229 lines
8.8 KiB
C++
229 lines
8.8 KiB
C++
/*
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* Copyright (c) 2015, 2020, 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/classLoadInfo.hpp"
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#include "classfile/klassFactory.hpp"
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#include "memory/filemap.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 "runtime/arguments.hpp"
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#include "runtime/handles.inline.hpp"
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#include "utilities/macros.hpp"
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#if INCLUDE_JFR
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#include "jfr/support/jfrKlassExtension.hpp"
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#endif
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// called during initial loading of a shared class
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InstanceKlass* KlassFactory::check_shared_class_file_load_hook(
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InstanceKlass* ik,
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Symbol* class_name,
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Handle class_loader,
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Handle protection_domain,
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const ClassFileStream *cfs,
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TRAPS) {
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#if INCLUDE_CDS && INCLUDE_JVMTI
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assert(ik != 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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if (cfs == NULL) {
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cfs = FileMapInfo::open_stream_for_jvmti(ik, class_loader, CHECK_NULL);
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}
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unsigned char* ptr = (unsigned char*)cfs->buffer();
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unsigned char* end_ptr = ptr + cfs->length();
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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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ClassFileStream* stream = new ClassFileStream(ptr,
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end_ptr - ptr,
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cfs->source(),
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ClassFileStream::verify);
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ClassLoadInfo cl_info(protection_domain);
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ClassFileParser parser(stream,
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class_name,
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loader_data,
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&cl_info,
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ClassFileParser::BROADCAST, // publicity level
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CHECK_NULL);
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const ClassInstanceInfo* cl_inst_info = cl_info.class_hidden_info_ptr();
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InstanceKlass* new_ik = parser.create_instance_klass(true, // changed_by_loadhook
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*cl_inst_info, // dynamic_nest_host and classData
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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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new_ik->set_classpath_index(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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const JavaThread* jt = THREAD->as_Java_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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Klass* k = state->get_class_being_redefined();
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if (k != NULL) {
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InstanceKlass* class_being_redefined = InstanceKlass::cast(k);
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*cached_class_file = 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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InstanceKlass* KlassFactory::create_from_stream(ClassFileStream* stream,
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Symbol* name,
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ClassLoaderData* loader_data,
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const ClassLoadInfo& cl_info,
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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(THREAD);
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HandleMark hm(THREAD);
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JvmtiCachedClassFileData* cached_class_file = NULL;
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ClassFileStream* old_stream = stream;
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// increment counter
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THREAD->statistical_info().incr_define_class_count();
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assert(!(cl_info.is_hidden() && (cl_info.unsafe_anonymous_host() != NULL)),
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"hidden class has an anonymous host");
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// Skip this processing for VM hidden or anonymous classes
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if (!cl_info.is_hidden() && (cl_info.unsafe_anonymous_host() == 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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cl_info.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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&cl_info,
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ClassFileParser::BROADCAST, // publicity level
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CHECK_NULL);
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const ClassInstanceInfo* cl_inst_info = cl_info.class_hidden_info_ptr();
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InstanceKlass* result = parser.create_instance_klass(old_stream != stream, *cl_inst_info, CHECK_NULL);
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if (result == 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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JFR_ONLY(ON_KLASS_CREATION(result, parser, THREAD);)
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#if INCLUDE_CDS
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if (Arguments::is_dumping_archive()) {
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ClassLoader::record_result(result, stream, THREAD);
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}
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#endif // INCLUDE_CDS
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return result;
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}
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