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/log.hpp"
44 #include "logging/logStream.hpp"
45 #include "logging/logTag.hpp"
46 #include "memory/allocation.inline.hpp"
47 #include "memory/filemap.hpp"
48 #include "memory/oopFactory.hpp"
49 #include "memory/resourceArea.hpp"
50 #include "memory/universe.inline.hpp"
51 #include "oops/instanceKlass.hpp"
52 #include "oops/instanceRefKlass.hpp"
53 #include "oops/objArrayOop.inline.hpp"
54 #include "oops/oop.inline.hpp"
55 #include "oops/symbol.hpp"
56 #include "prims/jvm_misc.hpp"
57 #include "runtime/arguments.hpp"
58 #include "runtime/compilationPolicy.hpp"
59 #include "runtime/fprofiler.hpp"
60 #include "runtime/handles.hpp"
61 #include "runtime/handles.inline.hpp"
62 #include "runtime/init.hpp"
63 #include "runtime/interfaceSupport.hpp"
64 #include "runtime/java.hpp"
65 #include "runtime/javaCalls.hpp"
66 #include "runtime/os.hpp"
67 #include "runtime/threadCritical.hpp"
68 #include "runtime/timer.hpp"
69 #include "runtime/vm_version.hpp"
70 #include "services/management.hpp"
71 #include "services/threadService.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/hashtable.inline.hpp"
74 #include "utilities/macros.hpp"
75 #if INCLUDE_CDS
76 #include "classfile/sharedClassUtil.hpp"
77 #include "classfile/sharedPathsMiscInfo.hpp"
78 #endif
79
80 // Entry points in zip.dll for loading zip/jar file entries
81
82 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg);
83 typedef void (JNICALL *ZipClose_t)(jzfile *zip);
84 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
85 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
86 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n);
87 typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg);
88 typedef jint (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len);
89
90 static ZipOpen_t ZipOpen = NULL;
91 static ZipClose_t ZipClose = NULL;
92 static FindEntry_t FindEntry = NULL;
93 static ReadEntry_t ReadEntry = 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 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = NULL;
145 ClassPathEntry* ClassLoader::_jrt_entry = NULL;
146 ClassPathEntry* ClassLoader::_first_append_entry = NULL;
147 ClassPathEntry* ClassLoader::_last_append_entry = NULL;
148 int ClassLoader::_num_entries = 0;
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 // read contents into resource array
340 int size = (*filesize) + ((nul_terminate) ? 1 : 0);
341 buffer = NEW_RESOURCE_ARRAY(u1, size);
342 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
343
344 // return result
345 if (nul_terminate) {
346 buffer[*filesize] = 0;
347 }
348 return buffer;
349 }
350
351 #if INCLUDE_CDS
352 u1* ClassPathZipEntry::open_versioned_entry(const char* name, jint* filesize, TRAPS) {
353 u1* buffer = NULL;
354 if (DumpSharedSpaces && !_is_boot_append) {
355 // We presume default is multi-release enabled
356 const char* multi_ver = Arguments::get_property("jdk.util.jar.enableMultiRelease");
357 const char* verstr = Arguments::get_property("jdk.util.jar.version");
358 bool is_multi_ver = (multi_ver == NULL ||
359 strcmp(multi_ver, "true") == 0 ||
360 strcmp(multi_ver, "force") == 0) &&
361 is_multiple_versioned(THREAD);
362 // command line version setting
363 int version = 0;
364 const int base_version = 8; // JDK8
365 int cur_ver = JDK_Version::current().major_version();
366 if (verstr != NULL) {
367 version = atoi(verstr);
368 if (version < base_version || version > cur_ver) {
369 // If the specified version is lower than the base version, the base
370 // entry will be used; if the version is higher than the current
371 // jdk version, the highest versioned entry will be used.
372 if (version < base_version) {
373 is_multi_ver = false;
374 }
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_NAME, 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(), CHECK_NULL);
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 LogTarget(Info, class, path) lt;
614 if (lt.is_enabled()) {
615 LogStream ls(lt);
616 if (msg) {
617 ls.print("%s", msg);
618 }
619 if (name) {
620 if (strlen(name) < 256) {
621 ls.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 ls.print("%c", name[0]);
627 name++;
628 }
629 }
630 }
631 ls.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_IFMT) != S_IFREG) { // is not a regular file
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 const char* sys_class_path = Arguments::get_sysclasspath();
655 const char* java_class_path = Arguments::get_appclasspath();
656 if (PrintSharedArchiveAndExit) {
657 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
658 // the same as the bootcp of the shared archive.
659 } else {
660 trace_class_path("bootstrap loader class path=", sys_class_path);
661 trace_class_path("classpath: ", java_class_path);
662 }
663 #if INCLUDE_CDS
664 if (DumpSharedSpaces) {
665 _shared_paths_misc_info->add_boot_classpath(sys_class_path);
666 }
667 #endif
668 setup_search_path(sys_class_path, true);
669 }
670
671 #if INCLUDE_CDS
672 int ClassLoader::get_shared_paths_misc_info_size() {
673 return _shared_paths_misc_info->get_used_bytes();
674 }
675
676 void* ClassLoader::get_shared_paths_misc_info() {
677 return _shared_paths_misc_info->buffer();
678 }
679
680 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
681 SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
682 bool result = checker->check();
683 delete checker;
684 return result;
685 }
686 #endif
687
688 // Construct the array of module/path pairs as specified to --patch-module
689 // for the boot loader to search ahead of the jimage, if the class being
690 // loaded is defined to a module that has been specified to --patch-module.
691 void ClassLoader::setup_patch_mod_entries() {
692 Thread* THREAD = Thread::current();
693 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
694 int num_of_entries = patch_mod_args->length();
695
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 // Determine whether the module has been patched via the command-line
745 // option --patch-module
746 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
747 if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) {
748 int table_len = _patch_mod_entries->length();
749 for (int i = 0; i < table_len; i++) {
750 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
751 if (module_name->fast_compare(patch_mod->module_name()) == 0) {
752 return true;
753 }
754 }
755 }
756 return false;
757 }
758
759 void ClassLoader::setup_search_path(const char *class_path, bool bootstrap_search) {
760 int len = (int)strlen(class_path);
761 int end = 0;
762 bool set_base_piece = bootstrap_search;
763
764 // Iterate over class path entries
765 for (int start = 0; start < len; start = end) {
766 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
767 end++;
768 }
769 EXCEPTION_MARK;
770 ResourceMark rm(THREAD);
771 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
772 strncpy(path, &class_path[start], end - start);
773 path[end - start] = '\0';
774
775 // The first time through the bootstrap_search setup, it must be determined
776 // what the base or core piece of the boot loader search is. Either a java runtime
777 // image is present or this is an exploded module build situation.
778 if (set_base_piece) {
779 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
780 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
781 struct stat st;
782 if (os::stat(path, &st) == 0) {
783 // Directory found
784 Thread* THREAD = Thread::current();
785 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
786
787 // Check for a jimage
788 if (Arguments::has_jimage()) {
789 assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice");
790 assert(new_entry != NULL && new_entry->is_jrt(), "No java runtime image present");
791 _jrt_entry = new_entry;
792 ++_num_entries;
793 #if INCLUDE_CDS
794 if (DumpSharedSpaces) {
795 JImageFile *jimage = _jrt_entry->jimage();
796 assert(jimage != NULL, "No java runtime image file present");
797 ClassLoader::initialize_module_loader_map(jimage);
798 }
799 #endif
800 }
801 } else {
802 // If path does not exist, exit
803 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
804 }
805 set_base_piece = false;
806 } else {
807 // Every entry on the system boot class path after the initial base piece,
808 // which is set by os::set_boot_path(), is considered an appended entry.
809 update_class_path_entry_list(path, false, bootstrap_search);
810 }
811
812 #if INCLUDE_CDS
813 if (DumpSharedSpaces) {
814 check_shared_classpath(path);
815 }
816 #endif
817 while (class_path[end] == os::path_separator()[0]) {
818 end++;
819 }
820 }
821 }
822
823 // During an exploded modules build, each module defined to the boot loader
824 // will be added to the ClassLoader::_exploded_entries array.
825 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) {
826 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
827 assert(_exploded_entries != NULL, "_exploded_entries was not initialized");
828
829 // Find the module's symbol
830 ResourceMark rm(THREAD);
831 const char *module_name = module_sym->as_C_string();
832 const char *home = Arguments::get_java_home();
833 const char file_sep = os::file_separator()[0];
834 // 10 represents the length of "modules" + 2 file separators + \0
835 size_t len = strlen(home) + strlen(module_name) + 10;
836 char *path = NEW_C_HEAP_ARRAY(char, len, mtModule);
837 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
838
839 struct stat st;
840 if (os::stat(path, &st) == 0) {
841 // Directory found
842 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
843
844 // If the path specification is valid, enter it into this module's list.
845 // There is no need to check for duplicate modules in the exploded entry list,
846 // since no two modules with the same name can be defined to the boot loader.
847 // This is checked at module definition time in Modules::define_module.
848 if (new_entry != NULL) {
849 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
850 module_cpl->add_to_list(new_entry);
851 {
852 MutexLocker ml(Module_lock, THREAD);
853 _exploded_entries->push(module_cpl);
854 }
855 log_info(class, load)("path: %s", path);
856 }
857 }
858 FREE_C_HEAP_ARRAY(char, path);
859 }
860
861 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
862 bool throw_exception,
863 bool is_boot_append, TRAPS) {
864 JavaThread* thread = JavaThread::current();
865 ClassPathEntry* new_entry = NULL;
866 if ((st->st_mode & S_IFMT) == S_IFREG) {
867 ResourceMark rm(thread);
868 // Regular file, should be a zip or jimage file
869 // Canonicalized filename
870 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
871 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
872 // This matches the classic VM
873 if (throw_exception) {
874 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
875 } else {
876 return NULL;
877 }
878 }
879 jint error;
880 JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
881 if (jimage != NULL) {
882 new_entry = new ClassPathImageEntry(jimage, canonical_path);
883 } else {
884 char* error_msg = NULL;
885 jzfile* zip;
886 {
887 // enable call to C land
888 ThreadToNativeFromVM ttn(thread);
889 HandleMark hm(thread);
890 zip = (*ZipOpen)(canonical_path, &error_msg);
891 }
892 if (zip != NULL && error_msg == NULL) {
893 new_entry = new ClassPathZipEntry(zip, path, is_boot_append);
894 } else {
895 char *msg;
896 if (error_msg == NULL) {
897 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ;
898 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
899 } else {
900 int len = (int)(strlen(path) + strlen(error_msg) + 128);
901 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ;
902 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
903 }
904 // Don't complain about bad jar files added via -Xbootclasspath/a:.
905 if (throw_exception && is_init_completed()) {
906 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
907 } else {
908 return NULL;
909 }
910 }
911 }
912 log_info(class, path)("opened: %s", path);
913 log_info(class, load)("opened: %s", path);
914 } else {
915 // Directory
916 new_entry = new ClassPathDirEntry(path);
917 log_info(class, load)("path: %s", path);
918 }
919 return new_entry;
920 }
921
922
923 // Create a class path zip entry for a given path (return NULL if not found
924 // or zip/JAR file cannot be opened)
925 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
926 // check for a regular file
927 struct stat st;
928 if (os::stat(path, &st) == 0) {
929 if ((st.st_mode & S_IFMT) == S_IFREG) {
930 char canonical_path[JVM_MAXPATHLEN];
931 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
932 char* error_msg = NULL;
933 jzfile* zip;
934 {
935 // enable call to C land
936 JavaThread* thread = JavaThread::current();
937 ThreadToNativeFromVM ttn(thread);
938 HandleMark hm(thread);
939 zip = (*ZipOpen)(canonical_path, &error_msg);
940 }
941 if (zip != NULL && error_msg == NULL) {
942 // create using canonical path
943 return new ClassPathZipEntry(zip, canonical_path, is_boot_append);
944 }
945 }
946 }
947 }
948 return NULL;
949 }
950
951 // returns true if entry already on class path
952 bool ClassLoader::contains_append_entry(const char* name) {
953 ClassPathEntry* e = _first_append_entry;
954 while (e != NULL) {
955 // assume zip entries have been canonicalized
956 if (strcmp(name, e->name()) == 0) {
957 return true;
958 }
959 e = e->next();
960 }
961 return false;
962 }
963
964 void ClassLoader::add_to_list(ClassPathEntry *new_entry) {
965 if (new_entry != NULL) {
966 if (_last_append_entry == NULL) {
967 assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty");
968 _first_append_entry = _last_append_entry = new_entry;
969 } else {
970 _last_append_entry->set_next(new_entry);
971 _last_append_entry = new_entry;
972 }
973 }
974 _num_entries++;
975 }
976
977 void ClassLoader::add_to_list(const char *apath) {
978 update_class_path_entry_list((char*)apath, false, false);
979 }
980
981 // Returns true IFF the file/dir exists and the entry was successfully created.
982 bool ClassLoader::update_class_path_entry_list(const char *path,
983 bool check_for_duplicates,
984 bool is_boot_append,
985 bool throw_exception) {
986 struct stat st;
987 if (os::stat(path, &st) == 0) {
988 // File or directory found
989 ClassPathEntry* new_entry = NULL;
990 Thread* THREAD = Thread::current();
991 new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false));
992 if (new_entry == NULL) {
993 return false;
994 }
995
996 // Do not reorder the bootclasspath which would break get_system_package().
997 // Add new entry to linked list
998 if (!check_for_duplicates || !contains_append_entry(new_entry->name())) {
999 ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry);
1000 }
1001 return true;
1002 } else {
1003 #if INCLUDE_CDS
1004 if (DumpSharedSpaces) {
1005 _shared_paths_misc_info->add_nonexist_path(path);
1006 }
1007 #endif
1008 return false;
1009 }
1010 }
1011
1012 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
1013 ResourceMark rm;
1014 int num_of_entries = module_list->length();
1015 for (int i = 0; i < num_of_entries; i++) {
1016 ClassPathEntry* e;
1017 ModuleClassPathList* mpl = module_list->at(i);
1018 tty->print("%s=", mpl->module_name()->as_C_string());
1019 e = mpl->module_first_entry();
1020 while (e != NULL) {
1021 tty->print("%s", e->name());
1022 e = e->next();
1023 if (e != NULL) {
1024 tty->print("%s", os::path_separator());
1025 }
1026 }
1027 tty->print(" ;");
1028 }
1029 }
1030
1031 void ClassLoader::print_bootclasspath() {
1032 ClassPathEntry* e;
1033 tty->print("[bootclasspath= ");
1034
1035 // Print --patch-module module/path specifications first
1036 if (_patch_mod_entries != NULL) {
1037 print_module_entry_table(_patch_mod_entries);
1038 }
1039
1040 // [jimage | exploded modules build]
1041 if (has_jrt_entry()) {
1042 // Print the location of the java runtime image
1043 tty->print("%s ;", _jrt_entry->name());
1044 } else {
1045 // Print exploded module build path specifications
1046 if (_exploded_entries != NULL) {
1047 print_module_entry_table(_exploded_entries);
1048 }
1049 }
1050
1051 // appended entries
1052 e = _first_append_entry;
1053 while (e != NULL) {
1054 tty->print("%s ;", e->name());
1055 e = e->next();
1056 }
1057 tty->print_cr("]");
1058 }
1059
1060 void ClassLoader::load_zip_library() {
1061 assert(ZipOpen == NULL, "should not load zip library twice");
1062 // First make sure native library is loaded
1063 os::native_java_library();
1064 // Load zip library
1065 char path[JVM_MAXPATHLEN];
1066 char ebuf[1024];
1067 void* handle = NULL;
1068 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
1069 handle = os::dll_load(path, ebuf, sizeof ebuf);
1070 }
1071 if (handle == NULL) {
1072 vm_exit_during_initialization("Unable to load ZIP library", path);
1073 }
1074 // Lookup zip entry points
1075 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
1076 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
1077 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
1078 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
1079 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
1080 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
1081 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
1082
1083 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
1084 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
1085 GetNextEntry == NULL || Crc32 == NULL) {
1086 vm_exit_during_initialization("Corrupted ZIP library", path);
1087 }
1088
1089 if (ZipInflateFully == NULL) {
1090 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
1091 }
1092
1093 // Lookup canonicalize entry in libjava.dll
1094 void *javalib_handle = os::native_java_library();
1095 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
1096 // This lookup only works on 1.3. Do not check for non-null here
1097 }
1098
1099 void ClassLoader::load_jimage_library() {
1100 // First make sure native library is loaded
1101 os::native_java_library();
1102 // Load jimage library
1103 char path[JVM_MAXPATHLEN];
1104 char ebuf[1024];
1105 void* handle = NULL;
1106 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
1107 handle = os::dll_load(path, ebuf, sizeof ebuf);
1108 }
1109 if (handle == NULL) {
1110 vm_exit_during_initialization("Unable to load jimage library", path);
1111 }
1112
1113 // Lookup jimage entry points
1114 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open"));
1115 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found");
1116 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close"));
1117 guarantee(JImageClose != NULL, "function JIMAGE_Close not found");
1118 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule"));
1119 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found");
1120 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource"));
1121 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found");
1122 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource"));
1123 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found");
1124 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator"));
1125 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found");
1126 JImageResourcePath = CAST_TO_FN_PTR(JImage_ResourcePath_t, os::dll_lookup(handle, "JIMAGE_ResourcePath"));
1127 guarantee(JImageResourcePath != NULL, "function JIMAGE_ResourcePath not found");
1128 }
1129
1130 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
1131 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
1132 }
1133
1134 int ClassLoader::crc32(int crc, const char* buf, int len) {
1135 assert(Crc32 != NULL, "ZIP_CRC32 is not found");
1136 return (*Crc32)(crc, (const jbyte*)buf, len);
1137 }
1138
1139 #if INCLUDE_CDS
1140 void ClassLoader::initialize_module_loader_map(JImageFile* jimage) {
1141 if (!DumpSharedSpaces) {
1142 return; // only needed for CDS dump time
1143 }
1144
1145 ResourceMark rm;
1146 jlong size;
1147 JImageLocationRef location = (*JImageFindResource)(jimage, JAVA_BASE_NAME, get_jimage_version_string(), MODULE_LOADER_MAP, &size);
1148 if (location == 0) {
1149 vm_exit_during_initialization(
1150 "Cannot find ModuleLoaderMap location from modules jimage.", NULL);
1151 }
1152 char* buffer = NEW_RESOURCE_ARRAY(char, size + 1);
1153 buffer[size] = '\0';
1154 jlong read = (*JImageGetResource)(jimage, location, buffer, size);
1155 if (read != size) {
1156 vm_exit_during_initialization(
1157 "Cannot find ModuleLoaderMap resource from modules jimage.", NULL);
1158 }
1159 char* char_buf = (char*)buffer;
1160 int buflen = (int)strlen(char_buf);
1161 char* begin_ptr = char_buf;
1162 char* end_ptr = strchr(begin_ptr, '\n');
1163 bool process_boot_modules = false;
1164 _boot_modules_array = new (ResourceObj::C_HEAP, mtModule)
1165 GrowableArray<char*>(INITIAL_BOOT_MODULES_ARRAY_SIZE, true);
1166 _platform_modules_array = new (ResourceObj::C_HEAP, mtModule)
1167 GrowableArray<char*>(INITIAL_PLATFORM_MODULES_ARRAY_SIZE, true);
1168 while (end_ptr != NULL && (end_ptr - char_buf) < buflen) {
1169 // Allocate a buffer from the C heap to be appended to the _boot_modules_array
1170 // or the _platform_modules_array.
1171 char* temp_name = NEW_C_HEAP_ARRAY(char, (size_t)(end_ptr - begin_ptr + 1), mtInternal);
1172 strncpy(temp_name, begin_ptr, end_ptr - begin_ptr);
1173 temp_name[end_ptr - begin_ptr] = '\0';
1174 if (strncmp(temp_name, "BOOT", 4) == 0) {
1175 process_boot_modules = true;
1176 FREE_C_HEAP_ARRAY(char, temp_name);
1177 } else if (strncmp(temp_name, "PLATFORM", 8) == 0) {
1178 process_boot_modules = false;
1179 FREE_C_HEAP_ARRAY(char, temp_name);
1180 } else {
1181 // module name
1182 if (process_boot_modules) {
1183 _boot_modules_array->append(temp_name);
1184 } else {
1185 _platform_modules_array->append(temp_name);
1186 }
1187 }
1188 begin_ptr = ++end_ptr;
1189 end_ptr = strchr(begin_ptr, '\n');
1190 }
1191 }
1192 #endif
1193
1194 // Function add_package extracts the package from the fully qualified class name
1195 // and checks if the package is in the boot loader's package entry table. If so,
1196 // then it sets the classpath_index in the package entry record.
1197 //
1198 // The classpath_index field is used to find the entry on the boot loader class
1199 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
1200 // in an unnamed module. It is also used to indicate (for all packages whose
1201 // classes are loaded by the boot loader) that at least one of the package's
1202 // classes has been loaded.
1203 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) {
1204 assert(fullq_class_name != NULL, "just checking");
1205
1206 // Get package name from fully qualified class name.
1207 ResourceMark rm;
1208 const char *cp = package_from_name(fullq_class_name);
1209 if (cp != NULL) {
1210 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();
1211 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp, CHECK_false);
1212 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol);
1213 if (pkg_entry != NULL) {
1214 assert(classpath_index != -1, "Unexpected classpath_index");
1215 pkg_entry->set_classpath_index(classpath_index);
1216 } else {
1217 return false;
1218 }
1219 }
1220 return true;
1221 }
1222
1223 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1224 // Look up the name in the boot loader's package entry table.
1225 if (name != NULL) {
1226 TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL);
1227 // Look for the package entry in the boot loader's package entry table.
1228 PackageEntry* package =
1229 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1230
1231 // Return NULL if package does not exist or if no classes in that package
1232 // have been loaded.
1233 if (package != NULL && package->has_loaded_class()) {
1234 ModuleEntry* module = package->module();
1235 if (module->location() != NULL) {
1236 ResourceMark rm(THREAD);
1237 Handle ml = java_lang_String::create_from_str(
1238 module->location()->as_C_string(), THREAD);
1239 return ml();
1240 }
1241 // Return entry on boot loader class path.
1242 Handle cph = java_lang_String::create_from_str(
1243 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1244 return cph();
1245 }
1246 }
1247 return NULL;
1248 }
1249
1250 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1251 ResourceMark rm(THREAD);
1252 // List of pointers to PackageEntrys that have loaded classes.
1253 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
1254 {
1255 MutexLocker ml(Module_lock, THREAD);
1256
1257 PackageEntryTable* pe_table =
1258 ClassLoaderData::the_null_class_loader_data()->packages();
1259
1260 // Collect the packages that have at least one loaded class.
1261 for (int x = 0; x < pe_table->table_size(); x++) {
1262 for (PackageEntry* package_entry = pe_table->bucket(x);
1263 package_entry != NULL;
1264 package_entry = package_entry->next()) {
1265 if (package_entry->has_loaded_class()) {
1266 loaded_class_pkgs->append(package_entry);
1267 }
1268 }
1269 }
1270 }
1271
1272
1273 // Allocate objArray and fill with java.lang.String
1274 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1275 loaded_class_pkgs->length(), CHECK_NULL);
1276 objArrayHandle result(THREAD, r);
1277 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1278 PackageEntry* package_entry = loaded_class_pkgs->at(x);
1279 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1280 result->obj_at_put(x, str());
1281 }
1282 return result();
1283 }
1284
1285 #if INCLUDE_CDS
1286 s2 ClassLoader::module_to_classloader(const char* module_name) {
1287
1288 assert(DumpSharedSpaces, "dump time only");
1289 assert(_boot_modules_array != NULL, "_boot_modules_array is NULL");
1290 assert(_platform_modules_array != NULL, "_platform_modules_array is NULL");
1291
1292 int array_size = _boot_modules_array->length();
1293 for (int i = 0; i < array_size; i++) {
1294 if (strcmp(module_name, _boot_modules_array->at(i)) == 0) {
1295 return BOOT_LOADER;
1296 }
1297 }
1298
1299 array_size = _platform_modules_array->length();
1300 for (int i = 0; i < array_size; i++) {
1301 if (strcmp(module_name, _platform_modules_array->at(i)) == 0) {
1302 return PLATFORM_LOADER;
1303 }
1304 }
1305
1306 return APP_LOADER;
1307 }
1308
1309 s2 ClassLoader::classloader_type(Symbol* class_name, ClassPathEntry* e, int classpath_index, TRAPS) {
1310 assert(DumpSharedSpaces, "Only used for CDS dump time");
1311
1312 // obtain the classloader type based on the class name.
1313 // First obtain the package name based on the class name. Then obtain
1314 // the classloader type based on the package name from the jimage using
1315 // a jimage API. If the classloader type cannot be found from the
1316 // jimage, it is determined by the class path entry.
1317 jshort loader_type = ClassLoader::APP_LOADER;
1318 if (e->is_jrt()) {
1319 ResourceMark rm;
1320 TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK_0);
1321 if (pkg_name != NULL) {
1322 const char* pkg_name_C_string = (const char*)(pkg_name->as_C_string());
1323 ClassPathImageEntry* cpie = (ClassPathImageEntry*)e;
1324 JImageFile* jimage = cpie->jimage();
1325 char* module_name = (char*)(*JImagePackageToModule)(jimage, pkg_name_C_string);
1326 if (module_name != NULL) {
1327 loader_type = ClassLoader::module_to_classloader(module_name);
1328 }
1329 }
1330 } else if (ClassLoaderExt::is_boot_classpath(classpath_index)) {
1331 loader_type = ClassLoader::BOOT_LOADER;
1332 }
1333 return loader_type;
1334 }
1335 #endif
1336
1337 // caller needs ResourceMark
1338 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1339 int class_name_len) {
1340 assert(class_name != NULL, "invariant");
1341 assert((int)strlen(class_name) == class_name_len, "invariant");
1342
1343 static const char class_suffix[] = ".class";
1344
1345 char* const file_name = NEW_RESOURCE_ARRAY(char,
1346 class_name_len +
1347 sizeof(class_suffix)); // includes term NULL
1348
1349 strncpy(file_name, class_name, class_name_len);
1350 strncpy(&file_name[class_name_len], class_suffix, sizeof(class_suffix));
1351
1352 return file_name;
1353 }
1354
1355 ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
1356 const GrowableArray<ModuleClassPathList*>* const module_list) {
1357 int num_of_entries = module_list->length();
1358 const Symbol* class_module_name = mod_entry->name();
1359
1360 // Loop through all the modules in either the patch-module or exploded entries looking for module
1361 for (int i = 0; i < num_of_entries; i++) {
1362 ModuleClassPathList* module_cpl = module_list->at(i);
1363 Symbol* module_cpl_name = module_cpl->module_name();
1364
1365 if (module_cpl_name->fast_compare(class_module_name) == 0) {
1366 // Class' module has been located.
1367 return module_cpl->module_first_entry();
1368 }
1369 }
1370 return NULL;
1371 }
1372
1373
1374 // Search either the patch-module or exploded build entries for class.
1375 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list,
1376 const char* const class_name,
1377 const char* const file_name,
1378 TRAPS) {
1379 ClassFileStream* stream = NULL;
1380
1381 // Find the class' defining module in the boot loader's module entry table
1382 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
1383 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL;
1384
1385 // If the module system has not defined java.base yet, then
1386 // classes loaded are assumed to be defined to java.base.
1387 // When java.base is eventually defined by the module system,
1388 // all packages of classes that have been previously loaded
1389 // are verified in ModuleEntryTable::verify_javabase_packages().
1390 if (!Universe::is_module_initialized() &&
1391 !ModuleEntryTable::javabase_defined() &&
1392 mod_entry == NULL) {
1393 mod_entry = ModuleEntryTable::javabase_moduleEntry();
1394 }
1395
1396 // The module must be a named module
1397 ClassPathEntry* e = NULL;
1398 if (mod_entry != NULL && mod_entry->is_named()) {
1399 if (module_list == _exploded_entries) {
1400 // The exploded build entries can be added to at any time so a lock is
1401 // needed when searching them.
1402 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
1403 MutexLocker ml(Module_lock, THREAD);
1404 e = find_first_module_cpe(mod_entry, module_list);
1405 } else {
1406 e = find_first_module_cpe(mod_entry, module_list);
1407 }
1408 }
1409
1410 // Try to load the class from the module's ClassPathEntry list.
1411 while (e != NULL) {
1412 stream = e->open_stream(file_name, CHECK_NULL);
1413 // No context.check is required since CDS is not supported
1414 // for an exploded modules build or if --patch-module is specified.
1415 if (NULL != stream) {
1416 return stream;
1417 }
1418 e = e->next();
1419 }
1420 // If the module was located, break out even if the class was not
1421 // located successfully from that module's ClassPathEntry list.
1422 // There will not be another valid entry for that module.
1423 return NULL;
1424 }
1425
1426 InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1427 assert(name != NULL, "invariant");
1428 assert(THREAD->is_Java_thread(), "must be a JavaThread");
1429
1430 ResourceMark rm(THREAD);
1431 HandleMark hm(THREAD);
1432
1433 const char* const class_name = name->as_C_string();
1434
1435 EventMark m("loading class %s", class_name);
1436 ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion);
1437
1438 const char* const file_name = file_name_for_class_name(class_name,
1439 name->utf8_length());
1440 assert(file_name != NULL, "invariant");
1441
1442 ClassLoaderExt::Context context(class_name, file_name, THREAD);
1443
1444 // Lookup stream for parsing .class file
1445 ClassFileStream* stream = NULL;
1446 s2 classpath_index = 0;
1447 ClassPathEntry* e = NULL;
1448
1449 // If DumpSharedSpaces is true boot loader visibility boundaries are set to:
1450 // - [jimage] + [_first_append_entry to _last_append_entry] (all path entries).
1451 //
1452 // If search_append_only is true, boot loader visibility boundaries are
1453 // set to be _first_append_entry to the end. This includes:
1454 // [-Xbootclasspath/a]; [jvmti appended entries]
1455 //
1456 // If both DumpSharedSpaces and search_append_only are false, boot loader
1457 // visibility boundaries are set to be the --patch-module entries plus the base piece.
1458 // This would include:
1459 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1460 //
1461 // DumpSharedSpaces and search_append_only are mutually exclusive and cannot
1462 // be true at the same time.
1463 assert(!(DumpSharedSpaces && search_append_only), "DumpSharedSpaces and search_append_only are both true");
1464
1465 // Load Attempt #1: --patch-module
1466 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1467 // attempt to load the class from those locations specific to the module.
1468 // Specifications to --patch-module can contain a partial number of classes
1469 // that are part of the overall module definition. So if a particular class is not
1470 // found within its module specification, the search should continue to Load Attempt #2.
1471 // Note: The --patch-module entries are never searched if the boot loader's
1472 // visibility boundary is limited to only searching the append entries.
1473 if (_patch_mod_entries != NULL && !search_append_only) {
1474 // At CDS dump time, the --patch-module entries are ignored. That means a
1475 // class is still loaded from the runtime image even if it might
1476 // appear in the _patch_mod_entries. The runtime shared class visibility
1477 // check will determine if a shared class is visible based on the runtime
1478 // environemnt, including the runtime --patch-module setting.
1479 if (!DumpSharedSpaces) {
1480 stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL);
1481 }
1482 }
1483
1484 // Load Attempt #2: [jimage | exploded build]
1485 if (!search_append_only && (NULL == stream)) {
1486 if (has_jrt_entry()) {
1487 e = _jrt_entry;
1488 stream = _jrt_entry->open_stream(file_name, CHECK_NULL);
1489 if (!context.check(stream, classpath_index)) {
1490 return NULL;
1491 }
1492 } else {
1493 // Exploded build - attempt to locate class in its defining module's location.
1494 assert(_exploded_entries != NULL, "No exploded build entries present");
1495 stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL);
1496 }
1497 }
1498
1499 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1500 if ((search_append_only || DumpSharedSpaces) && (NULL == stream)) {
1501 // For the boot loader append path search, the starting classpath_index
1502 // for the appended piece is always 1 to account for either the
1503 // _jrt_entry or the _exploded_entries.
1504 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1505 classpath_index = 1;
1506
1507 e = _first_append_entry;
1508 while (e != NULL) {
1509 stream = e->open_stream(file_name, CHECK_NULL);
1510 if (!context.check(stream, classpath_index)) {
1511 return NULL;
1512 }
1513 if (NULL != stream) {
1514 break;
1515 }
1516 e = e->next();
1517 ++classpath_index;
1518 }
1519 }
1520
1521 if (NULL == stream) {
1522 if (DumpSharedSpaces) {
1523 tty->print_cr("Preload Warning: Cannot find %s", class_name);
1524 }
1525 return NULL;
1526 }
1527
1528 stream->set_verify(context.should_verify(classpath_index));
1529
1530 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1531 Handle protection_domain;
1532
1533 InstanceKlass* result = KlassFactory::create_from_stream(stream,
1534 name,
1535 loader_data,
1536 protection_domain,
1537 NULL, // host_klass
1538 NULL, // cp_patches
1539 THREAD);
1540 if (HAS_PENDING_EXCEPTION) {
1541 if (DumpSharedSpaces) {
1542 tty->print_cr("Preload Error: Failed to load %s", class_name);
1543 }
1544 return NULL;
1545 }
1546
1547 return context.record_result(name, e, classpath_index, result, THREAD);
1548 }
1549
1550 // Initialize the class loader's access to methods in libzip. Parse and
1551 // process the boot classpath into a list ClassPathEntry objects. Once
1552 // this list has been created, it must not change order (see class PackageInfo)
1553 // it can be appended to and is by jvmti and the kernel vm.
1554
1555 void ClassLoader::initialize() {
1556 EXCEPTION_MARK;
1557
1558 if (UsePerfData) {
1559 // jvmstat performance counters
1560 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1561 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1562 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1563 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1564 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1565 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1566 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1567 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1568 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1569 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1570
1571 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1572 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1573 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1574 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1575 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1576 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1577 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1578 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1579 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1580 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1581 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1582 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1583 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1584
1585
1586 // The following performance counters are added for measuring the impact
1587 // of the bug fix of 6365597. They are mainly focused on finding out
1588 // the behavior of system & user-defined classloader lock, whether
1589 // ClassLoader.loadClass/findClass is being called synchronized or not.
1590 // Also two additional counters are created to see whether 'UnsyncloadClass'
1591 // flag is being set or not and how many times load_instance_class call
1592 // fails with linkageError etc.
1593 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1594 "systemLoaderLockContentionRate");
1595 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1596 "nonSystemLoaderLockContentionRate");
1597 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1598 "jvmFindLoadedClassNoLockCalls");
1599 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1600 "jvmDefineClassNoLockCalls");
1601
1602 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1603 "jniDefineClassNoLockCalls");
1604
1605 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1606 "unsafeDefineClassCalls");
1607
1608 NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet");
1609 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1610 "loadInstanceClassFailRate");
1611
1612 // increment the isUnsyncloadClass counter if UnsyncloadClass is set.
1613 if (UnsyncloadClass) {
1614 _isUnsyncloadClass->inc();
1615 }
1616 }
1617
1618 // lookup zip library entry points
1619 load_zip_library();
1620 // lookup jimage library entry points
1621 load_jimage_library();
1622 #if INCLUDE_CDS
1623 // initialize search path
1624 if (DumpSharedSpaces) {
1625 _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
1626 }
1627 #endif
1628 setup_bootstrap_search_path();
1629 }
1630
1631 #if INCLUDE_CDS
1632 void ClassLoader::initialize_shared_path() {
1633 if (DumpSharedSpaces) {
1634 ClassLoaderExt::setup_search_paths();
1635 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1636 }
1637 }
1638 #endif
1639
1640 jlong ClassLoader::classloader_time_ms() {
1641 return UsePerfData ?
1642 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1643 }
1644
1645 jlong ClassLoader::class_init_count() {
1646 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1647 }
1648
1649 jlong ClassLoader::class_init_time_ms() {
1650 return UsePerfData ?
1651 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1652 }
1653
1654 jlong ClassLoader::class_verify_time_ms() {
1655 return UsePerfData ?
1656 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1657 }
1658
1659 jlong ClassLoader::class_link_count() {
1660 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1661 }
1662
1663 jlong ClassLoader::class_link_time_ms() {
1664 return UsePerfData ?
1665 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1666 }
1667
1668 int ClassLoader::compute_Object_vtable() {
1669 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1670 // code to determine actual value from file
1671 // Would be value '11' if finals were in vtable
1672 int JDK_1_2_Object_vtable_size = 5;
1673 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1674 }
1675
1676
1677 void classLoader_init1() {
1678 ClassLoader::initialize();
1679 }
1680
1681 // Complete the ClassPathEntry setup for the boot loader
1682 void ClassLoader::classLoader_init2(TRAPS) {
1683 // Setup the list of module/path pairs for --patch-module processing
1684 // This must be done after the SymbolTable is created in order
1685 // to use fast_compare on module names instead of a string compare.
1686 if (Arguments::get_patch_mod_prefix() != NULL) {
1687 setup_patch_mod_entries();
1688 }
1689
1690 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
1691 // to successfully determine if java.base has been patched)
1692 create_javabase();
1693
1694 // Setup the initial java.base/path pair for the exploded build entries.
1695 // As more modules are defined during module system initialization, more
1696 // entries will be added to the exploded build array.
1697 if (!has_jrt_entry()) {
1698 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds");
1699 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds");
1700 // Set up the boot loader's _exploded_entries list. Note that this gets
1701 // done before loading any classes, by the same thread that will
1702 // subsequently do the first class load. So, no lock is needed for this.
1703 assert(_exploded_entries == NULL, "Should only get initialized once");
1704 _exploded_entries = new (ResourceObj::C_HEAP, mtModule)
1705 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true);
1706 add_to_exploded_build_list(vmSymbols::java_base(), CHECK);
1707 }
1708 }
1709
1710
1711 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1712 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1713 if (CanonicalizeEntry != NULL) {
1714 JavaThread* THREAD = JavaThread::current();
1715 JNIEnv* env = THREAD->jni_environment();
1716 ResourceMark rm(THREAD);
1717
1718 // os::native_path writes into orig_copy
1719 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1720 strcpy(orig_copy, orig);
1721 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1722 return false;
1723 }
1724 } else {
1725 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1726 strncpy(out, orig, len);
1727 out[len - 1] = '\0';
1728 }
1729 return true;
1730 }
1731
1732 void ClassLoader::create_javabase() {
1733 Thread* THREAD = Thread::current();
1734
1735 // Create java.base's module entry for the boot
1736 // class loader prior to loading j.l.Ojbect.
1737 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1738
1739 // Get module entry table
1740 ModuleEntryTable* null_cld_modules = null_cld->modules();
1741 if (null_cld_modules == NULL) {
1742 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1743 }
1744
1745 {
1746 MutexLocker ml(Module_lock, THREAD);
1747 ModuleEntry* jb_module = null_cld_modules->locked_create_entry_or_null(Handle(),
1748 false, vmSymbols::java_base(), NULL, NULL, null_cld);
1749 if (jb_module == NULL) {
1750 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
1751 }
1752 ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1753 }
1754 }
1755
1756 #ifndef PRODUCT
1757
1758 // CompileTheWorld
1759 //
1760 // Iterates over all class path entries and forces compilation of all methods
1761 // in all classes found. Currently, only zip/jar archives are searched.
1762 //
1763 // The classes are loaded by the Java level bootstrap class loader, and the
1764 // initializer is called. If DelayCompilationDuringStartup is true (default),
1765 // the interpreter will run the initialization code. Note that forcing
1766 // initialization in this way could potentially lead to initialization order
1767 // problems, in which case we could just force the initialization bit to be set.
1768
1769
1770 // We need to iterate over the contents of a zip/jar file, so we replicate the
1771 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1772 // since jzfile already has a void* definition.
1773 //
1774 // Note that this is only used in debug mode.
1775 //
1776 // HotSpot integration note:
1777 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1778
1779
1780 // JDK 1.3 version
1781 typedef struct real_jzentry { /* Zip file entry */
1782 char *name; /* entry name */
1783 jint time; /* modification time */
1784 jint size; /* size of uncompressed data */
1785 jint csize; /* size of compressed data (zero if uncompressed) */
1786 jint crc; /* crc of uncompressed data */
1787 char *comment; /* optional zip file comment */
1788 jbyte *extra; /* optional extra data */
1789 jint pos; /* position of LOC header (if negative) or data */
1790 } real_jzentry;
1791
1792 typedef struct real_jzfile { /* Zip file */
1793 char *name; /* zip file name */
1794 jint refs; /* number of active references */
1795 jint fd; /* open file descriptor */
1796 void *lock; /* read lock */
1797 char *comment; /* zip file comment */
1798 char *msg; /* zip error message */
1799 void *entries; /* array of hash cells */
1800 jint total; /* total number of entries */
1801 unsigned short *table; /* Hash chain heads: indexes into entries */
1802 jint tablelen; /* number of hash eads */
1803 real_jzfile *next; /* next zip file in search list */
1804 jzentry *cache; /* we cache the most recently freed jzentry */
1805 /* Information on metadata names in META-INF directory */
1806 char **metanames; /* array of meta names (may have null names) */
1807 jint metacount; /* number of slots in metanames array */
1808 /* If there are any per-entry comments, they are in the comments array */
1809 char **comments;
1810 } real_jzfile;
1811
1812 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1813 // For now we only compile all methods in all classes in zip/jar files
1814 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1815 tty->cr();
1816 }
1817
1818 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1819 real_jzfile* zip = (real_jzfile*) _zip;
1820 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1821 tty->cr();
1822 // Iterate over all entries in zip file
1823 for (int n = 0; ; n++) {
1824 real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n));
1825 if (ze == NULL) break;
1826 ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1827 }
1828 if (HAS_PENDING_EXCEPTION) {
1829 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1830 CLEAR_PENDING_EXCEPTION;
1831 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1832 tty->print_cr("Increase class metadata storage if a limit was set");
1833 } else {
1834 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1835 }
1836 }
1837 }
1838
1839 void ClassLoader::compile_the_world() {
1840 EXCEPTION_MARK;
1841 HandleMark hm(THREAD);
1842 ResourceMark rm(THREAD);
1843
1844 assert(has_jrt_entry(), "Compile The World not supported with exploded module build");
1845
1846 // Find bootstrap loader
1847 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1848 jlong start = os::javaTimeMillis();
1849
1850 // Compile the world for the modular java runtime image
1851 _jrt_entry->compile_the_world(system_class_loader, CATCH);
1852
1853 // Iterate over all bootstrap class path appended entries
1854 ClassPathEntry* e = _first_append_entry;
1855 while (e != NULL) {
1856 assert(!e->is_jrt(), "A modular java runtime image is present on the list of appended entries");
1857 e->compile_the_world(system_class_loader, CATCH);
1858 e = e->next();
1859 }
1860 jlong end = os::javaTimeMillis();
1861 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1862 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1863 {
1864 // Print statistics as if before normal exit:
1865 extern void print_statistics();
1866 print_statistics();
1867 }
1868 vm_exit(0);
1869 }
1870
1871 int ClassLoader::_compile_the_world_class_counter = 0;
1872 int ClassLoader::_compile_the_world_method_counter = 0;
1873 static int _codecache_sweep_counter = 0;
1874
1875 // Filter out all exceptions except OOMs
1876 static void clear_pending_exception_if_not_oom(TRAPS) {
1877 if (HAS_PENDING_EXCEPTION &&
1878 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1879 CLEAR_PENDING_EXCEPTION;
1880 }
1881 // The CHECK at the caller will propagate the exception out
1882 }
1883
1884 /**
1885 * Returns if the given method should be compiled when doing compile-the-world.
1886 *
1887 * TODO: This should be a private method in a CompileTheWorld class.
1888 */
1889 static bool can_be_compiled(methodHandle m, int comp_level) {
1890 assert(CompileTheWorld, "must be");
1891
1892 // It's not valid to compile a native wrapper for MethodHandle methods
1893 // that take a MemberName appendix since the bytecode signature is not
1894 // correct.
1895 vmIntrinsics::ID iid = m->intrinsic_id();
1896 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1897 return false;
1898 }
1899
1900 return CompilationPolicy::can_be_compiled(m, comp_level);
1901 }
1902
1903 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1904 if (string_ends_with(name, ".class")) {
1905 // We have a .class file
1906 int len = (int)strlen(name);
1907 char buffer[2048];
1908 strncpy(buffer, name, len - 6);
1909 buffer[len-6] = 0;
1910 // If the file has a period after removing .class, it's not really a
1911 // valid class file. The class loader will check everything else.
1912 if (strchr(buffer, '.') == NULL) {
1913 _compile_the_world_class_counter++;
1914 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
1915
1916 // Construct name without extension
1917 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
1918 // Use loader to load and initialize class
1919 Klass* k = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
1920 if (k != NULL && !HAS_PENDING_EXCEPTION) {
1921 k->initialize(THREAD);
1922 }
1923 bool exception_occurred = HAS_PENDING_EXCEPTION;
1924 clear_pending_exception_if_not_oom(CHECK);
1925 if (CompileTheWorldPreloadClasses && k != NULL) {
1926 InstanceKlass* ik = InstanceKlass::cast(k);
1927 ConstantPool::preload_and_initialize_all_classes(ik->constants(), THREAD);
1928 if (HAS_PENDING_EXCEPTION) {
1929 // If something went wrong in preloading we just ignore it
1930 clear_pending_exception_if_not_oom(CHECK);
1931 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
1932 }
1933 }
1934
1935 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
1936 if (k == NULL || exception_occurred) {
1937 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
1938 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
1939 } else {
1940 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
1941 // Preload all classes to get around uncommon traps
1942 // Iterate over all methods in class
1943 int comp_level = CompilationPolicy::policy()->initial_compile_level();
1944 InstanceKlass* ik = InstanceKlass::cast(k);
1945 for (int n = 0; n < ik->methods()->length(); n++) {
1946 methodHandle m (THREAD, ik->methods()->at(n));
1947 if (can_be_compiled(m, comp_level)) {
1948 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
1949 // Give sweeper a chance to keep up with CTW
1950 VM_CTWThreshold op;
1951 VMThread::execute(&op);
1952 _codecache_sweep_counter = 0;
1953 }
1954 // Force compilation
1955 CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
1956 methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
1957 if (HAS_PENDING_EXCEPTION) {
1958 clear_pending_exception_if_not_oom(CHECK);
1959 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1960 } else {
1961 _compile_the_world_method_counter++;
1962 }
1963 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
1964 // Clobber the first compile and force second tier compilation
1965 CompiledMethod* nm = m->code();
1966 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1967 // Throw out the code so that the code cache doesn't fill up
1968 nm->make_not_entrant();
1969 }
1970 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
1971 methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
1972 if (HAS_PENDING_EXCEPTION) {
1973 clear_pending_exception_if_not_oom(CHECK);
1974 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1975 } else {
1976 _compile_the_world_method_counter++;
1977 }
1978 }
1979 } else {
1980 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1981 }
1982
1983 CompiledMethod* nm = m->code();
1984 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1985 // Throw out the code so that the code cache doesn't fill up
1986 nm->make_not_entrant();
1987 }
1988 }
1989 }
1990 }
1991 }
1992 }
1993 }
1994
1995 #endif //PRODUCT
1996
1997 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1998 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1999 void PerfClassTraceTime::initialize() {
2000 if (!UsePerfData) return;
2001
2002 if (_eventp != NULL) {
2003 // increment the event counter
2004 _eventp->inc();
2005 }
2006
2007 // stop the current active thread-local timer to measure inclusive time
2008 _prev_active_event = -1;
2009 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
2010 if (_timers[i].is_active()) {
2011 assert(_prev_active_event == -1, "should have only one active timer");
2012 _prev_active_event = i;
2013 _timers[i].stop();
2014 }
2015 }
2016
2017 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
2018 // start the inclusive timer if not recursively called
2019 _t.start();
2020 }
2021
2022 // start thread-local timer of the given event type
2023 if (!_timers[_event_type].is_active()) {
2024 _timers[_event_type].start();
2025 }
2026 }
2027
2028 PerfClassTraceTime::~PerfClassTraceTime() {
2029 if (!UsePerfData) return;
2030
2031 // stop the thread-local timer as the event completes
2032 // and resume the thread-local timer of the event next on the stack
2033 _timers[_event_type].stop();
2034 jlong selftime = _timers[_event_type].ticks();
2035
2036 if (_prev_active_event >= 0) {
2037 _timers[_prev_active_event].start();
2038 }
2039
2040 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
2041
2042 // increment the counters only on the leaf call
2043 _t.stop();
2044 _timep->inc(_t.ticks());
2045 if (_selftimep != NULL) {
2046 _selftimep->inc(selftime);
2047 }
2048 // add all class loading related event selftime to the accumulated time counter
2049 ClassLoader::perf_accumulated_time()->inc(selftime);
2050
2051 // reset the timer
2052 _timers[_event_type].reset();
2053 }