llvm dev - Jun 2014 - [LLVMdev] Creating and implementing an analysis group out of tree

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?

Thanks,
Jeremy
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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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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.  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.  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?

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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