2 * Copyright (C) 2015 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #ifndef SIMPLE_PERF_RECORD_FILE_H_
18 #define SIMPLE_PERF_RECORD_FILE_H_
26 #include <unordered_map>
29 #include <android-base/macros.h>
32 #include "event_attr.h"
33 #include "perf_event.h"
35 #include "record_file_format.h"
36 #include "thread_tree.h"
38 // RecordFileWriter writes to a perf record file, like perf.data.
39 // User should call RecordFileWriter::Close() to finish writing the file, otherwise the file will
40 // be removed in RecordFileWriter::~RecordFileWriter().
41 class RecordFileWriter {
43 static std::unique_ptr<RecordFileWriter> CreateInstance(const std::string& filename);
47 bool WriteAttrSection(const std::vector<EventAttrWithId>& attr_ids);
48 bool WriteRecord(const Record& record);
50 bool ReadDataSection(const std::function<void(const Record*)>& callback);
52 bool BeginWriteFeatures(size_t feature_count);
53 bool WriteBuildIdFeature(const std::vector<BuildIdRecord>& build_id_records);
54 bool WriteFeatureString(int feature, const std::string& s);
55 bool WriteCmdlineFeature(const std::vector<std::string>& cmdline);
56 bool WriteBranchStackFeature();
57 bool WriteFileFeatures(const std::vector<Dso*>& files);
58 bool WriteFileFeature(const std::string& file_path,
61 const std::vector<const Symbol*>& symbols);
62 bool WriteMetaInfoFeature(const std::unordered_map<std::string, std::string>& info_map);
63 bool WriteFeature(int feature, const std::vector<char>& data);
64 bool EndWriteFeatures();
69 RecordFileWriter(const std::string& filename, FILE* fp);
70 void GetHitModulesInBuffer(const char* p, const char* end,
71 std::vector<std::string>* hit_kernel_modules,
72 std::vector<std::string>* hit_user_files);
73 bool WriteFileHeader();
74 bool WriteData(const void* buf, size_t len);
75 bool Write(const void* buf, size_t len);
76 bool Read(void* buf, size_t len);
77 bool GetFilePos(uint64_t* file_pos);
78 bool WriteStringWithLength(const std::string& s);
79 bool WriteFeatureBegin(int feature);
80 bool WriteFeatureEnd(int feature);
82 const std::string filename_;
85 perf_event_attr event_attr_;
86 uint64_t attr_section_offset_;
87 uint64_t attr_section_size_;
88 uint64_t data_section_offset_;
89 uint64_t data_section_size_;
90 uint64_t feature_section_offset_;
92 std::map<int, PerfFileFormat::SectionDesc> features_;
93 size_t feature_count_;
95 DISALLOW_COPY_AND_ASSIGN(RecordFileWriter);
98 // RecordFileReader read contents from a perf record file, like perf.data.
99 class RecordFileReader {
101 static std::unique_ptr<RecordFileReader> CreateInstance(const std::string& filename);
105 const PerfFileFormat::FileHeader& FileHeader() const {
109 std::vector<EventAttrWithId> AttrSection() const {
110 std::vector<EventAttrWithId> result(file_attrs_.size());
111 for (size_t i = 0; i < file_attrs_.size(); ++i) {
112 result[i].attr = &file_attrs_[i].attr;
113 result[i].ids = event_ids_for_file_attrs_[i];
118 const std::map<int, PerfFileFormat::SectionDesc>& FeatureSectionDescriptors() const {
119 return feature_section_descriptors_;
121 bool HasFeature(int feature) const {
122 return feature_section_descriptors_.find(feature) != feature_section_descriptors_.end();
124 bool ReadFeatureSection(int feature, std::vector<char>* data);
126 // There are two ways to read records in data section: one is by calling
127 // ReadDataSection(), and [callback] is called for each Record. the other
128 // is by calling ReadRecord() in a loop.
130 // If sorted is true, sort records before passing them to callback function.
131 bool ReadDataSection(const std::function<bool(std::unique_ptr<Record>)>& callback,
134 // Read next record. If read successfully, set [record] and return true.
135 // If there is no more records, set [record] to nullptr and return true.
136 // Otherwise return false.
137 bool ReadRecord(std::unique_ptr<Record>& record, bool sorted = true);
139 size_t GetAttrIndexOfRecord(const Record* record);
141 std::vector<std::string> ReadCmdlineFeature();
142 std::vector<BuildIdRecord> ReadBuildIdFeature();
143 std::string ReadFeatureString(int feature);
145 // File feature section contains many file information. This function reads
146 // one file information located at [read_pos]. [read_pos] is 0 at the first
147 // call, and is updated to point to the next file information. Return true
148 // if read successfully, and return false if there is no more file
150 bool ReadFileFeature(size_t& read_pos, std::string* file_path,
151 uint32_t* file_type, uint64_t* min_vaddr,
152 std::vector<Symbol>* symbols);
153 bool ReadMetaInfoFeature(std::unordered_map<std::string, std::string>* info_map);
155 void LoadBuildIdAndFileFeatures(ThreadTree& thread_tree);
160 std::vector<std::unique_ptr<Record>> DataSection();
163 RecordFileReader(const std::string& filename, FILE* fp);
165 bool ReadAttrSection();
166 bool ReadIdsForAttr(const PerfFileFormat::FileAttr& attr, std::vector<uint64_t>* ids);
167 bool ReadFeatureSectionDescriptors();
168 std::unique_ptr<Record> ReadRecord(uint64_t* nbytes_read);
169 bool Read(void* buf, size_t len);
170 void ProcessEventIdRecord(const EventIdRecord& r);
172 const std::string filename_;
175 PerfFileFormat::FileHeader header_;
176 std::vector<PerfFileFormat::FileAttr> file_attrs_;
177 std::vector<std::vector<uint64_t>> event_ids_for_file_attrs_;
178 std::unordered_map<uint64_t, size_t> event_id_to_attr_map_;
179 std::map<int, PerfFileFormat::SectionDesc> feature_section_descriptors_;
181 size_t event_id_pos_in_sample_records_;
182 size_t event_id_reverse_pos_in_non_sample_records_;
184 std::unique_ptr<RecordCache> record_cache_;
185 uint64_t read_record_size_;
187 DISALLOW_COPY_AND_ASSIGN(RecordFileReader);
190 #endif // SIMPLE_PERF_RECORD_FILE_H_