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[android-x86/system-extras.git] / simpleperf / record_file.h
1 /*
2  * Copyright (C) 2015 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 #ifndef SIMPLE_PERF_RECORD_FILE_H_
18 #define SIMPLE_PERF_RECORD_FILE_H_
19
20 #include <stdio.h>
21
22 #include <functional>
23 #include <map>
24 #include <memory>
25 #include <string>
26 #include <unordered_map>
27 #include <vector>
28
29 #include <android-base/macros.h>
30
31 #include "dso.h"
32 #include "event_attr.h"
33 #include "perf_event.h"
34 #include "record.h"
35 #include "record_file_format.h"
36 #include "thread_tree.h"
37
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 {
42  public:
43   static std::unique_ptr<RecordFileWriter> CreateInstance(const std::string& filename);
44
45   ~RecordFileWriter();
46
47   bool WriteAttrSection(const std::vector<EventAttrWithId>& attr_ids);
48   bool WriteRecord(const Record& record);
49
50   bool ReadDataSection(const std::function<void(const Record*)>& callback);
51
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,
59                         uint32_t file_type,
60                         uint64_t min_vaddr,
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();
65
66   bool Close();
67
68  private:
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);
81
82   const std::string filename_;
83   FILE* record_fp_;
84
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_;
91
92   std::map<int, PerfFileFormat::SectionDesc> features_;
93   size_t feature_count_;
94
95   DISALLOW_COPY_AND_ASSIGN(RecordFileWriter);
96 };
97
98 // RecordFileReader read contents from a perf record file, like perf.data.
99 class RecordFileReader {
100  public:
101   static std::unique_ptr<RecordFileReader> CreateInstance(const std::string& filename);
102
103   ~RecordFileReader();
104
105   const PerfFileFormat::FileHeader& FileHeader() const {
106     return header_;
107   }
108
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];
114     }
115     return result;
116   }
117
118   const std::map<int, PerfFileFormat::SectionDesc>& FeatureSectionDescriptors() const {
119     return feature_section_descriptors_;
120   }
121   bool HasFeature(int feature) const {
122     return feature_section_descriptors_.find(feature) != feature_section_descriptors_.end();
123   }
124   bool ReadFeatureSection(int feature, std::vector<char>* data);
125
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.
129
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,
132                        bool sorted = true);
133
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);
138
139   size_t GetAttrIndexOfRecord(const Record* record);
140
141   std::vector<std::string> ReadCmdlineFeature();
142   std::vector<BuildIdRecord> ReadBuildIdFeature();
143   std::string ReadFeatureString(int feature);
144
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
149   // information.
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);
154
155   void LoadBuildIdAndFileFeatures(ThreadTree& thread_tree);
156
157   bool Close();
158
159   // For testing only.
160   std::vector<std::unique_ptr<Record>> DataSection();
161
162  private:
163   RecordFileReader(const std::string& filename, FILE* fp);
164   bool ReadHeader();
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);
171
172   const std::string filename_;
173   FILE* record_fp_;
174
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_;
180
181   size_t event_id_pos_in_sample_records_;
182   size_t event_id_reverse_pos_in_non_sample_records_;
183
184   std::unique_ptr<RecordCache> record_cache_;
185   uint64_t read_record_size_;
186
187   DISALLOW_COPY_AND_ASSIGN(RecordFileReader);
188 };
189
190 #endif  // SIMPLE_PERF_RECORD_FILE_H_