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_FTRACE_DESCRIPTORS_H_ 18 #define SRC_TRACE_PROCESSOR_FTRACE_DESCRIPTORS_H_ 19 20 #include <array> 21 #include "perfetto/protozero/proto_utils.h" 22 23 namespace perfetto { 24 namespace trace_processor { 25 26 using protozero::proto_utils::ProtoSchemaType; 27 28 // We assume that no ftrace event (e.g. SchedSwitchFtraceEvent) has a proto 29 // field which id is >= this. 30 static constexpr size_t kMaxFtraceEventFields = 32; 31 32 // This file is the header for the generated descriptors for all ftrace event 33 // protos. These descriptors can be used to parse ftrace event protos without 34 // needing individual parsing logic for every event. (In proto_trace_parser.cc) 35 // By generating these descriptors we avoid having to build the full proto 36 // library. These structs deliberately don't have a ctor (nor are initialized) 37 // because they are used to define linker-initialized dicts in the .cc file. 38 struct FieldDescriptor { 39 const char* name; 40 ProtoSchemaType type; 41 }; 42 43 struct MessageDescriptor { 44 const char* name; 45 size_t max_field_id; 46 FieldDescriptor fields[kMaxFtraceEventFields]; 47 }; 48 49 MessageDescriptor* GetMessageDescriptorForId(size_t id); 50 size_t GetDescriptorsSize(); 51 52 } // namespace trace_processor 53 } // namespace perfetto 54 #endif // SRC_TRACE_PROCESSOR_FTRACE_DESCRIPTORS_H_ 55