Make idInfo fail more informatively on TyVars

[ghc-hetmet.git] / compiler / basicTypes / Var.lhs

diff --git a/compiler/basicTypes/Var.lhs b/compiler/basicTypes/Var.lhs
index 017e355..566d502 100644 (file)
--- a/compiler/basicTypes/Var.lhs
+++ b/compiler/basicTypes/Var.lhs
@@ -1,4 +1,5 @@
 %
+% (c) The University of Glasgow 2006
 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
 %
 \section{@Vars@: Variables}
@@ -35,16 +36,16 @@ module Var (
 
 #include "HsVersions.h"
 
-import {-# SOURCE #-}  TypeRep( Type, Kind, isCoSuperKind )
+import {-# SOURCE #-}  TypeRep( Type, Kind )
 import {-# SOURCE #-}  TcType( TcTyVarDetails, pprTcTyVarDetails )
-import {-# SOURCE #-}  IdInfo( GlobalIdDetails, notGlobalId, IdInfo, seqIdInfo )
-
-import Name            ( Name, NamedThing(..),
-                         setNameUnique, nameUnique, mkSysTvName, 
-                          mkSystemVarName
-                       )
-import Unique          ( Unique, Uniquable(..), mkUniqueGrimily, getKey#,
-                          mkBuiltinUnique )
+import {-# SOURCE #-}  IdInfo( GlobalIdDetails, notGlobalId, 
+                                IdInfo, seqIdInfo )
+#ifdef DEBUG
+import {-# SOURCE #-}  TypeRep( isCoercionKind )
+#endif
+
+import Name hiding (varName)
+import Unique
 import FastTypes
 import FastString
 import Outputable       
@@ -87,7 +88,7 @@ data Var
        varName    :: !Name,    -- Always an External or WiredIn Name
        realUnique :: FastInt,
        idType     :: Type,
-       idInfo     :: IdInfo,
+       idInfo_    :: IdInfo,
        gblDetails :: GlobalIdDetails }
 
   | LocalId {                  -- Used for locally-defined Ids 
@@ -95,7 +96,7 @@ data Var
        varName    :: !Name,
        realUnique :: FastInt,
        idType     :: Type,
-       idInfo     :: IdInfo,
+       idInfo_    :: IdInfo,
        lclDetails :: LocalIdDetails }
 
 data LocalIdDetails 
@@ -190,7 +191,8 @@ setTyVarKind tv k = tv {tyVarKind = k}
 
 \begin{code}
 mkTyVar :: Name -> Kind -> TyVar
-mkTyVar name kind = TyVar { varName    = name
+mkTyVar name kind = ASSERT( not (isCoercionKind kind ) )
+                   TyVar { varName    = name
                          , realUnique = getKey# (nameUnique name)
                          , tyVarKind  = kind
                           , isCoercionVar    = False
@@ -198,22 +200,12 @@ mkTyVar name kind = TyVar { varName    = name
 
 mkTcTyVar :: Name -> Kind -> TcTyVarDetails -> TyVar
 mkTcTyVar name kind details
-  = TcTyVar {  varName    = name,
+  = ASSERT( not (isCoercionKind kind) )
+    TcTyVar {  varName    = name,
                realUnique = getKey# (nameUnique name),
                tyVarKind  = kind,
                tcTyVarDetails = details
        }
-
-mkWildCoVar :: Kind -> TyVar
--- A type variable that is never referred to,
--- so its unique doesn't matter
-mkWildCoVar kind 
-  = TyVar { varName = mkSysTvName wild_uniq FSLIT("co_wild"),
-            realUnique = _ILIT(1),
-            tyVarKind = kind,
-            isCoercionVar = True }
-  where
-    wild_uniq = mkBuiltinUnique 1
 \end{code}
 
 %************************************************************************
@@ -231,12 +223,24 @@ setCoVarUnique = setVarUnique
 setCoVarName   = setVarName
 
 mkCoVar :: Name -> Kind -> CoVar
-mkCoVar name kind = TyVar { varName    = name
+mkCoVar name kind = ASSERT( isCoercionKind kind )
+                   TyVar { varName    = name
                          , realUnique = getKey# (nameUnique name)
                          , tyVarKind  = kind
                           , isCoercionVar    = True
                        }
 
+mkWildCoVar :: Kind -> TyVar
+-- A type variable that is never referred to,
+-- so its unique doesn't matter
+mkWildCoVar kind 
+  = ASSERT( isCoercionKind kind )
+    TyVar { varName = mkSysTvName wild_uniq FSLIT("co_wild"),
+            realUnique = _ILIT(1),
+            tyVarKind = kind,
+            isCoercionVar = True }
+  where
+    wild_uniq = mkBuiltinUnique 1
 \end{code}
 
 %************************************************************************
@@ -280,25 +284,30 @@ globaliseId :: GlobalIdDetails -> Id -> Id
 globaliseId details id = GlobalId { varName    = varName id,
                                    realUnique = realUnique id,
                                    idType     = idType id,
-                                   idInfo     = idInfo id,
+                                   idInfo_    = idInfo id,
                                    gblDetails = details }
 
+idInfo :: Id -> IdInfo
+idInfo (GlobalId {idInfo_ = info}) = info
+idInfo (LocalId  {idInfo_ = info}) = info
+idInfo other_var                  = pprPanic "idInfo" (ppr other_var)
+
 lazySetIdInfo :: Id -> IdInfo -> Id
-lazySetIdInfo id info = id {idInfo = info}
+lazySetIdInfo id info = id {idInfo_ = info}
 
 setIdInfo :: Id -> IdInfo -> Id
-setIdInfo id info = seqIdInfo info `seq` id {idInfo = info}
+setIdInfo id info = seqIdInfo info `seq` id {idInfo_ = info}
        -- Try to avoid spack leaks by seq'ing
 
 modifyIdInfo :: (IdInfo -> IdInfo) -> Id -> Id
 modifyIdInfo fn id
-  = seqIdInfo new_info `seq` id {idInfo = new_info}
+  = seqIdInfo new_info `seq` id {idInfo_ = new_info}
   where
     new_info = fn (idInfo id)
 
 -- maybeModifyIdInfo tries to avoid unnecesary thrashing
 maybeModifyIdInfo :: Maybe IdInfo -> Id -> Id
-maybeModifyIdInfo (Just new_info) id = id {idInfo = new_info}
+maybeModifyIdInfo (Just new_info) id = id {idInfo_ = new_info}
 maybeModifyIdInfo Nothing        id = id
 \end{code}
 
@@ -315,7 +324,7 @@ mkGlobalId details name ty info
                realUnique = getKey# (nameUnique name),         -- Cache the unique
                idType     = ty,        
                gblDetails = details,
-               idInfo     = info }
+               idInfo_    = info }
 
 mk_local_id :: Name -> Type -> LocalIdDetails -> IdInfo -> Id
 mk_local_id name ty details info
@@ -323,7 +332,7 @@ mk_local_id name ty details info
                realUnique = getKey# (nameUnique name),         -- Cache the unique
                idType     = ty,        
                lclDetails = details,
-               idInfo     = info }
+               idInfo_    = info }
 
 mkLocalId :: Name -> Type -> IdInfo -> Id
 mkLocalId name ty info = mk_local_id name ty NotExported info