[llvm-dev] recognise DW_AT_SUN_amd64_parmdump dwarf attribute

[Adrian Prantl via llvm-dev]

> On Apr 27, 2017, at 5:42 PM, David Gwynne <david at gwynne.id.au> wrote:
> 
> 
>> On 28 Apr 2017, at 01:49, Adrian Prantl <aprantl at apple.com> wrote:
>> 
>> 
>>> On Apr 27, 2017, at 8:38 AM, David Blaikie <dblaikie at gmail.com> wrote:
>>> 
>>> This'll need a test case, in any case.
>> 
>> In case you're wondering, one way to do this would be to add an assembler source file, compile it and run it through llvm-dwarfdump.
> 
> cool, can you point me at an existing one that i can use as a reference?

Here's a very recent example:

https://reviews.llvm.org/D32618
> 
>> Alternatively you can use the new yaml2obj tool that is being developed.
> 
> ill try the first suggestion for now.
> 
> cheers,
> dlg
> 
>> 
>> -- adrian
>> 
>>> 
>>> Adrian/Paul: Pondering this, any thoughts on how conflicts in the vendor extension range of attributes, forms, etc, should be resolved if they ever come up? (each vendor is free to define them as they wish, so it could be that multiple vendors have different definitions of the same code/number & would be ambiguous) I don't see any reason to block this patch if it doesn't have such a conflict, since there are already other vendor extension codes supported here for a variety of vendors - but does make me wonder.
>>> 
>>> On Thu, Apr 27, 2017 at 2:50 AM David Gwynne via llvm-dev <llvm-dev at lists.llvm.org> wrote:
>>> sun created this tag for identifying functions that dumped their
>>> register arguments onto the stack.
>>> 
>>> this is enough for llvm-dwarfdump to recognise and print the attribute.
>>> 
>>> hopefully someone will commit it.
>>> 
>>> cheers,
>>> dlg
>>> 
>>> Index: include/llvm/Support/Dwarf.def
>>> ===================================================================
>>> --- include/llvm/Support/Dwarf.def      (revision 301500)
>>> +++ include/llvm/Support/Dwarf.def      (working copy)
>>> @@ -343,6 +343,8 @@
>>> HANDLE_DW_AT(0x2134, GNU_pubnames, 0, GNU)
>>> HANDLE_DW_AT(0x2135, GNU_pubtypes, 0, GNU)
>>> HANDLE_DW_AT(0x2136, GNU_discriminator, 0, GNU)
>>> +// Sun Extension
>>> +HANDLE_DW_AT(0x2224, SUN_amd64_parmdump, 0, GNU)
>>> // Borland extensions.
>>> HANDLE_DW_AT(0x3b11, BORLAND_property_read, 0, BORLAND)
>>> HANDLE_DW_AT(0x3b12, BORLAND_property_write, 0, BORLAND)
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>> 
>