%
+% (c) The University of Glasgow 2006
% (c) The AQUA Project, Glasgow University, 1998
%
-\section[DsCCall]{Desugaring \tr{foreign} declarations}
-Expanding out @foreign import@ and @foreign export@ declarations.
+Desugaring foreign declarations (see also DsCCall).
\begin{code}
module DsForeign ( dsForeigns ) where
import CoreSyn
-import DsCCall ( dsCCall, mkFCall, boxResult, unboxArg, resultWrapper )
+import DsCCall
import DsMonad
-import HsSyn ( ForeignDecl(..), ForeignExport(..), LForeignDecl,
- ForeignImport(..), CImportSpec(..) )
-import DataCon ( splitProductType_maybe )
-#ifdef DEBUG
-import DataCon ( dataConSourceArity )
-import Type ( isUnLiftedType )
-#endif
-import MachOp ( machRepByteWidth, MachRep(..) )
-import SMRep ( argMachRep, typeCgRep )
-import CoreUtils ( exprType, mkInlineMe )
-import Id ( Id, idType, idName, mkSysLocal, setInlinePragma )
-import Literal ( Literal(..), mkStringLit )
-import Module ( moduleFS )
-import Name ( getOccString, NamedThing(..) )
-import Type ( repType, coreEqType )
-import TcType ( Type, mkFunTys, mkForAllTys, mkTyConApp,
- mkFunTy, tcSplitTyConApp_maybe, tcSplitIOType_maybe,
- tcSplitForAllTys, tcSplitFunTys, tcTyConAppArgs,
- )
-
-import BasicTypes ( Boxity(..) )
-import HscTypes ( ForeignStubs(..) )
-import ForeignCall ( ForeignCall(..), CCallSpec(..),
- Safety(..),
- CExportSpec(..), CLabelString,
- CCallConv(..), ccallConvToInt,
- ccallConvAttribute
- )
-import TysWiredIn ( unitTy, tupleTyCon )
-import TysPrim ( addrPrimTy, mkStablePtrPrimTy, alphaTy )
-import PrelNames ( stablePtrTyConName, newStablePtrName, bindIOName,
- checkDotnetResName )
-import BasicTypes ( Activation( NeverActive ) )
-import SrcLoc ( Located(..), unLoc )
+import HsSyn
+import DataCon
+import MachOp
+import SMRep
+import CoreUtils
+import Id
+import Literal
+import Module
+import Name
+import Type
+import Coercion
+import TcType
+
+import HscTypes
+import ForeignCall
+import TysWiredIn
+import TysPrim
+import PrelNames
+import BasicTypes
+import SrcLoc
import Outputable
-import Maybe ( fromJust, isNothing )
import FastString
+
+import Data.Maybe
\end{code}
Desugaring of @foreign@ declarations is naturally split up into
combine stubs (L loc decl) = putSrcSpanDs loc (combine1 stubs decl)
combine1 (ForeignStubs acc_h acc_c acc_hdrs acc_feb, acc_f)
- (ForeignImport id _ spec depr)
+ (ForeignImport id _ spec)
= traceIf (text "fi start" <+> ppr id) `thenDs` \ _ ->
dsFImport (unLoc id) spec `thenDs` \ (bs, h, c, mbhd) ->
- warnDepr depr `thenDs` \ _ ->
traceIf (text "fi end" <+> ppr id) `thenDs` \ _ ->
returnDs (ForeignStubs (h $$ acc_h)
(c $$ acc_c)
bs ++ acc_f)
combine1 (ForeignStubs acc_h acc_c acc_hdrs acc_feb, acc_f)
- (ForeignExport (L _ id) _ (CExport (CExportStatic ext_nm cconv)) depr)
+ (ForeignExport (L _ id) _ (CExport (CExportStatic ext_nm cconv)))
= dsFExport id (idType id)
ext_nm cconv False `thenDs` \(h, c, _, _) ->
- warnDepr depr `thenDs` \_ ->
returnDs (ForeignStubs (h $$ acc_h) (c $$ acc_c) acc_hdrs (id:acc_feb),
acc_f)
addH (Just e) ls
| e `elem` ls = ls
| otherwise = e:ls
-
- warnDepr False = returnDs ()
- warnDepr True = dsWarn msg
- where
- msg = ptext SLIT("foreign declaration uses deprecated non-standard syntax")
\end{code}
f cback =
bindIO (newStablePtr cback)
(\StablePtr sp# -> IO (\s1# ->
- case _ccall_ createAdjustor cconv sp# ``f_helper'' s1# of
+ case _ccall_ createAdjustor cconv sp# ``f_helper'' <arg info> s1# of
(# s2#, a# #) -> (# s2#, A# a# #)))
foreign import "&f_helper" f_helper :: FunPtr (StablePtr Fun -> Fun)
-> DsM ([Binding], SDoc, SDoc)
dsFExportDynamic id cconv
= newSysLocalDs ty `thenDs` \ fe_id ->
- getModuleDs `thenDs` \ mod_name ->
+ getModuleDs `thenDs` \ mod ->
let
-- hack: need to get at the name of the C stub we're about to generate.
- fe_nm = mkFastString (unpackFS (zEncodeFS (moduleFS mod_name)) ++ "_" ++ toCName fe_id)
+ fe_nm = mkFastString (unpackFS (zEncodeFS (moduleNameFS (moduleName mod))) ++ "_" ++ toCName fe_id)
in
newSysLocalDs arg_ty `thenDs` \ cback ->
dsLookupGlobalId newStablePtrName `thenDs` \ newStablePtrId ->
-- PlayRisky: the adjustor doesn't allocate in the Haskell heap or do a callback
let ccall_adj_ty = exprType ccall_adj
ccall_io_adj = mkLams [stbl_value] $
- Note (Coerce io_res_ty ccall_adj_ty)
- ccall_adj
+ (pprTrace "DsForeign: why is there an unsafeCoerce here?" (text "") $
+ (Cast ccall_adj (mkUnsafeCoercion ccall_adj_ty io_res_ty )))
+
io_app = mkLams tvs $
mkLams [cback] $
stbl_app ccall_io_adj res_ty
typeMachRep addrPrimTy)
-- This function returns the primitive type associated with the boxed
--- type argument to a foreign export (eg. Int ==> Int#). It assumes
--- that all the types we are interested in have a single constructor
--- with a single primitive-typed argument, which is true for all of the legal
--- foreign export argument types (see TcType.legalFEArgTyCon).
+-- type argument to a foreign export (eg. Int ==> Int#).
getPrimTyOf :: Type -> Type
-getPrimTyOf ty =
- case splitProductType_maybe (repType ty) of
+getPrimTyOf ty
+ | isBoolTy rep_ty = intPrimTy
+ -- Except for Bool, the types we are interested in have a single constructor
+ -- with a single primitive-typed argument (see TcType.legalFEArgTyCon).
+ | otherwise =
+ case splitProductType_maybe rep_ty of
Just (_, _, data_con, [prim_ty]) ->
ASSERT(dataConSourceArity data_con == 1)
ASSERT2(isUnLiftedType prim_ty, ppr prim_ty)
prim_ty
_other -> pprPanic "DsForeign.getPrimTyOf" (ppr ty)
+ where
+ rep_ty = repType ty
\end{code}
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