#include "HsVersions.h"
import HsSyn ( HsExpr(..), HsLit(..), ArithSeqInfo(..),
- HsBinds(..), Stmt(..), StmtCtxt(..),
- mkMonoBind
+ HsBinds(..), MonoBinds(..), Stmt(..), StmtCtxt(..),
+ mkMonoBind, nullMonoBinds
)
import RnHsSyn ( RenamedHsExpr, RenamedRecordBinds )
-import TcHsSyn ( TcExpr, TcRecordBinds,
- mkHsTyApp, mkHsLet, maybeBoxedPrimType
+import TcHsSyn ( TcExpr, TcRecordBinds, mkHsConApp,
+ mkHsTyApp, mkHsLet
)
import TcMonad
import BasicTypes ( RecFlag(..) )
import Inst ( Inst, InstOrigin(..), OverloadedLit(..),
- LIE, emptyLIE, unitLIE, plusLIE, plusLIEs, newOverloadedLit,
- newMethod, instOverloadedFun, newDicts )
+ LIE, emptyLIE, unitLIE, consLIE, plusLIE, plusLIEs,
+ lieToList, listToLIE,
+ newOverloadedLit, newMethod, newIPDict,
+ instOverloadedFun, newDicts, newClassDicts,
+ getIPsOfLIE, instToId, ipToId
+ )
import TcBinds ( tcBindsAndThen )
import TcEnv ( tcInstId,
tcLookupValue, tcLookupClassByKey,
tcLookupTyCon, tcLookupDataCon
)
import TcMatches ( tcMatchesCase, tcMatchLambda, tcStmts )
-import TcMonoType ( tcHsType, checkSigTyVars, sigCtxt )
+import TcMonoType ( tcHsSigType, checkSigTyVars, sigCtxt )
import TcPat ( badFieldCon )
-import TcSimplify ( tcSimplifyAndCheck )
+import TcSimplify ( tcSimplify, tcSimplifyAndCheck, partitionPredsOfLIE )
import TcType ( TcType, TcTauType,
tcInstTyVars,
tcInstTcType, tcSplitRhoTy,
)
import Id ( idType, recordSelectorFieldLabel,
isRecordSelector,
- Id
+ Id, mkVanillaId
)
-import DataCon ( dataConFieldLabels, dataConSig, dataConId,
+import DataCon ( dataConFieldLabels, dataConSig,
dataConStrictMarks, StrictnessMark(..)
)
-import Name ( Name )
+import Name ( Name, getName )
import Type ( mkFunTy, mkAppTy, mkTyVarTy, mkTyVarTys,
+ ipName_maybe,
splitFunTy_maybe, splitFunTys, isNotUsgTy,
mkTyConApp,
splitForAllTys, splitRhoTy,
boxedTypeKind, mkArrowKind,
tidyOpenType
)
-import Subst ( mkTopTyVarSubst, substTheta )
+import Subst ( mkTopTyVarSubst, substClasses )
import UsageSPUtils ( unannotTy )
-import VarSet ( elemVarSet, mkVarSet )
+import VarSet ( emptyVarSet, unionVarSet, elemVarSet, mkVarSet )
import TyCon ( tyConDataCons )
import TysPrim ( intPrimTy, charPrimTy, doublePrimTy,
floatPrimTy, addrPrimTy
tcInstTcType expected_arg_ty `thenNF_Tc` \ (sig_tyvars, sig_rho) ->
let
(sig_theta, sig_tau) = splitRhoTy sig_rho
+ free_tyvars = tyVarsOfType expected_arg_ty
in
-- Type-check the arg and unify with expected type
tcMonoExpr arg sig_tau `thenTc` \ (arg', lie_arg) ->
-- Conclusion: include the free vars of the expected arg type in the
-- list of "free vars" for the signature check.
- tcExtendGlobalTyVars (tyVarsOfType expected_arg_ty) $
- tcAddErrCtxtM (sigCtxt sig_msg expected_arg_ty) $
+ tcExtendGlobalTyVars free_tyvars $
+ tcAddErrCtxtM (sigCtxt sig_msg sig_tyvars sig_theta sig_tau) $
- checkSigTyVars sig_tyvars `thenTc` \ zonked_sig_tyvars ->
+ checkSigTyVars sig_tyvars free_tyvars `thenTc` \ zonked_sig_tyvars ->
newDicts SignatureOrigin sig_theta `thenNF_Tc` \ (sig_dicts, dict_ids) ->
-- ToDo: better origin
returnTc ( generalised_arg, free_insts,
arg', sig_tau, lie_arg )
where
- sig_msg ty = sep [ptext SLIT("In an expression with expected type:"),
- nest 4 (ppr ty)]
+ sig_msg = ptext SLIT("When checking an expression type signature")
\end{code}
%************************************************************************
\begin{code}
tcMonoExpr :: RenamedHsExpr -- Expession to type check
- -> TcTauType -- Expected type (could be a type variable)
+ -> TcTauType -- Expected type (could be a type variable)
-> TcM s (TcExpr, LIE)
tcMonoExpr (HsVar name) res_ty
returnTc (expr', lie)
\end{code}
+\begin{code}
+tcMonoExpr (HsIPVar name) res_ty
+ -- ZZ What's the `id' used for here...
+ = let id = mkVanillaId name res_ty in
+ tcGetInstLoc (OccurrenceOf id) `thenNF_Tc` \ loc ->
+ newIPDict name res_ty loc `thenNF_Tc` \ ip ->
+ returnNF_Tc (HsIPVar (instToId ip), unitLIE ip)
+\end{code}
+
%************************************************************************
%* *
\subsection{Literals}
tcMonoExpr (HsLit lit@(HsLitLit s)) res_ty
= tcLookupClassByKey cCallableClassKey `thenNF_Tc` \ cCallableClass ->
- newDicts (LitLitOrigin (_UNPK_ s))
- [(cCallableClass, [res_ty])] `thenNF_Tc` \ (dicts, _) ->
+ newClassDicts (LitLitOrigin (_UNPK_ s))
+ [(cCallableClass,[res_ty])] `thenNF_Tc` \ (dicts, _) ->
returnTc (HsLitOut lit res_ty, dicts)
\end{code}
later use.
\begin{code}
-tcMonoExpr (CCall lbl args may_gc is_asm ignored_fake_result_ty) res_ty
+tcMonoExpr (HsCCall lbl args may_gc is_asm ignored_fake_result_ty) res_ty
= -- Get the callable and returnable classes.
tcLookupClassByKey cCallableClassKey `thenNF_Tc` \ cCallableClass ->
tcLookupClassByKey cReturnableClassKey `thenNF_Tc` \ cReturnableClass ->
tcLookupTyCon ioTyCon_NAME `thenNF_Tc` \ ioTyCon ->
let
new_arg_dict (arg, arg_ty)
- = newDicts (CCallOrigin (_UNPK_ lbl) (Just arg))
- [(cCallableClass, [arg_ty])] `thenNF_Tc` \ (arg_dicts, _) ->
+ = newClassDicts (CCallOrigin (_UNPK_ lbl) (Just arg))
+ [(cCallableClass, [arg_ty])] `thenNF_Tc` \ (arg_dicts, _) ->
returnNF_Tc arg_dicts -- Actually a singleton bag
result_origin = CCallOrigin (_UNPK_ lbl) Nothing {- Not an arg -}
-- Construct the extra insts, which encode the
-- constraints on the argument and result types.
mapNF_Tc new_arg_dict (zipEqual "tcMonoExpr:CCall" args arg_tys) `thenNF_Tc` \ ccarg_dicts_s ->
- newDicts result_origin [(cReturnableClass, [result_ty])] `thenNF_Tc` \ (ccres_dict, _) ->
- returnTc (HsApp (HsVar (dataConId ioDataCon) `TyApp` [result_ty])
- (CCall lbl args' may_gc is_asm result_ty),
- -- do the wrapping in the newtype constructor here
+ newClassDicts result_origin [(cReturnableClass, [result_ty])] `thenNF_Tc` \ (ccres_dict, _) ->
+ returnTc (HsCCall lbl args' may_gc is_asm io_result_ty,
foldr plusLIE ccres_dict ccarg_dicts_s `plusLIE` args_lie)
\end{code}
let
(_, record_ty) = splitFunTys con_tau
in
- -- Con is syntactically constrained to be a data constructor
ASSERT( maybeToBool (splitAlgTyConApp_maybe record_ty ) )
unifyTauTy res_ty record_ty `thenTc_`
-- Check that the record bindings match the constructor
+ -- con_name is syntactically constrained to be a data constructor
tcLookupDataCon con_name `thenTc` \ (data_con, _, _) ->
let
bad_fields = badFields rbinds data_con
let
(tyvars, theta, _, _, _, _) = dataConSig (head data_cons)
inst_env = mkTopTyVarSubst tyvars result_inst_tys
- theta' = substTheta inst_env theta
+ theta' = substClasses inst_env theta
in
- newDicts RecordUpdOrigin theta' `thenNF_Tc` \ (con_lie, dicts) ->
+ newClassDicts RecordUpdOrigin theta' `thenNF_Tc` \ (con_lie, dicts) ->
-- Phew!
returnTc (RecordUpdOut record_expr' result_record_ty dicts rbinds',
\begin{code}
tcMonoExpr in_expr@(ExprWithTySig expr poly_ty) res_ty
= tcSetErrCtxt (exprSigCtxt in_expr) $
- tcHsType poly_ty `thenTc` \ sig_tc_ty ->
+ tcHsSigType poly_ty `thenTc` \ sig_tc_ty ->
if not (isForAllTy sig_tc_ty) then
-- Easy case
returnTc (expr, lie)
\end{code}
+Implicit Parameter bindings.
+
+\begin{code}
+tcMonoExpr (HsWith expr binds) res_ty
+ = tcMonoExpr expr res_ty `thenTc` \ (expr', lie) ->
+ tcIPBinds binds `thenTc` \ (binds', types, lie2) ->
+ partitionPredsOfLIE isBound lie `thenTc` \ (ips, lie', dict_binds) ->
+ pprTrace "tcMonoExpr With" (ppr (ips, lie', dict_binds)) $
+ let expr'' = if nullMonoBinds dict_binds
+ then expr'
+ else HsLet (mkMonoBind (revBinds dict_binds) [] NonRecursive)
+ expr'
+ in
+ tcCheckIPBinds binds' types ips `thenTc_`
+ returnTc (HsWith expr'' binds', lie' `plusLIE` lie2)
+ where isBound p
+ = case ipName_maybe p of
+ Just n -> n `elem` names
+ Nothing -> False
+ names = map fst binds
+ -- revBinds is used because tcSimplify outputs the bindings
+ -- out-of-order. it's not a problem elsewhere because these
+ -- bindings are normally used in a recursive let
+ -- ZZ probably need to find a better solution
+ revBinds (b1 `AndMonoBinds` b2) =
+ (revBinds b2) `AndMonoBinds` (revBinds b1)
+ revBinds b = b
+
+tcIPBinds ((name, expr) : binds)
+ = newTyVarTy_OpenKind `thenTc` \ ty ->
+ tcGetSrcLoc `thenTc` \ loc ->
+ let id = ipToId name ty loc in
+ tcMonoExpr expr ty `thenTc` \ (expr', lie) ->
+ zonkTcType ty `thenTc` \ ty' ->
+ tcIPBinds binds `thenTc` \ (binds', types, lie2) ->
+ returnTc ((id, expr') : binds', ty : types, lie `plusLIE` lie2)
+tcIPBinds [] = returnTc ([], [], emptyLIE)
+
+tcCheckIPBinds binds types ips
+ = foldrTc tcCheckIPBind (getIPsOfLIE ips) (zip binds types)
+
+-- ZZ how do we use the loc?
+tcCheckIPBind bt@((v, _), t1) ((n, t2) : ips) | getName v == n
+ = unifyTauTy t1 t2 `thenTc_`
+ tcCheckIPBind bt ips `thenTc` \ ips' ->
+ returnTc ips'
+tcCheckIPBind bt (ip : ips)
+ = tcCheckIPBind bt ips `thenTc` \ ips' ->
+ returnTc (ip : ips')
+tcCheckIPBind bt []
+ = returnTc []
+\end{code}
+
Typecheck expression which in most cases will be an Id.
\begin{code}
projects / ghc-hetmet.git / blobdiff