-- Predicates.
-- Again, newtypes are opaque
tcEqType, tcEqPred, tcCmpType, tcCmpTypes, tcCmpPred,
- isQualifiedTy, isOverloadedTy, isStrictType, isStrictPred,
+ isQualifiedTy, isOverloadedTy,
isDoubleTy, isFloatTy, isIntTy,
- isIntegerTy, isAddrTy, isBoolTy, isUnitTy, isForeignPtrTy, isPrimitiveType,
+ isIntegerTy, isAddrTy, isBoolTy, isUnitTy, isForeignPtrTy,
isTauTy, tcIsTyVarTy, tcIsForAllTy,
---------------------------------
---------------------------------
-- Predicate types
- PredType, mkPredTy, mkPredTys, getClassPredTys_maybe, getClassPredTys,
+ PredType, getClassPredTys_maybe, getClassPredTys,
isPredTy, isClassPred, isTyVarClassPred, predHasFDs,
mkDictTy, tcSplitPredTy_maybe, predTyUnique,
- isDictTy, tcSplitDFunTy,
+ isDictTy, tcSplitDFunTy, predTyUnique,
mkClassPred, predMentionsIPs, inheritablePred, isIPPred, mkPredName,
---------------------------------
+ -- Foreign import and export
+ isFFIArgumentTy, -- :: DynFlags -> Safety -> Type -> Bool
+ isFFIImportResultTy, -- :: DynFlags -> Type -> Bool
+ isFFIExportResultTy, -- :: Type -> Bool
+ isFFIExternalTy, -- :: Type -> Bool
+ isFFIDynArgumentTy, -- :: Type -> Bool
+ isFFIDynResultTy, -- :: Type -> Bool
+ isFFILabelTy, -- :: Type -> Bool
+
+ ---------------------------------
-- Unifier and matcher
unifyTysX, unifyTyListsX, unifyExtendTysX,
allDistinctTyVars,
--------------------------------
-- Rexported from Type
- Kind, Type, SourceType(..), PredType, ThetaType,
- unliftedTypeKind, liftedTypeKind, openTypeKind, mkArrowKind, mkArrowKinds,
+ Kind, -- Stuff to do with kinds is insensitive to pre/post Tc
+ unliftedTypeKind, liftedTypeKind, openTypeKind, mkArrowKind, mkArrowKinds,
+ superBoxity, liftedBoxity, hasMoreBoxityInfo, defaultKind, superKind,
+ isTypeKind,
+
+ Type, SourceType(..), PredType, ThetaType,
mkForAllTy, mkForAllTys,
mkFunTy, mkFunTys, zipFunTys,
mkTyConApp, mkAppTy, mkAppTys, mkSynTy, applyTy, applyTys,
- mkTyVarTy, mkTyVarTys, mkTyConTy,
- predTyUnique, mkClassPred,
+ mkTyVarTy, mkTyVarTys, mkTyConTy, mkPredTy, mkPredTys,
+
isUnLiftedType, -- Source types are always lifted
isUnboxedTupleType, -- Ditto
+ isPrimitiveType,
+
tidyTopType, tidyType, tidyPred, tidyTypes, tidyFreeTyVars, tidyOpenType, tidyOpenTypes,
- tidyTyVar, tidyTyVars,
- eqKind, eqUsage,
+ tidyTyVarBndr, tidyOpenTyVar, tidyOpenTyVars,
+ typeKind, eqKind, eqUsage,
- -- Reexported ???
tyVarsOfType, tyVarsOfTypes, tyVarsOfPred, tyVarsOfTheta
) where
import {-# SOURCE #-} PprType( pprType )
-- friends:
-import TypeRep ( Type(..), TyNote(..) ) -- friend
-import Type -- Lots and lots
-import TyCon ( TyCon, isPrimTyCon, tyConArity, isNewTyCon )
-import Class ( classTyCon, classHasFDs, Class )
+import TypeRep ( Type(..), TyNote(..), funTyCon ) -- friend
+import Type ( mkUTyM, unUTy ) -- Used locally
+
+import Type ( -- Re-exports
+ tyVarsOfType, tyVarsOfTypes, tyVarsOfPred, tyVarsOfTheta,
+ Kind, Type, TauType, SourceType(..), PredType, ThetaType,
+ unliftedTypeKind, liftedTypeKind, openTypeKind, mkArrowKind, mkArrowKinds,
+ mkForAllTy, mkForAllTys, defaultKind, isTypeKind,
+ mkFunTy, mkFunTys, zipFunTys,
+ mkTyConApp, mkAppTy, mkAppTys, mkSynTy, applyTy, applyTys,
+ mkTyVarTy, mkTyVarTys, mkTyConTy, mkPredTy, mkPredTys,
+ isUnLiftedType, isUnboxedTupleType, isPrimitiveType,
+ splitNewType_maybe, splitTyConApp_maybe,
+ tidyTopType, tidyType, tidyPred, tidyTypes, tidyFreeTyVars, tidyOpenType, tidyOpenTypes,
+ tidyTyVarBndr, tidyOpenTyVar, tidyOpenTyVars, eqKind, eqUsage,
+ hasMoreBoxityInfo, liftedBoxity, superBoxity, typeKind, superKind
+ )
+import TyCon ( TyCon, isUnLiftedTyCon )
+import Class ( classHasFDs, Class )
import Var ( TyVar, tyVarKind )
+import ForeignCall ( Safety, playSafe )
import VarEnv
import VarSet
-- others:
-import CmdLineOpts ( opt_DictsStrict )
+import CmdLineOpts ( DynFlags, DynFlag( Opt_GlasgowExts ), dopt )
import Name ( Name, NamedThing(..), mkLocalName )
import OccName ( OccName, mkDictOcc )
import NameSet
-import PrelNames ( floatTyConKey, doubleTyConKey, foreignPtrTyConKey,
- integerTyConKey, intTyConKey, addrTyConKey, boolTyConKey )
-import Unique ( Unique, Uniquable(..), mkTupleTyConUnique )
+import PrelNames -- Lots (e.g. in isFFIArgumentTy)
+import TysWiredIn ( ptrTyCon, funPtrTyCon, addrTyCon, unitTyCon )
+import Unique ( Unique, Uniquable(..) )
import SrcLoc ( SrcLoc )
-import Util ( cmpList, thenCmp )
+import Util ( cmpList, thenCmp, equalLength )
import Maybes ( maybeToBool, expectJust )
-import BasicTypes ( Boxity(..) )
import Outputable
\end{code}
isTauTy (TyConApp _ tys) = all isTauTy tys
isTauTy (AppTy a b) = isTauTy a && isTauTy b
isTauTy (FunTy a b) = isTauTy a && isTauTy b
-isTauTy (SourceTy p) = isTauTy (sourceTypeRep p)
+isTauTy (SourceTy p) = True -- Don't look through source types
isTauTy (NoteTy _ ty) = isTauTy ty
isTauTy (UsageTy _ ty) = isTauTy ty
isTauTy other = False
tcSplitPredTy_maybe (UsageTy _ ty) = tcSplitPredTy_maybe ty
tcSplitPredTy_maybe (SourceTy p) | isPred p = Just p
tcSplitPredTy_maybe other = Nothing
-
-mkPredTy :: PredType -> Type
-mkPredTy pred = SourceTy pred
-
-mkPredTys :: ThetaType -> [Type]
-mkPredTys preds = map SourceTy preds
-
+
predTyUnique :: PredType -> Unique
predTyUnique (IParam n _) = getUnique n
predTyUnique (ClassP clas tys) = getUnique clas
isClassPred (ClassP clas tys) = True
isClassPred other = False
-isTyVarClassPred (ClassP clas tys) = all isTyVarTy tys
+isTyVarClassPred (ClassP clas tys) = all tcIsTyVarTy tys
isTyVarClassPred other = False
getClassPredTys_maybe :: SourceType -> Maybe (Class, [Type])
isIntTy = is_tc intTyConKey
isAddrTy = is_tc addrTyConKey
isBoolTy = is_tc boolTyConKey
-isUnitTy = is_tc (mkTupleTyConUnique Boxed 0)
+isUnitTy = is_tc unitTyConKey
is_tc :: Unique -> Type -> Bool
-- Newtypes are opaque to this
Nothing -> False
\end{code}
-\begin{code}
-isPrimitiveType :: Type -> Bool
--- Returns types that are opaque to Haskell.
--- Most of these are unlifted, but now that we interact with .NET, we
--- may have primtive (foreign-imported) types that are lifted
-isPrimitiveType ty = case splitTyConApp_maybe ty of
- Just (tc, ty_args) -> ASSERT( length ty_args == tyConArity tc )
- isPrimTyCon tc
- other -> False
-\end{code}
-
-@isStrictType@ computes whether an argument (or let RHS) should
-be computed strictly or lazily, based only on its type
-
-\begin{code}
-isStrictType :: Type -> Bool
-isStrictType ty
- | isUnLiftedType ty = True
- | Just pred <- tcSplitPredTy_maybe ty = isStrictPred pred
- | otherwise = False
-
-isStrictPred (ClassP clas _) = opt_DictsStrict
- && not (isNewTyCon (classTyCon clas))
-isStrictPred pred = False
- -- We may be strict in dictionary types, but only if it
- -- has more than one component.
- -- [Being strict in a single-component dictionary risks
- -- poking the dictionary component, which is wrong.]
-\end{code}
-
%************************************************************************
%* *
%************************************************************************
%* *
+\subsection[TysWiredIn-ext-type]{External types}
+%* *
+%************************************************************************
+
+The compiler's foreign function interface supports the passing of a
+restricted set of types as arguments and results (the restricting factor
+being the )
+
+\begin{code}
+isFFIArgumentTy :: DynFlags -> Safety -> Type -> Bool
+-- Checks for valid argument type for a 'foreign import'
+isFFIArgumentTy dflags safety ty
+ = checkRepTyCon (legalOutgoingTyCon dflags safety) ty
+
+isFFIExternalTy :: Type -> Bool
+-- Types that are allowed as arguments of a 'foreign export'
+isFFIExternalTy ty = checkRepTyCon legalFEArgTyCon ty
+
+isFFIImportResultTy :: DynFlags -> Type -> Bool
+isFFIImportResultTy dflags ty
+ = checkRepTyCon (legalFIResultTyCon dflags) ty
+
+isFFIExportResultTy :: Type -> Bool
+isFFIExportResultTy ty = checkRepTyCon legalFEResultTyCon ty
+
+isFFIDynArgumentTy :: Type -> Bool
+-- The argument type of a foreign import dynamic must be Ptr, FunPtr, Addr,
+-- or a newtype of either.
+isFFIDynArgumentTy = checkRepTyCon (\tc -> tc == ptrTyCon || tc == funPtrTyCon || tc == addrTyCon)
+
+isFFIDynResultTy :: Type -> Bool
+-- The result type of a foreign export dynamic must be Ptr, FunPtr, Addr,
+-- or a newtype of either.
+isFFIDynResultTy = checkRepTyCon (\tc -> tc == ptrTyCon || tc == funPtrTyCon || tc == addrTyCon)
+
+isFFILabelTy :: Type -> Bool
+-- The type of a foreign label must be Ptr, FunPtr, Addr,
+-- or a newtype of either.
+isFFILabelTy = checkRepTyCon (\tc -> tc == ptrTyCon || tc == funPtrTyCon || tc == addrTyCon)
+
+checkRepTyCon :: (TyCon -> Bool) -> Type -> Bool
+ -- Look through newtypes
+ -- Non-recursive ones are transparent to splitTyConApp,
+ -- but recursive ones aren't; hence the splitNewType_maybe
+checkRepTyCon check_tc ty
+ | Just ty' <- splitNewType_maybe ty = checkRepTyCon check_tc ty'
+ | Just (tc,_) <- splitTyConApp_maybe ty = check_tc tc
+ | otherwise = False
+\end{code}
+
+----------------------------------------------
+These chaps do the work; they are not exported
+----------------------------------------------
+
+\begin{code}
+legalFEArgTyCon :: TyCon -> Bool
+-- It's illegal to return foreign objects and (mutable)
+-- bytearrays from a _ccall_ / foreign declaration
+-- (or be passed them as arguments in foreign exported functions).
+legalFEArgTyCon tc
+ | getUnique tc `elem` [ foreignObjTyConKey, foreignPtrTyConKey,
+ byteArrayTyConKey, mutableByteArrayTyConKey ]
+ = False
+ -- It's also illegal to make foreign exports that take unboxed
+ -- arguments. The RTS API currently can't invoke such things. --SDM 7/2000
+ | otherwise
+ = boxedMarshalableTyCon tc
+
+legalFIResultTyCon :: DynFlags -> TyCon -> Bool
+legalFIResultTyCon dflags tc
+ | getUnique tc `elem`
+ [ foreignObjTyConKey, foreignPtrTyConKey,
+ byteArrayTyConKey, mutableByteArrayTyConKey ] = False
+ | tc == unitTyCon = True
+ | otherwise = marshalableTyCon dflags tc
+
+legalFEResultTyCon :: TyCon -> Bool
+legalFEResultTyCon tc
+ | getUnique tc `elem`
+ [ foreignObjTyConKey, foreignPtrTyConKey,
+ byteArrayTyConKey, mutableByteArrayTyConKey ] = False
+ | tc == unitTyCon = True
+ | otherwise = boxedMarshalableTyCon tc
+
+legalOutgoingTyCon :: DynFlags -> Safety -> TyCon -> Bool
+-- Checks validity of types going from Haskell -> external world
+legalOutgoingTyCon dflags safety tc
+ | playSafe safety && getUnique tc `elem` [byteArrayTyConKey, mutableByteArrayTyConKey]
+ = False
+ | otherwise
+ = marshalableTyCon dflags tc
+
+marshalableTyCon dflags tc
+ = (dopt Opt_GlasgowExts dflags && isUnLiftedTyCon tc)
+ || boxedMarshalableTyCon tc
+
+boxedMarshalableTyCon tc
+ = getUnique tc `elem` [ intTyConKey, int8TyConKey, int16TyConKey
+ , int32TyConKey, int64TyConKey
+ , wordTyConKey, word8TyConKey, word16TyConKey
+ , word32TyConKey, word64TyConKey
+ , floatTyConKey, doubleTyConKey
+ , addrTyConKey, ptrTyConKey, funPtrTyConKey
+ , charTyConKey, foreignObjTyConKey
+ , foreignPtrTyConKey
+ , stablePtrTyConKey
+ , byteArrayTyConKey, mutableByteArrayTyConKey
+ , boolTyConKey
+ ]
+\end{code}
+
+
+%************************************************************************
+%* *
\subsection{Unification with an explicit substitution}
%* *
%************************************************************************
| tyvar2 `elemVarSet` tmpls
= uVarX tyvar2 ty1 k subst
+ -- Predicates
+uTysX (SourceTy (IParam n1 t1)) (SourceTy (IParam n2 t2)) k subst
+ | n1 == n2 = uTysX t1 t2 k subst
+uTysX (SourceTy (ClassP c1 tys1)) (SourceTy (ClassP c2 tys2)) k subst
+ | c1 == c2 = uTyListsX tys1 tys2 k subst
+uTysX (SourceTy (NType tc1 tys1)) (SourceTy (NType tc2 tys2)) k subst
+ | tc1 == tc2 = uTyListsX tys1 tys2 k subst
+
-- Functions; just check the two parts
uTysX (FunTy fun1 arg1) (FunTy fun2 arg2) k subst
= uTysX fun1 fun2 (uTysX arg1 arg2 k) subst
-- Type constructors must match
uTysX (TyConApp con1 tys1) (TyConApp con2 tys2) k subst
- | (con1 == con2 && length tys1 == length tys2)
+ | (con1 == con2 && equalLength tys1 tys2)
= uTyListsX tys1 tys2 k subst
-- Applications need a bit of care!
-- variable may not match the pattern (TyVarTy v') as one would
-- expect, due to an intervening Note. KSW 2000-06.
+ -- Predicates
+match (SourceTy (IParam n1 t1)) (SourceTy (IParam n2 t2)) tmpls k senv
+ | n1 == n2 = match t1 t2 tmpls k senv
+match (SourceTy (ClassP c1 tys1)) (SourceTy (ClassP c2 tys2)) tmpls k senv
+ | c1 == c2 = match_list_exactly tys1 tys2 tmpls k senv
+match (SourceTy (NType tc1 tys1)) (SourceTy (NType tc2 tys2)) tmpls k senv
+ | tc1 == tc2 = match_list_exactly tys1 tys2 tmpls k senv
+
+ -- Functions; just check the two parts
match (FunTy arg1 res1) (FunTy arg2 res2) tmpls k senv
= match arg1 arg2 tmpls (match res1 res2 tmpls k) senv
Nothing -> Nothing -- Fail
match (TyConApp tc1 tys1) (TyConApp tc2 tys2) tmpls k senv
- | tc1 == tc2 = match_tc_app tys1 tys2 tmpls k senv
+ | tc1 == tc2 = match_list_exactly tys1 tys2 tmpls k senv
-- Newtypes are opaque; other source types should not happen
match (SourceTy (NType tc1 tys1)) (SourceTy (NType tc2 tys2)) tmpls k senv
- | tc1 == tc2 = match_tc_app tys1 tys2 tmpls k senv
+ | tc1 == tc2 = match_list_exactly tys1 tys2 tmpls k senv
match (UsageTy _ ty1) ty2 tmpls k senv = match ty1 ty2 tmpls k senv
match ty1 (UsageTy _ ty2) tmpls k senv = match ty1 ty2 tmpls k senv
-- Catch-all fails
match _ _ _ _ _ = Nothing
-match_tc_app tys1 tys2 tmpls k senv
+match_list_exactly tys1 tys2 tmpls k senv
= match_list tys1 tys2 tmpls k' senv
where
k' (senv', tys2') | null tys2' = k senv' -- Succeed
projects / ghc-hetmet.git / blobdiff