1 /* 2 * Copyright (c) 2015, 2023, 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 "cds/cds_globals.hpp" 27 #include "cds/cdsConfig.hpp" 28 #include "cds/dynamicArchive.hpp" 29 #include "cds/filemap.hpp" 30 #include "cds/heapShared.hpp" 31 #include "classfile/classFileParser.hpp" 32 #include "classfile/classLoader.inline.hpp" 33 #include "classfile/classLoaderExt.hpp" 34 #include "classfile/classLoaderData.inline.hpp" 35 #include "classfile/classLoadInfo.hpp" 36 #include "classfile/klassFactory.hpp" 37 #include "classfile/modules.hpp" 38 #include "classfile/systemDictionary.hpp" 39 #include "classfile/vmSymbols.hpp" 40 #include "gc/shared/collectedHeap.hpp" 41 #include "logging/log.hpp" 42 #include "memory/allocation.inline.hpp" 43 #include "memory/resourceArea.hpp" 44 #include "oops/instanceKlass.hpp" 45 #include "oops/klass.inline.hpp" 46 #include "oops/oop.inline.hpp" 47 #include "oops/symbol.hpp" 48 #include "runtime/arguments.hpp" 49 #include "runtime/handles.inline.hpp" 50 #include "runtime/java.hpp" 51 #include "runtime/os.hpp" 52 #include "utilities/checkedCast.hpp" 53 #include "utilities/stringUtils.hpp" 54 55 jshort ClassLoaderExt::_app_class_paths_start_index = ClassLoaderExt::max_classpath_index; 56 jshort ClassLoaderExt::_app_module_paths_start_index = ClassLoaderExt::max_classpath_index; 57 jshort ClassLoaderExt::_max_used_path_index = 0; 58 bool ClassLoaderExt::_has_app_classes = false; 59 bool ClassLoaderExt::_has_platform_classes = false; 60 bool ClassLoaderExt::_has_non_jar_in_classpath = false; 61 62 void ClassLoaderExt::append_boot_classpath(ClassPathEntry* new_entry) { 63 if (UseSharedSpaces) { 64 warning("Sharing is only supported for boot loader classes because bootstrap classpath has been appended"); 65 FileMapInfo::current_info()->set_has_platform_or_app_classes(false); 66 if (DynamicArchive::is_mapped()) { 67 FileMapInfo::dynamic_info()->set_has_platform_or_app_classes(false); 68 } 69 } 70 ClassLoader::add_to_boot_append_entries(new_entry); 71 } 72 73 void ClassLoaderExt::setup_app_search_path(JavaThread* current) { 74 assert(CDSConfig::is_dumping_archive(), "sanity"); 75 int start_index = ClassLoader::num_boot_classpath_entries(); 76 _app_class_paths_start_index = checked_cast<jshort>(start_index); 77 char* app_class_path = os::strdup_check_oom(Arguments::get_appclasspath(), mtClass); 78 79 if (strcmp(app_class_path, ".") == 0) { 80 // This doesn't make any sense, even for AppCDS, so let's skip it. We 81 // don't want to throw an error here because -cp "." is usually assigned 82 // by the launcher when classpath is not specified. 83 trace_class_path("app loader class path (skipped)=", app_class_path); 84 } else { 85 trace_class_path("app loader class path=", app_class_path); 86 ClassLoader::setup_app_search_path(current, app_class_path); 87 } 88 89 os::free(app_class_path); 90 } 91 92 void ClassLoaderExt::process_module_table(JavaThread* current, ModuleEntryTable* met) { 93 ResourceMark rm(current); 94 GrowableArray<char*>* module_paths = new GrowableArray<char*>(5); 95 96 class ModulePathsGatherer : public ModuleClosure { 97 JavaThread* _current; 98 GrowableArray<char*>* _module_paths; 99 public: 100 ModulePathsGatherer(JavaThread* current, GrowableArray<char*>* module_paths) : 101 _current(current), _module_paths(module_paths) {} 102 void do_module(ModuleEntry* m) { 103 char* path = m->location()->as_C_string(); 104 if (strncmp(path, "file:", 5) == 0) { 105 path = ClassLoader::skip_uri_protocol(path); 106 char* path_copy = NEW_RESOURCE_ARRAY(char, strlen(path) + 1); 107 strcpy(path_copy, path); 108 _module_paths->append(path_copy); 109 } 110 } 111 }; 112 113 ModulePathsGatherer gatherer(current, module_paths); 114 { 115 MutexLocker ml(Module_lock); 116 met->modules_do(&gatherer); 117 } 118 119 for (int i = 0; i < module_paths->length(); i++) { 120 ClassLoader::setup_module_search_path(current, module_paths->at(i)); 121 } 122 } 123 124 void ClassLoaderExt::setup_module_paths(JavaThread* current) { 125 assert(CDSConfig::is_dumping_archive(), "sanity"); 126 int start_index = ClassLoader::num_boot_classpath_entries() + 127 ClassLoader::num_app_classpath_entries(); 128 _app_module_paths_start_index = checked_cast<jshort>(start_index); 129 Handle system_class_loader (current, SystemDictionary::java_system_loader()); 130 ModuleEntryTable* met = Modules::get_module_entry_table(system_class_loader); 131 process_module_table(current, met); 132 } 133 134 char* ClassLoaderExt::read_manifest(JavaThread* current, ClassPathEntry* entry, 135 jint *manifest_size, bool clean_text) { 136 const char* name = "META-INF/MANIFEST.MF"; 137 char* manifest; 138 jint size; 139 140 assert(entry->is_jar_file(), "must be"); 141 manifest = (char*) ((ClassPathZipEntry*)entry )->open_entry(current, name, &size, true); 142 143 if (manifest == nullptr) { // No Manifest 144 *manifest_size = 0; 145 return nullptr; 146 } 147 148 149 if (clean_text) { 150 // See http://docs.oracle.com/javase/6/docs/technotes/guides/jar/jar.html#JAR%20Manifest 151 // (1): replace all CR/LF and CR with LF 152 StringUtils::replace_no_expand(manifest, "\r\n", "\n"); 153 154 // (2) remove all new-line continuation (remove all "\n " substrings) 155 StringUtils::replace_no_expand(manifest, "\n ", ""); 156 } 157 158 *manifest_size = (jint)strlen(manifest); 159 return manifest; 160 } 161 162 char* ClassLoaderExt::get_class_path_attr(const char* jar_path, char* manifest, jint manifest_size) { 163 const char* tag = "Class-Path: "; 164 const int tag_len = (int)strlen(tag); 165 char* found = nullptr; 166 char* line_start = manifest; 167 char* end = manifest + manifest_size; 168 169 assert(*end == 0, "must be nul-terminated"); 170 171 while (line_start < end) { 172 char* line_end = strchr(line_start, '\n'); 173 if (line_end == nullptr) { 174 // JAR spec require the manifest file to be terminated by a new line. 175 break; 176 } 177 if (strncmp(tag, line_start, tag_len) == 0) { 178 if (found != nullptr) { 179 // Same behavior as jdk/src/share/classes/java/util/jar/Attributes.java 180 // If duplicated entries are found, the last one is used. 181 log_warning(cds)("Warning: Duplicate name in Manifest: %s.\n" 182 "Ensure that the manifest does not have duplicate entries, and\n" 183 "that blank lines separate individual sections in both your\n" 184 "manifest and in the META-INF/MANIFEST.MF entry in the jar file:\n%s\n", tag, jar_path); 185 } 186 found = line_start + tag_len; 187 assert(found <= line_end, "sanity"); 188 *line_end = '\0'; 189 } 190 line_start = line_end + 1; 191 } 192 return found; 193 } 194 195 void ClassLoaderExt::process_jar_manifest(JavaThread* current, ClassPathEntry* entry) { 196 ResourceMark rm(current); 197 jint manifest_size; 198 char* manifest = read_manifest(current, entry, &manifest_size); 199 200 if (manifest == nullptr) { 201 return; 202 } 203 204 if (strstr(manifest, "Extension-List:") != nullptr) { 205 vm_exit_during_cds_dumping(err_msg("-Xshare:dump does not support Extension-List in JAR manifest: %s", entry->name())); 206 } 207 208 char* cp_attr = get_class_path_attr(entry->name(), manifest, manifest_size); 209 210 if (cp_attr != nullptr && strlen(cp_attr) > 0) { 211 trace_class_path("found Class-Path: ", cp_attr); 212 213 char sep = os::file_separator()[0]; 214 const char* dir_name = entry->name(); 215 const char* dir_tail = strrchr(dir_name, sep); 216 int dir_len; 217 if (dir_tail == nullptr) { 218 dir_len = 0; 219 } else { 220 dir_len = pointer_delta_as_int(dir_tail, dir_name) + 1; 221 } 222 223 // Split the cp_attr by spaces, and add each file 224 char* file_start = cp_attr; 225 char* end = file_start + strlen(file_start); 226 227 while (file_start < end) { 228 char* file_end = strchr(file_start, ' '); 229 if (file_end != nullptr) { 230 *file_end = 0; 231 file_end += 1; 232 } else { 233 file_end = end; 234 } 235 236 size_t name_len = strlen(file_start); 237 if (name_len > 0) { 238 ResourceMark rm(current); 239 size_t libname_len = dir_len + name_len; 240 char* libname = NEW_RESOURCE_ARRAY(char, libname_len + 1); 241 int n = os::snprintf(libname, libname_len + 1, "%.*s%s", dir_len, dir_name, file_start); 242 assert((size_t)n == libname_len, "Unexpected number of characters in string"); 243 if (ClassLoader::update_class_path_entry_list(current, libname, true, false, true /* from_class_path_attr */)) { 244 trace_class_path("library = ", libname); 245 } else { 246 trace_class_path("library (non-existent) = ", libname); 247 FileMapInfo::record_non_existent_class_path_entry(libname); 248 } 249 } 250 251 file_start = file_end; 252 } 253 } 254 } 255 256 void ClassLoaderExt::setup_search_paths(JavaThread* current) { 257 ClassLoaderExt::setup_app_search_path(current); 258 } 259 260 void ClassLoaderExt::record_result(const s2 classpath_index, InstanceKlass* result, bool redefined) { 261 assert(CDSConfig::is_dumping_archive(), "sanity"); 262 263 // We need to remember where the class comes from during dumping. 264 oop loader = result->class_loader(); 265 s2 classloader_type = ClassLoader::BOOT_LOADER; 266 if (SystemDictionary::is_system_class_loader(loader)) { 267 classloader_type = ClassLoader::APP_LOADER; 268 ClassLoaderExt::set_has_app_classes(); 269 } else if (SystemDictionary::is_platform_class_loader(loader)) { 270 classloader_type = ClassLoader::PLATFORM_LOADER; 271 ClassLoaderExt::set_has_platform_classes(); 272 } 273 if (classpath_index > ClassLoaderExt::max_used_path_index()) { 274 ClassLoaderExt::set_max_used_path_index(classpath_index); 275 } 276 result->set_shared_classpath_index(classpath_index); 277 result->set_shared_class_loader_type(classloader_type); 278 #if INCLUDE_CDS_JAVA_HEAP 279 if (CDSConfig::is_dumping_heap() && AllowArchivingWithJavaAgent && classloader_type == ClassLoader::BOOT_LOADER && 280 classpath_index < 0 && redefined) { 281 // When dumping the heap (which happens only during static dump), classes for the built-in 282 // loaders are always loaded from known locations (jimage, classpath or modulepath), 283 // so classpath_index should always be >= 0. 284 // The only exception is when a java agent is used during dump time (for testing 285 // purposes only). If a class is transformed by the agent, the CodeSource of 286 // this class may point to an unknown location. This may break heap object archiving, 287 // which requires all the boot classes to be from known locations. This is an 288 // uncommon scenario (even in test cases). Let's simply disable heap object archiving. 289 ResourceMark rm; 290 log_warning(cds)("CDS heap objects cannot be written because class %s maybe modified by ClassFileLoadHook.", 291 result->external_name()); 292 HeapShared::disable_writing(); 293 } 294 #endif // INCLUDE_CDS_JAVA_HEAP 295 }