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/fprofiler.hpp"
61 #include "runtime/handles.hpp"
62 #include "runtime/handles.inline.hpp"
63 #include "runtime/init.hpp"
64 #include "runtime/interfaceSupport.hpp"
65 #include "runtime/java.hpp"
66 #include "runtime/javaCalls.hpp"
67 #include "runtime/os.hpp"
68 #include "runtime/threadCritical.hpp"
69 #include "runtime/timer.hpp"
70 #include "runtime/vm_version.hpp"
71 #include "services/management.hpp"
72 #include "services/threadService.hpp"
73 #include "utilities/events.hpp"
74 #include "utilities/hashtable.inline.hpp"
75 #include "utilities/macros.hpp"
76 #if INCLUDE_CDS
77 #include "classfile/sharedClassUtil.hpp"
78 #include "classfile/sharedPathsMiscInfo.hpp"
79 #endif
80
81 // Entry points in zip.dll for loading zip/jar file entries
82
83 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg);
84 typedef void (JNICALL *ZipClose_t)(jzfile *zip);
85 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
86 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
87 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n);
88 typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg);
89 typedef jint (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len);
90
91 static ZipOpen_t ZipOpen = NULL;
92 static ZipClose_t ZipClose = NULL;
93 static FindEntry_t FindEntry = NULL;
94 static ReadEntry_t ReadEntry = NULL;
95 static GetNextEntry_t GetNextEntry = NULL;
96 static canonicalize_fn_t CanonicalizeEntry = NULL;
97 static ZipInflateFully_t ZipInflateFully = NULL;
98 static Crc32_t Crc32 = NULL;
99
100 // Entry points for jimage.dll for loading jimage file entries
101
102 static JImageOpen_t JImageOpen = NULL;
103 static JImageClose_t JImageClose = NULL;
104 static JImagePackageToModule_t JImagePackageToModule = NULL;
105 static JImageFindResource_t JImageFindResource = NULL;
106 static JImageGetResource_t JImageGetResource = NULL;
107 static JImageResourceIterator_t JImageResourceIterator = NULL;
108 static JImage_ResourcePath_t JImageResourcePath = NULL;
109
110 // Globals
111
112 PerfCounter* ClassLoader::_perf_accumulated_time = NULL;
113 PerfCounter* ClassLoader::_perf_classes_inited = NULL;
114 PerfCounter* ClassLoader::_perf_class_init_time = NULL;
115 PerfCounter* ClassLoader::_perf_class_init_selftime = NULL;
116 PerfCounter* ClassLoader::_perf_classes_verified = NULL;
117 PerfCounter* ClassLoader::_perf_class_verify_time = NULL;
118 PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL;
119 PerfCounter* ClassLoader::_perf_classes_linked = NULL;
120 PerfCounter* ClassLoader::_perf_class_link_time = NULL;
121 PerfCounter* ClassLoader::_perf_class_link_selftime = NULL;
122 PerfCounter* ClassLoader::_perf_class_parse_time = NULL;
123 PerfCounter* ClassLoader::_perf_class_parse_selftime = NULL;
124 PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL;
125 PerfCounter* ClassLoader::_perf_shared_classload_time = NULL;
126 PerfCounter* ClassLoader::_perf_sys_classload_time = NULL;
127 PerfCounter* ClassLoader::_perf_app_classload_time = NULL;
128 PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL;
129 PerfCounter* ClassLoader::_perf_app_classload_count = NULL;
130 PerfCounter* ClassLoader::_perf_define_appclasses = NULL;
131 PerfCounter* ClassLoader::_perf_define_appclass_time = NULL;
132 PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL;
133 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL;
134 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL;
135 PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
136 PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
137 PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
138 PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
139 PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
140 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL;
141 PerfCounter* ClassLoader::_isUnsyncloadClass = NULL;
142 PerfCounter* ClassLoader::_load_instance_class_failCounter = NULL;
143
144 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = NULL;
145 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = NULL;
146 ClassPathEntry* ClassLoader::_jrt_entry = NULL;
147 ClassPathEntry* ClassLoader::_first_append_entry = NULL;
148 ClassPathEntry* ClassLoader::_last_append_entry = NULL;
149 int ClassLoader::_num_entries = 0;
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 static PackageEntry* get_package_entry(const char* class_name, ClassLoaderData* loader_data, TRAPS) {
246 ResourceMark rm(THREAD);
247 const char *pkg_name = ClassLoader::package_from_name(class_name);
248 if (pkg_name == NULL) {
249 return NULL;
250 }
251 PackageEntryTable* pkgEntryTable = loader_data->packages();
252 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(pkg_name, CHECK_NULL);
253 return pkgEntryTable->lookup_only(pkg_symbol);
254 }
255
256 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() {
257 char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
258 strcpy(copy, dir);
259 _dir = copy;
260 }
261
262
263 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
264 // construct full path name
265 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
266 if (jio_snprintf(path, JVM_MAXPATHLEN, "%s%s%s", _dir, os::file_separator(), name) == -1) {
267 FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN);
268 return NULL;
269 }
270 // check if file exists
271 struct stat st;
272 if (os::stat(path, &st) == 0) {
273 #if INCLUDE_CDS
274 if (DumpSharedSpaces) {
275 // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so
276 // we should never find a file underneath it -- unless user has added a new file while we are running
277 // the dump, in which case let's quit!
278 ShouldNotReachHere();
279 }
280 #endif
281 // found file, open it
282 int file_handle = os::open(path, 0, 0);
283 if (file_handle != -1) {
284 // read contents into resource array
285 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
286 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
287 // close file
288 os::close(file_handle);
289 // construct ClassFileStream
290 if (num_read == (size_t)st.st_size) {
291 if (UsePerfData) {
292 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
293 }
294 FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN);
295 // Resource allocated
296 return new ClassFileStream(buffer,
297 st.st_size,
298 _dir,
299 ClassFileStream::verify);
300 }
301 }
302 }
303 FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN);
304 return NULL;
305 }
306
307 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name, bool is_boot_append) : ClassPathEntry() {
308 _zip = zip;
309 char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
310 strcpy(copy, zip_name);
311 _zip_name = copy;
312 _is_boot_append = is_boot_append;
313 _multi_versioned = _unknown;
314 }
315
316 ClassPathZipEntry::~ClassPathZipEntry() {
317 if (ZipClose != NULL) {
318 (*ZipClose)(_zip);
319 }
320 FREE_C_HEAP_ARRAY(char, _zip_name);
321 }
322
323 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 char* entry_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
385 if (version > 0) {
386 n = jio_snprintf(entry_name, JVM_MAXPATHLEN, "META-INF/versions/%d/%s", version, name);
387 entry_name[n] = '\0';
388 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
389 if (buffer == NULL) {
390 warning("Could not find %s in %s, try to find highest version instead", entry_name, _zip_name);
391 }
392 }
393 if (buffer == NULL) {
394 for (int i = cur_ver; i >= base_version; i--) {
395 n = jio_snprintf(entry_name, JVM_MAXPATHLEN, "META-INF/versions/%d/%s", i, name);
396 entry_name[n] = '\0';
397 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
398 if (buffer != NULL) {
399 break;
400 }
401 }
402 }
403 FREE_RESOURCE_ARRAY(char, entry_name, JVM_MAXPATHLEN);
404 }
405 }
406 return buffer;
407 }
408
409 bool ClassPathZipEntry::is_multiple_versioned(TRAPS) {
410 assert(DumpSharedSpaces, "called only at dump time");
411 if (_multi_versioned != _unknown) {
412 return (_multi_versioned == _yes) ? true : false;
413 }
414 jint size;
415 char* buffer = (char*)open_entry("META-INF/MANIFEST.MF", &size, true, CHECK_false);
416 if (buffer != NULL) {
417 char* p = buffer;
418 for ( ; *p; ++p) *p = tolower(*p);
419 if (strstr(buffer, "multi-release: true") != NULL) {
420 _multi_versioned = _yes;
421 return true;
422 }
423 }
424 _multi_versioned = _no;
425 return false;
426 }
427 #endif // INCLUDE_CDS
428
429 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
430 jint filesize;
431 u1* buffer = open_versioned_entry(name, &filesize, CHECK_NULL);
432 if (buffer == NULL) {
433 buffer = open_entry(name, &filesize, false, CHECK_NULL);
434 if (buffer == NULL) {
435 return NULL;
436 }
437 }
438 if (UsePerfData) {
439 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
440 }
441 // Resource allocated
442 return new ClassFileStream(buffer,
443 filesize,
444 _zip_name,
445 ClassFileStream::verify);
446 }
447
448 // invoke function for each entry in the zip file
449 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
450 JavaThread* thread = JavaThread::current();
451 HandleMark handle_mark(thread);
452 ThreadToNativeFromVM ttn(thread);
453 for (int n = 0; ; n++) {
454 jzentry * ze = ((*GetNextEntry)(_zip, n));
455 if (ze == NULL) break;
456 (*f)(ze->name, context);
457 }
458 }
459
460 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
461 ClassPathEntry(),
462 _jimage(jimage) {
463 guarantee(jimage != NULL, "jimage file is null");
464 guarantee(name != NULL, "jimage file name is null");
465 size_t len = strlen(name) + 1;
466 _name = NEW_C_HEAP_ARRAY(const char, len, mtClass);
467 strncpy((char *)_name, name, len);
468 }
469
470 ClassPathImageEntry::~ClassPathImageEntry() {
471 if (_name != NULL) {
472 FREE_C_HEAP_ARRAY(const char, _name);
473 _name = NULL;
474 }
475 if (_jimage != NULL) {
476 (*JImageClose)(_jimage);
477 _jimage = NULL;
478 }
479 }
480
481 // For a class in a named module, look it up in the jimage file using this syntax:
482 // /<module-name>/<package-name>/<base-class>
483 //
484 // Assumptions:
485 // 1. There are no unnamed modules in the jimage file.
486 // 2. A package is in at most one module in the jimage file.
487 //
488 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
489 jlong size;
490 JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size);
491
492 if (location == 0) {
493 ResourceMark rm;
494 const char* pkg_name = ClassLoader::package_from_name(name);
495
496 if (pkg_name != NULL) {
497 if (!Universe::is_module_initialized()) {
498 location = (*JImageFindResource)(_jimage, JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
499 #if INCLUDE_CDS
500 // CDS uses the boot class loader to load classes whose packages are in
501 // modules defined for other class loaders. So, for now, get their module
502 // names from the "modules" jimage file.
503 if (DumpSharedSpaces && location == 0) {
504 const char* module_name = (*JImagePackageToModule)(_jimage, pkg_name);
505 if (module_name != NULL) {
506 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
507 }
508 }
509 #endif
510
511 } else {
512 PackageEntry* package_entry = get_package_entry(name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
513 if (package_entry != NULL) {
514 ResourceMark rm;
515 // Get the module name
516 ModuleEntry* module = package_entry->module();
517 assert(module != NULL, "Boot classLoader package missing module");
518 assert(module->is_named(), "Boot classLoader package is in unnamed module");
519 const char* module_name = module->name()->as_C_string();
520 if (module_name != NULL) {
521 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
522 }
523 }
524 }
525 }
526 }
527 if (location != 0) {
528 if (UsePerfData) {
529 ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
530 }
531 char* data = NEW_RESOURCE_ARRAY(char, size);
532 (*JImageGetResource)(_jimage, location, data, size);
533 // Resource allocated
534 return new ClassFileStream((u1*)data,
535 (int)size,
536 _name,
537 ClassFileStream::verify);
538 }
539
540 return NULL;
541 }
542
543 #ifndef PRODUCT
544 bool ctw_visitor(JImageFile* jimage,
545 const char* module_name, const char* version, const char* package,
546 const char* name, const char* extension, void* arg) {
547 if (strcmp(extension, "class") == 0) {
548 Thread* THREAD = Thread::current();
549 ResourceMark rm(THREAD);
550 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JIMAGE_MAX_PATH);
551 jio_snprintf(path, JIMAGE_MAX_PATH - 1, "%s/%s.class", package, name);
552 ClassLoader::compile_the_world_in(path, *(Handle*)arg, THREAD);
553 return !HAS_PENDING_EXCEPTION;
554 }
555 return true;
556 }
557
558 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) {
559 tty->print_cr("CompileTheWorld : Compiling all classes in %s", name());
560 tty->cr();
561 (*JImageResourceIterator)(_jimage, (JImageResourceVisitor_t)ctw_visitor, (void *)&loader);
562 if (HAS_PENDING_EXCEPTION) {
563 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
564 CLEAR_PENDING_EXCEPTION;
565 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
566 tty->print_cr("Increase class metadata storage if a limit was set");
567 } else {
568 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
569 }
570 }
571 }
572 #endif
573
574 bool ClassPathImageEntry::is_jrt() {
575 return ClassLoader::is_jrt(name());
576 }
577
578 #if INCLUDE_CDS
579 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
580 assert(DumpSharedSpaces, "only called at dump time");
581 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure");
582 vm_exit_during_initialization(error, message);
583 }
584 #endif
585
586 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
587 _module_name = module_name;
588 _module_first_entry = NULL;
589 _module_last_entry = NULL;
590 }
591
592 ModuleClassPathList::~ModuleClassPathList() {
593 // Clean out each ClassPathEntry on list
594 ClassPathEntry* e = _module_first_entry;
595 while (e != NULL) {
596 ClassPathEntry* next_entry = e->next();
597 delete e;
598 e = next_entry;
599 }
600 }
601
602 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
603 if (new_entry != NULL) {
604 if (_module_last_entry == NULL) {
605 _module_first_entry = _module_last_entry = new_entry;
606 } else {
607 _module_last_entry->set_next(new_entry);
608 _module_last_entry = new_entry;
609 }
610 }
611 }
612
613 void ClassLoader::trace_class_path(const char* msg, const char* name) {
614 LogTarget(Info, class, path) lt;
615 if (lt.is_enabled()) {
616 LogStream ls(lt);
617 if (msg) {
618 ls.print("%s", msg);
619 }
620 if (name) {
621 if (strlen(name) < 256) {
622 ls.print("%s", name);
623 } else {
624 // For very long paths, we need to print each character separately,
625 // as print_cr() has a length limit
626 while (name[0] != '\0') {
627 ls.print("%c", name[0]);
628 name++;
629 }
630 }
631 }
632 ls.cr();
633 }
634 }
635
636 #if INCLUDE_CDS
637 void ClassLoader::check_shared_classpath(const char *path) {
638 if (strcmp(path, "") == 0) {
639 exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
640 }
641
642 struct stat st;
643 if (os::stat(path, &st) == 0) {
644 if ((st.st_mode & S_IFMT) != S_IFREG) { // is not a regular file
645 if (!os::dir_is_empty(path)) {
646 tty->print_cr("Error: non-empty directory '%s'", path);
647 exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL);
648 }
649 }
650 }
651 }
652 #endif
653
654 void ClassLoader::setup_bootstrap_search_path() {
655 const char* sys_class_path = Arguments::get_sysclasspath();
656 const char* java_class_path = Arguments::get_appclasspath();
657 if (PrintSharedArchiveAndExit) {
658 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
659 // the same as the bootcp of the shared archive.
660 } else {
661 trace_class_path("bootstrap loader class path=", sys_class_path);
662 trace_class_path("classpath: ", java_class_path);
663 }
664 #if INCLUDE_CDS
665 if (DumpSharedSpaces) {
666 _shared_paths_misc_info->add_boot_classpath(sys_class_path);
667 }
668 #endif
669 setup_search_path(sys_class_path, true);
670 }
671
672 #if INCLUDE_CDS
673 int ClassLoader::get_shared_paths_misc_info_size() {
674 return _shared_paths_misc_info->get_used_bytes();
675 }
676
677 void* ClassLoader::get_shared_paths_misc_info() {
678 return _shared_paths_misc_info->buffer();
679 }
680
681 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
682 SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
683 bool result = checker->check();
684 delete checker;
685 return result;
686 }
687 #endif
688
689 // Construct the array of module/path pairs as specified to --patch-module
690 // for the boot loader to search ahead of the jimage, if the class being
691 // loaded is defined to a module that has been specified to --patch-module.
692 void ClassLoader::setup_patch_mod_entries() {
693 Thread* THREAD = Thread::current();
694 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
695 int num_of_entries = patch_mod_args->length();
696
697
698 // Set up the boot loader's _patch_mod_entries list
699 _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true);
700
701 for (int i = 0; i < num_of_entries; i++) {
702 const char* module_name = (patch_mod_args->at(i))->module_name();
703 Symbol* const module_sym = SymbolTable::lookup(module_name, (int)strlen(module_name), CHECK);
704 assert(module_sym != NULL, "Failed to obtain Symbol for module name");
705 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
706
707 char* class_path = (patch_mod_args->at(i))->path_string();
708 int len = (int)strlen(class_path);
709 int end = 0;
710 // Iterate over the module's class path entries
711 for (int start = 0; start < len; start = end) {
712 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
713 end++;
714 }
715 EXCEPTION_MARK;
716 ResourceMark rm(THREAD);
717 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
718 strncpy(path, &class_path[start], end - start);
719 path[end - start] = '\0';
720
721 struct stat st;
722 if (os::stat(path, &st) == 0) {
723 // File or directory found
724 Thread* THREAD = Thread::current();
725 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
726 // If the path specification is valid, enter it into this module's list
727 if (new_entry != NULL) {
728 module_cpl->add_to_list(new_entry);
729 }
730 }
731
732 while (class_path[end] == os::path_separator()[0]) {
733 end++;
734 }
735 }
736
737 // Record the module into the list of --patch-module entries only if
738 // valid ClassPathEntrys have been created
739 if (module_cpl->module_first_entry() != NULL) {
740 _patch_mod_entries->push(module_cpl);
741 }
742 }
743 }
744
745 // Determine whether the module has been patched via the command-line
746 // option --patch-module
747 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
748 if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) {
749 int table_len = _patch_mod_entries->length();
750 for (int i = 0; i < table_len; i++) {
751 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
752 if (module_name->fast_compare(patch_mod->module_name()) == 0) {
753 return true;
754 }
755 }
756 }
757 return false;
758 }
759
760 void ClassLoader::setup_search_path(const char *class_path, bool bootstrap_search) {
761 int len = (int)strlen(class_path);
762 int end = 0;
763 bool set_base_piece = bootstrap_search;
764
765 // Iterate over class path entries
766 for (int start = 0; start < len; start = end) {
767 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
768 end++;
769 }
770 EXCEPTION_MARK;
771 ResourceMark rm(THREAD);
772 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
773 strncpy(path, &class_path[start], end - start);
774 path[end - start] = '\0';
775
776 // The first time through the bootstrap_search setup, it must be determined
777 // what the base or core piece of the boot loader search is. Either a java runtime
778 // image is present or this is an exploded module build situation.
779 if (set_base_piece) {
780 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
781 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
782 struct stat st;
783 if (os::stat(path, &st) == 0) {
784 // Directory found
785 Thread* THREAD = Thread::current();
786 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
787
788 // Check for a jimage
789 if (Arguments::has_jimage()) {
790 assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice");
791 assert(new_entry != NULL && new_entry->is_jrt(), "No java runtime image present");
792 _jrt_entry = new_entry;
793 ++_num_entries;
794 #if INCLUDE_CDS
795 if (DumpSharedSpaces) {
796 JImageFile *jimage = _jrt_entry->jimage();
797 assert(jimage != NULL, "No java runtime image file present");
798 ClassLoader::initialize_module_loader_map(jimage);
799 }
800 #endif
801 }
802 } else {
803 // If path does not exist, exit
804 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
805 }
806 set_base_piece = false;
807 } else {
808 // Every entry on the system boot class path after the initial base piece,
809 // which is set by os::set_boot_path(), is considered an appended entry.
810 update_class_path_entry_list(path, false, bootstrap_search);
811 }
812
813 #if INCLUDE_CDS
814 if (DumpSharedSpaces) {
815 check_shared_classpath(path);
816 }
817 #endif
818 while (class_path[end] == os::path_separator()[0]) {
819 end++;
820 }
821 }
822 }
823
824 // During an exploded modules build, each module defined to the boot loader
825 // will be added to the ClassLoader::_exploded_entries array.
826 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) {
827 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
828 assert(_exploded_entries != NULL, "_exploded_entries was not initialized");
829
830 // Find the module's symbol
831 ResourceMark rm(THREAD);
832 const char *module_name = module_sym->as_C_string();
833 const char *home = Arguments::get_java_home();
834 const char file_sep = os::file_separator()[0];
835 // 10 represents the length of "modules" + 2 file separators + \0
836 size_t len = strlen(home) + strlen(module_name) + 10;
837 char *path = NEW_C_HEAP_ARRAY(char, len, mtModule);
838 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
839
840 struct stat st;
841 if (os::stat(path, &st) == 0) {
842 // Directory found
843 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
844
845 // If the path specification is valid, enter it into this module's list.
846 // There is no need to check for duplicate modules in the exploded entry list,
847 // since no two modules with the same name can be defined to the boot loader.
848 // This is checked at module definition time in Modules::define_module.
849 if (new_entry != NULL) {
850 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
851 module_cpl->add_to_list(new_entry);
852 {
853 MutexLocker ml(Module_lock, THREAD);
854 _exploded_entries->push(module_cpl);
855 }
856 log_info(class, load)("path: %s", path);
857 }
858 }
859 FREE_C_HEAP_ARRAY(char, path);
860 }
861
862 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
863 bool throw_exception,
864 bool is_boot_append, TRAPS) {
865 JavaThread* thread = JavaThread::current();
866 ClassPathEntry* new_entry = NULL;
867 if ((st->st_mode & S_IFMT) == S_IFREG) {
868 ResourceMark rm(thread);
869 // Regular file, should be a zip or jimage file
870 // Canonicalized filename
871 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
872 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
873 // This matches the classic VM
874 if (throw_exception) {
875 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
876 } else {
877 return NULL;
878 }
879 }
880 jint error;
881 JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
882 if (jimage != NULL) {
883 new_entry = new ClassPathImageEntry(jimage, canonical_path);
884 } else {
885 char* error_msg = NULL;
886 jzfile* zip;
887 {
888 // enable call to C land
889 ThreadToNativeFromVM ttn(thread);
890 HandleMark hm(thread);
891 zip = (*ZipOpen)(canonical_path, &error_msg);
892 }
893 if (zip != NULL && error_msg == NULL) {
894 new_entry = new ClassPathZipEntry(zip, path, is_boot_append);
895 } else {
896 char *msg;
897 if (error_msg == NULL) {
898 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ;
899 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
900 } else {
901 int len = (int)(strlen(path) + strlen(error_msg) + 128);
902 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ;
903 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
904 }
905 // Don't complain about bad jar files added via -Xbootclasspath/a:.
906 if (throw_exception && is_init_completed()) {
907 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
908 } else {
909 return NULL;
910 }
911 }
912 }
913 log_info(class, path)("opened: %s", path);
914 log_info(class, load)("opened: %s", path);
915 } else {
916 // Directory
917 new_entry = new ClassPathDirEntry(path);
918 log_info(class, load)("path: %s", path);
919 }
920 return new_entry;
921 }
922
923
924 // Create a class path zip entry for a given path (return NULL if not found
925 // or zip/JAR file cannot be opened)
926 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
927 // check for a regular file
928 struct stat st;
929 if (os::stat(path, &st) == 0) {
930 if ((st.st_mode & S_IFMT) == S_IFREG) {
931 char canonical_path[JVM_MAXPATHLEN];
932 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
933 char* error_msg = NULL;
934 jzfile* zip;
935 {
936 // enable call to C land
937 JavaThread* thread = JavaThread::current();
938 ThreadToNativeFromVM ttn(thread);
939 HandleMark hm(thread);
940 zip = (*ZipOpen)(canonical_path, &error_msg);
941 }
942 if (zip != NULL && error_msg == NULL) {
943 // create using canonical path
944 return new ClassPathZipEntry(zip, canonical_path, is_boot_append);
945 }
946 }
947 }
948 }
949 return NULL;
950 }
951
952 // returns true if entry already on class path
953 bool ClassLoader::contains_append_entry(const char* name) {
954 ClassPathEntry* e = _first_append_entry;
955 while (e != NULL) {
956 // assume zip entries have been canonicalized
957 if (strcmp(name, e->name()) == 0) {
958 return true;
959 }
960 e = e->next();
961 }
962 return false;
963 }
964
965 void ClassLoader::add_to_list(ClassPathEntry *new_entry) {
966 if (new_entry != NULL) {
967 if (_last_append_entry == NULL) {
968 assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty");
969 _first_append_entry = _last_append_entry = new_entry;
970 } else {
971 _last_append_entry->set_next(new_entry);
972 _last_append_entry = new_entry;
973 }
974 }
975 _num_entries++;
976 }
977
978 void ClassLoader::add_to_list(const char *apath) {
979 update_class_path_entry_list((char*)apath, false, false);
980 }
981
982 // Returns true IFF the file/dir exists and the entry was successfully created.
983 bool ClassLoader::update_class_path_entry_list(const char *path,
984 bool check_for_duplicates,
985 bool is_boot_append,
986 bool throw_exception) {
987 struct stat st;
988 if (os::stat(path, &st) == 0) {
989 // File or directory found
990 ClassPathEntry* new_entry = NULL;
991 Thread* THREAD = Thread::current();
992 new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false));
993 if (new_entry == NULL) {
994 return false;
995 }
996
997 // Do not reorder the bootclasspath which would break get_system_package().
998 // Add new entry to linked list
999 if (!check_for_duplicates || !contains_append_entry(new_entry->name())) {
1000 ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry);
1001 }
1002 return true;
1003 } else {
1004 #if INCLUDE_CDS
1005 if (DumpSharedSpaces) {
1006 _shared_paths_misc_info->add_nonexist_path(path);
1007 }
1008 #endif
1009 return false;
1010 }
1011 }
1012
1013 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
1014 ResourceMark rm;
1015 int num_of_entries = module_list->length();
1016 for (int i = 0; i < num_of_entries; i++) {
1017 ClassPathEntry* e;
1018 ModuleClassPathList* mpl = module_list->at(i);
1019 tty->print("%s=", mpl->module_name()->as_C_string());
1020 e = mpl->module_first_entry();
1021 while (e != NULL) {
1022 tty->print("%s", e->name());
1023 e = e->next();
1024 if (e != NULL) {
1025 tty->print("%s", os::path_separator());
1026 }
1027 }
1028 tty->print(" ;");
1029 }
1030 }
1031
1032 void ClassLoader::print_bootclasspath() {
1033 ClassPathEntry* e;
1034 tty->print("[bootclasspath= ");
1035
1036 // Print --patch-module module/path specifications first
1037 if (_patch_mod_entries != NULL) {
1038 print_module_entry_table(_patch_mod_entries);
1039 }
1040
1041 // [jimage | exploded modules build]
1042 if (has_jrt_entry()) {
1043 // Print the location of the java runtime image
1044 tty->print("%s ;", _jrt_entry->name());
1045 } else {
1046 // Print exploded module build path specifications
1047 if (_exploded_entries != NULL) {
1048 print_module_entry_table(_exploded_entries);
1049 }
1050 }
1051
1052 // appended entries
1053 e = _first_append_entry;
1054 while (e != NULL) {
1055 tty->print("%s ;", e->name());
1056 e = e->next();
1057 }
1058 tty->print_cr("]");
1059 }
1060
1061 void ClassLoader::load_zip_library() {
1062 assert(ZipOpen == NULL, "should not load zip library twice");
1063 // First make sure native library is loaded
1064 os::native_java_library();
1065 // Load zip library
1066 char path[JVM_MAXPATHLEN];
1067 char ebuf[1024];
1068 void* handle = NULL;
1069 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
1070 handle = os::dll_load(path, ebuf, sizeof ebuf);
1071 }
1072 if (handle == NULL) {
1073 vm_exit_during_initialization("Unable to load ZIP library", path);
1074 }
1075 // Lookup zip entry points
1076 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
1077 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
1078 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
1079 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
1080 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
1081 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
1082 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
1083
1084 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
1085 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
1086 GetNextEntry == NULL || Crc32 == NULL) {
1087 vm_exit_during_initialization("Corrupted ZIP library", path);
1088 }
1089
1090 if (ZipInflateFully == NULL) {
1091 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
1092 }
1093
1094 // Lookup canonicalize entry in libjava.dll
1095 void *javalib_handle = os::native_java_library();
1096 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
1097 // This lookup only works on 1.3. Do not check for non-null here
1098 }
1099
1100 void ClassLoader::load_jimage_library() {
1101 // First make sure native library is loaded
1102 os::native_java_library();
1103 // Load jimage library
1104 char path[JVM_MAXPATHLEN];
1105 char ebuf[1024];
1106 void* handle = NULL;
1107 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
1108 handle = os::dll_load(path, ebuf, sizeof ebuf);
1109 }
1110 if (handle == NULL) {
1111 vm_exit_during_initialization("Unable to load jimage library", path);
1112 }
1113
1114 // Lookup jimage entry points
1115 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open"));
1116 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found");
1117 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close"));
1118 guarantee(JImageClose != NULL, "function JIMAGE_Close not found");
1119 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule"));
1120 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found");
1121 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource"));
1122 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found");
1123 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource"));
1124 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found");
1125 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator"));
1126 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found");
1127 JImageResourcePath = CAST_TO_FN_PTR(JImage_ResourcePath_t, os::dll_lookup(handle, "JIMAGE_ResourcePath"));
1128 guarantee(JImageResourcePath != NULL, "function JIMAGE_ResourcePath not found");
1129 }
1130
1131 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
1132 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
1133 }
1134
1135 int ClassLoader::crc32(int crc, const char* buf, int len) {
1136 assert(Crc32 != NULL, "ZIP_CRC32 is not found");
1137 return (*Crc32)(crc, (const jbyte*)buf, len);
1138 }
1139
1140 #if INCLUDE_CDS
1141 void ClassLoader::initialize_module_loader_map(JImageFile* jimage) {
1142 if (!DumpSharedSpaces) {
1143 return; // only needed for CDS dump time
1144 }
1145
1146 ResourceMark rm;
1147 jlong size;
1148 JImageLocationRef location = (*JImageFindResource)(jimage, JAVA_BASE_NAME, get_jimage_version_string(), MODULE_LOADER_MAP, &size);
1149 if (location == 0) {
1150 vm_exit_during_initialization(
1151 "Cannot find ModuleLoaderMap location from modules jimage.", NULL);
1152 }
1153 char* buffer = NEW_RESOURCE_ARRAY(char, size + 1);
1154 buffer[size] = '\0';
1155 jlong read = (*JImageGetResource)(jimage, location, buffer, size);
1156 if (read != size) {
1157 vm_exit_during_initialization(
1158 "Cannot find ModuleLoaderMap resource from modules jimage.", NULL);
1159 }
1160 char* char_buf = (char*)buffer;
1161 int buflen = (int)strlen(char_buf);
1162 char* begin_ptr = char_buf;
1163 char* end_ptr = strchr(begin_ptr, '\n');
1164 bool process_boot_modules = false;
1165 _boot_modules_array = new (ResourceObj::C_HEAP, mtModule)
1166 GrowableArray<char*>(INITIAL_BOOT_MODULES_ARRAY_SIZE, true);
1167 _platform_modules_array = new (ResourceObj::C_HEAP, mtModule)
1168 GrowableArray<char*>(INITIAL_PLATFORM_MODULES_ARRAY_SIZE, true);
1169 while (end_ptr != NULL && (end_ptr - char_buf) < buflen) {
1170 // Allocate a buffer from the C heap to be appended to the _boot_modules_array
1171 // or the _platform_modules_array.
1172 char* temp_name = NEW_C_HEAP_ARRAY(char, (size_t)(end_ptr - begin_ptr + 1), mtInternal);
1173 strncpy(temp_name, begin_ptr, end_ptr - begin_ptr);
1174 temp_name[end_ptr - begin_ptr] = '\0';
1175 if (strncmp(temp_name, "BOOT", 4) == 0) {
1176 process_boot_modules = true;
1177 FREE_C_HEAP_ARRAY(char, temp_name);
1178 } else if (strncmp(temp_name, "PLATFORM", 8) == 0) {
1179 process_boot_modules = false;
1180 FREE_C_HEAP_ARRAY(char, temp_name);
1181 } else {
1182 // module name
1183 if (process_boot_modules) {
1184 _boot_modules_array->append(temp_name);
1185 } else {
1186 _platform_modules_array->append(temp_name);
1187 }
1188 }
1189 begin_ptr = ++end_ptr;
1190 end_ptr = strchr(begin_ptr, '\n');
1191 }
1192 }
1193 #endif
1194
1195 // Function add_package extracts the package from the fully qualified class name
1196 // and checks if the package is in the boot loader's package entry table. If so,
1197 // then it sets the classpath_index in the package entry record.
1198 //
1199 // The classpath_index field is used to find the entry on the boot loader class
1200 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
1201 // in an unnamed module. It is also used to indicate (for all packages whose
1202 // classes are loaded by the boot loader) that at least one of the package's
1203 // classes has been loaded.
1204 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) {
1205 assert(fullq_class_name != NULL, "just checking");
1206
1207 // Get package name from fully qualified class name.
1208 ResourceMark rm;
1209 const char *cp = package_from_name(fullq_class_name);
1210 if (cp != NULL) {
1211 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();
1212 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp, CHECK_false);
1213 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol);
1214 if (pkg_entry != NULL) {
1215 assert(classpath_index != -1, "Unexpected classpath_index");
1216 pkg_entry->set_classpath_index(classpath_index);
1217 } else {
1218 return false;
1219 }
1220 }
1221 return true;
1222 }
1223
1224 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1225 // Look up the name in the boot loader's package entry table.
1226 if (name != NULL) {
1227 TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL);
1228 // Look for the package entry in the boot loader's package entry table.
1229 PackageEntry* package =
1230 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1231
1232 // Return NULL if package does not exist or if no classes in that package
1233 // have been loaded.
1234 if (package != NULL && package->has_loaded_class()) {
1235 ModuleEntry* module = package->module();
1236 if (module->location() != NULL) {
1237 ResourceMark rm(THREAD);
1238 Handle ml = java_lang_String::create_from_str(
1239 module->location()->as_C_string(), THREAD);
1240 return ml();
1241 }
1242 // Return entry on boot loader class path.
1243 Handle cph = java_lang_String::create_from_str(
1244 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1245 return cph();
1246 }
1247 }
1248 return NULL;
1249 }
1250
1251 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1252 ResourceMark rm(THREAD);
1253 // List of pointers to PackageEntrys that have loaded classes.
1254 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
1255 {
1256 MutexLocker ml(Module_lock, THREAD);
1257
1258 PackageEntryTable* pe_table =
1259 ClassLoaderData::the_null_class_loader_data()->packages();
1260
1261 // Collect the packages that have at least one loaded class.
1262 for (int x = 0; x < pe_table->table_size(); x++) {
1263 for (PackageEntry* package_entry = pe_table->bucket(x);
1264 package_entry != NULL;
1265 package_entry = package_entry->next()) {
1266 if (package_entry->has_loaded_class()) {
1267 loaded_class_pkgs->append(package_entry);
1268 }
1269 }
1270 }
1271 }
1272
1273
1274 // Allocate objArray and fill with java.lang.String
1275 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1276 loaded_class_pkgs->length(), CHECK_NULL);
1277 objArrayHandle result(THREAD, r);
1278 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1279 PackageEntry* package_entry = loaded_class_pkgs->at(x);
1280 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1281 result->obj_at_put(x, str());
1282 }
1283 return result();
1284 }
1285
1286 #if INCLUDE_CDS
1287 s2 ClassLoader::module_to_classloader(const char* module_name) {
1288
1289 assert(DumpSharedSpaces, "dump time only");
1290 assert(_boot_modules_array != NULL, "_boot_modules_array is NULL");
1291 assert(_platform_modules_array != NULL, "_platform_modules_array is NULL");
1292
1293 int array_size = _boot_modules_array->length();
1294 for (int i = 0; i < array_size; i++) {
1295 if (strcmp(module_name, _boot_modules_array->at(i)) == 0) {
1296 return BOOT_LOADER;
1297 }
1298 }
1299
1300 array_size = _platform_modules_array->length();
1301 for (int i = 0; i < array_size; i++) {
1302 if (strcmp(module_name, _platform_modules_array->at(i)) == 0) {
1303 return PLATFORM_LOADER;
1304 }
1305 }
1306
1307 return APP_LOADER;
1308 }
1309
1310 s2 ClassLoader::classloader_type(Symbol* class_name, ClassPathEntry* e, int classpath_index, TRAPS) {
1311 assert(DumpSharedSpaces, "Only used for CDS dump time");
1312
1313 // obtain the classloader type based on the class name.
1314 // First obtain the package name based on the class name. Then obtain
1315 // the classloader type based on the package name from the jimage using
1316 // a jimage API. If the classloader type cannot be found from the
1317 // jimage, it is determined by the class path entry.
1318 jshort loader_type = ClassLoader::APP_LOADER;
1319 if (e->is_jrt()) {
1320 ResourceMark rm;
1321 TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK_0);
1322 if (pkg_name != NULL) {
1323 const char* pkg_name_C_string = (const char*)(pkg_name->as_C_string());
1324 ClassPathImageEntry* cpie = (ClassPathImageEntry*)e;
1325 JImageFile* jimage = cpie->jimage();
1326 char* module_name = (char*)(*JImagePackageToModule)(jimage, pkg_name_C_string);
1327 if (module_name != NULL) {
1328 loader_type = ClassLoader::module_to_classloader(module_name);
1329 }
1330 }
1331 } else if (ClassLoaderExt::is_boot_classpath(classpath_index)) {
1332 loader_type = ClassLoader::BOOT_LOADER;
1333 }
1334 return loader_type;
1335 }
1336 #endif
1337
1338 // caller needs ResourceMark
1339 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1340 int class_name_len) {
1341 assert(class_name != NULL, "invariant");
1342 assert((int)strlen(class_name) == class_name_len, "invariant");
1343
1344 static const char class_suffix[] = ".class";
1345
1346 char* const file_name = NEW_RESOURCE_ARRAY(char,
1347 class_name_len +
1348 sizeof(class_suffix)); // includes term NULL
1349
1350 strncpy(file_name, class_name, class_name_len);
1351 strncpy(&file_name[class_name_len], class_suffix, sizeof(class_suffix));
1352
1353 return file_name;
1354 }
1355
1356 ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
1357 const GrowableArray<ModuleClassPathList*>* const module_list) {
1358 int num_of_entries = module_list->length();
1359 const Symbol* class_module_name = mod_entry->name();
1360
1361 // Loop through all the modules in either the patch-module or exploded entries looking for module
1362 for (int i = 0; i < num_of_entries; i++) {
1363 ModuleClassPathList* module_cpl = module_list->at(i);
1364 Symbol* module_cpl_name = module_cpl->module_name();
1365
1366 if (module_cpl_name->fast_compare(class_module_name) == 0) {
1367 // Class' module has been located.
1368 return module_cpl->module_first_entry();
1369 }
1370 }
1371 return NULL;
1372 }
1373
1374
1375 // Search either the patch-module or exploded build entries for class.
1376 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list,
1377 const char* const class_name,
1378 const char* const file_name,
1379 TRAPS) {
1380 ClassFileStream* stream = NULL;
1381
1382 // Find the class' defining module in the boot loader's module entry table
1383 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
1384 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL;
1385
1386 // If the module system has not defined java.base yet, then
1387 // classes loaded are assumed to be defined to java.base.
1388 // When java.base is eventually defined by the module system,
1389 // all packages of classes that have been previously loaded
1390 // are verified in ModuleEntryTable::verify_javabase_packages().
1391 if (!Universe::is_module_initialized() &&
1392 !ModuleEntryTable::javabase_defined() &&
1393 mod_entry == NULL) {
1394 mod_entry = ModuleEntryTable::javabase_moduleEntry();
1395 }
1396
1397 // The module must be a named module
1398 ClassPathEntry* e = NULL;
1399 if (mod_entry != NULL && mod_entry->is_named()) {
1400 if (module_list == _exploded_entries) {
1401 // The exploded build entries can be added to at any time so a lock is
1402 // needed when searching them.
1403 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
1404 MutexLocker ml(Module_lock, THREAD);
1405 e = find_first_module_cpe(mod_entry, module_list);
1406 } else {
1407 e = find_first_module_cpe(mod_entry, module_list);
1408 }
1409 }
1410
1411 // Try to load the class from the module's ClassPathEntry list.
1412 while (e != NULL) {
1413 stream = e->open_stream(file_name, CHECK_NULL);
1414 // No context.check is required since CDS is not supported
1415 // for an exploded modules build or if --patch-module is specified.
1416 if (NULL != stream) {
1417 return stream;
1418 }
1419 e = e->next();
1420 }
1421 // If the module was located, break out even if the class was not
1422 // located successfully from that module's ClassPathEntry list.
1423 // There will not be another valid entry for that module.
1424 return NULL;
1425 }
1426
1427 InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1428 assert(name != NULL, "invariant");
1429 assert(THREAD->is_Java_thread(), "must be a JavaThread");
1430
1431 ResourceMark rm(THREAD);
1432 HandleMark hm(THREAD);
1433
1434 const char* const class_name = name->as_C_string();
1435
1436 EventMark m("loading class %s", class_name);
1437 ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion);
1438
1439 const char* const file_name = file_name_for_class_name(class_name,
1440 name->utf8_length());
1441 assert(file_name != NULL, "invariant");
1442
1443 ClassLoaderExt::Context context(class_name, file_name, THREAD);
1444
1445 // Lookup stream for parsing .class file
1446 ClassFileStream* stream = NULL;
1447 s2 classpath_index = 0;
1448 ClassPathEntry* e = NULL;
1449
1450 // If DumpSharedSpaces is true boot loader visibility boundaries are set to:
1451 // - [jimage] + [_first_append_entry to _last_append_entry] (all path entries).
1452 //
1453 // If search_append_only is true, boot loader visibility boundaries are
1454 // set to be _first_append_entry to the end. This includes:
1455 // [-Xbootclasspath/a]; [jvmti appended entries]
1456 //
1457 // If both DumpSharedSpaces and search_append_only are false, boot loader
1458 // visibility boundaries are set to be the --patch-module entries plus the base piece.
1459 // This would include:
1460 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1461 //
1462 // DumpSharedSpaces and search_append_only are mutually exclusive and cannot
1463 // be true at the same time.
1464 assert(!(DumpSharedSpaces && search_append_only), "DumpSharedSpaces and search_append_only are both true");
1465
1466 // Load Attempt #1: --patch-module
1467 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1468 // attempt to load the class from those locations specific to the module.
1469 // Specifications to --patch-module can contain a partial number of classes
1470 // that are part of the overall module definition. So if a particular class is not
1471 // found within its module specification, the search should continue to Load Attempt #2.
1472 // Note: The --patch-module entries are never searched if the boot loader's
1473 // visibility boundary is limited to only searching the append entries.
1474 if (_patch_mod_entries != NULL && !search_append_only) {
1475 // At CDS dump time, the --patch-module entries are ignored. That means a
1476 // class is still loaded from the runtime image even if it might
1477 // appear in the _patch_mod_entries. The runtime shared class visibility
1478 // check will determine if a shared class is visible based on the runtime
1479 // environemnt, including the runtime --patch-module setting.
1480 if (!DumpSharedSpaces) {
1481 stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL);
1482 }
1483 }
1484
1485 // Load Attempt #2: [jimage | exploded build]
1486 if (!search_append_only && (NULL == stream)) {
1487 if (has_jrt_entry()) {
1488 e = _jrt_entry;
1489 stream = _jrt_entry->open_stream(file_name, CHECK_NULL);
1490 if (!context.check(stream, classpath_index)) {
1491 return NULL;
1492 }
1493 } else {
1494 // Exploded build - attempt to locate class in its defining module's location.
1495 assert(_exploded_entries != NULL, "No exploded build entries present");
1496 stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL);
1497 }
1498 }
1499
1500 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1501 if ((search_append_only || DumpSharedSpaces) && (NULL == stream)) {
1502 // For the boot loader append path search, the starting classpath_index
1503 // for the appended piece is always 1 to account for either the
1504 // _jrt_entry or the _exploded_entries.
1505 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1506 classpath_index = 1;
1507
1508 e = _first_append_entry;
1509 while (e != NULL) {
1510 stream = e->open_stream(file_name, CHECK_NULL);
1511 if (!context.check(stream, classpath_index)) {
1512 return NULL;
1513 }
1514 if (NULL != stream) {
1515 break;
1516 }
1517 e = e->next();
1518 ++classpath_index;
1519 }
1520 }
1521
1522 if (NULL == stream) {
1523 if (DumpSharedSpaces) {
1524 tty->print_cr("Preload Warning: Cannot find %s", class_name);
1525 }
1526 return NULL;
1527 }
1528
1529 stream->set_verify(context.should_verify(classpath_index));
1530
1531 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1532 Handle protection_domain;
1533
1534 InstanceKlass* result = KlassFactory::create_from_stream(stream,
1535 name,
1536 loader_data,
1537 protection_domain,
1538 NULL, // host_klass
1539 NULL, // cp_patches
1540 THREAD);
1541 if (HAS_PENDING_EXCEPTION) {
1542 if (DumpSharedSpaces) {
1543 tty->print_cr("Preload Error: Failed to load %s", class_name);
1544 }
1545 return NULL;
1546 }
1547
1548 return context.record_result(name, e, classpath_index, result, THREAD);
1549 }
1550
1551 // Initialize the class loader's access to methods in libzip. Parse and
1552 // process the boot classpath into a list ClassPathEntry objects. Once
1553 // this list has been created, it must not change order (see class PackageInfo)
1554 // it can be appended to and is by jvmti and the kernel vm.
1555
1556 void ClassLoader::initialize() {
1557 EXCEPTION_MARK;
1558
1559 if (UsePerfData) {
1560 // jvmstat performance counters
1561 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1562 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1563 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1564 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1565 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1566 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1567 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1568 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1569 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1570 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1571
1572 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1573 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1574 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1575 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1576 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1577 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1578 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1579 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1580 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1581 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1582 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1583 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1584 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1585
1586
1587 // The following performance counters are added for measuring the impact
1588 // of the bug fix of 6365597. They are mainly focused on finding out
1589 // the behavior of system & user-defined classloader lock, whether
1590 // ClassLoader.loadClass/findClass is being called synchronized or not.
1591 // Also two additional counters are created to see whether 'UnsyncloadClass'
1592 // flag is being set or not and how many times load_instance_class call
1593 // fails with linkageError etc.
1594 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1595 "systemLoaderLockContentionRate");
1596 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1597 "nonSystemLoaderLockContentionRate");
1598 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1599 "jvmFindLoadedClassNoLockCalls");
1600 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1601 "jvmDefineClassNoLockCalls");
1602
1603 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1604 "jniDefineClassNoLockCalls");
1605
1606 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1607 "unsafeDefineClassCalls");
1608
1609 NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet");
1610 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1611 "loadInstanceClassFailRate");
1612
1613 // increment the isUnsyncloadClass counter if UnsyncloadClass is set.
1614 if (UnsyncloadClass) {
1615 _isUnsyncloadClass->inc();
1616 }
1617 }
1618
1619 // lookup zip library entry points
1620 load_zip_library();
1621 // lookup jimage library entry points
1622 load_jimage_library();
1623 #if INCLUDE_CDS
1624 // initialize search path
1625 if (DumpSharedSpaces) {
1626 _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
1627 }
1628 #endif
1629 setup_bootstrap_search_path();
1630 }
1631
1632 #if INCLUDE_CDS
1633 void ClassLoader::initialize_shared_path() {
1634 if (DumpSharedSpaces) {
1635 ClassLoaderExt::setup_search_paths();
1636 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1637 }
1638 }
1639 #endif
1640
1641 jlong ClassLoader::classloader_time_ms() {
1642 return UsePerfData ?
1643 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1644 }
1645
1646 jlong ClassLoader::class_init_count() {
1647 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1648 }
1649
1650 jlong ClassLoader::class_init_time_ms() {
1651 return UsePerfData ?
1652 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1653 }
1654
1655 jlong ClassLoader::class_verify_time_ms() {
1656 return UsePerfData ?
1657 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1658 }
1659
1660 jlong ClassLoader::class_link_count() {
1661 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1662 }
1663
1664 jlong ClassLoader::class_link_time_ms() {
1665 return UsePerfData ?
1666 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1667 }
1668
1669 int ClassLoader::compute_Object_vtable() {
1670 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1671 // code to determine actual value from file
1672 // Would be value '11' if finals were in vtable
1673 int JDK_1_2_Object_vtable_size = 5;
1674 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1675 }
1676
1677
1678 void classLoader_init1() {
1679 ClassLoader::initialize();
1680 }
1681
1682 // Complete the ClassPathEntry setup for the boot loader
1683 void ClassLoader::classLoader_init2(TRAPS) {
1684 // Setup the list of module/path pairs for --patch-module processing
1685 // This must be done after the SymbolTable is created in order
1686 // to use fast_compare on module names instead of a string compare.
1687 if (Arguments::get_patch_mod_prefix() != NULL) {
1688 setup_patch_mod_entries();
1689 }
1690
1691 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
1692 // to successfully determine if java.base has been patched)
1693 create_javabase();
1694
1695 // Setup the initial java.base/path pair for the exploded build entries.
1696 // As more modules are defined during module system initialization, more
1697 // entries will be added to the exploded build array.
1698 if (!has_jrt_entry()) {
1699 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds");
1700 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds");
1701 // Set up the boot loader's _exploded_entries list. Note that this gets
1702 // done before loading any classes, by the same thread that will
1703 // subsequently do the first class load. So, no lock is needed for this.
1704 assert(_exploded_entries == NULL, "Should only get initialized once");
1705 _exploded_entries = new (ResourceObj::C_HEAP, mtModule)
1706 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true);
1707 add_to_exploded_build_list(vmSymbols::java_base(), CHECK);
1708 }
1709 }
1710
1711
1712 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1713 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1714 if (CanonicalizeEntry != NULL) {
1715 JavaThread* THREAD = JavaThread::current();
1716 JNIEnv* env = THREAD->jni_environment();
1717 ResourceMark rm(THREAD);
1718
1719 // os::native_path writes into orig_copy
1720 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1721 strcpy(orig_copy, orig);
1722 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1723 return false;
1724 }
1725 } else {
1726 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1727 strncpy(out, orig, len);
1728 out[len - 1] = '\0';
1729 }
1730 return true;
1731 }
1732
1733 void ClassLoader::create_javabase() {
1734 Thread* THREAD = Thread::current();
1735
1736 // Create java.base's module entry for the boot
1737 // class loader prior to loading j.l.Ojbect.
1738 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1739
1740 // Get module entry table
1741 ModuleEntryTable* null_cld_modules = null_cld->modules();
1742 if (null_cld_modules == NULL) {
1743 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1744 }
1745
1746 {
1747 MutexLocker ml(Module_lock, THREAD);
1748 ModuleEntry* jb_module = null_cld_modules->locked_create_entry_or_null(Handle(),
1749 false, vmSymbols::java_base(), NULL, NULL, null_cld);
1750 if (jb_module == NULL) {
1751 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
1752 }
1753 ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1754 }
1755 }
1756
1757 #ifndef PRODUCT
1758
1759 // CompileTheWorld
1760 //
1761 // Iterates over all class path entries and forces compilation of all methods
1762 // in all classes found. Currently, only zip/jar archives are searched.
1763 //
1764 // The classes are loaded by the Java level bootstrap class loader, and the
1765 // initializer is called. If DelayCompilationDuringStartup is true (default),
1766 // the interpreter will run the initialization code. Note that forcing
1767 // initialization in this way could potentially lead to initialization order
1768 // problems, in which case we could just force the initialization bit to be set.
1769
1770
1771 // We need to iterate over the contents of a zip/jar file, so we replicate the
1772 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1773 // since jzfile already has a void* definition.
1774 //
1775 // Note that this is only used in debug mode.
1776 //
1777 // HotSpot integration note:
1778 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1779
1780
1781 // JDK 1.3 version
1782 typedef struct real_jzentry { /* Zip file entry */
1783 char *name; /* entry name */
1784 jint time; /* modification time */
1785 jint size; /* size of uncompressed data */
1786 jint csize; /* size of compressed data (zero if uncompressed) */
1787 jint crc; /* crc of uncompressed data */
1788 char *comment; /* optional zip file comment */
1789 jbyte *extra; /* optional extra data */
1790 jint pos; /* position of LOC header (if negative) or data */
1791 } real_jzentry;
1792
1793 typedef struct real_jzfile { /* Zip file */
1794 char *name; /* zip file name */
1795 jint refs; /* number of active references */
1796 jint fd; /* open file descriptor */
1797 void *lock; /* read lock */
1798 char *comment; /* zip file comment */
1799 char *msg; /* zip error message */
1800 void *entries; /* array of hash cells */
1801 jint total; /* total number of entries */
1802 unsigned short *table; /* Hash chain heads: indexes into entries */
1803 jint tablelen; /* number of hash eads */
1804 real_jzfile *next; /* next zip file in search list */
1805 jzentry *cache; /* we cache the most recently freed jzentry */
1806 /* Information on metadata names in META-INF directory */
1807 char **metanames; /* array of meta names (may have null names) */
1808 jint metacount; /* number of slots in metanames array */
1809 /* If there are any per-entry comments, they are in the comments array */
1810 char **comments;
1811 } real_jzfile;
1812
1813 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1814 // For now we only compile all methods in all classes in zip/jar files
1815 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1816 tty->cr();
1817 }
1818
1819 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1820 real_jzfile* zip = (real_jzfile*) _zip;
1821 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1822 tty->cr();
1823 // Iterate over all entries in zip file
1824 for (int n = 0; ; n++) {
1825 real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n));
1826 if (ze == NULL) break;
1827 ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1828 }
1829 if (HAS_PENDING_EXCEPTION) {
1830 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1831 CLEAR_PENDING_EXCEPTION;
1832 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1833 tty->print_cr("Increase class metadata storage if a limit was set");
1834 } else {
1835 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1836 }
1837 }
1838 }
1839
1840 void ClassLoader::compile_the_world() {
1841 EXCEPTION_MARK;
1842 HandleMark hm(THREAD);
1843 ResourceMark rm(THREAD);
1844
1845 assert(has_jrt_entry(), "Compile The World not supported with exploded module build");
1846
1847 // Find bootstrap loader
1848 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1849 jlong start = os::javaTimeMillis();
1850
1851 // Compile the world for the modular java runtime image
1852 _jrt_entry->compile_the_world(system_class_loader, CATCH);
1853
1854 // Iterate over all bootstrap class path appended entries
1855 ClassPathEntry* e = _first_append_entry;
1856 while (e != NULL) {
1857 assert(!e->is_jrt(), "A modular java runtime image is present on the list of appended entries");
1858 e->compile_the_world(system_class_loader, CATCH);
1859 e = e->next();
1860 }
1861 jlong end = os::javaTimeMillis();
1862 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1863 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1864 {
1865 // Print statistics as if before normal exit:
1866 extern void print_statistics();
1867 print_statistics();
1868 }
1869 vm_exit(0);
1870 }
1871
1872 int ClassLoader::_compile_the_world_class_counter = 0;
1873 int ClassLoader::_compile_the_world_method_counter = 0;
1874 static int _codecache_sweep_counter = 0;
1875
1876 // Filter out all exceptions except OOMs
1877 static void clear_pending_exception_if_not_oom(TRAPS) {
1878 if (HAS_PENDING_EXCEPTION &&
1879 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1880 CLEAR_PENDING_EXCEPTION;
1881 }
1882 // The CHECK at the caller will propagate the exception out
1883 }
1884
1885 /**
1886 * Returns if the given method should be compiled when doing compile-the-world.
1887 *
1888 * TODO: This should be a private method in a CompileTheWorld class.
1889 */
1890 static bool can_be_compiled(methodHandle m, int comp_level) {
1891 assert(CompileTheWorld, "must be");
1892
1893 // It's not valid to compile a native wrapper for MethodHandle methods
1894 // that take a MemberName appendix since the bytecode signature is not
1895 // correct.
1896 vmIntrinsics::ID iid = m->intrinsic_id();
1897 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1898 return false;
1899 }
1900
1901 return CompilationPolicy::can_be_compiled(m, comp_level);
1902 }
1903
1904 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1905 if (string_ends_with(name, ".class")) {
1906 // We have a .class file
1907 int len = (int)strlen(name);
1908 char buffer[2048];
1909 strncpy(buffer, name, len - 6);
1910 buffer[len-6] = 0;
1911 // If the file has a period after removing .class, it's not really a
1912 // valid class file. The class loader will check everything else.
1913 if (strchr(buffer, '.') == NULL) {
1914 _compile_the_world_class_counter++;
1915 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
1916
1917 // Construct name without extension
1918 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
1919 // Use loader to load and initialize class
1920 Klass* k = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
1921 if (k != NULL && !HAS_PENDING_EXCEPTION) {
1922 k->initialize(THREAD);
1923 }
1924 bool exception_occurred = HAS_PENDING_EXCEPTION;
1925 clear_pending_exception_if_not_oom(CHECK);
1926 if (CompileTheWorldPreloadClasses && k != NULL) {
1927 InstanceKlass* ik = InstanceKlass::cast(k);
1928 ConstantPool::preload_and_initialize_all_classes(ik->constants(), THREAD);
1929 if (HAS_PENDING_EXCEPTION) {
1930 // If something went wrong in preloading we just ignore it
1931 clear_pending_exception_if_not_oom(CHECK);
1932 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
1933 }
1934 }
1935
1936 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
1937 if (k == NULL || exception_occurred) {
1938 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
1939 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
1940 } else {
1941 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
1942 // Preload all classes to get around uncommon traps
1943 // Iterate over all methods in class
1944 int comp_level = CompilationPolicy::policy()->initial_compile_level();
1945 InstanceKlass* ik = InstanceKlass::cast(k);
1946 for (int n = 0; n < ik->methods()->length(); n++) {
1947 methodHandle m (THREAD, ik->methods()->at(n));
1948 if (can_be_compiled(m, comp_level)) {
1949 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
1950 // Give sweeper a chance to keep up with CTW
1951 VM_CTWThreshold op;
1952 VMThread::execute(&op);
1953 _codecache_sweep_counter = 0;
1954 }
1955 // Force compilation
1956 CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
1957 methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
1958 if (HAS_PENDING_EXCEPTION) {
1959 clear_pending_exception_if_not_oom(CHECK);
1960 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1961 } else {
1962 _compile_the_world_method_counter++;
1963 }
1964 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
1965 // Clobber the first compile and force second tier compilation
1966 CompiledMethod* nm = m->code();
1967 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1968 // Throw out the code so that the code cache doesn't fill up
1969 nm->make_not_entrant();
1970 }
1971 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
1972 methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
1973 if (HAS_PENDING_EXCEPTION) {
1974 clear_pending_exception_if_not_oom(CHECK);
1975 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1976 } else {
1977 _compile_the_world_method_counter++;
1978 }
1979 }
1980 } else {
1981 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1982 }
1983
1984 CompiledMethod* nm = m->code();
1985 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1986 // Throw out the code so that the code cache doesn't fill up
1987 nm->make_not_entrant();
1988 }
1989 }
1990 }
1991 }
1992 }
1993 }
1994 }
1995
1996 #endif //PRODUCT
1997
1998 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1999 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
2000 void PerfClassTraceTime::initialize() {
2001 if (!UsePerfData) return;
2002
2003 if (_eventp != NULL) {
2004 // increment the event counter
2005 _eventp->inc();
2006 }
2007
2008 // stop the current active thread-local timer to measure inclusive time
2009 _prev_active_event = -1;
2010 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
2011 if (_timers[i].is_active()) {
2012 assert(_prev_active_event == -1, "should have only one active timer");
2013 _prev_active_event = i;
2014 _timers[i].stop();
2015 }
2016 }
2017
2018 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
2019 // start the inclusive timer if not recursively called
2020 _t.start();
2021 }
2022
2023 // start thread-local timer of the given event type
2024 if (!_timers[_event_type].is_active()) {
2025 _timers[_event_type].start();
2026 }
2027 }
2028
2029 PerfClassTraceTime::~PerfClassTraceTime() {
2030 if (!UsePerfData) return;
2031
2032 // stop the thread-local timer as the event completes
2033 // and resume the thread-local timer of the event next on the stack
2034 _timers[_event_type].stop();
2035 jlong selftime = _timers[_event_type].ticks();
2036
2037 if (_prev_active_event >= 0) {
2038 _timers[_prev_active_event].start();
2039 }
2040
2041 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
2042
2043 // increment the counters only on the leaf call
2044 _t.stop();
2045 _timep->inc(_t.ticks());
2046 if (_selftimep != NULL) {
2047 _selftimep->inc(selftime);
2048 }
2049 // add all class loading related event selftime to the accumulated time counter
2050 ClassLoader::perf_accumulated_time()->inc(selftime);
2051
2052 // reset the timer
2053 _timers[_event_type].reset();
2054 }