[LLVMdev] bugpoint usage

[Fernando Magno Quintao Pereira]

Hey, Seung,

     I think what you want is to use gdb to debug your pass, isn' it? If 
you are running your pass with llc (or opt, etc), you only have to do "gdb 
llc", and the debugger will load all your files and libraries. Then you 
can set breakpoints, and do everything that gdb does. Also, many times I 
have been using gdb to debug the assembly code produced by llc. You only 
have to compile it with -g, and it will work, e.g. gcc p.s -o p.exe ; gdb 
p.exe.

Fernando

> Thank you for this information.
> If so, is there any way to grasp which kinda data throw in and out in LLVM as shown in such a way in gdb?
> Thanks,
>
> Seung Jae Lee
>
> ---- Original message ----
>> Date: Tue, 20 Feb 2007 23:54:04 -0600
>> From: "John T. Criswell" <criswell at cs.uiuc.edu>
>> Subject: Re: [LLVMdev] bugpoint usage
>> To: LLVM Developers Mailing List <llvmdev at cs.uiuc.edu>
>>
>> Seung Jae Lee wrote:
>>> Hello.
>>> Can I use debugging options such as 'step', 'next'(in gdb) also in LLVM bugpoint?
>>>
>> I assume you're asking if you can use commands like "step" or "next"
>> when using bugpoint.  The answer is no, but this is because bugpoint is
>> not a debugger like gdb.  Bugpoint is a program that reduces testcases
>> that trigger bugs in LLVM passes.
>>
>> Often times in LLVM development, some large LLVM bytecode file triggers
>> a bug in a set of LLVM passes.  It is difficult to know what LLVM passes
>> are responsible for the failure or what part of the input is triggering
>> the problem.  Bugpoint automates the process of narrowing down where a
>> bug is and what input is triggering it.
>>
>> For more information, you can read about bugpoint at:
>>
>> http://llvm.org/docs/HowToSubmitABug.html
>> http://llvm.org/docs/CommandGuide/html/bugpoint.html
>>
>> -- John T.
>>
>>> Thank you.
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