1 /* 2 * Copyright (C) 2019 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 #include "src/trace_processor/json_trace_utils.h" 18 19 #include <json/value.h> 20 #include <limits> 21 22 #if !PERFETTO_BUILDFLAG(PERFETTO_STANDALONE_BUILD) 23 #error The JSON trace parser is supported only in the standalone build for now. 24 #endif 25 26 namespace perfetto { 27 namespace trace_processor { 28 namespace json_trace_utils { 29 30 // Json trace event timestamps are in us. 31 // https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/edit#heading=h.nso4gcezn7n1 32 base::Optional<int64_t> CoerceToNs(const Json::Value& value) { 33 switch (static_cast<size_t>(value.type())) { 34 case Json::realValue: 35 return static_cast<int64_t>(value.asDouble() * 1000); 36 case Json::uintValue: 37 case Json::intValue: 38 return value.asInt64() * 1000; 39 case Json::stringValue: { 40 std::string s = value.asString(); 41 char* end; 42 int64_t n = strtoll(s.c_str(), &end, 10); 43 if (end != s.data() + s.size()) 44 return base::nullopt; 45 return n * 1000; 46 } 47 default: 48 return base::nullopt; 49 } 50 } 51 52 base::Optional<int64_t> CoerceToInt64(const Json::Value& value) { 53 switch (static_cast<size_t>(value.type())) { 54 case Json::realValue: 55 case Json::uintValue: 56 case Json::intValue: 57 return value.asInt64(); 58 case Json::stringValue: { 59 std::string s = value.asString(); 60 char* end; 61 int64_t n = strtoll(s.c_str(), &end, 10); 62 if (end != s.data() + s.size()) 63 return base::nullopt; 64 return n; 65 } 66 default: 67 return base::nullopt; 68 } 69 } 70 71 base::Optional<uint32_t> CoerceToUint32(const Json::Value& value) { 72 base::Optional<int64_t> result = CoerceToInt64(value); 73 if (!result.has_value()) 74 return base::nullopt; 75 int64_t n = result.value(); 76 if (n < 0 || n > std::numeric_limits<uint32_t>::max()) 77 return base::nullopt; 78 return static_cast<uint32_t>(n); 79 } 80 81 } // namespace json_trace_utils 82 } // namespace trace_processor 83 } // namespace perfetto 84
