--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/jfr/recorder/checkpoint/jfrCheckpointWriter.cpp Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,185 @@
+/*
+ * 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/recorder/checkpoint/jfrCheckpointManager.hpp"
+#include "jfr/recorder/checkpoint/jfrCheckpointWriter.hpp"
+#include "jfr/writers/jfrBigEndianWriter.hpp"
+
+JfrCheckpointFlush::JfrCheckpointFlush(Type* old, size_t used, size_t requested, Thread* t) :
+ _result(JfrCheckpointManager::flush(old, used, requested, t)) {}
+
+JfrCheckpointWriter::JfrCheckpointWriter(bool flushpoint, bool header, Thread* thread) :
+ JfrCheckpointWriterBase(JfrCheckpointManager::lease_buffer(thread), thread),
+ _time(JfrTicks::now()),
+ _offset(0),
+ _count(0),
+ _flushpoint(flushpoint),
+ _header(header) {
+ assert(this->is_acquired(), "invariant");
+ assert(0 == this->current_offset(), "invariant");
+ if (_header) {
+ reserve(sizeof(JfrCheckpointEntry));
+ }
+}
+
+static void write_checkpoint_header(u1* pos, jlong size, jlong time, bool flushpoint, juint type_count) {
+ assert(pos != NULL, "invariant");
+ JfrBigEndianWriter be_writer(pos, sizeof(JfrCheckpointEntry));
+ be_writer.write(size);
+ be_writer.write(time);
+ be_writer.write(JfrTicks::now().value() - time);
+ be_writer.write(flushpoint ? (juint)1 : (juint)0);
+ be_writer.write(type_count);
+ assert(be_writer.is_valid(), "invariant");
+}
+
+JfrCheckpointWriter::~JfrCheckpointWriter() {
+ assert(this->is_acquired(), "invariant");
+ if (!this->is_valid() || !_header) {
+ release();
+ return;
+ }
+ if (0 == count()) {
+ assert(this->used_size() == sizeof(JfrCheckpointEntry), "invariant");
+ this->seek(_offset);
+ release();
+ return;
+ }
+ assert(_header, "invariant");
+ assert(this->is_valid(), "invariant");
+ assert(count() > 0, "invariant");
+ assert(this->used_size() > sizeof(JfrCheckpointEntry), "invariant");
+ const jlong size = this->current_offset();
+ assert(size + this->start_pos() == this->current_pos(), "invariant");
+ write_checkpoint_header(const_cast<u1*>(this->start_pos()), size, _time, is_flushpoint(), count());
+ release();
+}
+
+void JfrCheckpointWriter::set_flushpoint(bool flushpoint) {
+ _flushpoint = flushpoint;
+}
+
+bool JfrCheckpointWriter::is_flushpoint() const {
+ return _flushpoint;
+}
+
+juint JfrCheckpointWriter::count() const {
+ return _count;
+}
+
+void JfrCheckpointWriter::set_count(juint count) {
+ _count = count;
+}
+
+void JfrCheckpointWriter::release() {
+ assert(this->is_acquired(), "invariant");
+ if (!this->is_valid() || this->used_size() == 0) {
+ return;
+ }
+ assert(this->used_size() > 0, "invariant");
+ // write through to backing storage
+ this->commit();
+ assert(0 == this->current_offset(), "invariant");
+}
+
+void JfrCheckpointWriter::write_type(JfrTypeId type_id) {
+ assert(type_id < TYPES_END, "invariant");
+ write<u8>(type_id);
+ increment();
+}
+
+void JfrCheckpointWriter::write_key(u8 key) {
+ write<u8>(key);
+}
+
+void JfrCheckpointWriter::increment() {
+ ++_count;
+}
+
+void JfrCheckpointWriter::write_count(u4 nof_entries) {
+ write<u4>((u4)nof_entries);
+}
+
+void JfrCheckpointWriter::write_count(u4 nof_entries, jlong offset) {
+ write_padded_at_offset(nof_entries, offset);
+}
+
+const u1* JfrCheckpointWriter::session_data(size_t* size, const JfrCheckpointContext* ctx /* 0 */) {
+ assert(this->is_acquired(), "wrong state!");
+ if (!this->is_valid()) {
+ *size = 0;
+ return NULL;
+ }
+ if (ctx != NULL) {
+ const u1* session_start_pos = this->start_pos() + ctx->offset;
+ *size = this->current_pos() - session_start_pos;
+ return session_start_pos;
+ }
+ *size = this->used_size();
+ assert(this->start_pos() + *size == this->current_pos(), "invariant");
+ write_checkpoint_header(const_cast<u1*>(this->start_pos()), this->used_offset(), _time, is_flushpoint(), count());
+ this->seek(_offset + (_header ? sizeof(JfrCheckpointEntry) : 0));
+ set_count(0);
+ return this->start_pos();
+}
+
+const JfrCheckpointContext JfrCheckpointWriter::context() const {
+ JfrCheckpointContext ctx;
+ ctx.offset = this->current_offset();
+ ctx.count = this->count();
+ return ctx;
+}
+
+void JfrCheckpointWriter::set_context(const JfrCheckpointContext ctx) {
+ this->seek(ctx.offset);
+ set_count(ctx.count);
+}
+bool JfrCheckpointWriter::has_data() const {
+ return this->used_size() > sizeof(JfrCheckpointEntry);
+}
+
+JfrCheckpointBlobHandle JfrCheckpointWriter::checkpoint_blob() {
+ size_t size = 0;
+ const u1* data = session_data(&size);
+ return JfrCheckpointBlob::make(data, size);
+}
+
+JfrCheckpointBlobHandle JfrCheckpointWriter::copy(const JfrCheckpointContext* ctx /* 0 */) {
+ if (ctx == NULL) {
+ return checkpoint_blob();
+ }
+ size_t size = 0;
+ const u1* data = session_data(&size, ctx);
+ return JfrCheckpointBlob::make(data, size);
+}
+
+JfrCheckpointBlobHandle JfrCheckpointWriter::move(const JfrCheckpointContext* ctx /* 0 */) {
+ JfrCheckpointBlobHandle data = copy(ctx);
+ if (ctx != NULL) {
+ const_cast<JfrCheckpointContext*>(ctx)->count = 0;
+ set_context(*ctx);
+ }
+ return data;
+}