llvm dev - Apr 2009 - [LLVMdev] Pulling line number/file/path information from DbgStopPointInst instructions

Hi folks,

I had some code that used to work fine in earlier versions of LLVM,  
but is now failing. I have some code that expands DbgStopPointInst  
instructions to my own entry points in an opt pass, but it's currently  
failing to get the file name and path back, though it is still  
correctly getting line numbers. If you happen to have a code fragment  
that is known to work, it would be much appreciated.

What it used to work was calling getFileName()->getNameStr() on the  
DbgStopPointInst, which returned a std::string, but in LLVM 2.5 the  
code compiles, but that string is empty. Any clues?

[s]

On Wed, Apr 29, 2009 at 6:04 PM, Sarah Thompson <sarah at
findatlantis.com> wrote:
> Hi folks,
>
> I had some code that used to work fine in earlier versions of LLVM,
> but is now failing. I have some code that expands DbgStopPointInst
> instructions to my own entry points in an opt pass, but it's currently
> failing to get the file name and path back, though it is still
> correctly getting line numbers. If you happen to have a code fragment
> that is known to work, it would be much appreciated.
>
Hi Sarah,

I'm not sure if this will help you out, but take a look at how
DwarfWriter::getOrCreateSourceID is used. Unfortunately, I don't see
how to get the file name from a DbgStopPointInstr right offhand.
Things in the CodeGen/AsmPrinter/DwarfWriter.cpp file have changed
quite a bit in recent months...

-bw
> What it used to work was calling getFileName()->getNameStr() on the
> DbgStopPointInst, which returned a std::string, but in LLVM 2.5 the
> code compiles, but that string is empty. Any clues?
>
> [s]
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>

Hmm... if I do a print() on the result of getFileName(), I get

	i8 * getelementptr ([9 x i8]* @.str, i32 0, i32 0)

back, but if I try to dyn_cast this to GetElementPtrInst it fails  
(returning null), so presumably I'm seeing a  
GetElementPtrConstantExpr... so how can I get at that constant i8  
array without casting to a GetElementPtrInst, and with  
GetElementPtrConstantExpr being inaccessible to user code?

[s]


On Apr 29, 2009, at 6:29 PM, Bill Wendling wrote:
> On Wed, Apr 29, 2009 at 6:04 PM, Sarah Thompson <sarah at
findatlantis.com
> > wrote:
>> Hi folks,
>>
>> I had some code that used to work fine in earlier versions of LLVM,
>> but is now failing. I have some code that expands DbgStopPointInst
>> failing to get the file name and path back, though it is still
>> correctly getting line numbers. If you happen to have a code fragment
>> that is known to work, it would be much appreciated.
>>
> Hi Sarah,
>
> I'm not sure if this will help you out, but take a look at how
> DwarfWriter::getOrCreateSourceID is used. Unfortunately, I don't see
> how to get the file name from a DbgStopPointInstr right offhand.
> Things in the CodeGen/AsmPrinter/DwarfWriter.cpp file have changed
> quite a bit in recent months...
>
> -bw
>
>> What it used to work was calling getFileName()->getNameStr() on the
>> DbgStopPointInst, which returned a std::string, but in LLVM 2.5 the
>> code compiles, but that string is empty. Any clues?
>>
>> [s]
>> _______________________________________________
>> 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