1 /* 2 * Copyright (c) 2015, 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 "classfile/classFileParser.hpp" 27 #include "classfile/classFileStream.hpp" 28 #include "classfile/classListParser.hpp" 29 #include "classfile/classLoader.inline.hpp" 30 #include "classfile/classLoaderExt.hpp" 31 #include "classfile/classLoaderData.inline.hpp" 32 #include "classfile/klassFactory.hpp" 33 #include "classfile/modules.hpp" 34 #include "classfile/sharedClassUtil.hpp" 35 #include "classfile/sharedPathsMiscInfo.hpp" 36 #include "classfile/systemDictionaryShared.hpp" 37 #include "classfile/vmSymbols.hpp" 38 #include "memory/allocation.inline.hpp" 39 #include "memory/filemap.hpp" 40 #include "memory/resourceArea.hpp" 41 #include "oops/instanceKlass.hpp" 42 #include "oops/oop.inline.hpp" 43 #include "oops/symbol.hpp" 44 #include "runtime/arguments.hpp" 45 #include "runtime/handles.inline.hpp" 46 #include "runtime/java.hpp" 47 #include "runtime/javaCalls.hpp" 48 #include "runtime/os.hpp" 49 #include "services/threadService.hpp" 50 #include "utilities/stringUtils.hpp" 51 52 jshort ClassLoaderExt::_app_class_paths_start_index = ClassLoaderExt::max_classpath_index; 53 jshort ClassLoaderExt::_app_module_paths_start_index = ClassLoaderExt::max_classpath_index; 54 bool ClassLoaderExt::_has_app_classes = false; 55 bool ClassLoaderExt::_has_platform_classes = false; 56 57 void ClassLoaderExt::append_boot_classpath(ClassPathEntry* new_entry) { 58 #if INCLUDE_CDS 59 warning("Sharing is only supported for boot loader classes because bootstrap classpath has been appended"); 60 FileMapHeaderExt* header = (FileMapHeaderExt*)FileMapInfo::current_info()->header(); 61 header->set_has_platform_or_app_classes(false); 62 #endif 63 ClassLoader::add_to_boot_append_entries(new_entry); 64 } 65 66 void ClassLoaderExt::setup_app_search_path() { 67 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump"); 68 _app_class_paths_start_index = ClassLoader::num_boot_classpath_entries(); 69 char* app_class_path = os::strdup(Arguments::get_appclasspath()); 70 71 if (strcmp(app_class_path, ".") == 0) { 72 // This doesn't make any sense, even for AppCDS, so let's skip it. We 73 // don't want to throw an error here because -cp "." is usually assigned 74 // by the launcher when classpath is not specified. 75 trace_class_path("app loader class path (skipped)=", app_class_path); 76 } else { 77 trace_class_path("app loader class path=", app_class_path); 78 shared_paths_misc_info()->add_app_classpath(app_class_path); 79 ClassLoader::setup_app_search_path(app_class_path); 80 } 81 } 82 83 void ClassLoaderExt::process_module_table(ModuleEntryTable* met, TRAPS) { 84 ResourceMark rm(THREAD); 85 for (int i = 0; i < met->table_size(); i++) { 86 for (ModuleEntry* m = met->bucket(i); m != NULL;) { 87 char* path = m->location()->as_C_string(); 88 if (strncmp(path, "file:", 5) == 0) { 89 path = ClassLoader::skip_uri_protocol(path); 90 ClassLoader::setup_module_search_path(path, THREAD); 91 } 92 m = m->next(); 93 } 94 } 95 } 96 void ClassLoaderExt::setup_module_paths(TRAPS) { 97 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump"); 98 _app_module_paths_start_index = ClassLoader::num_boot_classpath_entries() + 99 ClassLoader::num_app_classpath_entries(); 100 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader()); 101 ModuleEntryTable* met = Modules::get_module_entry_table(system_class_loader); 102 process_module_table(met, THREAD); 103 } 104 105 char* ClassLoaderExt::read_manifest(ClassPathEntry* entry, jint *manifest_size, bool clean_text, TRAPS) { 106 const char* name = "META-INF/MANIFEST.MF"; 107 char* manifest; 108 jint size; 109 110 assert(entry->is_jar_file(), "must be"); 111 manifest = (char*) ((ClassPathZipEntry*)entry )->open_entry(name, &size, true, CHECK_NULL); 112 113 if (manifest == NULL) { // No Manifest 114 *manifest_size = 0; 115 return NULL; 116 } 117 118 119 if (clean_text) { 120 // See http://docs.oracle.com/javase/6/docs/technotes/guides/jar/jar.html#JAR%20Manifest 121 // (1): replace all CR/LF and CR with LF 122 StringUtils::replace_no_expand(manifest, "\r\n", "\n"); 123 124 // (2) remove all new-line continuation (remove all "\n " substrings) 125 StringUtils::replace_no_expand(manifest, "\n ", ""); 126 } 127 128 *manifest_size = (jint)strlen(manifest); 129 return manifest; 130 } 131 132 char* ClassLoaderExt::get_class_path_attr(const char* jar_path, char* manifest, jint manifest_size) { 133 const char* tag = "Class-Path: "; 134 const int tag_len = (int)strlen(tag); 135 char* found = NULL; 136 char* line_start = manifest; 137 char* end = manifest + manifest_size; 138 139 assert(*end == 0, "must be nul-terminated"); 140 141 while (line_start < end) { 142 char* line_end = strchr(line_start, '\n'); 143 if (line_end == NULL) { 144 // JAR spec require the manifest file to be terminated by a new line. 145 break; 146 } 147 if (strncmp(tag, line_start, tag_len) == 0) { 148 if (found != NULL) { 149 // Same behavior as jdk/src/share/classes/java/util/jar/Attributes.java 150 // If duplicated entries are found, the last one is used. 151 tty->print_cr("Warning: Duplicate name in Manifest: %s.\n" 152 "Ensure that the manifest does not have duplicate entries, and\n" 153 "that blank lines separate individual sections in both your\n" 154 "manifest and in the META-INF/MANIFEST.MF entry in the jar file:\n%s\n", tag, jar_path); 155 } 156 found = line_start + tag_len; 157 assert(found <= line_end, "sanity"); 158 *line_end = '\0'; 159 } 160 line_start = line_end + 1; 161 } 162 return found; 163 } 164 165 void ClassLoaderExt::process_jar_manifest(ClassPathEntry* entry, 166 bool check_for_duplicates) { 167 Thread* THREAD = Thread::current(); 168 ResourceMark rm(THREAD); 169 jint manifest_size; 170 char* manifest = read_manifest(entry, &manifest_size, CHECK); 171 172 if (manifest == NULL) { 173 return; 174 } 175 176 if (strstr(manifest, "Extension-List:") != NULL) { 177 tty->print_cr("-Xshare:dump does not support Extension-List in JAR manifest: %s", entry->name()); 178 vm_exit(1); 179 } 180 181 char* cp_attr = get_class_path_attr(entry->name(), manifest, manifest_size); 182 183 if (cp_attr != NULL && strlen(cp_attr) > 0) { 184 trace_class_path("found Class-Path: ", cp_attr); 185 186 char sep = os::file_separator()[0]; 187 const char* dir_name = entry->name(); 188 const char* dir_tail = strrchr(dir_name, sep); 189 int dir_len; 190 if (dir_tail == NULL) { 191 dir_len = 0; 192 } else { 193 dir_len = dir_tail - dir_name + 1; 194 } 195 196 // Split the cp_attr by spaces, and add each file 197 char* file_start = cp_attr; 198 char* end = file_start + strlen(file_start); 199 200 while (file_start < end) { 201 char* file_end = strchr(file_start, ' '); 202 if (file_end != NULL) { 203 *file_end = 0; 204 file_end += 1; 205 } else { 206 file_end = end; 207 } 208 209 int name_len = (int)strlen(file_start); 210 if (name_len > 0) { 211 ResourceMark rm(THREAD); 212 char* libname = NEW_RESOURCE_ARRAY(char, dir_len + name_len + 1); 213 *libname = 0; 214 strncat(libname, dir_name, dir_len); 215 strncat(libname, file_start, name_len); 216 trace_class_path("library = ", libname); 217 ClassLoader::update_class_path_entry_list(libname, true, false); 218 } 219 220 file_start = file_end; 221 } 222 } 223 } 224 225 void ClassLoaderExt::setup_search_paths() { 226 shared_paths_misc_info()->record_app_offset(); 227 ClassLoaderExt::setup_app_search_path(); 228 } 229 230 Thread* ClassLoaderExt::Context::_dump_thread = NULL; 231 232 void ClassLoaderExt::record_result(ClassLoaderExt::Context *context, 233 Symbol* class_name, 234 const s2 classpath_index, 235 InstanceKlass* result, 236 TRAPS) { 237 assert(DumpSharedSpaces, "Sanity"); 238 239 // We need to remember where the class comes from during dumping. 240 oop loader = result->class_loader(); 241 s2 classloader_type = ClassLoader::BOOT_LOADER; 242 if (SystemDictionary::is_system_class_loader(loader)) { 243 classloader_type = ClassLoader::APP_LOADER; 244 ClassLoaderExt::set_has_app_classes(); 245 } else if (SystemDictionary::is_platform_class_loader(loader)) { 246 classloader_type = ClassLoader::PLATFORM_LOADER; 247 ClassLoaderExt::set_has_platform_classes(); 248 } 249 result->set_shared_classpath_index(classpath_index); 250 result->set_class_loader_type(classloader_type); 251 } 252 253 void ClassLoaderExt::finalize_shared_paths_misc_info() { 254 if (!_has_app_classes) { 255 shared_paths_misc_info()->pop_app(); 256 } 257 } 258 259 // Load the class of the given name from the location given by path. The path is specified by 260 // the "source:" in the class list file (see classListParser.cpp), and can be a directory or 261 // a JAR file. 262 InstanceKlass* ClassLoaderExt::load_class(Symbol* name, const char* path, TRAPS) { 263 264 assert(name != NULL, "invariant"); 265 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump"); 266 ResourceMark rm(THREAD); 267 const char* class_name = name->as_C_string(); 268 269 const char* file_name = file_name_for_class_name(class_name, 270 name->utf8_length()); 271 assert(file_name != NULL, "invariant"); 272 273 // Lookup stream for parsing .class file 274 ClassFileStream* stream = NULL; 275 ClassPathEntry* e = find_classpath_entry_from_cache(path, CHECK_NULL); 276 if (e == NULL) { 277 return NULL; 278 } 279 { 280 PerfClassTraceTime vmtimer(perf_sys_class_lookup_time(), 281 ((JavaThread*) THREAD)->get_thread_stat()->perf_timers_addr(), 282 PerfClassTraceTime::CLASS_LOAD); 283 stream = e->open_stream(file_name, CHECK_NULL); 284 } 285 286 if (NULL == stream) { 287 tty->print_cr("Preload Warning: Cannot find %s", class_name); 288 return NULL; 289 } 290 291 assert(stream != NULL, "invariant"); 292 stream->set_verify(true); 293 294 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 295 Handle protection_domain; 296 297 InstanceKlass* result = KlassFactory::create_from_stream(stream, 298 name, 299 loader_data, 300 protection_domain, 301 NULL, // host_klass 302 NULL, // cp_patches 303 THREAD); 304 305 if (HAS_PENDING_EXCEPTION) { 306 tty->print_cr("Preload Error: Failed to load %s", class_name); 307 return NULL; 308 } 309 result->set_shared_classpath_index(UNREGISTERED_INDEX); 310 SystemDictionaryShared::set_shared_class_misc_info(result, stream); 311 return result; 312 } 313 314 struct CachedClassPathEntry { 315 const char* _path; 316 ClassPathEntry* _entry; 317 }; 318 319 static GrowableArray<CachedClassPathEntry>* cached_path_entries = NULL; 320 321 ClassPathEntry* ClassLoaderExt::find_classpath_entry_from_cache(const char* path, TRAPS) { 322 // This is called from dump time so it's single threaded and there's no need for a lock. 323 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump"); 324 if (cached_path_entries == NULL) { 325 cached_path_entries = new (ResourceObj::C_HEAP, mtClass) GrowableArray<CachedClassPathEntry>(20, /*c heap*/ true); 326 } 327 CachedClassPathEntry ccpe; 328 for (int i=0; i<cached_path_entries->length(); i++) { 329 ccpe = cached_path_entries->at(i); 330 if (strcmp(ccpe._path, path) == 0) { 331 if (i != 0) { 332 // Put recent entries at the beginning to speed up searches. 333 cached_path_entries->remove_at(i); 334 cached_path_entries->insert_before(0, ccpe); 335 } 336 return ccpe._entry; 337 } 338 } 339 340 struct stat st; 341 if (os::stat(path, &st) != 0) { 342 // File or directory not found 343 return NULL; 344 } 345 ClassPathEntry* new_entry = NULL; 346 347 new_entry = create_class_path_entry(path, &st, false, false, CHECK_NULL); 348 if (new_entry == NULL) { 349 return NULL; 350 } 351 ccpe._path = strdup(path); 352 ccpe._entry = new_entry; 353 cached_path_entries->insert_before(0, ccpe); 354 return new_entry; 355 } 356 357 Klass* ClassLoaderExt::load_one_class(ClassListParser* parser, TRAPS) { 358 return parser->load_current_class(THREAD); 359 }