1 /*
 2  * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
 3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 4  *
 5  * This code is free software; you can redistribute it and/or modify it
 6  * under the terms of the GNU General Public License version 2 only, as
 7  * published by the Free Software Foundation.
 8  *
 9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
21  * questions.
22  *
23  */
24 
25 #include "precompiled.hpp"
26 #include "jfr/jni/jfrJavaSupport.hpp"
27 #include "jfr/recorder/checkpoint/types/jfrTypeManager.hpp"
28 #include "jfr/support/jfrIntrinsics.hpp"
29 #include "jfr/support/jfrJavaThread.hpp"
30 #include "jfr/writers/jfrJavaEventWriter.hpp"
31 #include "runtime/interfaceSupport.inline.hpp"
32 #include "utilities/macros.hpp"
33 
34 static jobject get_event_writer_impl(JavaThread* t, traceid tid, bool write_checkpoint) {
35   assert(t != NULL, "invariant");
36   DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_java(t);)
37   assert(t->has_last_Java_frame(), "invariant");
38   // can safepoint here
39   ThreadInVMfromJava transition(t);
40   if (write_checkpoint) {
41     assert(tid != 0, "only for virtual threads");
42     JfrTypeManager::write_checkpoint(t, tid, JfrJavaThread::virtual_thread(t));
43   }
44   return JfrJavaEventWriter::event_writer(t, tid);
45 }
46 
47 void* JfrIntrinsicSupport::get_event_writer(JavaThread* t) {
48   return get_event_writer_impl(t, 0, false);
49 }
50 
51 void* JfrIntrinsicSupport::write_checkpoint(JavaThread* t, traceid tid) {
52   return get_event_writer_impl(t, tid, true);
53 }