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# bb62ef99 20-Apr-2021 Jez Ng <[email protected]>

[lld-macho] Ensure segments are laid out contiguously

codesign/libstuff checks that the `__LLVM` segment is directly
before `__LINKEDIT` by checking that `fileOff + fileSize == next segment
fileOff`

[lld-macho] Ensure segments are laid out contiguously

codesign/libstuff checks that the `__LLVM` segment is directly
before `__LINKEDIT` by checking that `fileOff + fileSize == next segment
fileOff`. Previously, there would be gaps between the segments due to
the fact that their fileOffs are page-aligned but their fileSizes
aren't. In order to satisfy codesign, we page-align fileOff *before*
calculating fileSize. (I don't think codesign checks for the relative
ordering of other segments, so in theory we could do this just for
`__LLVM`, but ld64 seems to do it for all segments.)

Note that we *don't* round up the fileSize of the `__LINKEDIT` segment.
Since it's the last segment, it doesn't need to worry about contiguity;
in addition, codesign checks that the last (hidden) section in
`__LINKEDIT` covers the last byte of the segment, so if we rounded up
`__LINKEDIT`'s size we would have to do the same for its last section,
which is a bother.

While at it, I also addressed a FIXME in the linkedit-contiguity.s test
to cover more `__LINKEDIT` sections.

Reviewed By: #lld-macho, thakis, alexshap

Differential Revision: https://reviews.llvm.org/D100848

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# ca675104 16-Apr-2021 Jez Ng <[email protected]>

[lld-macho] Initial groundwork for -bitcode_bundle

This diff creates an empty XAR file and copies it into
`__LLVM,__bundle`. Follow-up work will actually populate the contents of
that XAR.

Reviewed

[lld-macho] Initial groundwork for -bitcode_bundle

This diff creates an empty XAR file and copies it into
`__LLVM,__bundle`. Follow-up work will actually populate the contents of
that XAR.

Reviewed By: #lld-macho, gkm

Differential Revision: https://reviews.llvm.org/D100650

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