\begin{code}
module TcModule (
typecheckModule, typecheckIface, typecheckStmt, typecheckExpr,
- typecheckExtraDecls,
+ typecheckExtraDecls, typecheckCoreModule,
TcResults(..)
) where
import CmdLineOpts ( DynFlag(..), DynFlags, dopt )
import HsSyn ( HsBinds(..), MonoBinds(..), HsDecl(..), HsExpr(..),
Stmt(..), InPat(..), HsMatchContext(..), HsDoContext(..), RuleDecl(..),
- isIfaceRuleDecl, nullBinds, andMonoBindList, mkSimpleMatch, placeHolderType
+ isSourceInstDecl, mkSimpleMatch, placeHolderType, isCoreDecl
)
-import PrelNames ( mAIN_Name, mainName, ioTyConName, printName,
- returnIOName, bindIOName, failIOName,
- itName
+import PrelNames ( ioTyConName, printName,
+ returnIOName, bindIOName, failIOName, thenIOName, runMainName,
+ dollarMainName, itName
)
import MkId ( unsafeCoerceId )
-import RnHsSyn ( RenamedHsBinds, RenamedHsDecl, RenamedStmt,
- RenamedHsExpr )
+import RnHsSyn ( RenamedHsDecl, RenamedStmt, RenamedHsExpr,
+ RenamedRuleDecl, RenamedTyClDecl, RenamedInstDecl )
import TcHsSyn ( TypecheckedMonoBinds, TypecheckedHsExpr,
TypecheckedForeignDecl, TypecheckedRuleDecl,
+ TypecheckedCoreBind,
zonkTopBinds, zonkForeignExports, zonkRules, mkHsLet,
zonkExpr, zonkIdBndr
)
+import Rename ( RnResult(..) )
import MkIface ( pprModDetails )
import TcExpr ( tcMonoExpr )
import TcMonad
-import TcMType ( unifyTauTy, newTyVarTy, zonkTcType, tcInstType )
+import TcMType ( newTyVarTy, zonkTcType )
import TcType ( Type, liftedTypeKind, openTypeKind,
- tyVarsOfType, tidyType, tcFunResultTy,
- mkForAllTys, mkFunTys, mkTyConApp, tcSplitForAllTys
+ tyVarsOfType, tcFunResultTy,
+ mkForAllTys, mkFunTys, mkTyConApp, tcSplitForAllTys,
+ tcSplitTyConApp_maybe, isUnitTy
)
import TcMatches ( tcStmtsAndThen )
-import Inst ( emptyLIE, plusLIE )
+import Inst ( LIE, emptyLIE, plusLIE )
import TcBinds ( tcTopBinds )
import TcClassDcl ( tcClassDecls2 )
import TcDefaults ( tcDefaults, defaultDefaultTys )
-import TcEnv ( TcEnv, RecTcEnv, InstInfo(iDFunId), tcExtendGlobalValEnv, tcLookup_maybe,
+import TcEnv ( TcEnv, RecTcEnv, InstInfo(iDFunId), tcExtendGlobalValEnv,
isLocalThing, tcSetEnv, tcSetInstEnv, initTcEnv, getTcGEnv,
- tcExtendGlobalTypeEnv, tcLookupGlobalId, tcLookupTyCon,
- TcTyThing(..), tcLookupId
+ tcExtendGlobalEnv, tcExtendGlobalTypeEnv,
+ tcLookupGlobalId, tcLookupTyCon,
+ TyThing(..), tcLookupId
)
import TcRules ( tcIfaceRules, tcSourceRules )
import TcForeign ( tcForeignImports, tcForeignExports )
-import TcIfaceSig ( tcInterfaceSigs )
-import TcInstDcls ( tcInstDecls1, tcInstDecls2 )
+import TcIfaceSig ( tcInterfaceSigs, tcCoreBinds )
+import TcInstDcls ( tcInstDecls1, tcIfaceInstDecls1, addInstDFuns, initInstEnv, tcInstDecls2 )
import TcSimplify ( tcSimplifyTop, tcSimplifyInfer )
import TcTyClsDecls ( tcTyAndClassDecls )
-import CoreUnfold ( unfoldingTemplate, hasUnfolding )
+import CoreUnfold ( unfoldingTemplate )
import TysWiredIn ( mkListTy, unitTy )
import ErrUtils ( printErrorsAndWarnings, errorsFound,
dumpIfSet_dyn, dumpIfSet_dyn_or, showPass )
-import Id ( Id, idType, idUnfolding )
-import Module ( Module, moduleName )
-import Name ( Name )
-import NameEnv ( lookupNameEnv )
+import Rules ( extendRuleBase )
+import Id ( Id, mkLocalId, idType, idUnfolding, setIdLocalExported )
+import Module ( Module )
+import Name ( Name, getName, getSrcLoc )
import TyCon ( tyConGenInfo )
-import BasicTypes ( EP(..), Fixity, RecFlag(..) )
+import BasicTypes ( EP(..), RecFlag(..) )
import SrcLoc ( noSrcLoc )
import Outputable
import IO ( stdout )
PackageTypeEnv, ModIface(..),
ModDetails(..), DFunId,
TypeEnv, extendTypeEnvList, typeEnvTyCons, typeEnvElts,
- TyThing(..),
mkTypeEnv
)
+import List ( partition )
\end{code}
tcSetDefaultTys defaultDefaultTys $
-- Typecheck the extra declarations
- fixTc (\ ~(unf_env, _, _, _, _) ->
- tcImports unf_env pcs hst get_fixity this_mod iface_decls
- ) `thenTc` \ (env, new_pcs, local_inst_info, deriv_binds, local_rules) ->
- ASSERT( null local_inst_info && nullBinds deriv_binds && null local_rules )
+ tcExtraDecls pcs hst this_mod iface_decls `thenTc` \ (new_pcs, env) ->
tcSetEnv env $
tcExtendGlobalTypeEnv ic_type_env $
ioToTc (dumpIfSet_dyn dflags Opt_D_dump_tc "Typechecked" (ppr zonked_expr)) `thenNF_Tc_`
returnTc (new_pcs, zonked_expr, zonked_ids, error "typecheckStmt: no type")
-
- where
- get_fixity :: Name -> Maybe Fixity
- get_fixity n = pprPanic "typecheckStmt" (ppr n)
\end{code}
Here is the grand plan, implemented in tcUserStmt
tc_stmts names stmts
- = tcLookupGlobalId returnIOName `thenNF_Tc` \ return_id ->
- tcLookupGlobalId bindIOName `thenNF_Tc` \ bind_id ->
- tcLookupGlobalId failIOName `thenNF_Tc` \ fail_id ->
+ = mapNF_Tc tcLookupGlobalId
+ [returnIOName, failIOName, bindIOName, thenIOName] `thenNF_Tc` \ io_ids ->
tcLookupTyCon ioTyConName `thenNF_Tc` \ ioTyCon ->
newTyVarTy liftedTypeKind `thenNF_Tc` \ res_ty ->
let
+ return_id = head io_ids -- Rather gruesome
+
io_ty = (\ ty -> mkTyConApp ioTyCon [ty], res_ty)
-- mk_return builds the expression
traceTc (text "tcs 4") `thenNF_Tc_`
returnTc (mkHsLet const_binds $
- HsDoOut DoExpr tc_stmts return_id bind_id fail_id
+ HsDoOut DoExpr tc_stmts io_ids
(mkTyConApp ioTyCon [mkListTy unitTy]) noSrcLoc,
ids)
where
tcSetDefaultTys defaultDefaultTys $
-- Typecheck the extra declarations
- fixTc (\ ~(unf_env, _, _, _, _) ->
- tcImports unf_env pcs hst get_fixity this_mod decls
- ) `thenTc` \ (env, new_pcs, local_inst_info, deriv_binds, local_rules) ->
- ASSERT( null local_inst_info && nullBinds deriv_binds && null local_rules )
+ tcExtraDecls pcs hst this_mod decls `thenTc` \ (new_pcs, env) ->
-- Now typecheck the expression
tcSetEnv env $
returnTc (new_pcs, zonked_expr, [], zonked_ty)
where
- get_fixity :: Name -> Maybe Fixity
- get_fixity n = pprPanic "typecheckExpr" (ppr n)
-
smpl_doc = ptext SLIT("main expression")
\end{code}
-> [RenamedHsDecl] -- extra decls sucked in from interface files
-> IO (Maybe PersistentCompilerState)
-typecheckExtraDecls dflags pcs hst unqual this_mod decls
+typecheckExtraDecls dflags pcs hst unqual this_mod decls
= typecheck dflags pcs hst unqual $
- fixTc (\ ~(unf_env, _, _, _, _) ->
- tcImports unf_env pcs hst get_fixity this_mod decls
- ) `thenTc` \ (env, new_pcs, local_inst_info, deriv_binds, local_rules) ->
- ASSERT( null local_inst_info && nullBinds deriv_binds && null local_rules )
- returnTc new_pcs
- where
- get_fixity n = pprPanic "typecheckExpr" (ppr n)
+ tcExtraDecls pcs hst this_mod decls `thenTc` \ (new_pcs, _) ->
+ returnTc new_pcs
+
+tcExtraDecls :: PersistentCompilerState
+ -> HomeSymbolTable
+ -> Module
+ -> [RenamedHsDecl]
+ -> TcM (PersistentCompilerState, TcEnv)
+ -- Returned environment includes instances
+
+tcExtraDecls pcs hst this_mod decls
+ = tcIfaceImports this_mod decls `thenTc` \ (env, all_things, dfuns, rules) ->
+ addInstDFuns (pcs_insts pcs) dfuns `thenNF_Tc` \ new_pcs_insts ->
+ let
+ new_pcs_pte = extendTypeEnvList (pcs_PTE pcs) all_things
+ new_pcs_rules = addIfaceRules (pcs_rules pcs) rules
+
+ new_pcs :: PersistentCompilerState
+ new_pcs = pcs { pcs_PTE = new_pcs_pte,
+ pcs_insts = new_pcs_insts,
+ pcs_rules = new_pcs_rules
+ }
+ in
+ -- Initialise the instance environment
+ tcSetEnv env (
+ initInstEnv new_pcs hst `thenNF_Tc` \ inst_env ->
+ tcSetInstEnv inst_env tcGetEnv
+ ) `thenNF_Tc` \ new_env ->
+ returnTc (new_pcs, new_env)
\end{code}
+
%************************************************************************
%* *
\subsection{Typechecking a module}
:: DynFlags
-> PersistentCompilerState
-> HomeSymbolTable
- -> ModIface -- Iface for this module
-> PrintUnqualified -- For error printing
- -> [RenamedHsDecl]
+ -> RnResult
-> IO (Maybe (PersistentCompilerState, TcResults))
-- The new PCS is Augmented with imported information,
-- (but not stuff from this module)
}
-typecheckModule dflags pcs hst mod_iface unqual decls
+typecheckModule dflags pcs hst unqual rn_result
= do { maybe_tc_result <- typecheck dflags pcs hst unqual $
- tcModule pcs hst get_fixity this_mod decls
+ tcModule pcs hst rn_result
; printTcDump dflags unqual maybe_tc_result
; return maybe_tc_result }
- where
- this_mod = mi_module mod_iface
- fixity_env = mi_fixities mod_iface
-
- get_fixity :: Name -> Maybe Fixity
- get_fixity nm = lookupNameEnv fixity_env nm
-
tcModule :: PersistentCompilerState
-> HomeSymbolTable
- -> (Name -> Maybe Fixity)
- -> Module
- -> [RenamedHsDecl]
+ -> RnResult
-> TcM (PersistentCompilerState, TcResults)
-tcModule pcs hst get_fixity this_mod decls
+tcModule pcs hst (RnResult { rr_decls = decls, rr_mod = this_mod,
+ rr_fixities = fix_env, rr_main = maybe_main_name })
= fixTc (\ ~(unf_env, _, _) ->
-- Loop back the final environment, including the fully zonked
-- versions of bindings from this module. In the presence of mutual
-- in this module, which is why the knot is so big
-- Type-check the type and class decls, and all imported decls
- tcImports unf_env pcs hst get_fixity this_mod decls
- `thenTc` \ (env, new_pcs, local_insts, deriv_binds, local_rules) ->
+ tcImports unf_env pcs hst this_mod
+ tycl_decls iface_inst_decls iface_rule_decls `thenTc` \ (env1, new_pcs) ->
+
+ tcSetEnv env1 $
- tcSetEnv env $
+ -- Do the source-language instances, including derivings
+ initInstEnv new_pcs hst `thenNF_Tc` \ inst_env1 ->
+ tcInstDecls1 (pcs_PRS new_pcs) inst_env1
+ fix_env this_mod
+ tycl_decls src_inst_decls `thenTc` \ (inst_env2, inst_info, deriv_binds) ->
+ tcSetInstEnv inst_env2 $
-- Foreign import declarations next
traceTc (text "Tc4") `thenNF_Tc_`
-- We also typecheck any extra binds that came out of the "deriving" process
traceTc (text "Default types" <+> ppr defaulting_tys) `thenNF_Tc_`
traceTc (text "Tc5") `thenNF_Tc_`
- tcTopBinds (val_binds `ThenBinds` deriv_binds) `thenTc` \ ((val_binds, env), lie_valdecls) ->
+ tcTopBinds (val_binds `ThenBinds` deriv_binds) `thenTc` \ ((val_binds, env2), lie_valdecls) ->
-- Second pass over class and instance declarations,
-- plus rules and foreign exports, to generate bindings
- tcSetEnv env $
- tcInstDecls2 local_insts `thenNF_Tc` \ (lie_instdecls, inst_binds) ->
- tcClassDecls2 this_mod tycl_decls `thenNF_Tc` \ (lie_clasdecls, cls_dm_binds) ->
- tcForeignExports decls `thenTc` \ (lie_fodecls, foe_binds, foe_decls) ->
- tcSourceRules source_rules `thenNF_Tc` \ (lie_rules, more_local_rules) ->
+ tcSetEnv env2 $
+ traceTc (text "Tc6") `thenNF_Tc_`
+ traceTc (ppr (getTcGEnv env2)) `thenNF_Tc_`
+ tcClassDecls2 this_mod tycl_decls `thenNF_Tc` \ (lie_clasdecls, cls_dm_binds, dm_ids) ->
+ tcExtendGlobalValEnv dm_ids $
+ traceTc (text "Tc7") `thenNF_Tc_`
+ tcInstDecls2 inst_info `thenNF_Tc` \ (lie_instdecls, inst_binds) ->
+ traceTc (text "Tc8") `thenNF_Tc_`
+ tcForeignExports this_mod decls `thenTc` \ (lie_fodecls, foe_binds, foe_decls) ->
+ traceTc (text "Tc9") `thenNF_Tc_`
+ tcSourceRules src_rule_decls `thenNF_Tc` \ (lie_rules, src_rules) ->
-- CHECK THAT main IS DEFINED WITH RIGHT TYPE, IF REQUIRED
- traceTc (text "Tc6") `thenNF_Tc_`
- tcCheckMain this_mod `thenTc_`
+ traceTc (text "Tc10") `thenNF_Tc_`
+ tcCheckMain maybe_main_name `thenTc` \ (main_bind, lie_main) ->
-- Deal with constant or ambiguous InstIds. How could
-- there be ambiguous ones? They can only arise if a
lie_instdecls `plusLIE`
lie_clasdecls `plusLIE`
lie_fodecls `plusLIE`
- lie_rules
+ lie_rules `plusLIE`
+ lie_main
in
- tcSimplifyTop lie_alldecls `thenTc` \ const_inst_binds ->
- traceTc (text "endsimpltop") `thenTc_`
+ tcSimplifyTop lie_alldecls `thenTc` \ const_inst_binds ->
+ traceTc (text "endsimpltop") `thenTc_`
+
-- Backsubstitution. This must be done last.
-- Even tcSimplifyTop may do some unification.
let
- all_binds = val_binds `AndMonoBinds`
- inst_binds `AndMonoBinds`
- cls_dm_binds `AndMonoBinds`
- const_inst_binds `AndMonoBinds`
- foe_binds
+ all_binds = val_binds `AndMonoBinds`
+ inst_binds `AndMonoBinds`
+ cls_dm_binds `AndMonoBinds`
+ const_inst_binds `AndMonoBinds`
+ foe_binds `AndMonoBinds`
+ main_bind
in
traceTc (text "Tc7") `thenNF_Tc_`
zonkTopBinds all_binds `thenNF_Tc` \ (all_binds', final_env) ->
traceTc (text "Tc8") `thenNF_Tc_`
zonkForeignExports foe_decls `thenNF_Tc` \ foe_decls' ->
traceTc (text "Tc9") `thenNF_Tc_`
- zonkRules more_local_rules `thenNF_Tc` \ more_local_rules' ->
-
+ zonkRules src_rules `thenNF_Tc` \ src_rules' ->
- let local_things = filter (isLocalThing this_mod) (typeEnvElts (getTcGEnv final_env))
- local_type_env :: TypeEnv
- local_type_env = mkTypeEnv local_things
-
- all_local_rules = local_rules ++ more_local_rules'
+ let src_things = filter (isLocalThing this_mod) (typeEnvElts (getTcGEnv final_env))
+ -- This is horribly crude; the env might be jolly big
in
traceTc (text "Tc10") `thenNF_Tc_`
returnTc (final_env,
new_pcs,
- TcResults { tc_env = local_type_env,
- tc_insts = map iDFunId local_insts,
+ TcResults { tc_env = mkTypeEnv src_things,
+ tc_insts = map iDFunId inst_info,
tc_binds = all_binds',
tc_fords = foi_decls ++ foe_decls',
- tc_rules = all_local_rules
+ tc_rules = src_rules'
}
)
) `thenTc` \ (_, pcs, tc_result) ->
returnTc (pcs, tc_result)
where
- tycl_decls = [d | TyClD d <- decls]
- val_binds = foldr ThenBinds EmptyBinds [binds | ValD binds <- decls]
- source_rules = [d | RuleD d <- decls, not (isIfaceRuleDecl d)]
+ tycl_decls = [d | TyClD d <- decls]
+ rule_decls = [d | RuleD d <- decls]
+ inst_decls = [d | InstD d <- decls]
+ val_decls = [d | ValD d <- decls]
+
+ core_binds = [d | d <- tycl_decls, isCoreDecl d]
+
+ (src_inst_decls, iface_inst_decls) = partition isSourceInstDecl inst_decls
+ (src_rule_decls, iface_rule_decls) = partition (isSourceRuleDecl this_mod) rule_decls
+ val_binds = foldr ThenBinds EmptyBinds val_decls
\end{code}
typecheckIface dflags pcs hst mod_iface decls
= do { maybe_tc_stuff <- typecheck dflags pcs hst alwaysQualify $
- tcIfaceImports pcs hst get_fixity this_mod decls
+ tcIface pcs this_mod decls
; printIfaceDump dflags maybe_tc_stuff
; return maybe_tc_stuff }
where
- this_mod = mi_module mod_iface
- fixity_env = mi_fixities mod_iface
-
- get_fixity :: Name -> Maybe Fixity
- get_fixity nm = lookupNameEnv fixity_env nm
-
- tcIfaceImports pcs hst get_fixity this_mod decls
- = fixTc (\ ~(unf_env, _, _, _, _) ->
- tcImports unf_env pcs hst get_fixity this_mod decls
- ) `thenTc` \ (env, new_pcs, local_inst_info,
- deriv_binds, local_rules) ->
- ASSERT(nullBinds deriv_binds)
- let
- local_things = filter (isLocalThing this_mod) (typeEnvElts (getTcGEnv env))
-
- mod_details = ModDetails { md_types = mkTypeEnv local_things,
- md_insts = map iDFunId local_inst_info,
- md_rules = [(id,rule) | IfaceRuleOut id rule <- local_rules],
- md_binds = [] }
+ this_mod = mi_module mod_iface
+
+tcIface pcs this_mod decls
+-- The decls are coming from this_mod's interface file, together
+-- with imported interface decls that belong in the "package" stuff.
+-- (With GHCi, all the home modules have already been processed.)
+-- That is why we need to do the partitioning below.
+ = tcIfaceImports this_mod decls `thenTc` \ (_, all_things, dfuns, rules) ->
+
+ let
+ -- Do the partitioning (see notes above)
+ (local_things, imported_things) = partition (isLocalThing this_mod) all_things
+ (local_rules, imported_rules) = partition is_local_rule rules
+ (local_dfuns, imported_dfuns) = partition (isLocalThing this_mod) dfuns
+ is_local_rule (IfaceRuleOut n _) = isLocalThing this_mod n
+ in
+ addInstDFuns (pcs_insts pcs) imported_dfuns `thenNF_Tc` \ new_pcs_insts ->
+ let
+ new_pcs_pte :: PackageTypeEnv
+ new_pcs_pte = extendTypeEnvList (pcs_PTE pcs) imported_things
+ new_pcs_rules = addIfaceRules (pcs_rules pcs) imported_rules
+
+ new_pcs :: PersistentCompilerState
+ new_pcs = pcs { pcs_PTE = new_pcs_pte,
+ pcs_insts = new_pcs_insts,
+ pcs_rules = new_pcs_rules
+ }
+
+ mod_details = ModDetails { md_types = mkTypeEnv local_things,
+ md_insts = local_dfuns,
+ md_rules = [(id,rule) | IfaceRuleOut id rule <- local_rules],
+ md_binds = [] }
-- All the rules from an interface are of the IfaceRuleOut form
- in
- returnTc (new_pcs, mod_details)
+ in
+ returnTc (new_pcs, mod_details)
+
+
+tcIfaceImports :: Module
+ -> [RenamedHsDecl] -- All interface-file decls
+ -> TcM (TcEnv, [TyThing], [DFunId], [TypecheckedRuleDecl])
+tcIfaceImports this_mod decls
+-- The decls are all interface-file declarations
+ = let
+ inst_decls = [d | InstD d <- decls]
+ tycl_decls = [d | TyClD d <- decls]
+ rule_decls = [d | RuleD d <- decls]
+ in
+ fixTc (\ ~(unf_env, _, _, _) ->
+ -- This fixTc follows the same general plan as tcImports,
+ -- which is better commented (below)
+ tcTyAndClassDecls this_mod tycl_decls `thenTc` \ tycl_things ->
+ tcExtendGlobalEnv tycl_things $
+ tcInterfaceSigs unf_env this_mod tycl_decls `thenTc` \ sig_ids ->
+ tcExtendGlobalValEnv sig_ids $
+ tcIfaceInstDecls1 inst_decls `thenTc` \ dfuns ->
+ tcIfaceRules rule_decls `thenTc` \ rules ->
+ tcGetEnv `thenTc` \ env ->
+ let
+ all_things = map AnId sig_ids ++ tycl_things
+ in
+ returnTc (env, all_things, dfuns, rules)
+ )
+
tcImports :: RecTcEnv
-> PersistentCompilerState
-> HomeSymbolTable
- -> (Name -> Maybe Fixity)
-> Module
- -> [RenamedHsDecl]
- -> TcM (TcEnv, PersistentCompilerState, [InstInfo],
- RenamedHsBinds, [TypecheckedRuleDecl])
+ -> [RenamedTyClDecl]
+ -> [RenamedInstDecl]
+ -> [RenamedRuleDecl]
+ -> TcM (TcEnv, PersistentCompilerState)
-- tcImports is a slight mis-nomer.
-- It deals with everything that could be an import:
--- type and class decls
+-- type and class decls (some source, some imported)
-- interface signatures (checked lazily)
--- instance decls
--- rule decls
+-- instance decls (some source, some imported)
+-- rule decls (all imported)
-- These can occur in source code too, of course
+--
+-- tcImports is only called when processing source code,
+-- so that any interface-file declarations are for other modules, not this one
-tcImports unf_env pcs hst get_fixity this_mod decls
+tcImports unf_env pcs hst this_mod
+ tycl_decls inst_decls rule_decls
-- (unf_env :: RecTcEnv) is used for type-checking interface pragmas
-- which is done lazily [ie failure just drops the pragma
-- without having any global-failure effect].
-- tcImports recovers internally, but if anything gave rise to
-- an error we'd better stop now, to avoid a cascade
- traceTc (text "Tc1") `thenNF_Tc_`
- tcTyAndClassDecls unf_env this_mod tycl_decls `thenTc` \ env ->
- tcSetEnv env $
-
- -- Typecheck the instance decls, includes deriving
- traceTc (text "Tc2") `thenNF_Tc_`
- tcInstDecls1 (pcs_insts pcs) (pcs_PRS pcs)
- hst unf_env get_fixity this_mod
- decls `thenTc` \ (new_pcs_insts, inst_env, local_insts, deriv_binds) ->
- tcSetInstEnv inst_env $
+ traceTc (text "Tc1") `thenNF_Tc_`
+ tcTyAndClassDecls this_mod tycl_decls `thenTc` \ tycl_things ->
+ tcExtendGlobalEnv tycl_things $
- -- Interface type signatures
- -- We tie a knot so that the Ids read out of interfaces are in scope
- -- when we read their pragmas.
- -- What we rely on is that pragmas are typechecked lazily; if
- -- any type errors are found (ie there's an inconsistency)
- -- we silently discard the pragma
- traceTc (text "Tc3") `thenNF_Tc_`
+ -- Interface type signatures
+ -- We tie a knot so that the Ids read out of interfaces are in scope
+ -- when we read their pragmas.
+ -- What we rely on is that pragmas are typechecked lazily; if
+ -- any type errors are found (ie there's an inconsistency)
+ -- we silently discard the pragma
+ traceTc (text "Tc2") `thenNF_Tc_`
tcInterfaceSigs unf_env this_mod tycl_decls `thenTc` \ sig_ids ->
tcExtendGlobalValEnv sig_ids $
+ -- Typecheck the instance decls, includes deriving
+ -- Note that imported dictionary functions are already
+ -- in scope from the preceding tcInterfaceSigs
+ traceTc (text "Tc3") `thenNF_Tc_`
+ tcIfaceInstDecls1 inst_decls `thenTc` \ dfuns ->
+ tcIfaceRules rule_decls `thenNF_Tc` \ rules ->
- tcIfaceRules unf_env (pcs_rules pcs) this_mod iface_rules `thenNF_Tc` \ (new_pcs_rules, local_rules) ->
- -- When relinking this module from its interface-file decls
- -- we'll have IfaceRules that are in fact local to this module
- -- That's the reason we we get any local_rules out here
-
- tcGetEnv `thenTc` \ unf_env ->
+ addInstDFuns (pcs_insts pcs) dfuns `thenNF_Tc` \ new_pcs_insts ->
+ tcGetEnv `thenTc` \ unf_env ->
let
- all_things = typeEnvElts (getTcGEnv unf_env)
-
-- sometimes we're compiling in the context of a package module
-- (on the GHCi command line, for example). In this case, we
-- want to treat everything we pulled in as an imported thing.
- imported_things
- = filter (not . isLocalThing this_mod) all_things
+ imported_things = map AnId sig_ids ++ -- All imported
+ filter (not . isLocalThing this_mod) tycl_things
new_pte :: PackageTypeEnv
new_pte = extendTypeEnvList (pcs_PTE pcs) imported_things
+ new_pcs_rules = addIfaceRules (pcs_rules pcs) rules
+
new_pcs :: PersistentCompilerState
new_pcs = pcs { pcs_PTE = new_pte,
pcs_insts = new_pcs_insts,
pcs_rules = new_pcs_rules
}
in
- returnTc (unf_env, new_pcs, local_insts, deriv_binds, local_rules)
+ returnTc (unf_env, new_pcs)
+
+isSourceRuleDecl :: Module -> RenamedRuleDecl -> Bool
+-- This is a bit gruesome.
+-- Usually, HsRules come only from source files; IfaceRules only from interface files
+-- But built-in rules appear as an IfaceRuleOut... and when compiling
+-- the source file for that built-in rule, we want to treat it as a source
+-- rule, so it gets put with the other rules for that module.
+isSourceRuleDecl this_mod (HsRule _ _ _ _ _ _) = True
+isSourceRuleDecl this_mod (IfaceRule _ _ _ n _ _ _) = False
+isSourceRuleDecl this_mod (IfaceRuleOut name _) = isLocalThing this_mod name
+
+addIfaceRules rule_base rules
+ = foldl add_rule rule_base rules
where
- tycl_decls = [d | TyClD d <- decls]
- iface_rules = [d | RuleD d <- decls, isIfaceRuleDecl d]
+ add_rule rule_base (IfaceRuleOut id rule) = extendRuleBase rule_base (id, rule)
\end{code}
+\begin{code}
+typecheckCoreModule
+ :: DynFlags
+ -> PersistentCompilerState
+ -> HomeSymbolTable
+ -> ModIface -- Iface for this module (just module & fixities)
+ -> [RenamedHsDecl]
+ -> IO (Maybe (PersistentCompilerState, (TypeEnv, [TypecheckedCoreBind], [TypecheckedRuleDecl])))
+typecheckCoreModule dflags pcs hst mod_iface decls
+ = do { maybe_tc_stuff <- typecheck dflags pcs hst alwaysQualify $
+ tcCoreDecls this_mod decls
+
+-- ; printIfaceDump dflags maybe_tc_stuff
+
+ -- Q: Is it OK not to extend PCS here?
+ -- (in the event that it needs to be, I'm returning the PCS passed in.)
+ ; case maybe_tc_stuff of
+ Nothing -> return Nothing
+ Just result -> return (Just (pcs, result)) }
+ where
+ this_mod = mi_module mod_iface
+ core_decls = [d | (TyClD d) <- decls, isCoreDecl d]
+
+
+tcCoreDecls :: Module
+ -> [RenamedHsDecl] -- All interface-file decls
+ -> TcM (TypeEnv, [TypecheckedCoreBind], [TypecheckedRuleDecl])
+tcCoreDecls this_mod decls
+-- The decls are all TyClD declarations coming from External Core input.
+ = let
+ tycl_decls = [d | TyClD d <- decls]
+ rule_decls = [d | RuleD d <- decls]
+ core_decls = filter isCoreDecl tycl_decls
+ in
+ fixTc (\ ~(unf_env, _) ->
+ -- This fixTc follows the same general plan as tcImports,
+ -- which is better commented.
+ -- [ Q: do we need to tie a knot for External Core? ]
+ tcTyAndClassDecls this_mod tycl_decls `thenTc` \ tycl_things ->
+ tcExtendGlobalEnv tycl_things $
+
+ tcInterfaceSigs unf_env this_mod tycl_decls `thenTc` \ sig_ids ->
+ tcExtendGlobalValEnv sig_ids $
+
+ tcCoreBinds core_decls `thenTc` \ core_prs ->
+ let
+ local_ids = map fst core_prs
+ in
+ tcExtendGlobalValEnv local_ids $
+
+ tcIfaceRules rule_decls `thenTc` \ rules ->
+
+ let
+ src_things = filter (isLocalThing this_mod) tycl_things
+ ++ map AnId local_ids
+ in
+ tcGetEnv `thenNF_Tc` \ env ->
+ returnTc (env, (mkTypeEnv src_things, core_prs, rules))
+ ) `thenTc` \ (_, result) ->
+ returnTc result
+\end{code}
+
%************************************************************************
%* *
%************************************************************************
We must check that in module Main,
- a) main is defined
- b) main :: forall a1...an. IO t, for some type t
+ a) Main.main is in scope
+ b) Main.main :: forall a1...an. IO t, for some type t
-If we have
- main = error "Urk"
-then the type of main will be
- main :: forall a. a
-and that should pass the test too.
+Then we build
+ $main = PrelTopHandler.runMain Main.main
-So we just instantiate the type and unify with IO t, and declare
-victory if doing so succeeds.
+The function
+ PrelTopHandler :: IO a -> IO ()
+catches the top level exceptions.
+It accepts a Main.main of any type (IO a).
\begin{code}
-tcCheckMain :: Module -> TcM ()
-tcCheckMain this_mod
- | not (moduleName this_mod == mAIN_Name )
- = returnTc ()
-
- | otherwise
- = -- First unify the main_id with IO t, for any old t
- tcLookup_maybe mainName `thenNF_Tc` \ maybe_thing ->
- case maybe_thing of
- Just (ATcId main_id) -> check_main_ty (idType main_id)
- other -> addErrTc noMainErr
+tcCheckMain :: Maybe Name -> TcM (TypecheckedMonoBinds, LIE)
+tcCheckMain Nothing = returnTc (EmptyMonoBinds, emptyLIE)
+
+tcCheckMain (Just main_name)
+ = tcLookupId main_name `thenNF_Tc` \ main_id ->
+ -- If it is not Nothing, it should be in the env
+ tcAddSrcLoc (getSrcLoc main_id) $
+ tcAddErrCtxt mainCtxt $
+ newTyVarTy liftedTypeKind `thenNF_Tc` \ ty ->
+ tcMonoExpr rhs ty `thenTc` \ (main_expr, lie) ->
+ zonkTcType ty `thenNF_Tc` \ ty ->
+ ASSERT( is_io_unit ty )
+ let
+ dollar_main_id = setIdLocalExported (mkLocalId dollarMainName ty)
+ in
+ returnTc (VarMonoBind dollar_main_id main_expr, lie)
where
- check_main_ty main_ty
- = tcInstType main_ty `thenNF_Tc` \ (tvs, theta, main_tau) ->
- newTyVarTy liftedTypeKind `thenNF_Tc` \ arg_ty ->
- tcLookupTyCon ioTyConName `thenNF_Tc` \ ioTyCon ->
- tcAddErrCtxtM (mainTypeCtxt main_ty) $
- if not (null theta) then
- failWithTc empty -- Context has the error message
- else
- unifyTauTy main_tau (mkTyConApp ioTyCon [arg_ty])
-
-mainTypeCtxt main_ty tidy_env
- = zonkTcType main_ty `thenNF_Tc` \ main_ty' ->
- returnNF_Tc (tidy_env, ptext SLIT("`main' has the illegal type") <+>
- quotes (ppr (tidyType tidy_env main_ty')))
-
-noMainErr = hsep [ptext SLIT("Module") <+> quotes (ppr mAIN_Name),
- ptext SLIT("must include a definition for") <+> quotes (ptext SLIT("main"))]
+ rhs = HsApp (HsVar runMainName) (HsVar main_name)
+
+is_io_unit :: Type -> Bool -- True for IO ()
+is_io_unit tau = case tcSplitTyConApp_maybe tau of
+ Just (tc, [arg]) -> getName tc == ioTyConName && isUnitTy arg
+ other -> False
+
+mainCtxt = ptext SLIT("When checking the type of 'main'")
\end{code}
else return ()
dumpIfSet_dyn dflags Opt_D_dump_tc
- "Typechecked" (ppr (tc_binds results))
+ -- foreign x-d's have undefined's in their types; hence can't show the tc_fords
+ "Typechecked" (ppr (tc_binds results) {- $$ ppr (tc_fords results)-})
printIfaceDump dflags Nothing = return ()
projects / ghc-hetmet.git / blobdiff