llvm dev - Aug 2016 - Upcoming Stackmap Version Change

Hi everyone,

In the current version of the stackmap format (v1), it is not possible to
associate callsites with their respective functions. This seriously limits the
usefulness of the stackmaps, since one cannot walk a stack (for the purposes of,
say, GC) unless this is fixed.

I have put together a patch that remedies this problem, but this requires
changing the format of stackmaps very slightly (one extra field per function
entry emitted).

Our plan is to bump the stackmap version number supported in LLVM from 1 to 2 so
that external tools do not have silent breakages. We will also be dropping
support for parsing/emitting version 1 maps in LLVM once this patch is merged
into trunk, since this is mostly a bugfix for v1-style maps. (see here for more
details: https://reviews.llvm.org/D23487 <https://reviews.llvm.org/D23487>
)

~kavon
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