[LLVMdev] Processing functions in call graph SCC "order" with function-level analyses

[Félix Cloutier]

Thanks John.

Does this solve the problem of analysis availability though? If I still have to run the function analyses manually, I might as well keep rolling with the CallGraphSCCPass. (I probably should have mentioned that this is what I’m using right now.)

Félix

> Le 2015-05-19 à 10:12:32, John Criswell <jtcriswel at gmail.com> a écrit :
> 
> On 5/18/15 10:45 PM, Félix Cloutier wrote:
>> Hi all,
>> 
>> I have one analysis pass that I want to perform on call graph SCCs. However, for each function in the SCC, I need function-level analyses, like the dominator tree and the memory dependency analysis.
>> 
>> I’ve been told before <http://stackoverflow.com/questions/30059622/using-dominatortreewrapperpass-in-callgraphsccpass> that these were not available from a CallGraphSCCPass. What would be the best approach for me to access this information? Should I run the passes manually, or is there another, more pass-scheduler-friendly approach?
> 
> I would write a ModulePass that simply iterates over the call graph.  LLVM provides a CallGraph analysis which one can use to find SCCs; DSA has an analysis called CallTargets which does "real" CallGraph analysis (which means that it tries to reason about function pointers, though I cannot guarantee that its reasoning will be as accurate as you want).
> 
> If you use a ModulePass, can you analyze any part of the program you like, and you can use FunctionPasses.
> 
> Regards,
> 
> John Criswell
> 
>> 
>> Félix
>> 
>> 
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> 
> -- 
> John Criswell
> Assistant Professor
> Department of Computer Science, University of Rochester
> http://www.cs.rochester.edu/u/criswell <http://www.cs.rochester.edu/u/criswell>
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