/* * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "precompiled.hpp" #include "classfile/classFileParser.hpp" #include "classfile/classFileStream.hpp" #include "classfile/classLoader.hpp" #include "classfile/classLoaderData.hpp" #include "classfile/classLoaderData.inline.hpp" #include "classfile/klassFactory.hpp" #include "classfile/sharedClassUtil.hpp" #include "memory/metaspaceShared.hpp" #include "memory/resourceArea.hpp" #include "prims/jvmtiEnvBase.hpp" #include "prims/jvmtiRedefineClasses.hpp" #include "trace/traceMacros.hpp" // called during initial loading of a shared class instanceKlassHandle KlassFactory::check_shared_class_file_load_hook( instanceKlassHandle ik, Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS) { #if INCLUDE_CDS && INCLUDE_JVMTI assert(ik.not_null(), "sanity"); assert(ik()->is_shared(), "expecting a shared class"); if (JvmtiExport::should_post_class_file_load_hook()) { assert(THREAD->is_Java_thread(), "must be JavaThread"); // Post the CFLH JvmtiCachedClassFileData* cached_class_file = NULL; JvmtiCachedClassFileData* archived_class_data = ik->get_archived_class_data(); assert(archived_class_data != NULL, "shared class has no archived class data"); unsigned char* ptr = VM_RedefineClasses::get_cached_class_file_bytes(archived_class_data); unsigned char* end_ptr = ptr + VM_RedefineClasses::get_cached_class_file_len(archived_class_data); 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()); int path_index = ik->shared_classpath_index(); SharedClassPathEntry* ent = (SharedClassPathEntry*)FileMapInfo::shared_classpath(path_index); ClassFileStream* stream = new ClassFileStream(ptr, end_ptr - ptr, ent == NULL ? NULL : ent->_name, ClassFileStream::verify); ClassFileParser parser(stream, class_name, loader_data, protection_domain, NULL, NULL, ClassFileParser::BROADCAST, // publicity level CHECK_NULL); instanceKlassHandle new_ik = parser.create_instance_klass(true /* changed_by_loadhook */, CHECK_NULL); if (cached_class_file != NULL) { new_ik->set_cached_class_file(cached_class_file); } if (class_loader.is_null()) { ResourceMark rm; ClassLoader::add_package(class_name->as_C_string(), path_index, THREAD); } return new_ik; } } #endif return NULL; } static ClassFileStream* check_class_file_load_hook(ClassFileStream* stream, Symbol* name, ClassLoaderData* loader_data, Handle protection_domain, JvmtiCachedClassFileData** cached_class_file, TRAPS) { assert(stream != NULL, "invariant"); if (JvmtiExport::should_post_class_file_load_hook()) { assert(THREAD->is_Java_thread(), "must be a JavaThread"); const JavaThread* jt = (JavaThread*)THREAD; Handle class_loader(THREAD, loader_data->class_loader()); // Get the cached class file bytes (if any) from the class that // is being redefined or retransformed. 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 != NULL) { KlassHandle* h_class_being_redefined = state->get_class_being_redefined(); if (h_class_being_redefined != NULL) { instanceKlassHandle ikh_class_being_redefined = instanceKlassHandle(THREAD, (*h_class_being_redefined)()); *cached_class_file = ikh_class_being_redefined->get_cached_class_file(); } } unsigned char* ptr = const_cast(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; } instanceKlassHandle KlassFactory::create_from_stream(ClassFileStream* stream, Symbol* name, ClassLoaderData* loader_data, Handle protection_domain, const InstanceKlass* host_klass, GrowableArray* cp_patches, TRAPS) { assert(stream != NULL, "invariant"); assert(loader_data != NULL, "invariant"); assert(THREAD->is_Java_thread(), "must be a JavaThread"); ResourceMark rm; HandleMark hm; JvmtiCachedClassFileData* cached_class_file = NULL; ClassFileStream* old_stream = stream; // Skip this processing for VM anonymous classes if (host_klass == NULL) { stream = check_class_file_load_hook(stream, name, loader_data, protection_domain, &cached_class_file, CHECK_NULL); } ClassFileParser parser(stream, name, loader_data, protection_domain, host_klass, cp_patches, ClassFileParser::BROADCAST, // publicity level CHECK_NULL); instanceKlassHandle result = parser.create_instance_klass(old_stream != stream, CHECK_NULL); assert(result == parser.create_instance_klass(old_stream != stream, THREAD), "invariant"); if (result.is_null()) { return NULL; } if (cached_class_file != NULL) { // JVMTI: we have an InstanceKlass now, tell it about the cached bytes result->set_cached_class_file(cached_class_file); } if (InstanceKlass::should_store_fingerprint()) { result->store_fingerprint(!result->is_anonymous() ? stream->compute_fingerprint() : 0); } TRACE_KLASS_CREATION(result, parser, THREAD); #if INCLUDE_CDS && INCLUDE_JVMTI if (DumpSharedSpaces) { assert(cached_class_file == NULL, "Sanity"); // Archive the class stream data into the optional data section JvmtiCachedClassFileData *p; int len; const unsigned char *bytes; // event based tracing might set cached_class_file if ((bytes = result->get_cached_class_file_bytes()) != NULL) { len = result->get_cached_class_file_len(); } else { len = stream->length(); bytes = stream->buffer(); } p = (JvmtiCachedClassFileData*)MetaspaceShared::optional_data_space_alloc( offset_of(JvmtiCachedClassFileData, data) + len); p->length = len; memcpy(p->data, bytes, len); result->set_archived_class_data(p); } #endif return result; }