llvm dev - Jun 2014 - [LLVMdev] Code generation support in llvm for windows phone

I am talking about Windows Mobile 8 and 8.1 and not CE.
Not sure though that the Windows 8 (ARM NT) is similar to Windows Mobile 8
platform.

I used the following command to generate the obj file
    Llc.exe -mtriple=thumbv7-windows  -filetype=obj  <some_name>.bc

The object file generated in the above object doesn't get linked when I try
to link it with the windows mobile library as it fails to recognize the object
format.  ( Not a valid object file )

Hope I am clear.
~rajat

-----Original Message-----
From: Saleem Abdulrasool [mailto:abdulras at fb.com] 
Sent: Friday, May 16, 2014 11:23 PM
To: Rajat Mahajan
Cc: llvmdev at cs.uiuc.edu
Subject: Re: [LLVMdev] Code generation support in llvm for windows phone


On May 16, 2014, at 6:53 AM, Rajat Mahajan <rmahajan at adobe.com> wrote:
> Hi,
>  
> Is there support available in llc to convert llvm bytecode to Windows
Mobile binary?
> I have tried triples like arm-pc-win32 , thumbv7-window ... but the object
file generated is not getting linked to the windows native project.
> Any pointers will be greatly appreciated?
As Reid mentioned, I have been working on this recently.  Just to make sure that
we are talking about the same environment, I assume that you are talking about
Windows 8 (ARM NT) rather than the Windows CE based environment.

Can you please explain what exactly you mean by "the object file generated
is not getting linked to the windows native project".  The object file that
we generate should be pretty compatible with MSVC.  If you have specific cases
where we are generating something that is incompatible, I would be quite
interested in hearing about that.
> Thanks,
> ~rajat
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu        
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>
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-- 
Saleem Abdulrasool
abdulras (at) fb (dot) com

On May 28, 2014, at 5:18 AM, Rajat Mahajan <rmahajan at adobe.com> wrote:
> I am talking about Windows Mobile 8 and 8.1 and not CE.
> Not sure though that the Windows 8 (ARM NT) is similar to Windows Mobile 8
platform.
> 
> I used the following command to generate the obj file
>    Llc.exe -mtriple=thumbv7-windows  -filetype=obj  <some_name>.bc
> 
> The object file generated in the above object doesn't get linked when I
try to link it with the windows mobile library as it fails to recognize the
object format.  ( Not a valid object file )
> 
> Hope I am clear.
Unfortunately, you have merely repeated your previous statement.  I don’t have
enough here to diagnose nor even speculate what is going on.

If you can provide the object file, it would be helpful as I am unable to
reproduce this issue.  Although, I ran it via clang, I see no reason that the
output would be different as the backend is the same.

The triple is certainly correct (particularly for llc, clang will treat
armv7-windows as thumbv7-windows).  How did you generate the bit code?  My
testing has usually started from C or LLVM IR rather than bit code, but, I
suspect that shouldn’t be a real issue.

With the given information, the only thing that comes to mind is that your
environment is setup improperly, resulting in the wrong link.exe being invoked.
> ~rajat
> 
> -----Original Message-----
> From: Saleem Abdulrasool [mailto:abdulras at fb.com] 
> Sent: Friday, May 16, 2014 11:23 PM
> To: Rajat Mahajan
> Cc: llvmdev at cs.uiuc.edu
> Subject: Re: [LLVMdev] Code generation support in llvm for windows phone
> 
> 
> On May 16, 2014, at 6:53 AM, Rajat Mahajan <rmahajan at adobe.com>
wrote:
> 
>> Hi,
>> 
>> Is there support available in llc to convert llvm bytecode to Windows
Mobile binary?
>> I have tried triples like arm-pc-win32 , thumbv7-window ... but the
object file generated is not getting linked to the windows native project.
>> Any pointers will be greatly appreciated?
> 
> As Reid mentioned, I have been working on this recently.  Just to make sure
that we are talking about the same environment, I assume that you are talking
about Windows 8 (ARM NT) rather than the Windows CE based environment.
> 
> Can you please explain what exactly you mean by "the object file
generated is not getting linked to the windows native project".  The object
file that we generate should be pretty compatible with MSVC.  If you have
specific cases where we are generating something that is incompatible, I would
be quite interested in hearing about that.
> 
>> Thanks,
>> ~rajat
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu        
https://urldefense.proofpoint.com/v1/url?u=http://llvm.cs.uiuc.edu/&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=4sS%2FRJsOxjeRZpxwDsr85CHzLMrTV5IeD%2Bf2OnxlCFY%3D%0A&s=64253b311de373a46904eada51eb8c9f732f8f65d14f0551223b2a7c769f135a
>>
https://urldefense.proofpoint.com/v1/url?u=http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=4sS%2FRJsOxjeRZpxwDsr85CHzLMrTV5IeD%2Bf2OnxlCFY%3D%0A&s=5c75919fb4cc3458c6e733d0d672d937dca015122c56ab7b826bc6b5ae74a594
> 
> -- 
> Saleem Abdulrasool
> abdulras (at) fb (dot) com
> 
> 
> 
> 
> 
-- 
Saleem Abdulrasool
abdulras (at) fb (dot) com

Hi Saleem,
I have a similar situation - I'd appreciate your inputs on it. I noticed
that the obj file generated using llvm does not contain "thumb"
instructions. I suspect that is what is causing runtime crash for me.


Here's what I've tried -
Start with a.c (on my linux machine where I have llvm/clang built as of
yesterday)
                      int add(int i, int j) {int k = i + j; return k; }
clang  -S  -O0  a.c
llc -filetype=obj -mtriple=thumbv7-windows -O0 a.ll

I get a.obj from the above steps.

I take this a.obj over to my windows 8.1 machine where I have VS2013 update
2 installed

I open up a command window and run
C:\Users\kck\arm>"c:\Program Files (x86)\Microsoft Visual Studio
12.0\vc\bin\x86_arm\vcvarsx86_arm.bat"

I create a file file m.c
int main() { return add(20,30);}

I build the whole thing like this -

cl m.c a.obj

Things seem  to work fine and m.exe gets generated.

However I noticed a difference in the dumpbin output for a.obj and m.obj -
In m.obj, I can see "Thumb instructions" where as in a.obj, I
don't see
that.

I'd appreciate any pointers on this.

Regards,
Kashyap






On Fri, May 30, 2014 at 10:45 PM, Saleem Abdulrasool <abdulras at fb.com>
wrote:
>
> On May 28, 2014, at 5:18 AM, Rajat Mahajan <rmahajan at adobe.com>
wrote:
>
> > I am talking about Windows Mobile 8 and 8.1 and not CE.
> > Not sure though that the Windows 8 (ARM NT) is similar to Windows
Mobile
> 8 platform.
> >
> > I used the following command to generate the obj file
> >    Llc.exe -mtriple=thumbv7-windows  -filetype=obj 
<some_name>.bc
> >
> > The object file generated in the above object doesn't get linked
when I
> try to link it with the windows mobile library as it fails to recognize the
> object format.  ( Not a valid object file )
> >
> > Hope I am clear.
>
> Unfortunately, you have merely repeated your previous statement.  I don’t
> have enough here to diagnose nor even speculate what is going on.
>
> If you can provide the object file, it would be helpful as I am unable to
> reproduce this issue.  Although, I ran it via clang, I see no reason that
> the output would be different as the backend is the same.
>
> The triple is certainly correct (particularly for llc, clang will treat
> armv7-windows as thumbv7-windows).  How did you generate the bit code?  My
> testing has usually started from C or LLVM IR rather than bit code, but, I
> suspect that shouldn’t be a real issue.
>
> With the given information, the only thing that comes to mind is that your
> environment is setup improperly, resulting in the wrong link.exe being
> invoked.
>
> > ~rajat
> >
> > -----Original Message-----
> > From: Saleem Abdulrasool [mailto:abdulras at fb.com]
> > Sent: Friday, May 16, 2014 11:23 PM
> > To: Rajat Mahajan
> > Cc: llvmdev at cs.uiuc.edu
> > Subject: Re: [LLVMdev] Code generation support in llvm for windows
phone
> >
> >
> > On May 16, 2014, at 6:53 AM, Rajat Mahajan <rmahajan at
adobe.com> wrote:
> >
> >> Hi,
> >>
> >> Is there support available in llc to convert llvm bytecode to
Windows
> Mobile binary?
> >> I have tried triples like arm-pc-win32 , thumbv7-window ... but
the
> object file generated is not getting linked to the windows native project.
> >> Any pointers will be greatly appreciated?
> >
> > As Reid mentioned, I have been working on this recently.  Just to make
> sure that we are talking about the same environment, I assume that you are
> talking about Windows 8 (ARM NT) rather than the Windows CE based
> environment.
> >
> > Can you please explain what exactly you mean by "the object file
> generated is not getting linked to the windows native project".  The
object
> file that we generate should be pretty compatible with MSVC.  If you have
> specific cases where we are generating something that is incompatible, I
> would be quite interested in hearing about that.
> >
> >> Thanks,
> >> ~rajat
> >> _______________________________________________
> >> LLVM Developers mailing list
> >> LLVMdev at cs.uiuc.edu
>
https://urldefense.proofpoint.com/v1/url?u=http://llvm.cs.uiuc.edu/&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=4sS%2FRJsOxjeRZpxwDsr85CHzLMrTV5IeD%2Bf2OnxlCFY%3D%0A&s=64253b311de373a46904eada51eb8c9f732f8f65d14f0551223b2a7c769f135a
> >>
>
https://urldefense.proofpoint.com/v1/url?u=http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=4sS%2FRJsOxjeRZpxwDsr85CHzLMrTV5IeD%2Bf2OnxlCFY%3D%0A&s=5c75919fb4cc3458c6e733d0d672d937dca015122c56ab7b826bc6b5ae74a594
> >
> > --
> > Saleem Abdulrasool
> > abdulras (at) fb (dot) com
> >
> >
> >
> >
> >
>
> --
> Saleem Abdulrasool
> abdulras (at) fb (dot) com
>
>
>
>
>
>
> _______________________________________________
> 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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