functions trace

http://www.logix.cz/michal/devel/CygProfiler/

CygProfiler is a set of functions for use with gcc's -finstrument-functions option. See info page of gcc for details and description of this option.

To use it, compile your program with -finstrument-functions and link together with cyg-profile.c. Somewhere at the beginning of the program call cygprofile_enable() to start logging all function entries and exits into a logfile.

By default the name of the logfile is cyglog.$PID, but you can set a different one using cygprofile_setfilename(). To get current logfile name use cygprofile_getfilename(). To see if logging is enabled use cygprofile_isenabled(). You can stop logging by calling cygprofile_disable().

Note that subsequent enabling of logging will overwrite the previous log with the same name!

After you have created a logfile run cyg-resolve.pl with the program name that created the logfile as a first argument and the logfile name as a second argument. On stdout you'll see a log of all instrumentalized functions invoked while logging was enabled.

用 Graphviz 可视化函数调用

http://www.ibm.com/developerworks/cn/linux/l-graphvis/

为了捕获并显示调用图，您需要 4 个元素：GNU 编译器工具链、Addr2line 工具、定制的中间代码和一个名为 Graphviz 的代码。Addr2line 工具可以识别函数、给定地址的源代码行数和可执行映像。定制的中间代码是一个非常简单的工具，它可以减少对图形规范的地址跟踪。Graphviz 工具可以生成图形映像。整个过程如图 1 所示。