[LLVMdev] How to write a custom LTO pass?

[John Criswell]

On 5/18/15 2:16 PM, Stephen Thomas wrote:
> I'd like to write an inter-modular analysis pass. My understanding is 
> that this should take the form of an LTO pass. However, I have been 
> unable to find any resources on the mechanics of writing and running a 
> custom LTO pass. Does anyone have any pointers?

All you need to do is to write a ModulePass and modify the libLTO plugin 
to run it.  Writing a ModulePass is described in the "How to Write an 
LLVM Pass" document in the LLVM documentation.  To modify libLTO, you'll 
need to read the documents on how to install it, and you'll need to 
modify the plugin (in llvm/tools/LTO, I think). Alternatively, you can 
modify the LLVM library that defines which passes get run when you use 
-O2 and -flto optimization, but the result is the same: you'll need to 
install a new libLTO plugin.

Regards,

John Criswell

>
> Thanks,
> Steve
>
>
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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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