1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/jfr/recorder/checkpoint/jfrCheckpointWriter.cpp Mon Aug 12 18:30:40 2019 +0300
1.3 @@ -0,0 +1,185 @@
1.4 +/*
1.5 + * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "jfr/recorder/checkpoint/jfrCheckpointManager.hpp"
1.30 +#include "jfr/recorder/checkpoint/jfrCheckpointWriter.hpp"
1.31 +#include "jfr/writers/jfrBigEndianWriter.hpp"
1.32 +
1.33 +JfrCheckpointFlush::JfrCheckpointFlush(Type* old, size_t used, size_t requested, Thread* t) :
1.34 + _result(JfrCheckpointManager::flush(old, used, requested, t)) {}
1.35 +
1.36 +JfrCheckpointWriter::JfrCheckpointWriter(bool flushpoint, bool header, Thread* thread) :
1.37 + JfrCheckpointWriterBase(JfrCheckpointManager::lease_buffer(thread), thread),
1.38 + _time(JfrTicks::now()),
1.39 + _offset(0),
1.40 + _count(0),
1.41 + _flushpoint(flushpoint),
1.42 + _header(header) {
1.43 + assert(this->is_acquired(), "invariant");
1.44 + assert(0 == this->current_offset(), "invariant");
1.45 + if (_header) {
1.46 + reserve(sizeof(JfrCheckpointEntry));
1.47 + }
1.48 +}
1.49 +
1.50 +static void write_checkpoint_header(u1* pos, jlong size, jlong time, bool flushpoint, juint type_count) {
1.51 + assert(pos != NULL, "invariant");
1.52 + JfrBigEndianWriter be_writer(pos, sizeof(JfrCheckpointEntry));
1.53 + be_writer.write(size);
1.54 + be_writer.write(time);
1.55 + be_writer.write(JfrTicks::now().value() - time);
1.56 + be_writer.write(flushpoint ? (juint)1 : (juint)0);
1.57 + be_writer.write(type_count);
1.58 + assert(be_writer.is_valid(), "invariant");
1.59 +}
1.60 +
1.61 +JfrCheckpointWriter::~JfrCheckpointWriter() {
1.62 + assert(this->is_acquired(), "invariant");
1.63 + if (!this->is_valid() || !_header) {
1.64 + release();
1.65 + return;
1.66 + }
1.67 + if (0 == count()) {
1.68 + assert(this->used_size() == sizeof(JfrCheckpointEntry), "invariant");
1.69 + this->seek(_offset);
1.70 + release();
1.71 + return;
1.72 + }
1.73 + assert(_header, "invariant");
1.74 + assert(this->is_valid(), "invariant");
1.75 + assert(count() > 0, "invariant");
1.76 + assert(this->used_size() > sizeof(JfrCheckpointEntry), "invariant");
1.77 + const jlong size = this->current_offset();
1.78 + assert(size + this->start_pos() == this->current_pos(), "invariant");
1.79 + write_checkpoint_header(const_cast<u1*>(this->start_pos()), size, _time, is_flushpoint(), count());
1.80 + release();
1.81 +}
1.82 +
1.83 +void JfrCheckpointWriter::set_flushpoint(bool flushpoint) {
1.84 + _flushpoint = flushpoint;
1.85 +}
1.86 +
1.87 +bool JfrCheckpointWriter::is_flushpoint() const {
1.88 + return _flushpoint;
1.89 +}
1.90 +
1.91 +juint JfrCheckpointWriter::count() const {
1.92 + return _count;
1.93 +}
1.94 +
1.95 +void JfrCheckpointWriter::set_count(juint count) {
1.96 + _count = count;
1.97 +}
1.98 +
1.99 +void JfrCheckpointWriter::release() {
1.100 + assert(this->is_acquired(), "invariant");
1.101 + if (!this->is_valid() || this->used_size() == 0) {
1.102 + return;
1.103 + }
1.104 + assert(this->used_size() > 0, "invariant");
1.105 + // write through to backing storage
1.106 + this->commit();
1.107 + assert(0 == this->current_offset(), "invariant");
1.108 +}
1.109 +
1.110 +void JfrCheckpointWriter::write_type(JfrTypeId type_id) {
1.111 + assert(type_id < TYPES_END, "invariant");
1.112 + write<u8>(type_id);
1.113 + increment();
1.114 +}
1.115 +
1.116 +void JfrCheckpointWriter::write_key(u8 key) {
1.117 + write<u8>(key);
1.118 +}
1.119 +
1.120 +void JfrCheckpointWriter::increment() {
1.121 + ++_count;
1.122 +}
1.123 +
1.124 +void JfrCheckpointWriter::write_count(u4 nof_entries) {
1.125 + write<u4>((u4)nof_entries);
1.126 +}
1.127 +
1.128 +void JfrCheckpointWriter::write_count(u4 nof_entries, jlong offset) {
1.129 + write_padded_at_offset(nof_entries, offset);
1.130 +}
1.131 +
1.132 +const u1* JfrCheckpointWriter::session_data(size_t* size, const JfrCheckpointContext* ctx /* 0 */) {
1.133 + assert(this->is_acquired(), "wrong state!");
1.134 + if (!this->is_valid()) {
1.135 + *size = 0;
1.136 + return NULL;
1.137 + }
1.138 + if (ctx != NULL) {
1.139 + const u1* session_start_pos = this->start_pos() + ctx->offset;
1.140 + *size = this->current_pos() - session_start_pos;
1.141 + return session_start_pos;
1.142 + }
1.143 + *size = this->used_size();
1.144 + assert(this->start_pos() + *size == this->current_pos(), "invariant");
1.145 + write_checkpoint_header(const_cast<u1*>(this->start_pos()), this->used_offset(), _time, is_flushpoint(), count());
1.146 + this->seek(_offset + (_header ? sizeof(JfrCheckpointEntry) : 0));
1.147 + set_count(0);
1.148 + return this->start_pos();
1.149 +}
1.150 +
1.151 +const JfrCheckpointContext JfrCheckpointWriter::context() const {
1.152 + JfrCheckpointContext ctx;
1.153 + ctx.offset = this->current_offset();
1.154 + ctx.count = this->count();
1.155 + return ctx;
1.156 +}
1.157 +
1.158 +void JfrCheckpointWriter::set_context(const JfrCheckpointContext ctx) {
1.159 + this->seek(ctx.offset);
1.160 + set_count(ctx.count);
1.161 +}
1.162 +bool JfrCheckpointWriter::has_data() const {
1.163 + return this->used_size() > sizeof(JfrCheckpointEntry);
1.164 +}
1.165 +
1.166 +JfrCheckpointBlobHandle JfrCheckpointWriter::checkpoint_blob() {
1.167 + size_t size = 0;
1.168 + const u1* data = session_data(&size);
1.169 + return JfrCheckpointBlob::make(data, size);
1.170 +}
1.171 +
1.172 +JfrCheckpointBlobHandle JfrCheckpointWriter::copy(const JfrCheckpointContext* ctx /* 0 */) {
1.173 + if (ctx == NULL) {
1.174 + return checkpoint_blob();
1.175 + }
1.176 + size_t size = 0;
1.177 + const u1* data = session_data(&size, ctx);
1.178 + return JfrCheckpointBlob::make(data, size);
1.179 +}
1.180 +
1.181 +JfrCheckpointBlobHandle JfrCheckpointWriter::move(const JfrCheckpointContext* ctx /* 0 */) {
1.182 + JfrCheckpointBlobHandle data = copy(ctx);
1.183 + if (ctx != NULL) {
1.184 + const_cast<JfrCheckpointContext*>(ctx)->count = 0;
1.185 + set_context(*ctx);
1.186 + }
1.187 + return data;
1.188 +}
