llvm dev - Aug 2011 - [LLVMdev] tools to debug human readable llvm assembly bc code?

Hi,

I am working with a long llvm bc code in human readable form. I am wondering
is there a tool like gdb to help me debug that piece of code?

Thanks,

Christine
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On Aug 18, 2011, at 4:39 PM, Christine Cheng wrote:
> Hi,
> 
> I am working with a long llvm bc code in human readable form. I am
wondering is there a tool like gdb to help me debug that piece of code?
It's not directly executable so no, not really. You could try debugging lli
but that's probably pretty painful and is effectively debugging jitted code.

You could try to use bugpoint to reduce a test case out of what you have.

-eric

Hi Eric,

Thanks for the reply. I am very new to llvm so could you elaborate more
about you meant by 'debugging lli'?

Thanks a lot!

Christine

On Thu, Aug 18, 2011 at 4:47 PM, Eric Christopher <echristo at
apple.com>wrote:
>
> On Aug 18, 2011, at 4:39 PM, Christine Cheng wrote:
>
> > Hi,
> >
> > I am working with a long llvm bc code in human readable form. I am
> wondering is there a tool like gdb to help me debug that piece of code?
>
> It's not directly executable so no, not really. You could try debugging
lli
> but that's probably pretty painful and is effectively debugging jitted
code.
>
> You could try to use bugpoint to reduce a test case out of what you have.
>
> -eric
>
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Another possibility is to generate C code from IR using the C backend,
then compile and debug that C code with gdb.  The generated C
statements may be close enough to IR instructions for your purposes.
I've successfully used this method in the past, although I don't know
what the state of the C backend is these days, since I understand it
is not fully supported.

Kevin

On Thu, Aug 18, 2011 at 7:39 PM, Christine Cheng <clcheng at stanford.edu>
wrote:
> Hi,
>
> I am working with a long llvm bc code in human readable form. I am
wondering
> is there a tool like gdb to help me debug that piece of code?
>
> Thanks,
>
> Christine
>
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