diff options
Diffstat (limited to 'compiler/coreSyn/ExternalCore.lhs')
| -rw-r--r-- | compiler/coreSyn/ExternalCore.lhs | 29 |
1 files changed, 18 insertions, 11 deletions
diff --git a/compiler/coreSyn/ExternalCore.lhs b/compiler/coreSyn/ExternalCore.lhs index f002c3a3e5..ecc24b1155 100644 --- a/compiler/coreSyn/ExternalCore.lhs +++ b/compiler/coreSyn/ExternalCore.lhs @@ -34,7 +34,7 @@ data Exp | Lam Bind Exp | Let Vdefg Exp | Case Exp Vbind Ty [Alt] {- non-empty list -} - | Cast Exp Ty + | Cast Exp Coercion | Tick String Exp {- XXX probably wrong -} | External String String Ty {- target name, convention, and type -} | DynExternal String Ty {- convention and type (incl. Addr# of target as first arg) -} @@ -52,23 +52,30 @@ data Alt type Vbind = (Var,Ty) type Tbind = (Tvar,Kind) --- Internally, we represent types and coercions separately; but for --- the purposes of external core (at least for now) it's still --- convenient to collapse them into a single type. data Ty = Tvar Tvar | Tcon (Qual Tcon) | Tapp Ty Ty | Tforall Tbind Ty + +data Coercion -- We distinguish primitive coercions because External Core treats -- them specially, so we have to print them out with special syntax. - | TransCoercion Ty Ty - | SymCoercion Ty - | UnsafeCoercion Ty Ty - | InstCoercion Ty Ty - | NthCoercion Int Ty - | AxiomCoercion (Qual Tcon) Int [Ty] - | LRCoercion LeftOrRight Ty + = ReflCoercion Role Ty + | SymCoercion Coercion + | TransCoercion Coercion Coercion + | TyConAppCoercion Role (Qual Tcon) [Coercion] + | AppCoercion Coercion Coercion + | ForAllCoercion Tbind Coercion + | CoVarCoercion Var + | UnivCoercion Role Ty Ty + | InstCoercion Coercion Ty + | NthCoercion Int Coercion + | AxiomCoercion (Qual Tcon) Int [Coercion] + | LRCoercion LeftOrRight Coercion + | SubCoercion Coercion + +data Role = Nominal | Representational | Phantom data LeftOrRight = CLeft | CRight |