[LLVMdev] Creating and implementing an analysis group out of tree

[Eli Bendersky]

On Thu, Jun 12, 2014 at 1:46 PM, Jeremy Salwen <jeremysalwen at gmail.com>
wrote:

> Hi Eli,
>
> Thanks for the link! I'm able to compile a standalone pass outside of the
> source tree, and I'm obviously ably to compile analysis groups inside the
> source tree.  However, the problem comes when I try to do what the tutorial
> suggests to create an analysis group outside of the source tree.
>
> My understanding is that building out of tree requires different methods
> to register the passes.
>

I don't think so; or I may be misunderstanding what you mean by "out of
tree"?


> For example, the class RegisterPass, which the tutorial instructs you to
> use (and is used by sample repository you linked), never shows up in the
> source tree.  Likewise for RegisterAnalysisGroup.
>

What makes you say that? Both appear there.


> Furthermore I've found that just copying the way it's done in the source
> tree and not using RegisterPass causes opt to not recognize your
> command-line arguments.
>
> Do you know of any other projects that will demonstrate how to build
> passes out of tree, only creating an analysis group as well?
>
>
Nope, sorry.

Eli




> Thanks
> Jeremy
>
>
> On Thu, Jun 12, 2014 at 4:20 PM, Eli Bendersky <eliben at google.com> wrote:
>
>>
>>
>>
>> On Thu, Jun 12, 2014 at 1:10 PM, Jeremy Salwen <jeremysalwen at gmail.com>
>> wrote:
>>
>>> Hello all,
>>>
>>> I'm trying to follow the guide
>>> http://llvm.org/docs/WritingAnLLVMPass.html to build an some passes and
>>> analysis groups out of tree. However, I'm having some trouble with crashes
>>> when I try to follow the guide.
>>> The first section provides a very useful example of what the whole .cpp
>>> file should look like for the HelloWorld pass.  Obviously it's a bit more
>>> complex to write the whole setup with an analysis group, an analysis pass,
>>> and a transform pass that uses the analysis, but example code would be
>>> extremely helpful, and could serve as a good starting point for anyone who
>>> wants to do something similar.  Is there anywhere i could find such example
>>> code, perhaps as part of a project, that demonstrates how to define and use
>>> an analysis group out of tree?
>>>
>>
>> It's not entirely clear which part you're having a problem with. If it's
>> creating an analysis group, there should be samples within the LLVM source
>> code. If it's building out-of-tree, take a look at
>> https://github.com/eliben/llvm-clang-samples -- it's a repository with a
>> bunch of LLVM/Clang samples, all built out of tree. It keeps pretty close
>> track to ToT, as well as having branches for prior releases (3.3 and 3.4,
>> for now).
>>
>> Eli
>>
>>
>>
>
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