[cfe-dev] Extracting llvm IR CFG from Clang

[John Criswell via cfe-dev]

On 2/15/16 8:57 PM, xiaohui chen via cfe-dev wrote:
> Dear All:
>
> I am working on Clang/LLVM and interested to know if there is a 
> programmatic way to extract the CFG of a specific
> node in AST like a for loop?
>
>  I am aware of |-emit-llvm|option, but it will apply on the whole TU.
>
> For example,
> we could use CFG::buildCFG to extract the source level CFG of a 
> specific node.
> Is there a counterpart API to extract the LLVM IR level CFG of a 
> specific node?

The LLVM IR expresses each function as a set of basic blocks with an 
explicit CFG.  In other words, the LLVM IR encodes the CFG of each 
function explicitly.  If you have the LLVM IR of a function, you already 
have the CFG.

Regards,

John Criswell

>
> Sincerely
> xiaohui
>
>
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-- 
John Criswell
Assistant Professor
Department of Computer Science, University of Rochester
http://www.cs.rochester.edu/u/criswell

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