1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classFileStream.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderData.inline.hpp"
29 #include "classfile/classLoaderExt.hpp"
30 #include "classfile/javaClasses.hpp"
31 #include "classfile/jimage.hpp"
32 #include "classfile/moduleEntry.hpp"
33 #include "classfile/modules.hpp"
34 #include "classfile/packageEntry.hpp"
35 #include "classfile/klassFactory.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/vmSymbols.hpp"
38 #include "compiler/compileBroker.hpp"
39 #include "gc/shared/collectedHeap.inline.hpp"
40 #include "gc/shared/generation.hpp"
41 #include "interpreter/bytecodeStream.hpp"
42 #include "interpreter/oopMapCache.hpp"
43 #include "logging/logTag.hpp"
44 #include "memory/allocation.inline.hpp"
45 #include "memory/filemap.hpp"
46 #include "memory/oopFactory.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.inline.hpp"
49 #include "oops/instanceKlass.hpp"
50 #include "oops/instanceRefKlass.hpp"
51 #include "oops/objArrayOop.inline.hpp"
52 #include "oops/oop.inline.hpp"
53 #include "oops/symbol.hpp"
54 #include "prims/jvm_misc.hpp"
55 #include "runtime/arguments.hpp"
56 #include "runtime/compilationPolicy.hpp"
57 #include "runtime/fprofiler.hpp"
58 #include "runtime/handles.hpp"
59 #include "runtime/handles.inline.hpp"
60 #include "runtime/init.hpp"
61 #include "runtime/interfaceSupport.hpp"
62 #include "runtime/java.hpp"
63 #include "runtime/javaCalls.hpp"
64 #include "runtime/os.hpp"
65 #include "runtime/threadCritical.hpp"
66 #include "runtime/timer.hpp"
67 #include "runtime/vm_version.hpp"
68 #include "services/management.hpp"
69 #include "services/threadService.hpp"
70 #include "utilities/events.hpp"
71 #include "utilities/hashtable.inline.hpp"
72 #include "utilities/macros.hpp"
73 #if INCLUDE_CDS
74 #include "classfile/sharedClassUtil.hpp"
75 #include "classfile/sharedPathsMiscInfo.hpp"
76 #endif
77
78 // Entry points in zip.dll for loading zip/jar file entries
79
80 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg);
81 typedef void (JNICALL *ZipClose_t)(jzfile *zip);
82 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
83 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
84 typedef jboolean (JNICALL *ReadMappedEntry_t)(jzfile *zip, jzentry *entry, unsigned char **buf, char *namebuf);
85 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n);
86 typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg);
87 typedef jint (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len);
88
89 static ZipOpen_t ZipOpen = NULL;
90 static ZipClose_t ZipClose = NULL;
91 static FindEntry_t FindEntry = NULL;
92 static ReadEntry_t ReadEntry = NULL;
93 static ReadMappedEntry_t ReadMappedEntry = NULL;
94 static GetNextEntry_t GetNextEntry = NULL;
95 static canonicalize_fn_t CanonicalizeEntry = NULL;
96 static ZipInflateFully_t ZipInflateFully = NULL;
97 static Crc32_t Crc32 = NULL;
98
99 // Entry points for jimage.dll for loading jimage file entries
100
101 static JImageOpen_t JImageOpen = NULL;
102 static JImageClose_t JImageClose = NULL;
103 static JImagePackageToModule_t JImagePackageToModule = NULL;
104 static JImageFindResource_t JImageFindResource = NULL;
105 static JImageGetResource_t JImageGetResource = NULL;
106 static JImageResourceIterator_t JImageResourceIterator = NULL;
107 static JImage_ResourcePath_t JImageResourcePath = NULL;
108
109 // Globals
110
111 PerfCounter* ClassLoader::_perf_accumulated_time = NULL;
112 PerfCounter* ClassLoader::_perf_classes_inited = NULL;
113 PerfCounter* ClassLoader::_perf_class_init_time = NULL;
114 PerfCounter* ClassLoader::_perf_class_init_selftime = NULL;
115 PerfCounter* ClassLoader::_perf_classes_verified = NULL;
116 PerfCounter* ClassLoader::_perf_class_verify_time = NULL;
117 PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL;
118 PerfCounter* ClassLoader::_perf_classes_linked = NULL;
119 PerfCounter* ClassLoader::_perf_class_link_time = NULL;
120 PerfCounter* ClassLoader::_perf_class_link_selftime = NULL;
121 PerfCounter* ClassLoader::_perf_class_parse_time = NULL;
122 PerfCounter* ClassLoader::_perf_class_parse_selftime = NULL;
123 PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL;
124 PerfCounter* ClassLoader::_perf_shared_classload_time = NULL;
125 PerfCounter* ClassLoader::_perf_sys_classload_time = NULL;
126 PerfCounter* ClassLoader::_perf_app_classload_time = NULL;
127 PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL;
128 PerfCounter* ClassLoader::_perf_app_classload_count = NULL;
129 PerfCounter* ClassLoader::_perf_define_appclasses = NULL;
130 PerfCounter* ClassLoader::_perf_define_appclass_time = NULL;
131 PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL;
132 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL;
133 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL;
134 PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
135 PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
136 PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
137 PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
138 PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
139 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL;
140 PerfCounter* ClassLoader::_isUnsyncloadClass = NULL;
141 PerfCounter* ClassLoader::_load_instance_class_failCounter = NULL;
142
143 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = NULL;
144 ClassPathEntry* ClassLoader::_first_entry = NULL;
145 ClassPathEntry* ClassLoader::_last_entry = NULL;
146 int ClassLoader::_num_entries = 0;
147 ClassPathEntry* ClassLoader::_first_append_entry = NULL;
148 bool ClassLoader::_has_jimage = false;
149 #if INCLUDE_CDS
150 GrowableArray<char*>* ClassLoader::_boot_modules_array = NULL;
151 GrowableArray<char*>* ClassLoader::_platform_modules_array = NULL;
152 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL;
153 #endif
154
155 // helper routines
156 bool string_starts_with(const char* str, const char* str_to_find) {
157 size_t str_len = strlen(str);
158 size_t str_to_find_len = strlen(str_to_find);
159 if (str_to_find_len > str_len) {
160 return false;
161 }
162 return (strncmp(str, str_to_find, str_to_find_len) == 0);
163 }
164
165 static const char* get_jimage_version_string() {
166 static char version_string[10] = "";
167 if (version_string[0] == '\0') {
168 jio_snprintf(version_string, sizeof(version_string), "%d.%d",
169 Abstract_VM_Version::vm_major_version(), Abstract_VM_Version::vm_minor_version());
170 }
171 return (const char*)version_string;
172 }
173
174 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) {
175 size_t str_len = strlen(str);
176 size_t str_to_find_len = strlen(str_to_find);
177 if (str_to_find_len > str_len) {
178 return false;
179 }
180 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
181 }
182
183 // Used to obtain the package name from a fully qualified class name.
184 // It is the responsibility of the caller to establish a ResourceMark.
185 const char* ClassLoader::package_from_name(const char* const class_name, bool* bad_class_name) {
186 if (class_name == NULL) {
187 if (bad_class_name != NULL) {
188 *bad_class_name = true;
189 }
190 return NULL;
191 }
192
193 if (bad_class_name != NULL) {
194 *bad_class_name = false;
195 }
196
197 const char* const last_slash = strrchr(class_name, '/');
198 if (last_slash == NULL) {
199 // No package name
200 return NULL;
201 }
202
203 char* class_name_ptr = (char*) class_name;
204 // Skip over '['s
205 if (*class_name_ptr == '[') {
206 do {
207 class_name_ptr++;
208 } while (*class_name_ptr == '[');
209
210 // Fully qualified class names should not contain a 'L'.
211 // Set bad_class_name to true to indicate that the package name
212 // could not be obtained due to an error condition.
213 // In this situation, is_same_class_package returns false.
214 if (*class_name_ptr == 'L') {
215 if (bad_class_name != NULL) {
216 *bad_class_name = true;
217 }
218 return NULL;
219 }
220 }
221
222 int length = last_slash - class_name_ptr;
223
224 // A class name could have just the slash character in the name.
225 if (length <= 0) {
226 // No package name
227 if (bad_class_name != NULL) {
228 *bad_class_name = true;
229 }
230 return NULL;
231 }
232
233 // drop name after last slash (including slash)
234 // Ex., "java/lang/String.class" => "java/lang"
235 char* pkg_name = NEW_RESOURCE_ARRAY(char, length + 1);
236 strncpy(pkg_name, class_name_ptr, length);
237 *(pkg_name+length) = '\0';
238
239 return (const char *)pkg_name;
240 }
241
242 // Given a fully qualified class name, find its defining package in the class loader's
243 // package entry table.
244 static PackageEntry* get_package_entry(const char* class_name, ClassLoaderData* loader_data, TRAPS) {
245 ResourceMark rm(THREAD);
246 const char *pkg_name = ClassLoader::package_from_name(class_name);
247 if (pkg_name == NULL) {
248 return NULL;
249 }
250 PackageEntryTable* pkgEntryTable = loader_data->packages();
251 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(pkg_name, CHECK_NULL);
252 return pkgEntryTable->lookup_only(pkg_symbol);
253 }
254
255 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() {
256 char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
257 strcpy(copy, dir);
258 _dir = copy;
259 }
260
261
262 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
263 // construct full path name
264 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
265 if (jio_snprintf(path, JVM_MAXPATHLEN, "%s%s%s", _dir, os::file_separator(), name) == -1) {
266 FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN);
267 return NULL;
268 }
269 // check if file exists
270 struct stat st;
271 if (os::stat(path, &st) == 0) {
272 #if INCLUDE_CDS
273 if (DumpSharedSpaces) {
274 // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so
275 // we should never find a file underneath it -- unless user has added a new file while we are running
276 // the dump, in which case let's quit!
277 ShouldNotReachHere();
278 }
279 #endif
280 // found file, open it
281 int file_handle = os::open(path, 0, 0);
282 if (file_handle != -1) {
283 // read contents into resource array
284 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
285 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
286 // close file
287 os::close(file_handle);
288 // construct ClassFileStream
289 if (num_read == (size_t)st.st_size) {
290 if (UsePerfData) {
291 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
292 }
293 FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN);
294 // Resource allocated
295 return new ClassFileStream(buffer,
296 st.st_size,
297 _dir,
298 ClassFileStream::verify);
299 }
300 }
301 }
302 FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN);
303 return NULL;
304 }
305
306 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name, bool is_boot_append) : ClassPathEntry() {
307 _zip = zip;
308 char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
309 strcpy(copy, zip_name);
310 _zip_name = copy;
311 _is_boot_append = is_boot_append;
312 _multi_versioned = _unknown;
313 }
314
315 ClassPathZipEntry::~ClassPathZipEntry() {
316 if (ZipClose != NULL) {
317 (*ZipClose)(_zip);
318 }
319 FREE_C_HEAP_ARRAY(char, _zip_name);
320 }
321
322 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
323 // enable call to C land
324 JavaThread* thread = JavaThread::current();
325 ThreadToNativeFromVM ttn(thread);
326 // check whether zip archive contains name
327 jint name_len;
328 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
329 if (entry == NULL) return NULL;
330 u1* buffer;
331 char name_buf[128];
332 char* filename;
333 if (name_len < 128) {
334 filename = name_buf;
335 } else {
336 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
337 }
338
339 // file found, get pointer to the entry in mmapped jar file.
340 if (ReadMappedEntry == NULL ||
341 !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) {
342 // mmapped access not available, perhaps due to compression,
343 // read contents into resource array
344 int size = (*filesize) + ((nul_terminate) ? 1 : 0);
345 buffer = NEW_RESOURCE_ARRAY(u1, size);
346 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
347 }
348
349 // return result
350 if (nul_terminate) {
351 buffer[*filesize] = 0;
352 }
353 return buffer;
354 }
355
356 #if INCLUDE_CDS
357 u1* ClassPathZipEntry::open_versioned_entry(const char* name, jint* filesize, TRAPS) {
358 u1* buffer = NULL;
359 if (DumpSharedSpaces && !_is_boot_append) {
360 // We presume default is multi-release enabled
361 const char* multi_ver = Arguments::get_property("jdk.util.jar.enableMultiRelease");
362 const char* verstr = Arguments::get_property("jdk.util.jar.version");
363 bool is_multi_ver = (multi_ver == NULL ||
364 strcmp(multi_ver, "true") == 0 ||
365 strcmp(multi_ver, "force") == 0) &&
366 is_multiple_versioned(THREAD);
367 // command line version setting
368 int version = 0;
369 const int base_version = 8; // JDK8
370 int cur_ver = JDK_Version::current().major_version();
371 if (verstr != NULL) {
372 version = atoi(verstr);
373 if (version < base_version || version > cur_ver) {
374 is_multi_ver = false;
375 // print out warning, do not use assertion here since it will continue to look
376 // for proper version.
377 warning("JDK%d is not supported in multiple version jars", version);
378 }
379 }
380
381 if (is_multi_ver) {
382 int n;
383 char* entry_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
384 if (version > 0) {
385 n = jio_snprintf(entry_name, JVM_MAXPATHLEN, "META-INF/versions/%d/%s", version, name);
386 entry_name[n] = '\0';
387 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
388 if (buffer == NULL) {
389 warning("Could not find %s in %s, try to find highest version instead", entry_name, _zip_name);
390 }
391 }
392 if (buffer == NULL) {
393 for (int i = cur_ver; i >= base_version; i--) {
394 n = jio_snprintf(entry_name, JVM_MAXPATHLEN, "META-INF/versions/%d/%s", i, name);
395 entry_name[n] = '\0';
396 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
397 if (buffer != NULL) {
398 break;
399 }
400 }
401 }
402 FREE_RESOURCE_ARRAY(char, entry_name, JVM_MAXPATHLEN);
403 }
404 }
405 return buffer;
406 }
407
408 bool ClassPathZipEntry::is_multiple_versioned(TRAPS) {
409 assert(DumpSharedSpaces, "called only at dump time");
410 if (_multi_versioned != _unknown) {
411 return (_multi_versioned == _yes) ? true : false;
412 }
413 jint size;
414 char* buffer = (char*)open_entry("META-INF/MANIFEST.MF", &size, true, CHECK_false);
415 if (buffer != NULL) {
416 char* p = buffer;
417 for ( ; *p; ++p) *p = tolower(*p);
418 if (strstr(buffer, "multi-release: true") != NULL) {
419 _multi_versioned = _yes;
420 return true;
421 }
422 }
423 _multi_versioned = _no;
424 return false;
425 }
426 #endif // INCLUDE_CDS
427
428 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
429 jint filesize;
430 u1* buffer = open_versioned_entry(name, &filesize, CHECK_NULL);
431 if (buffer == NULL) {
432 buffer = open_entry(name, &filesize, false, CHECK_NULL);
433 if (buffer == NULL) {
434 return NULL;
435 }
436 }
437 if (UsePerfData) {
438 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
439 }
440 // Resource allocated
441 return new ClassFileStream(buffer,
442 filesize,
443 _zip_name,
444 ClassFileStream::verify);
445 }
446
447 // invoke function for each entry in the zip file
448 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
449 JavaThread* thread = JavaThread::current();
450 HandleMark handle_mark(thread);
451 ThreadToNativeFromVM ttn(thread);
452 for (int n = 0; ; n++) {
453 jzentry * ze = ((*GetNextEntry)(_zip, n));
454 if (ze == NULL) break;
455 (*f)(ze->name, context);
456 }
457 }
458
459 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
460 ClassPathEntry(),
461 _jimage(jimage) {
462 guarantee(jimage != NULL, "jimage file is null");
463 guarantee(name != NULL, "jimage file name is null");
464 size_t len = strlen(name) + 1;
465 _name = NEW_C_HEAP_ARRAY(const char, len, mtClass);
466 strncpy((char *)_name, name, len);
467 }
468
469 ClassPathImageEntry::~ClassPathImageEntry() {
470 if (_name != NULL) {
471 FREE_C_HEAP_ARRAY(const char, _name);
472 _name = NULL;
473 }
474 if (_jimage != NULL) {
475 (*JImageClose)(_jimage);
476 _jimage = NULL;
477 }
478 }
479
480 // For a class in a named module, look it up in the jimage file using this syntax:
481 // /<module-name>/<package-name>/<base-class>
482 //
483 // Assumptions:
484 // 1. There are no unnamed modules in the jimage file.
485 // 2. A package is in at most one module in the jimage file.
486 //
487 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
488 jlong size;
489 JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size);
490
491 if (location == 0) {
492 ResourceMark rm;
493 const char* pkg_name = ClassLoader::package_from_name(name);
494
495 if (pkg_name != NULL) {
496 if (!Universe::is_module_initialized()) {
497 location = (*JImageFindResource)(_jimage, "java.base", get_jimage_version_string(), name, &size);
498 #if INCLUDE_CDS
499 // CDS uses the boot class loader to load classes whose packages are in
500 // modules defined for other class loaders. So, for now, get their module
501 // names from the "modules" jimage file.
502 if (DumpSharedSpaces && location == 0) {
503 const char* module_name = (*JImagePackageToModule)(_jimage, pkg_name);
504 if (module_name != NULL) {
505 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
506 }
507 }
508 #endif
509
510 } else {
511 PackageEntry* package_entry = get_package_entry(name, ClassLoaderData::the_null_class_loader_data(), THREAD);
512 if (package_entry != NULL) {
513 ResourceMark rm;
514 // Get the module name
515 ModuleEntry* module = package_entry->module();
516 assert(module != NULL, "Boot classLoader package missing module");
517 assert(module->is_named(), "Boot classLoader package is in unnamed module");
518 const char* module_name = module->name()->as_C_string();
519 if (module_name != NULL) {
520 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
521 }
522 }
523 }
524 }
525 }
526 if (location != 0) {
527 if (UsePerfData) {
528 ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
529 }
530 char* data = NEW_RESOURCE_ARRAY(char, size);
531 (*JImageGetResource)(_jimage, location, data, size);
532 // Resource allocated
533 return new ClassFileStream((u1*)data,
534 (int)size,
535 _name,
536 ClassFileStream::verify);
537 }
538
539 return NULL;
540 }
541
542 #ifndef PRODUCT
543 bool ctw_visitor(JImageFile* jimage,
544 const char* module_name, const char* version, const char* package,
545 const char* name, const char* extension, void* arg) {
546 if (strcmp(extension, "class") == 0) {
547 Thread* THREAD = Thread::current();
548 ResourceMark rm(THREAD);
549 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JIMAGE_MAX_PATH);
550 jio_snprintf(path, JIMAGE_MAX_PATH - 1, "%s/%s.class", package, name);
551 ClassLoader::compile_the_world_in(path, *(Handle*)arg, THREAD);
552 return !HAS_PENDING_EXCEPTION;
553 }
554 return true;
555 }
556
557 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) {
558 tty->print_cr("CompileTheWorld : Compiling all classes in %s", name());
559 tty->cr();
560 (*JImageResourceIterator)(_jimage, (JImageResourceVisitor_t)ctw_visitor, (void *)&loader);
561 if (HAS_PENDING_EXCEPTION) {
562 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
563 CLEAR_PENDING_EXCEPTION;
564 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
565 tty->print_cr("Increase class metadata storage if a limit was set");
566 } else {
567 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
568 }
569 }
570 }
571 #endif
572
573 bool ClassPathImageEntry::is_jrt() {
574 return ClassLoader::is_jrt(name());
575 }
576
577 #if INCLUDE_CDS
578 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
579 assert(DumpSharedSpaces, "only called at dump time");
580 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure");
581 vm_exit_during_initialization(error, message);
582 }
583 #endif
584
585 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
586 _module_name = module_name;
587 _module_first_entry = NULL;
588 _module_last_entry = NULL;
589 }
590
591 ModuleClassPathList::~ModuleClassPathList() {
592 // Clean out each ClassPathEntry on list
593 ClassPathEntry* e = _module_first_entry;
594 while (e != NULL) {
595 ClassPathEntry* next_entry = e->next();
596 delete e;
597 e = next_entry;
598 }
599 }
600
601 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
602 if (new_entry != NULL) {
603 if (_module_last_entry == NULL) {
604 _module_first_entry = _module_last_entry = new_entry;
605 } else {
606 _module_last_entry->set_next(new_entry);
607 _module_last_entry = new_entry;
608 }
609 }
610 }
611
612 void ClassLoader::trace_class_path(const char* msg, const char* name) {
613 if (log_is_enabled(Info, class, path)) {
614 ResourceMark rm;
615 outputStream* out = Log(class, path)::info_stream();
616 if (msg) {
617 out->print("%s", msg);
618 }
619 if (name) {
620 if (strlen(name) < 256) {
621 out->print("%s", name);
622 } else {
623 // For very long paths, we need to print each character separately,
624 // as print_cr() has a length limit
625 while (name[0] != '\0') {
626 out->print("%c", name[0]);
627 name++;
628 }
629 }
630 }
631 out->cr();
632 }
633 }
634
635 #if INCLUDE_CDS
636 void ClassLoader::check_shared_classpath(const char *path) {
637 if (strcmp(path, "") == 0) {
638 exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
639 }
640
641 struct stat st;
642 if (os::stat(path, &st) == 0) {
643 if ((st.st_mode & S_IFREG) != S_IFREG) { // is directory
644 if (!os::dir_is_empty(path)) {
645 tty->print_cr("Error: non-empty directory '%s'", path);
646 exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL);
647 }
648 }
649 }
650 }
651 #endif
652
653 void ClassLoader::setup_bootstrap_search_path() {
654 assert(_first_entry == NULL, "should not setup bootstrap class search path twice");
655 const char* sys_class_path = Arguments::get_sysclasspath();
656 const char* java_class_path = Arguments::get_appclasspath();
657 if (PrintSharedArchiveAndExit) {
658 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
659 // the same as the bootcp of the shared archive.
660 } else {
661 trace_class_path("bootstrap loader class path=", sys_class_path);
662 trace_class_path("classpath: ", java_class_path);
663 }
664 #if INCLUDE_CDS
665 if (DumpSharedSpaces) {
666 _shared_paths_misc_info->add_boot_classpath(sys_class_path);
667 }
668 #endif
669 setup_search_path(sys_class_path, true);
670 }
671
672 #if INCLUDE_CDS
673 int ClassLoader::get_shared_paths_misc_info_size() {
674 return _shared_paths_misc_info->get_used_bytes();
675 }
676
677 void* ClassLoader::get_shared_paths_misc_info() {
678 return _shared_paths_misc_info->buffer();
679 }
680
681 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
682 SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
683 bool result = checker->check();
684 delete checker;
685 return result;
686 }
687 #endif
688
689 // Construct the array of module/path pairs as specified to --patch-module
690 // for the boot loader to search ahead of the jimage, if the class being
691 // loaded is defined to a module that has been specified to --patch-module.
692 void ClassLoader::setup_patch_mod_entries() {
693 Thread* THREAD = Thread::current();
694 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
695 int num_of_entries = patch_mod_args->length();
696
697 // Set up the boot loader's patch_mod_entries list
698 _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true);
699
700 for (int i = 0; i < num_of_entries; i++) {
701 const char* module_name = (patch_mod_args->at(i))->module_name();
702 Symbol* const module_sym = SymbolTable::lookup(module_name, (int)strlen(module_name), CHECK);
703 assert(module_sym != NULL, "Failed to obtain Symbol for module name");
704 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
705
706 char* class_path = (patch_mod_args->at(i))->path_string();
707 int len = (int)strlen(class_path);
708 int end = 0;
709 // Iterate over the module's class path entries
710 for (int start = 0; start < len; start = end) {
711 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
712 end++;
713 }
714 EXCEPTION_MARK;
715 ResourceMark rm(THREAD);
716 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
717 strncpy(path, &class_path[start], end - start);
718 path[end - start] = '\0';
719
720 struct stat st;
721 if (os::stat(path, &st) == 0) {
722 // File or directory found
723 Thread* THREAD = Thread::current();
724 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
725 // If the path specification is valid, enter it into this module's list
726 if (new_entry != NULL) {
727 module_cpl->add_to_list(new_entry);
728 }
729 }
730
731 while (class_path[end] == os::path_separator()[0]) {
732 end++;
733 }
734 }
735
736 // Record the module into the list of --patch-module entries only if
737 // valid ClassPathEntrys have been created
738 if (module_cpl->module_first_entry() != NULL) {
739 _patch_mod_entries->push(module_cpl);
740 }
741 }
742 }
743
744 void ClassLoader::setup_search_path(const char *class_path, bool bootstrap_search) {
745 int offset = 0;
746 int len = (int)strlen(class_path);
747 int end = 0;
748 bool mark_append_entry = false;
749
750 // Iterate over class path entries
751 for (int start = 0; start < len; start = end) {
752 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
753 end++;
754 }
755 EXCEPTION_MARK;
756 ResourceMark rm(THREAD);
757 mark_append_entry = (mark_append_entry ||
758 (bootstrap_search && (start == Arguments::bootclassloader_append_index())));
759 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
760 strncpy(path, &class_path[start], end - start);
761 path[end - start] = '\0';
762 update_class_path_entry_list(path, false, mark_append_entry, false, bootstrap_search);
763
764 // Check on the state of the boot loader's append path
765 if (mark_append_entry && (_first_append_entry == NULL)) {
766 // Failure to mark the first append entry, most likely
767 // due to a non-existent path. Record the next entry
768 // as the first boot loader append entry.
769 mark_append_entry = true;
770 } else {
771 mark_append_entry = false;
772 }
773
774 #if INCLUDE_CDS
775 if (DumpSharedSpaces) {
776 check_shared_classpath(path);
777 }
778 #endif
779 while (class_path[end] == os::path_separator()[0]) {
780 end++;
781 }
782 }
783 }
784
785 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
786 bool throw_exception,
787 bool is_boot_append, TRAPS) {
788 JavaThread* thread = JavaThread::current();
789 ClassPathEntry* new_entry = NULL;
790 if ((st->st_mode & S_IFREG) == S_IFREG) {
791 ResourceMark rm(thread);
792 // Regular file, should be a zip or jimage file
793 // Canonicalized filename
794 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
795 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
796 // This matches the classic VM
797 if (throw_exception) {
798 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
799 } else {
800 return NULL;
801 }
802 }
803 jint error;
804 JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
805 if (jimage != NULL) {
806 new_entry = new ClassPathImageEntry(jimage, canonical_path);
807 } else {
808 char* error_msg = NULL;
809 jzfile* zip;
810 {
811 // enable call to C land
812 ThreadToNativeFromVM ttn(thread);
813 HandleMark hm(thread);
814 zip = (*ZipOpen)(canonical_path, &error_msg);
815 }
816 if (zip != NULL && error_msg == NULL) {
817 new_entry = new ClassPathZipEntry(zip, path, is_boot_append);
818 } else {
819 char *msg;
820 if (error_msg == NULL) {
821 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ;
822 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
823 } else {
824 int len = (int)(strlen(path) + strlen(error_msg) + 128);
825 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ;
826 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
827 }
828 // Don't complain about bad jar files added via -Xbootclasspath/a:.
829 if (throw_exception && is_init_completed()) {
830 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
831 } else {
832 return NULL;
833 }
834 }
835 }
836 log_info(class, path)("opened: %s", path);
837 log_info(class, load)("opened: %s", path);
838 } else {
839 // Directory
840 new_entry = new ClassPathDirEntry(path);
841 log_info(class, load)("path: %s", path);
842 }
843 return new_entry;
844 }
845
846
847 // Create a class path zip entry for a given path (return NULL if not found
848 // or zip/JAR file cannot be opened)
849 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
850 // check for a regular file
851 struct stat st;
852 if (os::stat(path, &st) == 0) {
853 if ((st.st_mode & S_IFREG) == S_IFREG) {
854 char canonical_path[JVM_MAXPATHLEN];
855 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
856 char* error_msg = NULL;
857 jzfile* zip;
858 {
859 // enable call to C land
860 JavaThread* thread = JavaThread::current();
861 ThreadToNativeFromVM ttn(thread);
862 HandleMark hm(thread);
863 zip = (*ZipOpen)(canonical_path, &error_msg);
864 }
865 if (zip != NULL && error_msg == NULL) {
866 // create using canonical path
867 return new ClassPathZipEntry(zip, canonical_path, is_boot_append);
868 }
869 }
870 }
871 }
872 return NULL;
873 }
874
875 // The boot class loader must adhere to specfic visibility rules.
876 // Prior to loading a class in a named package, the package is checked
877 // to see if it is in a module defined to the boot loader. If the
878 // package is not in a module defined to the boot loader, the class
879 // must be loaded only in the boot loader's append path, which
880 // consists of [-Xbootclasspath/a]; [jvmti appended entries]
881 void ClassLoader::set_first_append_entry(ClassPathEntry *new_entry) {
882 if (_first_append_entry == NULL) {
883 _first_append_entry = new_entry;
884 }
885 }
886
887 // returns true if entry already on class path
888 bool ClassLoader::contains_entry(ClassPathEntry *entry) {
889 ClassPathEntry* e = _first_entry;
890 while (e != NULL) {
891 // assume zip entries have been canonicalized
892 if (strcmp(entry->name(), e->name()) == 0) {
893 return true;
894 }
895 e = e->next();
896 }
897 return false;
898 }
899
900 void ClassLoader::add_to_list(ClassPathEntry *new_entry) {
901 if (new_entry != NULL) {
902 if (_last_entry == NULL) {
903 _first_entry = _last_entry = new_entry;
904 } else {
905 _last_entry->set_next(new_entry);
906 _last_entry = new_entry;
907 }
908 }
909 _num_entries ++;
910 }
911
912 void ClassLoader::prepend_to_list(ClassPathEntry *new_entry) {
913 if (new_entry != NULL) {
914 if (_last_entry == NULL) {
915 _first_entry = _last_entry = new_entry;
916 } else {
917 new_entry->set_next(_first_entry);
918 _first_entry = new_entry;
919 }
920 }
921 _num_entries ++;
922 }
923
924 void ClassLoader::add_to_list(const char *apath) {
925 update_class_path_entry_list((char*)apath, false, false, false, false);
926 }
927
928 void ClassLoader::prepend_to_list(const char *apath) {
929 update_class_path_entry_list((char*)apath, false, false, true, false);
930 }
931
932 // Returns true IFF the file/dir exists and the entry was successfully created.
933 bool ClassLoader::update_class_path_entry_list(const char *path,
934 bool check_for_duplicates,
935 bool mark_append_entry,
936 bool prepend_entry,
937 bool is_boot_append,
938 bool throw_exception) {
939 struct stat st;
940 if (os::stat(path, &st) == 0) {
941 // File or directory found
942 ClassPathEntry* new_entry = NULL;
943 Thread* THREAD = Thread::current();
944 new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false));
945 if (new_entry == NULL) {
946 return false;
947 }
948
949 // Ensure that the first boot loader append entry will always be set correctly.
950 assert((!mark_append_entry ||
951 (mark_append_entry && (!check_for_duplicates || !contains_entry(new_entry)))),
952 "failed to mark boot loader's first append boundary");
953
954 // Do not reorder the bootclasspath which would break get_system_package().
955 // Add new entry to linked list
956
957 if (!check_for_duplicates || !contains_entry(new_entry)) {
958 ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry, prepend_entry);
959 if (mark_append_entry) {
960 set_first_append_entry(new_entry);
961 }
962 }
963 return true;
964 } else {
965 #if INCLUDE_CDS
966 if (DumpSharedSpaces) {
967 _shared_paths_misc_info->add_nonexist_path(path);
968 }
969 #endif
970 return false;
971 }
972 }
973
974 void ClassLoader::print_bootclasspath() {
975 ClassPathEntry* e;
976 tty->print("[bootclasspath= ");
977
978 // Print --patch-module module/path specifications first
979 if (_patch_mod_entries != NULL) {
980 ResourceMark rm;
981 int num_of_entries = _patch_mod_entries->length();
982 for (int i = 0; i < num_of_entries; i++) {
983 ModuleClassPathList* mpl = _patch_mod_entries->at(i);
984 tty->print("%s=", mpl->module_name()->as_C_string());
985 e = mpl->module_first_entry();
986 while (e != NULL) {
987 tty->print("%s", e->name());
988 e = e->next();
989 if (e != NULL) {
990 tty->print("%s", os::path_separator());
991 }
992 }
993 tty->print(" ;");
994 }
995 }
996
997 e = _first_entry;
998 while (e != NULL) {
999 tty->print("%s ;", e->name());
1000 e = e->next();
1001 }
1002 tty->print_cr("]");
1003 }
1004
1005 void ClassLoader::load_zip_library() {
1006 assert(ZipOpen == NULL, "should not load zip library twice");
1007 // First make sure native library is loaded
1008 os::native_java_library();
1009 // Load zip library
1010 char path[JVM_MAXPATHLEN];
1011 char ebuf[1024];
1012 void* handle = NULL;
1013 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
1014 handle = os::dll_load(path, ebuf, sizeof ebuf);
1015 }
1016 if (handle == NULL) {
1017 vm_exit_during_initialization("Unable to load ZIP library", path);
1018 }
1019 // Lookup zip entry points
1020 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
1021 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
1022 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
1023 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
1024 ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, os::dll_lookup(handle, "ZIP_ReadMappedEntry"));
1025 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
1026 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
1027 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
1028
1029 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
1030 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
1031 GetNextEntry == NULL || Crc32 == NULL) {
1032 vm_exit_during_initialization("Corrupted ZIP library", path);
1033 }
1034
1035 if (ZipInflateFully == NULL) {
1036 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
1037 }
1038
1039 // Lookup canonicalize entry in libjava.dll
1040 void *javalib_handle = os::native_java_library();
1041 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
1042 // This lookup only works on 1.3. Do not check for non-null here
1043 }
1044
1045 void ClassLoader::load_jimage_library() {
1046 // First make sure native library is loaded
1047 os::native_java_library();
1048 // Load jimage library
1049 char path[JVM_MAXPATHLEN];
1050 char ebuf[1024];
1051 void* handle = NULL;
1052 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
1053 handle = os::dll_load(path, ebuf, sizeof ebuf);
1054 }
1055 if (handle == NULL) {
1056 vm_exit_during_initialization("Unable to load jimage library", path);
1057 }
1058
1059 // Lookup jimage entry points
1060 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open"));
1061 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found");
1062 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close"));
1063 guarantee(JImageClose != NULL, "function JIMAGE_Close not found");
1064 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule"));
1065 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found");
1066 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource"));
1067 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found");
1068 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource"));
1069 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found");
1070 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator"));
1071 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found");
1072 JImageResourcePath = CAST_TO_FN_PTR(JImage_ResourcePath_t, os::dll_lookup(handle, "JIMAGE_ResourcePath"));
1073 guarantee(JImageResourcePath != NULL, "function JIMAGE_ResourcePath not found");
1074 }
1075
1076 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
1077 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
1078 }
1079
1080 int ClassLoader::crc32(int crc, const char* buf, int len) {
1081 assert(Crc32 != NULL, "ZIP_CRC32 is not found");
1082 return (*Crc32)(crc, (const jbyte*)buf, len);
1083 }
1084
1085 #if INCLUDE_CDS
1086 void ClassLoader::initialize_module_loader_map(JImageFile* jimage) {
1087 if (!DumpSharedSpaces) {
1088 return; // only needed for CDS dump time
1089 }
1090
1091 ResourceMark rm;
1092 jlong size;
1093 JImageLocationRef location = (*JImageFindResource)(jimage, "java.base", get_jimage_version_string(), MODULE_LOADER_MAP, &size);
1094 if (location == 0) {
1095 vm_exit_during_initialization(
1096 "Cannot find ModuleLoaderMap location from modules jimage.", NULL);
1097 }
1098 char* buffer = NEW_RESOURCE_ARRAY(char, size + 1);
1099 buffer[size] = '\0';
1100 jlong read = (*JImageGetResource)(jimage, location, buffer, size);
1101 if (read != size) {
1102 vm_exit_during_initialization(
1103 "Cannot find ModuleLoaderMap resource from modules jimage.", NULL);
1104 }
1105 char* char_buf = (char*)buffer;
1106 int buflen = (int)strlen(char_buf);
1107 char* begin_ptr = char_buf;
1108 char* end_ptr = strchr(begin_ptr, '\n');
1109 bool process_boot_modules = false;
1110 _boot_modules_array = new (ResourceObj::C_HEAP, mtModule)
1111 GrowableArray<char*>(INITIAL_BOOT_MODULES_ARRAY_SIZE, true);
1112 _platform_modules_array = new (ResourceObj::C_HEAP, mtModule)
1113 GrowableArray<char*>(INITIAL_PLATFORM_MODULES_ARRAY_SIZE, true);
1114 while (end_ptr != NULL && (end_ptr - char_buf) < buflen) {
1115 // Allocate a buffer from the C heap to be appended to the _boot_modules_array
1116 // or the _platform_modules_array.
1117 char* temp_name = NEW_C_HEAP_ARRAY(char, (size_t)(end_ptr - begin_ptr + 1), mtInternal);
1118 strncpy(temp_name, begin_ptr, end_ptr - begin_ptr);
1119 temp_name[end_ptr - begin_ptr] = '\0';
1120 if (strncmp(temp_name, "BOOT", 4) == 0) {
1121 process_boot_modules = true;
1122 FREE_C_HEAP_ARRAY(char, temp_name);
1123 } else if (strncmp(temp_name, "PLATFORM", 8) == 0) {
1124 process_boot_modules = false;
1125 FREE_C_HEAP_ARRAY(char, temp_name);
1126 } else {
1127 // module name
1128 if (process_boot_modules) {
1129 _boot_modules_array->append(temp_name);
1130 } else {
1131 _platform_modules_array->append(temp_name);
1132 }
1133 }
1134 begin_ptr = ++end_ptr;
1135 end_ptr = strchr(begin_ptr, '\n');
1136 }
1137 }
1138 #endif
1139
1140 // Function add_package extracts the package from the fully qualified class name
1141 // and checks if the package is in the boot loader's package entry table. If so,
1142 // then it sets the classpath_index in the package entry record.
1143 //
1144 // The classpath_index field is used to find the entry on the boot loader class
1145 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
1146 // in an unnamed module. It is also used to indicate (for all packages whose
1147 // classes are loaded by the boot loader) that at least one of the package's
1148 // classes has been loaded.
1149 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) {
1150 assert(fullq_class_name != NULL, "just checking");
1151
1152 // Get package name from fully qualified class name.
1153 ResourceMark rm;
1154 const char *cp = package_from_name(fullq_class_name);
1155 if (cp != NULL) {
1156 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();
1157 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp, CHECK_false);
1158 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol);
1159 if (pkg_entry != NULL) {
1160 assert(classpath_index != -1, "Unexpected classpath_index");
1161 pkg_entry->set_classpath_index(classpath_index);
1162 } else {
1163 return false;
1164 }
1165 }
1166 return true;
1167 }
1168
1169 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1170 // Look up the name in the boot loader's package entry table.
1171 if (name != NULL) {
1172 TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL);
1173 // Look for the package entry in the boot loader's package entry table.
1174 PackageEntry* package =
1175 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1176
1177 // Return NULL if package does not exist or if no classes in that package
1178 // have been loaded.
1179 if (package != NULL && package->has_loaded_class()) {
1180 ModuleEntry* module = package->module();
1181 if (module->location() != NULL) {
1182 ResourceMark rm(THREAD);
1183 Handle ml = java_lang_String::create_from_str(
1184 module->location()->as_C_string(), THREAD);
1185 return ml();
1186 }
1187 // Return entry on boot loader class path.
1188 Handle cph = java_lang_String::create_from_str(
1189 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1190 return cph();
1191 }
1192 }
1193 return NULL;
1194 }
1195
1196 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1197 ResourceMark rm(THREAD);
1198 // List of pointers to PackageEntrys that have loaded classes.
1199 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
1200 {
1201 MutexLocker ml(Module_lock, THREAD);
1202
1203 PackageEntryTable* pe_table =
1204 ClassLoaderData::the_null_class_loader_data()->packages();
1205
1206 // Collect the packages that have at least one loaded class.
1207 for (int x = 0; x < pe_table->table_size(); x++) {
1208 for (PackageEntry* package_entry = pe_table->bucket(x);
1209 package_entry != NULL;
1210 package_entry = package_entry->next()) {
1211 if (package_entry->has_loaded_class()) {
1212 loaded_class_pkgs->append(package_entry);
1213 }
1214 }
1215 }
1216 }
1217
1218
1219 // Allocate objArray and fill with java.lang.String
1220 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1221 loaded_class_pkgs->length(), CHECK_NULL);
1222 objArrayHandle result(THREAD, r);
1223 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1224 PackageEntry* package_entry = loaded_class_pkgs->at(x);
1225 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1226 result->obj_at_put(x, str());
1227 }
1228 return result();
1229 }
1230
1231 #if INCLUDE_CDS
1232 s2 ClassLoader::module_to_classloader(const char* module_name) {
1233
1234 assert(DumpSharedSpaces, "dump time only");
1235 assert(_boot_modules_array != NULL, "_boot_modules_array is NULL");
1236 assert(_platform_modules_array != NULL, "_platform_modules_array is NULL");
1237
1238 int array_size = _boot_modules_array->length();
1239 for (int i = 0; i < array_size; i++) {
1240 if (strcmp(module_name, _boot_modules_array->at(i)) == 0) {
1241 return BOOT_LOADER;
1242 }
1243 }
1244
1245 array_size = _platform_modules_array->length();
1246 for (int i = 0; i < array_size; i++) {
1247 if (strcmp(module_name, _platform_modules_array->at(i)) == 0) {
1248 return PLATFORM_LOADER;
1249 }
1250 }
1251
1252 return APP_LOADER;
1253 }
1254
1255 s2 ClassLoader::classloader_type(Symbol* class_name, ClassPathEntry* e, int classpath_index, TRAPS) {
1256 assert(DumpSharedSpaces, "Only used for CDS dump time");
1257
1258 // obtain the classloader type based on the class name.
1259 // First obtain the package name based on the class name. Then obtain
1260 // the classloader type based on the package name from the jimage using
1261 // a jimage API. If the classloader type cannot be found from the
1262 // jimage, it is determined by the class path entry.
1263 jshort loader_type = ClassLoader::APP_LOADER;
1264 if (e->is_jrt()) {
1265 ResourceMark rm;
1266 TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK_0);
1267 if (pkg_name != NULL) {
1268 const char* pkg_name_C_string = (const char*)(pkg_name->as_C_string());
1269 ClassPathImageEntry* cpie = (ClassPathImageEntry*)e;
1270 JImageFile* jimage = cpie->jimage();
1271 char* module_name = (char*)(*JImagePackageToModule)(jimage, pkg_name_C_string);
1272 if (module_name != NULL) {
1273 loader_type = ClassLoader::module_to_classloader(module_name);
1274 }
1275 }
1276 } else if (ClassLoaderExt::is_boot_classpath(classpath_index)) {
1277 loader_type = ClassLoader::BOOT_LOADER;
1278 }
1279 return loader_type;
1280 }
1281 #endif
1282
1283 // caller needs ResourceMark
1284 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1285 int class_name_len) {
1286 assert(class_name != NULL, "invariant");
1287 assert((int)strlen(class_name) == class_name_len, "invariant");
1288
1289 static const char class_suffix[] = ".class";
1290
1291 char* const file_name = NEW_RESOURCE_ARRAY(char,
1292 class_name_len +
1293 sizeof(class_suffix)); // includes term NULL
1294
1295 strncpy(file_name, class_name, class_name_len);
1296 strncpy(&file_name[class_name_len], class_suffix, sizeof(class_suffix));
1297
1298 return file_name;
1299 }
1300
1301 instanceKlassHandle ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1302 assert(name != NULL, "invariant");
1303 assert(THREAD->is_Java_thread(), "must be a JavaThread");
1304
1305 ResourceMark rm(THREAD);
1306 HandleMark hm(THREAD);
1307
1308 const char* const class_name = name->as_C_string();
1309
1310 EventMark m("loading class %s", class_name);
1311 ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion);
1312
1313 const char* const file_name = file_name_for_class_name(class_name,
1314 name->utf8_length());
1315 assert(file_name != NULL, "invariant");
1316
1317 ClassLoaderExt::Context context(class_name, file_name, THREAD);
1318
1319 // Lookup stream for parsing .class file
1320 ClassFileStream* stream = NULL;
1321 s2 classpath_index = 0;
1322 ClassPathEntry* e = NULL;
1323
1324 // If DumpSharedSpaces is true, boot loader visibility boundaries are set
1325 // to be _first_entry to the end (all path entries). No --patch-module entries are
1326 // included since CDS and AppCDS are not supported if --patch-module is specified.
1327 //
1328 // If search_append_only is true, boot loader visibility boundaries are
1329 // set to be _first_append_entry to the end. This includes:
1330 // [-Xbootclasspath/a]; [jvmti appended entries]
1331 //
1332 // If both DumpSharedSpaces and search_append_only are false, boot loader
1333 // visibility boundaries are set to be _first_entry to the entry before
1334 // the _first_append_entry. This would include:
1335 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [exploded build | jimage]
1336 //
1337 // DumpSharedSpaces and search_append_only are mutually exclusive and cannot
1338 // be true at the same time.
1339 assert(!(DumpSharedSpaces && search_append_only), "DumpSharedSpaces and search_append_only are both true");
1340
1341 // Load Attempt #1: --patch-module
1342 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1343 // attempt to load the class from those locations specific to the module.
1344 // Note: The --patch-module entries are never searched if the boot loader's
1345 // visibility boundary is limited to only searching the append entries.
1346 if (_patch_mod_entries != NULL && !search_append_only && !DumpSharedSpaces) {
1347 // Find the module in the boot loader's module entry table
1348 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), THREAD);
1349 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL;
1350
1351 // If the module system has not defined java.base yet, then
1352 // classes loaded are assumed to be defined to java.base.
1353 // When java.base is eventually defined by the module system,
1354 // all packages of classes that have been previously loaded
1355 // are verified in ModuleEntryTable::verify_javabase_packages().
1356 if (!Universe::is_module_initialized() &&
1357 !ModuleEntryTable::javabase_defined() &&
1358 mod_entry == NULL) {
1359 mod_entry = ModuleEntryTable::javabase_module();
1360 }
1361
1362 // The module must be a named module
1363 if (mod_entry != NULL && mod_entry->is_named()) {
1364 int num_of_entries = _patch_mod_entries->length();
1365 const Symbol* class_module_name = mod_entry->name();
1366
1367 // Loop through all the patch_mod entries looking for module
1368 for (int i = 0; i < num_of_entries; i++) {
1369 ModuleClassPathList* module_cpl = _patch_mod_entries->at(i);
1370 Symbol* module_cpl_name = module_cpl->module_name();
1371
1372 if (module_cpl_name->fast_compare(class_module_name) == 0) {
1373 // Class' module has been located, attempt to load
1374 // the class from the module's ClassPathEntry list.
1375 e = module_cpl->module_first_entry();
1376 while (e != NULL) {
1377 stream = e->open_stream(file_name, CHECK_NULL);
1378 // No context.check is required since both CDS
1379 // and AppCDS are turned off if --patch-module is specified.
1380 if (NULL != stream) {
1381 break;
1382 }
1383 e = e->next();
1384 }
1385 // If the module was located in the patch_mod entries, break out
1386 // even if the class was not located successfully from that module's
1387 // ClassPathEntry list. There will not be another valid entry for
1388 // that module in the _patch_mod_entries array.
1389 break;
1390 }
1391 }
1392 }
1393 }
1394
1395 // Load Attempt #2: [exploded build | jimage]
1396 if (!search_append_only && (NULL == stream)) {
1397 e = _first_entry;
1398 while ((e != NULL) && (e != _first_append_entry)) {
1399 stream = e->open_stream(file_name, CHECK_NULL);
1400 if (!context.check(stream, classpath_index)) {
1401 return NULL;
1402 }
1403 if (NULL != stream) {
1404 break;
1405 }
1406 e = e->next();
1407 ++classpath_index;
1408 }
1409 }
1410
1411 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1412 if ((search_append_only || DumpSharedSpaces) && (NULL == stream)) {
1413 // For the boot loader append path search, must calculate
1414 // the starting classpath_index prior to attempting to
1415 // load the classfile.
1416 if (search_append_only) {
1417 ClassPathEntry *tmp_e = _first_entry;
1418 while ((tmp_e != NULL) && (tmp_e != _first_append_entry)) {
1419 tmp_e = tmp_e->next();
1420 ++classpath_index;
1421 }
1422 }
1423
1424 e = _first_append_entry;
1425 while (e != NULL) {
1426 stream = e->open_stream(file_name, CHECK_NULL);
1427 if (!context.check(stream, classpath_index)) {
1428 return NULL;
1429 }
1430 if (NULL != stream) {
1431 break;
1432 }
1433 e = e->next();
1434 ++classpath_index;
1435 }
1436 }
1437
1438 if (NULL == stream) {
1439 if (DumpSharedSpaces) {
1440 tty->print_cr("Preload Warning: Cannot find %s", class_name);
1441 }
1442 return NULL;
1443 }
1444
1445 stream->set_verify(context.should_verify(classpath_index));
1446
1447 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1448 Handle protection_domain;
1449
1450 instanceKlassHandle result = KlassFactory::create_from_stream(stream,
1451 name,
1452 loader_data,
1453 protection_domain,
1454 NULL, // host_klass
1455 NULL, // cp_patches
1456 NULL, // parsed_name
1457 THREAD);
1458 if (HAS_PENDING_EXCEPTION) {
1459 if (DumpSharedSpaces) {
1460 tty->print_cr("Preload Error: Failed to load %s", class_name);
1461 }
1462 return NULL;
1463 }
1464
1465 return context.record_result(name, e, classpath_index, result, THREAD);
1466 }
1467
1468 // Initialize the class loader's access to methods in libzip. Parse and
1469 // process the boot classpath into a list ClassPathEntry objects. Once
1470 // this list has been created, it must not change order (see class PackageInfo)
1471 // it can be appended to and is by jvmti and the kernel vm.
1472
1473 void ClassLoader::initialize() {
1474 EXCEPTION_MARK;
1475
1476 if (UsePerfData) {
1477 // jvmstat performance counters
1478 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1479 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1480 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1481 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1482 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1483 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1484 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1485 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1486 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1487 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1488
1489 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1490 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1491 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1492 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1493 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1494 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1495 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1496 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1497 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1498 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1499 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1500 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1501 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1502
1503
1504 // The following performance counters are added for measuring the impact
1505 // of the bug fix of 6365597. They are mainly focused on finding out
1506 // the behavior of system & user-defined classloader lock, whether
1507 // ClassLoader.loadClass/findClass is being called synchronized or not.
1508 // Also two additional counters are created to see whether 'UnsyncloadClass'
1509 // flag is being set or not and how many times load_instance_class call
1510 // fails with linkageError etc.
1511 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1512 "systemLoaderLockContentionRate");
1513 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1514 "nonSystemLoaderLockContentionRate");
1515 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1516 "jvmFindLoadedClassNoLockCalls");
1517 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1518 "jvmDefineClassNoLockCalls");
1519
1520 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1521 "jniDefineClassNoLockCalls");
1522
1523 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1524 "unsafeDefineClassCalls");
1525
1526 NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet");
1527 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1528 "loadInstanceClassFailRate");
1529
1530 // increment the isUnsyncloadClass counter if UnsyncloadClass is set.
1531 if (UnsyncloadClass) {
1532 _isUnsyncloadClass->inc();
1533 }
1534 }
1535
1536 // lookup zip library entry points
1537 load_zip_library();
1538 // lookup jimage library entry points
1539 load_jimage_library();
1540 #if INCLUDE_CDS
1541 // initialize search path
1542 if (DumpSharedSpaces) {
1543 _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
1544 }
1545 #endif
1546 setup_bootstrap_search_path();
1547 }
1548
1549 #if INCLUDE_CDS
1550 void ClassLoader::initialize_shared_path() {
1551 if (DumpSharedSpaces) {
1552 ClassLoaderExt::setup_search_paths();
1553 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1554 }
1555 }
1556 #endif
1557
1558 jlong ClassLoader::classloader_time_ms() {
1559 return UsePerfData ?
1560 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1561 }
1562
1563 jlong ClassLoader::class_init_count() {
1564 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1565 }
1566
1567 jlong ClassLoader::class_init_time_ms() {
1568 return UsePerfData ?
1569 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1570 }
1571
1572 jlong ClassLoader::class_verify_time_ms() {
1573 return UsePerfData ?
1574 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1575 }
1576
1577 jlong ClassLoader::class_link_count() {
1578 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1579 }
1580
1581 jlong ClassLoader::class_link_time_ms() {
1582 return UsePerfData ?
1583 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1584 }
1585
1586 int ClassLoader::compute_Object_vtable() {
1587 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1588 // code to determine actual value from file
1589 // Would be value '11' if finals were in vtable
1590 int JDK_1_2_Object_vtable_size = 5;
1591 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1592 }
1593
1594
1595 void classLoader_init1() {
1596 ClassLoader::initialize();
1597 }
1598
1599 // Complete the ClassPathEntry setup for the boot loader
1600 void classLoader_init2() {
1601 // Setup the list of module/path pairs for --patch-module processing
1602 // This must be done after the SymbolTable is created in order
1603 // to use fast_compare on module names instead of a string compare.
1604 if (Arguments::get_patch_mod_prefix() != NULL) {
1605 ClassLoader::setup_patch_mod_entries();
1606 }
1607
1608 // Determine if this is an exploded build
1609 ClassLoader::set_has_jimage();
1610 }
1611
1612
1613 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1614 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1615 if (CanonicalizeEntry != NULL) {
1616 JavaThread* THREAD = JavaThread::current();
1617 JNIEnv* env = THREAD->jni_environment();
1618 ResourceMark rm(THREAD);
1619
1620 // os::native_path writes into orig_copy
1621 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1622 strcpy(orig_copy, orig);
1623 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1624 return false;
1625 }
1626 } else {
1627 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1628 strncpy(out, orig, len);
1629 out[len - 1] = '\0';
1630 }
1631 return true;
1632 }
1633
1634 void ClassLoader::create_javabase() {
1635 Thread* THREAD = Thread::current();
1636
1637 // Create java.base's module entry for the boot
1638 // class loader prior to loading j.l.Ojbect.
1639 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1640
1641 // Get module entry table
1642 ModuleEntryTable* null_cld_modules = null_cld->modules();
1643 if (null_cld_modules == NULL) {
1644 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1645 }
1646
1647 {
1648 MutexLocker ml(Module_lock, THREAD);
1649 ModuleEntry* jb_module = null_cld_modules->locked_create_entry_or_null(Handle(NULL), vmSymbols::java_base(), NULL, NULL, null_cld);
1650 if (jb_module == NULL) {
1651 vm_exit_during_initialization("Unable to create ModuleEntry for java.base");
1652 }
1653 ModuleEntryTable::set_javabase_module(jb_module);
1654 }
1655 }
1656
1657 void ClassLoader::set_has_jimage() {
1658 // Determine if this is an exploded build. When looking for
1659 // the jimage file, only search the piece of the boot
1660 // loader's boot class path which contains [exploded build | jimage].
1661 // Do not search the boot loader's patch-module entries or append path.
1662 ClassPathEntry* e = _first_entry;
1663 ClassPathEntry* last_e = _first_append_entry;
1664 while ((e != NULL) && (e != last_e)) {
1665 JImageFile *jimage = e->jimage();
1666 if (jimage != NULL && e->is_jrt()) {
1667 _has_jimage = true;
1668 #if INCLUDE_CDS
1669 ClassLoader::initialize_module_loader_map(jimage);
1670 #endif
1671 return;
1672 }
1673 e = e->next();
1674 }
1675 }
1676
1677 #ifndef PRODUCT
1678
1679 // CompileTheWorld
1680 //
1681 // Iterates over all class path entries and forces compilation of all methods
1682 // in all classes found. Currently, only zip/jar archives are searched.
1683 //
1684 // The classes are loaded by the Java level bootstrap class loader, and the
1685 // initializer is called. If DelayCompilationDuringStartup is true (default),
1686 // the interpreter will run the initialization code. Note that forcing
1687 // initialization in this way could potentially lead to initialization order
1688 // problems, in which case we could just force the initialization bit to be set.
1689
1690
1691 // We need to iterate over the contents of a zip/jar file, so we replicate the
1692 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1693 // since jzfile already has a void* definition.
1694 //
1695 // Note that this is only used in debug mode.
1696 //
1697 // HotSpot integration note:
1698 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1699
1700
1701 // JDK 1.3 version
1702 typedef struct real_jzentry { /* Zip file entry */
1703 char *name; /* entry name */
1704 jint time; /* modification time */
1705 jint size; /* size of uncompressed data */
1706 jint csize; /* size of compressed data (zero if uncompressed) */
1707 jint crc; /* crc of uncompressed data */
1708 char *comment; /* optional zip file comment */
1709 jbyte *extra; /* optional extra data */
1710 jint pos; /* position of LOC header (if negative) or data */
1711 } real_jzentry;
1712
1713 typedef struct real_jzfile { /* Zip file */
1714 char *name; /* zip file name */
1715 jint refs; /* number of active references */
1716 jint fd; /* open file descriptor */
1717 void *lock; /* read lock */
1718 char *comment; /* zip file comment */
1719 char *msg; /* zip error message */
1720 void *entries; /* array of hash cells */
1721 jint total; /* total number of entries */
1722 unsigned short *table; /* Hash chain heads: indexes into entries */
1723 jint tablelen; /* number of hash eads */
1724 real_jzfile *next; /* next zip file in search list */
1725 jzentry *cache; /* we cache the most recently freed jzentry */
1726 /* Information on metadata names in META-INF directory */
1727 char **metanames; /* array of meta names (may have null names) */
1728 jint metacount; /* number of slots in metanames array */
1729 /* If there are any per-entry comments, they are in the comments array */
1730 char **comments;
1731 } real_jzfile;
1732
1733 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1734 // For now we only compile all methods in all classes in zip/jar files
1735 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1736 tty->cr();
1737 }
1738
1739 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1740 real_jzfile* zip = (real_jzfile*) _zip;
1741 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1742 tty->cr();
1743 // Iterate over all entries in zip file
1744 for (int n = 0; ; n++) {
1745 real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n));
1746 if (ze == NULL) break;
1747 ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1748 }
1749 if (HAS_PENDING_EXCEPTION) {
1750 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1751 CLEAR_PENDING_EXCEPTION;
1752 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1753 tty->print_cr("Increase class metadata storage if a limit was set");
1754 } else {
1755 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1756 }
1757 }
1758 }
1759
1760 void ClassLoader::compile_the_world() {
1761 EXCEPTION_MARK;
1762 HandleMark hm(THREAD);
1763 ResourceMark rm(THREAD);
1764
1765 // Find bootstrap loader
1766 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1767 // Iterate over all bootstrap class path entries
1768 ClassPathEntry* e = _first_entry;
1769 jlong start = os::javaTimeMillis();
1770 while (e != NULL) {
1771 // We stop at "modules" jimage, unless it is the first bootstrap path entry
1772 if (e->is_jrt() && e != _first_entry) break;
1773 e->compile_the_world(system_class_loader, CATCH);
1774 e = e->next();
1775 }
1776 jlong end = os::javaTimeMillis();
1777 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1778 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1779 {
1780 // Print statistics as if before normal exit:
1781 extern void print_statistics();
1782 print_statistics();
1783 }
1784 vm_exit(0);
1785 }
1786
1787 int ClassLoader::_compile_the_world_class_counter = 0;
1788 int ClassLoader::_compile_the_world_method_counter = 0;
1789 static int _codecache_sweep_counter = 0;
1790
1791 // Filter out all exceptions except OOMs
1792 static void clear_pending_exception_if_not_oom(TRAPS) {
1793 if (HAS_PENDING_EXCEPTION &&
1794 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1795 CLEAR_PENDING_EXCEPTION;
1796 }
1797 // The CHECK at the caller will propagate the exception out
1798 }
1799
1800 /**
1801 * Returns if the given method should be compiled when doing compile-the-world.
1802 *
1803 * TODO: This should be a private method in a CompileTheWorld class.
1804 */
1805 static bool can_be_compiled(methodHandle m, int comp_level) {
1806 assert(CompileTheWorld, "must be");
1807
1808 // It's not valid to compile a native wrapper for MethodHandle methods
1809 // that take a MemberName appendix since the bytecode signature is not
1810 // correct.
1811 vmIntrinsics::ID iid = m->intrinsic_id();
1812 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1813 return false;
1814 }
1815
1816 return CompilationPolicy::can_be_compiled(m, comp_level);
1817 }
1818
1819 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1820 if (string_ends_with(name, ".class")) {
1821 // We have a .class file
1822 int len = (int)strlen(name);
1823 char buffer[2048];
1824 strncpy(buffer, name, len - 6);
1825 buffer[len-6] = 0;
1826 // If the file has a period after removing .class, it's not really a
1827 // valid class file. The class loader will check everything else.
1828 if (strchr(buffer, '.') == NULL) {
1829 _compile_the_world_class_counter++;
1830 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
1831
1832 // Construct name without extension
1833 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
1834 // Use loader to load and initialize class
1835 Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
1836 instanceKlassHandle k (THREAD, ik);
1837 if (k.not_null() && !HAS_PENDING_EXCEPTION) {
1838 k->initialize(THREAD);
1839 }
1840 bool exception_occurred = HAS_PENDING_EXCEPTION;
1841 clear_pending_exception_if_not_oom(CHECK);
1842 if (CompileTheWorldPreloadClasses && k.not_null()) {
1843 ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD);
1844 if (HAS_PENDING_EXCEPTION) {
1845 // If something went wrong in preloading we just ignore it
1846 clear_pending_exception_if_not_oom(CHECK);
1847 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
1848 }
1849 }
1850
1851 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
1852 if (k.is_null() || exception_occurred) {
1853 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
1854 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
1855 } else {
1856 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
1857 // Preload all classes to get around uncommon traps
1858 // Iterate over all methods in class
1859 int comp_level = CompilationPolicy::policy()->initial_compile_level();
1860 for (int n = 0; n < k->methods()->length(); n++) {
1861 methodHandle m (THREAD, k->methods()->at(n));
1862 if (can_be_compiled(m, comp_level)) {
1863 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
1864 // Give sweeper a chance to keep up with CTW
1865 VM_ForceSafepoint op;
1866 VMThread::execute(&op);
1867 _codecache_sweep_counter = 0;
1868 }
1869 // Force compilation
1870 CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
1871 methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
1872 if (HAS_PENDING_EXCEPTION) {
1873 clear_pending_exception_if_not_oom(CHECK);
1874 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1875 } else {
1876 _compile_the_world_method_counter++;
1877 }
1878 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
1879 // Clobber the first compile and force second tier compilation
1880 CompiledMethod* nm = m->code();
1881 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1882 // Throw out the code so that the code cache doesn't fill up
1883 nm->make_not_entrant();
1884 m->clear_code();
1885 }
1886 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
1887 methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
1888 if (HAS_PENDING_EXCEPTION) {
1889 clear_pending_exception_if_not_oom(CHECK);
1890 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1891 } else {
1892 _compile_the_world_method_counter++;
1893 }
1894 }
1895 } else {
1896 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1897 }
1898
1899 CompiledMethod* nm = m->code();
1900 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1901 // Throw out the code so that the code cache doesn't fill up
1902 nm->make_not_entrant();
1903 m->clear_code();
1904 }
1905 }
1906 }
1907 }
1908 }
1909 }
1910 }
1911
1912 #endif //PRODUCT
1913
1914 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1915 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1916 void PerfClassTraceTime::initialize() {
1917 if (!UsePerfData) return;
1918
1919 if (_eventp != NULL) {
1920 // increment the event counter
1921 _eventp->inc();
1922 }
1923
1924 // stop the current active thread-local timer to measure inclusive time
1925 _prev_active_event = -1;
1926 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1927 if (_timers[i].is_active()) {
1928 assert(_prev_active_event == -1, "should have only one active timer");
1929 _prev_active_event = i;
1930 _timers[i].stop();
1931 }
1932 }
1933
1934 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1935 // start the inclusive timer if not recursively called
1936 _t.start();
1937 }
1938
1939 // start thread-local timer of the given event type
1940 if (!_timers[_event_type].is_active()) {
1941 _timers[_event_type].start();
1942 }
1943 }
1944
1945 PerfClassTraceTime::~PerfClassTraceTime() {
1946 if (!UsePerfData) return;
1947
1948 // stop the thread-local timer as the event completes
1949 // and resume the thread-local timer of the event next on the stack
1950 _timers[_event_type].stop();
1951 jlong selftime = _timers[_event_type].ticks();
1952
1953 if (_prev_active_event >= 0) {
1954 _timers[_prev_active_event].start();
1955 }
1956
1957 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1958
1959 // increment the counters only on the leaf call
1960 _t.stop();
1961 _timep->inc(_t.ticks());
1962 if (_selftimep != NULL) {
1963 _selftimep->inc(selftime);
1964 }
1965 // add all class loading related event selftime to the accumulated time counter
1966 ClassLoader::perf_accumulated_time()->inc(selftime);
1967
1968 // reset the timer
1969 _timers[_event_type].reset();
1970 }