alibaba / PhotonLibOS - 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).

Learn more...

Conditional Complexity Overall

There are 5,379 units with 32,500 lines of code in units (56.2% of code).

0 very complex units (0 lines of code)
2 complex units (180 lines of code)
33 medium complex units (1,468 lines of code)
165 simple units (4,303 lines of code)
5,179 very simple units (26,549 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
static int do_ext2fs_rename() in fs/extfs/extfs.cpp	77	29	3
int init() in io/iouring-wrapper.cpp	103	27	1
int get_cookies_from_headers() in net/http/cookie_jar.cpp	59	25	1
FORCE_INLINE __m128d _mm_round_pd() in common/checksum/sse2neon.h	55	23	2
virtual ssize_t pwritev2_mutable() in fs/aligned-file.cpp	69	22	4
virtual ssize_t pwrite() in fs/aligned-file.cpp	46	21	3
FORCE_INLINE __m128 _mm_round_ps() in common/checksum/sse2neon.h	54	20	2
int do_roundtrip() in net/http/client.cpp	71	20	2
int wait_completion() in rpc/out-of-order-execution.cpp	92	19	1
static int do_ext2fs_mknod() in fs/extfs/extfs.cpp	72	18	4
int call() in net/http/client.cpp	44	18	1
FORCE_INLINE __m128 _mm_dp_ps() in common/checksum/sse2neon.h	36	16	3
virtual int add_interest() in io/epoll.cpp	45	15	1
void wait_for_events() in io/epoll.cpp	36	15	3
int invalid_uuid4() in common/uuid4.cpp	16	15	1
void deallocate_tls() in thread/thread-key.cpp	44	15	1
static int fire_signal() in io/signal.cpp	72	14	2
int add_interest() in io/fstack-dpdk.cpp	23	13	1
int add_interest() in io/kqueue.cpp	23	13	1
virtual int rm_interest() in io/epoll.cpp	25	12	1
ssize_t wait_and_fire_events() in io/iouring-wrapper.cpp	42	12	1
ssize_t submit_and_wait() in io/aio-wrapper.cpp	48	12	1
static int do_ext2fs_rmdir() in fs/extfs/extfs.cpp	36	12	2
static int do_ext2fs_link() in fs/extfs/extfs.cpp	40	12	3
int handle_request() in net/http/server.cpp	54	12	3
void URL::from_string() in net/http/url.cpp	60	12	1
FORCE_INLINE __m128d _mm_dp_pd() in common/checksum/sse2neon.h	49	11	3
int Walker::next() in fs/path.cpp	45	11	0
ssize_t preadv() in fs/httpfs/httpfs_v2.cpp	32	11	3
int fstat() in fs/httpfs/httpfs_v2.cpp	19	11	1
static int do_ext2fs_symlink() in fs/extfs/extfs.cpp	37	11	3
int __photon_init() in photon.cpp	44	11	3
virtual int serve() in rpc/rpc.cpp	46	11	1
int set_cookies_to_headers() in net/http/cookie_jar.cpp	27	11	1
static bool isunreserved() in net/http/url.cpp	7	11	1
ssize_t wait_for_events() in io/iouring-wrapper.cpp	41	10	3
int fstack_connect() in io/fstack-dpdk.cpp	26	10	4
static void crc_init() in common/checksum/crc.cpp	29	10	0
FORCE_INLINE void _mm_prefetch() in common/checksum/sse2neon.h	35	10	2
FORCE_INLINE __m128i _mm_mpsadbw_epu8() in common/checksum/sse2neon.h	72	10	3
int run_fuse() in fs/fuse_adaptor.cpp	56	10	4
int fstat() in fs/httpfs/httpfs.cpp	17	10	1
static ext2_file_t do_ext2fs_open_file() in fs/extfs/extfs.cpp	36	10	4
static int do_ext2fs_mkdir() in fs/extfs/extfs.cpp	34	10	3
static ssize_t do_ext2fs_readlink() in fs/extfs/extfs.cpp	30	10	4
void semaphore::try_resume() in thread/thread.cpp	25	10	1
RSockFD accept() in net/rsocket/rsocket.cpp	26	10	3
virtual ssize_t read() in net/http/body.cpp	17	10	2
int connect() in net/basic_socket.cpp	27	10	4
virtual int add_interest() in io/epoll-ng.cpp	22	9	1