1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classFileStream.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderData.inline.hpp"
29 #include "classfile/classLoaderExt.hpp"
30 #include "classfile/javaClasses.hpp"
31 #include "classfile/jimage.hpp"
32 #include "classfile/moduleEntry.hpp"
33 #include "classfile/modules.hpp"
34 #include "classfile/packageEntry.hpp"
35 #include "classfile/klassFactory.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/vmSymbols.hpp"
38 #include "compiler/compileBroker.hpp"
39 #include "gc/shared/collectedHeap.inline.hpp"
40 #include "gc/shared/generation.hpp"
41 #include "interpreter/bytecodeStream.hpp"
42 #include "interpreter/oopMapCache.hpp"
43 #include "logging/log.hpp"
44 #include "logging/logStream.hpp"
45 #include "logging/logTag.hpp"
46 #include "memory/allocation.inline.hpp"
47 #include "memory/filemap.hpp"
48 #include "memory/oopFactory.hpp"
49 #include "memory/resourceArea.hpp"
50 #include "memory/universe.inline.hpp"
51 #include "oops/instanceKlass.hpp"
52 #include "oops/instanceRefKlass.hpp"
53 #include "oops/objArrayOop.inline.hpp"
54 #include "oops/oop.inline.hpp"
55 #include "oops/symbol.hpp"
56 #include "prims/jvm.h"
57 #include "prims/jvm_misc.hpp"
58 #include "runtime/arguments.hpp"
59 #include "runtime/compilationPolicy.hpp"
60 #include "runtime/handles.hpp"
61 #include "runtime/handles.inline.hpp"
62 #include "runtime/init.hpp"
63 #include "runtime/interfaceSupport.hpp"
64 #include "runtime/java.hpp"
65 #include "runtime/javaCalls.hpp"
66 #include "runtime/os.hpp"
67 #include "runtime/threadCritical.hpp"
68 #include "runtime/timer.hpp"
69 #include "runtime/vm_version.hpp"
70 #include "services/management.hpp"
71 #include "services/threadService.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/hashtable.inline.hpp"
74 #include "utilities/macros.hpp"
75 #if INCLUDE_CDS
76 #include "classfile/sharedClassUtil.hpp"
77 #include "classfile/sharedPathsMiscInfo.hpp"
78 #endif
79
80 // Entry points in zip.dll for loading zip/jar file entries
81
82 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg);
83 typedef void (JNICALL *ZipClose_t)(jzfile *zip);
84 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
85 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
86 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n);
87 typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg);
88 typedef jint (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len);
89
90 static ZipOpen_t ZipOpen = NULL;
91 static ZipClose_t ZipClose = NULL;
92 static FindEntry_t FindEntry = NULL;
93 static ReadEntry_t ReadEntry = NULL;
94 static GetNextEntry_t GetNextEntry = NULL;
95 static canonicalize_fn_t CanonicalizeEntry = NULL;
96 static ZipInflateFully_t ZipInflateFully = NULL;
97 static Crc32_t Crc32 = NULL;
98
99 // Entry points for jimage.dll for loading jimage file entries
100
101 static JImageOpen_t JImageOpen = NULL;
102 static JImageClose_t JImageClose = NULL;
103 static JImagePackageToModule_t JImagePackageToModule = NULL;
104 static JImageFindResource_t JImageFindResource = NULL;
105 static JImageGetResource_t JImageGetResource = NULL;
106 static JImageResourceIterator_t JImageResourceIterator = NULL;
107 static JImage_ResourcePath_t JImageResourcePath = NULL;
108
109 // Globals
110
111 PerfCounter* ClassLoader::_perf_accumulated_time = NULL;
112 PerfCounter* ClassLoader::_perf_classes_inited = NULL;
113 PerfCounter* ClassLoader::_perf_class_init_time = NULL;
114 PerfCounter* ClassLoader::_perf_class_init_selftime = NULL;
115 PerfCounter* ClassLoader::_perf_classes_verified = NULL;
116 PerfCounter* ClassLoader::_perf_class_verify_time = NULL;
117 PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL;
118 PerfCounter* ClassLoader::_perf_classes_linked = NULL;
119 PerfCounter* ClassLoader::_perf_class_link_time = NULL;
120 PerfCounter* ClassLoader::_perf_class_link_selftime = NULL;
121 PerfCounter* ClassLoader::_perf_class_parse_time = NULL;
122 PerfCounter* ClassLoader::_perf_class_parse_selftime = NULL;
123 PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL;
124 PerfCounter* ClassLoader::_perf_shared_classload_time = NULL;
125 PerfCounter* ClassLoader::_perf_sys_classload_time = NULL;
126 PerfCounter* ClassLoader::_perf_app_classload_time = NULL;
127 PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL;
128 PerfCounter* ClassLoader::_perf_app_classload_count = NULL;
129 PerfCounter* ClassLoader::_perf_define_appclasses = NULL;
130 PerfCounter* ClassLoader::_perf_define_appclass_time = NULL;
131 PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL;
132 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL;
133 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL;
134 PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
135 PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
136 PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
137 PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
138 PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
139 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL;
140 PerfCounter* ClassLoader::_isUnsyncloadClass = NULL;
141 PerfCounter* ClassLoader::_load_instance_class_failCounter = NULL;
142
143 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = NULL;
144 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = NULL;
145 ClassPathEntry* ClassLoader::_jrt_entry = NULL;
146 ClassPathEntry* ClassLoader::_first_append_entry = NULL;
147 ClassPathEntry* ClassLoader::_last_append_entry = NULL;
148 int ClassLoader::_num_entries = 0;
149 int ClassLoader::_num_boot_entries = -1;
150 #if INCLUDE_CDS
151 GrowableArray<char*>* ClassLoader::_boot_modules_array = NULL;
152 GrowableArray<char*>* ClassLoader::_platform_modules_array = 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 size_t path_len = strlen(_dir) + strlen(name) + strlen(os::file_separator()) + 1;
266 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, path_len);
267 int len = jio_snprintf(path, path_len, "%s%s%s", _dir, os::file_separator(), name);
268 assert(len == (int)(path_len - 1), "sanity");
269 // check if file exists
270 struct stat st;
271 if (os::stat(path, &st) == 0) {
272 #if INCLUDE_CDS
273 if (DumpSharedSpaces) {
274 // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so
275 // we should never find a file underneath it -- unless user has added a new file while we are running
276 // the dump, in which case let's quit!
277 ShouldNotReachHere();
278 }
279 #endif
280 // found file, open it
281 int file_handle = os::open(path, 0, 0);
282 if (file_handle != -1) {
283 // read contents into resource array
284 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
285 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
286 // close file
287 os::close(file_handle);
288 // construct ClassFileStream
289 if (num_read == (size_t)st.st_size) {
290 if (UsePerfData) {
291 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
292 }
293 FREE_RESOURCE_ARRAY(char, path, path_len);
294 // Resource allocated
295 return new ClassFileStream(buffer,
296 st.st_size,
297 _dir,
298 ClassFileStream::verify);
299 }
300 }
301 }
302 FREE_RESOURCE_ARRAY(char, path, path_len);
303 return NULL;
304 }
305
306 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name, bool is_boot_append) : ClassPathEntry() {
307 _zip = zip;
308 char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
309 strcpy(copy, zip_name);
310 _zip_name = copy;
311 _is_boot_append = is_boot_append;
312 _multi_versioned = _unknown;
313 }
314
315 ClassPathZipEntry::~ClassPathZipEntry() {
316 if (ZipClose != NULL) {
317 (*ZipClose)(_zip);
318 }
319 FREE_C_HEAP_ARRAY(char, _zip_name);
320 }
321
322 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
323 // enable call to C land
324 JavaThread* thread = JavaThread::current();
325 ThreadToNativeFromVM ttn(thread);
326 // check whether zip archive contains name
327 jint name_len;
328 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
329 if (entry == NULL) return NULL;
330 u1* buffer;
331 char name_buf[128];
332 char* filename;
333 if (name_len < 128) {
334 filename = name_buf;
335 } else {
336 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
337 }
338
339 // read contents into resource array
340 int size = (*filesize) + ((nul_terminate) ? 1 : 0);
341 buffer = NEW_RESOURCE_ARRAY(u1, size);
342 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
343
344 // return result
345 if (nul_terminate) {
346 buffer[*filesize] = 0;
347 }
348 return buffer;
349 }
350
351 #if INCLUDE_CDS
352 u1* ClassPathZipEntry::open_versioned_entry(const char* name, jint* filesize, TRAPS) {
353 u1* buffer = NULL;
354 if (DumpSharedSpaces && !_is_boot_append) {
355 // We presume default is multi-release enabled
356 const char* multi_ver = Arguments::get_property("jdk.util.jar.enableMultiRelease");
357 const char* verstr = Arguments::get_property("jdk.util.jar.version");
358 bool is_multi_ver = (multi_ver == NULL ||
359 strcmp(multi_ver, "true") == 0 ||
360 strcmp(multi_ver, "force") == 0) &&
361 is_multiple_versioned(THREAD);
362 // command line version setting
363 int version = 0;
364 const int base_version = 8; // JDK8
365 int cur_ver = JDK_Version::current().major_version();
366 if (verstr != NULL) {
367 version = atoi(verstr);
368 if (version < base_version || version > cur_ver) {
369 // If the specified version is lower than the base version, the base
370 // entry will be used; if the version is higher than the current
371 // jdk version, the highest versioned entry will be used.
372 if (version < base_version) {
373 is_multi_ver = false;
374 }
375 // print out warning, do not use assertion here since it will continue to look
376 // for proper version.
377 warning("JDK%d is not supported in multiple version jars", version);
378 }
379 }
380
381 if (is_multi_ver) {
382 int n;
383 const char* version_entry = "META-INF/versions/";
384 // 10 is the max length of a decimal 32-bit non-negative number
385 // 2 includes the '/' and trailing zero
386 size_t entry_name_len = strlen(version_entry) + 10 + strlen(name) + 2;
387 char* entry_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, entry_name_len);
388 if (version > 0) {
389 n = jio_snprintf(entry_name, entry_name_len, "%s%d/%s", version_entry, version, name);
390 entry_name[n] = '\0';
391 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
392 if (buffer == NULL) {
393 warning("Could not find %s in %s, try to find highest version instead", entry_name, _zip_name);
394 }
395 }
396 if (buffer == NULL) {
397 for (int i = cur_ver; i >= base_version; i--) {
398 n = jio_snprintf(entry_name, entry_name_len, "%s%d/%s", version_entry, i, name);
399 entry_name[n] = '\0';
400 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
401 if (buffer != NULL) {
402 break;
403 }
404 }
405 }
406 FREE_RESOURCE_ARRAY(char, entry_name, entry_name_len);
407 }
408 }
409 return buffer;
410 }
411
412 bool ClassPathZipEntry::is_multiple_versioned(TRAPS) {
413 assert(DumpSharedSpaces, "called only at dump time");
414 if (_multi_versioned != _unknown) {
415 return (_multi_versioned == _yes) ? true : false;
416 }
417 jint size;
418 char* buffer = (char*)open_entry("META-INF/MANIFEST.MF", &size, true, CHECK_false);
419 if (buffer != NULL) {
420 char* p = buffer;
421 for ( ; *p; ++p) *p = tolower(*p);
422 if (strstr(buffer, "multi-release: true") != NULL) {
423 _multi_versioned = _yes;
424 return true;
425 }
426 }
427 _multi_versioned = _no;
428 return false;
429 }
430 #endif // INCLUDE_CDS
431
432 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
433 jint filesize;
434 u1* buffer = open_versioned_entry(name, &filesize, CHECK_NULL);
435 if (buffer == NULL) {
436 buffer = open_entry(name, &filesize, false, CHECK_NULL);
437 if (buffer == NULL) {
438 return NULL;
439 }
440 }
441 if (UsePerfData) {
442 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
443 }
444 // Resource allocated
445 return new ClassFileStream(buffer,
446 filesize,
447 _zip_name,
448 ClassFileStream::verify);
449 }
450
451 // invoke function for each entry in the zip file
452 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
453 JavaThread* thread = JavaThread::current();
454 HandleMark handle_mark(thread);
455 ThreadToNativeFromVM ttn(thread);
456 for (int n = 0; ; n++) {
457 jzentry * ze = ((*GetNextEntry)(_zip, n));
458 if (ze == NULL) break;
459 (*f)(ze->name, context);
460 }
461 }
462
463 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
464 ClassPathEntry(),
465 _jimage(jimage) {
466 guarantee(jimage != NULL, "jimage file is null");
467 guarantee(name != NULL, "jimage file name is null");
468 size_t len = strlen(name) + 1;
469 _name = NEW_C_HEAP_ARRAY(const char, len, mtClass);
470 strncpy((char *)_name, name, len);
471 }
472
473 ClassPathImageEntry::~ClassPathImageEntry() {
474 if (_name != NULL) {
475 FREE_C_HEAP_ARRAY(const char, _name);
476 _name = NULL;
477 }
478 if (_jimage != NULL) {
479 (*JImageClose)(_jimage);
480 _jimage = NULL;
481 }
482 }
483
484 // For a class in a named module, look it up in the jimage file using this syntax:
485 // /<module-name>/<package-name>/<base-class>
486 //
487 // Assumptions:
488 // 1. There are no unnamed modules in the jimage file.
489 // 2. A package is in at most one module in the jimage file.
490 //
491 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
492 jlong size;
493 JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size);
494
495 if (location == 0) {
496 ResourceMark rm;
497 const char* pkg_name = ClassLoader::package_from_name(name);
498
499 if (pkg_name != NULL) {
500 if (!Universe::is_module_initialized()) {
501 location = (*JImageFindResource)(_jimage, JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
502 #if INCLUDE_CDS
503 // CDS uses the boot class loader to load classes whose packages are in
504 // modules defined for other class loaders. So, for now, get their module
505 // names from the "modules" jimage file.
506 if (DumpSharedSpaces && location == 0) {
507 const char* module_name = (*JImagePackageToModule)(_jimage, pkg_name);
508 if (module_name != NULL) {
509 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
510 }
511 }
512 #endif
513
514 } else {
515 PackageEntry* package_entry = ClassLoader::get_package_entry(name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
516 if (package_entry != NULL) {
517 ResourceMark rm;
518 // Get the module name
519 ModuleEntry* module = package_entry->module();
520 assert(module != NULL, "Boot classLoader package missing module");
521 assert(module->is_named(), "Boot classLoader package is in unnamed module");
522 const char* module_name = module->name()->as_C_string();
523 if (module_name != NULL) {
524 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
525 }
526 }
527 }
528 }
529 }
530 if (location != 0) {
531 if (UsePerfData) {
532 ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
533 }
534 char* data = NEW_RESOURCE_ARRAY(char, size);
535 (*JImageGetResource)(_jimage, location, data, size);
536 // Resource allocated
537 return new ClassFileStream((u1*)data,
538 (int)size,
539 _name,
540 ClassFileStream::verify);
541 }
542
543 return NULL;
544 }
545
546 JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf,
547 const char* module_name,
548 const char* file_name,
549 jlong &size) {
550 return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size));
551 }
552
553 #ifndef PRODUCT
554 bool ctw_visitor(JImageFile* jimage,
555 const char* module_name, const char* version, const char* package,
556 const char* name, const char* extension, void* arg) {
557 if (strcmp(extension, "class") == 0) {
558 Thread* THREAD = Thread::current();
559 ResourceMark rm(THREAD);
560 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JIMAGE_MAX_PATH);
561 jio_snprintf(path, JIMAGE_MAX_PATH - 1, "%s/%s.class", package, name);
562 ClassLoader::compile_the_world_in(path, *(Handle*)arg, THREAD);
563 return !HAS_PENDING_EXCEPTION;
564 }
565 return true;
566 }
567
568 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) {
569 tty->print_cr("CompileTheWorld : Compiling all classes in %s", name());
570 tty->cr();
571 (*JImageResourceIterator)(_jimage, (JImageResourceVisitor_t)ctw_visitor, (void *)&loader);
572 if (HAS_PENDING_EXCEPTION) {
573 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
574 CLEAR_PENDING_EXCEPTION;
575 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
576 tty->print_cr("Increase class metadata storage if a limit was set");
577 } else {
578 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
579 }
580 }
581 }
582 #endif
583
584 bool ClassPathImageEntry::is_modules_image() const {
585 return ClassLoader::is_modules_image(name());
586 }
587
588 #if INCLUDE_CDS
589 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
590 assert(DumpSharedSpaces, "only called at dump time");
591 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure");
592 vm_exit_during_initialization(error, message);
593 }
594 #endif
595
596 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
597 _module_name = module_name;
598 _module_first_entry = NULL;
599 _module_last_entry = NULL;
600 }
601
602 ModuleClassPathList::~ModuleClassPathList() {
603 // Clean out each ClassPathEntry on list
604 ClassPathEntry* e = _module_first_entry;
605 while (e != NULL) {
606 ClassPathEntry* next_entry = e->next();
607 delete e;
608 e = next_entry;
609 }
610 }
611
612 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
613 if (new_entry != NULL) {
614 if (_module_last_entry == NULL) {
615 _module_first_entry = _module_last_entry = new_entry;
616 } else {
617 _module_last_entry->set_next(new_entry);
618 _module_last_entry = new_entry;
619 }
620 }
621 }
622
623 void ClassLoader::trace_class_path(const char* msg, const char* name) {
624 LogTarget(Info, class, path) lt;
625 if (lt.is_enabled()) {
626 LogStream ls(lt);
627 if (msg) {
628 ls.print("%s", msg);
629 }
630 if (name) {
631 if (strlen(name) < 256) {
632 ls.print("%s", name);
633 } else {
634 // For very long paths, we need to print each character separately,
635 // as print_cr() has a length limit
636 while (name[0] != '\0') {
637 ls.print("%c", name[0]);
638 name++;
639 }
640 }
641 }
642 ls.cr();
643 }
644 }
645
646 #if INCLUDE_CDS
647 void ClassLoader::check_shared_classpath(const char *path) {
648 if (strcmp(path, "") == 0) {
649 exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
650 }
651
652 struct stat st;
653 if (os::stat(path, &st) == 0) {
654 if ((st.st_mode & S_IFMT) != S_IFREG) { // is not a regular file
655 if (!os::dir_is_empty(path)) {
656 tty->print_cr("Error: non-empty directory '%s'", path);
657 exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL);
658 }
659 }
660 }
661 }
662 #endif
663
664 void ClassLoader::setup_bootstrap_search_path() {
665 const char* sys_class_path = Arguments::get_sysclasspath();
666 const char* java_class_path = Arguments::get_appclasspath();
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 trace_class_path("classpath: ", java_class_path);
673 }
674 #if INCLUDE_CDS
675 if (DumpSharedSpaces) {
676 _shared_paths_misc_info->add_boot_classpath(sys_class_path);
677 }
678 #endif
679 setup_search_path(sys_class_path, true);
680 }
681
682 #if INCLUDE_CDS
683 int ClassLoader::get_shared_paths_misc_info_size() {
684 return _shared_paths_misc_info->get_used_bytes();
685 }
686
687 void* ClassLoader::get_shared_paths_misc_info() {
688 return _shared_paths_misc_info->buffer();
689 }
690
691 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
692 SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
693 bool result = checker->check();
694 delete checker;
695 return result;
696 }
697 #endif
698
699 // Construct the array of module/path pairs as specified to --patch-module
700 // for the boot loader to search ahead of the jimage, if the class being
701 // loaded is defined to a module that has been specified to --patch-module.
702 void ClassLoader::setup_patch_mod_entries() {
703 Thread* THREAD = Thread::current();
704 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
705 int num_of_entries = patch_mod_args->length();
706
707
708 // Set up the boot loader's _patch_mod_entries list
709 _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true);
710
711 for (int i = 0; i < num_of_entries; i++) {
712 const char* module_name = (patch_mod_args->at(i))->module_name();
713 Symbol* const module_sym = SymbolTable::lookup(module_name, (int)strlen(module_name), CHECK);
714 assert(module_sym != NULL, "Failed to obtain Symbol for module name");
715 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
716
717 char* class_path = (patch_mod_args->at(i))->path_string();
718 int len = (int)strlen(class_path);
719 int end = 0;
720 // Iterate over the module's class path entries
721 for (int start = 0; start < len; start = end) {
722 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
723 end++;
724 }
725 EXCEPTION_MARK;
726 ResourceMark rm(THREAD);
727 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
728 strncpy(path, &class_path[start], end - start);
729 path[end - start] = '\0';
730
731 struct stat st;
732 if (os::stat(path, &st) == 0) {
733 // File or directory found
734 Thread* THREAD = Thread::current();
735 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
736 // If the path specification is valid, enter it into this module's list
737 if (new_entry != NULL) {
738 module_cpl->add_to_list(new_entry);
739 }
740 }
741
742 while (class_path[end] == os::path_separator()[0]) {
743 end++;
744 }
745 }
746
747 // Record the module into the list of --patch-module entries only if
748 // valid ClassPathEntrys have been created
749 if (module_cpl->module_first_entry() != NULL) {
750 _patch_mod_entries->push(module_cpl);
751 }
752 }
753 }
754
755 // Determine whether the module has been patched via the command-line
756 // option --patch-module
757 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
758 if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) {
759 int table_len = _patch_mod_entries->length();
760 for (int i = 0; i < table_len; i++) {
761 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
762 if (module_name->fast_compare(patch_mod->module_name()) == 0) {
763 return true;
764 }
765 }
766 }
767 return false;
768 }
769
770 void ClassLoader::setup_search_path(const char *class_path, bool bootstrap_search) {
771 int len = (int)strlen(class_path);
772 int end = 0;
773 bool set_base_piece = bootstrap_search;
774
775 // Iterate over class path entries
776 for (int start = 0; start < len; start = end) {
777 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
778 end++;
779 }
780 EXCEPTION_MARK;
781 ResourceMark rm(THREAD);
782 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
783 strncpy(path, &class_path[start], end - start);
784 path[end - start] = '\0';
785
786 // The first time through the bootstrap_search setup, it must be determined
787 // what the base or core piece of the boot loader search is. Either a java runtime
788 // image is present or this is an exploded module build situation.
789 if (set_base_piece) {
790 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
791 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
792 struct stat st;
793 if (os::stat(path, &st) == 0) {
794 // Directory found
795 Thread* THREAD = Thread::current();
796 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
797
798 // Check for a jimage
799 if (Arguments::has_jimage()) {
800 assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice");
801 assert(new_entry != NULL && new_entry->is_modules_image(), "No java runtime image present");
802 _jrt_entry = new_entry;
803 ++_num_entries;
804 #if INCLUDE_CDS
805 if (DumpSharedSpaces) {
806 JImageFile *jimage = _jrt_entry->jimage();
807 assert(jimage != NULL, "No java runtime image file present");
808 }
809 #endif
810 }
811 } else {
812 // If path does not exist, exit
813 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
814 }
815 set_base_piece = false;
816 } else {
817 // Every entry on the system boot class path after the initial base piece,
818 // which is set by os::set_boot_path(), is considered an appended entry.
819 update_class_path_entry_list(path, false, bootstrap_search);
820 }
821
822 #if INCLUDE_CDS
823 if (DumpSharedSpaces) {
824 check_shared_classpath(path);
825 }
826 #endif
827 while (class_path[end] == os::path_separator()[0]) {
828 end++;
829 }
830 }
831 }
832
833 // During an exploded modules build, each module defined to the boot loader
834 // will be added to the ClassLoader::_exploded_entries array.
835 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) {
836 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
837 assert(_exploded_entries != NULL, "_exploded_entries was not initialized");
838
839 // Find the module's symbol
840 ResourceMark rm(THREAD);
841 const char *module_name = module_sym->as_C_string();
842 const char *home = Arguments::get_java_home();
843 const char file_sep = os::file_separator()[0];
844 // 10 represents the length of "modules" + 2 file separators + \0
845 size_t len = strlen(home) + strlen(module_name) + 10;
846 char *path = NEW_C_HEAP_ARRAY(char, len, mtModule);
847 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
848
849 struct stat st;
850 if (os::stat(path, &st) == 0) {
851 // Directory found
852 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
853
854 // If the path specification is valid, enter it into this module's list.
855 // There is no need to check for duplicate modules in the exploded entry list,
856 // since no two modules with the same name can be defined to the boot loader.
857 // This is checked at module definition time in Modules::define_module.
858 if (new_entry != NULL) {
859 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
860 module_cpl->add_to_list(new_entry);
861 {
862 MutexLocker ml(Module_lock, THREAD);
863 _exploded_entries->push(module_cpl);
864 }
865 log_info(class, load)("path: %s", path);
866 }
867 }
868 FREE_C_HEAP_ARRAY(char, path);
869 }
870
871 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
872 bool throw_exception,
873 bool is_boot_append, TRAPS) {
874 JavaThread* thread = JavaThread::current();
875 ClassPathEntry* new_entry = NULL;
876 if ((st->st_mode & S_IFMT) == S_IFREG) {
877 ResourceMark rm(thread);
878 // Regular file, should be a zip or jimage file
879 // Canonicalized filename
880 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
881 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
882 // This matches the classic VM
883 if (throw_exception) {
884 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
885 } else {
886 return NULL;
887 }
888 }
889 jint error;
890 JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
891 if (jimage != NULL) {
892 new_entry = new ClassPathImageEntry(jimage, canonical_path);
893 } else {
894 char* error_msg = NULL;
895 jzfile* zip;
896 {
897 // enable call to C land
898 ThreadToNativeFromVM ttn(thread);
899 HandleMark hm(thread);
900 zip = (*ZipOpen)(canonical_path, &error_msg);
901 }
902 if (zip != NULL && error_msg == NULL) {
903 new_entry = new ClassPathZipEntry(zip, path, is_boot_append);
904 } else {
905 char *msg;
906 if (error_msg == NULL) {
907 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ;
908 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
909 } else {
910 int len = (int)(strlen(path) + strlen(error_msg) + 128);
911 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ;
912 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
913 }
914 // Don't complain about bad jar files added via -Xbootclasspath/a:.
915 if (throw_exception && is_init_completed()) {
916 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
917 } else {
918 return NULL;
919 }
920 }
921 }
922 log_info(class, path)("opened: %s", path);
923 log_info(class, load)("opened: %s", path);
924 } else {
925 // Directory
926 new_entry = new ClassPathDirEntry(path);
927 log_info(class, load)("path: %s", path);
928 }
929 return new_entry;
930 }
931
932
933 // Create a class path zip entry for a given path (return NULL if not found
934 // or zip/JAR file cannot be opened)
935 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
936 // check for a regular file
937 struct stat st;
938 if (os::stat(path, &st) == 0) {
939 if ((st.st_mode & S_IFMT) == S_IFREG) {
940 char canonical_path[JVM_MAXPATHLEN];
941 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
942 char* error_msg = NULL;
943 jzfile* zip;
944 {
945 // enable call to C land
946 JavaThread* thread = JavaThread::current();
947 ThreadToNativeFromVM ttn(thread);
948 HandleMark hm(thread);
949 zip = (*ZipOpen)(canonical_path, &error_msg);
950 }
951 if (zip != NULL && error_msg == NULL) {
952 // create using canonical path
953 return new ClassPathZipEntry(zip, canonical_path, is_boot_append);
954 }
955 }
956 }
957 }
958 return NULL;
959 }
960
961 // returns true if entry already on class path
962 bool ClassLoader::contains_append_entry(const char* name) {
963 ClassPathEntry* e = _first_append_entry;
964 while (e != NULL) {
965 // assume zip entries have been canonicalized
966 if (strcmp(name, e->name()) == 0) {
967 return true;
968 }
969 e = e->next();
970 }
971 return false;
972 }
973
974 void ClassLoader::add_to_list(ClassPathEntry *new_entry) {
975 if (new_entry != NULL) {
976 if (_last_append_entry == NULL) {
977 assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty");
978 _first_append_entry = _last_append_entry = new_entry;
979 } else {
980 _last_append_entry->set_next(new_entry);
981 _last_append_entry = new_entry;
982 }
983 }
984 _num_entries++;
985 }
986
987 void ClassLoader::add_to_list(const char *apath) {
988 update_class_path_entry_list((char*)apath, false, false);
989 }
990
991 // Returns true IFF the file/dir exists and the entry was successfully created.
992 bool ClassLoader::update_class_path_entry_list(const char *path,
993 bool check_for_duplicates,
994 bool is_boot_append,
995 bool throw_exception) {
996 struct stat st;
997 if (os::stat(path, &st) == 0) {
998 // File or directory found
999 ClassPathEntry* new_entry = NULL;
1000 Thread* THREAD = Thread::current();
1001 new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false));
1002 if (new_entry == NULL) {
1003 return false;
1004 }
1005
1006 // Do not reorder the bootclasspath which would break get_system_package().
1007 // Add new entry to linked list
1008 if (!check_for_duplicates || !contains_append_entry(new_entry->name())) {
1009 ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry);
1010 }
1011 return true;
1012 } else {
1013 #if INCLUDE_CDS
1014 if (DumpSharedSpaces) {
1015 _shared_paths_misc_info->add_nonexist_path(path);
1016 }
1017 #endif
1018 return false;
1019 }
1020 }
1021
1022 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
1023 ResourceMark rm;
1024 int num_of_entries = module_list->length();
1025 for (int i = 0; i < num_of_entries; i++) {
1026 ClassPathEntry* e;
1027 ModuleClassPathList* mpl = module_list->at(i);
1028 tty->print("%s=", mpl->module_name()->as_C_string());
1029 e = mpl->module_first_entry();
1030 while (e != NULL) {
1031 tty->print("%s", e->name());
1032 e = e->next();
1033 if (e != NULL) {
1034 tty->print("%s", os::path_separator());
1035 }
1036 }
1037 tty->print(" ;");
1038 }
1039 }
1040
1041 void ClassLoader::print_bootclasspath() {
1042 ClassPathEntry* e;
1043 tty->print("[bootclasspath= ");
1044
1045 // Print --patch-module module/path specifications first
1046 if (_patch_mod_entries != NULL) {
1047 print_module_entry_table(_patch_mod_entries);
1048 }
1049
1050 // [jimage | exploded modules build]
1051 if (has_jrt_entry()) {
1052 // Print the location of the java runtime image
1053 tty->print("%s ;", _jrt_entry->name());
1054 } else {
1055 // Print exploded module build path specifications
1056 if (_exploded_entries != NULL) {
1057 print_module_entry_table(_exploded_entries);
1058 }
1059 }
1060
1061 // appended entries
1062 e = _first_append_entry;
1063 while (e != NULL) {
1064 tty->print("%s ;", e->name());
1065 e = e->next();
1066 }
1067 tty->print_cr("]");
1068 }
1069
1070 void ClassLoader::load_zip_library() {
1071 assert(ZipOpen == NULL, "should not load zip library twice");
1072 // First make sure native library is loaded
1073 os::native_java_library();
1074 // Load zip library
1075 char path[JVM_MAXPATHLEN];
1076 char ebuf[1024];
1077 void* handle = NULL;
1078 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
1079 handle = os::dll_load(path, ebuf, sizeof ebuf);
1080 }
1081 if (handle == NULL) {
1082 vm_exit_during_initialization("Unable to load ZIP library", path);
1083 }
1084 // Lookup zip entry points
1085 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
1086 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
1087 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
1088 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
1089 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
1090 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
1091 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
1092
1093 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
1094 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
1095 GetNextEntry == NULL || Crc32 == NULL) {
1096 vm_exit_during_initialization("Corrupted ZIP library", path);
1097 }
1098
1099 if (ZipInflateFully == NULL) {
1100 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
1101 }
1102
1103 // Lookup canonicalize entry in libjava.dll
1104 void *javalib_handle = os::native_java_library();
1105 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
1106 // This lookup only works on 1.3. Do not check for non-null here
1107 }
1108
1109 void ClassLoader::load_jimage_library() {
1110 // First make sure native library is loaded
1111 os::native_java_library();
1112 // Load jimage library
1113 char path[JVM_MAXPATHLEN];
1114 char ebuf[1024];
1115 void* handle = NULL;
1116 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
1117 handle = os::dll_load(path, ebuf, sizeof ebuf);
1118 }
1119 if (handle == NULL) {
1120 vm_exit_during_initialization("Unable to load jimage library", path);
1121 }
1122
1123 // Lookup jimage entry points
1124 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open"));
1125 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found");
1126 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close"));
1127 guarantee(JImageClose != NULL, "function JIMAGE_Close not found");
1128 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule"));
1129 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found");
1130 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource"));
1131 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found");
1132 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource"));
1133 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found");
1134 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator"));
1135 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found");
1136 JImageResourcePath = CAST_TO_FN_PTR(JImage_ResourcePath_t, os::dll_lookup(handle, "JIMAGE_ResourcePath"));
1137 guarantee(JImageResourcePath != NULL, "function JIMAGE_ResourcePath not found");
1138 }
1139
1140 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
1141 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
1142 }
1143
1144 int ClassLoader::crc32(int crc, const char* buf, int len) {
1145 assert(Crc32 != NULL, "ZIP_CRC32 is not found");
1146 return (*Crc32)(crc, (const jbyte*)buf, len);
1147 }
1148
1149 // Function add_package extracts the package from the fully qualified class name
1150 // and checks if the package is in the boot loader's package entry table. If so,
1151 // then it sets the classpath_index in the package entry record.
1152 //
1153 // The classpath_index field is used to find the entry on the boot loader class
1154 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
1155 // in an unnamed module. It is also used to indicate (for all packages whose
1156 // classes are loaded by the boot loader) that at least one of the package's
1157 // classes has been loaded.
1158 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) {
1159 assert(fullq_class_name != NULL, "just checking");
1160
1161 // Get package name from fully qualified class name.
1162 ResourceMark rm;
1163 const char *cp = package_from_name(fullq_class_name);
1164 if (cp != NULL) {
1165 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();
1166 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp, CHECK_false);
1167 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol);
1168 if (pkg_entry != NULL) {
1169 assert(classpath_index != -1, "Unexpected classpath_index");
1170 pkg_entry->set_classpath_index(classpath_index);
1171 } else {
1172 return false;
1173 }
1174 }
1175 return true;
1176 }
1177
1178 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1179 // Look up the name in the boot loader's package entry table.
1180 if (name != NULL) {
1181 TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL);
1182 // Look for the package entry in the boot loader's package entry table.
1183 PackageEntry* package =
1184 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1185
1186 // Return NULL if package does not exist or if no classes in that package
1187 // have been loaded.
1188 if (package != NULL && package->has_loaded_class()) {
1189 ModuleEntry* module = package->module();
1190 if (module->location() != NULL) {
1191 ResourceMark rm(THREAD);
1192 Handle ml = java_lang_String::create_from_str(
1193 module->location()->as_C_string(), THREAD);
1194 return ml();
1195 }
1196 // Return entry on boot loader class path.
1197 Handle cph = java_lang_String::create_from_str(
1198 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1199 return cph();
1200 }
1201 }
1202 return NULL;
1203 }
1204
1205 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1206 ResourceMark rm(THREAD);
1207 // List of pointers to PackageEntrys that have loaded classes.
1208 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
1209 {
1210 MutexLocker ml(Module_lock, THREAD);
1211
1212 PackageEntryTable* pe_table =
1213 ClassLoaderData::the_null_class_loader_data()->packages();
1214
1215 // Collect the packages that have at least one loaded class.
1216 for (int x = 0; x < pe_table->table_size(); x++) {
1217 for (PackageEntry* package_entry = pe_table->bucket(x);
1218 package_entry != NULL;
1219 package_entry = package_entry->next()) {
1220 if (package_entry->has_loaded_class()) {
1221 loaded_class_pkgs->append(package_entry);
1222 }
1223 }
1224 }
1225 }
1226
1227
1228 // Allocate objArray and fill with java.lang.String
1229 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1230 loaded_class_pkgs->length(), CHECK_NULL);
1231 objArrayHandle result(THREAD, r);
1232 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1233 PackageEntry* package_entry = loaded_class_pkgs->at(x);
1234 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1235 result->obj_at_put(x, str());
1236 }
1237 return result();
1238 }
1239
1240 // caller needs ResourceMark
1241 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1242 int class_name_len) {
1243 assert(class_name != NULL, "invariant");
1244 assert((int)strlen(class_name) == class_name_len, "invariant");
1245
1246 static const char class_suffix[] = ".class";
1247
1248 char* const file_name = NEW_RESOURCE_ARRAY(char,
1249 class_name_len +
1250 sizeof(class_suffix)); // includes term NULL
1251
1252 strncpy(file_name, class_name, class_name_len);
1253 strncpy(&file_name[class_name_len], class_suffix, sizeof(class_suffix));
1254
1255 return file_name;
1256 }
1257
1258 ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
1259 const GrowableArray<ModuleClassPathList*>* const module_list) {
1260 int num_of_entries = module_list->length();
1261 const Symbol* class_module_name = mod_entry->name();
1262
1263 // Loop through all the modules in either the patch-module or exploded entries looking for module
1264 for (int i = 0; i < num_of_entries; i++) {
1265 ModuleClassPathList* module_cpl = module_list->at(i);
1266 Symbol* module_cpl_name = module_cpl->module_name();
1267
1268 if (module_cpl_name->fast_compare(class_module_name) == 0) {
1269 // Class' module has been located.
1270 return module_cpl->module_first_entry();
1271 }
1272 }
1273 return NULL;
1274 }
1275
1276
1277 // Search either the patch-module or exploded build entries for class.
1278 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list,
1279 const char* const class_name,
1280 const char* const file_name,
1281 TRAPS) {
1282 ClassFileStream* stream = NULL;
1283
1284 // Find the class' defining module in the boot loader's module entry table
1285 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
1286 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL;
1287
1288 // If the module system has not defined java.base yet, then
1289 // classes loaded are assumed to be defined to java.base.
1290 // When java.base is eventually defined by the module system,
1291 // all packages of classes that have been previously loaded
1292 // are verified in ModuleEntryTable::verify_javabase_packages().
1293 if (!Universe::is_module_initialized() &&
1294 !ModuleEntryTable::javabase_defined() &&
1295 mod_entry == NULL) {
1296 mod_entry = ModuleEntryTable::javabase_moduleEntry();
1297 }
1298
1299 // The module must be a named module
1300 ClassPathEntry* e = NULL;
1301 if (mod_entry != NULL && mod_entry->is_named()) {
1302 if (module_list == _exploded_entries) {
1303 // The exploded build entries can be added to at any time so a lock is
1304 // needed when searching them.
1305 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
1306 MutexLocker ml(Module_lock, THREAD);
1307 e = find_first_module_cpe(mod_entry, module_list);
1308 } else {
1309 e = find_first_module_cpe(mod_entry, module_list);
1310 }
1311 }
1312
1313 // Try to load the class from the module's ClassPathEntry list.
1314 while (e != NULL) {
1315 stream = e->open_stream(file_name, CHECK_NULL);
1316 // No context.check is required since CDS is not supported
1317 // for an exploded modules build or if --patch-module is specified.
1318 if (NULL != stream) {
1319 return stream;
1320 }
1321 e = e->next();
1322 }
1323 // If the module was located, break out even if the class was not
1324 // located successfully from that module's ClassPathEntry list.
1325 // There will not be another valid entry for that module.
1326 return NULL;
1327 }
1328
1329 InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1330 assert(name != NULL, "invariant");
1331 assert(THREAD->is_Java_thread(), "must be a JavaThread");
1332
1333 ResourceMark rm(THREAD);
1334 HandleMark hm(THREAD);
1335
1336 const char* const class_name = name->as_C_string();
1337
1338 EventMark m("loading class %s", class_name);
1339
1340 const char* const file_name = file_name_for_class_name(class_name,
1341 name->utf8_length());
1342 assert(file_name != NULL, "invariant");
1343
1344 ClassLoaderExt::Context context(class_name, file_name, THREAD);
1345
1346 // Lookup stream for parsing .class file
1347 ClassFileStream* stream = NULL;
1348 s2 classpath_index = 0;
1349 ClassPathEntry* e = NULL;
1350
1351 // If DumpSharedSpaces is true boot loader visibility boundaries are set to:
1352 // - [jimage] + [_first_append_entry to _last_append_entry] (all path entries).
1353 //
1354 // If search_append_only is true, boot loader visibility boundaries are
1355 // set to be _first_append_entry to the end. This includes:
1356 // [-Xbootclasspath/a]; [jvmti appended entries]
1357 //
1358 // If both DumpSharedSpaces and search_append_only are false, boot loader
1359 // visibility boundaries are set to be the --patch-module entries plus the base piece.
1360 // This would include:
1361 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1362 //
1363
1364 // Load Attempt #1: --patch-module
1365 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1366 // attempt to load the class from those locations specific to the module.
1367 // Specifications to --patch-module can contain a partial number of classes
1368 // that are part of the overall module definition. So if a particular class is not
1369 // found within its module specification, the search should continue to Load Attempt #2.
1370 // Note: The --patch-module entries are never searched if the boot loader's
1371 // visibility boundary is limited to only searching the append entries.
1372 if (_patch_mod_entries != NULL && !search_append_only) {
1373 // At CDS dump time, the --patch-module entries are ignored. That means a
1374 // class is still loaded from the runtime image even if it might
1375 // appear in the _patch_mod_entries. The runtime shared class visibility
1376 // check will determine if a shared class is visible based on the runtime
1377 // environemnt, including the runtime --patch-module setting.
1378 if (!DumpSharedSpaces) {
1379 stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL);
1380 }
1381 }
1382
1383 // Load Attempt #2: [jimage | exploded build]
1384 if (!search_append_only && (NULL == stream)) {
1385 if (has_jrt_entry()) {
1386 e = _jrt_entry;
1387 stream = _jrt_entry->open_stream(file_name, CHECK_NULL);
1388 if (!context.check(stream, classpath_index)) {
1389 return NULL;
1390 }
1391 } else {
1392 // Exploded build - attempt to locate class in its defining module's location.
1393 assert(_exploded_entries != NULL, "No exploded build entries present");
1394 stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL);
1395 }
1396 }
1397
1398 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1399 if ((search_append_only || DumpSharedSpaces) && (NULL == stream)) {
1400 // For the boot loader append path search, the starting classpath_index
1401 // for the appended piece is always 1 to account for either the
1402 // _jrt_entry or the _exploded_entries.
1403 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1404 classpath_index = 1;
1405
1406 e = _first_append_entry;
1407 while (e != NULL) {
1408 if (DumpSharedSpaces && classpath_index >= _num_boot_entries) {
1409 // Do not load any class from the app classpath using the boot loader. Let
1410 // the built-in app class laoder load them.
1411 break;
1412 }
1413 stream = e->open_stream(file_name, CHECK_NULL);
1414 if (!context.check(stream, classpath_index)) {
1415 return NULL;
1416 }
1417 if (NULL != stream) {
1418 break;
1419 }
1420 e = e->next();
1421 ++classpath_index;
1422 }
1423 }
1424
1425 if (NULL == stream) {
1426 return NULL;
1427 }
1428
1429 stream->set_verify(context.should_verify(classpath_index));
1430
1431 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1432 Handle protection_domain;
1433
1434 InstanceKlass* result = KlassFactory::create_from_stream(stream,
1435 name,
1436 loader_data,
1437 protection_domain,
1438 NULL, // host_klass
1439 NULL, // cp_patches
1440 THREAD);
1441 if (HAS_PENDING_EXCEPTION) {
1442 if (DumpSharedSpaces) {
1443 tty->print_cr("Preload Error: Failed to load %s", class_name);
1444 }
1445 return NULL;
1446 }
1447
1448 return context.record_result(name, e, classpath_index, result, THREAD);
1449 }
1450
1451 #if INCLUDE_CDS
1452 static char* skip_uri_protocol(char* source) {
1453 if (strncmp(source, "file:", 5) == 0) {
1454 // file: protocol path could start with file:/ or file:///
1455 // locate the char after all the forward slashes
1456 int offset = 5;
1457 while (*(source + offset) == '/') {
1458 offset++;
1459 }
1460 source += offset;
1461 // for non-windows platforms, move back one char as the path begins with a '/'
1462 #ifndef _WINDOWS
1463 source -= 1;
1464 #endif
1465 } else if (strncmp(source, "jrt:/", 5) == 0) {
1466 source += 5;
1467 }
1468 return source;
1469 }
1470
1471 void ClassLoader::record_shared_class_loader_type(InstanceKlass* ik, const ClassFileStream* stream) {
1472 assert(DumpSharedSpaces, "sanity");
1473 assert(stream != NULL, "sanity");
1474
1475 if (ik->is_anonymous()) {
1476 // We do not archive anonymous classes.
1477 return;
1478 }
1479
1480 if (stream->source() == NULL) {
1481 if (ik->class_loader() == NULL) {
1482 // JFR classes
1483 ik->set_shared_classpath_index(0);
1484 ik->set_class_loader_type(ClassLoader::BOOT_LOADER);
1485 }
1486 return;
1487 }
1488
1489 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build");
1490
1491 ModuleEntry* module = ik->module();
1492 ClassPathEntry* e = NULL;
1493 int classpath_index = 0;
1494
1495 // Check if the class is from the runtime image
1496 if (module != NULL && (module->location() != NULL) &&
1497 (module->location()->starts_with("jrt:"))) {
1498 e = _jrt_entry;
1499 classpath_index = 0;
1500 } else {
1501 classpath_index = 1;
1502 ResourceMark rm;
1503 char* canonical_path = NEW_RESOURCE_ARRAY(char, JVM_MAXPATHLEN);
1504 for (e = _first_append_entry; e != NULL; e = e->next()) {
1505 if (get_canonical_path(e->name(), canonical_path, JVM_MAXPATHLEN)) {
1506 char* src = (char*)stream->source();
1507 // save the path from the file: protocol or the module name from the jrt: protocol
1508 // if no protocol prefix is found, src is the same as stream->source() after the following call
1509 src = skip_uri_protocol(src);
1510 if (strcmp(canonical_path, os::native_path((char*)src)) == 0) {
1511 break;
1512 }
1513 classpath_index ++;
1514 }
1515 }
1516 if (e == NULL) {
1517 assert(ik->shared_classpath_index() < 0,
1518 "must be a class from a custom jar which isn't in the class path or boot class path");
1519 return;
1520 }
1521 }
1522
1523 if (classpath_index < _num_boot_entries) {
1524 // ik is either:
1525 // 1) a boot class loaded from the runtime image during vm initialization (classpath_index = 0); or
1526 // 2) a user's class from -Xbootclasspath/a (classpath_index > 0)
1527 // In the second case, the classpath_index, classloader_type will be recorded via
1528 // context.record_result() in ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS).
1529 if (classpath_index > 0) {
1530 return;
1531 }
1532 }
1533
1534 ResourceMark rm;
1535 const char* const class_name = ik->name()->as_C_string();
1536 const char* const file_name = file_name_for_class_name(class_name,
1537 ik->name()->utf8_length());
1538 assert(file_name != NULL, "invariant");
1539 Thread* THREAD = Thread::current();
1540 ClassLoaderExt::Context context(class_name, file_name, CATCH);
1541 context.record_result(ik->name(), e, classpath_index, ik, THREAD);
1542 }
1543 #endif // INCLUDE_CDS
1544
1545 // Initialize the class loader's access to methods in libzip. Parse and
1546 // process the boot classpath into a list ClassPathEntry objects. Once
1547 // this list has been created, it must not change order (see class PackageInfo)
1548 // it can be appended to and is by jvmti and the kernel vm.
1549
1550 void ClassLoader::initialize() {
1551 EXCEPTION_MARK;
1552
1553 if (UsePerfData) {
1554 // jvmstat performance counters
1555 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1556 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1557 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1558 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1559 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1560 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1561 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1562 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1563 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1564 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1565
1566 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1567 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1568 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1569 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1570 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1571 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1572 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1573 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1574 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1575 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1576 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1577 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1578 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1579
1580
1581 // The following performance counters are added for measuring the impact
1582 // of the bug fix of 6365597. They are mainly focused on finding out
1583 // the behavior of system & user-defined classloader lock, whether
1584 // ClassLoader.loadClass/findClass is being called synchronized or not.
1585 // Also two additional counters are created to see whether 'UnsyncloadClass'
1586 // flag is being set or not and how many times load_instance_class call
1587 // fails with linkageError etc.
1588 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1589 "systemLoaderLockContentionRate");
1590 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1591 "nonSystemLoaderLockContentionRate");
1592 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1593 "jvmFindLoadedClassNoLockCalls");
1594 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1595 "jvmDefineClassNoLockCalls");
1596
1597 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1598 "jniDefineClassNoLockCalls");
1599
1600 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1601 "unsafeDefineClassCalls");
1602
1603 NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet");
1604 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1605 "loadInstanceClassFailRate");
1606
1607 // increment the isUnsyncloadClass counter if UnsyncloadClass is set.
1608 if (UnsyncloadClass) {
1609 _isUnsyncloadClass->inc();
1610 }
1611 }
1612
1613 // lookup zip library entry points
1614 load_zip_library();
1615 // lookup jimage library entry points
1616 load_jimage_library();
1617 #if INCLUDE_CDS
1618 // initialize search path
1619 if (DumpSharedSpaces) {
1620 _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
1621 }
1622 #endif
1623 setup_bootstrap_search_path();
1624 }
1625
1626 #if INCLUDE_CDS
1627 void ClassLoader::initialize_shared_path() {
1628 if (DumpSharedSpaces) {
1629 _num_boot_entries = _num_entries;
1630 ClassLoaderExt::setup_search_paths();
1631 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1632 }
1633 }
1634 #endif
1635
1636 jlong ClassLoader::classloader_time_ms() {
1637 return UsePerfData ?
1638 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1639 }
1640
1641 jlong ClassLoader::class_init_count() {
1642 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1643 }
1644
1645 jlong ClassLoader::class_init_time_ms() {
1646 return UsePerfData ?
1647 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1648 }
1649
1650 jlong ClassLoader::class_verify_time_ms() {
1651 return UsePerfData ?
1652 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1653 }
1654
1655 jlong ClassLoader::class_link_count() {
1656 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1657 }
1658
1659 jlong ClassLoader::class_link_time_ms() {
1660 return UsePerfData ?
1661 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1662 }
1663
1664 int ClassLoader::compute_Object_vtable() {
1665 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1666 // code to determine actual value from file
1667 // Would be value '11' if finals were in vtable
1668 int JDK_1_2_Object_vtable_size = 5;
1669 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1670 }
1671
1672
1673 void classLoader_init1() {
1674 ClassLoader::initialize();
1675 }
1676
1677 // Complete the ClassPathEntry setup for the boot loader
1678 void ClassLoader::classLoader_init2(TRAPS) {
1679 // Setup the list of module/path pairs for --patch-module processing
1680 // This must be done after the SymbolTable is created in order
1681 // to use fast_compare on module names instead of a string compare.
1682 if (Arguments::get_patch_mod_prefix() != NULL) {
1683 setup_patch_mod_entries();
1684 }
1685
1686 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
1687 // to successfully determine if java.base has been patched)
1688 create_javabase();
1689
1690 // Setup the initial java.base/path pair for the exploded build entries.
1691 // As more modules are defined during module system initialization, more
1692 // entries will be added to the exploded build array.
1693 if (!has_jrt_entry()) {
1694 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds");
1695 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds");
1696 // Set up the boot loader's _exploded_entries list. Note that this gets
1697 // done before loading any classes, by the same thread that will
1698 // subsequently do the first class load. So, no lock is needed for this.
1699 assert(_exploded_entries == NULL, "Should only get initialized once");
1700 _exploded_entries = new (ResourceObj::C_HEAP, mtModule)
1701 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true);
1702 add_to_exploded_build_list(vmSymbols::java_base(), CHECK);
1703 }
1704 }
1705
1706
1707 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1708 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1709 if (CanonicalizeEntry != NULL) {
1710 JavaThread* THREAD = JavaThread::current();
1711 JNIEnv* env = THREAD->jni_environment();
1712 ResourceMark rm(THREAD);
1713
1714 // os::native_path writes into orig_copy
1715 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1716 strcpy(orig_copy, orig);
1717 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1718 return false;
1719 }
1720 } else {
1721 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1722 strncpy(out, orig, len);
1723 out[len - 1] = '\0';
1724 }
1725 return true;
1726 }
1727
1728 void ClassLoader::create_javabase() {
1729 Thread* THREAD = Thread::current();
1730
1731 // Create java.base's module entry for the boot
1732 // class loader prior to loading j.l.Ojbect.
1733 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1734
1735 // Get module entry table
1736 ModuleEntryTable* null_cld_modules = null_cld->modules();
1737 if (null_cld_modules == NULL) {
1738 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1739 }
1740
1741 {
1742 MutexLocker ml(Module_lock, THREAD);
1743 ModuleEntry* jb_module = null_cld_modules->locked_create_entry_or_null(Handle(),
1744 false, vmSymbols::java_base(), NULL, NULL, null_cld);
1745 if (jb_module == NULL) {
1746 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
1747 }
1748 ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1749 }
1750 }
1751
1752 #ifndef PRODUCT
1753
1754 // CompileTheWorld
1755 //
1756 // Iterates over all class path entries and forces compilation of all methods
1757 // in all classes found. Currently, only zip/jar archives are searched.
1758 //
1759 // The classes are loaded by the Java level bootstrap class loader, and the
1760 // initializer is called. If DelayCompilationDuringStartup is true (default),
1761 // the interpreter will run the initialization code. Note that forcing
1762 // initialization in this way could potentially lead to initialization order
1763 // problems, in which case we could just force the initialization bit to be set.
1764
1765
1766 // We need to iterate over the contents of a zip/jar file, so we replicate the
1767 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1768 // since jzfile already has a void* definition.
1769 //
1770 // Note that this is only used in debug mode.
1771 //
1772 // HotSpot integration note:
1773 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1774
1775
1776 // JDK 1.3 version
1777 typedef struct real_jzentry { /* Zip file entry */
1778 char *name; /* entry name */
1779 jint time; /* modification time */
1780 jint size; /* size of uncompressed data */
1781 jint csize; /* size of compressed data (zero if uncompressed) */
1782 jint crc; /* crc of uncompressed data */
1783 char *comment; /* optional zip file comment */
1784 jbyte *extra; /* optional extra data */
1785 jint pos; /* position of LOC header (if negative) or data */
1786 } real_jzentry;
1787
1788 typedef struct real_jzfile { /* Zip file */
1789 char *name; /* zip file name */
1790 jint refs; /* number of active references */
1791 jint fd; /* open file descriptor */
1792 void *lock; /* read lock */
1793 char *comment; /* zip file comment */
1794 char *msg; /* zip error message */
1795 void *entries; /* array of hash cells */
1796 jint total; /* total number of entries */
1797 unsigned short *table; /* Hash chain heads: indexes into entries */
1798 jint tablelen; /* number of hash eads */
1799 real_jzfile *next; /* next zip file in search list */
1800 jzentry *cache; /* we cache the most recently freed jzentry */
1801 /* Information on metadata names in META-INF directory */
1802 char **metanames; /* array of meta names (may have null names) */
1803 jint metacount; /* number of slots in metanames array */
1804 /* If there are any per-entry comments, they are in the comments array */
1805 char **comments;
1806 } real_jzfile;
1807
1808 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1809 // For now we only compile all methods in all classes in zip/jar files
1810 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1811 tty->cr();
1812 }
1813
1814 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1815 real_jzfile* zip = (real_jzfile*) _zip;
1816 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1817 tty->cr();
1818 // Iterate over all entries in zip file
1819 for (int n = 0; ; n++) {
1820 real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n));
1821 if (ze == NULL) break;
1822 ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1823 }
1824 if (HAS_PENDING_EXCEPTION) {
1825 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1826 CLEAR_PENDING_EXCEPTION;
1827 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1828 tty->print_cr("Increase class metadata storage if a limit was set");
1829 } else {
1830 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1831 }
1832 }
1833 }
1834
1835 void ClassLoader::compile_the_world() {
1836 EXCEPTION_MARK;
1837 HandleMark hm(THREAD);
1838 ResourceMark rm(THREAD);
1839
1840 assert(has_jrt_entry(), "Compile The World not supported with exploded module build");
1841
1842 // Find bootstrap loader
1843 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1844 jlong start = os::javaTimeMillis();
1845
1846 // Compile the world for the modular java runtime image
1847 _jrt_entry->compile_the_world(system_class_loader, CATCH);
1848
1849 // Iterate over all bootstrap class path appended entries
1850 ClassPathEntry* e = _first_append_entry;
1851 while (e != NULL) {
1852 assert(!e->is_modules_image(), "A modular java runtime image is present on the list of appended entries");
1853 e->compile_the_world(system_class_loader, CATCH);
1854 e = e->next();
1855 }
1856 jlong end = os::javaTimeMillis();
1857 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1858 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1859 {
1860 // Print statistics as if before normal exit:
1861 extern void print_statistics();
1862 print_statistics();
1863 }
1864 vm_exit(0);
1865 }
1866
1867 int ClassLoader::_compile_the_world_class_counter = 0;
1868 int ClassLoader::_compile_the_world_method_counter = 0;
1869 static int _codecache_sweep_counter = 0;
1870
1871 // Filter out all exceptions except OOMs
1872 static void clear_pending_exception_if_not_oom(TRAPS) {
1873 if (HAS_PENDING_EXCEPTION &&
1874 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1875 CLEAR_PENDING_EXCEPTION;
1876 }
1877 // The CHECK at the caller will propagate the exception out
1878 }
1879
1880 /**
1881 * Returns if the given method should be compiled when doing compile-the-world.
1882 *
1883 * TODO: This should be a private method in a CompileTheWorld class.
1884 */
1885 static bool can_be_compiled(const methodHandle& m, int comp_level) {
1886 assert(CompileTheWorld, "must be");
1887
1888 // It's not valid to compile a native wrapper for MethodHandle methods
1889 // that take a MemberName appendix since the bytecode signature is not
1890 // correct.
1891 vmIntrinsics::ID iid = m->intrinsic_id();
1892 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1893 return false;
1894 }
1895
1896 return CompilationPolicy::can_be_compiled(m, comp_level);
1897 }
1898
1899 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1900 if (string_ends_with(name, ".class")) {
1901 // We have a .class file
1902 int len = (int)strlen(name);
1903 char buffer[2048];
1904 strncpy(buffer, name, len - 6);
1905 buffer[len-6] = 0;
1906 // If the file has a period after removing .class, it's not really a
1907 // valid class file. The class loader will check everything else.
1908 if (strchr(buffer, '.') == NULL) {
1909 _compile_the_world_class_counter++;
1910 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
1911
1912 // Construct name without extension
1913 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
1914 // Use loader to load and initialize class
1915 Klass* k = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
1916 if (k != NULL && !HAS_PENDING_EXCEPTION) {
1917 k->initialize(THREAD);
1918 }
1919 bool exception_occurred = HAS_PENDING_EXCEPTION;
1920 clear_pending_exception_if_not_oom(CHECK);
1921 if (CompileTheWorldPreloadClasses && k != NULL) {
1922 InstanceKlass* ik = InstanceKlass::cast(k);
1923 ConstantPool::preload_and_initialize_all_classes(ik->constants(), THREAD);
1924 if (HAS_PENDING_EXCEPTION) {
1925 // If something went wrong in preloading we just ignore it
1926 clear_pending_exception_if_not_oom(CHECK);
1927 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
1928 }
1929 }
1930
1931 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
1932 if (k == NULL || exception_occurred) {
1933 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
1934 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
1935 } else {
1936 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
1937 // Preload all classes to get around uncommon traps
1938 // Iterate over all methods in class
1939 int comp_level = CompilationPolicy::policy()->initial_compile_level();
1940 InstanceKlass* ik = InstanceKlass::cast(k);
1941 for (int n = 0; n < ik->methods()->length(); n++) {
1942 methodHandle m (THREAD, ik->methods()->at(n));
1943 if (can_be_compiled(m, comp_level)) {
1944 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
1945 // Give sweeper a chance to keep up with CTW
1946 VM_CTWThreshold op;
1947 VMThread::execute(&op);
1948 _codecache_sweep_counter = 0;
1949 }
1950 // Force compilation
1951 CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
1952 methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
1953 if (HAS_PENDING_EXCEPTION) {
1954 clear_pending_exception_if_not_oom(CHECK);
1955 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1956 } else {
1957 _compile_the_world_method_counter++;
1958 }
1959 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
1960 // Clobber the first compile and force second tier compilation
1961 CompiledMethod* nm = m->code();
1962 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1963 // Throw out the code so that the code cache doesn't fill up
1964 nm->make_not_entrant();
1965 }
1966 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
1967 methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
1968 if (HAS_PENDING_EXCEPTION) {
1969 clear_pending_exception_if_not_oom(CHECK);
1970 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1971 } else {
1972 _compile_the_world_method_counter++;
1973 }
1974 }
1975 } else {
1976 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1977 }
1978
1979 CompiledMethod* nm = m->code();
1980 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1981 // Throw out the code so that the code cache doesn't fill up
1982 nm->make_not_entrant();
1983 }
1984 }
1985 }
1986 }
1987 }
1988 }
1989 }
1990
1991 #endif //PRODUCT
1992
1993 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1994 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1995 void PerfClassTraceTime::initialize() {
1996 if (!UsePerfData) return;
1997
1998 if (_eventp != NULL) {
1999 // increment the event counter
2000 _eventp->inc();
2001 }
2002
2003 // stop the current active thread-local timer to measure inclusive time
2004 _prev_active_event = -1;
2005 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
2006 if (_timers[i].is_active()) {
2007 assert(_prev_active_event == -1, "should have only one active timer");
2008 _prev_active_event = i;
2009 _timers[i].stop();
2010 }
2011 }
2012
2013 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
2014 // start the inclusive timer if not recursively called
2015 _t.start();
2016 }
2017
2018 // start thread-local timer of the given event type
2019 if (!_timers[_event_type].is_active()) {
2020 _timers[_event_type].start();
2021 }
2022 }
2023
2024 PerfClassTraceTime::~PerfClassTraceTime() {
2025 if (!UsePerfData) return;
2026
2027 // stop the thread-local timer as the event completes
2028 // and resume the thread-local timer of the event next on the stack
2029 _timers[_event_type].stop();
2030 jlong selftime = _timers[_event_type].ticks();
2031
2032 if (_prev_active_event >= 0) {
2033 _timers[_prev_active_event].start();
2034 }
2035
2036 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
2037
2038 // increment the counters only on the leaf call
2039 _t.stop();
2040 _timep->inc(_t.ticks());
2041 if (_selftimep != NULL) {
2042 _selftimep->inc(selftime);
2043 }
2044 // add all class loading related event selftime to the accumulated time counter
2045 ClassLoader::perf_accumulated_time()->inc(selftime);
2046
2047 // reset the timer
2048 _timers[_event_type].reset();
2049 }