apache / brpc - Conditional Complexity

Intro

Conditional complexity (also called cyclomatic complexity) is a term used to measure the complexity of software. The term refers to the number of possible paths through a program function. A higher value ofter means higher maintenance and testing costs (infosecinstitute.com).
Conditional complexity is calculated by counting all conditions in the program that can affect the execution path (e.g. if statement, loops, switches, and/or operators, try and catch blocks...).
Conditional complexity is measured at the unit level (methods, functions...).
Units are classified in four categories based on the measured McCabe index: 1-5 (simple units), 6-10 (medium complex units), 11-25 (complex units), 26+ (very complex units).

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Conditional Complexity Overall

There are 6,443 units with 78,451 lines of code in units (56.4% of code).

9 very complex units (3,179 lines of code)
35 complex units (5,282 lines of code)
237 medium complex units (15,012 lines of code)
519 simple units (15,782 lines of code)
5,643 very simple units (39,196 lines of code)

Legend:

51+

26-50

11-25

6-10

1-5

Alternative Visuals

3D view of all units

Conditional Complexity per Extension

51+

26-50

11-25

6-10

1-5

Conditional Complexity per Logical Component

primary logical decomposition

51+

26-50

11-25

6-10

1-5

Most Complex Units

Top 50 most complex units

Unit	# lines	McCabe index	# params
size_t http_parser_execute() in src/brpc/details/http_parser.cpp	1089	331	4
static bool generate_serializing() in src/mcpack2pb/generator.cpp	423	110	4
int Server::StartInternal() in src/brpc/server.cpp	368	87	3
ssize_t SafeSNPrintf() in src/butil/strings/safe_sprintf.cc	153	65	5
void ProcessHttpRequest() in src/brpc/policy/http_rpc_protocol.cpp	287	64	1
static void StartProfiling() in src/brpc/builtin/hotspots_service.cpp	319	60	3
static void DoProfiling() in src/brpc/builtin/hotspots_service.cpp	218	53	3
static bool JsonValueToProtoField() in src/json2pb/json_to_pb.cpp	170	52	5
butil::Status AVCDecoderConfigurationRecord::ParseSPS() in src/brpc/rtmp.cpp	152	51	2
void StatusService::default_method() in src/brpc/builtin/status_service.cpp	202	47	4
void ProcessRpcRequest() in src/brpc/policy/baidu_rpc_protocol.cpp	256	45	1
void ProcessHttpResponse() in src/brpc/policy/http_rpc_protocol.cpp	182	44	1
void RpczService::default_method() in src/brpc/builtin/rpcz_service.cpp	201	42	4
static void DisplayResult() in src/brpc/builtin/hotspots_service.cpp	185	41	5
static bool ReadAMFObjectField() in src/brpc/amf.cpp	114	38	3
void Controller::OnVersionedRPCReturned() in src/brpc/controller.cpp	115	38	3
void ConnectionsService::PrintConnections() in src/brpc/builtin/connections_service.cpp	205	38	5
int pthread_timed_connect() in src/butil/endpoint.cpp	186	38	4
int Server::AddServiceInternal() in src/brpc/server.cpp	202	37	3
static void ParseResponse() in src/brpc/policy/ubrpc2pb_protocol.cpp	159	36	3
void Channel::CallMethod() in src/brpc/channel.cpp	144	36	5
ParseError RedisReply::ConsumePartialIOBuf() in src/brpc/redis_reply.cpp	166	35	1
int stop_and_join() in src/bthread/fd.cpp	215	35	0
void SerializeHttpRequest() in src/brpc/policy/http_rpc_protocol.cpp	145	34	3
void ParallelChannel::CallMethod() in src/brpc/parallel_channel.cpp	156	34	5
void Controller::IssueRPC() in src/brpc/controller.cpp	161	33	1
void StackDumpSignalHandler() in src/butil/debug/stack_trace_posix.cc	173	33	3
static void GlobalInitializeOrDieImpl() in src/brpc/global.cpp	240	32	0
void ProcessHuluRequest() in src/brpc/policy/hulu_pbrpc_protocol.cpp	180	31	1
void Socket::DebugSocket() in src/brpc/socket.cpp	256	31	2
int NacosNamingService::GetServerNodes() in src/brpc/policy/nacos_naming_service.cpp	110	30	3
ParseResult RtmpChunkStream::Feed() in src/brpc/policy/rtmp_protocol.cpp	194	30	3
void SendRpcResponse() in src/brpc/policy/baidu_rpc_protocol.cpp	149	30	6
int URI::SetHttpURL() in src/brpc/uri.cpp	85	30	1
size_t TsPayloadPES::ByteSize() in src/brpc/ts.cpp	44	29	0
bool Buffer::IToASCII() in src/butil/strings/safe_sprintf.cc	86	29	7
int main() in example/selective_echo_c++/client.cpp	134	29	2
static bool ReadAMFObjectField() in src/brpc/amf.cpp	85	28	3
static bool ReadAMFArrayItem() in src/brpc/amf.cpp	83	28	2
static int ExtractSymbolsFromBinary() in src/brpc/builtin/pprof_service.cpp	91	28	2
bool PbToJsonConverter::Convert() in src/json2pb/pb_to_json.cpp	90	27	3
int Server::AddBuiltinServices() in src/brpc/server.cpp	103	27	0
void UbrpcAdaptor::ParseNsheadMeta() in src/brpc/policy/ubrpc2pb_protocol.cpp	118	26	4
void File::InitializeUnsafe() in src/butil/files/file_posix.cc	67	26	2
bool RtmpChunkStream::OnCreateStream() in src/brpc/policy/rtmp_protocol.cpp	134	25	3
void FlagsService::default_method() in src/brpc/builtin/flags_service.cpp	104	25	4
void AppendFileName() in src/brpc/builtin/common.cpp	70	25	2
static bool generate_parsing() in src/mcpack2pb/generator.cpp	378	25	4
ParseResult InputMessenger::CutInputMessage() in src/brpc/input_messenger.cpp	80	24	3
void Controller::Call::OnComplete() in src/brpc/controller.cpp	62	24	4