DWARF RenderScript vendor extension

[EwanCrawford]

Summary

Patch adds a DWARF language vendor extension for RenderScript.
We are already using this identifier in LLDB with a hard coded value, so it would be good to get it in LLVM and use the generated enum.

[echristo]

OK. If you're serious about wanting this though we should get it into the
dwarf standard though.

[srhines]

In D16409#332524, @echristo wrote:

OK. If you're serious about wanting this though we should get it into the
dwarf standard though.

I think that Ewan already applied for this to be included in the next revision. He can confirm that when he is back online.

[probinson]

include/llvm/Support/Dwarf.def

323 ↗

(On Diff #45534)

Symbols for vendor extensions ought to have a prefix identifying the vendor. Among other things, you don't want to conflict with whatever symbol the DWARF committee comes up with for the "standard" value, if we define one.

[EwanCrawford]

Thanks for taking a look.

We applied for the RenderScript DW_LANG constant to be added to the DWARF standard back in March.

The feedback was that since we'd missed the version 5 submission deadline to use a vendor extension
until it could be added to a following version of the standard.

Since that was a while ago however we'll chase that up.

[probinson]

In D16409#333388, @EwanCrawford wrote:

Thanks for taking a look.

We applied for the RenderScript DW_LANG constant to be added to the DWARF standard back in March.

The feedback was that since we'd missed the version 5 submission deadline to use a vendor extension
until it could be added to a following version of the standard.

Since that was a while ago however we'll chase that up.

Yes please, I'm not seeing it in the DWARF issues list.

[echristo]

Search fail then as I must have missed the mail. Did you put a proposal in
on dwarfstd.org? Either way, following up would be great.

-eric

[EwanCrawford]

The request was indeed put through dwarfstd.org, but apparently there was a problem with the notifications.
Up now though, please see http://www.dwarfstd.org/ShowIssue.php?issue=150331.1

[echristo]

LGTM.

And yes, I saw the mail finally come across the dwarf list with the website problems mentioned.

Thanks!

-eric

llvm/trunk/include/llvm/Support/Dwarf.def

 HANDLE_DW_LANG(0x001d, C11)
 HANDLE_DW_LANG(0x001e, Swift)
 HANDLE_DW_LANG(0x001f, Julia)
 HANDLE_DW_LANG(0x0020, Dylan)
 HANDLE_DW_LANG(0x0021, C_plus_plus_14)
 HANDLE_DW_LANG(0x0022, Fortran03)
 HANDLE_DW_LANG(0x0023, Fortran08)
 HANDLE_DW_LANG(0x8001, Mips_Assembler)
+HANDLE_DW_LANG(0x8e57, GOOGLE_RenderScript)
 HANDLE_DW_LANG(0xb000, BORLAND_Delphi)
 
 // DWARF attribute type encodings.
 HANDLE_DW_ATE(0x01, address)
 HANDLE_DW_ATE(0x02, boolean)
 HANDLE_DW_ATE(0x03, complex_float)
 HANDLE_DW_ATE(0x04, float)
 HANDLE_DW_ATE(0x05, signed)