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authorGriffin Smith <grfn@gws.fyi>2021-03-28T17·28-0400
committerglittershark <grfn@gws.fyi>2021-03-28T17·33+0000
commit8e13b1303a0d152c2f3b68f2421163e94fdf226c (patch)
tree0cac0fee2cd52f912bb118cff78fdca9d28ac895 /users/glittershark/achilles/src/interpreter/mod.rs
parentdb62866d820cf524b67cebe34033d3928804cf3c (diff)
feat(achilles): Implement a Unit type r/2356
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
Diffstat (limited to 'users/glittershark/achilles/src/interpreter/mod.rs')
-rw-r--r--users/glittershark/achilles/src/interpreter/mod.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/users/glittershark/achilles/src/interpreter/mod.rs b/users/glittershark/achilles/src/interpreter/mod.rs
index bcd474b3abe1..a8ba2dd3acdc 100644
--- a/users/glittershark/achilles/src/interpreter/mod.rs
+++ b/users/glittershark/achilles/src/interpreter/mod.rs
@@ -30,6 +30,7 @@ impl<'a> Interpreter<'a> {
             Expr::Literal(Literal::Int(i), _) => Ok((*i).into()),
             Expr::Literal(Literal::Bool(b), _) => Ok((*b).into()),
             Expr::Literal(Literal::String(s), _) => Ok(s.clone().into()),
+            Expr::Literal(Literal::Unit, _) => unreachable!(),
             Expr::UnaryOp { op, rhs, .. } => {
                 let rhs = self.eval(rhs)?;
                 match op {