1 /* 2 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/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/sharedClassUtil.hpp" 34 #include "classfile/sharedPathsMiscInfo.hpp" 35 #include "classfile/systemDictionaryShared.hpp" 36 #include "classfile/vmSymbols.hpp" 37 #include "memory/allocation.inline.hpp" 38 #include "memory/filemap.hpp" 39 #include "memory/resourceArea.hpp" 40 #include "oops/instanceKlass.hpp" 41 #include "oops/oop.inline.hpp" 42 #include "oops/symbol.hpp" 43 #include "runtime/arguments.hpp" 44 #include "runtime/java.hpp" 45 #include "runtime/javaCalls.hpp" 46 #include "runtime/os.hpp" 47 #include "services/threadService.hpp" 48 #include "utilities/stringUtils.hpp" 49 50 jshort ClassLoaderExt::_app_paths_start_index = ClassLoaderExt::max_classpath_index; 51 bool ClassLoaderExt::_has_app_classes = false; 52 bool ClassLoaderExt::_has_platform_classes = false; 53 54 void ClassLoaderExt::setup_app_search_path() { 55 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump and -XX:+UseAppCDS"); 56 _app_paths_start_index = ClassLoader::num_boot_classpath_entries(); 57 char* app_class_path = os::strdup(Arguments::get_appclasspath()); 58 59 if (strcmp(app_class_path, ".") == 0) { 60 // This doesn't make any sense, even for AppCDS, so let's skip it. We 61 // don't want to throw an error here because -cp "." is usually assigned 62 // by the launcher when classpath is not specified. 63 trace_class_path("app loader class path (skipped)=", app_class_path); 64 } else { 65 trace_class_path("app loader class path=", app_class_path); 66 shared_paths_misc_info()->add_app_classpath(app_class_path); 67 ClassLoader::setup_app_search_path(app_class_path); 68 } 69 } 70 71 char* ClassLoaderExt::read_manifest(ClassPathEntry* entry, jint *manifest_size, bool clean_text, TRAPS) { 72 const char* name = "META-INF/MANIFEST.MF"; 73 char* manifest; 74 jint size; 75 76 assert(entry->is_jar_file(), "must be"); 77 manifest = (char*) ((ClassPathZipEntry*)entry )->open_entry(name, &size, true, CHECK_NULL); 78 79 if (manifest == NULL) { // No Manifest 80 *manifest_size = 0; 81 return NULL; 82 } 83 84 85 if (clean_text) { 86 // See http://docs.oracle.com/javase/6/docs/technotes/guides/jar/jar.html#JAR%20Manifest 87 // (1): replace all CR/LF and CR with LF 88 StringUtils::replace_no_expand(manifest, "\r\n", "\n"); 89 90 // (2) remove all new-line continuation (remove all "\n " substrings) 91 StringUtils::replace_no_expand(manifest, "\n ", ""); 92 } 93 94 *manifest_size = (jint)strlen(manifest); 95 return manifest; 96 } 97 98 char* ClassLoaderExt::get_class_path_attr(const char* jar_path, char* manifest, jint manifest_size) { 99 const char* tag = "Class-Path: "; 100 const int tag_len = (int)strlen(tag); 101 char* found = NULL; 102 char* line_start = manifest; 103 char* end = manifest + manifest_size; 104 105 assert(*end == 0, "must be nul-terminated"); 106 107 while (line_start < end) { 108 char* line_end = strchr(line_start, '\n'); 109 if (line_end == NULL) { 110 // JAR spec require the manifest file to be terminated by a new line. 111 break; 112 } 113 if (strncmp(tag, line_start, tag_len) == 0) { 114 if (found != NULL) { 115 // Same behavior as jdk/src/share/classes/java/util/jar/Attributes.java 116 // If duplicated entries are found, the last one is used. 117 tty->print_cr("Warning: Duplicate name in Manifest: %s.\n" 118 "Ensure that the manifest does not have duplicate entries, and\n" 119 "that blank lines separate individual sections in both your\n" 120 "manifest and in the META-INF/MANIFEST.MF entry in the jar file:\n%s\n", tag, jar_path); 121 } 122 found = line_start + tag_len; 123 assert(found <= line_end, "sanity"); 124 *line_end = '\0'; 125 } 126 line_start = line_end + 1; 127 } 128 return found; 129 } 130 131 void ClassLoaderExt::process_jar_manifest(ClassPathEntry* entry, 132 bool check_for_duplicates) { 133 Thread* THREAD = Thread::current(); 134 ResourceMark rm(THREAD); 135 jint manifest_size; 136 char* manifest = read_manifest(entry, &manifest_size, CHECK); 137 138 if (manifest == NULL) { 139 return; 140 } 141 142 if (strstr(manifest, "Extension-List:") != NULL) { 143 tty->print_cr("-Xshare:dump does not support Extension-List in JAR manifest: %s", entry->name()); 144 vm_exit(1); 145 } 146 147 char* cp_attr = get_class_path_attr(entry->name(), manifest, manifest_size); 148 149 if (cp_attr != NULL && strlen(cp_attr) > 0) { 150 trace_class_path("found Class-Path: ", cp_attr); 151 152 char sep = os::file_separator()[0]; 153 const char* dir_name = entry->name(); 154 const char* dir_tail = strrchr(dir_name, sep); 155 int dir_len; 156 if (dir_tail == NULL) { 157 dir_len = 0; 158 } else { 159 dir_len = dir_tail - dir_name + 1; 160 } 161 162 // Split the cp_attr by spaces, and add each file 163 char* file_start = cp_attr; 164 char* end = file_start + strlen(file_start); 165 166 while (file_start < end) { 167 char* file_end = strchr(file_start, ' '); 168 if (file_end != NULL) { 169 *file_end = 0; 170 file_end += 1; 171 } else { 172 file_end = end; 173 } 174 175 int name_len = (int)strlen(file_start); 176 if (name_len > 0) { 177 ResourceMark rm(THREAD); 178 char* libname = NEW_RESOURCE_ARRAY(char, dir_len + name_len + 1); 179 *libname = 0; 180 strncat(libname, dir_name, dir_len); 181 strncat(libname, file_start, name_len); 182 trace_class_path("library = ", libname); 183 ClassLoader::update_class_path_entry_list(libname, true, false); 184 } 185 186 file_start = file_end; 187 } 188 } 189 } 190 191 void ClassLoaderExt::setup_search_paths() { 192 if (UseAppCDS) { 193 shared_paths_misc_info()->record_app_offset(); 194 ClassLoaderExt::setup_app_search_path(); 195 } 196 } 197 198 Thread* ClassLoaderExt::Context::_dump_thread = NULL; 199 200 bool ClassLoaderExt::check(ClassLoaderExt::Context *context, 201 const ClassFileStream* stream, 202 const int classpath_index) { 203 if (stream != NULL) { 204 // Ignore any App classes from signed JAR file during CDS archiving 205 // dumping 206 if (DumpSharedSpaces && 207 SharedClassUtil::is_classpath_entry_signed(classpath_index) && 208 classpath_index >= _app_paths_start_index) { 209 tty->print_cr("Preload Warning: Skipping %s from signed JAR", 210 context->class_name()); 211 return false; 212 } 213 if (classpath_index >= _app_paths_start_index) { 214 _has_app_classes = true; 215 _has_platform_classes = true; 216 } 217 } 218 219 return true; 220 } 221 222 void ClassLoaderExt::record_result(ClassLoaderExt::Context *context, 223 Symbol* class_name, 224 const s2 classpath_index, 225 InstanceKlass* result, 226 TRAPS) { 227 assert(DumpSharedSpaces, "Sanity"); 228 229 // We need to remember where the class comes from during dumping. 230 oop loader = result->class_loader(); 231 s2 classloader_type = ClassLoader::BOOT_LOADER; 232 if (SystemDictionary::is_system_class_loader(loader)) { 233 classloader_type = ClassLoader::APP_LOADER; 234 ClassLoaderExt::set_has_app_classes(); 235 } else if (SystemDictionary::is_platform_class_loader(loader)) { 236 classloader_type = ClassLoader::PLATFORM_LOADER; 237 ClassLoaderExt::set_has_platform_classes(); 238 } 239 result->set_shared_classpath_index(classpath_index); 240 result->set_class_loader_type(classloader_type); 241 } 242 243 void ClassLoaderExt::finalize_shared_paths_misc_info() { 244 if (UseAppCDS) { 245 if (!_has_app_classes) { 246 shared_paths_misc_info()->pop_app(); 247 } 248 } 249 } 250 251 // Load the class of the given name from the location given by path. The path is specified by 252 // the "source:" in the class list file (see classListParser.cpp), and can be a directory or 253 // a JAR file. 254 InstanceKlass* ClassLoaderExt::load_class(Symbol* name, const char* path, TRAPS) { 255 256 assert(name != NULL, "invariant"); 257 assert(DumpSharedSpaces && UseAppCDS, "this function is only used with -Xshare:dump and -XX:+UseAppCDS"); 258 ResourceMark rm(THREAD); 259 const char* class_name = name->as_C_string(); 260 261 const char* file_name = file_name_for_class_name(class_name, 262 name->utf8_length()); 263 assert(file_name != NULL, "invariant"); 264 265 // Lookup stream for parsing .class file 266 ClassFileStream* stream = NULL; 267 ClassPathEntry* e = find_classpath_entry_from_cache(path, CHECK_NULL); 268 if (e == NULL) { 269 return NULL; 270 } 271 { 272 PerfClassTraceTime vmtimer(perf_sys_class_lookup_time(), 273 ((JavaThread*) THREAD)->get_thread_stat()->perf_timers_addr(), 274 PerfClassTraceTime::CLASS_LOAD); 275 stream = e->open_stream(file_name, CHECK_NULL); 276 } 277 278 if (NULL == stream) { 279 tty->print_cr("Preload Warning: Cannot find %s", class_name); 280 return NULL; 281 } 282 283 assert(stream != NULL, "invariant"); 284 stream->set_verify(true); 285 286 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 287 Handle protection_domain; 288 289 InstanceKlass* result = KlassFactory::create_from_stream(stream, 290 name, 291 loader_data, 292 protection_domain, 293 NULL, // host_klass 294 NULL, // cp_patches 295 THREAD); 296 297 if (HAS_PENDING_EXCEPTION) { 298 tty->print_cr("Preload Error: Failed to load %s", class_name); 299 return NULL; 300 } 301 result->set_shared_classpath_index(UNREGISTERED_INDEX); 302 SystemDictionaryShared::set_shared_class_misc_info(result, stream); 303 return result; 304 } 305 306 struct CachedClassPathEntry { 307 const char* _path; 308 ClassPathEntry* _entry; 309 }; 310 311 static GrowableArray<CachedClassPathEntry>* cached_path_entries = NULL; 312 313 ClassPathEntry* ClassLoaderExt::find_classpath_entry_from_cache(const char* path, TRAPS) { 314 // This is called from dump time so it's single threaded and there's no need for a lock. 315 assert(DumpSharedSpaces && UseAppCDS, "this function is only used with -Xshare:dump and -XX:+UseAppCDS"); 316 if (cached_path_entries == NULL) { 317 cached_path_entries = new (ResourceObj::C_HEAP, mtClass) GrowableArray<CachedClassPathEntry>(20, /*c heap*/ true); 318 } 319 CachedClassPathEntry ccpe; 320 for (int i=0; i<cached_path_entries->length(); i++) { 321 ccpe = cached_path_entries->at(i); 322 if (strcmp(ccpe._path, path) == 0) { 323 if (i != 0) { 324 // Put recent entries at the beginning to speed up searches. 325 cached_path_entries->remove_at(i); 326 cached_path_entries->insert_before(0, ccpe); 327 } 328 return ccpe._entry; 329 } 330 } 331 332 struct stat st; 333 if (os::stat(path, &st) != 0) { 334 // File or directory not found 335 return NULL; 336 } 337 ClassPathEntry* new_entry = NULL; 338 339 new_entry = create_class_path_entry(path, &st, false, false, CHECK_NULL); 340 if (new_entry == NULL) { 341 return NULL; 342 } 343 ccpe._path = strdup(path); 344 ccpe._entry = new_entry; 345 cached_path_entries->insert_before(0, ccpe); 346 return new_entry; 347 } 348 349 Klass* ClassLoaderExt::load_one_class(ClassListParser* parser, TRAPS) { 350 return parser->load_current_class(THREAD); 351 }