apache / qpid-proton - 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 4,838 units with 42,783 lines of code in units (61.9% of code).

7 very complex units (1,494 lines of code)
29 complex units (2,509 lines of code)
132 medium complex units (6,647 lines of code)
298 simple units (7,240 lines of code)
4,372 very simple units (24,893 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
int pn_data_vscan() in c/src/core/codec.c	379	135	3
static int pni_decoder_decode_value() in c/src/core/decoder.c	243	96	3
func unmarshal() in go/pkg/amqp/unmarshal.go	211	75	2
bool pni_tls_validate() in c/src/tls/openssl.c	108	65	1
int pn_data_appendn() in c/src/core/codec.c	150	63	3
int pn_data_vfill() in c/src/core/codec.c	214	62	3
static HRESULT verify_peer() in c/src/ssl/schannel.cpp	189	59	4
static int pni_encoder_enter() in c/src/core/encoder.c	81	44	3
static bool poller_do_epoll() in c/src/proactor/epoll.c	124	43	3
static inline pn_type_t pn_code2type() in c/src/core/decoder.c	73	41	1
def parse_item() in c/tools/codec-generator/generate.py	86	38	1
func() in go/pkg/proton/wrappers_gen.go	79	38	1
static inline bool consume_atom() in c/src/core/consumers.h	138	37	2
static ssize_t process_input_ssl() in c/src/ssl/schannel.cpp	112	36	4
pni_protocol_type_t pni_sniff_header() in c/src/core/autodetect.c	31	35	2
bool pni_raw_validate() in c/src/proactor/raw_connection.c	47	35	1
func marshal() in go/pkg/amqp/marshal.go	102	35	2
void pni_inspect_atom() in c/src/core/codec.c	146	34	2
int pn_messenger_process_events() in c/src/messenger/messenger.c	68	32	1
int pn_do_transfer() in c/src/core/transport.c	115	32	4
void pn_value_dump_scalar() in c/src/core/value_dump.c	140	31	3
container::impl::dispatch_result container::impl::dispatch() in cpp/src/proactor_container_impl.cpp	142	31	1
static ssize_t process_output_ssl() in c/src/ssl/openssl.c	91	30	4
static void parse_options() in c/tools/reactor-send.c	82	29	3
static ssize_t process_input_ssl() in c/src/ssl/openssl.c	108	29	4
int getopt() in c/tools/include/pncompat/internal/getopt.c	107	28	3
static void parse_options() in c/tools/msgr-send.c	76	28	3
static void decrypt() in c/src/tls/openssl.c	72	28	1
bool default_sasl_process_mechanisms() in c/src/sasl/default_sasl.c	63	27	2
int compare_next() in cpp/src/value.cpp	41	27	2
static void parse_options() in c/tools/msgr-recv.c	66	26	3
static void server_handshake() in c/src/ssl/schannel.cpp	131	26	1
static void encrypt() in c/src/tls/openssl.c	62	26	1
static uint8_t pn_type2code() in c/src/core/encoder.c	33	26	2
func String() in go/pkg/amqp/types.go	56	26	1
std::string type_name() in cpp/src/type_id.cpp	37	26	1
static ssize_t process_output_ssl() in c/src/ssl/schannel.cpp	81	25	4
int pn_messenger_start() in c/src/messenger/messenger.c	63	25	1
void pn_message_inspect() in c/src/core/message.c	133	25	2
static bool handle_raw_connection() in c/experimental/raw_plus_tls2.c	58	25	2
func getInterface() in go/pkg/amqp/unmarshal.go	68	25	2
func() in go/pkg/electron/handler.go	71	25	1
func() in go/pkg/proton/handlers.go	52	24	1
int pn_message_decode() in c/src/core/message.c	105	23	3
ssize_t pn_io_layer_input_autodetect() in c/src/core/transport.c	95	23	4
static int pni_process_tpwork_sender() in c/src/core/transport.c	62	23	3
static void handle_outgoing() in c/experimental/raw_plus_tls2.c	56	23	1
static void handle_incoming() in c/experimental/raw_plus_tls2.c	62	23	2
func mapType() in go/genwrap.go	72	23	1
void on_delivery() in cpp/src/messaging_adapter.cpp	70	23	2