cflow察看工程函数调用关系+Linux 0.11 内核实验环境

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本文介绍了使用cflow工具分析C语言程序中的函数调用关系，并通过callgraph自动化流程将这些信息转换为可视化的SVG图像文件。具体步骤包括安装所需软件包、配置cflow、利用tree2dotx进行格式转换及最终生成SVG图像。

http://savannah.gnu.org/projects/cflow

http://tinylab.org/linux-0.11-lab/

http://ftp.gnu.org/gnu/cflow/

https://github.com/tinyclub

http://www.tinylab.org/callgraph-draw-the-calltree-of-c-functions/

1.cflow版本:   //Calltree 不更新了，CFLOW还在更新中
./configure
make
make install


Version 1.5 available
     posted by gray, Mon 16 May 2016 09:39:12 PM UTC - 0 replies

GNU cflow version 1.5 is available for download.

Changes in this release:

    Correctly handle functions returning struct/union (fixes bug #31792)
    Gracefully handle invalid inputs (fixes bug #44113)
    Debugging output goes to stderr
    Add a manpage
    Consistent use of exit codes

Version 1.4 released
     posted by gray, Tue 11 Oct 2011 09:08:54 PM UTC - 0 replies

GNU cflow version 1.4 is available for download.

The most important changes in this version are:

    Symbol aliases
    New syntactic class: qualifiers
    Speed up recursive call detection.
    Fix parsing of typedefs after struct.
    Fix the output of branch marks in tree mode.
    Fix processing of static inline functions (RH bug 650716).


 2.yum install graphviz    //得到dot
 3.yum install gawk
 4.tree2dotx (脚本,和gprof2dot.py一样）转换 .DOT图形格式
wget -c https://github.com/tinyclub/linux-0.11-lab/raw/master/tools/tree2dotx

callgraph = cflow + tree2dotx + dot （callgraph自动化这个三个工具)

1.cflow：拿到函数调用关系 (calltree可以互换cflow)

cflow -b -m start_kernel init/main.c > start_kernel.txt

2.tree2dotx: 把函数调用树转换成 dot 格式

cat start_kernel.txt | tree2dotx > start_kernel.dot

3.用 dot 工具生成可以渲染的图片格式

这里仅以 svg 格式为例：

$ cat start_kernel.dot | dot -Tsvg -o start_kernel.svg

[root@server1 l#git clone https://github.com/tinyclub/linux-0.11-lab.git && cd linux-0.11-lab
[root@server1 l#cd tool
[root@server1 l#cp tree2dotx callgraph /usr/local/bin
[root@server1 l#chmod +x /usr/local/bin/{tree2dotx,callgraph}

[root@server1 linux-0.11-lab]# make cg f=main      //Makefile.callgraph 
Func: main
Match: 3
File:
     1  ./init/main.c: * main() use the stack at all after fork(). Thus, no function
     2  ./init/main.c: * won't be any messing with the stack from main(), but we define
     3  ./init/main.c:void main(void)           /* This really IS void, no error here. */
Select: 1 ~ 3 ? 3
File: ./init/main.c
Command: cflow -b  -m main ./init/main.c | /root/soft/linux-0.11-lab/tools//tree2dotx  2>/dev/null | dot -Tsvg -o /root/soft/linux-0.11-lab/tools//../callgraph/main.__init_main_c.svg
cflow:./init/main.c:104: drive_info redefined
cflow:./init/main.c:104: this is the place of previous definition
Target: ./init/main.c: main -> /root/soft/linux-0.11-lab/tools//../callgraph/main.__init_main_c.svg
which: no chromium-browser in (/usr/local/mysql/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin)

图像生成:
[root@server1 callgraph]# pwd
/root/soft/linux-0.11-lab/callgraph
[root@server1 callgraph]# ll
total 28
-rw-r--r-- 1 root root 22196 Jun  8 15:48 main.__init_main_c.svg
-rw-r--r-- 1 root root    34 Jun  8 15:45 Makefile