| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "record_file.h" |
| |
| #include <fcntl.h> |
| #include <string.h> |
| #include <set> |
| #include <vector> |
| |
| #include <android-base/logging.h> |
| |
| #include "event_attr.h" |
| #include "record.h" |
| #include "utils.h" |
| |
| using namespace PerfFileFormat; |
| |
| std::unique_ptr<RecordFileReader> RecordFileReader::CreateInstance(const std::string& filename) { |
| std::string mode = std::string("rb") + CLOSE_ON_EXEC_MODE; |
| FILE* fp = fopen(filename.c_str(), mode.c_str()); |
| if (fp == nullptr) { |
| PLOG(ERROR) << "failed to open record file '" << filename << "'"; |
| return nullptr; |
| } |
| auto reader = std::unique_ptr<RecordFileReader>(new RecordFileReader(filename, fp)); |
| if (!reader->ReadHeader() || !reader->ReadAttrSection() || |
| !reader->ReadFeatureSectionDescriptors()) { |
| return nullptr; |
| } |
| return reader; |
| } |
| |
| RecordFileReader::RecordFileReader(const std::string& filename, FILE* fp) |
| : filename_(filename), record_fp_(fp), event_id_pos_in_sample_records_(0), |
| event_id_reverse_pos_in_non_sample_records_(0) { |
| } |
| |
| RecordFileReader::~RecordFileReader() { |
| if (record_fp_ != nullptr) { |
| Close(); |
| } |
| } |
| |
| bool RecordFileReader::Close() { |
| bool result = true; |
| if (fclose(record_fp_) != 0) { |
| PLOG(ERROR) << "failed to close record file '" << filename_ << "'"; |
| result = false; |
| } |
| record_fp_ = nullptr; |
| return result; |
| } |
| |
| bool RecordFileReader::ReadHeader() { |
| if (fread(&header_, sizeof(header_), 1, record_fp_) != 1) { |
| PLOG(ERROR) << "failed to read file " << filename_; |
| return false; |
| } |
| return true; |
| } |
| |
| bool RecordFileReader::ReadAttrSection() { |
| size_t attr_count = header_.attrs.size / header_.attr_size; |
| if (header_.attr_size != sizeof(FileAttr)) { |
| LOG(DEBUG) << "attr size (" << header_.attr_size << ") in " << filename_ |
| << " doesn't match expected size (" << sizeof(FileAttr) << ")"; |
| } |
| if (attr_count == 0) { |
| LOG(ERROR) << "no attr in file " << filename_; |
| return false; |
| } |
| if (fseek(record_fp_, header_.attrs.offset, SEEK_SET) != 0) { |
| PLOG(ERROR) << "failed to fseek()"; |
| return false; |
| } |
| for (size_t i = 0; i < attr_count; ++i) { |
| std::vector<char> buf(header_.attr_size); |
| if (fread(&buf[0], buf.size(), 1, record_fp_) != 1) { |
| PLOG(ERROR) << "failed to read " << filename_; |
| return false; |
| } |
| // The size of perf_event_attr is changing between different linux kernel versions. |
| // Make sure we copy correct data to memory. |
| FileAttr attr; |
| memset(&attr, 0, sizeof(attr)); |
| size_t section_desc_size = sizeof(attr.ids); |
| size_t perf_event_attr_size = header_.attr_size - section_desc_size; |
| memcpy(&attr.attr, &buf[0], std::min(sizeof(attr.attr), perf_event_attr_size)); |
| memcpy(&attr.ids, &buf[perf_event_attr_size], section_desc_size); |
| file_attrs_.push_back(attr); |
| } |
| if (file_attrs_.size() > 1) { |
| std::vector<perf_event_attr> attrs; |
| for (const auto& file_attr : file_attrs_) { |
| attrs.push_back(file_attr.attr); |
| } |
| if (!GetCommonEventIdPositionsForAttrs(attrs, &event_id_pos_in_sample_records_, |
| &event_id_reverse_pos_in_non_sample_records_)) { |
| return false; |
| } |
| } |
| for (size_t i = 0; i < file_attrs_.size(); ++i) { |
| std::vector<uint64_t> ids; |
| if (!ReadIdsForAttr(file_attrs_[i], &ids)) { |
| return false; |
| } |
| for (auto id : ids) { |
| event_id_to_attr_map_[id] = &file_attrs_[i].attr; |
| } |
| } |
| return true; |
| } |
| |
| bool RecordFileReader::ReadFeatureSectionDescriptors() { |
| std::vector<int> features; |
| for (size_t i = 0; i < sizeof(header_.features); ++i) { |
| for (size_t j = 0; j < 8; ++j) { |
| if (header_.features[i] & (1 << j)) { |
| features.push_back(i * 8 + j); |
| } |
| } |
| } |
| uint64_t feature_section_offset = header_.data.offset + header_.data.size; |
| if (fseek(record_fp_, feature_section_offset, SEEK_SET) != 0) { |
| PLOG(ERROR) << "failed to fseek()"; |
| return false; |
| } |
| for (const auto& id : features) { |
| SectionDesc desc; |
| if (fread(&desc, sizeof(desc), 1, record_fp_) != 1) { |
| PLOG(ERROR) << "failed to read " << filename_; |
| return false; |
| } |
| feature_section_descriptors_.emplace(id, desc); |
| } |
| return true; |
| } |
| |
| bool RecordFileReader::ReadIdsForAttr(const FileAttr& attr, std::vector<uint64_t>* ids) { |
| size_t id_count = attr.ids.size / sizeof(uint64_t); |
| if (fseek(record_fp_, attr.ids.offset, SEEK_SET) != 0) { |
| PLOG(ERROR) << "failed to fseek()"; |
| return false; |
| } |
| ids->resize(id_count); |
| if (fread(ids->data(), attr.ids.size, 1, record_fp_) != 1) { |
| PLOG(ERROR) << "failed to read file " << filename_; |
| return false; |
| } |
| return true; |
| } |
| |
| bool RecordFileReader::ReadDataSection(std::function<bool(std::unique_ptr<Record>)> callback, |
| bool sorted) { |
| if (fseek(record_fp_, header_.data.offset, SEEK_SET) != 0) { |
| PLOG(ERROR) << "failed to fseek()"; |
| return false; |
| } |
| bool has_timestamp = true; |
| for (const auto& attr : file_attrs_) { |
| if (!IsTimestampSupported(attr.attr)) { |
| has_timestamp = false; |
| break; |
| } |
| } |
| RecordCache cache(has_timestamp); |
| for (size_t nbytes_read = 0; nbytes_read < header_.data.size;) { |
| std::unique_ptr<Record> record = ReadRecord(); |
| if (record == nullptr) { |
| return false; |
| } |
| nbytes_read += record->size(); |
| if (sorted) { |
| cache.Push(std::move(record)); |
| record = cache.Pop(); |
| if (record != nullptr) { |
| if (!callback(std::move(record))) { |
| return false; |
| } |
| } |
| } else { |
| if (!callback(std::move(record))) { |
| return false; |
| } |
| } |
| } |
| std::vector<std::unique_ptr<Record>> records = cache.PopAll(); |
| for (auto& record : records) { |
| if (!callback(std::move(record))) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| std::unique_ptr<Record> RecordFileReader::ReadRecord() { |
| std::vector<char> buf(sizeof(perf_event_header)); |
| if (fread(buf.data(), sizeof(perf_event_header), 1, record_fp_) != 1) { |
| PLOG(ERROR) << "failed to read file " << filename_; |
| return nullptr; |
| } |
| perf_event_header* header = reinterpret_cast<perf_event_header*>(&buf[0]); |
| if (buf.size() < header->size) { |
| buf.resize(header->size); |
| header = reinterpret_cast<perf_event_header*>(&buf[0]); |
| } |
| if (fread(&buf[sizeof(perf_event_header)], buf.size() - sizeof(perf_event_header), 1, record_fp_) != 1) { |
| PLOG(ERROR) << "failed to read file " << filename_; |
| return nullptr; |
| } |
| const perf_event_attr* attr = &file_attrs_[0].attr; |
| if (file_attrs_.size() > 1) { |
| uint64_t event_id; |
| if (header->type == PERF_RECORD_SAMPLE) { |
| event_id = *reinterpret_cast<uint64_t*>(&buf[event_id_pos_in_sample_records_]); |
| } else { |
| event_id = *reinterpret_cast<uint64_t*>( |
| &buf[header->size - event_id_reverse_pos_in_non_sample_records_]); |
| } |
| auto it = event_id_to_attr_map_.find(event_id); |
| CHECK(it != event_id_to_attr_map_.end()); |
| attr = it->second; |
| } |
| return ReadRecordFromBuffer(*attr, header); |
| } |
| |
| bool RecordFileReader::ReadFeatureSection(int feature, std::vector<char>* data) { |
| const std::map<int, SectionDesc>& section_map = FeatureSectionDescriptors(); |
| auto it = section_map.find(feature); |
| if (it == section_map.end()) { |
| return false; |
| } |
| SectionDesc section = it->second; |
| data->resize(section.size); |
| if (fseek(record_fp_, section.offset, SEEK_SET) != 0) { |
| PLOG(ERROR) << "failed to fseek()"; |
| return false; |
| } |
| if (fread(data->data(), data->size(), 1, record_fp_) != 1) { |
| PLOG(ERROR) << "failed to read " << filename_; |
| return false; |
| } |
| return true; |
| } |
| |
| std::vector<std::string> RecordFileReader::ReadCmdlineFeature() { |
| std::vector<char> buf; |
| if (!ReadFeatureSection(FEAT_CMDLINE, &buf)) { |
| return std::vector<std::string>(); |
| } |
| const char* p = buf.data(); |
| const char* end = buf.data() + buf.size(); |
| std::vector<std::string> cmdline; |
| uint32_t arg_count; |
| MoveFromBinaryFormat(arg_count, p); |
| CHECK_LE(p, end); |
| for (size_t i = 0; i < arg_count; ++i) { |
| uint32_t len; |
| MoveFromBinaryFormat(len, p); |
| CHECK_LE(p + len, end); |
| cmdline.push_back(p); |
| p += len; |
| } |
| return cmdline; |
| } |
| |
| std::vector<BuildIdRecord> RecordFileReader::ReadBuildIdFeature() { |
| std::vector<char> buf; |
| if (!ReadFeatureSection(FEAT_BUILD_ID, &buf)) { |
| return std::vector<BuildIdRecord>(); |
| } |
| const char* p = buf.data(); |
| const char* end = buf.data() + buf.size(); |
| std::vector<BuildIdRecord> result; |
| while (p < end) { |
| const perf_event_header* header = reinterpret_cast<const perf_event_header*>(p); |
| CHECK_LE(p + header->size, end); |
| BuildIdRecord record(header); |
| // Set type explicitly as the perf.data produced by perf doesn't set it. |
| record.header.type = PERF_RECORD_BUILD_ID; |
| result.push_back(record); |
| p += header->size; |
| } |
| return result; |
| } |
| |
| std::string RecordFileReader::ReadFeatureString(int feature) { |
| std::vector<char> buf; |
| if (!ReadFeatureSection(feature, &buf)) { |
| return std::string(); |
| } |
| const char* p = buf.data(); |
| const char* end = buf.data() + buf.size(); |
| uint32_t len; |
| MoveFromBinaryFormat(len, p); |
| CHECK_LE(p + len, end); |
| return p; |
| } |
| |
| std::vector<std::unique_ptr<Record>> RecordFileReader::DataSection() { |
| std::vector<std::unique_ptr<Record>> records; |
| ReadDataSection([&](std::unique_ptr<Record> record) { |
| records.push_back(std::move(record)); |
| return true; |
| }); |
| return records; |
| } |