Implement addends in data section relocations #71
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Aaron1011
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Apr 4, 2019
Fixes m4b#71 This commit creates a new variant 'Data' of the 'Reloc' enum. This can be used to define a relocation to a data section entry with a custom addend. With this change, it's now possible to create a relocation representing an index into an array or some other structure, where the addebd represents the offset from the base. I've only implemented this for ELF. Unfortunately, I'm completely unfamiliar with Mach-O, and don't have an OS X instance available to test with. Additionally, I've moved the magic '-4' into a constant, and added some documentation explaining where it comes from (though I may have a few details wrong). I've also tweaked the binary created by src/bin/main.rs to demonstrate using Reloc::Data
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https://github.com/CraneStation/cranelift/blob/master/cranelift-faerie/src/backend.rs#L236-L239
They are needed for at least one test in the rustc test suite. cc https://github.com/bjorn3/rustc_codegen_cranelift/issues/381.
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