Doxygen graphviz call graph11/18/2023 ![]() ![]() In my case, D is a member function of a class whose object will be wrapped within a smart pointer. I have tried Codeviz and Doxygen, somehow both results show nothing but callees of target function, D. Update - The call graphs can also be generated using doxygen by enabling it in its configuration file before running it on the source tree.I'm trying to generate calling graph with which to find out all the possible execution paths that are hitting a particular function (so that I don't have to figure out all the paths manually, as there are many paths that lead to this function). Note - The discussion on this page is for generating call graph for code written in c only. The call graph for module.c itself is quite large, making it difficult to interpret using traditional tools. It may not be a wise idea anyway to generate a call graph for the entire kernel. Only when I added the flag to make file in "/kernel/" director, the expand files for the c-files in the directory were generated. I tried adding "-fdump-rtl-expand" flag in the Makefile present in the root of source, exporting CFLAGS, CCFLAGS, etc. Note - My various attempts to generate expand files for code in every directory of Linux source failed. LD_PRELOAD, and LD_DEBUG - Link1, Link2, also see its usage in ftracer.gprof2dot - This is a Python script to convert the output from many profilers into a dot graph.ftracer - A toolkit for tracing C/C++ program(including multi-thread program), it can generate a call graph for you.can be specified by passing command-line arguments to dot. Look at dot's man page, it contains a plethora of options that can be used to customized various aspects of the graph, Things like graph size, rotation etc. Compiling c code with -fdump-rtl-expand flag set.Įgypt module.c.192r.expand |awk ''|dot -Tsvg -o module_callgraph_coloured.svg.Generating a call graph is a 3 step process. This blog post of mine, is written to add additional insights I got while following the instructions over there. Note - I learnt about generating call graphs from this page. I will start with explaining how to generate the call graph of a simple c program, then we will move forward to generate call graphs of "module.c" present in "/kernel/module.c". This is when the idea of generating and analysing call graphs struck me. Both these functions call "load_module()" defined in the same file, which was the centre of my research. The former is the older system call and expects a binary elf image of the module to be supplied to it. This is useful when authenticity of the module can be determined from its location in the file system. The latter function was added in Linux 3.8, and allows loading module using the file descriptor of the module's file. As a side note, the following two functions are the main system calls which are used by tools like insmod, modprobe, etc. After spending a lot of time rummaging through code of "kernel/module.c" in the Linux source file using ctags, cscope, and vim, I could only discover a few functions. Recently I was trying to analyse the manner in which kernel modules get installed in a Linux kernel. ![]()
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