[LLVMdev] indirect calls tracking and control flow graph

[Amara Emerson]

Hi Thanasis,

You should be able to do this easily by writing a FunctionPass (see
http://llvm.org/docs/WritingAnLLVMPass.html for more info) and
iterating over the instructions in the function, searching for
CallInst instructions and using getCalledFunction() to check if it's
indirect.

Amara

On 28 April 2014 14:10, Petsas Athanasios <petsas at ics.forth.gr> wrote:
> Dear all,
>
> I would like to keep track of all the indirect calls that may caused from
> function
> pointers inside a program. I need this in order to be able to construct the
> control
> flow graph of all the indirect calls, that is which function is legal to
> call another
> function.
>
> Is there a module that implements this functionality in llvm? If not, is
> there a way to
> do it? Maybe through implementing a pass. I am new to llvm. Could you
> suggest me
> a way to start doing this? Perhaps the llvm intermediate code can help me on
> this.
> Do you know where this code is being produced? or what files or passes do I
> have
> to modify for this?
>
> Until now I have used this command to produce and study the llvm bitcode for
> a test
> program:
> clang -S -emit-llvm fpointers.c -c -o fpointers.bc.text
>
> Thank you,
>
> --
> Thanasis Petsas
> Distributed Computing Systems (DCS)
> Institute of Computer Science (ICS/FORTH)
> Heraklion, Crete
> Greece (GR)
>
> http://www.thanasispetsas.com/
>
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