llvm dev - Sep 2012 - [LLVMdev] A Question about LLVM-backend

Hello, all.

I want to manipulate LLVM-backend to emit other compiler's IR, in this
case, VPO's IR.
So, what i want to know is.. Is there a project to be referred? (For
example, "Do LLVM-backend -> GIMPLE" project exist?)
Or, how can I manipulate it easily?

Thanks,
Cho Yeong-pil
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Hi 조영필,

 > I want to manipulate LLVM-backend to emit other compiler's IR, in this
case,
> VPO's IR.
> So, what i want to know is.. Is there a project to be referred? (For
example,
> "Do LLVM-backend -> GIMPLE" project exist?)
as far as I know there is no LLVM IR -> gimple pass.  LLVM used to have a C
backend that turned LLVM IR into C.  I think it was removed in 3.1 already,
because it was buggy and unmaintained, but you can find it in older versions
of LLVM and it may give you some ideas.
> Or, how can I manipulate it easily?
You can write a module pass that iterates over all objects in the module
(global variables, functions etc) and squirts out IR for your other compiler.
That's basically what the C backend did.

Ciao, Duncan.
>
> Thanks,
> Cho Yeong-pil
>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>

On 13/09/12 10:57, Duncan Sands wrote:
> Hi 조영필,
>
>   > I want to manipulate LLVM-backend to emit other compiler's IR,
in this case,
>> VPO's IR.
>> So, what i want to know is.. Is there a project to be referred? (For
example,
>> "Do LLVM-backend -> GIMPLE" project exist?)
>
> as far as I know there is no LLVM IR -> gimple pass.  LLVM used to have
a C
> backend that turned LLVM IR into C.  I think it was removed in 3.1 already,
> because it was buggy and unmaintained, but you can find it in older
versions
> of LLVM and it may give you some ideas.
>
For those that are interested, I can provide a patch to the current 
trunk which provides a working version of the C backend.  So far this 
patch just takes the parts that were removed and updates them to the 
current infrastructure.

>> Or, how can I manipulate it easily?
>
> You can write a module pass that iterates over all objects in the module
> (global variables, functions etc) and squirts out IR for your other
compiler.
> That's basically what the C backend did.
>
> Ciao, Duncan.
>
>>
>> Thanks,
>> Cho Yeong-pil
>>
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>