llvm dev - Aug 2016 - Can I write LLVM pass using add_llvm_library, not add_llvm_loadable_module?

I'd write new transform pass related to some function optimization, and
contribute it into LLVM. But Writing an LLVM Pass
<http://llvm.org/docs/WritingAnLLVMPass.html> was described only using as
dynamic LLVM loadable modules (.so extensions).

I want to write LLVM pass using add_llvm_library, not
add_llvm_loadable_module in CMakeLists.txt. Can I do it? If yes, how?
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Yes you can put a pass in a static or shared library rather than a module. It
largely depends on how you want to have it consumed. Using a loadable module is
the least intrusive way to create an out-of-tree pass, so that is how the pass
tutorial is written. If you use a static archive you’ll need to modify the build
system to link your pass into all the tools you wish to use it from. There is
very little technical difference between a shared library and a module, but the
build system treats them differently because they have different impact on the
dependency graph because a runtime loaded module does not need to exist in order
to link binaries that depend on it.

-Chris
> On Aug 27, 2016, at 2:11 PM, Donghyeon Lee via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
> 
> I'd write new transform pass related to some function optimization, and
contribute it into LLVM. But Writing an LLVM Pass
<http://llvm.org/docs/WritingAnLLVMPass.html> was described only using as
dynamic LLVM loadable modules (.so extensions).
> 
> I want to write LLVM pass using add_llvm_library, not
add_llvm_loadable_module in CMakeLists.txt. Can I do it? If yes, how?
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
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Polly (polly.llvm.org) creates both, a loadable module, and if built
in the tools/polly directory, by default also linked to opt/clang. You
might look into Polly's source for how it is done (primarily
lib/CMakeLists.txt and lib/Polly.cpp)

Michael

2016-08-27 23:11 GMT+02:00 Donghyeon Lee via llvm-dev <llvm-dev at
lists.llvm.org>:
> I'd write new transform pass related to some function optimization, and
> contribute it into LLVM. But Writing an LLVM Pass was described only using
> as dynamic LLVM loadable modules (.so extensions).
>
> I want to write LLVM pass using add_llvm_library, not
> add_llvm_loadable_module in CMakeLists.txt. Can I do it? If yes, how?
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>

You probably don't want to add a new directory? In this case, the easiest
would be to take an existing file and implement by analogy.

/lib/Transforms/Scalar/ConstantProp.cpp is a good example. The relevant
lines are 53-62. Note that createConstantPropagation function is called
outside -- grep it and add a call to your own pass creator. Also, you
should add your file to relevant CMakeLists.txt.

Yours,
Andrey


On Sun, Aug 28, 2016 at 12:11 AM, Donghyeon Lee via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> I'd write new transform pass related to some function optimization, and
> contribute it into LLVM. But Writing an LLVM Pass
> <http://llvm.org/docs/WritingAnLLVMPass.html> was described only
using as
> dynamic LLVM loadable modules (.so extensions).
>
> I want to write LLVM pass using add_llvm_library, not
> add_llvm_loadable_module in CMakeLists.txt. Can I do it? If yes, how?
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
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