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/*
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* Copyright (c) 2016, 2018, 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 "jfr/jni/jfrJavaSupport.hpp"
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#include "jfr/recorder/checkpoint/jfrMetadataEvent.hpp"
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#include "jfr/recorder/repository/jfrChunkWriter.hpp"
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#include "oops/klass.inline.hpp"
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#include "oops/oop.inline.hpp"
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#include "oops/typeArrayOop.inline.hpp"
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#include "runtime/semaphore.hpp"
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#include "runtime/thread.inline.hpp"
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static jbyteArray _metadata_blob = NULL;
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static Semaphore metadata_mutex_semaphore(1);
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void JfrMetadataEvent::lock() {
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metadata_mutex_semaphore.wait();
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}
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void JfrMetadataEvent::unlock() {
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metadata_mutex_semaphore.signal();
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}
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static void write_metadata_blob(JfrChunkWriter& chunkwriter, jbyteArray metadata_blob) {
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if (metadata_blob != NULL) {
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const typeArrayOop arr = (typeArrayOop)JfrJavaSupport::resolve_non_null(metadata_blob);
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assert(arr != NULL, "invariant");
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const int length = arr->length();
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const Klass* const k = arr->klass();
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assert(k != NULL && k->is_array_klass(), "invariant");
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const TypeArrayKlass* const byte_arr_klass = TypeArrayKlass::cast(k);
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const jbyte* const data_address = arr->byte_at_addr(0);
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chunkwriter.write_unbuffered(data_address, length);
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}
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}
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// the semaphore is assumed to be locked (was locked previous safepoint)
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size_t JfrMetadataEvent::write(JfrChunkWriter& chunkwriter, jlong metadata_offset) {
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assert(chunkwriter.is_valid(), "invariant");
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assert(chunkwriter.current_offset() == metadata_offset, "invariant");
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// header
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chunkwriter.reserve(sizeof(u4));
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chunkwriter.write<u8>(EVENT_METADATA); // ID 0
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// time data
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chunkwriter.write(JfrTicks::now());
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chunkwriter.write((u8)0); // duration
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chunkwriter.write((u8)0); // metadata id
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write_metadata_blob(chunkwriter, _metadata_blob); // payload
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unlock(); // open up for java to provide updated metadata
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// fill in size of metadata descriptor event
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const jlong size_written = chunkwriter.current_offset() - metadata_offset;
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chunkwriter.write_padded_at_offset((u4)size_written, metadata_offset);
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return size_written;
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}
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void JfrMetadataEvent::update(jbyteArray metadata) {
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JavaThread* thread = (JavaThread*)Thread::current();
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assert(thread->is_Java_thread(), "invariant");
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DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(thread));
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lock();
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if (_metadata_blob != NULL) {
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JfrJavaSupport::destroy_global_jni_handle(_metadata_blob);
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}
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const oop new_desc_oop = JfrJavaSupport::resolve_non_null(metadata);
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_metadata_blob = new_desc_oop != NULL ? (jbyteArray)JfrJavaSupport::global_jni_handle(new_desc_oop, thread) : NULL;
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unlock();
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}
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