Tue, 16 Jun 2020 11:03:04 +0800
8217647: JFR: recordings on 32-bit systems unreadable
Reviewed-by: egahlin
Contributed-by: boris.ulasevich@bell-sw.com, markus.gronlund@oracle.com
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 */
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 #include "runtime/os.hpp"
35 static const u2 JFR_VERSION_MAJOR = 2;
36 static const u2 JFR_VERSION_MINOR = 0;
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;
41 JfrChunkWriter::JfrChunkWriter() : JfrChunkWriterBase(NULL), _chunkstate(NULL) {}
43 bool JfrChunkWriter::initialize() {
44 assert(_chunkstate == NULL, "invariant");
45 _chunkstate = new JfrChunkState();
46 return _chunkstate != NULL;
47 }
49 static fio_fd open_existing(const char* path) {
50 return os::open(path, O_RDWR, S_IREAD | S_IWRITE);
51 }
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 }
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 }
81 size_t JfrChunkWriter::close(int64_t metadata_offset) {
82 write_header(metadata_offset);
83 this->flush();
84 this->close_fd();
85 return (size_t)size_written();
86 }
88 void JfrChunkWriter::write_header(int64_t metadata_offset) {
89 assert(this->is_valid(), "invariant");
90 // Chunk size
91 this->write_be_at_offset((jlong)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((jlong)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 }
104 void JfrChunkWriter::set_chunk_path(const char* chunk_path) {
105 _chunkstate->set_path(chunk_path);
106 }
108 int64_t JfrChunkWriter::size_written() const {
109 return this->is_valid() ? this->current_offset() : 0;
110 }
112 int64_t JfrChunkWriter::previous_checkpoint_offset() const {
113 return _chunkstate->previous_checkpoint_offset();
114 }
116 void JfrChunkWriter::set_previous_checkpoint_offset(int64_t offset) {
117 _chunkstate->set_previous_checkpoint_offset(offset);
118 }
120 void JfrChunkWriter::time_stamp_chunk_now() {
121 _chunkstate->update_time_to_now();
122 }