The cflow
command in Linux is a command-line tool that generates a call graph of C or C++ programs. The tool reads the source code of a program, and generates a graph that shows the call relationships among functions in the program. The graph is output in a variety of formats, including plain text, PostScript, and Graphviz’s dot format.
cflow
is a useful tool for understanding the structure and organization of large, complex programs, and for identifying areas where code can be refactored or optimized.
Here are some examples of how to use the cflow
command:
cflow main.c
: This command will generate a call graph of the C program in the file main.c and display it on the terminal.cflow -b main.c
: This command will generate a call graph as before, but will also include macro expansions in the outputcflow -o graph.dot main.c
: This command will generate a call graph in the Graphviz’s dot format and save it to the file ‘graph.dot’cflow -n main.c
: This command will generate a call graph, but only include functions defined in the input file and exclude system functions
It is also possible to specify multiple source files as input for cflow
, for example cflow file1.c file2.c
It’s important to note that cflow
is not always installed by default in the system, you may need to install it first before using it.
Also, cflow
is only useful for C and C++ language, if you want a similar tool for other languages like python and java, try using pycallgraph
and javacallgraph
respectively.
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