1 /*
2 * Copyright (C) 2024 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "src/trace_processor/importers/perf/attrs_section_reader.h"
18
19 #include <cinttypes>
20 #include <cstddef>
21 #include <utility>
22
23 #include "perfetto/base/logging.h"
24 #include "perfetto/base/status.h"
25 #include "perfetto/ext/base/status_or.h"
26 #include "perfetto/trace_processor/trace_blob_view.h"
27 #include "src/trace_processor/importers/perf/perf_file.h"
28
29 namespace perfetto::trace_processor::perf_importer {
30
31 // static
Create(const PerfFile::Header & header,TraceBlobView section)32 base::StatusOr<AttrsSectionReader> AttrsSectionReader::Create(
33 const PerfFile::Header& header,
34 TraceBlobView section) {
35 PERFETTO_CHECK(section.size() == header.attrs.size);
36
37 if (header.attr_size == 0) {
38 return base::ErrStatus("Invalid attr_size (0) in perf file header.");
39 }
40
41 if (header.attrs.size % header.attr_size != 0) {
42 return base::ErrStatus("Invalid attrs section size %" PRIu64
43 " for attr_size %" PRIu64 " in perf file header.",
44 header.attrs.size, header.attr_size);
45 }
46
47 const size_t num_attr = header.attrs.size / header.attr_size;
48
49 // Each entry is a perf_event_attr followed by a Section, but the size of
50 // the perf_event_attr struct written in the file might not be the same as
51 // sizeof(perf_event_attr) as this struct might grow over time (can be
52 // bigger or smaller).
53 static constexpr size_t kSectionSize = sizeof(PerfFile::Section);
54 if (header.attr_size < kSectionSize) {
55 return base::ErrStatus(
56 "Invalid attr_size in file header. Expected at least %zu, found "
57 "%" PRIu64,
58 kSectionSize, header.attr_size);
59 }
60 const size_t attr_size = header.attr_size - kSectionSize;
61
62 return AttrsSectionReader(std::move(section), num_attr, attr_size);
63 }
64
ReadNext(PerfFile::AttrsEntry & entry)65 base::Status AttrsSectionReader::ReadNext(PerfFile::AttrsEntry& entry) {
66 PERFETTO_CHECK(reader_.ReadPerfEventAttr(entry.attr, attr_size_));
67
68 if (entry.attr.size != attr_size_) {
69 return base::ErrStatus(
70 "Invalid attr.size. Expected %zu, but found %" PRIu32, attr_size_,
71 entry.attr.size);
72 }
73
74 PERFETTO_CHECK(reader_.Read(entry.ids));
75 --num_attr_;
76 return base::OkStatus();
77 }
78
79 } // namespace perfetto::trace_processor::perf_importer
80