1 /*
2 * Copyright (c) 1997, 2017, 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 jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n);
85 typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg);
86 typedef jint (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len);
87
88 static ZipOpen_t ZipOpen = NULL;
89 static ZipClose_t ZipClose = NULL;
90 static FindEntry_t FindEntry = NULL;
91 static ReadEntry_t ReadEntry = NULL;
92 static GetNextEntry_t GetNextEntry = NULL;
93 static canonicalize_fn_t CanonicalizeEntry = NULL;
94 static ZipInflateFully_t ZipInflateFully = NULL;
95 static Crc32_t Crc32 = NULL;
96
97 // Entry points for jimage.dll for loading jimage file entries
98
99 static JImageOpen_t JImageOpen = NULL;
100 static JImageClose_t JImageClose = NULL;
101 static JImagePackageToModule_t JImagePackageToModule = NULL;
102 static JImageFindResource_t JImageFindResource = NULL;
103 static JImageGetResource_t JImageGetResource = NULL;
104 static JImageResourceIterator_t JImageResourceIterator = NULL;
105 static JImage_ResourcePath_t JImageResourcePath = NULL;
106
107 // Globals
108
109 PerfCounter* ClassLoader::_perf_accumulated_time = NULL;
110 PerfCounter* ClassLoader::_perf_classes_inited = NULL;
111 PerfCounter* ClassLoader::_perf_class_init_time = NULL;
112 PerfCounter* ClassLoader::_perf_class_init_selftime = NULL;
113 PerfCounter* ClassLoader::_perf_classes_verified = NULL;
114 PerfCounter* ClassLoader::_perf_class_verify_time = NULL;
115 PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL;
116 PerfCounter* ClassLoader::_perf_classes_linked = NULL;
117 PerfCounter* ClassLoader::_perf_class_link_time = NULL;
118 PerfCounter* ClassLoader::_perf_class_link_selftime = NULL;
119 PerfCounter* ClassLoader::_perf_class_parse_time = NULL;
120 PerfCounter* ClassLoader::_perf_class_parse_selftime = NULL;
121 PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL;
122 PerfCounter* ClassLoader::_perf_shared_classload_time = NULL;
123 PerfCounter* ClassLoader::_perf_sys_classload_time = NULL;
124 PerfCounter* ClassLoader::_perf_app_classload_time = NULL;
125 PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL;
126 PerfCounter* ClassLoader::_perf_app_classload_count = NULL;
127 PerfCounter* ClassLoader::_perf_define_appclasses = NULL;
128 PerfCounter* ClassLoader::_perf_define_appclass_time = NULL;
129 PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL;
130 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL;
131 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL;
132 PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
133 PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
134 PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
135 PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
136 PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
137 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL;
138 PerfCounter* ClassLoader::_isUnsyncloadClass = NULL;
139 PerfCounter* ClassLoader::_load_instance_class_failCounter = NULL;
140
141 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = NULL;
142 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = NULL;
143 ClassPathEntry* ClassLoader::_jrt_entry = NULL;
144 ClassPathEntry* ClassLoader::_first_append_entry = NULL;
145 ClassPathEntry* ClassLoader::_last_append_entry = NULL;
146 int ClassLoader::_num_entries = 0;
147 #if INCLUDE_CDS
148 GrowableArray<char*>* ClassLoader::_boot_modules_array = NULL;
149 GrowableArray<char*>* ClassLoader::_platform_modules_array = NULL;
150 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL;
151 #endif
152
153 // helper routines
154 bool string_starts_with(const char* str, const char* str_to_find) {
155 size_t str_len = strlen(str);
156 size_t str_to_find_len = strlen(str_to_find);
157 if (str_to_find_len > str_len) {
158 return false;
159 }
160 return (strncmp(str, str_to_find, str_to_find_len) == 0);
161 }
162
163 static const char* get_jimage_version_string() {
164 static char version_string[10] = "";
165 if (version_string[0] == '\0') {
166 jio_snprintf(version_string, sizeof(version_string), "%d.%d",
167 Abstract_VM_Version::vm_major_version(), Abstract_VM_Version::vm_minor_version());
168 }
169 return (const char*)version_string;
170 }
171
172 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) {
173 size_t str_len = strlen(str);
174 size_t str_to_find_len = strlen(str_to_find);
175 if (str_to_find_len > str_len) {
176 return false;
177 }
178 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
179 }
180
181 // Used to obtain the package name from a fully qualified class name.
182 // It is the responsibility of the caller to establish a ResourceMark.
183 const char* ClassLoader::package_from_name(const char* const class_name, bool* bad_class_name) {
184 if (class_name == NULL) {
185 if (bad_class_name != NULL) {
186 *bad_class_name = true;
187 }
188 return NULL;
189 }
190
191 if (bad_class_name != NULL) {
192 *bad_class_name = false;
193 }
194
195 const char* const last_slash = strrchr(class_name, '/');
196 if (last_slash == NULL) {
197 // No package name
198 return NULL;
199 }
200
201 char* class_name_ptr = (char*) class_name;
202 // Skip over '['s
203 if (*class_name_ptr == '[') {
204 do {
205 class_name_ptr++;
206 } while (*class_name_ptr == '[');
207
208 // Fully qualified class names should not contain a 'L'.
209 // Set bad_class_name to true to indicate that the package name
210 // could not be obtained due to an error condition.
211 // In this situation, is_same_class_package returns false.
212 if (*class_name_ptr == 'L') {
213 if (bad_class_name != NULL) {
214 *bad_class_name = true;
215 }
216 return NULL;
217 }
218 }
219
220 int length = last_slash - class_name_ptr;
221
222 // A class name could have just the slash character in the name.
223 if (length <= 0) {
224 // No package name
225 if (bad_class_name != NULL) {
226 *bad_class_name = true;
227 }
228 return NULL;
229 }
230
231 // drop name after last slash (including slash)
232 // Ex., "java/lang/String.class" => "java/lang"
233 char* pkg_name = NEW_RESOURCE_ARRAY(char, length + 1);
234 strncpy(pkg_name, class_name_ptr, length);
235 *(pkg_name+length) = '\0';
236
237 return (const char *)pkg_name;
238 }
239
240 // Given a fully qualified class name, find its defining package in the class loader's
241 // package entry table.
242 static PackageEntry* get_package_entry(const char* class_name, ClassLoaderData* loader_data, TRAPS) {
243 ResourceMark rm(THREAD);
244 const char *pkg_name = ClassLoader::package_from_name(class_name);
245 if (pkg_name == NULL) {
246 return NULL;
247 }
248 PackageEntryTable* pkgEntryTable = loader_data->packages();
249 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(pkg_name, CHECK_NULL);
250 return pkgEntryTable->lookup_only(pkg_symbol);
251 }
252
253 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() {
254 char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
255 strcpy(copy, dir);
256 _dir = copy;
257 }
258
259
260 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
261 // construct full path name
262 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
263 if (jio_snprintf(path, JVM_MAXPATHLEN, "%s%s%s", _dir, os::file_separator(), name) == -1) {
264 FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN);
265 return NULL;
266 }
267 // check if file exists
268 struct stat st;
269 if (os::stat(path, &st) == 0) {
270 #if INCLUDE_CDS
271 if (DumpSharedSpaces) {
272 // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so
273 // we should never find a file underneath it -- unless user has added a new file while we are running
274 // the dump, in which case let's quit!
275 ShouldNotReachHere();
276 }
277 #endif
278 // found file, open it
279 int file_handle = os::open(path, 0, 0);
280 if (file_handle != -1) {
281 // read contents into resource array
282 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
283 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
284 // close file
285 os::close(file_handle);
286 // construct ClassFileStream
287 if (num_read == (size_t)st.st_size) {
288 if (UsePerfData) {
289 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
290 }
291 FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN);
292 // Resource allocated
293 return new ClassFileStream(buffer,
294 st.st_size,
295 _dir,
296 ClassFileStream::verify);
297 }
298 }
299 }
300 FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN);
301 return NULL;
302 }
303
304 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name, bool is_boot_append) : ClassPathEntry() {
305 _zip = zip;
306 char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
307 strcpy(copy, zip_name);
308 _zip_name = copy;
309 _is_boot_append = is_boot_append;
310 _multi_versioned = _unknown;
311 }
312
313 ClassPathZipEntry::~ClassPathZipEntry() {
314 if (ZipClose != NULL) {
315 (*ZipClose)(_zip);
316 }
317 FREE_C_HEAP_ARRAY(char, _zip_name);
318 }
319
320 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
321 // enable call to C land
322 JavaThread* thread = JavaThread::current();
323 ThreadToNativeFromVM ttn(thread);
324 // check whether zip archive contains name
325 jint name_len;
326 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
327 if (entry == NULL) return NULL;
328 u1* buffer;
329 char name_buf[128];
330 char* filename;
331 if (name_len < 128) {
332 filename = name_buf;
333 } else {
334 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
335 }
336
337 // read contents into resource array
338 int size = (*filesize) + ((nul_terminate) ? 1 : 0);
339 buffer = NEW_RESOURCE_ARRAY(u1, size);
340 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
341
342 // return result
343 if (nul_terminate) {
344 buffer[*filesize] = 0;
345 }
346 return buffer;
347 }
348
349 #if INCLUDE_CDS
350 u1* ClassPathZipEntry::open_versioned_entry(const char* name, jint* filesize, TRAPS) {
351 u1* buffer = NULL;
352 if (DumpSharedSpaces && !_is_boot_append) {
353 // We presume default is multi-release enabled
354 const char* multi_ver = Arguments::get_property("jdk.util.jar.enableMultiRelease");
355 const char* verstr = Arguments::get_property("jdk.util.jar.version");
356 bool is_multi_ver = (multi_ver == NULL ||
357 strcmp(multi_ver, "true") == 0 ||
358 strcmp(multi_ver, "force") == 0) &&
359 is_multiple_versioned(THREAD);
360 // command line version setting
361 int version = 0;
362 const int base_version = 8; // JDK8
363 int cur_ver = JDK_Version::current().major_version();
364 if (verstr != NULL) {
365 version = atoi(verstr);
366 if (version < base_version || version > cur_ver) {
367 // If the specified version is lower than the base version, the base
368 // entry will be used; if the version is higher than the current
369 // jdk version, the highest versioned entry will be used.
370 if (version < base_version) {
371 is_multi_ver = false;
372 }
373 // print out warning, do not use assertion here since it will continue to look
374 // for proper version.
375 warning("JDK%d is not supported in multiple version jars", version);
376 }
377 }
378
379 if (is_multi_ver) {
380 int n;
381 char* entry_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
382 if (version > 0) {
383 n = jio_snprintf(entry_name, JVM_MAXPATHLEN, "META-INF/versions/%d/%s", version, name);
384 entry_name[n] = '\0';
385 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
386 if (buffer == NULL) {
387 warning("Could not find %s in %s, try to find highest version instead", entry_name, _zip_name);
388 }
389 }
390 if (buffer == NULL) {
391 for (int i = cur_ver; i >= base_version; i--) {
392 n = jio_snprintf(entry_name, JVM_MAXPATHLEN, "META-INF/versions/%d/%s", i, name);
393 entry_name[n] = '\0';
394 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
395 if (buffer != NULL) {
396 break;
397 }
398 }
399 }
400 FREE_RESOURCE_ARRAY(char, entry_name, JVM_MAXPATHLEN);
401 }
402 }
403 return buffer;
404 }
405
406 bool ClassPathZipEntry::is_multiple_versioned(TRAPS) {
407 assert(DumpSharedSpaces, "called only at dump time");
408 if (_multi_versioned != _unknown) {
409 return (_multi_versioned == _yes) ? true : false;
410 }
411 jint size;
412 char* buffer = (char*)open_entry("META-INF/MANIFEST.MF", &size, true, CHECK_false);
413 if (buffer != NULL) {
414 char* p = buffer;
415 for ( ; *p; ++p) *p = tolower(*p);
416 if (strstr(buffer, "multi-release: true") != NULL) {
417 _multi_versioned = _yes;
418 return true;
419 }
420 }
421 _multi_versioned = _no;
422 return false;
423 }
424 #endif // INCLUDE_CDS
425
426 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
427 jint filesize;
428 u1* buffer = open_versioned_entry(name, &filesize, CHECK_NULL);
429 if (buffer == NULL) {
430 buffer = open_entry(name, &filesize, false, CHECK_NULL);
431 if (buffer == NULL) {
432 return NULL;
433 }
434 }
435 if (UsePerfData) {
436 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
437 }
438 // Resource allocated
439 return new ClassFileStream(buffer,
440 filesize,
441 _zip_name,
442 ClassFileStream::verify);
443 }
444
445 // invoke function for each entry in the zip file
446 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
447 JavaThread* thread = JavaThread::current();
448 HandleMark handle_mark(thread);
449 ThreadToNativeFromVM ttn(thread);
450 for (int n = 0; ; n++) {
451 jzentry * ze = ((*GetNextEntry)(_zip, n));
452 if (ze == NULL) break;
453 (*f)(ze->name, context);
454 }
455 }
456
457 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
458 ClassPathEntry(),
459 _jimage(jimage) {
460 guarantee(jimage != NULL, "jimage file is null");
461 guarantee(name != NULL, "jimage file name is null");
462 size_t len = strlen(name) + 1;
463 _name = NEW_C_HEAP_ARRAY(const char, len, mtClass);
464 strncpy((char *)_name, name, len);
465 }
466
467 ClassPathImageEntry::~ClassPathImageEntry() {
468 if (_name != NULL) {
469 FREE_C_HEAP_ARRAY(const char, _name);
470 _name = NULL;
471 }
472 if (_jimage != NULL) {
473 (*JImageClose)(_jimage);
474 _jimage = NULL;
475 }
476 }
477
478 // For a class in a named module, look it up in the jimage file using this syntax:
479 // /<module-name>/<package-name>/<base-class>
480 //
481 // Assumptions:
482 // 1. There are no unnamed modules in the jimage file.
483 // 2. A package is in at most one module in the jimage file.
484 //
485 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
486 jlong size;
487 JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size);
488
489 if (location == 0) {
490 ResourceMark rm;
491 const char* pkg_name = ClassLoader::package_from_name(name);
492
493 if (pkg_name != NULL) {
494 if (!Universe::is_module_initialized()) {
495 location = (*JImageFindResource)(_jimage, JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
496 #if INCLUDE_CDS
497 // CDS uses the boot class loader to load classes whose packages are in
498 // modules defined for other class loaders. So, for now, get their module
499 // names from the "modules" jimage file.
500 if (DumpSharedSpaces && location == 0) {
501 const char* module_name = (*JImagePackageToModule)(_jimage, pkg_name);
502 if (module_name != NULL) {
503 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
504 }
505 }
506 #endif
507
508 } else {
509 PackageEntry* package_entry = get_package_entry(name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
510 if (package_entry != NULL) {
511 ResourceMark rm;
512 // Get the module name
513 ModuleEntry* module = package_entry->module();
514 assert(module != NULL, "Boot classLoader package missing module");
515 assert(module->is_named(), "Boot classLoader package is in unnamed module");
516 const char* module_name = module->name()->as_C_string();
517 if (module_name != NULL) {
518 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
519 }
520 }
521 }
522 }
523 }
524 if (location != 0) {
525 if (UsePerfData) {
526 ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
527 }
528 char* data = NEW_RESOURCE_ARRAY(char, size);
529 (*JImageGetResource)(_jimage, location, data, size);
530 // Resource allocated
531 return new ClassFileStream((u1*)data,
532 (int)size,
533 _name,
534 ClassFileStream::verify);
535 }
536
537 return NULL;
538 }
539
540 #ifndef PRODUCT
541 bool ctw_visitor(JImageFile* jimage,
542 const char* module_name, const char* version, const char* package,
543 const char* name, const char* extension, void* arg) {
544 if (strcmp(extension, "class") == 0) {
545 Thread* THREAD = Thread::current();
546 ResourceMark rm(THREAD);
547 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JIMAGE_MAX_PATH);
548 jio_snprintf(path, JIMAGE_MAX_PATH - 1, "%s/%s.class", package, name);
549 ClassLoader::compile_the_world_in(path, *(Handle*)arg, THREAD);
550 return !HAS_PENDING_EXCEPTION;
551 }
552 return true;
553 }
554
555 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) {
556 tty->print_cr("CompileTheWorld : Compiling all classes in %s", name());
557 tty->cr();
558 (*JImageResourceIterator)(_jimage, (JImageResourceVisitor_t)ctw_visitor, (void *)&loader);
559 if (HAS_PENDING_EXCEPTION) {
560 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
561 CLEAR_PENDING_EXCEPTION;
562 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
563 tty->print_cr("Increase class metadata storage if a limit was set");
564 } else {
565 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
566 }
567 }
568 }
569 #endif
570
571 bool ClassPathImageEntry::is_jrt() {
572 return ClassLoader::is_jrt(name());
573 }
574
575 #if INCLUDE_CDS
576 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
577 assert(DumpSharedSpaces, "only called at dump time");
578 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure");
579 vm_exit_during_initialization(error, message);
580 }
581 #endif
582
583 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
584 _module_name = module_name;
585 _module_first_entry = NULL;
586 _module_last_entry = NULL;
587 }
588
589 ModuleClassPathList::~ModuleClassPathList() {
590 // Clean out each ClassPathEntry on list
591 ClassPathEntry* e = _module_first_entry;
592 while (e != NULL) {
593 ClassPathEntry* next_entry = e->next();
594 delete e;
595 e = next_entry;
596 }
597 }
598
599 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
600 if (new_entry != NULL) {
601 if (_module_last_entry == NULL) {
602 _module_first_entry = _module_last_entry = new_entry;
603 } else {
604 _module_last_entry->set_next(new_entry);
605 _module_last_entry = new_entry;
606 }
607 }
608 }
609
610 void ClassLoader::trace_class_path(const char* msg, const char* name) {
611 if (log_is_enabled(Info, class, path)) {
612 ResourceMark rm;
613 outputStream* out = Log(class, path)::info_stream();
614 if (msg) {
615 out->print("%s", msg);
616 }
617 if (name) {
618 if (strlen(name) < 256) {
619 out->print("%s", name);
620 } else {
621 // For very long paths, we need to print each character separately,
622 // as print_cr() has a length limit
623 while (name[0] != '\0') {
624 out->print("%c", name[0]);
625 name++;
626 }
627 }
628 }
629 out->cr();
630 }
631 }
632
633 #if INCLUDE_CDS
634 void ClassLoader::check_shared_classpath(const char *path) {
635 if (strcmp(path, "") == 0) {
636 exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
637 }
638
639 struct stat st;
640 if (os::stat(path, &st) == 0) {
641 if ((st.st_mode & S_IFMT) != S_IFREG) { // is not a regular file
642 if (!os::dir_is_empty(path)) {
643 tty->print_cr("Error: non-empty directory '%s'", path);
644 exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL);
645 }
646 }
647 }
648 }
649 #endif
650
651 void ClassLoader::setup_bootstrap_search_path() {
652 const char* sys_class_path = Arguments::get_sysclasspath();
653 const char* java_class_path = Arguments::get_appclasspath();
654 if (PrintSharedArchiveAndExit) {
655 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
656 // the same as the bootcp of the shared archive.
657 } else {
658 trace_class_path("bootstrap loader class path=", sys_class_path);
659 trace_class_path("classpath: ", java_class_path);
660 }
661 #if INCLUDE_CDS
662 if (DumpSharedSpaces) {
663 _shared_paths_misc_info->add_boot_classpath(sys_class_path);
664 }
665 #endif
666 setup_search_path(sys_class_path, true);
667 }
668
669 #if INCLUDE_CDS
670 int ClassLoader::get_shared_paths_misc_info_size() {
671 return _shared_paths_misc_info->get_used_bytes();
672 }
673
674 void* ClassLoader::get_shared_paths_misc_info() {
675 return _shared_paths_misc_info->buffer();
676 }
677
678 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
679 SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
680 bool result = checker->check();
681 delete checker;
682 return result;
683 }
684 #endif
685
686 // Construct the array of module/path pairs as specified to --patch-module
687 // for the boot loader to search ahead of the jimage, if the class being
688 // loaded is defined to a module that has been specified to --patch-module.
689 void ClassLoader::setup_patch_mod_entries() {
690 Thread* THREAD = Thread::current();
691 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
692 int num_of_entries = patch_mod_args->length();
693
694
695 // Set up the boot loader's _patch_mod_entries list
696 _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true);
697
698 for (int i = 0; i < num_of_entries; i++) {
699 const char* module_name = (patch_mod_args->at(i))->module_name();
700 Symbol* const module_sym = SymbolTable::lookup(module_name, (int)strlen(module_name), CHECK);
701 assert(module_sym != NULL, "Failed to obtain Symbol for module name");
702 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
703
704 char* class_path = (patch_mod_args->at(i))->path_string();
705 int len = (int)strlen(class_path);
706 int end = 0;
707 // Iterate over the module's class path entries
708 for (int start = 0; start < len; start = end) {
709 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
710 end++;
711 }
712 EXCEPTION_MARK;
713 ResourceMark rm(THREAD);
714 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
715 strncpy(path, &class_path[start], end - start);
716 path[end - start] = '\0';
717
718 struct stat st;
719 if (os::stat(path, &st) == 0) {
720 // File or directory found
721 Thread* THREAD = Thread::current();
722 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
723 // If the path specification is valid, enter it into this module's list
724 if (new_entry != NULL) {
725 module_cpl->add_to_list(new_entry);
726 }
727 }
728
729 while (class_path[end] == os::path_separator()[0]) {
730 end++;
731 }
732 }
733
734 // Record the module into the list of --patch-module entries only if
735 // valid ClassPathEntrys have been created
736 if (module_cpl->module_first_entry() != NULL) {
737 _patch_mod_entries->push(module_cpl);
738 }
739 }
740 }
741
742 // Determine whether the module has been patched via the command-line
743 // option --patch-module
744 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
745 if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) {
746 int table_len = _patch_mod_entries->length();
747 for (int i = 0; i < table_len; i++) {
748 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
749 if (module_name->fast_compare(patch_mod->module_name()) == 0) {
750 return true;
751 }
752 }
753 }
754 return false;
755 }
756
757 void ClassLoader::setup_search_path(const char *class_path, bool bootstrap_search) {
758 int len = (int)strlen(class_path);
759 int end = 0;
760 bool set_base_piece = bootstrap_search;
761
762 // Iterate over class path entries
763 for (int start = 0; start < len; start = end) {
764 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
765 end++;
766 }
767 EXCEPTION_MARK;
768 ResourceMark rm(THREAD);
769 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
770 strncpy(path, &class_path[start], end - start);
771 path[end - start] = '\0';
772
773 // The first time through the bootstrap_search setup, it must be determined
774 // what the base or core piece of the boot loader search is. Either a java runtime
775 // image is present or this is an exploded module build situation.
776 if (set_base_piece) {
777 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
778 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
779 struct stat st;
780 if (os::stat(path, &st) == 0) {
781 // Directory found
782 Thread* THREAD = Thread::current();
783 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
784
785 // Check for a jimage
786 if (Arguments::has_jimage()) {
787 assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice");
788 assert(new_entry != NULL && new_entry->is_jrt(), "No java runtime image present");
789 _jrt_entry = new_entry;
790 ++_num_entries;
791 #if INCLUDE_CDS
792 if (DumpSharedSpaces) {
793 JImageFile *jimage = _jrt_entry->jimage();
794 assert(jimage != NULL, "No java runtime image file present");
795 ClassLoader::initialize_module_loader_map(jimage);
796 }
797 #endif
798 }
799 } else {
800 // If path does not exist, exit
801 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
802 }
803 set_base_piece = false;
804 } else {
805 // Every entry on the system boot class path after the initial base piece,
806 // which is set by os::set_boot_path(), is considered an appended entry.
807 update_class_path_entry_list(path, false, bootstrap_search);
808 }
809
810 #if INCLUDE_CDS
811 if (DumpSharedSpaces) {
812 check_shared_classpath(path);
813 }
814 #endif
815 while (class_path[end] == os::path_separator()[0]) {
816 end++;
817 }
818 }
819 }
820
821 // During an exploded modules build, each module defined to the boot loader
822 // will be added to the ClassLoader::_exploded_entries array.
823 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) {
824 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
825 assert(_exploded_entries != NULL, "_exploded_entries was not initialized");
826
827 // Find the module's symbol
828 ResourceMark rm(THREAD);
829 const char *module_name = module_sym->as_C_string();
830 const char *home = Arguments::get_java_home();
831 const char file_sep = os::file_separator()[0];
832 // 10 represents the length of "modules" + 2 file separators + \0
833 size_t len = strlen(home) + strlen(module_name) + 10;
834 char *path = NEW_C_HEAP_ARRAY(char, len, mtModule);
835 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
836
837 struct stat st;
838 if (os::stat(path, &st) == 0) {
839 // Directory found
840 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
841
842 // If the path specification is valid, enter it into this module's list.
843 // There is no need to check for duplicate modules in the exploded entry list,
844 // since no two modules with the same name can be defined to the boot loader.
845 // This is checked at module definition time in Modules::define_module.
846 if (new_entry != NULL) {
847 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
848 module_cpl->add_to_list(new_entry);
849 {
850 MutexLocker ml(Module_lock, THREAD);
851 _exploded_entries->push(module_cpl);
852 }
853 log_info(class, load)("path: %s", path);
854 }
855 }
856 FREE_C_HEAP_ARRAY(char, path);
857 }
858
859 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
860 bool throw_exception,
861 bool is_boot_append, TRAPS) {
862 JavaThread* thread = JavaThread::current();
863 ClassPathEntry* new_entry = NULL;
864 if ((st->st_mode & S_IFMT) == S_IFREG) {
865 ResourceMark rm(thread);
866 // Regular file, should be a zip or jimage file
867 // Canonicalized filename
868 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
869 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
870 // This matches the classic VM
871 if (throw_exception) {
872 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
873 } else {
874 return NULL;
875 }
876 }
877 jint error;
878 JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
879 if (jimage != NULL) {
880 new_entry = new ClassPathImageEntry(jimage, canonical_path);
881 } else {
882 char* error_msg = NULL;
883 jzfile* zip;
884 {
885 // enable call to C land
886 ThreadToNativeFromVM ttn(thread);
887 HandleMark hm(thread);
888 zip = (*ZipOpen)(canonical_path, &error_msg);
889 }
890 if (zip != NULL && error_msg == NULL) {
891 new_entry = new ClassPathZipEntry(zip, path, is_boot_append);
892 } else {
893 char *msg;
894 if (error_msg == NULL) {
895 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ;
896 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
897 } else {
898 int len = (int)(strlen(path) + strlen(error_msg) + 128);
899 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ;
900 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
901 }
902 // Don't complain about bad jar files added via -Xbootclasspath/a:.
903 if (throw_exception && is_init_completed()) {
904 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
905 } else {
906 return NULL;
907 }
908 }
909 }
910 log_info(class, path)("opened: %s", path);
911 log_info(class, load)("opened: %s", path);
912 } else {
913 // Directory
914 new_entry = new ClassPathDirEntry(path);
915 log_info(class, load)("path: %s", path);
916 }
917 return new_entry;
918 }
919
920
921 // Create a class path zip entry for a given path (return NULL if not found
922 // or zip/JAR file cannot be opened)
923 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
924 // check for a regular file
925 struct stat st;
926 if (os::stat(path, &st) == 0) {
927 if ((st.st_mode & S_IFMT) == S_IFREG) {
928 char canonical_path[JVM_MAXPATHLEN];
929 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
930 char* error_msg = NULL;
931 jzfile* zip;
932 {
933 // enable call to C land
934 JavaThread* thread = JavaThread::current();
935 ThreadToNativeFromVM ttn(thread);
936 HandleMark hm(thread);
937 zip = (*ZipOpen)(canonical_path, &error_msg);
938 }
939 if (zip != NULL && error_msg == NULL) {
940 // create using canonical path
941 return new ClassPathZipEntry(zip, canonical_path, is_boot_append);
942 }
943 }
944 }
945 }
946 return NULL;
947 }
948
949 // returns true if entry already on class path
950 bool ClassLoader::contains_append_entry(const char* name) {
951 ClassPathEntry* e = _first_append_entry;
952 while (e != NULL) {
953 // assume zip entries have been canonicalized
954 if (strcmp(name, e->name()) == 0) {
955 return true;
956 }
957 e = e->next();
958 }
959 return false;
960 }
961
962 void ClassLoader::add_to_list(ClassPathEntry *new_entry) {
963 if (new_entry != NULL) {
964 if (_last_append_entry == NULL) {
965 assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty");
966 _first_append_entry = _last_append_entry = new_entry;
967 } else {
968 _last_append_entry->set_next(new_entry);
969 _last_append_entry = new_entry;
970 }
971 }
972 _num_entries++;
973 }
974
975 void ClassLoader::add_to_list(const char *apath) {
976 update_class_path_entry_list((char*)apath, false, false);
977 }
978
979 // Returns true IFF the file/dir exists and the entry was successfully created.
980 bool ClassLoader::update_class_path_entry_list(const char *path,
981 bool check_for_duplicates,
982 bool is_boot_append,
983 bool throw_exception) {
984 struct stat st;
985 if (os::stat(path, &st) == 0) {
986 // File or directory found
987 ClassPathEntry* new_entry = NULL;
988 Thread* THREAD = Thread::current();
989 new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false));
990 if (new_entry == NULL) {
991 return false;
992 }
993
994 // Do not reorder the bootclasspath which would break get_system_package().
995 // Add new entry to linked list
996 if (!check_for_duplicates || !contains_append_entry(new_entry->name())) {
997 ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry);
998 }
999 return true;
1000 } else {
1001 #if INCLUDE_CDS
1002 if (DumpSharedSpaces) {
1003 _shared_paths_misc_info->add_nonexist_path(path);
1004 }
1005 #endif
1006 return false;
1007 }
1008 }
1009
1010 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
1011 ResourceMark rm;
1012 int num_of_entries = module_list->length();
1013 for (int i = 0; i < num_of_entries; i++) {
1014 ClassPathEntry* e;
1015 ModuleClassPathList* mpl = module_list->at(i);
1016 tty->print("%s=", mpl->module_name()->as_C_string());
1017 e = mpl->module_first_entry();
1018 while (e != NULL) {
1019 tty->print("%s", e->name());
1020 e = e->next();
1021 if (e != NULL) {
1022 tty->print("%s", os::path_separator());
1023 }
1024 }
1025 tty->print(" ;");
1026 }
1027 }
1028
1029 void ClassLoader::print_bootclasspath() {
1030 ClassPathEntry* e;
1031 tty->print("[bootclasspath= ");
1032
1033 // Print --patch-module module/path specifications first
1034 if (_patch_mod_entries != NULL) {
1035 print_module_entry_table(_patch_mod_entries);
1036 }
1037
1038 // [jimage | exploded modules build]
1039 if (has_jrt_entry()) {
1040 // Print the location of the java runtime image
1041 tty->print("%s ;", _jrt_entry->name());
1042 } else {
1043 // Print exploded module build path specifications
1044 if (_exploded_entries != NULL) {
1045 print_module_entry_table(_exploded_entries);
1046 }
1047 }
1048
1049 // appended entries
1050 e = _first_append_entry;
1051 while (e != NULL) {
1052 tty->print("%s ;", e->name());
1053 e = e->next();
1054 }
1055 tty->print_cr("]");
1056 }
1057
1058 void ClassLoader::load_zip_library() {
1059 assert(ZipOpen == NULL, "should not load zip library twice");
1060 // First make sure native library is loaded
1061 os::native_java_library();
1062 // Load zip library
1063 char path[JVM_MAXPATHLEN];
1064 char ebuf[1024];
1065 void* handle = NULL;
1066 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
1067 handle = os::dll_load(path, ebuf, sizeof ebuf);
1068 }
1069 if (handle == NULL) {
1070 vm_exit_during_initialization("Unable to load ZIP library", path);
1071 }
1072 // Lookup zip entry points
1073 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
1074 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
1075 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
1076 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
1077 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
1078 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
1079 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
1080
1081 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
1082 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
1083 GetNextEntry == NULL || Crc32 == NULL) {
1084 vm_exit_during_initialization("Corrupted ZIP library", path);
1085 }
1086
1087 if (ZipInflateFully == NULL) {
1088 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
1089 }
1090
1091 // Lookup canonicalize entry in libjava.dll
1092 void *javalib_handle = os::native_java_library();
1093 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
1094 // This lookup only works on 1.3. Do not check for non-null here
1095 }
1096
1097 void ClassLoader::load_jimage_library() {
1098 // First make sure native library is loaded
1099 os::native_java_library();
1100 // Load jimage library
1101 char path[JVM_MAXPATHLEN];
1102 char ebuf[1024];
1103 void* handle = NULL;
1104 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
1105 handle = os::dll_load(path, ebuf, sizeof ebuf);
1106 }
1107 if (handle == NULL) {
1108 vm_exit_during_initialization("Unable to load jimage library", path);
1109 }
1110
1111 // Lookup jimage entry points
1112 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open"));
1113 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found");
1114 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close"));
1115 guarantee(JImageClose != NULL, "function JIMAGE_Close not found");
1116 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule"));
1117 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found");
1118 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource"));
1119 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found");
1120 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource"));
1121 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found");
1122 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator"));
1123 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found");
1124 JImageResourcePath = CAST_TO_FN_PTR(JImage_ResourcePath_t, os::dll_lookup(handle, "JIMAGE_ResourcePath"));
1125 guarantee(JImageResourcePath != NULL, "function JIMAGE_ResourcePath not found");
1126 }
1127
1128 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
1129 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
1130 }
1131
1132 int ClassLoader::crc32(int crc, const char* buf, int len) {
1133 assert(Crc32 != NULL, "ZIP_CRC32 is not found");
1134 return (*Crc32)(crc, (const jbyte*)buf, len);
1135 }
1136
1137 #if INCLUDE_CDS
1138 void ClassLoader::initialize_module_loader_map(JImageFile* jimage) {
1139 if (!DumpSharedSpaces) {
1140 return; // only needed for CDS dump time
1141 }
1142
1143 ResourceMark rm;
1144 jlong size;
1145 JImageLocationRef location = (*JImageFindResource)(jimage, JAVA_BASE_NAME, get_jimage_version_string(), MODULE_LOADER_MAP, &size);
1146 if (location == 0) {
1147 vm_exit_during_initialization(
1148 "Cannot find ModuleLoaderMap location from modules jimage.", NULL);
1149 }
1150 char* buffer = NEW_RESOURCE_ARRAY(char, size + 1);
1151 buffer[size] = '\0';
1152 jlong read = (*JImageGetResource)(jimage, location, buffer, size);
1153 if (read != size) {
1154 vm_exit_during_initialization(
1155 "Cannot find ModuleLoaderMap resource from modules jimage.", NULL);
1156 }
1157 char* char_buf = (char*)buffer;
1158 int buflen = (int)strlen(char_buf);
1159 char* begin_ptr = char_buf;
1160 char* end_ptr = strchr(begin_ptr, '\n');
1161 bool process_boot_modules = false;
1162 _boot_modules_array = new (ResourceObj::C_HEAP, mtModule)
1163 GrowableArray<char*>(INITIAL_BOOT_MODULES_ARRAY_SIZE, true);
1164 _platform_modules_array = new (ResourceObj::C_HEAP, mtModule)
1165 GrowableArray<char*>(INITIAL_PLATFORM_MODULES_ARRAY_SIZE, true);
1166 while (end_ptr != NULL && (end_ptr - char_buf) < buflen) {
1167 // Allocate a buffer from the C heap to be appended to the _boot_modules_array
1168 // or the _platform_modules_array.
1169 char* temp_name = NEW_C_HEAP_ARRAY(char, (size_t)(end_ptr - begin_ptr + 1), mtInternal);
1170 strncpy(temp_name, begin_ptr, end_ptr - begin_ptr);
1171 temp_name[end_ptr - begin_ptr] = '\0';
1172 if (strncmp(temp_name, "BOOT", 4) == 0) {
1173 process_boot_modules = true;
1174 FREE_C_HEAP_ARRAY(char, temp_name);
1175 } else if (strncmp(temp_name, "PLATFORM", 8) == 0) {
1176 process_boot_modules = false;
1177 FREE_C_HEAP_ARRAY(char, temp_name);
1178 } else {
1179 // module name
1180 if (process_boot_modules) {
1181 _boot_modules_array->append(temp_name);
1182 } else {
1183 _platform_modules_array->append(temp_name);
1184 }
1185 }
1186 begin_ptr = ++end_ptr;
1187 end_ptr = strchr(begin_ptr, '\n');
1188 }
1189 }
1190 #endif
1191
1192 // Function add_package extracts the package from the fully qualified class name
1193 // and checks if the package is in the boot loader's package entry table. If so,
1194 // then it sets the classpath_index in the package entry record.
1195 //
1196 // The classpath_index field is used to find the entry on the boot loader class
1197 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
1198 // in an unnamed module. It is also used to indicate (for all packages whose
1199 // classes are loaded by the boot loader) that at least one of the package's
1200 // classes has been loaded.
1201 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) {
1202 assert(fullq_class_name != NULL, "just checking");
1203
1204 // Get package name from fully qualified class name.
1205 ResourceMark rm;
1206 const char *cp = package_from_name(fullq_class_name);
1207 if (cp != NULL) {
1208 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();
1209 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp, CHECK_false);
1210 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol);
1211 if (pkg_entry != NULL) {
1212 assert(classpath_index != -1, "Unexpected classpath_index");
1213 pkg_entry->set_classpath_index(classpath_index);
1214 } else {
1215 return false;
1216 }
1217 }
1218 return true;
1219 }
1220
1221 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1222 // Look up the name in the boot loader's package entry table.
1223 if (name != NULL) {
1224 TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL);
1225 // Look for the package entry in the boot loader's package entry table.
1226 PackageEntry* package =
1227 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1228
1229 // Return NULL if package does not exist or if no classes in that package
1230 // have been loaded.
1231 if (package != NULL && package->has_loaded_class()) {
1232 ModuleEntry* module = package->module();
1233 if (module->location() != NULL) {
1234 ResourceMark rm(THREAD);
1235 Handle ml = java_lang_String::create_from_str(
1236 module->location()->as_C_string(), THREAD);
1237 return ml();
1238 }
1239 // Return entry on boot loader class path.
1240 Handle cph = java_lang_String::create_from_str(
1241 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1242 return cph();
1243 }
1244 }
1245 return NULL;
1246 }
1247
1248 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1249 ResourceMark rm(THREAD);
1250 // List of pointers to PackageEntrys that have loaded classes.
1251 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
1252 {
1253 MutexLocker ml(Module_lock, THREAD);
1254
1255 PackageEntryTable* pe_table =
1256 ClassLoaderData::the_null_class_loader_data()->packages();
1257
1258 // Collect the packages that have at least one loaded class.
1259 for (int x = 0; x < pe_table->table_size(); x++) {
1260 for (PackageEntry* package_entry = pe_table->bucket(x);
1261 package_entry != NULL;
1262 package_entry = package_entry->next()) {
1263 if (package_entry->has_loaded_class()) {
1264 loaded_class_pkgs->append(package_entry);
1265 }
1266 }
1267 }
1268 }
1269
1270
1271 // Allocate objArray and fill with java.lang.String
1272 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1273 loaded_class_pkgs->length(), CHECK_NULL);
1274 objArrayHandle result(THREAD, r);
1275 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1276 PackageEntry* package_entry = loaded_class_pkgs->at(x);
1277 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1278 result->obj_at_put(x, str());
1279 }
1280 return result();
1281 }
1282
1283 #if INCLUDE_CDS
1284 s2 ClassLoader::module_to_classloader(const char* module_name) {
1285
1286 assert(DumpSharedSpaces, "dump time only");
1287 assert(_boot_modules_array != NULL, "_boot_modules_array is NULL");
1288 assert(_platform_modules_array != NULL, "_platform_modules_array is NULL");
1289
1290 int array_size = _boot_modules_array->length();
1291 for (int i = 0; i < array_size; i++) {
1292 if (strcmp(module_name, _boot_modules_array->at(i)) == 0) {
1293 return BOOT_LOADER;
1294 }
1295 }
1296
1297 array_size = _platform_modules_array->length();
1298 for (int i = 0; i < array_size; i++) {
1299 if (strcmp(module_name, _platform_modules_array->at(i)) == 0) {
1300 return PLATFORM_LOADER;
1301 }
1302 }
1303
1304 return APP_LOADER;
1305 }
1306
1307 s2 ClassLoader::classloader_type(Symbol* class_name, ClassPathEntry* e, int classpath_index, TRAPS) {
1308 assert(DumpSharedSpaces, "Only used for CDS dump time");
1309
1310 // obtain the classloader type based on the class name.
1311 // First obtain the package name based on the class name. Then obtain
1312 // the classloader type based on the package name from the jimage using
1313 // a jimage API. If the classloader type cannot be found from the
1314 // jimage, it is determined by the class path entry.
1315 jshort loader_type = ClassLoader::APP_LOADER;
1316 if (e->is_jrt()) {
1317 ResourceMark rm;
1318 TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK_0);
1319 if (pkg_name != NULL) {
1320 const char* pkg_name_C_string = (const char*)(pkg_name->as_C_string());
1321 ClassPathImageEntry* cpie = (ClassPathImageEntry*)e;
1322 JImageFile* jimage = cpie->jimage();
1323 char* module_name = (char*)(*JImagePackageToModule)(jimage, pkg_name_C_string);
1324 if (module_name != NULL) {
1325 loader_type = ClassLoader::module_to_classloader(module_name);
1326 }
1327 }
1328 } else if (ClassLoaderExt::is_boot_classpath(classpath_index)) {
1329 loader_type = ClassLoader::BOOT_LOADER;
1330 }
1331 return loader_type;
1332 }
1333 #endif
1334
1335 // caller needs ResourceMark
1336 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1337 int class_name_len) {
1338 assert(class_name != NULL, "invariant");
1339 assert((int)strlen(class_name) == class_name_len, "invariant");
1340
1341 static const char class_suffix[] = ".class";
1342
1343 char* const file_name = NEW_RESOURCE_ARRAY(char,
1344 class_name_len +
1345 sizeof(class_suffix)); // includes term NULL
1346
1347 strncpy(file_name, class_name, class_name_len);
1348 strncpy(&file_name[class_name_len], class_suffix, sizeof(class_suffix));
1349
1350 return file_name;
1351 }
1352
1353 ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
1354 const GrowableArray<ModuleClassPathList*>* const module_list) {
1355 int num_of_entries = module_list->length();
1356 const Symbol* class_module_name = mod_entry->name();
1357
1358 // Loop through all the modules in either the patch-module or exploded entries looking for module
1359 for (int i = 0; i < num_of_entries; i++) {
1360 ModuleClassPathList* module_cpl = module_list->at(i);
1361 Symbol* module_cpl_name = module_cpl->module_name();
1362
1363 if (module_cpl_name->fast_compare(class_module_name) == 0) {
1364 // Class' module has been located.
1365 return module_cpl->module_first_entry();
1366 }
1367 }
1368 return NULL;
1369 }
1370
1371
1372 // Search either the patch-module or exploded build entries for class.
1373 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list,
1374 const char* const class_name,
1375 const char* const file_name,
1376 TRAPS) {
1377 ClassFileStream* stream = NULL;
1378
1379 // Find the class' defining module in the boot loader's module entry table
1380 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
1381 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL;
1382
1383 // If the module system has not defined java.base yet, then
1384 // classes loaded are assumed to be defined to java.base.
1385 // When java.base is eventually defined by the module system,
1386 // all packages of classes that have been previously loaded
1387 // are verified in ModuleEntryTable::verify_javabase_packages().
1388 if (!Universe::is_module_initialized() &&
1389 !ModuleEntryTable::javabase_defined() &&
1390 mod_entry == NULL) {
1391 mod_entry = ModuleEntryTable::javabase_moduleEntry();
1392 }
1393
1394 // The module must be a named module
1395 ClassPathEntry* e = NULL;
1396 if (mod_entry != NULL && mod_entry->is_named()) {
1397 if (module_list == _exploded_entries) {
1398 // The exploded build entries can be added to at any time so a lock is
1399 // needed when searching them.
1400 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
1401 MutexLocker ml(Module_lock, THREAD);
1402 e = find_first_module_cpe(mod_entry, module_list);
1403 } else {
1404 e = find_first_module_cpe(mod_entry, module_list);
1405 }
1406 }
1407
1408 // Try to load the class from the module's ClassPathEntry list.
1409 while (e != NULL) {
1410 stream = e->open_stream(file_name, CHECK_NULL);
1411 // No context.check is required since CDS is not supported
1412 // for an exploded modules build or if --patch-module is specified.
1413 if (NULL != stream) {
1414 return stream;
1415 }
1416 e = e->next();
1417 }
1418 // If the module was located, break out even if the class was not
1419 // located successfully from that module's ClassPathEntry list.
1420 // There will not be another valid entry for that module.
1421 return NULL;
1422 }
1423
1424 InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1425 assert(name != NULL, "invariant");
1426 assert(THREAD->is_Java_thread(), "must be a JavaThread");
1427
1428 ResourceMark rm(THREAD);
1429 HandleMark hm(THREAD);
1430
1431 const char* const class_name = name->as_C_string();
1432
1433 EventMark m("loading class %s", class_name);
1434 ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion);
1435
1436 const char* const file_name = file_name_for_class_name(class_name,
1437 name->utf8_length());
1438 assert(file_name != NULL, "invariant");
1439
1440 ClassLoaderExt::Context context(class_name, file_name, THREAD);
1441
1442 // Lookup stream for parsing .class file
1443 ClassFileStream* stream = NULL;
1444 s2 classpath_index = 0;
1445 ClassPathEntry* e = NULL;
1446
1447 // If DumpSharedSpaces is true boot loader visibility boundaries are set to:
1448 // - [jimage] + [_first_append_entry to _last_append_entry] (all path entries).
1449 //
1450 // If search_append_only is true, boot loader visibility boundaries are
1451 // set to be _first_append_entry to the end. This includes:
1452 // [-Xbootclasspath/a]; [jvmti appended entries]
1453 //
1454 // If both DumpSharedSpaces and search_append_only are false, boot loader
1455 // visibility boundaries are set to be the --patch-module entries plus the base piece.
1456 // This would include:
1457 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1458 //
1459 // DumpSharedSpaces and search_append_only are mutually exclusive and cannot
1460 // be true at the same time.
1461 assert(!(DumpSharedSpaces && search_append_only), "DumpSharedSpaces and search_append_only are both true");
1462
1463 // Load Attempt #1: --patch-module
1464 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1465 // attempt to load the class from those locations specific to the module.
1466 // Specifications to --patch-module can contain a partial number of classes
1467 // that are part of the overall module definition. So if a particular class is not
1468 // found within its module specification, the search should continue to Load Attempt #2.
1469 // Note: The --patch-module entries are never searched if the boot loader's
1470 // visibility boundary is limited to only searching the append entries.
1471 if (_patch_mod_entries != NULL && !search_append_only) {
1472 // At CDS dump time, the --patch-module entries are ignored. That means a
1473 // class is still loaded from the runtime image even if it might
1474 // appear in the _patch_mod_entries. The runtime shared class visibility
1475 // check will determine if a shared class is visible based on the runtime
1476 // environemnt, including the runtime --patch-module setting.
1477 if (!DumpSharedSpaces) {
1478 stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL);
1479 }
1480 }
1481
1482 // Load Attempt #2: [jimage | exploded build]
1483 if (!search_append_only && (NULL == stream)) {
1484 if (has_jrt_entry()) {
1485 e = _jrt_entry;
1486 stream = _jrt_entry->open_stream(file_name, CHECK_NULL);
1487 if (!context.check(stream, classpath_index)) {
1488 return NULL;
1489 }
1490 } else {
1491 // Exploded build - attempt to locate class in its defining module's location.
1492 assert(_exploded_entries != NULL, "No exploded build entries present");
1493 stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL);
1494 }
1495 }
1496
1497 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1498 if ((search_append_only || DumpSharedSpaces) && (NULL == stream)) {
1499 // For the boot loader append path search, the starting classpath_index
1500 // for the appended piece is always 1 to account for either the
1501 // _jrt_entry or the _exploded_entries.
1502 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1503 classpath_index = 1;
1504
1505 e = _first_append_entry;
1506 while (e != NULL) {
1507 stream = e->open_stream(file_name, CHECK_NULL);
1508 if (!context.check(stream, classpath_index)) {
1509 return NULL;
1510 }
1511 if (NULL != stream) {
1512 break;
1513 }
1514 e = e->next();
1515 ++classpath_index;
1516 }
1517 }
1518
1519 if (NULL == stream) {
1520 if (DumpSharedSpaces) {
1521 tty->print_cr("Preload Warning: Cannot find %s", class_name);
1522 }
1523 return NULL;
1524 }
1525
1526 stream->set_verify(context.should_verify(classpath_index));
1527
1528 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1529 Handle protection_domain;
1530
1531 InstanceKlass* result = KlassFactory::create_from_stream(stream,
1532 name,
1533 loader_data,
1534 protection_domain,
1535 NULL, // host_klass
1536 NULL, // cp_patches
1537 THREAD);
1538 if (HAS_PENDING_EXCEPTION) {
1539 if (DumpSharedSpaces) {
1540 tty->print_cr("Preload Error: Failed to load %s", class_name);
1541 }
1542 return NULL;
1543 }
1544
1545 return context.record_result(name, e, classpath_index, result, THREAD);
1546 }
1547
1548 // Initialize the class loader's access to methods in libzip. Parse and
1549 // process the boot classpath into a list ClassPathEntry objects. Once
1550 // this list has been created, it must not change order (see class PackageInfo)
1551 // it can be appended to and is by jvmti and the kernel vm.
1552
1553 void ClassLoader::initialize() {
1554 EXCEPTION_MARK;
1555
1556 if (UsePerfData) {
1557 // jvmstat performance counters
1558 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1559 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1560 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1561 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1562 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1563 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1564 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1565 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1566 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1567 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1568
1569 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1570 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1571 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1572 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1573 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1574 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1575 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1576 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1577 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1578 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1579 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1580 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1581 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1582
1583
1584 // The following performance counters are added for measuring the impact
1585 // of the bug fix of 6365597. They are mainly focused on finding out
1586 // the behavior of system & user-defined classloader lock, whether
1587 // ClassLoader.loadClass/findClass is being called synchronized or not.
1588 // Also two additional counters are created to see whether 'UnsyncloadClass'
1589 // flag is being set or not and how many times load_instance_class call
1590 // fails with linkageError etc.
1591 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1592 "systemLoaderLockContentionRate");
1593 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1594 "nonSystemLoaderLockContentionRate");
1595 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1596 "jvmFindLoadedClassNoLockCalls");
1597 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1598 "jvmDefineClassNoLockCalls");
1599
1600 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1601 "jniDefineClassNoLockCalls");
1602
1603 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1604 "unsafeDefineClassCalls");
1605
1606 NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet");
1607 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1608 "loadInstanceClassFailRate");
1609
1610 // increment the isUnsyncloadClass counter if UnsyncloadClass is set.
1611 if (UnsyncloadClass) {
1612 _isUnsyncloadClass->inc();
1613 }
1614 }
1615
1616 // lookup zip library entry points
1617 load_zip_library();
1618 // lookup jimage library entry points
1619 load_jimage_library();
1620 #if INCLUDE_CDS
1621 // initialize search path
1622 if (DumpSharedSpaces) {
1623 _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
1624 }
1625 #endif
1626 setup_bootstrap_search_path();
1627 }
1628
1629 #if INCLUDE_CDS
1630 void ClassLoader::initialize_shared_path() {
1631 if (DumpSharedSpaces) {
1632 ClassLoaderExt::setup_search_paths();
1633 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1634 }
1635 }
1636 #endif
1637
1638 jlong ClassLoader::classloader_time_ms() {
1639 return UsePerfData ?
1640 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1641 }
1642
1643 jlong ClassLoader::class_init_count() {
1644 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1645 }
1646
1647 jlong ClassLoader::class_init_time_ms() {
1648 return UsePerfData ?
1649 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1650 }
1651
1652 jlong ClassLoader::class_verify_time_ms() {
1653 return UsePerfData ?
1654 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1655 }
1656
1657 jlong ClassLoader::class_link_count() {
1658 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1659 }
1660
1661 jlong ClassLoader::class_link_time_ms() {
1662 return UsePerfData ?
1663 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1664 }
1665
1666 int ClassLoader::compute_Object_vtable() {
1667 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1668 // code to determine actual value from file
1669 // Would be value '11' if finals were in vtable
1670 int JDK_1_2_Object_vtable_size = 5;
1671 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1672 }
1673
1674
1675 void classLoader_init1() {
1676 ClassLoader::initialize();
1677 }
1678
1679 // Complete the ClassPathEntry setup for the boot loader
1680 void ClassLoader::classLoader_init2(TRAPS) {
1681 // Setup the list of module/path pairs for --patch-module processing
1682 // This must be done after the SymbolTable is created in order
1683 // to use fast_compare on module names instead of a string compare.
1684 if (Arguments::get_patch_mod_prefix() != NULL) {
1685 setup_patch_mod_entries();
1686 }
1687
1688 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
1689 // to successfully determine if java.base has been patched)
1690 create_javabase();
1691
1692 // Setup the initial java.base/path pair for the exploded build entries.
1693 // As more modules are defined during module system initialization, more
1694 // entries will be added to the exploded build array.
1695 if (!has_jrt_entry()) {
1696 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds");
1697 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds");
1698 // Set up the boot loader's _exploded_entries list. Note that this gets
1699 // done before loading any classes, by the same thread that will
1700 // subsequently do the first class load. So, no lock is needed for this.
1701 assert(_exploded_entries == NULL, "Should only get initialized once");
1702 _exploded_entries = new (ResourceObj::C_HEAP, mtModule)
1703 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true);
1704 add_to_exploded_build_list(vmSymbols::java_base(), CHECK);
1705 }
1706 }
1707
1708
1709 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1710 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1711 if (CanonicalizeEntry != NULL) {
1712 JavaThread* THREAD = JavaThread::current();
1713 JNIEnv* env = THREAD->jni_environment();
1714 ResourceMark rm(THREAD);
1715
1716 // os::native_path writes into orig_copy
1717 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1718 strcpy(orig_copy, orig);
1719 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1720 return false;
1721 }
1722 } else {
1723 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1724 strncpy(out, orig, len);
1725 out[len - 1] = '\0';
1726 }
1727 return true;
1728 }
1729
1730 void ClassLoader::create_javabase() {
1731 Thread* THREAD = Thread::current();
1732
1733 // Create java.base's module entry for the boot
1734 // class loader prior to loading j.l.Ojbect.
1735 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1736
1737 // Get module entry table
1738 ModuleEntryTable* null_cld_modules = null_cld->modules();
1739 if (null_cld_modules == NULL) {
1740 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1741 }
1742
1743 {
1744 MutexLocker ml(Module_lock, THREAD);
1745 ModuleEntry* jb_module = null_cld_modules->locked_create_entry_or_null(Handle(),
1746 false, vmSymbols::java_base(), NULL, NULL, null_cld);
1747 if (jb_module == NULL) {
1748 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
1749 }
1750 ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1751 }
1752 }
1753
1754 #ifndef PRODUCT
1755
1756 // CompileTheWorld
1757 //
1758 // Iterates over all class path entries and forces compilation of all methods
1759 // in all classes found. Currently, only zip/jar archives are searched.
1760 //
1761 // The classes are loaded by the Java level bootstrap class loader, and the
1762 // initializer is called. If DelayCompilationDuringStartup is true (default),
1763 // the interpreter will run the initialization code. Note that forcing
1764 // initialization in this way could potentially lead to initialization order
1765 // problems, in which case we could just force the initialization bit to be set.
1766
1767
1768 // We need to iterate over the contents of a zip/jar file, so we replicate the
1769 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1770 // since jzfile already has a void* definition.
1771 //
1772 // Note that this is only used in debug mode.
1773 //
1774 // HotSpot integration note:
1775 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1776
1777
1778 // JDK 1.3 version
1779 typedef struct real_jzentry { /* Zip file entry */
1780 char *name; /* entry name */
1781 jint time; /* modification time */
1782 jint size; /* size of uncompressed data */
1783 jint csize; /* size of compressed data (zero if uncompressed) */
1784 jint crc; /* crc of uncompressed data */
1785 char *comment; /* optional zip file comment */
1786 jbyte *extra; /* optional extra data */
1787 jint pos; /* position of LOC header (if negative) or data */
1788 } real_jzentry;
1789
1790 typedef struct real_jzfile { /* Zip file */
1791 char *name; /* zip file name */
1792 jint refs; /* number of active references */
1793 jint fd; /* open file descriptor */
1794 void *lock; /* read lock */
1795 char *comment; /* zip file comment */
1796 char *msg; /* zip error message */
1797 void *entries; /* array of hash cells */
1798 jint total; /* total number of entries */
1799 unsigned short *table; /* Hash chain heads: indexes into entries */
1800 jint tablelen; /* number of hash eads */
1801 real_jzfile *next; /* next zip file in search list */
1802 jzentry *cache; /* we cache the most recently freed jzentry */
1803 /* Information on metadata names in META-INF directory */
1804 char **metanames; /* array of meta names (may have null names) */
1805 jint metacount; /* number of slots in metanames array */
1806 /* If there are any per-entry comments, they are in the comments array */
1807 char **comments;
1808 } real_jzfile;
1809
1810 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1811 // For now we only compile all methods in all classes in zip/jar files
1812 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1813 tty->cr();
1814 }
1815
1816 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1817 real_jzfile* zip = (real_jzfile*) _zip;
1818 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1819 tty->cr();
1820 // Iterate over all entries in zip file
1821 for (int n = 0; ; n++) {
1822 real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n));
1823 if (ze == NULL) break;
1824 ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1825 }
1826 if (HAS_PENDING_EXCEPTION) {
1827 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1828 CLEAR_PENDING_EXCEPTION;
1829 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1830 tty->print_cr("Increase class metadata storage if a limit was set");
1831 } else {
1832 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1833 }
1834 }
1835 }
1836
1837 void ClassLoader::compile_the_world() {
1838 EXCEPTION_MARK;
1839 HandleMark hm(THREAD);
1840 ResourceMark rm(THREAD);
1841
1842 assert(has_jrt_entry(), "Compile The World not supported with exploded module build");
1843
1844 // Find bootstrap loader
1845 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1846 jlong start = os::javaTimeMillis();
1847
1848 // Compile the world for the modular java runtime image
1849 _jrt_entry->compile_the_world(system_class_loader, CATCH);
1850
1851 // Iterate over all bootstrap class path appended entries
1852 ClassPathEntry* e = _first_append_entry;
1853 while (e != NULL) {
1854 assert(!e->is_jrt(), "A modular java runtime image is present on the list of appended entries");
1855 e->compile_the_world(system_class_loader, CATCH);
1856 e = e->next();
1857 }
1858 jlong end = os::javaTimeMillis();
1859 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1860 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1861 {
1862 // Print statistics as if before normal exit:
1863 extern void print_statistics();
1864 print_statistics();
1865 }
1866 vm_exit(0);
1867 }
1868
1869 int ClassLoader::_compile_the_world_class_counter = 0;
1870 int ClassLoader::_compile_the_world_method_counter = 0;
1871 static int _codecache_sweep_counter = 0;
1872
1873 // Filter out all exceptions except OOMs
1874 static void clear_pending_exception_if_not_oom(TRAPS) {
1875 if (HAS_PENDING_EXCEPTION &&
1876 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1877 CLEAR_PENDING_EXCEPTION;
1878 }
1879 // The CHECK at the caller will propagate the exception out
1880 }
1881
1882 /**
1883 * Returns if the given method should be compiled when doing compile-the-world.
1884 *
1885 * TODO: This should be a private method in a CompileTheWorld class.
1886 */
1887 static bool can_be_compiled(methodHandle m, int comp_level) {
1888 assert(CompileTheWorld, "must be");
1889
1890 // It's not valid to compile a native wrapper for MethodHandle methods
1891 // that take a MemberName appendix since the bytecode signature is not
1892 // correct.
1893 vmIntrinsics::ID iid = m->intrinsic_id();
1894 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1895 return false;
1896 }
1897
1898 return CompilationPolicy::can_be_compiled(m, comp_level);
1899 }
1900
1901 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1902 if (string_ends_with(name, ".class")) {
1903 // We have a .class file
1904 int len = (int)strlen(name);
1905 char buffer[2048];
1906 strncpy(buffer, name, len - 6);
1907 buffer[len-6] = 0;
1908 // If the file has a period after removing .class, it's not really a
1909 // valid class file. The class loader will check everything else.
1910 if (strchr(buffer, '.') == NULL) {
1911 _compile_the_world_class_counter++;
1912 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
1913
1914 // Construct name without extension
1915 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
1916 // Use loader to load and initialize class
1917 Klass* k = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
1918 if (k != NULL && !HAS_PENDING_EXCEPTION) {
1919 k->initialize(THREAD);
1920 }
1921 bool exception_occurred = HAS_PENDING_EXCEPTION;
1922 clear_pending_exception_if_not_oom(CHECK);
1923 if (CompileTheWorldPreloadClasses && k != NULL) {
1924 InstanceKlass* ik = InstanceKlass::cast(k);
1925 ConstantPool::preload_and_initialize_all_classes(ik->constants(), THREAD);
1926 if (HAS_PENDING_EXCEPTION) {
1927 // If something went wrong in preloading we just ignore it
1928 clear_pending_exception_if_not_oom(CHECK);
1929 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
1930 }
1931 }
1932
1933 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
1934 if (k == NULL || exception_occurred) {
1935 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
1936 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
1937 } else {
1938 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
1939 // Preload all classes to get around uncommon traps
1940 // Iterate over all methods in class
1941 int comp_level = CompilationPolicy::policy()->initial_compile_level();
1942 InstanceKlass* ik = InstanceKlass::cast(k);
1943 for (int n = 0; n < ik->methods()->length(); n++) {
1944 methodHandle m (THREAD, ik->methods()->at(n));
1945 if (can_be_compiled(m, comp_level)) {
1946 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
1947 // Give sweeper a chance to keep up with CTW
1948 VM_CTWThreshold op;
1949 VMThread::execute(&op);
1950 _codecache_sweep_counter = 0;
1951 }
1952 // Force compilation
1953 CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
1954 methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
1955 if (HAS_PENDING_EXCEPTION) {
1956 clear_pending_exception_if_not_oom(CHECK);
1957 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1958 } else {
1959 _compile_the_world_method_counter++;
1960 }
1961 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
1962 // Clobber the first compile and force second tier compilation
1963 CompiledMethod* nm = m->code();
1964 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1965 // Throw out the code so that the code cache doesn't fill up
1966 nm->make_not_entrant();
1967 }
1968 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
1969 methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
1970 if (HAS_PENDING_EXCEPTION) {
1971 clear_pending_exception_if_not_oom(CHECK);
1972 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1973 } else {
1974 _compile_the_world_method_counter++;
1975 }
1976 }
1977 } else {
1978 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1979 }
1980
1981 CompiledMethod* nm = m->code();
1982 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1983 // Throw out the code so that the code cache doesn't fill up
1984 nm->make_not_entrant();
1985 }
1986 }
1987 }
1988 }
1989 }
1990 }
1991 }
1992
1993 #endif //PRODUCT
1994
1995 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1996 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1997 void PerfClassTraceTime::initialize() {
1998 if (!UsePerfData) return;
1999
2000 if (_eventp != NULL) {
2001 // increment the event counter
2002 _eventp->inc();
2003 }
2004
2005 // stop the current active thread-local timer to measure inclusive time
2006 _prev_active_event = -1;
2007 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
2008 if (_timers[i].is_active()) {
2009 assert(_prev_active_event == -1, "should have only one active timer");
2010 _prev_active_event = i;
2011 _timers[i].stop();
2012 }
2013 }
2014
2015 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
2016 // start the inclusive timer if not recursively called
2017 _t.start();
2018 }
2019
2020 // start thread-local timer of the given event type
2021 if (!_timers[_event_type].is_active()) {
2022 _timers[_event_type].start();
2023 }
2024 }
2025
2026 PerfClassTraceTime::~PerfClassTraceTime() {
2027 if (!UsePerfData) return;
2028
2029 // stop the thread-local timer as the event completes
2030 // and resume the thread-local timer of the event next on the stack
2031 _timers[_event_type].stop();
2032 jlong selftime = _timers[_event_type].ticks();
2033
2034 if (_prev_active_event >= 0) {
2035 _timers[_prev_active_event].start();
2036 }
2037
2038 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
2039
2040 // increment the counters only on the leaf call
2041 _t.stop();
2042 _timep->inc(_t.ticks());
2043 if (_selftimep != NULL) {
2044 _selftimep->inc(selftime);
2045 }
2046 // add all class loading related event selftime to the accumulated time counter
2047 ClassLoader::perf_accumulated_time()->inc(selftime);
2048
2049 // reset the timer
2050 _timers[_event_type].reset();
2051 }