module DsCCall ( dsCCall ) where
-import Ubiq
+IMP_Ubiq()
import CoreSyn
import DsUtils
import CoreUtils ( coreExprType )
-import Id ( getInstantiatedDataConSig, mkTupleCon )
+import Id ( dataConArgTys, mkTupleCon )
import Maybes ( maybeToBool )
import PprStyle ( PprStyle(..) )
import PprType ( GenType{-instances-} )
-import PrelInfo ( byteArrayPrimTy, getStatePairingConInfo,
- packStringForCId, realWorldStatePrimTy,
- realWorldStateTy, realWorldTy, stateDataCon,
- stringTy )
import Pretty
+import PrelVals ( packStringForCId )
import PrimOp ( PrimOp(..) )
-import Type ( isPrimType, maybeAppDataTyCon, eqTy )
+import Type ( isPrimType, maybeAppDataTyConExpandingDicts, eqTy, maybeBoxedPrimType )
+import TysPrim ( byteArrayPrimTy, realWorldTy, realWorldStatePrimTy )
+import TysWiredIn ( getStatePairingConInfo,
+ realWorldStateTy, stateDataCon,
+ stringTy
+ )
import Util ( pprPanic, pprError, panic )
-
-maybeBoxedPrimType = panic "DsCCall.maybeBoxedPrimType"
\end{code}
Desugaring of @ccall@s consists of adding some state manipulation,
-- Primitive types
-- ADR Question: can this ever be used? None of the PrimTypes are
- -- instances of the _CCallable class.
+ -- instances of the CCallable class.
| isPrimType arg_ty
= returnDs (arg, \body -> body)
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
+ -- and, of course, it is an instance of CCallable
-- ( tycon == byteArrayTyCon ||
-- tycon == mutableByteArrayTyCon )
= newSysLocalsDs data_con_arg_tys `thenDs` \ vars@[ixs_var, arr_cts_var] ->
\ 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 = Case arg (AlgAlts alts) NoDefault
- in
-
- returnDs (Var prim_arg,
- \ body -> Case arg_tag (PrimAlts [(prim_arg, body)] NoDefault)
- )
-#endif
-\end{code}
-\begin{code}
- -- ... continued from above ....
| otherwise
= pprPanic "unboxArg: " (ppr PprDebug arg_ty)
where
maybe_boxed_prim_arg_ty = maybeBoxedPrimType arg_ty
(Just (box_data_con, the_prim_arg_ty)) = maybe_boxed_prim_arg_ty
- maybe_data_type = maybeAppDataTyCon 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
can't_see_datacons_error thing ty
\prim_app -> Case prim_app (AlgAlts [the_alt] NoDefault)
)
-#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 ->
-
- mkConDs stateDataCon [realWorldTy] [Var prim_state_id] `thenDs` \ new_state ->
-
- let
- alts = [ (mkMachInt i, con) | (i, con) <- [0..] `zip` data_cons ]
- the_result = Case prim_result_id (PrimAlts alts) NoDefault
- in
-
- mkConDs (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 -> Case prim_app (AlgAlts [the_alt] NoDefault)
- )
-#endif
-
| otherwise
= pprPanic "boxResult: " (ppr PprDebug result_ty)
where
- maybe_data_type = maybeAppDataTyCon 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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