[llvm-dev] MachineModule pass

[John Criswell via llvm-dev]

Dear Fami,

Currently, there is no MachineModulePass in LLVM.

There was recently a discussion on the list about adding such a pass.  
Other LLVM users and myself are interested in such an infrastructure.  
You can search for that discussion on the LLVM Developer's mailing list 
archives.

Regarding your specific inquiry, you may be able to get what you want 
without a MachineModulePass.  Right now, it sounds like you are thinking 
of the entire program as one large control flow graph.  However, the 
LLVM IR (and MachineInstr IR) do not represent code that way.  Each 
function has its own control flow graph; the basic blocks within these 
graphs may call to (and return from) other functions.

Most likely, you can adjust your analysis so that it uses loop analysis 
for local control flow and call graph analysis for inter-procedural 
control flow.  In other words, it may not be necessary to view the 
entire program as one big control flow graph for your purposes.

Regards,

John Criswell


On 1/29/16 6:52 PM, fateme Hoseini via llvm-dev wrote:
> Hello everyone,
> As I mentioned in my previous posts,I am using a machinefunction pass 
> to find all the loops in the program and do some analysis on them. I 
> have completed my pass now and it works correctly. but the only issue 
> is that,I have noticed that if I have two functions in my program, and 
> one of them is part of the loop for another one ,by using 
>  runonmachinefunction(), I will get one loop per each function. 
> whereas the correct result is to find one loop at depth 1 and the 
> other one at depth 2 as an inner loop.
> In order to get this result, I am trying to use write a MachineModule 
> Pass, but I can't seem to find any MachineModule.h in codegen. Right 
> now, is this even possible to write a machinemodule pass? If not what 
> other options do I have to get the results I need.
> Thank you,
> Fami
>
>
>
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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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