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/logTag.hpp"
44 #include "memory/allocation.inline.hpp"
45 #include "memory/filemap.hpp"
46 #include "memory/oopFactory.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.inline.hpp"
49 #include "oops/instanceKlass.hpp"
50 #include "oops/instanceRefKlass.hpp"
51 #include "oops/objArrayOop.inline.hpp"
52 #include "oops/oop.inline.hpp"
53 #include "oops/symbol.hpp"
54 #include "prims/jvm.h"
55 #include "prims/jvm_misc.hpp"
56 #include "runtime/arguments.hpp"
57 #include "runtime/compilationPolicy.hpp"
58 #include "runtime/fprofiler.hpp"
59 #include "runtime/handles.hpp"
60 #include "runtime/handles.inline.hpp"
61 #include "runtime/init.hpp"
62 #include "runtime/interfaceSupport.hpp"
63 #include "runtime/java.hpp"
64 #include "runtime/javaCalls.hpp"
65 #include "runtime/os.hpp"
66 #include "runtime/threadCritical.hpp"
67 #include "runtime/timer.hpp"
68 #include "runtime/vm_version.hpp"
69 #include "services/management.hpp"
70 #include "services/threadService.hpp"
71 #include "utilities/events.hpp"
72 #include "utilities/hashtable.inline.hpp"
73 #include "utilities/macros.hpp"
74 #if INCLUDE_CDS
75 #include "classfile/sharedClassUtil.hpp"
76 #include "classfile/sharedPathsMiscInfo.hpp"
77 #endif
78
79 // Entry points in zip.dll for loading zip/jar file entries
80
81 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg);
82 typedef void (JNICALL *ZipClose_t)(jzfile *zip);
83 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
84 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
85 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n);
86 typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg);
87 typedef jint (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len);
88
89 static ZipOpen_t ZipOpen = NULL;
90 static ZipClose_t ZipClose = NULL;
91 static FindEntry_t FindEntry = NULL;
92 static ReadEntry_t ReadEntry = NULL;
93 static GetNextEntry_t GetNextEntry = NULL;
94 static canonicalize_fn_t CanonicalizeEntry = NULL;
95 static ZipInflateFully_t ZipInflateFully = NULL;
96 static Crc32_t Crc32 = NULL;
97
98 // Entry points for jimage.dll for loading jimage file entries
99
100 static JImageOpen_t JImageOpen = NULL;
101 static JImageClose_t JImageClose = NULL;
102 static JImagePackageToModule_t JImagePackageToModule = NULL;
103 static JImageFindResource_t JImageFindResource = NULL;
104 static JImageGetResource_t JImageGetResource = NULL;
105 static JImageResourceIterator_t JImageResourceIterator = NULL;
106 static JImage_ResourcePath_t JImageResourcePath = NULL;
107
108 // Globals
109
110 PerfCounter* ClassLoader::_perf_accumulated_time = NULL;
111 PerfCounter* ClassLoader::_perf_classes_inited = NULL;
112 PerfCounter* ClassLoader::_perf_class_init_time = NULL;
113 PerfCounter* ClassLoader::_perf_class_init_selftime = NULL;
114 PerfCounter* ClassLoader::_perf_classes_verified = NULL;
115 PerfCounter* ClassLoader::_perf_class_verify_time = NULL;
116 PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL;
117 PerfCounter* ClassLoader::_perf_classes_linked = NULL;
118 PerfCounter* ClassLoader::_perf_class_link_time = NULL;
119 PerfCounter* ClassLoader::_perf_class_link_selftime = NULL;
120 PerfCounter* ClassLoader::_perf_class_parse_time = NULL;
121 PerfCounter* ClassLoader::_perf_class_parse_selftime = NULL;
122 PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL;
123 PerfCounter* ClassLoader::_perf_shared_classload_time = NULL;
124 PerfCounter* ClassLoader::_perf_sys_classload_time = NULL;
125 PerfCounter* ClassLoader::_perf_app_classload_time = NULL;
126 PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL;
127 PerfCounter* ClassLoader::_perf_app_classload_count = NULL;
128 PerfCounter* ClassLoader::_perf_define_appclasses = NULL;
129 PerfCounter* ClassLoader::_perf_define_appclass_time = NULL;
130 PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL;
131 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL;
132 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL;
133 PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
134 PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
135 PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
136 PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
137 PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
138 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL;
139 PerfCounter* ClassLoader::_isUnsyncloadClass = NULL;
140 PerfCounter* ClassLoader::_load_instance_class_failCounter = NULL;
141
142 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = NULL;
143 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = NULL;
144 ClassPathEntry* ClassLoader::_jrt_entry = NULL;
145 ClassPathEntry* ClassLoader::_first_append_entry = NULL;
146 ClassPathEntry* ClassLoader::_last_append_entry = NULL;
147 int ClassLoader::_num_entries = 0;
148 #if INCLUDE_CDS
149 GrowableArray<char*>* ClassLoader::_boot_modules_array = NULL;
150 GrowableArray<char*>* ClassLoader::_platform_modules_array = NULL;
151 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL;
152 #endif
153
154 // helper routines
155 bool string_starts_with(const char* str, const char* str_to_find) {
156 size_t str_len = strlen(str);
157 size_t str_to_find_len = strlen(str_to_find);
158 if (str_to_find_len > str_len) {
159 return false;
160 }
161 return (strncmp(str, str_to_find, str_to_find_len) == 0);
162 }
163
164 static const char* get_jimage_version_string() {
165 static char version_string[10] = "";
166 if (version_string[0] == '\0') {
167 jio_snprintf(version_string, sizeof(version_string), "%d.%d",
168 Abstract_VM_Version::vm_major_version(), Abstract_VM_Version::vm_minor_version());
169 }
170 return (const char*)version_string;
171 }
172
173 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) {
174 size_t str_len = strlen(str);
175 size_t str_to_find_len = strlen(str_to_find);
176 if (str_to_find_len > str_len) {
177 return false;
178 }
179 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
180 }
181
182 // Used to obtain the package name from a fully qualified class name.
183 // It is the responsibility of the caller to establish a ResourceMark.
184 const char* ClassLoader::package_from_name(const char* const class_name, bool* bad_class_name) {
185 if (class_name == NULL) {
186 if (bad_class_name != NULL) {
187 *bad_class_name = true;
188 }
189 return NULL;
190 }
191
192 if (bad_class_name != NULL) {
193 *bad_class_name = false;
194 }
195
196 const char* const last_slash = strrchr(class_name, '/');
197 if (last_slash == NULL) {
198 // No package name
199 return NULL;
200 }
201
202 char* class_name_ptr = (char*) class_name;
203 // Skip over '['s
204 if (*class_name_ptr == '[') {
205 do {
206 class_name_ptr++;
207 } while (*class_name_ptr == '[');
208
209 // Fully qualified class names should not contain a 'L'.
210 // Set bad_class_name to true to indicate that the package name
211 // could not be obtained due to an error condition.
212 // In this situation, is_same_class_package returns false.
213 if (*class_name_ptr == 'L') {
214 if (bad_class_name != NULL) {
215 *bad_class_name = true;
216 }
217 return NULL;
218 }
219 }
220
221 int length = last_slash - class_name_ptr;
222
223 // A class name could have just the slash character in the name.
224 if (length <= 0) {
225 // No package name
226 if (bad_class_name != NULL) {
227 *bad_class_name = true;
228 }
229 return NULL;
230 }
231
232 // drop name after last slash (including slash)
233 // Ex., "java/lang/String.class" => "java/lang"
234 char* pkg_name = NEW_RESOURCE_ARRAY(char, length + 1);
235 strncpy(pkg_name, class_name_ptr, length);
236 *(pkg_name+length) = '\0';
237
238 return (const char *)pkg_name;
239 }
240
241 // Given a fully qualified class name, find its defining package in the class loader's
242 // package entry table.
243 static PackageEntry* get_package_entry(const char* class_name, ClassLoaderData* loader_data, TRAPS) {
244 ResourceMark rm(THREAD);
245 const char *pkg_name = ClassLoader::package_from_name(class_name);
246 if (pkg_name == NULL) {
247 return NULL;
248 }
249 PackageEntryTable* pkgEntryTable = loader_data->packages();
250 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(pkg_name, CHECK_NULL);
251 return pkgEntryTable->lookup_only(pkg_symbol);
252 }
253
254 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() {
255 char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
256 strcpy(copy, dir);
257 _dir = copy;
258 }
259
260
261 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
262 // construct full path name
263 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
264 if (jio_snprintf(path, JVM_MAXPATHLEN, "%s%s%s", _dir, os::file_separator(), name) == -1) {
265 FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN);
266 return NULL;
267 }
268 // check if file exists
269 struct stat st;
270 if (os::stat(path, &st) == 0) {
271 #if INCLUDE_CDS
272 if (DumpSharedSpaces) {
273 // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so
274 // we should never find a file underneath it -- unless user has added a new file while we are running
275 // the dump, in which case let's quit!
276 ShouldNotReachHere();
277 }
278 #endif
279 // found file, open it
280 int file_handle = os::open(path, 0, 0);
281 if (file_handle != -1) {
282 // read contents into resource array
283 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
284 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
285 // close file
286 os::close(file_handle);
287 // construct ClassFileStream
288 if (num_read == (size_t)st.st_size) {
289 if (UsePerfData) {
290 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
291 }
292 FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN);
293 // Resource allocated
294 return new ClassFileStream(buffer,
295 st.st_size,
296 _dir,
297 ClassFileStream::verify);
298 }
299 }
300 }
301 FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN);
302 return NULL;
303 }
304
305 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name, bool is_boot_append) : ClassPathEntry() {
306 _zip = zip;
307 char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
308 strcpy(copy, zip_name);
309 _zip_name = copy;
310 _is_boot_append = is_boot_append;
311 _multi_versioned = _unknown;
312 }
313
314 ClassPathZipEntry::~ClassPathZipEntry() {
315 if (ZipClose != NULL) {
316 (*ZipClose)(_zip);
317 }
318 FREE_C_HEAP_ARRAY(char, _zip_name);
319 }
320
321 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
322 // enable call to C land
323 JavaThread* thread = JavaThread::current();
324 ThreadToNativeFromVM ttn(thread);
325 // check whether zip archive contains name
326 jint name_len;
327 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
328 if (entry == NULL) return NULL;
329 u1* buffer;
330 char name_buf[128];
331 char* filename;
332 if (name_len < 128) {
333 filename = name_buf;
334 } else {
335 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
336 }
337
338 // read contents into resource array
339 int size = (*filesize) + ((nul_terminate) ? 1 : 0);
340 buffer = NEW_RESOURCE_ARRAY(u1, size);
341 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
342
343 // return result
344 if (nul_terminate) {
345 buffer[*filesize] = 0;
346 }
347 return buffer;
348 }
349
350 #if INCLUDE_CDS
351 u1* ClassPathZipEntry::open_versioned_entry(const char* name, jint* filesize, TRAPS) {
352 u1* buffer = NULL;
353 if (DumpSharedSpaces && !_is_boot_append) {
354 // We presume default is multi-release enabled
355 const char* multi_ver = Arguments::get_property("jdk.util.jar.enableMultiRelease");
356 const char* verstr = Arguments::get_property("jdk.util.jar.version");
357 bool is_multi_ver = (multi_ver == NULL ||
358 strcmp(multi_ver, "true") == 0 ||
359 strcmp(multi_ver, "force") == 0) &&
360 is_multiple_versioned(THREAD);
361 // command line version setting
362 int version = 0;
363 const int base_version = 8; // JDK8
364 int cur_ver = JDK_Version::current().major_version();
365 if (verstr != NULL) {
366 version = atoi(verstr);
367 if (version < base_version || version > cur_ver) {
368 // If the specified version is lower than the base version, the base
369 // entry will be used; if the version is higher than the current
370 // jdk version, the highest versioned entry will be used.
371 if (version < base_version) {
372 is_multi_ver = false;
373 }
374 // print out warning, do not use assertion here since it will continue to look
375 // for proper version.
376 warning("JDK%d is not supported in multiple version jars", version);
377 }
378 }
379
380 if (is_multi_ver) {
381 int n;
382 char* entry_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
383 if (version > 0) {
384 n = jio_snprintf(entry_name, JVM_MAXPATHLEN, "META-INF/versions/%d/%s", version, name);
385 entry_name[n] = '\0';
386 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
387 if (buffer == NULL) {
388 warning("Could not find %s in %s, try to find highest version instead", entry_name, _zip_name);
389 }
390 }
391 if (buffer == NULL) {
392 for (int i = cur_ver; i >= base_version; i--) {
393 n = jio_snprintf(entry_name, JVM_MAXPATHLEN, "META-INF/versions/%d/%s", i, name);
394 entry_name[n] = '\0';
395 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
396 if (buffer != NULL) {
397 break;
398 }
399 }
400 }
401 FREE_RESOURCE_ARRAY(char, entry_name, JVM_MAXPATHLEN);
402 }
403 }
404 return buffer;
405 }
406
407 bool ClassPathZipEntry::is_multiple_versioned(TRAPS) {
408 assert(DumpSharedSpaces, "called only at dump time");
409 if (_multi_versioned != _unknown) {
410 return (_multi_versioned == _yes) ? true : false;
411 }
412 jint size;
413 char* buffer = (char*)open_entry("META-INF/MANIFEST.MF", &size, true, CHECK_false);
414 if (buffer != NULL) {
415 char* p = buffer;
416 for ( ; *p; ++p) *p = tolower(*p);
417 if (strstr(buffer, "multi-release: true") != NULL) {
418 _multi_versioned = _yes;
419 return true;
420 }
421 }
422 _multi_versioned = _no;
423 return false;
424 }
425 #endif // INCLUDE_CDS
426
427 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
428 jint filesize;
429 u1* buffer = open_versioned_entry(name, &filesize, CHECK_NULL);
430 if (buffer == NULL) {
431 buffer = open_entry(name, &filesize, false, CHECK_NULL);
432 if (buffer == NULL) {
433 return NULL;
434 }
435 }
436 if (UsePerfData) {
437 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
438 }
439 // Resource allocated
440 return new ClassFileStream(buffer,
441 filesize,
442 _zip_name,
443 ClassFileStream::verify);
444 }
445
446 // invoke function for each entry in the zip file
447 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
448 JavaThread* thread = JavaThread::current();
449 HandleMark handle_mark(thread);
450 ThreadToNativeFromVM ttn(thread);
451 for (int n = 0; ; n++) {
452 jzentry * ze = ((*GetNextEntry)(_zip, n));
453 if (ze == NULL) break;
454 (*f)(ze->name, context);
455 }
456 }
457
458 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
459 ClassPathEntry(),
460 _jimage(jimage) {
461 guarantee(jimage != NULL, "jimage file is null");
462 guarantee(name != NULL, "jimage file name is null");
463 size_t len = strlen(name) + 1;
464 _name = NEW_C_HEAP_ARRAY(const char, len, mtClass);
465 strncpy((char *)_name, name, len);
466 }
467
468 ClassPathImageEntry::~ClassPathImageEntry() {
469 if (_name != NULL) {
470 FREE_C_HEAP_ARRAY(const char, _name);
471 _name = NULL;
472 }
473 if (_jimage != NULL) {
474 (*JImageClose)(_jimage);
475 _jimage = NULL;
476 }
477 }
478
479 // For a class in a named module, look it up in the jimage file using this syntax:
480 // /<module-name>/<package-name>/<base-class>
481 //
482 // Assumptions:
483 // 1. There are no unnamed modules in the jimage file.
484 // 2. A package is in at most one module in the jimage file.
485 //
486 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
487 jlong size;
488 JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size);
489
490 if (location == 0) {
491 ResourceMark rm;
492 const char* pkg_name = ClassLoader::package_from_name(name);
493
494 if (pkg_name != NULL) {
495 if (!Universe::is_module_initialized()) {
496 location = (*JImageFindResource)(_jimage, JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
497 #if INCLUDE_CDS
498 // CDS uses the boot class loader to load classes whose packages are in
499 // modules defined for other class loaders. So, for now, get their module
500 // names from the "modules" jimage file.
501 if (DumpSharedSpaces && location == 0) {
502 const char* module_name = (*JImagePackageToModule)(_jimage, pkg_name);
503 if (module_name != NULL) {
504 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
505 }
506 }
507 #endif
508
509 } else {
510 PackageEntry* package_entry = get_package_entry(name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
511 if (package_entry != NULL) {
512 ResourceMark rm;
513 // Get the module name
514 ModuleEntry* module = package_entry->module();
515 assert(module != NULL, "Boot classLoader package missing module");
516 assert(module->is_named(), "Boot classLoader package is in unnamed module");
517 const char* module_name = module->name()->as_C_string();
518 if (module_name != NULL) {
519 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
520 }
521 }
522 }
523 }
524 }
525 if (location != 0) {
526 if (UsePerfData) {
527 ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
528 }
529 char* data = NEW_RESOURCE_ARRAY(char, size);
530 (*JImageGetResource)(_jimage, location, data, size);
531 // Resource allocated
532 return new ClassFileStream((u1*)data,
533 (int)size,
534 _name,
535 ClassFileStream::verify);
536 }
537
538 return NULL;
539 }
540
541 #ifndef PRODUCT
542 bool ctw_visitor(JImageFile* jimage,
543 const char* module_name, const char* version, const char* package,
544 const char* name, const char* extension, void* arg) {
545 if (strcmp(extension, "class") == 0) {
546 Thread* THREAD = Thread::current();
547 ResourceMark rm(THREAD);
548 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JIMAGE_MAX_PATH);
549 jio_snprintf(path, JIMAGE_MAX_PATH - 1, "%s/%s.class", package, name);
550 ClassLoader::compile_the_world_in(path, *(Handle*)arg, THREAD);
551 return !HAS_PENDING_EXCEPTION;
552 }
553 return true;
554 }
555
556 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) {
557 tty->print_cr("CompileTheWorld : Compiling all classes in %s", name());
558 tty->cr();
559 (*JImageResourceIterator)(_jimage, (JImageResourceVisitor_t)ctw_visitor, (void *)&loader);
560 if (HAS_PENDING_EXCEPTION) {
561 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
562 CLEAR_PENDING_EXCEPTION;
563 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
564 tty->print_cr("Increase class metadata storage if a limit was set");
565 } else {
566 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
567 }
568 }
569 }
570 #endif
571
572 bool ClassPathImageEntry::is_jrt() {
573 return ClassLoader::is_jrt(name());
574 }
575
576 #if INCLUDE_CDS
577 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
578 assert(DumpSharedSpaces, "only called at dump time");
579 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure");
580 vm_exit_during_initialization(error, message);
581 }
582 #endif
583
584 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
585 _module_name = module_name;
586 _module_first_entry = NULL;
587 _module_last_entry = NULL;
588 }
589
590 ModuleClassPathList::~ModuleClassPathList() {
591 // Clean out each ClassPathEntry on list
592 ClassPathEntry* e = _module_first_entry;
593 while (e != NULL) {
594 ClassPathEntry* next_entry = e->next();
595 delete e;
596 e = next_entry;
597 }
598 }
599
600 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
601 if (new_entry != NULL) {
602 if (_module_last_entry == NULL) {
603 _module_first_entry = _module_last_entry = new_entry;
604 } else {
605 _module_last_entry->set_next(new_entry);
606 _module_last_entry = new_entry;
607 }
608 }
609 }
610
611 void ClassLoader::trace_class_path(const char* msg, const char* name) {
612 if (log_is_enabled(Info, class, path)) {
613 ResourceMark rm;
614 outputStream* out = Log(class, path)::info_stream();
615 if (msg) {
616 out->print("%s", msg);
617 }
618 if (name) {
619 if (strlen(name) < 256) {
620 out->print("%s", name);
621 } else {
622 // For very long paths, we need to print each character separately,
623 // as print_cr() has a length limit
624 while (name[0] != '\0') {
625 out->print("%c", name[0]);
626 name++;
627 }
628 }
629 }
630 out->cr();
631 }
632 }
633
634 #if INCLUDE_CDS
635 void ClassLoader::check_shared_classpath(const char *path) {
636 if (strcmp(path, "") == 0) {
637 exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
638 }
639
640 struct stat st;
641 if (os::stat(path, &st) == 0) {
642 if ((st.st_mode & S_IFMT) != S_IFREG) { // is not a regular file
643 if (!os::dir_is_empty(path)) {
644 tty->print_cr("Error: non-empty directory '%s'", path);
645 exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL);
646 }
647 }
648 }
649 }
650 #endif
651
652 void ClassLoader::setup_bootstrap_search_path() {
653 const char* sys_class_path = Arguments::get_sysclasspath();
654 const char* java_class_path = Arguments::get_appclasspath();
655 if (PrintSharedArchiveAndExit) {
656 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
657 // the same as the bootcp of the shared archive.
658 } else {
659 trace_class_path("bootstrap loader class path=", sys_class_path);
660 trace_class_path("classpath: ", java_class_path);
661 }
662 #if INCLUDE_CDS
663 if (DumpSharedSpaces) {
664 _shared_paths_misc_info->add_boot_classpath(sys_class_path);
665 }
666 #endif
667 setup_search_path(sys_class_path, true);
668 }
669
670 #if INCLUDE_CDS
671 int ClassLoader::get_shared_paths_misc_info_size() {
672 return _shared_paths_misc_info->get_used_bytes();
673 }
674
675 void* ClassLoader::get_shared_paths_misc_info() {
676 return _shared_paths_misc_info->buffer();
677 }
678
679 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
680 SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
681 bool result = checker->check();
682 delete checker;
683 return result;
684 }
685 #endif
686
687 // Construct the array of module/path pairs as specified to --patch-module
688 // for the boot loader to search ahead of the jimage, if the class being
689 // loaded is defined to a module that has been specified to --patch-module.
690 void ClassLoader::setup_patch_mod_entries() {
691 Thread* THREAD = Thread::current();
692 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
693 int num_of_entries = patch_mod_args->length();
694
695
696 // Set up the boot loader's _patch_mod_entries list
697 _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true);
698
699 for (int i = 0; i < num_of_entries; i++) {
700 const char* module_name = (patch_mod_args->at(i))->module_name();
701 Symbol* const module_sym = SymbolTable::lookup(module_name, (int)strlen(module_name), CHECK);
702 assert(module_sym != NULL, "Failed to obtain Symbol for module name");
703 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
704
705 char* class_path = (patch_mod_args->at(i))->path_string();
706 int len = (int)strlen(class_path);
707 int end = 0;
708 // Iterate over the module's class path entries
709 for (int start = 0; start < len; start = end) {
710 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
711 end++;
712 }
713 EXCEPTION_MARK;
714 ResourceMark rm(THREAD);
715 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
716 strncpy(path, &class_path[start], end - start);
717 path[end - start] = '\0';
718
719 struct stat st;
720 if (os::stat(path, &st) == 0) {
721 // File or directory found
722 Thread* THREAD = Thread::current();
723 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
724 // If the path specification is valid, enter it into this module's list
725 if (new_entry != NULL) {
726 module_cpl->add_to_list(new_entry);
727 }
728 }
729
730 while (class_path[end] == os::path_separator()[0]) {
731 end++;
732 }
733 }
734
735 // Record the module into the list of --patch-module entries only if
736 // valid ClassPathEntrys have been created
737 if (module_cpl->module_first_entry() != NULL) {
738 _patch_mod_entries->push(module_cpl);
739 }
740 }
741 }
742
743 // Determine whether the module has been patched via the command-line
744 // option --patch-module
745 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
746 if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) {
747 int table_len = _patch_mod_entries->length();
748 for (int i = 0; i < table_len; i++) {
749 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
750 if (module_name->fast_compare(patch_mod->module_name()) == 0) {
751 return true;
752 }
753 }
754 }
755 return false;
756 }
757
758 void ClassLoader::setup_search_path(const char *class_path, bool bootstrap_search) {
759 int len = (int)strlen(class_path);
760 int end = 0;
761 bool set_base_piece = bootstrap_search;
762
763 // Iterate over class path entries
764 for (int start = 0; start < len; start = end) {
765 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
766 end++;
767 }
768 EXCEPTION_MARK;
769 ResourceMark rm(THREAD);
770 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
771 strncpy(path, &class_path[start], end - start);
772 path[end - start] = '\0';
773
774 // The first time through the bootstrap_search setup, it must be determined
775 // what the base or core piece of the boot loader search is. Either a java runtime
776 // image is present or this is an exploded module build situation.
777 if (set_base_piece) {
778 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
779 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
780 struct stat st;
781 if (os::stat(path, &st) == 0) {
782 // Directory found
783 Thread* THREAD = Thread::current();
784 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
785
786 // Check for a jimage
787 if (Arguments::has_jimage()) {
788 assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice");
789 assert(new_entry != NULL && new_entry->is_jrt(), "No java runtime image present");
790 _jrt_entry = new_entry;
791 ++_num_entries;
792 #if INCLUDE_CDS
793 if (DumpSharedSpaces) {
794 JImageFile *jimage = _jrt_entry->jimage();
795 assert(jimage != NULL, "No java runtime image file present");
796 ClassLoader::initialize_module_loader_map(jimage);
797 }
798 #endif
799 }
800 } else {
801 // If path does not exist, exit
802 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
803 }
804 set_base_piece = false;
805 } else {
806 // Every entry on the system boot class path after the initial base piece,
807 // which is set by os::set_boot_path(), is considered an appended entry.
808 update_class_path_entry_list(path, false, bootstrap_search);
809 }
810
811 #if INCLUDE_CDS
812 if (DumpSharedSpaces) {
813 check_shared_classpath(path);
814 }
815 #endif
816 while (class_path[end] == os::path_separator()[0]) {
817 end++;
818 }
819 }
820 }
821
822 // During an exploded modules build, each module defined to the boot loader
823 // will be added to the ClassLoader::_exploded_entries array.
824 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) {
825 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
826 assert(_exploded_entries != NULL, "_exploded_entries was not initialized");
827
828 // Find the module's symbol
829 ResourceMark rm(THREAD);
830 const char *module_name = module_sym->as_C_string();
831 const char *home = Arguments::get_java_home();
832 const char file_sep = os::file_separator()[0];
833 // 10 represents the length of "modules" + 2 file separators + \0
834 size_t len = strlen(home) + strlen(module_name) + 10;
835 char *path = NEW_C_HEAP_ARRAY(char, len, mtModule);
836 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
837
838 struct stat st;
839 if (os::stat(path, &st) == 0) {
840 // Directory found
841 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
842
843 // If the path specification is valid, enter it into this module's list.
844 // There is no need to check for duplicate modules in the exploded entry list,
845 // since no two modules with the same name can be defined to the boot loader.
846 // This is checked at module definition time in Modules::define_module.
847 if (new_entry != NULL) {
848 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
849 module_cpl->add_to_list(new_entry);
850 {
851 MutexLocker ml(Module_lock, THREAD);
852 _exploded_entries->push(module_cpl);
853 }
854 log_info(class, load)("path: %s", path);
855 }
856 }
857 FREE_C_HEAP_ARRAY(char, path);
858 }
859
860 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
861 bool throw_exception,
862 bool is_boot_append, TRAPS) {
863 JavaThread* thread = JavaThread::current();
864 ClassPathEntry* new_entry = NULL;
865 if ((st->st_mode & S_IFMT) == S_IFREG) {
866 ResourceMark rm(thread);
867 // Regular file, should be a zip or jimage file
868 // Canonicalized filename
869 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
870 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
871 // This matches the classic VM
872 if (throw_exception) {
873 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
874 } else {
875 return NULL;
876 }
877 }
878 jint error;
879 JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
880 if (jimage != NULL) {
881 new_entry = new ClassPathImageEntry(jimage, canonical_path);
882 } else {
883 char* error_msg = NULL;
884 jzfile* zip;
885 {
886 // enable call to C land
887 ThreadToNativeFromVM ttn(thread);
888 HandleMark hm(thread);
889 zip = (*ZipOpen)(canonical_path, &error_msg);
890 }
891 if (zip != NULL && error_msg == NULL) {
892 new_entry = new ClassPathZipEntry(zip, path, is_boot_append);
893 } else {
894 char *msg;
895 if (error_msg == NULL) {
896 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ;
897 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
898 } else {
899 int len = (int)(strlen(path) + strlen(error_msg) + 128);
900 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ;
901 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
902 }
903 // Don't complain about bad jar files added via -Xbootclasspath/a:.
904 if (throw_exception && is_init_completed()) {
905 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
906 } else {
907 return NULL;
908 }
909 }
910 }
911 log_info(class, path)("opened: %s", path);
912 log_info(class, load)("opened: %s", path);
913 } else {
914 // Directory
915 new_entry = new ClassPathDirEntry(path);
916 log_info(class, load)("path: %s", path);
917 }
918 return new_entry;
919 }
920
921
922 // Create a class path zip entry for a given path (return NULL if not found
923 // or zip/JAR file cannot be opened)
924 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
925 // check for a regular file
926 struct stat st;
927 if (os::stat(path, &st) == 0) {
928 if ((st.st_mode & S_IFMT) == S_IFREG) {
929 char canonical_path[JVM_MAXPATHLEN];
930 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
931 char* error_msg = NULL;
932 jzfile* zip;
933 {
934 // enable call to C land
935 JavaThread* thread = JavaThread::current();
936 ThreadToNativeFromVM ttn(thread);
937 HandleMark hm(thread);
938 zip = (*ZipOpen)(canonical_path, &error_msg);
939 }
940 if (zip != NULL && error_msg == NULL) {
941 // create using canonical path
942 return new ClassPathZipEntry(zip, canonical_path, is_boot_append);
943 }
944 }
945 }
946 }
947 return NULL;
948 }
949
950 // returns true if entry already on class path
951 bool ClassLoader::contains_append_entry(const char* name) {
952 ClassPathEntry* e = _first_append_entry;
953 while (e != NULL) {
954 // assume zip entries have been canonicalized
955 if (strcmp(name, e->name()) == 0) {
956 return true;
957 }
958 e = e->next();
959 }
960 return false;
961 }
962
963 void ClassLoader::add_to_list(ClassPathEntry *new_entry) {
964 if (new_entry != NULL) {
965 if (_last_append_entry == NULL) {
966 assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty");
967 _first_append_entry = _last_append_entry = new_entry;
968 } else {
969 _last_append_entry->set_next(new_entry);
970 _last_append_entry = new_entry;
971 }
972 }
973 _num_entries++;
974 }
975
976 void ClassLoader::add_to_list(const char *apath) {
977 update_class_path_entry_list((char*)apath, false, false);
978 }
979
980 // Returns true IFF the file/dir exists and the entry was successfully created.
981 bool ClassLoader::update_class_path_entry_list(const char *path,
982 bool check_for_duplicates,
983 bool is_boot_append,
984 bool throw_exception) {
985 struct stat st;
986 if (os::stat(path, &st) == 0) {
987 // File or directory found
988 ClassPathEntry* new_entry = NULL;
989 Thread* THREAD = Thread::current();
990 new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false));
991 if (new_entry == NULL) {
992 return false;
993 }
994
995 // Do not reorder the bootclasspath which would break get_system_package().
996 // Add new entry to linked list
997 if (!check_for_duplicates || !contains_append_entry(new_entry->name())) {
998 ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry);
999 }
1000 return true;
1001 } else {
1002 #if INCLUDE_CDS
1003 if (DumpSharedSpaces) {
1004 _shared_paths_misc_info->add_nonexist_path(path);
1005 }
1006 #endif
1007 return false;
1008 }
1009 }
1010
1011 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
1012 ResourceMark rm;
1013 int num_of_entries = module_list->length();
1014 for (int i = 0; i < num_of_entries; i++) {
1015 ClassPathEntry* e;
1016 ModuleClassPathList* mpl = module_list->at(i);
1017 tty->print("%s=", mpl->module_name()->as_C_string());
1018 e = mpl->module_first_entry();
1019 while (e != NULL) {
1020 tty->print("%s", e->name());
1021 e = e->next();
1022 if (e != NULL) {
1023 tty->print("%s", os::path_separator());
1024 }
1025 }
1026 tty->print(" ;");
1027 }
1028 }
1029
1030 void ClassLoader::print_bootclasspath() {
1031 ClassPathEntry* e;
1032 tty->print("[bootclasspath= ");
1033
1034 // Print --patch-module module/path specifications first
1035 if (_patch_mod_entries != NULL) {
1036 print_module_entry_table(_patch_mod_entries);
1037 }
1038
1039 // [jimage | exploded modules build]
1040 if (has_jrt_entry()) {
1041 // Print the location of the java runtime image
1042 tty->print("%s ;", _jrt_entry->name());
1043 } else {
1044 // Print exploded module build path specifications
1045 if (_exploded_entries != NULL) {
1046 print_module_entry_table(_exploded_entries);
1047 }
1048 }
1049
1050 // appended entries
1051 e = _first_append_entry;
1052 while (e != NULL) {
1053 tty->print("%s ;", e->name());
1054 e = e->next();
1055 }
1056 tty->print_cr("]");
1057 }
1058
1059 void ClassLoader::load_zip_library() {
1060 assert(ZipOpen == NULL, "should not load zip library twice");
1061 // First make sure native library is loaded
1062 os::native_java_library();
1063 // Load zip library
1064 char path[JVM_MAXPATHLEN];
1065 char ebuf[1024];
1066 void* handle = NULL;
1067 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
1068 handle = os::dll_load(path, ebuf, sizeof ebuf);
1069 }
1070 if (handle == NULL) {
1071 vm_exit_during_initialization("Unable to load ZIP library", path);
1072 }
1073 // Lookup zip entry points
1074 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
1075 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
1076 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
1077 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
1078 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
1079 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
1080 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
1081
1082 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
1083 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
1084 GetNextEntry == NULL || Crc32 == NULL) {
1085 vm_exit_during_initialization("Corrupted ZIP library", path);
1086 }
1087
1088 if (ZipInflateFully == NULL) {
1089 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
1090 }
1091
1092 // Lookup canonicalize entry in libjava.dll
1093 void *javalib_handle = os::native_java_library();
1094 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
1095 // This lookup only works on 1.3. Do not check for non-null here
1096 }
1097
1098 void ClassLoader::load_jimage_library() {
1099 // First make sure native library is loaded
1100 os::native_java_library();
1101 // Load jimage library
1102 char path[JVM_MAXPATHLEN];
1103 char ebuf[1024];
1104 void* handle = NULL;
1105 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
1106 handle = os::dll_load(path, ebuf, sizeof ebuf);
1107 }
1108 if (handle == NULL) {
1109 vm_exit_during_initialization("Unable to load jimage library", path);
1110 }
1111
1112 // Lookup jimage entry points
1113 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open"));
1114 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found");
1115 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close"));
1116 guarantee(JImageClose != NULL, "function JIMAGE_Close not found");
1117 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule"));
1118 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found");
1119 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource"));
1120 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found");
1121 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource"));
1122 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found");
1123 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator"));
1124 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found");
1125 JImageResourcePath = CAST_TO_FN_PTR(JImage_ResourcePath_t, os::dll_lookup(handle, "JIMAGE_ResourcePath"));
1126 guarantee(JImageResourcePath != NULL, "function JIMAGE_ResourcePath not found");
1127 }
1128
1129 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
1130 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
1131 }
1132
1133 int ClassLoader::crc32(int crc, const char* buf, int len) {
1134 assert(Crc32 != NULL, "ZIP_CRC32 is not found");
1135 return (*Crc32)(crc, (const jbyte*)buf, len);
1136 }
1137
1138 #if INCLUDE_CDS
1139 void ClassLoader::initialize_module_loader_map(JImageFile* jimage) {
1140 if (!DumpSharedSpaces) {
1141 return; // only needed for CDS dump time
1142 }
1143
1144 ResourceMark rm;
1145 jlong size;
1146 JImageLocationRef location = (*JImageFindResource)(jimage, JAVA_BASE_NAME, get_jimage_version_string(), MODULE_LOADER_MAP, &size);
1147 if (location == 0) {
1148 vm_exit_during_initialization(
1149 "Cannot find ModuleLoaderMap location from modules jimage.", NULL);
1150 }
1151 char* buffer = NEW_RESOURCE_ARRAY(char, size + 1);
1152 buffer[size] = '\0';
1153 jlong read = (*JImageGetResource)(jimage, location, buffer, size);
1154 if (read != size) {
1155 vm_exit_during_initialization(
1156 "Cannot find ModuleLoaderMap resource from modules jimage.", NULL);
1157 }
1158 char* char_buf = (char*)buffer;
1159 int buflen = (int)strlen(char_buf);
1160 char* begin_ptr = char_buf;
1161 char* end_ptr = strchr(begin_ptr, '\n');
1162 bool process_boot_modules = false;
1163 _boot_modules_array = new (ResourceObj::C_HEAP, mtModule)
1164 GrowableArray<char*>(INITIAL_BOOT_MODULES_ARRAY_SIZE, true);
1165 _platform_modules_array = new (ResourceObj::C_HEAP, mtModule)
1166 GrowableArray<char*>(INITIAL_PLATFORM_MODULES_ARRAY_SIZE, true);
1167 while (end_ptr != NULL && (end_ptr - char_buf) < buflen) {
1168 // Allocate a buffer from the C heap to be appended to the _boot_modules_array
1169 // or the _platform_modules_array.
1170 char* temp_name = NEW_C_HEAP_ARRAY(char, (size_t)(end_ptr - begin_ptr + 1), mtInternal);
1171 strncpy(temp_name, begin_ptr, end_ptr - begin_ptr);
1172 temp_name[end_ptr - begin_ptr] = '\0';
1173 if (strncmp(temp_name, "BOOT", 4) == 0) {
1174 process_boot_modules = true;
1175 FREE_C_HEAP_ARRAY(char, temp_name);
1176 } else if (strncmp(temp_name, "PLATFORM", 8) == 0) {
1177 process_boot_modules = false;
1178 FREE_C_HEAP_ARRAY(char, temp_name);
1179 } else {
1180 // module name
1181 if (process_boot_modules) {
1182 _boot_modules_array->append(temp_name);
1183 } else {
1184 _platform_modules_array->append(temp_name);
1185 }
1186 }
1187 begin_ptr = ++end_ptr;
1188 end_ptr = strchr(begin_ptr, '\n');
1189 }
1190 }
1191 #endif
1192
1193 // Function add_package extracts the package from the fully qualified class name
1194 // and checks if the package is in the boot loader's package entry table. If so,
1195 // then it sets the classpath_index in the package entry record.
1196 //
1197 // The classpath_index field is used to find the entry on the boot loader class
1198 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
1199 // in an unnamed module. It is also used to indicate (for all packages whose
1200 // classes are loaded by the boot loader) that at least one of the package's
1201 // classes has been loaded.
1202 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) {
1203 assert(fullq_class_name != NULL, "just checking");
1204
1205 // Get package name from fully qualified class name.
1206 ResourceMark rm;
1207 const char *cp = package_from_name(fullq_class_name);
1208 if (cp != NULL) {
1209 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();
1210 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp, CHECK_false);
1211 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol);
1212 if (pkg_entry != NULL) {
1213 assert(classpath_index != -1, "Unexpected classpath_index");
1214 pkg_entry->set_classpath_index(classpath_index);
1215 } else {
1216 return false;
1217 }
1218 }
1219 return true;
1220 }
1221
1222 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1223 // Look up the name in the boot loader's package entry table.
1224 if (name != NULL) {
1225 TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL);
1226 // Look for the package entry in the boot loader's package entry table.
1227 PackageEntry* package =
1228 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1229
1230 // Return NULL if package does not exist or if no classes in that package
1231 // have been loaded.
1232 if (package != NULL && package->has_loaded_class()) {
1233 ModuleEntry* module = package->module();
1234 if (module->location() != NULL) {
1235 ResourceMark rm(THREAD);
1236 Handle ml = java_lang_String::create_from_str(
1237 module->location()->as_C_string(), THREAD);
1238 return ml();
1239 }
1240 // Return entry on boot loader class path.
1241 Handle cph = java_lang_String::create_from_str(
1242 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1243 return cph();
1244 }
1245 }
1246 return NULL;
1247 }
1248
1249 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1250 ResourceMark rm(THREAD);
1251 // List of pointers to PackageEntrys that have loaded classes.
1252 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
1253 {
1254 MutexLocker ml(Module_lock, THREAD);
1255
1256 PackageEntryTable* pe_table =
1257 ClassLoaderData::the_null_class_loader_data()->packages();
1258
1259 // Collect the packages that have at least one loaded class.
1260 for (int x = 0; x < pe_table->table_size(); x++) {
1261 for (PackageEntry* package_entry = pe_table->bucket(x);
1262 package_entry != NULL;
1263 package_entry = package_entry->next()) {
1264 if (package_entry->has_loaded_class()) {
1265 loaded_class_pkgs->append(package_entry);
1266 }
1267 }
1268 }
1269 }
1270
1271
1272 // Allocate objArray and fill with java.lang.String
1273 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1274 loaded_class_pkgs->length(), CHECK_NULL);
1275 objArrayHandle result(THREAD, r);
1276 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1277 PackageEntry* package_entry = loaded_class_pkgs->at(x);
1278 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1279 result->obj_at_put(x, str());
1280 }
1281 return result();
1282 }
1283
1284 #if INCLUDE_CDS
1285 s2 ClassLoader::module_to_classloader(const char* module_name) {
1286
1287 assert(DumpSharedSpaces, "dump time only");
1288 assert(_boot_modules_array != NULL, "_boot_modules_array is NULL");
1289 assert(_platform_modules_array != NULL, "_platform_modules_array is NULL");
1290
1291 int array_size = _boot_modules_array->length();
1292 for (int i = 0; i < array_size; i++) {
1293 if (strcmp(module_name, _boot_modules_array->at(i)) == 0) {
1294 return BOOT_LOADER;
1295 }
1296 }
1297
1298 array_size = _platform_modules_array->length();
1299 for (int i = 0; i < array_size; i++) {
1300 if (strcmp(module_name, _platform_modules_array->at(i)) == 0) {
1301 return PLATFORM_LOADER;
1302 }
1303 }
1304
1305 return APP_LOADER;
1306 }
1307
1308 s2 ClassLoader::classloader_type(Symbol* class_name, ClassPathEntry* e, int classpath_index, TRAPS) {
1309 assert(DumpSharedSpaces, "Only used for CDS dump time");
1310
1311 // obtain the classloader type based on the class name.
1312 // First obtain the package name based on the class name. Then obtain
1313 // the classloader type based on the package name from the jimage using
1314 // a jimage API. If the classloader type cannot be found from the
1315 // jimage, it is determined by the class path entry.
1316 jshort loader_type = ClassLoader::APP_LOADER;
1317 if (e->is_jrt()) {
1318 ResourceMark rm;
1319 TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK_0);
1320 if (pkg_name != NULL) {
1321 const char* pkg_name_C_string = (const char*)(pkg_name->as_C_string());
1322 ClassPathImageEntry* cpie = (ClassPathImageEntry*)e;
1323 JImageFile* jimage = cpie->jimage();
1324 char* module_name = (char*)(*JImagePackageToModule)(jimage, pkg_name_C_string);
1325 if (module_name != NULL) {
1326 loader_type = ClassLoader::module_to_classloader(module_name);
1327 }
1328 }
1329 } else if (ClassLoaderExt::is_boot_classpath(classpath_index)) {
1330 loader_type = ClassLoader::BOOT_LOADER;
1331 }
1332 return loader_type;
1333 }
1334 #endif
1335
1336 // caller needs ResourceMark
1337 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1338 int class_name_len) {
1339 assert(class_name != NULL, "invariant");
1340 assert((int)strlen(class_name) == class_name_len, "invariant");
1341
1342 static const char class_suffix[] = ".class";
1343
1344 char* const file_name = NEW_RESOURCE_ARRAY(char,
1345 class_name_len +
1346 sizeof(class_suffix)); // includes term NULL
1347
1348 strncpy(file_name, class_name, class_name_len);
1349 strncpy(&file_name[class_name_len], class_suffix, sizeof(class_suffix));
1350
1351 return file_name;
1352 }
1353
1354 ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
1355 const GrowableArray<ModuleClassPathList*>* const module_list) {
1356 int num_of_entries = module_list->length();
1357 const Symbol* class_module_name = mod_entry->name();
1358
1359 // Loop through all the modules in either the patch-module or exploded entries looking for module
1360 for (int i = 0; i < num_of_entries; i++) {
1361 ModuleClassPathList* module_cpl = module_list->at(i);
1362 Symbol* module_cpl_name = module_cpl->module_name();
1363
1364 if (module_cpl_name->fast_compare(class_module_name) == 0) {
1365 // Class' module has been located.
1366 return module_cpl->module_first_entry();
1367 }
1368 }
1369 return NULL;
1370 }
1371
1372
1373 // Search either the patch-module or exploded build entries for class.
1374 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list,
1375 const char* const class_name,
1376 const char* const file_name,
1377 TRAPS) {
1378 ClassFileStream* stream = NULL;
1379
1380 // Find the class' defining module in the boot loader's module entry table
1381 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
1382 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL;
1383
1384 // If the module system has not defined java.base yet, then
1385 // classes loaded are assumed to be defined to java.base.
1386 // When java.base is eventually defined by the module system,
1387 // all packages of classes that have been previously loaded
1388 // are verified in ModuleEntryTable::verify_javabase_packages().
1389 if (!Universe::is_module_initialized() &&
1390 !ModuleEntryTable::javabase_defined() &&
1391 mod_entry == NULL) {
1392 mod_entry = ModuleEntryTable::javabase_moduleEntry();
1393 }
1394
1395 // The module must be a named module
1396 ClassPathEntry* e = NULL;
1397 if (mod_entry != NULL && mod_entry->is_named()) {
1398 if (module_list == _exploded_entries) {
1399 // The exploded build entries can be added to at any time so a lock is
1400 // needed when searching them.
1401 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
1402 MutexLocker ml(Module_lock, THREAD);
1403 e = find_first_module_cpe(mod_entry, module_list);
1404 } else {
1405 e = find_first_module_cpe(mod_entry, module_list);
1406 }
1407 }
1408
1409 // Try to load the class from the module's ClassPathEntry list.
1410 while (e != NULL) {
1411 stream = e->open_stream(file_name, CHECK_NULL);
1412 // No context.check is required since CDS is not supported
1413 // for an exploded modules build or if --patch-module is specified.
1414 if (NULL != stream) {
1415 return stream;
1416 }
1417 e = e->next();
1418 }
1419 // If the module was located, break out even if the class was not
1420 // located successfully from that module's ClassPathEntry list.
1421 // There will not be another valid entry for that module.
1422 return NULL;
1423 }
1424
1425 InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1426 assert(name != NULL, "invariant");
1427 assert(THREAD->is_Java_thread(), "must be a JavaThread");
1428
1429 ResourceMark rm(THREAD);
1430 HandleMark hm(THREAD);
1431
1432 const char* const class_name = name->as_C_string();
1433
1434 EventMark m("loading class %s", class_name);
1435 ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion);
1436
1437 const char* const file_name = file_name_for_class_name(class_name,
1438 name->utf8_length());
1439 assert(file_name != NULL, "invariant");
1440
1441 ClassLoaderExt::Context context(class_name, file_name, THREAD);
1442
1443 // Lookup stream for parsing .class file
1444 ClassFileStream* stream = NULL;
1445 s2 classpath_index = 0;
1446 ClassPathEntry* e = NULL;
1447
1448 // If DumpSharedSpaces is true boot loader visibility boundaries are set to:
1449 // - [jimage] + [_first_append_entry to _last_append_entry] (all path entries).
1450 //
1451 // If search_append_only is true, boot loader visibility boundaries are
1452 // set to be _first_append_entry to the end. This includes:
1453 // [-Xbootclasspath/a]; [jvmti appended entries]
1454 //
1455 // If both DumpSharedSpaces and search_append_only are false, boot loader
1456 // visibility boundaries are set to be the --patch-module entries plus the base piece.
1457 // This would include:
1458 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1459 //
1460 // DumpSharedSpaces and search_append_only are mutually exclusive and cannot
1461 // be true at the same time.
1462 assert(!(DumpSharedSpaces && search_append_only), "DumpSharedSpaces and search_append_only are both true");
1463
1464 // Load Attempt #1: --patch-module
1465 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1466 // attempt to load the class from those locations specific to the module.
1467 // Specifications to --patch-module can contain a partial number of classes
1468 // that are part of the overall module definition. So if a particular class is not
1469 // found within its module specification, the search should continue to Load Attempt #2.
1470 // Note: The --patch-module entries are never searched if the boot loader's
1471 // visibility boundary is limited to only searching the append entries.
1472 if (_patch_mod_entries != NULL && !search_append_only) {
1473 // At CDS dump time, the --patch-module entries are ignored. That means a
1474 // class is still loaded from the runtime image even if it might
1475 // appear in the _patch_mod_entries. The runtime shared class visibility
1476 // check will determine if a shared class is visible based on the runtime
1477 // environemnt, including the runtime --patch-module setting.
1478 if (!DumpSharedSpaces) {
1479 stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL);
1480 }
1481 }
1482
1483 // Load Attempt #2: [jimage | exploded build]
1484 if (!search_append_only && (NULL == stream)) {
1485 if (has_jrt_entry()) {
1486 e = _jrt_entry;
1487 stream = _jrt_entry->open_stream(file_name, CHECK_NULL);
1488 if (!context.check(stream, classpath_index)) {
1489 return NULL;
1490 }
1491 } else {
1492 // Exploded build - attempt to locate class in its defining module's location.
1493 assert(_exploded_entries != NULL, "No exploded build entries present");
1494 stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL);
1495 }
1496 }
1497
1498 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1499 if ((search_append_only || DumpSharedSpaces) && (NULL == stream)) {
1500 // For the boot loader append path search, the starting classpath_index
1501 // for the appended piece is always 1 to account for either the
1502 // _jrt_entry or the _exploded_entries.
1503 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1504 classpath_index = 1;
1505
1506 e = _first_append_entry;
1507 while (e != NULL) {
1508 stream = e->open_stream(file_name, CHECK_NULL);
1509 if (!context.check(stream, classpath_index)) {
1510 return NULL;
1511 }
1512 if (NULL != stream) {
1513 break;
1514 }
1515 e = e->next();
1516 ++classpath_index;
1517 }
1518 }
1519
1520 if (NULL == stream) {
1521 if (DumpSharedSpaces) {
1522 tty->print_cr("Preload Warning: Cannot find %s", class_name);
1523 }
1524 return NULL;
1525 }
1526
1527 stream->set_verify(context.should_verify(classpath_index));
1528
1529 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1530 Handle protection_domain;
1531
1532 InstanceKlass* result = KlassFactory::create_from_stream(stream,
1533 name,
1534 loader_data,
1535 protection_domain,
1536 NULL, // host_klass
1537 NULL, // cp_patches
1538 THREAD);
1539 if (HAS_PENDING_EXCEPTION) {
1540 if (DumpSharedSpaces) {
1541 tty->print_cr("Preload Error: Failed to load %s", class_name);
1542 }
1543 return NULL;
1544 }
1545
1546 return context.record_result(name, e, classpath_index, result, THREAD);
1547 }
1548
1549 // Initialize the class loader's access to methods in libzip. Parse and
1550 // process the boot classpath into a list ClassPathEntry objects. Once
1551 // this list has been created, it must not change order (see class PackageInfo)
1552 // it can be appended to and is by jvmti and the kernel vm.
1553
1554 void ClassLoader::initialize() {
1555 EXCEPTION_MARK;
1556
1557 if (UsePerfData) {
1558 // jvmstat performance counters
1559 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1560 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1561 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1562 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1563 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1564 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1565 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1566 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1567 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1568 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1569
1570 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1571 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1572 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1573 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1574 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1575 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1576 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1577 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1578 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1579 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1580 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1581 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1582 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1583
1584
1585 // The following performance counters are added for measuring the impact
1586 // of the bug fix of 6365597. They are mainly focused on finding out
1587 // the behavior of system & user-defined classloader lock, whether
1588 // ClassLoader.loadClass/findClass is being called synchronized or not.
1589 // Also two additional counters are created to see whether 'UnsyncloadClass'
1590 // flag is being set or not and how many times load_instance_class call
1591 // fails with linkageError etc.
1592 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1593 "systemLoaderLockContentionRate");
1594 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1595 "nonSystemLoaderLockContentionRate");
1596 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1597 "jvmFindLoadedClassNoLockCalls");
1598 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1599 "jvmDefineClassNoLockCalls");
1600
1601 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1602 "jniDefineClassNoLockCalls");
1603
1604 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1605 "unsafeDefineClassCalls");
1606
1607 NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet");
1608 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1609 "loadInstanceClassFailRate");
1610
1611 // increment the isUnsyncloadClass counter if UnsyncloadClass is set.
1612 if (UnsyncloadClass) {
1613 _isUnsyncloadClass->inc();
1614 }
1615 }
1616
1617 // lookup zip library entry points
1618 load_zip_library();
1619 // lookup jimage library entry points
1620 load_jimage_library();
1621 #if INCLUDE_CDS
1622 // initialize search path
1623 if (DumpSharedSpaces) {
1624 _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
1625 }
1626 #endif
1627 setup_bootstrap_search_path();
1628 }
1629
1630 #if INCLUDE_CDS
1631 void ClassLoader::initialize_shared_path() {
1632 if (DumpSharedSpaces) {
1633 ClassLoaderExt::setup_search_paths();
1634 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1635 }
1636 }
1637 #endif
1638
1639 jlong ClassLoader::classloader_time_ms() {
1640 return UsePerfData ?
1641 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1642 }
1643
1644 jlong ClassLoader::class_init_count() {
1645 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1646 }
1647
1648 jlong ClassLoader::class_init_time_ms() {
1649 return UsePerfData ?
1650 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1651 }
1652
1653 jlong ClassLoader::class_verify_time_ms() {
1654 return UsePerfData ?
1655 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1656 }
1657
1658 jlong ClassLoader::class_link_count() {
1659 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1660 }
1661
1662 jlong ClassLoader::class_link_time_ms() {
1663 return UsePerfData ?
1664 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1665 }
1666
1667 int ClassLoader::compute_Object_vtable() {
1668 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1669 // code to determine actual value from file
1670 // Would be value '11' if finals were in vtable
1671 int JDK_1_2_Object_vtable_size = 5;
1672 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1673 }
1674
1675
1676 void classLoader_init1() {
1677 ClassLoader::initialize();
1678 }
1679
1680 // Complete the ClassPathEntry setup for the boot loader
1681 void ClassLoader::classLoader_init2(TRAPS) {
1682 // Setup the list of module/path pairs for --patch-module processing
1683 // This must be done after the SymbolTable is created in order
1684 // to use fast_compare on module names instead of a string compare.
1685 if (Arguments::get_patch_mod_prefix() != NULL) {
1686 setup_patch_mod_entries();
1687 }
1688
1689 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
1690 // to successfully determine if java.base has been patched)
1691 create_javabase();
1692
1693 // Setup the initial java.base/path pair for the exploded build entries.
1694 // As more modules are defined during module system initialization, more
1695 // entries will be added to the exploded build array.
1696 if (!has_jrt_entry()) {
1697 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds");
1698 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds");
1699 // Set up the boot loader's _exploded_entries list. Note that this gets
1700 // done before loading any classes, by the same thread that will
1701 // subsequently do the first class load. So, no lock is needed for this.
1702 assert(_exploded_entries == NULL, "Should only get initialized once");
1703 _exploded_entries = new (ResourceObj::C_HEAP, mtModule)
1704 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true);
1705 add_to_exploded_build_list(vmSymbols::java_base(), CHECK);
1706 }
1707 }
1708
1709
1710 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1711 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1712 if (CanonicalizeEntry != NULL) {
1713 JavaThread* THREAD = JavaThread::current();
1714 JNIEnv* env = THREAD->jni_environment();
1715 ResourceMark rm(THREAD);
1716
1717 // os::native_path writes into orig_copy
1718 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1719 strcpy(orig_copy, orig);
1720 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1721 return false;
1722 }
1723 } else {
1724 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1725 strncpy(out, orig, len);
1726 out[len - 1] = '\0';
1727 }
1728 return true;
1729 }
1730
1731 void ClassLoader::create_javabase() {
1732 Thread* THREAD = Thread::current();
1733
1734 // Create java.base's module entry for the boot
1735 // class loader prior to loading j.l.Ojbect.
1736 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1737
1738 // Get module entry table
1739 ModuleEntryTable* null_cld_modules = null_cld->modules();
1740 if (null_cld_modules == NULL) {
1741 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1742 }
1743
1744 {
1745 MutexLocker ml(Module_lock, THREAD);
1746 ModuleEntry* jb_module = null_cld_modules->locked_create_entry_or_null(Handle(),
1747 false, vmSymbols::java_base(), NULL, NULL, null_cld);
1748 if (jb_module == NULL) {
1749 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
1750 }
1751 ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1752 }
1753 }
1754
1755 #ifndef PRODUCT
1756
1757 // CompileTheWorld
1758 //
1759 // Iterates over all class path entries and forces compilation of all methods
1760 // in all classes found. Currently, only zip/jar archives are searched.
1761 //
1762 // The classes are loaded by the Java level bootstrap class loader, and the
1763 // initializer is called. If DelayCompilationDuringStartup is true (default),
1764 // the interpreter will run the initialization code. Note that forcing
1765 // initialization in this way could potentially lead to initialization order
1766 // problems, in which case we could just force the initialization bit to be set.
1767
1768
1769 // We need to iterate over the contents of a zip/jar file, so we replicate the
1770 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1771 // since jzfile already has a void* definition.
1772 //
1773 // Note that this is only used in debug mode.
1774 //
1775 // HotSpot integration note:
1776 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1777
1778
1779 // JDK 1.3 version
1780 typedef struct real_jzentry { /* Zip file entry */
1781 char *name; /* entry name */
1782 jint time; /* modification time */
1783 jint size; /* size of uncompressed data */
1784 jint csize; /* size of compressed data (zero if uncompressed) */
1785 jint crc; /* crc of uncompressed data */
1786 char *comment; /* optional zip file comment */
1787 jbyte *extra; /* optional extra data */
1788 jint pos; /* position of LOC header (if negative) or data */
1789 } real_jzentry;
1790
1791 typedef struct real_jzfile { /* Zip file */
1792 char *name; /* zip file name */
1793 jint refs; /* number of active references */
1794 jint fd; /* open file descriptor */
1795 void *lock; /* read lock */
1796 char *comment; /* zip file comment */
1797 char *msg; /* zip error message */
1798 void *entries; /* array of hash cells */
1799 jint total; /* total number of entries */
1800 unsigned short *table; /* Hash chain heads: indexes into entries */
1801 jint tablelen; /* number of hash eads */
1802 real_jzfile *next; /* next zip file in search list */
1803 jzentry *cache; /* we cache the most recently freed jzentry */
1804 /* Information on metadata names in META-INF directory */
1805 char **metanames; /* array of meta names (may have null names) */
1806 jint metacount; /* number of slots in metanames array */
1807 /* If there are any per-entry comments, they are in the comments array */
1808 char **comments;
1809 } real_jzfile;
1810
1811 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1812 // For now we only compile all methods in all classes in zip/jar files
1813 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1814 tty->cr();
1815 }
1816
1817 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1818 real_jzfile* zip = (real_jzfile*) _zip;
1819 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1820 tty->cr();
1821 // Iterate over all entries in zip file
1822 for (int n = 0; ; n++) {
1823 real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n));
1824 if (ze == NULL) break;
1825 ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1826 }
1827 if (HAS_PENDING_EXCEPTION) {
1828 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1829 CLEAR_PENDING_EXCEPTION;
1830 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1831 tty->print_cr("Increase class metadata storage if a limit was set");
1832 } else {
1833 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1834 }
1835 }
1836 }
1837
1838 void ClassLoader::compile_the_world() {
1839 EXCEPTION_MARK;
1840 HandleMark hm(THREAD);
1841 ResourceMark rm(THREAD);
1842
1843 assert(has_jrt_entry(), "Compile The World not supported with exploded module build");
1844
1845 // Find bootstrap loader
1846 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1847 jlong start = os::javaTimeMillis();
1848
1849 // Compile the world for the modular java runtime image
1850 _jrt_entry->compile_the_world(system_class_loader, CATCH);
1851
1852 // Iterate over all bootstrap class path appended entries
1853 ClassPathEntry* e = _first_append_entry;
1854 while (e != NULL) {
1855 assert(!e->is_jrt(), "A modular java runtime image is present on the list of appended entries");
1856 e->compile_the_world(system_class_loader, CATCH);
1857 e = e->next();
1858 }
1859 jlong end = os::javaTimeMillis();
1860 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1861 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1862 {
1863 // Print statistics as if before normal exit:
1864 extern void print_statistics();
1865 print_statistics();
1866 }
1867 vm_exit(0);
1868 }
1869
1870 int ClassLoader::_compile_the_world_class_counter = 0;
1871 int ClassLoader::_compile_the_world_method_counter = 0;
1872 static int _codecache_sweep_counter = 0;
1873
1874 // Filter out all exceptions except OOMs
1875 static void clear_pending_exception_if_not_oom(TRAPS) {
1876 if (HAS_PENDING_EXCEPTION &&
1877 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1878 CLEAR_PENDING_EXCEPTION;
1879 }
1880 // The CHECK at the caller will propagate the exception out
1881 }
1882
1883 /**
1884 * Returns if the given method should be compiled when doing compile-the-world.
1885 *
1886 * TODO: This should be a private method in a CompileTheWorld class.
1887 */
1888 static bool can_be_compiled(methodHandle m, int comp_level) {
1889 assert(CompileTheWorld, "must be");
1890
1891 // It's not valid to compile a native wrapper for MethodHandle methods
1892 // that take a MemberName appendix since the bytecode signature is not
1893 // correct.
1894 vmIntrinsics::ID iid = m->intrinsic_id();
1895 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1896 return false;
1897 }
1898
1899 return CompilationPolicy::can_be_compiled(m, comp_level);
1900 }
1901
1902 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1903 if (string_ends_with(name, ".class")) {
1904 // We have a .class file
1905 int len = (int)strlen(name);
1906 char buffer[2048];
1907 strncpy(buffer, name, len - 6);
1908 buffer[len-6] = 0;
1909 // If the file has a period after removing .class, it's not really a
1910 // valid class file. The class loader will check everything else.
1911 if (strchr(buffer, '.') == NULL) {
1912 _compile_the_world_class_counter++;
1913 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
1914
1915 // Construct name without extension
1916 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
1917 // Use loader to load and initialize class
1918 Klass* k = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
1919 if (k != NULL && !HAS_PENDING_EXCEPTION) {
1920 k->initialize(THREAD);
1921 }
1922 bool exception_occurred = HAS_PENDING_EXCEPTION;
1923 clear_pending_exception_if_not_oom(CHECK);
1924 if (CompileTheWorldPreloadClasses && k != NULL) {
1925 InstanceKlass* ik = InstanceKlass::cast(k);
1926 ConstantPool::preload_and_initialize_all_classes(ik->constants(), THREAD);
1927 if (HAS_PENDING_EXCEPTION) {
1928 // If something went wrong in preloading we just ignore it
1929 clear_pending_exception_if_not_oom(CHECK);
1930 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
1931 }
1932 }
1933
1934 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
1935 if (k == NULL || exception_occurred) {
1936 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
1937 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
1938 } else {
1939 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
1940 // Preload all classes to get around uncommon traps
1941 // Iterate over all methods in class
1942 int comp_level = CompilationPolicy::policy()->initial_compile_level();
1943 InstanceKlass* ik = InstanceKlass::cast(k);
1944 for (int n = 0; n < ik->methods()->length(); n++) {
1945 methodHandle m (THREAD, ik->methods()->at(n));
1946 if (can_be_compiled(m, comp_level)) {
1947 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
1948 // Give sweeper a chance to keep up with CTW
1949 VM_CTWThreshold op;
1950 VMThread::execute(&op);
1951 _codecache_sweep_counter = 0;
1952 }
1953 // Force compilation
1954 CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
1955 methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
1956 if (HAS_PENDING_EXCEPTION) {
1957 clear_pending_exception_if_not_oom(CHECK);
1958 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1959 } else {
1960 _compile_the_world_method_counter++;
1961 }
1962 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
1963 // Clobber the first compile and force second tier compilation
1964 CompiledMethod* nm = m->code();
1965 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1966 // Throw out the code so that the code cache doesn't fill up
1967 nm->make_not_entrant();
1968 }
1969 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
1970 methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
1971 if (HAS_PENDING_EXCEPTION) {
1972 clear_pending_exception_if_not_oom(CHECK);
1973 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1974 } else {
1975 _compile_the_world_method_counter++;
1976 }
1977 }
1978 } else {
1979 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
1980 }
1981
1982 CompiledMethod* nm = m->code();
1983 if (nm != NULL && !m->is_method_handle_intrinsic()) {
1984 // Throw out the code so that the code cache doesn't fill up
1985 nm->make_not_entrant();
1986 }
1987 }
1988 }
1989 }
1990 }
1991 }
1992 }
1993
1994 #endif //PRODUCT
1995
1996 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1997 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1998 void PerfClassTraceTime::initialize() {
1999 if (!UsePerfData) return;
2000
2001 if (_eventp != NULL) {
2002 // increment the event counter
2003 _eventp->inc();
2004 }
2005
2006 // stop the current active thread-local timer to measure inclusive time
2007 _prev_active_event = -1;
2008 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
2009 if (_timers[i].is_active()) {
2010 assert(_prev_active_event == -1, "should have only one active timer");
2011 _prev_active_event = i;
2012 _timers[i].stop();
2013 }
2014 }
2015
2016 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
2017 // start the inclusive timer if not recursively called
2018 _t.start();
2019 }
2020
2021 // start thread-local timer of the given event type
2022 if (!_timers[_event_type].is_active()) {
2023 _timers[_event_type].start();
2024 }
2025 }
2026
2027 PerfClassTraceTime::~PerfClassTraceTime() {
2028 if (!UsePerfData) return;
2029
2030 // stop the thread-local timer as the event completes
2031 // and resume the thread-local timer of the event next on the stack
2032 _timers[_event_type].stop();
2033 jlong selftime = _timers[_event_type].ticks();
2034
2035 if (_prev_active_event >= 0) {
2036 _timers[_prev_active_event].start();
2037 }
2038
2039 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
2040
2041 // increment the counters only on the leaf call
2042 _t.stop();
2043 _timep->inc(_t.ticks());
2044 if (_selftimep != NULL) {
2045 _selftimep->inc(selftime);
2046 }
2047 // add all class loading related event selftime to the accumulated time counter
2048 ClassLoader::perf_accumulated_time()->inc(selftime);
2049
2050 // reset the timer
2051 _timers[_event_type].reset();
2052 }