import CoreSyn
-import DsCCall ( dsCCall, boxResult, unboxArg, wrapUnboxedValue )
+import DsCCall ( dsCCall, mkCCall, boxResult, unboxArg, wrapUnboxedValue )
import DsMonad
import DsUtils
-import HsSyn ( ExtName(..), ForeignDecl(..), isDynamic, ForKind(..) )
+import HsSyn ( ExtName(..), ForeignDecl(..), isDynamicExtName, ForKind(..) )
+import HsDecls ( extNameStatic )
import CallConv
import TcHsSyn ( TypecheckedForeignDecl )
-import CoreUtils ( coreExprType )
-import Const ( Con(..), mkMachInt )
-import DataCon ( DataCon, dataConId )
+import CoreUtils ( exprType, mkInlineMe )
+import DataCon ( DataCon, dataConWrapId )
import Id ( Id, idType, idName, mkWildId, mkVanillaId )
-import Const ( Literal(..) )
+import MkId ( mkCCallOpId, mkWorkerId )
+import Literal ( Literal(..) )
import Module ( Module, moduleUserString )
import Name ( mkGlobalName, nameModule, nameOccName, getOccString,
mkForeignExportOcc, isLocalName,
Type, mkFunTys, mkForAllTys, mkTyConApp,
mkTyVarTy, mkFunTy, splitAppTy
)
-import PrimOp ( PrimOp(..) )
+import PrimOp ( PrimOp(..), CCall(..), CCallTarget(..) )
import Var ( TyVar )
import TysPrim ( realWorldStatePrimTy, addrPrimTy )
import TysWiredIn ( unitTyCon, addrTy, stablePtrTyCon,
unboxedTupleCon, addrDataCon
)
import Unique
+import Maybes ( maybeToBool )
import Outputable
#if __GLASGOW_HASKELL__ >= 404
where
combine (acc_fi, acc_fe, acc_h, acc_c) fo@(ForeignDecl i imp_exp _ ext_nm cconv _)
| isForeignImport = -- foreign import (dynamic)?
- dsFImport i (idType i) uns ext_nm cconv `thenDs` \ b ->
- returnDs (b:acc_fi, acc_fe, acc_h, acc_c)
+ dsFImport i (idType i) uns ext_nm cconv `thenDs` \ bs ->
+ returnDs (bs ++ acc_fi, acc_fe, acc_h, acc_c)
| isForeignLabel =
dsFLabel i ext_nm `thenDs` \ b ->
returnDs (b:acc_fi, acc_fe, acc_h, acc_c)
- | isDynamic ext_nm =
+ | isDynamicExtName ext_nm =
dsFExportDynamic i (idType i) mod_name ext_nm cconv `thenDs` \ (fi,fe,h,c) ->
returnDs (fi:acc_fi, fe:acc_fe, h $$ acc_h, c $$ acc_c)
that on its RHS unboxes its arguments, performs the external call
(using the @CCallOp@ primop), before boxing the result up and returning it.
+However, we create a worker/wrapper pair, thus:
+
+ foreign import f :: Int -> IO Int
+==>
+ f x = IO ( \s -> case x of { I# x# ->
+ case fw s x# of { (# s1, y# #) ->
+ (# s1, I# y# #)}})
+
+ fw s x# = ccall f s x#
+
+The strictness/CPR analyser won't do this automatically because it doesn't look
+inside returned tuples; but inlining this wrapper is a Really Good Idea
+because it exposes the boxing to the call site.
+
+
\begin{code}
dsFImport :: Id
-> Type -- Type of foreign import.
-> Bool -- True <=> might cause Haskell GC
-> ExtName
-> CallConv
- -> DsM CoreBind
-dsFImport nm ty may_not_gc ext_name cconv =
- newSysLocalDs realWorldStatePrimTy `thenDs` \ old_s ->
- splitForeignTyDs ty `thenDs` \ (tvs, args, mbIoDataCon, io_res_ty) ->
- let
- the_state_arg
- | is_io_action = old_s
- | otherwise = realWorldPrimId
-
- arg_exprs = map (Var) args
-
- is_io_action =
- case mbIoDataCon of
- Nothing -> False
- _ -> True
+ -> DsM [CoreBind]
+dsFImport fn_id ty may_not_gc ext_name cconv
+ = let
+ (tvs, arg_tys, mbIoDataCon, io_res_ty) = splitForeignTyDs ty
+ is_io_action = maybeToBool mbIoDataCon
in
- mapAndUnzipDs unboxArg arg_exprs `thenDs` \ (unboxed_args, arg_wrappers) ->
+ newSysLocalsDs arg_tys `thenDs` \ args ->
+ newSysLocalDs realWorldStatePrimTy `thenDs` \ old_s ->
+ mapAndUnzipDs unboxArg (map Var args) `thenDs` \ (unboxed_args, arg_wrappers) ->
+
(if not is_io_action then
- newSysLocalDs realWorldStatePrimTy `thenDs` \ state_tok ->
- wrapUnboxedValue io_res_ty `thenDs` \ (ccall_result_ty, v, res_v) ->
+ newSysLocalDs realWorldStatePrimTy `thenDs` \ state_tok ->
+ wrapUnboxedValue io_res_ty `thenDs` \ (ccall_result_ty, v, res_v) ->
returnDs ( ccall_result_ty
, \ prim_app -> Case prim_app (mkWildId ccall_result_ty)
- [(DataCon (unboxedTupleCon 2), [state_tok, v], res_v)])
+ [(DataAlt (unboxedTupleCon 2), [state_tok, v], res_v)])
else
- boxResult io_res_ty) `thenDs` \ (final_result_ty, res_wrapper) ->
+ boxResult io_res_ty) `thenDs` \ (ccall_result_ty, res_wrapper) ->
+
(case ext_name of
Dynamic -> getUniqueDs `thenDs` \ u ->
- returnDs (Right u)
- ExtName fs _ -> returnDs (Left fs)) `thenDs` \ lbl ->
- let
- val_args = Var the_state_arg : unboxed_args
- final_args = Type inst_ty : val_args
-
- -- A CCallOp has type (forall a. a), so we must instantiate
- -- it at the full type, including the state argument
- inst_ty = mkFunTys (map coreExprType val_args) final_result_ty
-
- the_ccall_op = CCallOp lbl False (not may_not_gc) cconv
-
- the_prim_app = mkPrimApp the_ccall_op (final_args :: [CoreArg])
-
- body = foldr ($) (res_wrapper the_prim_app) arg_wrappers
+ returnDs (DynamicTarget u)
+ ExtName fs _ -> returnDs (StaticTarget fs)) `thenDs` \ lbl ->
- the_body
- | not is_io_action = body
- | otherwise = Lam old_s body
- in
- newSysLocalDs (coreExprType the_body) `thenDs` \ ds ->
+ getUniqueDs `thenDs` \ ccall_uniq ->
+ getUniqueDs `thenDs` \ work_uniq ->
let
- io_app =
- case mbIoDataCon of
- Nothing -> Var ds
- Just ioDataCon ->
- mkApps (Var (dataConId ioDataCon))
- [Type io_res_ty, Var ds]
-
- fo_rhs = mkLams (tvs ++ args)
- (mkDsLet (NonRec ds (the_body::CoreExpr)) io_app)
+ the_state_arg | is_io_action = old_s
+ | otherwise = realWorldPrimId
+
+ -- Build the worker
+ val_args = Var the_state_arg : unboxed_args
+ work_arg_ids = [v | Var v <- val_args] -- All guaranteed to be vars
+ worker_ty = mkForAllTys tvs (mkFunTys (map idType work_arg_ids) ccall_result_ty)
+ the_ccall = CCall lbl False (not may_not_gc) cconv
+ the_ccall_app = mkCCall ccall_uniq the_ccall val_args ccall_result_ty
+ work_rhs = mkLams tvs (mkLams work_arg_ids the_ccall_app)
+ work_id = mkWorkerId work_uniq fn_id worker_ty
+
+ -- Build the wrapper
+ work_app = mkApps (mkVarApps (Var work_id) tvs) val_args
+ wrapper_body = foldr ($) (res_wrapper work_app) arg_wrappers
+ io_app = case mbIoDataCon of
+ Nothing -> wrapper_body
+ Just ioDataCon -> mkApps (Var (dataConWrapId ioDataCon))
+ [Type io_res_ty, Lam old_s wrapper_body]
+ wrap_rhs = mkInlineMe (mkLams (tvs ++ args) io_app)
in
- returnDs (NonRec nm fo_rhs)
+ returnDs [NonRec fn_id wrap_rhs, NonRec work_id work_rhs]
\end{code}
Given the type of a foreign import declaration, split it up into
its constituent parts.
\begin{code}
-splitForeignTyDs :: Type -> DsM ([TyVar], [Id], Maybe DataCon, Type)
-splitForeignTyDs ty =
- newSysLocalsDs arg_tys `thenDs` \ ds_args ->
- case splitAlgTyConApp_maybe res_ty of
+splitForeignTyDs :: Type -> ([TyVar], [Type], Maybe DataCon, Type)
+splitForeignTyDs ty
+ = case splitAlgTyConApp_maybe res_ty of
Just (_,(io_res_ty:_),(ioCon:_)) -> -- .... -> IO t
- returnDs (tvs, ds_args, Just ioCon, io_res_ty)
+ (tvs, arg_tys, Just ioCon, io_res_ty)
_ -> -- .... -> t
- returnDs (tvs, ds_args, Nothing, res_ty)
+ (tvs, arg_tys, Nothing, res_ty)
where
(arg_tys, res_ty) = splitFunTys sans_foralls
(tvs, sans_foralls) = splitForAllTys ty
-
\end{code}
foreign labels
dsFLabel nm ext_name = returnDs (NonRec nm fo_rhs)
where
fo_rhs = mkConApp addrDataCon [mkLit (MachLitLit enm addrPrimTy)]
- enm =
- case ext_name of
- ExtName f _ -> f
- Dynamic -> panic "dsFLabel: Dynamic - shouldn't ever happen."
-
+ enm = extNameStatic ext_name
\end{code}
The function that does most of the work for `@foreign export@' declarations.
the_deref_app = mkApps (Var deRefStablePtrId)
[ Type stbl_ptr_to_ty, Var stbl_ptr ]
in
- newSysLocalDs (coreExprType the_deref_app) `thenDs` \ x_deref_app ->
+ newSysLocalDs (exprType the_deref_app) `thenDs` \ x_deref_app ->
dsLookupGlobalValue bindIO_NAME `thenDs` \ bindIOId ->
newSysLocalDs (mkFunTy stbl_ptr_to_ty
(mkTyConApp ioTyCon [res_ty])) `thenDs` \ x_cont ->
getUniqueDs `thenDs` \ uniq ->
let
the_body = mkLams (tvs ++ wrapper_args) the_app
-
- c_nm =
- case ext_name of
- ExtName fs _ -> fs
- Dynamic -> panic "dsFExport: Dynamic - shouldn't ever happen."
+ c_nm = extNameStatic ext_name
(h_stub, c_stub) = fexportEntry (moduleUserString mod)
c_nm f_helper_glob
dsLookupGlobalValue makeStablePtr_NAME `thenDs` \ makeStablePtrId ->
let
mk_stbl_ptr_app = mkApps (Var makeStablePtrId) [ Type arg_ty, Var cback ]
- mk_stbl_ptr_app_ty = coreExprType mk_stbl_ptr_app
+ mk_stbl_ptr_app_ty = exprType mk_stbl_ptr_app
in
newSysLocalDs mk_stbl_ptr_app_ty `thenDs` \ x_mk_stbl_ptr_app ->
dsLookupGlobalValue bindIO_NAME `thenDs` \ bindIOId ->
to be entered using an external calling convention
(stdcall, ccall).
-}
- adj_args = [ mkLit (mkMachInt (fromInt (callConvToInt cconv)))
+ adj_args = [ mkIntLitInt (callConvToInt cconv)
, Var stbl_value
, mkLit (MachLitLit (_PK_ fe_nm) addrPrimTy)
]
adjustor = SLIT("createAdjustor")
in
dsCCall adjustor adj_args False False addrTy `thenDs` \ ccall_adj ->
- let ccall_adj_ty = coreExprType ccall_adj
+ let ccall_adj_ty = exprType ccall_adj
in
newSysLocalDs ccall_adj_ty `thenDs` \ x_ccall_adj ->
let ccall_io_adj =
Note (Coerce (mkTyConApp ioTyCon [res_ty]) (unUsgTy ccall_adj_ty))
(Var x_ccall_adj)
in
- newSysLocalDs (coreExprType ccall_io_adj) `thenDs` \ x_ccall_io_adj ->
+ newSysLocalDs (exprType ccall_io_adj) `thenDs` \ x_ccall_io_adj ->
let io_app = mkLams tvs $
mkLams [cback] $
stbl_app x_ccall_io_adj ccall_io_adj addrTy
projects / ghc-hetmet.git / blobdiff