author | kvn |
Sun, 11 Dec 2016 19:07:04 -0800 | |
changeset 42650 | 1f304d0c888b |
parent 41739 | 4a4b9f6a4306 |
child 46329 | 53ccc37bda19 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2015, 2016, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "precompiled.hpp" |
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#include "classfile/classFileParser.hpp" |
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#include "classfile/classFileStream.hpp" |
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#include "classfile/classLoader.hpp" |
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#include "classfile/classLoaderData.hpp" |
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#include "classfile/classLoaderData.inline.hpp" |
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#include "classfile/klassFactory.hpp" |
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#include "classfile/sharedClassUtil.hpp" |
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#include "memory/metaspaceShared.hpp" |
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#include "memory/resourceArea.hpp" |
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#include "prims/jvmtiEnvBase.hpp" |
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#include "prims/jvmtiRedefineClasses.hpp" |
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#include "trace/traceMacros.hpp" |
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// called during initial loading of a shared class |
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instanceKlassHandle KlassFactory::check_shared_class_file_load_hook( |
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instanceKlassHandle ik, |
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Symbol* class_name, |
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Handle class_loader, |
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Handle protection_domain, TRAPS) { |
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#if INCLUDE_CDS && INCLUDE_JVMTI |
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assert(ik.not_null(), "sanity"); |
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assert(ik()->is_shared(), "expecting a shared class"); |
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if (JvmtiExport::should_post_class_file_load_hook()) { |
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assert(THREAD->is_Java_thread(), "must be JavaThread"); |
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// Post the CFLH |
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JvmtiCachedClassFileData* cached_class_file = NULL; |
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JvmtiCachedClassFileData* archived_class_data = ik->get_archived_class_data(); |
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assert(archived_class_data != NULL, "shared class has no archived class data"); |
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unsigned char* ptr = |
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VM_RedefineClasses::get_cached_class_file_bytes(archived_class_data); |
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unsigned char* end_ptr = |
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ptr + VM_RedefineClasses::get_cached_class_file_len(archived_class_data); |
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unsigned char* old_ptr = ptr; |
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JvmtiExport::post_class_file_load_hook(class_name, |
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class_loader, |
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protection_domain, |
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&ptr, |
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&end_ptr, |
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&cached_class_file); |
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if (old_ptr != ptr) { |
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// JVMTI agent has modified class file data. |
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// Set new class file stream using JVMTI agent modified class file data. |
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ClassLoaderData* loader_data = |
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ClassLoaderData::class_loader_data(class_loader()); |
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int path_index = ik->shared_classpath_index(); |
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SharedClassPathEntry* ent = |
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(SharedClassPathEntry*)FileMapInfo::shared_classpath(path_index); |
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ClassFileStream* stream = new ClassFileStream(ptr, |
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end_ptr - ptr, |
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ent == NULL ? NULL : ent->_name, |
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ClassFileStream::verify); |
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ClassFileParser parser(stream, |
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class_name, |
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loader_data, |
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protection_domain, |
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NULL, |
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NULL, |
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ClassFileParser::BROADCAST, // publicity level |
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CHECK_NULL); |
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instanceKlassHandle new_ik = parser.create_instance_klass(true /* changed_by_loadhook */, |
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CHECK_NULL); |
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if (cached_class_file != NULL) { |
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new_ik->set_cached_class_file(cached_class_file); |
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} |
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if (class_loader.is_null()) { |
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ResourceMark rm; |
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ClassLoader::add_package(class_name->as_C_string(), path_index, THREAD); |
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} |
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return new_ik; |
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} |
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} |
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#endif |
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return NULL; |
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} |
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static ClassFileStream* check_class_file_load_hook(ClassFileStream* stream, |
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Symbol* name, |
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ClassLoaderData* loader_data, |
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Handle protection_domain, |
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JvmtiCachedClassFileData** cached_class_file, |
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TRAPS) { |
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assert(stream != NULL, "invariant"); |
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if (JvmtiExport::should_post_class_file_load_hook()) { |
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assert(THREAD->is_Java_thread(), "must be a JavaThread"); |
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const JavaThread* jt = (JavaThread*)THREAD; |
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Handle class_loader(THREAD, loader_data->class_loader()); |
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// Get the cached class file bytes (if any) from the class that |
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// is being redefined or retransformed. We use jvmti_thread_state() |
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// instead of JvmtiThreadState::state_for(jt) so we don't allocate |
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// a JvmtiThreadState any earlier than necessary. This will help |
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// avoid the bug described by 7126851. |
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JvmtiThreadState* state = jt->jvmti_thread_state(); |
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if (state != NULL) { |
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KlassHandle* h_class_being_redefined = |
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state->get_class_being_redefined(); |
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if (h_class_being_redefined != NULL) { |
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instanceKlassHandle ikh_class_being_redefined = |
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instanceKlassHandle(THREAD, (*h_class_being_redefined)()); |
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*cached_class_file = ikh_class_being_redefined->get_cached_class_file(); |
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} |
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} |
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unsigned char* ptr = const_cast<unsigned char*>(stream->buffer()); |
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unsigned char* end_ptr = ptr + stream->length(); |
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JvmtiExport::post_class_file_load_hook(name, |
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class_loader, |
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protection_domain, |
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&ptr, |
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&end_ptr, |
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cached_class_file); |
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if (ptr != stream->buffer()) { |
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// JVMTI agent has modified class file data. |
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// Set new class file stream using JVMTI agent modified class file data. |
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stream = new ClassFileStream(ptr, |
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end_ptr - ptr, |
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stream->source(), |
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stream->need_verify()); |
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} |
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} |
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return stream; |
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} |
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instanceKlassHandle KlassFactory::create_from_stream(ClassFileStream* stream, |
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Symbol* name, |
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ClassLoaderData* loader_data, |
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Handle protection_domain, |
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const InstanceKlass* host_klass, |
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GrowableArray<Handle>* cp_patches, |
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TRAPS) { |
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assert(stream != NULL, "invariant"); |
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assert(loader_data != NULL, "invariant"); |
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assert(THREAD->is_Java_thread(), "must be a JavaThread"); |
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ResourceMark rm; |
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HandleMark hm; |
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JvmtiCachedClassFileData* cached_class_file = NULL; |
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ClassFileStream* old_stream = stream; |
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// Skip this processing for VM anonymous classes |
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if (host_klass == NULL) { |
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stream = check_class_file_load_hook(stream, |
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name, |
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loader_data, |
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protection_domain, |
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&cached_class_file, |
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CHECK_NULL); |
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} |
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ClassFileParser parser(stream, |
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name, |
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loader_data, |
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protection_domain, |
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host_klass, |
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cp_patches, |
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ClassFileParser::BROADCAST, // publicity level |
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CHECK_NULL); |
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instanceKlassHandle result = parser.create_instance_klass(old_stream != stream, CHECK_NULL); |
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assert(result == parser.create_instance_klass(old_stream != stream, THREAD), "invariant"); |
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if (result.is_null()) { |
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return NULL; |
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} |
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if (cached_class_file != NULL) { |
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// JVMTI: we have an InstanceKlass now, tell it about the cached bytes |
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result->set_cached_class_file(cached_class_file); |
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} |
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if (InstanceKlass::should_store_fingerprint()) { |
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result->store_fingerprint(!result->is_anonymous() ? stream->compute_fingerprint() : 0); |
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} |
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TRACE_KLASS_CREATION(result, parser, THREAD); |
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#if INCLUDE_CDS && INCLUDE_JVMTI |
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if (DumpSharedSpaces) { |
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assert(cached_class_file == NULL, "Sanity"); |
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// Archive the class stream data into the optional data section |
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JvmtiCachedClassFileData *p; |
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int len; |
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const unsigned char *bytes; |
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// event based tracing might set cached_class_file |
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if ((bytes = result->get_cached_class_file_bytes()) != NULL) { |
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len = result->get_cached_class_file_len(); |
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} else { |
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len = stream->length(); |
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bytes = stream->buffer(); |
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} |
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p = (JvmtiCachedClassFileData*)MetaspaceShared::optional_data_space_alloc( |
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offset_of(JvmtiCachedClassFileData, data) + len); |
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p->length = len; |
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memcpy(p->data, bytes, len); |
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result->set_archived_class_data(p); |
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} |
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#endif |
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return result; |
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} |