import CoreUtils ( exprType, mkInlineMe )
import Id ( Id, idType, idName, mkSysLocal, setInlinePragma )
import Literal ( Literal(..), mkStringLit )
-import Module ( moduleFS )
+import Module ( moduleNameFS, moduleName )
import Name ( getOccString, NamedThing(..) )
import Type ( repType, coreEqType )
import TcType ( Type, mkFunTys, mkForAllTys, mkTyConApp,
mkFunTy, tcSplitTyConApp_maybe, tcSplitIOType_maybe,
tcSplitForAllTys, tcSplitFunTys, tcTyConAppArgs,
+ isBoolTy
)
import BasicTypes ( Boxity(..) )
ccallConvAttribute
)
import TysWiredIn ( unitTy, tupleTyCon )
-import TysPrim ( addrPrimTy, mkStablePtrPrimTy, alphaTy )
+import TysPrim ( addrPrimTy, mkStablePtrPrimTy, alphaTy, intPrimTy )
import PrelNames ( stablePtrTyConName, newStablePtrName, bindIOName,
checkDotnetResName )
import BasicTypes ( Activation( NeverActive ) )
fe_arg_tys res_ty is_IO_res_ty cconv
\end{code}
-@foreign export dynamic@ lets you dress up Haskell IO actions
-of some fixed type behind an externally callable interface (i.e.,
-as a C function pointer). Useful for callbacks and stuff.
+@foreign import "wrapper"@ (previously "foreign export dynamic") lets
+you dress up Haskell IO actions of some fixed type behind an
+externally callable interface (i.e., as a C function pointer). Useful
+for callbacks and stuff.
\begin{verbatim}
-foreign export dynamic f :: (Addr -> Int -> IO Int) -> IO Addr
+type Fun = Bool -> Int -> IO Int
+foreign import "wrapper" f :: Fun -> IO (FunPtr Fun)
-- Haskell-visible constructor, which is generated from the above:
-- SUP: No check for NULL from createAdjustor anymore???
-f :: (Addr -> Int -> IO Int) -> IO Addr
+f :: Fun -> IO (FunPtr Fun)
f cback =
bindIO (newStablePtr cback)
(\StablePtr sp# -> IO (\s1# ->
case _ccall_ createAdjustor cconv sp# ``f_helper'' s1# of
(# s2#, a# #) -> (# s2#, A# a# #)))
-foreign export "f_helper" f_helper :: StablePtr (Addr -> Int -> IO Int) -> Addr -> Int -> IO Int
--- `special' foreign export that invokes the closure pointed to by the
--- first argument.
+foreign import "&f_helper" f_helper :: FunPtr (StablePtr Fun -> Fun)
+
+-- and the helper in C:
+
+f_helper(StablePtr s, HsBool b, HsInt i)
+{
+ rts_evalIO(rts_apply(rts_apply(deRefStablePtr(s),
+ rts_mkBool(b)), rts_mkInt(i)));
+}
\end{verbatim}
\begin{code}
-> 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 ->
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}