llvm dev - Mar 2016 - Getting the original high-level code

Dear All

Is there is a way I can get the original hogh level code (e.g c++ code) of an IR
function within MCJIT?


Regards,
Marwa Yusuf
Teaching Assistant - Computer Engineering Department
Faculty of Engineering - Benha University
E-JUST PhD Student
Computer Science & Engineering Dept.
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There's nothing built into LLVM and Clang for going backwards through the
lowering chain (MC->IR, IR->C++, etc). I think some third parties have
built some pieces of this, but of course it is rather lossy.

On Tue, Mar 15, 2016 at 6:22 AM, marwayusuf at feng.bu.edu.eg via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> Dear All
>
> Is there is a way I can get the original hogh level code (e.g c++ code) of
> an IR function within MCJIT?
>
>
> Regards,
> Marwa Yusuf
> Teaching Assistant - Computer Engineering Department
> Faculty of Engineering - Benha University
> E-JUST PhD Student
> Computer Science & Engineering Dept.
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
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Hi Marwa,

There's no generic way to de-compile IR, but if the IR has debug info
attached you may be able to find the path to the original source file.

- Lang.

On Tue, Mar 15, 2016 at 10:43 AM, David Blaikie via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> There's nothing built into LLVM and Clang for going backwards through
the
> lowering chain (MC->IR, IR->C++, etc). I think some third parties
have
> built some pieces of this, but of course it is rather lossy.
>
> On Tue, Mar 15, 2016 at 6:22 AM, marwayusuf at feng.bu.edu.eg via llvm-dev
<
> llvm-dev at lists.llvm.org> wrote:
>
>> Dear All
>>
>> Is there is a way I can get the original hogh level code (e.g c++ code)
>> of an IR function within MCJIT?
>>
>>
>> Regards,
>> Marwa Yusuf
>> Teaching Assistant - Computer Engineering Department
>> Faculty of Engineering - Benha University
>> E-JUST PhD Student
>> Computer Science & Engineering Dept.
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>
>>
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
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On 3/15/16 9:22 AM, marwayusuf at feng.bu.edu.eg via llvm-dev
wrote:
>
> Dear All
>
> Is there is a way I can get the original hogh level code (e.g c++ 
> code) of an IR function within MCJIT?
>
You might want to specify the context.  Are you compiling high level 
code to LLVM IR to MachineInstr to MC and then wanting to map an MC 
instruction back to a source level instruction?  Or are you 
disassembling a binary program to the MC IR and then wanting to 
reconstruct the source code?

The answer to your question depends on which of these you are trying to do.

Regards,

John Criswell
>
> Regards,
> Marwa Yusuf
> Teaching Assistant - Computer Engineering Department
> Faculty of Engineering - Benha University
> E-JUST PhD Student
> Computer Science & Engineering Dept.
>
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev

-- 
John Criswell
Assistant Professor
Department of Computer Science, University of Rochester
http://www.cs.rochester.edu/u/criswell

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I've compiled high level to IR and I want to get the original source code
(Not to generate high level code) of a given IR function or part of function
like a loop for example.


Regards,
Marwa Yusuf
Teaching Assistant - Computer Engineering Department
Faculty of Engineering - Benha University
E-JUST PhD Student
Computer Science & Engineering Dept.


________________________________
From: John Criswell <jtcriswel at gmail.com>
Sent: Wednesday, March 16, 2016 4:00 PM
To: marwayusuf at feng.bu.edu.eg; llvm-dev at lists.llvm.org
Subject: Re: [llvm-dev] Getting the original high-level code

On 3/15/16 9:22 AM, marwayusuf at feng.bu.edu.eg<mailto:marwayusuf at
feng.bu.edu.eg> via llvm-dev wrote:

Dear All

Is there is a way I can get the original hogh level code (e.g c++ code) of an IR
function within MCJIT?

You might want to specify the context.  Are you compiling high level code to
LLVM IR to MachineInstr to MC and then wanting to map an MC instruction back to
a source level instruction?  Or are you disassembling a binary program to the MC
IR and then wanting to reconstruct the source code?

The answer to your question depends on which of these you are trying to do.

Regards,

John Criswell



Regards,
Marwa Yusuf
Teaching Assistant - Computer Engineering Department
Faculty of Engineering - Benha University
E-JUST PhD Student
Computer Science & Engineering Dept.



_______________________________________________
LLVM Developers mailing list
llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>
http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev




--
John Criswell
Assistant Professor
Department of Computer Science, University of Rochester
http://www.cs.rochester.edu/u/criswell
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