[LLVMdev] DWARF unmangled subprog name (DW_AT_name)

[Isaiah Norton]

>
> Alright, I see why it makes sense. We can pass this information through
>> DILineInfoSpecifier. In fact, probably it makes sense to change the layout
>> of this structure:
>> there would be 3 types of file/line info (None, Regular,
>> AbsoluteFilePath). (though, probably we may make latter the default) and 3
>> types of function name info (None, Name, LinkageName).
>>
>
> FYI I've implemented it in r209050.
>

This works great - thank you!




On Wed, May 7, 2014 at 2:36 PM, Alexey Samsonov <samsonov at google.com> wrote:
>>>
>>>>
>>>> On Wed, May 7, 2014 at 11:33 AM, Eric Christopher <echristo at gmail.com>wrote:
>>>>
>>>>> Have you checked out llvm-symbolize? It's what the asan folk
>>>>> (including Alexey) have created for backtrace symbolication.
>>>>>
>>>>
>>>> Yeah, we potentially can add some kind of option: "llvm-symbolizer
>>>> -print-short-function-names", I don't yet see why this would be valuable.
>>>> What's wrong with printing full function names?
>>>>
>>>>
>>>>>
>>>>> -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
>>>>> >>>> _______________________________________________
>>>>> >>>> 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
>>>>> >>>
>>>>> >>
>>>>> >>
>>>>> >>
>>>>> >> --
>>>>> >> Alexey Samsonov, Mountain View, CA
>>>>> >>
>>>>> >> _______________________________________________
>>>>> >> 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
>>>>> >
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Alexey Samsonov, Mountain View, CA
>>>>
>>>
>>>
>>
>>
>> --
>> Alexey Samsonov, Mountain View, CA
>>
>
>
>
> --
> Alexey Samsonov, Mountain View, CA
>
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