1 /*
2 * Copyright (c) 1997, 2018, 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 "jvm.h"
27 #include "jimage.hpp"
28 #include "classfile/classFileStream.hpp"
29 #include "classfile/classLoader.inline.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/classLoaderExt.hpp"
32 #include "classfile/javaClasses.hpp"
33 #include "classfile/moduleEntry.hpp"
34 #include "classfile/modules.hpp"
35 #include "classfile/packageEntry.hpp"
36 #include "classfile/klassFactory.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/vmSymbols.hpp"
39 #include "compiler/compileBroker.hpp"
40 #include "gc/shared/collectedHeap.inline.hpp"
41 #include "gc/shared/generation.hpp"
42 #include "interpreter/bytecodeStream.hpp"
43 #include "interpreter/oopMapCache.hpp"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "logging/logTag.hpp"
47 #include "memory/allocation.inline.hpp"
48 #include "memory/filemap.hpp"
49 #include "memory/oopFactory.hpp"
50 #include "memory/resourceArea.hpp"
51 #include "memory/universe.hpp"
52 #include "oops/instanceKlass.hpp"
53 #include "oops/instanceRefKlass.hpp"
54 #include "oops/method.inline.hpp"
55 #include "oops/objArrayOop.inline.hpp"
56 #include "oops/oop.inline.hpp"
57 #include "oops/symbol.hpp"
58 #include "prims/jvm_misc.hpp"
59 #include "runtime/arguments.hpp"
60 #include "runtime/compilationPolicy.hpp"
61 #include "runtime/handles.hpp"
62 #include "runtime/handles.inline.hpp"
63 #include "runtime/init.hpp"
64 #include "runtime/interfaceSupport.inline.hpp"
65 #include "runtime/java.hpp"
66 #include "runtime/javaCalls.hpp"
67 #include "runtime/os.inline.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::_load_instance_class_failCounter = NULL;
142
143 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = NULL;
144 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = NULL;
145 ClassPathEntry* ClassLoader::_jrt_entry = NULL;
146 ClassPathEntry* ClassLoader::_first_append_entry = NULL;
147 ClassPathEntry* ClassLoader::_last_append_entry = NULL;
148 #if INCLUDE_CDS
149 ClassPathEntry* ClassLoader::_app_classpath_entries = NULL;
150 ClassPathEntry* ClassLoader::_last_app_classpath_entry = 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 PackageEntry* ClassLoader::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 assert((_dir != NULL) && (name != NULL), "sanity");
264 size_t path_len = strlen(_dir) + strlen(name) + strlen(os::file_separator()) + 1;
265 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, path_len);
266 int len = jio_snprintf(path, path_len, "%s%s%s", _dir, os::file_separator(), name);
267 assert(len == (int)(path_len - 1), "sanity");
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, path_len);
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, path_len);
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 const char* version_entry = "META-INF/versions/";
383 // 10 is the max length of a decimal 32-bit non-negative number
384 // 2 includes the '/' and trailing zero
385 size_t entry_name_len = strlen(version_entry) + 10 + strlen(name) + 2;
386 char* entry_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, entry_name_len);
387 if (version > 0) {
388 n = jio_snprintf(entry_name, entry_name_len, "%s%d/%s", version_entry, version, name);
389 entry_name[n] = '\0';
390 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
391 if (buffer == NULL) {
392 warning("Could not find %s in %s, try to find highest version instead", entry_name, _zip_name);
393 }
394 }
395 if (buffer == NULL) {
396 for (int i = cur_ver; i >= base_version; i--) {
397 n = jio_snprintf(entry_name, entry_name_len, "%s%d/%s", version_entry, i, name);
398 entry_name[n] = '\0';
399 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
400 if (buffer != NULL) {
401 break;
402 }
403 }
404 }
405 FREE_RESOURCE_ARRAY(char, entry_name, entry_name_len);
406 }
407 }
408 return buffer;
409 }
410
411 bool ClassPathZipEntry::is_multiple_versioned(TRAPS) {
412 assert(DumpSharedSpaces, "called only at dump time");
413 if (_multi_versioned != _unknown) {
414 return (_multi_versioned == _yes) ? true : false;
415 }
416 jint size;
417 char* buffer = (char*)open_entry("META-INF/MANIFEST.MF", &size, true, CHECK_false);
418 if (buffer != NULL) {
419 char* p = buffer;
420 for ( ; *p; ++p) *p = tolower(*p);
421 if (strstr(buffer, "multi-release: true") != NULL) {
422 _multi_versioned = _yes;
423 return true;
424 }
425 }
426 _multi_versioned = _no;
427 return false;
428 }
429 #endif // INCLUDE_CDS
430
431 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
432 jint filesize;
433 u1* buffer = open_versioned_entry(name, &filesize, CHECK_NULL);
434 if (buffer == NULL) {
435 buffer = open_entry(name, &filesize, false, CHECK_NULL);
436 if (buffer == NULL) {
437 return NULL;
438 }
439 }
440 if (UsePerfData) {
441 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
442 }
443 // Resource allocated
444 return new ClassFileStream(buffer,
445 filesize,
446 _zip_name,
447 ClassFileStream::verify);
448 }
449
450 // invoke function for each entry in the zip file
451 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
452 JavaThread* thread = JavaThread::current();
453 HandleMark handle_mark(thread);
454 ThreadToNativeFromVM ttn(thread);
455 for (int n = 0; ; n++) {
456 jzentry * ze = ((*GetNextEntry)(_zip, n));
457 if (ze == NULL) break;
458 (*f)(ze->name, context);
459 }
460 }
461
462 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
463 ClassPathEntry(),
464 _jimage(jimage) {
465 guarantee(jimage != NULL, "jimage file is null");
466 guarantee(name != NULL, "jimage file name is null");
467 size_t len = strlen(name) + 1;
468 _name = NEW_C_HEAP_ARRAY(const char, len, mtClass);
469 strncpy((char *)_name, name, len);
470 }
471
472 ClassPathImageEntry::~ClassPathImageEntry() {
473 if (_name != NULL) {
474 FREE_C_HEAP_ARRAY(const char, _name);
475 _name = NULL;
476 }
477 if (_jimage != NULL) {
478 (*JImageClose)(_jimage);
479 _jimage = NULL;
480 }
481 }
482
483 // For a class in a named module, look it up in the jimage file using this syntax:
484 // /<module-name>/<package-name>/<base-class>
485 //
486 // Assumptions:
487 // 1. There are no unnamed modules in the jimage file.
488 // 2. A package is in at most one module in the jimage file.
489 //
490 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
491 jlong size;
492 JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size);
493
494 if (location == 0) {
495 ResourceMark rm;
496 const char* pkg_name = ClassLoader::package_from_name(name);
497
498 if (pkg_name != NULL) {
499 if (!Universe::is_module_initialized()) {
500 location = (*JImageFindResource)(_jimage, JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
501 #if INCLUDE_CDS
502 // CDS uses the boot class loader to load classes whose packages are in
503 // modules defined for other class loaders. So, for now, get their module
504 // names from the "modules" jimage file.
505 if (DumpSharedSpaces && location == 0) {
506 const char* module_name = (*JImagePackageToModule)(_jimage, pkg_name);
507 if (module_name != NULL) {
508 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
509 }
510 }
511 #endif
512
513 } else {
514 PackageEntry* package_entry = ClassLoader::get_package_entry(name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
515 if (package_entry != NULL) {
516 ResourceMark rm;
517 // Get the module name
518 ModuleEntry* module = package_entry->module();
519 assert(module != NULL, "Boot classLoader package missing module");
520 assert(module->is_named(), "Boot classLoader package is in unnamed module");
521 const char* module_name = module->name()->as_C_string();
522 if (module_name != NULL) {
523 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
524 }
525 }
526 }
527 }
528 }
529 if (location != 0) {
530 if (UsePerfData) {
531 ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
532 }
533 char* data = NEW_RESOURCE_ARRAY(char, size);
534 (*JImageGetResource)(_jimage, location, data, size);
535 // Resource allocated
536 return new ClassFileStream((u1*)data,
537 (int)size,
538 _name,
539 ClassFileStream::verify);
540 }
541
542 return NULL;
543 }
544
545 JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf,
546 const char* module_name,
547 const char* file_name,
548 jlong &size) {
549 return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size));
550 }
551
552 #ifndef PRODUCT
553 bool ctw_visitor(JImageFile* jimage,
554 const char* module_name, const char* version, const char* package,
555 const char* name, const char* extension, void* arg) {
556 if (strcmp(extension, "class") == 0) {
557 Thread* THREAD = Thread::current();
558 ResourceMark rm(THREAD);
559 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JIMAGE_MAX_PATH);
560 jio_snprintf(path, JIMAGE_MAX_PATH - 1, "%s/%s.class", package, name);
561 ClassLoader::compile_the_world_in(path, *(Handle*)arg, THREAD);
562 return !HAS_PENDING_EXCEPTION;
563 }
564 return true;
565 }
566
567 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) {
568 tty->print_cr("CompileTheWorld : Compiling all classes in %s", name());
569 tty->cr();
570 (*JImageResourceIterator)(_jimage, (JImageResourceVisitor_t)ctw_visitor, (void *)&loader);
571 if (HAS_PENDING_EXCEPTION) {
572 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
573 CLEAR_PENDING_EXCEPTION;
574 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
575 tty->print_cr("Increase class metadata storage if a limit was set");
576 } else {
577 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
578 }
579 }
580 }
581 #endif
582
583 bool ClassPathImageEntry::is_modules_image() const {
584 return ClassLoader::is_modules_image(name());
585 }
586
587 #if INCLUDE_CDS
588 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
589 assert(DumpSharedSpaces, "only called at dump time");
590 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure");
591 vm_exit_during_initialization(error, message);
592 }
593 #endif
594
595 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
596 _module_name = module_name;
597 _module_first_entry = NULL;
598 _module_last_entry = NULL;
599 }
600
601 ModuleClassPathList::~ModuleClassPathList() {
602 // Clean out each ClassPathEntry on list
603 ClassPathEntry* e = _module_first_entry;
604 while (e != NULL) {
605 ClassPathEntry* next_entry = e->next();
606 delete e;
607 e = next_entry;
608 }
609 }
610
611 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
612 if (new_entry != NULL) {
613 if (_module_last_entry == NULL) {
614 _module_first_entry = _module_last_entry = new_entry;
615 } else {
616 _module_last_entry->set_next(new_entry);
617 _module_last_entry = new_entry;
618 }
619 }
620 }
621
622 void ClassLoader::trace_class_path(const char* msg, const char* name) {
623 LogTarget(Info, class, path) lt;
624 if (lt.is_enabled()) {
625 LogStream ls(lt);
626 if (msg) {
627 ls.print("%s", msg);
628 }
629 if (name) {
630 if (strlen(name) < 256) {
631 ls.print("%s", name);
632 } else {
633 // For very long paths, we need to print each character separately,
634 // as print_cr() has a length limit
635 while (name[0] != '\0') {
636 ls.print("%c", name[0]);
637 name++;
638 }
639 }
640 }
641 ls.cr();
642 }
643 }
644
645 #if INCLUDE_CDS
646 void ClassLoader::check_shared_classpath(const char *path) {
647 if (strcmp(path, "") == 0) {
648 exit_with_path_failure("Cannot have empty path in archived classpaths", NULL);
649 }
650
651 struct stat st;
652 if (os::stat(path, &st) == 0) {
653 if ((st.st_mode & S_IFMT) != S_IFREG) { // is not a regular file
654 if (!os::dir_is_empty(path)) {
655 tty->print_cr("Error: non-empty directory '%s'", path);
656 exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL);
657 }
658 }
659 }
660 }
661 #endif
662
663 void ClassLoader::setup_bootstrap_search_path() {
664 const char* sys_class_path = Arguments::get_sysclasspath();
665 if (PrintSharedArchiveAndExit) {
666 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
667 // the same as the bootcp of the shared archive.
668 } else {
669 trace_class_path("bootstrap loader class path=", sys_class_path);
670 }
671 #if INCLUDE_CDS
672 if (DumpSharedSpaces) {
673 _shared_paths_misc_info->add_boot_classpath(sys_class_path);
674 }
675 #endif
676 setup_boot_search_path(sys_class_path);
677 }
678
679 #if INCLUDE_CDS
680 int ClassLoader::get_shared_paths_misc_info_size() {
681 return _shared_paths_misc_info->get_used_bytes();
682 }
683
684 void* ClassLoader::get_shared_paths_misc_info() {
685 return _shared_paths_misc_info->buffer();
686 }
687
688 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
689 SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size);
690 bool result = checker->check();
691 delete checker;
692 return result;
693 }
694
695 void ClassLoader::setup_app_search_path(const char *class_path) {
696
697 assert(DumpSharedSpaces, "Sanity");
698
699 Thread* THREAD = Thread::current();
700 int len = (int)strlen(class_path);
701 int end = 0;
702
703 // Iterate over class path entries
704 for (int start = 0; start < len; start = end) {
705 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
706 end++;
707 }
708 EXCEPTION_MARK;
709 ResourceMark rm(THREAD);
710 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
711 strncpy(path, &class_path[start], end - start);
712 path[end - start] = '\0';
713
714 check_shared_classpath(path);
715
716 update_class_path_entry_list(path, false, false);
717
718 while (class_path[end] == os::path_separator()[0]) {
719 end++;
720 }
721 }
722 }
723
724 #endif
725
726 // Construct the array of module/path pairs as specified to --patch-module
727 // for the boot loader to search ahead of the jimage, if the class being
728 // loaded is defined to a module that has been specified to --patch-module.
729 void ClassLoader::setup_patch_mod_entries() {
730 Thread* THREAD = Thread::current();
731 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
732 int num_of_entries = patch_mod_args->length();
733
734
735 // Set up the boot loader's _patch_mod_entries list
736 _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true);
737
738 for (int i = 0; i < num_of_entries; i++) {
739 const char* module_name = (patch_mod_args->at(i))->module_name();
740 Symbol* const module_sym = SymbolTable::lookup(module_name, (int)strlen(module_name), CHECK);
741 assert(module_sym != NULL, "Failed to obtain Symbol for module name");
742 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
743
744 char* class_path = (patch_mod_args->at(i))->path_string();
745 int len = (int)strlen(class_path);
746 int end = 0;
747 // Iterate over the module's class path entries
748 for (int start = 0; start < len; start = end) {
749 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
750 end++;
751 }
752 EXCEPTION_MARK;
753 ResourceMark rm(THREAD);
754 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
755 strncpy(path, &class_path[start], end - start);
756 path[end - start] = '\0';
757
758 struct stat st;
759 if (os::stat(path, &st) == 0) {
760 // File or directory found
761 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
762 // If the path specification is valid, enter it into this module's list
763 if (new_entry != NULL) {
764 module_cpl->add_to_list(new_entry);
765 }
766 }
767
768 while (class_path[end] == os::path_separator()[0]) {
769 end++;
770 }
771 }
772
773 // Record the module into the list of --patch-module entries only if
774 // valid ClassPathEntrys have been created
775 if (module_cpl->module_first_entry() != NULL) {
776 _patch_mod_entries->push(module_cpl);
777 }
778 }
779 }
780
781 // Determine whether the module has been patched via the command-line
782 // option --patch-module
783 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
784 if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) {
785 int table_len = _patch_mod_entries->length();
786 for (int i = 0; i < table_len; i++) {
787 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
788 if (module_name->fast_compare(patch_mod->module_name()) == 0) {
789 return true;
790 }
791 }
792 }
793 return false;
794 }
795
796 // Set up the _jrt_entry if present and boot append path
797 void ClassLoader::setup_boot_search_path(const char *class_path) {
798 int len = (int)strlen(class_path);
799 int end = 0;
800 bool set_base_piece = true;
801
802 #if INCLUDE_CDS
803 if (DumpSharedSpaces) {
804 if (!Arguments::has_jimage()) {
805 vm_exit_during_initialization("CDS is not supported in exploded JDK build", NULL);
806 }
807 }
808 #endif
809
810 // Iterate over class path entries
811 for (int start = 0; start < len; start = end) {
812 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
813 end++;
814 }
815 EXCEPTION_MARK;
816 ResourceMark rm(THREAD);
817 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
818 strncpy(path, &class_path[start], end - start);
819 path[end - start] = '\0';
820
821 if (set_base_piece) {
822 // The first time through the bootstrap_search setup, it must be determined
823 // what the base or core piece of the boot loader search is. Either a java runtime
824 // image is present or this is an exploded module build situation.
825 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
826 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
827 struct stat st;
828 if (os::stat(path, &st) == 0) {
829 // Directory found
830 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
831
832 // Check for a jimage
833 if (Arguments::has_jimage()) {
834 assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice");
835 assert(new_entry != NULL && new_entry->is_modules_image(), "No java runtime image present");
836 _jrt_entry = new_entry;
837 assert(_jrt_entry->jimage() != NULL, "No java runtime image");
838 }
839 } else {
840 // If path does not exist, exit
841 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
842 }
843 set_base_piece = false;
844 } else {
845 // Every entry on the system boot class path after the initial base piece,
846 // which is set by os::set_boot_path(), is considered an appended entry.
847 update_class_path_entry_list(path, false, true);
848 }
849
850 #if INCLUDE_CDS
851 if (DumpSharedSpaces) {
852 check_shared_classpath(path);
853 }
854 #endif
855 while (class_path[end] == os::path_separator()[0]) {
856 end++;
857 }
858 }
859 }
860
861 // During an exploded modules build, each module defined to the boot loader
862 // will be added to the ClassLoader::_exploded_entries array.
863 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) {
864 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
865 assert(_exploded_entries != NULL, "_exploded_entries was not initialized");
866
867 // Find the module's symbol
868 ResourceMark rm(THREAD);
869 const char *module_name = module_sym->as_C_string();
870 const char *home = Arguments::get_java_home();
871 const char file_sep = os::file_separator()[0];
872 // 10 represents the length of "modules" + 2 file separators + \0
873 size_t len = strlen(home) + strlen(module_name) + 10;
874 char *path = NEW_C_HEAP_ARRAY(char, len, mtModule);
875 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
876
877 struct stat st;
878 if (os::stat(path, &st) == 0) {
879 // Directory found
880 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, THREAD);
881 if (HAS_PENDING_EXCEPTION) {
882 FREE_C_HEAP_ARRAY(char, path);
883 return;
884 }
885
886 // If the path specification is valid, enter it into this module's list.
887 // There is no need to check for duplicate modules in the exploded entry list,
888 // since no two modules with the same name can be defined to the boot loader.
889 // This is checked at module definition time in Modules::define_module.
890 if (new_entry != NULL) {
891 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
892 module_cpl->add_to_list(new_entry);
893 {
894 MutexLocker ml(Module_lock, THREAD);
895 _exploded_entries->push(module_cpl);
896 }
897 log_info(class, load)("path: %s", path);
898 }
899 }
900 FREE_C_HEAP_ARRAY(char, path);
901 }
902
903 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
904 bool throw_exception,
905 bool is_boot_append, TRAPS) {
906 JavaThread* thread = JavaThread::current();
907 ClassPathEntry* new_entry = NULL;
908 if ((st->st_mode & S_IFMT) == S_IFREG) {
909 ResourceMark rm(thread);
910 // Regular file, should be a zip or jimage file
911 // Canonicalized filename
912 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
913 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
914 // This matches the classic VM
915 if (throw_exception) {
916 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
917 } else {
918 return NULL;
919 }
920 }
921 jint error;
922 JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
923 if (jimage != NULL) {
924 new_entry = new ClassPathImageEntry(jimage, canonical_path);
925 } else {
926 char* error_msg = NULL;
927 jzfile* zip;
928 {
929 // enable call to C land
930 ThreadToNativeFromVM ttn(thread);
931 HandleMark hm(thread);
932 zip = (*ZipOpen)(canonical_path, &error_msg);
933 }
934 if (zip != NULL && error_msg == NULL) {
935 new_entry = new ClassPathZipEntry(zip, path, is_boot_append);
936 } else {
937 char *msg;
938 if (error_msg == NULL) {
939 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ;
940 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
941 } else {
942 int len = (int)(strlen(path) + strlen(error_msg) + 128);
943 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ;
944 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
945 }
946 // Don't complain about bad jar files added via -Xbootclasspath/a:.
947 if (throw_exception && is_init_completed()) {
948 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
949 } else {
950 return NULL;
951 }
952 }
953 }
954 log_info(class, path)("opened: %s", path);
955 log_info(class, load)("opened: %s", path);
956 } else {
957 // Directory
958 new_entry = new ClassPathDirEntry(path);
959 log_info(class, load)("path: %s", path);
960 }
961 return new_entry;
962 }
963
964
965 // Create a class path zip entry for a given path (return NULL if not found
966 // or zip/JAR file cannot be opened)
967 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
968 // check for a regular file
969 struct stat st;
970 if (os::stat(path, &st) == 0) {
971 if ((st.st_mode & S_IFMT) == S_IFREG) {
972 char canonical_path[JVM_MAXPATHLEN];
973 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
974 char* error_msg = NULL;
975 jzfile* zip;
976 {
977 // enable call to C land
978 JavaThread* thread = JavaThread::current();
979 ThreadToNativeFromVM ttn(thread);
980 HandleMark hm(thread);
981 zip = (*ZipOpen)(canonical_path, &error_msg);
982 }
983 if (zip != NULL && error_msg == NULL) {
984 // create using canonical path
985 return new ClassPathZipEntry(zip, canonical_path, is_boot_append);
986 }
987 }
988 }
989 }
990 return NULL;
991 }
992
993 // returns true if entry already on class path
994 bool ClassLoader::contains_append_entry(const char* name) {
995 ClassPathEntry* e = _first_append_entry;
996 while (e != NULL) {
997 // assume zip entries have been canonicalized
998 if (strcmp(name, e->name()) == 0) {
999 return true;
1000 }
1001 e = e->next();
1002 }
1003 return false;
1004 }
1005
1006 void ClassLoader::add_to_boot_append_entries(ClassPathEntry *new_entry) {
1007 if (new_entry != NULL) {
1008 if (_last_append_entry == NULL) {
1009 assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty");
1010 _first_append_entry = _last_append_entry = new_entry;
1011 } else {
1012 _last_append_entry->set_next(new_entry);
1013 _last_append_entry = new_entry;
1014 }
1015 }
1016 }
1017
1018 // Record the path entries specified in -cp during dump time. The recorded
1019 // information will be used at runtime for loading the archived app classes.
1020 //
1021 // Note that at dump time, ClassLoader::_app_classpath_entries are NOT used for
1022 // loading app classes. Instead, the app class are loaded by the
1023 // jdk/internal/loader/ClassLoaders$AppClassLoader instance.
1024 void ClassLoader::add_to_app_classpath_entries(const char* path,
1025 ClassPathEntry* entry,
1026 bool check_for_duplicates) {
1027 #if INCLUDE_CDS
1028 assert(entry != NULL, "ClassPathEntry should not be NULL");
1029 ClassPathEntry* e = _app_classpath_entries;
1030 if (check_for_duplicates) {
1031 while (e != NULL) {
1032 if (strcmp(e->name(), entry->name()) == 0) {
1033 // entry already exists
1034 return;
1035 }
1036 e = e->next();
1037 }
1038 }
1039
1040 // The entry does not exist, add to the list
1041 if (_app_classpath_entries == NULL) {
1042 assert(_last_app_classpath_entry == NULL, "Sanity");
1043 _app_classpath_entries = _last_app_classpath_entry = entry;
1044 } else {
1045 _last_app_classpath_entry->set_next(entry);
1046 _last_app_classpath_entry = entry;
1047 }
1048
1049 if (entry->is_jar_file()) {
1050 ClassLoaderExt::process_jar_manifest(entry, check_for_duplicates);
1051 } else {
1052 if (!os::dir_is_empty(path)) {
1053 tty->print_cr("Error: non-empty directory '%s'", path);
1054 exit_with_path_failure("Cannot have non-empty directory in app classpaths", NULL);
1055 }
1056 }
1057 #endif
1058 }
1059
1060 // Returns true IFF the file/dir exists and the entry was successfully created.
1061 bool ClassLoader::update_class_path_entry_list(const char *path,
1062 bool check_for_duplicates,
1063 bool is_boot_append,
1064 bool throw_exception) {
1065 struct stat st;
1066 if (os::stat(path, &st) == 0) {
1067 // File or directory found
1068 ClassPathEntry* new_entry = NULL;
1069 Thread* THREAD = Thread::current();
1070 new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false));
1071 if (new_entry == NULL) {
1072 return false;
1073 }
1074
1075 // Do not reorder the bootclasspath which would break get_system_package().
1076 // Add new entry to linked list
1077 if (is_boot_append) {
1078 add_to_boot_append_entries(new_entry);
1079 } else {
1080 add_to_app_classpath_entries(path, new_entry, check_for_duplicates);
1081 }
1082 return true;
1083 } else {
1084 #if INCLUDE_CDS
1085 if (DumpSharedSpaces) {
1086 _shared_paths_misc_info->add_nonexist_path(path);
1087 }
1088 #endif
1089 return false;
1090 }
1091 }
1092
1093 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
1094 ResourceMark rm;
1095 int num_of_entries = module_list->length();
1096 for (int i = 0; i < num_of_entries; i++) {
1097 ClassPathEntry* e;
1098 ModuleClassPathList* mpl = module_list->at(i);
1099 tty->print("%s=", mpl->module_name()->as_C_string());
1100 e = mpl->module_first_entry();
1101 while (e != NULL) {
1102 tty->print("%s", e->name());
1103 e = e->next();
1104 if (e != NULL) {
1105 tty->print("%s", os::path_separator());
1106 }
1107 }
1108 tty->print(" ;");
1109 }
1110 }
1111
1112 void ClassLoader::print_bootclasspath() {
1113 ClassPathEntry* e;
1114 tty->print("[bootclasspath= ");
1115
1116 // Print --patch-module module/path specifications first
1117 if (_patch_mod_entries != NULL) {
1118 print_module_entry_table(_patch_mod_entries);
1119 }
1120
1121 // [jimage | exploded modules build]
1122 if (has_jrt_entry()) {
1123 // Print the location of the java runtime image
1124 tty->print("%s ;", _jrt_entry->name());
1125 } else {
1126 // Print exploded module build path specifications
1127 if (_exploded_entries != NULL) {
1128 print_module_entry_table(_exploded_entries);
1129 }
1130 }
1131
1132 // appended entries
1133 e = _first_append_entry;
1134 while (e != NULL) {
1135 tty->print("%s ;", e->name());
1136 e = e->next();
1137 }
1138 tty->print_cr("]");
1139 }
1140
1141 void ClassLoader::load_zip_library() {
1142 assert(ZipOpen == NULL, "should not load zip library twice");
1143 // First make sure native library is loaded
1144 os::native_java_library();
1145 // Load zip library
1146 char path[JVM_MAXPATHLEN];
1147 char ebuf[1024];
1148 void* handle = NULL;
1149 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
1150 handle = os::dll_load(path, ebuf, sizeof ebuf);
1151 }
1152 if (handle == NULL) {
1153 vm_exit_during_initialization("Unable to load ZIP library", path);
1154 }
1155 // Lookup zip entry points
1156 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
1157 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
1158 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
1159 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
1160 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
1161 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
1162 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
1163
1164 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
1165 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
1166 GetNextEntry == NULL || Crc32 == NULL) {
1167 vm_exit_during_initialization("Corrupted ZIP library", path);
1168 }
1169
1170 if (ZipInflateFully == NULL) {
1171 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
1172 }
1173
1174 // Lookup canonicalize entry in libjava.dll
1175 void *javalib_handle = os::native_java_library();
1176 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
1177 // This lookup only works on 1.3. Do not check for non-null here
1178 }
1179
1180 void ClassLoader::load_jimage_library() {
1181 // First make sure native library is loaded
1182 os::native_java_library();
1183 // Load jimage library
1184 char path[JVM_MAXPATHLEN];
1185 char ebuf[1024];
1186 void* handle = NULL;
1187 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
1188 handle = os::dll_load(path, ebuf, sizeof ebuf);
1189 }
1190 if (handle == NULL) {
1191 vm_exit_during_initialization("Unable to load jimage library", path);
1192 }
1193
1194 // Lookup jimage entry points
1195 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open"));
1196 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found");
1197 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close"));
1198 guarantee(JImageClose != NULL, "function JIMAGE_Close not found");
1199 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule"));
1200 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found");
1201 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource"));
1202 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found");
1203 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource"));
1204 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found");
1205 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator"));
1206 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found");
1207 JImageResourcePath = CAST_TO_FN_PTR(JImage_ResourcePath_t, os::dll_lookup(handle, "JIMAGE_ResourcePath"));
1208 guarantee(JImageResourcePath != NULL, "function JIMAGE_ResourcePath not found");
1209 }
1210
1211 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
1212 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
1213 }
1214
1215 int ClassLoader::crc32(int crc, const char* buf, int len) {
1216 assert(Crc32 != NULL, "ZIP_CRC32 is not found");
1217 return (*Crc32)(crc, (const jbyte*)buf, len);
1218 }
1219
1220 // Function add_package extracts the package from the fully qualified class name
1221 // and checks if the package is in the boot loader's package entry table. If so,
1222 // then it sets the classpath_index in the package entry record.
1223 //
1224 // The classpath_index field is used to find the entry on the boot loader class
1225 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
1226 // in an unnamed module. It is also used to indicate (for all packages whose
1227 // classes are loaded by the boot loader) that at least one of the package's
1228 // classes has been loaded.
1229 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) {
1230 assert(fullq_class_name != NULL, "just checking");
1231
1232 // Get package name from fully qualified class name.
1233 ResourceMark rm;
1234 const char *cp = package_from_name(fullq_class_name);
1235 if (cp != NULL) {
1236 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();
1237 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp, CHECK_false);
1238 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol);
1239 if (pkg_entry != NULL) {
1240 assert(classpath_index != -1, "Unexpected classpath_index");
1241 pkg_entry->set_classpath_index(classpath_index);
1242 } else {
1243 return false;
1244 }
1245 }
1246 return true;
1247 }
1248
1249 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1250 // Look up the name in the boot loader's package entry table.
1251 if (name != NULL) {
1252 TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL);
1253 // Look for the package entry in the boot loader's package entry table.
1254 PackageEntry* package =
1255 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1256
1257 // Return NULL if package does not exist or if no classes in that package
1258 // have been loaded.
1259 if (package != NULL && package->has_loaded_class()) {
1260 ModuleEntry* module = package->module();
1261 if (module->location() != NULL) {
1262 ResourceMark rm(THREAD);
1263 Handle ml = java_lang_String::create_from_str(
1264 module->location()->as_C_string(), THREAD);
1265 return ml();
1266 }
1267 // Return entry on boot loader class path.
1268 Handle cph = java_lang_String::create_from_str(
1269 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1270 return cph();
1271 }
1272 }
1273 return NULL;
1274 }
1275
1276 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1277 ResourceMark rm(THREAD);
1278 // List of pointers to PackageEntrys that have loaded classes.
1279 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
1280 {
1281 MutexLocker ml(Module_lock, THREAD);
1282
1283 PackageEntryTable* pe_table =
1284 ClassLoaderData::the_null_class_loader_data()->packages();
1285
1286 // Collect the packages that have at least one loaded class.
1287 for (int x = 0; x < pe_table->table_size(); x++) {
1288 for (PackageEntry* package_entry = pe_table->bucket(x);
1289 package_entry != NULL;
1290 package_entry = package_entry->next()) {
1291 if (package_entry->has_loaded_class()) {
1292 loaded_class_pkgs->append(package_entry);
1293 }
1294 }
1295 }
1296 }
1297
1298
1299 // Allocate objArray and fill with java.lang.String
1300 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1301 loaded_class_pkgs->length(), CHECK_NULL);
1302 objArrayHandle result(THREAD, r);
1303 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1304 PackageEntry* package_entry = loaded_class_pkgs->at(x);
1305 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1306 result->obj_at_put(x, str());
1307 }
1308 return result();
1309 }
1310
1311 // caller needs ResourceMark
1312 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1313 int class_name_len) {
1314 assert(class_name != NULL, "invariant");
1315 assert((int)strlen(class_name) == class_name_len, "invariant");
1316
1317 static const char class_suffix[] = ".class";
1318
1319 char* const file_name = NEW_RESOURCE_ARRAY(char,
1320 class_name_len +
1321 sizeof(class_suffix)); // includes term NULL
1322
1323 strncpy(file_name, class_name, class_name_len);
1324 strncpy(&file_name[class_name_len], class_suffix, sizeof(class_suffix));
1325
1326 return file_name;
1327 }
1328
1329 ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
1330 const GrowableArray<ModuleClassPathList*>* const module_list) {
1331 int num_of_entries = module_list->length();
1332 const Symbol* class_module_name = mod_entry->name();
1333
1334 // Loop through all the modules in either the patch-module or exploded entries looking for module
1335 for (int i = 0; i < num_of_entries; i++) {
1336 ModuleClassPathList* module_cpl = module_list->at(i);
1337 Symbol* module_cpl_name = module_cpl->module_name();
1338
1339 if (module_cpl_name->fast_compare(class_module_name) == 0) {
1340 // Class' module has been located.
1341 return module_cpl->module_first_entry();
1342 }
1343 }
1344 return NULL;
1345 }
1346
1347
1348 // Search either the patch-module or exploded build entries for class.
1349 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list,
1350 const char* const class_name,
1351 const char* const file_name,
1352 TRAPS) {
1353 ClassFileStream* stream = NULL;
1354
1355 // Find the class' defining module in the boot loader's module entry table
1356 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
1357 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL;
1358
1359 // If the module system has not defined java.base yet, then
1360 // classes loaded are assumed to be defined to java.base.
1361 // When java.base is eventually defined by the module system,
1362 // all packages of classes that have been previously loaded
1363 // are verified in ModuleEntryTable::verify_javabase_packages().
1364 if (!Universe::is_module_initialized() &&
1365 !ModuleEntryTable::javabase_defined() &&
1366 mod_entry == NULL) {
1367 mod_entry = ModuleEntryTable::javabase_moduleEntry();
1368 }
1369
1370 // The module must be a named module
1371 ClassPathEntry* e = NULL;
1372 if (mod_entry != NULL && mod_entry->is_named()) {
1373 if (module_list == _exploded_entries) {
1374 // The exploded build entries can be added to at any time so a lock is
1375 // needed when searching them.
1376 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
1377 MutexLocker ml(Module_lock, THREAD);
1378 e = find_first_module_cpe(mod_entry, module_list);
1379 } else {
1380 e = find_first_module_cpe(mod_entry, module_list);
1381 }
1382 }
1383
1384 // Try to load the class from the module's ClassPathEntry list.
1385 while (e != NULL) {
1386 stream = e->open_stream(file_name, CHECK_NULL);
1387 // No context.check is required since CDS is not supported
1388 // for an exploded modules build or if --patch-module is specified.
1389 if (NULL != stream) {
1390 return stream;
1391 }
1392 e = e->next();
1393 }
1394 // If the module was located, break out even if the class was not
1395 // located successfully from that module's ClassPathEntry list.
1396 // There will not be another valid entry for that module.
1397 return NULL;
1398 }
1399
1400 // Called by the boot classloader to load classes
1401 InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1402 assert(name != NULL, "invariant");
1403 assert(THREAD->is_Java_thread(), "must be a JavaThread");
1404
1405 ResourceMark rm(THREAD);
1406 HandleMark hm(THREAD);
1407
1408 const char* const class_name = name->as_C_string();
1409
1410 EventMark m("loading class %s", class_name);
1411
1412 const char* const file_name = file_name_for_class_name(class_name,
1413 name->utf8_length());
1414 assert(file_name != NULL, "invariant");
1415
1416 ClassLoaderExt::Context context(class_name, file_name, THREAD);
1417
1418 // Lookup stream for parsing .class file
1419 ClassFileStream* stream = NULL;
1420 s2 classpath_index = 0;
1421 ClassPathEntry* e = NULL;
1422
1423 // If DumpSharedSpaces is true boot loader visibility boundaries are set to:
1424 // - [jimage] + [_first_append_entry to _last_append_entry] (all path entries).
1425 //
1426 // If search_append_only is true, boot loader visibility boundaries are
1427 // set to be _first_append_entry to the end. This includes:
1428 // [-Xbootclasspath/a]; [jvmti appended entries]
1429 //
1430 // If both DumpSharedSpaces and search_append_only are false, boot loader
1431 // visibility boundaries are set to be the --patch-module entries plus the base piece.
1432 // This would include:
1433 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1434 //
1435
1436 // Load Attempt #1: --patch-module
1437 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1438 // attempt to load the class from those locations specific to the module.
1439 // Specifications to --patch-module can contain a partial number of classes
1440 // that are part of the overall module definition. So if a particular class is not
1441 // found within its module specification, the search should continue to Load Attempt #2.
1442 // Note: The --patch-module entries are never searched if the boot loader's
1443 // visibility boundary is limited to only searching the append entries.
1444 if (_patch_mod_entries != NULL && !search_append_only) {
1445 // At CDS dump time, the --patch-module entries are ignored. That means a
1446 // class is still loaded from the runtime image even if it might
1447 // appear in the _patch_mod_entries. The runtime shared class visibility
1448 // check will determine if a shared class is visible based on the runtime
1449 // environemnt, including the runtime --patch-module setting.
1450 if (!DumpSharedSpaces) {
1451 stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL);
1452 }
1453 }
1454
1455 // Load Attempt #2: [jimage | exploded build]
1456 if (!search_append_only && (NULL == stream)) {
1457 if (has_jrt_entry()) {
1458 e = _jrt_entry;
1459 stream = _jrt_entry->open_stream(file_name, CHECK_NULL);
1460 } else {
1461 // Exploded build - attempt to locate class in its defining module's location.
1462 assert(_exploded_entries != NULL, "No exploded build entries present");
1463 stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL);
1464 }
1465 }
1466
1467 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1468 if ((search_append_only || DumpSharedSpaces) && (NULL == stream)) {
1469 // For the boot loader append path search, the starting classpath_index
1470 // for the appended piece is always 1 to account for either the
1471 // _jrt_entry or the _exploded_entries.
1472 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1473 classpath_index = 1;
1474
1475 e = _first_append_entry;
1476 while (e != NULL) {
1477 stream = e->open_stream(file_name, CHECK_NULL);
1478 if (NULL != stream) {
1479 break;
1480 }
1481 e = e->next();
1482 ++classpath_index;
1483 }
1484 }
1485
1486 if (NULL == stream) {
1487 return NULL;
1488 }
1489
1490 stream->set_verify(context.should_verify(classpath_index));
1491
1492 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1493 Handle protection_domain;
1494
1495 InstanceKlass* result = KlassFactory::create_from_stream(stream,
1496 name,
1497 loader_data,
1498 protection_domain,
1499 NULL, // host_klass
1500 NULL, // cp_patches
1501 THREAD);
1502 if (HAS_PENDING_EXCEPTION) {
1503 if (DumpSharedSpaces) {
1504 tty->print_cr("Preload Error: Failed to load %s", class_name);
1505 }
1506 return NULL;
1507 }
1508
1509 if (!add_package(file_name, classpath_index, THREAD)) {
1510 return NULL;
1511 }
1512
1513 return result;
1514 }
1515
1516 #if INCLUDE_CDS
1517 static char* skip_uri_protocol(char* source) {
1518 if (strncmp(source, "file:", 5) == 0) {
1519 // file: protocol path could start with file:/ or file:///
1520 // locate the char after all the forward slashes
1521 int offset = 5;
1522 while (*(source + offset) == '/') {
1523 offset++;
1524 }
1525 source += offset;
1526 // for non-windows platforms, move back one char as the path begins with a '/'
1527 #ifndef _WINDOWS
1528 source -= 1;
1529 #endif
1530 } else if (strncmp(source, "jrt:/", 5) == 0) {
1531 source += 5;
1532 }
1533 return source;
1534 }
1535
1536 // Record the shared classpath index and loader type for classes loaded
1537 // by the builtin loaders at dump time.
1538 void ClassLoader::record_result(InstanceKlass* ik, const ClassFileStream* stream) {
1539 assert(DumpSharedSpaces, "sanity");
1540 assert(stream != NULL, "sanity");
1541
1542 if (ik->is_anonymous()) {
1543 // We do not archive anonymous classes.
1544 return;
1545 }
1546
1547 char* src = (char*)stream->source();
1548 if (src == NULL) {
1549 if (ik->class_loader() == NULL) {
1550 // JFR classes
1551 ik->set_shared_classpath_index(0);
1552 ik->set_class_loader_type(ClassLoader::BOOT_LOADER);
1553 }
1554 return;
1555 }
1556
1557 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build");
1558
1559 ModuleEntry* module = ik->module();
1560 int classpath_index = -1;
1561 ResourceMark rm;
1562 char* canonical_path = NEW_RESOURCE_ARRAY(char, JVM_MAXPATHLEN);
1563
1564 // save the path from the file: protocol or the module name from the jrt: protocol
1565 // if no protocol prefix is found, path is the same as stream->source()
1566 char* path = skip_uri_protocol(src);
1567 for (int i = 0; i < FileMapInfo::get_number_of_share_classpaths(); i++) {
1568 SharedClassPathEntry* ent = FileMapInfo::shared_classpath(i);
1569 if (get_canonical_path(ent->name(), canonical_path, JVM_MAXPATHLEN)) {
1570 // If the path (from the class stream srouce) is the same as the shared
1571 // class path, then we have a match. For classes from module image loaded by the
1572 // PlatformClassLoader, the stream->source() is not the name of the module image.
1573 // Need to look for 'jrt:' explicitly.
1574 if (strcmp(canonical_path, os::native_path((char*)path)) == 0 ||
1575 (i == 0 && string_starts_with(src, "jrt:"))) {
1576 classpath_index = i;
1577 break;
1578 }
1579 }
1580 }
1581 if (classpath_index < 0) {
1582 // Shared classpath entry table only contains boot class path and -cp path.
1583 // No path entry found for this class. Must be a shared class loaded by the
1584 // user defined classloader.
1585 assert(ik->shared_classpath_index() < 0, "Sanity");
1586 return;
1587 }
1588
1589 const char* const class_name = ik->name()->as_C_string();
1590 const char* const file_name = file_name_for_class_name(class_name,
1591 ik->name()->utf8_length());
1592 assert(file_name != NULL, "invariant");
1593 Thread* THREAD = Thread::current();
1594 ClassLoaderExt::Context context(class_name, file_name, CATCH);
1595 context.record_result(ik->name(), classpath_index, ik, THREAD);
1596 }
1597 #endif // INCLUDE_CDS
1598
1599 // Initialize the class loader's access to methods in libzip. Parse and
1600 // process the boot classpath into a list ClassPathEntry objects. Once
1601 // this list has been created, it must not change order (see class PackageInfo)
1602 // it can be appended to and is by jvmti and the kernel vm.
1603
1604 void ClassLoader::initialize() {
1605 EXCEPTION_MARK;
1606
1607 if (UsePerfData) {
1608 // jvmstat performance counters
1609 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1610 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1611 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1612 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1613 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1614 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1615 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1616 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1617 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1618 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1619
1620 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1621 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1622 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1623 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1624 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1625 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1626 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1627 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1628 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1629 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1630 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1631 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1632 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1633
1634
1635 // The following performance counters are added for measuring the impact
1636 // of the bug fix of 6365597. They are mainly focused on finding out
1637 // the behavior of system & user-defined classloader lock, whether
1638 // ClassLoader.loadClass/findClass is being called synchronized or not.
1639 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1640 "systemLoaderLockContentionRate");
1641 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1642 "nonSystemLoaderLockContentionRate");
1643 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1644 "jvmFindLoadedClassNoLockCalls");
1645 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1646 "jvmDefineClassNoLockCalls");
1647
1648 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1649 "jniDefineClassNoLockCalls");
1650
1651 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1652 "unsafeDefineClassCalls");
1653
1654 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
1655 "loadInstanceClassFailRate");
1656 }
1657
1658 // lookup zip library entry points
1659 load_zip_library();
1660 // lookup jimage library entry points
1661 load_jimage_library();
1662 #if INCLUDE_CDS
1663 // initialize search path
1664 if (DumpSharedSpaces) {
1665 _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info();
1666 }
1667 #endif
1668 setup_bootstrap_search_path();
1669 }
1670
1671 #if INCLUDE_CDS
1672 void ClassLoader::initialize_shared_path() {
1673 if (DumpSharedSpaces) {
1674 ClassLoaderExt::setup_search_paths();
1675 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1676 }
1677 }
1678 #endif
1679
1680 jlong ClassLoader::classloader_time_ms() {
1681 return UsePerfData ?
1682 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1683 }
1684
1685 jlong ClassLoader::class_init_count() {
1686 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1687 }
1688
1689 jlong ClassLoader::class_init_time_ms() {
1690 return UsePerfData ?
1691 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1692 }
1693
1694 jlong ClassLoader::class_verify_time_ms() {
1695 return UsePerfData ?
1696 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1697 }
1698
1699 jlong ClassLoader::class_link_count() {
1700 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1701 }
1702
1703 jlong ClassLoader::class_link_time_ms() {
1704 return UsePerfData ?
1705 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1706 }
1707
1708 int ClassLoader::compute_Object_vtable() {
1709 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1710 // code to determine actual value from file
1711 // Would be value '11' if finals were in vtable
1712 int JDK_1_2_Object_vtable_size = 5;
1713 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1714 }
1715
1716
1717 void classLoader_init1() {
1718 ClassLoader::initialize();
1719 }
1720
1721 // Complete the ClassPathEntry setup for the boot loader
1722 void ClassLoader::classLoader_init2(TRAPS) {
1723 // Setup the list of module/path pairs for --patch-module processing
1724 // This must be done after the SymbolTable is created in order
1725 // to use fast_compare on module names instead of a string compare.
1726 if (Arguments::get_patch_mod_prefix() != NULL) {
1727 setup_patch_mod_entries();
1728 }
1729
1730 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
1731 // to successfully determine if java.base has been patched)
1732 create_javabase();
1733
1734 // Setup the initial java.base/path pair for the exploded build entries.
1735 // As more modules are defined during module system initialization, more
1736 // entries will be added to the exploded build array.
1737 if (!has_jrt_entry()) {
1738 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds");
1739 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds");
1740 // Set up the boot loader's _exploded_entries list. Note that this gets
1741 // done before loading any classes, by the same thread that will
1742 // subsequently do the first class load. So, no lock is needed for this.
1743 assert(_exploded_entries == NULL, "Should only get initialized once");
1744 _exploded_entries = new (ResourceObj::C_HEAP, mtModule)
1745 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true);
1746 add_to_exploded_build_list(vmSymbols::java_base(), CHECK);
1747 }
1748 }
1749
1750
1751 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1752 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1753 if (CanonicalizeEntry != NULL) {
1754 JavaThread* THREAD = JavaThread::current();
1755 JNIEnv* env = THREAD->jni_environment();
1756 ResourceMark rm(THREAD);
1757
1758 // os::native_path writes into orig_copy
1759 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1760 strcpy(orig_copy, orig);
1761 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1762 return false;
1763 }
1764 } else {
1765 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1766 strncpy(out, orig, len);
1767 out[len - 1] = '\0';
1768 }
1769 return true;
1770 }
1771
1772 void ClassLoader::create_javabase() {
1773 Thread* THREAD = Thread::current();
1774
1775 // Create java.base's module entry for the boot
1776 // class loader prior to loading j.l.Ojbect.
1777 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1778
1779 // Get module entry table
1780 ModuleEntryTable* null_cld_modules = null_cld->modules();
1781 if (null_cld_modules == NULL) {
1782 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1783 }
1784
1785 {
1786 MutexLocker ml(Module_lock, THREAD);
1787 ModuleEntry* jb_module = null_cld_modules->locked_create_entry_or_null(Handle(),
1788 false, vmSymbols::java_base(), NULL, NULL, null_cld);
1789 if (jb_module == NULL) {
1790 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
1791 }
1792 ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1793 }
1794 }
1795
1796 #ifndef PRODUCT
1797
1798 // CompileTheWorld
1799 //
1800 // Iterates over all class path entries and forces compilation of all methods
1801 // in all classes found. Currently, only zip/jar archives are searched.
1802 //
1803 // The classes are loaded by the Java level bootstrap class loader, and the
1804 // initializer is called. If DelayCompilationDuringStartup is true (default),
1805 // the interpreter will run the initialization code. Note that forcing
1806 // initialization in this way could potentially lead to initialization order
1807 // problems, in which case we could just force the initialization bit to be set.
1808
1809
1810 // We need to iterate over the contents of a zip/jar file, so we replicate the
1811 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
1812 // since jzfile already has a void* definition.
1813 //
1814 // Note that this is only used in debug mode.
1815 //
1816 // HotSpot integration note:
1817 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
1818
1819
1820 // JDK 1.3 version
1821 typedef struct real_jzentry { /* Zip file entry */
1822 char *name; /* entry name */
1823 jint time; /* modification time */
1824 jint size; /* size of uncompressed data */
1825 jint csize; /* size of compressed data (zero if uncompressed) */
1826 jint crc; /* crc of uncompressed data */
1827 char *comment; /* optional zip file comment */
1828 jbyte *extra; /* optional extra data */
1829 jint pos; /* position of LOC header (if negative) or data */
1830 } real_jzentry;
1831
1832 typedef struct real_jzfile { /* Zip file */
1833 char *name; /* zip file name */
1834 jint refs; /* number of active references */
1835 jint fd; /* open file descriptor */
1836 void *lock; /* read lock */
1837 char *comment; /* zip file comment */
1838 char *msg; /* zip error message */
1839 void *entries; /* array of hash cells */
1840 jint total; /* total number of entries */
1841 unsigned short *table; /* Hash chain heads: indexes into entries */
1842 jint tablelen; /* number of hash eads */
1843 real_jzfile *next; /* next zip file in search list */
1844 jzentry *cache; /* we cache the most recently freed jzentry */
1845 /* Information on metadata names in META-INF directory */
1846 char **metanames; /* array of meta names (may have null names) */
1847 jint metacount; /* number of slots in metanames array */
1848 /* If there are any per-entry comments, they are in the comments array */
1849 char **comments;
1850 } real_jzfile;
1851
1852 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
1853 // For now we only compile all methods in all classes in zip/jar files
1854 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
1855 tty->cr();
1856 }
1857
1858 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
1859 real_jzfile* zip = (real_jzfile*) _zip;
1860 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
1861 tty->cr();
1862 // Iterate over all entries in zip file
1863 for (int n = 0; ; n++) {
1864 real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n));
1865 if (ze == NULL) break;
1866 ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
1867 }
1868 if (HAS_PENDING_EXCEPTION) {
1869 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1870 CLEAR_PENDING_EXCEPTION;
1871 tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
1872 tty->print_cr("Increase class metadata storage if a limit was set");
1873 } else {
1874 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
1875 }
1876 }
1877 }
1878
1879 void ClassLoader::compile_the_world() {
1880 EXCEPTION_MARK;
1881 HandleMark hm(THREAD);
1882 ResourceMark rm(THREAD);
1883
1884 assert(has_jrt_entry(), "Compile The World not supported with exploded module build");
1885
1886 // Find bootstrap loader
1887 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
1888 jlong start = os::javaTimeMillis();
1889
1890 // Compile the world for the modular java runtime image
1891 _jrt_entry->compile_the_world(system_class_loader, CATCH);
1892
1893 // Iterate over all bootstrap class path appended entries
1894 ClassPathEntry* e = _first_append_entry;
1895 while (e != NULL) {
1896 assert(!e->is_modules_image(), "A modular java runtime image is present on the list of appended entries");
1897 e->compile_the_world(system_class_loader, CATCH);
1898 e = e->next();
1899 }
1900 jlong end = os::javaTimeMillis();
1901 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)",
1902 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start));
1903 {
1904 // Print statistics as if before normal exit:
1905 extern void print_statistics();
1906 print_statistics();
1907 }
1908 vm_exit(0);
1909 }
1910
1911 int ClassLoader::_compile_the_world_class_counter = 0;
1912 int ClassLoader::_compile_the_world_method_counter = 0;
1913 static int _codecache_sweep_counter = 0;
1914
1915 // Filter out all exceptions except OOMs
1916 static void clear_pending_exception_if_not_oom(TRAPS) {
1917 if (HAS_PENDING_EXCEPTION &&
1918 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
1919 CLEAR_PENDING_EXCEPTION;
1920 }
1921 // The CHECK at the caller will propagate the exception out
1922 }
1923
1924 /**
1925 * Returns if the given method should be compiled when doing compile-the-world.
1926 *
1927 * TODO: This should be a private method in a CompileTheWorld class.
1928 */
1929 static bool can_be_compiled(const methodHandle& m, int comp_level) {
1930 assert(CompileTheWorld, "must be");
1931
1932 // It's not valid to compile a native wrapper for MethodHandle methods
1933 // that take a MemberName appendix since the bytecode signature is not
1934 // correct.
1935 vmIntrinsics::ID iid = m->intrinsic_id();
1936 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) {
1937 return false;
1938 }
1939
1940 return CompilationPolicy::can_be_compiled(m, comp_level);
1941 }
1942
1943 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
1944 if (string_ends_with(name, ".class")) {
1945 // We have a .class file
1946 int len = (int)strlen(name);
1947 char buffer[2048];
1948 strncpy(buffer, name, len - 6);
1949 buffer[len-6] = 0;
1950 // If the file has a period after removing .class, it's not really a
1951 // valid class file. The class loader will check everything else.
1952 if (strchr(buffer, '.') == NULL) {
1953 _compile_the_world_class_counter++;
1954 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return;
1955
1956 // Construct name without extension
1957 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK);
1958 // Use loader to load and initialize class
1959 Klass* k = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
1960 if (k != NULL && !HAS_PENDING_EXCEPTION) {
1961 k->initialize(THREAD);
1962 }
1963 bool exception_occurred = HAS_PENDING_EXCEPTION;
1964 clear_pending_exception_if_not_oom(CHECK);
1965 if (CompileTheWorldPreloadClasses && k != NULL) {
1966 InstanceKlass* ik = InstanceKlass::cast(k);
1967 ConstantPool::preload_and_initialize_all_classes(ik->constants(), THREAD);
1968 if (HAS_PENDING_EXCEPTION) {
1969 // If something went wrong in preloading we just ignore it
1970 clear_pending_exception_if_not_oom(CHECK);
1971 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer);
1972 }
1973 }
1974
1975 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) {
1976 if (k == NULL || exception_occurred) {
1977 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class
1978 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer);
1979 } else {
1980 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer);
1981 // Preload all classes to get around uncommon traps
1982 // Iterate over all methods in class
1983 int comp_level = CompilationPolicy::policy()->initial_compile_level();
1984 InstanceKlass* ik = InstanceKlass::cast(k);
1985 for (int n = 0; n < ik->methods()->length(); n++) {
1986 methodHandle m (THREAD, ik->methods()->at(n));
1987 if (can_be_compiled(m, comp_level)) {
1988 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) {
1989 // Give sweeper a chance to keep up with CTW
1990 VM_CTWThreshold op;
1991 VMThread::execute(&op);
1992 _codecache_sweep_counter = 0;
1993 }
1994 // Force compilation
1995 CompileBroker::compile_method(m, InvocationEntryBci, comp_level,
1996 methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
1997 if (HAS_PENDING_EXCEPTION) {
1998 clear_pending_exception_if_not_oom(CHECK);
1999 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
2000 } else {
2001 _compile_the_world_method_counter++;
2002 }
2003 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) {
2004 // Clobber the first compile and force second tier compilation
2005 CompiledMethod* nm = m->code();
2006 if (nm != NULL && !m->is_method_handle_intrinsic()) {
2007 // Throw out the code so that the code cache doesn't fill up
2008 nm->make_not_entrant();
2009 }
2010 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization,
2011 methodHandle(), 0, CompileTask::Reason_CTW, THREAD);
2012 if (HAS_PENDING_EXCEPTION) {
2013 clear_pending_exception_if_not_oom(CHECK);
2014 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
2015 } else {
2016 _compile_the_world_method_counter++;
2017 }
2018 }
2019 } else {
2020 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string());
2021 }
2022
2023 CompiledMethod* nm = m->code();
2024 if (nm != NULL && !m->is_method_handle_intrinsic()) {
2025 // Throw out the code so that the code cache doesn't fill up
2026 nm->make_not_entrant();
2027 }
2028 }
2029 }
2030 }
2031 }
2032 }
2033 }
2034
2035 #endif //PRODUCT
2036
2037 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
2038 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
2039 void PerfClassTraceTime::initialize() {
2040 if (!UsePerfData) return;
2041
2042 if (_eventp != NULL) {
2043 // increment the event counter
2044 _eventp->inc();
2045 }
2046
2047 // stop the current active thread-local timer to measure inclusive time
2048 _prev_active_event = -1;
2049 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
2050 if (_timers[i].is_active()) {
2051 assert(_prev_active_event == -1, "should have only one active timer");
2052 _prev_active_event = i;
2053 _timers[i].stop();
2054 }
2055 }
2056
2057 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
2058 // start the inclusive timer if not recursively called
2059 _t.start();
2060 }
2061
2062 // start thread-local timer of the given event type
2063 if (!_timers[_event_type].is_active()) {
2064 _timers[_event_type].start();
2065 }
2066 }
2067
2068 PerfClassTraceTime::~PerfClassTraceTime() {
2069 if (!UsePerfData) return;
2070
2071 // stop the thread-local timer as the event completes
2072 // and resume the thread-local timer of the event next on the stack
2073 _timers[_event_type].stop();
2074 jlong selftime = _timers[_event_type].ticks();
2075
2076 if (_prev_active_event >= 0) {
2077 _timers[_prev_active_event].start();
2078 }
2079
2080 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
2081
2082 // increment the counters only on the leaf call
2083 _t.stop();
2084 _timep->inc(_t.ticks());
2085 if (_selftimep != NULL) {
2086 _selftimep->inc(selftime);
2087 }
2088 // add all class loading related event selftime to the accumulated time counter
2089 ClassLoader::perf_accumulated_time()->inc(selftime);
2090
2091 // reset the timer
2092 _timers[_event_type].reset();
2093 }