1 /*

     2  * Copyright (c) 2012, 2018, 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/recorder/repository/jfrChunkState.hpp"

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

    28 #include "jfr/recorder/service/jfrOptionSet.hpp"

    29 #include "jfr/utilities/jfrTime.hpp"

    30 #include "jfr/utilities/jfrTypes.hpp"

    31 #include "runtime/mutexLocker.hpp"

    32 #include "runtime/os.hpp"

    33 

    34 const u2 JFR_VERSION_MAJOR = 2;

    35 const u2 JFR_VERSION_MINOR = 0;

    36 

    37 static const size_t MAGIC_LEN = 4;

    38 static const size_t FILEHEADER_SLOT_SIZE = 8;

    39 static const size_t CHUNK_SIZE_OFFSET = 8;

    40 

    41 JfrChunkWriter::JfrChunkWriter() : JfrChunkWriterBase(NULL), _chunkstate(NULL) {}

    42 

    43 bool JfrChunkWriter::initialize() {

    44   assert(_chunkstate == NULL, "invariant");

    45   _chunkstate = new JfrChunkState();

    46   return _chunkstate != NULL;

    47 }

    48 

    49 static fio_fd open_existing(const char* path) {

    50   return os::open(path, O_RDWR, S_IREAD | S_IWRITE);

    51 }

    52 

    53 static fio_fd open_chunk(const char* path) {

    54   assert(JfrStream_lock->owned_by_self(), "invariant");

    55   return path != NULL ? open_existing(path) : invalid_fd;

    56 }

    57 

    58 bool JfrChunkWriter::open() {

    59   assert(_chunkstate != NULL, "invariant");

    60   JfrChunkWriterBase::reset(open_chunk(_chunkstate->path()));

    61   const bool is_open = this->has_valid_fd();

    62   if (is_open) {

    63     this->bytes("FLR", MAGIC_LEN);

    64     this->be_write((u2)JFR_VERSION_MAJOR);

    65     this->be_write((u2)JFR_VERSION_MINOR);

    66     this->reserve(6 * FILEHEADER_SLOT_SIZE);

    67     // u8 chunk_size

    68     // u8 initial checkpoint offset

    69     // u8 metadata section offset

    70     // u8 chunk start nanos

    71     // u8 chunk duration nanos

    72     // u8 chunk start ticks

    73     this->be_write(JfrTime::frequency());

    74     // chunk capabilities, CompressedIntegers etc

    75     this->be_write((u4)JfrOptionSet::compressed_integers() ? 1 : 0);

    76     _chunkstate->reset();

    77   }

    78   return is_open;

    79 }

    80 

    81 size_t JfrChunkWriter::close(intptr_t metadata_offset) {

    82   write_header(metadata_offset);

    83   this->flush();

    84   this->close_fd();

    85   return size_written();

    86 }

    87 

    88 void JfrChunkWriter::write_header(intptr_t metadata_offset) {

    89   assert(this->is_valid(), "invariant");

    90   // Chunk size

    91   this->write_be_at_offset(size_written(), CHUNK_SIZE_OFFSET);

    92   // initial checkpoint event offset

    93   this->write_be_at_offset(_chunkstate->previous_checkpoint_offset(), CHUNK_SIZE_OFFSET + (1 * FILEHEADER_SLOT_SIZE));

    94   // metadata event offset

    95   this->write_be_at_offset(metadata_offset, CHUNK_SIZE_OFFSET + (2 * FILEHEADER_SLOT_SIZE));

    96   // start of chunk in nanos since epoch

    97   this->write_be_at_offset(_chunkstate->previous_start_nanos(), CHUNK_SIZE_OFFSET + (3 * FILEHEADER_SLOT_SIZE));

    98   // duration of chunk in nanos

    99   this->write_be_at_offset(_chunkstate->last_chunk_duration(), CHUNK_SIZE_OFFSET + (4 * FILEHEADER_SLOT_SIZE));

   100   // start of chunk in ticks

   101   this->write_be_at_offset(_chunkstate->previous_start_ticks(), CHUNK_SIZE_OFFSET + (5 * FILEHEADER_SLOT_SIZE));

   102 }

   103 

   104 void JfrChunkWriter::set_chunk_path(const char* chunk_path) {

   105   _chunkstate->set_path(chunk_path);

   106 }

   107 

   108 intptr_t JfrChunkWriter::size_written() const {

   109   return this->is_valid() ? this->current_offset() : 0;

   110 }

   111 

   112 intptr_t JfrChunkWriter::previous_checkpoint_offset() const {

   113   return _chunkstate->previous_checkpoint_offset();

   114 }

   115 

   116 void JfrChunkWriter::set_previous_checkpoint_offset(intptr_t offset) {

   117   _chunkstate->set_previous_checkpoint_offset(offset);

   118 }

   119 

   120 void JfrChunkWriter::time_stamp_chunk_now() {

   121   _chunkstate->update_time_to_now();

   122 }