[LLVMdev] CFG extraction

[Tobias Grosser]

On 10/12/2010 07:02 AM, hamed hamzehi wrote:
> Hello,
>
> I would like to extract Control Flow Graph and Data Flow Graph from a
> sample program written in C++, Can anybody please direct me to some
> examples?
> Thanks in advance

Hi,

to get the CFG's use this command.

clang++ -S -emit-llvm program.cpp
opt -view-cfg program.s

This needs the graphviz package to be installed as the dotty program is 
called.

To just extract the dot files of the CFG use:

opt -dot-cfg program.s

If you use -dot-cfg-only -view-cfg-only the CFG does not contain the 
statements of each bb.

I do not know if there is any DataFlowGraph available in LLVM.

Cheers
Tobi