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115 lines
4.1 KiB
C++
115 lines
4.1 KiB
C++
/*
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* Copyright (c) 2024, 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 "cds/aotStreamedHeapLoader.hpp"
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#include "cds/aotThread.hpp"
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#include "cds/heapShared.hpp"
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#include "classfile/javaClasses.hpp"
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#include "classfile/javaThreadStatus.hpp"
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#include "classfile/vmClasses.hpp"
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#include "classfile/vmSymbols.hpp"
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#include "jfr/jfr.hpp"
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#include "runtime/javaThread.inline.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "runtime/osThread.hpp"
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#include "runtime/thread.hpp"
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#include "runtime/threads.hpp"
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#include "utilities/exceptions.hpp"
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AOTThread* AOTThread::_aot_thread;
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bool AOTThread::_started;
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// Starting the AOTThread is tricky. We wish to start it as early as possible, as
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// that increases the amount of curling this thread can do for the application thread
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// that is concurrently starting. But there are complications starting a thread this
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// early. The java.lang.Thread class is not initialized and we may not execute any
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// Java bytecodes yet. This is an internal thread, so we try to keep the bookkeeping
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// minimal and use a logical ThreadIdentifier for JFR and monitor identity. The real
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// thread object is created just after the main thread creates its Thread object, after
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// the Thread class has been initialized.
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void AOTThread::initialize() {
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#if INCLUDE_CDS_JAVA_HEAP
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EXCEPTION_MARK;
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// Spin up a thread without thread oop, because the java.lang classes
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// have not yet been initialized, and hence we can't allocate the Thread
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// object yet.
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AOTThread* thread = new AOTThread(&aot_thread_entry);
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_aot_thread = thread;
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#if INCLUDE_JVMTI
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// The line below hides JVMTI events from this thread (cf. should_hide_jvmti_events())
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// This is important because this thread runs before JVMTI monitors are set up appropriately.
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// Therefore, callbacks would not work as intended. JVMTI has no business peeking at how we
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// materialize primordial objects from the AOT cache.
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thread->disable_jvmti_events();
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#endif
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JavaThread::vm_exit_on_osthread_failure(thread);
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_started = true;
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// Note that the Thread class is not initialized yet at this point. We
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// can run a bit concurrently until the Thread class is initialized; then
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// materialize_thread_object is called to inflate the thread object.
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// The thread needs an identifier. This thread is fine with a temporary ID
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// assignment; it will terminate soon anyway.
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int64_t tid = ThreadIdentifier::next();
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thread->set_monitor_owner_id(tid);
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{
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MutexLocker mu(THREAD, Threads_lock);
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Threads::add(thread);
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}
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JFR_ONLY(Jfr::on_java_thread_start(THREAD, thread);)
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os::start_thread(thread);
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#endif
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}
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void AOTThread::materialize_thread_object() {
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#if INCLUDE_CDS_JAVA_HEAP
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if (!_started) {
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// No thread object to materialize
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return;
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}
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EXCEPTION_MARK;
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HandleMark hm(THREAD);
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Handle thread_oop = JavaThread::create_system_thread_object("AOTThread", CHECK);
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java_lang_Thread::release_set_thread(thread_oop(), _aot_thread);
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_aot_thread->set_threadOopHandles(thread_oop());
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#endif
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}
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void AOTThread::aot_thread_entry(JavaThread* jt, TRAPS) {
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#if INCLUDE_CDS_JAVA_HEAP
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AOTStreamedHeapLoader::materialize_objects();
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_aot_thread = nullptr; // AOT thread will get destroyed after this point
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#endif
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}
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