LIE, emptyLIE, unitLIE, plusLIE, consLIE, zonkLIE,
plusLIEs, mkLIE, isEmptyLIE, lieToList, listToLIE,
- Inst, OverloadedLit(..),
+ Inst,
pprInst, pprInsts, pprInstsInFull, tidyInst, tidyInsts,
- InstanceMapper,
-
newDictFromOld, newDicts, newClassDicts, newDictsAtLoc,
newMethod, newMethodWithGivenTy, newOverloadedLit,
newIPDict, instOverloadedFun,
#include "HsVersions.h"
-import HsSyn ( HsLit(..), HsExpr(..) )
-import RnHsSyn ( RenamedArithSeqInfo, RenamedHsExpr, RenamedPat )
+import HsSyn ( HsLit(..), HsOverLit(..), HsExpr(..) )
+import RnHsSyn ( RenamedHsOverLit )
import TcHsSyn ( TcExpr, TcId,
mkHsTyApp, mkHsDictApp, mkHsConApp, zonkId
)
import TcMonad
-import TcEnv ( TcIdSet, tcLookupValueByKey, tcLookupTyConByKey )
+import TcEnv ( TcIdSet, tcGetInstEnv, lookupInstEnv, InstLookupResult(..),
+ tcLookupValue, tcLookupValueByKey
+ )
import TcType ( TcThetaType,
TcType, TcTauType, TcTyVarSet,
zonkTcTyVars, zonkTcType, zonkTcTypes,
zonkTcThetaType
)
import Bag
-import Class ( classInstEnv, Class, FunDep )
+import Class ( Class, FunDep )
import FunDeps ( instantiateFdClassTys )
import Id ( Id, idFreeTyVars, idType, mkUserLocal, mkSysLocal )
import PrelInfo ( isStandardClass, isCcallishClass, isNoDictClass )
-import Name ( OccName, Name, mkDictOcc, mkMethodOcc, mkIPOcc,
- getOccName, nameUnique )
+import Name ( mkDictOcc, mkMethodOcc, mkIPOcc, getOccName, nameUnique )
import PprType ( pprPred )
-import InstEnv ( InstEnv, lookupInstEnv )
-import SrcLoc ( SrcLoc )
-import Type ( Type, PredType(..), ThetaType,
- mkTyVarTy, isTyVarTy, mkDictTy, mkPredTy,
- splitForAllTys, splitSigmaTy,
+import Type ( Type, PredType(..),
+ isTyVarTy, mkDictTy, mkPredTy,
+ splitForAllTys, splitSigmaTy, funArgTy,
splitRhoTy, tyVarsOfType, tyVarsOfTypes, tyVarsOfPred,
- mkSynTy, tidyOpenType, tidyOpenTypes
+ tidyOpenType, tidyOpenTypes
)
-import InstEnv ( InstEnv )
-import Subst ( emptyInScopeSet, mkSubst,
+import Subst ( emptyInScopeSet, mkSubst, mkInScopeSet,
substTy, substClasses, mkTyVarSubst, mkTopTyVarSubst
)
-import TyCon ( TyCon )
import Literal ( inIntRange )
-import Var ( TyVar )
-import VarEnv ( lookupVarEnv, TidyEnv,
- lookupSubstEnv, SubstResult(..)
- )
+import VarEnv ( TidyEnv, lookupSubstEnv, SubstResult(..) )
import VarSet ( elemVarSet, emptyVarSet, unionVarSet )
-import TysPrim ( intPrimTy, floatPrimTy, doublePrimTy )
-import TysWiredIn ( intDataCon, isIntTy,
+import TysWiredIn ( isIntTy,
floatDataCon, isFloatTy,
doubleDataCon, isDoubleTy,
- integerTy, isIntegerTy,
- voidTy
+ isIntegerTy, voidTy
)
-import Unique ( fromRationalClassOpKey, rationalTyConKey,
- fromIntClassOpKey, fromIntegerClassOpKey, Unique
- )
-import Maybes ( expectJust )
+import PrelNames( Unique, hasKey, fromIntClassOpKey, fromIntegerClassOpKey )
import Maybe ( catMaybes )
import Util ( thenCmp, zipWithEqual, mapAccumL )
import Outputable
| LitInst
Unique
- OverloadedLit
- TcType -- The type at which the literal is used
+ RenamedHsOverLit -- The literal from the occurrence site
+ TcType -- The type at which the literal is used
InstLoc
| FunDep
Class -- the class from which this arises
[FunDep TcType]
InstLoc
-
-data OverloadedLit
- = OverloadedIntegral Integer -- The number
- | OverloadedFractional Rational -- The number
\end{code}
Ordering
cmpInst (Method _ id1 tys1 _ _ _) (Method _ id2 tys2 _ _ _) = (id1 `compare` id2) `thenCmp` (tys1 `compare` tys2)
cmpInst (Method _ _ _ _ _ _) other = LT
-cmpInst (LitInst _ lit1 ty1 _) (LitInst _ lit2 ty2 _) = (lit1 `cmpOverLit` lit2) `thenCmp` (ty1 `compare` ty2)
+cmpInst (LitInst _ lit1 ty1 _) (LitInst _ lit2 ty2 _) = (lit1 `compare` lit2) `thenCmp` (ty1 `compare` ty2)
cmpInst (LitInst _ _ _ _) (FunDep _ _ _ _) = LT
cmpInst (LitInst _ _ _ _) other = GT
cmpInst (FunDep _ clas1 fds1 _) (FunDep _ clas2 fds2 _) = (clas1 `compare` clas2) `thenCmp` (fds1 `compare` fds2)
cmpInst (FunDep _ _ _ _) other = GT
-cmpOverLit (OverloadedIntegral i1) (OverloadedIntegral i2) = i1 `compare` i2
-cmpOverLit (OverloadedFractional f1) (OverloadedFractional f2) = f1 `compare` f2
-cmpOverLit (OverloadedIntegral _) (OverloadedFractional _) = LT
-cmpOverLit (OverloadedFractional _) (OverloadedIntegral _) = GT
+-- and they can only have HsInt or HsFracs in them.
\end{code}
isDict :: Inst -> Bool
isDict (Dict _ _ _) = True
isDict other = False
+
isClassDict :: Inst -> Bool
isClassDict (Dict _ (Class _ _) _) = True
isClassDict other = False
isMethod other = False
isMethodFor :: TcIdSet -> Inst -> Bool
-isMethodFor ids (Method uniq id tys _ _ loc)
- = id `elemVarSet` ids
-isMethodFor ids inst
- = False
+isMethodFor ids (Method uniq id tys _ _ loc) = id `elemVarSet` ids
+isMethodFor ids inst = False
isTyVarDict :: Inst -> Bool
isTyVarDict (Dict _ (Class _ tys) _) = all isTyVarTy tys
\begin{code}
newOverloadedLit :: InstOrigin
- -> OverloadedLit
+ -> RenamedHsOverLit
-> TcType
-> NF_TcM s (TcExpr, LIE)
-newOverloadedLit orig (OverloadedIntegral i) ty
+newOverloadedLit orig (HsIntegral i _) ty
| isIntTy ty && inIntRange i -- Short cut for Int
= returnNF_Tc (int_lit, emptyLIE)
= returnNF_Tc (integer_lit, emptyLIE)
where
- intprim_lit = HsLitOut (HsIntPrim i) intPrimTy
- integer_lit = HsLitOut (HsInt i) integerTy
- int_lit = mkHsConApp intDataCon [] [intprim_lit]
+ int_lit = HsLit (HsInt i)
+ integer_lit = HsLit (HsInteger i)
newOverloadedLit orig lit ty -- The general case
= tcGetInstLoc orig `thenNF_Tc` \ loc ->
\begin{code}
newFunDepFromDict dict
+ | isClassDict dict
= tcGetUnique `thenNF_Tc` \ uniq ->
let (clas, tys) = getDictClassTys dict
fds = instantiateFdClassTys clas tys
inst = FunDep uniq clas fds (instLoc dict)
in
if null fds then returnNF_Tc Nothing else returnNF_Tc (Just inst)
+ | otherwise
+ = returnNF_Tc Nothing
\end{code}
\begin{code}
= zonkFunDeps fds `thenNF_Tc` \ fds' ->
returnNF_Tc (FunDep u clas fds' loc)
-zonkPreds preds = mapNF_Tc zonkPred preds
zonkInsts insts = mapNF_Tc zonkInst insts
zonkFunDeps fds = mapNF_Tc zonkFd fds
ppr inst = pprInst inst
pprInst (LitInst u lit ty loc)
- = hsep [case lit of
- OverloadedIntegral i -> integer i
- OverloadedFractional f -> rational f,
- ptext SLIT("at"),
- ppr ty,
- show_uniq u]
+ = hsep [ppr lit, ptext SLIT("at"), ppr ty, show_uniq u]
pprInst (Dict u pred loc) = pprPred pred <+> show_uniq u
%************************************************************************
\begin{code}
-type InstanceMapper = Class -> InstEnv
-\end{code}
-
-A @ClassInstEnv@ lives inside a class, and identifies all the instances
-of that class. The @Id@ inside a ClassInstEnv mapping is the dfun for
-that instance.
-
-There is an important consistency constraint between the @MatchEnv@s
-in and the dfun @Id@s inside them: the free type variables of the
-@Type@ key in the @MatchEnv@ must be a subset of the universally-quantified
-type variables of the dfun. Thus, the @ClassInstEnv@ for @Eq@ might
-contain the following entry:
-@
- [a] ===> dfun_Eq_List :: forall a. Eq a => Eq [a]
-@
-The "a" in the pattern must be one of the forall'd variables in
-the dfun type.
-
-\begin{code}
data LookupInstResult s
= NoInstance
| SimpleInst TcExpr -- Just a variable, type application, or literal
-- Dictionaries
lookupInst dict@(Dict _ (Class clas tys) loc)
- = case lookupInstEnv (ppr clas) (classInstEnv clas) tys of
+ = tcGetInstEnv `thenNF_Tc` \ inst_env ->
+ case lookupInstEnv inst_env clas tys of
- Just (tenv, dfun_id)
+ FoundInst tenv dfun_id
-> let
- subst = mkSubst (tyVarsOfTypes tys) tenv
+ subst = mkSubst (mkInScopeSet (tyVarsOfTypes tys)) tenv
(tyvars, rho) = splitForAllTys (idType dfun_id)
ty_args = map subst_tv tyvars
dfun_rho = substTy subst rho
- (theta, tau) = splitRhoTy dfun_rho
+ (theta, _) = splitRhoTy dfun_rho
ty_app = mkHsTyApp (HsVar dfun_id) ty_args
subst_tv tv = case lookupSubstEnv tenv tv of
Just (DoneTy ty) -> ty
in
returnNF_Tc (GenInst dicts rhs)
- Nothing -> returnNF_Tc NoInstance
+ other -> returnNF_Tc NoInstance
lookupInst dict@(Dict _ _ loc) = returnNF_Tc NoInstance
-- Methods
-- Literals
-lookupInst inst@(LitInst u (OverloadedIntegral i) ty loc)
+lookupInst inst@(LitInst u (HsIntegral i from_integer_name) ty loc)
| isIntTy ty && in_int_range -- Short cut for Int
= returnNF_Tc (GenInst [] int_lit)
-- GenInst, not SimpleInst, because int_lit is actually a constructor application
| isIntegerTy ty -- Short cut for Integer
= returnNF_Tc (GenInst [] integer_lit)
- | in_int_range -- It's overloaded but small enough to fit into an Int
- = tcLookupValueByKey fromIntClassOpKey `thenNF_Tc` \ from_int ->
+ | in_int_range -- It's overloaded but small enough to fit into an Int
+ && from_integer_name `hasKey` fromIntegerClassOpKey -- And it's the built-in prelude fromInteger
+ -- (i.e. no funny business with user-defined
+ -- packages of numeric classes)
+ = -- So we can use the Prelude fromInt
+ tcLookupValueByKey fromIntClassOpKey `thenNF_Tc` \ from_int ->
newMethodAtLoc loc from_int [ty] `thenNF_Tc` \ (method_inst, method_id) ->
returnNF_Tc (GenInst [method_inst] (HsApp (HsVar method_id) int_lit))
| otherwise -- Alas, it is overloaded and a big literal!
- = tcLookupValueByKey fromIntegerClassOpKey `thenNF_Tc` \ from_integer ->
+ = tcLookupValue from_integer_name `thenNF_Tc` \ from_integer ->
newMethodAtLoc loc from_integer [ty] `thenNF_Tc` \ (method_inst, method_id) ->
returnNF_Tc (GenInst [method_inst] (HsApp (HsVar method_id) integer_lit))
where
in_int_range = inIntRange i
- intprim_lit = HsLitOut (HsIntPrim i) intPrimTy
- integer_lit = HsLitOut (HsInt i) integerTy
- int_lit = mkHsConApp intDataCon [] [intprim_lit]
+ integer_lit = HsLit (HsInteger i)
+ int_lit = HsLit (HsInt i)
-- similar idea for overloaded floating point literals: if the literal is
-- *definitely* a float or a double, generate the real thing here.
-- This is essential (see nofib/spectral/nucleic).
-lookupInst inst@(LitInst u (OverloadedFractional f) ty loc)
+lookupInst inst@(LitInst u (HsFractional f from_rat_name) ty loc)
| isFloatTy ty = returnNF_Tc (GenInst [] float_lit)
| isDoubleTy ty = returnNF_Tc (GenInst [] double_lit)
| otherwise
- = tcLookupValueByKey fromRationalClassOpKey `thenNF_Tc` \ from_rational ->
-
- -- The type Rational isn't wired in so we have to conjure it up
- tcLookupTyConByKey rationalTyConKey `thenNF_Tc` \ rational_tycon ->
+ = tcLookupValue from_rat_name `thenNF_Tc` \ from_rational ->
+ newMethodAtLoc loc from_rational [ty] `thenNF_Tc` \ (method_inst, method_id) ->
let
- rational_ty = mkSynTy rational_tycon []
- rational_lit = HsLitOut (HsFrac f) rational_ty
+ rational_ty = funArgTy (idType method_id)
+ rational_lit = HsLit (HsRat f rational_ty)
in
- newMethodAtLoc loc from_rational [ty] `thenNF_Tc` \ (method_inst, method_id) ->
returnNF_Tc (GenInst [method_inst] (HsApp (HsVar method_id) rational_lit))
where
- floatprim_lit = HsLitOut (HsFloatPrim f) floatPrimTy
+ floatprim_lit = HsLit (HsFloatPrim f)
float_lit = mkHsConApp floatDataCon [] [floatprim_lit]
- doubleprim_lit = HsLitOut (HsDoublePrim f) doublePrimTy
+ doubleprim_lit = HsLit (HsDoublePrim f)
double_lit = mkHsConApp doubleDataCon [] [doubleprim_lit]
-- there are no `instances' of functional dependencies or implicit params
ambiguous dictionaries.
\begin{code}
-lookupSimpleInst :: InstEnv
- -> Class
+lookupSimpleInst :: Class
-> [Type] -- Look up (c,t)
-> NF_TcM s (Maybe [(Class,[Type])]) -- Here are the needed (c,t)s
-lookupSimpleInst class_inst_env clas tys
- = case lookupInstEnv (ppr clas) class_inst_env tys of
- Nothing -> returnNF_Tc Nothing
-
- Just (tenv, dfun)
+lookupSimpleInst clas tys
+ = tcGetInstEnv `thenNF_Tc` \ inst_env ->
+ case lookupInstEnv inst_env clas tys of
+ FoundInst tenv dfun
-> returnNF_Tc (Just (substClasses (mkSubst emptyInScopeSet tenv) theta'))
where
(_, theta, _) = splitSigmaTy (idType dfun)
theta' = map (\(Class clas tys) -> (clas,tys)) theta
+
+ other -> returnNF_Tc Nothing
\end{code}
+
+
projects / ghc-hetmet.git / blobdiff