[PATCH] [lld] [mach-o] implement minimal __unwind_info support

[David Blaikie]

On Sep 9, 2014 4:50 AM, "Tim Northover" <t.p.northover at gmail.com> wrote:
>
> Hi kledzik,
>
> Hi,
>
> I've finally had some time to work on generating __unwind_info sections.
The attached patch is fairly limited, but seemed like a minimally useful
implementation:
>
>   - It's x86_64 only.
>   - It will fail if more than 3 personality functions are used.

Now I'm just curious... Why 3? (How did you end up with that
limitation/number)

>   - It will fail if there is a function without a __compact_unwind entry.
>   - It only produces normal pages, rather than compressed.
>
> I intend to fix those, and I think most of them should be fairly small
additions in the current scheme, but I'd like to get any major design
problems hammered out before I start.
>
> So, any suggestions? Is it OK to commit?
>
> Cheers.
>
> Tim.
>
> http://reviews.llvm.org/D5261
>
> Files:
>   include/lld/Core/DefinedAtom.h
>   include/lld/ReaderWriter/MachOLinkingContext.h
>   lib/Core/DefinedAtom.cpp
>   lib/ReaderWriter/MachO/ArchHandler.h
>   lib/ReaderWriter/MachO/ArchHandler_arm.cpp
>   lib/ReaderWriter/MachO/ArchHandler_x86.cpp
>   lib/ReaderWriter/MachO/ArchHandler_x86_64.cpp
>   lib/ReaderWriter/MachO/CMakeLists.txt
>   lib/ReaderWriter/MachO/CompactUnwindPass.cpp
>   lib/ReaderWriter/MachO/CompactUnwindPass.hpp
>   lib/ReaderWriter/MachO/MachOLinkingContext.cpp
>   lib/ReaderWriter/MachO/MachONormalizedFileFromAtoms.cpp
>   lib/ReaderWriter/MachO/MachOPasses.h
>   lib/ReaderWriter/YAML/ReaderWriterYAML.cpp
>   test/mach-o/exe-offsets.yaml
>   test/mach-o/exe-segment-overlap.yaml
>   test/mach-o/unwind-info-simple.yaml
>
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