llvm dev - Oct 2013 - [LLVMdev] A way to write new pass by keeping source and build directories separate

Hi,

I was trying to write a sample optimization pass in LLVM, by following
instructions in LLVM doc for Writing a New Pass. But then ran into
*make*issues. The issue is with having separate
*source *and *build* directories. The LLVM doc for 'Getting Started'
suggests keeping the two separate, but the 'Writing a new pass' doc
assumes
they are merged. Hence the *make *issue.

I did a bit of googling and could not find a desired solution. The
solutions proposed were to combine the *source* and *build* directories.

I am happy to say that I could find a solution with keeping *source *and *build
*directories separate, as desired. I thought I could share it with newbies
like me.

  0. Download LLVM source into /llvm-src and build it into /llvm-build
directories.
  1. Write a new pass and Makefile as mentioned in LLVM doc 'Writing a new
pass'. Assume it is created in /llvm-src/lib/Transforms/NewPass directory.
  2. Modify the Makefile in /llvm-src/lib/Transforms directory by adding
NewPass under PARALLEL_DIRS.
  3. *make* in /llvm-build directory.
  4. Thats it. If things go fine, newpass.so will be created in
/llvm-build/Debug+Asserts/lib directory.
  5. The new pass can be loaded by modifying the command mentioned in the
LLVM doc (for Writing a new pass) as


opt -load /llvm-build/Debug+Asserts/lib/newpass.so -newpass <
hello.bc
> /dev/null
Hope this helps.

-- 
Rekha
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On Oct 3, 2013 11:47 PM, "Rekha R" <rekharamapai at nitc.ac.in>
wrote:
>
> Hi,
>
> I was trying to write a sample optimization pass in LLVM, by following
instructions in LLVM doc for Writing a New Pass. But then ran into make
issues. The issue is with having separate source and build directories. The
LLVM doc for 'Getting Started' suggests keeping the two separate, but
the
'Writing a new pass' doc assumes they are merged. Hence the make
issue.
>
> I did a bit of googling and could not find a desired solution. The
solutions proposed were to combine the source and build
directories.
>
> I am happy to say that I could find a solution with keeping source and
build directories separate, as desired. I thought I could share it with
newbies like me.
>
>   0. Download LLVM source into /llvm-src and build it into /llvm-build
directories.
>   1. Write a new pass and Makefile as mentioned in LLVM doc 'Writing a
new pass'. Assume it is created in /llvm-src/lib/Transforms/NewPass
directory.
>   2. Modify the Makefile in /llvm-src/lib/Transforms directory by adding
NewPass under PARALLEL_DIRS.
>   3. make in /llvm-build directory.
>   4. Thats it. If things go fine, newpass.so will be created in
/llvm-build/Debug+Asserts/lib directory.
>   5. The new pass can be loaded by modifying the command mentioned in the
LLVM doc (for Writing a new pass) as
>
>
> opt -load /llvm-build/Debug+Asserts/lib/newpass.so -newpass < hello.bc
>
/dev/null
>
> Hope this helps.
>
> --
> Rekha
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
A long ago I've added support for developing passes outside source dir for
CMake build system. There should be documentation on this.
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thank you for the info.

Rekha


On Fri, Oct 4, 2013 at 10:22 AM, arrowdodger <6yearold at gmail.com>
wrote:
> On Oct 3, 2013 11:47 PM, "Rekha R" <rekharamapai at
nitc.ac.in> wrote:
> >
> > Hi,
> >
> > I was trying to write a sample optimization pass in LLVM, by following
> instructions in LLVM doc for Writing a New Pass. But then ran into make
> issues. The issue is with having separate source and build directories. The
> LLVM doc for 'Getting Started' suggests keeping the two separate,
but the
> 'Writing a new pass' doc assumes they are merged. Hence the make
issue.
> >
> > I did a bit of googling and could not find a desired solution. The
> solutions proposed were to combine the source and build directories.
> >
> > I am happy to say that I could find a solution with keeping source and
> build directories separate, as desired. I thought I could share it with
> newbies like me.
> >
> >   0. Download LLVM source into /llvm-src and build it into /llvm-build
> directories.
> >   1. Write a new pass and Makefile as mentioned in LLVM doc
'Writing a
> new pass'. Assume it is created in /llvm-src/lib/Transforms/NewPass
> directory.
> >   2. Modify the Makefile in /llvm-src/lib/Transforms directory by
adding
> NewPass under PARALLEL_DIRS.
> >   3. make in /llvm-build directory.
> >   4. Thats it. If things go fine, newpass.so will be created in
> /llvm-build/Debug+Asserts/lib directory.
> >   5. The new pass can be loaded by modifying the command mentioned in
> the LLVM doc (for Writing a new pass) as
> >
> >
> > opt -load /llvm-build/Debug+Asserts/lib/newpass.so -newpass <
hello.bc >
> /dev/null
> >
> > Hope this helps.
> >
> > --
> > Rekha
> >
> > _______________________________________________
> > LLVM Developers mailing list
> > LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
> >
>
> A long ago I've added support for developing passes outside source dir
for
> CMake build system. There should be documentation on this.
>


-- 
Rekha
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Thanks Rekha, I stumbled upon exactly the same problem, your post saved my
time.

Regards
Umer


On Thu, Oct 3, 2013 at 9:45 PM, Rekha R <rekharamapai at nitc.ac.in>
wrote:
> Hi,
>
> I was trying to write a sample optimization pass in LLVM, by following
> instructions in LLVM doc for Writing a New Pass. But then ran into
*make*issues. The issue is with having separate
> *source *and *build* directories. The LLVM doc for 'Getting
Started'
> suggests keeping the two separate, but the 'Writing a new pass' doc
assumes
> they are merged. Hence the *make *issue.
>
> I did a bit of googling and could not find a desired solution. The
> solutions proposed were to combine the *source* and *build* directories.
>
> I am happy to say that I could find a solution with keeping *source *and
*build
> *directories separate, as desired. I thought I could share it with
> newbies like me.
>
>   0. Download LLVM source into /llvm-src and build it into /llvm-build
> directories.
>   1. Write a new pass and Makefile as mentioned in LLVM doc 'Writing a
new
> pass'. Assume it is created in /llvm-src/lib/Transforms/NewPass
directory.
>   2. Modify the Makefile in /llvm-src/lib/Transforms directory by adding
> NewPass under PARALLEL_DIRS.
>   3. *make* in /llvm-build directory.
>   4. Thats it. If things go fine, newpass.so will be created in
> /llvm-build/Debug+Asserts/lib directory.
>   5. The new pass can be loaded by modifying the command mentioned in the
> LLVM doc (for Writing a new pass) as
>
>
> opt -load /llvm-build/Debug+Asserts/lib/newpass.so -newpass < hello.bc
> /dev/null
>
> Hope this helps.
>
> --
> Rekha
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
>
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