| /* |
| * Copyright (c) 2015, 2023, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "cds/filemap.hpp" |
| #include "classfile/classFileParser.hpp" |
| #include "classfile/classFileStream.hpp" |
| #include "classfile/classLoader.hpp" |
| #include "classfile/classLoaderData.hpp" |
| #include "classfile/classLoaderData.inline.hpp" |
| #include "classfile/classLoadInfo.hpp" |
| #include "classfile/klassFactory.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "prims/jvmtiEnvBase.hpp" |
| #include "prims/jvmtiRedefineClasses.hpp" |
| #include "runtime/arguments.hpp" |
| #include "runtime/handles.inline.hpp" |
| #include "utilities/macros.hpp" |
| #if INCLUDE_JFR |
| #include "jfr/support/jfrKlassExtension.hpp" |
| #endif |
| |
| |
| // called during initial loading of a shared class |
| InstanceKlass* KlassFactory::check_shared_class_file_load_hook( |
| InstanceKlass* ik, |
| Symbol* class_name, |
| Handle class_loader, |
| Handle protection_domain, |
| const ClassFileStream *cfs, |
| TRAPS) { |
| #if INCLUDE_CDS && INCLUDE_JVMTI |
| assert(ik != nullptr, "sanity"); |
| assert(ik->is_shared(), "expecting a shared class"); |
| if (JvmtiExport::should_post_class_file_load_hook()) { |
| ResourceMark rm(THREAD); |
| // Post the CFLH |
| JvmtiCachedClassFileData* cached_class_file = nullptr; |
| if (cfs == nullptr) { |
| cfs = FileMapInfo::open_stream_for_jvmti(ik, class_loader, CHECK_NULL); |
| } |
| unsigned char* ptr = (unsigned char*)cfs->buffer(); |
| unsigned char* end_ptr = ptr + cfs->length(); |
| unsigned char* old_ptr = ptr; |
| JvmtiExport::post_class_file_load_hook(class_name, |
| class_loader, |
| protection_domain, |
| &ptr, |
| &end_ptr, |
| &cached_class_file); |
| if (old_ptr != ptr) { |
| // JVMTI agent has modified class file data. |
| // Set new class file stream using JVMTI agent modified class file data. |
| ClassLoaderData* loader_data = |
| ClassLoaderData::class_loader_data(class_loader()); |
| s2 path_index = ik->shared_classpath_index(); |
| ClassFileStream* stream = new ClassFileStream(ptr, |
| end_ptr - ptr, |
| cfs->source(), |
| ClassFileStream::verify); |
| ClassLoadInfo cl_info(protection_domain); |
| ClassFileParser parser(stream, |
| class_name, |
| loader_data, |
| &cl_info, |
| ClassFileParser::BROADCAST, // publicity level |
| CHECK_NULL); |
| const ClassInstanceInfo* cl_inst_info = cl_info.class_hidden_info_ptr(); |
| InstanceKlass* new_ik = parser.create_instance_klass(true, // changed_by_loadhook |
| *cl_inst_info, // dynamic_nest_host and classData |
| CHECK_NULL); |
| |
| if (cached_class_file != nullptr) { |
| new_ik->set_cached_class_file(cached_class_file); |
| } |
| |
| if (class_loader.is_null()) { |
| new_ik->set_classpath_index(path_index); |
| } |
| |
| return new_ik; |
| } |
| } |
| #endif |
| |
| return nullptr; |
| } |
| |
| |
| static ClassFileStream* check_class_file_load_hook(ClassFileStream* stream, |
| Symbol* name, |
| ClassLoaderData* loader_data, |
| Handle protection_domain, |
| JvmtiCachedClassFileData** cached_class_file, |
| TRAPS) { |
| |
| assert(stream != nullptr, "invariant"); |
| |
| if (JvmtiExport::should_post_class_file_load_hook()) { |
| const JavaThread* jt = THREAD; |
| |
| Handle class_loader(THREAD, loader_data->class_loader()); |
| |
| // Get the cached class file bytes (if any) from the class that |
| // is being retransformed. If class file load hook provides |
| // modified class data during class loading or redefinition, |
| // new cached class file buffer should be allocated. |
| // We use jvmti_thread_state() |
| // instead of JvmtiThreadState::state_for(jt) so we don't allocate |
| // a JvmtiThreadState any earlier than necessary. This will help |
| // avoid the bug described by 7126851. |
| |
| JvmtiThreadState* state = jt->jvmti_thread_state(); |
| |
| if (state != nullptr) { |
| Klass* k = state->get_class_being_redefined(); |
| if (k != nullptr && state->get_class_load_kind() == jvmti_class_load_kind_retransform) { |
| InstanceKlass* class_being_redefined = InstanceKlass::cast(k); |
| *cached_class_file = class_being_redefined->get_cached_class_file(); |
| } |
| } |
| |
| unsigned char* ptr = const_cast<unsigned char*>(stream->buffer()); |
| unsigned char* end_ptr = ptr + stream->length(); |
| |
| JvmtiExport::post_class_file_load_hook(name, |
| class_loader, |
| protection_domain, |
| &ptr, |
| &end_ptr, |
| cached_class_file); |
| |
| if (ptr != stream->buffer()) { |
| // JVMTI agent has modified class file data. |
| // Set new class file stream using JVMTI agent modified class file data. |
| stream = new ClassFileStream(ptr, |
| end_ptr - ptr, |
| stream->source(), |
| stream->need_verify()); |
| } |
| } |
| |
| return stream; |
| } |
| |
| |
| InstanceKlass* KlassFactory::create_from_stream(ClassFileStream* stream, |
| Symbol* name, |
| ClassLoaderData* loader_data, |
| const ClassLoadInfo& cl_info, |
| TRAPS) { |
| assert(stream != nullptr, "invariant"); |
| assert(loader_data != nullptr, "invariant"); |
| |
| ResourceMark rm(THREAD); |
| HandleMark hm(THREAD); |
| |
| JvmtiCachedClassFileData* cached_class_file = nullptr; |
| |
| ClassFileStream* old_stream = stream; |
| |
| // increment counter |
| THREAD->statistical_info().incr_define_class_count(); |
| |
| // Skip this processing for VM hidden classes |
| if (!cl_info.is_hidden()) { |
| stream = check_class_file_load_hook(stream, |
| name, |
| loader_data, |
| cl_info.protection_domain(), |
| &cached_class_file, |
| CHECK_NULL); |
| } |
| |
| ClassFileParser parser(stream, |
| name, |
| loader_data, |
| &cl_info, |
| ClassFileParser::BROADCAST, // publicity level |
| CHECK_NULL); |
| |
| const ClassInstanceInfo* cl_inst_info = cl_info.class_hidden_info_ptr(); |
| InstanceKlass* result = parser.create_instance_klass(old_stream != stream, *cl_inst_info, CHECK_NULL); |
| assert(result != nullptr, "result cannot be null with no pending exception"); |
| |
| if (cached_class_file != nullptr) { |
| // JVMTI: we have an InstanceKlass now, tell it about the cached bytes |
| result->set_cached_class_file(cached_class_file); |
| } |
| |
| JFR_ONLY(ON_KLASS_CREATION(result, parser, THREAD);) |
| |
| #if INCLUDE_CDS |
| if (Arguments::is_dumping_archive()) { |
| ClassLoader::record_result(THREAD, result, stream, old_stream != stream); |
| } |
| #endif // INCLUDE_CDS |
| |
| return result; |
| } |
