1 /*
2 * Copyright (c) 1997, 2015, 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/imageFile.hpp"
32 #include "classfile/javaClasses.hpp"
33 #include "classfile/systemDictionary.hpp"
34 #include "classfile/vmSymbols.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "gc_interface/collectedHeap.inline.hpp"
37 #include "interpreter/bytecodeStream.hpp"
38 #include "interpreter/oopMapCache.hpp"
39 #include "memory/allocation.inline.hpp"
40 #include "memory/filemap.hpp"
41 #include "memory/generation.hpp"
42 #include "memory/oopFactory.hpp"
43 #include "memory/universe.inline.hpp"
44 #include "oops/instanceKlass.hpp"
45 #include "oops/instanceRefKlass.hpp"
46 #include "oops/oop.inline.hpp"
47 #include "oops/symbol.hpp"
48 #include "prims/jvm_misc.hpp"
49 #include "runtime/arguments.hpp"
50 #include "runtime/compilationPolicy.hpp"
51 #include "runtime/fprofiler.hpp"
52 #include "runtime/handles.hpp"
53 #include "runtime/handles.inline.hpp"
54 #include "runtime/init.hpp"
55 #include "runtime/interfaceSupport.hpp"
56 #include "runtime/java.hpp"
57 #include "runtime/javaCalls.hpp"
58 #include "runtime/os.hpp"
59 #include "runtime/threadCritical.hpp"
60 #include "runtime/timer.hpp"
61 #include "services/management.hpp"
62 #include "services/threadService.hpp"
63 #include "utilities/events.hpp"
64 #include "utilities/hashtable.inline.hpp"
65 #include "utilities/macros.hpp"
66 #if INCLUDE_CDS
67 #include "classfile/sharedPathsMiscInfo.hpp"
68 #include "classfile/sharedClassUtil.hpp"
69 #endif
70
71
72 // Entry points in zip.dll for loading zip/jar file entries and image file entries
73
74 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg);
75 typedef void (JNICALL *ZipClose_t)(jzfile *zip);
76 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
77 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
78 typedef jboolean (JNICALL *ReadMappedEntry_t)(jzfile *zip, jzentry *entry, unsigned char **buf, char *namebuf);
79 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n);
80 typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg);
81 typedef jint (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len);
82
83 static ZipOpen_t ZipOpen = NULL;
84 static ZipClose_t ZipClose = NULL;
85 static FindEntry_t FindEntry = NULL;
86 static ReadEntry_t ReadEntry = NULL;
87 static ReadMappedEntry_t ReadMappedEntry = NULL;
88 static GetNextEntry_t GetNextEntry = NULL;
89 static canonicalize_fn_t CanonicalizeEntry = NULL;
90 static ZipInflateFully_t ZipInflateFully = NULL;
91 static Crc32_t Crc32 = NULL;
92
93 // Globals
94
95 PerfCounter* ClassLoader::_perf_accumulated_time = NULL;
96 PerfCounter* ClassLoader::_perf_classes_inited = NULL;
97 PerfCounter* ClassLoader::_perf_class_init_time = NULL;
98 PerfCounter* ClassLoader::_perf_class_init_selftime = NULL;
99 PerfCounter* ClassLoader::_perf_classes_verified = NULL;
100 PerfCounter* ClassLoader::_perf_class_verify_time = NULL;
101 PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL;
102 PerfCounter* ClassLoader::_perf_classes_linked = NULL;
103 PerfCounter* ClassLoader::_perf_class_link_time = NULL;
104 PerfCounter* ClassLoader::_perf_class_link_selftime = NULL;
105 PerfCounter* ClassLoader::_perf_class_parse_time = NULL;
106 PerfCounter* ClassLoader::_perf_class_parse_selftime = NULL;
107 PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL;
108 PerfCounter* ClassLoader::_perf_shared_classload_time = NULL;
109 PerfCounter* ClassLoader::_perf_sys_classload_time = NULL;
110 PerfCounter* ClassLoader::_perf_app_classload_time = NULL;
111 PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL;
112 PerfCounter* ClassLoader::_perf_app_classload_count = NULL;
113 PerfCounter* ClassLoader::_perf_define_appclasses = NULL;
114 PerfCounter* ClassLoader::_perf_define_appclass_time = NULL;
115 PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL;
116 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL;
117 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL;
118 PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
119 PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
120 PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
121 PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
122 PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
123 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL;
124 PerfCounter* ClassLoader::_isUnsyncloadClass = NULL;
125 PerfCounter* ClassLoader::_load_instance_class_failCounter = NULL;
126
127 ClassPathEntry* ClassLoader::_first_entry = NULL;
128 ClassPathEntry* ClassLoader::_last_entry = NULL;
129 int ClassLoader::_num_entries = 0;
130 PackageHashtable* ClassLoader::_package_hash_table = NULL;
131
132 #if INCLUDE_CDS
133 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL;
134 #endif
135 // helper routines
136 bool string_starts_with(const char* str, const char* str_to_find) {
137 size_t str_len = strlen(str);
138 size_t str_to_find_len = strlen(str_to_find);
139 if (str_to_find_len > str_len) {
140 return false;
141 }
142 return (strncmp(str, str_to_find, str_to_find_len) == 0);
143 }
144
145 bool string_ends_with(const char* str, const char* str_to_find) {
146 size_t str_len = strlen(str);
147 size_t str_to_find_len = strlen(str_to_find);
148 if (str_to_find_len > str_len) {
149 return false;
150 }
151 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
152 }
153
154
155 ClassPathEntry::ClassPathEntry() {
156 set_next(NULL);
157 }
158
159
160 bool ClassPathEntry::is_lazy() {
161 return false;
162 }
163
164 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() {
165 char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
166 strcpy(copy, dir);
167 _dir = copy;
168 }
169
170
171 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
172 // construct full path name
173 char path[JVM_MAXPATHLEN];
174 if (jio_snprintf(path, sizeof(path), "%s%s%s", _dir, os::file_separator(), name) == -1) {
175 return NULL;
176 }
177 // check if file exists
178 struct stat st;
179 if (os::stat(path, &st) == 0) {
180 #if INCLUDE_CDS
181 if (DumpSharedSpaces) {
182 // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so
183 // we should never find a file underneath it -- unless user has added a new file while we are running
184 // the dump, in which case let's quit!
185 ShouldNotReachHere();
186 }
187 #endif
188 // found file, open it
189 int file_handle = os::open(path, 0, 0);
190 if (file_handle != -1) {
191 // read contents into resource array
192 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
193 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
194 // close file
195 os::close(file_handle);
196 // construct ClassFileStream
197 if (num_read == (size_t)st.st_size) {
198 if (UsePerfData) {
199 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
200 }
201 return new ClassFileStream(buffer, st.st_size, _dir); // Resource allocated
202 }
203 }
204 }
205 return NULL;
206 }
207
208
209 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name) : ClassPathEntry() {
210 _zip = zip;
211 char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
212 strcpy(copy, zip_name);
213 _zip_name = copy;
214 }
215
216 ClassPathZipEntry::~ClassPathZipEntry() {
217 if (ZipClose != NULL) {
218 (*ZipClose)(_zip);
219 }
220 FREE_C_HEAP_ARRAY(char, _zip_name);
221 }
222
223 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
224 // enable call to C land
225 JavaThread* thread = JavaThread::current();
226 ThreadToNativeFromVM ttn(thread);
227 // check whether zip archive contains name
228 jint name_len;
229 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
230 if (entry == NULL) return NULL;
231 u1* buffer;
232 char name_buf[128];
233 char* filename;
234 if (name_len < 128) {
235 filename = name_buf;
236 } else {
237 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
238 }
239
240 // file found, get pointer to the entry in mmapped jar file.
241 if (ReadMappedEntry == NULL ||
242 !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) {
243 // mmapped access not available, perhaps due to compression,
244 // read contents into resource array
245 int size = (*filesize) + ((nul_terminate) ? 1 : 0);
246 buffer = NEW_RESOURCE_ARRAY(u1, size);
247 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
248 }
249
250 // return result
251 if (nul_terminate) {
252 buffer[*filesize] = 0;
253 }
254 return buffer;
255 }
256
257 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
258 jint filesize;
259 u1* buffer = open_entry(name, &filesize, false, CHECK_NULL);
260 if (buffer == NULL) {
261 return NULL;
262 }
263 if (UsePerfData) {
264 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
265 }
266 return new ClassFileStream(buffer, filesize, _zip_name); // Resource allocated
267 }
268
269 // invoke function for each entry in the zip file
270 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
271 JavaThread* thread = JavaThread::current();
272 HandleMark handle_mark(thread);
273 ThreadToNativeFromVM ttn(thread);
274 for (int n = 0; ; n++) {
275 jzentry * ze = ((*GetNextEntry)(_zip, n));
276 if (ze == NULL) break;
277 (*f)(ze->name, context);
278 }
279 }
280
281 LazyClassPathEntry::LazyClassPathEntry(const char* path, const struct stat* st, bool throw_exception) : ClassPathEntry() {
282 _path = os::strdup_check_oom(path);
283 _st = *st;
284 _resolved_entry = NULL;
285 _has_error = false;
286 _throw_exception = throw_exception;
287 }
288
289 LazyClassPathEntry::~LazyClassPathEntry() {
290 os::free((void*)_path);
291 }
292
293 bool LazyClassPathEntry::is_jar_file() {
294 size_t len = strlen(_path);
295 if (len < 4 || strcmp(_path + len - 4, ".jar") != 0) return false;
296 return ((_st.st_mode & S_IFREG) == S_IFREG);
297 }
298
299 ClassPathEntry* LazyClassPathEntry::resolve_entry(TRAPS) {
300 if (_resolved_entry != NULL) {
301 return (ClassPathEntry*) _resolved_entry;
302 }
303 ClassPathEntry* new_entry = NULL;
304 new_entry = ClassLoader::create_class_path_entry(_path, &_st, false, _throw_exception, CHECK_NULL);
305 if (!_throw_exception && new_entry == NULL) {
306 assert(!HAS_PENDING_EXCEPTION, "must be");
307 return NULL;
308 }
309 {
310 ThreadCritical tc;
311 if (_resolved_entry == NULL) {
312 _resolved_entry = new_entry;
313 return new_entry;
314 }
315 }
316 assert(_resolved_entry != NULL, "bug in MT-safe resolution logic");
317 delete new_entry;
318 return (ClassPathEntry*) _resolved_entry;
319 }
320
321 ClassFileStream* LazyClassPathEntry::open_stream(const char* name, TRAPS) {
322 if (_has_error) {
323 return NULL;
324 }
325 ClassPathEntry* cpe = resolve_entry(THREAD);
326 if (cpe == NULL) {
327 _has_error = true;
328 return NULL;
329 } else {
330 return cpe->open_stream(name, THREAD);
331 }
332 }
333
334 bool LazyClassPathEntry::is_lazy() {
335 return true;
336 }
337
338 u1* LazyClassPathEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
339 if (_has_error) {
340 return NULL;
341 }
342 ClassPathEntry* cpe = resolve_entry(THREAD);
343 if (cpe == NULL) {
344 _has_error = true;
345 return NULL;
346 } else if (cpe->is_jar_file()) {
347 return ((ClassPathZipEntry*)cpe)->open_entry(name, filesize, nul_terminate,THREAD);
348 } else {
349 ShouldNotReachHere();
350 *filesize = 0;
351 return NULL;
352 }
353 }
354
355 ClassPathImageEntry::ClassPathImageEntry(char* name) : ClassPathEntry(), _image(new ImageFile(name)) {
356 bool opened = _image->open();
357 if (!opened) {
358 _image = NULL;
359 }
360 }
361
362 ClassPathImageEntry::~ClassPathImageEntry() {
363 if (_image) {
364 _image->close();
365 _image = NULL;
366 }
367 }
368
369 const char* ClassPathImageEntry::name() {
370 return _image ? _image->name() : "";
371 }
372
373 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
374 u1* buffer;
375 u8 size;
376 _image->get_resource(name, buffer, size);
377
378 if (buffer) {
379 if (UsePerfData) {
380 ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
381 }
382 return new ClassFileStream(buffer, (int)size, (char*)name); // Resource allocated
383 }
384
385 return NULL;
386 }
387
388 #ifndef PRODUCT
389 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) {
390 tty->print_cr("CompileTheWorld : Compiling all classes in %s", name());
391 tty->cr();
392 const ImageStrings strings = _image->get_strings();
393 // Retrieve each path component string.
394 u4 count = _image->get_location_count();
395 for (u4 i = 0; i < count; i++) {
396 u1* location_data = _image->get_location_data(i);
397
398 if (location_data) {
399 ImageLocation location(location_data);
400 const char* parent = location.get_attribute(ImageLocation::ATTRIBUTE_PARENT, strings);
401 const char* base = location.get_attribute(ImageLocation::ATTRIBUTE_BASE, strings);
402 const char* extension = location.get_attribute(ImageLocation::ATTRIBUTE_EXTENSION, strings);
403 assert((strlen(parent) + strlen(base) + strlen(extension)) < JVM_MAXPATHLEN, "path exceeds buffer");
404 char path[JVM_MAXPATHLEN];
405 strcpy(path, parent);
406 strcat(path, base);
407 strcat(path, extension);
408 ClassLoader::compile_the_world_in(path, loader, CHECK);
409 }
410 }
411 if (HAS_PENDING_EXCEPTION) {
412 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
413 CLEAR_PENDING_EXCEPTION;
414 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
415 tty->print_cr("Increase class metadata storage if a limit was set");
416 } else {
417 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
418 }
419 }
420 }
421
422 bool ClassPathImageEntry::is_jrt() {
423 return string_ends_with(name(), "bootmodules.jimage");
424 }
425 #endif
426
427 #if INCLUDE_CDS
428 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
429 assert(DumpSharedSpaces, "only called at dump time");
430 tty->print_cr("Hint: enable -XX:+TraceClassPaths to diagnose the failure");
431 vm_exit_during_initialization(error, message);
432 }
433 #endif
434
435 void ClassLoader::trace_class_path(const char* msg, const char* name) {
436 if (!TraceClassPaths) {
437 return;
438 }
439
440 if (msg) {
441 tty->print("%s", msg);
442 }
443 if (name) {
444 if (strlen(name) < 256) {
445 tty->print("%s", name);
446 } else {
447 // For very long paths, we need to print each character separately,
448 // as print_cr() has a length limit
449 while (name[0] != '\0') {
450 tty->print("%c", name[0]);
451 name++;
452 }
453 }
454 }
455 if (msg && msg[0] == '[') {
456 tty->print_cr("]");
457 } else {
458 tty->cr();
459 }
460 }
461
462 #if INCLUDE_CDS
463 void ClassLoader::check_shared_classpath(const char *path) {
464 if (strcmp(path, "") == 0) {
465 exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
466 }
467
468 struct stat st;
469 if (os::stat(path, &st) == 0) {
470 if ((st.st_mode & S_IFREG) != S_IFREG) { // is directory
471 if (!os::dir_is_empty(path)) {
472 tty->print_cr("Error: non-empty directory '%s'", path);
473 exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL);
474 }
475 }
476 }
477 }
478 #endif
479
480 void ClassLoader::setup_bootstrap_search_path() {
481 assert(_first_entry == NULL, "should not setup bootstrap class search path twice");
482 const char* sys_class_path = Arguments::get_sysclasspath();
483 if (PrintSharedArchiveAndExit) {
484 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
485 // the same as the bootcp of the shared archive.
486 } else {
487 trace_class_path("[Bootstrap loader class path=", sys_class_path);
488 }
489 #if INCLUDE_CDS
490 if (DumpSharedSpaces) {
491 _shared_paths_misc_info->add_boot_classpath(sys_class_path);
492 }
493 #endif
494 setup_search_path(sys_class_path);
495 }
496
497 #if INCLUDE_CDS
498 int ClassLoader::get_shared_paths_misc_info_size() {
499 return _shared_paths_misc_info->get_used_bytes();
500 }
501
502 void* ClassLoader::get_shared_paths_misc_info() {
503 return _shared_paths_misc_info->buffer();
504 }
505
506 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
507 SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
508 bool result = checker->check();
509 delete checker;
510 return result;
511 }
512 #endif
513
514 void ClassLoader::setup_search_path(const char *class_path) {
515 int offset = 0;
516 int len = (int)strlen(class_path);
517 int end = 0;
518
519 // Iterate over class path entries
520 for (int start = 0; start < len; start = end) {
521 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
522 end++;
523 }
524 EXCEPTION_MARK;
525 ResourceMark rm(THREAD);
526 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
527 strncpy(path, &class_path[start], end - start);
528 path[end - start] = '\0';
529 update_class_path_entry_list(path, false);
530 #if INCLUDE_CDS
531 if (DumpSharedSpaces) {
532 check_shared_classpath(path);
533 }
534 #endif
535 while (class_path[end] == os::path_separator()[0]) {
536 end++;
537 }
538 }
539 }
540
541 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
542 bool lazy, bool throw_exception, TRAPS) {
543 JavaThread* thread = JavaThread::current();
544 if (lazy) {
545 return new LazyClassPathEntry(path, st, throw_exception);
546 }
547 ClassPathEntry* new_entry = NULL;
548 if ((st->st_mode & S_IFREG) == S_IFREG) {
549 // Regular file, should be a zip or image file
550 // Canonicalized filename
551 char canonical_path[JVM_MAXPATHLEN];
552 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
553 // This matches the classic VM
554 if (throw_exception) {
555 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
556 } else {
557 return NULL;
558 }
559 }
560 // TODO - add proper criteria for selecting image file
561 ClassPathImageEntry* entry = new ClassPathImageEntry(canonical_path);
562 if (entry->is_open()) {
563 new_entry = entry;
564 } else {
565 char* error_msg = NULL;
566 jzfile* zip;
567 {
568 // enable call to C land
569 ThreadToNativeFromVM ttn(thread);
570 HandleMark hm(thread);
571 zip = (*ZipOpen)(canonical_path, &error_msg);
572 }
573 if (zip != NULL && error_msg == NULL) {
574 new_entry = new ClassPathZipEntry(zip, path);
575 } else {
576 ResourceMark rm(thread);
577 char *msg;
578 if (error_msg == NULL) {
579 msg = NEW_RESOURCE_ARRAY(char, strlen(path) + 128); ;
580 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
581 } else {
582 int len = (int)(strlen(path) + strlen(error_msg) + 128);
583 msg = NEW_RESOURCE_ARRAY(char, len); ;
584 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
585 }
586 if (throw_exception) {
587 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
588 } else {
589 return NULL;
590 }
591 }
592 }
593 if (TraceClassLoading || TraceClassPaths) {
594 tty->print_cr("[Opened %s]", path);
595 }
596 } else {
597 // Directory
598 new_entry = new ClassPathDirEntry(path);
599 if (TraceClassLoading) {
600 tty->print_cr("[Path %s]", path);
601 }
602 }
603 return new_entry;
604 }
605
606
607 // Create a class path zip entry for a given path (return NULL if not found
608 // or zip/JAR file cannot be opened)
609 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) {
610 // check for a regular file
611 struct stat st;
612 if (os::stat(path, &st) == 0) {
613 if ((st.st_mode & S_IFREG) == S_IFREG) {
614 char canonical_path[JVM_MAXPATHLEN];
615 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
616 char* error_msg = NULL;
617 jzfile* zip;
618 {
619 // enable call to C land
620 JavaThread* thread = JavaThread::current();
621 ThreadToNativeFromVM ttn(thread);
622 HandleMark hm(thread);
623 zip = (*ZipOpen)(canonical_path, &error_msg);
624 }
625 if (zip != NULL && error_msg == NULL) {
626 // create using canonical path
627 return new ClassPathZipEntry(zip, canonical_path);
628 }
629 }
630 }
631 }
632 return NULL;
633 }
634
635 // returns true if entry already on class path
636 bool ClassLoader::contains_entry(ClassPathEntry *entry) {
637 ClassPathEntry* e = _first_entry;
638 while (e != NULL) {
639 // assume zip entries have been canonicalized
640 if (strcmp(entry->name(), e->name()) == 0) {
641 return true;
642 }
643 e = e->next();
644 }
645 return false;
646 }
647
648 void ClassLoader::add_to_list(ClassPathEntry *new_entry) {
649 if (new_entry != NULL) {
650 if (_last_entry == NULL) {
651 _first_entry = _last_entry = new_entry;
652 } else {
653 _last_entry->set_next(new_entry);
654 _last_entry = new_entry;
655 }
656 }
657 _num_entries ++;
658 }
659
660 // Returns true IFF the file/dir exists and the entry was successfully created.
661 bool ClassLoader::update_class_path_entry_list(const char *path,
662 bool check_for_duplicates,
663 bool throw_exception) {
664 struct stat st;
665 if (os::stat(path, &st) == 0) {
666 // File or directory found
667 ClassPathEntry* new_entry = NULL;
668 Thread* THREAD = Thread::current();
669 new_entry = create_class_path_entry(path, &st, LazyBootClassLoader, throw_exception, CHECK_(false));
670 if (new_entry == NULL) {
671 return false;
672 }
673 // The kernel VM adds dynamically to the end of the classloader path and
674 // doesn't reorder the bootclasspath which would break java.lang.Package
675 // (see PackageInfo).
676 // Add new entry to linked list
677 if (!check_for_duplicates || !contains_entry(new_entry)) {
678 ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry);
679 }
680 return true;
681 } else {
682 #if INCLUDE_CDS
683 if (DumpSharedSpaces) {
684 _shared_paths_misc_info->add_nonexist_path(path);
685 }
686 #endif
687 return false;
688 }
689 }
690
691 void ClassLoader::print_bootclasspath() {
692 ClassPathEntry* e = _first_entry;
693 tty->print("[bootclasspath= ");
694 while (e != NULL) {
695 tty->print("%s ;", e->name());
696 e = e->next();
697 }
698 tty->print_cr("]");
699 }
700
701 void ClassLoader::load_zip_library() {
702 assert(ZipOpen == NULL, "should not load zip library twice");
703 // First make sure native library is loaded
704 os::native_java_library();
705 // Load zip library
706 char path[JVM_MAXPATHLEN];
707 char ebuf[1024];
708 void* handle = NULL;
709 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
710 handle = os::dll_load(path, ebuf, sizeof ebuf);
711 }
712 if (handle == NULL) {
713 vm_exit_during_initialization("Unable to load ZIP library", path);
714 }
715 // Lookup zip entry points
716 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
717 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
718 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
719 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
720 ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, os::dll_lookup(handle, "ZIP_ReadMappedEntry"));
721 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
722 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
723 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
724
725 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
726 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
727 GetNextEntry == NULL || Crc32 == NULL) {
728 vm_exit_during_initialization("Corrupted ZIP library", path);
729 }
730
731 if (ZipInflateFully == NULL) {
732 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
733 }
734
735 // Lookup canonicalize entry in libjava.dll
736 void *javalib_handle = os::native_java_library();
737 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
738 // This lookup only works on 1.3. Do not check for non-null here
739 }
740
741 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
742 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
743 }
744
745 int ClassLoader::crc32(int crc, const char* buf, int len) {
746 assert(Crc32 != NULL, "ZIP_CRC32 is not found");
747 return (*Crc32)(crc, (const jbyte*)buf, len);
748 }
749
750 // PackageInfo data exists in order to support the java.lang.Package
751 // class. A Package object provides information about a java package
752 // (version, vendor, etc.) which originates in the manifest of the jar
753 // file supplying the package. For application classes, the ClassLoader
754 // object takes care of this.
755
756 // For system (boot) classes, the Java code in the Package class needs
757 // to be able to identify which source jar file contained the boot
758 // class, so that it can extract the manifest from it. This table
759 // identifies java packages with jar files in the boot classpath.
760
761 // Because the boot classpath cannot change, the classpath index is
762 // sufficient to identify the source jar file or directory. (Since
763 // directories have no manifests, the directory name is not required,
764 // but is available.)
765
766 // When using sharing -- the pathnames of entries in the boot classpath
767 // may not be the same at runtime as they were when the archive was
768 // created (NFS, Samba, etc.). The actual files and directories named
769 // in the classpath must be the same files, in the same order, even
770 // though the exact name is not the same.
771
772 class PackageInfo: public BasicHashtableEntry<mtClass> {
773 public:
774 const char* _pkgname; // Package name
775 int _classpath_index; // Index of directory or JAR file loaded from
776
777 PackageInfo* next() {
778 return (PackageInfo*)BasicHashtableEntry<mtClass>::next();
779 }
780
781 const char* pkgname() { return _pkgname; }
782 void set_pkgname(char* pkgname) { _pkgname = pkgname; }
783
784 const char* filename() {
785 return ClassLoader::classpath_entry(_classpath_index)->name();
786 }
787
788 void set_index(int index) {
789 _classpath_index = index;
790 }
791 };
792
793
794 class PackageHashtable : public BasicHashtable<mtClass> {
795 private:
796 inline unsigned int compute_hash(const char *s, int n) {
797 unsigned int val = 0;
798 while (--n >= 0) {
799 val = *s++ + 31 * val;
800 }
801 return val;
802 }
803
804 PackageInfo* bucket(int index) {
805 return (PackageInfo*)BasicHashtable<mtClass>::bucket(index);
806 }
807
808 PackageInfo* get_entry(int index, unsigned int hash,
809 const char* pkgname, size_t n) {
810 for (PackageInfo* pp = bucket(index); pp != NULL; pp = pp->next()) {
811 if (pp->hash() == hash &&
812 strncmp(pkgname, pp->pkgname(), n) == 0 &&
813 pp->pkgname()[n] == '\0') {
814 return pp;
815 }
816 }
817 return NULL;
818 }
819
820 public:
821 PackageHashtable(int table_size)
822 : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo)) {}
823
824 PackageHashtable(int table_size, HashtableBucket<mtClass>* t, int number_of_entries)
825 : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo), t, number_of_entries) {}
826
827 PackageInfo* get_entry(const char* pkgname, int n) {
828 unsigned int hash = compute_hash(pkgname, n);
829 return get_entry(hash_to_index(hash), hash, pkgname, n);
830 }
831
832 PackageInfo* new_entry(char* pkgname, int n) {
833 unsigned int hash = compute_hash(pkgname, n);
834 PackageInfo* pp;
835 pp = (PackageInfo*)BasicHashtable<mtClass>::new_entry(hash);
836 pp->set_pkgname(pkgname);
837 return pp;
838 }
839
840 void add_entry(PackageInfo* pp) {
841 int index = hash_to_index(pp->hash());
842 BasicHashtable<mtClass>::add_entry(index, pp);
843 }
844
845 void copy_pkgnames(const char** packages) {
846 int n = 0;
847 for (int i = 0; i < table_size(); ++i) {
848 for (PackageInfo* pp = bucket(i); pp != NULL; pp = pp->next()) {
849 packages[n++] = pp->pkgname();
850 }
851 }
852 assert(n == number_of_entries(), "just checking");
853 }
854
855 CDS_ONLY(void copy_table(char** top, char* end, PackageHashtable* table);)
856 };
857
858 #if INCLUDE_CDS
859 void PackageHashtable::copy_table(char** top, char* end,
860 PackageHashtable* table) {
861 // Copy (relocate) the table to the shared space.
862 BasicHashtable<mtClass>::copy_table(top, end);
863
864 // Calculate the space needed for the package name strings.
865 int i;
866 intptr_t* tableSize = (intptr_t*)(*top);
867 *top += sizeof(intptr_t); // For table size
868 char* tableStart = *top;
869
870 for (i = 0; i < table_size(); ++i) {
871 for (PackageInfo* pp = table->bucket(i);
872 pp != NULL;
873 pp = pp->next()) {
874 int n1 = (int)(strlen(pp->pkgname()) + 1);
875 if (*top + n1 >= end) {
876 report_out_of_shared_space(SharedMiscData);
877 }
878 pp->set_pkgname((char*)memcpy(*top, pp->pkgname(), n1));
879 *top += n1;
880 }
881 }
882 *top = (char*)align_size_up((intptr_t)*top, sizeof(HeapWord));
883 if (*top >= end) {
884 report_out_of_shared_space(SharedMiscData);
885 }
886
887 // Write table size
888 intptr_t len = *top - (char*)tableStart;
889 *tableSize = len;
890 }
891
892
893 void ClassLoader::copy_package_info_buckets(char** top, char* end) {
894 _package_hash_table->copy_buckets(top, end);
895 }
896
897 void ClassLoader::copy_package_info_table(char** top, char* end) {
898 _package_hash_table->copy_table(top, end, _package_hash_table);
899 }
900 #endif
901
902 PackageInfo* ClassLoader::lookup_package(const char *pkgname) {
903 const char *cp = strrchr(pkgname, '/');
904 if (cp != NULL) {
905 // Package prefix found
906 int n = cp - pkgname + 1;
907 return _package_hash_table->get_entry(pkgname, n);
908 }
909 return NULL;
910 }
911
912
913 bool ClassLoader::add_package(const char *pkgname, int classpath_index, TRAPS) {
914 assert(pkgname != NULL, "just checking");
915 // Bootstrap loader no longer holds system loader lock obj serializing
916 // load_instance_class and thereby add_package
917 {
918 MutexLocker ml(PackageTable_lock, THREAD);
919 // First check for previously loaded entry
920 PackageInfo* pp = lookup_package(pkgname);
921 if (pp != NULL) {
922 // Existing entry found, check source of package
923 pp->set_index(classpath_index);
924 return true;
925 }
926
927 const char *cp = strrchr(pkgname, '/');
928 if (cp != NULL) {
929 // Package prefix found
930 int n = cp - pkgname + 1;
931
932 char* new_pkgname = NEW_C_HEAP_ARRAY(char, n + 1, mtClass);
933 if (new_pkgname == NULL) {
934 return false;
935 }
936
937 memcpy(new_pkgname, pkgname, n);
938 new_pkgname[n] = '\0';
939 pp = _package_hash_table->new_entry(new_pkgname, n);
940 pp->set_index(classpath_index);
941
942 // Insert into hash table
943 _package_hash_table->add_entry(pp);
944 }
945 return true;
946 }
947 }
948
949
950 oop ClassLoader::get_system_package(const char* name, TRAPS) {
951 PackageInfo* pp;
952 {
953 MutexLocker ml(PackageTable_lock, THREAD);
954 pp = lookup_package(name);
955 }
956 if (pp == NULL) {
957 return NULL;
958 } else {
959 Handle p = java_lang_String::create_from_str(pp->filename(), THREAD);
960 return p();
961 }
962 }
963
964
965 objArrayOop ClassLoader::get_system_packages(TRAPS) {
966 ResourceMark rm(THREAD);
967 int nof_entries;
968 const char** packages;
969 {
970 MutexLocker ml(PackageTable_lock, THREAD);
971 // Allocate resource char* array containing package names
972 nof_entries = _package_hash_table->number_of_entries();
973 if ((packages = NEW_RESOURCE_ARRAY(const char*, nof_entries)) == NULL) {
974 return NULL;
975 }
976 _package_hash_table->copy_pkgnames(packages);
977 }
978 // Allocate objArray and fill with java.lang.String
979 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
980 nof_entries, CHECK_0);
981 objArrayHandle result(THREAD, r);
982 for (int i = 0; i < nof_entries; i++) {
983 Handle str = java_lang_String::create_from_str(packages[i], CHECK_0);
984 result->obj_at_put(i, str());
985 }
986
987 return result();
988 }
989
990
991 instanceKlassHandle ClassLoader::load_classfile(Symbol* h_name, TRAPS) {
992 ResourceMark rm(THREAD);
993 const char* class_name = h_name->as_C_string();
994 EventMark m("loading class %s", class_name);
995 ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion);
996
997 stringStream st;
998 // st.print() uses too much stack space while handling a StackOverflowError
999 // st.print("%s.class", h_name->as_utf8());
1000 st.print_raw(h_name->as_utf8());
1001 st.print_raw(".class");
1002 const char* file_name = st.as_string();
1003 ClassLoaderExt::Context context(class_name, file_name, THREAD);
1004
1005 // Lookup stream for parsing .class file
1006 ClassFileStream* stream = NULL;
1007 int classpath_index = 0;
1008 ClassPathEntry* e = NULL;
1009 instanceKlassHandle h;
1010 {
1011 PerfClassTraceTime vmtimer(perf_sys_class_lookup_time(),
1012 ((JavaThread*) THREAD)->get_thread_stat()->perf_timers_addr(),
1013 PerfClassTraceTime::CLASS_LOAD);
1014 e = _first_entry;
1015 while (e != NULL) {
1016 stream = e->open_stream(file_name, CHECK_NULL);
1017 if (!context.check(stream, classpath_index)) {
1018 return h; // NULL
1019 }
1020 if (stream != NULL) {
1021 break;
1022 }
1023 e = e->next();
1024 ++classpath_index;
1025 }
1026 }
1027
1028 if (stream != NULL) {
1029 // class file found, parse it
1030 ClassFileParser parser(stream);
1031 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1032 Handle protection_domain;
1033 TempNewSymbol parsed_name = NULL;
1034 instanceKlassHandle result = parser.parseClassFile(h_name,
1035 loader_data,
1036 protection_domain,
1037 parsed_name,
1038 context.should_verify(classpath_index),
1039 THREAD);
1040 if (HAS_PENDING_EXCEPTION) {
1041 ResourceMark rm;
1042 if (DumpSharedSpaces) {
1043 tty->print_cr("Preload Error: Failed to load %s", class_name);
1044 }
1045 return h;
1046 }
1047 h = context.record_result(classpath_index, e, result, THREAD);
1048 } else {
1049 if (DumpSharedSpaces) {
1050 tty->print_cr("Preload Warning: Cannot find %s", class_name);
1051 }
1052 }
1053
1054 return h;
1055 }
1056
1057
1058 void ClassLoader::create_package_info_table(HashtableBucket<mtClass> *t, int length,
1059 int number_of_entries) {
1060 assert(_package_hash_table == NULL, "One package info table allowed.");
1061 assert(length == package_hash_table_size * sizeof(HashtableBucket<mtClass>),
1062 "bad shared package info size.");
1063 _package_hash_table = new PackageHashtable(package_hash_table_size, t,
1064 number_of_entries);
1065 }
1066
1067
1068 void ClassLoader::create_package_info_table() {
1069 assert(_package_hash_table == NULL, "shouldn't have one yet");
1070 _package_hash_table = new PackageHashtable(package_hash_table_size);
1071 }
1072
1073
1074 // Initialize the class loader's access to methods in libzip. Parse and
1075 // process the boot classpath into a list ClassPathEntry objects. Once
1076 // this list has been created, it must not change order (see class PackageInfo)
1077 // it can be appended to and is by jvmti and the kernel vm.
1078
1079 void ClassLoader::initialize() {
1080 assert(_package_hash_table == NULL, "should have been initialized by now.");
1081 EXCEPTION_MARK;
1082
1083 if (UsePerfData) {
1084 // jvmstat performance counters
1085 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1086 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1087 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1088 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1089 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1090 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1091 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1092 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1093 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1094 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1095
1096 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1097 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1098 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1099 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1100 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1101 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1102 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1103 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1104 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1105 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1106 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1107 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1108 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1109
1110
1111 // The following performance counters are added for measuring the impact
1112 // of the bug fix of 6365597. They are mainly focused on finding out
1113 // the behavior of system & user-defined classloader lock, whether
1114 // ClassLoader.loadClass/findClass is being called synchronized or not.
1115 // Also two additional counters are created to see whether 'UnsyncloadClass'
1116 // flag is being set or not and how many times load_instance_class call
1117 // fails with linkageError etc.
1118 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1119 "systemLoaderLockContentionRate");
1120 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1121 "nonSystemLoaderLockContentionRate");
1122 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1123 "jvmFindLoadedClassNoLockCalls");
1124 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1125 "jvmDefineClassNoLockCalls");
1126
1127 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1128 "jniDefineClassNoLockCalls");
1129
1130 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1131 "unsafeDefineClassCalls");
1132
1133 NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet");
1134 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1135 "loadInstanceClassFailRate");
1136
1137 // increment the isUnsyncloadClass counter if UnsyncloadClass is set.
1138 if (UnsyncloadClass) {
1139 _isUnsyncloadClass->inc();
1140 }
1141 }
1142
1143 // lookup zip library entry points
1144 load_zip_library();
1145 #if INCLUDE_CDS
1146 // initialize search path
1147 if (DumpSharedSpaces) {
1148 _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
1149 }
1150 #endif
1151 setup_bootstrap_search_path();
1152 }
1153
1154 #if INCLUDE_CDS
1155 void ClassLoader::initialize_shared_path() {
1156 if (DumpSharedSpaces) {
1157 ClassLoaderExt::setup_search_paths();
1158 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1159 }
1160 }
1161 #endif
1162
1163 jlong ClassLoader::classloader_time_ms() {
1164 return UsePerfData ?
1165 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1166 }
1167
1168 jlong ClassLoader::class_init_count() {
1169 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1170 }
1171
1172 jlong ClassLoader::class_init_time_ms() {
1173 return UsePerfData ?
1174 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1175 }
1176
1177 jlong ClassLoader::class_verify_time_ms() {
1178 return UsePerfData ?
1179 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1180 }
1181
1182 jlong ClassLoader::class_link_count() {
1183 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1184 }
1185
1186 jlong ClassLoader::class_link_time_ms() {
1187 return UsePerfData ?
1188 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1189 }
1190
1191 int ClassLoader::compute_Object_vtable() {
1192 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1193 // code to determine actual value from file
1194 // Would be value '11' if finals were in vtable
1195 int JDK_1_2_Object_vtable_size = 5;
1196 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1197 }
1198
1199
1200 void classLoader_init() {
1201 ClassLoader::initialize();
1202 }
1203
1204
1205 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1206 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1207 if (CanonicalizeEntry != NULL) {
1208 JavaThread* THREAD = JavaThread::current();
1209 JNIEnv* env = THREAD->jni_environment();
1210 ResourceMark rm(THREAD);
1211
1212 // os::native_path writes into orig_copy
1213 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1214 strcpy(orig_copy, orig);
1215 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1216 return false;
1217 }
1218 } else {
1219 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1220 strncpy(out, orig, len);
1221 out[len - 1] = '\0';
1222 }
1223 return true;
1224 }
1225
1226 #ifndef PRODUCT
1227
1228 void ClassLoader::verify() {
1229 _package_hash_table->verify();
1230 }
1231
1232
1233 // CompileTheWorld
1234 //
1235 // Iterates over all class path entries and forces compilation of all methods
1236 // in all classes found. Currently, only zip/jar archives are searched.
1237 //
1238 // The classes are loaded by the Java level bootstrap class loader, and the
1239 // initializer is called. If DelayCompilationDuringStartup is true (default),
1240 // the interpreter will run the initialization code. Note that forcing
1241 // initialization in this way could potentially lead to initialization order
1242 // problems, in which case we could just force the initialization bit to be set.
1243
1244
1245 // We need to iterate over the contents of a zip/jar file, so we replicate the
1246 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1247 // since jzfile already has a void* definition.
1248 //
1249 // Note that this is only used in debug mode.
1250 //
1251 // HotSpot integration note:
1252 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1253
1254
1255 // JDK 1.3 version
1256 typedef struct real_jzentry { /* Zip file entry */
1257 char *name; /* entry name */
1258 jint time; /* modification time */
1259 jint size; /* size of uncompressed data */
1260 jint csize; /* size of compressed data (zero if uncompressed) */
1261 jint crc; /* crc of uncompressed data */
1262 char *comment; /* optional zip file comment */
1263 jbyte *extra; /* optional extra data */
1264 jint pos; /* position of LOC header (if negative) or data */
1265 } real_jzentry;
1266
1267 typedef struct real_jzfile { /* Zip file */
1268 char *name; /* zip file name */
1269 jint refs; /* number of active references */
1270 jint fd; /* open file descriptor */
1271 void *lock; /* read lock */
1272 char *comment; /* zip file comment */
1273 char *msg; /* zip error message */
1274 void *entries; /* array of hash cells */
1275 jint total; /* total number of entries */
1276 unsigned short *table; /* Hash chain heads: indexes into entries */
1277 jint tablelen; /* number of hash eads */
1278 real_jzfile *next; /* next zip file in search list */
1279 jzentry *cache; /* we cache the most recently freed jzentry */
1280 /* Information on metadata names in META-INF directory */
1281 char **metanames; /* array of meta names (may have null names) */
1282 jint metacount; /* number of slots in metanames array */
1283 /* If there are any per-entry comments, they are in the comments array */
1284 char **comments;
1285 } real_jzfile;
1286
1287 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1288 // For now we only compile all methods in all classes in zip/jar files
1289 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1290 tty->cr();
1291 }
1292
1293 bool ClassPathDirEntry::is_jrt() {
1294 return false;
1295 }
1296
1297 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1298 real_jzfile* zip = (real_jzfile*) _zip;
1299 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1300 tty->cr();
1301 // Iterate over all entries in zip file
1302 for (int n = 0; ; n++) {
1303 real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n));
1304 if (ze == NULL) break;
1305 ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1306 }
1307 if (HAS_PENDING_EXCEPTION) {
1308 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1309 CLEAR_PENDING_EXCEPTION;
1310 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1311 tty->print_cr("Increase class metadata storage if a limit was set");
1312 } else {
1313 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1314 }
1315 }
1316 }
1317
1318 bool ClassPathZipEntry::is_jrt() {
1319 return false;
1320 }
1321
1322 void LazyClassPathEntry::compile_the_world(Handle loader, TRAPS) {
1323 ClassPathEntry* cpe = resolve_entry(THREAD);
1324 if (cpe != NULL) {
1325 cpe->compile_the_world(loader, CHECK);
1326 }
1327 }
1328
1329 bool LazyClassPathEntry::is_jrt() {
1330 Thread* THREAD = Thread::current();
1331 ClassPathEntry* cpe = resolve_entry(THREAD);
1332 return (cpe != NULL) ? cpe->is_jar_file() : false;
1333 }
1334
1335 void ClassLoader::compile_the_world() {
1336 EXCEPTION_MARK;
1337 HandleMark hm(THREAD);
1338 ResourceMark rm(THREAD);
1339 // Make sure we don't run with background compilation
1340 BackgroundCompilation = false;
1341 // Find bootstrap loader
1342 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1343 // Iterate over all bootstrap class path entries
1344 ClassPathEntry* e = _first_entry;
1345 jlong start = os::javaTimeMillis();
1346 while (e != NULL) {
1347 // We stop at bootmodules.jimage, unless it is the first bootstrap path entry
1348 if (e->is_jrt() && e != _first_entry) break;
1349 e->compile_the_world(system_class_loader, CATCH);
1350 e = e->next();
1351 }
1352 jlong end = os::javaTimeMillis();
1353 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1354 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1355 {
1356 // Print statistics as if before normal exit:
1357 extern void print_statistics();
1358 print_statistics();
1359 }
1360 vm_exit(0);
1361 }
1362
1363 int ClassLoader::_compile_the_world_class_counter = 0;
1364 int ClassLoader::_compile_the_world_method_counter = 0;
1365 static int _codecache_sweep_counter = 0;
1366
1367 // Filter out all exceptions except OOMs
1368 static void clear_pending_exception_if_not_oom(TRAPS) {
1369 if (HAS_PENDING_EXCEPTION &&
1370 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1371 CLEAR_PENDING_EXCEPTION;
1372 }
1373 // The CHECK at the caller will propagate the exception out
1374 }
1375
1376 /**
1377 * Returns if the given method should be compiled when doing compile-the-world.
1378 *
1379 * TODO: This should be a private method in a CompileTheWorld class.
1380 */
1381 static bool can_be_compiled(methodHandle m, int comp_level) {
1382 assert(CompileTheWorld, "must be");
1383
1384 // It's not valid to compile a native wrapper for MethodHandle methods
1385 // that take a MemberName appendix since the bytecode signature is not
1386 // correct.
1387 vmIntrinsics::ID iid = m->intrinsic_id();
1388 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1389 return false;
1390 }
1391
1392 return CompilationPolicy::can_be_compiled(m, comp_level);
1393 }
1394
1395 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1396 if (string_ends_with(name, ".class")) {
1397 // We have a .class file
1398 int len = (int)strlen(name);
1399 char buffer[2048];
1400 strncpy(buffer, name, len - 6);
1401 buffer[len-6] = 0;
1402 // If the file has a period after removing .class, it's not really a
1403 // valid class file. The class loader will check everything else.
1404 if (strchr(buffer, '.') == NULL) {
1405 _compile_the_world_class_counter++;
1406 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
1407
1408 // Construct name without extension
1409 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
1410 // Use loader to load and initialize class
1411 Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
1412 instanceKlassHandle k (THREAD, ik);
1413 if (k.not_null() && !HAS_PENDING_EXCEPTION) {
1414 k->initialize(THREAD);
1415 }
1416 bool exception_occurred = HAS_PENDING_EXCEPTION;
1417 clear_pending_exception_if_not_oom(CHECK);
1418 if (CompileTheWorldPreloadClasses && k.not_null()) {
1419 ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD);
1420 if (HAS_PENDING_EXCEPTION) {
1421 // If something went wrong in preloading we just ignore it
1422 clear_pending_exception_if_not_oom(CHECK);
1423 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
1424 }
1425 }
1426
1427 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
1428 if (k.is_null() || exception_occurred) {
1429 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
1430 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
1431 } else {
1432 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
1433 // Preload all classes to get around uncommon traps
1434 // Iterate over all methods in class
1435 int comp_level = CompilationPolicy::policy()->initial_compile_level();
1436 for (int n = 0; n < k->methods()->length(); n++) {
1437 methodHandle m (THREAD, k->methods()->at(n));
1438 if (can_be_compiled(m, comp_level)) {
1439 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
1440 // Give sweeper a chance to keep up with CTW
1441 VM_ForceSafepoint op;
1442 VMThread::execute(&op);
1443 _codecache_sweep_counter = 0;
1444 }
1445 // Force compilation
1446 CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
1447 methodHandle(), 0, "CTW", THREAD);
1448 if (HAS_PENDING_EXCEPTION) {
1449 clear_pending_exception_if_not_oom(CHECK);
1450 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1451 } else {
1452 _compile_the_world_method_counter++;
1453 }
1454 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
1455 // Clobber the first compile and force second tier compilation
1456 nmethod* nm = m->code();
1457 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1458 // Throw out the code so that the code cache doesn't fill up
1459 nm->make_not_entrant();
1460 m->clear_code();
1461 }
1462 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
1463 methodHandle(), 0, "CTW", THREAD);
1464 if (HAS_PENDING_EXCEPTION) {
1465 clear_pending_exception_if_not_oom(CHECK);
1466 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1467 } else {
1468 _compile_the_world_method_counter++;
1469 }
1470 }
1471 } else {
1472 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1473 }
1474
1475 nmethod* nm = m->code();
1476 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1477 // Throw out the code so that the code cache doesn't fill up
1478 nm->make_not_entrant();
1479 m->clear_code();
1480 }
1481 }
1482 }
1483 }
1484 }
1485 }
1486 }
1487
1488 #endif //PRODUCT
1489
1490 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1491 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1492 void PerfClassTraceTime::initialize() {
1493 if (!UsePerfData) return;
1494
1495 if (_eventp != NULL) {
1496 // increment the event counter
1497 _eventp->inc();
1498 }
1499
1500 // stop the current active thread-local timer to measure inclusive time
1501 _prev_active_event = -1;
1502 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1503 if (_timers[i].is_active()) {
1504 assert(_prev_active_event == -1, "should have only one active timer");
1505 _prev_active_event = i;
1506 _timers[i].stop();
1507 }
1508 }
1509
1510 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1511 // start the inclusive timer if not recursively called
1512 _t.start();
1513 }
1514
1515 // start thread-local timer of the given event type
1516 if (!_timers[_event_type].is_active()) {
1517 _timers[_event_type].start();
1518 }
1519 }
1520
1521 PerfClassTraceTime::~PerfClassTraceTime() {
1522 if (!UsePerfData) return;
1523
1524 // stop the thread-local timer as the event completes
1525 // and resume the thread-local timer of the event next on the stack
1526 _timers[_event_type].stop();
1527 jlong selftime = _timers[_event_type].ticks();
1528
1529 if (_prev_active_event >= 0) {
1530 _timers[_prev_active_event].start();
1531 }
1532
1533 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1534
1535 // increment the counters only on the leaf call
1536 _t.stop();
1537 _timep->inc(_t.ticks());
1538 if (_selftimep != NULL) {
1539 _selftimep->inc(selftime);
1540 }
1541 // add all class loading related event selftime to the accumulated time counter
1542 ClassLoader::perf_accumulated_time()->inc(selftime);
1543
1544 // reset the timer
1545 _timers[_event_type].reset();
1546 }