Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "jfr/jni/jfrJavaSupport.hpp"

 #include "jfr/recorder/checkpoint/jfrMetadataEvent.hpp"

 #include "jfr/recorder/repository/jfrChunkWriter.hpp"

 #include "oops/klass.inline.hpp"

 #include "oops/oop.inline.hpp"

 #include "oops/typeArrayOop.hpp"

 #include "runtime/semaphore.hpp"

 #include "runtime/thread.inline.hpp"

 static jbyteArray _metadata_blob = NULL;

 static Semaphore metadata_mutex_semaphore(1);

 void JfrMetadataEvent::lock() {

   metadata_mutex_semaphore.wait();

 }

 void JfrMetadataEvent::unlock() {

   metadata_mutex_semaphore.signal();

 }

 static void write_metadata_blob(JfrChunkWriter& chunkwriter, jbyteArray metadata_blob) {

   if (metadata_blob != NULL) {

     const typeArrayOop arr = (typeArrayOop)JfrJavaSupport::resolve_non_null(metadata_blob);

     assert(arr != NULL, "invariant");

     const int length = arr->length();

     Klass* const k = arr->klass();

     assert(k != NULL && k->oop_is_array(), "invariant");

     const TypeArrayKlass* const byte_arr_klass = TypeArrayKlass::cast(k);

     const jbyte* const data_address = arr->byte_at_addr(0);

     chunkwriter.write_unbuffered(data_address, length);

   }

 }

 // the semaphore is assumed to be locked  (was locked previous safepoint)

 size_t JfrMetadataEvent::write(JfrChunkWriter& chunkwriter, jlong metadata_offset) {

   assert(chunkwriter.is_valid(), "invariant");

   assert(chunkwriter.current_offset() == metadata_offset, "invariant");

   // header

   chunkwriter.reserve(sizeof(u4));

   chunkwriter.write<u8>(EVENT_METADATA); // ID 0

   // time data

   chunkwriter.write(JfrTicks::now());

   chunkwriter.write((u8)0); // duration

   chunkwriter.write((u8)0); // metadata id

   write_metadata_blob(chunkwriter, _metadata_blob); // payload

   unlock(); // open up for java to provide updated metadata

   // fill in size of metadata descriptor event

   const jlong size_written = chunkwriter.current_offset() - metadata_offset;

   chunkwriter.write_padded_at_offset((u4)size_written, metadata_offset);

   return size_written;

 }

 void JfrMetadataEvent::update(jbyteArray metadata) {

   JavaThread* thread = (JavaThread*)Thread::current();

   assert(thread->is_Java_thread(), "invariant");

   DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(thread));

   lock();

   if (_metadata_blob != NULL) {

     JfrJavaSupport::destroy_global_jni_handle(_metadata_blob);

   }

   const oop new_desc_oop = JfrJavaSupport::resolve_non_null(metadata);

   _metadata_blob = new_desc_oop != NULL ? (jbyteArray)JfrJavaSupport::global_jni_handle(new_desc_oop, thread) : NULL;

   unlock();

 }