[LLVMdev] Status of support in dwarf4

[Eric Christopher]

On Mon, Jul 8, 2013 at 12:45 PM, Eric Christopher <echristo at gmail.com> wrote:
>> I've built the llvm-dwarfdump tool from the 3.3 branch and ran it on simple
>> binary compiled with dwarf4 debug information.
>>
>>
>>
>> The tool seem to read the file correctly including dwarf information
>> (DIContext::getDWARFContext returns a valid context), but when trying to
>> access line information, all I get is "<invalid>" string for the file name
>> and 0's for line and column information.
>>
>>
>>
>> I've seen that there was a talk in the recent Europoe lldb-dev meeting but
>> couldn't figure out the current status from the slides.
>>
>>
>>
>> Am I missing something or there still no support for parsing dwarf4 info?
>>
>
> You're missing something. Basically there is some support for parsing
> it in llvm-dwarfdump, but that tool is largely used for testing the
> code emission of llvm and clang. If there's something missing/needed
> we've been adding it as we go along. Line information is one of those
> that needs to be added.
>

Slight clarification: We can dump the line information we output, but
I've definitely seen binaries output by gcc that we can't dump. I'm
not sure what the issue is and haven't looked yet.

-eric


> llvm support of dwarf4 itself is pretty decent with just a few
> features of dwarf4 that aren't used.
>
> -eric
>
>> Thanks,
>>
>> Benjamin.
>>
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