[LLVMdev] How to write a custom LTO pass?

[jls]

It works in debug mode.  I left the std::cout statements in and compiled in 
sim mode.  ir2v aborted.  

A similar abort happened with more than 8 memcpy's to cpu_ptrs.  I don't know if 
there are other limits we should be diagnosing or documenting.  

-jon

On May 18, 2015, at 2:34 PM, John Criswell wrote:

> 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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