\section[DsExpr]{Matching expressions (Exprs)}
\begin{code}
-#include "HsVersions.h"
-
module DsExpr ( dsExpr ) where
-IMP_Ubiq()
-#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ <= 201
-IMPORT_DELOOPER(DsLoop) -- partly to get dsBinds, partly to chk dsExpr
-#else
+#include "HsVersions.h"
+
import {-# SOURCE #-} DsBinds (dsBinds )
-#endif
import HsSyn ( failureFreePat,
HsExpr(..), OutPat(..), HsLit(..), ArithSeqInfo(..),
Stmt(..), DoOrListComp(..), Match(..), HsBinds, HsType, Fixity,
GRHSsAndBinds
)
-import TcHsSyn ( SYN_IE(TypecheckedHsExpr), SYN_IE(TypecheckedHsBinds),
- SYN_IE(TypecheckedRecordBinds), SYN_IE(TypecheckedPat),
- SYN_IE(TypecheckedStmt)
+import TcHsSyn ( TypecheckedHsExpr, TypecheckedHsBinds,
+ TypecheckedRecordBinds, TypecheckedPat,
+ TypecheckedStmt,
+ maybeBoxedPrimType
+
)
import CoreSyn
import DsMonad
import DsCCall ( dsCCall )
-import DsHsSyn ( outPatType )
import DsListComp ( dsListComp )
-import DsUtils ( mkAppDs, mkConDs, mkPrimDs, dsExprToAtomGivenTy, mkTupleExpr,
- mkErrorAppDs, showForErr, EquationInfo,
- MatchResult, SYN_IE(DsCoreArg)
+import DsUtils ( mkAppDs, mkConDs, dsExprToAtomGivenTy,
+ mkErrorAppDs, showForErr, DsCoreArg
)
import Match ( matchWrapper )
-import CoreUtils ( coreExprType, substCoreExpr, argToExpr,
- mkCoreIfThenElse, unTagBinders )
+import CoreUtils ( coreExprType, mkCoreIfThenElse )
import CostCentre ( mkUserCC )
-import FieldLabel ( fieldLabelType, FieldLabel )
-import Id ( idType, nullIdEnv, addOneToIdEnv,
- dataConArgTys, dataConFieldLabels,
- recordSelectorFieldLabel, SYN_IE(Id)
+import FieldLabel ( FieldLabel )
+import Id ( dataConTyCon, dataConArgTys, dataConFieldLabels,
+ recordSelectorFieldLabel, Id
)
import Literal ( mkMachInt, Literal(..) )
import Name ( Name{--O only-} )
-import Outputable ( PprStyle(..), Outputable(..) )
-import PprType ( GenType )
-import PrelVals ( rEC_CON_ERROR_ID, rEC_UPD_ERROR_ID, voidId )
-import Pretty ( Doc, hcat, ptext, text )
-import Type ( splitSigmaTy, splitFunTy, typePrimRep,
- getAppDataTyConExpandingDicts, maybeAppTyCon, getAppTyCon, applyTy,
- maybeBoxedPrimType, splitAppTy, SYN_IE(Type)
+import PrelVals ( rEC_CON_ERROR_ID, rEC_UPD_ERROR_ID )
+import TyCon ( isNewTyCon )
+import Type ( splitFunTys, typePrimRep, mkTyConApp,
+ splitAlgTyConApp, splitTyConApp_maybe,
+ splitAppTy, Type
)
-import TysPrim ( voidTy )
-import TysWiredIn ( mkTupleTy, tupleCon, nilDataCon, consDataCon, listTyCon, mkListTy,
+import TysWiredIn ( tupleCon, nilDataCon, consDataCon, listTyCon, mkListTy,
charDataCon, charTy
)
-import TyVar ( nullTyVarEnv, addOneToTyVarEnv, GenTyVar{-instance Eq-} )
-import Usage ( SYN_IE(UVar) )
+import TyVar ( GenTyVar{-instance Eq-} )
import Maybes ( maybeToBool )
-import Util ( zipEqual, pprError, panic, assertPanic )
+import Util ( zipEqual )
+import Outputable
-mk_nil_con ty = mkCon nilDataCon [] [ty] [] -- micro utility...
+mk_nil_con ty = mkCon nilDataCon [ty] [] -- micro utility...
\end{code}
The funny business to do with variables is that we look them up in the
| _LENGTH_ s == 1
= let
- the_char = mkCon charDataCon [] [] [LitArg (MachChar (_HEAD_ s))]
+ the_char = mkCon charDataCon [] [LitArg (MachChar (_HEAD_ s))]
the_nil = mk_nil_con charTy
in
mkConDs consDataCon [TyArg charTy, VarArg the_char, VarArg the_nil]
= returnDs (Lit (NoRepStr str))
dsExpr (HsLitOut (HsLitLit s) ty)
- = returnDs ( mkCon data_con [] [] [LitArg (MachLitLit s kind)] )
+ = returnDs ( mkCon data_con [] [LitArg (MachLitLit s kind)] )
where
(data_con, kind)
= case (maybeBoxedPrimType ty) of
Just (boxing_data_con, prim_ty)
-> (boxing_data_con, typePrimRep prim_ty)
Nothing
- -> pprError "ERROR: ``literal-literal'' not a single-constructor type: "
- (hcat [ptext s, text "; type: ", ppr PprDebug ty])
+ -> pprPanic "ERROR: ``literal-literal'' not a single-constructor type: "
+ (hcat [ptext s, text "; type: ", ppr ty])
dsExpr (HsLitOut (HsInt i) ty)
= returnDs (Lit (NoRepInteger i ty))
-- ToDo: range checking needed!
dsExpr (HsLitOut (HsChar c) _)
- = returnDs ( mkCon charDataCon [] [] [LitArg (MachChar c)] )
+ = returnDs ( mkCon charDataCon [] [LitArg (MachChar c)] )
dsExpr (HsLitOut (HsCharPrim c) _)
= returnDs (Lit (MachChar c))
= dsExpr op `thenDs` \ core_op ->
-- for the type of y, we need the type of op's 2nd argument
let
- (x_ty:y_ty:_, _) = splitFunTy (coreExprType core_op)
+ (x_ty:y_ty:_, _) = splitFunTys (coreExprType core_op)
in
dsExpr e1 `thenDs` \ x_core ->
dsExpr e2 `thenDs` \ y_core ->
= dsExpr op `thenDs` \ core_op ->
-- for the type of y, we need the type of op's 2nd argument
let
- (x_ty:y_ty:_, _) = splitFunTy (coreExprType core_op)
+ (x_ty:y_ty:_, _) = splitFunTys (coreExprType core_op)
in
dsExpr expr `thenDs` \ x_core ->
dsExprToAtomGivenTy x_core x_ty $ \ x_atom ->
= dsExpr op `thenDs` \ core_op ->
-- for the type of x, we need the type of op's 2nd argument
let
- (x_ty:y_ty:_, _) = splitFunTy (coreExprType core_op)
+ (x_ty:y_ty:_, _) = splitFunTys (coreExprType core_op)
in
dsExpr expr `thenDs` \ y_expr ->
dsExprToAtomGivenTy y_expr y_ty $ \ y_atom ->
dsExpr (HsSCC cc expr)
= dsExpr expr `thenDs` \ core_expr ->
getModuleAndGroupDs `thenDs` \ (mod_name, group_name) ->
- returnDs ( SCC (mkUserCC cc mod_name group_name) core_expr)
+ returnDs (Note (SCC (mkUserCC cc mod_name group_name)) core_expr)
dsExpr expr@(HsCase discrim matches src_loc)
= putSrcLocDs src_loc $
dsDo do_or_lc stmts return_id then_id zero_id result_ty
where
maybe_list_comp
- = case (do_or_lc, maybeAppTyCon result_ty) of
+ = case (do_or_lc, splitTyConApp_maybe result_ty) of
(ListComp, Just (tycon, [elt_ty]))
| tycon == listTyCon
-> Just elt_ty
mkConDs (tupleCon (length expr_list))
(map (TyArg . coreExprType) core_exprs ++ map VarArg core_exprs)
+dsExpr (HsCon con_id [ty] [arg])
+ | isNewTyCon tycon
+ = dsExpr arg `thenDs` \ arg' ->
+ returnDs (Note (Coerce result_ty (coreExprType arg')) arg')
+ where
+ result_ty = mkTyConApp tycon [ty]
+ tycon = dataConTyCon con_id
+
+dsExpr (HsCon con_id tys args)
+ = mapDs dsExpr args `thenDs` \ args2 ->
+ mkConDs con_id (map TyArg tys ++ map VarArg args2)
+
dsExpr (ArithSeqOut expr (From from))
= dsExpr expr `thenDs` \ expr2 ->
dsExpr from `thenDs` \ from2 ->
\begin{code}
-dsExpr (RecordCon con_expr rbinds)
+dsExpr (RecordCon con_id con_expr rbinds)
= dsExpr con_expr `thenDs` \ con_expr' ->
let
- con_id = get_con con_expr'
- (arg_tys, _) = splitFunTy (coreExprType con_expr')
+ (arg_tys, _) = splitFunTys (coreExprType con_expr')
mk_arg (arg_ty, lbl)
= case [rhs | (sel_id,rhs,_) <- rbinds,
in
mapDs mk_arg (zipEqual "dsExpr:RecordCon" arg_tys (dataConFieldLabels con_id)) `thenDs` \ con_args ->
mkAppDs con_expr' (map VarArg con_args)
- where
- -- "con_expr'" is simply an application of the constructor Id
- -- to types and (perhaps) dictionaries. This gets the constructor...
- get_con (Var con) = con
- get_con (App fun _) = get_con fun
\end{code}
Record update is a little harder. Suppose we have the decl:
dsRbinds rbinds $ \ rbinds' ->
let
record_in_ty = coreExprType record_expr'
- (tycon, in_inst_tys, cons) = getAppDataTyConExpandingDicts record_in_ty
- (_, out_inst_tys, _) = getAppDataTyConExpandingDicts record_out_ty
+ (tycon, in_inst_tys, cons) = splitAlgTyConApp record_in_ty
+ (_, out_inst_tys, _) = splitAlgTyConApp record_out_ty
cons_to_upd = filter has_all_fields cons
-- initial_args are passed to every constructor
returnDs (foldl (\f d -> f `App` (VarArg d)) core_expr core_dicts)
\end{code}
-@SingleDicts@ become @Locals@; @Dicts@ turn into tuples, unless
-of length 0 or 1.
-@ClassDictLam dictvars methods expr@ is ``the opposite'':
-\begin{verbatim}
-\ x -> case x of ( dictvars-and-methods-tuple ) -> expr
-\end{verbatim}
\begin{code}
-dsExpr (SingleDict dict) -- just a local
- = lookupEnvDs dict `thenDs` \ dict' ->
- returnDs (Var dict')
-
-dsExpr (Dictionary [] []) -- Empty dictionary represented by void,
- = returnDs (Var voidId) -- (not, as would happen if we took the next case, by ())
-dsExpr (Dictionary dicts methods)
- = mapDs lookupEnvDs (dicts ++ methods) `thenDs` \ d_and_ms' ->
- returnDs (mkTupleExpr d_and_ms')
-
-dsExpr (ClassDictLam dicts methods expr)
- = dsExpr expr `thenDs` \ core_expr ->
- case num_of_d_and_ms of
- 0 -> newSysLocalDs voidTy `thenDs` \ new_x ->
- returnDs (mkValLam [new_x] core_expr)
-
- 1 -> -- no untupling
- returnDs (mkValLam dicts_and_methods core_expr)
-
- _ -> -- untuple it
- newSysLocalDs tuple_ty `thenDs` \ new_x ->
- returnDs (
- Lam (ValBinder new_x)
- (Case (Var new_x)
- (AlgAlts
- [(tuple_con, dicts_and_methods, core_expr)]
- NoDefault)))
- where
- num_of_d_and_ms = length dicts + length methods
- dicts_and_methods = dicts ++ methods
- tuple_ty = mkTupleTy num_of_d_and_ms (map idType dicts_and_methods)
- tuple_con = tupleCon num_of_d_and_ms
#ifdef DEBUG
-- HsSyn constructs that just shouldn't be here:
continue_with ((sel_id, rhs_atom) : rbinds')
\end{code}
-\begin{code}
--- do_unfold ty_env val_env (Lam (TyBinder tyvar) body) (TyArg ty : args)
--- = do_unfold (addOneToTyVarEnv ty_env tyvar ty) val_env body args
---
--- do_unfold ty_env val_env (Lam (ValBinder binder) body) (arg@(VarArg expr) : args)
--- = dsExprToAtom arg $ \ arg_atom ->
--- do_unfold ty_env
--- (addOneToIdEnv val_env binder (argToExpr arg_atom))
--- body args
---
--- do_unfold ty_env val_env body args
--- = -- Clone the remaining part of the template
--- uniqSMtoDsM (substCoreExpr val_env ty_env body) `thenDs` \ body' ->
---
--- -- Apply result to remaining arguments
--- mkAppDs body' args
-\end{code}
-
Basically does the translation given in the Haskell~1.3 report:
\begin{code}
dsDo :: DoOrListComp
projects / ghc-hetmet.git / blobdiff