#include "HsVersions.h"
-import CmdLineOpts ( opt_GlasgowExts, opt_AllowUndecidableInstances, opt_D_dump_deriv )
+import CmdLineOpts ( DynFlag(..), dopt )
import HsSyn ( HsDecl(..), InstDecl(..), TyClDecl(..),
MonoBinds(..), HsExpr(..), HsLit(..), Sig(..),
import HsTypes ( HsType (..), HsTyVarBndr(..), toHsTyVar )
import HsPat ( InPat (..) )
import HsMatches ( Match (..) )
-import RnHsSyn ( RenamedHsBinds, RenamedInstDecl, RenamedHsDecl, extractHsTyVars )
+import RnHsSyn ( RenamedHsBinds, RenamedInstDecl, RenamedHsDecl,
+ extractHsTyVars )
import TcHsSyn ( TcMonoBinds, mkHsConApp )
import TcBinds ( tcSpecSigs )
import TcClassDcl ( tcMethodBind, badMethodErr )
import TcMonad
-import RnMonad ( RnNameSupply, FixityEnv )
import Inst ( InstOrigin(..),
newDicts, newClassDicts,
LIE, emptyLIE, plusLIE, plusLIEs )
tcAddImportedIdInfo, tcInstId, tcLookupClass,
newDFunName, tcExtendTyVarEnv
)
-import TcInstUtil ( InstInfo(..), pprInstInfo, classDataCon, simpleInstInfoTyCon, simpleInstInfoTy )
+import InstEnv ( InstInfo(..), InstEnv, pprInstInfo, classDataCon,
+ simpleInstInfoTyCon, simpleInstInfoTy, isLocalInst,
+ extendInstEnv )
import TcMonoType ( tcTyVars, tcHsSigType, tcHsType, kcHsSigType )
import TcSimplify ( tcSimplifyAndCheck )
import TcType ( zonkTcSigTyVars )
+import HscTypes ( PersistentCompilerState(..), HomeSymbolTable, DFunId,
+ ModDetails(..) )
import Bag ( emptyBag, unitBag, unionBags, unionManyBags,
foldBag, Bag, listToBag
import Maybes ( maybeToBool, expectJust )
import MkId ( mkDictFunId )
import Generics ( validGenericInstanceType )
-import Module ( Module )
+import Module ( Module, foldModuleEnv )
import Name ( isLocallyDefined )
import NameSet ( emptyNameSet, nameSetToList )
import PrelInfo ( eRROR_ID )
import PprType ( pprConstraint, pprPred )
-import TyCon ( isSynTyCon, tyConDerivings )
-import Type ( mkTyVarTys, splitSigmaTy, isTyVarTy,
- splitTyConApp_maybe, splitDictTy_maybe,
+import TyCon ( TyCon, isSynTyCon, tyConDerivings )
+import Type ( mkTyVarTys, splitDFunTy, isTyVarTy,
+ splitTyConApp_maybe, splitDictTy,
splitAlgTyConApp_maybe, classesToPreds, classesOfPreds,
unUsgTy, tyVarsOfTypes, mkClassPred, mkTyVarTy,
getClassTys_maybe
import UniqFM ( mapUFM )
import Unique ( Uniquable(..) )
import BasicTypes ( NewOrData(..) )
-import ErrUtils ( dumpIfSet )
+import ErrUtils ( dumpIfSet_dyn )
import ListSetOps ( Assoc, emptyAssoc, plusAssoc_C, mapAssoc,
assocElts, extendAssoc_C,
equivClassesByUniq, minusList
)
-import List ( intersect, (\\) )
+import List ( intersect, (\\), partition )
import Outputable
\end{code}
tcInstDecls1 :: PersistentCompilerState
-> HomeSymbolTable -- Contains instances
-> TcEnv -- Contains IdInfo for dfun ids
+ -> (Name -> Maybe Fixity) -- for deriving Show and Read
-> Module -- Module for deriving
+ -> [TyCon]
-> [RenamedHsDecl]
-> TcM (PersistentCompilerState, InstEnv, [InstInfo], RenamedHsBinds)
-tcInstDecls1 pcs hst unf_env this_mod decls mod
+tcInstDecls1 pcs hst unf_env get_fixity mod local_tycons decls
= let
inst_decls = [inst_decl | InstD inst_decl <- decls]
- clas_decls = [clas_decl | TyClD clas_decl <- decls, isClassDecl cl_decl]
+ clas_decls = [clas_decl | TyClD clas_decl <- decls, isClassDecl clas_decl]
in
-- (1) Do the ordinary instance declarations
- mapNF_Tc (tcInstDecl1 mod) inst_decls `thenNF_Tc` \ inst_infos ->
+ mapNF_Tc (tcInstDecl1 mod unf_env) inst_decls `thenNF_Tc` \ inst_infos ->
-- (2) Instances from generic class declarations
- getGenericInstances mod clas_decls `thenTc` \ generic_inst_info ->
+ getGenericInstances mod clas_decls `thenTc` \ generic_inst_info ->
- -- Next, consruct the instance environment so far, consisting of
+ -- Next, construct the instance environment so far, consisting of
-- a) cached non-home-package InstEnv (gotten from pcs) pcs_insts pcs
-- b) imported instance decls (not in the home package) inst_env1
-- c) other modules in this package (gotten from hst) inst_env2
-- e) generic instances inst_env4
-- The result of (b) replaces the cached InstEnv in the PCS
let
- (local_inst_info, imported_inst_info) = partition isLocalInst (concat inst_infos)
- generic_inst_info = concat generic_inst_infos -- All local
+ (local_inst_info, imported_inst_info)
+ = partition isLocalInst (concat inst_infos)
- imported_dfuns = map (tcAddImportedIdInfo unf_env . instInfoDFun) imported_inst_info
+ imported_dfuns = map (tcAddImportedIdInfo unf_env . iDFunId)
+ imported_inst_info
hst_dfuns = foldModuleEnv ((++) . md_insts) [] hst
in
addInstDFuns (pcs_insts pcs) imported_dfuns `thenNF_Tc` \ inst_env1 ->
addInstDFuns inst_env1 hst_dfuns `thenNF_Tc` \ inst_env2 ->
addInstInfos inst_env2 local_inst_info `thenNF_Tc` \ inst_env3 ->
addInstInfos inst_env3 generic_inst_info `thenNF_Tc` \ inst_env4 ->
- in
-- (3) Compute instances from "deriving" clauses;
-- note that we only do derivings for things in this module;
-- we ignore deriving decls from interfaces!
-- This stuff computes a context for the derived instance decl, so it
-- needs to know about all the instances possible; hecne inst_env4
- tcDeriving (pcs_PRS pcs) this_mod inst_env4 local_tycons `thenTc` \ (deriv_inst_info, deriv_binds) ->
- addInstInfos inst_env4 deriv_inst_info `thenNF_Tc` \ final_inst_env ->
+ tcDeriving (pcs_PRS pcs) mod inst_env4 get_fixity local_tycons
+ `thenTc` \ (deriv_inst_info, deriv_binds) ->
+ addInstInfos inst_env4 deriv_inst_info
+ `thenNF_Tc` \ final_inst_env ->
returnTc (pcs { pcs_insts = inst_env1 },
final_inst_env,
deriv_binds)
addInstInfos :: InstEnv -> [InstInfo] -> NF_TcM InstEnv
-addInstInfos inst_env infos = addInstDfuns inst_env (map iDFun infos)
+addInstInfos inst_env infos = addInstDFuns inst_env (map iDFunId infos)
addInstDFuns :: InstEnv -> [DFunId] -> NF_TcM InstEnv
addInstDFuns dfuns infos
- = addErrsTc errs `thenNF_Tc_`
+ = getDOptsTc `thenTc` \ dflags ->
+ extendInstEnv dflags dfuns infos `bind` \ (inst_env', errs) ->
+ addErrsTc errs `thenNF_Tc_`
returnTc inst_env'
where
- (inst_env', errs) = extendInstEnv env dfuns
+ bind x f = f x
+
\end{code}
\begin{code}
-- Type-check all the stuff before the "where"
tcHsSigType poly_ty `thenTc` \ poly_ty' ->
let
- (tyvars, theta, dict_ty) = splitSigmaTy poly_ty'
- (clas, inst_tys) = case splitDictTy_maybe dict_ty of
- Just ct -> ct
- Nothing -> pprPanic "tcInstDecl1" (ppr poly_ty)
+ (tyvars, theta, clas, inst_tys) = splitDFunTy poly_ty'
in
(case maybe_dfun_name of
\begin{code}
getGenericInstances :: Module -> [RenamedTyClDecl] -> TcM [InstInfo]
getGenericInstances mod class_decls
- = mapTc (get_generics mod) class_decls `thenTc` \ gen_inst_infos ->
+ = mapTc (get_generics mod) class_decls `thenTc` \ gen_inst_infos ->
let
gen_inst_info = concat gen_inst_infos
in
- ioToTc (dumpIfSet opt_D_dump_deriv "Generic instances"
- (vcat (map pprInstInfo gen_inst_info))) `thenNF_Tc_`
+ getDOptsTc `thenTc` \ dflags ->
+ ioToTc (dumpIfSet_dyn dflags Opt_D_dump_deriv "Generic instances"
+ (vcat (map pprInstInfo gen_inst_info)))
+ `thenNF_Tc_`
returnTc gen_inst_info
get_generics mod decl@(ClassDecl context class_name tyvar_names
- fundeps class_sigs def_methods pragmas
+ fundeps class_sigs def_methods
name_list loc)
| null groups
= returnTc [] -- The comon case:
%************************************************************************
\begin{code}
-tcInstDecls2 :: Bag InstInfo
+tcInstDecls2 :: [InstInfo]
-> NF_TcM (LIE, TcMonoBinds)
tcInstDecls2 inst_decls
- = foldBag combine tcInstDecl2 (returnNF_Tc (emptyLIE, EmptyMonoBinds)) inst_decls
+-- = foldBag combine tcInstDecl2 (returnNF_Tc (emptyLIE, EmptyMonoBinds)) inst_decls
+ = foldr combine (returnNF_Tc (emptyLIE, EmptyMonoBinds))
+ (map tcInstDecl2 inst_decls)
where
combine tc1 tc2 = tc1 `thenNF_Tc` \ (lie1, binds1) ->
tc2 `thenNF_Tc` \ (lie2, binds2) ->
-- Instantiate the instance decl with tc-style type variables
tcInstId dfun_id `thenNF_Tc` \ (inst_tyvars', dfun_theta', dict_ty') ->
let
- (clas, inst_tys') = expectJust "tcInstDecl2" (splitDictTy_maybe dict_ty')
+ (clas, inst_tys') = splitDictTy dict_ty'
origin = InstanceDeclOrigin
(class_tyvars, sc_theta, _, op_items) = classBigSig clas
\begin{code}
scrutiniseInstanceConstraint pred
- | opt_AllowUndecidableInstances
- = returnNF_Tc ()
+ = getDOptsTc `thenTc` \ dflags -> case () of
+ ()
+ | dopt Opt_AllowUndecidableInstances dflags
+ -> returnNF_Tc ()
- | Just (clas,tys) <- getClassTys_maybe pred,
- all isTyVarTy tys
- = returnNF_Tc ()
+ | Just (clas,tys) <- getClassTys_maybe pred,
+ all isTyVarTy tys
+ -> returnNF_Tc ()
- | otherwise
- = addErrTc (instConstraintErr pred)
+ | otherwise
+ -> addErrTc (instConstraintErr pred)
scrutiniseInstanceHead clas inst_taus
- | -- CCALL CHECK
+ = getDOptsTc `thenTc` \ dflags -> case () of
+ ()
+ | -- CCALL CHECK
-- A user declaration of a CCallable/CReturnable instance
-- must be for a "boxed primitive" type.
- (clas `hasKey` cCallableClassKey && not (ccallable_type first_inst_tau)) ||
- (clas `hasKey` cReturnableClassKey && not (creturnable_type first_inst_tau))
- = addErrTc (nonBoxedPrimCCallErr clas first_inst_tau)
+ (clas `hasKey` cCallableClassKey
+ && not (ccallable_type dflags first_inst_tau))
+ ||
+ (clas `hasKey` cReturnableClassKey
+ && not (creturnable_type first_inst_tau))
+ -> addErrTc (nonBoxedPrimCCallErr clas first_inst_tau)
-- DERIVING CHECK
-- It is obviously illegal to have an explicit instance
-- for something that we are also planning to `derive'
- | maybeToBool alg_tycon_app_maybe && clas `elem` (tyConDerivings alg_tycon)
- = addErrTc (derivingWhenInstanceExistsErr clas first_inst_tau)
+ | maybeToBool alg_tycon_app_maybe && clas `elem` (tyConDerivings alg_tycon)
+ -> addErrTc (derivingWhenInstanceExistsErr clas first_inst_tau)
-- Kind check will have ensured inst_taus is of length 1
-- Allow anything for AllowUndecidableInstances
- | opt_AllowUndecidableInstances
- = returnNF_Tc ()
+ | dopt Opt_AllowUndecidableInstances dflags
+ -> returnNF_Tc ()
-- If GlasgowExts then check at least one isn't a type variable
- | opt_GlasgowExts
- = if all isTyVarTy inst_taus then
- addErrTc (instTypeErr clas inst_taus (text "There must be at least one non-type-variable in the instance head"))
- else
- returnNF_Tc ()
+ | dopt Opt_GlasgowExts dflags
+ -> if all isTyVarTy inst_taus
+ then addErrTc (instTypeErr clas inst_taus
+ (text "There must be at least one non-type-variable in the instance head"))
+ else returnNF_Tc ()
-- WITH HASKELL 1.4, MUST HAVE C (T a b c)
- | not (length inst_taus == 1 &&
- maybeToBool maybe_tycon_app && -- Yes, there's a type constuctor
- not (isSynTyCon tycon) && -- ...but not a synonym
- all isTyVarTy arg_tys && -- Applied to type variables
- length (varSetElems (tyVarsOfTypes arg_tys)) == length arg_tys
- -- This last condition checks that all the type variables are distinct
- )
- = addErrTc (instTypeErr clas inst_taus
- (text "the instance type must be of form (T a b c)" $$
- text "where T is not a synonym, and a,b,c are distinct type variables")
- )
-
- | otherwise
- = returnNF_Tc ()
+ | not (length inst_taus == 1 &&
+ maybeToBool maybe_tycon_app && -- Yes, there's a type constuctor
+ not (isSynTyCon tycon) && -- ...but not a synonym
+ all isTyVarTy arg_tys && -- Applied to type variables
+ length (varSetElems (tyVarsOfTypes arg_tys)) == length arg_tys
+ -- This last condition checks that all the type variables are distinct
+ )
+ -> addErrTc (instTypeErr clas inst_taus
+ (text "the instance type must be of form (T a b c)" $$
+ text "where T is not a synonym, and a,b,c are distinct type variables")
+ )
+
+ | otherwise
+ -> returnNF_Tc ()
where
(first_inst_tau : _) = inst_taus
-- The "Alg" part looks through synonyms
Just (alg_tycon, _, _) = alg_tycon_app_maybe
-ccallable_type ty = isFFIArgumentTy False {- Not safe call -} ty
-creturnable_type ty = isFFIResultTy ty
+ ccallable_type dflags ty = isFFIArgumentTy dflags False {- Not safe call -} ty
+ creturnable_type ty = isFFIResultTy ty
\end{code}
where
(name, loc, thing)
= case decl of
- (ClassDecl _ name _ _ _ _ _ _ loc) -> (name, loc, "class")
- (TySynonym name _ _ loc) -> (name, loc, "type synonym")
- (TyData NewType _ name _ _ _ _ _ loc _ _) -> (name, loc, "newtype")
- (TyData DataType _ name _ _ _ _ _ loc _ _) -> (name, loc, "data type")
+ (ClassDecl _ name _ _ _ _ _ loc) -> (name, loc, "class")
+ (TySynonym name _ _ loc) -> (name, loc, "type synonym")
+ (TyData NewType _ name _ _ _ _ loc _ _) -> (name, loc, "newtype")
+ (TyData DataType _ name _ _ _ _ loc _ _) -> (name, loc, "data type")
ctxt = hsep [ptext SLIT("In the"), text thing,
ptext SLIT("declaration for"), quotes (ppr name)]
projects / ghc-hetmet.git / blobdiff