
628 update_class_path_entry_list(path, false);
629 #if INCLUDE_CDS
630 if (DumpSharedSpaces) {
631 check_shared_classpath(path);
632 }
633 #endif
634 while (class_path[end] == os::path_separator()[0]) {
635 end++;
636 }
637 }
638 }
639
640 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
641 bool lazy, bool throw_exception, TRAPS) {
642 JavaThread* thread = JavaThread::current();
643 if (lazy) {
644 return new LazyClassPathEntry(path, st, throw_exception);
645 }
646 ClassPathEntry* new_entry = NULL;
647 if ((st->st_mode & S_IFREG) == S_IFREG) {
648 // Regular file, should be a zip file
649 // Canonicalized filename
650 char canonical_path[JVM_MAXPATHLEN];
651 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
652 // This matches the classic VM
653 if (throw_exception) {
654 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
655 } else {
656 return NULL;
657 }
658 }
659 char* error_msg = NULL;
660 jzfile* zip;
661 {
662 // enable call to C land
663 ThreadToNativeFromVM ttn(thread);
664 HandleMark hm(thread);
665 zip = (*ZipOpen)(canonical_path, &error_msg);
666 }
667 if (zip != NULL && error_msg == NULL) {
668 new_entry = new ClassPathZipEntry(zip, path);
669 if (TraceClassLoading || TraceClassPaths) {
670 tty->print_cr("[Opened %s]", path);
671 }
672 } else {
673 ResourceMark rm(thread);
674 char *msg;
675 if (error_msg == NULL) {
676 msg = NEW_RESOURCE_ARRAY(char, strlen(path) + 128); ;
677 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
678 } else {
679 int len = (int)(strlen(path) + strlen(error_msg) + 128);
680 msg = NEW_RESOURCE_ARRAY(char, len); ;
681 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
682 }
683 if (throw_exception) {
684 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
685 } else {
686 return NULL;
687 }
688 }
689 } else {
690 // Directory
691 new_entry = new ClassPathDirEntry(path);
692 if (TraceClassLoading || TraceClassPaths) {
693 tty->print_cr("[Path %s]", path);
694 }
695 }
696 return new_entry;
697 }
698
699
700 // Create a class path zip entry for a given path (return NULL if not found
701 // or zip/JAR file cannot be opened)
702 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) {
703 // check for a regular file
704 struct stat st;
705 if (os::stat(path, &st) == 0) {
706 if ((st.st_mode & S_IFREG) == S_IFREG) {
707 char canonical_path[JVM_MAXPATHLEN];
708 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
709 char* error_msg = NULL;
710 jzfile* zip;
711 {
712 // enable call to C land
713 JavaThread* thread = JavaThread::current();
714 ThreadToNativeFromVM ttn(thread);
715 HandleMark hm(thread);
716 zip = (*ZipOpen)(canonical_path, &error_msg);
717 }
718 if (zip != NULL && error_msg == NULL) {
719 // create using canonical path
720 return new ClassPathZipEntry(zip, canonical_path);
721 }
722 }
723 }
724 }
725 return NULL;
726 }
727
728 // returns true if entry already on class path
729 bool ClassLoader::contains_entry(ClassPathEntry *entry) {
730 ClassPathEntry* e = _first_entry;
731 while (e != NULL) {
732 // assume zip entries have been canonicalized
733 if (strcmp(entry->name(), e->name()) == 0) {
734 return true;
735 }
736 e = e->next();
737 }
738 return false;
739 }
740
741 void ClassLoader::add_to_list(ClassPathEntry *new_entry) {
742 if (new_entry != NULL) {
743 if (_last_entry == NULL) {
744 _first_entry = _last_entry = new_entry;
745 } else {
746 _last_entry->set_next(new_entry);
747 _last_entry = new_entry;
748 }
749 }
750 _num_entries ++;
751 }
752
753 // Returns true IFF the file/dir exists and the entry was successfully created.
754 bool ClassLoader::update_class_path_entry_list(const char *path,
755 bool check_for_duplicates,
756 bool throw_exception) {
757 struct stat st;
758 if (os::stat(path, &st) == 0) {
759 // File or directory found
760 ClassPathEntry* new_entry = NULL;
761 Thread* THREAD = Thread::current();
762 new_entry = create_class_path_entry(path, &st, LazyBootClassLoader, throw_exception, CHECK_(false));
763 if (new_entry == NULL) {
764 return false;
765 }
766 // The kernel VM adds dynamically to the end of the classloader path and
767 // doesn't reorder the bootclasspath which would break java.lang.Package
768 // (see PackageInfo).
769 // Add new entry to linked list
770 if (!check_for_duplicates || !contains_entry(new_entry)) {
771 ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry);
772 }
773 return true;
774 } else {
775 #if INCLUDE_CDS
776 if (DumpSharedSpaces) {
777 _shared_paths_misc_info->add_nonexist_path(path);
778 }
779 #endif
780 return false;
781 }
782 }
783
784 void ClassLoader::print_bootclasspath() {
785 ClassPathEntry* e = _first_entry;
786 tty->print("[bootclasspath= ");
787 while (e != NULL) {
788 tty->print("%s ;", e->name());
789 e = e->next();
790 }
791 tty->print_cr("]");
792 }
793
794 void ClassLoader::load_zip_library() {
795 assert(ZipOpen == NULL, "should not load zip library twice");
796 // First make sure native library is loaded
797 os::native_java_library();
798 // Load zip library
799 char path[JVM_MAXPATHLEN];
800 char ebuf[1024];
801 void* handle = NULL;
802 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
803 handle = os::dll_load(path, ebuf, sizeof ebuf);
804 }
805 if (handle == NULL) {
806 vm_exit_during_initialization("Unable to load ZIP library", path);
807 }
808 // Lookup zip entry points
809 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
810 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
811 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
812 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
813 ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, os::dll_lookup(handle, "ZIP_ReadMappedEntry"));
814 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
815 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
816
817 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
818 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
819 GetNextEntry == NULL || Crc32 == NULL) {
820 vm_exit_during_initialization("Corrupted ZIP library", path);
821 }
822
823 // Lookup canonicalize entry in libjava.dll
824 void *javalib_handle = os::native_java_library();
825 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
826 // This lookup only works on 1.3. Do not check for non-null here
827 }
828
829 int ClassLoader::crc32(int crc, const char* buf, int len) {
830 assert(Crc32 != NULL, "ZIP_CRC32 is not found");
831 return (*Crc32)(crc, (const jbyte*)buf, len);
832 }
833
834 // PackageInfo data exists in order to support the java.lang.Package
835 // class. A Package object provides information about a java package
836 // (version, vendor, etc.) which originates in the manifest of the jar
837 // file supplying the package. For application classes, the ClassLoader
838 // object takes care of this.
839
840 // For system (boot) classes, the Java code in the Package class needs
841 // to be able to identify which source jar file contained the boot
842 // class, so that it can extract the manifest from it. This table
843 // identifies java packages with jar files in the boot classpath.
844
845 // Because the boot classpath cannot change, the classpath index is
846 // sufficient to identify the source jar file or directory. (Since
847 // directories have no manifests, the directory name is not required,
848 // but is available.)
849
850 // When using sharing -- the pathnames of entries in the boot classpath
851 // may not be the same at runtime as they were when the archive was
852 // created (NFS, Samba, etc.). The actual files and directories named
853 // in the classpath must be the same files, in the same order, even
854 // though the exact name is not the same.
855
856 class PackageInfo: public BasicHashtableEntry<mtClass> {
857 public:
858 const char* _pkgname; // Package name
859 int _classpath_index; // Index of directory or JAR file loaded from
860
861 PackageInfo* next() {
862 return (PackageInfo*)BasicHashtableEntry<mtClass>::next();
863 }
864
865 const char* pkgname() { return _pkgname; }
866 void set_pkgname(char* pkgname) { _pkgname = pkgname; }
867
868 const char* filename() {
869 return ClassLoader::classpath_entry(_classpath_index)->name();
870 }
871
872 void set_index(int index) {
873 _classpath_index = index;
874 }
875 };
876
877
878 class PackageHashtable : public BasicHashtable<mtClass> {
879 private:
880 inline unsigned int compute_hash(const char *s, int n) {
881 unsigned int val = 0;
882 while (--n >= 0) {
883 val = *s++ + 31 * val;
884 }
885 return val;
886 }
887
888 PackageInfo* bucket(int index) {
889 return (PackageInfo*)BasicHashtable<mtClass>::bucket(index);
890 }
891
892 PackageInfo* get_entry(int index, unsigned int hash,
893 const char* pkgname, size_t n) {
894 for (PackageInfo* pp = bucket(index); pp != NULL; pp = pp->next()) {
895 if (pp->hash() == hash &&
896 strncmp(pkgname, pp->pkgname(), n) == 0 &&
897 pp->pkgname()[n] == '\0') {
898 return pp;
899 }
900 }
901 return NULL;
902 }
903
904 public:
905 PackageHashtable(int table_size)
906 : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo)) {}
907
908 PackageHashtable(int table_size, HashtableBucket<mtClass>* t, int number_of_entries)
909 : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo), t, number_of_entries) {}
910
911 PackageInfo* get_entry(const char* pkgname, int n) {
912 unsigned int hash = compute_hash(pkgname, n);
913 return get_entry(hash_to_index(hash), hash, pkgname, n);
914 }
915
916 PackageInfo* new_entry(char* pkgname, int n) {
917 unsigned int hash = compute_hash(pkgname, n);
918 PackageInfo* pp;
919 pp = (PackageInfo*)BasicHashtable<mtClass>::new_entry(hash);
920 pp->set_pkgname(pkgname);
921 return pp;
922 }
923
924 void add_entry(PackageInfo* pp) {
925 int index = hash_to_index(pp->hash());
926 BasicHashtable<mtClass>::add_entry(index, pp);
927 }
928
929 void copy_pkgnames(const char** packages) {
930 int n = 0;
931 for (int i = 0; i < table_size(); ++i) {
932 for (PackageInfo* pp = bucket(i); pp != NULL; pp = pp->next()) {
933 packages[n++] = pp->pkgname();
934 }
935 }
936 assert(n == number_of_entries(), "just checking");
937 }
938
939 CDS_ONLY(void copy_table(char** top, char* end, PackageHashtable* table);)
940 };
941
942 #if INCLUDE_CDS
943 void PackageHashtable::copy_table(char** top, char* end,
944 PackageHashtable* table) {
945 // Copy (relocate) the table to the shared space.
946 BasicHashtable<mtClass>::copy_table(top, end);
947
948 // Calculate the space needed for the package name strings.
949 int i;
950 intptr_t* tableSize = (intptr_t*)(*top);
951 *top += sizeof(intptr_t); // For table size
952 char* tableStart = *top;
953
954 for (i = 0; i < table_size(); ++i) {
955 for (PackageInfo* pp = table->bucket(i);
956 pp != NULL;
957 pp = pp->next()) {
958 int n1 = (int)(strlen(pp->pkgname()) + 1);
959 if (*top + n1 >= end) {
960 report_out_of_shared_space(SharedMiscData);
961 }
962 pp->set_pkgname((char*)memcpy(*top, pp->pkgname(), n1));
963 *top += n1;
964 }
965 }
966 *top = (char*)align_size_up((intptr_t)*top, sizeof(HeapWord));
967 if (*top >= end) {
968 report_out_of_shared_space(SharedMiscData);
969 }
970
971 // Write table size
972 intptr_t len = *top - (char*)tableStart;
973 *tableSize = len;
974 }
975
976
977 void ClassLoader::copy_package_info_buckets(char** top, char* end) {
978 _package_hash_table->copy_buckets(top, end);
979 }
980
981 void ClassLoader::copy_package_info_table(char** top, char* end) {
982 _package_hash_table->copy_table(top, end, _package_hash_table);
983 }
984 #endif
985
986 PackageInfo* ClassLoader::lookup_package(const char *pkgname) {
987 const char *cp = strrchr(pkgname, '/');
988 if (cp != NULL) {
989 // Package prefix found
990 int n = cp - pkgname + 1;
991 return _package_hash_table->get_entry(pkgname, n);
992 }
993 return NULL;
994 }
995
996
997 bool ClassLoader::add_package(const char *pkgname, int classpath_index, TRAPS) {
998 assert(pkgname != NULL, "just checking");
999 // Bootstrap loader no longer holds system loader lock obj serializing
1000 // load_instance_class and thereby add_package
1001 {
1002 MutexLocker ml(PackageTable_lock, THREAD);
1003 // First check for previously loaded entry
1004 PackageInfo* pp = lookup_package(pkgname);
1005 if (pp != NULL) {
1006 // Existing entry found, check source of package
1007 pp->set_index(classpath_index);
1008 return true;
1009 }
1010
1011 const char *cp = strrchr(pkgname, '/');
1012 if (cp != NULL) {
1013 // Package prefix found
1014 int n = cp - pkgname + 1;
1015
1016 char* new_pkgname = NEW_C_HEAP_ARRAY(char, n + 1, mtClass);
1017 if (new_pkgname == NULL) {
1018 return false;
1019 }
1020
1021 memcpy(new_pkgname, pkgname, n);
1022 new_pkgname[n] = '\0';
1023 pp = _package_hash_table->new_entry(new_pkgname, n);
1024 pp->set_index(classpath_index);
1025
1026 // Insert into hash table
1027 _package_hash_table->add_entry(pp);
1028 }
1029 return true;
1030 }
1031 }
1032
1033
1034 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1035 PackageInfo* pp;
1036 {
1037 MutexLocker ml(PackageTable_lock, THREAD);
1038 pp = lookup_package(name);
1039 }
1040 if (pp == NULL) {
1041 return NULL;
1042 } else {
1043 Handle p = java_lang_String::create_from_str(pp->filename(), THREAD);
1044 return p();
1045 }
1046 }
1047
1048
1049 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1050 ResourceMark rm(THREAD);
1051 int nof_entries;
1052 const char** packages;
1053 {
1054 MutexLocker ml(PackageTable_lock, THREAD);
1055 // Allocate resource char* array containing package names
1056 nof_entries = _package_hash_table->number_of_entries();
1057 if ((packages = NEW_RESOURCE_ARRAY(const char*, nof_entries)) == NULL) {
1058 return NULL;
1059 }
1060 _package_hash_table->copy_pkgnames(packages);
1061 }
1062 // Allocate objArray and fill with java.lang.String
1063 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1064 nof_entries, CHECK_0);
1065 objArrayHandle result(THREAD, r);
1066 for (int i = 0; i < nof_entries; i++) {
1067 Handle str = java_lang_String::create_from_str(packages[i], CHECK_0);
1068 result->obj_at_put(i, str());
1069 }
1070
1071 return result();
1072 }
1073
1074
1075 instanceKlassHandle ClassLoader::load_classfile(Symbol* h_name, TRAPS) {
1076 ResourceMark rm(THREAD);
1077 const char* class_name = h_name->as_C_string();
1078 EventMark m("loading class %s", class_name);
1079 ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion);
1080
1081 stringStream st;
1082 // st.print() uses too much stack space while handling a StackOverflowError
1083 // st.print("%s.class", h_name->as_utf8());
1084 st.print_raw(h_name->as_utf8());
1085 st.print_raw(".class");
1086 const char* file_name = st.as_string();
1087 ClassLoaderExt::Context context(class_name, file_name, THREAD);
1088
1089 // Lookup stream for parsing .class file
1090 ClassFileStream* stream = NULL;
1091 int classpath_index = 0;
1092 ClassPathEntry* e = NULL;
1093 instanceKlassHandle h;
1094 {
1095 PerfClassTraceTime vmtimer(perf_sys_class_lookup_time(),
1096 ((JavaThread*) THREAD)->get_thread_stat()->perf_timers_addr(),
1097 PerfClassTraceTime::CLASS_LOAD);
1098 e = _first_entry;
1099 while (e != NULL) {
1100 stream = e->open_stream(file_name, CHECK_NULL);
1101 if (!context.check(stream, classpath_index)) {
1102 return h; // NULL
1103 }
1104 if (stream != NULL) {
1105 break;
1106 }
1107 e = e->next();
1108 ++classpath_index;
1109 }
1110 }
1111
1112 if (stream != NULL) {
1113 // class file found, parse it
1114 ClassFileParser parser(stream);
1115 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1116 Handle protection_domain;
1117 TempNewSymbol parsed_name = NULL;
1118 instanceKlassHandle result = parser.parseClassFile(h_name,
1119 loader_data,
1120 protection_domain,
1121 parsed_name,
1122 context.should_verify(classpath_index),
1123 THREAD);
1124 if (HAS_PENDING_EXCEPTION) {
1125 ResourceMark rm;
1126 if (DumpSharedSpaces) {
1127 tty->print_cr("Preload Error: Failed to load %s", class_name);
1128 }
1129 return h;
1130 }
1131 h = context.record_result(classpath_index, e, result, THREAD);
1132 } else {
1133 if (DumpSharedSpaces) {
1134 tty->print_cr("Preload Error: Cannot find %s", class_name);
1135 }
1136 }
1137
1138 return h;
1139 }
1140
1141
1142 void ClassLoader::create_package_info_table(HashtableBucket<mtClass> *t, int length,
1143 int number_of_entries) {
1144 assert(_package_hash_table == NULL, "One package info table allowed.");
1145 assert(length == package_hash_table_size * sizeof(HashtableBucket<mtClass>),
1146 "bad shared package info size.");
1147 _package_hash_table = new PackageHashtable(package_hash_table_size, t,
1148 number_of_entries);
1149 }
1150
1151
1152 void ClassLoader::create_package_info_table() {
1153 assert(_package_hash_table == NULL, "shouldn't have one yet");
1154 _package_hash_table = new PackageHashtable(package_hash_table_size);
1155 }
1156
1157
1158 // Initialize the class loader's access to methods in libzip. Parse and
1159 // process the boot classpath into a list ClassPathEntry objects. Once
1160 // this list has been created, it must not change order (see class PackageInfo)
1161 // it can be appended to and is by jvmti and the kernel vm.
1162
1163 void ClassLoader::initialize() {
1164 assert(_package_hash_table == NULL, "should have been initialized by now.");
1165 EXCEPTION_MARK;
1166
1167 if (UsePerfData) {
1168 // jvmstat performance counters
1169 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1170 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1171 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1172 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1173 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1174 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1175 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1176 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1177 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1178 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1179
1180 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1181 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1182 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1183 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1184 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1185 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1186 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1187 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1188 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1189 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1190 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1191 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1192 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1193
1194
1195 // The following performance counters are added for measuring the impact
1196 // of the bug fix of 6365597. They are mainly focused on finding out
1197 // the behavior of system & user-defined classloader lock, whether
1198 // ClassLoader.loadClass/findClass is being called synchronized or not.
1199 // Also two additional counters are created to see whether 'UnsyncloadClass'
1200 // flag is being set or not and how many times load_instance_class call
1201 // fails with linkageError etc.
1202 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1203 "systemLoaderLockContentionRate");
1204 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1205 "nonSystemLoaderLockContentionRate");
1206 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1207 "jvmFindLoadedClassNoLockCalls");
1208 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1209 "jvmDefineClassNoLockCalls");
1210
1211 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1212 "jniDefineClassNoLockCalls");
1213
1214 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1215 "unsafeDefineClassCalls");
1216
1217 NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet");
1218 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1219 "loadInstanceClassFailRate");
1220
1221 // increment the isUnsyncloadClass counter if UnsyncloadClass is set.
1222 if (UnsyncloadClass) {
1223 _isUnsyncloadClass->inc();
1224 }
1225 }
1226
1227 // lookup zip library entry points
1228 load_zip_library();
1229 #if INCLUDE_CDS
1230 // initialize search path
1231 if (DumpSharedSpaces) {
1232 _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
1233 }
1234 #endif
1235 setup_bootstrap_search_path();
1236 if (LazyBootClassLoader) {
1237 // set up meta index which makes boot classpath initialization lazier
1238 setup_bootstrap_meta_index();
1239 }
1240 }
1241
1242 #if INCLUDE_CDS
1243 void ClassLoader::initialize_shared_path() {
1244 if (DumpSharedSpaces) {
1245 ClassLoaderExt::setup_search_paths();
1246 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1247 }
1248 }
1249 #endif
1250
1251 jlong ClassLoader::classloader_time_ms() {
1252 return UsePerfData ?
1253 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1254 }
1255
1256 jlong ClassLoader::class_init_count() {
1257 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1258 }
1259
1260 jlong ClassLoader::class_init_time_ms() {
1261 return UsePerfData ?
1262 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1263 }
1264
1265 jlong ClassLoader::class_verify_time_ms() {
1266 return UsePerfData ?
1267 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1268 }
1269
1270 jlong ClassLoader::class_link_count() {
1271 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1272 }
1273
1274 jlong ClassLoader::class_link_time_ms() {
1275 return UsePerfData ?
1276 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1277 }
1278
1279 int ClassLoader::compute_Object_vtable() {
1280 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1281 // code to determine actual value from file
1282 // Would be value '11' if finals were in vtable
1283 int JDK_1_2_Object_vtable_size = 5;
1284 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1285 }
1286
1287
1288 void classLoader_init() {
1289 ClassLoader::initialize();
1290 }
1291
1292
1293 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1294 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1295 if (CanonicalizeEntry != NULL) {
1296 JavaThread* THREAD = JavaThread::current();
1297 JNIEnv* env = THREAD->jni_environment();
1298 ResourceMark rm(THREAD);
1299
1300 // os::native_path writes into orig_copy
1301 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1302 strcpy(orig_copy, orig);
1303 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1304 return false;
1305 }
1306 } else {
1307 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1308 strncpy(out, orig, len);
1309 out[len - 1] = '\0';
1310 }
1311 return true;
1312 }
1313
1314 #ifndef PRODUCT
1315
1316 void ClassLoader::verify() {
1317 _package_hash_table->verify();
1318 }
1319
1320
1321 // CompileTheWorld
1322 //
1323 // Iterates over all class path entries and forces compilation of all methods
1324 // in all classes found. Currently, only zip/jar archives are searched.
1325 //
1326 // The classes are loaded by the Java level bootstrap class loader, and the
1327 // initializer is called. If DelayCompilationDuringStartup is true (default),
1328 // the interpreter will run the initialization code. Note that forcing
1329 // initialization in this way could potentially lead to initialization order
1330 // problems, in which case we could just force the initialization bit to be set.
1331
1332
1333 // We need to iterate over the contents of a zip/jar file, so we replicate the
1334 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1335 // since jzfile already has a void* definition.
1336 //
1337 // Note that this is only used in debug mode.
1338 //
1339 // HotSpot integration note:
1340 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1341
1342
1343 // JDK 1.3 version
1344 typedef struct real_jzentry13 { /* Zip file entry */
1345 char *name; /* entry name */
1346 jint time; /* modification time */
1347 jint size; /* size of uncompressed data */
1348 jint csize; /* size of compressed data (zero if uncompressed) */
1349 jint crc; /* crc of uncompressed data */
1350 char *comment; /* optional zip file comment */
1351 jbyte *extra; /* optional extra data */
1352 jint pos; /* position of LOC header (if negative) or data */
1353 } real_jzentry13;
1354
1355 typedef struct real_jzfile13 { /* Zip file */
1356 char *name; /* zip file name */
1357 jint refs; /* number of active references */
1358 jint fd; /* open file descriptor */
1359 void *lock; /* read lock */
1360 char *comment; /* zip file comment */
1361 char *msg; /* zip error message */
1362 void *entries; /* array of hash cells */
1363 jint total; /* total number of entries */
1364 unsigned short *table; /* Hash chain heads: indexes into entries */
1365 jint tablelen; /* number of hash eads */
1366 real_jzfile13 *next; /* next zip file in search list */
1367 jzentry *cache; /* we cache the most recently freed jzentry */
1368 /* Information on metadata names in META-INF directory */
1369 char **metanames; /* array of meta names (may have null names) */
1370 jint metacount; /* number of slots in metanames array */
1371 /* If there are any per-entry comments, they are in the comments array */
1372 char **comments;
1373 } real_jzfile13;
1374
1375 // JDK 1.2 version
1376 typedef struct real_jzentry12 { /* Zip file entry */
1377 char *name; /* entry name */
1378 jint time; /* modification time */
1379 jint size; /* size of uncompressed data */
1380 jint csize; /* size of compressed data (zero if uncompressed) */
1381 jint crc; /* crc of uncompressed data */
1382 char *comment; /* optional zip file comment */
1383 jbyte *extra; /* optional extra data */
1384 jint pos; /* position of LOC header (if negative) or data */
1385 struct real_jzentry12 *next; /* next entry in hash table */
1386 } real_jzentry12;
1387
1388 typedef struct real_jzfile12 { /* Zip file */
1389 char *name; /* zip file name */
1390 jint refs; /* number of active references */
1391 jint fd; /* open file descriptor */
1392 void *lock; /* read lock */
1393 char *comment; /* zip file comment */
1394 char *msg; /* zip error message */
1395 real_jzentry12 *entries; /* array of zip entries */
1396 jint total; /* total number of entries */
1397 real_jzentry12 **table; /* hash table of entries */
1398 jint tablelen; /* number of buckets */
1399 jzfile *next; /* next zip file in search list */
1400 } real_jzfile12;
1401
1402
1403 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1404 // For now we only compile all methods in all classes in zip/jar files
1405 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1406 tty->cr();
1407 }
1408
1409
1410 bool ClassPathDirEntry::is_rt_jar() {
1411 return false;
1412 }
1413
1414 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1415 if (JDK_Version::is_jdk12x_version()) {
1416 compile_the_world12(loader, THREAD);
1417 } else {
1418 compile_the_world13(loader, THREAD);
1419 }
1420 if (HAS_PENDING_EXCEPTION) {
1421 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1422 CLEAR_PENDING_EXCEPTION;
1423 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1424 tty->print_cr("Increase class metadata storage if a limit was set");
1425 } else {
1426 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1427 }
1428 }
1429 }
1430
1431 // Version that works for JDK 1.3.x
1432 void ClassPathZipEntry::compile_the_world13(Handle loader, TRAPS) {
1433 real_jzfile13* zip = (real_jzfile13*) _zip;
1434 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1435 tty->cr();
1436 // Iterate over all entries in zip file
1437 for (int n = 0; ; n++) {
1438 real_jzentry13 * ze = (real_jzentry13 *)((*GetNextEntry)(_zip, n));
1439 if (ze == NULL) break;
1440 ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1441 }
1442 }
1443
1444
1445 // Version that works for JDK 1.2.x
1446 void ClassPathZipEntry::compile_the_world12(Handle loader, TRAPS) {
1447 real_jzfile12* zip = (real_jzfile12*) _zip;
1448 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1449 tty->cr();
1450 // Iterate over all entries in zip file
1451 for (int n = 0; ; n++) {
1452 real_jzentry12 * ze = (real_jzentry12 *)((*GetNextEntry)(_zip, n));
1453 if (ze == NULL) break;
1454 ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1455 }
1456 }
1457
1458 bool ClassPathZipEntry::is_rt_jar() {
1459 if (JDK_Version::is_jdk12x_version()) {
1460 return is_rt_jar12();
1461 } else {
1462 return is_rt_jar13();
1463 }
1464 }
1465
1466 // JDK 1.3 version
1467 bool ClassPathZipEntry::is_rt_jar13() {
1468 real_jzfile13* zip = (real_jzfile13*) _zip;
1469 int len = (int)strlen(zip->name);
1470 // Check whether zip name ends in "rt.jar"
1471 // This will match other archives named rt.jar as well, but this is
1472 // only used for debugging.
1473 return (len >= 6) && (strcasecmp(zip->name + len - 6, "rt.jar") == 0);
1474 }
1475
1476 // JDK 1.2 version
1477 bool ClassPathZipEntry::is_rt_jar12() {
1478 real_jzfile12* zip = (real_jzfile12*) _zip;
1479 int len = (int)strlen(zip->name);
1480 // Check whether zip name ends in "rt.jar"
1481 // This will match other archives named rt.jar as well, but this is
1482 // only used for debugging.
1483 return (len >= 6) && (strcasecmp(zip->name + len - 6, "rt.jar") == 0);
1484 }
1485
1486 void LazyClassPathEntry::compile_the_world(Handle loader, TRAPS) {
1487 ClassPathEntry* cpe = resolve_entry(THREAD);
1488 if (cpe != NULL) {
1489 cpe->compile_the_world(loader, CHECK);
1490 }
1491 }
1492
1493 bool LazyClassPathEntry::is_rt_jar() {
1494 Thread* THREAD = Thread::current();
1495 ClassPathEntry* cpe = resolve_entry(THREAD);
1496 return (cpe != NULL) ? cpe->is_jar_file() : false;
1497 }
1498
1499 void ClassLoader::compile_the_world() {
1500 EXCEPTION_MARK;
1501 HandleMark hm(THREAD);
1502 ResourceMark rm(THREAD);
1503 // Make sure we don't run with background compilation
1504 BackgroundCompilation = false;
1505 // Find bootstrap loader
1506 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1507 // Iterate over all bootstrap class path entries
1508 ClassPathEntry* e = _first_entry;
1509 jlong start = os::javaTimeMillis();
1510 while (e != NULL) {
1511 // We stop at rt.jar, unless it is the first bootstrap path entry
1512 if (e->is_rt_jar() && e != _first_entry) break;
1513 e->compile_the_world(system_class_loader, CATCH);
1514 e = e->next();
1515 }
1516 jlong end = os::javaTimeMillis();
1517 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1518 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1519 {
1520 // Print statistics as if before normal exit:
1521 extern void print_statistics();
1522 print_statistics();
1523 }
1524 vm_exit(0);
1525 }
1526
1527 int ClassLoader::_compile_the_world_class_counter = 0;
1528 int ClassLoader::_compile_the_world_method_counter = 0;
1529 static int _codecache_sweep_counter = 0;
1530
1531 // Filter out all exceptions except OOMs
1532 static void clear_pending_exception_if_not_oom(TRAPS) {
1533 if (HAS_PENDING_EXCEPTION &&
1534 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1535 CLEAR_PENDING_EXCEPTION;
1536 }
1537 // The CHECK at the caller will propagate the exception out
1538 }
1539
1540 /**
1541 * Returns if the given method should be compiled when doing compile-the-world.
1542 *
1543 * TODO: This should be a private method in a CompileTheWorld class.
1544 */
1545 static bool can_be_compiled(methodHandle m, int comp_level) {
1546 assert(CompileTheWorld, "must be");
1547
1548 // It's not valid to compile a native wrapper for MethodHandle methods
1549 // that take a MemberName appendix since the bytecode signature is not
1550 // correct.
1551 vmIntrinsics::ID iid = m->intrinsic_id();
1552 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1553 return false;
1554 }
1555
1556 return CompilationPolicy::can_be_compiled(m, comp_level);
1557 }
1558
1559 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1560 int len = (int)strlen(name);
1561 if (len > 6 && strcmp(".class", name + len - 6) == 0) {
1562 // We have a .class file
1563 char buffer[2048];
1564 strncpy(buffer, name, len - 6);
1565 buffer[len-6] = 0;
1566 // If the file has a period after removing .class, it's not really a
1567 // valid class file. The class loader will check everything else.
1568 if (strchr(buffer, '.') == NULL) {
1569 _compile_the_world_class_counter++;
1570 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
1571
1572 // Construct name without extension
1573 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
1574 // Use loader to load and initialize class
1575 Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
1576 instanceKlassHandle k (THREAD, ik);
1577 if (k.not_null() && !HAS_PENDING_EXCEPTION) {
1578 k->initialize(THREAD);
1579 }
1580 bool exception_occurred = HAS_PENDING_EXCEPTION;
1581 clear_pending_exception_if_not_oom(CHECK);
1582 if (CompileTheWorldPreloadClasses && k.not_null()) {
1583 ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD);
1584 if (HAS_PENDING_EXCEPTION) {
1585 // If something went wrong in preloading we just ignore it
1586 clear_pending_exception_if_not_oom(CHECK);
1587 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
1588 }
1589 }
1590
1591 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
1592 if (k.is_null() || exception_occurred) {
1593 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
1594 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
1595 } else {
1596 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
1597 // Preload all classes to get around uncommon traps
1598 // Iterate over all methods in class
1599 int comp_level = CompilationPolicy::policy()->initial_compile_level();
1600 for (int n = 0; n < k->methods()->length(); n++) {
1601 methodHandle m (THREAD, k->methods()->at(n));
1602 if (can_be_compiled(m, comp_level)) {
1603 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
1604 // Give sweeper a chance to keep up with CTW
1605 VM_ForceSafepoint op;
1606 VMThread::execute(&op);
1607 _codecache_sweep_counter = 0;
1608 }
1609 // Force compilation
1610 CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
1611 methodHandle(), 0, "CTW", THREAD);
1612 if (HAS_PENDING_EXCEPTION) {
1613 clear_pending_exception_if_not_oom(CHECK);
1614 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1615 } else {
1616 _compile_the_world_method_counter++;
1617 }
1618 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
1619 // Clobber the first compile and force second tier compilation
1620 nmethod* nm = m->code();
1621 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1622 // Throw out the code so that the code cache doesn't fill up
1623 nm->make_not_entrant();
1624 m->clear_code();
1625 }
1626 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
1627 methodHandle(), 0, "CTW", THREAD);
1628 if (HAS_PENDING_EXCEPTION) {
1629 clear_pending_exception_if_not_oom(CHECK);
1630 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1631 } else {
1632 _compile_the_world_method_counter++;
1633 }
1634 }
1635 } else {
1636 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1637 }
1638
1639 nmethod* nm = m->code();
1640 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1641 // Throw out the code so that the code cache doesn't fill up
1642 nm->make_not_entrant();
1643 m->clear_code();
1644 }
1645 }
1646 }
1647 }
1648 }
1649 }
1650 }
1651
1652 #endif //PRODUCT
1653
1654 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1655 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1656 void PerfClassTraceTime::initialize() {
1657 if (!UsePerfData) return;
1658
1659 if (_eventp != NULL) {
1660 // increment the event counter
1661 _eventp->inc();
1662 }
1663
1664 // stop the current active thread-local timer to measure inclusive time
1665 _prev_active_event = -1;
1666 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1667 if (_timers[i].is_active()) {
1668 assert(_prev_active_event == -1, "should have only one active timer");
1669 _prev_active_event = i;
1670 _timers[i].stop();
1671 }
1672 }
1673
1674 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1675 // start the inclusive timer if not recursively called
1676 _t.start();
1677 }
1678
1679 // start thread-local timer of the given event type
1680 if (!_timers[_event_type].is_active()) {
1681 _timers[_event_type].start();
1682 }
1683 }
1684
1685 PerfClassTraceTime::~PerfClassTraceTime() {
1686 if (!UsePerfData) return;
1687
1688 // stop the thread-local timer as the event completes
1689 // and resume the thread-local timer of the event next on the stack
1690 _timers[_event_type].stop();
1691 jlong selftime = _timers[_event_type].ticks();
1692
1693 if (_prev_active_event >= 0) {
1694 _timers[_prev_active_event].start();
1695 }
1696
1697 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1698
1699 // increment the counters only on the leaf call
1700 _t.stop();
1701 _timep->inc(_t.ticks());
1702 if (_selftimep != NULL) {
1703 _selftimep->inc(selftime);
1704 }
1705 // add all class loading related event selftime to the accumulated time counter
1706 ClassLoader::perf_accumulated_time()->inc(selftime);
1707
1708 // reset the timer
1709 _timers[_event_type].reset();
1710 }