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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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5
users/glittershark/achilles/src/compiler.rs
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@ -8,7 +8,7 @@ use test_strategy::Arbitrary;
use crate::codegen::{self, Codegen};
use crate::common::Result;
use crate::passes::hir::monomorphize;
use crate::passes::hir::{monomorphize, strip_positive_units};
use crate::{parser, tc};
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Arbitrary)]
@ -55,9 +55,10 @@ pub struct CompilerOptions {
pub fn compile_file(input: &Path, output: &Path, options: &CompilerOptions) -> Result<()> {
let src = fs::read_to_string(input)?;
let (_, decls) = parser::toplevel(&src)?; // TODO: statements
let (_, decls) = parser::toplevel(&src)?;
let mut decls = tc::typecheck_toplevel(decls)?;
monomorphize::run_toplevel(&mut decls);
strip_positive_units::run_toplevel(&mut decls);
let context = codegen::Context::create();
let mut codegen = Codegen::new(