258 lines
10 KiB
C++
258 lines
10 KiB
C++
/*
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* Copyright (c) 2015, 2017, 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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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, 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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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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const char* pathname;
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if (path_index < 0) {
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// shared classes loaded by user defined class loader
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// do not have shared_classpath_index
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ModuleEntry* mod_entry = ik->module();
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if (mod_entry != NULL && (mod_entry->location() != NULL)) {
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ResourceMark rm;
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pathname = (const char*)(mod_entry->location()->as_C_string());
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} else {
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pathname = "";
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}
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} else {
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SharedClassPathEntry* ent =
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(SharedClassPathEntry*)FileMapInfo::shared_classpath(path_index);
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pathname = ent == NULL ? NULL : ent->name();
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}
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ClassFileStream* stream = new ClassFileStream(ptr,
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end_ptr - ptr,
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pathname,
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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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InstanceKlass* 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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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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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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InstanceKlass* 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 == 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
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if (DumpSharedSpaces) {
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ClassLoader::record_shared_class_loader_type(result, stream);
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#if INCLUDE_JVMTI
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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*)os::malloc(offset_of(JvmtiCachedClassFileData, data) + len, mtInternal);
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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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#endif // INCLUDE_JVMTI
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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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