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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/ach
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/ach')
-rw-r--r--users/glittershark/achilles/ach/.gitignore1
-rw-r--r--users/glittershark/achilles/ach/units.ach7
2 files changed, 8 insertions, 0 deletions
diff --git a/users/glittershark/achilles/ach/.gitignore b/users/glittershark/achilles/ach/.gitignore
index 07b37e168979..ac5296ebbd74 100644
--- a/users/glittershark/achilles/ach/.gitignore
+++ b/users/glittershark/achilles/ach/.gitignore
@@ -4,3 +4,4 @@
 functions
 simple
 externs
+units
diff --git a/users/glittershark/achilles/ach/units.ach b/users/glittershark/achilles/ach/units.ach
new file mode 100644
index 000000000000..70635d978c7c
--- /dev/null
+++ b/users/glittershark/achilles/ach/units.ach
@@ -0,0 +1,7 @@
+extern puts : fn cstring -> int
+
+ty print : fn cstring -> ()
+fn print x = let _ = puts x in ()
+
+ty main : fn -> int
+fn main = let _ = print "hi" in 0