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feat(achilles): Implement a Unit type

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Add support for a zero-sized Unit type. This requires some special at
the codegen level because LLVM (unsurprisingly) only allows Void types
in function return position - to make that a little easier to handle
there's a new pass that strips any unit-only expressions and pulls
unit-only function arguments up to new `let` bindings, so we never have
to actually pass around unit values.

Change-Id: I0fc18a516821f2d69172c42a6a5d246b23471e38
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2695
Reviewed-by: glittershark <grfn@gws.fyi>
Tested-by: BuildkiteCI
This commit is contained in:
Griffin Smith 2021-03-28 13:28:49 -04:00 • committed by glittershark
parent db62866d82
commit 8e13b1303a
16 changed files with 447 additions and 88 deletions
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users/glittershark/achilles/Cargo.lock generated
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@ -16,6 +16,7 @@ dependencies = [
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@ -31,6 +32,15 @@ dependencies = [
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