1 /* 2 * Copyright (c) 2014, 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 #ifndef SHARE_VM_CLASSFILE_CLASSLOADEREXT_HPP 26 #define SHARE_VM_CLASSFILE_CLASSLOADEREXT_HPP 27 28 #include "classfile/classLoader.hpp" 29 #include "classfile/moduleEntry.hpp" 30 #include "utilities/macros.hpp" 31 32 CDS_ONLY(class SharedPathsMiscInfoExt;) 33 CDS_ONLY(class ClassListParser;) 34 35 class ClassLoaderExt: public ClassLoader { // AllStatic 36 public: 37 enum SomeConstants { 38 max_classpath_index = 0x7fff 39 }; 40 // ClassLoaderExt::Context -- 41 // 42 // This is used by DumpSharedSpaces only - it enforces the same classloader 43 // delegation model as would be in run-time. I.e., 44 // + classes defined by the NULL class loader cannot load classes in the PLATFORM or APP paths. 45 // + classes defined by the PLATFORM class loader cannot load classes in the APP paths. 46 class Context { 47 static Thread* _dump_thread; 48 const char* _class_name; 49 const char* _file_name; 50 public: 51 const char* class_name() { 52 return _class_name; 53 } 54 const char* file_name() { 55 return _file_name; 56 } 57 58 Context(const char* class_name, const char* file_name, TRAPS) { 59 _class_name = class_name; 60 _file_name = file_name; 61 #if INCLUDE_CDS 62 if (!DumpSharedSpaces && !UseSharedSpaces) { 63 // Must not modify _app_class_paths_start_index if we're not using CDS. 64 assert(_app_class_paths_start_index == ClassLoaderExt::max_classpath_index, "must be"); 65 } 66 #endif 67 } 68 69 bool should_verify(int classpath_index) { 70 CDS_ONLY(return (classpath_index >= _app_class_paths_start_index);) 71 NOT_CDS(return false;) 72 } 73 74 void record_result(Symbol* class_name, 75 const s2 classpath_index, 76 InstanceKlass* result, 77 TRAPS) { 78 #if INCLUDE_CDS 79 ClassLoaderExt::record_result(this, class_name, classpath_index, result, THREAD); 80 #endif 81 } 82 83 ~Context() { 84 #if INCLUDE_CDS 85 if (!DumpSharedSpaces && !UseSharedSpaces) { 86 // Must not modify app_class_paths_start_index if we're not using CDS. 87 assert(_app_class_paths_start_index == ClassLoaderExt::max_classpath_index, "must be"); 88 } 89 #endif 90 } 91 }; // end ClassLoaderExt::Context 92 93 private: 94 #if INCLUDE_CDS 95 static char* get_class_path_attr(const char* jar_path, char* manifest, jint manifest_size); 96 static void setup_app_search_path(); // Only when -Xshare:dump 97 static void process_module_table(ModuleEntryTable* met, TRAPS); 98 static void setup_module_search_path(TRAPS); 99 static SharedPathsMiscInfoExt* shared_paths_misc_info() { 100 return (SharedPathsMiscInfoExt*)_shared_paths_misc_info; 101 } 102 // index of first app JAR in shared classpath entry table 103 static jshort _app_class_paths_start_index; 104 // index of first modular JAR in shared modulepath entry table 105 static jshort _app_module_paths_start_index; 106 107 static bool _has_app_classes; 108 static bool _has_platform_classes; 109 #endif 110 111 public: 112 CDS_ONLY(static void process_jar_manifest(ClassPathEntry* entry, bool check_for_duplicates);) 113 114 // Called by JVMTI code to add boot classpath 115 static void append_boot_classpath(ClassPathEntry* new_entry) { 116 #if INCLUDE_CDS 117 if (UseAppCDS) { 118 warning("UseAppCDS is disabled because bootstrap classpath has been appended"); 119 UseAppCDS = false; 120 } 121 #endif 122 ClassLoader::add_to_boot_append_entries(new_entry); 123 } 124 125 static void setup_search_paths() NOT_CDS_RETURN; 126 static void setup_module_paths(TRAPS) NOT_CDS_RETURN; 127 128 #if INCLUDE_CDS 129 private: 130 static char* read_manifest(ClassPathEntry* entry, jint *manifest_size, bool clean_text, TRAPS); 131 static ClassPathEntry* find_classpath_entry_from_cache(const char* path, TRAPS); 132 133 public: 134 static char* read_manifest(ClassPathEntry* entry, jint *manifest_size, TRAPS) { 135 // Remove all the new-line continuations (which wrap long lines at 72 characters, see 136 // http://docs.oracle.com/javase/6/docs/technotes/guides/jar/jar.html#JAR%20Manifest), so 137 // that the manifest is easier to parse. 138 return read_manifest(entry, manifest_size, true, THREAD); 139 } 140 static char* read_raw_manifest(ClassPathEntry* entry, jint *manifest_size, TRAPS) { 141 // Do not remove new-line continuations, so we can easily pass it as an argument to 142 // java.util.jar.Manifest.getManifest() at run-time. 143 return read_manifest(entry, manifest_size, false, THREAD); 144 } 145 146 static void finalize_shared_paths_misc_info(); 147 148 static jshort app_class_paths_start_index() { return _app_class_paths_start_index; } 149 150 static jshort app_module_paths_start_index() { return _app_module_paths_start_index; } 151 152 static void init_paths_start_index(jshort app_start) { 153 _app_class_paths_start_index = app_start; 154 } 155 156 static void init_app_module_paths_start_index(jshort module_start) { 157 _app_module_paths_start_index = module_start; 158 } 159 160 static bool is_boot_classpath(int classpath_index) { 161 return classpath_index < _app_class_paths_start_index; 162 } 163 164 static bool has_platform_or_app_classes() { 165 return _has_app_classes || _has_platform_classes; 166 } 167 168 static void record_result(class ClassLoaderExt::Context *context, 169 Symbol* class_name, 170 const s2 classpath_index, 171 InstanceKlass* result, TRAPS); 172 static InstanceKlass* load_class(Symbol* h_name, const char* path, TRAPS); 173 static Klass* load_one_class(ClassListParser* parser, TRAPS); 174 static void set_has_app_classes() { 175 _has_app_classes = true; 176 } 177 static void set_has_platform_classes() { 178 _has_platform_classes = true; 179 } 180 #endif 181 }; 182 183 #endif // SHARE_VM_CLASSFILE_CLASSLOADEREXT_HPP