1 /* 2 * Copyright (C) 2021 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_PRELUDE_TABLE_FUNCTIONS_DESCENDANT_H_ 18 #define SRC_TRACE_PROCESSOR_PRELUDE_TABLE_FUNCTIONS_DESCENDANT_H_ 19 20 #include <optional> 21 22 #include "src/trace_processor/prelude/table_functions/table_function.h" 23 #include "src/trace_processor/storage/trace_storage.h" 24 25 namespace perfetto { 26 namespace trace_processor { 27 28 class TraceProcessorContext; 29 30 // Implements the following dynamic tables: 31 // * descendant_slice 32 // * descendant_slice_by_stack 33 // 34 // See docs/analysis/trace-processor for usage. 35 class Descendant : public TableFunction { 36 public: 37 enum class Type { kSlice = 1, kSliceByStack = 2 }; 38 39 Descendant(Type type, const TraceStorage*); 40 41 Table::Schema CreateSchema() override; 42 std::string TableName() override; 43 uint32_t EstimateRowCount() override; 44 base::Status ValidateConstraints(const QueryConstraints&) override; 45 base::Status ComputeTable(const std::vector<Constraint>& cs, 46 const std::vector<Order>& ob, 47 const BitVector& cols_used, 48 std::unique_ptr<Table>& table_return) override; 49 50 // Returns a vector of slice rows which are descendants of |slice_id|. Returns 51 // std::nullopt if an invalid |slice_id| is given. This is used by 52 // ConnectedFlow to traverse flow indirectly connected flow events. 53 static std::optional<std::vector<tables::SliceTable::RowNumber>> 54 GetDescendantSlices(const tables::SliceTable& slices, SliceId slice_id); 55 56 private: 57 Type type_; 58 const TraceStorage* storage_ = nullptr; 59 }; 60 61 } // namespace trace_processor 62 } // namespace perfetto 63 64 #endif // SRC_TRACE_PROCESSOR_PRELUDE_TABLE_FUNCTIONS_DESCENDANT_H_ 65