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 "gc/shared/collectedHeap.inline.hpp"
41 #include "gc/shared/generation.hpp"
42 #include "interpreter/bytecodeStream.hpp"
43 #include "interpreter/oopMapCache.hpp"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "logging/logTag.hpp"
47 #include "memory/allocation.inline.hpp"
48 #include "memory/filemap.hpp"
49 #include "memory/oopFactory.hpp"
50 #include "memory/resourceArea.hpp"
51 #include "memory/universe.hpp"
52 #include "oops/instanceKlass.hpp"
53 #include "oops/instanceRefKlass.hpp"
54 #include "oops/method.inline.hpp"
55 #include "oops/objArrayOop.inline.hpp"
56 #include "oops/oop.inline.hpp"
57 #include "oops/symbol.hpp"
58 #include "prims/jvm_misc.hpp"
59 #include "runtime/arguments.hpp"
60 #include "runtime/compilationPolicy.hpp"
61 #include "runtime/handles.hpp"
62 #include "runtime/handles.inline.hpp"
63 #include "runtime/init.hpp"
64 #include "runtime/interfaceSupport.inline.hpp"
65 #include "runtime/java.hpp"
66 #include "runtime/javaCalls.hpp"
67 #include "runtime/os.inline.hpp"
68 #include "runtime/threadCritical.hpp"
69 #include "runtime/timer.hpp"
70 #include "runtime/vm_version.hpp"
71 #include "services/management.hpp"
72 #include "services/threadService.hpp"
73 #include "utilities/events.hpp"
74 #include "utilities/hashtable.inline.hpp"
75 #include "utilities/macros.hpp"
76 #if INCLUDE_CDS
77 #include "classfile/sharedClassUtil.hpp"
78 #include "classfile/sharedPathsMiscInfo.hpp"
79 #endif
80
81 // Entry points in zip.dll for loading zip/jar file entries
82
83 typedef void * * (*ZipOpen_t)(const char *name, char **pmsg);
84 typedef void (*ZipClose_t)(jzfile *zip);
85 typedef jzentry* (*FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
86 typedef jboolean (*ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
87 typedef jzentry* (*GetNextEntry_t)(jzfile *zip, jint n);
88 typedef jboolean (*ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg);
89 typedef jint (*Crc32_t)(jint crc, const jbyte *buf, jint len);
90
91 static ZipOpen_t ZipOpen = NULL;
92 static ZipClose_t ZipClose = NULL;
93 static FindEntry_t FindEntry = NULL;
94 static ReadEntry_t ReadEntry = NULL;
95 static GetNextEntry_t GetNextEntry = NULL;
96 static canonicalize_fn_t CanonicalizeEntry = NULL;
97 static ZipInflateFully_t ZipInflateFully = NULL;
98 static Crc32_t Crc32 = NULL;
99
100 // Entry points for jimage.dll for loading jimage file entries
101
102 static JImageOpen_t JImageOpen = NULL;
103 static JImageClose_t JImageClose = NULL;
104 static JImagePackageToModule_t JImagePackageToModule = NULL;
105 static JImageFindResource_t JImageFindResource = NULL;
106 static JImageGetResource_t JImageGetResource = NULL;
107 static JImageResourceIterator_t JImageResourceIterator = NULL;
108 static JImage_ResourcePath_t JImageResourcePath = NULL;
109
110 // Globals
111
112 PerfCounter* ClassLoader::_perf_accumulated_time = NULL;
113 PerfCounter* ClassLoader::_perf_classes_inited = NULL;
114 PerfCounter* ClassLoader::_perf_class_init_time = NULL;
115 PerfCounter* ClassLoader::_perf_class_init_selftime = NULL;
116 PerfCounter* ClassLoader::_perf_classes_verified = NULL;
117 PerfCounter* ClassLoader::_perf_class_verify_time = NULL;
118 PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL;
119 PerfCounter* ClassLoader::_perf_classes_linked = NULL;
120 PerfCounter* ClassLoader::_perf_class_link_time = NULL;
121 PerfCounter* ClassLoader::_perf_class_link_selftime = NULL;
122 PerfCounter* ClassLoader::_perf_class_parse_time = NULL;
123 PerfCounter* ClassLoader::_perf_class_parse_selftime = NULL;
124 PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL;
125 PerfCounter* ClassLoader::_perf_shared_classload_time = NULL;
126 PerfCounter* ClassLoader::_perf_sys_classload_time = NULL;
127 PerfCounter* ClassLoader::_perf_app_classload_time = NULL;
128 PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL;
129 PerfCounter* ClassLoader::_perf_app_classload_count = NULL;
130 PerfCounter* ClassLoader::_perf_define_appclasses = NULL;
131 PerfCounter* ClassLoader::_perf_define_appclass_time = NULL;
132 PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL;
133 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL;
134 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL;
135 PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
136 PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
137 PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
138 PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
139 PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
140 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = 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 #if INCLUDE_CDS
149 ClassPathEntry* ClassLoader::_app_classpath_entries = NULL;
150 ClassPathEntry* ClassLoader::_last_app_classpath_entry = NULL;
151 ClassPathEntry* ClassLoader::_module_path_entries = NULL;
152 ClassPathEntry* ClassLoader::_last_module_path_entry = NULL;
153 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL;
154 #endif
155
156 // helper routines
157 bool string_starts_with(const char* str, const char* str_to_find) {
158 size_t str_len = strlen(str);
159 size_t str_to_find_len = strlen(str_to_find);
160 if (str_to_find_len > str_len) {
161 return false;
162 }
163 return (strncmp(str, str_to_find, str_to_find_len) == 0);
164 }
165
166 static const char* get_jimage_version_string() {
167 static char version_string[10] = "";
168 if (version_string[0] == '\0') {
169 jio_snprintf(version_string, sizeof(version_string), "%d.%d",
170 Abstract_VM_Version::vm_major_version(), Abstract_VM_Version::vm_minor_version());
171 }
172 return (const char*)version_string;
173 }
174
175 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) {
176 size_t str_len = strlen(str);
177 size_t str_to_find_len = strlen(str_to_find);
178 if (str_to_find_len > str_len) {
179 return false;
180 }
181 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
182 }
183
184 // Used to obtain the package name from a fully qualified class name.
185 // It is the responsibility of the caller to establish a ResourceMark.
186 const char* ClassLoader::package_from_name(const char* const class_name, bool* bad_class_name) {
187 if (class_name == NULL) {
188 if (bad_class_name != NULL) {
189 *bad_class_name = true;
190 }
191 return NULL;
192 }
193
194 if (bad_class_name != NULL) {
195 *bad_class_name = false;
196 }
197
198 const char* const last_slash = strrchr(class_name, '/');
199 if (last_slash == NULL) {
200 // No package name
201 return NULL;
202 }
203
204 char* class_name_ptr = (char*) class_name;
205 // Skip over '['s
206 if (*class_name_ptr == '[') {
207 do {
208 class_name_ptr++;
209 } while (*class_name_ptr == '[');
210
211 // Fully qualified class names should not contain a 'L'.
212 // Set bad_class_name to true to indicate that the package name
213 // could not be obtained due to an error condition.
214 // In this situation, is_same_class_package returns false.
215 if (*class_name_ptr == 'L') {
216 if (bad_class_name != NULL) {
217 *bad_class_name = true;
218 }
219 return NULL;
220 }
221 }
222
223 int length = last_slash - class_name_ptr;
224
225 // A class name could have just the slash character in the name.
226 if (length <= 0) {
227 // No package name
228 if (bad_class_name != NULL) {
229 *bad_class_name = true;
230 }
231 return NULL;
232 }
233
234 // drop name after last slash (including slash)
235 // Ex., "java/lang/String.class" => "java/lang"
236 char* pkg_name = NEW_RESOURCE_ARRAY(char, length + 1);
237 strncpy(pkg_name, class_name_ptr, length);
238 *(pkg_name+length) = '\0';
239
240 return (const char *)pkg_name;
241 }
242
243 // Given a fully qualified class name, find its defining package in the class loader's
244 // package entry table.
245 PackageEntry* ClassLoader::get_package_entry(const char* class_name, ClassLoaderData* loader_data, TRAPS) {
246 ResourceMark rm(THREAD);
247 const char *pkg_name = ClassLoader::package_from_name(class_name);
248 if (pkg_name == NULL) {
249 return NULL;
250 }
251 PackageEntryTable* pkgEntryTable = loader_data->packages();
252 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(pkg_name, CHECK_NULL);
253 return pkgEntryTable->lookup_only(pkg_symbol);
254 }
255
256 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() {
257 char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
258 strcpy(copy, dir);
259 _dir = copy;
260 }
261
262
263 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
264 // construct full path name
265 assert((_dir != NULL) && (name != NULL), "sanity");
266 size_t path_len = strlen(_dir) + strlen(name) + strlen(os::file_separator()) + 1;
267 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, path_len);
268 int len = jio_snprintf(path, path_len, "%s%s%s", _dir, os::file_separator(), name);
269 assert(len == (int)(path_len - 1), "sanity");
270 // check if file exists
271 struct stat st;
272 if (os::stat(path, &st) == 0) {
273 // found file, open it
274 int file_handle = os::open(path, 0, 0);
275 if (file_handle != -1) {
276 // read contents into resource array
277 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
278 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
279 // close file
280 os::close(file_handle);
281 // construct ClassFileStream
282 if (num_read == (size_t)st.st_size) {
283 if (UsePerfData) {
284 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
285 }
286 FREE_RESOURCE_ARRAY(char, path, path_len);
287 // Resource allocated
288 return new ClassFileStream(buffer,
289 st.st_size,
290 _dir,
291 ClassFileStream::verify);
292 }
293 }
294 }
295 FREE_RESOURCE_ARRAY(char, path, path_len);
296 return NULL;
297 }
298
299 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name, bool is_boot_append) : ClassPathEntry() {
300 _zip = zip;
301 char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
302 strcpy(copy, zip_name);
303 _zip_name = copy;
304 _is_boot_append = is_boot_append;
305 _multi_versioned = _unknown;
306 }
307
308 ClassPathZipEntry::~ClassPathZipEntry() {
309 if (ZipClose != NULL) {
310 (*ZipClose)(_zip);
311 }
312 FREE_C_HEAP_ARRAY(char, _zip_name);
313 }
314
315 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
316 // enable call to C land
317 JavaThread* thread = JavaThread::current();
318 ThreadToNativeFromVM ttn(thread);
319 // check whether zip archive contains name
320 jint name_len;
321 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
322 if (entry == NULL) return NULL;
323 u1* buffer;
324 char name_buf[128];
325 char* filename;
326 if (name_len < 128) {
327 filename = name_buf;
328 } else {
329 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
330 }
331
332 // read contents into resource array
333 int size = (*filesize) + ((nul_terminate) ? 1 : 0);
334 buffer = NEW_RESOURCE_ARRAY(u1, size);
335 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
336
337 // return result
338 if (nul_terminate) {
339 buffer[*filesize] = 0;
340 }
341 return buffer;
342 }
343
344 #if INCLUDE_CDS
345 u1* ClassPathZipEntry::open_versioned_entry(const char* name, jint* filesize, TRAPS) {
346 u1* buffer = NULL;
347 if (DumpSharedSpaces && !_is_boot_append) {
348 // We presume default is multi-release enabled
349 const char* multi_ver = Arguments::get_property("jdk.util.jar.enableMultiRelease");
350 const char* verstr = Arguments::get_property("jdk.util.jar.version");
351 bool is_multi_ver = (multi_ver == NULL ||
352 strcmp(multi_ver, "true") == 0 ||
353 strcmp(multi_ver, "force") == 0) &&
354 is_multiple_versioned(THREAD);
355 // command line version setting
356 int version = 0;
357 const int base_version = 8; // JDK8
358 int cur_ver = JDK_Version::current().major_version();
359 if (verstr != NULL) {
360 version = atoi(verstr);
361 if (version < base_version || version > cur_ver) {
362 // If the specified version is lower than the base version, the base
363 // entry will be used; if the version is higher than the current
364 // jdk version, the highest versioned entry will be used.
365 if (version < base_version) {
366 is_multi_ver = false;
367 }
368 // print out warning, do not use assertion here since it will continue to look
369 // for proper version.
370 warning("JDK%d is not supported in multiple version jars", version);
371 }
372 }
373
374 if (is_multi_ver) {
375 int n;
376 const char* version_entry = "META-INF/versions/";
377 // 10 is the max length of a decimal 32-bit non-negative number
378 // 2 includes the '/' and trailing zero
379 size_t entry_name_len = strlen(version_entry) + 10 + strlen(name) + 2;
380 char* entry_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, entry_name_len);
381 if (version > 0) {
382 n = jio_snprintf(entry_name, entry_name_len, "%s%d/%s", version_entry, version, name);
383 entry_name[n] = '\0';
384 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
385 if (buffer == NULL) {
386 warning("Could not find %s in %s, try to find highest version instead", entry_name, _zip_name);
387 }
388 }
389 if (buffer == NULL) {
390 for (int i = cur_ver; i >= base_version; i--) {
391 n = jio_snprintf(entry_name, entry_name_len, "%s%d/%s", version_entry, i, name);
392 entry_name[n] = '\0';
393 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
394 if (buffer != NULL) {
395 break;
396 }
397 }
398 }
399 FREE_RESOURCE_ARRAY(char, entry_name, entry_name_len);
400 }
401 }
402 return buffer;
403 }
404
405 bool ClassPathZipEntry::is_multiple_versioned(TRAPS) {
406 assert(DumpSharedSpaces, "called only at dump time");
407 if (_multi_versioned != _unknown) {
408 return (_multi_versioned == _yes) ? true : false;
409 }
410 jint size;
411 char* buffer = (char*)open_entry("META-INF/MANIFEST.MF", &size, true, CHECK_false);
412 if (buffer != NULL) {
413 char* p = buffer;
414 for ( ; *p; ++p) *p = tolower(*p);
415 if (strstr(buffer, "multi-release: true") != NULL) {
416 _multi_versioned = _yes;
417 return true;
418 }
419 }
420 _multi_versioned = _no;
421 return false;
422 }
423 #endif // INCLUDE_CDS
424
425 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
426 jint filesize;
427 u1* buffer = open_versioned_entry(name, &filesize, CHECK_NULL);
428 if (buffer == NULL) {
429 buffer = open_entry(name, &filesize, false, CHECK_NULL);
430 if (buffer == NULL) {
431 return NULL;
432 }
433 }
434 if (UsePerfData) {
435 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
436 }
437 // Resource allocated
438 return new ClassFileStream(buffer,
439 filesize,
440 _zip_name,
441 ClassFileStream::verify);
442 }
443
444 // invoke function for each entry in the zip file
445 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
446 JavaThread* thread = JavaThread::current();
447 HandleMark handle_mark(thread);
448 ThreadToNativeFromVM ttn(thread);
449 for (int n = 0; ; n++) {
450 jzentry * ze = ((*GetNextEntry)(_zip, n));
451 if (ze == NULL) break;
452 (*f)(ze->name, context);
453 }
454 }
455
456 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
457 ClassPathEntry(),
458 _jimage(jimage) {
459 guarantee(jimage != NULL, "jimage file is null");
460 guarantee(name != NULL, "jimage file name is null");
461 size_t len = strlen(name) + 1;
462 _name = NEW_C_HEAP_ARRAY(const char, len, mtClass);
463 strncpy((char *)_name, name, len);
464 }
465
466 ClassPathImageEntry::~ClassPathImageEntry() {
467 if (_name != NULL) {
468 FREE_C_HEAP_ARRAY(const char, _name);
469 _name = NULL;
470 }
471 if (_jimage != NULL) {
472 (*JImageClose)(_jimage);
473 _jimage = NULL;
474 }
475 }
476
477 // For a class in a named module, look it up in the jimage file using this syntax:
478 // /<module-name>/<package-name>/<base-class>
479 //
480 // Assumptions:
481 // 1. There are no unnamed modules in the jimage file.
482 // 2. A package is in at most one module in the jimage file.
483 //
484 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
485 jlong size;
486 JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size);
487
488 if (location == 0) {
489 ResourceMark rm;
490 const char* pkg_name = ClassLoader::package_from_name(name);
491
492 if (pkg_name != NULL) {
493 if (!Universe::is_module_initialized()) {
494 location = (*JImageFindResource)(_jimage, JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
495 #if INCLUDE_CDS
496 // CDS uses the boot class loader to load classes whose packages are in
497 // modules defined for other class loaders. So, for now, get their module
498 // names from the "modules" jimage file.
499 if (DumpSharedSpaces && location == 0) {
500 const char* module_name = (*JImagePackageToModule)(_jimage, pkg_name);
501 if (module_name != NULL) {
502 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
503 }
504 }
505 #endif
506
507 } else {
508 PackageEntry* package_entry = ClassLoader::get_package_entry(name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
509 if (package_entry != NULL) {
510 ResourceMark rm;
511 // Get the module name
512 ModuleEntry* module = package_entry->module();
513 assert(module != NULL, "Boot classLoader package missing module");
514 assert(module->is_named(), "Boot classLoader package is in unnamed module");
515 const char* module_name = module->name()->as_C_string();
516 if (module_name != NULL) {
517 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
518 }
519 }
520 }
521 }
522 }
523 if (location != 0) {
524 if (UsePerfData) {
525 ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
526 }
527 char* data = NEW_RESOURCE_ARRAY(char, size);
528 (*JImageGetResource)(_jimage, location, data, size);
529 // Resource allocated
530 return new ClassFileStream((u1*)data,
531 (int)size,
532 _name,
533 ClassFileStream::verify);
534 }
535
536 return NULL;
537 }
538
539 JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf,
540 const char* module_name,
541 const char* file_name,
542 jlong &size) {
543 return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size));
544 }
545
546 #ifndef PRODUCT
547 bool ctw_visitor(JImageFile* jimage,
548 const char* module_name, const char* version, const char* package,
549 const char* name, const char* extension, void* arg) {
550 if (strcmp(extension, "class") == 0) {
551 Thread* THREAD = Thread::current();
552 ResourceMark rm(THREAD);
553 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JIMAGE_MAX_PATH);
554 jio_snprintf(path, JIMAGE_MAX_PATH - 1, "%s/%s.class", package, name);
555 ClassLoader::compile_the_world_in(path, *(Handle*)arg, THREAD);
556 return !HAS_PENDING_EXCEPTION;
557 }
558 return true;
559 }
560
561 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) {
562 tty->print_cr("CompileTheWorld : Compiling all classes in %s", name());
563 tty->cr();
564 (*JImageResourceIterator)(_jimage, (JImageResourceVisitor_t)ctw_visitor, (void *)&loader);
565 if (HAS_PENDING_EXCEPTION) {
566 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
567 CLEAR_PENDING_EXCEPTION;
568 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
569 tty->print_cr("Increase class metadata storage if a limit was set");
570 } else {
571 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
572 }
573 }
574 }
575 #endif
576
577 bool ClassPathImageEntry::is_modules_image() const {
578 return ClassLoader::is_modules_image(name());
579 }
580
581 #if INCLUDE_CDS
582 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
583 assert(DumpSharedSpaces, "only called at dump time");
584 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure");
585 vm_exit_during_initialization(error, message);
586 }
587 #endif
588
589 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
590 _module_name = module_name;
591 _module_first_entry = NULL;
592 _module_last_entry = NULL;
593 }
594
595 ModuleClassPathList::~ModuleClassPathList() {
596 // Clean out each ClassPathEntry on list
597 ClassPathEntry* e = _module_first_entry;
598 while (e != NULL) {
599 ClassPathEntry* next_entry = e->next();
600 delete e;
601 e = next_entry;
602 }
603 }
604
605 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
606 if (new_entry != NULL) {
607 if (_module_last_entry == NULL) {
608 _module_first_entry = _module_last_entry = new_entry;
609 } else {
610 _module_last_entry->set_next(new_entry);
611 _module_last_entry = new_entry;
612 }
613 }
614 }
615
616 void ClassLoader::trace_class_path(const char* msg, const char* name) {
617 LogTarget(Info, class, path) lt;
618 if (lt.is_enabled()) {
619 LogStream ls(lt);
620 if (msg) {
621 ls.print("%s", msg);
622 }
623 if (name) {
624 if (strlen(name) < 256) {
625 ls.print("%s", name);
626 } else {
627 // For very long paths, we need to print each character separately,
628 // as print_cr() has a length limit
629 while (name[0] != '\0') {
630 ls.print("%c", name[0]);
631 name++;
632 }
633 }
634 }
635 ls.cr();
636 }
637 }
638
639 #if INCLUDE_CDS
640 void ClassLoader::check_shared_classpath(const char *path) {
641 if (strcmp(path, "") == 0) {
642 exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
643 }
644
645 struct stat st;
646 if (os::stat(path, &st) == 0) {
647 if ((st.st_mode & S_IFMT) != S_IFREG) { // is not a regular file
648 if (!os::dir_is_empty(path)) {
649 tty->print_cr("Error: non-empty directory '%s'", path);
650 exit_with_path_failure("CDS allows only empty directories in archived classpaths",
651 NULL);
652 }
653 }
654 }
655 }
656 #endif
657
658 void ClassLoader::setup_bootstrap_search_path() {
659 const char* sys_class_path = Arguments::get_sysclasspath();
660 if (PrintSharedArchiveAndExit) {
661 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
662 // the same as the bootcp of the shared archive.
663 } else {
664 trace_class_path("bootstrap loader class path=", sys_class_path);
665 }
666 #if INCLUDE_CDS
667 if (DumpSharedSpaces) {
668 _shared_paths_misc_info->add_boot_classpath(sys_class_path);
669 }
670 #endif
671 setup_boot_search_path(sys_class_path);
672 }
673
674 #if INCLUDE_CDS
675 int ClassLoader::get_shared_paths_misc_info_size() {
676 return _shared_paths_misc_info->get_used_bytes();
677 }
678
679 void* ClassLoader::get_shared_paths_misc_info() {
680 return _shared_paths_misc_info->buffer();
681 }
682
683 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
684 SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
685 bool result = checker->check();
686 delete checker;
687 return result;
688 }
689
690 void ClassLoader::setup_app_search_path(const char *class_path) {
691
692 assert(DumpSharedSpaces, "Sanity");
693
694 Thread* THREAD = Thread::current();
695 int len = (int)strlen(class_path);
696 int end = 0;
697
698 // Iterate over class path entries
699 for (int start = 0; start < len; start = end) {
700 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
701 end++;
702 }
703 EXCEPTION_MARK;
704 ResourceMark rm(THREAD);
705 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
706 strncpy(path, &class_path[start], end - start);
707 path[end - start] = '\0';
708
709 update_class_path_entry_list(path, false, false);
710
711 while (class_path[end] == os::path_separator()[0]) {
712 end++;
713 }
714 }
715 }
716
717 void ClassLoader::add_to_module_path_entries(const char* path,
718 ClassPathEntry* entry) {
719 assert(entry != NULL, "ClassPathEntry should not be NULL");
720 assert(DumpSharedSpaces, "dump time only");
721
722 // The entry does not exist, add to the list
723 if (_module_path_entries == NULL) {
724 assert(_last_module_path_entry == NULL, "Sanity");
725 _module_path_entries = _last_module_path_entry = entry;
726 } else {
727 _last_module_path_entry->set_next(entry);
728 _last_module_path_entry = entry;
729 }
730 }
731
732 // Add a module path to the _module_path_entries list.
733 void ClassLoader::update_module_path_entry_list(const char *path, TRAPS) {
734 assert(DumpSharedSpaces, "dump time only");
735 struct stat st;
736 int ret = os::stat(path, &st);
737 assert(ret == 0, "module path must exist");
738 // File or directory found
739 ClassPathEntry* new_entry = NULL;
740 new_entry = create_class_path_entry(path, &st, true /* throw_exception */,
741 false /*is_boot_append */, CHECK);
742 if (new_entry == NULL) {
743 return;
744 }
745
746 add_to_module_path_entries(path, new_entry);
747 return;
748 }
749
750 void ClassLoader::setup_module_search_path(const char* path, TRAPS) {
751 update_module_path_entry_list(path, THREAD);
752 }
753 #endif // INCLUDE_CDS
754
755 // Construct the array of module/path pairs as specified to --patch-module
756 // for the boot loader to search ahead of the jimage, if the class being
757 // loaded is defined to a module that has been specified to --patch-module.
758 void ClassLoader::setup_patch_mod_entries() {
759 Thread* THREAD = Thread::current();
760 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
761 int num_of_entries = patch_mod_args->length();
762
763
764 // Set up the boot loader's _patch_mod_entries list
765 _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true);
766
767 for (int i = 0; i < num_of_entries; i++) {
768 const char* module_name = (patch_mod_args->at(i))->module_name();
769 Symbol* const module_sym = SymbolTable::lookup(module_name, (int)strlen(module_name), CHECK);
770 assert(module_sym != NULL, "Failed to obtain Symbol for module name");
771 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
772
773 char* class_path = (patch_mod_args->at(i))->path_string();
774 int len = (int)strlen(class_path);
775 int end = 0;
776 // Iterate over the module's class path entries
777 for (int start = 0; start < len; start = end) {
778 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
779 end++;
780 }
781 EXCEPTION_MARK;
782 ResourceMark rm(THREAD);
783 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
784 strncpy(path, &class_path[start], end - start);
785 path[end - start] = '\0';
786
787 struct stat st;
788 if (os::stat(path, &st) == 0) {
789 // File or directory found
790 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
791 // If the path specification is valid, enter it into this module's list
792 if (new_entry != NULL) {
793 module_cpl->add_to_list(new_entry);
794 }
795 }
796
797 while (class_path[end] == os::path_separator()[0]) {
798 end++;
799 }
800 }
801
802 // Record the module into the list of --patch-module entries only if
803 // valid ClassPathEntrys have been created
804 if (module_cpl->module_first_entry() != NULL) {
805 _patch_mod_entries->push(module_cpl);
806 }
807 }
808 }
809
810 // Determine whether the module has been patched via the command-line
811 // option --patch-module
812 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
813 if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) {
814 int table_len = _patch_mod_entries->length();
815 for (int i = 0; i < table_len; i++) {
816 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
817 if (module_name->fast_compare(patch_mod->module_name()) == 0) {
818 return true;
819 }
820 }
821 }
822 return false;
823 }
824
825 // Set up the _jrt_entry if present and boot append path
826 void ClassLoader::setup_boot_search_path(const char *class_path) {
827 int len = (int)strlen(class_path);
828 int end = 0;
829 bool set_base_piece = true;
830
831 #if INCLUDE_CDS
832 if (DumpSharedSpaces) {
833 if (!Arguments::has_jimage()) {
834 vm_exit_during_initialization("CDS is not supported in exploded JDK build", NULL);
835 }
836 }
837 #endif
838
839 // Iterate over class path entries
840 for (int start = 0; start < len; start = end) {
841 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
842 end++;
843 }
844 EXCEPTION_MARK;
845 ResourceMark rm(THREAD);
846 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
847 strncpy(path, &class_path[start], end - start);
848 path[end - start] = '\0';
849
850 if (set_base_piece) {
851 // The first time through the bootstrap_search setup, it must be determined
852 // what the base or core piece of the boot loader search is. Either a java runtime
853 // image is present or this is an exploded module build situation.
854 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
855 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
856 struct stat st;
857 if (os::stat(path, &st) == 0) {
858 // Directory found
859 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
860
861 // Check for a jimage
862 if (Arguments::has_jimage()) {
863 assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice");
864 assert(new_entry != NULL && new_entry->is_modules_image(), "No java runtime image present");
865 _jrt_entry = new_entry;
866 assert(_jrt_entry->jimage() != NULL, "No java runtime image");
867 }
868 } else {
869 // If path does not exist, exit
870 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
871 }
872 set_base_piece = false;
873 } else {
874 // Every entry on the system boot class path after the initial base piece,
875 // which is set by os::set_boot_path(), is considered an appended entry.
876 update_class_path_entry_list(path, false, true);
877 }
878
879 while (class_path[end] == os::path_separator()[0]) {
880 end++;
881 }
882 }
883 }
884
885 // During an exploded modules build, each module defined to the boot loader
886 // will be added to the ClassLoader::_exploded_entries array.
887 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) {
888 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
889 assert(_exploded_entries != NULL, "_exploded_entries was not initialized");
890
891 // Find the module's symbol
892 ResourceMark rm(THREAD);
893 const char *module_name = module_sym->as_C_string();
894 const char *home = Arguments::get_java_home();
895 const char file_sep = os::file_separator()[0];
896 // 10 represents the length of "modules" + 2 file separators + \0
897 size_t len = strlen(home) + strlen(module_name) + 10;
898 char *path = NEW_RESOURCE_ARRAY(char, len);
899 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
900
901 struct stat st;
902 if (os::stat(path, &st) == 0) {
903 // Directory found
904 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
905
906 // If the path specification is valid, enter it into this module's list.
907 // There is no need to check for duplicate modules in the exploded entry list,
908 // since no two modules with the same name can be defined to the boot loader.
909 // This is checked at module definition time in Modules::define_module.
910 if (new_entry != NULL) {
911 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
912 module_cpl->add_to_list(new_entry);
913 {
914 MutexLocker ml(Module_lock, THREAD);
915 _exploded_entries->push(module_cpl);
916 }
917 log_info(class, load)("path: %s", path);
918 }
919 }
920 }
921
922 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
923 bool throw_exception,
924 bool is_boot_append, TRAPS) {
925 JavaThread* thread = JavaThread::current();
926 ClassPathEntry* new_entry = NULL;
927 if ((st->st_mode & S_IFMT) == S_IFREG) {
928 ResourceMark rm(thread);
929 // Regular file, should be a zip or jimage file
930 // Canonicalized filename
931 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
932 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
933 // This matches the classic VM
934 if (throw_exception) {
935 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
936 } else {
937 return NULL;
938 }
939 }
940 jint error;
941 JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
942 if (jimage != NULL) {
943 new_entry = new ClassPathImageEntry(jimage, canonical_path);
944 } else {
945 char* error_msg = NULL;
946 jzfile* zip;
947 {
948 // enable call to C land
949 ThreadToNativeFromVM ttn(thread);
950 HandleMark hm(thread);
951 zip = (*ZipOpen)(canonical_path, &error_msg);
952 }
953 if (zip != NULL && error_msg == NULL) {
954 new_entry = new ClassPathZipEntry(zip, path, is_boot_append);
955 } else {
956 char *msg;
957 if (error_msg == NULL) {
958 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ;
959 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
960 } else {
961 int len = (int)(strlen(path) + strlen(error_msg) + 128);
962 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ;
963 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
964 }
965 // Don't complain about bad jar files added via -Xbootclasspath/a:.
966 if (throw_exception && is_init_completed()) {
967 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
968 } else {
969 return NULL;
970 }
971 }
972 }
973 log_info(class, path)("opened: %s", path);
974 log_info(class, load)("opened: %s", path);
975 } else {
976 // Directory
977 new_entry = new ClassPathDirEntry(path);
978 log_info(class, load)("path: %s", path);
979 }
980 return new_entry;
981 }
982
983
984 // Create a class path zip entry for a given path (return NULL if not found
985 // or zip/JAR file cannot be opened)
986 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
987 // check for a regular file
988 struct stat st;
989 if (os::stat(path, &st) == 0) {
990 if ((st.st_mode & S_IFMT) == S_IFREG) {
991 char canonical_path[JVM_MAXPATHLEN];
992 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
993 char* error_msg = NULL;
994 jzfile* zip;
995 {
996 // enable call to C land
997 JavaThread* thread = JavaThread::current();
998 ThreadToNativeFromVM ttn(thread);
999 HandleMark hm(thread);
1000 zip = (*ZipOpen)(canonical_path, &error_msg);
1001 }
1002 if (zip != NULL && error_msg == NULL) {
1003 // create using canonical path
1004 return new ClassPathZipEntry(zip, canonical_path, is_boot_append);
1005 }
1006 }
1007 }
1008 }
1009 return NULL;
1010 }
1011
1012 // returns true if entry already on class path
1013 bool ClassLoader::contains_append_entry(const char* name) {
1014 ClassPathEntry* e = _first_append_entry;
1015 while (e != NULL) {
1016 // assume zip entries have been canonicalized
1017 if (strcmp(name, e->name()) == 0) {
1018 return true;
1019 }
1020 e = e->next();
1021 }
1022 return false;
1023 }
1024
1025 void ClassLoader::add_to_boot_append_entries(ClassPathEntry *new_entry) {
1026 if (new_entry != NULL) {
1027 if (_last_append_entry == NULL) {
1028 assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty");
1029 _first_append_entry = _last_append_entry = new_entry;
1030 } else {
1031 _last_append_entry->set_next(new_entry);
1032 _last_append_entry = new_entry;
1033 }
1034 }
1035 }
1036
1037 // Record the path entries specified in -cp during dump time. The recorded
1038 // information will be used at runtime for loading the archived app classes.
1039 //
1040 // Note that at dump time, ClassLoader::_app_classpath_entries are NOT used for
1041 // loading app classes. Instead, the app class are loaded by the
1042 // jdk/internal/loader/ClassLoaders$AppClassLoader instance.
1043 void ClassLoader::add_to_app_classpath_entries(const char* path,
1044 ClassPathEntry* entry,
1045 bool check_for_duplicates) {
1046 #if INCLUDE_CDS
1047 assert(entry != NULL, "ClassPathEntry should not be NULL");
1048 ClassPathEntry* e = _app_classpath_entries;
1049 if (check_for_duplicates) {
1050 while (e != NULL) {
1051 if (strcmp(e->name(), entry->name()) == 0) {
1052 // entry already exists
1053 return;
1054 }
1055 e = e->next();
1056 }
1057 }
1058
1059 // The entry does not exist, add to the list
1060 if (_app_classpath_entries == NULL) {
1061 assert(_last_app_classpath_entry == NULL, "Sanity");
1062 _app_classpath_entries = _last_app_classpath_entry = entry;
1063 } else {
1064 _last_app_classpath_entry->set_next(entry);
1065 _last_app_classpath_entry = entry;
1066 }
1067
1068 if (entry->is_jar_file()) {
1069 ClassLoaderExt::process_jar_manifest(entry, check_for_duplicates);
1070 }
1071 #endif
1072 }
1073
1074 // Returns true IFF the file/dir exists and the entry was successfully created.
1075 bool ClassLoader::update_class_path_entry_list(const char *path,
1076 bool check_for_duplicates,
1077 bool is_boot_append,
1078 bool throw_exception) {
1079 struct stat st;
1080 if (os::stat(path, &st) == 0) {
1081 // File or directory found
1082 ClassPathEntry* new_entry = NULL;
1083 Thread* THREAD = Thread::current();
1084 new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false));
1085 if (new_entry == NULL) {
1086 return false;
1087 }
1088
1089 // Do not reorder the bootclasspath which would break get_system_package().
1090 // Add new entry to linked list
1091 if (is_boot_append) {
1092 add_to_boot_append_entries(new_entry);
1093 } else {
1094 add_to_app_classpath_entries(path, new_entry, check_for_duplicates);
1095 }
1096 return true;
1097 } else {
1098 #if INCLUDE_CDS
1099 if (DumpSharedSpaces) {
1100 _shared_paths_misc_info->add_nonexist_path(path);
1101 }
1102 #endif
1103 return false;
1104 }
1105 }
1106
1107 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
1108 ResourceMark rm;
1109 int num_of_entries = module_list->length();
1110 for (int i = 0; i < num_of_entries; i++) {
1111 ClassPathEntry* e;
1112 ModuleClassPathList* mpl = module_list->at(i);
1113 tty->print("%s=", mpl->module_name()->as_C_string());
1114 e = mpl->module_first_entry();
1115 while (e != NULL) {
1116 tty->print("%s", e->name());
1117 e = e->next();
1118 if (e != NULL) {
1119 tty->print("%s", os::path_separator());
1120 }
1121 }
1122 tty->print(" ;");
1123 }
1124 }
1125
1126 void ClassLoader::print_bootclasspath() {
1127 ClassPathEntry* e;
1128 tty->print("[bootclasspath= ");
1129
1130 // Print --patch-module module/path specifications first
1131 if (_patch_mod_entries != NULL) {
1132 print_module_entry_table(_patch_mod_entries);
1133 }
1134
1135 // [jimage | exploded modules build]
1136 if (has_jrt_entry()) {
1137 // Print the location of the java runtime image
1138 tty->print("%s ;", _jrt_entry->name());
1139 } else {
1140 // Print exploded module build path specifications
1141 if (_exploded_entries != NULL) {
1142 print_module_entry_table(_exploded_entries);
1143 }
1144 }
1145
1146 // appended entries
1147 e = _first_append_entry;
1148 while (e != NULL) {
1149 tty->print("%s ;", e->name());
1150 e = e->next();
1151 }
1152 tty->print_cr("]");
1153 }
1154
1155 void ClassLoader::load_zip_library() {
1156 assert(ZipOpen == NULL, "should not load zip library twice");
1157 // First make sure native library is loaded
1158 os::native_java_library();
1159 // Load zip library
1160 char path[JVM_MAXPATHLEN];
1161 char ebuf[1024];
1162 void* handle = NULL;
1163 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
1164 handle = os::dll_load(path, ebuf, sizeof ebuf);
1165 }
1166 if (handle == NULL) {
1167 vm_exit_during_initialization("Unable to load ZIP library", path);
1168 }
1169 // Lookup zip entry points
1170 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
1171 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
1172 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
1173 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
1174 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
1175 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
1176 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
1177
1178 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
1179 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
1180 GetNextEntry == NULL || Crc32 == NULL) {
1181 vm_exit_during_initialization("Corrupted ZIP library", path);
1182 }
1183
1184 if (ZipInflateFully == NULL) {
1185 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
1186 }
1187
1188 // Lookup canonicalize entry in libjava.dll
1189 void *javalib_handle = os::native_java_library();
1190 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
1191 // This lookup only works on 1.3. Do not check for non-null here
1192 }
1193
1194 void ClassLoader::load_jimage_library() {
1195 // First make sure native library is loaded
1196 os::native_java_library();
1197 // Load jimage library
1198 char path[JVM_MAXPATHLEN];
1199 char ebuf[1024];
1200 void* handle = NULL;
1201 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
1202 handle = os::dll_load(path, ebuf, sizeof ebuf);
1203 }
1204 if (handle == NULL) {
1205 vm_exit_during_initialization("Unable to load jimage library", path);
1206 }
1207
1208 // Lookup jimage entry points
1209 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open"));
1210 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found");
1211 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close"));
1212 guarantee(JImageClose != NULL, "function JIMAGE_Close not found");
1213 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule"));
1214 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found");
1215 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource"));
1216 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found");
1217 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource"));
1218 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found");
1219 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator"));
1220 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found");
1221 JImageResourcePath = CAST_TO_FN_PTR(JImage_ResourcePath_t, os::dll_lookup(handle, "JIMAGE_ResourcePath"));
1222 guarantee(JImageResourcePath != NULL, "function JIMAGE_ResourcePath not found");
1223 }
1224
1225 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
1226 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
1227 }
1228
1229 int ClassLoader::crc32(int crc, const char* buf, int len) {
1230 assert(Crc32 != NULL, "ZIP_CRC32 is not found");
1231 return (*Crc32)(crc, (const jbyte*)buf, len);
1232 }
1233
1234 // Function add_package extracts the package from the fully qualified class name
1235 // and checks if the package is in the boot loader's package entry table. If so,
1236 // then it sets the classpath_index in the package entry record.
1237 //
1238 // The classpath_index field is used to find the entry on the boot loader class
1239 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
1240 // in an unnamed module. It is also used to indicate (for all packages whose
1241 // classes are loaded by the boot loader) that at least one of the package's
1242 // classes has been loaded.
1243 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) {
1244 assert(fullq_class_name != NULL, "just checking");
1245
1246 // Get package name from fully qualified class name.
1247 ResourceMark rm;
1248 const char *cp = package_from_name(fullq_class_name);
1249 if (cp != NULL) {
1250 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();
1251 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp, CHECK_false);
1252 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol);
1253 if (pkg_entry != NULL) {
1254 assert(classpath_index != -1, "Unexpected classpath_index");
1255 pkg_entry->set_classpath_index(classpath_index);
1256 } else {
1257 return false;
1258 }
1259 }
1260 return true;
1261 }
1262
1263 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1264 // Look up the name in the boot loader's package entry table.
1265 if (name != NULL) {
1266 TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL);
1267 // Look for the package entry in the boot loader's package entry table.
1268 PackageEntry* package =
1269 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1270
1271 // Return NULL if package does not exist or if no classes in that package
1272 // have been loaded.
1273 if (package != NULL && package->has_loaded_class()) {
1274 ModuleEntry* module = package->module();
1275 if (module->location() != NULL) {
1276 ResourceMark rm(THREAD);
1277 Handle ml = java_lang_String::create_from_str(
1278 module->location()->as_C_string(), THREAD);
1279 return ml();
1280 }
1281 // Return entry on boot loader class path.
1282 Handle cph = java_lang_String::create_from_str(
1283 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1284 return cph();
1285 }
1286 }
1287 return NULL;
1288 }
1289
1290 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1291 ResourceMark rm(THREAD);
1292 // List of pointers to PackageEntrys that have loaded classes.
1293 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
1294 {
1295 MutexLocker ml(Module_lock, THREAD);
1296
1297 PackageEntryTable* pe_table =
1298 ClassLoaderData::the_null_class_loader_data()->packages();
1299
1300 // Collect the packages that have at least one loaded class.
1301 for (int x = 0; x < pe_table->table_size(); x++) {
1302 for (PackageEntry* package_entry = pe_table->bucket(x);
1303 package_entry != NULL;
1304 package_entry = package_entry->next()) {
1305 if (package_entry->has_loaded_class()) {
1306 loaded_class_pkgs->append(package_entry);
1307 }
1308 }
1309 }
1310 }
1311
1312
1313 // Allocate objArray and fill with java.lang.String
1314 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1315 loaded_class_pkgs->length(), CHECK_NULL);
1316 objArrayHandle result(THREAD, r);
1317 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1318 PackageEntry* package_entry = loaded_class_pkgs->at(x);
1319 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1320 result->obj_at_put(x, str());
1321 }
1322 return result();
1323 }
1324
1325 // caller needs ResourceMark
1326 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1327 int class_name_len) {
1328 assert(class_name != NULL, "invariant");
1329 assert((int)strlen(class_name) == class_name_len, "invariant");
1330
1331 static const char class_suffix[] = ".class";
1332
1333 char* const file_name = NEW_RESOURCE_ARRAY(char,
1334 class_name_len +
1335 sizeof(class_suffix)); // includes term NULL
1336
1337 strncpy(file_name, class_name, class_name_len);
1338 strncpy(&file_name[class_name_len], class_suffix, sizeof(class_suffix));
1339
1340 return file_name;
1341 }
1342
1343 ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
1344 const GrowableArray<ModuleClassPathList*>* const module_list) {
1345 int num_of_entries = module_list->length();
1346 const Symbol* class_module_name = mod_entry->name();
1347
1348 // Loop through all the modules in either the patch-module or exploded entries looking for module
1349 for (int i = 0; i < num_of_entries; i++) {
1350 ModuleClassPathList* module_cpl = module_list->at(i);
1351 Symbol* module_cpl_name = module_cpl->module_name();
1352
1353 if (module_cpl_name->fast_compare(class_module_name) == 0) {
1354 // Class' module has been located.
1355 return module_cpl->module_first_entry();
1356 }
1357 }
1358 return NULL;
1359 }
1360
1361
1362 // Search either the patch-module or exploded build entries for class.
1363 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list,
1364 const char* const class_name,
1365 const char* const file_name,
1366 TRAPS) {
1367 ClassFileStream* stream = NULL;
1368
1369 // Find the class' defining module in the boot loader's module entry table
1370 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
1371 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL;
1372
1373 // If the module system has not defined java.base yet, then
1374 // classes loaded are assumed to be defined to java.base.
1375 // When java.base is eventually defined by the module system,
1376 // all packages of classes that have been previously loaded
1377 // are verified in ModuleEntryTable::verify_javabase_packages().
1378 if (!Universe::is_module_initialized() &&
1379 !ModuleEntryTable::javabase_defined() &&
1380 mod_entry == NULL) {
1381 mod_entry = ModuleEntryTable::javabase_moduleEntry();
1382 }
1383
1384 // The module must be a named module
1385 ClassPathEntry* e = NULL;
1386 if (mod_entry != NULL && mod_entry->is_named()) {
1387 if (module_list == _exploded_entries) {
1388 // The exploded build entries can be added to at any time so a lock is
1389 // needed when searching them.
1390 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
1391 MutexLocker ml(Module_lock, THREAD);
1392 e = find_first_module_cpe(mod_entry, module_list);
1393 } else {
1394 e = find_first_module_cpe(mod_entry, module_list);
1395 }
1396 }
1397
1398 // Try to load the class from the module's ClassPathEntry list.
1399 while (e != NULL) {
1400 stream = e->open_stream(file_name, CHECK_NULL);
1401 // No context.check is required since CDS is not supported
1402 // for an exploded modules build or if --patch-module is specified.
1403 if (NULL != stream) {
1404 return stream;
1405 }
1406 e = e->next();
1407 }
1408 // If the module was located, break out even if the class was not
1409 // located successfully from that module's ClassPathEntry list.
1410 // There will not be another valid entry for that module.
1411 return NULL;
1412 }
1413
1414 // Called by the boot classloader to load classes
1415 InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1416 assert(name != NULL, "invariant");
1417 assert(THREAD->is_Java_thread(), "must be a JavaThread");
1418
1419 ResourceMark rm(THREAD);
1420 HandleMark hm(THREAD);
1421
1422 const char* const class_name = name->as_C_string();
1423
1424 EventMark m("loading class %s", class_name);
1425
1426 const char* const file_name = file_name_for_class_name(class_name,
1427 name->utf8_length());
1428 assert(file_name != NULL, "invariant");
1429
1430 ClassLoaderExt::Context context(class_name, file_name, THREAD);
1431
1432 // Lookup stream for parsing .class file
1433 ClassFileStream* stream = NULL;
1434 s2 classpath_index = 0;
1435 ClassPathEntry* e = NULL;
1436
1437 // If DumpSharedSpaces is true boot loader visibility boundaries are set to:
1438 // - [jimage] + [_first_append_entry to _last_append_entry] (all path entries).
1439 //
1440 // If search_append_only is true, boot loader visibility boundaries are
1441 // set to be _first_append_entry to the end. This includes:
1442 // [-Xbootclasspath/a]; [jvmti appended entries]
1443 //
1444 // If both DumpSharedSpaces and search_append_only are false, boot loader
1445 // visibility boundaries are set to be the --patch-module entries plus the base piece.
1446 // This would include:
1447 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1448 //
1449
1450 // Load Attempt #1: --patch-module
1451 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1452 // attempt to load the class from those locations specific to the module.
1453 // Specifications to --patch-module can contain a partial number of classes
1454 // that are part of the overall module definition. So if a particular class is not
1455 // found within its module specification, the search should continue to Load Attempt #2.
1456 // Note: The --patch-module entries are never searched if the boot loader's
1457 // visibility boundary is limited to only searching the append entries.
1458 if (_patch_mod_entries != NULL && !search_append_only) {
1459 // At CDS dump time, the --patch-module entries are ignored. That means a
1460 // class is still loaded from the runtime image even if it might
1461 // appear in the _patch_mod_entries. The runtime shared class visibility
1462 // check will determine if a shared class is visible based on the runtime
1463 // environemnt, including the runtime --patch-module setting.
1464 if (!DumpSharedSpaces) {
1465 stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL);
1466 }
1467 }
1468
1469 // Load Attempt #2: [jimage | exploded build]
1470 if (!search_append_only && (NULL == stream)) {
1471 if (has_jrt_entry()) {
1472 e = _jrt_entry;
1473 stream = _jrt_entry->open_stream(file_name, CHECK_NULL);
1474 } else {
1475 // Exploded build - attempt to locate class in its defining module's location.
1476 assert(_exploded_entries != NULL, "No exploded build entries present");
1477 stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL);
1478 }
1479 }
1480
1481 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1482 if ((search_append_only || DumpSharedSpaces) && (NULL == stream)) {
1483 // For the boot loader append path search, the starting classpath_index
1484 // for the appended piece is always 1 to account for either the
1485 // _jrt_entry or the _exploded_entries.
1486 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1487 classpath_index = 1;
1488
1489 e = _first_append_entry;
1490 while (e != NULL) {
1491 stream = e->open_stream(file_name, CHECK_NULL);
1492 if (NULL != stream) {
1493 break;
1494 }
1495 e = e->next();
1496 ++classpath_index;
1497 }
1498 }
1499
1500 if (NULL == stream) {
1501 return NULL;
1502 }
1503
1504 stream->set_verify(context.should_verify(classpath_index));
1505
1506 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1507 Handle protection_domain;
1508
1509 InstanceKlass* result = KlassFactory::create_from_stream(stream,
1510 name,
1511 loader_data,
1512 protection_domain,
1513 NULL, // host_klass
1514 NULL, // cp_patches
1515 THREAD);
1516 if (HAS_PENDING_EXCEPTION) {
1517 if (DumpSharedSpaces) {
1518 tty->print_cr("Preload Error: Failed to load %s", class_name);
1519 }
1520 return NULL;
1521 }
1522
1523 if (!add_package(file_name, classpath_index, THREAD)) {
1524 return NULL;
1525 }
1526
1527 return result;
1528 }
1529
1530 #if INCLUDE_CDS
1531 char* ClassLoader::skip_uri_protocol(char* source) {
1532 if (strncmp(source, "file:", 5) == 0) {
1533 // file: protocol path could start with file:/ or file:///
1534 // locate the char after all the forward slashes
1535 int offset = 5;
1536 while (*(source + offset) == '/') {
1537 offset++;
1538 }
1539 source += offset;
1540 // for non-windows platforms, move back one char as the path begins with a '/'
1541 #ifndef _WINDOWS
1542 source -= 1;
1543 #endif
1544 } else if (strncmp(source, "jrt:/", 5) == 0) {
1545 source += 5;
1546 }
1547 return source;
1548 }
1549
1550 // Record the shared classpath index and loader type for classes loaded
1551 // by the builtin loaders at dump time.
1552 void ClassLoader::record_result(InstanceKlass* ik, const ClassFileStream* stream, TRAPS) {
1553 assert(DumpSharedSpaces, "sanity");
1554 assert(stream != NULL, "sanity");
1555
1556 if (ik->is_anonymous()) {
1557 // We do not archive anonymous classes.
1558 return;
1559 }
1560
1561 oop loader = ik->class_loader();
1562 char* src = (char*)stream->source();
1563 if (src == NULL) {
1564 if (loader == NULL) {
1565 // JFR classes
1566 ik->set_shared_classpath_index(0);
1567 ik->set_class_loader_type(ClassLoader::BOOT_LOADER);
1568 }
1569 return;
1570 }
1571
1572 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build");
1573
1574 ResourceMark rm(THREAD);
1575 int classpath_index = -1;
1576 PackageEntry* pkg_entry = ik->package();
1577
1578 if (FileMapInfo::get_number_of_shared_paths() > 0) {
1579 char* canonical_path = NEW_RESOURCE_ARRAY(char, JVM_MAXPATHLEN);
1580
1581 // save the path from the file: protocol or the module name from the jrt: protocol
1582 // if no protocol prefix is found, path is the same as stream->source()
1583 char* path = skip_uri_protocol(src);
1584 for (int i = 0; i < FileMapInfo::get_number_of_shared_paths(); i++) {
1585 SharedClassPathEntry* ent = FileMapInfo::shared_path(i);
1586 if (get_canonical_path(ent->name(), canonical_path, JVM_MAXPATHLEN)) {
1587 // If the path (from the class stream source) is the same as the shared
1588 // class or module path, then we have a match.
1589 if (strcmp(canonical_path, os::native_path((char*)path)) == 0) {
1590 // NULL pkg_entry and pkg_entry in an unnamed module implies the class
1591 // is from the -cp or boot loader append path which consists of -Xbootclasspath/a
1592 // and jvmti appended entries.
1593 if ((pkg_entry == NULL) || (pkg_entry->in_unnamed_module())) {
1594 // Ensure the index is within the -cp range before assigning
1595 // to the classpath_index.
1596 if (SystemDictionary::is_system_class_loader(loader) &&
1597 (i >= ClassLoaderExt::app_class_paths_start_index()) &&
1598 (i < ClassLoaderExt::app_module_paths_start_index())) {
1599 classpath_index = i;
1600 break;
1601 } else {
1602 if ((i >= 1) &&
1603 (i < ClassLoaderExt::app_class_paths_start_index())) {
1604 // The class must be from boot loader append path which consists of
1605 // -Xbootclasspath/a and jvmti appended entries.
1606 assert(loader == NULL, "sanity");
1607 classpath_index = i;
1608 break;
1609 }
1610 }
1611 } else {
1612 // A class from a named module from the --module-path. Ensure the index is
1613 // within the --module-path range before assigning to the classpath_index.
1614 if ((pkg_entry != NULL) && !(pkg_entry->in_unnamed_module()) && (i > 0)) {
1615 if (i >= ClassLoaderExt::app_module_paths_start_index() &&
1616 i < FileMapInfo::get_number_of_shared_paths()) {
1617 classpath_index = i;
1618 break;
1619 }
1620 }
1621 }
1622 }
1623 // for index 0 and the stream->source() is the modules image or has the jrt: protocol.
1624 // The class must be from the runtime modules image.
1625 if (i == 0 && (is_modules_image(src) || string_starts_with(src, "jrt:"))) {
1626 classpath_index = i;
1627 break;
1628 }
1629 }
1630 }
1631
1632 // No path entry found for this class. Must be a shared class loaded by the
1633 // user defined classloader.
1634 if (classpath_index < 0) {
1635 assert(ik->shared_classpath_index() < 0, "Sanity");
1636 return;
1637 }
1638 } else {
1639 // The shared path table is set up after module system initialization.
1640 // The path table contains no entry before that. Any classes loaded prior
1641 // to the setup of the shared path table must be from the modules image.
1642 assert(is_modules_image(src), "stream must be from modules image");
1643 assert(FileMapInfo::get_number_of_shared_paths() == 0, "shared path table must not have been setup");
1644 classpath_index = 0;
1645 }
1646
1647 const char* const class_name = ik->name()->as_C_string();
1648 const char* const file_name = file_name_for_class_name(class_name,
1649 ik->name()->utf8_length());
1650 assert(file_name != NULL, "invariant");
1651
1652 ClassLoaderExt::Context context(class_name, file_name, CATCH);
1653 context.record_result(ik->name(), classpath_index, ik, THREAD);
1654 }
1655 #endif // INCLUDE_CDS
1656
1657 // Initialize the class loader's access to methods in libzip. Parse and
1658 // process the boot classpath into a list ClassPathEntry objects. Once
1659 // this list has been created, it must not change order (see class PackageInfo)
1660 // it can be appended to and is by jvmti and the kernel vm.
1661
1662 void ClassLoader::initialize() {
1663 EXCEPTION_MARK;
1664
1665 if (UsePerfData) {
1666 // jvmstat performance counters
1667 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1668 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1669 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1670 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1671 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1672 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1673 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1674 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1675 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1676 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1677
1678 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1679 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1680 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1681 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1682 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1683 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1684 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1685 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1686 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1687 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1688 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1689 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1690 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1691
1692
1693 // The following performance counters are added for measuring the impact
1694 // of the bug fix of 6365597. They are mainly focused on finding out
1695 // the behavior of system & user-defined classloader lock, whether
1696 // ClassLoader.loadClass/findClass is being called synchronized or not.
1697 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1698 "systemLoaderLockContentionRate");
1699 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1700 "nonSystemLoaderLockContentionRate");
1701 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1702 "jvmFindLoadedClassNoLockCalls");
1703 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1704 "jvmDefineClassNoLockCalls");
1705
1706 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1707 "jniDefineClassNoLockCalls");
1708
1709 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1710 "unsafeDefineClassCalls");
1711
1712 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1713 "loadInstanceClassFailRate");
1714 }
1715
1716 // lookup zip library entry points
1717 load_zip_library();
1718 // lookup jimage library entry points
1719 load_jimage_library();
1720 #if INCLUDE_CDS
1721 // initialize search path
1722 if (DumpSharedSpaces) {
1723 _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
1724 }
1725 #endif
1726 setup_bootstrap_search_path();
1727 }
1728
1729 #if INCLUDE_CDS
1730 void ClassLoader::initialize_shared_path() {
1731 if (DumpSharedSpaces) {
1732 ClassLoaderExt::setup_search_paths();
1733 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1734 }
1735 }
1736
1737 void ClassLoader::initialize_module_path(TRAPS) {
1738 if (DumpSharedSpaces) {
1739 ClassLoaderExt::setup_module_paths(THREAD);
1740 FileMapInfo::allocate_shared_path_table();
1741 }
1742 }
1743 #endif
1744
1745 jlong ClassLoader::classloader_time_ms() {
1746 return UsePerfData ?
1747 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1748 }
1749
1750 jlong ClassLoader::class_init_count() {
1751 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1752 }
1753
1754 jlong ClassLoader::class_init_time_ms() {
1755 return UsePerfData ?
1756 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1757 }
1758
1759 jlong ClassLoader::class_verify_time_ms() {
1760 return UsePerfData ?
1761 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1762 }
1763
1764 jlong ClassLoader::class_link_count() {
1765 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1766 }
1767
1768 jlong ClassLoader::class_link_time_ms() {
1769 return UsePerfData ?
1770 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1771 }
1772
1773 int ClassLoader::compute_Object_vtable() {
1774 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1775 // code to determine actual value from file
1776 // Would be value '11' if finals were in vtable
1777 int JDK_1_2_Object_vtable_size = 5;
1778 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1779 }
1780
1781
1782 void classLoader_init1() {
1783 ClassLoader::initialize();
1784 }
1785
1786 // Complete the ClassPathEntry setup for the boot loader
1787 void ClassLoader::classLoader_init2(TRAPS) {
1788 // Setup the list of module/path pairs for --patch-module processing
1789 // This must be done after the SymbolTable is created in order
1790 // to use fast_compare on module names instead of a string compare.
1791 if (Arguments::get_patch_mod_prefix() != NULL) {
1792 setup_patch_mod_entries();
1793 }
1794
1795 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
1796 // to successfully determine if java.base has been patched)
1797 create_javabase();
1798
1799 // Setup the initial java.base/path pair for the exploded build entries.
1800 // As more modules are defined during module system initialization, more
1801 // entries will be added to the exploded build array.
1802 if (!has_jrt_entry()) {
1803 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds");
1804 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds");
1805 // Set up the boot loader's _exploded_entries list. Note that this gets
1806 // done before loading any classes, by the same thread that will
1807 // subsequently do the first class load. So, no lock is needed for this.
1808 assert(_exploded_entries == NULL, "Should only get initialized once");
1809 _exploded_entries = new (ResourceObj::C_HEAP, mtModule)
1810 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true);
1811 add_to_exploded_build_list(vmSymbols::java_base(), CHECK);
1812 }
1813 }
1814
1815
1816 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1817 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1818 if (CanonicalizeEntry != NULL) {
1819 JavaThread* THREAD = JavaThread::current();
1820 JNIEnv* env = THREAD->jni_environment();
1821 ResourceMark rm(THREAD);
1822
1823 // os::native_path writes into orig_copy
1824 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1825 strcpy(orig_copy, orig);
1826 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1827 return false;
1828 }
1829 } else {
1830 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1831 strncpy(out, orig, len);
1832 out[len - 1] = '\0';
1833 }
1834 return true;
1835 }
1836
1837 void ClassLoader::create_javabase() {
1838 Thread* THREAD = Thread::current();
1839
1840 // Create java.base's module entry for the boot
1841 // class loader prior to loading j.l.Ojbect.
1842 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1843
1844 // Get module entry table
1845 ModuleEntryTable* null_cld_modules = null_cld->modules();
1846 if (null_cld_modules == NULL) {
1847 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1848 }
1849
1850 {
1851 MutexLocker ml(Module_lock, THREAD);
1852 ModuleEntry* jb_module = null_cld_modules->locked_create_entry_or_null(Handle(),
1853 false, vmSymbols::java_base(), NULL, NULL, null_cld);
1854 if (jb_module == NULL) {
1855 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
1856 }
1857 ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1858 }
1859 }
1860
1861 #ifndef PRODUCT
1862
1863 // CompileTheWorld
1864 //
1865 // Iterates over all class path entries and forces compilation of all methods
1866 // in all classes found. Currently, only zip/jar archives are searched.
1867 //
1868 // The classes are loaded by the Java level bootstrap class loader, and the
1869 // initializer is called. If DelayCompilationDuringStartup is true (default),
1870 // the interpreter will run the initialization code. Note that forcing
1871 // initialization in this way could potentially lead to initialization order
1872 // problems, in which case we could just force the initialization bit to be set.
1873
1874
1875 // We need to iterate over the contents of a zip/jar file, so we replicate the
1876 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1877 // since jzfile already has a void* definition.
1878 //
1879 // Note that this is only used in debug mode.
1880 //
1881 // HotSpot integration note:
1882 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1883
1884
1885 // JDK 1.3 version
1886 typedef struct real_jzentry { /* Zip file entry */
1887 char *name; /* entry name */
1888 jint time; /* modification time */
1889 jint size; /* size of uncompressed data */
1890 jint csize; /* size of compressed data (zero if uncompressed) */
1891 jint crc; /* crc of uncompressed data */
1892 char *comment; /* optional zip file comment */
1893 jbyte *extra; /* optional extra data */
1894 jint pos; /* position of LOC header (if negative) or data */
1895 } real_jzentry;
1896
1897 typedef struct real_jzfile { /* Zip file */
1898 char *name; /* zip file name */
1899 jint refs; /* number of active references */
1900 jint fd; /* open file descriptor */
1901 void *lock; /* read lock */
1902 char *comment; /* zip file comment */
1903 char *msg; /* zip error message */
1904 void *entries; /* array of hash cells */
1905 jint total; /* total number of entries */
1906 unsigned short *table; /* Hash chain heads: indexes into entries */
1907 jint tablelen; /* number of hash eads */
1908 real_jzfile *next; /* next zip file in search list */
1909 jzentry *cache; /* we cache the most recently freed jzentry */
1910 /* Information on metadata names in META-INF directory */
1911 char **metanames; /* array of meta names (may have null names) */
1912 jint metacount; /* number of slots in metanames array */
1913 /* If there are any per-entry comments, they are in the comments array */
1914 char **comments;
1915 } real_jzfile;
1916
1917 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1918 // For now we only compile all methods in all classes in zip/jar files
1919 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1920 tty->cr();
1921 }
1922
1923 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1924 real_jzfile* zip = (real_jzfile*) _zip;
1925 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1926 tty->cr();
1927 // Iterate over all entries in zip file
1928 for (int n = 0; ; n++) {
1929 real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n));
1930 if (ze == NULL) break;
1931 ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1932 }
1933 if (HAS_PENDING_EXCEPTION) {
1934 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1935 CLEAR_PENDING_EXCEPTION;
1936 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1937 tty->print_cr("Increase class metadata storage if a limit was set");
1938 } else {
1939 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1940 }
1941 }
1942 }
1943
1944 void ClassLoader::compile_the_world() {
1945 EXCEPTION_MARK;
1946 HandleMark hm(THREAD);
1947 ResourceMark rm(THREAD);
1948
1949 assert(has_jrt_entry(), "Compile The World not supported with exploded module build");
1950
1951 // Find bootstrap loader
1952 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1953 jlong start = os::javaTimeMillis();
1954
1955 // Compile the world for the modular java runtime image
1956 _jrt_entry->compile_the_world(system_class_loader, CATCH);
1957
1958 // Iterate over all bootstrap class path appended entries
1959 ClassPathEntry* e = _first_append_entry;
1960 while (e != NULL) {
1961 assert(!e->is_modules_image(), "A modular java runtime image is present on the list of appended entries");
1962 e->compile_the_world(system_class_loader, CATCH);
1963 e = e->next();
1964 }
1965 jlong end = os::javaTimeMillis();
1966 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1967 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1968 {
1969 // Print statistics as if before normal exit:
1970 extern void print_statistics();
1971 print_statistics();
1972 }
1973 vm_exit(0);
1974 }
1975
1976 int ClassLoader::_compile_the_world_class_counter = 0;
1977 int ClassLoader::_compile_the_world_method_counter = 0;
1978 static int _codecache_sweep_counter = 0;
1979
1980 // Filter out all exceptions except OOMs
1981 static void clear_pending_exception_if_not_oom(TRAPS) {
1982 if (HAS_PENDING_EXCEPTION &&
1983 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1984 CLEAR_PENDING_EXCEPTION;
1985 }
1986 // The CHECK at the caller will propagate the exception out
1987 }
1988
1989 /**
1990 * Returns if the given method should be compiled when doing compile-the-world.
1991 *
1992 * TODO: This should be a private method in a CompileTheWorld class.
1993 */
1994 static bool can_be_compiled(const methodHandle& m, int comp_level) {
1995 assert(CompileTheWorld, "must be");
1996
1997 // It's not valid to compile a native wrapper for MethodHandle methods
1998 // that take a MemberName appendix since the bytecode signature is not
1999 // correct.
2000 vmIntrinsics::ID iid = m->intrinsic_id();
2001 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
2002 return false;
2003 }
2004
2005 return CompilationPolicy::can_be_compiled(m, comp_level);
2006 }
2007
2008 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
2009 if (string_ends_with(name, ".class")) {
2010 // We have a .class file
2011 int len = (int)strlen(name);
2012 char buffer[2048];
2013 strncpy(buffer, name, len - 6);
2014 buffer[len-6] = 0;
2015 // If the file has a period after removing .class, it's not really a
2016 // valid class file. The class loader will check everything else.
2017 if (strchr(buffer, '.') == NULL) {
2018 _compile_the_world_class_counter++;
2019 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
2020
2021 // Construct name without extension
2022 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
2023 // Use loader to load and initialize class
2024 Klass* k = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
2025 if (k != NULL && !HAS_PENDING_EXCEPTION) {
2026 k->initialize(THREAD);
2027 }
2028 bool exception_occurred = HAS_PENDING_EXCEPTION;
2029 clear_pending_exception_if_not_oom(CHECK);
2030 if (CompileTheWorldPreloadClasses && k != NULL) {
2031 InstanceKlass* ik = InstanceKlass::cast(k);
2032 ConstantPool::preload_and_initialize_all_classes(ik->constants(), THREAD);
2033 if (HAS_PENDING_EXCEPTION) {
2034 // If something went wrong in preloading we just ignore it
2035 clear_pending_exception_if_not_oom(CHECK);
2036 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
2037 }
2038 }
2039
2040 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
2041 if (k == NULL || exception_occurred) {
2042 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
2043 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
2044 } else {
2045 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
2046 // Preload all classes to get around uncommon traps
2047 // Iterate over all methods in class
2048 int comp_level = CompilationPolicy::policy()->initial_compile_level();
2049 InstanceKlass* ik = InstanceKlass::cast(k);
2050 for (int n = 0; n < ik->methods()->length(); n++) {
2051 methodHandle m (THREAD, ik->methods()->at(n));
2052 if (can_be_compiled(m, comp_level)) {
2053 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
2054 // Give sweeper a chance to keep up with CTW
2055 VM_CTWThreshold op;
2056 VMThread::execute(&op);
2057 _codecache_sweep_counter = 0;
2058 }
2059 // Force compilation
2060 CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
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 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
2069 // Clobber the first compile and force second tier compilation
2070 CompiledMethod* nm = m->code();
2071 if (nm != NULL && !m->is_method_handle_intrinsic()) {
2072 // Throw out the code so that the code cache doesn't fill up
2073 nm->make_not_entrant();
2074 }
2075 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
2076 methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
2077 if (HAS_PENDING_EXCEPTION) {
2078 clear_pending_exception_if_not_oom(CHECK);
2079 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
2080 } else {
2081 _compile_the_world_method_counter++;
2082 }
2083 }
2084 } else {
2085 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
2086 }
2087
2088 CompiledMethod* nm = m->code();
2089 if (nm != NULL && !m->is_method_handle_intrinsic()) {
2090 // Throw out the code so that the code cache doesn't fill up
2091 nm->make_not_entrant();
2092 }
2093 }
2094 }
2095 }
2096 }
2097 }
2098 }
2099
2100 #endif //PRODUCT
2101
2102 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
2103 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
2104 void PerfClassTraceTime::initialize() {
2105 if (!UsePerfData) return;
2106
2107 if (_eventp != NULL) {
2108 // increment the event counter
2109 _eventp->inc();
2110 }
2111
2112 // stop the current active thread-local timer to measure inclusive time
2113 _prev_active_event = -1;
2114 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
2115 if (_timers[i].is_active()) {
2116 assert(_prev_active_event == -1, "should have only one active timer");
2117 _prev_active_event = i;
2118 _timers[i].stop();
2119 }
2120 }
2121
2122 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
2123 // start the inclusive timer if not recursively called
2124 _t.start();
2125 }
2126
2127 // start thread-local timer of the given event type
2128 if (!_timers[_event_type].is_active()) {
2129 _timers[_event_type].start();
2130 }
2131 }
2132
2133 PerfClassTraceTime::~PerfClassTraceTime() {
2134 if (!UsePerfData) return;
2135
2136 // stop the thread-local timer as the event completes
2137 // and resume the thread-local timer of the event next on the stack
2138 _timers[_event_type].stop();
2139 jlong selftime = _timers[_event_type].ticks();
2140
2141 if (_prev_active_event >= 0) {
2142 _timers[_prev_active_event].start();
2143 }
2144
2145 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
2146
2147 // increment the counters only on the leaf call
2148 _t.stop();
2149 _timep->inc(_t.ticks());
2150 if (_selftimep != NULL) {
2151 _selftimep->inc(selftime);
2152 }
2153 // add all class loading related event selftime to the accumulated time counter
2154 ClassLoader::perf_accumulated_time()->inc(selftime);
2155
2156 // reset the timer
2157 _timers[_event_type].reset();
2158 }