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, bool canonicalize) {
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 if (canonicalize) {
629 char* canonical_path = NEW_RESOURCE_ARRAY(char, JVM_MAXPATHLEN + 1);
630 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
631 path = canonical_path;
632 }
633 }
634 update_class_path_entry_list(path, /*check_for_duplicates=*/canonicalize);
635 #if INCLUDE_CDS
636 if (DumpSharedSpaces) {
637 check_shared_classpath(path);
638 }
639 #endif
640 while (class_path[end] == os::path_separator()[0]) {
641 end++;
642 }
643 }
644 }
645
646 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
647 bool lazy, bool throw_exception, TRAPS) {
648 JavaThread* thread = JavaThread::current();
649 if (lazy) {
650 return new LazyClassPathEntry(path, st, throw_exception);
651 }
652 ClassPathEntry* new_entry = NULL;
653 if ((st->st_mode & S_IFREG) == S_IFREG) {
654 // Regular file, should be a zip file
655 // Canonicalized filename
656 char canonical_path[JVM_MAXPATHLEN];
657 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
658 // This matches the classic VM
659 if (throw_exception) {
660 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
661 } else {
662 return NULL;
663 }
664 }
665 char* error_msg = NULL;
666 jzfile* zip;
667 {
668 // enable call to C land
669 ThreadToNativeFromVM ttn(thread);
670 HandleMark hm(thread);
671 zip = (*ZipOpen)(canonical_path, &error_msg);
672 }
673 if (zip != NULL && error_msg == NULL) {
674 new_entry = new ClassPathZipEntry(zip, path);
675 if (TraceClassLoading || TraceClassPaths) {
676 tty->print_cr("[Opened %s]", path);
677 }
678 } else {
679 ResourceMark rm(thread);
680 char *msg;
681 if (error_msg == NULL) {
682 msg = NEW_RESOURCE_ARRAY(char, strlen(path) + 128); ;
683 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
684 } else {
685 int len = (int)(strlen(path) + strlen(error_msg) + 128);
686 msg = NEW_RESOURCE_ARRAY(char, len); ;
687 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
688 }
689 if (throw_exception) {
690 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
691 } else {
692 return NULL;
693 }
694 }
695 } else {
696 // Directory
697 new_entry = new ClassPathDirEntry(path);
698 if (TraceClassLoading || TraceClassPaths) {
699 tty->print_cr("[Path %s]", path);
700 }
701 }
702 return new_entry;
703 }
704
705
706 // Create a class path zip entry for a given path (return NULL if not found
707 // or zip/JAR file cannot be opened)
708 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) {
709 // check for a regular file
710 struct stat st;
711 if (os::stat(path, &st) == 0) {
712 if ((st.st_mode & S_IFREG) == S_IFREG) {
713 char canonical_path[JVM_MAXPATHLEN];
714 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
715 char* error_msg = NULL;
716 jzfile* zip;
717 {
718 // enable call to C land
719 JavaThread* thread = JavaThread::current();
720 ThreadToNativeFromVM ttn(thread);
721 HandleMark hm(thread);
722 zip = (*ZipOpen)(canonical_path, &error_msg);
723 }
724 if (zip != NULL && error_msg == NULL) {
725 // create using canonical path
726 return new ClassPathZipEntry(zip, canonical_path);
727 }
728 }
729 }
730 }
731 return NULL;
732 }
733
734 // returns true if entry already on class path
735 bool ClassLoader::contains_entry(ClassPathEntry *entry) {
736 ClassPathEntry* e = _first_entry;
737 while (e != NULL) {
738 // assume zip entries have been canonicalized
739 if (strcmp(entry->name(), e->name()) == 0) {
740 return true;
741 }
742 e = e->next();
743 }
744 return false;
745 }
746
747 void ClassLoader::add_to_list(ClassPathEntry *new_entry) {
748 if (new_entry != NULL) {
749 if (_last_entry == NULL) {
750 _first_entry = _last_entry = new_entry;
751 } else {
752 _last_entry->set_next(new_entry);
753 _last_entry = new_entry;
754 }
755 }
756 _num_entries ++;
757 }
758
759 // Returns true IFF the file/dir exists and the entry was successfully created.
760 bool ClassLoader::update_class_path_entry_list(const char *path,
761 bool check_for_duplicates,
762 bool throw_exception) {
763 struct stat st;
764 if (os::stat(path, &st) == 0) {
765 // File or directory found
766 ClassPathEntry* new_entry = NULL;
767 Thread* THREAD = Thread::current();
768 new_entry = create_class_path_entry(path, &st, LazyBootClassLoader, throw_exception, CHECK_(false));
769 if (new_entry == NULL) {
770 return false;
771 }
772 // The kernel VM adds dynamically to the end of the classloader path and
773 // doesn't reorder the bootclasspath which would break java.lang.Package
774 // (see PackageInfo).
775 // Add new entry to linked list
776 if (!check_for_duplicates || !contains_entry(new_entry)) {
777 ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry);
778 }
779 return true;
780 } else {
781 #if INCLUDE_CDS
782 if (DumpSharedSpaces) {
783 _shared_paths_misc_info->add_nonexist_path(path);
784 }
785 #endif
786 return false;
787 }
788 }
789
790 void ClassLoader::print_bootclasspath() {
791 ClassPathEntry* e = _first_entry;
792 tty->print("[bootclasspath= ");
793 while (e != NULL) {
794 tty->print("%s ;", e->name());
795 e = e->next();
796 }
797 tty->print_cr("]");
798 }
799
800 void ClassLoader::load_zip_library() {
801 assert(ZipOpen == NULL, "should not load zip library twice");
802 // First make sure native library is loaded
803 os::native_java_library();
804 // Load zip library
805 char path[JVM_MAXPATHLEN];
806 char ebuf[1024];
807 void* handle = NULL;
808 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
809 handle = os::dll_load(path, ebuf, sizeof ebuf);
810 }
811 if (handle == NULL) {
812 vm_exit_during_initialization("Unable to load ZIP library", path);
813 }
814 // Lookup zip entry points
815 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
816 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
817 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
818 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
819 ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, os::dll_lookup(handle, "ZIP_ReadMappedEntry"));
820 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
821 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
822
823 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
824 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
825 GetNextEntry == NULL || Crc32 == NULL) {
826 vm_exit_during_initialization("Corrupted ZIP library", path);
827 }
828
829 // Lookup canonicalize entry in libjava.dll
830 void *javalib_handle = os::native_java_library();
831 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
832 // This lookup only works on 1.3. Do not check for non-null here
833 }
834
835 int ClassLoader::crc32(int crc, const char* buf, int len) {
836 assert(Crc32 != NULL, "ZIP_CRC32 is not found");
837 return (*Crc32)(crc, (const jbyte*)buf, len);
838 }
839
840 // PackageInfo data exists in order to support the java.lang.Package
841 // class. A Package object provides information about a java package
842 // (version, vendor, etc.) which originates in the manifest of the jar
843 // file supplying the package. For application classes, the ClassLoader
844 // object takes care of this.
845
846 // For system (boot) classes, the Java code in the Package class needs
847 // to be able to identify which source jar file contained the boot
848 // class, so that it can extract the manifest from it. This table
849 // identifies java packages with jar files in the boot classpath.
850
851 // Because the boot classpath cannot change, the classpath index is
852 // sufficient to identify the source jar file or directory. (Since
853 // directories have no manifests, the directory name is not required,
854 // but is available.)
855
856 // When using sharing -- the pathnames of entries in the boot classpath
857 // may not be the same at runtime as they were when the archive was
858 // created (NFS, Samba, etc.). The actual files and directories named
859 // in the classpath must be the same files, in the same order, even
860 // though the exact name is not the same.
861
862 class PackageInfo: public BasicHashtableEntry<mtClass> {
863 public:
864 const char* _pkgname; // Package name
865 int _classpath_index; // Index of directory or JAR file loaded from
866
867 PackageInfo* next() {
868 return (PackageInfo*)BasicHashtableEntry<mtClass>::next();
869 }
870
871 const char* pkgname() { return _pkgname; }
872 void set_pkgname(char* pkgname) { _pkgname = pkgname; }
873
874 const char* filename() {
875 return ClassLoader::classpath_entry(_classpath_index)->name();
876 }
877
878 void set_index(int index) {
879 _classpath_index = index;
880 }
881 };
882
883
884 class PackageHashtable : public BasicHashtable<mtClass> {
885 private:
886 inline unsigned int compute_hash(const char *s, int n) {
887 unsigned int val = 0;
888 while (--n >= 0) {
889 val = *s++ + 31 * val;
890 }
891 return val;
892 }
893
894 PackageInfo* bucket(int index) {
895 return (PackageInfo*)BasicHashtable<mtClass>::bucket(index);
896 }
897
898 PackageInfo* get_entry(int index, unsigned int hash,
899 const char* pkgname, size_t n) {
900 for (PackageInfo* pp = bucket(index); pp != NULL; pp = pp->next()) {
901 if (pp->hash() == hash &&
902 strncmp(pkgname, pp->pkgname(), n) == 0 &&
903 pp->pkgname()[n] == '\0') {
904 return pp;
905 }
906 }
907 return NULL;
908 }
909
910 public:
911 PackageHashtable(int table_size)
912 : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo)) {}
913
914 PackageHashtable(int table_size, HashtableBucket<mtClass>* t, int number_of_entries)
915 : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo), t, number_of_entries) {}
916
917 PackageInfo* get_entry(const char* pkgname, int n) {
918 unsigned int hash = compute_hash(pkgname, n);
919 return get_entry(hash_to_index(hash), hash, pkgname, n);
920 }
921
922 PackageInfo* new_entry(char* pkgname, int n) {
923 unsigned int hash = compute_hash(pkgname, n);
924 PackageInfo* pp;
925 pp = (PackageInfo*)BasicHashtable<mtClass>::new_entry(hash);
926 pp->set_pkgname(pkgname);
927 return pp;
928 }
929
930 void add_entry(PackageInfo* pp) {
931 int index = hash_to_index(pp->hash());
932 BasicHashtable<mtClass>::add_entry(index, pp);
933 }
934
935 void copy_pkgnames(const char** packages) {
936 int n = 0;
937 for (int i = 0; i < table_size(); ++i) {
938 for (PackageInfo* pp = bucket(i); pp != NULL; pp = pp->next()) {
939 packages[n++] = pp->pkgname();
940 }
941 }
942 assert(n == number_of_entries(), "just checking");
943 }
944
945 CDS_ONLY(void copy_table(char** top, char* end, PackageHashtable* table);)
946 };
947
948 #if INCLUDE_CDS
949 void PackageHashtable::copy_table(char** top, char* end,
950 PackageHashtable* table) {
951 // Copy (relocate) the table to the shared space.
952 BasicHashtable<mtClass>::copy_table(top, end);
953
954 // Calculate the space needed for the package name strings.
955 int i;
956 intptr_t* tableSize = (intptr_t*)(*top);
957 *top += sizeof(intptr_t); // For table size
958 char* tableStart = *top;
959
960 for (i = 0; i < table_size(); ++i) {
961 for (PackageInfo* pp = table->bucket(i);
962 pp != NULL;
963 pp = pp->next()) {
964 int n1 = (int)(strlen(pp->pkgname()) + 1);
965 if (*top + n1 >= end) {
966 report_out_of_shared_space(SharedMiscData);
967 }
968 pp->set_pkgname((char*)memcpy(*top, pp->pkgname(), n1));
969 *top += n1;
970 }
971 }
972 *top = (char*)align_size_up((intptr_t)*top, sizeof(HeapWord));
973 if (*top >= end) {
974 report_out_of_shared_space(SharedMiscData);
975 }
976
977 // Write table size
978 intptr_t len = *top - (char*)tableStart;
979 *tableSize = len;
980 }
981
982
983 void ClassLoader::copy_package_info_buckets(char** top, char* end) {
984 _package_hash_table->copy_buckets(top, end);
985 }
986
987 void ClassLoader::copy_package_info_table(char** top, char* end) {
988 _package_hash_table->copy_table(top, end, _package_hash_table);
989 }
990 #endif
991
992 PackageInfo* ClassLoader::lookup_package(const char *pkgname) {
993 const char *cp = strrchr(pkgname, '/');
994 if (cp != NULL) {
995 // Package prefix found
996 int n = cp - pkgname + 1;
997 return _package_hash_table->get_entry(pkgname, n);
998 }
999 return NULL;
1000 }
1001
1002
1003 bool ClassLoader::add_package(const char *pkgname, int classpath_index, TRAPS) {
1004 assert(pkgname != NULL, "just checking");
1005 // Bootstrap loader no longer holds system loader lock obj serializing
1006 // load_instance_class and thereby add_package
1007 {
1008 MutexLocker ml(PackageTable_lock, THREAD);
1009 // First check for previously loaded entry
1010 PackageInfo* pp = lookup_package(pkgname);
1011 if (pp != NULL) {
1012 // Existing entry found, check source of package
1013 pp->set_index(classpath_index);
1014 return true;
1015 }
1016
1017 const char *cp = strrchr(pkgname, '/');
1018 if (cp != NULL) {
1019 // Package prefix found
1020 int n = cp - pkgname + 1;
1021
1022 char* new_pkgname = NEW_C_HEAP_ARRAY(char, n + 1, mtClass);
1023 if (new_pkgname == NULL) {
1024 return false;
1025 }
1026
1027 memcpy(new_pkgname, pkgname, n);
1028 new_pkgname[n] = '\0';
1029 pp = _package_hash_table->new_entry(new_pkgname, n);
1030 pp->set_index(classpath_index);
1031
1032 // Insert into hash table
1033 _package_hash_table->add_entry(pp);
1034 }
1035 return true;
1036 }
1037 }
1038
1039
1040 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1041 PackageInfo* pp;
1042 {
1043 MutexLocker ml(PackageTable_lock, THREAD);
1044 pp = lookup_package(name);
1045 }
1046 if (pp == NULL) {
1047 return NULL;
1048 } else {
1049 Handle p = java_lang_String::create_from_str(pp->filename(), THREAD);
1050 return p();
1051 }
1052 }
1053
1054
1055 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1056 ResourceMark rm(THREAD);
1057 int nof_entries;
1058 const char** packages;
1059 {
1060 MutexLocker ml(PackageTable_lock, THREAD);
1061 // Allocate resource char* array containing package names
1062 nof_entries = _package_hash_table->number_of_entries();
1063 if ((packages = NEW_RESOURCE_ARRAY(const char*, nof_entries)) == NULL) {
1064 return NULL;
1065 }
1066 _package_hash_table->copy_pkgnames(packages);
1067 }
1068 // Allocate objArray and fill with java.lang.String
1069 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1070 nof_entries, CHECK_0);
1071 objArrayHandle result(THREAD, r);
1072 for (int i = 0; i < nof_entries; i++) {
1073 Handle str = java_lang_String::create_from_str(packages[i], CHECK_0);
1074 result->obj_at_put(i, str());
1075 }
1076
1077 return result();
1078 }
1079
1080
1081 instanceKlassHandle ClassLoader::load_classfile(Symbol* h_name, TRAPS) {
1082 ResourceMark rm(THREAD);
1083 const char* class_name = h_name->as_C_string();
1084 EventMark m("loading class %s", class_name);
1085 ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion);
1086
1087 stringStream st;
1088 // st.print() uses too much stack space while handling a StackOverflowError
1089 // st.print("%s.class", h_name->as_utf8());
1090 st.print_raw(h_name->as_utf8());
1091 st.print_raw(".class");
1092 const char* file_name = st.as_string();
1093 ClassLoaderExt::Context context(class_name, file_name, THREAD);
1094
1095 // Lookup stream for parsing .class file
1096 ClassFileStream* stream = NULL;
1097 int classpath_index = 0;
1098 ClassPathEntry* e = NULL;
1099 instanceKlassHandle h;
1100 {
1101 PerfClassTraceTime vmtimer(perf_sys_class_lookup_time(),
1102 ((JavaThread*) THREAD)->get_thread_stat()->perf_timers_addr(),
1103 PerfClassTraceTime::CLASS_LOAD);
1104 e = _first_entry;
1105 while (e != NULL) {
1106 stream = e->open_stream(file_name, CHECK_NULL);
1107 if (!context.check(stream, classpath_index)) {
1108 return h; // NULL
1109 }
1110 if (stream != NULL) {
1111 break;
1112 }
1113 e = e->next();
1114 ++classpath_index;
1115 }
1116 }
1117
1118 if (stream != NULL) {
1119 // class file found, parse it
1120 ClassFileParser parser(stream);
1121 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1122 Handle protection_domain;
1123 TempNewSymbol parsed_name = NULL;
1124 instanceKlassHandle result = parser.parseClassFile(h_name,
1125 loader_data,
1126 protection_domain,
1127 parsed_name,
1128 context.should_verify(classpath_index),
1129 THREAD);
1130 if (HAS_PENDING_EXCEPTION) {
1131 ResourceMark rm;
1132 if (DumpSharedSpaces) {
1133 tty->print_cr("Preload Error: Failed to load %s", class_name);
1134 }
1135 return h;
1136 }
1137 h = context.record_result(classpath_index, e, result, THREAD);
1138 } else {
1139 if (DumpSharedSpaces) {
1140 tty->print_cr("Preload Warning: Cannot find %s", class_name);
1141 }
1142 }
1143
1144 return h;
1145 }
1146
1147
1148 void ClassLoader::create_package_info_table(HashtableBucket<mtClass> *t, int length,
1149 int number_of_entries) {
1150 assert(_package_hash_table == NULL, "One package info table allowed.");
1151 assert(length == package_hash_table_size * sizeof(HashtableBucket<mtClass>),
1152 "bad shared package info size.");
1153 _package_hash_table = new PackageHashtable(package_hash_table_size, t,
1154 number_of_entries);
1155 }
1156
1157
1158 void ClassLoader::create_package_info_table() {
1159 assert(_package_hash_table == NULL, "shouldn't have one yet");
1160 _package_hash_table = new PackageHashtable(package_hash_table_size);
1161 }
1162
1163
1164 // Initialize the class loader's access to methods in libzip. Parse and
1165 // process the boot classpath into a list ClassPathEntry objects. Once
1166 // this list has been created, it must not change order (see class PackageInfo)
1167 // it can be appended to and is by jvmti and the kernel vm.
1168
1169 void ClassLoader::initialize() {
1170 assert(_package_hash_table == NULL, "should have been initialized by now.");
1171 EXCEPTION_MARK;
1172
1173 if (UsePerfData) {
1174 // jvmstat performance counters
1175 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1176 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1177 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1178 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1179 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1180 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1181 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1182 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1183 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1184 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1185
1186 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1187 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1188 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1189 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1190 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1191 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1192 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1193 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1194 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1195 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1196 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1197 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1198 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1199
1200
1201 // The following performance counters are added for measuring the impact
1202 // of the bug fix of 6365597. They are mainly focused on finding out
1203 // the behavior of system & user-defined classloader lock, whether
1204 // ClassLoader.loadClass/findClass is being called synchronized or not.
1205 // Also two additional counters are created to see whether 'UnsyncloadClass'
1206 // flag is being set or not and how many times load_instance_class call
1207 // fails with linkageError etc.
1208 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1209 "systemLoaderLockContentionRate");
1210 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1211 "nonSystemLoaderLockContentionRate");
1212 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1213 "jvmFindLoadedClassNoLockCalls");
1214 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1215 "jvmDefineClassNoLockCalls");
1216
1217 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1218 "jniDefineClassNoLockCalls");
1219
1220 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1221 "unsafeDefineClassCalls");
1222
1223 NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet");
1224 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1225 "loadInstanceClassFailRate");
1226
1227 // increment the isUnsyncloadClass counter if UnsyncloadClass is set.
1228 if (UnsyncloadClass) {
1229 _isUnsyncloadClass->inc();
1230 }
1231 }
1232
1233 // lookup zip library entry points
1234 load_zip_library();
1235 #if INCLUDE_CDS
1236 // initialize search path
1237 if (DumpSharedSpaces) {
1238 _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
1239 }
1240 #endif
1241 setup_bootstrap_search_path();
1242 if (LazyBootClassLoader) {
1243 // set up meta index which makes boot classpath initialization lazier
1244 setup_bootstrap_meta_index();
1245 }
1246 }
1247
1248 #if INCLUDE_CDS
1249 void ClassLoader::initialize_shared_path() {
1250 if (DumpSharedSpaces) {
1251 ClassLoaderExt::setup_search_paths();
1252 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1253 }
1254 }
1255 #endif
1256
1257 jlong ClassLoader::classloader_time_ms() {
1258 return UsePerfData ?
1259 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1260 }
1261
1262 jlong ClassLoader::class_init_count() {
1263 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1264 }
1265
1266 jlong ClassLoader::class_init_time_ms() {
1267 return UsePerfData ?
1268 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1269 }
1270
1271 jlong ClassLoader::class_verify_time_ms() {
1272 return UsePerfData ?
1273 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1274 }
1275
1276 jlong ClassLoader::class_link_count() {
1277 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1278 }
1279
1280 jlong ClassLoader::class_link_time_ms() {
1281 return UsePerfData ?
1282 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1283 }
1284
1285 int ClassLoader::compute_Object_vtable() {
1286 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1287 // code to determine actual value from file
1288 // Would be value '11' if finals were in vtable
1289 int JDK_1_2_Object_vtable_size = 5;
1290 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1291 }
1292
1293
1294 void classLoader_init() {
1295 ClassLoader::initialize();
1296 }
1297
1298
1299 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1300 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1301 if (CanonicalizeEntry != NULL) {
1302 JavaThread* THREAD = JavaThread::current();
1303 JNIEnv* env = THREAD->jni_environment();
1304 ResourceMark rm(THREAD);
1305
1306 // os::native_path writes into orig_copy
1307 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1308 strcpy(orig_copy, orig);
1309 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1310 return false;
1311 }
1312 } else {
1313 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1314 strncpy(out, orig, len);
1315 out[len - 1] = '\0';
1316 }
1317 return true;
1318 }
1319
1320 #ifndef PRODUCT
1321
1322 void ClassLoader::verify() {
1323 _package_hash_table->verify();
1324 }
1325
1326
1327 // CompileTheWorld
1328 //
1329 // Iterates over all class path entries and forces compilation of all methods
1330 // in all classes found. Currently, only zip/jar archives are searched.
1331 //
1332 // The classes are loaded by the Java level bootstrap class loader, and the
1333 // initializer is called. If DelayCompilationDuringStartup is true (default),
1334 // the interpreter will run the initialization code. Note that forcing
1335 // initialization in this way could potentially lead to initialization order
1336 // problems, in which case we could just force the initialization bit to be set.
1337
1338
1339 // We need to iterate over the contents of a zip/jar file, so we replicate the
1340 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1341 // since jzfile already has a void* definition.
1342 //
1343 // Note that this is only used in debug mode.
1344 //
1345 // HotSpot integration note:
1346 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1347
1348
1349 // JDK 1.3 version
1350 typedef struct real_jzentry13 { /* Zip file entry */
1351 char *name; /* entry name */
1352 jint time; /* modification time */
1353 jint size; /* size of uncompressed data */
1354 jint csize; /* size of compressed data (zero if uncompressed) */
1355 jint crc; /* crc of uncompressed data */
1356 char *comment; /* optional zip file comment */
1357 jbyte *extra; /* optional extra data */
1358 jint pos; /* position of LOC header (if negative) or data */
1359 } real_jzentry13;
1360
1361 typedef struct real_jzfile13 { /* Zip file */
1362 char *name; /* zip file name */
1363 jint refs; /* number of active references */
1364 jint fd; /* open file descriptor */
1365 void *lock; /* read lock */
1366 char *comment; /* zip file comment */
1367 char *msg; /* zip error message */
1368 void *entries; /* array of hash cells */
1369 jint total; /* total number of entries */
1370 unsigned short *table; /* Hash chain heads: indexes into entries */
1371 jint tablelen; /* number of hash eads */
1372 real_jzfile13 *next; /* next zip file in search list */
1373 jzentry *cache; /* we cache the most recently freed jzentry */
1374 /* Information on metadata names in META-INF directory */
1375 char **metanames; /* array of meta names (may have null names) */
1376 jint metacount; /* number of slots in metanames array */
1377 /* If there are any per-entry comments, they are in the comments array */
1378 char **comments;
1379 } real_jzfile13;
1380
1381 // JDK 1.2 version
1382 typedef struct real_jzentry12 { /* Zip file entry */
1383 char *name; /* entry name */
1384 jint time; /* modification time */
1385 jint size; /* size of uncompressed data */
1386 jint csize; /* size of compressed data (zero if uncompressed) */
1387 jint crc; /* crc of uncompressed data */
1388 char *comment; /* optional zip file comment */
1389 jbyte *extra; /* optional extra data */
1390 jint pos; /* position of LOC header (if negative) or data */
1391 struct real_jzentry12 *next; /* next entry in hash table */
1392 } real_jzentry12;
1393
1394 typedef struct real_jzfile12 { /* Zip file */
1395 char *name; /* zip file name */
1396 jint refs; /* number of active references */
1397 jint fd; /* open file descriptor */
1398 void *lock; /* read lock */
1399 char *comment; /* zip file comment */
1400 char *msg; /* zip error message */
1401 real_jzentry12 *entries; /* array of zip entries */
1402 jint total; /* total number of entries */
1403 real_jzentry12 **table; /* hash table of entries */
1404 jint tablelen; /* number of buckets */
1405 jzfile *next; /* next zip file in search list */
1406 } real_jzfile12;
1407
1408
1409 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1410 // For now we only compile all methods in all classes in zip/jar files
1411 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1412 tty->cr();
1413 }
1414
1415
1416 bool ClassPathDirEntry::is_rt_jar() {
1417 return false;
1418 }
1419
1420 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1421 if (JDK_Version::is_jdk12x_version()) {
1422 compile_the_world12(loader, THREAD);
1423 } else {
1424 compile_the_world13(loader, THREAD);
1425 }
1426 if (HAS_PENDING_EXCEPTION) {
1427 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1428 CLEAR_PENDING_EXCEPTION;
1429 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1430 tty->print_cr("Increase class metadata storage if a limit was set");
1431 } else {
1432 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1433 }
1434 }
1435 }
1436
1437 // Version that works for JDK 1.3.x
1438 void ClassPathZipEntry::compile_the_world13(Handle loader, TRAPS) {
1439 real_jzfile13* zip = (real_jzfile13*) _zip;
1440 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1441 tty->cr();
1442 // Iterate over all entries in zip file
1443 for (int n = 0; ; n++) {
1444 real_jzentry13 * ze = (real_jzentry13 *)((*GetNextEntry)(_zip, n));
1445 if (ze == NULL) break;
1446 ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1447 }
1448 }
1449
1450
1451 // Version that works for JDK 1.2.x
1452 void ClassPathZipEntry::compile_the_world12(Handle loader, TRAPS) {
1453 real_jzfile12* zip = (real_jzfile12*) _zip;
1454 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1455 tty->cr();
1456 // Iterate over all entries in zip file
1457 for (int n = 0; ; n++) {
1458 real_jzentry12 * ze = (real_jzentry12 *)((*GetNextEntry)(_zip, n));
1459 if (ze == NULL) break;
1460 ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1461 }
1462 }
1463
1464 bool ClassPathZipEntry::is_rt_jar() {
1465 if (JDK_Version::is_jdk12x_version()) {
1466 return is_rt_jar12();
1467 } else {
1468 return is_rt_jar13();
1469 }
1470 }
1471
1472 // JDK 1.3 version
1473 bool ClassPathZipEntry::is_rt_jar13() {
1474 real_jzfile13* zip = (real_jzfile13*) _zip;
1475 int len = (int)strlen(zip->name);
1476 // Check whether zip name ends in "rt.jar"
1477 // This will match other archives named rt.jar as well, but this is
1478 // only used for debugging.
1479 return (len >= 6) && (strcasecmp(zip->name + len - 6, "rt.jar") == 0);
1480 }
1481
1482 // JDK 1.2 version
1483 bool ClassPathZipEntry::is_rt_jar12() {
1484 real_jzfile12* zip = (real_jzfile12*) _zip;
1485 int len = (int)strlen(zip->name);
1486 // Check whether zip name ends in "rt.jar"
1487 // This will match other archives named rt.jar as well, but this is
1488 // only used for debugging.
1489 return (len >= 6) && (strcasecmp(zip->name + len - 6, "rt.jar") == 0);
1490 }
1491
1492 void LazyClassPathEntry::compile_the_world(Handle loader, TRAPS) {
1493 ClassPathEntry* cpe = resolve_entry(THREAD);
1494 if (cpe != NULL) {
1495 cpe->compile_the_world(loader, CHECK);
1496 }
1497 }
1498
1499 bool LazyClassPathEntry::is_rt_jar() {
1500 Thread* THREAD = Thread::current();
1501 ClassPathEntry* cpe = resolve_entry(THREAD);
1502 return (cpe != NULL) ? cpe->is_jar_file() : false;
1503 }
1504
1505 void ClassLoader::compile_the_world() {
1506 EXCEPTION_MARK;
1507 HandleMark hm(THREAD);
1508 ResourceMark rm(THREAD);
1509 // Make sure we don't run with background compilation
1510 BackgroundCompilation = false;
1511 // Find bootstrap loader
1512 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1513 // Iterate over all bootstrap class path entries
1514 ClassPathEntry* e = _first_entry;
1515 jlong start = os::javaTimeMillis();
1516 while (e != NULL) {
1517 // We stop at rt.jar, unless it is the first bootstrap path entry
1518 if (e->is_rt_jar() && e != _first_entry) break;
1519 e->compile_the_world(system_class_loader, CATCH);
1520 e = e->next();
1521 }
1522 jlong end = os::javaTimeMillis();
1523 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1524 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1525 {
1526 // Print statistics as if before normal exit:
1527 extern void print_statistics();
1528 print_statistics();
1529 }
1530 vm_exit(0);
1531 }
1532
1533 int ClassLoader::_compile_the_world_class_counter = 0;
1534 int ClassLoader::_compile_the_world_method_counter = 0;
1535 static int _codecache_sweep_counter = 0;
1536
1537 // Filter out all exceptions except OOMs
1538 static void clear_pending_exception_if_not_oom(TRAPS) {
1539 if (HAS_PENDING_EXCEPTION &&
1540 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1541 CLEAR_PENDING_EXCEPTION;
1542 }
1543 // The CHECK at the caller will propagate the exception out
1544 }
1545
1546 /**
1547 * Returns if the given method should be compiled when doing compile-the-world.
1548 *
1549 * TODO: This should be a private method in a CompileTheWorld class.
1550 */
1551 static bool can_be_compiled(methodHandle m, int comp_level) {
1552 assert(CompileTheWorld, "must be");
1553
1554 // It's not valid to compile a native wrapper for MethodHandle methods
1555 // that take a MemberName appendix since the bytecode signature is not
1556 // correct.
1557 vmIntrinsics::ID iid = m->intrinsic_id();
1558 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1559 return false;
1560 }
1561
1562 return CompilationPolicy::can_be_compiled(m, comp_level);
1563 }
1564
1565 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1566 int len = (int)strlen(name);
1567 if (len > 6 && strcmp(".class", name + len - 6) == 0) {
1568 // We have a .class file
1569 char buffer[2048];
1570 strncpy(buffer, name, len - 6);
1571 buffer[len-6] = 0;
1572 // If the file has a period after removing .class, it's not really a
1573 // valid class file. The class loader will check everything else.
1574 if (strchr(buffer, '.') == NULL) {
1575 _compile_the_world_class_counter++;
1576 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
1577
1578 // Construct name without extension
1579 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
1580 // Use loader to load and initialize class
1581 Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
1582 instanceKlassHandle k (THREAD, ik);
1583 if (k.not_null() && !HAS_PENDING_EXCEPTION) {
1584 k->initialize(THREAD);
1585 }
1586 bool exception_occurred = HAS_PENDING_EXCEPTION;
1587 clear_pending_exception_if_not_oom(CHECK);
1588 if (CompileTheWorldPreloadClasses && k.not_null()) {
1589 ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD);
1590 if (HAS_PENDING_EXCEPTION) {
1591 // If something went wrong in preloading we just ignore it
1592 clear_pending_exception_if_not_oom(CHECK);
1593 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
1594 }
1595 }
1596
1597 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
1598 if (k.is_null() || exception_occurred) {
1599 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
1600 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
1601 } else {
1602 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
1603 // Preload all classes to get around uncommon traps
1604 // Iterate over all methods in class
1605 int comp_level = CompilationPolicy::policy()->initial_compile_level();
1606 for (int n = 0; n < k->methods()->length(); n++) {
1607 methodHandle m (THREAD, k->methods()->at(n));
1608 if (can_be_compiled(m, comp_level)) {
1609 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
1610 // Give sweeper a chance to keep up with CTW
1611 VM_ForceSafepoint op;
1612 VMThread::execute(&op);
1613 _codecache_sweep_counter = 0;
1614 }
1615 // Force compilation
1616 CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
1617 methodHandle(), 0, "CTW", THREAD);
1618 if (HAS_PENDING_EXCEPTION) {
1619 clear_pending_exception_if_not_oom(CHECK);
1620 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1621 } else {
1622 _compile_the_world_method_counter++;
1623 }
1624 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
1625 // Clobber the first compile and force second tier compilation
1626 nmethod* nm = m->code();
1627 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1628 // Throw out the code so that the code cache doesn't fill up
1629 nm->make_not_entrant();
1630 m->clear_code();
1631 }
1632 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
1633 methodHandle(), 0, "CTW", THREAD);
1634 if (HAS_PENDING_EXCEPTION) {
1635 clear_pending_exception_if_not_oom(CHECK);
1636 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1637 } else {
1638 _compile_the_world_method_counter++;
1639 }
1640 }
1641 } else {
1642 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1643 }
1644
1645 nmethod* nm = m->code();
1646 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1647 // Throw out the code so that the code cache doesn't fill up
1648 nm->make_not_entrant();
1649 m->clear_code();
1650 }
1651 }
1652 }
1653 }
1654 }
1655 }
1656 }
1657
1658 #endif //PRODUCT
1659
1660 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1661 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1662 void PerfClassTraceTime::initialize() {
1663 if (!UsePerfData) return;
1664
1665 if (_eventp != NULL) {
1666 // increment the event counter
1667 _eventp->inc();
1668 }
1669
1670 // stop the current active thread-local timer to measure inclusive time
1671 _prev_active_event = -1;
1672 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1673 if (_timers[i].is_active()) {
1674 assert(_prev_active_event == -1, "should have only one active timer");
1675 _prev_active_event = i;
1676 _timers[i].stop();
1677 }
1678 }
1679
1680 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1681 // start the inclusive timer if not recursively called
1682 _t.start();
1683 }
1684
1685 // start thread-local timer of the given event type
1686 if (!_timers[_event_type].is_active()) {
1687 _timers[_event_type].start();
1688 }
1689 }
1690
1691 PerfClassTraceTime::~PerfClassTraceTime() {
1692 if (!UsePerfData) return;
1693
1694 // stop the thread-local timer as the event completes
1695 // and resume the thread-local timer of the event next on the stack
1696 _timers[_event_type].stop();
1697 jlong selftime = _timers[_event_type].ticks();
1698
1699 if (_prev_active_event >= 0) {
1700 _timers[_prev_active_event].start();
1701 }
1702
1703 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1704
1705 // increment the counters only on the leaf call
1706 _t.stop();
1707 _timep->inc(_t.ticks());
1708 if (_selftimep != NULL) {
1709 _selftimep->inc(selftime);
1710 }
1711 // add all class loading related event selftime to the accumulated time counter
1712 ClassLoader::perf_accumulated_time()->inc(selftime);
1713
1714 // reset the timer
1715 _timers[_event_type].reset();
1716 }