Mon, 20 Jan 2014 11:47:07 +0100
8027476: Improve performance of Stringtable unlink
8027455: Improve symbol table scan times during gc pauses
Summary: Parallelize string table and symbol table scan during remark and full GC. Some additional statistics output if the experimental flag G1TraceStringSymbolTableScrubbing is set.
Reviewed-by: mgerdin, coleenp, brutisso
1 /*
2 * Copyright (c) 1997, 2013, 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_bsd
72 # include "os_bsd.inline.hpp"
73 #endif
76 // Entry points in zip.dll for loading zip/jar file entries
78 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg);
79 typedef void (JNICALL *ZipClose_t)(jzfile *zip);
80 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
81 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
82 typedef jboolean (JNICALL *ReadMappedEntry_t)(jzfile *zip, jzentry *entry, unsigned char **buf, char *namebuf);
83 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n);
85 static ZipOpen_t ZipOpen = NULL;
86 static ZipClose_t ZipClose = NULL;
87 static FindEntry_t FindEntry = NULL;
88 static ReadEntry_t ReadEntry = NULL;
89 static ReadMappedEntry_t ReadMappedEntry = NULL;
90 static GetNextEntry_t GetNextEntry = NULL;
91 static canonicalize_fn_t CanonicalizeEntry = NULL;
93 // Globals
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;
127 ClassPathEntry* ClassLoader::_first_entry = NULL;
128 ClassPathEntry* ClassLoader::_last_entry = NULL;
129 PackageHashtable* ClassLoader::_package_hash_table = NULL;
131 // helper routines
132 bool string_starts_with(const char* str, const char* str_to_find) {
133 size_t str_len = strlen(str);
134 size_t str_to_find_len = strlen(str_to_find);
135 if (str_to_find_len > str_len) {
136 return false;
137 }
138 return (strncmp(str, str_to_find, str_to_find_len) == 0);
139 }
141 bool string_ends_with(const char* str, const char* str_to_find) {
142 size_t str_len = strlen(str);
143 size_t str_to_find_len = strlen(str_to_find);
144 if (str_to_find_len > str_len) {
145 return false;
146 }
147 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
148 }
151 MetaIndex::MetaIndex(char** meta_package_names, int num_meta_package_names) {
152 if (num_meta_package_names == 0) {
153 _meta_package_names = NULL;
154 _num_meta_package_names = 0;
155 } else {
156 _meta_package_names = NEW_C_HEAP_ARRAY(char*, num_meta_package_names, mtClass);
157 _num_meta_package_names = num_meta_package_names;
158 memcpy(_meta_package_names, meta_package_names, num_meta_package_names * sizeof(char*));
159 }
160 }
163 MetaIndex::~MetaIndex() {
164 FREE_C_HEAP_ARRAY(char*, _meta_package_names, mtClass);
165 }
168 bool MetaIndex::may_contain(const char* class_name) {
169 if ( _num_meta_package_names == 0) {
170 return false;
171 }
172 size_t class_name_len = strlen(class_name);
173 for (int i = 0; i < _num_meta_package_names; i++) {
174 char* pkg = _meta_package_names[i];
175 size_t pkg_len = strlen(pkg);
176 size_t min_len = MIN2(class_name_len, pkg_len);
177 if (!strncmp(class_name, pkg, min_len)) {
178 return true;
179 }
180 }
181 return false;
182 }
185 ClassPathEntry::ClassPathEntry() {
186 set_next(NULL);
187 }
190 bool ClassPathEntry::is_lazy() {
191 return false;
192 }
194 ClassPathDirEntry::ClassPathDirEntry(char* dir) : ClassPathEntry() {
195 _dir = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
196 strcpy(_dir, dir);
197 }
200 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
201 // construct full path name
202 char path[JVM_MAXPATHLEN];
203 if (jio_snprintf(path, sizeof(path), "%s%s%s", _dir, os::file_separator(), name) == -1) {
204 return NULL;
205 }
206 // check if file exists
207 struct stat st;
208 if (os::stat(path, &st) == 0) {
209 // found file, open it
210 int file_handle = os::open(path, 0, 0);
211 if (file_handle != -1) {
212 // read contents into resource array
213 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
214 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
215 // close file
216 os::close(file_handle);
217 // construct ClassFileStream
218 if (num_read == (size_t)st.st_size) {
219 if (UsePerfData) {
220 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
221 }
222 return new ClassFileStream(buffer, st.st_size, _dir); // Resource allocated
223 }
224 }
225 }
226 return NULL;
227 }
230 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name) : ClassPathEntry() {
231 _zip = zip;
232 _zip_name = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
233 strcpy(_zip_name, zip_name);
234 }
236 ClassPathZipEntry::~ClassPathZipEntry() {
237 if (ZipClose != NULL) {
238 (*ZipClose)(_zip);
239 }
240 FREE_C_HEAP_ARRAY(char, _zip_name, mtClass);
241 }
243 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
244 // enable call to C land
245 JavaThread* thread = JavaThread::current();
246 ThreadToNativeFromVM ttn(thread);
247 // check whether zip archive contains name
248 jint filesize, name_len;
249 jzentry* entry = (*FindEntry)(_zip, name, &filesize, &name_len);
250 if (entry == NULL) return NULL;
251 u1* buffer;
252 char name_buf[128];
253 char* filename;
254 if (name_len < 128) {
255 filename = name_buf;
256 } else {
257 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
258 }
260 // file found, get pointer to class in mmaped jar file.
261 if (ReadMappedEntry == NULL ||
262 !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) {
263 // mmaped access not available, perhaps due to compression,
264 // read contents into resource array
265 buffer = NEW_RESOURCE_ARRAY(u1, filesize);
266 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
267 }
268 if (UsePerfData) {
269 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
270 }
271 // return result
272 return new ClassFileStream(buffer, filesize, _zip_name); // Resource allocated
273 }
275 // invoke function for each entry in the zip file
276 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
277 JavaThread* thread = JavaThread::current();
278 HandleMark handle_mark(thread);
279 ThreadToNativeFromVM ttn(thread);
280 for (int n = 0; ; n++) {
281 jzentry * ze = ((*GetNextEntry)(_zip, n));
282 if (ze == NULL) break;
283 (*f)(ze->name, context);
284 }
285 }
287 LazyClassPathEntry::LazyClassPathEntry(char* path, const struct stat* st) : ClassPathEntry() {
288 _path = strdup(path);
289 _st = *st;
290 _meta_index = NULL;
291 _resolved_entry = NULL;
292 _has_error = false;
293 }
295 bool LazyClassPathEntry::is_jar_file() {
296 return ((_st.st_mode & S_IFREG) == S_IFREG);
297 }
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, CHECK_NULL);
305 {
306 ThreadCritical tc;
307 if (_resolved_entry == NULL) {
308 _resolved_entry = new_entry;
309 return new_entry;
310 }
311 }
312 assert(_resolved_entry != NULL, "bug in MT-safe resolution logic");
313 delete new_entry;
314 return (ClassPathEntry*) _resolved_entry;
315 }
317 ClassFileStream* LazyClassPathEntry::open_stream(const char* name, TRAPS) {
318 if (_meta_index != NULL &&
319 !_meta_index->may_contain(name)) {
320 return NULL;
321 }
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 }
334 bool LazyClassPathEntry::is_lazy() {
335 return true;
336 }
338 static void print_meta_index(LazyClassPathEntry* entry,
339 GrowableArray<char*>& meta_packages) {
340 tty->print("[Meta index for %s=", entry->name());
341 for (int i = 0; i < meta_packages.length(); i++) {
342 if (i > 0) tty->print(" ");
343 tty->print(meta_packages.at(i));
344 }
345 tty->print_cr("]");
346 }
349 void ClassLoader::setup_meta_index() {
350 // Set up meta index which allows us to open boot jars lazily if
351 // class data sharing is enabled
352 const char* known_version = "% VERSION 2";
353 char* meta_index_path = Arguments::get_meta_index_path();
354 char* meta_index_dir = Arguments::get_meta_index_dir();
355 FILE* file = fopen(meta_index_path, "r");
356 int line_no = 0;
357 if (file != NULL) {
358 ResourceMark rm;
359 LazyClassPathEntry* cur_entry = NULL;
360 GrowableArray<char*> boot_class_path_packages(10);
361 char package_name[256];
362 bool skipCurrentJar = false;
363 while (fgets(package_name, sizeof(package_name), file) != NULL) {
364 ++line_no;
365 // Remove trailing newline
366 package_name[strlen(package_name) - 1] = '\0';
367 switch(package_name[0]) {
368 case '%':
369 {
370 if ((line_no == 1) && (strcmp(package_name, known_version) != 0)) {
371 if (TraceClassLoading && Verbose) {
372 tty->print("[Unsupported meta index version]");
373 }
374 fclose(file);
375 return;
376 }
377 }
379 // These directives indicate jar files which contain only
380 // classes, only non-classfile resources, or a combination of
381 // the two. See src/share/classes/sun/misc/MetaIndex.java and
382 // make/tools/MetaIndex/BuildMetaIndex.java in the J2SE
383 // workspace.
384 case '#':
385 case '!':
386 case '@':
387 {
388 // Hand off current packages to current lazy entry (if any)
389 if ((cur_entry != NULL) &&
390 (boot_class_path_packages.length() > 0)) {
391 if (TraceClassLoading && Verbose) {
392 print_meta_index(cur_entry, boot_class_path_packages);
393 }
394 MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
395 boot_class_path_packages.length());
396 cur_entry->set_meta_index(index);
397 }
398 cur_entry = NULL;
399 boot_class_path_packages.clear();
401 // Find lazy entry corresponding to this jar file
402 for (ClassPathEntry* entry = _first_entry; entry != NULL; entry = entry->next()) {
403 if (entry->is_lazy() &&
404 string_starts_with(entry->name(), meta_index_dir) &&
405 string_ends_with(entry->name(), &package_name[2])) {
406 cur_entry = (LazyClassPathEntry*) entry;
407 break;
408 }
409 }
411 // If the first character is '@', it indicates the following jar
412 // file is a resource only jar file in which case, we should skip
413 // reading the subsequent entries since the resource loading is
414 // totally handled by J2SE side.
415 if (package_name[0] == '@') {
416 if (cur_entry != NULL) {
417 cur_entry->set_meta_index(new MetaIndex(NULL, 0));
418 }
419 cur_entry = NULL;
420 skipCurrentJar = true;
421 } else {
422 skipCurrentJar = false;
423 }
425 break;
426 }
428 default:
429 {
430 if (!skipCurrentJar && cur_entry != NULL) {
431 char* new_name = strdup(package_name);
432 boot_class_path_packages.append(new_name);
433 }
434 }
435 }
436 }
437 // Hand off current packages to current lazy entry (if any)
438 if ((cur_entry != NULL) &&
439 (boot_class_path_packages.length() > 0)) {
440 if (TraceClassLoading && Verbose) {
441 print_meta_index(cur_entry, boot_class_path_packages);
442 }
443 MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
444 boot_class_path_packages.length());
445 cur_entry->set_meta_index(index);
446 }
447 fclose(file);
448 }
449 }
451 void ClassLoader::setup_bootstrap_search_path() {
452 assert(_first_entry == NULL, "should not setup bootstrap class search path twice");
453 char* sys_class_path = os::strdup(Arguments::get_sysclasspath());
454 if (TraceClassLoading && Verbose) {
455 tty->print_cr("[Bootstrap loader class path=%s]", sys_class_path);
456 }
458 int len = (int)strlen(sys_class_path);
459 int end = 0;
461 // Iterate over class path entries
462 for (int start = 0; start < len; start = end) {
463 while (sys_class_path[end] && sys_class_path[end] != os::path_separator()[0]) {
464 end++;
465 }
466 char* path = NEW_C_HEAP_ARRAY(char, end-start+1, mtClass);
467 strncpy(path, &sys_class_path[start], end-start);
468 path[end-start] = '\0';
469 update_class_path_entry_list(path, false);
470 FREE_C_HEAP_ARRAY(char, path, mtClass);
471 while (sys_class_path[end] == os::path_separator()[0]) {
472 end++;
473 }
474 }
475 }
477 ClassPathEntry* ClassLoader::create_class_path_entry(char *path, const struct stat* st, bool lazy, TRAPS) {
478 JavaThread* thread = JavaThread::current();
479 if (lazy) {
480 return new LazyClassPathEntry(path, st);
481 }
482 ClassPathEntry* new_entry = NULL;
483 if ((st->st_mode & S_IFREG) == S_IFREG) {
484 // Regular file, should be a zip file
485 // Canonicalized filename
486 char canonical_path[JVM_MAXPATHLEN];
487 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
488 // This matches the classic VM
489 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
490 }
491 char* error_msg = NULL;
492 jzfile* zip;
493 {
494 // enable call to C land
495 ThreadToNativeFromVM ttn(thread);
496 HandleMark hm(thread);
497 zip = (*ZipOpen)(canonical_path, &error_msg);
498 }
499 if (zip != NULL && error_msg == NULL) {
500 new_entry = new ClassPathZipEntry(zip, path);
501 if (TraceClassLoading) {
502 tty->print_cr("[Opened %s]", path);
503 }
504 } else {
505 ResourceMark rm(thread);
506 char *msg;
507 if (error_msg == NULL) {
508 msg = NEW_RESOURCE_ARRAY(char, strlen(path) + 128); ;
509 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
510 } else {
511 int len = (int)(strlen(path) + strlen(error_msg) + 128);
512 msg = NEW_RESOURCE_ARRAY(char, len); ;
513 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
514 }
515 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
516 }
517 } else {
518 // Directory
519 new_entry = new ClassPathDirEntry(path);
520 if (TraceClassLoading) {
521 tty->print_cr("[Path %s]", path);
522 }
523 }
524 return new_entry;
525 }
528 // Create a class path zip entry for a given path (return NULL if not found
529 // or zip/JAR file cannot be opened)
530 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) {
531 // check for a regular file
532 struct stat st;
533 if (os::stat(path, &st) == 0) {
534 if ((st.st_mode & S_IFREG) == S_IFREG) {
535 char orig_path[JVM_MAXPATHLEN];
536 char canonical_path[JVM_MAXPATHLEN];
538 strcpy(orig_path, path);
539 if (get_canonical_path(orig_path, canonical_path, JVM_MAXPATHLEN)) {
540 char* error_msg = NULL;
541 jzfile* zip;
542 {
543 // enable call to C land
544 JavaThread* thread = JavaThread::current();
545 ThreadToNativeFromVM ttn(thread);
546 HandleMark hm(thread);
547 zip = (*ZipOpen)(canonical_path, &error_msg);
548 }
549 if (zip != NULL && error_msg == NULL) {
550 // create using canonical path
551 return new ClassPathZipEntry(zip, canonical_path);
552 }
553 }
554 }
555 }
556 return NULL;
557 }
559 // returns true if entry already on class path
560 bool ClassLoader::contains_entry(ClassPathEntry *entry) {
561 ClassPathEntry* e = _first_entry;
562 while (e != NULL) {
563 // assume zip entries have been canonicalized
564 if (strcmp(entry->name(), e->name()) == 0) {
565 return true;
566 }
567 e = e->next();
568 }
569 return false;
570 }
572 void ClassLoader::add_to_list(ClassPathEntry *new_entry) {
573 if (new_entry != NULL) {
574 if (_last_entry == NULL) {
575 _first_entry = _last_entry = new_entry;
576 } else {
577 _last_entry->set_next(new_entry);
578 _last_entry = new_entry;
579 }
580 }
581 }
583 void ClassLoader::update_class_path_entry_list(char *path,
584 bool check_for_duplicates) {
585 struct stat st;
586 if (os::stat(path, &st) == 0) {
587 // File or directory found
588 ClassPathEntry* new_entry = NULL;
589 Thread* THREAD = Thread::current();
590 new_entry = create_class_path_entry(path, &st, LazyBootClassLoader, CHECK);
591 // The kernel VM adds dynamically to the end of the classloader path and
592 // doesn't reorder the bootclasspath which would break java.lang.Package
593 // (see PackageInfo).
594 // Add new entry to linked list
595 if (!check_for_duplicates || !contains_entry(new_entry)) {
596 add_to_list(new_entry);
597 }
598 }
599 }
601 void ClassLoader::print_bootclasspath() {
602 ClassPathEntry* e = _first_entry;
603 tty->print("[bootclasspath= ");
604 while (e != NULL) {
605 tty->print("%s ;", e->name());
606 e = e->next();
607 }
608 tty->print_cr("]");
609 }
611 void ClassLoader::load_zip_library() {
612 assert(ZipOpen == NULL, "should not load zip library twice");
613 // First make sure native library is loaded
614 os::native_java_library();
615 // Load zip library
616 char path[JVM_MAXPATHLEN];
617 char ebuf[1024];
618 void* handle = NULL;
619 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
620 handle = os::dll_load(path, ebuf, sizeof ebuf);
621 }
622 if (handle == NULL) {
623 vm_exit_during_initialization("Unable to load ZIP library", path);
624 }
625 // Lookup zip entry points
626 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
627 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
628 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
629 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
630 ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, os::dll_lookup(handle, "ZIP_ReadMappedEntry"));
631 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
633 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
634 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL || GetNextEntry == NULL) {
635 vm_exit_during_initialization("Corrupted ZIP library", path);
636 }
638 // Lookup canonicalize entry in libjava.dll
639 void *javalib_handle = os::native_java_library();
640 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
641 // This lookup only works on 1.3. Do not check for non-null here
642 }
644 // PackageInfo data exists in order to support the java.lang.Package
645 // class. A Package object provides information about a java package
646 // (version, vendor, etc.) which originates in the manifest of the jar
647 // file supplying the package. For application classes, the ClassLoader
648 // object takes care of this.
650 // For system (boot) classes, the Java code in the Package class needs
651 // to be able to identify which source jar file contained the boot
652 // class, so that it can extract the manifest from it. This table
653 // identifies java packages with jar files in the boot classpath.
655 // Because the boot classpath cannot change, the classpath index is
656 // sufficient to identify the source jar file or directory. (Since
657 // directories have no manifests, the directory name is not required,
658 // but is available.)
660 // When using sharing -- the pathnames of entries in the boot classpath
661 // may not be the same at runtime as they were when the archive was
662 // created (NFS, Samba, etc.). The actual files and directories named
663 // in the classpath must be the same files, in the same order, even
664 // though the exact name is not the same.
666 class PackageInfo: public BasicHashtableEntry<mtClass> {
667 public:
668 const char* _pkgname; // Package name
669 int _classpath_index; // Index of directory or JAR file loaded from
671 PackageInfo* next() {
672 return (PackageInfo*)BasicHashtableEntry<mtClass>::next();
673 }
675 const char* pkgname() { return _pkgname; }
676 void set_pkgname(char* pkgname) { _pkgname = pkgname; }
678 const char* filename() {
679 return ClassLoader::classpath_entry(_classpath_index)->name();
680 }
682 void set_index(int index) {
683 _classpath_index = index;
684 }
685 };
688 class PackageHashtable : public BasicHashtable<mtClass> {
689 private:
690 inline unsigned int compute_hash(const char *s, int n) {
691 unsigned int val = 0;
692 while (--n >= 0) {
693 val = *s++ + 31 * val;
694 }
695 return val;
696 }
698 PackageInfo* bucket(int index) {
699 return (PackageInfo*)BasicHashtable<mtClass>::bucket(index);
700 }
702 PackageInfo* get_entry(int index, unsigned int hash,
703 const char* pkgname, size_t n) {
704 for (PackageInfo* pp = bucket(index); pp != NULL; pp = pp->next()) {
705 if (pp->hash() == hash &&
706 strncmp(pkgname, pp->pkgname(), n) == 0 &&
707 pp->pkgname()[n] == '\0') {
708 return pp;
709 }
710 }
711 return NULL;
712 }
714 public:
715 PackageHashtable(int table_size)
716 : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo)) {}
718 PackageHashtable(int table_size, HashtableBucket<mtClass>* t, int number_of_entries)
719 : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo), t, number_of_entries) {}
721 PackageInfo* get_entry(const char* pkgname, int n) {
722 unsigned int hash = compute_hash(pkgname, n);
723 return get_entry(hash_to_index(hash), hash, pkgname, n);
724 }
726 PackageInfo* new_entry(char* pkgname, int n) {
727 unsigned int hash = compute_hash(pkgname, n);
728 PackageInfo* pp;
729 pp = (PackageInfo*)BasicHashtable<mtClass>::new_entry(hash);
730 pp->set_pkgname(pkgname);
731 return pp;
732 }
734 void add_entry(PackageInfo* pp) {
735 int index = hash_to_index(pp->hash());
736 BasicHashtable<mtClass>::add_entry(index, pp);
737 }
739 void copy_pkgnames(const char** packages) {
740 int n = 0;
741 for (int i = 0; i < table_size(); ++i) {
742 for (PackageInfo* pp = bucket(i); pp != NULL; pp = pp->next()) {
743 packages[n++] = pp->pkgname();
744 }
745 }
746 assert(n == number_of_entries(), "just checking");
747 }
749 void copy_table(char** top, char* end, PackageHashtable* table);
750 };
753 void PackageHashtable::copy_table(char** top, char* end,
754 PackageHashtable* table) {
755 // Copy (relocate) the table to the shared space.
756 BasicHashtable<mtClass>::copy_table(top, end);
758 // Calculate the space needed for the package name strings.
759 int i;
760 int n = 0;
761 for (i = 0; i < table_size(); ++i) {
762 for (PackageInfo* pp = table->bucket(i);
763 pp != NULL;
764 pp = pp->next()) {
765 n += (int)(strlen(pp->pkgname()) + 1);
766 }
767 }
768 if (*top + n + sizeof(intptr_t) >= end) {
769 report_out_of_shared_space(SharedMiscData);
770 }
772 // Copy the table data (the strings) to the shared space.
773 n = align_size_up(n, sizeof(HeapWord));
774 *(intptr_t*)(*top) = n;
775 *top += sizeof(intptr_t);
777 for (i = 0; i < table_size(); ++i) {
778 for (PackageInfo* pp = table->bucket(i);
779 pp != NULL;
780 pp = pp->next()) {
781 int n1 = (int)(strlen(pp->pkgname()) + 1);
782 pp->set_pkgname((char*)memcpy(*top, pp->pkgname(), n1));
783 *top += n1;
784 }
785 }
786 *top = (char*)align_size_up((intptr_t)*top, sizeof(HeapWord));
787 }
790 void ClassLoader::copy_package_info_buckets(char** top, char* end) {
791 _package_hash_table->copy_buckets(top, end);
792 }
794 void ClassLoader::copy_package_info_table(char** top, char* end) {
795 _package_hash_table->copy_table(top, end, _package_hash_table);
796 }
799 PackageInfo* ClassLoader::lookup_package(const char *pkgname) {
800 const char *cp = strrchr(pkgname, '/');
801 if (cp != NULL) {
802 // Package prefix found
803 int n = cp - pkgname + 1;
804 return _package_hash_table->get_entry(pkgname, n);
805 }
806 return NULL;
807 }
810 bool ClassLoader::add_package(const char *pkgname, int classpath_index, TRAPS) {
811 assert(pkgname != NULL, "just checking");
812 // Bootstrap loader no longer holds system loader lock obj serializing
813 // load_instance_class and thereby add_package
814 {
815 MutexLocker ml(PackageTable_lock, THREAD);
816 // First check for previously loaded entry
817 PackageInfo* pp = lookup_package(pkgname);
818 if (pp != NULL) {
819 // Existing entry found, check source of package
820 pp->set_index(classpath_index);
821 return true;
822 }
824 const char *cp = strrchr(pkgname, '/');
825 if (cp != NULL) {
826 // Package prefix found
827 int n = cp - pkgname + 1;
829 char* new_pkgname = NEW_C_HEAP_ARRAY(char, n + 1, mtClass);
830 if (new_pkgname == NULL) {
831 return false;
832 }
834 memcpy(new_pkgname, pkgname, n);
835 new_pkgname[n] = '\0';
836 pp = _package_hash_table->new_entry(new_pkgname, n);
837 pp->set_index(classpath_index);
839 // Insert into hash table
840 _package_hash_table->add_entry(pp);
841 }
842 return true;
843 }
844 }
847 oop ClassLoader::get_system_package(const char* name, TRAPS) {
848 PackageInfo* pp;
849 {
850 MutexLocker ml(PackageTable_lock, THREAD);
851 pp = lookup_package(name);
852 }
853 if (pp == NULL) {
854 return NULL;
855 } else {
856 Handle p = java_lang_String::create_from_str(pp->filename(), THREAD);
857 return p();
858 }
859 }
862 objArrayOop ClassLoader::get_system_packages(TRAPS) {
863 ResourceMark rm(THREAD);
864 int nof_entries;
865 const char** packages;
866 {
867 MutexLocker ml(PackageTable_lock, THREAD);
868 // Allocate resource char* array containing package names
869 nof_entries = _package_hash_table->number_of_entries();
870 if ((packages = NEW_RESOURCE_ARRAY(const char*, nof_entries)) == NULL) {
871 return NULL;
872 }
873 _package_hash_table->copy_pkgnames(packages);
874 }
875 // Allocate objArray and fill with java.lang.String
876 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
877 nof_entries, CHECK_0);
878 objArrayHandle result(THREAD, r);
879 for (int i = 0; i < nof_entries; i++) {
880 Handle str = java_lang_String::create_from_str(packages[i], CHECK_0);
881 result->obj_at_put(i, str());
882 }
884 return result();
885 }
888 instanceKlassHandle ClassLoader::load_classfile(Symbol* h_name, TRAPS) {
889 ResourceMark rm(THREAD);
890 EventMark m("loading class %s", h_name->as_C_string());
891 ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion);
893 stringStream st;
894 // st.print() uses too much stack space while handling a StackOverflowError
895 // st.print("%s.class", h_name->as_utf8());
896 st.print_raw(h_name->as_utf8());
897 st.print_raw(".class");
898 char* name = st.as_string();
900 // Lookup stream for parsing .class file
901 ClassFileStream* stream = NULL;
902 int classpath_index = 0;
903 {
904 PerfClassTraceTime vmtimer(perf_sys_class_lookup_time(),
905 ((JavaThread*) THREAD)->get_thread_stat()->perf_timers_addr(),
906 PerfClassTraceTime::CLASS_LOAD);
907 ClassPathEntry* e = _first_entry;
908 while (e != NULL) {
909 stream = e->open_stream(name, CHECK_NULL);
910 if (stream != NULL) {
911 break;
912 }
913 e = e->next();
914 ++classpath_index;
915 }
916 }
918 instanceKlassHandle h;
919 if (stream != NULL) {
921 // class file found, parse it
922 ClassFileParser parser(stream);
923 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
924 Handle protection_domain;
925 TempNewSymbol parsed_name = NULL;
926 instanceKlassHandle result = parser.parseClassFile(h_name,
927 loader_data,
928 protection_domain,
929 parsed_name,
930 false,
931 CHECK_(h));
933 // add to package table
934 if (add_package(name, classpath_index, THREAD)) {
935 h = result;
936 }
937 }
939 return h;
940 }
943 void ClassLoader::create_package_info_table(HashtableBucket<mtClass> *t, int length,
944 int number_of_entries) {
945 assert(_package_hash_table == NULL, "One package info table allowed.");
946 assert(length == package_hash_table_size * sizeof(HashtableBucket<mtClass>),
947 "bad shared package info size.");
948 _package_hash_table = new PackageHashtable(package_hash_table_size, t,
949 number_of_entries);
950 }
953 void ClassLoader::create_package_info_table() {
954 assert(_package_hash_table == NULL, "shouldn't have one yet");
955 _package_hash_table = new PackageHashtable(package_hash_table_size);
956 }
959 // Initialize the class loader's access to methods in libzip. Parse and
960 // process the boot classpath into a list ClassPathEntry objects. Once
961 // this list has been created, it must not change order (see class PackageInfo)
962 // it can be appended to and is by jvmti and the kernel vm.
964 void ClassLoader::initialize() {
965 assert(_package_hash_table == NULL, "should have been initialized by now.");
966 EXCEPTION_MARK;
968 if (UsePerfData) {
969 // jvmstat performance counters
970 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
971 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
972 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
973 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
974 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
975 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
976 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
977 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
978 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
979 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
981 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
982 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
983 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
984 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
985 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
986 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
987 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
988 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
989 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
990 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
991 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
992 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
993 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
996 // The following performance counters are added for measuring the impact
997 // of the bug fix of 6365597. They are mainly focused on finding out
998 // the behavior of system & user-defined classloader lock, whether
999 // ClassLoader.loadClass/findClass is being called synchronized or not.
1000 // Also two additional counters are created to see whether 'UnsyncloadClass'
1001 // flag is being set or not and how many times load_instance_class call
1002 // fails with linkageError etc.
1003 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1004 "systemLoaderLockContentionRate");
1005 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1006 "nonSystemLoaderLockContentionRate");
1007 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1008 "jvmFindLoadedClassNoLockCalls");
1009 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1010 "jvmDefineClassNoLockCalls");
1012 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1013 "jniDefineClassNoLockCalls");
1015 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1016 "unsafeDefineClassCalls");
1018 NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet");
1019 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1020 "loadInstanceClassFailRate");
1022 // increment the isUnsyncloadClass counter if UnsyncloadClass is set.
1023 if (UnsyncloadClass) {
1024 _isUnsyncloadClass->inc();
1025 }
1026 }
1028 // lookup zip library entry points
1029 load_zip_library();
1030 // initialize search path
1031 setup_bootstrap_search_path();
1032 if (LazyBootClassLoader) {
1033 // set up meta index which makes boot classpath initialization lazier
1034 setup_meta_index();
1035 }
1036 }
1039 jlong ClassLoader::classloader_time_ms() {
1040 return UsePerfData ?
1041 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1042 }
1044 jlong ClassLoader::class_init_count() {
1045 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1046 }
1048 jlong ClassLoader::class_init_time_ms() {
1049 return UsePerfData ?
1050 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1051 }
1053 jlong ClassLoader::class_verify_time_ms() {
1054 return UsePerfData ?
1055 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1056 }
1058 jlong ClassLoader::class_link_count() {
1059 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1060 }
1062 jlong ClassLoader::class_link_time_ms() {
1063 return UsePerfData ?
1064 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1065 }
1067 int ClassLoader::compute_Object_vtable() {
1068 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1069 // code to determine actual value from file
1070 // Would be value '11' if finals were in vtable
1071 int JDK_1_2_Object_vtable_size = 5;
1072 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1073 }
1076 void classLoader_init() {
1077 ClassLoader::initialize();
1078 }
1081 bool ClassLoader::get_canonical_path(char* orig, char* out, int len) {
1082 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1083 if (CanonicalizeEntry != NULL) {
1084 JNIEnv* env = JavaThread::current()->jni_environment();
1085 if ((CanonicalizeEntry)(env, os::native_path(orig), out, len) < 0) {
1086 return false;
1087 }
1088 } else {
1089 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1090 strncpy(out, orig, len);
1091 out[len - 1] = '\0';
1092 }
1093 return true;
1094 }
1096 #ifndef PRODUCT
1098 void ClassLoader::verify() {
1099 _package_hash_table->verify();
1100 }
1103 // CompileTheWorld
1104 //
1105 // Iterates over all class path entries and forces compilation of all methods
1106 // in all classes found. Currently, only zip/jar archives are searched.
1107 //
1108 // The classes are loaded by the Java level bootstrap class loader, and the
1109 // initializer is called. If DelayCompilationDuringStartup is true (default),
1110 // the interpreter will run the initialization code. Note that forcing
1111 // initialization in this way could potentially lead to initialization order
1112 // problems, in which case we could just force the initialization bit to be set.
1115 // We need to iterate over the contents of a zip/jar file, so we replicate the
1116 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1117 // since jzfile already has a void* definition.
1118 //
1119 // Note that this is only used in debug mode.
1120 //
1121 // HotSpot integration note:
1122 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1125 // JDK 1.3 version
1126 typedef struct real_jzentry13 { /* Zip file entry */
1127 char *name; /* entry name */
1128 jint time; /* modification time */
1129 jint size; /* size of uncompressed data */
1130 jint csize; /* size of compressed data (zero if uncompressed) */
1131 jint crc; /* crc of uncompressed data */
1132 char *comment; /* optional zip file comment */
1133 jbyte *extra; /* optional extra data */
1134 jint pos; /* position of LOC header (if negative) or data */
1135 } real_jzentry13;
1137 typedef struct real_jzfile13 { /* Zip file */
1138 char *name; /* zip file name */
1139 jint refs; /* number of active references */
1140 jint fd; /* open file descriptor */
1141 void *lock; /* read lock */
1142 char *comment; /* zip file comment */
1143 char *msg; /* zip error message */
1144 void *entries; /* array of hash cells */
1145 jint total; /* total number of entries */
1146 unsigned short *table; /* Hash chain heads: indexes into entries */
1147 jint tablelen; /* number of hash eads */
1148 real_jzfile13 *next; /* next zip file in search list */
1149 jzentry *cache; /* we cache the most recently freed jzentry */
1150 /* Information on metadata names in META-INF directory */
1151 char **metanames; /* array of meta names (may have null names) */
1152 jint metacount; /* number of slots in metanames array */
1153 /* If there are any per-entry comments, they are in the comments array */
1154 char **comments;
1155 } real_jzfile13;
1157 // JDK 1.2 version
1158 typedef struct real_jzentry12 { /* Zip file entry */
1159 char *name; /* entry name */
1160 jint time; /* modification time */
1161 jint size; /* size of uncompressed data */
1162 jint csize; /* size of compressed data (zero if uncompressed) */
1163 jint crc; /* crc of uncompressed data */
1164 char *comment; /* optional zip file comment */
1165 jbyte *extra; /* optional extra data */
1166 jint pos; /* position of LOC header (if negative) or data */
1167 struct real_jzentry12 *next; /* next entry in hash table */
1168 } real_jzentry12;
1170 typedef struct real_jzfile12 { /* Zip file */
1171 char *name; /* zip file name */
1172 jint refs; /* number of active references */
1173 jint fd; /* open file descriptor */
1174 void *lock; /* read lock */
1175 char *comment; /* zip file comment */
1176 char *msg; /* zip error message */
1177 real_jzentry12 *entries; /* array of zip entries */
1178 jint total; /* total number of entries */
1179 real_jzentry12 **table; /* hash table of entries */
1180 jint tablelen; /* number of buckets */
1181 jzfile *next; /* next zip file in search list */
1182 } real_jzfile12;
1185 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1186 // For now we only compile all methods in all classes in zip/jar files
1187 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1188 tty->cr();
1189 }
1192 bool ClassPathDirEntry::is_rt_jar() {
1193 return false;
1194 }
1196 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1197 if (JDK_Version::is_jdk12x_version()) {
1198 compile_the_world12(loader, THREAD);
1199 } else {
1200 compile_the_world13(loader, THREAD);
1201 }
1202 if (HAS_PENDING_EXCEPTION) {
1203 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1204 CLEAR_PENDING_EXCEPTION;
1205 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1206 tty->print_cr("Increase class metadata storage if a limit was set");
1207 } else {
1208 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1209 }
1210 }
1211 }
1213 // Version that works for JDK 1.3.x
1214 void ClassPathZipEntry::compile_the_world13(Handle loader, TRAPS) {
1215 real_jzfile13* zip = (real_jzfile13*) _zip;
1216 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1217 tty->cr();
1218 // Iterate over all entries in zip file
1219 for (int n = 0; ; n++) {
1220 real_jzentry13 * ze = (real_jzentry13 *)((*GetNextEntry)(_zip, n));
1221 if (ze == NULL) break;
1222 ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1223 }
1224 }
1227 // Version that works for JDK 1.2.x
1228 void ClassPathZipEntry::compile_the_world12(Handle loader, TRAPS) {
1229 real_jzfile12* zip = (real_jzfile12*) _zip;
1230 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1231 tty->cr();
1232 // Iterate over all entries in zip file
1233 for (int n = 0; ; n++) {
1234 real_jzentry12 * ze = (real_jzentry12 *)((*GetNextEntry)(_zip, n));
1235 if (ze == NULL) break;
1236 ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1237 }
1238 }
1240 bool ClassPathZipEntry::is_rt_jar() {
1241 if (JDK_Version::is_jdk12x_version()) {
1242 return is_rt_jar12();
1243 } else {
1244 return is_rt_jar13();
1245 }
1246 }
1248 // JDK 1.3 version
1249 bool ClassPathZipEntry::is_rt_jar13() {
1250 real_jzfile13* zip = (real_jzfile13*) _zip;
1251 int len = (int)strlen(zip->name);
1252 // Check whether zip name ends in "rt.jar"
1253 // This will match other archives named rt.jar as well, but this is
1254 // only used for debugging.
1255 return (len >= 6) && (strcasecmp(zip->name + len - 6, "rt.jar") == 0);
1256 }
1258 // JDK 1.2 version
1259 bool ClassPathZipEntry::is_rt_jar12() {
1260 real_jzfile12* zip = (real_jzfile12*) _zip;
1261 int len = (int)strlen(zip->name);
1262 // Check whether zip name ends in "rt.jar"
1263 // This will match other archives named rt.jar as well, but this is
1264 // only used for debugging.
1265 return (len >= 6) && (strcasecmp(zip->name + len - 6, "rt.jar") == 0);
1266 }
1268 void LazyClassPathEntry::compile_the_world(Handle loader, TRAPS) {
1269 ClassPathEntry* cpe = resolve_entry(THREAD);
1270 if (cpe != NULL) {
1271 cpe->compile_the_world(loader, CHECK);
1272 }
1273 }
1275 bool LazyClassPathEntry::is_rt_jar() {
1276 Thread* THREAD = Thread::current();
1277 ClassPathEntry* cpe = resolve_entry(THREAD);
1278 return (cpe != NULL) ? cpe->is_jar_file() : false;
1279 }
1281 void ClassLoader::compile_the_world() {
1282 EXCEPTION_MARK;
1283 HandleMark hm(THREAD);
1284 ResourceMark rm(THREAD);
1285 // Make sure we don't run with background compilation
1286 BackgroundCompilation = false;
1287 // Find bootstrap loader
1288 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1289 // Iterate over all bootstrap class path entries
1290 ClassPathEntry* e = _first_entry;
1291 jlong start = os::javaTimeMillis();
1292 while (e != NULL) {
1293 // We stop at rt.jar, unless it is the first bootstrap path entry
1294 if (e->is_rt_jar() && e != _first_entry) break;
1295 e->compile_the_world(system_class_loader, CATCH);
1296 e = e->next();
1297 }
1298 jlong end = os::javaTimeMillis();
1299 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, %d ms)",
1300 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1301 {
1302 // Print statistics as if before normal exit:
1303 extern void print_statistics();
1304 print_statistics();
1305 }
1306 vm_exit(0);
1307 }
1309 int ClassLoader::_compile_the_world_class_counter = 0;
1310 int ClassLoader::_compile_the_world_method_counter = 0;
1311 static int _codecache_sweep_counter = 0;
1313 // Filter out all exceptions except OOMs
1314 static void clear_pending_exception_if_not_oom(TRAPS) {
1315 if (HAS_PENDING_EXCEPTION &&
1316 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1317 CLEAR_PENDING_EXCEPTION;
1318 }
1319 // The CHECK at the caller will propagate the exception out
1320 }
1322 /**
1323 * Returns if the given method should be compiled when doing compile-the-world.
1324 *
1325 * TODO: This should be a private method in a CompileTheWorld class.
1326 */
1327 static bool can_be_compiled(methodHandle m, int comp_level) {
1328 assert(CompileTheWorld, "must be");
1330 // It's not valid to compile a native wrapper for MethodHandle methods
1331 // that take a MemberName appendix since the bytecode signature is not
1332 // correct.
1333 vmIntrinsics::ID iid = m->intrinsic_id();
1334 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1335 return false;
1336 }
1338 return CompilationPolicy::can_be_compiled(m, comp_level);
1339 }
1341 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1342 int len = (int)strlen(name);
1343 if (len > 6 && strcmp(".class", name + len - 6) == 0) {
1344 // We have a .class file
1345 char buffer[2048];
1346 strncpy(buffer, name, len - 6);
1347 buffer[len-6] = 0;
1348 // If the file has a period after removing .class, it's not really a
1349 // valid class file. The class loader will check everything else.
1350 if (strchr(buffer, '.') == NULL) {
1351 _compile_the_world_class_counter++;
1352 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
1354 // Construct name without extension
1355 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
1356 // Use loader to load and initialize class
1357 Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
1358 instanceKlassHandle k (THREAD, ik);
1359 if (k.not_null() && !HAS_PENDING_EXCEPTION) {
1360 k->initialize(THREAD);
1361 }
1362 bool exception_occurred = HAS_PENDING_EXCEPTION;
1363 clear_pending_exception_if_not_oom(CHECK);
1364 if (CompileTheWorldPreloadClasses && k.not_null()) {
1365 ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD);
1366 if (HAS_PENDING_EXCEPTION) {
1367 // If something went wrong in preloading we just ignore it
1368 clear_pending_exception_if_not_oom(CHECK);
1369 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
1370 }
1371 }
1373 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
1374 if (k.is_null() || exception_occurred) {
1375 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
1376 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
1377 } else {
1378 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
1379 // Preload all classes to get around uncommon traps
1380 // Iterate over all methods in class
1381 int comp_level = CompilationPolicy::policy()->initial_compile_level();
1382 for (int n = 0; n < k->methods()->length(); n++) {
1383 methodHandle m (THREAD, k->methods()->at(n));
1384 if (can_be_compiled(m, comp_level)) {
1385 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
1386 // Give sweeper a chance to keep up with CTW
1387 VM_ForceSafepoint op;
1388 VMThread::execute(&op);
1389 _codecache_sweep_counter = 0;
1390 }
1391 // Force compilation
1392 CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
1393 methodHandle(), 0, "CTW", THREAD);
1394 if (HAS_PENDING_EXCEPTION) {
1395 clear_pending_exception_if_not_oom(CHECK);
1396 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1397 } else {
1398 _compile_the_world_method_counter++;
1399 }
1400 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
1401 // Clobber the first compile and force second tier compilation
1402 nmethod* nm = m->code();
1403 if (nm != NULL) {
1404 // Throw out the code so that the code cache doesn't fill up
1405 nm->make_not_entrant();
1406 m->clear_code();
1407 }
1408 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
1409 methodHandle(), 0, "CTW", THREAD);
1410 if (HAS_PENDING_EXCEPTION) {
1411 clear_pending_exception_if_not_oom(CHECK);
1412 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1413 } else {
1414 _compile_the_world_method_counter++;
1415 }
1416 }
1417 } else {
1418 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1419 }
1421 nmethod* nm = m->code();
1422 if (nm != NULL) {
1423 // Throw out the code so that the code cache doesn't fill up
1424 nm->make_not_entrant();
1425 m->clear_code();
1426 }
1427 }
1428 }
1429 }
1430 }
1431 }
1432 }
1434 #endif //PRODUCT
1436 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1437 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1438 void PerfClassTraceTime::initialize() {
1439 if (!UsePerfData) return;
1441 if (_eventp != NULL) {
1442 // increment the event counter
1443 _eventp->inc();
1444 }
1446 // stop the current active thread-local timer to measure inclusive time
1447 _prev_active_event = -1;
1448 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1449 if (_timers[i].is_active()) {
1450 assert(_prev_active_event == -1, "should have only one active timer");
1451 _prev_active_event = i;
1452 _timers[i].stop();
1453 }
1454 }
1456 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1457 // start the inclusive timer if not recursively called
1458 _t.start();
1459 }
1461 // start thread-local timer of the given event type
1462 if (!_timers[_event_type].is_active()) {
1463 _timers[_event_type].start();
1464 }
1465 }
1467 PerfClassTraceTime::~PerfClassTraceTime() {
1468 if (!UsePerfData) return;
1470 // stop the thread-local timer as the event completes
1471 // and resume the thread-local timer of the event next on the stack
1472 _timers[_event_type].stop();
1473 jlong selftime = _timers[_event_type].ticks();
1475 if (_prev_active_event >= 0) {
1476 _timers[_prev_active_event].start();
1477 }
1479 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1481 // increment the counters only on the leaf call
1482 _t.stop();
1483 _timep->inc(_t.ticks());
1484 if (_selftimep != NULL) {
1485 _selftimep->inc(selftime);
1486 }
1487 // add all class loading related event selftime to the accumulated time counter
1488 ClassLoader::perf_accumulated_time()->inc(selftime);
1490 // reset the timer
1491 _timers[_event_type].reset();
1492 }