[LLVMdev] Walking thru CallGraph bottom up

[John Criswell]

On 2/24/15 2:27 PM, Simone Atzeni wrote:
> Hi all,
>
> I would like to create a Pass that given an IR instruction walks starting from that instruction up to the main function
> to identify all the functions call that have been made to call that instruction.
>
> Is it possible? What kind of Pass should I create?

Yes, it is possible.  I think a ModulePass would be most appropriate, 
though a FunctionPass may be alright.

To get the call graph, you can use LLVM's CallGraph analysis.  If you 
need to handle function pointers more accurately than LLVM's internal 
CallGraph analysis does, you can use DSA's CallGraph analysis (which has 
the same interface but may only work with LLVM 3.2 and earlier LLVM 
releases).

-- John T.

>
> Thanks
> Best,
> Simone
>
> Simone Atzeni
> simone.at at gmail.com
> +1 (801) 696-8373
>
>
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-- 
John Criswell
Assistant Professor
Department of Computer Science, University of Rochester
http://www.cs.rochester.edu/u/criswell