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 * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg);
84 typedef void (JNICALL *ZipClose_t)(jzfile *zip);
85 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
86 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
87 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n);
88 typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg);
89 typedef jint (JNICALL *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 #if INCLUDE_CDS
274 if (DumpSharedSpaces) {
275 // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so
276 // we should never find a file underneath it -- unless user has added a new file while we are running
277 // the dump, in which case let's quit!
278 ShouldNotReachHere();
279 }
280 #endif
281 // found file, open it
282 int file_handle = os::open(path, 0, 0);
283 if (file_handle != -1) {
284 // read contents into resource array
285 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
286 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
287 // close file
288 os::close(file_handle);
289 // construct ClassFileStream
290 if (num_read == (size_t)st.st_size) {
291 if (UsePerfData) {
292 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
293 }
294 FREE_RESOURCE_ARRAY(char, path, path_len);
295 // Resource allocated
296 return new ClassFileStream(buffer,
297 st.st_size,
298 _dir,
299 ClassFileStream::verify);
300 }
301 }
302 }
303 FREE_RESOURCE_ARRAY(char, path, path_len);
304 return NULL;
305 }
306
307 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name, bool is_boot_append) : ClassPathEntry() {
308 _zip = zip;
309 char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
310 strcpy(copy, zip_name);
311 _zip_name = copy;
312 _is_boot_append = is_boot_append;
313 _multi_versioned = _unknown;
314 }
315
316 ClassPathZipEntry::~ClassPathZipEntry() {
317 if (ZipClose != NULL) {
318 (*ZipClose)(_zip);
319 }
320 FREE_C_HEAP_ARRAY(char, _zip_name);
321 }
322
323 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
324 // enable call to C land
325 JavaThread* thread = JavaThread::current();
326 ThreadToNativeFromVM ttn(thread);
327 // check whether zip archive contains name
328 jint name_len;
329 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
330 if (entry == NULL) return NULL;
331 u1* buffer;
332 char name_buf[128];
333 char* filename;
334 if (name_len < 128) {
335 filename = name_buf;
336 } else {
337 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
338 }
339
340 // read contents into resource array
341 int size = (*filesize) + ((nul_terminate) ? 1 : 0);
342 buffer = NEW_RESOURCE_ARRAY(u1, size);
343 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
344
345 // return result
346 if (nul_terminate) {
347 buffer[*filesize] = 0;
348 }
349 return buffer;
350 }
351
352 #if INCLUDE_CDS
353 u1* ClassPathZipEntry::open_versioned_entry(const char* name, jint* filesize, TRAPS) {
354 u1* buffer = NULL;
355 if (DumpSharedSpaces && !_is_boot_append) {
356 // We presume default is multi-release enabled
357 const char* multi_ver = Arguments::get_property("jdk.util.jar.enableMultiRelease");
358 const char* verstr = Arguments::get_property("jdk.util.jar.version");
359 bool is_multi_ver = (multi_ver == NULL ||
360 strcmp(multi_ver, "true") == 0 ||
361 strcmp(multi_ver, "force") == 0) &&
362 is_multiple_versioned(THREAD);
363 // command line version setting
364 int version = 0;
365 const int base_version = 8; // JDK8
366 int cur_ver = JDK_Version::current().major_version();
367 if (verstr != NULL) {
368 version = atoi(verstr);
369 if (version < base_version || version > cur_ver) {
370 // If the specified version is lower than the base version, the base
371 // entry will be used; if the version is higher than the current
372 // jdk version, the highest versioned entry will be used.
373 if (version < base_version) {
374 is_multi_ver = false;
375 }
376 // print out warning, do not use assertion here since it will continue to look
377 // for proper version.
378 warning("JDK%d is not supported in multiple version jars", version);
379 }
380 }
381
382 if (is_multi_ver) {
383 int n;
384 const char* version_entry = "META-INF/versions/";
385 // 10 is the max length of a decimal 32-bit non-negative number
386 // 2 includes the '/' and trailing zero
387 size_t entry_name_len = strlen(version_entry) + 10 + strlen(name) + 2;
388 char* entry_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, entry_name_len);
389 if (version > 0) {
390 n = jio_snprintf(entry_name, entry_name_len, "%s%d/%s", version_entry, version, name);
391 entry_name[n] = '\0';
392 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
393 if (buffer == NULL) {
394 warning("Could not find %s in %s, try to find highest version instead", entry_name, _zip_name);
395 }
396 }
397 if (buffer == NULL) {
398 for (int i = cur_ver; i >= base_version; i--) {
399 n = jio_snprintf(entry_name, entry_name_len, "%s%d/%s", version_entry, i, name);
400 entry_name[n] = '\0';
401 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
402 if (buffer != NULL) {
403 break;
404 }
405 }
406 }
407 FREE_RESOURCE_ARRAY(char, entry_name, entry_name_len);
408 }
409 }
410 return buffer;
411 }
412
413 bool ClassPathZipEntry::is_multiple_versioned(TRAPS) {
414 assert(DumpSharedSpaces, "called only at dump time");
415 if (_multi_versioned != _unknown) {
416 return (_multi_versioned == _yes) ? true : false;
417 }
418 jint size;
419 char* buffer = (char*)open_entry("META-INF/MANIFEST.MF", &size, true, CHECK_false);
420 if (buffer != NULL) {
421 char* p = buffer;
422 for ( ; *p; ++p) *p = tolower(*p);
423 if (strstr(buffer, "multi-release: true") != NULL) {
424 _multi_versioned = _yes;
425 return true;
426 }
427 }
428 _multi_versioned = _no;
429 return false;
430 }
431 #endif // INCLUDE_CDS
432
433 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
434 jint filesize;
435 u1* buffer = open_versioned_entry(name, &filesize, CHECK_NULL);
436 if (buffer == NULL) {
437 buffer = open_entry(name, &filesize, false, CHECK_NULL);
438 if (buffer == NULL) {
439 return NULL;
440 }
441 }
442 if (UsePerfData) {
443 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
444 }
445 // Resource allocated
446 return new ClassFileStream(buffer,
447 filesize,
448 _zip_name,
449 ClassFileStream::verify);
450 }
451
452 // invoke function for each entry in the zip file
453 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
454 JavaThread* thread = JavaThread::current();
455 HandleMark handle_mark(thread);
456 ThreadToNativeFromVM ttn(thread);
457 for (int n = 0; ; n++) {
458 jzentry * ze = ((*GetNextEntry)(_zip, n));
459 if (ze == NULL) break;
460 (*f)(ze->name, context);
461 }
462 }
463
464 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
465 ClassPathEntry(),
466 _jimage(jimage) {
467 guarantee(jimage != NULL, "jimage file is null");
468 guarantee(name != NULL, "jimage file name is null");
469 size_t len = strlen(name) + 1;
470 _name = NEW_C_HEAP_ARRAY(const char, len, mtClass);
471 strncpy((char *)_name, name, len);
472 }
473
474 ClassPathImageEntry::~ClassPathImageEntry() {
475 if (_name != NULL) {
476 FREE_C_HEAP_ARRAY(const char, _name);
477 _name = NULL;
478 }
479 if (_jimage != NULL) {
480 (*JImageClose)(_jimage);
481 _jimage = NULL;
482 }
483 }
484
485 // For a class in a named module, look it up in the jimage file using this syntax:
486 // /<module-name>/<package-name>/<base-class>
487 //
488 // Assumptions:
489 // 1. There are no unnamed modules in the jimage file.
490 // 2. A package is in at most one module in the jimage file.
491 //
492 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
493 jlong size;
494 JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size);
495
496 if (location == 0) {
497 ResourceMark rm;
498 const char* pkg_name = ClassLoader::package_from_name(name);
499
500 if (pkg_name != NULL) {
501 if (!Universe::is_module_initialized()) {
502 location = (*JImageFindResource)(_jimage, JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
503 #if INCLUDE_CDS
504 // CDS uses the boot class loader to load classes whose packages are in
505 // modules defined for other class loaders. So, for now, get their module
506 // names from the "modules" jimage file.
507 if (DumpSharedSpaces && location == 0) {
508 const char* module_name = (*JImagePackageToModule)(_jimage, pkg_name);
509 if (module_name != NULL) {
510 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
511 }
512 }
513 #endif
514
515 } else {
516 PackageEntry* package_entry = ClassLoader::get_package_entry(name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
517 if (package_entry != NULL) {
518 ResourceMark rm;
519 // Get the module name
520 ModuleEntry* module = package_entry->module();
521 assert(module != NULL, "Boot classLoader package missing module");
522 assert(module->is_named(), "Boot classLoader package is in unnamed module");
523 const char* module_name = module->name()->as_C_string();
524 if (module_name != NULL) {
525 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
526 }
527 }
528 }
529 }
530 }
531 if (location != 0) {
532 if (UsePerfData) {
533 ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
534 }
535 char* data = NEW_RESOURCE_ARRAY(char, size);
536 (*JImageGetResource)(_jimage, location, data, size);
537 // Resource allocated
538 return new ClassFileStream((u1*)data,
539 (int)size,
540 _name,
541 ClassFileStream::verify);
542 }
543
544 return NULL;
545 }
546
547 JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf,
548 const char* module_name,
549 const char* file_name,
550 jlong &size) {
551 return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size));
552 }
553
554 #ifndef PRODUCT
555 bool ctw_visitor(JImageFile* jimage,
556 const char* module_name, const char* version, const char* package,
557 const char* name, const char* extension, void* arg) {
558 if (strcmp(extension, "class") == 0) {
559 Thread* THREAD = Thread::current();
560 ResourceMark rm(THREAD);
561 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JIMAGE_MAX_PATH);
562 jio_snprintf(path, JIMAGE_MAX_PATH - 1, "%s/%s.class", package, name);
563 ClassLoader::compile_the_world_in(path, *(Handle*)arg, THREAD);
564 return !HAS_PENDING_EXCEPTION;
565 }
566 return true;
567 }
568
569 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) {
570 tty->print_cr("CompileTheWorld : Compiling all classes in %s", name());
571 tty->cr();
572 (*JImageResourceIterator)(_jimage, (JImageResourceVisitor_t)ctw_visitor, (void *)&loader);
573 if (HAS_PENDING_EXCEPTION) {
574 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
575 CLEAR_PENDING_EXCEPTION;
576 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
577 tty->print_cr("Increase class metadata storage if a limit was set");
578 } else {
579 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
580 }
581 }
582 }
583 #endif
584
585 bool ClassPathImageEntry::is_modules_image() const {
586 return ClassLoader::is_modules_image(name());
587 }
588
589 #if INCLUDE_CDS
590 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
591 assert(DumpSharedSpaces, "only called at dump time");
592 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure");
593 vm_exit_during_initialization(error, message);
594 }
595 #endif
596
597 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
598 _module_name = module_name;
599 _module_first_entry = NULL;
600 _module_last_entry = NULL;
601 }
602
603 ModuleClassPathList::~ModuleClassPathList() {
604 // Clean out each ClassPathEntry on list
605 ClassPathEntry* e = _module_first_entry;
606 while (e != NULL) {
607 ClassPathEntry* next_entry = e->next();
608 delete e;
609 e = next_entry;
610 }
611 }
612
613 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
614 if (new_entry != NULL) {
615 if (_module_last_entry == NULL) {
616 _module_first_entry = _module_last_entry = new_entry;
617 } else {
618 _module_last_entry->set_next(new_entry);
619 _module_last_entry = new_entry;
620 }
621 }
622 }
623
624 void ClassLoader::trace_class_path(const char* msg, const char* name) {
625 LogTarget(Info, class, path) lt;
626 if (lt.is_enabled()) {
627 LogStream ls(lt);
628 if (msg) {
629 ls.print("%s", msg);
630 }
631 if (name) {
632 if (strlen(name) < 256) {
633 ls.print("%s", name);
634 } else {
635 // For very long paths, we need to print each character separately,
636 // as print_cr() has a length limit
637 while (name[0] != '\0') {
638 ls.print("%c", name[0]);
639 name++;
640 }
641 }
642 }
643 ls.cr();
644 }
645 }
646
647 #if INCLUDE_CDS
648 void ClassLoader::check_shared_classpath(const char *path) {
649 if (strcmp(path, "") == 0) {
650 exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
651 }
652
653 struct stat st;
654 if (os::stat(path, &st) == 0) {
655 if ((st.st_mode & S_IFMT) != S_IFREG) { // is not a regular file
656 if (!os::dir_is_empty(path)) {
657 tty->print_cr("Error: non-empty directory '%s'", path);
658 exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL);
659 }
660 }
661 }
662 }
663 #endif
664
665 void ClassLoader::setup_bootstrap_search_path() {
666 const char* sys_class_path = Arguments::get_sysclasspath();
667 if (PrintSharedArchiveAndExit) {
668 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
669 // the same as the bootcp of the shared archive.
670 } else {
671 trace_class_path("bootstrap loader class path=", sys_class_path);
672 }
673 #if INCLUDE_CDS
674 if (DumpSharedSpaces) {
675 _shared_paths_misc_info->add_boot_classpath(sys_class_path);
676 }
677 #endif
678 setup_boot_search_path(sys_class_path);
679 }
680
681 #if INCLUDE_CDS
682 int ClassLoader::get_shared_paths_misc_info_size() {
683 return _shared_paths_misc_info->get_used_bytes();
684 }
685
686 void* ClassLoader::get_shared_paths_misc_info() {
687 return _shared_paths_misc_info->buffer();
688 }
689
690 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
691 SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
692 bool result = checker->check();
693 delete checker;
694 return result;
695 }
696
697 void ClassLoader::setup_app_search_path(const char *class_path) {
698
699 assert(DumpSharedSpaces, "Sanity");
700
701 Thread* THREAD = Thread::current();
702 int len = (int)strlen(class_path);
703 int end = 0;
704
705 // Iterate over class path entries
706 for (int start = 0; start < len; start = end) {
707 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
708 end++;
709 }
710 EXCEPTION_MARK;
711 ResourceMark rm(THREAD);
712 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
713 strncpy(path, &class_path[start], end - start);
714 path[end - start] = '\0';
715
716 check_shared_classpath(path);
717
718 update_class_path_entry_list(path, false, false);
719
720 while (class_path[end] == os::path_separator()[0]) {
721 end++;
722 }
723 }
724 }
725
726 void ClassLoader::setup_module_search_path(const char* path) {
727 check_shared_classpath(path);
728 update_module_path_entry_list(path);
729 }
730
731 #endif
732
733 // Construct the array of module/path pairs as specified to --patch-module
734 // for the boot loader to search ahead of the jimage, if the class being
735 // loaded is defined to a module that has been specified to --patch-module.
736 void ClassLoader::setup_patch_mod_entries() {
737 Thread* THREAD = Thread::current();
738 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
739 int num_of_entries = patch_mod_args->length();
740
741
742 // Set up the boot loader's _patch_mod_entries list
743 _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true);
744
745 for (int i = 0; i < num_of_entries; i++) {
746 const char* module_name = (patch_mod_args->at(i))->module_name();
747 Symbol* const module_sym = SymbolTable::lookup(module_name, (int)strlen(module_name), CHECK);
748 assert(module_sym != NULL, "Failed to obtain Symbol for module name");
749 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
750
751 char* class_path = (patch_mod_args->at(i))->path_string();
752 int len = (int)strlen(class_path);
753 int end = 0;
754 // Iterate over the module's class path entries
755 for (int start = 0; start < len; start = end) {
756 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
757 end++;
758 }
759 EXCEPTION_MARK;
760 ResourceMark rm(THREAD);
761 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
762 strncpy(path, &class_path[start], end - start);
763 path[end - start] = '\0';
764
765 struct stat st;
766 if (os::stat(path, &st) == 0) {
767 // File or directory found
768 Thread* THREAD = Thread::current();
769 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
770 // If the path specification is valid, enter it into this module's list
771 if (new_entry != NULL) {
772 module_cpl->add_to_list(new_entry);
773 }
774 }
775
776 while (class_path[end] == os::path_separator()[0]) {
777 end++;
778 }
779 }
780
781 // Record the module into the list of --patch-module entries only if
782 // valid ClassPathEntrys have been created
783 if (module_cpl->module_first_entry() != NULL) {
784 _patch_mod_entries->push(module_cpl);
785 }
786 }
787 }
788
789 // Determine whether the module has been patched via the command-line
790 // option --patch-module
791 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
792 if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) {
793 int table_len = _patch_mod_entries->length();
794 for (int i = 0; i < table_len; i++) {
795 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
796 if (module_name->fast_compare(patch_mod->module_name()) == 0) {
797 return true;
798 }
799 }
800 }
801 return false;
802 }
803
804 // Set up the _jrt_entry if present and boot append path
805 void ClassLoader::setup_boot_search_path(const char *class_path) {
806 int len = (int)strlen(class_path);
807 int end = 0;
808 bool set_base_piece = true;
809
810 #if INCLUDE_CDS
811 if (DumpSharedSpaces) {
812 if (!Arguments::has_jimage()) {
813 vm_exit_during_initialization("CDS is not supported in exploded JDK build", NULL);
814 }
815 }
816 #endif
817
818 // Iterate over class path entries
819 for (int start = 0; start < len; start = end) {
820 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
821 end++;
822 }
823 EXCEPTION_MARK;
824 ResourceMark rm(THREAD);
825 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
826 strncpy(path, &class_path[start], end - start);
827 path[end - start] = '\0';
828
829 if (set_base_piece) {
830 // The first time through the bootstrap_search setup, it must be determined
831 // what the base or core piece of the boot loader search is. Either a java runtime
832 // image is present or this is an exploded module build situation.
833 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
834 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
835 struct stat st;
836 if (os::stat(path, &st) == 0) {
837 // Directory found
838 Thread* THREAD = Thread::current();
839 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
840
841 // Check for a jimage
842 if (Arguments::has_jimage()) {
843 assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice");
844 assert(new_entry != NULL && new_entry->is_modules_image(), "No java runtime image present");
845 _jrt_entry = new_entry;
846 assert(_jrt_entry->jimage() != NULL, "No java runtime image");
847 }
848 } else {
849 // If path does not exist, exit
850 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
851 }
852 set_base_piece = false;
853 } else {
854 // Every entry on the system boot class path after the initial base piece,
855 // which is set by os::set_boot_path(), is considered an appended entry.
856 update_class_path_entry_list(path, false, true);
857 }
858
859 #if INCLUDE_CDS
860 if (DumpSharedSpaces) {
861 check_shared_classpath(path);
862 }
863 #endif
864 while (class_path[end] == os::path_separator()[0]) {
865 end++;
866 }
867 }
868 }
869
870 // During an exploded modules build, each module defined to the boot loader
871 // will be added to the ClassLoader::_exploded_entries array.
872 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) {
873 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
874 assert(_exploded_entries != NULL, "_exploded_entries was not initialized");
875
876 // Find the module's symbol
877 ResourceMark rm(THREAD);
878 const char *module_name = module_sym->as_C_string();
879 const char *home = Arguments::get_java_home();
880 const char file_sep = os::file_separator()[0];
881 // 10 represents the length of "modules" + 2 file separators + \0
882 size_t len = strlen(home) + strlen(module_name) + 10;
883 char *path = NEW_C_HEAP_ARRAY(char, len, mtModule);
884 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
885
886 struct stat st;
887 if (os::stat(path, &st) == 0) {
888 // Directory found
889 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
890
891 // If the path specification is valid, enter it into this module's list.
892 // There is no need to check for duplicate modules in the exploded entry list,
893 // since no two modules with the same name can be defined to the boot loader.
894 // This is checked at module definition time in Modules::define_module.
895 if (new_entry != NULL) {
896 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
897 module_cpl->add_to_list(new_entry);
898 {
899 MutexLocker ml(Module_lock, THREAD);
900 _exploded_entries->push(module_cpl);
901 }
902 log_info(class, load)("path: %s", path);
903 }
904 }
905 FREE_C_HEAP_ARRAY(char, path);
906 }
907
908 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
909 bool throw_exception,
910 bool is_boot_append, TRAPS) {
911 JavaThread* thread = JavaThread::current();
912 ClassPathEntry* new_entry = NULL;
913 if ((st->st_mode & S_IFMT) == S_IFREG) {
914 ResourceMark rm(thread);
915 // Regular file, should be a zip or jimage file
916 // Canonicalized filename
917 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
918 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
919 // This matches the classic VM
920 if (throw_exception) {
921 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
922 } else {
923 return NULL;
924 }
925 }
926 jint error;
927 JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
928 if (jimage != NULL) {
929 new_entry = new ClassPathImageEntry(jimage, canonical_path);
930 } else {
931 char* error_msg = NULL;
932 jzfile* zip;
933 {
934 // enable call to C land
935 ThreadToNativeFromVM ttn(thread);
936 HandleMark hm(thread);
937 zip = (*ZipOpen)(canonical_path, &error_msg);
938 }
939 if (zip != NULL && error_msg == NULL) {
940 new_entry = new ClassPathZipEntry(zip, path, is_boot_append);
941 } else {
942 char *msg;
943 if (error_msg == NULL) {
944 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ;
945 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
946 } else {
947 int len = (int)(strlen(path) + strlen(error_msg) + 128);
948 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ;
949 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
950 }
951 // Don't complain about bad jar files added via -Xbootclasspath/a:.
952 if (throw_exception && is_init_completed()) {
953 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
954 } else {
955 return NULL;
956 }
957 }
958 }
959 log_info(class, path)("opened: %s", path);
960 log_info(class, load)("opened: %s", path);
961 } else {
962 // Directory
963 new_entry = new ClassPathDirEntry(path);
964 log_info(class, load)("path: %s", path);
965 }
966 return new_entry;
967 }
968
969
970 // Create a class path zip entry for a given path (return NULL if not found
971 // or zip/JAR file cannot be opened)
972 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
973 // check for a regular file
974 struct stat st;
975 if (os::stat(path, &st) == 0) {
976 if ((st.st_mode & S_IFMT) == S_IFREG) {
977 char canonical_path[JVM_MAXPATHLEN];
978 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
979 char* error_msg = NULL;
980 jzfile* zip;
981 {
982 // enable call to C land
983 JavaThread* thread = JavaThread::current();
984 ThreadToNativeFromVM ttn(thread);
985 HandleMark hm(thread);
986 zip = (*ZipOpen)(canonical_path, &error_msg);
987 }
988 if (zip != NULL && error_msg == NULL) {
989 // create using canonical path
990 return new ClassPathZipEntry(zip, canonical_path, is_boot_append);
991 }
992 }
993 }
994 }
995 return NULL;
996 }
997
998 // returns true if entry already on class path
999 bool ClassLoader::contains_append_entry(const char* name) {
1000 ClassPathEntry* e = _first_append_entry;
1001 while (e != NULL) {
1002 // assume zip entries have been canonicalized
1003 if (strcmp(name, e->name()) == 0) {
1004 return true;
1005 }
1006 e = e->next();
1007 }
1008 return false;
1009 }
1010
1011 void ClassLoader::add_to_boot_append_entries(ClassPathEntry *new_entry) {
1012 if (new_entry != NULL) {
1013 if (_last_append_entry == NULL) {
1014 assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty");
1015 _first_append_entry = _last_append_entry = new_entry;
1016 } else {
1017 _last_append_entry->set_next(new_entry);
1018 _last_append_entry = new_entry;
1019 }
1020 }
1021 }
1022
1023 // Record the path entries specified in -cp during dump time. The recorded
1024 // information will be used at runtime for loading the archived app classes.
1025 //
1026 // Note that at dump time, ClassLoader::_app_classpath_entries are NOT used for
1027 // loading app classes. Instead, the app class are loaded by the
1028 // jdk/internal/loader/ClassLoaders$AppClassLoader instance.
1029 void ClassLoader::add_to_app_classpath_entries(const char* path,
1030 ClassPathEntry* entry,
1031 bool check_for_duplicates) {
1032 #if INCLUDE_CDS
1033 assert(entry != NULL, "ClassPathEntry should not be NULL");
1034 ClassPathEntry* e = _app_classpath_entries;
1035 if (check_for_duplicates) {
1036 while (e != NULL) {
1037 if (strcmp(e->name(), entry->name()) == 0) {
1038 // entry already exists
1039 return;
1040 }
1041 e = e->next();
1042 }
1043 }
1044
1045 // The entry does not exist, add to the list
1046 if (_app_classpath_entries == NULL) {
1047 assert(_last_app_classpath_entry == NULL, "Sanity");
1048 _app_classpath_entries = _last_app_classpath_entry = entry;
1049 } else {
1050 _last_app_classpath_entry->set_next(entry);
1051 _last_app_classpath_entry = entry;
1052 }
1053
1054 if (entry->is_jar_file()) {
1055 ClassLoaderExt::process_jar_manifest(entry, check_for_duplicates);
1056 } else {
1057 if (!os::dir_is_empty(path)) {
1058 tty->print_cr("Error: non-empty directory '%s'", path);
1059 exit_with_path_failure("Cannot have non-empty directory in app classpaths", NULL);
1060 }
1061 }
1062 #endif
1063 }
1064
1065 // Returns true IFF the file/dir exists and the entry was successfully created.
1066 bool ClassLoader::update_class_path_entry_list(const char *path,
1067 bool check_for_duplicates,
1068 bool is_boot_append,
1069 bool throw_exception) {
1070 struct stat st;
1071 if (os::stat(path, &st) == 0) {
1072 // File or directory found
1073 ClassPathEntry* new_entry = NULL;
1074 Thread* THREAD = Thread::current();
1075 new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false));
1076 if (new_entry == NULL) {
1077 return false;
1078 }
1079
1080 // Do not reorder the bootclasspath which would break get_system_package().
1081 // Add new entry to linked list
1082 if (is_boot_append) {
1083 add_to_boot_append_entries(new_entry);
1084 } else {
1085 add_to_app_classpath_entries(path, new_entry, check_for_duplicates);
1086 }
1087 return true;
1088 } else {
1089 #if INCLUDE_CDS
1090 if (DumpSharedSpaces) {
1091 _shared_paths_misc_info->add_nonexist_path(path);
1092 }
1093 #endif
1094 return false;
1095 }
1096 }
1097
1098 #if INCLUDE_CDS
1099 void ClassLoader::add_to_module_path_entries(const char* path,
1100 ClassPathEntry* entry) {
1101 assert(entry != NULL, "ClassPathEntry should not be NULL");
1102 ClassPathEntry* e = _module_path_entries;
1103
1104 // The entry does not exist, add to the list
1105 if (_module_path_entries == NULL) {
1106 assert(_last_module_path_entry == NULL, "Sanity");
1107 _module_path_entries = _last_module_path_entry = entry;
1108 } else {
1109 _last_module_path_entry->set_next(entry);
1110 _last_module_path_entry = entry;
1111 }
1112 }
1113
1114 // Add a module path to the _module_path_entries list.
1115 void ClassLoader::update_module_path_entry_list(const char *path,
1116 bool throw_exception) {
1117 struct stat st;
1118 assert(os::stat(path, &st) == 0, "module path must exist");
1119 // File or directory found
1120 ClassPathEntry* new_entry = NULL;
1121 Thread* THREAD = Thread::current();
1122 new_entry = create_class_path_entry(path, &st, throw_exception,
1123 false /*is_boot_append */, CHECK);
1124 if (new_entry == NULL) {
1125 return;
1126 }
1127
1128 add_to_module_path_entries(path, new_entry);
1129 return;
1130 }
1131 #endif // INCLUDE_CDS
1132
1133 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
1134 ResourceMark rm;
1135 int num_of_entries = module_list->length();
1136 for (int i = 0; i < num_of_entries; i++) {
1137 ClassPathEntry* e;
1138 ModuleClassPathList* mpl = module_list->at(i);
1139 tty->print("%s=", mpl->module_name()->as_C_string());
1140 e = mpl->module_first_entry();
1141 while (e != NULL) {
1142 tty->print("%s", e->name());
1143 e = e->next();
1144 if (e != NULL) {
1145 tty->print("%s", os::path_separator());
1146 }
1147 }
1148 tty->print(" ;");
1149 }
1150 }
1151
1152 void ClassLoader::print_bootclasspath() {
1153 ClassPathEntry* e;
1154 tty->print("[bootclasspath= ");
1155
1156 // Print --patch-module module/path specifications first
1157 if (_patch_mod_entries != NULL) {
1158 print_module_entry_table(_patch_mod_entries);
1159 }
1160
1161 // [jimage | exploded modules build]
1162 if (has_jrt_entry()) {
1163 // Print the location of the java runtime image
1164 tty->print("%s ;", _jrt_entry->name());
1165 } else {
1166 // Print exploded module build path specifications
1167 if (_exploded_entries != NULL) {
1168 print_module_entry_table(_exploded_entries);
1169 }
1170 }
1171
1172 // appended entries
1173 e = _first_append_entry;
1174 while (e != NULL) {
1175 tty->print("%s ;", e->name());
1176 e = e->next();
1177 }
1178 tty->print_cr("]");
1179 }
1180
1181 void ClassLoader::load_zip_library() {
1182 assert(ZipOpen == NULL, "should not load zip library twice");
1183 // First make sure native library is loaded
1184 os::native_java_library();
1185 // Load zip library
1186 char path[JVM_MAXPATHLEN];
1187 char ebuf[1024];
1188 void* handle = NULL;
1189 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
1190 handle = os::dll_load(path, ebuf, sizeof ebuf);
1191 }
1192 if (handle == NULL) {
1193 vm_exit_during_initialization("Unable to load ZIP library", path);
1194 }
1195 // Lookup zip entry points
1196 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
1197 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
1198 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
1199 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
1200 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
1201 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
1202 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
1203
1204 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
1205 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
1206 GetNextEntry == NULL || Crc32 == NULL) {
1207 vm_exit_during_initialization("Corrupted ZIP library", path);
1208 }
1209
1210 if (ZipInflateFully == NULL) {
1211 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
1212 }
1213
1214 // Lookup canonicalize entry in libjava.dll
1215 void *javalib_handle = os::native_java_library();
1216 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
1217 // This lookup only works on 1.3. Do not check for non-null here
1218 }
1219
1220 void ClassLoader::load_jimage_library() {
1221 // First make sure native library is loaded
1222 os::native_java_library();
1223 // Load jimage library
1224 char path[JVM_MAXPATHLEN];
1225 char ebuf[1024];
1226 void* handle = NULL;
1227 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
1228 handle = os::dll_load(path, ebuf, sizeof ebuf);
1229 }
1230 if (handle == NULL) {
1231 vm_exit_during_initialization("Unable to load jimage library", path);
1232 }
1233
1234 // Lookup jimage entry points
1235 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open"));
1236 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found");
1237 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close"));
1238 guarantee(JImageClose != NULL, "function JIMAGE_Close not found");
1239 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule"));
1240 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found");
1241 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource"));
1242 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found");
1243 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource"));
1244 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found");
1245 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator"));
1246 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found");
1247 JImageResourcePath = CAST_TO_FN_PTR(JImage_ResourcePath_t, os::dll_lookup(handle, "JIMAGE_ResourcePath"));
1248 guarantee(JImageResourcePath != NULL, "function JIMAGE_ResourcePath not found");
1249 }
1250
1251 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
1252 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
1253 }
1254
1255 int ClassLoader::crc32(int crc, const char* buf, int len) {
1256 assert(Crc32 != NULL, "ZIP_CRC32 is not found");
1257 return (*Crc32)(crc, (const jbyte*)buf, len);
1258 }
1259
1260 // Function add_package extracts the package from the fully qualified class name
1261 // and checks if the package is in the boot loader's package entry table. If so,
1262 // then it sets the classpath_index in the package entry record.
1263 //
1264 // The classpath_index field is used to find the entry on the boot loader class
1265 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
1266 // in an unnamed module. It is also used to indicate (for all packages whose
1267 // classes are loaded by the boot loader) that at least one of the package's
1268 // classes has been loaded.
1269 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) {
1270 assert(fullq_class_name != NULL, "just checking");
1271
1272 // Get package name from fully qualified class name.
1273 ResourceMark rm;
1274 const char *cp = package_from_name(fullq_class_name);
1275 if (cp != NULL) {
1276 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();
1277 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp, CHECK_false);
1278 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol);
1279 if (pkg_entry != NULL) {
1280 assert(classpath_index != -1, "Unexpected classpath_index");
1281 pkg_entry->set_classpath_index(classpath_index);
1282 } else {
1283 return false;
1284 }
1285 }
1286 return true;
1287 }
1288
1289 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1290 // Look up the name in the boot loader's package entry table.
1291 if (name != NULL) {
1292 TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL);
1293 // Look for the package entry in the boot loader's package entry table.
1294 PackageEntry* package =
1295 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1296
1297 // Return NULL if package does not exist or if no classes in that package
1298 // have been loaded.
1299 if (package != NULL && package->has_loaded_class()) {
1300 ModuleEntry* module = package->module();
1301 if (module->location() != NULL) {
1302 ResourceMark rm(THREAD);
1303 Handle ml = java_lang_String::create_from_str(
1304 module->location()->as_C_string(), THREAD);
1305 return ml();
1306 }
1307 // Return entry on boot loader class path.
1308 Handle cph = java_lang_String::create_from_str(
1309 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1310 return cph();
1311 }
1312 }
1313 return NULL;
1314 }
1315
1316 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1317 ResourceMark rm(THREAD);
1318 // List of pointers to PackageEntrys that have loaded classes.
1319 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
1320 {
1321 MutexLocker ml(Module_lock, THREAD);
1322
1323 PackageEntryTable* pe_table =
1324 ClassLoaderData::the_null_class_loader_data()->packages();
1325
1326 // Collect the packages that have at least one loaded class.
1327 for (int x = 0; x < pe_table->table_size(); x++) {
1328 for (PackageEntry* package_entry = pe_table->bucket(x);
1329 package_entry != NULL;
1330 package_entry = package_entry->next()) {
1331 if (package_entry->has_loaded_class()) {
1332 loaded_class_pkgs->append(package_entry);
1333 }
1334 }
1335 }
1336 }
1337
1338
1339 // Allocate objArray and fill with java.lang.String
1340 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1341 loaded_class_pkgs->length(), CHECK_NULL);
1342 objArrayHandle result(THREAD, r);
1343 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1344 PackageEntry* package_entry = loaded_class_pkgs->at(x);
1345 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1346 result->obj_at_put(x, str());
1347 }
1348 return result();
1349 }
1350
1351 // caller needs ResourceMark
1352 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1353 int class_name_len) {
1354 assert(class_name != NULL, "invariant");
1355 assert((int)strlen(class_name) == class_name_len, "invariant");
1356
1357 static const char class_suffix[] = ".class";
1358
1359 char* const file_name = NEW_RESOURCE_ARRAY(char,
1360 class_name_len +
1361 sizeof(class_suffix)); // includes term NULL
1362
1363 strncpy(file_name, class_name, class_name_len);
1364 strncpy(&file_name[class_name_len], class_suffix, sizeof(class_suffix));
1365
1366 return file_name;
1367 }
1368
1369 ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
1370 const GrowableArray<ModuleClassPathList*>* const module_list) {
1371 int num_of_entries = module_list->length();
1372 const Symbol* class_module_name = mod_entry->name();
1373
1374 // Loop through all the modules in either the patch-module or exploded entries looking for module
1375 for (int i = 0; i < num_of_entries; i++) {
1376 ModuleClassPathList* module_cpl = module_list->at(i);
1377 Symbol* module_cpl_name = module_cpl->module_name();
1378
1379 if (module_cpl_name->fast_compare(class_module_name) == 0) {
1380 // Class' module has been located.
1381 return module_cpl->module_first_entry();
1382 }
1383 }
1384 return NULL;
1385 }
1386
1387
1388 // Search either the patch-module or exploded build entries for class.
1389 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list,
1390 const char* const class_name,
1391 const char* const file_name,
1392 TRAPS) {
1393 ClassFileStream* stream = NULL;
1394
1395 // Find the class' defining module in the boot loader's module entry table
1396 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
1397 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL;
1398
1399 // If the module system has not defined java.base yet, then
1400 // classes loaded are assumed to be defined to java.base.
1401 // When java.base is eventually defined by the module system,
1402 // all packages of classes that have been previously loaded
1403 // are verified in ModuleEntryTable::verify_javabase_packages().
1404 if (!Universe::is_module_initialized() &&
1405 !ModuleEntryTable::javabase_defined() &&
1406 mod_entry == NULL) {
1407 mod_entry = ModuleEntryTable::javabase_moduleEntry();
1408 }
1409
1410 // The module must be a named module
1411 ClassPathEntry* e = NULL;
1412 if (mod_entry != NULL && mod_entry->is_named()) {
1413 if (module_list == _exploded_entries) {
1414 // The exploded build entries can be added to at any time so a lock is
1415 // needed when searching them.
1416 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
1417 MutexLocker ml(Module_lock, THREAD);
1418 e = find_first_module_cpe(mod_entry, module_list);
1419 } else {
1420 e = find_first_module_cpe(mod_entry, module_list);
1421 }
1422 }
1423
1424 // Try to load the class from the module's ClassPathEntry list.
1425 while (e != NULL) {
1426 stream = e->open_stream(file_name, CHECK_NULL);
1427 // No context.check is required since CDS is not supported
1428 // for an exploded modules build or if --patch-module is specified.
1429 if (NULL != stream) {
1430 return stream;
1431 }
1432 e = e->next();
1433 }
1434 // If the module was located, break out even if the class was not
1435 // located successfully from that module's ClassPathEntry list.
1436 // There will not be another valid entry for that module.
1437 return NULL;
1438 }
1439
1440 // Called by the boot classloader to load classes
1441 InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1442 assert(name != NULL, "invariant");
1443 assert(THREAD->is_Java_thread(), "must be a JavaThread");
1444
1445 ResourceMark rm(THREAD);
1446 HandleMark hm(THREAD);
1447
1448 const char* const class_name = name->as_C_string();
1449
1450 EventMark m("loading class %s", class_name);
1451
1452 const char* const file_name = file_name_for_class_name(class_name,
1453 name->utf8_length());
1454 assert(file_name != NULL, "invariant");
1455
1456 ClassLoaderExt::Context context(class_name, file_name, THREAD);
1457
1458 // Lookup stream for parsing .class file
1459 ClassFileStream* stream = NULL;
1460 s2 classpath_index = 0;
1461 ClassPathEntry* e = NULL;
1462
1463 // If DumpSharedSpaces is true boot loader visibility boundaries are set to:
1464 // - [jimage] + [_first_append_entry to _last_append_entry] (all path entries).
1465 //
1466 // If search_append_only is true, boot loader visibility boundaries are
1467 // set to be _first_append_entry to the end. This includes:
1468 // [-Xbootclasspath/a]; [jvmti appended entries]
1469 //
1470 // If both DumpSharedSpaces and search_append_only are false, boot loader
1471 // visibility boundaries are set to be the --patch-module entries plus the base piece.
1472 // This would include:
1473 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1474 //
1475
1476 // Load Attempt #1: --patch-module
1477 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1478 // attempt to load the class from those locations specific to the module.
1479 // Specifications to --patch-module can contain a partial number of classes
1480 // that are part of the overall module definition. So if a particular class is not
1481 // found within its module specification, the search should continue to Load Attempt #2.
1482 // Note: The --patch-module entries are never searched if the boot loader's
1483 // visibility boundary is limited to only searching the append entries.
1484 if (_patch_mod_entries != NULL && !search_append_only) {
1485 // At CDS dump time, the --patch-module entries are ignored. That means a
1486 // class is still loaded from the runtime image even if it might
1487 // appear in the _patch_mod_entries. The runtime shared class visibility
1488 // check will determine if a shared class is visible based on the runtime
1489 // environemnt, including the runtime --patch-module setting.
1490 if (!DumpSharedSpaces) {
1491 stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL);
1492 }
1493 }
1494
1495 // Load Attempt #2: [jimage | exploded build]
1496 if (!search_append_only && (NULL == stream)) {
1497 if (has_jrt_entry()) {
1498 e = _jrt_entry;
1499 stream = _jrt_entry->open_stream(file_name, CHECK_NULL);
1500 } else {
1501 // Exploded build - attempt to locate class in its defining module's location.
1502 assert(_exploded_entries != NULL, "No exploded build entries present");
1503 stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL);
1504 }
1505 }
1506
1507 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1508 if ((search_append_only || DumpSharedSpaces) && (NULL == stream)) {
1509 // For the boot loader append path search, the starting classpath_index
1510 // for the appended piece is always 1 to account for either the
1511 // _jrt_entry or the _exploded_entries.
1512 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1513 classpath_index = 1;
1514
1515 e = _first_append_entry;
1516 while (e != NULL) {
1517 stream = e->open_stream(file_name, CHECK_NULL);
1518 if (NULL != stream) {
1519 break;
1520 }
1521 e = e->next();
1522 ++classpath_index;
1523 }
1524 }
1525
1526 if (NULL == stream) {
1527 return NULL;
1528 }
1529
1530 stream->set_verify(context.should_verify(classpath_index));
1531
1532 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1533 Handle protection_domain;
1534
1535 InstanceKlass* result = KlassFactory::create_from_stream(stream,
1536 name,
1537 loader_data,
1538 protection_domain,
1539 NULL, // host_klass
1540 NULL, // cp_patches
1541 THREAD);
1542 if (HAS_PENDING_EXCEPTION) {
1543 if (DumpSharedSpaces) {
1544 tty->print_cr("Preload Error: Failed to load %s", class_name);
1545 }
1546 return NULL;
1547 }
1548
1549 if (!add_package(file_name, classpath_index, THREAD)) {
1550 return NULL;
1551 }
1552
1553 return result;
1554 }
1555
1556 #if INCLUDE_CDS
1557 char* ClassLoader::skip_uri_protocol(char* source) {
1558 if (strncmp(source, "file:", 5) == 0) {
1559 // file: protocol path could start with file:/ or file:///
1560 // locate the char after all the forward slashes
1561 int offset = 5;
1562 while (*(source + offset) == '/') {
1563 offset++;
1564 }
1565 source += offset;
1566 // for non-windows platforms, move back one char as the path begins with a '/'
1567 #ifndef _WINDOWS
1568 source -= 1;
1569 #endif
1570 } else if (strncmp(source, "jrt:/", 5) == 0) {
1571 source += 5;
1572 }
1573 return source;
1574 }
1575
1576 // Record the shared classpath index and loader type for classes loaded
1577 // by the builtin loaders at dump time.
1578 void ClassLoader::record_result(InstanceKlass* ik, const ClassFileStream* stream) {
1579 assert(DumpSharedSpaces, "sanity");
1580 assert(stream != NULL, "sanity");
1581
1582 if (ik->is_anonymous()) {
1583 // We do not archive anonymous classes.
1584 return;
1585 }
1586
1587 oop loader = ik->class_loader();
1588 char* src = (char*)stream->source();
1589 if (src == NULL) {
1590 if (loader == NULL) {
1591 // JFR classes
1592 ik->set_shared_classpath_index(0);
1593 ik->set_class_loader_type(ClassLoader::BOOT_LOADER);
1594 }
1595 return;
1596 }
1597
1598 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build");
1599
1600 ResourceMark rm;
1601 Thread* THREAD = Thread::current();
1602 int classpath_index = -1;
1603 PackageEntry* pkg_entry = ik->package();
1604
1605 if (FileMapInfo::get_number_of_shared_paths() > 0) {
1606 char* canonical_path = NEW_RESOURCE_ARRAY(char, JVM_MAXPATHLEN);
1607
1608 // save the path from the file: protocol or the module name from the jrt: protocol
1609 // if no protocol prefix is found, path is the same as stream->source()
1610 char* path = skip_uri_protocol(src);
1611 for (int i = 0; i < FileMapInfo::get_number_of_shared_paths(); i++) {
1612 SharedClassPathEntry* ent = FileMapInfo::shared_path(i);
1613 if (get_canonical_path(ent->name(), canonical_path, JVM_MAXPATHLEN)) {
1614 // If the path (from the class stream source) is the same as the shared
1615 // class or module path, then we have a match.
1616 if (strcmp(canonical_path, os::native_path((char*)path)) == 0) {
1617 // NULL pkg_entry and pkg_entry in an unnamed module implies the class
1618 // is from the -cp. Ensure the index is within the -cp range before assigning
1619 // to the classpath_index.
1620 if ((pkg_entry == NULL) || (pkg_entry->in_unnamed_module())) {
1621 if (SystemDictionary::is_system_class_loader(loader) &&
1622 (i >= ClassLoaderExt::app_class_paths_start_index()) &&
1623 (i < ClassLoaderExt::app_module_paths_start_index())) {
1624 classpath_index = i;
1625 break;
1626 } else {
1627 if ((i >= 1) &&
1628 (i < ClassLoaderExt::app_module_paths_start_index())) {
1629 classpath_index = i;
1630 break;
1631 }
1632 }
1633 } else {
1634 // non-NULL pkg_entry and is a named module implies the class is from the
1635 // --module-path. Ensure the index is within the --module-path range before
1636 // assigning to the classpath_index.
1637 if ((pkg_entry != NULL) && !(pkg_entry->in_unnamed_module()) && (i > 0)) {
1638 if (i >= ClassLoaderExt::app_module_paths_start_index() &&
1639 i < FileMapInfo::get_number_of_shared_paths()) {
1640 classpath_index = i;
1641 break;
1642 }
1643 }
1644 }
1645 }
1646 // for index 0 and the stream->source() is the modules image or has the jrt: protocol.
1647 // The class must be from the runtime modules image.
1648 if (i == 0 && (is_modules_image(src) || string_starts_with(src, "jrt:"))) {
1649 classpath_index = i;
1650 break;
1651 }
1652 }
1653 }
1654
1655 // No path entry found for this class. Must be a shared class loaded by the
1656 // user defined classloader.
1657 if (classpath_index < 0) {
1658 assert(ik->shared_classpath_index() < 0, "Sanity");
1659 return;
1660 }
1661 } else {
1662 assert(is_modules_image(src), "stream must be from modules image");
1663 assert(FileMapInfo::get_number_of_shared_paths() == 0, "shared path table must not have been setup");
1664 classpath_index = 0;
1665 }
1666
1667 const char* const class_name = ik->name()->as_C_string();
1668 const char* const file_name = file_name_for_class_name(class_name,
1669 ik->name()->utf8_length());
1670 assert(file_name != NULL, "invariant");
1671
1672 ClassLoaderExt::Context context(class_name, file_name, CATCH);
1673 context.record_result(ik->name(), classpath_index, ik, THREAD);
1674 }
1675 #endif // INCLUDE_CDS
1676
1677 // Initialize the class loader's access to methods in libzip. Parse and
1678 // process the boot classpath into a list ClassPathEntry objects. Once
1679 // this list has been created, it must not change order (see class PackageInfo)
1680 // it can be appended to and is by jvmti and the kernel vm.
1681
1682 void ClassLoader::initialize() {
1683 EXCEPTION_MARK;
1684
1685 if (UsePerfData) {
1686 // jvmstat performance counters
1687 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1688 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1689 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1690 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1691 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1692 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1693 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1694 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1695 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1696 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1697
1698 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1699 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1700 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1701 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1702 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1703 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1704 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1705 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1706 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1707 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1708 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1709 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1710 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1711
1712
1713 // The following performance counters are added for measuring the impact
1714 // of the bug fix of 6365597. They are mainly focused on finding out
1715 // the behavior of system & user-defined classloader lock, whether
1716 // ClassLoader.loadClass/findClass is being called synchronized or not.
1717 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1718 "systemLoaderLockContentionRate");
1719 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1720 "nonSystemLoaderLockContentionRate");
1721 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1722 "jvmFindLoadedClassNoLockCalls");
1723 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1724 "jvmDefineClassNoLockCalls");
1725
1726 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1727 "jniDefineClassNoLockCalls");
1728
1729 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1730 "unsafeDefineClassCalls");
1731
1732 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1733 "loadInstanceClassFailRate");
1734 }
1735
1736 // lookup zip library entry points
1737 load_zip_library();
1738 // lookup jimage library entry points
1739 load_jimage_library();
1740 #if INCLUDE_CDS
1741 // initialize search path
1742 if (DumpSharedSpaces) {
1743 _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
1744 }
1745 #endif
1746 setup_bootstrap_search_path();
1747 }
1748
1749 #if INCLUDE_CDS
1750 void ClassLoader::initialize_shared_path() {
1751 if (DumpSharedSpaces) {
1752 ClassLoaderExt::setup_search_paths();
1753 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1754 }
1755 }
1756
1757 void ClassLoader::initialize_module_path() {
1758 if (DumpSharedSpaces) {
1759 ClassLoaderExt::setup_module_paths();
1760 FileMapInfo::allocate_shared_path_table();
1761 }
1762 }
1763 #endif
1764
1765 jlong ClassLoader::classloader_time_ms() {
1766 return UsePerfData ?
1767 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1768 }
1769
1770 jlong ClassLoader::class_init_count() {
1771 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1772 }
1773
1774 jlong ClassLoader::class_init_time_ms() {
1775 return UsePerfData ?
1776 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1777 }
1778
1779 jlong ClassLoader::class_verify_time_ms() {
1780 return UsePerfData ?
1781 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1782 }
1783
1784 jlong ClassLoader::class_link_count() {
1785 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1786 }
1787
1788 jlong ClassLoader::class_link_time_ms() {
1789 return UsePerfData ?
1790 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1791 }
1792
1793 int ClassLoader::compute_Object_vtable() {
1794 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1795 // code to determine actual value from file
1796 // Would be value '11' if finals were in vtable
1797 int JDK_1_2_Object_vtable_size = 5;
1798 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1799 }
1800
1801
1802 void classLoader_init1() {
1803 ClassLoader::initialize();
1804 }
1805
1806 // Complete the ClassPathEntry setup for the boot loader
1807 void ClassLoader::classLoader_init2(TRAPS) {
1808 // Setup the list of module/path pairs for --patch-module processing
1809 // This must be done after the SymbolTable is created in order
1810 // to use fast_compare on module names instead of a string compare.
1811 if (Arguments::get_patch_mod_prefix() != NULL) {
1812 setup_patch_mod_entries();
1813 }
1814
1815 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
1816 // to successfully determine if java.base has been patched)
1817 create_javabase();
1818
1819 // Setup the initial java.base/path pair for the exploded build entries.
1820 // As more modules are defined during module system initialization, more
1821 // entries will be added to the exploded build array.
1822 if (!has_jrt_entry()) {
1823 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds");
1824 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds");
1825 // Set up the boot loader's _exploded_entries list. Note that this gets
1826 // done before loading any classes, by the same thread that will
1827 // subsequently do the first class load. So, no lock is needed for this.
1828 assert(_exploded_entries == NULL, "Should only get initialized once");
1829 _exploded_entries = new (ResourceObj::C_HEAP, mtModule)
1830 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true);
1831 add_to_exploded_build_list(vmSymbols::java_base(), CHECK);
1832 }
1833 }
1834
1835
1836 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1837 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1838 if (CanonicalizeEntry != NULL) {
1839 JavaThread* THREAD = JavaThread::current();
1840 JNIEnv* env = THREAD->jni_environment();
1841 ResourceMark rm(THREAD);
1842
1843 // os::native_path writes into orig_copy
1844 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1845 strcpy(orig_copy, orig);
1846 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1847 return false;
1848 }
1849 } else {
1850 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1851 strncpy(out, orig, len);
1852 out[len - 1] = '\0';
1853 }
1854 return true;
1855 }
1856
1857 void ClassLoader::create_javabase() {
1858 Thread* THREAD = Thread::current();
1859
1860 // Create java.base's module entry for the boot
1861 // class loader prior to loading j.l.Ojbect.
1862 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1863
1864 // Get module entry table
1865 ModuleEntryTable* null_cld_modules = null_cld->modules();
1866 if (null_cld_modules == NULL) {
1867 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1868 }
1869
1870 {
1871 MutexLocker ml(Module_lock, THREAD);
1872 ModuleEntry* jb_module = null_cld_modules->locked_create_entry_or_null(Handle(),
1873 false, vmSymbols::java_base(), NULL, NULL, null_cld);
1874 if (jb_module == NULL) {
1875 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
1876 }
1877 ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1878 }
1879 }
1880
1881 #ifndef PRODUCT
1882
1883 // CompileTheWorld
1884 //
1885 // Iterates over all class path entries and forces compilation of all methods
1886 // in all classes found. Currently, only zip/jar archives are searched.
1887 //
1888 // The classes are loaded by the Java level bootstrap class loader, and the
1889 // initializer is called. If DelayCompilationDuringStartup is true (default),
1890 // the interpreter will run the initialization code. Note that forcing
1891 // initialization in this way could potentially lead to initialization order
1892 // problems, in which case we could just force the initialization bit to be set.
1893
1894
1895 // We need to iterate over the contents of a zip/jar file, so we replicate the
1896 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1897 // since jzfile already has a void* definition.
1898 //
1899 // Note that this is only used in debug mode.
1900 //
1901 // HotSpot integration note:
1902 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1903
1904
1905 // JDK 1.3 version
1906 typedef struct real_jzentry { /* Zip file entry */
1907 char *name; /* entry name */
1908 jint time; /* modification time */
1909 jint size; /* size of uncompressed data */
1910 jint csize; /* size of compressed data (zero if uncompressed) */
1911 jint crc; /* crc of uncompressed data */
1912 char *comment; /* optional zip file comment */
1913 jbyte *extra; /* optional extra data */
1914 jint pos; /* position of LOC header (if negative) or data */
1915 } real_jzentry;
1916
1917 typedef struct real_jzfile { /* Zip file */
1918 char *name; /* zip file name */
1919 jint refs; /* number of active references */
1920 jint fd; /* open file descriptor */
1921 void *lock; /* read lock */
1922 char *comment; /* zip file comment */
1923 char *msg; /* zip error message */
1924 void *entries; /* array of hash cells */
1925 jint total; /* total number of entries */
1926 unsigned short *table; /* Hash chain heads: indexes into entries */
1927 jint tablelen; /* number of hash eads */
1928 real_jzfile *next; /* next zip file in search list */
1929 jzentry *cache; /* we cache the most recently freed jzentry */
1930 /* Information on metadata names in META-INF directory */
1931 char **metanames; /* array of meta names (may have null names) */
1932 jint metacount; /* number of slots in metanames array */
1933 /* If there are any per-entry comments, they are in the comments array */
1934 char **comments;
1935 } real_jzfile;
1936
1937 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1938 // For now we only compile all methods in all classes in zip/jar files
1939 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1940 tty->cr();
1941 }
1942
1943 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1944 real_jzfile* zip = (real_jzfile*) _zip;
1945 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1946 tty->cr();
1947 // Iterate over all entries in zip file
1948 for (int n = 0; ; n++) {
1949 real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n));
1950 if (ze == NULL) break;
1951 ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1952 }
1953 if (HAS_PENDING_EXCEPTION) {
1954 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1955 CLEAR_PENDING_EXCEPTION;
1956 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1957 tty->print_cr("Increase class metadata storage if a limit was set");
1958 } else {
1959 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1960 }
1961 }
1962 }
1963
1964 void ClassLoader::compile_the_world() {
1965 EXCEPTION_MARK;
1966 HandleMark hm(THREAD);
1967 ResourceMark rm(THREAD);
1968
1969 assert(has_jrt_entry(), "Compile The World not supported with exploded module build");
1970
1971 // Find bootstrap loader
1972 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1973 jlong start = os::javaTimeMillis();
1974
1975 // Compile the world for the modular java runtime image
1976 _jrt_entry->compile_the_world(system_class_loader, CATCH);
1977
1978 // Iterate over all bootstrap class path appended entries
1979 ClassPathEntry* e = _first_append_entry;
1980 while (e != NULL) {
1981 assert(!e->is_modules_image(), "A modular java runtime image is present on the list of appended entries");
1982 e->compile_the_world(system_class_loader, CATCH);
1983 e = e->next();
1984 }
1985 jlong end = os::javaTimeMillis();
1986 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1987 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1988 {
1989 // Print statistics as if before normal exit:
1990 extern void print_statistics();
1991 print_statistics();
1992 }
1993 vm_exit(0);
1994 }
1995
1996 int ClassLoader::_compile_the_world_class_counter = 0;
1997 int ClassLoader::_compile_the_world_method_counter = 0;
1998 static int _codecache_sweep_counter = 0;
1999
2000 // Filter out all exceptions except OOMs
2001 static void clear_pending_exception_if_not_oom(TRAPS) {
2002 if (HAS_PENDING_EXCEPTION &&
2003 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
2004 CLEAR_PENDING_EXCEPTION;
2005 }
2006 // The CHECK at the caller will propagate the exception out
2007 }
2008
2009 /**
2010 * Returns if the given method should be compiled when doing compile-the-world.
2011 *
2012 * TODO: This should be a private method in a CompileTheWorld class.
2013 */
2014 static bool can_be_compiled(const methodHandle& m, int comp_level) {
2015 assert(CompileTheWorld, "must be");
2016
2017 // It's not valid to compile a native wrapper for MethodHandle methods
2018 // that take a MemberName appendix since the bytecode signature is not
2019 // correct.
2020 vmIntrinsics::ID iid = m->intrinsic_id();
2021 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
2022 return false;
2023 }
2024
2025 return CompilationPolicy::can_be_compiled(m, comp_level);
2026 }
2027
2028 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
2029 if (string_ends_with(name, ".class")) {
2030 // We have a .class file
2031 int len = (int)strlen(name);
2032 char buffer[2048];
2033 strncpy(buffer, name, len - 6);
2034 buffer[len-6] = 0;
2035 // If the file has a period after removing .class, it's not really a
2036 // valid class file. The class loader will check everything else.
2037 if (strchr(buffer, '.') == NULL) {
2038 _compile_the_world_class_counter++;
2039 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
2040
2041 // Construct name without extension
2042 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
2043 // Use loader to load and initialize class
2044 Klass* k = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
2045 if (k != NULL && !HAS_PENDING_EXCEPTION) {
2046 k->initialize(THREAD);
2047 }
2048 bool exception_occurred = HAS_PENDING_EXCEPTION;
2049 clear_pending_exception_if_not_oom(CHECK);
2050 if (CompileTheWorldPreloadClasses && k != NULL) {
2051 InstanceKlass* ik = InstanceKlass::cast(k);
2052 ConstantPool::preload_and_initialize_all_classes(ik->constants(), THREAD);
2053 if (HAS_PENDING_EXCEPTION) {
2054 // If something went wrong in preloading we just ignore it
2055 clear_pending_exception_if_not_oom(CHECK);
2056 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
2057 }
2058 }
2059
2060 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
2061 if (k == NULL || exception_occurred) {
2062 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
2063 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
2064 } else {
2065 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
2066 // Preload all classes to get around uncommon traps
2067 // Iterate over all methods in class
2068 int comp_level = CompilationPolicy::policy()->initial_compile_level();
2069 InstanceKlass* ik = InstanceKlass::cast(k);
2070 for (int n = 0; n < ik->methods()->length(); n++) {
2071 methodHandle m (THREAD, ik->methods()->at(n));
2072 if (can_be_compiled(m, comp_level)) {
2073 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
2074 // Give sweeper a chance to keep up with CTW
2075 VM_CTWThreshold op;
2076 VMThread::execute(&op);
2077 _codecache_sweep_counter = 0;
2078 }
2079 // Force compilation
2080 CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
2081 methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
2082 if (HAS_PENDING_EXCEPTION) {
2083 clear_pending_exception_if_not_oom(CHECK);
2084 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
2085 } else {
2086 _compile_the_world_method_counter++;
2087 }
2088 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
2089 // Clobber the first compile and force second tier compilation
2090 CompiledMethod* nm = m->code();
2091 if (nm != NULL && !m->is_method_handle_intrinsic()) {
2092 // Throw out the code so that the code cache doesn't fill up
2093 nm->make_not_entrant();
2094 }
2095 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
2096 methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
2097 if (HAS_PENDING_EXCEPTION) {
2098 clear_pending_exception_if_not_oom(CHECK);
2099 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
2100 } else {
2101 _compile_the_world_method_counter++;
2102 }
2103 }
2104 } else {
2105 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
2106 }
2107
2108 CompiledMethod* nm = m->code();
2109 if (nm != NULL && !m->is_method_handle_intrinsic()) {
2110 // Throw out the code so that the code cache doesn't fill up
2111 nm->make_not_entrant();
2112 }
2113 }
2114 }
2115 }
2116 }
2117 }
2118 }
2119
2120 #endif //PRODUCT
2121
2122 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
2123 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
2124 void PerfClassTraceTime::initialize() {
2125 if (!UsePerfData) return;
2126
2127 if (_eventp != NULL) {
2128 // increment the event counter
2129 _eventp->inc();
2130 }
2131
2132 // stop the current active thread-local timer to measure inclusive time
2133 _prev_active_event = -1;
2134 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
2135 if (_timers[i].is_active()) {
2136 assert(_prev_active_event == -1, "should have only one active timer");
2137 _prev_active_event = i;
2138 _timers[i].stop();
2139 }
2140 }
2141
2142 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
2143 // start the inclusive timer if not recursively called
2144 _t.start();
2145 }
2146
2147 // start thread-local timer of the given event type
2148 if (!_timers[_event_type].is_active()) {
2149 _timers[_event_type].start();
2150 }
2151 }
2152
2153 PerfClassTraceTime::~PerfClassTraceTime() {
2154 if (!UsePerfData) return;
2155
2156 // stop the thread-local timer as the event completes
2157 // and resume the thread-local timer of the event next on the stack
2158 _timers[_event_type].stop();
2159 jlong selftime = _timers[_event_type].ticks();
2160
2161 if (_prev_active_event >= 0) {
2162 _timers[_prev_active_event].start();
2163 }
2164
2165 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
2166
2167 // increment the counters only on the leaf call
2168 _t.stop();
2169 _timep->inc(_t.ticks());
2170 if (_selftimep != NULL) {
2171 _selftimep->inc(selftime);
2172 }
2173 // add all class loading related event selftime to the accumulated time counter
2174 ClassLoader::perf_accumulated_time()->inc(selftime);
2175
2176 // reset the timer
2177 _timers[_event_type].reset();
2178 }