1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classFileStream.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderData.inline.hpp"
29 #include "classfile/classLoaderExt.hpp"
30 #include "classfile/javaClasses.hpp"
31 #include "classfile/jimage.hpp"
32 #include "classfile/moduleEntry.hpp"
33 #include "classfile/modules.hpp"
34 #include "classfile/packageEntry.hpp"
35 #include "classfile/klassFactory.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/vmSymbols.hpp"
38 #include "compiler/compileBroker.hpp"
39 #include "gc/shared/collectedHeap.inline.hpp"
40 #include "gc/shared/generation.hpp"
41 #include "interpreter/bytecodeStream.hpp"
42 #include "interpreter/oopMapCache.hpp"
43 #include "logging/logTag.hpp"
44 #include "memory/allocation.inline.hpp"
45 #include "memory/filemap.hpp"
46 #include "memory/oopFactory.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.inline.hpp"
49 #include "oops/instanceKlass.hpp"
50 #include "oops/instanceRefKlass.hpp"
51 #include "oops/objArrayOop.inline.hpp"
52 #include "oops/oop.inline.hpp"
53 #include "oops/symbol.hpp"
54 #include "prims/jvm_misc.hpp"
55 #include "runtime/arguments.hpp"
56 #include "runtime/compilationPolicy.hpp"
57 #include "runtime/fprofiler.hpp"
58 #include "runtime/handles.hpp"
59 #include "runtime/handles.inline.hpp"
60 #include "runtime/init.hpp"
61 #include "runtime/interfaceSupport.hpp"
62 #include "runtime/java.hpp"
63 #include "runtime/javaCalls.hpp"
64 #include "runtime/os.hpp"
65 #include "runtime/threadCritical.hpp"
66 #include "runtime/timer.hpp"
67 #include "runtime/vm_version.hpp"
68 #include "services/management.hpp"
69 #include "services/threadService.hpp"
70 #include "utilities/events.hpp"
71 #include "utilities/hashtable.inline.hpp"
72 #include "utilities/macros.hpp"
73 #if INCLUDE_CDS
74 #include "classfile/sharedClassUtil.hpp"
75 #include "classfile/sharedPathsMiscInfo.hpp"
76 #endif
77
78 // Entry points in zip.dll for loading zip/jar file entries
79
80 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg);
81 typedef void (JNICALL *ZipClose_t)(jzfile *zip);
82 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
83 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
84 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n);
85 typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg);
86 typedef jint (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len);
87 typedef void (JNICALL *FreeEntry_t)(jzfile *zip, jzentry *entry);
88
89 static ZipOpen_t ZipOpen = NULL;
90 static ZipClose_t ZipClose = NULL;
91 static FindEntry_t FindEntry = NULL;
92 static ReadEntry_t ReadEntry = NULL;
93 static GetNextEntry_t GetNextEntry = NULL;
94 static canonicalize_fn_t CanonicalizeEntry = NULL;
95 static ZipInflateFully_t ZipInflateFully = NULL;
96 static Crc32_t Crc32 = NULL;
97 static FreeEntry_t FreeEntry = NULL;
98
99 // Entry points for jimage.dll for loading jimage file entries
100
101 static JImageOpen_t JImageOpen = NULL;
102 static JImageClose_t JImageClose = NULL;
103 static JImagePackageToModule_t JImagePackageToModule = NULL;
104 static JImageFindResource_t JImageFindResource = NULL;
105 static JImageGetResource_t JImageGetResource = NULL;
106 static JImageResourceIterator_t JImageResourceIterator = NULL;
107 static JImage_ResourcePath_t JImageResourcePath = NULL;
108
109 // Globals
110
111 PerfCounter* ClassLoader::_perf_accumulated_time = NULL;
112 PerfCounter* ClassLoader::_perf_classes_inited = NULL;
113 PerfCounter* ClassLoader::_perf_class_init_time = NULL;
114 PerfCounter* ClassLoader::_perf_class_init_selftime = NULL;
115 PerfCounter* ClassLoader::_perf_classes_verified = NULL;
116 PerfCounter* ClassLoader::_perf_class_verify_time = NULL;
117 PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL;
118 PerfCounter* ClassLoader::_perf_classes_linked = NULL;
119 PerfCounter* ClassLoader::_perf_class_link_time = NULL;
120 PerfCounter* ClassLoader::_perf_class_link_selftime = NULL;
121 PerfCounter* ClassLoader::_perf_class_parse_time = NULL;
122 PerfCounter* ClassLoader::_perf_class_parse_selftime = NULL;
123 PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL;
124 PerfCounter* ClassLoader::_perf_shared_classload_time = NULL;
125 PerfCounter* ClassLoader::_perf_sys_classload_time = NULL;
126 PerfCounter* ClassLoader::_perf_app_classload_time = NULL;
127 PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL;
128 PerfCounter* ClassLoader::_perf_app_classload_count = NULL;
129 PerfCounter* ClassLoader::_perf_define_appclasses = NULL;
130 PerfCounter* ClassLoader::_perf_define_appclass_time = NULL;
131 PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL;
132 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL;
133 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL;
134 PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
135 PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
136 PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
137 PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
138 PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
139 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL;
140 PerfCounter* ClassLoader::_isUnsyncloadClass = NULL;
141 PerfCounter* ClassLoader::_load_instance_class_failCounter = NULL;
142
143 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = NULL;
144 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = NULL;
145 ClassPathEntry* ClassLoader::_jrt_entry = NULL;
146 ClassPathEntry* ClassLoader::_first_append_entry = NULL;
147 ClassPathEntry* ClassLoader::_last_append_entry = NULL;
148 int ClassLoader::_num_entries = 0;
149 #if INCLUDE_CDS
150 GrowableArray<char*>* ClassLoader::_boot_modules_array = NULL;
151 GrowableArray<char*>* ClassLoader::_platform_modules_array = NULL;
152 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL;
153 int ClassLoader::_num_patch_mod_prefixes = 0;
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 static PackageEntry* 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 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
266 if (jio_snprintf(path, JVM_MAXPATHLEN, "%s%s%s", _dir, os::file_separator(), name) == -1) {
267 FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN);
268 return NULL;
269 }
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, JVM_MAXPATHLEN);
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, JVM_MAXPATHLEN);
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 bool ClassPathZipEntry::stream_exists(const char* name) {
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, filesize;
329 jzentry* entry = (*FindEntry)(_zip, name, &filesize, &name_len);
330 if (entry != NULL) {
331 (*FreeEntry)(_zip, entry);
332 return true;
333 }
334 return false;
335 }
336
337 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
338 // enable call to C land
339 JavaThread* thread = JavaThread::current();
340 ThreadToNativeFromVM ttn(thread);
341 // check whether zip archive contains name
342 jint name_len;
343 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
344 if (entry == NULL) return NULL;
345 u1* buffer;
346 char name_buf[128];
347 char* filename;
348 if (name_len < 128) {
349 filename = name_buf;
350 } else {
351 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
352 }
353
354 // read contents into resource array
355 int size = (*filesize) + ((nul_terminate) ? 1 : 0);
356 buffer = NEW_RESOURCE_ARRAY(u1, size);
357 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
358
359 // return result
360 if (nul_terminate) {
361 buffer[*filesize] = 0;
362 }
363 return buffer;
364 }
365
366 #if INCLUDE_CDS
367 u1* ClassPathZipEntry::open_versioned_entry(const char* name, jint* filesize, TRAPS) {
368 u1* buffer = NULL;
369 if (DumpSharedSpaces && !_is_boot_append) {
370 // We presume default is multi-release enabled
371 const char* multi_ver = Arguments::get_property("jdk.util.jar.enableMultiRelease");
372 const char* verstr = Arguments::get_property("jdk.util.jar.version");
373 bool is_multi_ver = (multi_ver == NULL ||
374 strcmp(multi_ver, "true") == 0 ||
375 strcmp(multi_ver, "force") == 0) &&
376 is_multiple_versioned(THREAD);
377 // command line version setting
378 int version = 0;
379 const int base_version = 8; // JDK8
380 int cur_ver = JDK_Version::current().major_version();
381 if (verstr != NULL) {
382 version = atoi(verstr);
383 if (version < base_version || version > cur_ver) {
384 is_multi_ver = false;
385 // print out warning, do not use assertion here since it will continue to look
386 // for proper version.
387 warning("JDK%d is not supported in multiple version jars", version);
388 }
389 }
390
391 if (is_multi_ver) {
392 int n;
393 char* entry_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
394 if (version > 0) {
395 n = jio_snprintf(entry_name, JVM_MAXPATHLEN, "META-INF/versions/%d/%s", version, name);
396 entry_name[n] = '\0';
397 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
398 if (buffer == NULL) {
399 warning("Could not find %s in %s, try to find highest version instead", entry_name, _zip_name);
400 }
401 }
402 if (buffer == NULL) {
403 for (int i = cur_ver; i >= base_version; i--) {
404 n = jio_snprintf(entry_name, JVM_MAXPATHLEN, "META-INF/versions/%d/%s", i, name);
405 entry_name[n] = '\0';
406 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
407 if (buffer != NULL) {
408 break;
409 }
410 }
411 }
412 FREE_RESOURCE_ARRAY(char, entry_name, JVM_MAXPATHLEN);
413 }
414 }
415 return buffer;
416 }
417
418 bool ClassPathZipEntry::is_multiple_versioned(TRAPS) {
419 assert(DumpSharedSpaces, "called only at dump time");
420 if (_multi_versioned != _unknown) {
421 return (_multi_versioned == _yes) ? true : false;
422 }
423 jint size;
424 char* buffer = (char*)open_entry("META-INF/MANIFEST.MF", &size, true, CHECK_false);
425 if (buffer != NULL) {
426 char* p = buffer;
427 for ( ; *p; ++p) *p = tolower(*p);
428 if (strstr(buffer, "multi-release: true") != NULL) {
429 _multi_versioned = _yes;
430 return true;
431 }
432 }
433 _multi_versioned = _no;
434 return false;
435 }
436 #endif // INCLUDE_CDS
437
438 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
439 jint filesize;
440 u1* buffer = open_versioned_entry(name, &filesize, CHECK_NULL);
441 if (buffer == NULL) {
442 buffer = open_entry(name, &filesize, false, CHECK_NULL);
443 if (buffer == NULL) {
444 return NULL;
445 }
446 }
447 if (UsePerfData) {
448 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
449 }
450 // Resource allocated
451 return new ClassFileStream(buffer,
452 filesize,
453 _zip_name,
454 ClassFileStream::verify);
455 }
456
457 // invoke function for each entry in the zip file
458 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
459 JavaThread* thread = JavaThread::current();
460 HandleMark handle_mark(thread);
461 ThreadToNativeFromVM ttn(thread);
462 for (int n = 0; ; n++) {
463 jzentry * ze = ((*GetNextEntry)(_zip, n));
464 if (ze == NULL) break;
465 (*f)(ze->name, context);
466 }
467 }
468
469 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
470 ClassPathEntry(),
471 _jimage(jimage) {
472 guarantee(jimage != NULL, "jimage file is null");
473 guarantee(name != NULL, "jimage file name is null");
474 size_t len = strlen(name) + 1;
475 _name = NEW_C_HEAP_ARRAY(const char, len, mtClass);
476 strncpy((char *)_name, name, len);
477 }
478
479 ClassPathImageEntry::~ClassPathImageEntry() {
480 if (_name != NULL) {
481 FREE_C_HEAP_ARRAY(const char, _name);
482 _name = NULL;
483 }
484 if (_jimage != NULL) {
485 (*JImageClose)(_jimage);
486 _jimage = NULL;
487 }
488 }
489
490 // For a class in a named module, look it up in the jimage file using this syntax:
491 // /<module-name>/<package-name>/<base-class>
492 //
493 // Assumptions:
494 // 1. There are no unnamed modules in the jimage file.
495 // 2. A package is in at most one module in the jimage file.
496 //
497 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
498 jlong size;
499 JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size);
500
501 if (location == 0) {
502 ResourceMark rm;
503 const char* pkg_name = ClassLoader::package_from_name(name);
504
505 if (pkg_name != NULL) {
506 if (!Universe::is_module_initialized()) {
507 location = (*JImageFindResource)(_jimage, JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
508 #if INCLUDE_CDS
509 // CDS uses the boot class loader to load classes whose packages are in
510 // modules defined for other class loaders. So, for now, get their module
511 // names from the "modules" jimage file.
512 if (DumpSharedSpaces && location == 0) {
513 const char* module_name = (*JImagePackageToModule)(_jimage, pkg_name);
514 if (module_name != NULL) {
515 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
516 }
517 }
518 #endif
519
520 } else {
521 PackageEntry* package_entry = get_package_entry(name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
522 if (package_entry != NULL) {
523 ResourceMark rm;
524 // Get the module name
525 ModuleEntry* module = package_entry->module();
526 assert(module != NULL, "Boot classLoader package missing module");
527 assert(module->is_named(), "Boot classLoader package is in unnamed module");
528 const char* module_name = module->name()->as_C_string();
529 if (module_name != NULL) {
530 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
531 }
532 }
533 }
534 }
535 }
536 if (location != 0) {
537 if (UsePerfData) {
538 ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
539 }
540 char* data = NEW_RESOURCE_ARRAY(char, size);
541 (*JImageGetResource)(_jimage, location, data, size);
542 // Resource allocated
543 return new ClassFileStream((u1*)data,
544 (int)size,
545 _name,
546 ClassFileStream::verify);
547 }
548
549 return NULL;
550 }
551
552 #ifndef PRODUCT
553 bool ctw_visitor(JImageFile* jimage,
554 const char* module_name, const char* version, const char* package,
555 const char* name, const char* extension, void* arg) {
556 if (strcmp(extension, "class") == 0) {
557 Thread* THREAD = Thread::current();
558 ResourceMark rm(THREAD);
559 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JIMAGE_MAX_PATH);
560 jio_snprintf(path, JIMAGE_MAX_PATH - 1, "%s/%s.class", package, name);
561 ClassLoader::compile_the_world_in(path, *(Handle*)arg, THREAD);
562 return !HAS_PENDING_EXCEPTION;
563 }
564 return true;
565 }
566
567 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) {
568 tty->print_cr("CompileTheWorld : Compiling all classes in %s", name());
569 tty->cr();
570 (*JImageResourceIterator)(_jimage, (JImageResourceVisitor_t)ctw_visitor, (void *)&loader);
571 if (HAS_PENDING_EXCEPTION) {
572 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
573 CLEAR_PENDING_EXCEPTION;
574 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
575 tty->print_cr("Increase class metadata storage if a limit was set");
576 } else {
577 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
578 }
579 }
580 }
581 #endif
582
583 bool ClassPathImageEntry::is_jrt() {
584 return ClassLoader::is_jrt(name());
585 }
586
587 #if INCLUDE_CDS
588 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
589 assert(DumpSharedSpaces, "only called at dump time");
590 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure");
591 vm_exit_during_initialization(error, message);
592 }
593 #endif
594
595 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
596 _module_name = module_name;
597 _module_first_entry = NULL;
598 _module_last_entry = NULL;
599 }
600
601 ModuleClassPathList::~ModuleClassPathList() {
602 // Clean out each ClassPathEntry on list
603 ClassPathEntry* e = _module_first_entry;
604 while (e != NULL) {
605 ClassPathEntry* next_entry = e->next();
606 delete e;
607 e = next_entry;
608 }
609 }
610
611 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
612 if (new_entry != NULL) {
613 if (_module_last_entry == NULL) {
614 _module_first_entry = _module_last_entry = new_entry;
615 } else {
616 _module_last_entry->set_next(new_entry);
617 _module_last_entry = new_entry;
618 }
619 }
620 }
621
622 void ClassLoader::trace_class_path(const char* msg, const char* name) {
623 if (log_is_enabled(Info, class, path)) {
624 ResourceMark rm;
625 outputStream* out = Log(class, path)::info_stream();
626 if (msg) {
627 out->print("%s", msg);
628 }
629 if (name) {
630 if (strlen(name) < 256) {
631 out->print("%s", name);
632 } else {
633 // For very long paths, we need to print each character separately,
634 // as print_cr() has a length limit
635 while (name[0] != '\0') {
636 out->print("%c", name[0]);
637 name++;
638 }
639 }
640 }
641 out->cr();
642 }
643 }
644
645 #if INCLUDE_CDS
646 void ClassLoader::check_shared_classpath(const char *path) {
647 if (strcmp(path, "") == 0) {
648 exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
649 }
650
651 struct stat st;
652 if (os::stat(path, &st) == 0) {
653 if ((st.st_mode & S_IFMT) != S_IFREG) { // is not a regular file
654 if (!os::dir_is_empty(path)) {
655 tty->print_cr("Error: non-empty directory '%s'", path);
656 exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL);
657 }
658 }
659 }
660 }
661 #endif
662
663 void ClassLoader::setup_bootstrap_search_path() {
664 const char* sys_class_path = Arguments::get_sysclasspath();
665 const char* java_class_path = Arguments::get_appclasspath();
666 if (PrintSharedArchiveAndExit) {
667 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
668 // the same as the bootcp of the shared archive.
669 } else {
670 trace_class_path("bootstrap loader class path=", sys_class_path);
671 trace_class_path("classpath: ", java_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_search_path(sys_class_path, true);
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 #endif
697
698 // Construct the array of module/path pairs as specified to --patch-module
699 // for the boot loader to search ahead of the jimage, if the class being
700 // loaded is defined to a module that has been specified to --patch-module.
701 void ClassLoader::setup_patch_mod_entries() {
702 Thread* THREAD = Thread::current();
703 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
704 int num_of_entries = patch_mod_args->length();
705
706
707 // Set up the boot loader's _patch_mod_entries list
708 _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true);
709
710 for (int i = 0; i < num_of_entries; i++) {
711 const char* module_name = (patch_mod_args->at(i))->module_name();
712 Symbol* const module_sym = SymbolTable::lookup(module_name, (int)strlen(module_name), CHECK);
713 assert(module_sym != NULL, "Failed to obtain Symbol for module name");
714 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
715
716 char* class_path = (patch_mod_args->at(i))->path_string();
717 int len = (int)strlen(class_path);
718 int end = 0;
719 // Iterate over the module's class path entries
720 for (int start = 0; start < len; start = end) {
721 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
722 end++;
723 }
724 EXCEPTION_MARK;
725 ResourceMark rm(THREAD);
726 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
727 strncpy(path, &class_path[start], end - start);
728 path[end - start] = '\0';
729
730 struct stat st;
731 if (os::stat(path, &st) == 0) {
732 // File or directory found
733 Thread* THREAD = Thread::current();
734 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
735 // If the path specification is valid, enter it into this module's list
736 if (new_entry != NULL) {
737 module_cpl->add_to_list(new_entry);
738 }
739 }
740
741 while (class_path[end] == os::path_separator()[0]) {
742 end++;
743 }
744 }
745
746 // Record the module into the list of --patch-module entries only if
747 // valid ClassPathEntrys have been created
748 if (module_cpl->module_first_entry() != NULL) {
749 _patch_mod_entries->push(module_cpl);
750 }
751 }
752 }
753
754 void ClassLoader::setup_search_path(const char *class_path, bool bootstrap_search) {
755 int len = (int)strlen(class_path);
756 int end = 0;
757 bool set_base_piece = bootstrap_search;
758
759 // Iterate over class path entries
760 for (int start = 0; start < len; start = end) {
761 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
762 end++;
763 }
764 EXCEPTION_MARK;
765 ResourceMark rm(THREAD);
766 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
767 strncpy(path, &class_path[start], end - start);
768 path[end - start] = '\0';
769
770 // The first time through the bootstrap_search setup, it must be determined
771 // what the base or core piece of the boot loader search is. Either a java runtime
772 // image is present or this is an exploded module build situation.
773 if (set_base_piece) {
774 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
775 "Incorrect boot loader search path, no java runtime image or java.base exploded build");
776 struct stat st;
777 if (os::stat(path, &st) == 0) {
778 // Directory found
779 Thread* THREAD = Thread::current();
780 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
781
782 // Check for a jimage
783 if (Arguments::has_jimage()) {
784 assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice");
785 assert(new_entry != NULL && new_entry->is_jrt(), "No java runtime image present");
786 _jrt_entry = new_entry;
787 ++_num_entries;
788 #if INCLUDE_CDS
789 if (DumpSharedSpaces) {
790 JImageFile *jimage = _jrt_entry->jimage();
791 assert(jimage != NULL, "No java runtime image file present");
792 ClassLoader::initialize_module_loader_map(jimage);
793 }
794 #endif
795 }
796 } else {
797 // If path does not exist, exit
798 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
799 }
800 set_base_piece = false;
801 } else {
802 // Every entry on the system boot class path after the initial base piece,
803 // which is set by os::set_boot_path(), is considered an appended entry.
804 update_class_path_entry_list(path, false, bootstrap_search);
805 }
806
807 #if INCLUDE_CDS
808 if (DumpSharedSpaces) {
809 check_shared_classpath(path);
810 }
811 #endif
812 while (class_path[end] == os::path_separator()[0]) {
813 end++;
814 }
815 }
816 }
817
818 // During an exploded modules build, each module defined to the boot loader
819 // will be added to the ClassLoader::_exploded_entries array.
820 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) {
821 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
822
823 // Set up the boot loader's _exploded_entries list
824 if (_exploded_entries == NULL) {
825 _exploded_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true);
826 }
827
828 // Find the module's symbol
829 ResourceMark rm(THREAD);
830 const char *module_name = module_sym->as_C_string();
831 const char *home = Arguments::get_java_home();
832 const char file_sep = os::file_separator()[0];
833 // 10 represents the length of "modules" + 2 file separators + \0
834 size_t len = strlen(home) + strlen(module_name) + 10;
835 char *path = NEW_C_HEAP_ARRAY(char, len, mtModule);
836 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
837
838 struct stat st;
839 if (os::stat(path, &st) == 0) {
840 // Directory found
841 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
842
843 // If the path specification is valid, enter it into this module's list.
844 // There is no need to check for duplicate modules in the exploded entry list,
845 // since no two modules with the same name can be defined to the boot loader.
846 // This is checked at module definition time in Modules::define_module.
847 if (new_entry != NULL) {
848 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
849 module_cpl->add_to_list(new_entry);
850 _exploded_entries->push(module_cpl);
851 log_info(class, load)("path: %s", path);
852 }
853 }
854 FREE_C_HEAP_ARRAY(char, path);
855 }
856
857 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
858 bool throw_exception,
859 bool is_boot_append, TRAPS) {
860 JavaThread* thread = JavaThread::current();
861 ClassPathEntry* new_entry = NULL;
862 if ((st->st_mode & S_IFMT) == S_IFREG) {
863 ResourceMark rm(thread);
864 // Regular file, should be a zip or jimage file
865 // Canonicalized filename
866 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
867 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
868 // This matches the classic VM
869 if (throw_exception) {
870 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
871 } else {
872 return NULL;
873 }
874 }
875 jint error;
876 JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
877 if (jimage != NULL) {
878 new_entry = new ClassPathImageEntry(jimage, canonical_path);
879 } else {
880 char* error_msg = NULL;
881 jzfile* zip;
882 {
883 // enable call to C land
884 ThreadToNativeFromVM ttn(thread);
885 HandleMark hm(thread);
886 zip = (*ZipOpen)(canonical_path, &error_msg);
887 }
888 if (zip != NULL && error_msg == NULL) {
889 new_entry = new ClassPathZipEntry(zip, path, is_boot_append);
890 } else {
891 char *msg;
892 if (error_msg == NULL) {
893 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ;
894 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
895 } else {
896 int len = (int)(strlen(path) + strlen(error_msg) + 128);
897 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ;
898 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
899 }
900 // Don't complain about bad jar files added via -Xbootclasspath/a:.
901 if (throw_exception && is_init_completed()) {
902 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
903 } else {
904 return NULL;
905 }
906 }
907 }
908 log_info(class, path)("opened: %s", path);
909 log_info(class, load)("opened: %s", path);
910 } else {
911 // Directory
912 new_entry = new ClassPathDirEntry(path);
913 log_info(class, load)("path: %s", path);
914 }
915 return new_entry;
916 }
917
918
919 // Create a class path zip entry for a given path (return NULL if not found
920 // or zip/JAR file cannot be opened)
921 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
922 // check for a regular file
923 struct stat st;
924 if (os::stat(path, &st) == 0) {
925 if ((st.st_mode & S_IFMT) == S_IFREG) {
926 char canonical_path[JVM_MAXPATHLEN];
927 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
928 char* error_msg = NULL;
929 jzfile* zip;
930 {
931 // enable call to C land
932 JavaThread* thread = JavaThread::current();
933 ThreadToNativeFromVM ttn(thread);
934 HandleMark hm(thread);
935 zip = (*ZipOpen)(canonical_path, &error_msg);
936 }
937 if (zip != NULL && error_msg == NULL) {
938 // create using canonical path
939 return new ClassPathZipEntry(zip, canonical_path, is_boot_append);
940 }
941 }
942 }
943 }
944 return NULL;
945 }
946
947 // returns true if entry already on class path
948 bool ClassLoader::contains_append_entry(const char* name) {
949 ClassPathEntry* e = _first_append_entry;
950 while (e != NULL) {
951 // assume zip entries have been canonicalized
952 if (strcmp(name, e->name()) == 0) {
953 return true;
954 }
955 e = e->next();
956 }
957 return false;
958 }
959
960 void ClassLoader::add_to_list(ClassPathEntry *new_entry) {
961 if (new_entry != NULL) {
962 if (_last_append_entry == NULL) {
963 assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty");
964 _first_append_entry = _last_append_entry = new_entry;
965 } else {
966 _last_append_entry->set_next(new_entry);
967 _last_append_entry = new_entry;
968 }
969 }
970 _num_entries++;
971 }
972
973 void ClassLoader::add_to_list(const char *apath) {
974 update_class_path_entry_list((char*)apath, false, false);
975 }
976
977 // Returns true IFF the file/dir exists and the entry was successfully created.
978 bool ClassLoader::update_class_path_entry_list(const char *path,
979 bool check_for_duplicates,
980 bool is_boot_append,
981 bool throw_exception) {
982 struct stat st;
983 if (os::stat(path, &st) == 0) {
984 // File or directory found
985 ClassPathEntry* new_entry = NULL;
986 Thread* THREAD = Thread::current();
987 new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false));
988 if (new_entry == NULL) {
989 return false;
990 }
991
992 // Do not reorder the bootclasspath which would break get_system_package().
993 // Add new entry to linked list
994 if (!check_for_duplicates || !contains_append_entry(new_entry->name())) {
995 ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry);
996 }
997 return true;
998 } else {
999 #if INCLUDE_CDS
1000 if (DumpSharedSpaces) {
1001 _shared_paths_misc_info->add_nonexist_path(path);
1002 }
1003 #endif
1004 return false;
1005 }
1006 }
1007
1008 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
1009 ResourceMark rm;
1010 int num_of_entries = module_list->length();
1011 for (int i = 0; i < num_of_entries; i++) {
1012 ClassPathEntry* e;
1013 ModuleClassPathList* mpl = module_list->at(i);
1014 tty->print("%s=", mpl->module_name()->as_C_string());
1015 e = mpl->module_first_entry();
1016 while (e != NULL) {
1017 tty->print("%s", e->name());
1018 e = e->next();
1019 if (e != NULL) {
1020 tty->print("%s", os::path_separator());
1021 }
1022 }
1023 tty->print(" ;");
1024 }
1025 }
1026
1027 void ClassLoader::print_bootclasspath() {
1028 ClassPathEntry* e;
1029 tty->print("[bootclasspath= ");
1030
1031 // Print --patch-module module/path specifications first
1032 if (_patch_mod_entries != NULL) {
1033 print_module_entry_table(_patch_mod_entries);
1034 }
1035
1036 // [jimage | exploded modules build]
1037 if (has_jrt_entry()) {
1038 // Print the location of the java runtime image
1039 tty->print("%s ;", _jrt_entry->name());
1040 } else {
1041 // Print exploded module build path specifications
1042 if (_exploded_entries != NULL) {
1043 print_module_entry_table(_exploded_entries);
1044 }
1045 }
1046
1047 // appended entries
1048 e = _first_append_entry;
1049 while (e != NULL) {
1050 tty->print("%s ;", e->name());
1051 e = e->next();
1052 }
1053 tty->print_cr("]");
1054 }
1055
1056 void ClassLoader::load_zip_library() {
1057 assert(ZipOpen == NULL, "should not load zip library twice");
1058 // First make sure native library is loaded
1059 os::native_java_library();
1060 // Load zip library
1061 char path[JVM_MAXPATHLEN];
1062 char ebuf[1024];
1063 void* handle = NULL;
1064 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
1065 handle = os::dll_load(path, ebuf, sizeof ebuf);
1066 }
1067 if (handle == NULL) {
1068 vm_exit_during_initialization("Unable to load ZIP library", path);
1069 }
1070 // Lookup zip entry points
1071 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
1072 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
1073 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
1074 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
1075 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
1076 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
1077 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
1078 FreeEntry = CAST_TO_FN_PTR(FreeEntry_t, os::dll_lookup(handle, "ZIP_FreeEntry"));
1079
1080 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
1081 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
1082 GetNextEntry == NULL || Crc32 == NULL) {
1083 vm_exit_during_initialization("Corrupted ZIP library", path);
1084 }
1085
1086 if (ZipInflateFully == NULL) {
1087 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
1088 }
1089
1090 // Lookup canonicalize entry in libjava.dll
1091 void *javalib_handle = os::native_java_library();
1092 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
1093 // This lookup only works on 1.3. Do not check for non-null here
1094 }
1095
1096 void ClassLoader::load_jimage_library() {
1097 // First make sure native library is loaded
1098 os::native_java_library();
1099 // Load jimage library
1100 char path[JVM_MAXPATHLEN];
1101 char ebuf[1024];
1102 void* handle = NULL;
1103 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
1104 handle = os::dll_load(path, ebuf, sizeof ebuf);
1105 }
1106 if (handle == NULL) {
1107 vm_exit_during_initialization("Unable to load jimage library", path);
1108 }
1109
1110 // Lookup jimage entry points
1111 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open"));
1112 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found");
1113 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close"));
1114 guarantee(JImageClose != NULL, "function JIMAGE_Close not found");
1115 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule"));
1116 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found");
1117 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource"));
1118 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found");
1119 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource"));
1120 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found");
1121 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator"));
1122 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found");
1123 JImageResourcePath = CAST_TO_FN_PTR(JImage_ResourcePath_t, os::dll_lookup(handle, "JIMAGE_ResourcePath"));
1124 guarantee(JImageResourcePath != NULL, "function JIMAGE_ResourcePath not found");
1125 }
1126
1127 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
1128 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
1129 }
1130
1131 int ClassLoader::crc32(int crc, const char* buf, int len) {
1132 assert(Crc32 != NULL, "ZIP_CRC32 is not found");
1133 return (*Crc32)(crc, (const jbyte*)buf, len);
1134 }
1135
1136 #if INCLUDE_CDS
1137 void ClassLoader::initialize_module_loader_map(JImageFile* jimage) {
1138 if (!DumpSharedSpaces) {
1139 return; // only needed for CDS dump time
1140 }
1141
1142 ResourceMark rm;
1143 jlong size;
1144 JImageLocationRef location = (*JImageFindResource)(jimage, JAVA_BASE_NAME, get_jimage_version_string(), MODULE_LOADER_MAP, &size);
1145 if (location == 0) {
1146 vm_exit_during_initialization(
1147 "Cannot find ModuleLoaderMap location from modules jimage.", NULL);
1148 }
1149 char* buffer = NEW_RESOURCE_ARRAY(char, size + 1);
1150 buffer[size] = '\0';
1151 jlong read = (*JImageGetResource)(jimage, location, buffer, size);
1152 if (read != size) {
1153 vm_exit_during_initialization(
1154 "Cannot find ModuleLoaderMap resource from modules jimage.", NULL);
1155 }
1156 char* char_buf = (char*)buffer;
1157 int buflen = (int)strlen(char_buf);
1158 char* begin_ptr = char_buf;
1159 char* end_ptr = strchr(begin_ptr, '\n');
1160 bool process_boot_modules = false;
1161 _boot_modules_array = new (ResourceObj::C_HEAP, mtModule)
1162 GrowableArray<char*>(INITIAL_BOOT_MODULES_ARRAY_SIZE, true);
1163 _platform_modules_array = new (ResourceObj::C_HEAP, mtModule)
1164 GrowableArray<char*>(INITIAL_PLATFORM_MODULES_ARRAY_SIZE, true);
1165 while (end_ptr != NULL && (end_ptr - char_buf) < buflen) {
1166 // Allocate a buffer from the C heap to be appended to the _boot_modules_array
1167 // or the _platform_modules_array.
1168 char* temp_name = NEW_C_HEAP_ARRAY(char, (size_t)(end_ptr - begin_ptr + 1), mtInternal);
1169 strncpy(temp_name, begin_ptr, end_ptr - begin_ptr);
1170 temp_name[end_ptr - begin_ptr] = '\0';
1171 if (strncmp(temp_name, "BOOT", 4) == 0) {
1172 process_boot_modules = true;
1173 FREE_C_HEAP_ARRAY(char, temp_name);
1174 } else if (strncmp(temp_name, "PLATFORM", 8) == 0) {
1175 process_boot_modules = false;
1176 FREE_C_HEAP_ARRAY(char, temp_name);
1177 } else {
1178 // module name
1179 if (process_boot_modules) {
1180 _boot_modules_array->append(temp_name);
1181 } else {
1182 _platform_modules_array->append(temp_name);
1183 }
1184 }
1185 begin_ptr = ++end_ptr;
1186 end_ptr = strchr(begin_ptr, '\n');
1187 }
1188 }
1189 #endif
1190
1191 // Function add_package extracts the package from the fully qualified class name
1192 // and checks if the package is in the boot loader's package entry table. If so,
1193 // then it sets the classpath_index in the package entry record.
1194 //
1195 // The classpath_index field is used to find the entry on the boot loader class
1196 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
1197 // in an unnamed module. It is also used to indicate (for all packages whose
1198 // classes are loaded by the boot loader) that at least one of the package's
1199 // classes has been loaded.
1200 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) {
1201 assert(fullq_class_name != NULL, "just checking");
1202
1203 // Get package name from fully qualified class name.
1204 ResourceMark rm;
1205 const char *cp = package_from_name(fullq_class_name);
1206 if (cp != NULL) {
1207 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();
1208 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp, CHECK_false);
1209 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol);
1210 if (pkg_entry != NULL) {
1211 assert(classpath_index != -1, "Unexpected classpath_index");
1212 pkg_entry->set_classpath_index(classpath_index);
1213 } else {
1214 return false;
1215 }
1216 }
1217 return true;
1218 }
1219
1220 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1221 // Look up the name in the boot loader's package entry table.
1222 if (name != NULL) {
1223 TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL);
1224 // Look for the package entry in the boot loader's package entry table.
1225 PackageEntry* package =
1226 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1227
1228 // Return NULL if package does not exist or if no classes in that package
1229 // have been loaded.
1230 if (package != NULL && package->has_loaded_class()) {
1231 ModuleEntry* module = package->module();
1232 if (module->location() != NULL) {
1233 ResourceMark rm(THREAD);
1234 Handle ml = java_lang_String::create_from_str(
1235 module->location()->as_C_string(), THREAD);
1236 return ml();
1237 }
1238 // Return entry on boot loader class path.
1239 Handle cph = java_lang_String::create_from_str(
1240 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1241 return cph();
1242 }
1243 }
1244 return NULL;
1245 }
1246
1247 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1248 ResourceMark rm(THREAD);
1249 // List of pointers to PackageEntrys that have loaded classes.
1250 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
1251 {
1252 MutexLocker ml(Module_lock, THREAD);
1253
1254 PackageEntryTable* pe_table =
1255 ClassLoaderData::the_null_class_loader_data()->packages();
1256
1257 // Collect the packages that have at least one loaded class.
1258 for (int x = 0; x < pe_table->table_size(); x++) {
1259 for (PackageEntry* package_entry = pe_table->bucket(x);
1260 package_entry != NULL;
1261 package_entry = package_entry->next()) {
1262 if (package_entry->has_loaded_class()) {
1263 loaded_class_pkgs->append(package_entry);
1264 }
1265 }
1266 }
1267 }
1268
1269
1270 // Allocate objArray and fill with java.lang.String
1271 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1272 loaded_class_pkgs->length(), CHECK_NULL);
1273 objArrayHandle result(THREAD, r);
1274 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1275 PackageEntry* package_entry = loaded_class_pkgs->at(x);
1276 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1277 result->obj_at_put(x, str());
1278 }
1279 return result();
1280 }
1281
1282 #if INCLUDE_CDS
1283 s2 ClassLoader::module_to_classloader(const char* module_name) {
1284
1285 assert(DumpSharedSpaces, "dump time only");
1286 assert(_boot_modules_array != NULL, "_boot_modules_array is NULL");
1287 assert(_platform_modules_array != NULL, "_platform_modules_array is NULL");
1288
1289 int array_size = _boot_modules_array->length();
1290 for (int i = 0; i < array_size; i++) {
1291 if (strcmp(module_name, _boot_modules_array->at(i)) == 0) {
1292 return BOOT_LOADER;
1293 }
1294 }
1295
1296 array_size = _platform_modules_array->length();
1297 for (int i = 0; i < array_size; i++) {
1298 if (strcmp(module_name, _platform_modules_array->at(i)) == 0) {
1299 return PLATFORM_LOADER;
1300 }
1301 }
1302
1303 return APP_LOADER;
1304 }
1305
1306 s2 ClassLoader::classloader_type(Symbol* class_name, ClassPathEntry* e, int classpath_index, TRAPS) {
1307 assert(DumpSharedSpaces, "Only used for CDS dump time");
1308
1309 // obtain the classloader type based on the class name.
1310 // First obtain the package name based on the class name. Then obtain
1311 // the classloader type based on the package name from the jimage using
1312 // a jimage API. If the classloader type cannot be found from the
1313 // jimage, it is determined by the class path entry.
1314 jshort loader_type = ClassLoader::APP_LOADER;
1315 if (e->is_jrt()) {
1316 ResourceMark rm;
1317 TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK_0);
1318 if (pkg_name != NULL) {
1319 const char* pkg_name_C_string = (const char*)(pkg_name->as_C_string());
1320 ClassPathImageEntry* cpie = (ClassPathImageEntry*)e;
1321 JImageFile* jimage = cpie->jimage();
1322 char* module_name = (char*)(*JImagePackageToModule)(jimage, pkg_name_C_string);
1323 if (module_name != NULL) {
1324 loader_type = ClassLoader::module_to_classloader(module_name);
1325 }
1326 }
1327 } else if (ClassLoaderExt::is_boot_classpath(classpath_index)) {
1328 loader_type = ClassLoader::BOOT_LOADER;
1329 }
1330 return loader_type;
1331 }
1332 #endif
1333
1334 // caller needs ResourceMark
1335 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1336 int class_name_len) {
1337 assert(class_name != NULL, "invariant");
1338 assert((int)strlen(class_name) == class_name_len, "invariant");
1339
1340 static const char class_suffix[] = ".class";
1341
1342 char* const file_name = NEW_RESOURCE_ARRAY(char,
1343 class_name_len +
1344 sizeof(class_suffix)); // includes term NULL
1345
1346 strncpy(file_name, class_name, class_name_len);
1347 strncpy(&file_name[class_name_len], class_suffix, sizeof(class_suffix));
1348
1349 return file_name;
1350 }
1351
1352 // Search either the patch-module or exploded build entries for class
1353 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list,
1354 const char* const class_name, const char* const file_name, TRAPS) {
1355 ClassFileStream* stream = NULL;
1356
1357 // Find the class' defining module in the boot loader's module entry table
1358 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
1359 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL;
1360
1361 // If the module system has not defined java.base yet, then
1362 // classes loaded are assumed to be defined to java.base.
1363 // When java.base is eventually defined by the module system,
1364 // all packages of classes that have been previously loaded
1365 // are verified in ModuleEntryTable::verify_javabase_packages().
1366 if (!Universe::is_module_initialized() &&
1367 !ModuleEntryTable::javabase_defined() &&
1368 mod_entry == NULL) {
1369 mod_entry = ModuleEntryTable::javabase_moduleEntry();
1370 }
1371
1372 // The module must be a named module
1373 if (mod_entry != NULL && mod_entry->is_named()) {
1374 int num_of_entries = module_list->length();
1375 const Symbol* class_module_name = mod_entry->name();
1376
1377 // Loop through all the modules in either the patch-module or exploded entries looking for module
1378 for (int i = 0; i < num_of_entries; i++) {
1379 ModuleClassPathList* module_cpl = module_list->at(i);
1380 Symbol* module_cpl_name = module_cpl->module_name();
1381
1382 if (module_cpl_name->fast_compare(class_module_name) == 0) {
1383 // Class' module has been located, attempt to load
1384 // the class from the module's ClassPathEntry list.
1385 ClassPathEntry* e = module_cpl->module_first_entry();
1386 while (e != NULL) {
1387 stream = e->open_stream(file_name, CHECK_NULL);
1388 // No context.check is required since CDS is not supported
1389 // for an exploded modules build or if --patch-module is specified.
1390 if (NULL != stream) {
1391 return stream;
1392 }
1393 e = e->next();
1394 }
1395 // If the module was located, break out even if the class was not
1396 // located successfully from that module's ClassPathEntry list.
1397 // There will not be another valid entry for that module.
1398 return NULL;
1399 }
1400 }
1401 }
1402
1403 return NULL;
1404 }
1405
1406 #if INCLUDE_CDS
1407 // The following function is only used during CDS dump time.
1408 // It checks if a class can be found in the jar entries of the _patch_mod_entries.
1409 // It does not support non-jar entries.
1410 bool ClassLoader::is_in_patch_module(const char* const file_name) {
1411 assert(DumpSharedSpaces, "dump time only");
1412 if (_patch_mod_entries == NULL) {
1413 return false;
1414 }
1415
1416 int num_of_entries = _patch_mod_entries->length();
1417 char* class_module_name = NULL;
1418 ResourceMark rm;
1419 const char *pkg_name = package_from_name(file_name);
1420 // Using the jimage to obtain the class' module name.
1421 // The ModuleEntryTable cannot be used at this point during dump time
1422 // because the module system hasn't been initialized yet.
1423 if (pkg_name != NULL) {
1424 JImageFile *jimage = _jrt_entry->jimage();
1425 class_module_name = (char*)(*JImagePackageToModule)(jimage, pkg_name);
1426 }
1427
1428 if (class_module_name == NULL) {
1429 return false;
1430 }
1431
1432 // Loop through all the patch module entries looking for module
1433 for (int i = 0; i < num_of_entries; i++) {
1434 ModuleClassPathList* module_cpl = _patch_mod_entries->at(i);
1435 Symbol* module_cpl_name = module_cpl->module_name();
1436
1437 if (strcmp(module_cpl_name->as_C_string(), class_module_name) == 0) {
1438 // Class' module has been located, attempt to locate
1439 // the class from the module's ClassPathEntry list.
1440 ClassPathEntry* e = module_cpl->module_first_entry();
1441 while (e != NULL) {
1442 if (e->is_jar_file()) {
1443 if (e->stream_exists(file_name)) {
1444 return true;
1445 } else {
1446 e = e->next();
1447 }
1448 }
1449 }
1450 }
1451 }
1452
1453 return false;
1454 }
1455 #endif // INCLUDE_CDS
1456
1457 instanceKlassHandle ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1458 assert(name != NULL, "invariant");
1459 assert(THREAD->is_Java_thread(), "must be a JavaThread");
1460
1461 ResourceMark rm(THREAD);
1462 HandleMark hm(THREAD);
1463
1464 const char* const class_name = name->as_C_string();
1465
1466 EventMark m("loading class %s", class_name);
1467 ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion);
1468
1469 const char* const file_name = file_name_for_class_name(class_name,
1470 name->utf8_length());
1471 assert(file_name != NULL, "invariant");
1472
1473 ClassLoaderExt::Context context(class_name, file_name, THREAD);
1474
1475 // Lookup stream for parsing .class file
1476 ClassFileStream* stream = NULL;
1477 s2 classpath_index = 0;
1478 ClassPathEntry* e = NULL;
1479
1480 // If DumpSharedSpaces is true boot loader visibility boundaries are set to:
1481 // - [jimage] + [_first_append_entry to _last_append_entry] (all path entries).
1482 // If a class is found in the --patch-module entries, the class will not be included in the
1483 // CDS archive. Also, CDS is not supported if exploded module builds are used.
1484 //
1485 // If search_append_only is true, boot loader visibility boundaries are
1486 // set to be _first_append_entry to the end. This includes:
1487 // [-Xbootclasspath/a]; [jvmti appended entries]
1488 //
1489 // If both DumpSharedSpaces and search_append_only are false, boot loader
1490 // visibility boundaries are set to be the --patch-module entries plus the base piece.
1491 // This would include:
1492 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1493 //
1494 // DumpSharedSpaces and search_append_only are mutually exclusive and cannot
1495 // be true at the same time.
1496 assert(!(DumpSharedSpaces && search_append_only), "DumpSharedSpaces and search_append_only are both true");
1497
1498 // Load Attempt #1: --patch-module
1499 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1500 // attempt to load the class from those locations specific to the module.
1501 // Specifications to --patch-module can contain a partial number of classes
1502 // that are part of the overall module definition. So if a particular class is not
1503 // found within its module specification, the search should continue to Load Attempt #2.
1504 // Note: The --patch-module entries are never searched if the boot loader's
1505 // visibility boundary is limited to only searching the append entries.
1506 if (_patch_mod_entries != NULL && !search_append_only) {
1507 if (!DumpSharedSpaces) {
1508 stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL);
1509 } else {
1510 #if INCLUDE_CDS
1511 if (is_in_patch_module(file_name)) {
1512 tty->print_cr("Preload Warning: Skip archiving class %s found in --patch-module entry", class_name);
1513 return NULL;
1514 }
1515 #endif
1516 }
1517 }
1518
1519 // Load Attempt #2: [jimage | exploded build]
1520 if (!search_append_only && (NULL == stream)) {
1521 if (has_jrt_entry()) {
1522 e = _jrt_entry;
1523 stream = _jrt_entry->open_stream(file_name, CHECK_NULL);
1524 if (!context.check(stream, classpath_index)) {
1525 return NULL;
1526 }
1527 } else {
1528 // Exploded build - attempt to locate class in its defining module's location.
1529 assert(_exploded_entries != NULL, "No exploded build entries present");
1530 stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL);
1531 }
1532 }
1533
1534 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1535 if ((search_append_only || DumpSharedSpaces) && (NULL == stream)) {
1536 // For the boot loader append path search, the starting classpath_index
1537 // for the appended piece is always 1 to account for either the
1538 // _jrt_entry or the _exploded_entries.
1539 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1540 classpath_index = 1;
1541
1542 e = _first_append_entry;
1543 while (e != NULL) {
1544 stream = e->open_stream(file_name, CHECK_NULL);
1545 if (!context.check(stream, classpath_index)) {
1546 return NULL;
1547 }
1548 if (NULL != stream) {
1549 break;
1550 }
1551 e = e->next();
1552 ++classpath_index;
1553 }
1554 }
1555
1556 if (NULL == stream) {
1557 if (DumpSharedSpaces) {
1558 tty->print_cr("Preload Warning: Cannot find %s", class_name);
1559 }
1560 return NULL;
1561 }
1562
1563 stream->set_verify(context.should_verify(classpath_index));
1564
1565 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1566 Handle protection_domain;
1567
1568 instanceKlassHandle result = KlassFactory::create_from_stream(stream,
1569 name,
1570 loader_data,
1571 protection_domain,
1572 NULL, // host_klass
1573 NULL, // cp_patches
1574 THREAD);
1575 if (HAS_PENDING_EXCEPTION) {
1576 if (DumpSharedSpaces) {
1577 tty->print_cr("Preload Error: Failed to load %s", class_name);
1578 }
1579 return NULL;
1580 }
1581
1582 return context.record_result(name, e, classpath_index, result, THREAD);
1583 }
1584
1585 // Initialize the class loader's access to methods in libzip. Parse and
1586 // process the boot classpath into a list ClassPathEntry objects. Once
1587 // this list has been created, it must not change order (see class PackageInfo)
1588 // it can be appended to and is by jvmti and the kernel vm.
1589
1590 void ClassLoader::initialize() {
1591 EXCEPTION_MARK;
1592
1593 if (UsePerfData) {
1594 // jvmstat performance counters
1595 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1596 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1597 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1598 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1599 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1600 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1601 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1602 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1603 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1604 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1605
1606 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1607 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1608 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1609 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1610 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1611 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1612 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1613 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1614 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1615 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1616 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1617 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1618 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1619
1620
1621 // The following performance counters are added for measuring the impact
1622 // of the bug fix of 6365597. They are mainly focused on finding out
1623 // the behavior of system & user-defined classloader lock, whether
1624 // ClassLoader.loadClass/findClass is being called synchronized or not.
1625 // Also two additional counters are created to see whether 'UnsyncloadClass'
1626 // flag is being set or not and how many times load_instance_class call
1627 // fails with linkageError etc.
1628 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1629 "systemLoaderLockContentionRate");
1630 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1631 "nonSystemLoaderLockContentionRate");
1632 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1633 "jvmFindLoadedClassNoLockCalls");
1634 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1635 "jvmDefineClassNoLockCalls");
1636
1637 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1638 "jniDefineClassNoLockCalls");
1639
1640 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1641 "unsafeDefineClassCalls");
1642
1643 NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet");
1644 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1645 "loadInstanceClassFailRate");
1646
1647 // increment the isUnsyncloadClass counter if UnsyncloadClass is set.
1648 if (UnsyncloadClass) {
1649 _isUnsyncloadClass->inc();
1650 }
1651 }
1652
1653 // lookup zip library entry points
1654 load_zip_library();
1655 // lookup jimage library entry points
1656 load_jimage_library();
1657 #if INCLUDE_CDS
1658 // initialize search path
1659 if (DumpSharedSpaces) {
1660 _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
1661 }
1662 #endif
1663 setup_bootstrap_search_path();
1664 }
1665
1666 #if INCLUDE_CDS
1667 // Capture all the --patch-module entries specified during CDS dump time.
1668 // It also captures the non-existing path(s) and the required file(s) during inspecting
1669 // the entries.
1670 void ClassLoader::setup_patch_mod_path() {
1671 assert(DumpSharedSpaces, "only used with -Xshare:dump");
1672 ResourceMark rm;
1673 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
1674 if (patch_mod_args != NULL) {
1675 int num_of_entries = patch_mod_args->length();
1676 for (int i = 0; i < num_of_entries; i++) {
1677 const char* module_name = (patch_mod_args->at(i))->module_name();
1678 const char* module_path = (patch_mod_args->at(i))->path_string();
1679 int path_len = (int)strlen(module_path);
1680 int name_len = (int)strlen(module_name);
1681 int buf_len = name_len + path_len + 2; // add 2 for the '=' and NULL terminator
1682 int end = 0;
1683 char* buf = NEW_C_HEAP_ARRAY(char, buf_len, mtInternal);
1684 // Iterate over the module's class path entries
1685 for (int start = 0; start < path_len; start = end) {
1686 while (module_path[end] && module_path[end] != os::path_separator()[0]) {
1687 end++;
1688 }
1689 strncpy(buf, &module_path[start], end - start);
1690 buf[end - start] = '\0';
1691 struct stat st;
1692 if (os::stat(buf, &st) != 0) {
1693 // File not found
1694 _shared_paths_misc_info->add_nonexist_path(buf);
1695 } else {
1696 if ((st.st_mode & S_IFMT) != S_IFREG) { // is not a regular file
1697 vm_exit_during_initialization(
1698 "--patch-module requires a regular file during dumping", buf);
1699 } else {
1700 _shared_paths_misc_info->add_required_file(buf);
1701 }
1702 }
1703 while (module_path[end] == os::path_separator()[0]) {
1704 end++;
1705 }
1706 };
1707 jio_snprintf(buf, buf_len, "%s=%s", module_name, module_path);
1708 _shared_paths_misc_info->add_patch_mod_classpath((const char*)buf);
1709 _num_patch_mod_prefixes++;
1710 FREE_C_HEAP_ARRAY(char, buf);
1711 }
1712 }
1713 }
1714
1715 void ClassLoader::initialize_shared_path() {
1716 if (DumpSharedSpaces) {
1717 setup_patch_mod_path();
1718 ClassLoaderExt::setup_search_paths();
1719 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1720 }
1721 }
1722 #endif
1723
1724 jlong ClassLoader::classloader_time_ms() {
1725 return UsePerfData ?
1726 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1727 }
1728
1729 jlong ClassLoader::class_init_count() {
1730 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1731 }
1732
1733 jlong ClassLoader::class_init_time_ms() {
1734 return UsePerfData ?
1735 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1736 }
1737
1738 jlong ClassLoader::class_verify_time_ms() {
1739 return UsePerfData ?
1740 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1741 }
1742
1743 jlong ClassLoader::class_link_count() {
1744 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1745 }
1746
1747 jlong ClassLoader::class_link_time_ms() {
1748 return UsePerfData ?
1749 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1750 }
1751
1752 int ClassLoader::compute_Object_vtable() {
1753 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1754 // code to determine actual value from file
1755 // Would be value '11' if finals were in vtable
1756 int JDK_1_2_Object_vtable_size = 5;
1757 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1758 }
1759
1760
1761 void classLoader_init1() {
1762 ClassLoader::initialize();
1763 }
1764
1765 // Complete the ClassPathEntry setup for the boot loader
1766 void ClassLoader::classLoader_init2(TRAPS) {
1767 // Create the moduleEntry for java.base
1768 create_javabase();
1769
1770 // Setup the list of module/path pairs for --patch-module processing
1771 // This must be done after the SymbolTable is created in order
1772 // to use fast_compare on module names instead of a string compare.
1773 if (Arguments::get_patch_mod_prefix() != NULL) {
1774 setup_patch_mod_entries();
1775 }
1776
1777 // Setup the initial java.base/path pair for the exploded build entries.
1778 // As more modules are defined during module system initialization, more
1779 // entries will be added to the exploded build array.
1780 if (!has_jrt_entry()) {
1781 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds");
1782 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds");
1783 add_to_exploded_build_list(vmSymbols::java_base(), CHECK);
1784 }
1785 }
1786
1787
1788 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1789 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1790 if (CanonicalizeEntry != NULL) {
1791 JavaThread* THREAD = JavaThread::current();
1792 JNIEnv* env = THREAD->jni_environment();
1793 ResourceMark rm(THREAD);
1794
1795 // os::native_path writes into orig_copy
1796 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1797 strcpy(orig_copy, orig);
1798 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1799 return false;
1800 }
1801 } else {
1802 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1803 strncpy(out, orig, len);
1804 out[len - 1] = '\0';
1805 }
1806 return true;
1807 }
1808
1809 void ClassLoader::create_javabase() {
1810 Thread* THREAD = Thread::current();
1811
1812 // Create java.base's module entry for the boot
1813 // class loader prior to loading j.l.Ojbect.
1814 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1815
1816 // Get module entry table
1817 ModuleEntryTable* null_cld_modules = null_cld->modules();
1818 if (null_cld_modules == NULL) {
1819 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1820 }
1821
1822 {
1823 MutexLocker ml(Module_lock, THREAD);
1824 ModuleEntry* jb_module = null_cld_modules->locked_create_entry_or_null(Handle(NULL), vmSymbols::java_base(), NULL, NULL, null_cld);
1825 if (jb_module == NULL) {
1826 vm_exit_during_initialization("Unable to create ModuleEntry for java.base");
1827 }
1828 ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1829 }
1830 }
1831
1832 #ifndef PRODUCT
1833
1834 // CompileTheWorld
1835 //
1836 // Iterates over all class path entries and forces compilation of all methods
1837 // in all classes found. Currently, only zip/jar archives are searched.
1838 //
1839 // The classes are loaded by the Java level bootstrap class loader, and the
1840 // initializer is called. If DelayCompilationDuringStartup is true (default),
1841 // the interpreter will run the initialization code. Note that forcing
1842 // initialization in this way could potentially lead to initialization order
1843 // problems, in which case we could just force the initialization bit to be set.
1844
1845
1846 // We need to iterate over the contents of a zip/jar file, so we replicate the
1847 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1848 // since jzfile already has a void* definition.
1849 //
1850 // Note that this is only used in debug mode.
1851 //
1852 // HotSpot integration note:
1853 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1854
1855
1856 // JDK 1.3 version
1857 typedef struct real_jzentry { /* Zip file entry */
1858 char *name; /* entry name */
1859 jint time; /* modification time */
1860 jint size; /* size of uncompressed data */
1861 jint csize; /* size of compressed data (zero if uncompressed) */
1862 jint crc; /* crc of uncompressed data */
1863 char *comment; /* optional zip file comment */
1864 jbyte *extra; /* optional extra data */
1865 jint pos; /* position of LOC header (if negative) or data */
1866 } real_jzentry;
1867
1868 typedef struct real_jzfile { /* Zip file */
1869 char *name; /* zip file name */
1870 jint refs; /* number of active references */
1871 jint fd; /* open file descriptor */
1872 void *lock; /* read lock */
1873 char *comment; /* zip file comment */
1874 char *msg; /* zip error message */
1875 void *entries; /* array of hash cells */
1876 jint total; /* total number of entries */
1877 unsigned short *table; /* Hash chain heads: indexes into entries */
1878 jint tablelen; /* number of hash eads */
1879 real_jzfile *next; /* next zip file in search list */
1880 jzentry *cache; /* we cache the most recently freed jzentry */
1881 /* Information on metadata names in META-INF directory */
1882 char **metanames; /* array of meta names (may have null names) */
1883 jint metacount; /* number of slots in metanames array */
1884 /* If there are any per-entry comments, they are in the comments array */
1885 char **comments;
1886 } real_jzfile;
1887
1888 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1889 // For now we only compile all methods in all classes in zip/jar files
1890 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1891 tty->cr();
1892 }
1893
1894 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1895 real_jzfile* zip = (real_jzfile*) _zip;
1896 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1897 tty->cr();
1898 // Iterate over all entries in zip file
1899 for (int n = 0; ; n++) {
1900 real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n));
1901 if (ze == NULL) break;
1902 ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1903 }
1904 if (HAS_PENDING_EXCEPTION) {
1905 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1906 CLEAR_PENDING_EXCEPTION;
1907 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1908 tty->print_cr("Increase class metadata storage if a limit was set");
1909 } else {
1910 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1911 }
1912 }
1913 }
1914
1915 void ClassLoader::compile_the_world() {
1916 EXCEPTION_MARK;
1917 HandleMark hm(THREAD);
1918 ResourceMark rm(THREAD);
1919
1920 assert(has_jrt_entry(), "Compile The World not supported with exploded module build");
1921
1922 // Find bootstrap loader
1923 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1924 jlong start = os::javaTimeMillis();
1925
1926 // Compile the world for the modular java runtime image
1927 _jrt_entry->compile_the_world(system_class_loader, CATCH);
1928
1929 // Iterate over all bootstrap class path appended entries
1930 ClassPathEntry* e = _first_append_entry;
1931 while (e != NULL) {
1932 assert(!e->is_jrt(), "A modular java runtime image is present on the list of appended entries");
1933 e->compile_the_world(system_class_loader, CATCH);
1934 e = e->next();
1935 }
1936 jlong end = os::javaTimeMillis();
1937 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1938 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1939 {
1940 // Print statistics as if before normal exit:
1941 extern void print_statistics();
1942 print_statistics();
1943 }
1944 vm_exit(0);
1945 }
1946
1947 int ClassLoader::_compile_the_world_class_counter = 0;
1948 int ClassLoader::_compile_the_world_method_counter = 0;
1949 static int _codecache_sweep_counter = 0;
1950
1951 // Filter out all exceptions except OOMs
1952 static void clear_pending_exception_if_not_oom(TRAPS) {
1953 if (HAS_PENDING_EXCEPTION &&
1954 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1955 CLEAR_PENDING_EXCEPTION;
1956 }
1957 // The CHECK at the caller will propagate the exception out
1958 }
1959
1960 /**
1961 * Returns if the given method should be compiled when doing compile-the-world.
1962 *
1963 * TODO: This should be a private method in a CompileTheWorld class.
1964 */
1965 static bool can_be_compiled(methodHandle m, int comp_level) {
1966 assert(CompileTheWorld, "must be");
1967
1968 // It's not valid to compile a native wrapper for MethodHandle methods
1969 // that take a MemberName appendix since the bytecode signature is not
1970 // correct.
1971 vmIntrinsics::ID iid = m->intrinsic_id();
1972 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1973 return false;
1974 }
1975
1976 return CompilationPolicy::can_be_compiled(m, comp_level);
1977 }
1978
1979 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1980 if (string_ends_with(name, ".class")) {
1981 // We have a .class file
1982 int len = (int)strlen(name);
1983 char buffer[2048];
1984 strncpy(buffer, name, len - 6);
1985 buffer[len-6] = 0;
1986 // If the file has a period after removing .class, it's not really a
1987 // valid class file. The class loader will check everything else.
1988 if (strchr(buffer, '.') == NULL) {
1989 _compile_the_world_class_counter++;
1990 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
1991
1992 // Construct name without extension
1993 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
1994 // Use loader to load and initialize class
1995 Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
1996 instanceKlassHandle k (THREAD, ik);
1997 if (k.not_null() && !HAS_PENDING_EXCEPTION) {
1998 k->initialize(THREAD);
1999 }
2000 bool exception_occurred = HAS_PENDING_EXCEPTION;
2001 clear_pending_exception_if_not_oom(CHECK);
2002 if (CompileTheWorldPreloadClasses && k.not_null()) {
2003 ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD);
2004 if (HAS_PENDING_EXCEPTION) {
2005 // If something went wrong in preloading we just ignore it
2006 clear_pending_exception_if_not_oom(CHECK);
2007 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
2008 }
2009 }
2010
2011 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
2012 if (k.is_null() || exception_occurred) {
2013 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
2014 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
2015 } else {
2016 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
2017 // Preload all classes to get around uncommon traps
2018 // Iterate over all methods in class
2019 int comp_level = CompilationPolicy::policy()->initial_compile_level();
2020 for (int n = 0; n < k->methods()->length(); n++) {
2021 methodHandle m (THREAD, k->methods()->at(n));
2022 if (can_be_compiled(m, comp_level)) {
2023 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
2024 // Give sweeper a chance to keep up with CTW
2025 VM_ForceSafepoint op;
2026 VMThread::execute(&op);
2027 _codecache_sweep_counter = 0;
2028 }
2029 // Force compilation
2030 CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
2031 methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
2032 if (HAS_PENDING_EXCEPTION) {
2033 clear_pending_exception_if_not_oom(CHECK);
2034 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
2035 } else {
2036 _compile_the_world_method_counter++;
2037 }
2038 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
2039 // Clobber the first compile and force second tier compilation
2040 CompiledMethod* nm = m->code();
2041 if (nm != NULL && !m->is_method_handle_intrinsic()) {
2042 // Throw out the code so that the code cache doesn't fill up
2043 nm->make_not_entrant();
2044 }
2045 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
2046 methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
2047 if (HAS_PENDING_EXCEPTION) {
2048 clear_pending_exception_if_not_oom(CHECK);
2049 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
2050 } else {
2051 _compile_the_world_method_counter++;
2052 }
2053 }
2054 } else {
2055 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
2056 }
2057
2058 CompiledMethod* nm = m->code();
2059 if (nm != NULL && !m->is_method_handle_intrinsic()) {
2060 // Throw out the code so that the code cache doesn't fill up
2061 nm->make_not_entrant();
2062 }
2063 }
2064 }
2065 }
2066 }
2067 }
2068 }
2069
2070 #endif //PRODUCT
2071
2072 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
2073 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
2074 void PerfClassTraceTime::initialize() {
2075 if (!UsePerfData) return;
2076
2077 if (_eventp != NULL) {
2078 // increment the event counter
2079 _eventp->inc();
2080 }
2081
2082 // stop the current active thread-local timer to measure inclusive time
2083 _prev_active_event = -1;
2084 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
2085 if (_timers[i].is_active()) {
2086 assert(_prev_active_event == -1, "should have only one active timer");
2087 _prev_active_event = i;
2088 _timers[i].stop();
2089 }
2090 }
2091
2092 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
2093 // start the inclusive timer if not recursively called
2094 _t.start();
2095 }
2096
2097 // start thread-local timer of the given event type
2098 if (!_timers[_event_type].is_active()) {
2099 _timers[_event_type].start();
2100 }
2101 }
2102
2103 PerfClassTraceTime::~PerfClassTraceTime() {
2104 if (!UsePerfData) return;
2105
2106 // stop the thread-local timer as the event completes
2107 // and resume the thread-local timer of the event next on the stack
2108 _timers[_event_type].stop();
2109 jlong selftime = _timers[_event_type].ticks();
2110
2111 if (_prev_active_event >= 0) {
2112 _timers[_prev_active_event].start();
2113 }
2114
2115 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
2116
2117 // increment the counters only on the leaf call
2118 _t.stop();
2119 _timep->inc(_t.ticks());
2120 if (_selftimep != NULL) {
2121 _selftimep->inc(selftime);
2122 }
2123 // add all class loading related event selftime to the accumulated time counter
2124 ClassLoader::perf_accumulated_time()->inc(selftime);
2125
2126 // reset the timer
2127 _timers[_event_type].reset();
2128 }