llvm dev - Mar 2020 - Passing arguments to LLVM pass through Clang

Hello,

I am adding to an LLVM pass that requires a filename as input. I am able to
input this filename as a command line argument when I invoke this pass
using opt, but I ultimately need to pass this argument to my code when I
compile code with clang.

How can I pass this argument to clang so that I can use it in my LLVM pass?
Thanks for your help!

Best,
Shishir Jessu
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Hello Shishir,

To pass arguments to LLVM from clang, use something like `clang source.c -mllvm
-customarg -mllvm argvalue`. The -mllvm argument tells clang to forward the
following argument to LLVM. Similarly, there is the -Xclang argument to pass the
following argument to clang proper, as opposed to the clang driver.

Cheers,
Benno

Am 16.03.2020 um 23:45 schrieb Shishir V Jessu via llvm-dev <llvm-dev at
lists.llvm.org<mailto:llvm-dev at lists.llvm.org>>:

Hello,

I am adding to an LLVM pass that requires a filename as input. I am able to
input this filename as a command line argument when I invoke this pass using
opt, but I ultimately need to pass this argument to my code when I compile code
with clang.

How can I pass this argument to clang so that I can use it in my LLVM pass?
Thanks for your help!

Best,
Shishir Jessu
[https://my-email-signature.link/signature.gif?u=452460&e=89920299&v=06d9a9b1e5d7f6685284ae9f5a944df07b26d3dc9391d3cecc31b2e77d4f5d20]
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Hi Benno,

Thanks for your response! Unfortunately, I don't think the -mllvm flag is
doing what I need.

Specifically, I am adding to the LowerTypeTests optimization pass in LLVM.
When I invoke this pass with opt, there is a command line option called "
lowertypetests-read-summary", which allows me to specify a file name.
I've
added a similar option, that takes a filename as input and opens that file
to obtain some information necessary to do the pass.

It looks like -lowertypetests is not a pass that -mllvm recognizes, so I'm
not able to input arguments to this pass using -mllvm. In fact, it doesn't
seem like *any* of the passes that -mllvm recognizes can be invoked
with opt. Do
you know if there's some code I can modify that will allow -mllvm to
recognize this pass? Or is there a better way to get clang to send the
filename input to my pass? Thanks so much for your help!

Best,
Shishir Jessu



On Tue, Mar 17, 2020 at 2:48 AM Benno Krauss <benno.krauss at wibu.com>
wrote:
> Hello Shishir,
>
> To pass arguments to LLVM from clang, use something like `clang source.c
> -mllvm -customarg -mllvm argvalue`. The -mllvm argument tells clang to
> forward the following argument to LLVM. Similarly, there is the -Xclang
> argument to pass the following argument to clang proper, as opposed to the
> clang driver.
>
> Cheers,
> Benno
>
> Am 16.03.2020 um 23:45 schrieb Shishir V Jessu via llvm-dev <
> llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>>:
>
> Hello,
>
> I am adding to an LLVM pass that requires a filename as input. I am able
> to input this filename as a command line argument when I invoke this pass
> using opt, but I ultimately need to pass this argument to my code when I
> compile code with clang.
>
> How can I pass this argument to clang so that I can use it in my LLVM
> pass? Thanks for your help!
>
> Best,
> Shishir Jessu
> [
>
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> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
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