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