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_FORMAT_H_ 18 #define SIMPLE_PERF_RECORD_FILE_FORMAT_H_ 19 20 #include <string> 21 22 #include "perf_event.h" 23 24 /* 25 The file structure of perf.data: 26 file_header 27 id_section 28 attr section 29 data section 30 feature section 31 32 The feature section has the following structure: 33 a section descriptor array, each element contains the section information of one add_feature. 34 data section of feature 1 35 data section of feature 2 36 .... 37 38 file feature section: 39 file_struct files[]; 40 41 struct file_struct { 42 uint32_t size; // size of rest fields in file_struct 43 char file_path[]; 44 uint32_t file_type; 45 uint64_t min_vaddr; 46 uint32_t symbol_count; 47 struct { 48 uint64_t start_vaddr; 49 uint32_t len; 50 char symbol_name[len+1]; 51 } symbol_table[symbol_count]; 52 53 uint32_t dex_file_offset_count; // Only when file_type = DSO_DEX_FILE 54 uint64_t dex_file_offsets[dex_file_offset_count]; // Only when file_type = DSO_DEX_FILE 55 uint64_t file_offset_of_min_vaddr; // Only when file_type = DSO_ELF_FILE 56 }; 57 58 meta_info feature section: 59 meta_info infos[]; 60 61 struct meta_info { 62 char key[]; 63 char value[]; 64 }; 65 keys in meta_info feature section include: 66 simpleperf_version, 67 68 */ 69 70 namespace PerfFileFormat { 71 72 enum { 73 FEAT_RESERVED = 0, 74 FEAT_FIRST_FEATURE = 1, 75 FEAT_TRACING_DATA = 1, 76 FEAT_BUILD_ID, 77 FEAT_HOSTNAME, 78 FEAT_OSRELEASE, 79 FEAT_VERSION, 80 FEAT_ARCH, 81 FEAT_NRCPUS, 82 FEAT_CPUDESC, 83 FEAT_CPUID, 84 FEAT_TOTAL_MEM, 85 FEAT_CMDLINE, 86 FEAT_EVENT_DESC, 87 FEAT_CPU_TOPOLOGY, 88 FEAT_NUMA_TOPOLOGY, 89 FEAT_BRANCH_STACK, 90 FEAT_PMU_MAPPINGS, 91 FEAT_GROUP_DESC, 92 FEAT_LAST_FEATURE, 93 94 FEAT_SIMPLEPERF_START = 128, 95 FEAT_FILE = FEAT_SIMPLEPERF_START, 96 FEAT_META_INFO, 97 FEAT_MAX_NUM = 256, 98 }; 99 100 std::string GetFeatureName(int feature_id); 101 int GetFeatureId(const std::string& feature_name); 102 103 struct SectionDesc { 104 uint64_t offset; 105 uint64_t size; 106 }; 107 108 constexpr char PERF_MAGIC[] = "PERFILE2"; 109 110 struct FileHeader { 111 char magic[8]; 112 uint64_t header_size; 113 uint64_t attr_size; 114 SectionDesc attrs; 115 SectionDesc data; 116 SectionDesc event_types; 117 unsigned char features[FEAT_MAX_NUM / 8]; 118 }; 119 120 struct FileAttr { 121 perf_event_attr attr; 122 SectionDesc ids; 123 }; 124 125 } // namespace PerfFileFormat 126 127 #endif // SIMPLE_PERF_RECORD_FILE_FORMAT_H_ 128