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src/share/vm/classfile/classLoader.cpp@2c6ef90f030a
src/share/vm/classfile/classLoader.cpp
Mon, 07 Jul 2014 10:12:40 +0200
- author
- stefank
- date
- Mon, 07 Jul 2014 10:12:40 +0200
- changeset 6992
- 2c6ef90f030a
- parent 6680
- 78bbf4d43a14
- child 6868
- ca6d25be853b
- child 7089
- 6e0cb14ce59b
- permissions
- -rw-r--r--
8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com
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 */
25 #include "precompiled.hpp"
26 #include "classfile/classFileParser.hpp"
27 #include "classfile/classFileStream.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/javaClasses.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "gc_interface/collectedHeap.inline.hpp"
35 #include "interpreter/bytecodeStream.hpp"
36 #include "interpreter/oopMapCache.hpp"
37 #include "memory/allocation.inline.hpp"
38 #include "memory/generation.hpp"
39 #include "memory/oopFactory.hpp"
40 #include "memory/universe.inline.hpp"
41 #include "oops/instanceKlass.hpp"
42 #include "oops/instanceRefKlass.hpp"
43 #include "oops/oop.inline.hpp"
44 #include "oops/symbol.hpp"
45 #include "prims/jvm_misc.hpp"
46 #include "runtime/arguments.hpp"
47 #include "runtime/compilationPolicy.hpp"
48 #include "runtime/fprofiler.hpp"
49 #include "runtime/handles.hpp"
50 #include "runtime/handles.inline.hpp"
51 #include "runtime/init.hpp"
52 #include "runtime/interfaceSupport.hpp"
53 #include "runtime/java.hpp"
54 #include "runtime/javaCalls.hpp"
55 #include "runtime/threadCritical.hpp"
56 #include "runtime/timer.hpp"
57 #include "services/management.hpp"
58 #include "services/threadService.hpp"
59 #include "utilities/events.hpp"
60 #include "utilities/hashtable.hpp"
61 #include "utilities/hashtable.inline.hpp"
62 #ifdef TARGET_OS_FAMILY_linux
63 # include "os_linux.inline.hpp"
64 #endif
65 #ifdef TARGET_OS_FAMILY_solaris
66 # include "os_solaris.inline.hpp"
67 #endif
68 #ifdef TARGET_OS_FAMILY_windows
69 # include "os_windows.inline.hpp"
70 #endif
71 #ifdef TARGET_OS_FAMILY_aix
72 # include "os_aix.inline.hpp"
73 #endif
74 #ifdef TARGET_OS_FAMILY_bsd
75 # include "os_bsd.inline.hpp"
76 #endif
79 // Entry points in zip.dll for loading zip/jar file entries
81 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg);
82 typedef void (JNICALL *ZipClose_t)(jzfile *zip);
83 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
84 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
85 typedef jboolean (JNICALL *ReadMappedEntry_t)(jzfile *zip, jzentry *entry, unsigned char **buf, char *namebuf);
86 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n);
88 static ZipOpen_t ZipOpen = NULL;
89 static ZipClose_t ZipClose = NULL;
90 static FindEntry_t FindEntry = NULL;
91 static ReadEntry_t ReadEntry = NULL;
92 static ReadMappedEntry_t ReadMappedEntry = NULL;
93 static GetNextEntry_t GetNextEntry = NULL;
94 static canonicalize_fn_t CanonicalizeEntry = NULL;
96 // Globals
98 PerfCounter* ClassLoader::_perf_accumulated_time = NULL;
99 PerfCounter* ClassLoader::_perf_classes_inited = NULL;
100 PerfCounter* ClassLoader::_perf_class_init_time = NULL;
101 PerfCounter* ClassLoader::_perf_class_init_selftime = NULL;
102 PerfCounter* ClassLoader::_perf_classes_verified = NULL;
103 PerfCounter* ClassLoader::_perf_class_verify_time = NULL;
104 PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL;
105 PerfCounter* ClassLoader::_perf_classes_linked = NULL;
106 PerfCounter* ClassLoader::_perf_class_link_time = NULL;
107 PerfCounter* ClassLoader::_perf_class_link_selftime = NULL;
108 PerfCounter* ClassLoader::_perf_class_parse_time = NULL;
109 PerfCounter* ClassLoader::_perf_class_parse_selftime = NULL;
110 PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL;
111 PerfCounter* ClassLoader::_perf_shared_classload_time = NULL;
112 PerfCounter* ClassLoader::_perf_sys_classload_time = NULL;
113 PerfCounter* ClassLoader::_perf_app_classload_time = NULL;
114 PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL;
115 PerfCounter* ClassLoader::_perf_app_classload_count = NULL;
116 PerfCounter* ClassLoader::_perf_define_appclasses = NULL;
117 PerfCounter* ClassLoader::_perf_define_appclass_time = NULL;
118 PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL;
119 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL;
120 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL;
121 PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
122 PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
123 PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
124 PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
125 PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
126 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL;
127 PerfCounter* ClassLoader::_isUnsyncloadClass = NULL;
128 PerfCounter* ClassLoader::_load_instance_class_failCounter = NULL;
130 ClassPathEntry* ClassLoader::_first_entry = NULL;
131 ClassPathEntry* ClassLoader::_last_entry = NULL;
132 PackageHashtable* ClassLoader::_package_hash_table = NULL;
134 // helper routines
135 bool string_starts_with(const char* str, const char* str_to_find) {
136 size_t str_len = strlen(str);
137 size_t str_to_find_len = strlen(str_to_find);
138 if (str_to_find_len > str_len) {
139 return false;
140 }
141 return (strncmp(str, str_to_find, str_to_find_len) == 0);
142 }
144 bool string_ends_with(const char* str, const char* str_to_find) {
145 size_t str_len = strlen(str);
146 size_t str_to_find_len = strlen(str_to_find);
147 if (str_to_find_len > str_len) {
148 return false;
149 }
150 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
151 }
154 MetaIndex::MetaIndex(char** meta_package_names, int num_meta_package_names) {
155 if (num_meta_package_names == 0) {
156 _meta_package_names = NULL;
157 _num_meta_package_names = 0;
158 } else {
159 _meta_package_names = NEW_C_HEAP_ARRAY(char*, num_meta_package_names, mtClass);
160 _num_meta_package_names = num_meta_package_names;
161 memcpy(_meta_package_names, meta_package_names, num_meta_package_names * sizeof(char*));
162 }
163 }
166 MetaIndex::~MetaIndex() {
167 FREE_C_HEAP_ARRAY(char*, _meta_package_names, mtClass);
168 }
171 bool MetaIndex::may_contain(const char* class_name) {
172 if ( _num_meta_package_names == 0) {
173 return false;
174 }
175 size_t class_name_len = strlen(class_name);
176 for (int i = 0; i < _num_meta_package_names; i++) {
177 char* pkg = _meta_package_names[i];
178 size_t pkg_len = strlen(pkg);
179 size_t min_len = MIN2(class_name_len, pkg_len);
180 if (!strncmp(class_name, pkg, min_len)) {
181 return true;
182 }
183 }
184 return false;
185 }
188 ClassPathEntry::ClassPathEntry() {
189 set_next(NULL);
190 }
193 bool ClassPathEntry::is_lazy() {
194 return false;
195 }
197 ClassPathDirEntry::ClassPathDirEntry(char* dir) : ClassPathEntry() {
198 _dir = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
199 strcpy(_dir, dir);
200 }
203 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
204 // construct full path name
205 char path[JVM_MAXPATHLEN];
206 if (jio_snprintf(path, sizeof(path), "%s%s%s", _dir, os::file_separator(), name) == -1) {
207 return NULL;
208 }
209 // check if file exists
210 struct stat st;
211 if (os::stat(path, &st) == 0) {
212 // found file, open it
213 int file_handle = os::open(path, 0, 0);
214 if (file_handle != -1) {
215 // read contents into resource array
216 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
217 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
218 // close file
219 os::close(file_handle);
220 // construct ClassFileStream
221 if (num_read == (size_t)st.st_size) {
222 if (UsePerfData) {
223 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
224 }
225 return new ClassFileStream(buffer, st.st_size, _dir); // Resource allocated
226 }
227 }
228 }
229 return NULL;
230 }
233 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name) : ClassPathEntry() {
234 _zip = zip;
235 _zip_name = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
236 strcpy(_zip_name, zip_name);
237 }
239 ClassPathZipEntry::~ClassPathZipEntry() {
240 if (ZipClose != NULL) {
241 (*ZipClose)(_zip);
242 }
243 FREE_C_HEAP_ARRAY(char, _zip_name, mtClass);
244 }
246 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
247 // enable call to C land
248 JavaThread* thread = JavaThread::current();
249 ThreadToNativeFromVM ttn(thread);
250 // check whether zip archive contains name
251 jint filesize, name_len;
252 jzentry* entry = (*FindEntry)(_zip, name, &filesize, &name_len);
253 if (entry == NULL) return NULL;
254 u1* buffer;
255 char name_buf[128];
256 char* filename;
257 if (name_len < 128) {
258 filename = name_buf;
259 } else {
260 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
261 }
263 // file found, get pointer to class in mmaped jar file.
264 if (ReadMappedEntry == NULL ||
265 !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) {
266 // mmaped access not available, perhaps due to compression,
267 // read contents into resource array
268 buffer = NEW_RESOURCE_ARRAY(u1, filesize);
269 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
270 }
271 if (UsePerfData) {
272 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
273 }
274 // return result
275 return new ClassFileStream(buffer, filesize, _zip_name); // Resource allocated
276 }
278 // invoke function for each entry in the zip file
279 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
280 JavaThread* thread = JavaThread::current();
281 HandleMark handle_mark(thread);
282 ThreadToNativeFromVM ttn(thread);
283 for (int n = 0; ; n++) {
284 jzentry * ze = ((*GetNextEntry)(_zip, n));
285 if (ze == NULL) break;
286 (*f)(ze->name, context);
287 }
288 }
290 LazyClassPathEntry::LazyClassPathEntry(char* path, const struct stat* st) : ClassPathEntry() {
291 _path = strdup(path);
292 _st = *st;
293 _meta_index = NULL;
294 _resolved_entry = NULL;
295 _has_error = false;
296 }
298 bool LazyClassPathEntry::is_jar_file() {
299 return ((_st.st_mode & S_IFREG) == S_IFREG);
300 }
302 ClassPathEntry* LazyClassPathEntry::resolve_entry(TRAPS) {
303 if (_resolved_entry != NULL) {
304 return (ClassPathEntry*) _resolved_entry;
305 }
306 ClassPathEntry* new_entry = NULL;
307 new_entry = ClassLoader::create_class_path_entry(_path, &_st, false, CHECK_NULL);
308 {
309 ThreadCritical tc;
310 if (_resolved_entry == NULL) {
311 _resolved_entry = new_entry;
312 return new_entry;
313 }
314 }
315 assert(_resolved_entry != NULL, "bug in MT-safe resolution logic");
316 delete new_entry;
317 return (ClassPathEntry*) _resolved_entry;
318 }
320 ClassFileStream* LazyClassPathEntry::open_stream(const char* name, TRAPS) {
321 if (_meta_index != NULL &&
322 !_meta_index->may_contain(name)) {
323 return NULL;
324 }
325 if (_has_error) {
326 return NULL;
327 }
328 ClassPathEntry* cpe = resolve_entry(THREAD);
329 if (cpe == NULL) {
330 _has_error = true;
331 return NULL;
332 } else {
333 return cpe->open_stream(name, THREAD);
334 }
335 }
337 bool LazyClassPathEntry::is_lazy() {
338 return true;
339 }
341 static void print_meta_index(LazyClassPathEntry* entry,
342 GrowableArray<char*>& meta_packages) {
343 tty->print("[Meta index for %s=", entry->name());
344 for (int i = 0; i < meta_packages.length(); i++) {
345 if (i > 0) tty->print(" ");
346 tty->print("%s", meta_packages.at(i));
347 }
348 tty->print_cr("]");
349 }
352 void ClassLoader::setup_meta_index() {
353 // Set up meta index which allows us to open boot jars lazily if
354 // class data sharing is enabled
355 const char* known_version = "% VERSION 2";
356 char* meta_index_path = Arguments::get_meta_index_path();
357 char* meta_index_dir = Arguments::get_meta_index_dir();
358 FILE* file = fopen(meta_index_path, "r");
359 int line_no = 0;
360 if (file != NULL) {
361 ResourceMark rm;
362 LazyClassPathEntry* cur_entry = NULL;
363 GrowableArray<char*> boot_class_path_packages(10);
364 char package_name[256];
365 bool skipCurrentJar = false;
366 while (fgets(package_name, sizeof(package_name), file) != NULL) {
367 ++line_no;
368 // Remove trailing newline
369 package_name[strlen(package_name) - 1] = '\0';
370 switch(package_name[0]) {
371 case '%':
372 {
373 if ((line_no == 1) && (strcmp(package_name, known_version) != 0)) {
374 if (TraceClassLoading && Verbose) {
375 tty->print("[Unsupported meta index version]");
376 }
377 fclose(file);
378 return;
379 }
380 }
382 // These directives indicate jar files which contain only
383 // classes, only non-classfile resources, or a combination of
384 // the two. See src/share/classes/sun/misc/MetaIndex.java and
385 // make/tools/MetaIndex/BuildMetaIndex.java in the J2SE
386 // workspace.
387 case '#':
388 case '!':
389 case '@':
390 {
391 // Hand off current packages to current lazy entry (if any)
392 if ((cur_entry != NULL) &&
393 (boot_class_path_packages.length() > 0)) {
394 if (TraceClassLoading && Verbose) {
395 print_meta_index(cur_entry, boot_class_path_packages);
396 }
397 MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
398 boot_class_path_packages.length());
399 cur_entry->set_meta_index(index);
400 }
401 cur_entry = NULL;
402 boot_class_path_packages.clear();
404 // Find lazy entry corresponding to this jar file
405 for (ClassPathEntry* entry = _first_entry; entry != NULL; entry = entry->next()) {
406 if (entry->is_lazy() &&
407 string_starts_with(entry->name(), meta_index_dir) &&
408 string_ends_with(entry->name(), &package_name[2])) {
409 cur_entry = (LazyClassPathEntry*) entry;
410 break;
411 }
412 }
414 // If the first character is '@', it indicates the following jar
415 // file is a resource only jar file in which case, we should skip
416 // reading the subsequent entries since the resource loading is
417 // totally handled by J2SE side.
418 if (package_name[0] == '@') {
419 if (cur_entry != NULL) {
420 cur_entry->set_meta_index(new MetaIndex(NULL, 0));
421 }
422 cur_entry = NULL;
423 skipCurrentJar = true;
424 } else {
425 skipCurrentJar = false;
426 }
428 break;
429 }
431 default:
432 {
433 if (!skipCurrentJar && cur_entry != NULL) {
434 char* new_name = strdup(package_name);
435 boot_class_path_packages.append(new_name);
436 }
437 }
438 }
439 }
440 // Hand off current packages to current lazy entry (if any)
441 if ((cur_entry != NULL) &&
442 (boot_class_path_packages.length() > 0)) {
443 if (TraceClassLoading && Verbose) {
444 print_meta_index(cur_entry, boot_class_path_packages);
445 }
446 MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
447 boot_class_path_packages.length());
448 cur_entry->set_meta_index(index);
449 }
450 fclose(file);
451 }
452 }
454 void ClassLoader::setup_bootstrap_search_path() {
455 assert(_first_entry == NULL, "should not setup bootstrap class search path twice");
456 char* sys_class_path = os::strdup(Arguments::get_sysclasspath());
457 if (TraceClassLoading && Verbose) {
458 tty->print_cr("[Bootstrap loader class path=%s]", sys_class_path);
459 }
461 int len = (int)strlen(sys_class_path);
462 int end = 0;
464 // Iterate over class path entries
465 for (int start = 0; start < len; start = end) {
466 while (sys_class_path[end] && sys_class_path[end] != os::path_separator()[0]) {
467 end++;
468 }
469 char* path = NEW_C_HEAP_ARRAY(char, end-start+1, mtClass);
470 strncpy(path, &sys_class_path[start], end-start);
471 path[end-start] = '\0';
472 update_class_path_entry_list(path, false);
473 FREE_C_HEAP_ARRAY(char, path, mtClass);
474 while (sys_class_path[end] == os::path_separator()[0]) {
475 end++;
476 }
477 }
478 }
480 ClassPathEntry* ClassLoader::create_class_path_entry(char *path, const struct stat* st, bool lazy, TRAPS) {
481 JavaThread* thread = JavaThread::current();
482 if (lazy) {
483 return new LazyClassPathEntry(path, st);
484 }
485 ClassPathEntry* new_entry = NULL;
486 if ((st->st_mode & S_IFREG) == S_IFREG) {
487 // Regular file, should be a zip file
488 // Canonicalized filename
489 char canonical_path[JVM_MAXPATHLEN];
490 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
491 // This matches the classic VM
492 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
493 }
494 char* error_msg = NULL;
495 jzfile* zip;
496 {
497 // enable call to C land
498 ThreadToNativeFromVM ttn(thread);
499 HandleMark hm(thread);
500 zip = (*ZipOpen)(canonical_path, &error_msg);
501 }
502 if (zip != NULL && error_msg == NULL) {
503 new_entry = new ClassPathZipEntry(zip, path);
504 if (TraceClassLoading) {
505 tty->print_cr("[Opened %s]", path);
506 }
507 } else {
508 ResourceMark rm(thread);
509 char *msg;
510 if (error_msg == NULL) {
511 msg = NEW_RESOURCE_ARRAY(char, strlen(path) + 128); ;
512 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
513 } else {
514 int len = (int)(strlen(path) + strlen(error_msg) + 128);
515 msg = NEW_RESOURCE_ARRAY(char, len); ;
516 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
517 }
518 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
519 }
520 } else {
521 // Directory
522 new_entry = new ClassPathDirEntry(path);
523 if (TraceClassLoading) {
524 tty->print_cr("[Path %s]", path);
525 }
526 }
527 return new_entry;
528 }
531 // Create a class path zip entry for a given path (return NULL if not found
532 // or zip/JAR file cannot be opened)
533 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) {
534 // check for a regular file
535 struct stat st;
536 if (os::stat(path, &st) == 0) {
537 if ((st.st_mode & S_IFREG) == S_IFREG) {
538 char orig_path[JVM_MAXPATHLEN];
539 char canonical_path[JVM_MAXPATHLEN];
541 strcpy(orig_path, path);
542 if (get_canonical_path(orig_path, canonical_path, JVM_MAXPATHLEN)) {
543 char* error_msg = NULL;
544 jzfile* zip;
545 {
546 // enable call to C land
547 JavaThread* thread = JavaThread::current();
548 ThreadToNativeFromVM ttn(thread);
549 HandleMark hm(thread);
550 zip = (*ZipOpen)(canonical_path, &error_msg);
551 }
552 if (zip != NULL && error_msg == NULL) {
553 // create using canonical path
554 return new ClassPathZipEntry(zip, canonical_path);
555 }
556 }
557 }
558 }
559 return NULL;
560 }
562 // returns true if entry already on class path
563 bool ClassLoader::contains_entry(ClassPathEntry *entry) {
564 ClassPathEntry* e = _first_entry;
565 while (e != NULL) {
566 // assume zip entries have been canonicalized
567 if (strcmp(entry->name(), e->name()) == 0) {
568 return true;
569 }
570 e = e->next();
571 }
572 return false;
573 }
575 void ClassLoader::add_to_list(ClassPathEntry *new_entry) {
576 if (new_entry != NULL) {
577 if (_last_entry == NULL) {
578 _first_entry = _last_entry = new_entry;
579 } else {
580 _last_entry->set_next(new_entry);
581 _last_entry = new_entry;
582 }
583 }
584 }
586 void ClassLoader::update_class_path_entry_list(char *path,
587 bool check_for_duplicates) {
588 struct stat st;
589 if (os::stat(path, &st) == 0) {
590 // File or directory found
591 ClassPathEntry* new_entry = NULL;
592 Thread* THREAD = Thread::current();
593 new_entry = create_class_path_entry(path, &st, LazyBootClassLoader, CHECK);
594 // The kernel VM adds dynamically to the end of the classloader path and
595 // doesn't reorder the bootclasspath which would break java.lang.Package
596 // (see PackageInfo).
597 // Add new entry to linked list
598 if (!check_for_duplicates || !contains_entry(new_entry)) {
599 add_to_list(new_entry);
600 }
601 }
602 }
604 void ClassLoader::print_bootclasspath() {
605 ClassPathEntry* e = _first_entry;
606 tty->print("[bootclasspath= ");
607 while (e != NULL) {
608 tty->print("%s ;", e->name());
609 e = e->next();
610 }
611 tty->print_cr("]");
612 }
614 void ClassLoader::load_zip_library() {
615 assert(ZipOpen == NULL, "should not load zip library twice");
616 // First make sure native library is loaded
617 os::native_java_library();
618 // Load zip library
619 char path[JVM_MAXPATHLEN];
620 char ebuf[1024];
621 void* handle = NULL;
622 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
623 handle = os::dll_load(path, ebuf, sizeof ebuf);
624 }
625 if (handle == NULL) {
626 vm_exit_during_initialization("Unable to load ZIP library", path);
627 }
628 // Lookup zip entry points
629 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
630 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
631 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
632 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
633 ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, os::dll_lookup(handle, "ZIP_ReadMappedEntry"));
634 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
636 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
637 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL || GetNextEntry == NULL) {
638 vm_exit_during_initialization("Corrupted ZIP library", path);
639 }
641 // Lookup canonicalize entry in libjava.dll
642 void *javalib_handle = os::native_java_library();
643 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
644 // This lookup only works on 1.3. Do not check for non-null here
645 }
647 // PackageInfo data exists in order to support the java.lang.Package
648 // class. A Package object provides information about a java package
649 // (version, vendor, etc.) which originates in the manifest of the jar
650 // file supplying the package. For application classes, the ClassLoader
651 // object takes care of this.
653 // For system (boot) classes, the Java code in the Package class needs
654 // to be able to identify which source jar file contained the boot
655 // class, so that it can extract the manifest from it. This table
656 // identifies java packages with jar files in the boot classpath.
658 // Because the boot classpath cannot change, the classpath index is
659 // sufficient to identify the source jar file or directory. (Since
660 // directories have no manifests, the directory name is not required,
661 // but is available.)
663 // When using sharing -- the pathnames of entries in the boot classpath
664 // may not be the same at runtime as they were when the archive was
665 // created (NFS, Samba, etc.). The actual files and directories named
666 // in the classpath must be the same files, in the same order, even
667 // though the exact name is not the same.
669 class PackageInfo: public BasicHashtableEntry<mtClass> {
670 public:
671 const char* _pkgname; // Package name
672 int _classpath_index; // Index of directory or JAR file loaded from
674 PackageInfo* next() {
675 return (PackageInfo*)BasicHashtableEntry<mtClass>::next();
676 }
678 const char* pkgname() { return _pkgname; }
679 void set_pkgname(char* pkgname) { _pkgname = pkgname; }
681 const char* filename() {
682 return ClassLoader::classpath_entry(_classpath_index)->name();
683 }
685 void set_index(int index) {
686 _classpath_index = index;
687 }
688 };
691 class PackageHashtable : public BasicHashtable<mtClass> {
692 private:
693 inline unsigned int compute_hash(const char *s, int n) {
694 unsigned int val = 0;
695 while (--n >= 0) {
696 val = *s++ + 31 * val;
697 }
698 return val;
699 }
701 PackageInfo* bucket(int index) {
702 return (PackageInfo*)BasicHashtable<mtClass>::bucket(index);
703 }
705 PackageInfo* get_entry(int index, unsigned int hash,
706 const char* pkgname, size_t n) {
707 for (PackageInfo* pp = bucket(index); pp != NULL; pp = pp->next()) {
708 if (pp->hash() == hash &&
709 strncmp(pkgname, pp->pkgname(), n) == 0 &&
710 pp->pkgname()[n] == '\0') {
711 return pp;
712 }
713 }
714 return NULL;
715 }
717 public:
718 PackageHashtable(int table_size)
719 : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo)) {}
721 PackageHashtable(int table_size, HashtableBucket<mtClass>* t, int number_of_entries)
722 : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo), t, number_of_entries) {}
724 PackageInfo* get_entry(const char* pkgname, int n) {
725 unsigned int hash = compute_hash(pkgname, n);
726 return get_entry(hash_to_index(hash), hash, pkgname, n);
727 }
729 PackageInfo* new_entry(char* pkgname, int n) {
730 unsigned int hash = compute_hash(pkgname, n);
731 PackageInfo* pp;
732 pp = (PackageInfo*)BasicHashtable<mtClass>::new_entry(hash);
733 pp->set_pkgname(pkgname);
734 return pp;
735 }
737 void add_entry(PackageInfo* pp) {
738 int index = hash_to_index(pp->hash());
739 BasicHashtable<mtClass>::add_entry(index, pp);
740 }
742 void copy_pkgnames(const char** packages) {
743 int n = 0;
744 for (int i = 0; i < table_size(); ++i) {
745 for (PackageInfo* pp = bucket(i); pp != NULL; pp = pp->next()) {
746 packages[n++] = pp->pkgname();
747 }
748 }
749 assert(n == number_of_entries(), "just checking");
750 }
752 void copy_table(char** top, char* end, PackageHashtable* table);
753 };
756 void PackageHashtable::copy_table(char** top, char* end,
757 PackageHashtable* table) {
758 // Copy (relocate) the table to the shared space.
759 BasicHashtable<mtClass>::copy_table(top, end);
761 // Calculate the space needed for the package name strings.
762 int i;
763 int n = 0;
764 for (i = 0; i < table_size(); ++i) {
765 for (PackageInfo* pp = table->bucket(i);
766 pp != NULL;
767 pp = pp->next()) {
768 n += (int)(strlen(pp->pkgname()) + 1);
769 }
770 }
771 if (*top + n + sizeof(intptr_t) >= end) {
772 report_out_of_shared_space(SharedMiscData);
773 }
775 // Copy the table data (the strings) to the shared space.
776 n = align_size_up(n, sizeof(HeapWord));
777 *(intptr_t*)(*top) = n;
778 *top += sizeof(intptr_t);
780 for (i = 0; i < table_size(); ++i) {
781 for (PackageInfo* pp = table->bucket(i);
782 pp != NULL;
783 pp = pp->next()) {
784 int n1 = (int)(strlen(pp->pkgname()) + 1);
785 pp->set_pkgname((char*)memcpy(*top, pp->pkgname(), n1));
786 *top += n1;
787 }
788 }
789 *top = (char*)align_size_up((intptr_t)*top, sizeof(HeapWord));
790 }
793 void ClassLoader::copy_package_info_buckets(char** top, char* end) {
794 _package_hash_table->copy_buckets(top, end);
795 }
797 void ClassLoader::copy_package_info_table(char** top, char* end) {
798 _package_hash_table->copy_table(top, end, _package_hash_table);
799 }
802 PackageInfo* ClassLoader::lookup_package(const char *pkgname) {
803 const char *cp = strrchr(pkgname, '/');
804 if (cp != NULL) {
805 // Package prefix found
806 int n = cp - pkgname + 1;
807 return _package_hash_table->get_entry(pkgname, n);
808 }
809 return NULL;
810 }
813 bool ClassLoader::add_package(const char *pkgname, int classpath_index, TRAPS) {
814 assert(pkgname != NULL, "just checking");
815 // Bootstrap loader no longer holds system loader lock obj serializing
816 // load_instance_class and thereby add_package
817 {
818 MutexLocker ml(PackageTable_lock, THREAD);
819 // First check for previously loaded entry
820 PackageInfo* pp = lookup_package(pkgname);
821 if (pp != NULL) {
822 // Existing entry found, check source of package
823 pp->set_index(classpath_index);
824 return true;
825 }
827 const char *cp = strrchr(pkgname, '/');
828 if (cp != NULL) {
829 // Package prefix found
830 int n = cp - pkgname + 1;
832 char* new_pkgname = NEW_C_HEAP_ARRAY(char, n + 1, mtClass);
833 if (new_pkgname == NULL) {
834 return false;
835 }
837 memcpy(new_pkgname, pkgname, n);
838 new_pkgname[n] = '\0';
839 pp = _package_hash_table->new_entry(new_pkgname, n);
840 pp->set_index(classpath_index);
842 // Insert into hash table
843 _package_hash_table->add_entry(pp);
844 }
845 return true;
846 }
847 }
850 oop ClassLoader::get_system_package(const char* name, TRAPS) {
851 PackageInfo* pp;
852 {
853 MutexLocker ml(PackageTable_lock, THREAD);
854 pp = lookup_package(name);
855 }
856 if (pp == NULL) {
857 return NULL;
858 } else {
859 Handle p = java_lang_String::create_from_str(pp->filename(), THREAD);
860 return p();
861 }
862 }
865 objArrayOop ClassLoader::get_system_packages(TRAPS) {
866 ResourceMark rm(THREAD);
867 int nof_entries;
868 const char** packages;
869 {
870 MutexLocker ml(PackageTable_lock, THREAD);
871 // Allocate resource char* array containing package names
872 nof_entries = _package_hash_table->number_of_entries();
873 if ((packages = NEW_RESOURCE_ARRAY(const char*, nof_entries)) == NULL) {
874 return NULL;
875 }
876 _package_hash_table->copy_pkgnames(packages);
877 }
878 // Allocate objArray and fill with java.lang.String
879 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
880 nof_entries, CHECK_0);
881 objArrayHandle result(THREAD, r);
882 for (int i = 0; i < nof_entries; i++) {
883 Handle str = java_lang_String::create_from_str(packages[i], CHECK_0);
884 result->obj_at_put(i, str());
885 }
887 return result();
888 }
891 instanceKlassHandle ClassLoader::load_classfile(Symbol* h_name, TRAPS) {
892 ResourceMark rm(THREAD);
893 EventMark m("loading class %s", h_name->as_C_string());
894 ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion);
896 stringStream st;
897 // st.print() uses too much stack space while handling a StackOverflowError
898 // st.print("%s.class", h_name->as_utf8());
899 st.print_raw(h_name->as_utf8());
900 st.print_raw(".class");
901 char* name = st.as_string();
903 // Lookup stream for parsing .class file
904 ClassFileStream* stream = NULL;
905 int classpath_index = 0;
906 {
907 PerfClassTraceTime vmtimer(perf_sys_class_lookup_time(),
908 ((JavaThread*) THREAD)->get_thread_stat()->perf_timers_addr(),
909 PerfClassTraceTime::CLASS_LOAD);
910 ClassPathEntry* e = _first_entry;
911 while (e != NULL) {
912 stream = e->open_stream(name, CHECK_NULL);
913 if (stream != NULL) {
914 break;
915 }
916 e = e->next();
917 ++classpath_index;
918 }
919 }
921 instanceKlassHandle h;
922 if (stream != NULL) {
924 // class file found, parse it
925 ClassFileParser parser(stream);
926 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
927 Handle protection_domain;
928 TempNewSymbol parsed_name = NULL;
929 instanceKlassHandle result = parser.parseClassFile(h_name,
930 loader_data,
931 protection_domain,
932 parsed_name,
933 false,
934 CHECK_(h));
936 // add to package table
937 if (add_package(name, classpath_index, THREAD)) {
938 h = result;
939 }
940 }
942 return h;
943 }
946 void ClassLoader::create_package_info_table(HashtableBucket<mtClass> *t, int length,
947 int number_of_entries) {
948 assert(_package_hash_table == NULL, "One package info table allowed.");
949 assert(length == package_hash_table_size * sizeof(HashtableBucket<mtClass>),
950 "bad shared package info size.");
951 _package_hash_table = new PackageHashtable(package_hash_table_size, t,
952 number_of_entries);
953 }
956 void ClassLoader::create_package_info_table() {
957 assert(_package_hash_table == NULL, "shouldn't have one yet");
958 _package_hash_table = new PackageHashtable(package_hash_table_size);
959 }
962 // Initialize the class loader's access to methods in libzip. Parse and
963 // process the boot classpath into a list ClassPathEntry objects. Once
964 // this list has been created, it must not change order (see class PackageInfo)
965 // it can be appended to and is by jvmti and the kernel vm.
967 void ClassLoader::initialize() {
968 assert(_package_hash_table == NULL, "should have been initialized by now.");
969 EXCEPTION_MARK;
971 if (UsePerfData) {
972 // jvmstat performance counters
973 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
974 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
975 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
976 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
977 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
978 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
979 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
980 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
981 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
982 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
984 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
985 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
986 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
987 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
988 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
989 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
990 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
991 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
992 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
993 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
994 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
995 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
996 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
999 // The following performance counters are added for measuring the impact
1000 // of the bug fix of 6365597. They are mainly focused on finding out
1001 // the behavior of system & user-defined classloader lock, whether
1002 // ClassLoader.loadClass/findClass is being called synchronized or not.
1003 // Also two additional counters are created to see whether 'UnsyncloadClass'
1004 // flag is being set or not and how many times load_instance_class call
1005 // fails with linkageError etc.
1006 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1007 "systemLoaderLockContentionRate");
1008 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1009 "nonSystemLoaderLockContentionRate");
1010 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1011 "jvmFindLoadedClassNoLockCalls");
1012 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1013 "jvmDefineClassNoLockCalls");
1015 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1016 "jniDefineClassNoLockCalls");
1018 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1019 "unsafeDefineClassCalls");
1021 NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet");
1022 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1023 "loadInstanceClassFailRate");
1025 // increment the isUnsyncloadClass counter if UnsyncloadClass is set.
1026 if (UnsyncloadClass) {
1027 _isUnsyncloadClass->inc();
1028 }
1029 }
1031 // lookup zip library entry points
1032 load_zip_library();
1033 // initialize search path
1034 setup_bootstrap_search_path();
1035 if (LazyBootClassLoader) {
1036 // set up meta index which makes boot classpath initialization lazier
1037 setup_meta_index();
1038 }
1039 }
1042 jlong ClassLoader::classloader_time_ms() {
1043 return UsePerfData ?
1044 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1045 }
1047 jlong ClassLoader::class_init_count() {
1048 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1049 }
1051 jlong ClassLoader::class_init_time_ms() {
1052 return UsePerfData ?
1053 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1054 }
1056 jlong ClassLoader::class_verify_time_ms() {
1057 return UsePerfData ?
1058 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1059 }
1061 jlong ClassLoader::class_link_count() {
1062 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1063 }
1065 jlong ClassLoader::class_link_time_ms() {
1066 return UsePerfData ?
1067 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1068 }
1070 int ClassLoader::compute_Object_vtable() {
1071 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1072 // code to determine actual value from file
1073 // Would be value '11' if finals were in vtable
1074 int JDK_1_2_Object_vtable_size = 5;
1075 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1076 }
1079 void classLoader_init() {
1080 ClassLoader::initialize();
1081 }
1084 bool ClassLoader::get_canonical_path(char* orig, char* out, int len) {
1085 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1086 if (CanonicalizeEntry != NULL) {
1087 JNIEnv* env = JavaThread::current()->jni_environment();
1088 if ((CanonicalizeEntry)(env, os::native_path(orig), out, len) < 0) {
1089 return false;
1090 }
1091 } else {
1092 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1093 strncpy(out, orig, len);
1094 out[len - 1] = '\0';
1095 }
1096 return true;
1097 }
1099 #ifndef PRODUCT
1101 void ClassLoader::verify() {
1102 _package_hash_table->verify();
1103 }
1106 // CompileTheWorld
1107 //
1108 // Iterates over all class path entries and forces compilation of all methods
1109 // in all classes found. Currently, only zip/jar archives are searched.
1110 //
1111 // The classes are loaded by the Java level bootstrap class loader, and the
1112 // initializer is called. If DelayCompilationDuringStartup is true (default),
1113 // the interpreter will run the initialization code. Note that forcing
1114 // initialization in this way could potentially lead to initialization order
1115 // problems, in which case we could just force the initialization bit to be set.
1118 // We need to iterate over the contents of a zip/jar file, so we replicate the
1119 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1120 // since jzfile already has a void* definition.
1121 //
1122 // Note that this is only used in debug mode.
1123 //
1124 // HotSpot integration note:
1125 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1128 // JDK 1.3 version
1129 typedef struct real_jzentry13 { /* Zip file entry */
1130 char *name; /* entry name */
1131 jint time; /* modification time */
1132 jint size; /* size of uncompressed data */
1133 jint csize; /* size of compressed data (zero if uncompressed) */
1134 jint crc; /* crc of uncompressed data */
1135 char *comment; /* optional zip file comment */
1136 jbyte *extra; /* optional extra data */
1137 jint pos; /* position of LOC header (if negative) or data */
1138 } real_jzentry13;
1140 typedef struct real_jzfile13 { /* Zip file */
1141 char *name; /* zip file name */
1142 jint refs; /* number of active references */
1143 jint fd; /* open file descriptor */
1144 void *lock; /* read lock */
1145 char *comment; /* zip file comment */
1146 char *msg; /* zip error message */
1147 void *entries; /* array of hash cells */
1148 jint total; /* total number of entries */
1149 unsigned short *table; /* Hash chain heads: indexes into entries */
1150 jint tablelen; /* number of hash eads */
1151 real_jzfile13 *next; /* next zip file in search list */
1152 jzentry *cache; /* we cache the most recently freed jzentry */
1153 /* Information on metadata names in META-INF directory */
1154 char **metanames; /* array of meta names (may have null names) */
1155 jint metacount; /* number of slots in metanames array */
1156 /* If there are any per-entry comments, they are in the comments array */
1157 char **comments;
1158 } real_jzfile13;
1160 // JDK 1.2 version
1161 typedef struct real_jzentry12 { /* Zip file entry */
1162 char *name; /* entry name */
1163 jint time; /* modification time */
1164 jint size; /* size of uncompressed data */
1165 jint csize; /* size of compressed data (zero if uncompressed) */
1166 jint crc; /* crc of uncompressed data */
1167 char *comment; /* optional zip file comment */
1168 jbyte *extra; /* optional extra data */
1169 jint pos; /* position of LOC header (if negative) or data */
1170 struct real_jzentry12 *next; /* next entry in hash table */
1171 } real_jzentry12;
1173 typedef struct real_jzfile12 { /* Zip file */
1174 char *name; /* zip file name */
1175 jint refs; /* number of active references */
1176 jint fd; /* open file descriptor */
1177 void *lock; /* read lock */
1178 char *comment; /* zip file comment */
1179 char *msg; /* zip error message */
1180 real_jzentry12 *entries; /* array of zip entries */
1181 jint total; /* total number of entries */
1182 real_jzentry12 **table; /* hash table of entries */
1183 jint tablelen; /* number of buckets */
1184 jzfile *next; /* next zip file in search list */
1185 } real_jzfile12;
1188 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1189 // For now we only compile all methods in all classes in zip/jar files
1190 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1191 tty->cr();
1192 }
1195 bool ClassPathDirEntry::is_rt_jar() {
1196 return false;
1197 }
1199 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1200 if (JDK_Version::is_jdk12x_version()) {
1201 compile_the_world12(loader, THREAD);
1202 } else {
1203 compile_the_world13(loader, THREAD);
1204 }
1205 if (HAS_PENDING_EXCEPTION) {
1206 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1207 CLEAR_PENDING_EXCEPTION;
1208 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1209 tty->print_cr("Increase class metadata storage if a limit was set");
1210 } else {
1211 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1212 }
1213 }
1214 }
1216 // Version that works for JDK 1.3.x
1217 void ClassPathZipEntry::compile_the_world13(Handle loader, TRAPS) {
1218 real_jzfile13* zip = (real_jzfile13*) _zip;
1219 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1220 tty->cr();
1221 // Iterate over all entries in zip file
1222 for (int n = 0; ; n++) {
1223 real_jzentry13 * ze = (real_jzentry13 *)((*GetNextEntry)(_zip, n));
1224 if (ze == NULL) break;
1225 ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1226 }
1227 }
1230 // Version that works for JDK 1.2.x
1231 void ClassPathZipEntry::compile_the_world12(Handle loader, TRAPS) {
1232 real_jzfile12* zip = (real_jzfile12*) _zip;
1233 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1234 tty->cr();
1235 // Iterate over all entries in zip file
1236 for (int n = 0; ; n++) {
1237 real_jzentry12 * ze = (real_jzentry12 *)((*GetNextEntry)(_zip, n));
1238 if (ze == NULL) break;
1239 ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1240 }
1241 }
1243 bool ClassPathZipEntry::is_rt_jar() {
1244 if (JDK_Version::is_jdk12x_version()) {
1245 return is_rt_jar12();
1246 } else {
1247 return is_rt_jar13();
1248 }
1249 }
1251 // JDK 1.3 version
1252 bool ClassPathZipEntry::is_rt_jar13() {
1253 real_jzfile13* zip = (real_jzfile13*) _zip;
1254 int len = (int)strlen(zip->name);
1255 // Check whether zip name ends in "rt.jar"
1256 // This will match other archives named rt.jar as well, but this is
1257 // only used for debugging.
1258 return (len >= 6) && (strcasecmp(zip->name + len - 6, "rt.jar") == 0);
1259 }
1261 // JDK 1.2 version
1262 bool ClassPathZipEntry::is_rt_jar12() {
1263 real_jzfile12* zip = (real_jzfile12*) _zip;
1264 int len = (int)strlen(zip->name);
1265 // Check whether zip name ends in "rt.jar"
1266 // This will match other archives named rt.jar as well, but this is
1267 // only used for debugging.
1268 return (len >= 6) && (strcasecmp(zip->name + len - 6, "rt.jar") == 0);
1269 }
1271 void LazyClassPathEntry::compile_the_world(Handle loader, TRAPS) {
1272 ClassPathEntry* cpe = resolve_entry(THREAD);
1273 if (cpe != NULL) {
1274 cpe->compile_the_world(loader, CHECK);
1275 }
1276 }
1278 bool LazyClassPathEntry::is_rt_jar() {
1279 Thread* THREAD = Thread::current();
1280 ClassPathEntry* cpe = resolve_entry(THREAD);
1281 return (cpe != NULL) ? cpe->is_jar_file() : false;
1282 }
1284 void ClassLoader::compile_the_world() {
1285 EXCEPTION_MARK;
1286 HandleMark hm(THREAD);
1287 ResourceMark rm(THREAD);
1288 // Make sure we don't run with background compilation
1289 BackgroundCompilation = false;
1290 // Find bootstrap loader
1291 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1292 // Iterate over all bootstrap class path entries
1293 ClassPathEntry* e = _first_entry;
1294 jlong start = os::javaTimeMillis();
1295 while (e != NULL) {
1296 // We stop at rt.jar, unless it is the first bootstrap path entry
1297 if (e->is_rt_jar() && e != _first_entry) break;
1298 e->compile_the_world(system_class_loader, CATCH);
1299 e = e->next();
1300 }
1301 jlong end = os::javaTimeMillis();
1302 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1303 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1304 {
1305 // Print statistics as if before normal exit:
1306 extern void print_statistics();
1307 print_statistics();
1308 }
1309 vm_exit(0);
1310 }
1312 int ClassLoader::_compile_the_world_class_counter = 0;
1313 int ClassLoader::_compile_the_world_method_counter = 0;
1314 static int _codecache_sweep_counter = 0;
1316 // Filter out all exceptions except OOMs
1317 static void clear_pending_exception_if_not_oom(TRAPS) {
1318 if (HAS_PENDING_EXCEPTION &&
1319 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1320 CLEAR_PENDING_EXCEPTION;
1321 }
1322 // The CHECK at the caller will propagate the exception out
1323 }
1325 /**
1326 * Returns if the given method should be compiled when doing compile-the-world.
1327 *
1328 * TODO: This should be a private method in a CompileTheWorld class.
1329 */
1330 static bool can_be_compiled(methodHandle m, int comp_level) {
1331 assert(CompileTheWorld, "must be");
1333 // It's not valid to compile a native wrapper for MethodHandle methods
1334 // that take a MemberName appendix since the bytecode signature is not
1335 // correct.
1336 vmIntrinsics::ID iid = m->intrinsic_id();
1337 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1338 return false;
1339 }
1341 return CompilationPolicy::can_be_compiled(m, comp_level);
1342 }
1344 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1345 int len = (int)strlen(name);
1346 if (len > 6 && strcmp(".class", name + len - 6) == 0) {
1347 // We have a .class file
1348 char buffer[2048];
1349 strncpy(buffer, name, len - 6);
1350 buffer[len-6] = 0;
1351 // If the file has a period after removing .class, it's not really a
1352 // valid class file. The class loader will check everything else.
1353 if (strchr(buffer, '.') == NULL) {
1354 _compile_the_world_class_counter++;
1355 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
1357 // Construct name without extension
1358 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
1359 // Use loader to load and initialize class
1360 Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
1361 instanceKlassHandle k (THREAD, ik);
1362 if (k.not_null() && !HAS_PENDING_EXCEPTION) {
1363 k->initialize(THREAD);
1364 }
1365 bool exception_occurred = HAS_PENDING_EXCEPTION;
1366 clear_pending_exception_if_not_oom(CHECK);
1367 if (CompileTheWorldPreloadClasses && k.not_null()) {
1368 ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD);
1369 if (HAS_PENDING_EXCEPTION) {
1370 // If something went wrong in preloading we just ignore it
1371 clear_pending_exception_if_not_oom(CHECK);
1372 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
1373 }
1374 }
1376 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
1377 if (k.is_null() || exception_occurred) {
1378 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
1379 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
1380 } else {
1381 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
1382 // Preload all classes to get around uncommon traps
1383 // Iterate over all methods in class
1384 int comp_level = CompilationPolicy::policy()->initial_compile_level();
1385 for (int n = 0; n < k->methods()->length(); n++) {
1386 methodHandle m (THREAD, k->methods()->at(n));
1387 if (can_be_compiled(m, comp_level)) {
1388 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
1389 // Give sweeper a chance to keep up with CTW
1390 VM_ForceSafepoint op;
1391 VMThread::execute(&op);
1392 _codecache_sweep_counter = 0;
1393 }
1394 // Force compilation
1395 CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
1396 methodHandle(), 0, "CTW", THREAD);
1397 if (HAS_PENDING_EXCEPTION) {
1398 clear_pending_exception_if_not_oom(CHECK);
1399 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1400 } else {
1401 _compile_the_world_method_counter++;
1402 }
1403 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
1404 // Clobber the first compile and force second tier compilation
1405 nmethod* nm = m->code();
1406 if (nm != NULL) {
1407 // Throw out the code so that the code cache doesn't fill up
1408 nm->make_not_entrant();
1409 m->clear_code();
1410 }
1411 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
1412 methodHandle(), 0, "CTW", THREAD);
1413 if (HAS_PENDING_EXCEPTION) {
1414 clear_pending_exception_if_not_oom(CHECK);
1415 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1416 } else {
1417 _compile_the_world_method_counter++;
1418 }
1419 }
1420 } else {
1421 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1422 }
1424 nmethod* nm = m->code();
1425 if (nm != NULL) {
1426 // Throw out the code so that the code cache doesn't fill up
1427 nm->make_not_entrant();
1428 m->clear_code();
1429 }
1430 }
1431 }
1432 }
1433 }
1434 }
1435 }
1437 #endif //PRODUCT
1439 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1440 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1441 void PerfClassTraceTime::initialize() {
1442 if (!UsePerfData) return;
1444 if (_eventp != NULL) {
1445 // increment the event counter
1446 _eventp->inc();
1447 }
1449 // stop the current active thread-local timer to measure inclusive time
1450 _prev_active_event = -1;
1451 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1452 if (_timers[i].is_active()) {
1453 assert(_prev_active_event == -1, "should have only one active timer");
1454 _prev_active_event = i;
1455 _timers[i].stop();
1456 }
1457 }
1459 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1460 // start the inclusive timer if not recursively called
1461 _t.start();
1462 }
1464 // start thread-local timer of the given event type
1465 if (!_timers[_event_type].is_active()) {
1466 _timers[_event_type].start();
1467 }
1468 }
1470 PerfClassTraceTime::~PerfClassTraceTime() {
1471 if (!UsePerfData) return;
1473 // stop the thread-local timer as the event completes
1474 // and resume the thread-local timer of the event next on the stack
1475 _timers[_event_type].stop();
1476 jlong selftime = _timers[_event_type].ticks();
1478 if (_prev_active_event >= 0) {
1479 _timers[_prev_active_event].start();
1480 }
1482 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1484 // increment the counters only on the leaf call
1485 _t.stop();
1486 _timep->inc(_t.ticks());
1487 if (_selftimep != NULL) {
1488 _selftimep->inc(selftime);
1489 }
1490 // add all class loading related event selftime to the accumulated time counter
1491 ClassLoader::perf_accumulated_time()->inc(selftime);
1493 // reset the timer
1494 _timers[_event_type].reset();
1495 }
