This BIG PATCH contains most of the work for the New Coercion Representation

[ghc-hetmet.git] / compiler / iface / IfaceSyn.lhs

diff --git a/compiler/iface/IfaceSyn.lhs b/compiler/iface/IfaceSyn.lhs
index 3eae7a3..48bef49 100644 (file)
--- a/compiler/iface/IfaceSyn.lhs
+++ b/compiler/iface/IfaceSyn.lhs
@@ -234,10 +234,11 @@ data IfaceExpr
   = IfaceLcl   IfLclName
   | IfaceExt    IfExtName
   | IfaceType   IfaceType
-  | IfaceTuple         Boxity [IfaceExpr]              -- Saturated; type arguments omitted
+  | IfaceCo     IfaceType              -- We re-use IfaceType for coercions
+  | IfaceTuple         Boxity [IfaceExpr]      -- Saturated; type arguments omitted
   | IfaceLam   IfaceBndr IfaceExpr
   | IfaceApp   IfaceExpr IfaceExpr
-  | IfaceCase  IfaceExpr IfLclName IfaceType [IfaceAlt]
+  | IfaceCase  IfaceExpr IfLclName [IfaceAlt]
   | IfaceLet   IfaceBinding  IfaceExpr
   | IfaceNote  IfaceNote IfaceExpr
   | IfaceCast   IfaceExpr IfaceCoercion
@@ -597,6 +598,7 @@ pprIfaceExpr _       (IfaceLit l)       = ppr l
 pprIfaceExpr _       (IfaceFCall cc ty) = braces (ppr cc <+> ppr ty)
 pprIfaceExpr _       (IfaceTick m ix)   = braces (text "tick" <+> ppr m <+> ppr ix)
 pprIfaceExpr _       (IfaceType ty)     = char '@' <+> pprParendIfaceType ty
+pprIfaceExpr _       (IfaceCo co)       = text "@~" <+> pprParendIfaceType co
 
 pprIfaceExpr add_par app@(IfaceApp _ _) = add_par (pprIfaceApp app [])
 pprIfaceExpr _       (IfaceTuple c as)  = tupleParens c (interpp'SP as)
@@ -609,14 +611,14 @@ pprIfaceExpr add_par e@(IfaceLam _ _)
     collect bs (IfaceLam b e) = collect (b:bs) e
     collect bs e              = (reverse bs, e)
 
-pprIfaceExpr add_par (IfaceCase scrut bndr ty [(con, bs, rhs)])
-  = add_par (sep [ptext (sLit "case") <+> char '@' <+> pprParendIfaceType ty
+pprIfaceExpr add_par (IfaceCase scrut bndr [(con, bs, rhs)])
+  = add_par (sep [ptext (sLit "case") 
                        <+> pprIfaceExpr noParens scrut <+> ptext (sLit "of") 
                        <+> ppr bndr <+> char '{' <+> ppr_con_bs con bs <+> arrow,
                  pprIfaceExpr noParens rhs <+> char '}'])
 
-pprIfaceExpr add_par (IfaceCase scrut bndr ty alts)
-  = add_par (sep [ptext (sLit "case") <+> char '@' <+> pprParendIfaceType ty
+pprIfaceExpr add_par (IfaceCase scrut bndr alts)
+  = add_par (sep [ptext (sLit "case") 
                        <+> pprIfaceExpr noParens scrut <+> ptext (sLit "of") 
                        <+> ppr bndr <+> char '{',
                  nest 2 (sep (map ppr_alt alts)) <+> char '}'])
@@ -788,6 +790,8 @@ freeNamesIfType (IfaceTyConApp tc ts) =
 freeNamesIfType (IfaceForAllTy tv t)  =
    freeNamesIfTvBndr tv &&& freeNamesIfType t
 freeNamesIfType (IfaceFunTy s t)      = freeNamesIfType s &&& freeNamesIfType t
+freeNamesIfType (IfaceCoConApp tc ts) = 
+   freeNamesIfCo tc &&& fnList freeNamesIfType ts
 
 freeNamesIfTvBndrs :: [IfaceTvBndr] -> NameSet
 freeNamesIfTvBndrs = fnList freeNamesIfTvBndr
@@ -830,16 +834,16 @@ freeNamesIfExpr :: IfaceExpr -> NameSet
 freeNamesIfExpr (IfaceExt v)     = unitNameSet v
 freeNamesIfExpr (IfaceFCall _ ty) = freeNamesIfType ty
 freeNamesIfExpr (IfaceType ty)    = freeNamesIfType ty
+freeNamesIfExpr (IfaceCo co)      = freeNamesIfType co
 freeNamesIfExpr (IfaceTuple _ as) = fnList freeNamesIfExpr as
 freeNamesIfExpr (IfaceLam b body) = freeNamesIfBndr b &&& freeNamesIfExpr body
 freeNamesIfExpr (IfaceApp f a)    = freeNamesIfExpr f &&& freeNamesIfExpr a
 freeNamesIfExpr (IfaceCast e co)  = freeNamesIfExpr e &&& freeNamesIfType co
 freeNamesIfExpr (IfaceNote _n r)   = freeNamesIfExpr r
 
-freeNamesIfExpr (IfaceCase s _ ty alts)
+freeNamesIfExpr (IfaceCase s _ alts)
   = freeNamesIfExpr s 
     &&& fnList fn_alt alts &&& fn_cons alts
-    &&& freeNamesIfType ty
   where
     fn_alt (_con,_bs,r) = freeNamesIfExpr r
 
@@ -865,6 +869,10 @@ freeNamesIfTc (IfaceTc tc) = unitNameSet tc
 -- ToDo: shouldn't we include IfaceIntTc & co.?
 freeNamesIfTc _ = emptyNameSet
 
+freeNamesIfCo :: IfaceCoCon -> NameSet
+freeNamesIfCo (IfaceCoAx tc) = unitNameSet tc
+freeNamesIfCo _ = emptyNameSet
+
 freeNamesIfRule :: IfaceRule -> NameSet
 freeNamesIfRule (IfaceRule { ifRuleBndrs = bs, ifRuleHead = f
                            , ifRuleArgs = es, ifRuleRhs = rhs })