[llvm-dev] Stack maps on AArch64

Philip Reames via llvm-dev llvm-dev at lists.llvm.org
Mon Jun 13 09:58:11 PDT 2016

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?


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 
> <mailto: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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