--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/classfile/systemDictionaryShared.cpp Mon Nov 27 20:21:34 2017 -0800
@@ -0,0 +1,1086 @@
+/*
+ * Copyright (c) 2014, 2017, 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/classLoaderExt.hpp"
+#include "classfile/compactHashtable.inline.hpp"
+#include "classfile/dictionary.hpp"
+#include "classfile/javaClasses.hpp"
+#include "classfile/sharedClassUtil.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 "oops/instanceKlass.hpp"
+#include "oops/klass.inline.hpp"
+#include "oops/objArrayOop.inline.hpp"
+#include "oops/oop.inline.hpp"
+#include "runtime/java.hpp"
+#include "runtime/javaCalls.hpp"
+#include "runtime/mutexLocker.hpp"
+#include "utilities/hashtable.inline.hpp"
+#include "utilities/stringUtils.hpp"
+
+
+objArrayOop SystemDictionaryShared::_shared_protection_domains = NULL;
+objArrayOop SystemDictionaryShared::_shared_jar_urls = NULL;
+objArrayOop SystemDictionaryShared::_shared_jar_manifests = NULL;
+
+static Mutex* SharedDictionary_lock = NULL;
+
+void SystemDictionaryShared::initialize(TRAPS) {
+ if (_java_system_loader != NULL) {
+ SharedDictionary_lock = new Mutex(Mutex::leaf, "SharedDictionary_lock", true);
+
+ // These classes need to be initialized before calling get_shared_jar_manifest(), etc.
+ SystemDictionary::ByteArrayInputStream_klass()->initialize(CHECK);
+ SystemDictionary::File_klass()->initialize(CHECK);
+ SystemDictionary::Jar_Manifest_klass()->initialize(CHECK);
+ SystemDictionary::CodeSource_klass()->initialize(CHECK);
+ }
+}
+
+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 empty;
+ Handle manifest ;
+ if (shared_jar_manifest(shared_path_index) == NULL) {
+ SharedClassPathEntryExt* ent = (SharedClassPathEntryExt*)FileMapInfo::shared_classpath(shared_path_index);
+ long size = ent->manifest_size();
+ if (size <= 0) {
+ return empty; // No manifest - return NULL handle
+ }
+
+ // ByteArrayInputStream bais = new ByteArrayInputStream(buf);
+ InstanceKlass* bais_klass = SystemDictionary::ByteArrayInputStream_klass();
+ Handle bais = bais_klass->allocate_instance_handle(CHECK_(empty));
+ {
+ const char* src = ent->manifest();
+ assert(src != NULL, "No Manifest data");
+ typeArrayOop buf = oopFactory::new_byteArray(size, CHECK_(empty));
+ typeArrayHandle bufhandle(THREAD, buf);
+ char* dst = (char*)(buf->byte_at_addr(0));
+ memcpy(dst, src, (size_t)size);
+
+ JavaValue result(T_VOID);
+ JavaCalls::call_special(&result, bais, bais_klass,
+ vmSymbols::object_initializer_name(),
+ vmSymbols::byte_array_void_signature(),
+ bufhandle, CHECK_(empty));
+ }
+
+ // manifest = new Manifest(bais)
+ InstanceKlass* manifest_klass = SystemDictionary::Jar_Manifest_klass();
+ manifest = manifest_klass->allocate_instance_handle(CHECK_(empty));
+ {
+ JavaValue result(T_VOID);
+ JavaCalls::call_special(&result, manifest, manifest_klass,
+ vmSymbols::object_initializer_name(),
+ vmSymbols::input_stream_void_signature(),
+ bais, CHECK_(empty));
+ }
+ 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_classpath_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(class_loader == _java_system_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);
+ InstanceKlass* cs_klass = SystemDictionary::CodeSource_klass();
+ Handle cs = cs_klass->allocate_instance_handle(CHECK_NH);
+ JavaValue void_result(T_VOID);
+ JavaCalls::call_special(&void_result, cs, cs_klass,
+ vmSymbols::object_initializer_name(),
+ 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();
+ Handle protection_domain;
+ if (mod->shared_protection_domain() == NULL) {
+ Symbol* location = mod->location();
+ if (location != NULL) {
+ Handle url_string = java_lang_String::create_from_symbol(
+ location, CHECK_(protection_domain));
+ JavaValue result(T_OBJECT);
+ Klass* classLoaders_klass =
+ SystemDictionary::jdk_internal_loader_ClassLoaders_klass();
+ JavaCalls::call_static(&result, classLoaders_klass, vmSymbols::toFileURL_name(),
+ vmSymbols::toFileURL_signature(),
+ url_string, CHECK_(protection_domain));
+ Handle url = Handle(THREAD, (oop)result.get_jobject());
+
+ Handle pd = get_protection_domain_from_classloader(class_loader, url, THREAD);
+ mod->set_shared_protection_domain(loader_data, pd);
+ }
+ }
+
+ protection_domain = Handle(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");
+ SharedClassPathEntryExt* ent =
+ (SharedClassPathEntryExt*)FileMapInfo::shared_classpath(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::_classpath_entry_table in filemap.hpp for details).
+ //
+ // If a shared InstanceKlass k is loaded from the class path, let
+ //
+ // index = k->shared_classpath_index():
+ //
+ // FileMap::_classpath_entry_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;
+}
+
+// Currently AppCDS only archives classes from the run-time image, the
+// -Xbootclasspath/a path, and the class path. The following rules need to be
+// revised when AppCDS is changed to archive classes from other code sources
+// in the future, for example the module path (specified by -p).
+//
+// 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 "modules" jimage. ModuleEntry must be defined in the
+// classloader.
+// App Classloader:
+// - Module class from "modules" jimage. 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");
+
+ int path_index = ik->shared_classpath_index();
+ SharedClassPathEntry* ent =
+ (SharedClassPathEntry*)FileMapInfo::shared_classpath(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 "modules" jimage
+ }
+ }
+ } 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_paths_start_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 run-time image.
+ if (!ent->is_modules_image() && path_index >= ClassLoaderExt::app_paths_start_index()) {
+ return true;
+ }
+ }
+ } else if (mod_entry != NULL) {
+ // The package/module is defined in the AppClassLoader. Currently we only
+ // support archiving application module class from the run-time image.
+ // Packages from the -cp path are in the unnamed_module.
+ if ((ent->is_modules_image() && mod_entry->location()->starts_with("jrt:")) ||
+ (pkg_entry->in_unnamed_module() && path_index >= ClassLoaderExt::app_paths_start_index())) {
+ DEBUG_ONLY( \
+ ClassLoaderData* loader_data = class_loader_data(class_loader); \
+ if (pkg_entry->in_unnamed_module()) \
+ assert(mod_entry == loader_data->unnamed_module(), "the unnamed module is not defined in the classloader");)
+
+ return true;
+ }
+ }
+ }
+ } 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;
+}
+
+// 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] java.lang.ClassLoader.loadClass()
+// [5] jdk.internal.loader.ClassLoaders$AppClassLoader_klass.loadClass()
+//
+// Because AppCDS supports only the PlatformClassLoader and AppClassLoader, we make the following
+// assumptions (based on the JDK 8.0 source code):
+//
+// [a] these two loaders use the default implementation of
+// ClassLoader.loadClass(String name, boolean resolve), which
+// [b] calls findLoadedClass(name), immediately followed by parent.loadClass(),
+// immediately followed by findClass(name).
+// [c] If the requested class is a shared class of the current class loader, parent.loadClass()
+// always returns null, and
+// [d] if AppCDS is not enabled, the class would be loaded by findClass() by decoding it from a
+// JAR file and then parsed.
+//
+// Given these assumptions, we intercept the findLoadedClass() call to invoke
+// SystemDictionaryShared::find_or_load_shared_class() to load the shared class from
+// the archive. The reasons are:
+//
+// + Because AppCDS is a commercial feature, we want to hide the implementation. There
+// is currently no easy way to hide Java code, so we did it with native code.
+// + Start-up is improved because we avoid decoding the JAR file, and avoid delegating
+// to the parent (since we know the parent will not find this class).
+//
+// NOTE: there's a lot of assumption about the Java code. If any of that change, this
+// needs to be redesigned.
+//
+// An alternative is to modify the Java code of AppClassLoader.loadClass().
+//
+InstanceKlass* SystemDictionaryShared::find_or_load_shared_class(
+ Symbol* name, Handle class_loader, TRAPS) {
+ if (DumpSharedSpaces) {
+ return NULL;
+ }
+
+ InstanceKlass* k = NULL;
+ if (shared_dictionary() != NULL &&
+ UseAppCDS && (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, CHECK_NULL);
+ 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);
+ Klass* check = find_class(d_hash, name, dictionary);
+ if (check != NULL) {
+ return InstanceKlass::cast(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(UseAppCDS && shared_dictionary() != NULL, "already checked");
+ Klass* k = shared_dictionary()->find_class_for_builtin_loader(class_name);
+
+ if (k != NULL) {
+ InstanceKlass* ik = InstanceKlass::cast(k);
+ 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, 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);
+}
+
+
+InstanceKlass* SystemDictionaryShared::lookup_from_stream(const Symbol* class_name,
+ Handle class_loader,
+ Handle protection_domain,
+ const ClassFileStream* cfs,
+ TRAPS) {
+ if (!UseAppCDS || shared_dictionary() == NULL) {
+ 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())) {
+ // This function is called for loading only UNREGISTERED classes.
+ // Do nothing for the BUILTIN loaders.
+ return NULL;
+ }
+
+ ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader());
+ Klass* k;
+
+ { // UNREGISTERED loader
+ if (!shared_dictionary()->class_exists_for_unregistered_loader(class_name)) {
+ // No classes of this name for unregistered loaders.
+ return NULL;
+ }
+
+ int clsfile_size = cfs->length();
+ int clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length());
+
+ k = shared_dictionary()->find_class_for_unregistered_loader(class_name,
+ clsfile_size, clsfile_crc32);
+ }
+
+ if (k == NULL) { // not archived
+ return NULL;
+ }
+
+ return acquire_class_for_current_thread(InstanceKlass::cast(k), class_loader,
+ protection_domain, THREAD);
+}
+
+InstanceKlass* SystemDictionaryShared::acquire_class_for_current_thread(
+ InstanceKlass *ik,
+ Handle class_loader,
+ Handle protection_domain,
+ 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 <ik> 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, THREAD);
+ if (shared_klass == NULL || HAS_PENDING_EXCEPTION) {
+ // TODO: clean up <ik> so it can be used again
+ return NULL;
+ }
+
+ return shared_klass;
+}
+
+bool SystemDictionaryShared::add_non_builtin_klass(Symbol* name, ClassLoaderData* loader_data,
+ InstanceKlass* k,
+ TRAPS) {
+ assert(DumpSharedSpaces, "only when dumping");
+ assert(UseAppCDS && boot_loader_dictionary() != NULL, "must be");
+
+ if (boot_loader_dictionary()->add_non_builtin_klass(name, loader_data, k)) {
+ MutexLocker mu_r(Compile_lock, THREAD); // not really necessary, but add_to_hierarchy asserts this.
+ add_to_hierarchy(k, CHECK_0);
+ return true;
+ }
+ return false;
+}
+
+// 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
+Klass* 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;
+ }
+}
+
+struct SharedMiscInfo {
+ Klass* _klass;
+ int _clsfile_size;
+ int _clsfile_crc32;
+};
+
+static GrowableArray<SharedMiscInfo>* misc_info_array = NULL;
+
+void SystemDictionaryShared::set_shared_class_misc_info(Klass* k, ClassFileStream* cfs) {
+ assert(DumpSharedSpaces, "only when dumping");
+ int clsfile_size = cfs->length();
+ int clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length());
+
+ if (misc_info_array == NULL) {
+ misc_info_array = new (ResourceObj::C_HEAP, mtClass) GrowableArray<SharedMiscInfo>(20, /*c heap*/ true);
+ }
+
+ SharedMiscInfo misc_info;
+ DEBUG_ONLY({
+ for (int i=0; i<misc_info_array->length(); i++) {
+ misc_info = misc_info_array->at(i);
+ assert(misc_info._klass != k, "cannot call set_shared_class_misc_info twice for the same class");
+ }
+ });
+
+ misc_info._klass = k;
+ misc_info._clsfile_size = clsfile_size;
+ misc_info._clsfile_crc32 = clsfile_crc32;
+
+ misc_info_array->append(misc_info);
+}
+
+void SystemDictionaryShared::init_shared_dictionary_entry(Klass* k, DictionaryEntry* ent) {
+ SharedDictionaryEntry* entry = (SharedDictionaryEntry*)ent;
+ entry->_id = -1;
+ entry->_clsfile_size = -1;
+ entry->_clsfile_crc32 = -1;
+ entry->_verifier_constraints = NULL;
+ entry->_verifier_constraint_flags = NULL;
+
+ if (misc_info_array != NULL) {
+ for (int i=0; i<misc_info_array->length(); i++) {
+ SharedMiscInfo misc_info = misc_info_array->at(i);
+ if (misc_info._klass == k) {
+ entry->_clsfile_size = misc_info._clsfile_size;
+ entry->_clsfile_crc32 = misc_info._clsfile_crc32;
+ misc_info_array->remove_at(i);
+ return;
+ }
+ }
+ }
+}
+
+bool SystemDictionaryShared::add_verification_constraint(Klass* k, Symbol* name,
+ Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object) {
+ assert(DumpSharedSpaces, "called at dump time only");
+
+ // Skip anonymous classes, which are not archived as they are not in
+ // dictionary (see assert_no_anonymoys_classes_in_dictionaries() in
+ // VM_PopulateDumpSharedSpace::doit()).
+ if (k->class_loader_data()->is_anonymous()) {
+ return true; // anonymous classes are not archived, skip
+ }
+
+ SharedDictionaryEntry* entry = ((SharedDictionary*)(k->class_loader_data()->dictionary()))->find_entry_for(k);
+ ResourceMark rm;
+ // Lambda classes are not archived and will be regenerated at runtime.
+ if (entry == NULL && strstr(k->name()->as_C_string(), "Lambda$") != NULL) {
+ return true;
+ }
+ assert(entry != NULL, "class should be in dictionary before being verified");
+ entry->add_verification_constraint(name, from_name, from_field_is_protected,
+ from_is_array, from_is_object);
+ if (entry->is_builtin()) {
+ // For builtin class loaders, we can try to complete the verification check at dump time,
+ // because we can resolve all the constraint classes.
+ 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 SystemDictionaryShared::finalize_verification_constraints() {
+ boot_loader_dictionary()->finalize_verification_constraints();
+}
+
+void SystemDictionaryShared::check_verification_constraints(InstanceKlass* klass,
+ TRAPS) {
+ assert(!DumpSharedSpaces && UseSharedSpaces, "called at run time with CDS enabled only");
+ SharedDictionaryEntry* entry = shared_dictionary()->find_entry_for(klass);
+ assert(entry != NULL, "call this only for shared classes");
+ entry->check_verification_constraints(klass, THREAD);
+}
+
+SharedDictionaryEntry* SharedDictionary::find_entry_for(Klass* klass) {
+ Symbol* class_name = klass->name();
+ unsigned int hash = compute_hash(class_name);
+ int index = hash_to_index(hash);
+
+ for (SharedDictionaryEntry* entry = bucket(index);
+ entry != NULL;
+ entry = entry->next()) {
+ if (entry->hash() == hash && entry->literal() == klass) {
+ return entry;
+ }
+ }
+
+ return NULL;
+}
+
+void SharedDictionary::finalize_verification_constraints() {
+ int bytes = 0, count = 0;
+ for (int index = 0; index < table_size(); index++) {
+ for (SharedDictionaryEntry *probe = bucket(index);
+ probe != NULL;
+ probe = probe->next()) {
+ int n = probe->finalize_verification_constraints();
+ if (n > 0) {
+ bytes += n;
+ count ++;
+ }
+ }
+ }
+ if (log_is_enabled(Info, cds, verification)) {
+ double avg = 0;
+ if (count > 0) {
+ avg = double(bytes) / double(count);
+ }
+ log_info(cds, verification)("Recorded verification constraints for %d classes = %d bytes (avg = %.2f bytes) ", count, bytes, avg);
+ }
+}
+
+void SharedDictionaryEntry::add_verification_constraint(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<Symbol*>(8, true, mtClass);
+ }
+ if (_verifier_constraint_flags == NULL) {
+ _verifier_constraint_flags = new(ResourceObj::C_HEAP, mtClass) GrowableArray<char>(4, true, mtClass);
+ }
+ GrowableArray<Symbol*>* vc_array = (GrowableArray<Symbol*>*)_verifier_constraints;
+ for (int i=0; i<vc_array->length(); i+= 2) {
+ if (name == vc_array->at(i) &&
+ from_name == vc_array->at(i+1)) {
+ return;
+ }
+ }
+ vc_array->append(name);
+ vc_array->append(from_name);
+
+ GrowableArray<char>* vcflags_array = (GrowableArray<char>*)_verifier_constraint_flags;
+ char c = 0;
+ c |= from_field_is_protected ? FROM_FIELD_IS_PROTECTED : 0;
+ c |= from_is_array ? FROM_IS_ARRAY : 0;
+ c |= from_is_object ? 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",
+ instance_klass()->external_name(), from_name->as_klass_external_name(),
+ name->as_klass_external_name());
+ }
+}
+
+int SharedDictionaryEntry::finalize_verification_constraints() {
+ assert(DumpSharedSpaces, "called at dump time only");
+ Thread* THREAD = Thread::current();
+ ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
+ GrowableArray<Symbol*>* vc_array = (GrowableArray<Symbol*>*)_verifier_constraints;
+ GrowableArray<char>* vcflags_array = (GrowableArray<char>*)_verifier_constraint_flags;
+
+ if (vc_array != NULL) {
+ if (log_is_enabled(Trace, cds, verification)) {
+ ResourceMark rm;
+ log_trace(cds, verification)("finalize_verification_constraint: %s",
+ literal()->external_name());
+ }
+
+ // Copy the constraints from C_HEAP-alloced GrowableArrays to Metaspace-alloced
+ // Arrays
+ int size = 0;
+ {
+ // FIXME: change this to be done after relocation, so we can use symbol offset??
+ int length = vc_array->length();
+ Array<Symbol*>* out = MetadataFactory::new_array<Symbol*>(loader_data, length, 0, THREAD);
+ assert(out != NULL, "Dump time allocation failure would have aborted VM");
+ for (int i=0; i<length; i++) {
+ out->at_put(i, vc_array->at(i));
+ }
+ _verifier_constraints = out;
+ size += out->size() * BytesPerWord;
+ delete vc_array;
+ }
+ {
+ int length = vcflags_array->length();
+ Array<char>* out = MetadataFactory::new_array<char>(loader_data, length, 0, THREAD);
+ assert(out != NULL, "Dump time allocation failure would have aborted VM");
+ for (int i=0; i<length; i++) {
+ out->at_put(i, vcflags_array->at(i));
+ }
+ _verifier_constraint_flags = out;
+ size += out->size() * BytesPerWord;
+ delete vcflags_array;
+ }
+
+ return size;
+ }
+ return 0;
+}
+
+void SharedDictionaryEntry::check_verification_constraints(InstanceKlass* klass, TRAPS) {
+ Array<Symbol*>* vc_array = (Array<Symbol*>*)_verifier_constraints;
+ Array<char>* vcflags_array = (Array<char>*)_verifier_constraint_flags;
+
+ if (vc_array != NULL) {
+ int length = vc_array->length();
+ for (int i=0; i<length; i+=2) {
+ Symbol* name = vc_array->at(i);
+ Symbol* from_name = vc_array->at(i+1);
+ char c = vcflags_array->at(i/2);
+
+ bool from_field_is_protected = (c & FROM_FIELD_IS_PROTECTED) ? true : false;
+ bool from_is_array = (c & FROM_IS_ARRAY) ? true : false;
+ bool from_is_object = (c & 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());
+ }
+ }
+ }
+}
+
+void SharedDictionaryEntry::metaspace_pointers_do(MetaspaceClosure* it) {
+ it->push((Array<Symbol*>**)&_verifier_constraints);
+ it->push((Array<char>**)&_verifier_constraint_flags);
+}
+
+bool SharedDictionary::add_non_builtin_klass(const Symbol* class_name,
+ ClassLoaderData* loader_data,
+ InstanceKlass* klass) {
+
+ assert(DumpSharedSpaces, "supported only when dumping");
+ assert(klass != NULL, "adding NULL klass");
+ assert(klass->name() == class_name, "sanity check on name");
+ assert(klass->shared_classpath_index() < 0,
+ "the shared classpath index should not be set for shared class loaded by the custom loaders");
+
+ // Add an entry for a non-builtin class.
+ // For a shared class for custom class loaders, SystemDictionary::resolve_or_null will
+ // not find this class, because is_builtin() is false.
+ unsigned int hash = compute_hash(class_name);
+ int index = hash_to_index(hash);
+
+ for (SharedDictionaryEntry* entry = bucket(index);
+ entry != NULL;
+ entry = entry->next()) {
+ if (entry->hash() == hash) {
+ Klass* klass = (Klass*)entry->literal();
+ if (klass->name() == class_name && klass->class_loader_data() == loader_data) {
+ // There is already a class defined with the same name
+ return false;
+ }
+ }
+ }
+
+ assert(Dictionary::entry_size() >= sizeof(SharedDictionaryEntry), "must be big enough");
+ SharedDictionaryEntry* entry = (SharedDictionaryEntry*)new_entry(hash, klass);
+ add_entry(index, entry);
+
+ assert(entry->is_unregistered(), "sanity");
+ assert(!entry->is_builtin(), "sanity");
+ return true;
+}
+
+
+//-----------------
+// SharedDictionary
+//-----------------
+
+
+Klass* SharedDictionary::find_class_for_builtin_loader(const Symbol* name) const {
+ SharedDictionaryEntry* entry = get_entry_for_builtin_loader(name);
+ return entry != NULL ? entry->instance_klass() : (Klass*)NULL;
+}
+
+Klass* SharedDictionary::find_class_for_unregistered_loader(const Symbol* name,
+ int clsfile_size,
+ int clsfile_crc32) const {
+
+ const SharedDictionaryEntry* entry = get_entry_for_unregistered_loader(name,
+ clsfile_size,
+ clsfile_crc32);
+ return entry != NULL ? entry->instance_klass() : (Klass*)NULL;
+}
+
+void SharedDictionary::update_entry(Klass* klass, int id) {
+ assert(DumpSharedSpaces, "supported only when dumping");
+ Symbol* class_name = klass->name();
+ unsigned int hash = compute_hash(class_name);
+ int index = hash_to_index(hash);
+
+ for (SharedDictionaryEntry* entry = bucket(index);
+ entry != NULL;
+ entry = entry->next()) {
+ if (entry->hash() == hash && entry->literal() == klass) {
+ entry->_id = id;
+ return;
+ }
+ }
+
+ ShouldNotReachHere();
+}
+
+SharedDictionaryEntry* SharedDictionary::get_entry_for_builtin_loader(const Symbol* class_name) const {
+ assert(!DumpSharedSpaces, "supported only when at runtime");
+ unsigned int hash = compute_hash(class_name);
+ const int index = hash_to_index(hash);
+
+ for (SharedDictionaryEntry* entry = bucket(index);
+ entry != NULL;
+ entry = entry->next()) {
+ if (entry->hash() == hash && entry->equals(class_name)) {
+ if (entry->is_builtin()) {
+ return entry;
+ }
+ }
+ }
+ return NULL;
+}
+
+SharedDictionaryEntry* SharedDictionary::get_entry_for_unregistered_loader(const Symbol* class_name,
+ int clsfile_size,
+ int clsfile_crc32) const {
+ assert(!DumpSharedSpaces, "supported only when at runtime");
+ unsigned int hash = compute_hash(class_name);
+ int index = hash_to_index(hash);
+
+ for (SharedDictionaryEntry* entry = bucket(index);
+ entry != NULL;
+ entry = entry->next()) {
+ if (entry->hash() == hash && entry->equals(class_name)) {
+ if (entry->is_unregistered()) {
+ if (clsfile_size == -1) {
+ // We're called from class_exists_for_unregistered_loader. At run time, we want to
+ // compute the CRC of a ClassFileStream only if there is an UNREGISTERED class
+ // with the matching name.
+ return entry;
+ } else {
+ // We're called from find_class_for_unregistered_loader
+ if (entry->_clsfile_size && clsfile_crc32 == entry->_clsfile_crc32) {
+ return entry;
+ }
+ }
+
+ // There can be only 1 class with this name for unregistered loaders.
+ return NULL;
+ }
+ }
+ }
+ return NULL;
+}