%
-% (c) The AQUA Project, Glasgow University, 1994-1995
+% (c) The AQUA Project, Glasgow University, 1994-1996
%
\section[DsCCall]{Desugaring \tr{_ccall_}s and \tr{_casm_}s}
module DsCCall ( dsCCall ) where
-IMPORT_Trace
+IMP_Ubiq()
-import AbsSyn -- the stuff being desugared
-import PlainCore -- the output of desugaring
-import DsMonad -- the monadery used in the desugarer
+import CmdLineOpts (opt_PprUserLength)
+import CoreSyn
-import AbsPrel
-import TysPrim -- ****** ToDo: PROPERLY
-import TysWiredIn
-import AbsUniType
+import DsMonad
import DsUtils
-import Id ( getInstantiatedDataConSig, mkTupleCon, DataCon(..) )
-import Maybes ( maybeToBool, Maybe(..) )
+
+import CoreUtils ( coreExprType )
+import Id ( dataConArgTys )
+import Maybes ( maybeToBool )
+import Outputable ( PprStyle(..), Outputable(..) )
+import PprType ( GenType{-instances-} )
import Pretty
-#if USE_ATTACK_PRAGMAS
-import Unique
-#endif
-import Util
+import PrelVals ( packStringForCId )
+import PrimOp ( PrimOp(..) )
+import Type ( isPrimType, maybeAppDataTyConExpandingDicts, maybeAppTyCon,
+ eqTy, maybeBoxedPrimType, SYN_IE(Type) )
+import TysPrim ( byteArrayPrimTy, realWorldTy, realWorldStatePrimTy,
+ byteArrayPrimTyCon, mutableByteArrayPrimTyCon )
+import TysWiredIn ( getStatePairingConInfo,
+ realWorldStateTy, stateDataCon, pairDataCon, unitDataCon,
+ stringTy
+ )
+import Util ( pprPanic, pprError, panic )
+
\end{code}
Desugaring of @ccall@s consists of adding some state manipulation,
desired.
The state stuff just consists of adding in
-@\ s -> case s of { S# s# -> ... }@ in an appropriate place.
+@PrimIO (\ s -> case s of { S# s# -> ... })@ in an appropriate place.
The unboxing is straightforward, as all information needed to unbox is
available from the type. For each boxed-primitive argument, we
transform:
\begin{verbatim}
- _ccall_ foo [ r, t1, ... tm ] e1 ... em
+ _ccall_ foo [ r, t1, ... tm ] e1 ... em
|
|
V
|
V
\ s# -> case (ccall# foo [ r, t1#, ... tm# ] s# e1# ... em#) of
- (StateAnd<r># result# state#) -> (R# result#, realWorld#)
+ (StateAnd<r># result# state#) -> (R# result#, realWorld#)
\end{verbatim}
\begin{code}
-dsCCall :: FAST_STRING -- C routine to invoke
- -> [PlainCoreExpr] -- Arguments (desugared)
- -> Bool -- True <=> might cause Haskell GC
- -> Bool -- True <=> really a "_casm_"
- -> UniType -- Type of the result (a boxed-prim type)
- -> DsM PlainCoreExpr
+dsCCall :: FAST_STRING -- C routine to invoke
+ -> [CoreExpr] -- Arguments (desugared)
+ -> Bool -- True <=> might cause Haskell GC
+ -> Bool -- True <=> really a "_casm_"
+ -> Type -- Type of the result (a boxed-prim type)
+ -> DsM CoreExpr
dsCCall label args may_gc is_asm result_ty
= newSysLocalDs realWorldStateTy `thenDs` \ old_s ->
- mapAndUnzipDs unboxArg (CoVar old_s : args) `thenDs` \ (final_args, arg_wrappers) ->
+ mapAndUnzipDs unboxArg (Var old_s : args) `thenDs` \ (final_args, arg_wrappers) ->
boxResult result_ty `thenDs` \ (final_result_ty, res_wrapper) ->
let
the_ccall_op = CCallOp label is_asm may_gc
- (map typeOfCoreExpr final_args)
+ (map coreExprType final_args)
final_result_ty
in
- mkCoPrimDs the_ccall_op
- [] -- ***NOTE*** no ty apps; the types are inside the_ccall_op.
- final_args `thenDs` \ the_prim_app ->
+ mkPrimDs the_ccall_op (map VarArg final_args) `thenDs` \ the_prim_app ->
let
- the_body = foldr apply (res_wrapper the_prim_app) arg_wrappers
+ the_body = foldr ($) (res_wrapper the_prim_app) arg_wrappers
in
- returnDs (CoLam [old_s] the_body)
- where
- apply f x = f x
+ returnDs (Lam (ValBinder old_s) the_body)
\end{code}
\begin{code}
-unboxArg :: PlainCoreExpr -- The supplied argument
- -> DsM (PlainCoreExpr, -- To pass as the actual argument
- PlainCoreExpr -> PlainCoreExpr -- Wrapper to unbox the arg
+unboxArg :: CoreExpr -- The supplied argument
+ -> DsM (CoreExpr, -- To pass as the actual argument
+ CoreExpr -> CoreExpr -- Wrapper to unbox the arg
)
unboxArg arg
-- Primitive types
-- ADR Question: can this ever be used? None of the PrimTypes are
- -- instances of the _CCallable class.
- | isPrimType arg_ty
+ -- instances of the CCallable class.
+ --
+ -- SOF response:
+ -- Oh yes they are, I've just added them :-) Having _ccall_ and _casm_
+ -- that accept unboxed arguments is a Good Thing if you have a stub generator
+ -- which generates the boiler-plate box-unbox code for you, i.e., it may help
+ -- us nuke this very module :-)
+ --
+ | isPrimType arg_ty
= returnDs (arg, \body -> body)
-- Strings
- | arg_ty == stringTy
+ | arg_ty `eqTy` stringTy
-- ToDo (ADR): - allow synonyms of Strings too?
= newSysLocalDs byteArrayPrimTy `thenDs` \ prim_arg ->
- mkCoAppDs (CoVar packStringForCId) arg `thenDs` \ pack_appn ->
- returnDs (CoVar prim_arg,
- \body -> CoCase pack_appn (CoPrimAlts []
- (CoBindDefault prim_arg body))
+ mkAppDs (Var packStringForCId) [VarArg arg] `thenDs` \ pack_appn ->
+ returnDs (Var prim_arg,
+ \body -> Case pack_appn (PrimAlts []
+ (BindDefault prim_arg body))
)
| null data_cons
-- oops: we can't see the data constructors!!!
= can't_see_datacons_error "argument" arg_ty
- -- Byte-arrays, both mutable and otherwise
- -- (HACKy method -- but we really don't want the TyCons wired-in...) [WDP 94/10]
- | is_data_type &&
+ -- Byte-arrays, both mutable and otherwise; hack warning
+ | is_data_type &&
length data_con_arg_tys == 2 &&
- not (isPrimType data_con_arg_ty1) &&
- isPrimType data_con_arg_ty2
- -- and, of course, it is an instance of _CCallable
--- ( tycon == byteArrayTyCon ||
--- tycon == mutableByteArrayTyCon )
+ maybeToBool maybe_arg2_tycon &&
+ (arg2_tycon == byteArrayPrimTyCon ||
+ arg2_tycon == mutableByteArrayPrimTyCon)
+ -- and, of course, it is an instance of CCallable
= newSysLocalsDs data_con_arg_tys `thenDs` \ vars@[ixs_var, arr_cts_var] ->
- returnDs (CoVar arr_cts_var,
- \ body -> CoCase arg (CoAlgAlts [(the_data_con,vars,body)]
- CoNoDefault)
+ returnDs (Var arr_cts_var,
+ \ body -> Case arg (AlgAlts [(the_data_con,vars,body)]
+ NoDefault)
)
-- Data types with a single constructor, which has a single, primitive-typed arg
| maybeToBool maybe_boxed_prim_arg_ty
= newSysLocalDs the_prim_arg_ty `thenDs` \ prim_arg ->
- returnDs (CoVar prim_arg,
- \ body -> CoCase arg (CoAlgAlts [(box_data_con,[prim_arg],body)]
- CoNoDefault)
+ returnDs (Var prim_arg,
+ \ body -> Case arg (AlgAlts [(box_data_con,[prim_arg],body)]
+ NoDefault)
)
- -- ... continued below ....
-\end{code}
-
-As an experiment, I'm going to unpack any "acceptably small"
-enumeration. This code will never get used in the main version
-because enumerations would have triggered type errors but I've
-disabled type-checking in my version. ADR
-
-To Will: It might be worth leaving this in (but commented out) until
-we decide what's happening with enumerations. ADR
-
-\begin{code}
-#if 0
- -- MAYBE LATER:
- -- Data types with a nullary constructors (enumeration)
- | isEnumerationType arg_ty && -- enumeration
- (length data_cons) <= 5 -- "acceptably short"
- = newSysLocalDs the_prim_arg_ty `thenDs` \ prim_arg ->
- let
- alts = [ (con, [], mkMachInt i) | (con,i) <- data_cons `zip` [0..] ]
- arg_tag = CoCase arg (CoAlgAlts alts) CoNoDefault
- in
-
- returnDs (CoVar prim_arg,
- \ body -> CoCase arg_tag (CoPrimAlts [(prim_arg, body)] CoNoDefault)
- )
-#endif
-\end{code}
-
-\begin{code}
- -- ... continued from above ....
| otherwise
= pprPanic "unboxArg: " (ppr PprDebug arg_ty)
where
- arg_ty = typeOfCoreExpr arg
+ arg_ty = coreExprType arg
maybe_boxed_prim_arg_ty = maybeBoxedPrimType arg_ty
(Just (box_data_con, the_prim_arg_ty)) = maybe_boxed_prim_arg_ty
- maybe_data_type = getUniDataTyCon_maybe arg_ty
+ maybe_data_type = maybeAppDataTyConExpandingDicts arg_ty
is_data_type = maybeToBool maybe_data_type
(Just (tycon, tycon_arg_tys, data_cons)) = maybe_data_type
(the_data_con : other_data_cons) = data_cons
- (_, data_con_arg_tys, _) = getInstantiatedDataConSig the_data_con tycon_arg_tys
+ data_con_arg_tys = dataConArgTys the_data_con tycon_arg_tys
(data_con_arg_ty1 : data_con_arg_ty2 : _) = data_con_arg_tys
+ maybe_arg2_tycon = maybeAppTyCon data_con_arg_ty2
+ Just (arg2_tycon,_) = maybe_arg2_tycon
+
can't_see_datacons_error thing ty
- = error (ppShow 100 (ppBesides [ppStr "ERROR: Can't see the data constructor(s) for _ccall_/_casm_ ", ppStr thing, ppStr "; type: ", ppr PprForUser ty]))
+ = pprError "ERROR: Can't see the data constructor(s) for _ccall_/_casm_ "
+ (hcat [text thing, text "; type: ", ppr (PprForUser opt_PprUserLength) ty])
\end{code}
\begin{code}
-tuple_con_2 = mkTupleCon 2 -- out here to avoid CAF (sigh)
-covar_tuple_con_0 = CoVar (mkTupleCon 0) -- ditto
-
-boxResult :: UniType -- Type of desired result
- -> DsM (UniType, -- Type of the result of the ccall itself
- PlainCoreExpr -> PlainCoreExpr) -- Wrapper for the ccall
+boxResult :: Type -- Type of desired result
+ -> DsM (Type, -- Type of the result of the ccall itself
+ CoreExpr -> CoreExpr) -- Wrapper for the ccall
-- to box the result
boxResult result_ty
| null data_cons
(null other_data_cons) && -- Just one constr
not (null data_con_arg_tys) && null other_args_tys && -- Just one arg
isPrimType the_prim_result_ty -- of primitive type
- =
- newSysLocalDs realWorldStatePrimTy `thenDs` \ prim_state_id ->
- newSysLocalDs the_prim_result_ty `thenDs` \ prim_result_id ->
-
- mkCoConDs stateDataCon [realWorldTy] [CoVar prim_state_id] `thenDs` \ new_state ->
- mkCoConDs the_data_con tycon_arg_tys [CoVar prim_result_id] `thenDs` \ the_result ->
-
- mkCoConDs tuple_con_2
- [result_ty, realWorldStateTy]
- [the_result, new_state] `thenDs` \ the_pair ->
+ =
+ newSysLocalDs realWorldStatePrimTy `thenDs` \ prim_state_id ->
+ newSysLocalDs the_prim_result_ty `thenDs` \ prim_result_id ->
+
+ mkConDs stateDataCon [TyArg realWorldTy, VarArg (Var prim_state_id)] `thenDs` \ new_state ->
+ mkConDs the_data_con (map TyArg tycon_arg_tys ++ [VarArg (Var prim_result_id)]) `thenDs` \ the_result ->
+
+ mkConDs pairDataCon
+ [TyArg result_ty, TyArg realWorldStateTy, VarArg the_result, VarArg new_state]
+ `thenDs` \ the_pair ->
let
the_alt = (state_and_prim_datacon, [prim_state_id, prim_result_id], the_pair)
in
returnDs (state_and_prim_ty,
- \prim_app -> CoCase prim_app (CoAlgAlts [the_alt] CoNoDefault)
+ \prim_app -> Case prim_app (AlgAlts [the_alt] NoDefault)
)
-- Data types with a single nullary constructor
| (maybeToBool maybe_data_type) && -- Data type
(null other_data_cons) && -- Just one constr
(null data_con_arg_tys)
- =
- newSysLocalDs realWorldStatePrimTy `thenDs` \ prim_state_id ->
+ =
+ newSysLocalDs realWorldStatePrimTy `thenDs` \ prim_state_id ->
- mkCoConDs stateDataCon [realWorldTy] [CoVar prim_state_id] `thenDs` \ new_state ->
-
- mkCoConDs tuple_con_2
- [result_ty, realWorldStateTy]
- [covar_tuple_con_0, new_state] `thenDs` \ the_pair ->
+ mkConDs stateDataCon [TyArg realWorldTy, VarArg (Var prim_state_id)]
+ `thenDs` \ new_state ->
+ mkConDs pairDataCon
+ [TyArg result_ty, TyArg realWorldStateTy, VarArg (Var unitDataCon), VarArg new_state]
+ `thenDs` \ the_pair ->
let
the_alt = (stateDataCon, [prim_state_id], the_pair)
in
returnDs (realWorldStateTy,
- \prim_app -> CoCase prim_app (CoAlgAlts [the_alt] CoNoDefault)
- )
-
-#if 0
- -- MAYBE LATER???
-
- -- Data types with several nullary constructors (Enumerated types)
- | isEnumerationType result_ty && -- Enumeration
- (length data_cons) <= 5 -- fairly short
- =
- newSysLocalDs realWorldStatePrimTy `thenDs` \ prim_state_id ->
- newSysLocalDs intPrimTy `thenDs` \ prim_result_id ->
-
- mkCoConDs stateDataCon [realWorldTy] [CoVar prim_state_id] `thenDs` \ new_state ->
-
- let
- alts = [ (mkMachInt i, con) | (i, con) <- [0..] `zip` data_cons ]
- the_result = CoCase prim_result_id (CoPrimAlts alts) CoNoDefault
- in
-
- mkCoConDs (mkTupleCon 2)
- [result_ty, realWorldStateTy]
- [the_result, new_state] `thenDs` \ the_pair ->
- let
- the_alt = (state_and_prim_datacon, [prim_state_id, prim_result_id], the_pair)
- in
- returnDs (state_and_prim_ty,
- \prim_app -> CoCase prim_app (CoAlgAlts [the_alt] CoNoDefault)
+ \prim_app -> Case prim_app (AlgAlts [the_alt] NoDefault)
)
-#endif
- | otherwise
+ | otherwise
= pprPanic "boxResult: " (ppr PprDebug result_ty)
where
- maybe_data_type = getUniDataTyCon_maybe result_ty
+ maybe_data_type = maybeAppDataTyConExpandingDicts result_ty
Just (tycon, tycon_arg_tys, data_cons) = maybe_data_type
(the_data_con : other_data_cons) = data_cons
- (_, data_con_arg_tys, _) = getInstantiatedDataConSig the_data_con tycon_arg_tys
+ data_con_arg_tys = dataConArgTys the_data_con tycon_arg_tys
(the_prim_result_ty : other_args_tys) = data_con_arg_tys
(state_and_prim_datacon, state_and_prim_ty) = getStatePairingConInfo the_prim_result_ty
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