better error reporting in coreTypeToWeakType; dont use Prelude_error

[coq-hetmet.git] / src / Extraction-prefix.hs

diff --git a/src/Extraction-prefix.hs b/src/Extraction-prefix.hs
index 4abbf69..7fb0160 100644 (file)
--- a/src/Extraction-prefix.hs
+++ b/src/Extraction-prefix.hs
@@ -1,11 +1,14 @@
-{-# OPTIONS_GHC -fno-warn-unused-binds  #-}
+{-# OPTIONS_GHC -fno-warn-unused-matches -fno-warn-unused-binds -fno-warn-unused-imports #-}

 module CoqPass ( coqPassCoreToString, coqPassCoreToCore )
 where
 module CoqPass ( coqPassCoreToString, coqPassCoreToCore )
 where

+import qualified Unique
+import qualified UniqSupply

 import qualified MkCore
 import qualified TysWiredIn
 import qualified TysPrim
 import qualified Outputable
 import qualified PrelNames
 import qualified MkCore
 import qualified TysWiredIn
 import qualified TysPrim
 import qualified Outputable
 import qualified PrelNames

+import qualified OccName

 import qualified Name
 import qualified Literal
 import qualified Type
 import qualified Name
 import qualified Literal
 import qualified Type

@@ -19,46 +22,56 @@ import qualified FastString
 import qualified BasicTypes
 import qualified DataCon
 import qualified CoreSyn
 import qualified BasicTypes
 import qualified DataCon
 import qualified CoreSyn

+import qualified CoreUtils

 import qualified Class
 import qualified Data.Char 
 import qualified Class
 import qualified Data.Char 

+import qualified Data.List
+import qualified Data.Ord
+import qualified Data.Typeable

 import Data.Bits ((.&.), shiftL, (.|.))
 import Data.Bits ((.&.), shiftL, (.|.))

-import Prelude ( (++), (+), (==), Show, show, Char )
+import Prelude ( (++), (+), (==), Show, show, (.), ($) )

 import qualified Prelude
 import qualified GHC.Base
 import qualified Prelude
 import qualified GHC.Base

+import qualified System.IO.Unsafe

 
 

--- used for extracting strings
-bin2ascii =
-  (\ b0 b1 b2 b3 b4 b5 b6 b7 ->
-     let f b i = if b then 1 `shiftL` i else 0
-     in Data.Char.chr (f b0 0 .|. f b1 1 .|. f b2 2 .|. f b3 3 .|. f b4 4 .|. f b5 5 .|. f b6 6 .|. f b7 7))
---bin2ascii' =
---  (\ f c -> let n = Char.code c in let h i = (n .&. (1 `shiftL` i)) /= 0 in f (h 0) (h 1) (h 2) (h 3) (h 4) (h 5) (h 6) (h 7))
---shiftAscii =
---  \ b c -> Data.Char.chr (((Char.code c) `shiftL` 1) .&. 255 .|. if b then 1 else 0)
+getTyConTyVars :: TyCon.TyCon -> [Var.TyVar]
+getTyConTyVars tc =
+  if TyCon.isFunTyCon tc
+  then []
+  else if TyCon.isPrimTyCon tc
+       then []
+       else TyCon.tyConTyVars tc

 
 

--- crude way of casting Coq "error monad" into Haskell exceptions
-errOrFail :: OrError a -> a
-errOrFail (OK x)    = x
-errOrFail (Error s) = Prelude.error s
+cmpAlts :: (CoreSyn.AltCon,[Var.Var],CoreSyn.Expr Var.Var) -> (CoreSyn.AltCon,[Var.Var],CoreSyn.Expr Var.Var) -> Data.Ord.Ordering
+cmpAlts (CoreSyn.DEFAULT,_,_) _   = Data.Ord.LT
+cmpAlts _ (CoreSyn.DEFAULT,_,_)   = Data.Ord.GT
+cmpAlts (a1,_,_) (a2,_,_)         = Data.Ord.compare a2 a1

 
 

-getTyConTyVars :: TyCon.TyCon -> [Var.TyVar]
-getTyConTyVars tc = if TyCon.isFunTyCon tc then [] else if TyCon.isPrimTyCon tc then [] else TyCon.tyConTyVars tc
+sortAlts :: [(CoreSyn.AltCon,[Var.Var],CoreSyn.Expr Var.Var)] -> [(CoreSyn.AltCon,[Var.Var],CoreSyn.Expr Var.Var)]
+sortAlts x = Data.List.sortBy (\a b -> if a `CoreSyn.ltAlt` b then Data.Ord.LT else Data.Ord.GT) x

 
 

--- to do: this could be moved into Coq
-coreVarToWeakVar :: Var.Var -> WeakVar
-coreVarToWeakVar v | Id.isId     v = WExprVar (WeakExprVar v (errOrFail (coreTypeToWeakType (Var.varType v))))
-coreVarToWeakVar v | Var.isTyVar v = WTypeVar (WeakTypeVar v (coreKindToKind (Var.varType v)))
-coreVarToWeakVar v | Var.isCoVar v = WCoerVar (WeakCoerVar v (Prelude.error "FIXME") (Prelude.error "FIXME"))
-coreVarToWeakVar _                 =
-   Prelude.error "Var.Var that is neither an expression variable, type variable, nor coercion variable!"
+coreVarToWeakVar :: Var.Var -> CoreVarToWeakVarResult
+coreVarToWeakVar v | Id.isId     v = CVTWVR_EVar  (Var.varType v)
+coreVarToWeakVar v | Var.isTyVar v = CVTWVR_TyVar (coreKindToKind (Var.varType v))
+coreVarToWeakVar v | Var.isCoVar v = CVTWVR_CoVar (Prelude.fst (Coercion.coercionKind (Var.varType v)))
+                                                  (Prelude.snd (Coercion.coercionKind (Var.varType v)))
+coreVarToWeakVar _                 = Prelude.error "Var.Var that is neither an expression, type variable, nor coercion variable!"

 
 

-tyConOrTyFun :: TyCon.TyCon -> Prelude.Either TyCon.TyCon TyCon.TyCon
---FIXME: go back to this
---tyConOrTyFun n = if TyCon.isFamInstTyCon n then Prelude.Left n else Prelude.Right n
-tyConOrTyFun n = if TyCon.isFamInstTyCon n then Prelude.Left n else Prelude.Left n
+rawTyFunKind :: TyCon.TyCon -> ( [Kind] , Kind )
+rawTyFunKind tc = ((Prelude.map coreKindToKind (Prelude.take (TyCon.tyConArity tc) argk))
+                  ,
+                   coreKindToKind (Coercion.mkArrowKinds (Prelude.drop (TyCon.tyConArity tc) argk) retk))
+                   where (argk,retk) = Coercion.splitKindFunTys (TyCon.tyConKind tc)

 
 

-tyFunResultKind :: TyCon.TyCon -> Kind
-tyFunResultKind tc = coreKindToKind (TyCon.tyConKind tc)
+tyConOrTyFun :: TyCon.TyCon -> Prelude.Either TyCon.TyCon TyCon.TyCon
+tyConOrTyFun n =
+   if n == TysPrim.statePrimTyCon     -- special-purpose hack treat State# as a type family since it has kind *->* but no tyvars
+   then Prelude.Right n
+   else if TyCon.isFamInstTyCon n
+        then Prelude.Right n
+        else if TyCon.isSynTyCon n
+             then Prelude.Right n
+             else Prelude.Left n

 
 nat2int :: Nat -> Prelude.Int
 nat2int O     = 0
 
 nat2int :: Nat -> Prelude.Int
 nat2int O     = 0

@@ -67,37 +80,44 @@ nat2int (S x) = 1 + (nat2int x)
 natToString :: Nat -> Prelude.String
 natToString n = show (nat2int n)
 
 natToString :: Nat -> Prelude.String
 natToString n = show (nat2int n)
 

--- only needs to sanitize characters which might appear in Haskell identifiers

 sanitizeForLatex :: Prelude.String -> Prelude.String
 sanitizeForLatex :: Prelude.String -> Prelude.String

-sanitizeForLatex []    = []
+sanitizeForLatex []      = []

 sanitizeForLatex ('_':x) = "\\_"++(sanitizeForLatex x)
 sanitizeForLatex ('$':x) = "\\$"++(sanitizeForLatex x)
 sanitizeForLatex ('#':x) = "\\#"++(sanitizeForLatex x)
 sanitizeForLatex ('_':x) = "\\_"++(sanitizeForLatex x)
 sanitizeForLatex ('$':x) = "\\$"++(sanitizeForLatex x)
 sanitizeForLatex ('#':x) = "\\#"++(sanitizeForLatex x)

-sanitizeForLatex (c:x) = c:(sanitizeForLatex x)
+sanitizeForLatex (c:x)   = c:(sanitizeForLatex x)

 
 

+kindToCoreKind :: Kind -> TypeRep.Kind
+kindToCoreKind KindStar          = TypeRep.liftedTypeKind
+kindToCoreKind (KindArrow k1 k2) = Coercion.mkArrowKind (kindToCoreKind k1) (kindToCoreKind k2)
+kindToCoreKind k                 = Prelude.error ((Prelude.++)
+                                                    "kindToCoreKind does not know how to handle kind "
+                                                                               (kindToString k))

 coreKindToKind :: TypeRep.Kind -> Kind
 coreKindToKind k =
   case Coercion.splitKindFunTy_maybe k of
 coreKindToKind :: TypeRep.Kind -> Kind
 coreKindToKind k =
   case Coercion.splitKindFunTy_maybe k of

-      Prelude.Just (k1,k2) -> KindTypeFunction (coreKindToKind k1) (coreKindToKind k2)
+      Prelude.Just (k1,k2) -> KindArrow (coreKindToKind k1) (coreKindToKind k2)

       Prelude.Nothing -> 
       Prelude.Nothing -> 

-                      if      (Coercion.isLiftedTypeKind k)   then KindType
-                 else if (Coercion.isUnliftedTypeKind k) then KindUnliftedType
-                 else if (Coercion.isOpenTypeKind k)     then KindOpenType
-                 else if (Coercion.isArgTypeKind k)      then KindArgType
-                 else if (Coercion.isUbxTupleKind k)     then KindUnboxedTuple
+                      if (Coercion.isLiftedTypeKind k)   then KindStar
+                 else if (Coercion.isUnliftedTypeKind k) then KindStar
+                 else if (Coercion.isArgTypeKind k)      then KindStar
+                 else if (Coercion.isUbxTupleKind k)     then KindStar
+                 else if (Coercion.isOpenTypeKind k)     then KindStar
+--
+-- The "subkinding" in GHC is not dealt with in System FC, and dealing
+-- with it is not actually as simple as you'd think.
+--
+--                 else if (Coercion.isUnliftedTypeKind k) then KindUnliftedType
+--                 else if (Coercion.isOpenTypeKind k)     then KindOpenType
+--                 else if (Coercion.isArgTypeKind k)      then KindArgType
+--                 else if (Coercion.isUbxTupleKind k)     then KindUnboxedTuple
+--

                  else if (Coercion.isTySuperKind k)      then Prelude.error "coreKindToKind got the kind-of-the-kind-of-types"
                  else if (Coercion.isCoSuperKind k)      then Prelude.error "coreKindToKind got the kind-of-the-kind-of-coercions"
                  else                                         Prelude.error ((Prelude.++) "coreKindToKind got an unknown kind: "
                                                                                (Outputable.showSDoc (Outputable.ppr k)))
 outputableToString :: Outputable.Outputable a => a -> Prelude.String
                  else if (Coercion.isTySuperKind k)      then Prelude.error "coreKindToKind got the kind-of-the-kind-of-types"
                  else if (Coercion.isCoSuperKind k)      then Prelude.error "coreKindToKind got the kind-of-the-kind-of-coercions"
                  else                                         Prelude.error ((Prelude.++) "coreKindToKind got an unknown kind: "
                                                                                (Outputable.showSDoc (Outputable.ppr k)))
 outputableToString :: Outputable.Outputable a => a -> Prelude.String

-outputableToString = (\x -> Outputable.showSDoc (Outputable.ppr x))
-
--- TO DO: I think we can remove this now
-checkTypeEquality :: Type.Type -> Type.Type -> Prelude.Bool
-checkTypeEquality t1 t2 = Type.tcEqType (Type.expandTypeSynonyms t1) (Type.expandTypeSynonyms t2)
-
---showType t = outputableToString (Type.expandTypeSynonyms t)
-showType t = outputableToString (coreViewDeep t)
+outputableToString = (\x -> Outputable.showSDocDebug (Outputable.ppr x))

 
 coreViewDeep :: Type.Type -> Type.Type
 coreViewDeep t =
 
 coreViewDeep :: Type.Type -> Type.Type
 coreViewDeep t =

@@ -113,3 +133,74 @@ coreViewDeep t =
       TypeRep.PredTy p         -> case Type.coreView t of
                                Prelude.Nothing     -> TypeRep.PredTy p
                                Prelude.Just    t'  -> t'
       TypeRep.PredTy p         -> case Type.coreView t of
                                Prelude.Nothing     -> TypeRep.PredTy p
                                Prelude.Just    t'  -> t'

+
+getSourceAndTargetTypesOfCoercion :: Type.Type -> (Type.Type,Type.Type)
+getSourceAndTargetTypesOfCoercion c = Coercion.coercionKind (Coercion.typeKind c)
+
+{-
+-- REMEMBER: cotycon applications may be oversaturated
+ case c of
+  TypeRep.TyVarTy  v     -> WCoVar (WeakCoerVar v (Prelude.error "FIXME") (Prelude.error "FIXME") (Prelude.error "FIXME"))
+  TypeRep.AppTy    t1 t2 -> WCoApp   (coreCoercionToWeakCoercion t1) (coreCoercionToWeakCoercion t2)
+  TypeRep.TyConApp tc t  ->
+      case TyCon.isCoercionTyCon_maybe tc of
+        Prelude.Nothing -> Prelude.error ((Prelude.++) "coreCoercionToWeakCoercion got isCoercionTyCon_maybe " (outputableToString c))
+        Prelude.Just (_, ctcd) ->
+            case (ctcd,t) of
+              (TyCon.CoTrans , [x,y]     ) -> WCoComp   (coreCoercionToWeakCoercion x) (coreCoercionToWeakCoercion y)
+              (TyCon.CoSym   , [x]       ) -> WCoSym    (coreCoercionToWeakCoercion x)
+              (TyCon.CoLeft  , [x]       ) -> WCoLeft   (coreCoercionToWeakCoercion x)
+              (TyCon.CoRight , [x]       ) -> WCoLeft   (coreCoercionToWeakCoercion x)
+--            (TyCon.CoUnsafe, [t1, t2 ] ) -> WCoUnsafe (coreTypeToWeakType t1) (coreTypeToWeakType t2)
+              (TyCon.CoTrans , []        ) -> Prelude.error "CoTrans is not in post-publication-appendix SystemFC1"
+              (TyCon.CoCsel1 , []        ) -> Prelude.error "CoCsel1 is not in post-publication-appendix SystemFC1"
+              (TyCon.CoCsel2 , []        ) -> Prelude.error "CoCsel2 is not in post-publication-appendix SystemFC1"
+              (TyCon.CoCselR , []        ) -> Prelude.error "CoCselR is not in post-publication-appendix SystemFC1"
+              (TyCon.CoInst  , []        ) -> Prelude.error "CoInst  is not in post-publication-appendix SystemFC1"
+              (TyCon.CoAxiom _ _ _ , _   ) -> Prelude.error "CoAxiom is not yet implemented (FIXME)"
+              ( _, [ t1 , t2 ]) -> WCoUnsafe (errOrFail (coreTypeToWeakType t1)) (errOrFail (coreTypeToWeakType t2))
+              _ -> Prelude.error ((Prelude.++) "coreCoercionToWeakCoercion got " (outputableToString c))
+  _ -> Prelude.error ((Prelude.++) "coreCoercionToWeakCoercion got " (outputableToString c))
+-}
+--  TypeRep.ForAllTy v t   -> WCoAll  (Prelude.error "FIXME") (coreTypeToWeakType t)
+-- FIXME   x y                                  -> WCoAppT    (coreCoercionToWeakCoercion x) (coreCoercionToWeakType y)
+--  CoreSyn.Type t                            -> WCoType   (coreTypeToWeakType t)
+
+{-
+weakCoercionToCoreCoercion :: CoreCoercion -> Type.Type
+| WCoVar     (weakCoerVar _ _ t1 t2) => (t1,t2)
+| WCoType    t                       => Prelude_error "FIXME WCoType"
+| WCoApp     c1 c2                   => Prelude_error "FIXME WCoApp"
+| WCoAppT    c t                     => Prelude_error "FIXME WCoAppT"
+| WCoAll     k f                     => Prelude_error "FIXME WCoAll"
+| WCoSym     c                       => let (t2,t1) := weakCoercionTypes c in (t1,t2)
+| WCoComp    c1 c2                   => Prelude_error "FIXME WCoComp"
+| WCoLeft    c                       => Prelude_error "FIXME WCoLeft"
+| WCoRight   c                       => Prelude_error "FIXME WCoRight"
+| WCoUnsafe  t1 t2                   => (t1,t2)
+-}
+
+{-# NOINLINE trace #-}
+trace :: Prelude.String -> a -> a
+trace msg x = x
+
+--trace = Debug.Trace.trace
+--trace msg x = x
+--trace msg x = System.IO.Unsafe.unsafePerformIO $ Prelude.return x
+--trace s x = x
+--trace msg x = System.IO.Unsafe.unsafePerformIO $
+--                (Prelude.>>=) (System.IO.hPutStrLn System.IO.stdout msg) (\_ -> Prelude.return x)
+--trace msg x = System.IO.Unsafe.unsafePerformIO $
+--                (Prelude.>>=) (System.IO.hPutStr System.IO.stdout " ") (\_ -> Prelude.return x)
+
+
+{-  -- used for extracting strings WITHOUT the patch for Coq
+bin2ascii =
+  (\ b0 b1 b2 b3 b4 b5 b6 b7 ->
+     let f b i = if b then 1 `shiftL` i else 0
+     in Data.Char.chr (f b0 0 .|. f b1 1 .|. f b2 2 .|. f b3 3 .|. f b4 4 .|. f b5 5 .|. f b6 6 .|. f b7 7))
+-}
+
+-- I'm leaving this here (commented out) in case I ever need it again)
+--checkTypeEquality :: Type.Type -> Type.Type -> Prelude.Bool
+--checkTypeEquality t1 t2 = Type.tcEqType (Type.expandTypeSynonyms t1) (Type.expandTypeSynonyms t2)