#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 )
import TcDeriv ( tcDeriving )
-import TcEnv ( ValueEnv, tcExtendGlobalValEnv,
+import TcEnv ( TcEnv, tcExtendGlobalValEnv,
tcExtendTyVarEnvForMeths, TyThing (..),
- tcAddImportedIdInfo, tcInstId, tcLookupTy,
+ 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}
Gather up the instance declarations from their various sources
\begin{code}
-tcInstDecls1 :: ValueEnv -- Contains IdInfo for dfun ids
- -> [RenamedHsDecl]
+tcInstDecls1 :: PersistentCompilerState
+ -> HomeSymbolTable -- Contains instances
+ -> TcEnv -- Contains IdInfo for dfun ids
+ -> (Name -> Maybe Fixity) -- for deriving Show and Read
-> Module -- Module for deriving
- -> FixityEnv -- For derivings
- -> RnNameSupply -- For renaming derivings
- -> TcM (Bag InstInfo,
- RenamedHsBinds)
-
-tcInstDecls1 unf_env decls mod fixs rn_name_supply
- = -- (1) Do the ordinary instance declarations
- mapNF_Tc (tcInstDecl1 mod unf_env)
- [inst_decl | InstD inst_decl <- decls] `thenNF_Tc` \ inst_info_bags ->
- let
- decl_inst_info = unionManyBags inst_info_bags
- in
- -- (2) Instances from "deriving" clauses; note that we only do derivings
- -- for things in this module; we ignore deriving decls from
- -- interfaces!
- tcDeriving mod fixs rn_name_supply decl_inst_info `thenTc` \ (deriv_inst_info, deriv_binds) ->
-
- -- (3) Instances from generic class declarations
- mapTc (getGenericInstances mod)
- [cl_decl | TyClD cl_decl <- decls, isClassDecl cl_decl] `thenTc` \ cls_inst_info ->
+ -> [TyCon]
+ -> [RenamedHsDecl]
+ -> TcM (PersistentCompilerState, InstEnv, [InstInfo], RenamedHsBinds)
+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 clas_decl]
+ in
+ -- (1) Do the ordinary instance declarations
+ 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 ->
+
+ -- 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
+ -- d) local instance decls inst_env3
+ -- e) generic instances inst_env4
+ -- The result of (b) replaces the cached InstEnv in the PCS
let
- generic_insts = concat cls_inst_info
- full_inst_info = deriv_inst_info `unionBags`
- unionManyBags inst_info_bags `unionBags`
- (listToBag generic_insts)
+ (local_inst_info, imported_inst_info)
+ = partition isLocalInst (concat inst_infos)
+
+ imported_dfuns = map (tcAddImportedIdInfo unf_env . iDFunId)
+ imported_inst_info
+ hst_dfuns = foldModuleEnv ((++) . md_insts) [] hst
in
- ioToTc (dumpIfSet opt_D_dump_deriv "Generic instances"
- (vcat (map pprInstInfo generic_insts))) `thenNF_Tc_`
+ 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 ->
+
+ -- (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) 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,
+ generic_inst_info ++ deriv_inst_info ++ local_inst_info,
+ deriv_binds)
+
+addInstInfos :: InstEnv -> [InstInfo] -> NF_TcM InstEnv
+addInstInfos inst_env infos = addInstDFuns inst_env (map iDFunId infos)
+
+addInstDFuns :: InstEnv -> [DFunId] -> NF_TcM InstEnv
+addInstDFuns dfuns infos
+ = getDOptsTc `thenTc` \ dflags ->
+ extendInstEnv dflags dfuns infos `bind` \ (inst_env', errs) ->
+ addErrsTc errs `thenNF_Tc_`
+ returnTc inst_env'
+ where
+ bind x f = f x
- (returnTc (full_inst_info, deriv_binds))
\end{code}
\begin{code}
-tcInstDecl1 :: Module -> ValueEnv -> RenamedInstDecl -> NF_TcM (Bag InstInfo)
+tcInstDecl1 :: Module -> TcEnv -> RenamedInstDecl -> NF_TcM [InstInfo]
-- Deal with a single instance declaration
tcInstDecl1 mod unf_env (InstDecl poly_ty binds uprags maybe_dfun_name src_loc)
= -- Prime error recovery, set source location
- recoverNF_Tc (returnNF_Tc emptyBag) $
+ recoverNF_Tc (returnNF_Tc []) $
tcAddSrcLoc src_loc $
-- 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
-- Make the dfun id and return it
newDFunName mod clas inst_tys src_loc `thenNF_Tc` \ dfun_name ->
- returnNF_Tc (mkDictFunId dfun_name clas tyvars inst_tys theta)
+ returnNF_Tc (True, mkDictFunId dfun_name clas tyvars inst_tys theta)
Just dfun_name -> -- An interface-file instance declaration
- -- Make the dfun id and add info from interface file
- let
- dfun_id = mkDictFunId dfun_name clas tyvars inst_tys theta
- in
- returnNF_Tc (tcAddImportedIdInfo unf_env dfun_id)
- ) `thenNF_Tc` \ dfun_id ->
-
- returnTc (unitBag (InstInfo clas tyvars inst_tys theta dfun_id binds src_loc uprags))
+ -- Make the dfun id
+ returnNF_Tc (False, mkDictFunId dfun_name clas tyvars inst_tys theta)
+ ) `thenNF_Tc` \ (is_local, dfun_id) ->
+
+ returnTc [InstInfo { iLocal = is_local,
+ iClass = clas, iTyVars = tyvars, iTys = inst_tys,
+ iTheta = theta, iDFunId = dfun_id,
+ iBinds = binds, iLoc = src_loc, iPrags = uprags }]
\end{code}
\begin{code}
-getGenericInstances :: Module -> RenamedTyClDecl -> TcM [InstInfo]
-getGenericInstances mod decl@(ClassDecl context class_name tyvar_names
- fundeps class_sigs def_methods pragmas
- name_list loc)
+getGenericInstances :: Module -> [RenamedTyClDecl] -> TcM [InstInfo]
+getGenericInstances mod class_decls
+ = mapTc (get_generics mod) class_decls `thenTc` \ gen_inst_infos ->
+ let
+ gen_inst_info = concat gen_inst_infos
+ in
+ 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
+ name_list loc)
| null groups
- = returnTc [] -- The comon case
+ = returnTc [] -- The comon case:
+ -- no generic default methods, or
+ -- its an imported class decl (=> has no methods at all)
- | otherwise
+ | otherwise -- A local class decl with generic default methods
= recoverNF_Tc (returnNF_Tc []) $
tcAddDeclCtxt decl $
tcLookupClass class_name `thenTc` \ clas ->
dfun_id = mkDictFunId dfun_name clas tyvars inst_tys inst_theta
in
- returnTc (InstInfo clas tyvars inst_tys inst_theta dfun_id binds loc [])
- -- The "[]" means "no pragmas"
+ returnTc (InstInfo { iLocal = True,
+ iClass = clas, iTyVars = tyvars, iTys = inst_tys,
+ iTheta = inst_theta, iDFunId = dfun_id, iBinds = binds,
+ iLoc = loc, iPrags = [] })
\end{code}
%************************************************************************
\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) ->
\begin{code}
tcInstDecl2 :: InstInfo -> NF_TcM (LIE, TcMonoBinds)
-tcInstDecl2 (InstInfo clas inst_tyvars inst_tys
- inst_decl_theta
- dfun_id monobinds
- locn uprags)
+tcInstDecl2 (InstInfo { iClass = clas, iTyVars = inst_tyvars, iTys = inst_tys,
+ iTheta = inst_decl_theta, iDFunId = dfun_id,
+ iBinds = monobinds, iLoc = locn, iPrags = uprags })
| not (isLocallyDefined dfun_id)
= returnNF_Tc (emptyLIE, EmptyMonoBinds)
-- 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