llvm dev - Apr 2020 - [RFC] DWARF Version 6 Proposal For Heterogeneous Debugging

Hi llvm-dev,

I'm writing on behalf of a team at AMD working on upstreaming support
for AMD GPUs into GDB. We have drafted a proposal of backwards
compatible extensions to DWARF for heterogeneous debugging which is
rendered at
https://llvm.org/docs/AMDGPUDwarfProposalForHeterogeneousDebugging.html.

The proposal includes a thorough introduction with justification, so I
won't belabor that here, but I do want to reiterate that the extensions
are designed to be vendor and architecture neutral, and completely
backwards compatible with DWARF 5.

I am beginning to work on a reference implementation of the proposal in
LLVM, with some very preliminary support appearing in some patches
starting at https://reviews.llvm.org/D76877. Note that most of these
initial patches are AMDGPU-specific CFI changes, and more general
support for the extensions are still a WIP.

I intended to also include the proposal inline, but it appears to be too
large for the list. Instead I will just mention that the source is
available in the llvm-project repo as
llvm/docs/AMDGPUDwarfProposalForHeterogeneousDebugging.rst

Regards,
Scott

I don't know what an acceptable ping rate on an RFC is, but I also 
wanted to add that if anyone prefers to review this on Phabricator the 
latest diff of https://reviews.llvm.org/D70523 essentially includes the 
entire contents of the proposal, because it was moved to another file.

Thanks,
Scott

On 2020-04-17 19:10, Scott Linder via llvm-dev wrote:
> Hi llvm-dev,
> 
> I'm writing on behalf of a team at AMD working on upstreaming support
> for AMD GPUs into GDB. We have drafted a proposal of backwards
> compatible extensions to DWARF for heterogeneous debugging which is
> rendered at
> https://llvm.org/docs/AMDGPUDwarfProposalForHeterogeneousDebugging.html.
> 
> The proposal includes a thorough introduction with justification, so I
> won't belabor that here, but I do want to reiterate that the extensions
> are designed to be vendor and architecture neutral, and completely
> backwards compatible with DWARF 5.
> 
> I am beginning to work on a reference implementation of the proposal in
> LLVM, with some very preliminary support appearing in some patches
> starting at https://reviews.llvm.org/D76877. Note that most of these
> initial patches are AMDGPU-specific CFI changes, and more general
> support for the extensions are still a WIP.
> 
> I intended to also include the proposal inline, but it appears to be 
> too
> large for the list. Instead I will just mention that the source is
> available in the llvm-project repo as
> llvm/docs/AMDGPUDwarfProposalForHeterogeneousDebugging.rst
> 
> Regards,
> Scott
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev

Hi Scott,

It's possible they've missed it, so I've explicitly CC'ed a
number of the
usual DWARF suspects, at least some of whom are on the standards committee.
I don't have anything specific to add myself.

James

On Mon, 27 Apr 2020 at 15:25, via llvm-dev <llvm-dev at lists.llvm.org>
wrote:
> I don't know what an acceptable ping rate on an RFC is, but I also
> wanted to add that if anyone prefers to review this on Phabricator the
> latest diff of https://reviews.llvm.org/D70523 essentially includes the
> entire contents of the proposal, because it was moved to another file.
>
> Thanks,
> Scott
>
> On 2020-04-17 19:10, Scott Linder via llvm-dev wrote:
> > Hi llvm-dev,
> >
> > I'm writing on behalf of a team at AMD working on upstreaming
support
> > for AMD GPUs into GDB. We have drafted a proposal of backwards
> > compatible extensions to DWARF for heterogeneous debugging which is
> > rendered at
> >
https://llvm.org/docs/AMDGPUDwarfProposalForHeterogeneousDebugging.html.
> >
> > The proposal includes a thorough introduction with justification, so I
> > won't belabor that here, but I do want to reiterate that the
extensions
> > are designed to be vendor and architecture neutral, and completely
> > backwards compatible with DWARF 5.
> >
> > I am beginning to work on a reference implementation of the proposal
in
> > LLVM, with some very preliminary support appearing in some patches
> > starting at https://reviews.llvm.org/D76877. Note that most of these
> > initial patches are AMDGPU-specific CFI changes, and more general
> > support for the extensions are still a WIP.
> >
> > I intended to also include the proposal inline, but it appears to be
> > too
> > large for the list. Instead I will just mention that the source is
> > available in the llvm-project repo as
> > llvm/docs/AMDGPUDwarfProposalForHeterogeneousDebugging.rst
> >
> > Regards,
> > Scott
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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