1 /* 2 * Copyright (C) 2016 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_TRACING_H_ 18 #define SIMPLE_PERF_TRACING_H_ 19 20 #include <vector> 21 22 #include <android-base/logging.h> 23 24 #include "event_type.h" 25 #include "utils.h" 26 27 struct TracingField { 28 std::string name; 29 size_t offset; 30 size_t elem_size; 31 size_t elem_count; 32 bool is_signed; 33 }; 34 35 struct TracingFieldPlace { 36 uint32_t offset; 37 uint32_t size; 38 ReadFromDataTracingFieldPlace39 uint64_t ReadFromData(const char* raw_data) { 40 return ConvertBytesToValue(raw_data + offset, size); 41 } 42 }; 43 44 struct StringTracingFieldPlace { 45 uint32_t offset; 46 uint32_t size; 47 ReadFromDataStringTracingFieldPlace48 std::string ReadFromData(const char* raw_data) { 49 char s[size + 1]; 50 s[size] = '\0'; 51 memcpy(s, raw_data + offset, size); 52 return s; 53 } 54 }; 55 56 struct TracingFormat { 57 std::string system_name; 58 std::string name; 59 uint64_t id; 60 std::vector<TracingField> fields; 61 GetFieldTracingFormat62 void GetField(const std::string& name, TracingFieldPlace& place) { 63 const TracingField& field = GetField(name); 64 place.offset = field.offset; 65 place.size = field.elem_size; 66 } 67 GetFieldTracingFormat68 void GetField(const std::string& name, StringTracingFieldPlace& place) { 69 const TracingField& field = GetField(name); 70 place.offset = field.offset; 71 place.size = field.elem_count; 72 } 73 74 private: GetFieldTracingFormat75 const TracingField& GetField(const std::string& name) { 76 for (const auto& field : fields) { 77 if (field.name == name) { 78 return field; 79 } 80 } 81 LOG(FATAL) << "Couldn't find field " << name << "in TracingFormat of " 82 << this->name; 83 return fields[0]; 84 } 85 }; 86 87 class TracingFile; 88 89 class Tracing { 90 public: 91 explicit Tracing(const std::vector<char>& data); 92 ~Tracing(); 93 void Dump(size_t indent); 94 TracingFormat GetTracingFormatHavingId(uint64_t trace_event_id); 95 std::string GetTracingEventNameHavingId(uint64_t trace_event_id); 96 const std::string& GetKallsyms() const; 97 uint32_t GetPageSize() const; 98 99 private: 100 TracingFile* tracing_file_; 101 std::vector<TracingFormat> tracing_formats_; 102 }; 103 104 bool GetTracingData(const std::vector<const EventType*>& event_types, 105 std::vector<char>* data); 106 107 #endif // SIMPLE_PERF_TRACING_H_ 108