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/*
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* Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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# include "incls/_precompiled.incl"
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# include "incls/_systemDictionary.cpp.incl"
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Dictionary* SystemDictionary::_dictionary = NULL;
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PlaceholderTable* SystemDictionary::_placeholders = NULL;
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Dictionary* SystemDictionary::_shared_dictionary = NULL;
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LoaderConstraintTable* SystemDictionary::_loader_constraints = NULL;
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ResolutionErrorTable* SystemDictionary::_resolution_errors = NULL;
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int SystemDictionary::_number_of_modifications = 0;
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oop SystemDictionary::_system_loader_lock_obj = NULL;
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klassOop SystemDictionary::_object_klass = NULL;
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klassOop SystemDictionary::_string_klass = NULL;
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klassOop SystemDictionary::_class_klass = NULL;
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klassOop SystemDictionary::_cloneable_klass = NULL;
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klassOop SystemDictionary::_classloader_klass = NULL;
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klassOop SystemDictionary::_serializable_klass = NULL;
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klassOop SystemDictionary::_system_klass = NULL;
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klassOop SystemDictionary::_throwable_klass = NULL;
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klassOop SystemDictionary::_error_klass = NULL;
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klassOop SystemDictionary::_threaddeath_klass = NULL;
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klassOop SystemDictionary::_exception_klass = NULL;
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klassOop SystemDictionary::_runtime_exception_klass = NULL;
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klassOop SystemDictionary::_classNotFoundException_klass = NULL;
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klassOop SystemDictionary::_noClassDefFoundError_klass = NULL;
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klassOop SystemDictionary::_linkageError_klass = NULL;
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klassOop SystemDictionary::_classCastException_klass = NULL;
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klassOop SystemDictionary::_arrayStoreException_klass = NULL;
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klassOop SystemDictionary::_virtualMachineError_klass = NULL;
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klassOop SystemDictionary::_outOfMemoryError_klass = NULL;
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klassOop SystemDictionary::_StackOverflowError_klass = NULL;
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klassOop SystemDictionary::_illegalMonitorStateException_klass = NULL;
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klassOop SystemDictionary::_protectionDomain_klass = NULL;
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klassOop SystemDictionary::_AccessControlContext_klass = NULL;
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klassOop SystemDictionary::_reference_klass = NULL;
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klassOop SystemDictionary::_soft_reference_klass = NULL;
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klassOop SystemDictionary::_weak_reference_klass = NULL;
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klassOop SystemDictionary::_final_reference_klass = NULL;
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klassOop SystemDictionary::_phantom_reference_klass = NULL;
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klassOop SystemDictionary::_finalizer_klass = NULL;
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klassOop SystemDictionary::_thread_klass = NULL;
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klassOop SystemDictionary::_threadGroup_klass = NULL;
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klassOop SystemDictionary::_properties_klass = NULL;
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klassOop SystemDictionary::_reflect_accessible_object_klass = NULL;
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klassOop SystemDictionary::_reflect_field_klass = NULL;
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klassOop SystemDictionary::_reflect_method_klass = NULL;
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klassOop SystemDictionary::_reflect_constructor_klass = NULL;
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klassOop SystemDictionary::_reflect_magic_klass = NULL;
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klassOop SystemDictionary::_reflect_method_accessor_klass = NULL;
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klassOop SystemDictionary::_reflect_constructor_accessor_klass = NULL;
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klassOop SystemDictionary::_reflect_delegating_classloader_klass = NULL;
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klassOop SystemDictionary::_reflect_constant_pool_klass = NULL;
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klassOop SystemDictionary::_reflect_unsafe_static_field_accessor_impl_klass = NULL;
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klassOop SystemDictionary::_vector_klass = NULL;
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klassOop SystemDictionary::_hashtable_klass = NULL;
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klassOop SystemDictionary::_stringBuffer_klass = NULL;
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klassOop SystemDictionary::_stackTraceElement_klass = NULL;
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klassOop SystemDictionary::_java_nio_Buffer_klass = NULL;
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klassOop SystemDictionary::_sun_misc_AtomicLongCSImpl_klass = NULL;
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klassOop SystemDictionary::_sun_jkernel_DownloadManager_klass = NULL;
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klassOop SystemDictionary::_boolean_klass = NULL;
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klassOop SystemDictionary::_char_klass = NULL;
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klassOop SystemDictionary::_float_klass = NULL;
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klassOop SystemDictionary::_double_klass = NULL;
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klassOop SystemDictionary::_byte_klass = NULL;
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klassOop SystemDictionary::_short_klass = NULL;
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klassOop SystemDictionary::_int_klass = NULL;
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klassOop SystemDictionary::_long_klass = NULL;
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klassOop SystemDictionary::_box_klasses[T_VOID+1] = { NULL /*, NULL...*/ };
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oop SystemDictionary::_java_system_loader = NULL;
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bool SystemDictionary::_has_loadClassInternal = false;
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bool SystemDictionary::_has_checkPackageAccess = false;
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// lazily initialized klass variables
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volatile klassOop SystemDictionary::_abstract_ownable_synchronizer_klass = NULL;
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// ----------------------------------------------------------------------------
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// Java-level SystemLoader
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oop SystemDictionary::java_system_loader() {
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return _java_system_loader;
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}
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void SystemDictionary::compute_java_system_loader(TRAPS) {
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KlassHandle system_klass(THREAD, _classloader_klass);
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JavaValue result(T_OBJECT);
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JavaCalls::call_static(&result,
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KlassHandle(THREAD, _classloader_klass),
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vmSymbolHandles::getSystemClassLoader_name(),
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vmSymbolHandles::void_classloader_signature(),
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CHECK);
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_java_system_loader = (oop)result.get_jobject();
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}
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// ----------------------------------------------------------------------------
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// debugging
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#ifdef ASSERT
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// return true if class_name contains no '.' (internal format is '/')
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bool SystemDictionary::is_internal_format(symbolHandle class_name) {
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if (class_name.not_null()) {
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ResourceMark rm;
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char* name = class_name->as_C_string();
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return strchr(name, '.') == NULL;
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} else {
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return true;
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}
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}
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#endif
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// ----------------------------------------------------------------------------
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// Resolving of classes
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// Forwards to resolve_or_null
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klassOop SystemDictionary::resolve_or_fail(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS) {
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klassOop klass = resolve_or_null(class_name, class_loader, protection_domain, THREAD);
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if (HAS_PENDING_EXCEPTION || klass == NULL) {
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KlassHandle k_h(THREAD, klass);
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// can return a null klass
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klass = handle_resolution_exception(class_name, class_loader, protection_domain, throw_error, k_h, THREAD);
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}
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return klass;
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}
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klassOop SystemDictionary::handle_resolution_exception(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS) {
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if (HAS_PENDING_EXCEPTION) {
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// If we have a pending exception we forward it to the caller, unless throw_error is true,
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// in which case we have to check whether the pending exception is a ClassNotFoundException,
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// and if so convert it to a NoClassDefFoundError
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// And chain the original ClassNotFoundException
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if (throw_error && PENDING_EXCEPTION->is_a(SystemDictionary::classNotFoundException_klass())) {
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ResourceMark rm(THREAD);
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assert(klass_h() == NULL, "Should not have result with exception pending");
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Handle e(THREAD, PENDING_EXCEPTION);
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CLEAR_PENDING_EXCEPTION;
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THROW_MSG_CAUSE_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string(), e);
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} else {
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return NULL;
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}
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}
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// Class not found, throw appropriate error or exception depending on value of throw_error
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if (klass_h() == NULL) {
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ResourceMark rm(THREAD);
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if (throw_error) {
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THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), class_name->as_C_string());
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} else {
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THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), class_name->as_C_string());
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}
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}
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return (klassOop)klass_h();
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}
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klassOop SystemDictionary::resolve_or_fail(symbolHandle class_name,
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bool throw_error, TRAPS)
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{
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return resolve_or_fail(class_name, Handle(), Handle(), throw_error, THREAD);
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}
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// Forwards to resolve_instance_class_or_null
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klassOop SystemDictionary::resolve_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS) {
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assert(!THREAD->is_Compiler_thread(), "Can not load classes with the Compiler thread");
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if (FieldType::is_array(class_name())) {
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return resolve_array_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL);
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} else {
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return resolve_instance_class_or_null(class_name, class_loader, protection_domain, CHECK_NULL);
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}
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}
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klassOop SystemDictionary::resolve_or_null(symbolHandle class_name, TRAPS) {
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return resolve_or_null(class_name, Handle(), Handle(), THREAD);
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}
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// Forwards to resolve_instance_class_or_null
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klassOop SystemDictionary::resolve_array_class_or_null(symbolHandle class_name,
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Handle class_loader,
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Handle protection_domain,
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TRAPS) {
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assert(FieldType::is_array(class_name()), "must be array");
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jint dimension;
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symbolOop object_key;
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klassOop k = NULL;
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// dimension and object_key are assigned as a side-effect of this call
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BasicType t = FieldType::get_array_info(class_name(),
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&dimension,
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&object_key,
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CHECK_NULL);
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if (t == T_OBJECT) {
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symbolHandle h_key(THREAD, object_key);
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// naked oop "k" is OK here -- we assign back into it
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k = SystemDictionary::resolve_instance_class_or_null(h_key,
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class_loader,
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protection_domain,
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CHECK_NULL);
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if (k != NULL) {
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k = Klass::cast(k)->array_klass(dimension, CHECK_NULL);
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}
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} else {
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k = Universe::typeArrayKlassObj(t);
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k = typeArrayKlass::cast(k)->array_klass(dimension, CHECK_NULL);
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}
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return k;
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}
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// Must be called for any super-class or super-interface resolution
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// during class definition to allow class circularity checking
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// super-interface callers:
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// parse_interfaces - for defineClass & jvmtiRedefineClasses
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// super-class callers:
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// ClassFileParser - for defineClass & jvmtiRedefineClasses
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// load_shared_class - while loading a class from shared archive
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// resolve_instance_class_or_fail:
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// when resolving a class that has an existing placeholder with
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// a saved superclass [i.e. a defineClass is currently in progress]
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// if another thread is trying to resolve the class, it must do
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// super-class checks on its own thread to catch class circularity
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// This last call is critical in class circularity checking for cases
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// where classloading is delegated to different threads and the
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// classloader lock is released.
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// Take the case: Base->Super->Base
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// 1. If thread T1 tries to do a defineClass of class Base
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// resolve_super_or_fail creates placeholder: T1, Base (super Super)
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// 2. resolve_instance_class_or_null does not find SD or placeholder for Super
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// so it tries to load Super
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// 3. If we load the class internally, or user classloader uses same thread
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// loadClassFromxxx or defineClass via parseClassFile Super ...
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// 3.1 resolve_super_or_fail creates placeholder: T1, Super (super Base)
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// 3.3 resolve_instance_class_or_null Base, finds placeholder for Base
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// 3.4 calls resolve_super_or_fail Base
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// 3.5 finds T1,Base -> throws class circularity
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//OR 4. If T2 tries to resolve Super via defineClass Super ...
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// 4.1 resolve_super_or_fail creates placeholder: T2, Super (super Base)
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// 4.2 resolve_instance_class_or_null Base, finds placeholder for Base (super Super)
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// 4.3 calls resolve_super_or_fail Super in parallel on own thread T2
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// 4.4 finds T2, Super -> throws class circularity
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// Must be called, even if superclass is null, since this is
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// where the placeholder entry is created which claims this
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// thread is loading this class/classloader.
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klassOop SystemDictionary::resolve_super_or_fail(symbolHandle child_name,
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symbolHandle class_name,
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Handle class_loader,
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Handle protection_domain,
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bool is_superclass,
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TRAPS) {
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// Double-check, if child class is already loaded, just return super-class,interface
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// Don't add a placedholder if already loaded, i.e. already in system dictionary
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// Make sure there's a placeholder for the *child* before resolving.
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// Used as a claim that this thread is currently loading superclass/classloader
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// Used here for ClassCircularity checks and also for heap verification
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// (every instanceKlass in the heap needs to be in the system dictionary
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// or have a placeholder).
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// Must check ClassCircularity before checking if super class is already loaded
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//
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// We might not already have a placeholder if this child_name was
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// first seen via resolve_from_stream (jni_DefineClass or JVM_DefineClass);
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// the name of the class might not be known until the stream is actually
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// parsed.
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// Bugs 4643874, 4715493
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// compute_hash can have a safepoint
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unsigned int d_hash = dictionary()->compute_hash(child_name, class_loader);
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int d_index = dictionary()->hash_to_index(d_hash);
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unsigned int p_hash = placeholders()->compute_hash(child_name, class_loader);
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int p_index = placeholders()->hash_to_index(p_hash);
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// can't throw error holding a lock
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bool child_already_loaded = false;
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bool throw_circularity_error = false;
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{
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MutexLocker mu(SystemDictionary_lock, THREAD);
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klassOop childk = find_class(d_index, d_hash, child_name, class_loader);
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klassOop quicksuperk;
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// to support // loading: if child done loading, just return superclass
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// if class_name, & class_loader don't match:
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// if initial define, SD update will give LinkageError
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// if redefine: compare_class_versions will give HIERARCHY_CHANGED
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// so we don't throw an exception here.
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// see: nsk redefclass014 & java.lang.instrument Instrument032
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if ((childk != NULL ) && (is_superclass) &&
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((quicksuperk = instanceKlass::cast(childk)->super()) != NULL) &&
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((Klass::cast(quicksuperk)->name() == class_name()) &&
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(Klass::cast(quicksuperk)->class_loader() == class_loader()))) {
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return quicksuperk;
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} else {
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PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, class_loader);
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if (probe && probe->check_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER)) {
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throw_circularity_error = true;
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}
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// add placeholder entry even if error - callers will remove on error
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PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, child_name, class_loader, PlaceholderTable::LOAD_SUPER, class_name, THREAD);
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if (throw_circularity_error) {
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newprobe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER);
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}
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}
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}
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if (throw_circularity_error) {
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ResourceMark rm(THREAD);
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THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), child_name->as_C_string());
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}
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// java.lang.Object should have been found above
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assert(class_name() != NULL, "null super class for resolving");
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// Resolve the super class or interface, check results on return
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klassOop superk = NULL;
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superk = SystemDictionary::resolve_or_null(class_name,
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class_loader,
|
|
358 |
protection_domain,
|
|
359 |
THREAD);
|
|
360 |
|
|
361 |
KlassHandle superk_h(THREAD, superk);
|
|
362 |
|
|
363 |
// Note: clean up of placeholders currently in callers of
|
|
364 |
// resolve_super_or_fail - either at update_dictionary time
|
|
365 |
// or on error
|
|
366 |
{
|
|
367 |
MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
368 |
PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, child_name, class_loader);
|
|
369 |
if (probe != NULL) {
|
|
370 |
probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_SUPER);
|
|
371 |
}
|
|
372 |
}
|
|
373 |
if (HAS_PENDING_EXCEPTION || superk_h() == NULL) {
|
|
374 |
// can null superk
|
|
375 |
superk_h = KlassHandle(THREAD, handle_resolution_exception(class_name, class_loader, protection_domain, true, superk_h, THREAD));
|
|
376 |
}
|
|
377 |
|
|
378 |
return superk_h();
|
|
379 |
}
|
|
380 |
|
|
381 |
|
|
382 |
void SystemDictionary::validate_protection_domain(instanceKlassHandle klass,
|
|
383 |
Handle class_loader,
|
|
384 |
Handle protection_domain,
|
|
385 |
TRAPS) {
|
|
386 |
if(!has_checkPackageAccess()) return;
|
|
387 |
|
|
388 |
// Now we have to call back to java to check if the initating class has access
|
|
389 |
JavaValue result(T_VOID);
|
|
390 |
if (TraceProtectionDomainVerification) {
|
|
391 |
// Print out trace information
|
|
392 |
tty->print_cr("Checking package access");
|
|
393 |
tty->print(" - class loader: "); class_loader()->print_value_on(tty); tty->cr();
|
|
394 |
tty->print(" - protection domain: "); protection_domain()->print_value_on(tty); tty->cr();
|
|
395 |
tty->print(" - loading: "); klass()->print_value_on(tty); tty->cr();
|
|
396 |
}
|
|
397 |
|
|
398 |
assert(class_loader() != NULL, "should not have non-null protection domain for null classloader");
|
|
399 |
|
|
400 |
KlassHandle system_loader(THREAD, SystemDictionary::classloader_klass());
|
|
401 |
JavaCalls::call_special(&result,
|
|
402 |
class_loader,
|
|
403 |
system_loader,
|
|
404 |
vmSymbolHandles::checkPackageAccess_name(),
|
|
405 |
vmSymbolHandles::class_protectiondomain_signature(),
|
|
406 |
Handle(THREAD, klass->java_mirror()),
|
|
407 |
protection_domain,
|
|
408 |
THREAD);
|
|
409 |
|
|
410 |
if (TraceProtectionDomainVerification) {
|
|
411 |
if (HAS_PENDING_EXCEPTION) {
|
|
412 |
tty->print_cr(" -> DENIED !!!!!!!!!!!!!!!!!!!!!");
|
|
413 |
} else {
|
|
414 |
tty->print_cr(" -> granted");
|
|
415 |
}
|
|
416 |
tty->cr();
|
|
417 |
}
|
|
418 |
|
|
419 |
if (HAS_PENDING_EXCEPTION) return;
|
|
420 |
|
|
421 |
// If no exception has been thrown, we have validated the protection domain
|
|
422 |
// Insert the protection domain of the initiating class into the set.
|
|
423 |
{
|
|
424 |
// We recalculate the entry here -- we've called out to java since
|
|
425 |
// the last time it was calculated.
|
|
426 |
symbolHandle kn(THREAD, klass->name());
|
|
427 |
unsigned int d_hash = dictionary()->compute_hash(kn, class_loader);
|
|
428 |
int d_index = dictionary()->hash_to_index(d_hash);
|
|
429 |
|
|
430 |
MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
431 |
{
|
|
432 |
// Note that we have an entry, and entries can be deleted only during GC,
|
|
433 |
// so we cannot allow GC to occur while we're holding this entry.
|
|
434 |
|
|
435 |
// We're using a No_Safepoint_Verifier to catch any place where we
|
|
436 |
// might potentially do a GC at all.
|
|
437 |
// SystemDictionary::do_unloading() asserts that classes are only
|
|
438 |
// unloaded at a safepoint.
|
|
439 |
No_Safepoint_Verifier nosafepoint;
|
|
440 |
dictionary()->add_protection_domain(d_index, d_hash, klass, class_loader,
|
|
441 |
protection_domain, THREAD);
|
|
442 |
}
|
|
443 |
}
|
|
444 |
}
|
|
445 |
|
|
446 |
// We only get here if this thread finds that another thread
|
|
447 |
// has already claimed the placeholder token for the current operation,
|
|
448 |
// but that other thread either never owned or gave up the
|
|
449 |
// object lock
|
|
450 |
// Waits on SystemDictionary_lock to indicate placeholder table updated
|
|
451 |
// On return, caller must recheck placeholder table state
|
|
452 |
//
|
|
453 |
// We only get here if
|
|
454 |
// 1) custom classLoader, i.e. not bootstrap classloader
|
|
455 |
// 2) UnsyncloadClass not set
|
|
456 |
// 3) custom classLoader has broken the class loader objectLock
|
|
457 |
// so another thread got here in parallel
|
|
458 |
//
|
|
459 |
// lockObject must be held.
|
|
460 |
// Complicated dance due to lock ordering:
|
|
461 |
// Must first release the classloader object lock to
|
|
462 |
// allow initial definer to complete the class definition
|
|
463 |
// and to avoid deadlock
|
|
464 |
// Reclaim classloader lock object with same original recursion count
|
|
465 |
// Must release SystemDictionary_lock after notify, since
|
|
466 |
// class loader lock must be claimed before SystemDictionary_lock
|
|
467 |
// to prevent deadlocks
|
|
468 |
//
|
|
469 |
// The notify allows applications that did an untimed wait() on
|
|
470 |
// the classloader object lock to not hang.
|
|
471 |
void SystemDictionary::double_lock_wait(Handle lockObject, TRAPS) {
|
|
472 |
assert_lock_strong(SystemDictionary_lock);
|
|
473 |
|
|
474 |
bool calledholdinglock
|
|
475 |
= ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, lockObject);
|
|
476 |
assert(calledholdinglock,"must hold lock for notify");
|
|
477 |
assert(!UnsyncloadClass, "unexpected double_lock_wait");
|
|
478 |
ObjectSynchronizer::notifyall(lockObject, THREAD);
|
|
479 |
intptr_t recursions = ObjectSynchronizer::complete_exit(lockObject, THREAD);
|
|
480 |
SystemDictionary_lock->wait();
|
|
481 |
SystemDictionary_lock->unlock();
|
|
482 |
ObjectSynchronizer::reenter(lockObject, recursions, THREAD);
|
|
483 |
SystemDictionary_lock->lock();
|
|
484 |
}
|
|
485 |
|
|
486 |
// If the class in is in the placeholder table, class loading is in progress
|
|
487 |
// For cases where the application changes threads to load classes, it
|
|
488 |
// is critical to ClassCircularity detection that we try loading
|
|
489 |
// the superclass on the same thread internally, so we do parallel
|
|
490 |
// super class loading here.
|
|
491 |
// This also is critical in cases where the original thread gets stalled
|
|
492 |
// even in non-circularity situations.
|
|
493 |
// Note: only one thread can define the class, but multiple can resolve
|
|
494 |
// Note: must call resolve_super_or_fail even if null super -
|
|
495 |
// to force placeholder entry creation for this class
|
|
496 |
// Caller must check for pending exception
|
|
497 |
// Returns non-null klassOop if other thread has completed load
|
|
498 |
// and we are done,
|
|
499 |
// If return null klassOop and no pending exception, the caller must load the class
|
|
500 |
instanceKlassHandle SystemDictionary::handle_parallel_super_load(
|
|
501 |
symbolHandle name, symbolHandle superclassname, Handle class_loader,
|
|
502 |
Handle protection_domain, Handle lockObject, TRAPS) {
|
|
503 |
|
|
504 |
instanceKlassHandle nh = instanceKlassHandle(); // null Handle
|
|
505 |
unsigned int d_hash = dictionary()->compute_hash(name, class_loader);
|
|
506 |
int d_index = dictionary()->hash_to_index(d_hash);
|
|
507 |
unsigned int p_hash = placeholders()->compute_hash(name, class_loader);
|
|
508 |
int p_index = placeholders()->hash_to_index(p_hash);
|
|
509 |
|
|
510 |
// superk is not used, resolve_super called for circularity check only
|
|
511 |
// This code is reached in two situations. One if this thread
|
|
512 |
// is loading the same class twice (e.g. ClassCircularity, or
|
|
513 |
// java.lang.instrument).
|
|
514 |
// The second is if another thread started the resolve_super first
|
|
515 |
// and has not yet finished.
|
|
516 |
// In both cases the original caller will clean up the placeholder
|
|
517 |
// entry on error.
|
|
518 |
klassOop superk = SystemDictionary::resolve_super_or_fail(name,
|
|
519 |
superclassname,
|
|
520 |
class_loader,
|
|
521 |
protection_domain,
|
|
522 |
true,
|
|
523 |
CHECK_(nh));
|
|
524 |
// We don't redefine the class, so we just need to clean up if there
|
|
525 |
// was not an error (don't want to modify any system dictionary
|
|
526 |
// data structures).
|
|
527 |
{
|
|
528 |
MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
529 |
placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD);
|
|
530 |
SystemDictionary_lock->notify_all();
|
|
531 |
}
|
|
532 |
|
|
533 |
// UnsyncloadClass does NOT wait for parallel superclass loads to complete
|
|
534 |
// Bootstrap classloader does wait for parallel superclass loads
|
|
535 |
if (UnsyncloadClass) {
|
|
536 |
MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
537 |
// Check if classloading completed while we were loading superclass or waiting
|
|
538 |
klassOop check = find_class(d_index, d_hash, name, class_loader);
|
|
539 |
if (check != NULL) {
|
|
540 |
// Klass is already loaded, so just return it
|
|
541 |
return(instanceKlassHandle(THREAD, check));
|
|
542 |
} else {
|
|
543 |
return nh;
|
|
544 |
}
|
|
545 |
}
|
|
546 |
|
|
547 |
// must loop to both handle other placeholder updates
|
|
548 |
// and spurious notifications
|
|
549 |
bool super_load_in_progress = true;
|
|
550 |
PlaceholderEntry* placeholder;
|
|
551 |
while (super_load_in_progress) {
|
|
552 |
MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
553 |
// Check if classloading completed while we were loading superclass or waiting
|
|
554 |
klassOop check = find_class(d_index, d_hash, name, class_loader);
|
|
555 |
if (check != NULL) {
|
|
556 |
// Klass is already loaded, so just return it
|
|
557 |
return(instanceKlassHandle(THREAD, check));
|
|
558 |
} else {
|
|
559 |
placeholder = placeholders()->get_entry(p_index, p_hash, name, class_loader);
|
|
560 |
if (placeholder && placeholder->super_load_in_progress() ){
|
|
561 |
// Before UnsyncloadClass:
|
|
562 |
// We only get here if the application has released the
|
|
563 |
// classloader lock when another thread was in the middle of loading a
|
|
564 |
// superclass/superinterface for this class, and now
|
|
565 |
// this thread is also trying to load this class.
|
|
566 |
// To minimize surprises, the first thread that started to
|
|
567 |
// load a class should be the one to complete the loading
|
|
568 |
// with the classfile it initially expected.
|
|
569 |
// This logic has the current thread wait once it has done
|
|
570 |
// all the superclass/superinterface loading it can, until
|
|
571 |
// the original thread completes the class loading or fails
|
|
572 |
// If it completes we will use the resulting instanceKlass
|
|
573 |
// which we will find below in the systemDictionary.
|
|
574 |
// We also get here for parallel bootstrap classloader
|
|
575 |
if (class_loader.is_null()) {
|
|
576 |
SystemDictionary_lock->wait();
|
|
577 |
} else {
|
|
578 |
double_lock_wait(lockObject, THREAD);
|
|
579 |
}
|
|
580 |
} else {
|
|
581 |
// If not in SD and not in PH, other thread's load must have failed
|
|
582 |
super_load_in_progress = false;
|
|
583 |
}
|
|
584 |
}
|
|
585 |
}
|
|
586 |
return (nh);
|
|
587 |
}
|
|
588 |
|
|
589 |
|
|
590 |
klassOop SystemDictionary::resolve_instance_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS) {
|
|
591 |
assert(class_name.not_null() && !FieldType::is_array(class_name()), "invalid class name");
|
|
592 |
// First check to see if we should remove wrapping L and ;
|
|
593 |
symbolHandle name;
|
|
594 |
if (FieldType::is_obj(class_name())) {
|
|
595 |
ResourceMark rm(THREAD);
|
|
596 |
// Ignore wrapping L and ;.
|
|
597 |
name = oopFactory::new_symbol_handle(class_name()->as_C_string() + 1, class_name()->utf8_length() - 2, CHECK_NULL);
|
|
598 |
} else {
|
|
599 |
name = class_name;
|
|
600 |
}
|
|
601 |
|
|
602 |
// UseNewReflection
|
|
603 |
// Fix for 4474172; see evaluation for more details
|
|
604 |
class_loader = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader()));
|
|
605 |
|
|
606 |
// Do lookup to see if class already exist and the protection domain
|
|
607 |
// has the right access
|
|
608 |
unsigned int d_hash = dictionary()->compute_hash(name, class_loader);
|
|
609 |
int d_index = dictionary()->hash_to_index(d_hash);
|
|
610 |
klassOop probe = dictionary()->find(d_index, d_hash, name, class_loader,
|
|
611 |
protection_domain, THREAD);
|
|
612 |
if (probe != NULL) return probe;
|
|
613 |
|
|
614 |
|
|
615 |
// Non-bootstrap class loaders will call out to class loader and
|
|
616 |
// define via jvm/jni_DefineClass which will acquire the
|
|
617 |
// class loader object lock to protect against multiple threads
|
|
618 |
// defining the class in parallel by accident.
|
|
619 |
// This lock must be acquired here so the waiter will find
|
|
620 |
// any successful result in the SystemDictionary and not attempt
|
|
621 |
// the define
|
|
622 |
// Classloaders that support parallelism, e.g. bootstrap classloader,
|
|
623 |
// or all classloaders with UnsyncloadClass do not acquire lock here
|
|
624 |
bool DoObjectLock = true;
|
|
625 |
if (UnsyncloadClass || (class_loader.is_null())) {
|
|
626 |
DoObjectLock = false;
|
|
627 |
}
|
|
628 |
|
|
629 |
unsigned int p_hash = placeholders()->compute_hash(name, class_loader);
|
|
630 |
int p_index = placeholders()->hash_to_index(p_hash);
|
|
631 |
|
|
632 |
// Class is not in SystemDictionary so we have to do loading.
|
|
633 |
// Make sure we are synchronized on the class loader before we proceed
|
|
634 |
Handle lockObject = compute_loader_lock_object(class_loader, THREAD);
|
|
635 |
check_loader_lock_contention(lockObject, THREAD);
|
|
636 |
ObjectLocker ol(lockObject, THREAD, DoObjectLock);
|
|
637 |
|
|
638 |
// Check again (after locking) if class already exist in SystemDictionary
|
|
639 |
bool class_has_been_loaded = false;
|
|
640 |
bool super_load_in_progress = false;
|
|
641 |
bool havesupername = false;
|
|
642 |
instanceKlassHandle k;
|
|
643 |
PlaceholderEntry* placeholder;
|
|
644 |
symbolHandle superclassname;
|
|
645 |
|
|
646 |
{
|
|
647 |
MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
648 |
klassOop check = find_class(d_index, d_hash, name, class_loader);
|
|
649 |
if (check != NULL) {
|
|
650 |
// Klass is already loaded, so just return it
|
|
651 |
class_has_been_loaded = true;
|
|
652 |
k = instanceKlassHandle(THREAD, check);
|
|
653 |
} else {
|
|
654 |
placeholder = placeholders()->get_entry(p_index, p_hash, name, class_loader);
|
|
655 |
if (placeholder && placeholder->super_load_in_progress()) {
|
|
656 |
super_load_in_progress = true;
|
|
657 |
if (placeholder->havesupername() == true) {
|
|
658 |
superclassname = symbolHandle(THREAD, placeholder->supername());
|
|
659 |
havesupername = true;
|
|
660 |
}
|
|
661 |
}
|
|
662 |
}
|
|
663 |
}
|
|
664 |
|
|
665 |
// If the class in is in the placeholder table, class loading is in progress
|
|
666 |
if (super_load_in_progress && havesupername==true) {
|
|
667 |
k = SystemDictionary::handle_parallel_super_load(name, superclassname,
|
|
668 |
class_loader, protection_domain, lockObject, THREAD);
|
|
669 |
if (HAS_PENDING_EXCEPTION) {
|
|
670 |
return NULL;
|
|
671 |
}
|
|
672 |
if (!k.is_null()) {
|
|
673 |
class_has_been_loaded = true;
|
|
674 |
}
|
|
675 |
}
|
|
676 |
|
|
677 |
if (!class_has_been_loaded) {
|
|
678 |
|
|
679 |
// add placeholder entry to record loading instance class
|
|
680 |
// Five cases:
|
|
681 |
// All cases need to prevent modifying bootclasssearchpath
|
|
682 |
// in parallel with a classload of same classname
|
|
683 |
// case 1. traditional classloaders that rely on the classloader object lock
|
|
684 |
// - no other need for LOAD_INSTANCE
|
|
685 |
// case 2. traditional classloaders that break the classloader object lock
|
|
686 |
// as a deadlock workaround. Detection of this case requires that
|
|
687 |
// this check is done while holding the classloader object lock,
|
|
688 |
// and that lock is still held when calling classloader's loadClass.
|
|
689 |
// For these classloaders, we ensure that the first requestor
|
|
690 |
// completes the load and other requestors wait for completion.
|
|
691 |
// case 3. UnsyncloadClass - don't use objectLocker
|
|
692 |
// With this flag, we allow parallel classloading of a
|
|
693 |
// class/classloader pair
|
|
694 |
// case4. Bootstrap classloader - don't own objectLocker
|
|
695 |
// This classloader supports parallelism at the classloader level,
|
|
696 |
// but only allows a single load of a class/classloader pair.
|
|
697 |
// No performance benefit and no deadlock issues.
|
|
698 |
// case 5. Future: parallel user level classloaders - without objectLocker
|
|
699 |
symbolHandle nullsymbolHandle;
|
|
700 |
bool throw_circularity_error = false;
|
|
701 |
{
|
|
702 |
MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
703 |
if (!UnsyncloadClass) {
|
|
704 |
PlaceholderEntry* oldprobe = placeholders()->get_entry(p_index, p_hash, name, class_loader);
|
|
705 |
if (oldprobe) {
|
|
706 |
// only need check_seen_thread once, not on each loop
|
|
707 |
// 6341374 java/lang/Instrument with -Xcomp
|
|
708 |
if (oldprobe->check_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE)) {
|
|
709 |
throw_circularity_error = true;
|
|
710 |
} else {
|
|
711 |
// case 1: traditional: should never see load_in_progress.
|
|
712 |
while (!class_has_been_loaded && oldprobe && oldprobe->instance_load_in_progress()) {
|
|
713 |
|
|
714 |
// case 4: bootstrap classloader: prevent futile classloading,
|
|
715 |
// wait on first requestor
|
|
716 |
if (class_loader.is_null()) {
|
|
717 |
SystemDictionary_lock->wait();
|
|
718 |
} else {
|
|
719 |
// case 2: traditional with broken classloader lock. wait on first
|
|
720 |
// requestor.
|
|
721 |
double_lock_wait(lockObject, THREAD);
|
|
722 |
}
|
|
723 |
// Check if classloading completed while we were waiting
|
|
724 |
klassOop check = find_class(d_index, d_hash, name, class_loader);
|
|
725 |
if (check != NULL) {
|
|
726 |
// Klass is already loaded, so just return it
|
|
727 |
k = instanceKlassHandle(THREAD, check);
|
|
728 |
class_has_been_loaded = true;
|
|
729 |
}
|
|
730 |
// check if other thread failed to load and cleaned up
|
|
731 |
oldprobe = placeholders()->get_entry(p_index, p_hash, name, class_loader);
|
|
732 |
}
|
|
733 |
}
|
|
734 |
}
|
|
735 |
}
|
|
736 |
// All cases: add LOAD_INSTANCE
|
|
737 |
// case 3: UnsyncloadClass: allow competing threads to try
|
|
738 |
// LOAD_INSTANCE in parallel
|
|
739 |
// add placeholder entry even if error - callers will remove on error
|
|
740 |
if (!class_has_been_loaded) {
|
|
741 |
PlaceholderEntry* newprobe = placeholders()->find_and_add(p_index, p_hash, name, class_loader, PlaceholderTable::LOAD_INSTANCE, nullsymbolHandle, THREAD);
|
|
742 |
if (throw_circularity_error) {
|
|
743 |
newprobe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE);
|
|
744 |
}
|
|
745 |
// For class loaders that do not acquire the classloader object lock,
|
|
746 |
// if they did not catch another thread holding LOAD_INSTANCE,
|
|
747 |
// need a check analogous to the acquire ObjectLocker/find_class
|
|
748 |
// i.e. now that we hold the LOAD_INSTANCE token on loading this class/CL
|
|
749 |
// one final check if the load has already completed
|
|
750 |
klassOop check = find_class(d_index, d_hash, name, class_loader);
|
|
751 |
if (check != NULL) {
|
|
752 |
// Klass is already loaded, so just return it
|
|
753 |
k = instanceKlassHandle(THREAD, check);
|
|
754 |
class_has_been_loaded = true;
|
|
755 |
newprobe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE);
|
|
756 |
}
|
|
757 |
}
|
|
758 |
}
|
|
759 |
// must throw error outside of owning lock
|
|
760 |
if (throw_circularity_error) {
|
|
761 |
ResourceMark rm(THREAD);
|
|
762 |
THROW_MSG_0(vmSymbols::java_lang_ClassCircularityError(), name->as_C_string());
|
|
763 |
}
|
|
764 |
|
|
765 |
if (!class_has_been_loaded) {
|
|
766 |
|
|
767 |
// Do actual loading
|
|
768 |
k = load_instance_class(name, class_loader, THREAD);
|
|
769 |
|
|
770 |
// In custom class loaders, the usual findClass calls
|
|
771 |
// findLoadedClass, which directly searches the SystemDictionary, then
|
|
772 |
// defineClass. If these are not atomic with respect to other threads,
|
|
773 |
// the findLoadedClass can fail, but the defineClass can get a
|
|
774 |
// LinkageError:: duplicate class definition.
|
|
775 |
// If they got a linkageError, check if a parallel class load succeeded.
|
|
776 |
// If it did, then for bytecode resolution the specification requires
|
|
777 |
// that we return the same result we did for the other thread, i.e. the
|
|
778 |
// successfully loaded instanceKlass
|
|
779 |
// Note: Class can not be unloaded as long as any classloader refs exist
|
|
780 |
// Should not get here for classloaders that support parallelism
|
|
781 |
// with the new cleaner mechanism, e.g. bootstrap classloader
|
|
782 |
if (UnsyncloadClass || (class_loader.is_null())) {
|
|
783 |
if (k.is_null() && HAS_PENDING_EXCEPTION
|
|
784 |
&& PENDING_EXCEPTION->is_a(SystemDictionary::linkageError_klass())) {
|
|
785 |
MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
786 |
klassOop check = find_class(d_index, d_hash, name, class_loader);
|
|
787 |
if (check != NULL) {
|
|
788 |
// Klass is already loaded, so just use it
|
|
789 |
k = instanceKlassHandle(THREAD, check);
|
|
790 |
CLEAR_PENDING_EXCEPTION;
|
|
791 |
guarantee((!class_loader.is_null()), "dup definition for bootstrap loader?");
|
|
792 |
}
|
|
793 |
}
|
|
794 |
}
|
|
795 |
|
|
796 |
// clean up placeholder entries for success or error
|
|
797 |
// This cleans up LOAD_INSTANCE entries
|
|
798 |
// It also cleans up LOAD_SUPER entries on errors from
|
|
799 |
// calling load_instance_class
|
|
800 |
{
|
|
801 |
MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
802 |
PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, name, class_loader);
|
|
803 |
if (probe != NULL) {
|
|
804 |
probe->remove_seen_thread(THREAD, PlaceholderTable::LOAD_INSTANCE);
|
|
805 |
placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD);
|
|
806 |
SystemDictionary_lock->notify_all();
|
|
807 |
}
|
|
808 |
}
|
|
809 |
|
|
810 |
// If everything was OK (no exceptions, no null return value), and
|
|
811 |
// class_loader is NOT the defining loader, do a little more bookkeeping.
|
|
812 |
if (!HAS_PENDING_EXCEPTION && !k.is_null() &&
|
|
813 |
k->class_loader() != class_loader()) {
|
|
814 |
|
|
815 |
check_constraints(d_index, d_hash, k, class_loader, false, THREAD);
|
|
816 |
|
|
817 |
// Need to check for a PENDING_EXCEPTION again; check_constraints
|
|
818 |
// can throw and doesn't use the CHECK macro.
|
|
819 |
if (!HAS_PENDING_EXCEPTION) {
|
|
820 |
{ // Grabbing the Compile_lock prevents systemDictionary updates
|
|
821 |
// during compilations.
|
|
822 |
MutexLocker mu(Compile_lock, THREAD);
|
|
823 |
update_dictionary(d_index, d_hash, p_index, p_hash,
|
|
824 |
k, class_loader, THREAD);
|
|
825 |
}
|
|
826 |
if (JvmtiExport::should_post_class_load()) {
|
|
827 |
Thread *thread = THREAD;
|
|
828 |
assert(thread->is_Java_thread(), "thread->is_Java_thread()");
|
|
829 |
JvmtiExport::post_class_load((JavaThread *) thread, k());
|
|
830 |
}
|
|
831 |
}
|
|
832 |
}
|
|
833 |
if (HAS_PENDING_EXCEPTION || k.is_null()) {
|
|
834 |
// On error, clean up placeholders
|
|
835 |
{
|
|
836 |
MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
837 |
placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD);
|
|
838 |
SystemDictionary_lock->notify_all();
|
|
839 |
}
|
|
840 |
return NULL;
|
|
841 |
}
|
|
842 |
}
|
|
843 |
}
|
|
844 |
|
|
845 |
#ifdef ASSERT
|
|
846 |
{
|
|
847 |
Handle loader (THREAD, k->class_loader());
|
|
848 |
MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
849 |
oop kk = find_class_or_placeholder(name, loader);
|
|
850 |
assert(kk == k(), "should be present in dictionary");
|
|
851 |
}
|
|
852 |
#endif
|
|
853 |
|
|
854 |
// return if the protection domain in NULL
|
|
855 |
if (protection_domain() == NULL) return k();
|
|
856 |
|
|
857 |
// Check the protection domain has the right access
|
|
858 |
{
|
|
859 |
MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
860 |
// Note that we have an entry, and entries can be deleted only during GC,
|
|
861 |
// so we cannot allow GC to occur while we're holding this entry.
|
|
862 |
// We're using a No_Safepoint_Verifier to catch any place where we
|
|
863 |
// might potentially do a GC at all.
|
|
864 |
// SystemDictionary::do_unloading() asserts that classes are only
|
|
865 |
// unloaded at a safepoint.
|
|
866 |
No_Safepoint_Verifier nosafepoint;
|
|
867 |
if (dictionary()->is_valid_protection_domain(d_index, d_hash, name,
|
|
868 |
class_loader,
|
|
869 |
protection_domain)) {
|
|
870 |
return k();
|
|
871 |
}
|
|
872 |
}
|
|
873 |
|
|
874 |
// Verify protection domain. If it fails an exception is thrown
|
|
875 |
validate_protection_domain(k, class_loader, protection_domain, CHECK_(klassOop(NULL)));
|
|
876 |
|
|
877 |
return k();
|
|
878 |
}
|
|
879 |
|
|
880 |
|
|
881 |
// This routine does not lock the system dictionary.
|
|
882 |
//
|
|
883 |
// Since readers don't hold a lock, we must make sure that system
|
|
884 |
// dictionary entries are only removed at a safepoint (when only one
|
|
885 |
// thread is running), and are added to in a safe way (all links must
|
|
886 |
// be updated in an MT-safe manner).
|
|
887 |
//
|
|
888 |
// Callers should be aware that an entry could be added just after
|
|
889 |
// _dictionary->bucket(index) is read here, so the caller will not see
|
|
890 |
// the new entry.
|
|
891 |
|
|
892 |
klassOop SystemDictionary::find(symbolHandle class_name,
|
|
893 |
Handle class_loader,
|
|
894 |
Handle protection_domain,
|
|
895 |
TRAPS) {
|
|
896 |
|
|
897 |
unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader);
|
|
898 |
int d_index = dictionary()->hash_to_index(d_hash);
|
|
899 |
|
|
900 |
{
|
|
901 |
// Note that we have an entry, and entries can be deleted only during GC,
|
|
902 |
// so we cannot allow GC to occur while we're holding this entry.
|
|
903 |
// We're using a No_Safepoint_Verifier to catch any place where we
|
|
904 |
// might potentially do a GC at all.
|
|
905 |
// SystemDictionary::do_unloading() asserts that classes are only
|
|
906 |
// unloaded at a safepoint.
|
|
907 |
No_Safepoint_Verifier nosafepoint;
|
|
908 |
return dictionary()->find(d_index, d_hash, class_name, class_loader,
|
|
909 |
protection_domain, THREAD);
|
|
910 |
}
|
|
911 |
}
|
|
912 |
|
|
913 |
|
|
914 |
// Look for a loaded instance or array klass by name. Do not do any loading.
|
|
915 |
// return NULL in case of error.
|
|
916 |
klassOop SystemDictionary::find_instance_or_array_klass(symbolHandle class_name,
|
|
917 |
Handle class_loader,
|
|
918 |
Handle protection_domain,
|
|
919 |
TRAPS) {
|
|
920 |
klassOop k = NULL;
|
|
921 |
assert(class_name() != NULL, "class name must be non NULL");
|
|
922 |
if (FieldType::is_array(class_name())) {
|
|
923 |
// The name refers to an array. Parse the name.
|
|
924 |
jint dimension;
|
|
925 |
symbolOop object_key;
|
|
926 |
|
|
927 |
// dimension and object_key are assigned as a side-effect of this call
|
|
928 |
BasicType t = FieldType::get_array_info(class_name(), &dimension,
|
|
929 |
&object_key, CHECK_(NULL));
|
|
930 |
if (t != T_OBJECT) {
|
|
931 |
k = Universe::typeArrayKlassObj(t);
|
|
932 |
} else {
|
|
933 |
symbolHandle h_key(THREAD, object_key);
|
|
934 |
k = SystemDictionary::find(h_key, class_loader, protection_domain, THREAD);
|
|
935 |
}
|
|
936 |
if (k != NULL) {
|
|
937 |
k = Klass::cast(k)->array_klass_or_null(dimension);
|
|
938 |
}
|
|
939 |
} else {
|
|
940 |
k = find(class_name, class_loader, protection_domain, THREAD);
|
|
941 |
}
|
|
942 |
return k;
|
|
943 |
}
|
|
944 |
|
|
945 |
// Note: this method is much like resolve_from_stream, but
|
|
946 |
// updates no supplemental data structures.
|
|
947 |
// TODO consolidate the two methods with a helper routine?
|
|
948 |
klassOop SystemDictionary::parse_stream(symbolHandle class_name,
|
|
949 |
Handle class_loader,
|
|
950 |
Handle protection_domain,
|
|
951 |
ClassFileStream* st,
|
|
952 |
TRAPS) {
|
|
953 |
symbolHandle parsed_name;
|
|
954 |
|
|
955 |
// Parse the stream. Note that we do this even though this klass might
|
|
956 |
// already be present in the SystemDictionary, otherwise we would not
|
|
957 |
// throw potential ClassFormatErrors.
|
|
958 |
//
|
|
959 |
// Note: "name" is updated.
|
|
960 |
// Further note: a placeholder will be added for this class when
|
|
961 |
// super classes are loaded (resolve_super_or_fail). We expect this
|
|
962 |
// to be called for all classes but java.lang.Object; and we preload
|
|
963 |
// java.lang.Object through resolve_or_fail, not this path.
|
|
964 |
|
|
965 |
instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name,
|
|
966 |
class_loader,
|
|
967 |
protection_domain,
|
|
968 |
parsed_name,
|
|
969 |
THREAD);
|
|
970 |
|
|
971 |
|
|
972 |
// We don't redefine the class, so we just need to clean up whether there
|
|
973 |
// was an error or not (don't want to modify any system dictionary
|
|
974 |
// data structures).
|
|
975 |
// Parsed name could be null if we threw an error before we got far
|
|
976 |
// enough along to parse it -- in that case, there is nothing to clean up.
|
|
977 |
if (!parsed_name.is_null()) {
|
|
978 |
unsigned int p_hash = placeholders()->compute_hash(parsed_name,
|
|
979 |
class_loader);
|
|
980 |
int p_index = placeholders()->hash_to_index(p_hash);
|
|
981 |
{
|
|
982 |
MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
983 |
placeholders()->find_and_remove(p_index, p_hash, parsed_name, class_loader, THREAD);
|
|
984 |
SystemDictionary_lock->notify_all();
|
|
985 |
}
|
|
986 |
}
|
|
987 |
|
|
988 |
return k();
|
|
989 |
}
|
|
990 |
|
|
991 |
// Add a klass to the system from a stream (called by jni_DefineClass and
|
|
992 |
// JVM_DefineClass).
|
|
993 |
// Note: class_name can be NULL. In that case we do not know the name of
|
|
994 |
// the class until we have parsed the stream.
|
|
995 |
|
|
996 |
klassOop SystemDictionary::resolve_from_stream(symbolHandle class_name,
|
|
997 |
Handle class_loader,
|
|
998 |
Handle protection_domain,
|
|
999 |
ClassFileStream* st,
|
|
1000 |
TRAPS) {
|
|
1001 |
|
|
1002 |
// Make sure we are synchronized on the class loader before we initiate
|
|
1003 |
// loading.
|
|
1004 |
Handle lockObject = compute_loader_lock_object(class_loader, THREAD);
|
|
1005 |
check_loader_lock_contention(lockObject, THREAD);
|
|
1006 |
ObjectLocker ol(lockObject, THREAD);
|
|
1007 |
|
|
1008 |
symbolHandle parsed_name;
|
|
1009 |
|
|
1010 |
// Parse the stream. Note that we do this even though this klass might
|
|
1011 |
// already be present in the SystemDictionary, otherwise we would not
|
|
1012 |
// throw potential ClassFormatErrors.
|
|
1013 |
//
|
|
1014 |
// Note: "name" is updated.
|
|
1015 |
// Further note: a placeholder will be added for this class when
|
|
1016 |
// super classes are loaded (resolve_super_or_fail). We expect this
|
|
1017 |
// to be called for all classes but java.lang.Object; and we preload
|
|
1018 |
// java.lang.Object through resolve_or_fail, not this path.
|
|
1019 |
|
|
1020 |
instanceKlassHandle k = ClassFileParser(st).parseClassFile(class_name,
|
|
1021 |
class_loader,
|
|
1022 |
protection_domain,
|
|
1023 |
parsed_name,
|
|
1024 |
THREAD);
|
|
1025 |
|
|
1026 |
const char* pkg = "java/";
|
|
1027 |
if (!HAS_PENDING_EXCEPTION &&
|
|
1028 |
!class_loader.is_null() &&
|
|
1029 |
!parsed_name.is_null() &&
|
|
1030 |
!strncmp((const char*)parsed_name->bytes(), pkg, strlen(pkg))) {
|
|
1031 |
// It is illegal to define classes in the "java." package from
|
|
1032 |
// JVM_DefineClass or jni_DefineClass unless you're the bootclassloader
|
|
1033 |
ResourceMark rm(THREAD);
|
|
1034 |
char* name = parsed_name->as_C_string();
|
|
1035 |
char* index = strrchr(name, '/');
|
|
1036 |
*index = '\0'; // chop to just the package name
|
|
1037 |
while ((index = strchr(name, '/')) != NULL) {
|
|
1038 |
*index = '.'; // replace '/' with '.' in package name
|
|
1039 |
}
|
|
1040 |
const char* fmt = "Prohibited package name: %s";
|
|
1041 |
size_t len = strlen(fmt) + strlen(name);
|
|
1042 |
char* message = NEW_RESOURCE_ARRAY(char, len);
|
|
1043 |
jio_snprintf(message, len, fmt, name);
|
|
1044 |
Exceptions::_throw_msg(THREAD_AND_LOCATION,
|
|
1045 |
vmSymbols::java_lang_SecurityException(), message);
|
|
1046 |
}
|
|
1047 |
|
|
1048 |
if (!HAS_PENDING_EXCEPTION) {
|
|
1049 |
assert(!parsed_name.is_null(), "Sanity");
|
|
1050 |
assert(class_name.is_null() || class_name() == parsed_name(),
|
|
1051 |
"name mismatch");
|
|
1052 |
// Verification prevents us from creating names with dots in them, this
|
|
1053 |
// asserts that that's the case.
|
|
1054 |
assert(is_internal_format(parsed_name),
|
|
1055 |
"external class name format used internally");
|
|
1056 |
|
|
1057 |
// Add class just loaded
|
|
1058 |
define_instance_class(k, THREAD);
|
|
1059 |
}
|
|
1060 |
|
|
1061 |
// If parsing the class file or define_instance_class failed, we
|
|
1062 |
// need to remove the placeholder added on our behalf. But we
|
|
1063 |
// must make sure parsed_name is valid first (it won't be if we had
|
|
1064 |
// a format error before the class was parsed far enough to
|
|
1065 |
// find the name).
|
|
1066 |
if (HAS_PENDING_EXCEPTION && !parsed_name.is_null()) {
|
|
1067 |
unsigned int p_hash = placeholders()->compute_hash(parsed_name,
|
|
1068 |
class_loader);
|
|
1069 |
int p_index = placeholders()->hash_to_index(p_hash);
|
|
1070 |
{
|
|
1071 |
MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
1072 |
placeholders()->find_and_remove(p_index, p_hash, parsed_name, class_loader, THREAD);
|
|
1073 |
SystemDictionary_lock->notify_all();
|
|
1074 |
}
|
|
1075 |
return NULL;
|
|
1076 |
}
|
|
1077 |
|
|
1078 |
// Make sure that we didn't leave a place holder in the
|
|
1079 |
// SystemDictionary; this is only done on success
|
|
1080 |
debug_only( {
|
|
1081 |
if (!HAS_PENDING_EXCEPTION) {
|
|
1082 |
assert(!parsed_name.is_null(), "parsed_name is still null?");
|
|
1083 |
symbolHandle h_name (THREAD, k->name());
|
|
1084 |
Handle h_loader (THREAD, k->class_loader());
|
|
1085 |
|
|
1086 |
MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
1087 |
|
|
1088 |
oop check = find_class_or_placeholder(parsed_name, class_loader);
|
|
1089 |
assert(check == k(), "should be present in the dictionary");
|
|
1090 |
|
|
1091 |
oop check2 = find_class_or_placeholder(h_name, h_loader);
|
|
1092 |
assert(check == check2, "name inconsistancy in SystemDictionary");
|
|
1093 |
}
|
|
1094 |
} );
|
|
1095 |
|
|
1096 |
return k();
|
|
1097 |
}
|
|
1098 |
|
|
1099 |
|
|
1100 |
void SystemDictionary::set_shared_dictionary(HashtableBucket* t, int length,
|
|
1101 |
int number_of_entries) {
|
|
1102 |
assert(length == _nof_buckets * sizeof(HashtableBucket),
|
|
1103 |
"bad shared dictionary size.");
|
|
1104 |
_shared_dictionary = new Dictionary(_nof_buckets, t, number_of_entries);
|
|
1105 |
}
|
|
1106 |
|
|
1107 |
|
|
1108 |
// If there is a shared dictionary, then find the entry for the
|
|
1109 |
// given shared system class, if any.
|
|
1110 |
|
|
1111 |
klassOop SystemDictionary::find_shared_class(symbolHandle class_name) {
|
|
1112 |
if (shared_dictionary() != NULL) {
|
|
1113 |
unsigned int d_hash = dictionary()->compute_hash(class_name, Handle());
|
|
1114 |
int d_index = dictionary()->hash_to_index(d_hash);
|
|
1115 |
return shared_dictionary()->find_shared_class(d_index, d_hash, class_name);
|
|
1116 |
} else {
|
|
1117 |
return NULL;
|
|
1118 |
}
|
|
1119 |
}
|
|
1120 |
|
|
1121 |
|
|
1122 |
// Load a class from the shared spaces (found through the shared system
|
|
1123 |
// dictionary). Force the superclass and all interfaces to be loaded.
|
|
1124 |
// Update the class definition to include sibling classes and no
|
|
1125 |
// subclasses (yet). [Classes in the shared space are not part of the
|
|
1126 |
// object hierarchy until loaded.]
|
|
1127 |
|
|
1128 |
instanceKlassHandle SystemDictionary::load_shared_class(
|
|
1129 |
symbolHandle class_name, Handle class_loader, TRAPS) {
|
|
1130 |
instanceKlassHandle ik (THREAD, find_shared_class(class_name));
|
|
1131 |
return load_shared_class(ik, class_loader, THREAD);
|
|
1132 |
}
|
|
1133 |
|
|
1134 |
// Note well! Changes to this method may affect oop access order
|
|
1135 |
// in the shared archive. Please take care to not make changes that
|
|
1136 |
// adversely affect cold start time by changing the oop access order
|
|
1137 |
// that is specified in dump.cpp MarkAndMoveOrderedReadOnly and
|
|
1138 |
// MarkAndMoveOrderedReadWrite closures.
|
|
1139 |
instanceKlassHandle SystemDictionary::load_shared_class(
|
|
1140 |
instanceKlassHandle ik, Handle class_loader, TRAPS) {
|
|
1141 |
assert(class_loader.is_null(), "non-null classloader for shared class?");
|
|
1142 |
if (ik.not_null()) {
|
|
1143 |
instanceKlassHandle nh = instanceKlassHandle(); // null Handle
|
|
1144 |
symbolHandle class_name(THREAD, ik->name());
|
|
1145 |
|
|
1146 |
// Found the class, now load the superclass and interfaces. If they
|
|
1147 |
// are shared, add them to the main system dictionary and reset
|
|
1148 |
// their hierarchy references (supers, subs, and interfaces).
|
|
1149 |
|
|
1150 |
if (ik->super() != NULL) {
|
|
1151 |
symbolHandle cn(THREAD, ik->super()->klass_part()->name());
|
|
1152 |
resolve_super_or_fail(class_name, cn,
|
|
1153 |
class_loader, Handle(), true, CHECK_(nh));
|
|
1154 |
}
|
|
1155 |
|
|
1156 |
objArrayHandle interfaces (THREAD, ik->local_interfaces());
|
|
1157 |
int num_interfaces = interfaces->length();
|
|
1158 |
for (int index = 0; index < num_interfaces; index++) {
|
|
1159 |
klassOop k = klassOop(interfaces->obj_at(index));
|
|
1160 |
|
|
1161 |
// Note: can not use instanceKlass::cast here because
|
|
1162 |
// interfaces' instanceKlass's C++ vtbls haven't been
|
|
1163 |
// reinitialized yet (they will be once the interface classes
|
|
1164 |
// are loaded)
|
|
1165 |
symbolHandle name (THREAD, k->klass_part()->name());
|
|
1166 |
resolve_super_or_fail(class_name, name, class_loader, Handle(), false, CHECK_(nh));
|
|
1167 |
}
|
|
1168 |
|
|
1169 |
// Adjust methods to recover missing data. They need addresses for
|
|
1170 |
// interpreter entry points and their default native method address
|
|
1171 |
// must be reset.
|
|
1172 |
|
|
1173 |
// Updating methods must be done under a lock so multiple
|
|
1174 |
// threads don't update these in parallel
|
|
1175 |
// Shared classes are all currently loaded by the bootstrap
|
|
1176 |
// classloader, so this will never cause a deadlock on
|
|
1177 |
// a custom class loader lock.
|
|
1178 |
|
|
1179 |
{
|
|
1180 |
Handle lockObject = compute_loader_lock_object(class_loader, THREAD);
|
|
1181 |
check_loader_lock_contention(lockObject, THREAD);
|
|
1182 |
ObjectLocker ol(lockObject, THREAD, true);
|
|
1183 |
|
|
1184 |
objArrayHandle methods (THREAD, ik->methods());
|
|
1185 |
int num_methods = methods->length();
|
|
1186 |
for (int index2 = 0; index2 < num_methods; ++index2) {
|
|
1187 |
methodHandle m(THREAD, methodOop(methods->obj_at(index2)));
|
|
1188 |
m()->link_method(m, CHECK_(nh));
|
|
1189 |
}
|
|
1190 |
}
|
|
1191 |
|
|
1192 |
if (TraceClassLoading) {
|
|
1193 |
ResourceMark rm;
|
|
1194 |
tty->print("[Loaded %s", ik->external_name());
|
|
1195 |
tty->print(" from shared objects file");
|
|
1196 |
tty->print_cr("]");
|
|
1197 |
}
|
|
1198 |
// notify a class loaded from shared object
|
|
1199 |
ClassLoadingService::notify_class_loaded(instanceKlass::cast(ik()),
|
|
1200 |
true /* shared class */);
|
|
1201 |
}
|
|
1202 |
return ik;
|
|
1203 |
}
|
|
1204 |
|
|
1205 |
#ifdef KERNEL
|
|
1206 |
// Some classes on the bootstrap class path haven't been installed on the
|
|
1207 |
// system yet. Call the DownloadManager method to make them appear in the
|
|
1208 |
// bootstrap class path and try again to load the named class.
|
|
1209 |
// Note that with delegation class loaders all classes in another loader will
|
|
1210 |
// first try to call this so it'd better be fast!!
|
|
1211 |
static instanceKlassHandle download_and_retry_class_load(
|
|
1212 |
symbolHandle class_name,
|
|
1213 |
TRAPS) {
|
|
1214 |
|
|
1215 |
klassOop dlm = SystemDictionary::sun_jkernel_DownloadManager_klass();
|
|
1216 |
instanceKlassHandle nk;
|
|
1217 |
|
|
1218 |
// If download manager class isn't loaded just return.
|
|
1219 |
if (dlm == NULL) return nk;
|
|
1220 |
|
|
1221 |
{ HandleMark hm(THREAD);
|
|
1222 |
ResourceMark rm(THREAD);
|
|
1223 |
Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nk));
|
|
1224 |
Handle class_string = java_lang_String::externalize_classname(s, CHECK_(nk));
|
|
1225 |
|
|
1226 |
// return value
|
|
1227 |
JavaValue result(T_OBJECT);
|
|
1228 |
|
|
1229 |
// Call the DownloadManager. We assume that it has a lock because
|
|
1230 |
// multiple classes could be not found and downloaded at the same time.
|
|
1231 |
// class sun.misc.DownloadManager;
|
|
1232 |
// public static String getBootClassPathEntryForClass(String className);
|
|
1233 |
JavaCalls::call_static(&result,
|
|
1234 |
KlassHandle(THREAD, dlm),
|
|
1235 |
vmSymbolHandles::getBootClassPathEntryForClass_name(),
|
|
1236 |
vmSymbolHandles::string_string_signature(),
|
|
1237 |
class_string,
|
|
1238 |
CHECK_(nk));
|
|
1239 |
|
|
1240 |
// Get result.string and add to bootclasspath
|
|
1241 |
assert(result.get_type() == T_OBJECT, "just checking");
|
|
1242 |
oop obj = (oop) result.get_jobject();
|
|
1243 |
if (obj == NULL) { return nk; }
|
|
1244 |
|
|
1245 |
char* new_class_name = java_lang_String::as_utf8_string(obj);
|
|
1246 |
|
|
1247 |
// lock the loader
|
|
1248 |
// we use this lock because JVMTI does.
|
|
1249 |
Handle loader_lock(THREAD, SystemDictionary::system_loader_lock());
|
|
1250 |
|
|
1251 |
ObjectLocker ol(loader_lock, THREAD);
|
|
1252 |
// add the file to the bootclasspath
|
|
1253 |
ClassLoader::update_class_path_entry_list(new_class_name, true);
|
|
1254 |
} // end HandleMark
|
|
1255 |
|
|
1256 |
if (TraceClassLoading) {
|
|
1257 |
ClassLoader::print_bootclasspath();
|
|
1258 |
}
|
|
1259 |
return ClassLoader::load_classfile(class_name, CHECK_(nk));
|
|
1260 |
}
|
|
1261 |
#endif // KERNEL
|
|
1262 |
|
|
1263 |
|
|
1264 |
instanceKlassHandle SystemDictionary::load_instance_class(symbolHandle class_name, Handle class_loader, TRAPS) {
|
|
1265 |
instanceKlassHandle nh = instanceKlassHandle(); // null Handle
|
|
1266 |
if (class_loader.is_null()) {
|
|
1267 |
// Search the shared system dictionary for classes preloaded into the
|
|
1268 |
// shared spaces.
|
|
1269 |
instanceKlassHandle k;
|
|
1270 |
k = load_shared_class(class_name, class_loader, THREAD);
|
|
1271 |
|
|
1272 |
if (k.is_null()) {
|
|
1273 |
// Use VM class loader
|
|
1274 |
k = ClassLoader::load_classfile(class_name, CHECK_(nh));
|
|
1275 |
}
|
|
1276 |
|
|
1277 |
#ifdef KERNEL
|
|
1278 |
// If the VM class loader has failed to load the class, call the
|
|
1279 |
// DownloadManager class to make it magically appear on the classpath
|
|
1280 |
// and try again. This is only configured with the Kernel VM.
|
|
1281 |
if (k.is_null()) {
|
|
1282 |
k = download_and_retry_class_load(class_name, CHECK_(nh));
|
|
1283 |
}
|
|
1284 |
#endif // KERNEL
|
|
1285 |
|
|
1286 |
// find_or_define_instance_class may return a different k
|
|
1287 |
if (!k.is_null()) {
|
|
1288 |
k = find_or_define_instance_class(class_name, class_loader, k, CHECK_(nh));
|
|
1289 |
}
|
|
1290 |
return k;
|
|
1291 |
} else {
|
|
1292 |
// Use user specified class loader to load class. Call loadClass operation on class_loader.
|
|
1293 |
ResourceMark rm(THREAD);
|
|
1294 |
|
|
1295 |
Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nh));
|
|
1296 |
// Translate to external class name format, i.e., convert '/' chars to '.'
|
|
1297 |
Handle string = java_lang_String::externalize_classname(s, CHECK_(nh));
|
|
1298 |
|
|
1299 |
JavaValue result(T_OBJECT);
|
|
1300 |
|
|
1301 |
KlassHandle spec_klass (THREAD, SystemDictionary::classloader_klass());
|
|
1302 |
|
|
1303 |
// UnsyncloadClass option means don't synchronize loadClass() calls.
|
|
1304 |
// loadClassInternal() is synchronized and public loadClass(String) is not.
|
|
1305 |
// This flag is for diagnostic purposes only. It is risky to call
|
|
1306 |
// custom class loaders without synchronization.
|
|
1307 |
// WARNING If a custom class loader does NOT synchronizer findClass, or callers of
|
|
1308 |
// findClass, this flag risks unexpected timing bugs in the field.
|
|
1309 |
// Do NOT assume this will be supported in future releases.
|
|
1310 |
if (!UnsyncloadClass && has_loadClassInternal()) {
|
|
1311 |
JavaCalls::call_special(&result,
|
|
1312 |
class_loader,
|
|
1313 |
spec_klass,
|
|
1314 |
vmSymbolHandles::loadClassInternal_name(),
|
|
1315 |
vmSymbolHandles::string_class_signature(),
|
|
1316 |
string,
|
|
1317 |
CHECK_(nh));
|
|
1318 |
} else {
|
|
1319 |
JavaCalls::call_virtual(&result,
|
|
1320 |
class_loader,
|
|
1321 |
spec_klass,
|
|
1322 |
vmSymbolHandles::loadClass_name(),
|
|
1323 |
vmSymbolHandles::string_class_signature(),
|
|
1324 |
string,
|
|
1325 |
CHECK_(nh));
|
|
1326 |
}
|
|
1327 |
|
|
1328 |
assert(result.get_type() == T_OBJECT, "just checking");
|
|
1329 |
oop obj = (oop) result.get_jobject();
|
|
1330 |
|
|
1331 |
// Primitive classes return null since forName() can not be
|
|
1332 |
// used to obtain any of the Class objects representing primitives or void
|
|
1333 |
if ((obj != NULL) && !(java_lang_Class::is_primitive(obj))) {
|
|
1334 |
instanceKlassHandle k =
|
|
1335 |
instanceKlassHandle(THREAD, java_lang_Class::as_klassOop(obj));
|
|
1336 |
// For user defined Java class loaders, check that the name returned is
|
|
1337 |
// the same as that requested. This check is done for the bootstrap
|
|
1338 |
// loader when parsing the class file.
|
|
1339 |
if (class_name() == k->name()) {
|
|
1340 |
return k;
|
|
1341 |
}
|
|
1342 |
}
|
|
1343 |
// Class is not found or has the wrong name, return NULL
|
|
1344 |
return nh;
|
|
1345 |
}
|
|
1346 |
}
|
|
1347 |
|
|
1348 |
void SystemDictionary::define_instance_class(instanceKlassHandle k, TRAPS) {
|
|
1349 |
|
|
1350 |
Handle class_loader_h(THREAD, k->class_loader());
|
|
1351 |
|
|
1352 |
// for bootstrap classloader don't acquire lock
|
|
1353 |
if (!class_loader_h.is_null()) {
|
|
1354 |
assert(ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD,
|
|
1355 |
compute_loader_lock_object(class_loader_h, THREAD)),
|
|
1356 |
"define called without lock");
|
|
1357 |
}
|
|
1358 |
|
|
1359 |
|
|
1360 |
// Check class-loading constraints. Throw exception if violation is detected.
|
|
1361 |
// Grabs and releases SystemDictionary_lock
|
|
1362 |
// The check_constraints/find_class call and update_dictionary sequence
|
|
1363 |
// must be "atomic" for a specific class/classloader pair so we never
|
|
1364 |
// define two different instanceKlasses for that class/classloader pair.
|
|
1365 |
// Existing classloaders will call define_instance_class with the
|
|
1366 |
// classloader lock held
|
|
1367 |
// Parallel classloaders will call find_or_define_instance_class
|
|
1368 |
// which will require a token to perform the define class
|
|
1369 |
symbolHandle name_h(THREAD, k->name());
|
|
1370 |
unsigned int d_hash = dictionary()->compute_hash(name_h, class_loader_h);
|
|
1371 |
int d_index = dictionary()->hash_to_index(d_hash);
|
|
1372 |
check_constraints(d_index, d_hash, k, class_loader_h, true, CHECK);
|
|
1373 |
|
|
1374 |
// Register class just loaded with class loader (placed in Vector)
|
|
1375 |
// Note we do this before updating the dictionary, as this can
|
|
1376 |
// fail with an OutOfMemoryError (if it does, we will *not* put this
|
|
1377 |
// class in the dictionary and will not update the class hierarchy).
|
|
1378 |
if (k->class_loader() != NULL) {
|
|
1379 |
methodHandle m(THREAD, Universe::loader_addClass_method());
|
|
1380 |
JavaValue result(T_VOID);
|
|
1381 |
JavaCallArguments args(class_loader_h);
|
|
1382 |
args.push_oop(Handle(THREAD, k->java_mirror()));
|
|
1383 |
JavaCalls::call(&result, m, &args, CHECK);
|
|
1384 |
}
|
|
1385 |
|
|
1386 |
// Add the new class. We need recompile lock during update of CHA.
|
|
1387 |
{
|
|
1388 |
unsigned int p_hash = placeholders()->compute_hash(name_h, class_loader_h);
|
|
1389 |
int p_index = placeholders()->hash_to_index(p_hash);
|
|
1390 |
|
|
1391 |
MutexLocker mu_r(Compile_lock, THREAD);
|
|
1392 |
|
|
1393 |
// Add to class hierarchy, initialize vtables, and do possible
|
|
1394 |
// deoptimizations.
|
|
1395 |
add_to_hierarchy(k, CHECK); // No exception, but can block
|
|
1396 |
|
|
1397 |
// Add to systemDictionary - so other classes can see it.
|
|
1398 |
// Grabs and releases SystemDictionary_lock
|
|
1399 |
update_dictionary(d_index, d_hash, p_index, p_hash,
|
|
1400 |
k, class_loader_h, THREAD);
|
|
1401 |
}
|
|
1402 |
k->eager_initialize(THREAD);
|
|
1403 |
|
|
1404 |
// notify jvmti
|
|
1405 |
if (JvmtiExport::should_post_class_load()) {
|
|
1406 |
assert(THREAD->is_Java_thread(), "thread->is_Java_thread()");
|
|
1407 |
JvmtiExport::post_class_load((JavaThread *) THREAD, k());
|
|
1408 |
|
|
1409 |
}
|
|
1410 |
}
|
|
1411 |
|
|
1412 |
// Support parallel classloading
|
|
1413 |
// Initial implementation for bootstrap classloader
|
|
1414 |
// For future:
|
|
1415 |
// For custom class loaders that support parallel classloading,
|
|
1416 |
// in case they do not synchronize around
|
|
1417 |
// FindLoadedClass/DefineClass calls, we check for parallel
|
|
1418 |
// loading for them, wait if a defineClass is in progress
|
|
1419 |
// and return the initial requestor's results
|
|
1420 |
// For better performance, the class loaders should synchronize
|
|
1421 |
// findClass(), i.e. FindLoadedClass/DefineClass or they
|
|
1422 |
// potentially waste time reading and parsing the bytestream.
|
|
1423 |
// Note: VM callers should ensure consistency of k/class_name,class_loader
|
|
1424 |
instanceKlassHandle SystemDictionary::find_or_define_instance_class(symbolHandle class_name, Handle class_loader, instanceKlassHandle k, TRAPS) {
|
|
1425 |
|
|
1426 |
instanceKlassHandle nh = instanceKlassHandle(); // null Handle
|
|
1427 |
|
|
1428 |
unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader);
|
|
1429 |
int d_index = dictionary()->hash_to_index(d_hash);
|
|
1430 |
|
|
1431 |
// Hold SD lock around find_class and placeholder creation for DEFINE_CLASS
|
|
1432 |
unsigned int p_hash = placeholders()->compute_hash(class_name, class_loader);
|
|
1433 |
int p_index = placeholders()->hash_to_index(p_hash);
|
|
1434 |
PlaceholderEntry* probe;
|
|
1435 |
|
|
1436 |
{
|
|
1437 |
MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
1438 |
// First check if class already defined
|
|
1439 |
klassOop check = find_class(d_index, d_hash, class_name, class_loader);
|
|
1440 |
if (check != NULL) {
|
|
1441 |
return(instanceKlassHandle(THREAD, check));
|
|
1442 |
}
|
|
1443 |
|
|
1444 |
// Acquire define token for this class/classloader
|
|
1445 |
symbolHandle nullsymbolHandle;
|
|
1446 |
probe = placeholders()->find_and_add(p_index, p_hash, class_name, class_loader, PlaceholderTable::DEFINE_CLASS, nullsymbolHandle, THREAD);
|
|
1447 |
// Check if another thread defining in parallel
|
|
1448 |
if (probe->definer() == NULL) {
|
|
1449 |
// Thread will define the class
|
|
1450 |
probe->set_definer(THREAD);
|
|
1451 |
} else {
|
|
1452 |
// Wait for defining thread to finish and return results
|
|
1453 |
while (probe->definer() != NULL) {
|
|
1454 |
SystemDictionary_lock->wait();
|
|
1455 |
}
|
|
1456 |
if (probe->instanceKlass() != NULL) {
|
|
1457 |
probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS);
|
|
1458 |
return(instanceKlassHandle(THREAD, probe->instanceKlass()));
|
|
1459 |
} else {
|
|
1460 |
// If definer had an error, try again as any new thread would
|
|
1461 |
probe->set_definer(THREAD);
|
|
1462 |
#ifdef ASSERT
|
|
1463 |
klassOop check = find_class(d_index, d_hash, class_name, class_loader);
|
|
1464 |
assert(check == NULL, "definer missed recording success");
|
|
1465 |
#endif
|
|
1466 |
}
|
|
1467 |
}
|
|
1468 |
}
|
|
1469 |
|
|
1470 |
define_instance_class(k, THREAD);
|
|
1471 |
|
|
1472 |
Handle linkage_exception = Handle(); // null handle
|
|
1473 |
|
|
1474 |
// definer must notify any waiting threads
|
|
1475 |
{
|
|
1476 |
MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
1477 |
PlaceholderEntry* probe = placeholders()->get_entry(p_index, p_hash, class_name, class_loader);
|
|
1478 |
assert(probe != NULL, "DEFINE_CLASS placeholder lost?");
|
|
1479 |
if (probe != NULL) {
|
|
1480 |
if (HAS_PENDING_EXCEPTION) {
|
|
1481 |
linkage_exception = Handle(THREAD,PENDING_EXCEPTION);
|
|
1482 |
CLEAR_PENDING_EXCEPTION;
|
|
1483 |
} else {
|
|
1484 |
probe->set_instanceKlass(k());
|
|
1485 |
}
|
|
1486 |
probe->set_definer(NULL);
|
|
1487 |
probe->remove_seen_thread(THREAD, PlaceholderTable::DEFINE_CLASS);
|
|
1488 |
SystemDictionary_lock->notify_all();
|
|
1489 |
}
|
|
1490 |
}
|
|
1491 |
|
|
1492 |
// Can't throw exception while holding lock due to rank ordering
|
|
1493 |
if (linkage_exception() != NULL) {
|
|
1494 |
THROW_OOP_(linkage_exception(), nh); // throws exception and returns
|
|
1495 |
}
|
|
1496 |
|
|
1497 |
return k;
|
|
1498 |
}
|
|
1499 |
|
|
1500 |
Handle SystemDictionary::compute_loader_lock_object(Handle class_loader, TRAPS) {
|
|
1501 |
// If class_loader is NULL we synchronize on _system_loader_lock_obj
|
|
1502 |
if (class_loader.is_null()) {
|
|
1503 |
return Handle(THREAD, _system_loader_lock_obj);
|
|
1504 |
} else {
|
|
1505 |
return class_loader;
|
|
1506 |
}
|
|
1507 |
}
|
|
1508 |
|
|
1509 |
// This method is added to check how often we have to wait to grab loader
|
|
1510 |
// lock. The results are being recorded in the performance counters defined in
|
|
1511 |
// ClassLoader::_sync_systemLoaderLockContentionRate and
|
|
1512 |
// ClassLoader::_sync_nonSystemLoaderLockConteionRate.
|
|
1513 |
void SystemDictionary::check_loader_lock_contention(Handle loader_lock, TRAPS) {
|
|
1514 |
if (!UsePerfData) {
|
|
1515 |
return;
|
|
1516 |
}
|
|
1517 |
|
|
1518 |
assert(!loader_lock.is_null(), "NULL lock object");
|
|
1519 |
|
|
1520 |
if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader_lock)
|
|
1521 |
== ObjectSynchronizer::owner_other) {
|
|
1522 |
// contention will likely happen, so increment the corresponding
|
|
1523 |
// contention counter.
|
|
1524 |
if (loader_lock() == _system_loader_lock_obj) {
|
|
1525 |
ClassLoader::sync_systemLoaderLockContentionRate()->inc();
|
|
1526 |
} else {
|
|
1527 |
ClassLoader::sync_nonSystemLoaderLockContentionRate()->inc();
|
|
1528 |
}
|
|
1529 |
}
|
|
1530 |
}
|
|
1531 |
|
|
1532 |
// ----------------------------------------------------------------------------
|
|
1533 |
// Lookup
|
|
1534 |
|
|
1535 |
klassOop SystemDictionary::find_class(int index, unsigned int hash,
|
|
1536 |
symbolHandle class_name,
|
|
1537 |
Handle class_loader) {
|
|
1538 |
assert_locked_or_safepoint(SystemDictionary_lock);
|
|
1539 |
assert (index == dictionary()->index_for(class_name, class_loader),
|
|
1540 |
"incorrect index?");
|
|
1541 |
|
|
1542 |
klassOop k = dictionary()->find_class(index, hash, class_name, class_loader);
|
|
1543 |
return k;
|
|
1544 |
}
|
|
1545 |
|
|
1546 |
|
|
1547 |
// Basic find on classes in the midst of being loaded
|
|
1548 |
symbolOop SystemDictionary::find_placeholder(int index, unsigned int hash,
|
|
1549 |
symbolHandle class_name,
|
|
1550 |
Handle class_loader) {
|
|
1551 |
assert_locked_or_safepoint(SystemDictionary_lock);
|
|
1552 |
|
|
1553 |
return placeholders()->find_entry(index, hash, class_name, class_loader);
|
|
1554 |
}
|
|
1555 |
|
|
1556 |
|
|
1557 |
// Used for assertions and verification only
|
|
1558 |
oop SystemDictionary::find_class_or_placeholder(symbolHandle class_name,
|
|
1559 |
Handle class_loader) {
|
|
1560 |
#ifndef ASSERT
|
|
1561 |
guarantee(VerifyBeforeGC ||
|
|
1562 |
VerifyDuringGC ||
|
|
1563 |
VerifyBeforeExit ||
|
|
1564 |
VerifyAfterGC, "too expensive");
|
|
1565 |
#endif
|
|
1566 |
assert_locked_or_safepoint(SystemDictionary_lock);
|
|
1567 |
symbolOop class_name_ = class_name();
|
|
1568 |
oop class_loader_ = class_loader();
|
|
1569 |
|
|
1570 |
// First look in the loaded class array
|
|
1571 |
unsigned int d_hash = dictionary()->compute_hash(class_name, class_loader);
|
|
1572 |
int d_index = dictionary()->hash_to_index(d_hash);
|
|
1573 |
oop lookup = find_class(d_index, d_hash, class_name, class_loader);
|
|
1574 |
|
|
1575 |
if (lookup == NULL) {
|
|
1576 |
// Next try the placeholders
|
|
1577 |
unsigned int p_hash = placeholders()->compute_hash(class_name,class_loader);
|
|
1578 |
int p_index = placeholders()->hash_to_index(p_hash);
|
|
1579 |
lookup = find_placeholder(p_index, p_hash, class_name, class_loader);
|
|
1580 |
}
|
|
1581 |
|
|
1582 |
return lookup;
|
|
1583 |
}
|
|
1584 |
|
|
1585 |
|
|
1586 |
// Get the next class in the diictionary.
|
|
1587 |
klassOop SystemDictionary::try_get_next_class() {
|
|
1588 |
return dictionary()->try_get_next_class();
|
|
1589 |
}
|
|
1590 |
|
|
1591 |
|
|
1592 |
// ----------------------------------------------------------------------------
|
|
1593 |
// Update hierachy. This is done before the new klass has been added to the SystemDictionary. The Recompile_lock
|
|
1594 |
// is held, to ensure that the compiler is not using the class hierachy, and that deoptimization will kick in
|
|
1595 |
// before a new class is used.
|
|
1596 |
|
|
1597 |
void SystemDictionary::add_to_hierarchy(instanceKlassHandle k, TRAPS) {
|
|
1598 |
assert(k.not_null(), "just checking");
|
|
1599 |
// Link into hierachy. Make sure the vtables are initialized before linking into
|
|
1600 |
k->append_to_sibling_list(); // add to superklass/sibling list
|
|
1601 |
k->process_interfaces(THREAD); // handle all "implements" declarations
|
|
1602 |
k->set_init_state(instanceKlass::loaded);
|
|
1603 |
// Now flush all code that depended on old class hierarchy.
|
|
1604 |
// Note: must be done *after* linking k into the hierarchy (was bug 12/9/97)
|
|
1605 |
// Also, first reinitialize vtable because it may have gotten out of synch
|
|
1606 |
// while the new class wasn't connected to the class hierarchy.
|
|
1607 |
Universe::flush_dependents_on(k);
|
|
1608 |
}
|
|
1609 |
|
|
1610 |
|
|
1611 |
// ----------------------------------------------------------------------------
|
|
1612 |
// GC support
|
|
1613 |
|
|
1614 |
// Following roots during mark-sweep is separated in two phases.
|
|
1615 |
//
|
|
1616 |
// The first phase follows preloaded classes and all other system
|
|
1617 |
// classes, since these will never get unloaded anyway.
|
|
1618 |
//
|
|
1619 |
// The second phase removes (unloads) unreachable classes from the
|
|
1620 |
// system dictionary and follows the remaining classes' contents.
|
|
1621 |
|
|
1622 |
void SystemDictionary::always_strong_oops_do(OopClosure* blk) {
|
|
1623 |
// Follow preloaded classes/mirrors and system loader object
|
|
1624 |
blk->do_oop(&_java_system_loader);
|
|
1625 |
preloaded_oops_do(blk);
|
|
1626 |
always_strong_classes_do(blk);
|
|
1627 |
}
|
|
1628 |
|
|
1629 |
|
|
1630 |
void SystemDictionary::always_strong_classes_do(OopClosure* blk) {
|
|
1631 |
// Follow all system classes and temporary placeholders in dictionary
|
|
1632 |
dictionary()->always_strong_classes_do(blk);
|
|
1633 |
|
|
1634 |
// Placeholders. These are *always* strong roots, as they
|
|
1635 |
// represent classes we're actively loading.
|
|
1636 |
placeholders_do(blk);
|
|
1637 |
|
|
1638 |
// Loader constraints. We must keep the symbolOop used in the name alive.
|
|
1639 |
constraints()->always_strong_classes_do(blk);
|
|
1640 |
|
|
1641 |
// Resolution errors keep the symbolOop for the error alive
|
|
1642 |
resolution_errors()->always_strong_classes_do(blk);
|
|
1643 |
}
|
|
1644 |
|
|
1645 |
|
|
1646 |
void SystemDictionary::placeholders_do(OopClosure* blk) {
|
|
1647 |
placeholders()->oops_do(blk);
|
|
1648 |
}
|
|
1649 |
|
|
1650 |
|
|
1651 |
bool SystemDictionary::do_unloading(BoolObjectClosure* is_alive) {
|
|
1652 |
bool result = dictionary()->do_unloading(is_alive);
|
|
1653 |
constraints()->purge_loader_constraints(is_alive);
|
|
1654 |
resolution_errors()->purge_resolution_errors(is_alive);
|
|
1655 |
return result;
|
|
1656 |
}
|
|
1657 |
|
|
1658 |
|
|
1659 |
// The mirrors are scanned by shared_oops_do() which is
|
|
1660 |
// not called by oops_do(). In order to process oops in
|
|
1661 |
// a necessary order, shared_oops_do() is call by
|
|
1662 |
// Universe::oops_do().
|
|
1663 |
void SystemDictionary::oops_do(OopClosure* f) {
|
|
1664 |
// Adjust preloaded classes and system loader object
|
|
1665 |
f->do_oop(&_java_system_loader);
|
|
1666 |
preloaded_oops_do(f);
|
|
1667 |
|
|
1668 |
lazily_loaded_oops_do(f);
|
|
1669 |
|
|
1670 |
// Adjust dictionary
|
|
1671 |
dictionary()->oops_do(f);
|
|
1672 |
|
|
1673 |
// Partially loaded classes
|
|
1674 |
placeholders()->oops_do(f);
|
|
1675 |
|
|
1676 |
// Adjust constraint table
|
|
1677 |
constraints()->oops_do(f);
|
|
1678 |
|
|
1679 |
// Adjust resolution error table
|
|
1680 |
resolution_errors()->oops_do(f);
|
|
1681 |
}
|
|
1682 |
|
|
1683 |
|
|
1684 |
void SystemDictionary::preloaded_oops_do(OopClosure* f) {
|
|
1685 |
f->do_oop((oop*) &_string_klass);
|
|
1686 |
f->do_oop((oop*) &_object_klass);
|
|
1687 |
f->do_oop((oop*) &_class_klass);
|
|
1688 |
f->do_oop((oop*) &_cloneable_klass);
|
|
1689 |
f->do_oop((oop*) &_classloader_klass);
|
|
1690 |
f->do_oop((oop*) &_serializable_klass);
|
|
1691 |
f->do_oop((oop*) &_system_klass);
|
|
1692 |
|
|
1693 |
f->do_oop((oop*) &_throwable_klass);
|
|
1694 |
f->do_oop((oop*) &_error_klass);
|
|
1695 |
f->do_oop((oop*) &_threaddeath_klass);
|
|
1696 |
f->do_oop((oop*) &_exception_klass);
|
|
1697 |
f->do_oop((oop*) &_runtime_exception_klass);
|
|
1698 |
f->do_oop((oop*) &_classNotFoundException_klass);
|
|
1699 |
f->do_oop((oop*) &_noClassDefFoundError_klass);
|
|
1700 |
f->do_oop((oop*) &_linkageError_klass);
|
|
1701 |
f->do_oop((oop*) &_classCastException_klass);
|
|
1702 |
f->do_oop((oop*) &_arrayStoreException_klass);
|
|
1703 |
f->do_oop((oop*) &_virtualMachineError_klass);
|
|
1704 |
f->do_oop((oop*) &_outOfMemoryError_klass);
|
|
1705 |
f->do_oop((oop*) &_StackOverflowError_klass);
|
|
1706 |
f->do_oop((oop*) &_illegalMonitorStateException_klass);
|
|
1707 |
f->do_oop((oop*) &_protectionDomain_klass);
|
|
1708 |
f->do_oop((oop*) &_AccessControlContext_klass);
|
|
1709 |
|
|
1710 |
f->do_oop((oop*) &_reference_klass);
|
|
1711 |
f->do_oop((oop*) &_soft_reference_klass);
|
|
1712 |
f->do_oop((oop*) &_weak_reference_klass);
|
|
1713 |
f->do_oop((oop*) &_final_reference_klass);
|
|
1714 |
f->do_oop((oop*) &_phantom_reference_klass);
|
|
1715 |
f->do_oop((oop*) &_finalizer_klass);
|
|
1716 |
|
|
1717 |
f->do_oop((oop*) &_thread_klass);
|
|
1718 |
f->do_oop((oop*) &_threadGroup_klass);
|
|
1719 |
f->do_oop((oop*) &_properties_klass);
|
|
1720 |
f->do_oop((oop*) &_reflect_accessible_object_klass);
|
|
1721 |
f->do_oop((oop*) &_reflect_field_klass);
|
|
1722 |
f->do_oop((oop*) &_reflect_method_klass);
|
|
1723 |
f->do_oop((oop*) &_reflect_constructor_klass);
|
|
1724 |
f->do_oop((oop*) &_reflect_magic_klass);
|
|
1725 |
f->do_oop((oop*) &_reflect_method_accessor_klass);
|
|
1726 |
f->do_oop((oop*) &_reflect_constructor_accessor_klass);
|
|
1727 |
f->do_oop((oop*) &_reflect_delegating_classloader_klass);
|
|
1728 |
f->do_oop((oop*) &_reflect_constant_pool_klass);
|
|
1729 |
f->do_oop((oop*) &_reflect_unsafe_static_field_accessor_impl_klass);
|
|
1730 |
|
|
1731 |
f->do_oop((oop*) &_stringBuffer_klass);
|
|
1732 |
f->do_oop((oop*) &_vector_klass);
|
|
1733 |
f->do_oop((oop*) &_hashtable_klass);
|
|
1734 |
|
|
1735 |
f->do_oop((oop*) &_stackTraceElement_klass);
|
|
1736 |
|
|
1737 |
f->do_oop((oop*) &_java_nio_Buffer_klass);
|
|
1738 |
|
|
1739 |
f->do_oop((oop*) &_sun_misc_AtomicLongCSImpl_klass);
|
|
1740 |
f->do_oop((oop*) &_sun_jkernel_DownloadManager_klass);
|
|
1741 |
|
|
1742 |
f->do_oop((oop*) &_boolean_klass);
|
|
1743 |
f->do_oop((oop*) &_char_klass);
|
|
1744 |
f->do_oop((oop*) &_float_klass);
|
|
1745 |
f->do_oop((oop*) &_double_klass);
|
|
1746 |
f->do_oop((oop*) &_byte_klass);
|
|
1747 |
f->do_oop((oop*) &_short_klass);
|
|
1748 |
f->do_oop((oop*) &_int_klass);
|
|
1749 |
f->do_oop((oop*) &_long_klass);
|
|
1750 |
{
|
|
1751 |
for (int i = 0; i < T_VOID+1; i++) {
|
|
1752 |
if (_box_klasses[i] != NULL) {
|
|
1753 |
assert(i >= T_BOOLEAN, "checking");
|
|
1754 |
f->do_oop((oop*) &_box_klasses[i]);
|
|
1755 |
}
|
|
1756 |
}
|
|
1757 |
}
|
|
1758 |
|
|
1759 |
// The basic type mirrors would have already been processed in
|
|
1760 |
// Universe::oops_do(), via a call to shared_oops_do(), so should
|
|
1761 |
// not be processed again.
|
|
1762 |
|
|
1763 |
f->do_oop((oop*) &_system_loader_lock_obj);
|
|
1764 |
FilteredFieldsMap::klasses_oops_do(f);
|
|
1765 |
}
|
|
1766 |
|
|
1767 |
void SystemDictionary::lazily_loaded_oops_do(OopClosure* f) {
|
|
1768 |
f->do_oop((oop*) &_abstract_ownable_synchronizer_klass);
|
|
1769 |
}
|
|
1770 |
|
|
1771 |
// Just the classes from defining class loaders
|
|
1772 |
// Don't iterate over placeholders
|
|
1773 |
void SystemDictionary::classes_do(void f(klassOop)) {
|
|
1774 |
dictionary()->classes_do(f);
|
|
1775 |
}
|
|
1776 |
|
|
1777 |
// Added for initialize_itable_for_klass
|
|
1778 |
// Just the classes from defining class loaders
|
|
1779 |
// Don't iterate over placeholders
|
|
1780 |
void SystemDictionary::classes_do(void f(klassOop, TRAPS), TRAPS) {
|
|
1781 |
dictionary()->classes_do(f, CHECK);
|
|
1782 |
}
|
|
1783 |
|
|
1784 |
// All classes, and their class loaders
|
|
1785 |
// Don't iterate over placeholders
|
|
1786 |
void SystemDictionary::classes_do(void f(klassOop, oop)) {
|
|
1787 |
dictionary()->classes_do(f);
|
|
1788 |
}
|
|
1789 |
|
|
1790 |
// All classes, and their class loaders
|
|
1791 |
// (added for helpers that use HandleMarks and ResourceMarks)
|
|
1792 |
// Don't iterate over placeholders
|
|
1793 |
void SystemDictionary::classes_do(void f(klassOop, oop, TRAPS), TRAPS) {
|
|
1794 |
dictionary()->classes_do(f, CHECK);
|
|
1795 |
}
|
|
1796 |
|
|
1797 |
void SystemDictionary::placeholders_do(void f(symbolOop, oop)) {
|
|
1798 |
placeholders()->entries_do(f);
|
|
1799 |
}
|
|
1800 |
|
|
1801 |
void SystemDictionary::methods_do(void f(methodOop)) {
|
|
1802 |
dictionary()->methods_do(f);
|
|
1803 |
}
|
|
1804 |
|
|
1805 |
// ----------------------------------------------------------------------------
|
|
1806 |
// Lazily load klasses
|
|
1807 |
|
|
1808 |
void SystemDictionary::load_abstract_ownable_synchronizer_klass(TRAPS) {
|
|
1809 |
assert(JDK_Version::is_gte_jdk16x_version(), "Must be JDK 1.6 or later");
|
|
1810 |
|
|
1811 |
// if multiple threads calling this function, only one thread will load
|
|
1812 |
// the class. The other threads will find the loaded version once the
|
|
1813 |
// class is loaded.
|
|
1814 |
klassOop aos = _abstract_ownable_synchronizer_klass;
|
|
1815 |
if (aos == NULL) {
|
|
1816 |
klassOop k = resolve_or_fail(vmSymbolHandles::java_util_concurrent_locks_AbstractOwnableSynchronizer(), true, CHECK);
|
|
1817 |
// Force a fence to prevent any read before the write completes
|
|
1818 |
OrderAccess::fence();
|
|
1819 |
_abstract_ownable_synchronizer_klass = k;
|
|
1820 |
}
|
|
1821 |
}
|
|
1822 |
|
|
1823 |
// ----------------------------------------------------------------------------
|
|
1824 |
// Initialization
|
|
1825 |
|
|
1826 |
void SystemDictionary::initialize(TRAPS) {
|
|
1827 |
// Allocate arrays
|
|
1828 |
assert(dictionary() == NULL,
|
|
1829 |
"SystemDictionary should only be initialized once");
|
|
1830 |
_dictionary = new Dictionary(_nof_buckets);
|
|
1831 |
_placeholders = new PlaceholderTable(_nof_buckets);
|
|
1832 |
_number_of_modifications = 0;
|
|
1833 |
_loader_constraints = new LoaderConstraintTable(_loader_constraint_size);
|
|
1834 |
_resolution_errors = new ResolutionErrorTable(_resolution_error_size);
|
|
1835 |
|
|
1836 |
// Allocate private object used as system class loader lock
|
|
1837 |
_system_loader_lock_obj = oopFactory::new_system_objArray(0, CHECK);
|
|
1838 |
// Initialize basic classes
|
|
1839 |
initialize_preloaded_classes(CHECK);
|
|
1840 |
}
|
|
1841 |
|
|
1842 |
|
|
1843 |
void SystemDictionary::initialize_preloaded_classes(TRAPS) {
|
|
1844 |
assert(_object_klass == NULL, "preloaded classes should only be initialized once");
|
|
1845 |
// Preload commonly used klasses
|
|
1846 |
_object_klass = resolve_or_fail(vmSymbolHandles::java_lang_Object(), true, CHECK);
|
|
1847 |
_string_klass = resolve_or_fail(vmSymbolHandles::java_lang_String(), true, CHECK);
|
|
1848 |
_class_klass = resolve_or_fail(vmSymbolHandles::java_lang_Class(), true, CHECK);
|
|
1849 |
debug_only(instanceKlass::verify_class_klass_nonstatic_oop_maps(_class_klass));
|
|
1850 |
// Fixup mirrors for classes loaded before java.lang.Class.
|
|
1851 |
// These calls iterate over the objects currently in the perm gen
|
|
1852 |
// so calling them at this point is matters (not before when there
|
|
1853 |
// are fewer objects and not later after there are more objects
|
|
1854 |
// in the perm gen.
|
|
1855 |
Universe::initialize_basic_type_mirrors(CHECK);
|
|
1856 |
Universe::fixup_mirrors(CHECK);
|
|
1857 |
|
|
1858 |
_cloneable_klass = resolve_or_fail(vmSymbolHandles::java_lang_Cloneable(), true, CHECK);
|
|
1859 |
_classloader_klass = resolve_or_fail(vmSymbolHandles::java_lang_ClassLoader(), true, CHECK);
|
|
1860 |
_serializable_klass = resolve_or_fail(vmSymbolHandles::java_io_Serializable(), true, CHECK);
|
|
1861 |
_system_klass = resolve_or_fail(vmSymbolHandles::java_lang_System(), true, CHECK);
|
|
1862 |
|
|
1863 |
_throwable_klass = resolve_or_fail(vmSymbolHandles::java_lang_Throwable(), true, CHECK);
|
|
1864 |
_error_klass = resolve_or_fail(vmSymbolHandles::java_lang_Error(), true, CHECK);
|
|
1865 |
_threaddeath_klass = resolve_or_fail(vmSymbolHandles::java_lang_ThreadDeath(), true, CHECK);
|
|
1866 |
_exception_klass = resolve_or_fail(vmSymbolHandles::java_lang_Exception(), true, CHECK);
|
|
1867 |
_runtime_exception_klass = resolve_or_fail(vmSymbolHandles::java_lang_RuntimeException(), true, CHECK);
|
|
1868 |
_protectionDomain_klass = resolve_or_fail(vmSymbolHandles::java_security_ProtectionDomain(), true, CHECK);
|
|
1869 |
_AccessControlContext_klass = resolve_or_fail(vmSymbolHandles::java_security_AccessControlContext(), true, CHECK);
|
|
1870 |
_classNotFoundException_klass = resolve_or_fail(vmSymbolHandles::java_lang_ClassNotFoundException(), true, CHECK);
|
|
1871 |
_noClassDefFoundError_klass = resolve_or_fail(vmSymbolHandles::java_lang_NoClassDefFoundError(), true, CHECK);
|
|
1872 |
_linkageError_klass = resolve_or_fail(vmSymbolHandles::java_lang_LinkageError(), true, CHECK);
|
|
1873 |
_classCastException_klass = resolve_or_fail(vmSymbolHandles::java_lang_ClassCastException(), true, CHECK);
|
|
1874 |
_arrayStoreException_klass = resolve_or_fail(vmSymbolHandles::java_lang_ArrayStoreException(), true, CHECK);
|
|
1875 |
_virtualMachineError_klass = resolve_or_fail(vmSymbolHandles::java_lang_VirtualMachineError(), true, CHECK);
|
|
1876 |
_outOfMemoryError_klass = resolve_or_fail(vmSymbolHandles::java_lang_OutOfMemoryError(), true, CHECK);
|
|
1877 |
_StackOverflowError_klass = resolve_or_fail(vmSymbolHandles::java_lang_StackOverflowError(), true, CHECK);
|
|
1878 |
_illegalMonitorStateException_klass = resolve_or_fail(vmSymbolHandles::java_lang_IllegalMonitorStateException(), true, CHECK);
|
|
1879 |
|
|
1880 |
// Preload ref klasses and set reference types
|
|
1881 |
_reference_klass = resolve_or_fail(vmSymbolHandles::java_lang_ref_Reference(), true, CHECK);
|
|
1882 |
instanceKlass::cast(_reference_klass)->set_reference_type(REF_OTHER);
|
|
1883 |
instanceRefKlass::update_nonstatic_oop_maps(_reference_klass);
|
|
1884 |
|
|
1885 |
_soft_reference_klass = resolve_or_fail(vmSymbolHandles::java_lang_ref_SoftReference(), true, CHECK);
|
|
1886 |
instanceKlass::cast(_soft_reference_klass)->set_reference_type(REF_SOFT);
|
|
1887 |
_weak_reference_klass = resolve_or_fail(vmSymbolHandles::java_lang_ref_WeakReference(), true, CHECK);
|
|
1888 |
instanceKlass::cast(_weak_reference_klass)->set_reference_type(REF_WEAK);
|
|
1889 |
_final_reference_klass = resolve_or_fail(vmSymbolHandles::java_lang_ref_FinalReference(), true, CHECK);
|
|
1890 |
instanceKlass::cast(_final_reference_klass)->set_reference_type(REF_FINAL);
|
|
1891 |
_phantom_reference_klass = resolve_or_fail(vmSymbolHandles::java_lang_ref_PhantomReference(), true, CHECK);
|
|
1892 |
instanceKlass::cast(_phantom_reference_klass)->set_reference_type(REF_PHANTOM);
|
|
1893 |
_finalizer_klass = resolve_or_fail(vmSymbolHandles::java_lang_ref_Finalizer(), true, CHECK);
|
|
1894 |
|
|
1895 |
_thread_klass = resolve_or_fail(vmSymbolHandles::java_lang_Thread(), true, CHECK);
|
|
1896 |
_threadGroup_klass = resolve_or_fail(vmSymbolHandles::java_lang_ThreadGroup(), true, CHECK);
|
|
1897 |
_properties_klass = resolve_or_fail(vmSymbolHandles::java_util_Properties(), true, CHECK);
|
|
1898 |
_reflect_accessible_object_klass = resolve_or_fail(vmSymbolHandles::java_lang_reflect_AccessibleObject(), true, CHECK);
|
|
1899 |
_reflect_field_klass = resolve_or_fail(vmSymbolHandles::java_lang_reflect_Field(), true, CHECK);
|
|
1900 |
_reflect_method_klass = resolve_or_fail(vmSymbolHandles::java_lang_reflect_Method(), true, CHECK);
|
|
1901 |
_reflect_constructor_klass = resolve_or_fail(vmSymbolHandles::java_lang_reflect_Constructor(), true, CHECK);
|
|
1902 |
// Universe::is_gte_jdk14x_version() is not set up by this point.
|
|
1903 |
// It's okay if these turn out to be NULL in non-1.4 JDKs.
|
|
1904 |
_reflect_magic_klass = resolve_or_null(vmSymbolHandles::sun_reflect_MagicAccessorImpl(), CHECK);
|
|
1905 |
_reflect_method_accessor_klass = resolve_or_null(vmSymbolHandles::sun_reflect_MethodAccessorImpl(), CHECK);
|
|
1906 |
_reflect_constructor_accessor_klass = resolve_or_null(vmSymbolHandles::sun_reflect_ConstructorAccessorImpl(), CHECK);
|
|
1907 |
_reflect_delegating_classloader_klass = resolve_or_null(vmSymbolHandles::sun_reflect_DelegatingClassLoader(), CHECK);
|
|
1908 |
_reflect_constant_pool_klass = resolve_or_null(vmSymbolHandles::sun_reflect_ConstantPool(), CHECK);
|
|
1909 |
_reflect_unsafe_static_field_accessor_impl_klass = resolve_or_null(vmSymbolHandles::sun_reflect_UnsafeStaticFieldAccessorImpl(), CHECK);
|
|
1910 |
|
|
1911 |
_vector_klass = resolve_or_fail(vmSymbolHandles::java_util_Vector(), true, CHECK);
|
|
1912 |
_hashtable_klass = resolve_or_fail(vmSymbolHandles::java_util_Hashtable(), true, CHECK);
|
|
1913 |
_stringBuffer_klass = resolve_or_fail(vmSymbolHandles::java_lang_StringBuffer(), true, CHECK);
|
|
1914 |
|
|
1915 |
// It's NULL in non-1.4 JDKs.
|
|
1916 |
_stackTraceElement_klass = resolve_or_null(vmSymbolHandles::java_lang_StackTraceElement(), CHECK);
|
|
1917 |
|
|
1918 |
// Universe::is_gte_jdk14x_version() is not set up by this point.
|
|
1919 |
// It's okay if this turns out to be NULL in non-1.4 JDKs.
|
|
1920 |
_java_nio_Buffer_klass = resolve_or_null(vmSymbolHandles::java_nio_Buffer(), CHECK);
|
|
1921 |
|
|
1922 |
// If this class isn't present, it won't be referenced.
|
|
1923 |
_sun_misc_AtomicLongCSImpl_klass = resolve_or_null(vmSymbolHandles::sun_misc_AtomicLongCSImpl(), CHECK);
|
|
1924 |
#ifdef KERNEL
|
|
1925 |
_sun_jkernel_DownloadManager_klass = resolve_or_null(vmSymbolHandles::sun_jkernel_DownloadManager(), CHECK);
|
|
1926 |
if (_sun_jkernel_DownloadManager_klass == NULL) {
|
|
1927 |
warning("Cannot find sun/jkernel/DownloadManager");
|
|
1928 |
}
|
|
1929 |
#endif // KERNEL
|
|
1930 |
|
|
1931 |
// Preload boxing klasses
|
|
1932 |
_boolean_klass = resolve_or_fail(vmSymbolHandles::java_lang_Boolean(), true, CHECK);
|
|
1933 |
_char_klass = resolve_or_fail(vmSymbolHandles::java_lang_Character(), true, CHECK);
|
|
1934 |
_float_klass = resolve_or_fail(vmSymbolHandles::java_lang_Float(), true, CHECK);
|
|
1935 |
_double_klass = resolve_or_fail(vmSymbolHandles::java_lang_Double(), true, CHECK);
|
|
1936 |
_byte_klass = resolve_or_fail(vmSymbolHandles::java_lang_Byte(), true, CHECK);
|
|
1937 |
_short_klass = resolve_or_fail(vmSymbolHandles::java_lang_Short(), true, CHECK);
|
|
1938 |
_int_klass = resolve_or_fail(vmSymbolHandles::java_lang_Integer(), true, CHECK);
|
|
1939 |
_long_klass = resolve_or_fail(vmSymbolHandles::java_lang_Long(), true, CHECK);
|
|
1940 |
|
|
1941 |
_box_klasses[T_BOOLEAN] = _boolean_klass;
|
|
1942 |
_box_klasses[T_CHAR] = _char_klass;
|
|
1943 |
_box_klasses[T_FLOAT] = _float_klass;
|
|
1944 |
_box_klasses[T_DOUBLE] = _double_klass;
|
|
1945 |
_box_klasses[T_BYTE] = _byte_klass;
|
|
1946 |
_box_klasses[T_SHORT] = _short_klass;
|
|
1947 |
_box_klasses[T_INT] = _int_klass;
|
|
1948 |
_box_klasses[T_LONG] = _long_klass;
|
|
1949 |
//_box_klasses[T_OBJECT] = _object_klass;
|
|
1950 |
//_box_klasses[T_ARRAY] = _object_klass;
|
|
1951 |
|
|
1952 |
{ // Compute whether we should use loadClass or loadClassInternal when loading classes.
|
|
1953 |
methodOop method = instanceKlass::cast(classloader_klass())->find_method(vmSymbols::loadClassInternal_name(), vmSymbols::string_class_signature());
|
|
1954 |
_has_loadClassInternal = (method != NULL);
|
|
1955 |
}
|
|
1956 |
|
|
1957 |
{ // Compute whether we should use checkPackageAccess or NOT
|
|
1958 |
methodOop method = instanceKlass::cast(classloader_klass())->find_method(vmSymbols::checkPackageAccess_name(), vmSymbols::class_protectiondomain_signature());
|
|
1959 |
_has_checkPackageAccess = (method != NULL);
|
|
1960 |
}
|
|
1961 |
}
|
|
1962 |
|
|
1963 |
// Tells if a given klass is a box (wrapper class, such as java.lang.Integer).
|
|
1964 |
// If so, returns the basic type it holds. If not, returns T_OBJECT.
|
|
1965 |
BasicType SystemDictionary::box_klass_type(klassOop k) {
|
|
1966 |
assert(k != NULL, "");
|
|
1967 |
for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
|
|
1968 |
if (_box_klasses[i] == k)
|
|
1969 |
return (BasicType)i;
|
|
1970 |
}
|
|
1971 |
return T_OBJECT;
|
|
1972 |
}
|
|
1973 |
|
|
1974 |
// Constraints on class loaders. The details of the algorithm can be
|
|
1975 |
// found in the OOPSLA'98 paper "Dynamic Class Loading in the Java
|
|
1976 |
// Virtual Machine" by Sheng Liang and Gilad Bracha. The basic idea is
|
|
1977 |
// that the system dictionary needs to maintain a set of contraints that
|
|
1978 |
// must be satisfied by all classes in the dictionary.
|
|
1979 |
// if defining is true, then LinkageError if already in systemDictionary
|
|
1980 |
// if initiating loader, then ok if instanceKlass matches existing entry
|
|
1981 |
|
|
1982 |
void SystemDictionary::check_constraints(int d_index, unsigned int d_hash,
|
|
1983 |
instanceKlassHandle k,
|
|
1984 |
Handle class_loader, bool defining,
|
|
1985 |
TRAPS) {
|
|
1986 |
const char *linkage_error = NULL;
|
|
1987 |
{
|
|
1988 |
symbolHandle name (THREAD, k->name());
|
|
1989 |
MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
1990 |
|
|
1991 |
klassOop check = find_class(d_index, d_hash, name, class_loader);
|
|
1992 |
if (check != (klassOop)NULL) {
|
|
1993 |
// if different instanceKlass - duplicate class definition,
|
|
1994 |
// else - ok, class loaded by a different thread in parallel,
|
|
1995 |
// we should only have found it if it was done loading and ok to use
|
|
1996 |
// system dictionary only holds instance classes, placeholders
|
|
1997 |
// also holds array classes
|
|
1998 |
|
|
1999 |
assert(check->klass_part()->oop_is_instance(), "noninstance in systemdictionary");
|
|
2000 |
if ((defining == true) || (k() != check)) {
|
|
2001 |
linkage_error = "loader (instance of %s): attempted duplicate class "
|
|
2002 |
"definition for name: \"%s\"";
|
|
2003 |
} else {
|
|
2004 |
return;
|
|
2005 |
}
|
|
2006 |
}
|
|
2007 |
|
|
2008 |
#ifdef ASSERT
|
|
2009 |
unsigned int p_hash = placeholders()->compute_hash(name, class_loader);
|
|
2010 |
int p_index = placeholders()->hash_to_index(p_hash);
|
|
2011 |
symbolOop ph_check = find_placeholder(p_index, p_hash, name, class_loader);
|
|
2012 |
assert(ph_check == NULL || ph_check == name(), "invalid symbol");
|
|
2013 |
#endif
|
|
2014 |
|
|
2015 |
if (linkage_error == NULL) {
|
|
2016 |
if (constraints()->check_or_update(k, class_loader, name) == false) {
|
|
2017 |
linkage_error = "loader constraint violation: loader (instance of %s)"
|
|
2018 |
" previously initiated loading for a different type with name \"%s\"";
|
|
2019 |
}
|
|
2020 |
}
|
|
2021 |
}
|
|
2022 |
|
|
2023 |
// Throw error now if needed (cannot throw while holding
|
|
2024 |
// SystemDictionary_lock because of rank ordering)
|
|
2025 |
|
|
2026 |
if (linkage_error) {
|
|
2027 |
ResourceMark rm(THREAD);
|
|
2028 |
const char* class_loader_name = loader_name(class_loader());
|
|
2029 |
char* type_name = k->name()->as_C_string();
|
|
2030 |
size_t buflen = strlen(linkage_error) + strlen(class_loader_name) +
|
|
2031 |
strlen(type_name);
|
|
2032 |
char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
|
|
2033 |
jio_snprintf(buf, buflen, linkage_error, class_loader_name, type_name);
|
|
2034 |
THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
|
|
2035 |
}
|
|
2036 |
}
|
|
2037 |
|
|
2038 |
|
|
2039 |
// Update system dictionary - done after check_constraint and add_to_hierachy
|
|
2040 |
// have been called.
|
|
2041 |
void SystemDictionary::update_dictionary(int d_index, unsigned int d_hash,
|
|
2042 |
int p_index, unsigned int p_hash,
|
|
2043 |
instanceKlassHandle k,
|
|
2044 |
Handle class_loader,
|
|
2045 |
TRAPS) {
|
|
2046 |
// Compile_lock prevents systemDictionary updates during compilations
|
|
2047 |
assert_locked_or_safepoint(Compile_lock);
|
|
2048 |
symbolHandle name (THREAD, k->name());
|
|
2049 |
|
|
2050 |
{
|
|
2051 |
MutexLocker mu1(SystemDictionary_lock, THREAD);
|
|
2052 |
|
|
2053 |
// See whether biased locking is enabled and if so set it for this
|
|
2054 |
// klass.
|
|
2055 |
// Note that this must be done past the last potential blocking
|
|
2056 |
// point / safepoint. We enable biased locking lazily using a
|
|
2057 |
// VM_Operation to iterate the SystemDictionary and installing the
|
|
2058 |
// biasable mark word into each instanceKlass's prototype header.
|
|
2059 |
// To avoid race conditions where we accidentally miss enabling the
|
|
2060 |
// optimization for one class in the process of being added to the
|
|
2061 |
// dictionary, we must not safepoint after the test of
|
|
2062 |
// BiasedLocking::enabled().
|
|
2063 |
if (UseBiasedLocking && BiasedLocking::enabled()) {
|
|
2064 |
// Set biased locking bit for all loaded classes; it will be
|
|
2065 |
// cleared if revocation occurs too often for this type
|
|
2066 |
// NOTE that we must only do this when the class is initally
|
|
2067 |
// defined, not each time it is referenced from a new class loader
|
|
2068 |
if (k->class_loader() == class_loader()) {
|
|
2069 |
k->set_prototype_header(markOopDesc::biased_locking_prototype());
|
|
2070 |
}
|
|
2071 |
}
|
|
2072 |
|
|
2073 |
// Check for a placeholder. If there, remove it and make a
|
|
2074 |
// new system dictionary entry.
|
|
2075 |
placeholders()->find_and_remove(p_index, p_hash, name, class_loader, THREAD);
|
|
2076 |
klassOop sd_check = find_class(d_index, d_hash, name, class_loader);
|
|
2077 |
if (sd_check == NULL) {
|
|
2078 |
dictionary()->add_klass(name, class_loader, k);
|
|
2079 |
notice_modification();
|
|
2080 |
}
|
|
2081 |
#ifdef ASSERT
|
|
2082 |
sd_check = find_class(d_index, d_hash, name, class_loader);
|
|
2083 |
assert (sd_check != NULL, "should have entry in system dictionary");
|
|
2084 |
// Changed to allow PH to remain to complete class circularity checking
|
|
2085 |
// while only one thread can define a class at one time, multiple
|
|
2086 |
// classes can resolve the superclass for a class at one time,
|
|
2087 |
// and the placeholder is used to track that
|
|
2088 |
// symbolOop ph_check = find_placeholder(p_index, p_hash, name, class_loader);
|
|
2089 |
// assert (ph_check == NULL, "should not have a placeholder entry");
|
|
2090 |
#endif
|
|
2091 |
SystemDictionary_lock->notify_all();
|
|
2092 |
}
|
|
2093 |
}
|
|
2094 |
|
|
2095 |
|
|
2096 |
klassOop SystemDictionary::find_constrained_instance_or_array_klass(
|
|
2097 |
symbolHandle class_name, Handle class_loader, TRAPS) {
|
|
2098 |
|
|
2099 |
// First see if it has been loaded directly.
|
|
2100 |
// Force the protection domain to be null. (This removes protection checks.)
|
|
2101 |
Handle no_protection_domain;
|
|
2102 |
klassOop klass = find_instance_or_array_klass(class_name, class_loader,
|
|
2103 |
no_protection_domain, CHECK_NULL);
|
|
2104 |
if (klass != NULL)
|
|
2105 |
return klass;
|
|
2106 |
|
|
2107 |
// Now look to see if it has been loaded elsewhere, and is subject to
|
|
2108 |
// a loader constraint that would require this loader to return the
|
|
2109 |
// klass that is already loaded.
|
|
2110 |
if (FieldType::is_array(class_name())) {
|
|
2111 |
// Array classes are hard because their klassOops are not kept in the
|
|
2112 |
// constraint table. The array klass may be constrained, but the elem class
|
|
2113 |
// may not be.
|
|
2114 |
jint dimension;
|
|
2115 |
symbolOop object_key;
|
|
2116 |
BasicType t = FieldType::get_array_info(class_name(), &dimension,
|
|
2117 |
&object_key, CHECK_(NULL));
|
|
2118 |
if (t != T_OBJECT) {
|
|
2119 |
klass = Universe::typeArrayKlassObj(t);
|
|
2120 |
} else {
|
|
2121 |
symbolHandle elem_name(THREAD, object_key);
|
|
2122 |
MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
2123 |
klass = constraints()->find_constrained_elem_klass(class_name, elem_name, class_loader, THREAD);
|
|
2124 |
}
|
|
2125 |
if (klass != NULL) {
|
|
2126 |
klass = Klass::cast(klass)->array_klass_or_null(dimension);
|
|
2127 |
}
|
|
2128 |
} else {
|
|
2129 |
MutexLocker mu(SystemDictionary_lock, THREAD);
|
|
2130 |
// Non-array classes are easy: simply check the constraint table.
|
|
2131 |
klass = constraints()->find_constrained_klass(class_name, class_loader);
|
|
2132 |
}
|
|
2133 |
|
|
2134 |
return klass;
|
|
2135 |
}
|
|
2136 |
|
|
2137 |
|
|
2138 |
bool SystemDictionary::add_loader_constraint(symbolHandle class_name,
|
|
2139 |
Handle class_loader1,
|
|
2140 |
Handle class_loader2,
|
|
2141 |
Thread* THREAD) {
|
|
2142 |
unsigned int d_hash1 = dictionary()->compute_hash(class_name, class_loader1);
|
|
2143 |
int d_index1 = dictionary()->hash_to_index(d_hash1);
|
|
2144 |
|
|
2145 |
unsigned int d_hash2 = dictionary()->compute_hash(class_name, class_loader2);
|
|
2146 |
int d_index2 = dictionary()->hash_to_index(d_hash2);
|
|
2147 |
|
|
2148 |
{
|
|
2149 |
MutexLocker mu_s(SystemDictionary_lock, THREAD);
|
|
2150 |
|
|
2151 |
// Better never do a GC while we're holding these oops
|
|
2152 |
No_Safepoint_Verifier nosafepoint;
|
|
2153 |
|
|
2154 |
klassOop klass1 = find_class(d_index1, d_hash1, class_name, class_loader1);
|
|
2155 |
klassOop klass2 = find_class(d_index2, d_hash2, class_name, class_loader2);
|
|
2156 |
return constraints()->add_entry(class_name, klass1, class_loader1,
|
|
2157 |
klass2, class_loader2);
|
|
2158 |
}
|
|
2159 |
}
|
|
2160 |
|
|
2161 |
// Add entry to resolution error table to record the error when the first
|
|
2162 |
// attempt to resolve a reference to a class has failed.
|
|
2163 |
void SystemDictionary::add_resolution_error(constantPoolHandle pool, int which, symbolHandle error) {
|
|
2164 |
unsigned int hash = resolution_errors()->compute_hash(pool, which);
|
|
2165 |
int index = resolution_errors()->hash_to_index(hash);
|
|
2166 |
{
|
|
2167 |
MutexLocker ml(SystemDictionary_lock, Thread::current());
|
|
2168 |
resolution_errors()->add_entry(index, hash, pool, which, error);
|
|
2169 |
}
|
|
2170 |
}
|
|
2171 |
|
|
2172 |
// Lookup resolution error table. Returns error if found, otherwise NULL.
|
|
2173 |
symbolOop SystemDictionary::find_resolution_error(constantPoolHandle pool, int which) {
|
|
2174 |
unsigned int hash = resolution_errors()->compute_hash(pool, which);
|
|
2175 |
int index = resolution_errors()->hash_to_index(hash);
|
|
2176 |
{
|
|
2177 |
MutexLocker ml(SystemDictionary_lock, Thread::current());
|
|
2178 |
ResolutionErrorEntry* entry = resolution_errors()->find_entry(index, hash, pool, which);
|
|
2179 |
return (entry != NULL) ? entry->error() : (symbolOop)NULL;
|
|
2180 |
}
|
|
2181 |
}
|
|
2182 |
|
|
2183 |
|
|
2184 |
// Make sure all class components (including arrays) in the given
|
|
2185 |
// signature will be resolved to the same class in both loaders.
|
|
2186 |
// Returns the name of the type that failed a loader constraint check, or
|
|
2187 |
// NULL if no constraint failed. The returned C string needs cleaning up
|
|
2188 |
// with a ResourceMark in the caller
|
|
2189 |
char* SystemDictionary::check_signature_loaders(symbolHandle signature,
|
|
2190 |
Handle loader1, Handle loader2,
|
|
2191 |
bool is_method, TRAPS) {
|
|
2192 |
// Nothing to do if loaders are the same.
|
|
2193 |
if (loader1() == loader2()) {
|
|
2194 |
return NULL;
|
|
2195 |
}
|
|
2196 |
|
|
2197 |
SignatureStream sig_strm(signature, is_method);
|
|
2198 |
while (!sig_strm.is_done()) {
|
|
2199 |
if (sig_strm.is_object()) {
|
|
2200 |
symbolOop s = sig_strm.as_symbol(CHECK_NULL);
|
|
2201 |
symbolHandle sig (THREAD, s);
|
|
2202 |
if (!add_loader_constraint(sig, loader1, loader2, THREAD)) {
|
|
2203 |
return sig()->as_C_string();
|
|
2204 |
}
|
|
2205 |
}
|
|
2206 |
sig_strm.next();
|
|
2207 |
}
|
|
2208 |
return NULL;
|
|
2209 |
}
|
|
2210 |
|
|
2211 |
|
|
2212 |
// Since the identity hash code for symbols changes when the symbols are
|
|
2213 |
// moved from the regular perm gen (hash in the mark word) to the shared
|
|
2214 |
// spaces (hash is the address), the classes loaded into the dictionary
|
|
2215 |
// may be in the wrong buckets.
|
|
2216 |
|
|
2217 |
void SystemDictionary::reorder_dictionary() {
|
|
2218 |
dictionary()->reorder_dictionary();
|
|
2219 |
}
|
|
2220 |
|
|
2221 |
|
|
2222 |
void SystemDictionary::copy_buckets(char** top, char* end) {
|
|
2223 |
dictionary()->copy_buckets(top, end);
|
|
2224 |
}
|
|
2225 |
|
|
2226 |
|
|
2227 |
void SystemDictionary::copy_table(char** top, char* end) {
|
|
2228 |
dictionary()->copy_table(top, end);
|
|
2229 |
}
|
|
2230 |
|
|
2231 |
|
|
2232 |
void SystemDictionary::reverse() {
|
|
2233 |
dictionary()->reverse();
|
|
2234 |
}
|
|
2235 |
|
|
2236 |
int SystemDictionary::number_of_classes() {
|
|
2237 |
return dictionary()->number_of_entries();
|
|
2238 |
}
|
|
2239 |
|
|
2240 |
|
|
2241 |
// ----------------------------------------------------------------------------
|
|
2242 |
#ifndef PRODUCT
|
|
2243 |
|
|
2244 |
void SystemDictionary::print() {
|
|
2245 |
dictionary()->print();
|
|
2246 |
|
|
2247 |
// Placeholders
|
|
2248 |
GCMutexLocker mu(SystemDictionary_lock);
|
|
2249 |
placeholders()->print();
|
|
2250 |
|
|
2251 |
// loader constraints - print under SD_lock
|
|
2252 |
constraints()->print();
|
|
2253 |
}
|
|
2254 |
|
|
2255 |
#endif
|
|
2256 |
|
|
2257 |
void SystemDictionary::verify() {
|
|
2258 |
guarantee(dictionary() != NULL, "Verify of system dictionary failed");
|
|
2259 |
guarantee(constraints() != NULL,
|
|
2260 |
"Verify of loader constraints failed");
|
|
2261 |
guarantee(dictionary()->number_of_entries() >= 0 &&
|
|
2262 |
placeholders()->number_of_entries() >= 0,
|
|
2263 |
"Verify of system dictionary failed");
|
|
2264 |
|
|
2265 |
// Verify dictionary
|
|
2266 |
dictionary()->verify();
|
|
2267 |
|
|
2268 |
GCMutexLocker mu(SystemDictionary_lock);
|
|
2269 |
placeholders()->verify();
|
|
2270 |
|
|
2271 |
// Verify constraint table
|
|
2272 |
guarantee(constraints() != NULL, "Verify of loader constraints failed");
|
|
2273 |
constraints()->verify(dictionary());
|
|
2274 |
}
|
|
2275 |
|
|
2276 |
|
|
2277 |
void SystemDictionary::verify_obj_klass_present(Handle obj,
|
|
2278 |
symbolHandle class_name,
|
|
2279 |
Handle class_loader) {
|
|
2280 |
GCMutexLocker mu(SystemDictionary_lock);
|
|
2281 |
oop probe = find_class_or_placeholder(class_name, class_loader);
|
|
2282 |
if (probe == NULL) {
|
|
2283 |
probe = SystemDictionary::find_shared_class(class_name);
|
|
2284 |
}
|
|
2285 |
guarantee(probe != NULL &&
|
|
2286 |
(!probe->is_klass() || probe == obj()),
|
|
2287 |
"Loaded klasses should be in SystemDictionary");
|
|
2288 |
}
|
|
2289 |
|
|
2290 |
#ifndef PRODUCT
|
|
2291 |
|
|
2292 |
// statistics code
|
|
2293 |
class ClassStatistics: AllStatic {
|
|
2294 |
private:
|
|
2295 |
static int nclasses; // number of classes
|
|
2296 |
static int nmethods; // number of methods
|
|
2297 |
static int nmethoddata; // number of methodData
|
|
2298 |
static int class_size; // size of class objects in words
|
|
2299 |
static int method_size; // size of method objects in words
|
|
2300 |
static int debug_size; // size of debug info in methods
|
|
2301 |
static int methoddata_size; // size of methodData objects in words
|
|
2302 |
|
|
2303 |
static void do_class(klassOop k) {
|
|
2304 |
nclasses++;
|
|
2305 |
class_size += k->size();
|
|
2306 |
if (k->klass_part()->oop_is_instance()) {
|
|
2307 |
instanceKlass* ik = (instanceKlass*)k->klass_part();
|
|
2308 |
class_size += ik->methods()->size();
|
|
2309 |
class_size += ik->constants()->size();
|
|
2310 |
class_size += ik->local_interfaces()->size();
|
|
2311 |
class_size += ik->transitive_interfaces()->size();
|
|
2312 |
// We do not have to count implementors, since we only store one!
|
|
2313 |
class_size += ik->fields()->size();
|
|
2314 |
}
|
|
2315 |
}
|
|
2316 |
|
|
2317 |
static void do_method(methodOop m) {
|
|
2318 |
nmethods++;
|
|
2319 |
method_size += m->size();
|
|
2320 |
// class loader uses same objArray for empty vectors, so don't count these
|
|
2321 |
if (m->exception_table()->length() != 0) method_size += m->exception_table()->size();
|
|
2322 |
if (m->has_stackmap_table()) {
|
|
2323 |
method_size += m->stackmap_data()->size();
|
|
2324 |
}
|
|
2325 |
|
|
2326 |
methodDataOop mdo = m->method_data();
|
|
2327 |
if (mdo != NULL) {
|
|
2328 |
nmethoddata++;
|
|
2329 |
methoddata_size += mdo->size();
|
|
2330 |
}
|
|
2331 |
}
|
|
2332 |
|
|
2333 |
public:
|
|
2334 |
static void print() {
|
|
2335 |
SystemDictionary::classes_do(do_class);
|
|
2336 |
SystemDictionary::methods_do(do_method);
|
|
2337 |
tty->print_cr("Class statistics:");
|
|
2338 |
tty->print_cr("%d classes (%d bytes)", nclasses, class_size * oopSize);
|
|
2339 |
tty->print_cr("%d methods (%d bytes = %d base + %d debug info)", nmethods,
|
|
2340 |
(method_size + debug_size) * oopSize, method_size * oopSize, debug_size * oopSize);
|
|
2341 |
tty->print_cr("%d methoddata (%d bytes)", nmethoddata, methoddata_size * oopSize);
|
|
2342 |
}
|
|
2343 |
};
|
|
2344 |
|
|
2345 |
|
|
2346 |
int ClassStatistics::nclasses = 0;
|
|
2347 |
int ClassStatistics::nmethods = 0;
|
|
2348 |
int ClassStatistics::nmethoddata = 0;
|
|
2349 |
int ClassStatistics::class_size = 0;
|
|
2350 |
int ClassStatistics::method_size = 0;
|
|
2351 |
int ClassStatistics::debug_size = 0;
|
|
2352 |
int ClassStatistics::methoddata_size = 0;
|
|
2353 |
|
|
2354 |
void SystemDictionary::print_class_statistics() {
|
|
2355 |
ResourceMark rm;
|
|
2356 |
ClassStatistics::print();
|
|
2357 |
}
|
|
2358 |
|
|
2359 |
|
|
2360 |
class MethodStatistics: AllStatic {
|
|
2361 |
public:
|
|
2362 |
enum {
|
|
2363 |
max_parameter_size = 10
|
|
2364 |
};
|
|
2365 |
private:
|
|
2366 |
|
|
2367 |
static int _number_of_methods;
|
|
2368 |
static int _number_of_final_methods;
|
|
2369 |
static int _number_of_static_methods;
|
|
2370 |
static int _number_of_native_methods;
|
|
2371 |
static int _number_of_synchronized_methods;
|
|
2372 |
static int _number_of_profiled_methods;
|
|
2373 |
static int _number_of_bytecodes;
|
|
2374 |
static int _parameter_size_profile[max_parameter_size];
|
|
2375 |
static int _bytecodes_profile[Bytecodes::number_of_java_codes];
|
|
2376 |
|
|
2377 |
static void initialize() {
|
|
2378 |
_number_of_methods = 0;
|
|
2379 |
_number_of_final_methods = 0;
|
|
2380 |
_number_of_static_methods = 0;
|
|
2381 |
_number_of_native_methods = 0;
|
|
2382 |
_number_of_synchronized_methods = 0;
|
|
2383 |
_number_of_profiled_methods = 0;
|
|
2384 |
_number_of_bytecodes = 0;
|
|
2385 |
for (int i = 0; i < max_parameter_size ; i++) _parameter_size_profile[i] = 0;
|
|
2386 |
for (int j = 0; j < Bytecodes::number_of_java_codes; j++) _bytecodes_profile [j] = 0;
|
|
2387 |
};
|
|
2388 |
|
|
2389 |
static void do_method(methodOop m) {
|
|
2390 |
_number_of_methods++;
|
|
2391 |
// collect flag info
|
|
2392 |
if (m->is_final() ) _number_of_final_methods++;
|
|
2393 |
if (m->is_static() ) _number_of_static_methods++;
|
|
2394 |
if (m->is_native() ) _number_of_native_methods++;
|
|
2395 |
if (m->is_synchronized()) _number_of_synchronized_methods++;
|
|
2396 |
if (m->method_data() != NULL) _number_of_profiled_methods++;
|
|
2397 |
// collect parameter size info (add one for receiver, if any)
|
|
2398 |
_parameter_size_profile[MIN2(m->size_of_parameters() + (m->is_static() ? 0 : 1), max_parameter_size - 1)]++;
|
|
2399 |
// collect bytecodes info
|
|
2400 |
{
|
|
2401 |
Thread *thread = Thread::current();
|
|
2402 |
HandleMark hm(thread);
|
|
2403 |
BytecodeStream s(methodHandle(thread, m));
|
|
2404 |
Bytecodes::Code c;
|
|
2405 |
while ((c = s.next()) >= 0) {
|
|
2406 |
_number_of_bytecodes++;
|
|
2407 |
_bytecodes_profile[c]++;
|
|
2408 |
}
|
|
2409 |
}
|
|
2410 |
}
|
|
2411 |
|
|
2412 |
public:
|
|
2413 |
static void print() {
|
|
2414 |
initialize();
|
|
2415 |
SystemDictionary::methods_do(do_method);
|
|
2416 |
// generate output
|
|
2417 |
tty->cr();
|
|
2418 |
tty->print_cr("Method statistics (static):");
|
|
2419 |
// flag distribution
|
|
2420 |
tty->cr();
|
|
2421 |
tty->print_cr("%6d final methods %6.1f%%", _number_of_final_methods , _number_of_final_methods * 100.0F / _number_of_methods);
|
|
2422 |
tty->print_cr("%6d static methods %6.1f%%", _number_of_static_methods , _number_of_static_methods * 100.0F / _number_of_methods);
|
|
2423 |
tty->print_cr("%6d native methods %6.1f%%", _number_of_native_methods , _number_of_native_methods * 100.0F / _number_of_methods);
|
|
2424 |
tty->print_cr("%6d synchronized methods %6.1f%%", _number_of_synchronized_methods, _number_of_synchronized_methods * 100.0F / _number_of_methods);
|
|
2425 |
tty->print_cr("%6d profiled methods %6.1f%%", _number_of_profiled_methods, _number_of_profiled_methods * 100.0F / _number_of_methods);
|
|
2426 |
// parameter size profile
|
|
2427 |
tty->cr();
|
|
2428 |
{ int tot = 0;
|
|
2429 |
int avg = 0;
|
|
2430 |
for (int i = 0; i < max_parameter_size; i++) {
|
|
2431 |
int n = _parameter_size_profile[i];
|
|
2432 |
tot += n;
|
|
2433 |
avg += n*i;
|
|
2434 |
tty->print_cr("parameter size = %1d: %6d methods %5.1f%%", i, n, n * 100.0F / _number_of_methods);
|
|
2435 |
}
|
|
2436 |
assert(tot == _number_of_methods, "should be the same");
|
|
2437 |
tty->print_cr(" %6d methods 100.0%%", _number_of_methods);
|
|
2438 |
tty->print_cr("(average parameter size = %3.1f including receiver, if any)", (float)avg / _number_of_methods);
|
|
2439 |
}
|
|
2440 |
// bytecodes profile
|
|
2441 |
tty->cr();
|
|
2442 |
{ int tot = 0;
|
|
2443 |
for (int i = 0; i < Bytecodes::number_of_java_codes; i++) {
|
|
2444 |
if (Bytecodes::is_defined(i)) {
|
|
2445 |
Bytecodes::Code c = Bytecodes::cast(i);
|
|
2446 |
int n = _bytecodes_profile[c];
|
|
2447 |
tot += n;
|
|
2448 |
tty->print_cr("%9d %7.3f%% %s", n, n * 100.0F / _number_of_bytecodes, Bytecodes::name(c));
|
|
2449 |
}
|
|
2450 |
}
|
|
2451 |
assert(tot == _number_of_bytecodes, "should be the same");
|
|
2452 |
tty->print_cr("%9d 100.000%%", _number_of_bytecodes);
|
|
2453 |
}
|
|
2454 |
tty->cr();
|
|
2455 |
}
|
|
2456 |
};
|
|
2457 |
|
|
2458 |
int MethodStatistics::_number_of_methods;
|
|
2459 |
int MethodStatistics::_number_of_final_methods;
|
|
2460 |
int MethodStatistics::_number_of_static_methods;
|
|
2461 |
int MethodStatistics::_number_of_native_methods;
|
|
2462 |
int MethodStatistics::_number_of_synchronized_methods;
|
|
2463 |
int MethodStatistics::_number_of_profiled_methods;
|
|
2464 |
int MethodStatistics::_number_of_bytecodes;
|
|
2465 |
int MethodStatistics::_parameter_size_profile[MethodStatistics::max_parameter_size];
|
|
2466 |
int MethodStatistics::_bytecodes_profile[Bytecodes::number_of_java_codes];
|
|
2467 |
|
|
2468 |
|
|
2469 |
void SystemDictionary::print_method_statistics() {
|
|
2470 |
MethodStatistics::print();
|
|
2471 |
}
|
|
2472 |
|
|
2473 |
#endif // PRODUCT
|