[LLVMdev] DWARF unmangled subprog name (DW_AT_name)

[Eric Christopher]

Have you checked out llvm-symbolize? It's what the asan folk
(including Alexey) have created for backtrace symbolication.

-eric

On Wed, May 7, 2014 at 11:28 AM, Isaiah Norton <isaiah.norton at gmail.com> wrote:
> The use case is getting the short name for backtraces. There are other
> options, but I figured it was worth a shot trying to access from the DWARF
> structure because what we need is already stored there anyway.
>
> Thanks,
> Isaiah
>
>
> On Wed, May 7, 2014 at 12:24 PM, Alexey Samsonov <samsonov at google.com>
> wrote:
>>
>> Yeah, public API of DebugInfo library is quite minimalistic. But I agree
>> with Eric - what is the use case for getting unmangled name from DIE?
>>
>>
>> On Tue, May 6, 2014 at 11:21 PM, Keno Fischer
>> <kfischer at college.harvard.edu> wrote:
>>>
>>> That doesn't seem possible with the public API or am I mistaking?
>>>
>>>
>>> On Wed, May 7, 2014 at 12:13 AM, Eric Christopher <echristo at gmail.com>
>>> wrote:
>>>>
>>>> On Tue, May 6, 2014 at 8:09 PM, Isaiah Norton <isaiah.norton at gmail.com>
>>>> wrote:
>>>> > Hi,
>>>> >
>>>> > I am looking for a way to get unmangled subprogram names from a
>>>> > DWARFContext. The name I want is available in the attribute
>>>> > `DW_AT_name`
>>>> > [1], but as far as I can tell this is only returned as a fallback in
>>>> > `DWARFDebugInfoEntryMinimal::getSubroutineName` when the linkage name
>>>> > is not
>>>> > available [2].
>>>> >
>>>> > If this is not currently possible, is there any interest in adding
>>>> > such
>>>> > access to the public DebugInfo API? Perhaps with an additional
>>>> > "UnmangledName" option in `DILineInfoSpecifier`.
>>>> >
>>>> > Thanks,
>>>> > Isaiah
>>>> >
>>>> > [1]: for example:
>>>> >
>>>> > 0x0001bb00:   DW_TAG_subprogram [2]
>>>> >                 DW_AT_MIPS_linkage_name [DW_FORM_strp]  (
>>>> > .debug_str[0x00007934] = "julia_vcat4473")
>>>> >                 DW_AT_name [DW_FORM_strp]       (
>>>> > .debug_str[0x00000913] =
>>>> > "vcat")
>>>> >
>>>> >
>>>> > [2]
>>>> >
>>>> > https://github.com/llvm-mirror/llvm/blob/master/lib/DebugInfo/DWARFDebugInfoEntry.cpp#L279-L286
>>>> >
>>>> >
>>>>
>>>> If you just want the DW_AT_name you should be able to iterate over the
>>>> DIEs and pull out the DW_AT_name attribute from all of the subprogram
>>>> DIEs. Is there some other use that you're looking for? I'm not quite
>>>> sure what you're trying to accomplish.
>>>>
>>>> -eric
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>>>
>>>
>>>
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>>
>>
>>
>> --
>> Alexey Samsonov, Mountain View, CA
>>
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