1 /*
2 * Copyright (c) 1997, 2018, 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 "jvm.h"
27 #include "jimage.hpp"
28 #include "classfile/classFileStream.hpp"
29 #include "classfile/classLoader.inline.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/classLoaderExt.hpp"
32 #include "classfile/javaClasses.hpp"
33 #include "classfile/moduleEntry.hpp"
34 #include "classfile/modules.hpp"
35 #include "classfile/packageEntry.hpp"
36 #include "classfile/klassFactory.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/vmSymbols.hpp"
39 #include "compiler/compileBroker.hpp"
40 #include "interpreter/bytecodeStream.hpp"
41 #include "interpreter/oopMapCache.hpp"
42 #include "logging/log.hpp"
43 #include "logging/logStream.hpp"
44 #include "logging/logTag.hpp"
45 #include "memory/allocation.inline.hpp"
46 #include "memory/filemap.hpp"
47 #include "memory/oopFactory.hpp"
48 #include "memory/resourceArea.hpp"
49 #include "memory/universe.hpp"
50 #include "oops/instanceKlass.hpp"
51 #include "oops/instanceRefKlass.hpp"
52 #include "oops/method.inline.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/handles.hpp"
60 #include "runtime/handles.inline.hpp"
61 #include "runtime/init.hpp"
62 #include "runtime/interfaceSupport.inline.hpp"
63 #include "runtime/java.hpp"
64 #include "runtime/javaCalls.hpp"
65 #include "runtime/os.inline.hpp"
66 #include "runtime/threadCritical.hpp"
67 #include "runtime/timer.hpp"
68 #include "runtime/vm_version.hpp"
69 #include "services/management.hpp"
70 #include "services/threadService.hpp"
71 #include "utilities/events.hpp"
72 #include "utilities/hashtable.inline.hpp"
73 #include "utilities/macros.hpp"
74 #if INCLUDE_CDS
75 #include "classfile/sharedPathsMiscInfo.hpp"
76 #endif
77
78 // Entry points in zip.dll for loading zip/jar file entries
79
80 typedef void * * (*ZipOpen_t)(const char *name, char **pmsg);
81 typedef void (*ZipClose_t)(jzfile *zip);
82 typedef jzentry* (*FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
83 typedef jboolean (*ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
84 typedef jzentry* (*GetNextEntry_t)(jzfile *zip, jint n);
85 typedef jboolean (*ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg);
86 typedef jint (*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::_load_instance_class_failCounter = NULL;
139
140 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = NULL;
141 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = NULL;
142 ClassPathEntry* ClassLoader::_jrt_entry = NULL;
143 ClassPathEntry* ClassLoader::_first_append_entry = NULL;
144 ClassPathEntry* ClassLoader::_last_append_entry = NULL;
145 #if INCLUDE_CDS
146 ClassPathEntry* ClassLoader::_app_classpath_entries = NULL;
147 ClassPathEntry* ClassLoader::_last_app_classpath_entry = NULL;
148 ClassPathEntry* ClassLoader::_module_path_entries = NULL;
149 ClassPathEntry* ClassLoader::_last_module_path_entry = 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 PackageEntry* ClassLoader::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 assert((_dir != NULL) && (name != NULL), "sanity");
263 size_t path_len = strlen(_dir) + strlen(name) + strlen(os::file_separator()) + 1;
264 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, path_len);
265 int len = jio_snprintf(path, path_len, "%s%s%s", _dir, os::file_separator(), name);
266 assert(len == (int)(path_len - 1), "sanity");
267 // check if file exists
268 struct stat st;
269 if (os::stat(path, &st) == 0) {
270 // found file, open it
271 int file_handle = os::open(path, 0, 0);
272 if (file_handle != -1) {
273 // read contents into resource array
274 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
275 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
276 // close file
277 os::close(file_handle);
278 // construct ClassFileStream
279 if (num_read == (size_t)st.st_size) {
280 if (UsePerfData) {
281 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
282 }
283 FREE_RESOURCE_ARRAY(char, path, path_len);
284 // Resource allocated
285 return new ClassFileStream(buffer,
286 st.st_size,
287 _dir,
288 ClassFileStream::verify);
289 }
290 }
291 }
292 FREE_RESOURCE_ARRAY(char, path, path_len);
293 return NULL;
294 }
295
296 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name, bool is_boot_append) : ClassPathEntry() {
297 _zip = zip;
298 char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
299 strcpy(copy, zip_name);
300 _zip_name = copy;
301 _is_boot_append = is_boot_append;
302 _multi_versioned = _unknown;
303 }
304
305 ClassPathZipEntry::~ClassPathZipEntry() {
306 if (ZipClose != NULL) {
307 (*ZipClose)(_zip);
308 }
309 FREE_C_HEAP_ARRAY(char, _zip_name);
310 }
311
312 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
313 // enable call to C land
314 JavaThread* thread = JavaThread::current();
315 ThreadToNativeFromVM ttn(thread);
316 // check whether zip archive contains name
317 jint name_len;
318 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
319 if (entry == NULL) return NULL;
320 u1* buffer;
321 char name_buf[128];
322 char* filename;
323 if (name_len < 128) {
324 filename = name_buf;
325 } else {
326 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
327 }
328
329 // read contents into resource array
330 int size = (*filesize) + ((nul_terminate) ? 1 : 0);
331 buffer = NEW_RESOURCE_ARRAY(u1, size);
332 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
333
334 // return result
335 if (nul_terminate) {
336 buffer[*filesize] = 0;
337 }
338 return buffer;
339 }
340
341 #if INCLUDE_CDS
342 u1* ClassPathZipEntry::open_versioned_entry(const char* name, jint* filesize, TRAPS) {
343 u1* buffer = NULL;
344 if (DumpSharedSpaces && !_is_boot_append) {
345 // We presume default is multi-release enabled
346 const char* multi_ver = Arguments::get_property("jdk.util.jar.enableMultiRelease");
347 const char* verstr = Arguments::get_property("jdk.util.jar.version");
348 bool is_multi_ver = (multi_ver == NULL ||
349 strcmp(multi_ver, "true") == 0 ||
350 strcmp(multi_ver, "force") == 0) &&
351 is_multiple_versioned(THREAD);
352 // command line version setting
353 int version = 0;
354 const int base_version = 8; // JDK8
355 int cur_ver = JDK_Version::current().major_version();
356 if (verstr != NULL) {
357 version = atoi(verstr);
358 if (version < base_version || version > cur_ver) {
359 // If the specified version is lower than the base version, the base
360 // entry will be used; if the version is higher than the current
361 // jdk version, the highest versioned entry will be used.
362 if (version < base_version) {
363 is_multi_ver = false;
364 }
365 // print out warning, do not use assertion here since it will continue to look
366 // for proper version.
367 warning("JDK%d is not supported in multiple version jars", version);
368 }
369 }
370
371 if (is_multi_ver) {
372 int n;
373 const char* version_entry = "META-INF/versions/";
374 // 10 is the max length of a decimal 32-bit non-negative number
375 // 2 includes the '/' and trailing zero
376 size_t entry_name_len = strlen(version_entry) + 10 + strlen(name) + 2;
377 char* entry_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, entry_name_len);
378 if (version > 0) {
379 n = jio_snprintf(entry_name, entry_name_len, "%s%d/%s", version_entry, version, name);
380 entry_name[n] = '\0';
381 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
382 if (buffer == NULL) {
383 warning("Could not find %s in %s, try to find highest version instead", entry_name, _zip_name);
384 }
385 }
386 if (buffer == NULL) {
387 for (int i = cur_ver; i >= base_version; i--) {
388 n = jio_snprintf(entry_name, entry_name_len, "%s%d/%s", version_entry, i, name);
389 entry_name[n] = '\0';
390 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
391 if (buffer != NULL) {
392 break;
393 }
394 }
395 }
396 FREE_RESOURCE_ARRAY(char, entry_name, entry_name_len);
397 }
398 }
399 return buffer;
400 }
401
402 bool ClassPathZipEntry::is_multiple_versioned(TRAPS) {
403 assert(DumpSharedSpaces, "called only at dump time");
404 if (_multi_versioned != _unknown) {
405 return (_multi_versioned == _yes) ? true : false;
406 }
407 jint size;
408 char* buffer = (char*)open_entry("META-INF/MANIFEST.MF", &size, true, CHECK_false);
409 if (buffer != NULL) {
410 char* p = buffer;
411 for ( ; *p; ++p) *p = tolower(*p);
412 if (strstr(buffer, "multi-release: true") != NULL) {
413 _multi_versioned = _yes;
414 return true;
415 }
416 }
417 _multi_versioned = _no;
418 return false;
419 }
420 #endif // INCLUDE_CDS
421
422 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
423 jint filesize;
424 u1* buffer = open_versioned_entry(name, &filesize, CHECK_NULL);
425 if (buffer == NULL) {
426 buffer = open_entry(name, &filesize, false, CHECK_NULL);
427 if (buffer == NULL) {
428 return NULL;
429 }
430 }
431 if (UsePerfData) {
432 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
433 }
434 // Resource allocated
435 return new ClassFileStream(buffer,
436 filesize,
437 _zip_name,
438 ClassFileStream::verify);
439 }
440
441 // invoke function for each entry in the zip file
442 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
443 JavaThread* thread = JavaThread::current();
444 HandleMark handle_mark(thread);
445 ThreadToNativeFromVM ttn(thread);
446 for (int n = 0; ; n++) {
447 jzentry * ze = ((*GetNextEntry)(_zip, n));
448 if (ze == NULL) break;
449 (*f)(ze->name, context);
450 }
451 }
452
453 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
454 ClassPathEntry(),
455 _jimage(jimage) {
456 guarantee(jimage != NULL, "jimage file is null");
457 guarantee(name != NULL, "jimage file name is null");
458 size_t len = strlen(name) + 1;
459 _name = NEW_C_HEAP_ARRAY(const char, len, mtClass);
460 strncpy((char *)_name, name, len);
461 }
462
463 ClassPathImageEntry::~ClassPathImageEntry() {
464 if (_name != NULL) {
465 FREE_C_HEAP_ARRAY(const char, _name);
466 _name = NULL;
467 }
468 if (_jimage != NULL) {
469 (*JImageClose)(_jimage);
470 _jimage = NULL;
471 }
472 }
473
474 // For a class in a named module, look it up in the jimage file using this syntax:
475 // /<module-name>/<package-name>/<base-class>
476 //
477 // Assumptions:
478 // 1. There are no unnamed modules in the jimage file.
479 // 2. A package is in at most one module in the jimage file.
480 //
481 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
482 jlong size;
483 JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size);
484
485 if (location == 0) {
486 ResourceMark rm;
487 const char* pkg_name = ClassLoader::package_from_name(name);
488
489 if (pkg_name != NULL) {
490 if (!Universe::is_module_initialized()) {
491 location = (*JImageFindResource)(_jimage, JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
492 #if INCLUDE_CDS
493 // CDS uses the boot class loader to load classes whose packages are in
494 // modules defined for other class loaders. So, for now, get their module
495 // names from the "modules" jimage file.
496 if (DumpSharedSpaces && location == 0) {
497 const char* module_name = (*JImagePackageToModule)(_jimage, pkg_name);
498 if (module_name != NULL) {
499 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
500 }
501 }
502 #endif
503
504 } else {
505 PackageEntry* package_entry = ClassLoader::get_package_entry(name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
506 if (package_entry != NULL) {
507 ResourceMark rm;
508 // Get the module name
509 ModuleEntry* module = package_entry->module();
510 assert(module != NULL, "Boot classLoader package missing module");
511 assert(module->is_named(), "Boot classLoader package is in unnamed module");
512 const char* module_name = module->name()->as_C_string();
513 if (module_name != NULL) {
514 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
515 }
516 }
517 }
518 }
519 }
520 if (location != 0) {
521 if (UsePerfData) {
522 ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
523 }
524 char* data = NEW_RESOURCE_ARRAY(char, size);
525 (*JImageGetResource)(_jimage, location, data, size);
526 // Resource allocated
527 return new ClassFileStream((u1*)data,
528 (int)size,
529 _name,
530 ClassFileStream::verify);
531 }
532
533 return NULL;
534 }
535
536 JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf,
537 const char* module_name,
538 const char* file_name,
539 jlong &size) {
540 return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size));
541 }
542
543 #ifndef PRODUCT
544 bool ctw_visitor(JImageFile* jimage,
545 const char* module_name, const char* version, const char* package,
546 const char* name, const char* extension, void* arg) {
547 if (strcmp(extension, "class") == 0) {
548 Thread* THREAD = Thread::current();
549 ResourceMark rm(THREAD);
550 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JIMAGE_MAX_PATH);
551 jio_snprintf(path, JIMAGE_MAX_PATH - 1, "%s/%s.class", package, name);
552 ClassLoader::compile_the_world_in(path, *(Handle*)arg, THREAD);
553 return !HAS_PENDING_EXCEPTION;
554 }
555 return true;
556 }
557
558 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) {
559 tty->print_cr("CompileTheWorld : Compiling all classes in %s", name());
560 tty->cr();
561 (*JImageResourceIterator)(_jimage, (JImageResourceVisitor_t)ctw_visitor, (void *)&loader);
562 if (HAS_PENDING_EXCEPTION) {
563 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
564 CLEAR_PENDING_EXCEPTION;
565 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
566 tty->print_cr("Increase class metadata storage if a limit was set");
567 } else {
568 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
569 }
570 }
571 }
572 #endif
573
574 bool ClassPathImageEntry::is_modules_image() const {
575 return ClassLoader::is_modules_image(name());
576 }
577
578 #if INCLUDE_CDS
579 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
580 assert(DumpSharedSpaces, "only called at dump time");
581 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure");
582 vm_exit_during_initialization(error, message);
583 }
584 #endif
585
586 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
587 _module_name = module_name;
588 _module_first_entry = NULL;
589 _module_last_entry = NULL;
590 }
591
592 ModuleClassPathList::~ModuleClassPathList() {
593 // Clean out each ClassPathEntry on list
594 ClassPathEntry* e = _module_first_entry;
595 while (e != NULL) {
596 ClassPathEntry* next_entry = e->next();
597 delete e;
598 e = next_entry;
599 }
600 }
601
602 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
603 if (new_entry != NULL) {
604 if (_module_last_entry == NULL) {
605 _module_first_entry = _module_last_entry = new_entry;
606 } else {
607 _module_last_entry->set_next(new_entry);
608 _module_last_entry = new_entry;
609 }
610 }
611 }
612
613 void ClassLoader::trace_class_path(const char* msg, const char* name) {
614 LogTarget(Info, class, path) lt;
615 if (lt.is_enabled()) {
616 LogStream ls(lt);
617 if (msg) {
618 ls.print("%s", msg);
619 }
620 if (name) {
621 if (strlen(name) < 256) {
622 ls.print("%s", name);
623 } else {
624 // For very long paths, we need to print each character separately,
625 // as print_cr() has a length limit
626 while (name[0] != '\0') {
627 ls.print("%c", name[0]);
628 name++;
629 }
630 }
631 }
632 ls.cr();
633 }
634 }
635
636 void ClassLoader::setup_bootstrap_search_path() {
637 const char* sys_class_path = Arguments::get_sysclasspath();
638 if (PrintSharedArchiveAndExit) {
639 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
640 // the same as the bootcp of the shared archive.
641 } else {
642 trace_class_path("bootstrap loader class path=", sys_class_path);
643 }
644 #if INCLUDE_CDS
645 if (DumpSharedSpaces) {
646 _shared_paths_misc_info->add_boot_classpath(sys_class_path);
647 }
648 #endif
649 setup_boot_search_path(sys_class_path);
650 }
651
652 #if INCLUDE_CDS
653 int ClassLoader::get_shared_paths_misc_info_size() {
654 return _shared_paths_misc_info->get_used_bytes();
655 }
656
657 void* ClassLoader::get_shared_paths_misc_info() {
658 return _shared_paths_misc_info->buffer();
659 }
660
661 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
662 SharedPathsMiscInfo* checker = new SharedPathsMiscInfo((char*)buf, size);
663 bool result = checker->check();
664 delete checker;
665 return result;
666 }
667
668 void ClassLoader::setup_app_search_path(const char *class_path) {
669
670 assert(DumpSharedSpaces, "Sanity");
671
672 Thread* THREAD = Thread::current();
673 int len = (int)strlen(class_path);
674 int end = 0;
675
676 // Iterate over class path entries
677 for (int start = 0; start < len; start = end) {
678 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
679 end++;
680 }
681 EXCEPTION_MARK;
682 ResourceMark rm(THREAD);
683 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
684 strncpy(path, &class_path[start], end - start);
685 path[end - start] = '\0';
686
687 update_class_path_entry_list(path, false, false);
688
689 while (class_path[end] == os::path_separator()[0]) {
690 end++;
691 }
692 }
693 }
694
695 void ClassLoader::add_to_module_path_entries(const char* path,
696 ClassPathEntry* entry) {
697 assert(entry != NULL, "ClassPathEntry should not be NULL");
698 assert(DumpSharedSpaces, "dump time only");
699
700 // The entry does not exist, add to the list
701 if (_module_path_entries == NULL) {
702 assert(_last_module_path_entry == NULL, "Sanity");
703 _module_path_entries = _last_module_path_entry = entry;
704 } else {
705 _last_module_path_entry->set_next(entry);
706 _last_module_path_entry = entry;
707 }
708 }
709
710 // Add a module path to the _module_path_entries list.
711 void ClassLoader::update_module_path_entry_list(const char *path, TRAPS) {
712 assert(DumpSharedSpaces, "dump time only");
713 struct stat st;
714 if (os::stat(path, &st) != 0) {
715 tty->print_cr("os::stat error %d (%s). CDS dump aborted. Bad path %s",
716 errno, os::errno_name(errno), path);
717 exit(1);
718 }
719 // File or directory found
720 ClassPathEntry* new_entry = NULL;
721 new_entry = create_class_path_entry(path, &st, true /* throw_exception */,
722 false /*is_boot_append */, CHECK);
723 if (new_entry == NULL) {
724 return;
725 }
726
727 add_to_module_path_entries(path, new_entry);
728 return;
729 }
730
731 void ClassLoader::setup_module_search_path(const char* path, TRAPS) {
732 update_module_path_entry_list(path, THREAD);
733 }
734 #endif // INCLUDE_CDS
735
736 // Construct the array of module/path pairs as specified to --patch-module
737 // for the boot loader to search ahead of the jimage, if the class being
738 // loaded is defined to a module that has been specified to --patch-module.
739 void ClassLoader::setup_patch_mod_entries() {
740 Thread* THREAD = Thread::current();
741 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
742 int num_of_entries = patch_mod_args->length();
743
744
745 // Set up the boot loader's _patch_mod_entries list
746 _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true);
747
748 for (int i = 0; i < num_of_entries; i++) {
749 const char* module_name = (patch_mod_args->at(i))->module_name();
750 Symbol* const module_sym = SymbolTable::lookup(module_name, (int)strlen(module_name), CHECK);
751 assert(module_sym != NULL, "Failed to obtain Symbol for module name");
752 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
753
754 char* class_path = (patch_mod_args->at(i))->path_string();
755 int len = (int)strlen(class_path);
756 int end = 0;
757 // Iterate over the module's class path entries
758 for (int start = 0; start < len; start = end) {
759 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
760 end++;
761 }
762 EXCEPTION_MARK;
763 ResourceMark rm(THREAD);
764 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
765 strncpy(path, &class_path[start], end - start);
766 path[end - start] = '\0';
767
768 struct stat st;
769 if (os::stat(path, &st) == 0) {
770 // File or directory found
771 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
772 // If the path specification is valid, enter it into this module's list
773 if (new_entry != NULL) {
774 module_cpl->add_to_list(new_entry);
775 }
776 }
777
778 while (class_path[end] == os::path_separator()[0]) {
779 end++;
780 }
781 }
782
783 // Record the module into the list of --patch-module entries only if
784 // valid ClassPathEntrys have been created
785 if (module_cpl->module_first_entry() != NULL) {
786 _patch_mod_entries->push(module_cpl);
787 }
788 }
789 }
790
791 // Determine whether the module has been patched via the command-line
792 // option --patch-module
793 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
794 if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) {
795 int table_len = _patch_mod_entries->length();
796 for (int i = 0; i < table_len; i++) {
797 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
798 if (module_name->fast_compare(patch_mod->module_name()) == 0) {
799 return true;
800 }
801 }
802 }
803 return false;
804 }
805
806 // Set up the _jrt_entry if present and boot append path
807 void ClassLoader::setup_boot_search_path(const char *class_path) {
808 int len = (int)strlen(class_path);
809 int end = 0;
810 bool set_base_piece = true;
811
812 #if INCLUDE_CDS
813 if (DumpSharedSpaces) {
814 if (!Arguments::has_jimage()) {
815 vm_exit_during_initialization("CDS is not supported in exploded JDK build", NULL);
816 }
817 }
818 #endif
819
820 // Iterate over class path entries
821 for (int start = 0; start < len; start = end) {
822 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
823 end++;
824 }
825 EXCEPTION_MARK;
826 ResourceMark rm(THREAD);
827 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
828 strncpy(path, &class_path[start], end - start);
829 path[end - start] = '\0';
830
831 if (set_base_piece) {
832 // The first time through the bootstrap_search setup, it must be determined
833 // what the base or core piece of the boot loader search is. Either a java runtime
834 // image is present or this is an exploded module build situation.
835 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
836 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
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 // Check for a jimage
843 if (Arguments::has_jimage()) {
844 assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice");
845 assert(new_entry != NULL && new_entry->is_modules_image(), "No java runtime image present");
846 _jrt_entry = new_entry;
847 assert(_jrt_entry->jimage() != NULL, "No java runtime image");
848 }
849 } else {
850 // If path does not exist, exit
851 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
852 }
853 set_base_piece = false;
854 } else {
855 // Every entry on the system boot class path after the initial base piece,
856 // which is set by os::set_boot_path(), is considered an appended entry.
857 update_class_path_entry_list(path, false, true);
858 }
859
860 while (class_path[end] == os::path_separator()[0]) {
861 end++;
862 }
863 }
864 }
865
866 // During an exploded modules build, each module defined to the boot loader
867 // will be added to the ClassLoader::_exploded_entries array.
868 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) {
869 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
870 assert(_exploded_entries != NULL, "_exploded_entries was not initialized");
871
872 // Find the module's symbol
873 ResourceMark rm(THREAD);
874 const char *module_name = module_sym->as_C_string();
875 const char *home = Arguments::get_java_home();
876 const char file_sep = os::file_separator()[0];
877 // 10 represents the length of "modules" + 2 file separators + \0
878 size_t len = strlen(home) + strlen(module_name) + 10;
879 char *path = NEW_RESOURCE_ARRAY(char, len);
880 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
881
882 struct stat st;
883 if (os::stat(path, &st) == 0) {
884 // Directory found
885 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
886
887 // If the path specification is valid, enter it into this module's list.
888 // There is no need to check for duplicate modules in the exploded entry list,
889 // since no two modules with the same name can be defined to the boot loader.
890 // This is checked at module definition time in Modules::define_module.
891 if (new_entry != NULL) {
892 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
893 module_cpl->add_to_list(new_entry);
894 {
895 MutexLocker ml(Module_lock, THREAD);
896 _exploded_entries->push(module_cpl);
897 }
898 log_info(class, load)("path: %s", path);
899 }
900 }
901 }
902
903 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
904 bool throw_exception,
905 bool is_boot_append, TRAPS) {
906 JavaThread* thread = JavaThread::current();
907 ClassPathEntry* new_entry = NULL;
908 if ((st->st_mode & S_IFMT) == S_IFREG) {
909 ResourceMark rm(thread);
910 // Regular file, should be a zip or jimage file
911 // Canonicalized filename
912 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
913 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
914 // This matches the classic VM
915 if (throw_exception) {
916 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
917 } else {
918 return NULL;
919 }
920 }
921 jint error;
922 JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
923 if (jimage != NULL) {
924 new_entry = new ClassPathImageEntry(jimage, canonical_path);
925 } else {
926 char* error_msg = NULL;
927 jzfile* zip;
928 {
929 // enable call to C land
930 ThreadToNativeFromVM ttn(thread);
931 HandleMark hm(thread);
932 zip = (*ZipOpen)(canonical_path, &error_msg);
933 }
934 if (zip != NULL && error_msg == NULL) {
935 new_entry = new ClassPathZipEntry(zip, path, is_boot_append);
936 } else {
937 char *msg;
938 if (error_msg == NULL) {
939 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ;
940 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
941 } else {
942 int len = (int)(strlen(path) + strlen(error_msg) + 128);
943 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ;
944 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
945 }
946 // Don't complain about bad jar files added via -Xbootclasspath/a:.
947 if (throw_exception && is_init_completed()) {
948 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
949 } else {
950 return NULL;
951 }
952 }
953 }
954 log_info(class, path)("opened: %s", path);
955 log_info(class, load)("opened: %s", path);
956 } else {
957 // Directory
958 new_entry = new ClassPathDirEntry(path);
959 log_info(class, load)("path: %s", path);
960 }
961 return new_entry;
962 }
963
964
965 // Create a class path zip entry for a given path (return NULL if not found
966 // or zip/JAR file cannot be opened)
967 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
968 // check for a regular file
969 struct stat st;
970 if (os::stat(path, &st) == 0) {
971 if ((st.st_mode & S_IFMT) == S_IFREG) {
972 char canonical_path[JVM_MAXPATHLEN];
973 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
974 char* error_msg = NULL;
975 jzfile* zip;
976 {
977 // enable call to C land
978 JavaThread* thread = JavaThread::current();
979 ThreadToNativeFromVM ttn(thread);
980 HandleMark hm(thread);
981 zip = (*ZipOpen)(canonical_path, &error_msg);
982 }
983 if (zip != NULL && error_msg == NULL) {
984 // create using canonical path
985 return new ClassPathZipEntry(zip, canonical_path, is_boot_append);
986 }
987 }
988 }
989 }
990 return NULL;
991 }
992
993 // returns true if entry already on class path
994 bool ClassLoader::contains_append_entry(const char* name) {
995 ClassPathEntry* e = _first_append_entry;
996 while (e != NULL) {
997 // assume zip entries have been canonicalized
998 if (strcmp(name, e->name()) == 0) {
999 return true;
1000 }
1001 e = e->next();
1002 }
1003 return false;
1004 }
1005
1006 void ClassLoader::add_to_boot_append_entries(ClassPathEntry *new_entry) {
1007 if (new_entry != NULL) {
1008 if (_last_append_entry == NULL) {
1009 assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty");
1010 _first_append_entry = _last_append_entry = new_entry;
1011 } else {
1012 _last_append_entry->set_next(new_entry);
1013 _last_append_entry = new_entry;
1014 }
1015 }
1016 }
1017
1018 // Record the path entries specified in -cp during dump time. The recorded
1019 // information will be used at runtime for loading the archived app classes.
1020 //
1021 // Note that at dump time, ClassLoader::_app_classpath_entries are NOT used for
1022 // loading app classes. Instead, the app class are loaded by the
1023 // jdk/internal/loader/ClassLoaders$AppClassLoader instance.
1024 void ClassLoader::add_to_app_classpath_entries(const char* path,
1025 ClassPathEntry* entry,
1026 bool check_for_duplicates) {
1027 #if INCLUDE_CDS
1028 assert(entry != NULL, "ClassPathEntry should not be NULL");
1029 ClassPathEntry* e = _app_classpath_entries;
1030 if (check_for_duplicates) {
1031 while (e != NULL) {
1032 if (strcmp(e->name(), entry->name()) == 0) {
1033 // entry already exists
1034 return;
1035 }
1036 e = e->next();
1037 }
1038 }
1039
1040 // The entry does not exist, add to the list
1041 if (_app_classpath_entries == NULL) {
1042 assert(_last_app_classpath_entry == NULL, "Sanity");
1043 _app_classpath_entries = _last_app_classpath_entry = entry;
1044 } else {
1045 _last_app_classpath_entry->set_next(entry);
1046 _last_app_classpath_entry = entry;
1047 }
1048
1049 if (entry->is_jar_file()) {
1050 ClassLoaderExt::process_jar_manifest(entry, check_for_duplicates);
1051 }
1052 #endif
1053 }
1054
1055 // Returns true IFF the file/dir exists and the entry was successfully created.
1056 bool ClassLoader::update_class_path_entry_list(const char *path,
1057 bool check_for_duplicates,
1058 bool is_boot_append,
1059 bool throw_exception) {
1060 struct stat st;
1061 if (os::stat(path, &st) == 0) {
1062 // File or directory found
1063 ClassPathEntry* new_entry = NULL;
1064 Thread* THREAD = Thread::current();
1065 new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false));
1066 if (new_entry == NULL) {
1067 return false;
1068 }
1069
1070 // Do not reorder the bootclasspath which would break get_system_package().
1071 // Add new entry to linked list
1072 if (is_boot_append) {
1073 add_to_boot_append_entries(new_entry);
1074 } else {
1075 add_to_app_classpath_entries(path, new_entry, check_for_duplicates);
1076 }
1077 return true;
1078 } else {
1079 #if INCLUDE_CDS
1080 if (DumpSharedSpaces) {
1081 _shared_paths_misc_info->add_nonexist_path(path);
1082 }
1083 #endif
1084 return false;
1085 }
1086 }
1087
1088 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
1089 ResourceMark rm;
1090 int num_of_entries = module_list->length();
1091 for (int i = 0; i < num_of_entries; i++) {
1092 ClassPathEntry* e;
1093 ModuleClassPathList* mpl = module_list->at(i);
1094 tty->print("%s=", mpl->module_name()->as_C_string());
1095 e = mpl->module_first_entry();
1096 while (e != NULL) {
1097 tty->print("%s", e->name());
1098 e = e->next();
1099 if (e != NULL) {
1100 tty->print("%s", os::path_separator());
1101 }
1102 }
1103 tty->print(" ;");
1104 }
1105 }
1106
1107 void ClassLoader::print_bootclasspath() {
1108 ClassPathEntry* e;
1109 tty->print("[bootclasspath= ");
1110
1111 // Print --patch-module module/path specifications first
1112 if (_patch_mod_entries != NULL) {
1113 print_module_entry_table(_patch_mod_entries);
1114 }
1115
1116 // [jimage | exploded modules build]
1117 if (has_jrt_entry()) {
1118 // Print the location of the java runtime image
1119 tty->print("%s ;", _jrt_entry->name());
1120 } else {
1121 // Print exploded module build path specifications
1122 if (_exploded_entries != NULL) {
1123 print_module_entry_table(_exploded_entries);
1124 }
1125 }
1126
1127 // appended entries
1128 e = _first_append_entry;
1129 while (e != NULL) {
1130 tty->print("%s ;", e->name());
1131 e = e->next();
1132 }
1133 tty->print_cr("]");
1134 }
1135
1136 void ClassLoader::load_zip_library() {
1137 assert(ZipOpen == NULL, "should not load zip library twice");
1138 // First make sure native library is loaded
1139 os::native_java_library();
1140 // Load zip library
1141 char path[JVM_MAXPATHLEN];
1142 char ebuf[1024];
1143 void* handle = NULL;
1144 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
1145 handle = os::dll_load(path, ebuf, sizeof ebuf);
1146 }
1147 if (handle == NULL) {
1148 vm_exit_during_initialization("Unable to load ZIP library", path);
1149 }
1150 // Lookup zip entry points
1151 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
1152 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
1153 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
1154 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
1155 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
1156 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
1157 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
1158
1159 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
1160 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
1161 GetNextEntry == NULL || Crc32 == NULL) {
1162 vm_exit_during_initialization("Corrupted ZIP library", path);
1163 }
1164
1165 if (ZipInflateFully == NULL) {
1166 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
1167 }
1168
1169 // Lookup canonicalize entry in libjava.dll
1170 void *javalib_handle = os::native_java_library();
1171 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
1172 // This lookup only works on 1.3. Do not check for non-null here
1173 }
1174
1175 void ClassLoader::load_jimage_library() {
1176 // First make sure native library is loaded
1177 os::native_java_library();
1178 // Load jimage library
1179 char path[JVM_MAXPATHLEN];
1180 char ebuf[1024];
1181 void* handle = NULL;
1182 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
1183 handle = os::dll_load(path, ebuf, sizeof ebuf);
1184 }
1185 if (handle == NULL) {
1186 vm_exit_during_initialization("Unable to load jimage library", path);
1187 }
1188
1189 // Lookup jimage entry points
1190 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open"));
1191 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found");
1192 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close"));
1193 guarantee(JImageClose != NULL, "function JIMAGE_Close not found");
1194 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule"));
1195 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found");
1196 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource"));
1197 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found");
1198 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource"));
1199 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found");
1200 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator"));
1201 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found");
1202 JImageResourcePath = CAST_TO_FN_PTR(JImage_ResourcePath_t, os::dll_lookup(handle, "JIMAGE_ResourcePath"));
1203 guarantee(JImageResourcePath != NULL, "function JIMAGE_ResourcePath not found");
1204 }
1205
1206 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
1207 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
1208 }
1209
1210 int ClassLoader::crc32(int crc, const char* buf, int len) {
1211 assert(Crc32 != NULL, "ZIP_CRC32 is not found");
1212 return (*Crc32)(crc, (const jbyte*)buf, len);
1213 }
1214
1215 // Function add_package extracts the package from the fully qualified class name
1216 // and checks if the package is in the boot loader's package entry table. If so,
1217 // then it sets the classpath_index in the package entry record.
1218 //
1219 // The classpath_index field is used to find the entry on the boot loader class
1220 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
1221 // in an unnamed module. It is also used to indicate (for all packages whose
1222 // classes are loaded by the boot loader) that at least one of the package's
1223 // classes has been loaded.
1224 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) {
1225 assert(fullq_class_name != NULL, "just checking");
1226
1227 // Get package name from fully qualified class name.
1228 ResourceMark rm;
1229 const char *cp = package_from_name(fullq_class_name);
1230 if (cp != NULL) {
1231 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();
1232 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp, CHECK_false);
1233 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol);
1234 if (pkg_entry != NULL) {
1235 assert(classpath_index != -1, "Unexpected classpath_index");
1236 pkg_entry->set_classpath_index(classpath_index);
1237 } else {
1238 return false;
1239 }
1240 }
1241 return true;
1242 }
1243
1244 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1245 // Look up the name in the boot loader's package entry table.
1246 if (name != NULL) {
1247 TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL);
1248 // Look for the package entry in the boot loader's package entry table.
1249 PackageEntry* package =
1250 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1251
1252 // Return NULL if package does not exist or if no classes in that package
1253 // have been loaded.
1254 if (package != NULL && package->has_loaded_class()) {
1255 ModuleEntry* module = package->module();
1256 if (module->location() != NULL) {
1257 ResourceMark rm(THREAD);
1258 Handle ml = java_lang_String::create_from_str(
1259 module->location()->as_C_string(), THREAD);
1260 return ml();
1261 }
1262 // Return entry on boot loader class path.
1263 Handle cph = java_lang_String::create_from_str(
1264 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1265 return cph();
1266 }
1267 }
1268 return NULL;
1269 }
1270
1271 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1272 ResourceMark rm(THREAD);
1273 // List of pointers to PackageEntrys that have loaded classes.
1274 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
1275 {
1276 MutexLocker ml(Module_lock, THREAD);
1277
1278 PackageEntryTable* pe_table =
1279 ClassLoaderData::the_null_class_loader_data()->packages();
1280
1281 // Collect the packages that have at least one loaded class.
1282 for (int x = 0; x < pe_table->table_size(); x++) {
1283 for (PackageEntry* package_entry = pe_table->bucket(x);
1284 package_entry != NULL;
1285 package_entry = package_entry->next()) {
1286 if (package_entry->has_loaded_class()) {
1287 loaded_class_pkgs->append(package_entry);
1288 }
1289 }
1290 }
1291 }
1292
1293
1294 // Allocate objArray and fill with java.lang.String
1295 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1296 loaded_class_pkgs->length(), CHECK_NULL);
1297 objArrayHandle result(THREAD, r);
1298 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1299 PackageEntry* package_entry = loaded_class_pkgs->at(x);
1300 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1301 result->obj_at_put(x, str());
1302 }
1303 return result();
1304 }
1305
1306 // caller needs ResourceMark
1307 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1308 int class_name_len) {
1309 assert(class_name != NULL, "invariant");
1310 assert((int)strlen(class_name) == class_name_len, "invariant");
1311
1312 static const char class_suffix[] = ".class";
1313
1314 char* const file_name = NEW_RESOURCE_ARRAY(char,
1315 class_name_len +
1316 sizeof(class_suffix)); // includes term NULL
1317
1318 strncpy(file_name, class_name, class_name_len);
1319 strncpy(&file_name[class_name_len], class_suffix, sizeof(class_suffix));
1320
1321 return file_name;
1322 }
1323
1324 ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
1325 const GrowableArray<ModuleClassPathList*>* const module_list) {
1326 int num_of_entries = module_list->length();
1327 const Symbol* class_module_name = mod_entry->name();
1328
1329 // Loop through all the modules in either the patch-module or exploded entries looking for module
1330 for (int i = 0; i < num_of_entries; i++) {
1331 ModuleClassPathList* module_cpl = module_list->at(i);
1332 Symbol* module_cpl_name = module_cpl->module_name();
1333
1334 if (module_cpl_name->fast_compare(class_module_name) == 0) {
1335 // Class' module has been located.
1336 return module_cpl->module_first_entry();
1337 }
1338 }
1339 return NULL;
1340 }
1341
1342
1343 // Search either the patch-module or exploded build entries for class.
1344 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list,
1345 const char* const class_name,
1346 const char* const file_name,
1347 TRAPS) {
1348 ClassFileStream* stream = NULL;
1349
1350 // Find the class' defining module in the boot loader's module entry table
1351 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
1352 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL;
1353
1354 // If the module system has not defined java.base yet, then
1355 // classes loaded are assumed to be defined to java.base.
1356 // When java.base is eventually defined by the module system,
1357 // all packages of classes that have been previously loaded
1358 // are verified in ModuleEntryTable::verify_javabase_packages().
1359 if (!Universe::is_module_initialized() &&
1360 !ModuleEntryTable::javabase_defined() &&
1361 mod_entry == NULL) {
1362 mod_entry = ModuleEntryTable::javabase_moduleEntry();
1363 }
1364
1365 // The module must be a named module
1366 ClassPathEntry* e = NULL;
1367 if (mod_entry != NULL && mod_entry->is_named()) {
1368 if (module_list == _exploded_entries) {
1369 // The exploded build entries can be added to at any time so a lock is
1370 // needed when searching them.
1371 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
1372 MutexLocker ml(Module_lock, THREAD);
1373 e = find_first_module_cpe(mod_entry, module_list);
1374 } else {
1375 e = find_first_module_cpe(mod_entry, module_list);
1376 }
1377 }
1378
1379 // Try to load the class from the module's ClassPathEntry list.
1380 while (e != NULL) {
1381 stream = e->open_stream(file_name, CHECK_NULL);
1382 // No context.check is required since CDS is not supported
1383 // for an exploded modules build or if --patch-module is specified.
1384 if (NULL != stream) {
1385 return stream;
1386 }
1387 e = e->next();
1388 }
1389 // If the module was located, break out even if the class was not
1390 // located successfully from that module's ClassPathEntry list.
1391 // There will not be another valid entry for that module.
1392 return NULL;
1393 }
1394
1395 // Called by the boot classloader to load classes
1396 InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1397 assert(name != NULL, "invariant");
1398 assert(THREAD->is_Java_thread(), "must be a JavaThread");
1399
1400 ResourceMark rm(THREAD);
1401 HandleMark hm(THREAD);
1402
1403 const char* const class_name = name->as_C_string();
1404
1405 EventMark m("loading class %s", class_name);
1406
1407 const char* const file_name = file_name_for_class_name(class_name,
1408 name->utf8_length());
1409 assert(file_name != NULL, "invariant");
1410
1411 // Lookup stream for parsing .class file
1412 ClassFileStream* stream = NULL;
1413 s2 classpath_index = 0;
1414 ClassPathEntry* e = NULL;
1415
1416 // If DumpSharedSpaces is true boot loader visibility boundaries are set to:
1417 // - [jimage] + [_first_append_entry to _last_append_entry] (all path entries).
1418 //
1419 // If search_append_only is true, boot loader visibility boundaries are
1420 // set to be _first_append_entry to the end. This includes:
1421 // [-Xbootclasspath/a]; [jvmti appended entries]
1422 //
1423 // If both DumpSharedSpaces and search_append_only are false, boot loader
1424 // visibility boundaries are set to be the --patch-module entries plus the base piece.
1425 // This would include:
1426 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1427 //
1428
1429 // Load Attempt #1: --patch-module
1430 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1431 // attempt to load the class from those locations specific to the module.
1432 // Specifications to --patch-module can contain a partial number of classes
1433 // that are part of the overall module definition. So if a particular class is not
1434 // found within its module specification, the search should continue to Load Attempt #2.
1435 // Note: The --patch-module entries are never searched if the boot loader's
1436 // visibility boundary is limited to only searching the append entries.
1437 if (_patch_mod_entries != NULL && !search_append_only) {
1438 // At CDS dump time, the --patch-module entries are ignored. That means a
1439 // class is still loaded from the runtime image even if it might
1440 // appear in the _patch_mod_entries. The runtime shared class visibility
1441 // check will determine if a shared class is visible based on the runtime
1442 // environemnt, including the runtime --patch-module setting.
1443 if (!DumpSharedSpaces) {
1444 stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL);
1445 }
1446 }
1447
1448 // Load Attempt #2: [jimage | exploded build]
1449 if (!search_append_only && (NULL == stream)) {
1450 if (has_jrt_entry()) {
1451 e = _jrt_entry;
1452 stream = _jrt_entry->open_stream(file_name, CHECK_NULL);
1453 } else {
1454 // Exploded build - attempt to locate class in its defining module's location.
1455 assert(_exploded_entries != NULL, "No exploded build entries present");
1456 stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL);
1457 }
1458 }
1459
1460 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1461 if ((search_append_only || DumpSharedSpaces) && (NULL == stream)) {
1462 // For the boot loader append path search, the starting classpath_index
1463 // for the appended piece is always 1 to account for either the
1464 // _jrt_entry or the _exploded_entries.
1465 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1466 classpath_index = 1;
1467
1468 e = _first_append_entry;
1469 while (e != NULL) {
1470 stream = e->open_stream(file_name, CHECK_NULL);
1471 if (NULL != stream) {
1472 break;
1473 }
1474 e = e->next();
1475 ++classpath_index;
1476 }
1477 }
1478
1479 if (NULL == stream) {
1480 return NULL;
1481 }
1482
1483 stream->set_verify(ClassLoaderExt::should_verify(classpath_index));
1484
1485 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1486 Handle protection_domain;
1487
1488 InstanceKlass* result = KlassFactory::create_from_stream(stream,
1489 name,
1490 loader_data,
1491 protection_domain,
1492 NULL, // host_klass
1493 NULL, // cp_patches
1494 THREAD);
1495 if (HAS_PENDING_EXCEPTION) {
1496 if (DumpSharedSpaces) {
1497 tty->print_cr("Preload Error: Failed to load %s", class_name);
1498 }
1499 return NULL;
1500 }
1501
1502 if (!add_package(file_name, classpath_index, THREAD)) {
1503 return NULL;
1504 }
1505
1506 return result;
1507 }
1508
1509 #if INCLUDE_CDS
1510 char* ClassLoader::skip_uri_protocol(char* source) {
1511 if (strncmp(source, "file:", 5) == 0) {
1512 // file: protocol path could start with file:/ or file:///
1513 // locate the char after all the forward slashes
1514 int offset = 5;
1515 while (*(source + offset) == '/') {
1516 offset++;
1517 }
1518 source += offset;
1519 // for non-windows platforms, move back one char as the path begins with a '/'
1520 #ifndef _WINDOWS
1521 source -= 1;
1522 #endif
1523 } else if (strncmp(source, "jrt:/", 5) == 0) {
1524 source += 5;
1525 }
1526 return source;
1527 }
1528
1529 // Record the shared classpath index and loader type for classes loaded
1530 // by the builtin loaders at dump time.
1531 void ClassLoader::record_result(InstanceKlass* ik, const ClassFileStream* stream, TRAPS) {
1532 assert(DumpSharedSpaces, "sanity");
1533 assert(stream != NULL, "sanity");
1534
1535 if (ik->is_anonymous()) {
1536 // We do not archive anonymous classes.
1537 return;
1538 }
1539
1540 oop loader = ik->class_loader();
1541 char* src = (char*)stream->source();
1542 if (src == NULL) {
1543 if (loader == NULL) {
1544 // JFR classes
1545 ik->set_shared_classpath_index(0);
1546 ik->set_class_loader_type(ClassLoader::BOOT_LOADER);
1547 }
1548 return;
1549 }
1550
1551 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build");
1552
1553 ResourceMark rm(THREAD);
1554 int classpath_index = -1;
1555 PackageEntry* pkg_entry = ik->package();
1556
1557 if (FileMapInfo::get_number_of_shared_paths() > 0) {
1558 char* canonical_path_table_entry = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
1559
1560 // save the path from the file: protocol or the module name from the jrt: protocol
1561 // if no protocol prefix is found, path is the same as stream->source()
1562 char* path = skip_uri_protocol(src);
1563 char* canonical_class_src_path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
1564 if (!get_canonical_path(path, canonical_class_src_path, JVM_MAXPATHLEN)) {
1565 tty->print_cr("Bad pathname %s. CDS dump aborted.", path);
1566 vm_exit(1);
1567 }
1568 for (int i = 0; i < FileMapInfo::get_number_of_shared_paths(); i++) {
1569 SharedClassPathEntry* ent = FileMapInfo::shared_path(i);
1570 if (!get_canonical_path(ent->name(), canonical_path_table_entry, JVM_MAXPATHLEN)) {
1571 tty->print_cr("Bad pathname %s. CDS dump aborted.", ent->name());
1572 vm_exit(1);
1573 }
1574 // If the path (from the class stream source) is the same as the shared
1575 // class or module path, then we have a match.
1576 if (strcmp(canonical_path_table_entry, canonical_class_src_path) == 0) {
1577 // NULL pkg_entry and pkg_entry in an unnamed module implies the class
1578 // is from the -cp or boot loader append path which consists of -Xbootclasspath/a
1579 // and jvmti appended entries.
1580 if ((pkg_entry == NULL) || (pkg_entry->in_unnamed_module())) {
1581 // Ensure the index is within the -cp range before assigning
1582 // to the classpath_index.
1583 if (SystemDictionary::is_system_class_loader(loader) &&
1584 (i >= ClassLoaderExt::app_class_paths_start_index()) &&
1585 (i < ClassLoaderExt::app_module_paths_start_index())) {
1586 classpath_index = i;
1587 break;
1588 } else {
1589 if ((i >= 1) &&
1590 (i < ClassLoaderExt::app_class_paths_start_index())) {
1591 // The class must be from boot loader append path which consists of
1592 // -Xbootclasspath/a and jvmti appended entries.
1593 assert(loader == NULL, "sanity");
1594 classpath_index = i;
1595 break;
1596 }
1597 }
1598 } else {
1599 // A class from a named module from the --module-path. Ensure the index is
1600 // within the --module-path range before assigning to the classpath_index.
1601 if ((pkg_entry != NULL) && !(pkg_entry->in_unnamed_module()) && (i > 0)) {
1602 if (i >= ClassLoaderExt::app_module_paths_start_index() &&
1603 i < FileMapInfo::get_number_of_shared_paths()) {
1604 classpath_index = i;
1605 break;
1606 }
1607 }
1608 }
1609 }
1610 // for index 0 and the stream->source() is the modules image or has the jrt: protocol.
1611 // The class must be from the runtime modules image.
1612 if (i == 0 && (is_modules_image(src) || string_starts_with(src, "jrt:"))) {
1613 classpath_index = i;
1614 break;
1615 }
1616 }
1617
1618 // No path entry found for this class. Must be a shared class loaded by the
1619 // user defined classloader.
1620 if (classpath_index < 0) {
1621 assert(ik->shared_classpath_index() < 0, "Sanity");
1622 return;
1623 }
1624 } else {
1625 // The shared path table is set up after module system initialization.
1626 // The path table contains no entry before that. Any classes loaded prior
1627 // to the setup of the shared path table must be from the modules image.
1628 assert(is_modules_image(src), "stream must be from modules image");
1629 assert(FileMapInfo::get_number_of_shared_paths() == 0, "shared path table must not have been setup");
1630 classpath_index = 0;
1631 }
1632
1633 const char* const class_name = ik->name()->as_C_string();
1634 const char* const file_name = file_name_for_class_name(class_name,
1635 ik->name()->utf8_length());
1636 assert(file_name != NULL, "invariant");
1637
1638 ClassLoaderExt::record_result(classpath_index, ik, THREAD);
1639 }
1640 #endif // INCLUDE_CDS
1641
1642 // Initialize the class loader's access to methods in libzip. Parse and
1643 // process the boot classpath into a list ClassPathEntry objects. Once
1644 // this list has been created, it must not change order (see class PackageInfo)
1645 // it can be appended to and is by jvmti and the kernel vm.
1646
1647 void ClassLoader::initialize() {
1648 EXCEPTION_MARK;
1649
1650 if (UsePerfData) {
1651 // jvmstat performance counters
1652 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1653 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1654 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1655 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1656 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1657 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1658 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1659 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1660 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1661 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1662
1663 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1664 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1665 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1666 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1667 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1668 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1669 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1670 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1671 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1672 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1673 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1674 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1675 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1676
1677
1678 // The following performance counters are added for measuring the impact
1679 // of the bug fix of 6365597. They are mainly focused on finding out
1680 // the behavior of system & user-defined classloader lock, whether
1681 // ClassLoader.loadClass/findClass is being called synchronized or not.
1682 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1683 "systemLoaderLockContentionRate");
1684 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1685 "nonSystemLoaderLockContentionRate");
1686 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1687 "jvmFindLoadedClassNoLockCalls");
1688 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1689 "jvmDefineClassNoLockCalls");
1690
1691 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1692 "jniDefineClassNoLockCalls");
1693
1694 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1695 "unsafeDefineClassCalls");
1696
1697 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1698 "loadInstanceClassFailRate");
1699 }
1700
1701 // lookup zip library entry points
1702 load_zip_library();
1703 // lookup jimage library entry points
1704 load_jimage_library();
1705 #if INCLUDE_CDS
1706 // initialize search path
1707 if (DumpSharedSpaces) {
1708 _shared_paths_misc_info = new SharedPathsMiscInfo();
1709 }
1710 #endif
1711 setup_bootstrap_search_path();
1712 }
1713
1714 #if INCLUDE_CDS
1715 void ClassLoader::initialize_shared_path() {
1716 if (DumpSharedSpaces) {
1717 ClassLoaderExt::setup_search_paths();
1718 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1719 }
1720 }
1721
1722 void ClassLoader::initialize_module_path(TRAPS) {
1723 if (DumpSharedSpaces) {
1724 ClassLoaderExt::setup_module_paths(THREAD);
1725 FileMapInfo::allocate_shared_path_table();
1726 }
1727 }
1728 #endif
1729
1730 jlong ClassLoader::classloader_time_ms() {
1731 return UsePerfData ?
1732 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1733 }
1734
1735 jlong ClassLoader::class_init_count() {
1736 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1737 }
1738
1739 jlong ClassLoader::class_init_time_ms() {
1740 return UsePerfData ?
1741 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1742 }
1743
1744 jlong ClassLoader::class_verify_time_ms() {
1745 return UsePerfData ?
1746 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1747 }
1748
1749 jlong ClassLoader::class_link_count() {
1750 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1751 }
1752
1753 jlong ClassLoader::class_link_time_ms() {
1754 return UsePerfData ?
1755 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1756 }
1757
1758 int ClassLoader::compute_Object_vtable() {
1759 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1760 // code to determine actual value from file
1761 // Would be value '11' if finals were in vtable
1762 int JDK_1_2_Object_vtable_size = 5;
1763 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1764 }
1765
1766
1767 void classLoader_init1() {
1768 ClassLoader::initialize();
1769 }
1770
1771 // Complete the ClassPathEntry setup for the boot loader
1772 void ClassLoader::classLoader_init2(TRAPS) {
1773 // Setup the list of module/path pairs for --patch-module processing
1774 // This must be done after the SymbolTable is created in order
1775 // to use fast_compare on module names instead of a string compare.
1776 if (Arguments::get_patch_mod_prefix() != NULL) {
1777 setup_patch_mod_entries();
1778 }
1779
1780 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
1781 // to successfully determine if java.base has been patched)
1782 create_javabase();
1783
1784 // Setup the initial java.base/path pair for the exploded build entries.
1785 // As more modules are defined during module system initialization, more
1786 // entries will be added to the exploded build array.
1787 if (!has_jrt_entry()) {
1788 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds");
1789 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds");
1790 // Set up the boot loader's _exploded_entries list. Note that this gets
1791 // done before loading any classes, by the same thread that will
1792 // subsequently do the first class load. So, no lock is needed for this.
1793 assert(_exploded_entries == NULL, "Should only get initialized once");
1794 _exploded_entries = new (ResourceObj::C_HEAP, mtModule)
1795 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true);
1796 add_to_exploded_build_list(vmSymbols::java_base(), CHECK);
1797 }
1798 }
1799
1800
1801 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1802 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1803 if (CanonicalizeEntry != NULL) {
1804 JavaThread* THREAD = JavaThread::current();
1805 JNIEnv* env = THREAD->jni_environment();
1806 ResourceMark rm(THREAD);
1807
1808 // os::native_path writes into orig_copy
1809 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1810 strcpy(orig_copy, orig);
1811 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1812 return false;
1813 }
1814 } else {
1815 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1816 strncpy(out, orig, len);
1817 out[len - 1] = '\0';
1818 }
1819 return true;
1820 }
1821
1822 void ClassLoader::create_javabase() {
1823 Thread* THREAD = Thread::current();
1824
1825 // Create java.base's module entry for the boot
1826 // class loader prior to loading j.l.Ojbect.
1827 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1828
1829 // Get module entry table
1830 ModuleEntryTable* null_cld_modules = null_cld->modules();
1831 if (null_cld_modules == NULL) {
1832 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1833 }
1834
1835 {
1836 MutexLocker ml(Module_lock, THREAD);
1837 ModuleEntry* jb_module = null_cld_modules->locked_create_entry_or_null(Handle(),
1838 false, vmSymbols::java_base(), NULL, NULL, null_cld);
1839 if (jb_module == NULL) {
1840 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
1841 }
1842 ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1843 }
1844 }
1845
1846 #ifndef PRODUCT
1847
1848 // CompileTheWorld
1849 //
1850 // Iterates over all class path entries and forces compilation of all methods
1851 // in all classes found. Currently, only zip/jar archives are searched.
1852 //
1853 // The classes are loaded by the Java level bootstrap class loader, and the
1854 // initializer is called. If DelayCompilationDuringStartup is true (default),
1855 // the interpreter will run the initialization code. Note that forcing
1856 // initialization in this way could potentially lead to initialization order
1857 // problems, in which case we could just force the initialization bit to be set.
1858
1859
1860 // We need to iterate over the contents of a zip/jar file, so we replicate the
1861 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1862 // since jzfile already has a void* definition.
1863 //
1864 // Note that this is only used in debug mode.
1865 //
1866 // HotSpot integration note:
1867 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1868
1869
1870 // JDK 1.3 version
1871 typedef struct real_jzentry { /* Zip file entry */
1872 char *name; /* entry name */
1873 jint time; /* modification time */
1874 jint size; /* size of uncompressed data */
1875 jint csize; /* size of compressed data (zero if uncompressed) */
1876 jint crc; /* crc of uncompressed data */
1877 char *comment; /* optional zip file comment */
1878 jbyte *extra; /* optional extra data */
1879 jint pos; /* position of LOC header (if negative) or data */
1880 } real_jzentry;
1881
1882 typedef struct real_jzfile { /* Zip file */
1883 char *name; /* zip file name */
1884 jint refs; /* number of active references */
1885 jint fd; /* open file descriptor */
1886 void *lock; /* read lock */
1887 char *comment; /* zip file comment */
1888 char *msg; /* zip error message */
1889 void *entries; /* array of hash cells */
1890 jint total; /* total number of entries */
1891 unsigned short *table; /* Hash chain heads: indexes into entries */
1892 jint tablelen; /* number of hash eads */
1893 real_jzfile *next; /* next zip file in search list */
1894 jzentry *cache; /* we cache the most recently freed jzentry */
1895 /* Information on metadata names in META-INF directory */
1896 char **metanames; /* array of meta names (may have null names) */
1897 jint metacount; /* number of slots in metanames array */
1898 /* If there are any per-entry comments, they are in the comments array */
1899 char **comments;
1900 } real_jzfile;
1901
1902 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1903 // For now we only compile all methods in all classes in zip/jar files
1904 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1905 tty->cr();
1906 }
1907
1908 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1909 real_jzfile* zip = (real_jzfile*) _zip;
1910 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1911 tty->cr();
1912 // Iterate over all entries in zip file
1913 for (int n = 0; ; n++) {
1914 real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n));
1915 if (ze == NULL) break;
1916 ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1917 }
1918 if (HAS_PENDING_EXCEPTION) {
1919 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1920 CLEAR_PENDING_EXCEPTION;
1921 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1922 tty->print_cr("Increase class metadata storage if a limit was set");
1923 } else {
1924 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1925 }
1926 }
1927 }
1928
1929 void ClassLoader::compile_the_world() {
1930 EXCEPTION_MARK;
1931 HandleMark hm(THREAD);
1932 ResourceMark rm(THREAD);
1933
1934 assert(has_jrt_entry(), "Compile The World not supported with exploded module build");
1935
1936 // Find bootstrap loader
1937 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1938 jlong start = os::javaTimeMillis();
1939
1940 // Compile the world for the modular java runtime image
1941 _jrt_entry->compile_the_world(system_class_loader, CATCH);
1942
1943 // Iterate over all bootstrap class path appended entries
1944 ClassPathEntry* e = _first_append_entry;
1945 while (e != NULL) {
1946 assert(!e->is_modules_image(), "A modular java runtime image is present on the list of appended entries");
1947 e->compile_the_world(system_class_loader, CATCH);
1948 e = e->next();
1949 }
1950 jlong end = os::javaTimeMillis();
1951 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1952 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1953 {
1954 // Print statistics as if before normal exit:
1955 extern void print_statistics();
1956 print_statistics();
1957 }
1958 vm_exit(0);
1959 }
1960
1961 int ClassLoader::_compile_the_world_class_counter = 0;
1962 int ClassLoader::_compile_the_world_method_counter = 0;
1963 static int _codecache_sweep_counter = 0;
1964
1965 // Filter out all exceptions except OOMs
1966 static void clear_pending_exception_if_not_oom(TRAPS) {
1967 if (HAS_PENDING_EXCEPTION &&
1968 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1969 CLEAR_PENDING_EXCEPTION;
1970 }
1971 // The CHECK at the caller will propagate the exception out
1972 }
1973
1974 /**
1975 * Returns if the given method should be compiled when doing compile-the-world.
1976 *
1977 * TODO: This should be a private method in a CompileTheWorld class.
1978 */
1979 static bool can_be_compiled(const methodHandle& m, int comp_level) {
1980 assert(CompileTheWorld, "must be");
1981
1982 // It's not valid to compile a native wrapper for MethodHandle methods
1983 // that take a MemberName appendix since the bytecode signature is not
1984 // correct.
1985 vmIntrinsics::ID iid = m->intrinsic_id();
1986 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1987 return false;
1988 }
1989
1990 return CompilationPolicy::can_be_compiled(m, comp_level);
1991 }
1992
1993 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1994 if (string_ends_with(name, ".class")) {
1995 // We have a .class file
1996 int len = (int)strlen(name);
1997 char buffer[2048];
1998 strncpy(buffer, name, len - 6);
1999 buffer[len-6] = 0;
2000 // If the file has a period after removing .class, it's not really a
2001 // valid class file. The class loader will check everything else.
2002 if (strchr(buffer, '.') == NULL) {
2003 _compile_the_world_class_counter++;
2004 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
2005
2006 // Construct name without extension
2007 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
2008 // Use loader to load and initialize class
2009 Klass* k = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
2010 if (k != NULL && !HAS_PENDING_EXCEPTION) {
2011 k->initialize(THREAD);
2012 }
2013 bool exception_occurred = HAS_PENDING_EXCEPTION;
2014 clear_pending_exception_if_not_oom(CHECK);
2015 if (CompileTheWorldPreloadClasses && k != NULL) {
2016 InstanceKlass* ik = InstanceKlass::cast(k);
2017 ConstantPool::preload_and_initialize_all_classes(ik->constants(), THREAD);
2018 if (HAS_PENDING_EXCEPTION) {
2019 // If something went wrong in preloading we just ignore it
2020 clear_pending_exception_if_not_oom(CHECK);
2021 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
2022 }
2023 }
2024
2025 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
2026 if (k == NULL || exception_occurred) {
2027 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
2028 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
2029 } else {
2030 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
2031 // Preload all classes to get around uncommon traps
2032 // Iterate over all methods in class
2033 int comp_level = CompilationPolicy::policy()->initial_compile_level();
2034 InstanceKlass* ik = InstanceKlass::cast(k);
2035 for (int n = 0; n < ik->methods()->length(); n++) {
2036 methodHandle m (THREAD, ik->methods()->at(n));
2037 if (can_be_compiled(m, comp_level)) {
2038 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
2039 // Give sweeper a chance to keep up with CTW
2040 VM_CTWThreshold op;
2041 VMThread::execute(&op);
2042 _codecache_sweep_counter = 0;
2043 }
2044 // Force compilation
2045 CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
2046 methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
2047 if (HAS_PENDING_EXCEPTION) {
2048 clear_pending_exception_if_not_oom(CHECK);
2049 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
2050 } else {
2051 _compile_the_world_method_counter++;
2052 }
2053 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
2054 // Clobber the first compile and force second tier compilation
2055 CompiledMethod* nm = m->code();
2056 if (nm != NULL && !m->is_method_handle_intrinsic()) {
2057 // Throw out the code so that the code cache doesn't fill up
2058 nm->make_not_entrant();
2059 }
2060 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
2061 methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
2062 if (HAS_PENDING_EXCEPTION) {
2063 clear_pending_exception_if_not_oom(CHECK);
2064 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
2065 } else {
2066 _compile_the_world_method_counter++;
2067 }
2068 }
2069 } else {
2070 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
2071 }
2072
2073 CompiledMethod* nm = m->code();
2074 if (nm != NULL && !m->is_method_handle_intrinsic()) {
2075 // Throw out the code so that the code cache doesn't fill up
2076 nm->make_not_entrant();
2077 }
2078 }
2079 }
2080 }
2081 }
2082 }
2083 }
2084
2085 #endif //PRODUCT
2086
2087 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
2088 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
2089 void PerfClassTraceTime::initialize() {
2090 if (!UsePerfData) return;
2091
2092 if (_eventp != NULL) {
2093 // increment the event counter
2094 _eventp->inc();
2095 }
2096
2097 // stop the current active thread-local timer to measure inclusive time
2098 _prev_active_event = -1;
2099 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
2100 if (_timers[i].is_active()) {
2101 assert(_prev_active_event == -1, "should have only one active timer");
2102 _prev_active_event = i;
2103 _timers[i].stop();
2104 }
2105 }
2106
2107 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
2108 // start the inclusive timer if not recursively called
2109 _t.start();
2110 }
2111
2112 // start thread-local timer of the given event type
2113 if (!_timers[_event_type].is_active()) {
2114 _timers[_event_type].start();
2115 }
2116 }
2117
2118 PerfClassTraceTime::~PerfClassTraceTime() {
2119 if (!UsePerfData) return;
2120
2121 // stop the thread-local timer as the event completes
2122 // and resume the thread-local timer of the event next on the stack
2123 _timers[_event_type].stop();
2124 jlong selftime = _timers[_event_type].ticks();
2125
2126 if (_prev_active_event >= 0) {
2127 _timers[_prev_active_event].start();
2128 }
2129
2130 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
2131
2132 // increment the counters only on the leaf call
2133 _t.stop();
2134 _timep->inc(_t.ticks());
2135 if (_selftimep != NULL) {
2136 _selftimep->inc(selftime);
2137 }
2138 // add all class loading related event selftime to the accumulated time counter
2139 ClassLoader::perf_accumulated_time()->inc(selftime);
2140
2141 // reset the timer
2142 _timers[_event_type].reset();
2143 }