[llvm-dev] Stack maps on AArch64

[Lang Hames via llvm-dev]

Hi All,

I don't recall anything MachO specific in the AArch64 stack maps code.
Digging through the svn history it looks like the call
to SM.serializeToStackMapSection() used to be unconditional but was put
under the isOSBinFormateMachO() test in r206610. Tim - was there a reason
for that? If not, I think it should be safe to just move it back out.

Cheers,
Lang.

On Mon, Jun 13, 2016 at 1:07 PM, Juergen Ributzka via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> [+ Lang]
>
> On Jun 13, 2016, at 9:58 AM, Philip Reames via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
> Andy, Juergen,
>
> I don't know enough about AArch64 to assess here.  Is the proposed change
> below something we should take in tree?  I'm happy to do the mechanics of
> posting a patch (if Rob doesn't), but I don't know enough to assess.  Would
> such a patch be self contained?  Or is there other work needed?
>
> Philip
>
> On 05/26/2016 12:28 PM, Rob Lyerly via llvm-dev wrote:
>
> I figured out the issue -- the AArch64 backend only emits the stack map
> section if isOSBinFormateMachO() returns true -- see [1], lines 123 - 134.
> Moving the call to serializeToStackMapSection() outside of the conditional
> fixes the problem.
>
> [1] http://llvm.org/doxygen/AArch64AsmPrinter_8cpp_source.html
>
> On Thu, May 26, 2016 at 2:46 PM, Rob Lyerly <rlyerly at vt.edu> wrote:
>
>> Hi everyone,
>>
>> I'm using LLVM's stack map intrinsic to store value location
>> information.  I've got a pass that automatically inserts the
>> "llvm.experimental.stackmap" intrinsic into the IR.  On x86-64, an
>> ".llvm_stackmaps" section is successfully emitted (I can see the section &
>> its contents in the generated assembly).  However I can't get the AArch64
>> backend to generate this section.  On the website with information about
>> the intrinsic [1], it says that AArch64 is supported.  Is there a flag I
>> need to add, or is there something I need to enable when building LLVM to
>> get this support?
>>
>> [1] http://llvm.org/docs/StackMaps.html
>>
>> --
>> Rob Lyerly
>> Graduate Research Assistant, Systems Software Research Group
>>
>>
>>
>
>
>
> --
> Rob Lyerly
> Graduate Research Assistant, Systems Software Research Group
>
>
>
>
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