/* * Copyright (c) 2014, 2019, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "precompiled.hpp" #include "classfile/classFileStream.hpp" #include "classfile/classListParser.hpp" #include "classfile/classLoader.hpp" #include "classfile/classLoaderData.inline.hpp" #include "classfile/classLoaderDataGraph.hpp" #include "classfile/classLoaderExt.hpp" #include "classfile/dictionary.hpp" #include "classfile/javaClasses.hpp" #include "classfile/symbolTable.hpp" #include "classfile/systemDictionary.hpp" #include "classfile/systemDictionaryShared.hpp" #include "classfile/verificationType.hpp" #include "classfile/vmSymbols.hpp" #include "logging/log.hpp" #include "memory/allocation.hpp" #include "memory/filemap.hpp" #include "memory/metadataFactory.hpp" #include "memory/metaspaceClosure.hpp" #include "memory/oopFactory.hpp" #include "memory/resourceArea.hpp" #include "memory/universe.hpp" #include "memory/dynamicArchive.hpp" #include "oops/instanceKlass.hpp" #include "oops/klass.inline.hpp" #include "oops/objArrayOop.inline.hpp" #include "oops/oop.inline.hpp" #include "oops/typeArrayOop.inline.hpp" #include "runtime/handles.inline.hpp" #include "runtime/java.hpp" #include "runtime/javaCalls.hpp" #include "runtime/mutexLocker.hpp" #include "utilities/hashtable.inline.hpp" #include "utilities/resourceHash.hpp" #include "utilities/stringUtils.hpp" objArrayOop SystemDictionaryShared::_shared_protection_domains = NULL; objArrayOop SystemDictionaryShared::_shared_jar_urls = NULL; objArrayOop SystemDictionaryShared::_shared_jar_manifests = NULL; DEBUG_ONLY(bool SystemDictionaryShared::_no_class_loading_should_happen = false;) class DumpTimeSharedClassInfo: public CHeapObj { bool _excluded; public: struct DTConstraint { Symbol* _name; Symbol* _from_name; DTConstraint() : _name(NULL), _from_name(NULL) {} DTConstraint(Symbol* n, Symbol* fn) : _name(n), _from_name(fn) {} }; InstanceKlass* _klass; int _id; int _clsfile_size; int _clsfile_crc32; GrowableArray* _verifier_constraints; GrowableArray* _verifier_constraint_flags; DumpTimeSharedClassInfo() { _klass = NULL; _id = -1; _clsfile_size = -1; _clsfile_crc32 = -1; _excluded = false; _verifier_constraints = NULL; _verifier_constraint_flags = NULL; } void add_verification_constraint(InstanceKlass* k, Symbol* name, Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object); bool is_builtin() { return SystemDictionaryShared::is_builtin(_klass); } int num_constraints() { if (_verifier_constraint_flags != NULL) { return _verifier_constraint_flags->length(); } else { return 0; } } void metaspace_pointers_do(MetaspaceClosure* it) { it->push(&_klass); if (_verifier_constraints != NULL) { for (int i = 0; i < _verifier_constraints->length(); i++) { DTConstraint* cons = _verifier_constraints->adr_at(i); it->push(&cons->_name); it->push(&cons->_from_name); } } } void set_excluded() { _excluded = true; } bool is_excluded() { // _klass may become NULL due to DynamicArchiveBuilder::set_to_null return _excluded || _klass == NULL; } }; class DumpTimeSharedClassTable: public ResourceHashtable< InstanceKlass*, DumpTimeSharedClassInfo, primitive_hash, primitive_equals, 15889, // prime number ResourceObj::C_HEAP> { int _builtin_count; int _unregistered_count; public: DumpTimeSharedClassInfo* find_or_allocate_info_for(InstanceKlass* k) { DumpTimeSharedClassInfo* p = get(k); if (p == NULL) { assert(!SystemDictionaryShared::no_class_loading_should_happen(), "no new classes can be loaded while dumping archive"); put(k, DumpTimeSharedClassInfo()); p = get(k); assert(p != NULL, "sanity"); p->_klass = k; } return p; } class CountClassByCategory : StackObj { DumpTimeSharedClassTable* _table; public: CountClassByCategory(DumpTimeSharedClassTable* table) : _table(table) {} bool do_entry(InstanceKlass* k, DumpTimeSharedClassInfo& info) { if (!info.is_excluded()) { if (info.is_builtin()) { ++ _table->_builtin_count; } else { ++ _table->_unregistered_count; } } return true; // keep on iterating } }; void update_counts() { _builtin_count = 0; _unregistered_count = 0; CountClassByCategory counter(this); iterate(&counter); } int count_of(bool is_builtin) const { if (is_builtin) { return _builtin_count; } else { return _unregistered_count; } } }; class RunTimeSharedClassInfo { public: struct CrcInfo { int _clsfile_size; int _clsfile_crc32; }; // This is different than DumpTimeSharedClassInfo::DTConstraint. We use // u4 instead of Symbol* to save space on 64-bit CPU. struct RTConstraint { u4 _name; u4 _from_name; }; InstanceKlass* _klass; int _num_constraints; // optional CrcInfo _crc; (only for UNREGISTERED classes) // optional RTConstraint _verifier_constraints[_num_constraints] // optional char _verifier_constraint_flags[_num_constraints] private: static size_t header_size_size() { return sizeof(RunTimeSharedClassInfo); } static size_t crc_size(InstanceKlass* klass) { if (!SystemDictionaryShared::is_builtin(klass)) { return sizeof(CrcInfo); } else { return 0; } } static size_t verifier_constraints_size(int num_constraints) { return sizeof(RTConstraint) * num_constraints; } static size_t verifier_constraint_flags_size(int num_constraints) { return sizeof(char) * num_constraints; } public: static size_t byte_size(InstanceKlass* klass, int num_constraints) { return header_size_size() + crc_size(klass) + verifier_constraints_size(num_constraints) + verifier_constraint_flags_size(num_constraints); } private: size_t crc_offset() const { return header_size_size(); } size_t verifier_constraints_offset() const { return crc_offset() + crc_size(_klass); } size_t verifier_constraint_flags_offset() const { return verifier_constraints_offset() + verifier_constraints_size(_num_constraints); } void check_constraint_offset(int i) const { assert(0 <= i && i < _num_constraints, "sanity"); } public: CrcInfo* crc() const { assert(crc_size(_klass) > 0, "must be"); return (CrcInfo*)(address(this) + crc_offset()); } RTConstraint* verifier_constraints() { assert(_num_constraints > 0, "sanity"); return (RTConstraint*)(address(this) + verifier_constraints_offset()); } RTConstraint* verifier_constraint_at(int i) { check_constraint_offset(i); return verifier_constraints() + i; } char* verifier_constraint_flags() { assert(_num_constraints > 0, "sanity"); return (char*)(address(this) + verifier_constraint_flags_offset()); } static u4 object_delta_u4(Symbol* sym) { if (DynamicDumpSharedSpaces) { sym = DynamicArchive::original_to_target(sym); } return MetaspaceShared::object_delta_u4(sym); } void init(DumpTimeSharedClassInfo& info) { _klass = info._klass; if (!SystemDictionaryShared::is_builtin(_klass)) { CrcInfo* c = crc(); c->_clsfile_size = info._clsfile_size; c->_clsfile_crc32 = info._clsfile_crc32; } _num_constraints = info.num_constraints(); if (_num_constraints > 0) { RTConstraint* constraints = verifier_constraints(); char* flags = verifier_constraint_flags(); int i; for (i = 0; i < _num_constraints; i++) { constraints[i]._name = object_delta_u4(info._verifier_constraints->at(i)._name); constraints[i]._from_name = object_delta_u4(info._verifier_constraints->at(i)._from_name); } for (i = 0; i < _num_constraints; i++) { flags[i] = info._verifier_constraint_flags->at(i); } } if (DynamicDumpSharedSpaces) { _klass = DynamicArchive::original_to_target(info._klass); } } bool matches(int clsfile_size, int clsfile_crc32) const { return crc()->_clsfile_size == clsfile_size && crc()->_clsfile_crc32 == clsfile_crc32; } Symbol* get_constraint_name(int i) { return (Symbol*)(SharedBaseAddress + verifier_constraint_at(i)->_name); } Symbol* get_constraint_from_name(int i) { return (Symbol*)(SharedBaseAddress + verifier_constraint_at(i)->_from_name); } char get_constraint_flag(int i) { check_constraint_offset(i); return verifier_constraint_flags()[i]; } private: // ArchiveCompactor::allocate() has reserved a pointer immediately before // archived InstanceKlasses. We can use this slot to do a quick // lookup of InstanceKlass* -> RunTimeSharedClassInfo* without // building a new hashtable. // // info_pointer_addr(klass) --> 0x0100 RunTimeSharedClassInfo* // InstanceKlass* klass --> 0x0108 // 0x0110 fields from Klass ... static RunTimeSharedClassInfo** info_pointer_addr(InstanceKlass* klass) { return &((RunTimeSharedClassInfo**)klass)[-1]; } public: static RunTimeSharedClassInfo* get_for(InstanceKlass* klass) { return *info_pointer_addr(klass); } static void set_for(InstanceKlass* klass, RunTimeSharedClassInfo* record) { if (DynamicDumpSharedSpaces) { klass = DynamicArchive::original_to_buffer(klass); *info_pointer_addr(klass) = DynamicArchive::buffer_to_target(record); } else { *info_pointer_addr(klass) = record; } } // Used by RunTimeSharedDictionary to implement OffsetCompactHashtable::EQUALS static inline bool EQUALS( const RunTimeSharedClassInfo* value, Symbol* key, int len_unused) { return (value->_klass->name() == key); } }; class RunTimeSharedDictionary : public OffsetCompactHashtable< Symbol*, const RunTimeSharedClassInfo*, RunTimeSharedClassInfo::EQUALS> {}; static DumpTimeSharedClassTable* _dumptime_table = NULL; // SystemDictionaries in the base layer static archive static RunTimeSharedDictionary _builtin_dictionary; static RunTimeSharedDictionary _unregistered_dictionary; // SystemDictionaries in the top layer dynamic archive static RunTimeSharedDictionary _dynamic_builtin_dictionary; static RunTimeSharedDictionary _dynamic_unregistered_dictionary; oop SystemDictionaryShared::shared_protection_domain(int index) { return _shared_protection_domains->obj_at(index); } oop SystemDictionaryShared::shared_jar_url(int index) { return _shared_jar_urls->obj_at(index); } oop SystemDictionaryShared::shared_jar_manifest(int index) { return _shared_jar_manifests->obj_at(index); } Handle SystemDictionaryShared::get_shared_jar_manifest(int shared_path_index, TRAPS) { Handle manifest ; if (shared_jar_manifest(shared_path_index) == NULL) { SharedClassPathEntry* ent = FileMapInfo::shared_path(shared_path_index); long size = ent->manifest_size(); if (size <= 0) { return Handle(); } // ByteArrayInputStream bais = new ByteArrayInputStream(buf); const char* src = ent->manifest(); assert(src != NULL, "No Manifest data"); typeArrayOop buf = oopFactory::new_byteArray(size, CHECK_NH); typeArrayHandle bufhandle(THREAD, buf); ArrayAccess<>::arraycopy_from_native(reinterpret_cast(src), buf, typeArrayOopDesc::element_offset(0), size); Handle bais = JavaCalls::construct_new_instance(SystemDictionary::ByteArrayInputStream_klass(), vmSymbols::byte_array_void_signature(), bufhandle, CHECK_NH); // manifest = new Manifest(bais) manifest = JavaCalls::construct_new_instance(SystemDictionary::Jar_Manifest_klass(), vmSymbols::input_stream_void_signature(), bais, CHECK_NH); atomic_set_shared_jar_manifest(shared_path_index, manifest()); } manifest = Handle(THREAD, shared_jar_manifest(shared_path_index)); assert(manifest.not_null(), "sanity"); return manifest; } Handle SystemDictionaryShared::get_shared_jar_url(int shared_path_index, TRAPS) { Handle url_h; if (shared_jar_url(shared_path_index) == NULL) { JavaValue result(T_OBJECT); const char* path = FileMapInfo::shared_path_name(shared_path_index); Handle path_string = java_lang_String::create_from_str(path, CHECK_(url_h)); Klass* classLoaders_klass = SystemDictionary::jdk_internal_loader_ClassLoaders_klass(); JavaCalls::call_static(&result, classLoaders_klass, vmSymbols::toFileURL_name(), vmSymbols::toFileURL_signature(), path_string, CHECK_(url_h)); atomic_set_shared_jar_url(shared_path_index, (oop)result.get_jobject()); } url_h = Handle(THREAD, shared_jar_url(shared_path_index)); assert(url_h.not_null(), "sanity"); return url_h; } Handle SystemDictionaryShared::get_package_name(Symbol* class_name, TRAPS) { ResourceMark rm(THREAD); Handle pkgname_string; char* pkgname = (char*) ClassLoader::package_from_name((const char*) class_name->as_C_string()); if (pkgname != NULL) { // Package prefix found StringUtils::replace_no_expand(pkgname, "/", "."); pkgname_string = java_lang_String::create_from_str(pkgname, CHECK_(pkgname_string)); } return pkgname_string; } // Define Package for shared app classes from JAR file and also checks for // package sealing (all done in Java code) // See http://docs.oracle.com/javase/tutorial/deployment/jar/sealman.html void SystemDictionaryShared::define_shared_package(Symbol* class_name, Handle class_loader, Handle manifest, Handle url, TRAPS) { assert(SystemDictionary::is_system_class_loader(class_loader()), "unexpected class loader"); // get_package_name() returns a NULL handle if the class is in unnamed package Handle pkgname_string = get_package_name(class_name, CHECK); if (pkgname_string.not_null()) { Klass* app_classLoader_klass = SystemDictionary::jdk_internal_loader_ClassLoaders_AppClassLoader_klass(); JavaValue result(T_OBJECT); JavaCallArguments args(3); args.set_receiver(class_loader); args.push_oop(pkgname_string); args.push_oop(manifest); args.push_oop(url); JavaCalls::call_virtual(&result, app_classLoader_klass, vmSymbols::defineOrCheckPackage_name(), vmSymbols::defineOrCheckPackage_signature(), &args, CHECK); } } // Define Package for shared app/platform classes from named module void SystemDictionaryShared::define_shared_package(Symbol* class_name, Handle class_loader, ModuleEntry* mod_entry, TRAPS) { assert(mod_entry != NULL, "module_entry should not be NULL"); Handle module_handle(THREAD, mod_entry->module()); Handle pkg_name = get_package_name(class_name, CHECK); assert(pkg_name.not_null(), "Package should not be null for class in named module"); Klass* classLoader_klass; if (SystemDictionary::is_system_class_loader(class_loader())) { classLoader_klass = SystemDictionary::jdk_internal_loader_ClassLoaders_AppClassLoader_klass(); } else { assert(SystemDictionary::is_platform_class_loader(class_loader()), "unexpected classloader"); classLoader_klass = SystemDictionary::jdk_internal_loader_ClassLoaders_PlatformClassLoader_klass(); } JavaValue result(T_OBJECT); JavaCallArguments args(2); args.set_receiver(class_loader); args.push_oop(pkg_name); args.push_oop(module_handle); JavaCalls::call_virtual(&result, classLoader_klass, vmSymbols::definePackage_name(), vmSymbols::definePackage_signature(), &args, CHECK); } // Get the ProtectionDomain associated with the CodeSource from the classloader. Handle SystemDictionaryShared::get_protection_domain_from_classloader(Handle class_loader, Handle url, TRAPS) { // CodeSource cs = new CodeSource(url, null); Handle cs = JavaCalls::construct_new_instance(SystemDictionary::CodeSource_klass(), vmSymbols::url_code_signer_array_void_signature(), url, Handle(), CHECK_NH); // protection_domain = SecureClassLoader.getProtectionDomain(cs); Klass* secureClassLoader_klass = SystemDictionary::SecureClassLoader_klass(); JavaValue obj_result(T_OBJECT); JavaCalls::call_virtual(&obj_result, class_loader, secureClassLoader_klass, vmSymbols::getProtectionDomain_name(), vmSymbols::getProtectionDomain_signature(), cs, CHECK_NH); return Handle(THREAD, (oop)obj_result.get_jobject()); } // Returns the ProtectionDomain associated with the JAR file identified by the url. Handle SystemDictionaryShared::get_shared_protection_domain(Handle class_loader, int shared_path_index, Handle url, TRAPS) { Handle protection_domain; if (shared_protection_domain(shared_path_index) == NULL) { Handle pd = get_protection_domain_from_classloader(class_loader, url, THREAD); atomic_set_shared_protection_domain(shared_path_index, pd()); } // Acquire from the cache because if another thread beats the current one to // set the shared protection_domain and the atomic_set fails, the current thread // needs to get the updated protection_domain from the cache. protection_domain = Handle(THREAD, shared_protection_domain(shared_path_index)); assert(protection_domain.not_null(), "sanity"); return protection_domain; } // Returns the ProtectionDomain associated with the moduleEntry. Handle SystemDictionaryShared::get_shared_protection_domain(Handle class_loader, ModuleEntry* mod, TRAPS) { ClassLoaderData *loader_data = mod->loader_data(); if (mod->shared_protection_domain() == NULL) { Symbol* location = mod->location(); if (location != NULL) { Handle location_string = java_lang_String::create_from_symbol( location, CHECK_NH); Handle url; JavaValue result(T_OBJECT); if (location->starts_with("jrt:/")) { url = JavaCalls::construct_new_instance(SystemDictionary::URL_klass(), vmSymbols::string_void_signature(), location_string, CHECK_NH); } else { Klass* classLoaders_klass = SystemDictionary::jdk_internal_loader_ClassLoaders_klass(); JavaCalls::call_static(&result, classLoaders_klass, vmSymbols::toFileURL_name(), vmSymbols::toFileURL_signature(), location_string, CHECK_NH); url = Handle(THREAD, (oop)result.get_jobject()); } Handle pd = get_protection_domain_from_classloader(class_loader, url, CHECK_NH); mod->set_shared_protection_domain(loader_data, pd); } } Handle protection_domain(THREAD, mod->shared_protection_domain()); assert(protection_domain.not_null(), "sanity"); return protection_domain; } // Initializes the java.lang.Package and java.security.ProtectionDomain objects associated with // the given InstanceKlass. // Returns the ProtectionDomain for the InstanceKlass. Handle SystemDictionaryShared::init_security_info(Handle class_loader, InstanceKlass* ik, TRAPS) { Handle pd; if (ik != NULL) { int index = ik->shared_classpath_index(); assert(index >= 0, "Sanity"); SharedClassPathEntry* ent = FileMapInfo::shared_path(index); Symbol* class_name = ik->name(); if (ent->is_modules_image()) { // For shared app/platform classes originated from the run-time image: // The ProtectionDomains are cached in the corresponding ModuleEntries // for fast access by the VM. ResourceMark rm; ClassLoaderData *loader_data = ClassLoaderData::class_loader_data(class_loader()); PackageEntryTable* pkgEntryTable = loader_data->packages(); TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK_(pd)); if (pkg_name != NULL) { PackageEntry* pkg_entry = pkgEntryTable->lookup_only(pkg_name); if (pkg_entry != NULL) { ModuleEntry* mod_entry = pkg_entry->module(); pd = get_shared_protection_domain(class_loader, mod_entry, THREAD); define_shared_package(class_name, class_loader, mod_entry, CHECK_(pd)); } } } else { // For shared app/platform classes originated from JAR files on the class path: // Each of the 3 SystemDictionaryShared::_shared_xxx arrays has the same length // as the shared classpath table in the shared archive (see // FileMap::_shared_path_table in filemap.hpp for details). // // If a shared InstanceKlass k is loaded from the class path, let // // index = k->shared_classpath_index(): // // FileMap::_shared_path_table[index] identifies the JAR file that contains k. // // k's protection domain is: // // ProtectionDomain pd = _shared_protection_domains[index]; // // and k's Package is initialized using // // manifest = _shared_jar_manifests[index]; // url = _shared_jar_urls[index]; // define_shared_package(class_name, class_loader, manifest, url, CHECK_(pd)); // // Note that if an element of these 3 _shared_xxx arrays is NULL, it will be initialized by // the corresponding SystemDictionaryShared::get_shared_xxx() function. Handle manifest = get_shared_jar_manifest(index, CHECK_(pd)); Handle url = get_shared_jar_url(index, CHECK_(pd)); define_shared_package(class_name, class_loader, manifest, url, CHECK_(pd)); pd = get_shared_protection_domain(class_loader, index, url, CHECK_(pd)); } } return pd; } bool SystemDictionaryShared::is_sharing_possible(ClassLoaderData* loader_data) { oop class_loader = loader_data->class_loader(); return (class_loader == NULL || SystemDictionary::is_system_class_loader(class_loader) || SystemDictionary::is_platform_class_loader(class_loader)); } // Currently AppCDS only archives classes from the run-time image, the // -Xbootclasspath/a path, the class path, and the module path. // // Check if a shared class can be loaded by the specific classloader. Following // are the "visible" archived classes for different classloaders. // // NULL classloader: // - see SystemDictionary::is_shared_class_visible() // Platform classloader: // - Module class from runtime image. ModuleEntry must be defined in the // classloader. // App classloader: // - Module Class from runtime image and module path. ModuleEntry must be defined in the // classloader. // - Class from -cp. The class must have no PackageEntry defined in any of the // boot/platform/app classloader, or must be in the unnamed module defined in the // AppClassLoader. bool SystemDictionaryShared::is_shared_class_visible_for_classloader( InstanceKlass* ik, Handle class_loader, const char* pkg_string, Symbol* pkg_name, PackageEntry* pkg_entry, ModuleEntry* mod_entry, TRAPS) { assert(class_loader.not_null(), "Class loader should not be NULL"); assert(Universe::is_module_initialized(), "Module system is not initialized"); ResourceMark rm(THREAD); int path_index = ik->shared_classpath_index(); SharedClassPathEntry* ent = (SharedClassPathEntry*)FileMapInfo::shared_path(path_index); if (SystemDictionary::is_platform_class_loader(class_loader())) { assert(ent != NULL, "shared class for PlatformClassLoader should have valid SharedClassPathEntry"); // The PlatformClassLoader can only load archived class originated from the // run-time image. The class' PackageEntry/ModuleEntry must be // defined by the PlatformClassLoader. if (mod_entry != NULL) { // PackageEntry/ModuleEntry is found in the classloader. Check if the // ModuleEntry's location agrees with the archived class' origination. if (ent->is_modules_image() && mod_entry->location()->starts_with("jrt:")) { return true; // Module class from the runtime image } } } else if (SystemDictionary::is_system_class_loader(class_loader())) { assert(ent != NULL, "shared class for system loader should have valid SharedClassPathEntry"); if (pkg_string == NULL) { // The archived class is in the unnamed package. Currently, the boot image // does not contain any class in the unnamed package. assert(!ent->is_modules_image(), "Class in the unnamed package must be from the classpath"); if (path_index >= ClassLoaderExt::app_class_paths_start_index()) { assert(path_index < ClassLoaderExt::app_module_paths_start_index(), "invalid path_index"); return true; } } else { // Check if this is from a PackageEntry/ModuleEntry defined in the AppClassloader. if (pkg_entry == NULL) { // It's not guaranteed that the class is from the classpath if the // PackageEntry cannot be found from the AppClassloader. Need to check // the boot and platform classloader as well. if (get_package_entry(pkg_name, ClassLoaderData::class_loader_data_or_null(SystemDictionary::java_platform_loader())) == NULL && get_package_entry(pkg_name, ClassLoaderData::the_null_class_loader_data()) == NULL) { // The PackageEntry is not defined in any of the boot/platform/app classloaders. // The archived class must from -cp path and not from the runtime image. if (!ent->is_modules_image() && path_index >= ClassLoaderExt::app_class_paths_start_index() && path_index < ClassLoaderExt::app_module_paths_start_index()) { return true; } } } else if (mod_entry != NULL) { // The package/module is defined in the AppClassLoader. We support // archiving application module class from the runtime image or from // a named module from a module path. // Packages from the -cp path are in the unnamed_module. if (ent->is_modules_image() && mod_entry->location()->starts_with("jrt:")) { // shared module class from runtime image return true; } else if (pkg_entry->in_unnamed_module() && path_index >= ClassLoaderExt::app_class_paths_start_index() && path_index < ClassLoaderExt::app_module_paths_start_index()) { // shared class from -cp DEBUG_ONLY( \ ClassLoaderData* loader_data = class_loader_data(class_loader); \ assert(mod_entry == loader_data->unnamed_module(), "the unnamed module is not defined in the classloader");) return true; } else { if(!pkg_entry->in_unnamed_module() && (path_index >= ClassLoaderExt::app_module_paths_start_index())&& (path_index < FileMapInfo::get_number_of_shared_paths()) && (strcmp(ent->name(), ClassLoader::skip_uri_protocol(mod_entry->location()->as_C_string())) == 0)) { // shared module class from module path return true; } else { assert(path_index < FileMapInfo::get_number_of_shared_paths(), "invalid path_index"); } } } } } else { // TEMP: if a shared class can be found by a custom loader, consider it visible now. // FIXME: is this actually correct? return true; } return false; } bool SystemDictionaryShared::has_platform_or_app_classes() { if (FileMapInfo::current_info()->has_platform_or_app_classes()) { return true; } if (DynamicArchive::is_mapped() && FileMapInfo::dynamic_info()->has_platform_or_app_classes()) { return true; } return false; } // The following stack shows how this code is reached: // // [0] SystemDictionaryShared::find_or_load_shared_class() // [1] JVM_FindLoadedClass // [2] java.lang.ClassLoader.findLoadedClass0() // [3] java.lang.ClassLoader.findLoadedClass() // [4] jdk.internal.loader.BuiltinClassLoader.loadClassOrNull() // [5] jdk.internal.loader.BuiltinClassLoader.loadClass() // [6] jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(), or // jdk.internal.loader.ClassLoaders$PlatformClassLoader.loadClass() // // AppCDS supports fast class loading for these 2 built-in class loaders: // jdk.internal.loader.ClassLoaders$PlatformClassLoader // jdk.internal.loader.ClassLoaders$AppClassLoader // with the following assumptions (based on the JDK core library source code): // // [a] these two loaders use the BuiltinClassLoader.loadClassOrNull() to // load the named class. // [b] BuiltinClassLoader.loadClassOrNull() first calls findLoadedClass(name). // [c] At this point, if we can find the named class inside the // shared_dictionary, we can perform further checks (see // is_shared_class_visible_for_classloader() to ensure that this class // was loaded by the same class loader during dump time. // // Given these assumptions, we intercept the findLoadedClass() call to invoke // SystemDictionaryShared::find_or_load_shared_class() to load the shared class from // the archive for the 2 built-in class loaders. This way, // we can improve start-up because we avoid decoding the classfile, // and avoid delegating to the parent loader. // // NOTE: there's a lot of assumption about the Java code. If any of that change, this // needs to be redesigned. InstanceKlass* SystemDictionaryShared::find_or_load_shared_class( Symbol* name, Handle class_loader, TRAPS) { InstanceKlass* k = NULL; if (UseSharedSpaces) { if (!has_platform_or_app_classes()) { return NULL; } if (SystemDictionary::is_system_class_loader(class_loader()) || SystemDictionary::is_platform_class_loader(class_loader())) { // Fix for 4474172; see evaluation for more details class_loader = Handle( THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); ClassLoaderData *loader_data = register_loader(class_loader); Dictionary* dictionary = loader_data->dictionary(); unsigned int d_hash = dictionary->compute_hash(name); bool DoObjectLock = true; if (is_parallelCapable(class_loader)) { DoObjectLock = false; } // Make sure we are synchronized on the class loader before we proceed // // Note: currently, find_or_load_shared_class is called only from // JVM_FindLoadedClass and used for PlatformClassLoader and AppClassLoader, // which are parallel-capable loaders, so this lock is NOT taken. Handle lockObject = compute_loader_lock_object(class_loader, THREAD); check_loader_lock_contention(lockObject, THREAD); ObjectLocker ol(lockObject, THREAD, DoObjectLock); { MutexLocker mu(SystemDictionary_lock, THREAD); InstanceKlass* check = find_class(d_hash, name, dictionary); if (check != NULL) { return check; } } k = load_shared_class_for_builtin_loader(name, class_loader, THREAD); if (k != NULL) { define_instance_class(k, CHECK_NULL); } } } return k; } InstanceKlass* SystemDictionaryShared::load_shared_class_for_builtin_loader( Symbol* class_name, Handle class_loader, TRAPS) { assert(UseSharedSpaces, "must be"); InstanceKlass* ik = find_builtin_class(class_name); if (ik != NULL) { if ((ik->is_shared_app_class() && SystemDictionary::is_system_class_loader(class_loader())) || (ik->is_shared_platform_class() && SystemDictionary::is_platform_class_loader(class_loader()))) { Handle protection_domain = SystemDictionaryShared::init_security_info(class_loader, ik, CHECK_NULL); return load_shared_class(ik, class_loader, protection_domain, NULL, THREAD); } } return NULL; } void SystemDictionaryShared::oops_do(OopClosure* f) { f->do_oop((oop*)&_shared_protection_domains); f->do_oop((oop*)&_shared_jar_urls); f->do_oop((oop*)&_shared_jar_manifests); } void SystemDictionaryShared::allocate_shared_protection_domain_array(int size, TRAPS) { if (_shared_protection_domains == NULL) { _shared_protection_domains = oopFactory::new_objArray( SystemDictionary::ProtectionDomain_klass(), size, CHECK); } } void SystemDictionaryShared::allocate_shared_jar_url_array(int size, TRAPS) { if (_shared_jar_urls == NULL) { _shared_jar_urls = oopFactory::new_objArray( SystemDictionary::URL_klass(), size, CHECK); } } void SystemDictionaryShared::allocate_shared_jar_manifest_array(int size, TRAPS) { if (_shared_jar_manifests == NULL) { _shared_jar_manifests = oopFactory::new_objArray( SystemDictionary::Jar_Manifest_klass(), size, CHECK); } } void SystemDictionaryShared::allocate_shared_data_arrays(int size, TRAPS) { allocate_shared_protection_domain_array(size, CHECK); allocate_shared_jar_url_array(size, CHECK); allocate_shared_jar_manifest_array(size, CHECK); } // This function is called for loading only UNREGISTERED classes InstanceKlass* SystemDictionaryShared::lookup_from_stream(Symbol* class_name, Handle class_loader, Handle protection_domain, const ClassFileStream* cfs, TRAPS) { if (!UseSharedSpaces) { return NULL; } if (class_name == NULL) { // don't do this for anonymous classes return NULL; } if (class_loader.is_null() || SystemDictionary::is_system_class_loader(class_loader()) || SystemDictionary::is_platform_class_loader(class_loader())) { // Do nothing for the BUILTIN loaders. return NULL; } const RunTimeSharedClassInfo* record = find_record(&_unregistered_dictionary, class_name); if (record == NULL) { if (DynamicArchive::is_mapped()) { record = find_record(&_dynamic_unregistered_dictionary, class_name); } if (record == NULL) { return NULL; } } int clsfile_size = cfs->length(); int clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length()); if (!record->matches(clsfile_size, clsfile_crc32)) { return NULL; } return acquire_class_for_current_thread(record->_klass, class_loader, protection_domain, cfs, THREAD); } InstanceKlass* SystemDictionaryShared::acquire_class_for_current_thread( InstanceKlass *ik, Handle class_loader, Handle protection_domain, const ClassFileStream *cfs, TRAPS) { ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader()); { MutexLocker mu(SharedDictionary_lock, THREAD); if (ik->class_loader_data() != NULL) { // ik is already loaded (by this loader or by a different loader) // or ik is being loaded by a different thread (by this loader or by a different loader) return NULL; } // No other thread has acquired this yet, so give it to *this thread* ik->set_class_loader_data(loader_data); } // No longer holding SharedDictionary_lock // No need to lock, as can be held only by a single thread. loader_data->add_class(ik); // Load and check super/interfaces, restore unsharable info InstanceKlass* shared_klass = load_shared_class(ik, class_loader, protection_domain, cfs, THREAD); if (shared_klass == NULL || HAS_PENDING_EXCEPTION) { // TODO: clean up so it can be used again return NULL; } return shared_klass; } static ResourceHashtable< Symbol*, bool, primitive_hash, primitive_equals, 6661, // prime number ResourceObj::C_HEAP> _loaded_unregistered_classes; bool SystemDictionaryShared::add_unregistered_class(InstanceKlass* k, TRAPS) { assert(DumpSharedSpaces, "only when dumping"); Symbol* name = k->name(); if (_loaded_unregistered_classes.get(name) != NULL) { // We don't allow duplicated unregistered classes of the same name. return false; } else { bool isnew = _loaded_unregistered_classes.put(name, true); assert(isnew, "sanity"); MutexLocker mu_r(Compile_lock, THREAD); // add_to_hierarchy asserts this. SystemDictionary::add_to_hierarchy(k, CHECK_0); return true; } } // This function is called to resolve the super/interfaces of shared classes for // non-built-in loaders. E.g., ChildClass in the below example // where "super:" (and optionally "interface:") have been specified. // // java/lang/Object id: 0 // Interface id: 2 super: 0 source: cust.jar // ChildClass id: 4 super: 0 interfaces: 2 source: cust.jar InstanceKlass* SystemDictionaryShared::dump_time_resolve_super_or_fail( Symbol* child_name, Symbol* class_name, Handle class_loader, Handle protection_domain, bool is_superclass, TRAPS) { assert(DumpSharedSpaces, "only when dumping"); ClassListParser* parser = ClassListParser::instance(); if (parser == NULL) { // We're still loading the well-known classes, before the ClassListParser is created. return NULL; } if (child_name->equals(parser->current_class_name())) { // When this function is called, all the numbered super and interface types // must have already been loaded. Hence this function is never recursively called. if (is_superclass) { return parser->lookup_super_for_current_class(class_name); } else { return parser->lookup_interface_for_current_class(class_name); } } else { // The VM is not trying to resolve a super type of parser->current_class_name(). // Instead, it's resolving an error class (because parser->current_class_name() has // failed parsing or verification). Don't do anything here. return NULL; } } DumpTimeSharedClassInfo* SystemDictionaryShared::find_or_allocate_info_for(InstanceKlass* k) { MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag); if (_dumptime_table == NULL) { _dumptime_table = new (ResourceObj::C_HEAP, mtClass)DumpTimeSharedClassTable(); } return _dumptime_table->find_or_allocate_info_for(k); } void SystemDictionaryShared::set_shared_class_misc_info(InstanceKlass* k, ClassFileStream* cfs) { Arguments::assert_is_dumping_archive(); assert(!is_builtin(k), "must be unregistered class"); DumpTimeSharedClassInfo* info = find_or_allocate_info_for(k); info->_clsfile_size = cfs->length(); info->_clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length()); } void SystemDictionaryShared::init_dumptime_info(InstanceKlass* k) { (void)find_or_allocate_info_for(k); } void SystemDictionaryShared::remove_dumptime_info(InstanceKlass* k) { MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag); DumpTimeSharedClassInfo* p = _dumptime_table->get(k); if (p == NULL) { return; } if (p->_verifier_constraints != NULL) { for (int i = 0; i < p->_verifier_constraints->length(); i++) { DumpTimeSharedClassInfo::DTConstraint constraint = p->_verifier_constraints->at(i); if (constraint._name != NULL ) { constraint._name->decrement_refcount(); } if (constraint._from_name != NULL ) { constraint._from_name->decrement_refcount(); } } FREE_C_HEAP_ARRAY(DTConstraint, p->_verifier_constraints); p->_verifier_constraints = NULL; } FREE_C_HEAP_ARRAY(char, p->_verifier_constraint_flags); p->_verifier_constraint_flags = NULL; _dumptime_table->remove(k); } bool SystemDictionaryShared::is_jfr_event_class(InstanceKlass *k) { while (k) { if (k->name()->equals("jdk/internal/event/Event")) { return true; } k = k->java_super(); } return false; } void SystemDictionaryShared::warn_excluded(InstanceKlass* k, const char* reason) { ResourceMark rm; log_warning(cds)("Skipping %s: %s", k->name()->as_C_string(), reason); } bool SystemDictionaryShared::should_be_excluded(InstanceKlass* k) { if (k->class_loader_data()->is_unsafe_anonymous()) { warn_excluded(k, "Unsafe anonymous class"); return true; // unsafe anonymous classes are not archived, skip } if (k->is_in_error_state()) { warn_excluded(k, "In error state"); return true; } if (k->shared_classpath_index() < 0 && is_builtin(k)) { // These are classes loaded from unsupported locations (such as those loaded by JVMTI native // agent during dump time). warn_excluded(k, "Unsupported location"); return true; } if (k->signers() != NULL) { // We cannot include signed classes in the archive because the certificates // used during dump time may be different than those used during // runtime (due to expiration, etc). warn_excluded(k, "Signed JAR"); return true; } if (is_jfr_event_class(k)) { // We cannot include JFR event classes because they need runtime-specific // instrumentation in order to work with -XX:FlightRecorderOptions=retransform=false. // There are only a small number of these classes, so it's not worthwhile to // support them and make CDS more complicated. warn_excluded(k, "JFR event class"); return true; } if (k->init_state() < InstanceKlass::linked) { // In static dumping, we will attempt to link all classes. Those that fail to link will // be marked as in error state. assert(DynamicDumpSharedSpaces, "must be"); // TODO -- rethink how this can be handled. // We should try to link ik, however, we can't do it here because // 1. We are at VM exit // 2. linking a class may cause other classes to be loaded, which means // a custom ClassLoader.loadClass() may be called, at a point where the // class loader doesn't expect it. warn_excluded(k, "Not linked"); return true; } if (k->major_version() < 50 /*JAVA_6_VERSION*/) { ResourceMark rm; log_warning(cds)("Pre JDK 6 class not supported by CDS: %u.%u %s", k->major_version(), k->minor_version(), k->name()->as_C_string()); return true; } InstanceKlass* super = k->java_super(); if (super != NULL && should_be_excluded(super)) { ResourceMark rm; log_warning(cds)("Skipping %s: super class %s is excluded", k->name()->as_C_string(), super->name()->as_C_string()); return true; } Array* interfaces = k->local_interfaces(); int len = interfaces->length(); for (int i = 0; i < len; i++) { InstanceKlass* intf = interfaces->at(i); if (should_be_excluded(intf)) { log_warning(cds)("Skipping %s: interface %s is excluded", k->name()->as_C_string(), intf->name()->as_C_string()); return true; } } return false; } // k is a class before relocating by ArchiveCompactor void SystemDictionaryShared::validate_before_archiving(InstanceKlass* k) { ResourceMark rm; const char* name = k->name()->as_C_string(); DumpTimeSharedClassInfo* info = _dumptime_table->get(k); assert(_no_class_loading_should_happen, "class loading must be disabled"); guarantee(info != NULL, "Class %s must be entered into _dumptime_table", name); guarantee(!info->is_excluded(), "Should not attempt to archive excluded class %s", name); if (is_builtin(k)) { guarantee(k->loader_type() != 0, "Class loader type must be set for BUILTIN class %s", name); } else { guarantee(k->loader_type() == 0, "Class loader type must not be set for UNREGISTERED class %s", name); } } class ExcludeDumpTimeSharedClasses : StackObj { public: bool do_entry(InstanceKlass* k, DumpTimeSharedClassInfo& info) { if (SystemDictionaryShared::should_be_excluded(k)) { info.set_excluded(); } return true; // keep on iterating } }; void SystemDictionaryShared::check_excluded_classes() { ExcludeDumpTimeSharedClasses excl; _dumptime_table->iterate(&excl); _dumptime_table->update_counts(); } bool SystemDictionaryShared::is_excluded_class(InstanceKlass* k) { assert(_no_class_loading_should_happen, "sanity"); Arguments::assert_is_dumping_archive(); return find_or_allocate_info_for(k)->is_excluded(); } class IterateDumpTimeSharedClassTable : StackObj { MetaspaceClosure *_it; public: IterateDumpTimeSharedClassTable(MetaspaceClosure* it) : _it(it) {} bool do_entry(InstanceKlass* k, DumpTimeSharedClassInfo& info) { if (!info.is_excluded()) { info.metaspace_pointers_do(_it); } return true; // keep on iterating } }; void SystemDictionaryShared::dumptime_classes_do(class MetaspaceClosure* it) { IterateDumpTimeSharedClassTable iter(it); _dumptime_table->iterate(&iter); } bool SystemDictionaryShared::add_verification_constraint(InstanceKlass* k, Symbol* name, Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object) { Arguments::assert_is_dumping_archive(); DumpTimeSharedClassInfo* info = find_or_allocate_info_for(k); info->add_verification_constraint(k, name, from_name, from_field_is_protected, from_is_array, from_is_object); if (DynamicDumpSharedSpaces) { // For dynamic dumping, we can resolve all the constraint classes for all class loaders during // the initial run prior to creating the archive before vm exit. We will also perform verification // check when running with the archive. return false; } else { if (is_builtin(k)) { // For builtin class loaders, we can try to complete the verification check at dump time, // because we can resolve all the constraint classes. We will also perform verification check // when running with the archive. return false; } else { // For non-builtin class loaders, we cannot complete the verification check at dump time, // because at dump time we don't know how to resolve classes for such loaders. return true; } } } void DumpTimeSharedClassInfo::add_verification_constraint(InstanceKlass* k, Symbol* name, Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object) { if (_verifier_constraints == NULL) { _verifier_constraints = new(ResourceObj::C_HEAP, mtClass) GrowableArray(4, true, mtClass); } if (_verifier_constraint_flags == NULL) { _verifier_constraint_flags = new(ResourceObj::C_HEAP, mtClass) GrowableArray(4, true, mtClass); } GrowableArray* vc_array = _verifier_constraints; for (int i = 0; i < vc_array->length(); i++) { DTConstraint* p = vc_array->adr_at(i); if (name == p->_name && from_name == p->_from_name) { return; } } DTConstraint cons(name, from_name); vc_array->append(cons); GrowableArray* vcflags_array = _verifier_constraint_flags; char c = 0; c |= from_field_is_protected ? SystemDictionaryShared::FROM_FIELD_IS_PROTECTED : 0; c |= from_is_array ? SystemDictionaryShared::FROM_IS_ARRAY : 0; c |= from_is_object ? SystemDictionaryShared::FROM_IS_OBJECT : 0; vcflags_array->append(c); if (log_is_enabled(Trace, cds, verification)) { ResourceMark rm; log_trace(cds, verification)("add_verification_constraint: %s: %s must be subclass of %s [0x%x]", k->external_name(), from_name->as_klass_external_name(), name->as_klass_external_name(), c); } } void SystemDictionaryShared::check_verification_constraints(InstanceKlass* klass, TRAPS) { assert(!DumpSharedSpaces && UseSharedSpaces, "called at run time with CDS enabled only"); RunTimeSharedClassInfo* record = RunTimeSharedClassInfo::get_for(klass); int length = record->_num_constraints; if (length > 0) { for (int i = 0; i < length; i++) { Symbol* name = record->get_constraint_name(i); Symbol* from_name = record->get_constraint_from_name(i); char c = record->get_constraint_flag(i); if (log_is_enabled(Trace, cds, verification)) { ResourceMark rm(THREAD); log_trace(cds, verification)("check_verification_constraint: %s: %s must be subclass of %s [0x%x]", klass->external_name(), from_name->as_klass_external_name(), name->as_klass_external_name(), c); } bool from_field_is_protected = (c & SystemDictionaryShared::FROM_FIELD_IS_PROTECTED) ? true : false; bool from_is_array = (c & SystemDictionaryShared::FROM_IS_ARRAY) ? true : false; bool from_is_object = (c & SystemDictionaryShared::FROM_IS_OBJECT) ? true : false; bool ok = VerificationType::resolve_and_check_assignability(klass, name, from_name, from_field_is_protected, from_is_array, from_is_object, CHECK); if (!ok) { ResourceMark rm(THREAD); stringStream ss; ss.print_cr("Bad type on operand stack"); ss.print_cr("Exception Details:"); ss.print_cr(" Location:\n %s", klass->name()->as_C_string()); ss.print_cr(" Reason:\n Type '%s' is not assignable to '%s'", from_name->as_quoted_ascii(), name->as_quoted_ascii()); THROW_MSG(vmSymbols::java_lang_VerifyError(), ss.as_string()); } } } } class EstimateSizeForArchive : StackObj { size_t _shared_class_info_size; int _num_builtin_klasses; int _num_unregistered_klasses; public: EstimateSizeForArchive() { _shared_class_info_size = 0; _num_builtin_klasses = 0; _num_unregistered_klasses = 0; } bool do_entry(InstanceKlass* k, DumpTimeSharedClassInfo& info) { if (!info.is_excluded()) { size_t byte_size = RunTimeSharedClassInfo::byte_size(info._klass, info.num_constraints()); _shared_class_info_size += align_up(byte_size, BytesPerWord); } return true; // keep on iterating } size_t total() { return _shared_class_info_size; } }; size_t SystemDictionaryShared::estimate_size_for_archive() { EstimateSizeForArchive est; _dumptime_table->iterate(&est); return est.total() + CompactHashtableWriter::estimate_size(_dumptime_table->count_of(true)) + CompactHashtableWriter::estimate_size(_dumptime_table->count_of(false)); } class CopySharedClassInfoToArchive : StackObj { CompactHashtableWriter* _writer; bool _is_builtin; public: CopySharedClassInfoToArchive(CompactHashtableWriter* writer, bool is_builtin, bool is_static_archive) : _writer(writer), _is_builtin(is_builtin) {} bool do_entry(InstanceKlass* k, DumpTimeSharedClassInfo& info) { if (!info.is_excluded() && info.is_builtin() == _is_builtin) { size_t byte_size = RunTimeSharedClassInfo::byte_size(info._klass, info.num_constraints()); RunTimeSharedClassInfo* record; record = (RunTimeSharedClassInfo*)MetaspaceShared::read_only_space_alloc(byte_size); record->init(info); unsigned int hash; Symbol* name = info._klass->name(); if (DynamicDumpSharedSpaces) { name = DynamicArchive::original_to_target(name); } hash = primitive_hash(name); u4 delta; if (DynamicDumpSharedSpaces) { delta = MetaspaceShared::object_delta_u4(DynamicArchive::buffer_to_target(record)); } else { delta = MetaspaceShared::object_delta_u4(record); } _writer->add(hash, delta); if (log_is_enabled(Trace, cds, hashtables)) { ResourceMark rm; log_trace(cds,hashtables)("%s dictionary: %s", (_is_builtin ? "builtin" : "unregistered"), info._klass->external_name()); } // Save this for quick runtime lookup of InstanceKlass* -> RunTimeSharedClassInfo* RunTimeSharedClassInfo::set_for(info._klass, record); } return true; // keep on iterating } }; void SystemDictionaryShared::write_dictionary(RunTimeSharedDictionary* dictionary, bool is_builtin, bool is_static_archive) { CompactHashtableStats stats; dictionary->reset(); CompactHashtableWriter writer(_dumptime_table->count_of(is_builtin), &stats); CopySharedClassInfoToArchive copy(&writer, is_builtin, is_static_archive); _dumptime_table->iterate(©); writer.dump(dictionary, is_builtin ? "builtin dictionary" : "unregistered dictionary"); } void SystemDictionaryShared::write_to_archive(bool is_static_archive) { if (is_static_archive) { write_dictionary(&_builtin_dictionary, true); write_dictionary(&_unregistered_dictionary, false); } else { write_dictionary(&_dynamic_builtin_dictionary, true); write_dictionary(&_dynamic_unregistered_dictionary, false); } } void SystemDictionaryShared::serialize_dictionary_headers(SerializeClosure* soc, bool is_static_archive) { if (is_static_archive) { _builtin_dictionary.serialize_header(soc); _unregistered_dictionary.serialize_header(soc); } else { _dynamic_builtin_dictionary.serialize_header(soc); _dynamic_unregistered_dictionary.serialize_header(soc); } } const RunTimeSharedClassInfo* SystemDictionaryShared::find_record(RunTimeSharedDictionary* dict, Symbol* name) { if (UseSharedSpaces) { unsigned int hash = primitive_hash(name); return dict->lookup(name, hash, 0); } else { return NULL; } } InstanceKlass* SystemDictionaryShared::find_builtin_class(Symbol* name) { const RunTimeSharedClassInfo* record = find_record(&_builtin_dictionary, name); if (record) { return record->_klass; } if (DynamicArchive::is_mapped()) { record = find_record(&_dynamic_builtin_dictionary, name); if (record) { return record->_klass; } } return NULL; } void SystemDictionaryShared::update_shared_entry(InstanceKlass* k, int id) { assert(DumpSharedSpaces, "supported only when dumping"); DumpTimeSharedClassInfo* info = find_or_allocate_info_for(k); info->_id = id; } class SharedDictionaryPrinter : StackObj { outputStream* _st; int _index; public: SharedDictionaryPrinter(outputStream* st) : _st(st), _index(0) {} void do_value(const RunTimeSharedClassInfo* record) { ResourceMark rm; _st->print_cr("%4d: %s", (_index++), record->_klass->external_name()); } }; void SystemDictionaryShared::print_on(outputStream* st) { if (UseSharedSpaces) { st->print_cr("Shared Dictionary"); SharedDictionaryPrinter p(st); _builtin_dictionary.iterate(&p); _unregistered_dictionary.iterate(&p); if (DynamicArchive::is_mapped()) { _dynamic_builtin_dictionary.iterate(&p); _unregistered_dictionary.iterate(&p); } } } void SystemDictionaryShared::print_table_statistics(outputStream* st) { if (UseSharedSpaces) { _builtin_dictionary.print_table_statistics(st, "Builtin Shared Dictionary"); _unregistered_dictionary.print_table_statistics(st, "Unregistered Shared Dictionary"); if (DynamicArchive::is_mapped()) { _dynamic_builtin_dictionary.print_table_statistics(st, "Dynamic Builtin Shared Dictionary"); _dynamic_unregistered_dictionary.print_table_statistics(st, "Unregistered Shared Dictionary"); } } } bool SystemDictionaryShared::empty_dumptime_table() { if (_dumptime_table == NULL) { return true; } _dumptime_table->update_counts(); if (_dumptime_table->count_of(true) == 0 && _dumptime_table->count_of(false) == 0){ return true; } return false; }