1 /* 2 * Copyright (C) 2018 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 SRC_TRACE_PROCESSOR_SLICE_TABLE_H_ 18 #define SRC_TRACE_PROCESSOR_SLICE_TABLE_H_ 19 20 #include "src/trace_processor/storage_table.h" 21 22 namespace perfetto { 23 namespace trace_processor { 24 25 class QueryConstraints; 26 class TraceStorage; 27 28 // A virtual table that allows to query slices coming from userspace events 29 // such as chromium TRACE_EVENT macros. Conversely to "shced" slices, these 30 // slices can be nested and form stacks. 31 // The current implementation of this table is extremely simple and not 32 // particularly efficient, as it delegates all the sorting and filtering to 33 // the SQLite query engine. 34 class SliceTable : public StorageTable { 35 public: 36 SliceTable(sqlite3*, const TraceStorage* storage); 37 38 static void RegisterTable(sqlite3* db, const TraceStorage* storage); 39 40 // StorageTable implementation. 41 StorageSchema CreateStorageSchema() override; 42 uint32_t RowCount() override; 43 int BestIndex(const QueryConstraints&, BestIndexInfo*) override; 44 45 private: 46 uint32_t EstimateCost(const QueryConstraints&); 47 48 std::vector<const char*> ref_types_; 49 const TraceStorage* const storage_; 50 }; 51 52 } // namespace trace_processor 53 } // namespace perfetto 54 55 #endif // SRC_TRACE_PROCESSOR_SLICE_TABLE_H_ 56