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 )
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
-> Module -- Module for deriving
- -> FixityEnv -- For derivings
- -> RnNameSupply -- For renaming derivings
- -> TcM s (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 ->
+ -> [RenamedHsDecl]
+ -> TcM (PersistentCompilerState, InstEnv, [InstInfo], RenamedHsBinds)
+tcInstDecls1 pcs hst unf_env this_mod decls mod
+ = let
+ inst_decls = [inst_decl | InstD inst_decl <- decls]
+ clas_decls = [clas_decl | TyClD clas_decl <- decls, isClassDecl cl_decl]
+ in
+ -- (1) Do the ordinary instance declarations
+ mapNF_Tc (tcInstDecl1 mod) inst_decls `thenNF_Tc` \ inst_infos ->
+
+ -- (2) Instances from generic class declarations
+ getGenericInstances mod clas_decls `thenTc` \ generic_inst_info ->
+
+ -- Next, consruct 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)
+ generic_inst_info = concat generic_inst_infos -- All local
+
+ imported_dfuns = map (tcAddImportedIdInfo unf_env . instInfoDFun) 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
- ioToTc (dumpIfSet opt_D_dump_deriv "Generic instances"
- (vcat (map pprInstInfo generic_insts))) `thenNF_Tc_`
- (returnTc (full_inst_info, deriv_binds))
+ -- (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 ->
+
+ 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 iDFun infos)
+
+addInstDFuns :: InstEnv -> [DFunId] -> NF_TcM InstEnv
+addInstDFuns dfuns infos
+ = addErrsTc errs `thenNF_Tc_`
+ returnTc inst_env'
+ where
+ (inst_env', errs) = extendInstEnv env dfuns
\end{code}
\begin{code}
-tcInstDecl1 :: Module -> ValueEnv -> RenamedInstDecl -> NF_TcM s (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"
-- 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 s [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
+ ioToTc (dumpIfSet 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
+ 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 $
- tcLookupTy class_name `thenTc` \ (AClass clas) ->
+ tcLookupClass class_name `thenTc` \ clas ->
-- Make an InstInfo out of each group
mapTc (mkGenericInstance mod clas loc) groups `thenTc` \ inst_infos ->
---------------------------------
mkGenericInstance :: Module -> Class -> SrcLoc
-> (RenamedHsType, RenamedMonoBinds)
- -> TcM s InstInfo
+ -> TcM InstInfo
mkGenericInstance mod clas loc (hs_ty, binds)
-- Make a generic instance declaration
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
- -> NF_TcM s (LIE, TcMonoBinds)
+ -> NF_TcM (LIE, TcMonoBinds)
tcInstDecls2 inst_decls
= foldBag combine tcInstDecl2 (returnNF_Tc (emptyLIE, EmptyMonoBinds)) inst_decls
First comes the easy case of a non-local instance decl.
\begin{code}
-tcInstDecl2 :: InstInfo -> NF_TcM s (LIE, TcMonoBinds)
+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)
projects / ghc-hetmet.git / blobdiff