\begin{code}
module TcModule (
- typecheckModule, typecheckExpr, TcResults(..)
+ typecheckModule, typecheckIface, typecheckStmt, typecheckExpr,
+ TcResults(..)
) where
#include "HsVersions.h"
-import CmdLineOpts ( DynFlag(..), DynFlags, opt_PprStyle_Debug )
+import CmdLineOpts ( DynFlag(..), DynFlags, dopt )
import HsSyn ( HsBinds(..), MonoBinds(..), HsDecl(..), HsExpr(..),
- isIfaceRuleDecl, nullBinds, andMonoBindList
+ Stmt(..), InPat(..), HsMatchContext(..), HsDoContext(..), RuleDecl(..),
+ isIfaceRuleDecl, nullBinds, andMonoBindList, mkSimpleMatch, placeHolderType
)
-import HsTypes ( toHsType )
-import PrelNames ( mAIN_Name, mainName, ioTyConName, printName )
-import RnHsSyn ( RenamedHsBinds, RenamedHsDecl, RenamedHsExpr )
+import PrelNames ( mAIN_Name, mainName, ioTyConName, printName,
+ returnIOName, bindIOName, failIOName,
+ itName
+ )
+import MkId ( unsafeCoerceId )
+import RnHsSyn ( RenamedHsBinds, RenamedHsDecl, RenamedStmt,
+ RenamedHsExpr )
import TcHsSyn ( TypecheckedMonoBinds, TypecheckedHsExpr,
TypecheckedForeignDecl, TypecheckedRuleDecl,
zonkTopBinds, zonkForeignExports, zonkRules, mkHsLet,
- zonkExpr
+ zonkExpr, zonkIdBndr
)
-
+import MkIface ( pprModDetails )
+import TcExpr ( tcMonoExpr )
import TcMonad
-import TcType ( newTyVarTy, zonkTcType, tcInstType )
-import TcUnify ( unifyTauTy )
-import Inst ( plusLIE )
-import VarSet ( varSetElems )
+import TcMType ( unifyTauTy, newTyVarTy, zonkTcType, tcInstType )
+import TcType ( Type, liftedTypeKind, openTypeKind,
+ tyVarsOfType, tidyType, tcFunResultTy,
+ mkForAllTys, mkFunTys, mkTyConApp, tcSplitForAllTys
+ )
+import TcMatches ( tcStmtsAndThen )
+import Inst ( emptyLIE, plusLIE )
import TcBinds ( tcTopBinds )
import TcClassDcl ( tcClassDecls2 )
import TcDefaults ( tcDefaults, defaultDefaultTys )
-import TcExpr ( tcMonoExpr )
-import TcEnv ( TcEnv, InstInfo, tcExtendGlobalValEnv, tcLookup_maybe,
+import TcEnv ( TcEnv, RecTcEnv, InstInfo(iDFunId), tcExtendGlobalValEnv, tcLookup_maybe,
isLocalThing, tcSetEnv, tcSetInstEnv, initTcEnv, getTcGEnv,
- TcTyThing(..), tcLookupTyCon
+ tcExtendGlobalTypeEnv, tcLookupGlobalId, tcLookupTyCon,
+ TcTyThing(..), tcLookupId
)
import TcRules ( tcIfaceRules, tcSourceRules )
import TcForeign ( tcForeignImports, tcForeignExports )
import TcInstDcls ( tcInstDecls1, tcInstDecls2 )
import TcSimplify ( tcSimplifyTop, tcSimplifyInfer )
import TcTyClsDecls ( tcTyAndClassDecls )
-
import CoreUnfold ( unfoldingTemplate, hasUnfolding )
-import Type ( funResultTy, splitForAllTys, mkForAllTys, mkFunTys,
- liftedTypeKind, openTypeKind, mkTyConApp, tyVarsOfType, tidyType )
-import ErrUtils ( printErrorsAndWarnings, errorsFound, dumpIfSet_dyn, showPass )
-import Id ( idType, idName, isLocalId, idUnfolding )
-import Module ( Module, isHomeModule, moduleName )
-import Name ( Name, toRdrName, isGlobalName )
-import Name ( nameEnvElts, lookupNameEnv )
+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 ( nameEnvElts, lookupNameEnv )
import TyCon ( tyConGenInfo )
-import Util
-import BasicTypes ( EP(..), Fixity )
+import BasicTypes ( EP(..), Fixity, RecFlag(..) )
+import SrcLoc ( noSrcLoc )
import Outputable
+import IO ( stdout )
import HscTypes ( PersistentCompilerState(..), HomeSymbolTable,
PackageTypeEnv, ModIface(..),
+ ModDetails(..), DFunId,
TypeEnv, extendTypeEnvList,
TyThing(..), implicitTyThingIds,
mkTypeEnv
)
\end{code}
-Outside-world interface:
+
+%************************************************************************
+%* *
+\subsection{The stmt interface}
+%* *
+%************************************************************************
+
\begin{code}
+typecheckStmt
+ :: DynFlags
+ -> PersistentCompilerState
+ -> HomeSymbolTable
+ -> TypeEnv -- The interactive context's type envt
+ -> PrintUnqualified -- For error printing
+ -> Module -- Is this really needed
+ -> [Name] -- Names bound by the Stmt (empty for expressions)
+ -> (RenamedStmt, -- The stmt itself
+ [RenamedHsDecl]) -- Plus extra decls it sucked in from interface files
+ -> IO (Maybe (PersistentCompilerState,
+ TypecheckedHsExpr,
+ [Id],
+ Type))
+ -- The returned [Id] is the same as the input except for
+ -- ExprStmt, in which case the returned [Name] is [itName]
+
+typecheckStmt dflags pcs hst ic_type_env unqual this_mod names (stmt, iface_decls)
+ = typecheck dflags pcs hst unqual $
--- Convenient type synonyms first:
-data TcResults
- = TcResults {
- -- All these fields have info *just for this module*
- tc_env :: TypeEnv, -- The top level TypeEnv
- tc_binds :: TypecheckedMonoBinds, -- Bindings
- tc_fords :: [TypecheckedForeignDecl], -- Foreign import & exports.
- tc_rules :: [TypecheckedRuleDecl] -- Transformation rules
- }
+ -- use the default default settings, i.e. [Integer, Double]
+ tcSetDefaultTys defaultDefaultTys $
----------------
-typecheckModule
- :: DynFlags
- -> PersistentCompilerState
- -> HomeSymbolTable
- -> ModIface -- Iface for this module
- -> PrintUnqualified -- For error printing
- -> [RenamedHsDecl]
- -> IO (Maybe (PersistentCompilerState, TcResults))
- -- The new PCS is Augmented with imported information,
- -- (but not stuff from this module)
+ -- 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 )
+ tcSetEnv env $
+ tcExtendGlobalTypeEnv ic_type_env $
-typecheckModule dflags pcs hst mod_iface unqual decls
- = do { maybe_tc_result <- typecheck dflags pcs hst unqual $
- tcModule pcs hst get_fixity this_mod decls
- ; printTcDump dflags maybe_tc_result
- ; return maybe_tc_result }
- where
- this_mod = mi_module mod_iface
- fixity_env = mi_fixities mod_iface
+ -- The real work is done here
+ tcUserStmt names stmt `thenTc` \ (expr, bound_ids) ->
+
+ traceTc (text "tcs 1") `thenNF_Tc_`
+ zonkExpr expr `thenNF_Tc` \ zonked_expr ->
+ mapNF_Tc zonkIdBndr bound_ids `thenNF_Tc` \ zonked_ids ->
+ ioToTc (dumpIfSet_dyn dflags Opt_D_dump_tc "Bound Ids" (vcat (map ppr zonked_ids))) `thenNF_Tc_`
+ 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 nm = lookupNameEnv fixity_env nm
+ get_fixity n = pprPanic "typecheckStmt" (ppr n)
+\end{code}
+
+Here is the grand plan, implemented in tcUserStmt
+
+ What you type The IO [HValue] that hscStmt returns
+ ------------- ------------------------------------
+ let pat = expr ==> let pat = expr in return [coerce HVal x, coerce HVal y, ...]
+ bindings: [x,y,...]
+
+ pat <- expr ==> expr >>= \ pat -> return [coerce HVal x, coerce HVal y, ...]
+ bindings: [x,y,...]
+
+ expr (of IO type) ==> expr >>= \ v -> return [v]
+ [NB: result not printed] bindings: [it]
+
+
+ expr (of non-IO type,
+ result showable) ==> let v = expr in print v >> return [v]
+ bindings: [it]
+
+ expr (of non-IO type,
+ result not showable) ==> error
+
+
+\begin{code}
+tcUserStmt :: [Name] -> RenamedStmt -> TcM (TypecheckedHsExpr, [Id])
+
+tcUserStmt names (ExprStmt expr _ loc)
+ = ASSERT( null names )
+ tcGetUnique `thenNF_Tc` \ uniq ->
+ let
+ fresh_it = itName uniq
+ the_bind = FunMonoBind fresh_it False
+ [ mkSimpleMatch [] expr placeHolderType loc ] loc
+ in
+ tryTc_ (traceTc (text "tcs 1b") `thenNF_Tc_`
+ tc_stmts [fresh_it] [
+ LetStmt (MonoBind the_bind [] NonRecursive),
+ ExprStmt (HsApp (HsVar printName) (HsVar fresh_it)) placeHolderType loc])
+ ( traceTc (text "tcs 1a") `thenNF_Tc_`
+ tc_stmts [fresh_it] [BindStmt (VarPatIn fresh_it) expr loc])
+
+tcUserStmt names stmt
+ = tc_stmts names [stmt]
+
+
+tc_stmts names stmts
+ = tcLookupGlobalId returnIOName `thenNF_Tc` \ return_id ->
+ tcLookupGlobalId bindIOName `thenNF_Tc` \ bind_id ->
+ tcLookupGlobalId failIOName `thenNF_Tc` \ fail_id ->
+ tcLookupTyCon ioTyConName `thenNF_Tc` \ ioTyCon ->
+ newTyVarTy liftedTypeKind `thenNF_Tc` \ res_ty ->
+ let
+ io_ty = (\ ty -> mkTyConApp ioTyCon [ty], res_ty)
+
+ -- mk_return builds the expression
+ -- returnIO @ [()] [coerce () x, .., coerce () z]
+ mk_return ids = HsApp (TyApp (HsVar return_id) [mkListTy unitTy])
+ (ExplicitList unitTy (map mk_item ids))
+
+ mk_item id = HsApp (TyApp (HsVar unsafeCoerceId) [idType id, unitTy])
+ (HsVar id)
+ in
+
+ traceTc (text "tcs 2") `thenNF_Tc_`
+ tcStmtsAndThen combine (DoCtxt DoExpr) io_ty stmts (
+ -- Look up the names right in the middle,
+ -- where they will all be in scope
+ mapNF_Tc tcLookupId names `thenNF_Tc` \ ids ->
+ returnTc ((ids, [ResultStmt (mk_return ids) noSrcLoc]), emptyLIE)
+ ) `thenTc` \ ((ids, tc_stmts), lie) ->
+
+ -- Simplify the context right here, so that we fail
+ -- if there aren't enough instances. Notably, when we see
+ -- e
+ -- we use tryTc_ to try it <- e
+ -- and then let it = e
+ -- It's the simplify step that rejects the first.
+
+ traceTc (text "tcs 3") `thenNF_Tc_`
+ tcSimplifyTop lie `thenTc` \ const_binds ->
+ traceTc (text "tcs 4") `thenNF_Tc_`
+
+ returnTc (mkHsLet const_binds $
+ HsDoOut DoExpr tc_stmts return_id bind_id fail_id
+ (mkTyConApp ioTyCon [mkListTy unitTy]) noSrcLoc,
+ ids)
+ where
+ combine stmt (ids, stmts) = (ids, stmt:stmts)
+\end{code}
----------------
+%************************************************************************
+%* *
+\subsection{Typechecking an expression}
+%* *
+%************************************************************************
+
+\begin{code}
typecheckExpr :: DynFlags
- -> Bool -- True <=> wrap in 'print' to get a result of IO type
-> PersistentCompilerState
-> HomeSymbolTable
+ -> TypeEnv -- The interactive context's type envt
-> PrintUnqualified -- For error printing
-> Module
-> (RenamedHsExpr, -- The expression itself
[RenamedHsDecl]) -- Plus extra decls it sucked in from interface files
- -> IO (Maybe (PersistentCompilerState, TypecheckedHsExpr, TcType))
+ -> IO (Maybe (PersistentCompilerState,
+ TypecheckedHsExpr,
+ [Id], -- always empty (matches typecheckStmt)
+ Type))
-typecheckExpr dflags wrap_io pcs hst unqual this_mod (expr, decls)
+typecheckExpr dflags pcs hst ic_type_env unqual this_mod (expr, decls)
= typecheck dflags pcs hst unqual $
-- use the default default settings, i.e. [Integer, Double]
tcSetDefaultTys defaultDefaultTys $
- tcImports pcs hst get_fixity this_mod decls `thenTc` \ (env, new_pcs, local_inst_info, deriv_binds, local_rules) ->
+
+ -- 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 )
- tcSetEnv env $
- tc_expr expr `thenTc` \ (expr', lie, expr_ty) ->
- tcSimplifyInfer smpl_doc
- (varSetElems (tyVarsOfType expr_ty)) lie `thenTc` \ (qtvs, lie_free, dict_binds, dict_ids) ->
- tcSimplifyTop lie_free `thenTc` \ const_binds ->
+ -- Now typecheck the expression
+ tcSetEnv env $
+ tcExtendGlobalTypeEnv ic_type_env $
+
+ newTyVarTy openTypeKind `thenTc` \ ty ->
+ tcMonoExpr expr ty `thenTc` \ (e', lie) ->
+ tcSimplifyInfer smpl_doc (tyVarsOfType ty) lie
+ `thenTc` \ (qtvs, lie_free, dict_binds, dict_ids) ->
+ tcSimplifyTop lie_free `thenTc` \ const_binds ->
+
let all_expr = mkHsLet const_binds $
- TyLam qtvs $
- DictLam dict_ids $
- mkHsLet dict_binds $
- expr'
- all_expr_ty = mkForAllTys qtvs (mkFunTys (map idType dict_ids) expr_ty)
+ TyLam qtvs $
+ DictLam dict_ids $
+ mkHsLet dict_binds $
+ e'
+
+ all_expr_ty = mkForAllTys qtvs $
+ mkFunTys (map idType dict_ids) $
+ ty
in
- zonkExpr all_expr `thenNF_Tc` \ zonked_expr ->
- zonkTcType all_expr_ty `thenNF_Tc` \ zonked_ty ->
+
+ zonkExpr all_expr `thenNF_Tc` \ zonked_expr ->
+ zonkTcType all_expr_ty `thenNF_Tc` \ zonked_ty ->
ioToTc (dumpIfSet_dyn dflags
Opt_D_dump_tc "Typechecked" (ppr zonked_expr)) `thenNF_Tc_`
- returnTc (new_pcs, zonked_expr, zonked_ty)
+ 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}
- -- Typecheck it, wrapping in 'print' if necessary to
- -- get a result of type IO t. Returns the result type
- -- that is free in the result type
- tc_expr e
- | wrap_io = tryTc_ (tc_io_expr (HsApp (HsVar printName) e)) -- Recovery case
- (tc_io_expr e) -- Main case
- | otherwise = newTyVarTy openTypeKind `thenTc` \ ty ->
- tcMonoExpr expr ty `thenTc` \ (expr', lie) ->
- returnTc (expr', lie, ty)
-
- where
- -- (tc_io_expr e) typechecks 'e' if that gives a result of IO t,
- -- or 'print e' otherwise. Either way the result is of type IO t
- tc_io_expr e = newTyVarTy openTypeKind `thenTc` \ ty ->
- tcLookupTyCon ioTyConName `thenNF_Tc` \ ioTyCon ->
- let
- res_ty = mkTyConApp ioTyCon [ty]
- in
- tcMonoExpr expr res_ty `thenTc` \ (expr', lie) ->
- returnTc (expr', lie, res_ty)
-
----------------
-typecheck :: DynFlags
- -> PersistentCompilerState
- -> HomeSymbolTable
- -> PrintUnqualified -- For error printing
- -> TcM r
- -> IO (Maybe r)
+%************************************************************************
+%* *
+\subsection{Typechecking a module}
+%* *
+%************************************************************************
-typecheck dflags pcs hst unqual thing_inside
- = do { showPass dflags "Typechecker";
- ; env <- initTcEnv hst (pcs_PTE pcs)
+\begin{code}
+typecheckModule
+ :: DynFlags
+ -> PersistentCompilerState
+ -> HomeSymbolTable
+ -> ModIface -- Iface for this module
+ -> PrintUnqualified -- For error printing
+ -> [RenamedHsDecl]
+ -> IO (Maybe (PersistentCompilerState, TcResults))
+ -- The new PCS is Augmented with imported information,
+ -- (but not stuff from this module)
- ; (maybe_tc_result, errs) <- initTc dflags env thing_inside
+data TcResults
+ = TcResults {
+ -- All these fields have info *just for this module*
+ tc_env :: TypeEnv, -- The top level TypeEnv
+ tc_insts :: [DFunId], -- Instances
+ tc_rules :: [TypecheckedRuleDecl], -- Transformation rules
+ tc_binds :: TypecheckedMonoBinds, -- Bindings
+ tc_fords :: [TypecheckedForeignDecl] -- Foreign import & exports.
+ }
- ; printErrorsAndWarnings unqual errs
- ; if errorsFound errs then
- return Nothing
- else
- return maybe_tc_result
- }
-\end{code}
+typecheckModule dflags pcs hst mod_iface unqual decls
+ = do { maybe_tc_result <- typecheck dflags pcs hst unqual $
+ tcModule pcs hst get_fixity this_mod decls
+ ; 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
+
-The internal monster:
-\begin{code}
tcModule :: PersistentCompilerState
-> HomeSymbolTable
-> (Name -> Maybe Fixity)
-> TcM (PersistentCompilerState, TcResults)
tcModule pcs hst get_fixity this_mod decls
- = -- Type-check the type and class decls, and all imported decls
- -- tcImports recovers internally, but if anything gave rise to
- -- an error we'd better stop now, to avoid a cascade
- checkNoErrsTc (
- tcImports pcs hst get_fixity this_mod decls
- ) `thenTc` \ (env, new_pcs, local_inst_info, deriv_binds, local_rules) ->
+ = fixTc (\ ~(unf_env, _, _) ->
+ -- Loop back the final environment, including the fully zonked
+ -- versions of bindings from this module. In the presence of mutual
+ -- recursion, interface type signatures may mention variables defined
+ -- in this module, which is why the knot is so big
- tcSetEnv env $
+ -- 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) ->
+
+ tcSetEnv env $
-- Foreign import declarations next
--- traceTc (text "Tc4") `thenNF_Tc_`
- tcForeignImports decls `thenTc` \ (fo_ids, foi_decls) ->
- tcExtendGlobalValEnv fo_ids $
+ traceTc (text "Tc4") `thenNF_Tc_`
+ tcForeignImports decls `thenTc` \ (fo_ids, foi_decls) ->
+ tcExtendGlobalValEnv fo_ids $
-- Default declarations
- tcDefaults decls `thenTc` \ defaulting_tys ->
- tcSetDefaultTys defaulting_tys $
+ tcDefaults decls `thenTc` \ defaulting_tys ->
+ tcSetDefaultTys defaulting_tys $
-- Value declarations next.
-- We also typecheck any extra binds that came out of the "deriving" process
--- traceTc (text "Tc5") `thenNF_Tc_`
- tcTopBinds (val_binds `ThenBinds` deriv_binds) `thenTc` \ ((val_binds, env), lie_valdecls) ->
- tcSetEnv env $
-
- -- Foreign export declarations next
--- traceTc (text "Tc6") `thenNF_Tc_`
- tcForeignExports decls `thenTc` \ (lie_fodecls, foe_binds, foe_decls) ->
-
- -- Second pass over class and instance declarations,
- -- to compile the bindings themselves.
- tcInstDecls2 local_inst_info `thenNF_Tc` \ (lie_instdecls, inst_binds) ->
- tcClassDecls2 this_mod tycl_decls `thenNF_Tc` \ (lie_clasdecls, cls_dm_binds) ->
- tcSourceRules source_rules `thenNF_Tc` \ (lie_rules, more_local_rules) ->
-
- -- Deal with constant or ambiguous InstIds. How could
- -- there be ambiguous ones? They can only arise if a
- -- top-level decl falls under the monomorphism
- -- restriction, and no subsequent decl instantiates its
- -- type. (Usually, ambiguous type variables are resolved
- -- during the generalisation step.)
- let
- lie_alldecls = lie_valdecls `plusLIE`
- lie_instdecls `plusLIE`
- lie_clasdecls `plusLIE`
- lie_fodecls `plusLIE`
- lie_rules
- in
- tcSimplifyTop lie_alldecls `thenTc` \ const_inst_binds ->
-
- -- CHECK THAT main IS DEFINED WITH RIGHT TYPE, IF REQUIRED
- tcCheckMain this_mod `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
- in
--- traceTc (text "Tc9") `thenNF_Tc_`
- zonkTopBinds all_binds `thenNF_Tc` \ (all_binds', final_env) ->
- tcSetEnv final_env $
- -- zonkTopBinds puts all the top-level Ids into the tcGEnv
- zonkForeignExports foe_decls `thenNF_Tc` \ foe_decls' ->
- zonkRules more_local_rules `thenNF_Tc` \ more_local_rules' ->
-
-
- let local_things = filter (isLocalThing this_mod) (nameEnvElts (getTcGEnv final_env))
-
- -- Create any necessary "implicit" bindings (data constructors etc)
- -- Should we create bindings for dictionary constructors?
- -- They are always fully applied, and the bindings are just there
- -- to support partial applications. But it's easier to let them through.
- implicit_binds = andMonoBindList [ CoreMonoBind id (unfoldingTemplate unf)
- | id <- implicitTyThingIds local_things
- , let unf = idUnfolding id
- , hasUnfolding unf
- ]
-
- local_type_env :: TypeEnv
- local_type_env = mkTypeEnv local_things
-
- all_local_rules = local_rules ++ more_local_rules'
- in
--- traceTc (text "Tc10") `thenNF_Tc_`
- returnTc (new_pcs,
- TcResults { tc_env = local_type_env,
- tc_binds = implicit_binds `AndMonoBinds` all_binds',
- tc_fords = foi_decls ++ foe_decls',
- tc_rules = all_local_rules
- }
- )
+ 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) ->
+
+ -- 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) ->
+
+ -- CHECK THAT main IS DEFINED WITH RIGHT TYPE, IF REQUIRED
+ traceTc (text "Tc6") `thenNF_Tc_`
+ tcCheckMain this_mod `thenTc_`
+
+ -- Deal with constant or ambiguous InstIds. How could
+ -- there be ambiguous ones? They can only arise if a
+ -- top-level decl falls under the monomorphism
+ -- restriction, and no subsequent decl instantiates its
+ -- type. (Usually, ambiguous type variables are resolved
+ -- during the generalisation step.)
+ --
+ -- Note that we must do this *after* tcCheckMain, because of the
+ -- following bizarre case:
+ -- main = return ()
+ -- Here, we infer main :: forall a. m a, where m is a free
+ -- type variable. tcCheckMain will unify it with IO, and that
+ -- must happen before tcSimplifyTop, since the latter will report
+ -- m as ambiguous
+ let
+ lie_alldecls = lie_valdecls `plusLIE`
+ lie_instdecls `plusLIE`
+ lie_clasdecls `plusLIE`
+ lie_fodecls `plusLIE`
+ lie_rules
+ in
+ 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
+ in
+ traceTc (text "Tc7") `thenNF_Tc_`
+ zonkTopBinds all_binds `thenNF_Tc` \ (all_binds', final_env) ->
+ tcSetEnv final_env $
+ -- zonkTopBinds puts all the top-level Ids into the tcGEnv
+ 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' ->
+
+
+ let local_things = filter (isLocalThing this_mod) (nameEnvElts (getTcGEnv final_env))
+
+ -- Create any necessary "implicit" bindings (data constructors etc)
+ -- Should we create bindings for dictionary constructors?
+ -- They are always fully applied, and the bindings are just there
+ -- to support partial applications. But it's easier to let them through.
+ implicit_binds = andMonoBindList [ CoreMonoBind id (unfoldingTemplate unf)
+ | id <- implicitTyThingIds local_things
+ , let unf = idUnfolding id
+ , hasUnfolding unf
+ ]
+
+ local_type_env :: TypeEnv
+ local_type_env = mkTypeEnv local_things
+
+ all_local_rules = local_rules ++ more_local_rules'
+ in
+ traceTc (text "Tc10") `thenNF_Tc_`
+ returnTc (final_env,
+ new_pcs,
+ TcResults { tc_env = local_type_env,
+ tc_insts = map iDFunId local_insts,
+ tc_binds = implicit_binds `AndMonoBinds` all_binds',
+ tc_fords = foi_decls ++ foe_decls',
+ tc_rules = all_local_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]
\end{code}
+%************************************************************************
+%* *
+\subsection{Typechecking interface decls}
+%* *
+%************************************************************************
+
\begin{code}
-tcImports :: PersistentCompilerState
+typecheckIface
+ :: DynFlags
+ -> PersistentCompilerState
+ -> HomeSymbolTable
+ -> ModIface -- Iface for this module (just module & fixities)
+ -> [RenamedHsDecl]
+ -> IO (Maybe (PersistentCompilerState, ModDetails))
+ -- The new PCS is Augmented with imported information,
+ -- (but not stuff from this module).
+
+typecheckIface dflags pcs hst mod_iface decls
+ = do { maybe_tc_stuff <- typecheck dflags pcs hst alwaysQualify $
+ tcIfaceImports pcs hst get_fixity 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) (nameEnvElts (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 = [] }
+ -- All the rules from an interface are of the IfaceRuleOut form
+ in
+ returnTc (new_pcs, mod_details)
+
+tcImports :: RecTcEnv
+ -> PersistentCompilerState
-> HomeSymbolTable
-> (Name -> Maybe Fixity)
-> Module
-> [RenamedHsDecl]
- -> TcM (TcEnv, PersistentCompilerState,
- [InstInfo], RenamedHsBinds, [TypecheckedRuleDecl])
+ -> TcM (TcEnv, PersistentCompilerState, [InstInfo],
+ RenamedHsBinds, [TypecheckedRuleDecl])
-- tcImports is a slight mis-nomer.
--- It deals with everythign that could be an import:
+-- It deals with everything that could be an import:
-- type and class decls
--- interface signatures
+-- interface signatures (checked lazily)
-- instance decls
-- rule decls
-- These can occur in source code too, of course
-tcImports pcs hst get_fixity this_mod decls
- = fixTc (\ ~(unf_env, _, _, _, _) ->
- -- (unf_env :: RecTcEnv) is used for type-checking interface pragmas
+tcImports unf_env pcs hst get_fixity this_mod 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].
--
-- unf_env is also used to get the pragama info
-- for imported dfuns and default methods
-
--- traceTc (text "Tc1") `thenNF_Tc_`
- tcTyAndClassDecls unf_env 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_inst_info, deriv_binds) ->
- tcSetInstEnv inst_env $
-
- -- 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_`
- tcInterfaceSigs unf_env tycl_decls `thenTc` \ sig_ids ->
- tcExtendGlobalValEnv sig_ids $
-
-
- tcIfaceRules (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 ->
- let
- all_things = nameEnvElts (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
- | isHomeModule this_mod
- = filter (not . isLocalThing this_mod) all_things
- | otherwise
- = all_things
-
- new_pte :: PackageTypeEnv
- new_pte = extendTypeEnvList (pcs_PTE pcs) imported_things
-
- 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_inst_info, deriv_binds, local_rules)
- )
+ = checkNoErrsTc $
+ -- 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 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 $
+
+ -- 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_`
+ tcInterfaceSigs unf_env this_mod tycl_decls `thenTc` \ sig_ids ->
+ tcExtendGlobalValEnv sig_ids $
+
+
+ tcIfaceRules (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 ->
+ let
+ all_things = nameEnvElts (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
+
+ new_pte :: PackageTypeEnv
+ new_pte = extendTypeEnvList (pcs_PTE pcs) imported_things
+
+ 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)
where
tycl_decls = [d | TyClD d <- decls]
iface_rules = [d | RuleD d <- decls, isIfaceRuleDecl d]
\end{code}
+
%************************************************************************
%* *
\subsection{Checking the type of main}
%************************************************************************
%* *
-\subsection{Dumping output}
+\subsection{Interfacing the Tc monad to the IO monad}
%* *
%************************************************************************
\begin{code}
-printTcDump dflags Nothing = return ()
-printTcDump dflags (Just (_, results))
- = do dumpIfSet_dyn dflags Opt_D_dump_types
- "Type signatures" (dump_sigs results)
- dumpIfSet_dyn dflags Opt_D_dump_tc
- "Typechecked" (dump_tc results)
+typecheck :: DynFlags
+ -> PersistentCompilerState
+ -> HomeSymbolTable
+ -> PrintUnqualified -- For error printing
+ -> TcM r
+ -> IO (Maybe r)
-dump_tc results
- = vcat [ppr (tc_binds results),
- pp_rules (tc_rules results),
- ppr_gen_tycons [tc | ATyCon tc <- nameEnvElts (tc_env results)]
- ]
+typecheck dflags pcs hst unqual thing_inside
+ = do { showPass dflags "Typechecker";
+ ; env <- initTcEnv hst (pcs_PTE pcs)
+
+ ; (maybe_tc_result, errs) <- initTc dflags env thing_inside
+
+ ; printErrorsAndWarnings unqual errs
-dump_sigs results -- Print type signatures
- = -- Convert to HsType so that we get source-language style printing
- -- And sort by RdrName
- vcat $ map ppr_sig $ sortLt lt_sig $
- [ (toRdrName id, toHsType (idType id))
- | AnId id <- nameEnvElts (tc_env results),
- want_sig id
+ ; if errorsFound errs then
+ return Nothing
+ else
+ return maybe_tc_result
+ }
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{Dumping output}
+%* *
+%************************************************************************
+
+\begin{code}
+printTcDump dflags unqual Nothing = return ()
+printTcDump dflags unqual (Just (_, results))
+ = do if dopt Opt_D_dump_types dflags || dopt Opt_D_dump_tc dflags then
+ printForUser stdout unqual (dump_tc_iface dflags results)
+ else return ()
+
+ dumpIfSet_dyn dflags Opt_D_dump_tc
+ "Typechecked" (ppr (tc_binds results))
+
+
+printIfaceDump dflags Nothing = return ()
+printIfaceDump dflags (Just (_, details))
+ = dumpIfSet_dyn_or dflags [Opt_D_dump_types, Opt_D_dump_tc]
+ "Interface" (pprModDetails details)
+
+dump_tc_iface dflags results
+ = vcat [pprModDetails (ModDetails {md_types = tc_env results,
+ md_insts = tc_insts results,
+ md_rules = [], md_binds = []}) ,
+ ppr_rules (tc_rules results),
+
+ if dopt Opt_Generics dflags then
+ ppr_gen_tycons [tc | ATyCon tc <- nameEnvElts (tc_env results)]
+ else
+ empty
]
- where
- lt_sig (n1,_) (n2,_) = n1 < n2
- ppr_sig (n,t) = ppr n <+> dcolon <+> ppr t
- want_sig id | opt_PprStyle_Debug = True
- | otherwise = isLocalId id && isGlobalName (idName id)
- -- isLocalId ignores data constructors, records selectors etc
- -- The isGlobalName ignores local dictionary and method bindings
- -- that the type checker has invented. User-defined things have
- -- Global names.
+ppr_rules [] = empty
+ppr_rules rs = vcat [ptext SLIT("{-# RULES"),
+ nest 4 (vcat (map ppr rs)),
+ ptext SLIT("#-}")]
ppr_gen_tycons tcs = vcat [ptext SLIT("{-# Generic type constructor details"),
vcat (map ppr_gen_tycon tcs),
| otherwise = ppr tycon <> colon <+> ptext SLIT("Not derivable")
ppr_ep (EP from to)
- = vcat [ ptext SLIT("Rep type:") <+> ppr (funResultTy from_tau),
+ = vcat [ ptext SLIT("Rep type:") <+> ppr (tcFunResultTy from_tau),
ptext SLIT("From:") <+> ppr (unfoldingTemplate (idUnfolding from)),
ptext SLIT("To:") <+> ppr (unfoldingTemplate (idUnfolding to))
]
where
- (_,from_tau) = splitForAllTys (idType from)
-
-pp_rules [] = empty
-pp_rules rs = vcat [ptext SLIT("{-# RULES"),
- nest 4 (vcat (map ppr rs)),
- ptext SLIT("#-}")]
+ (_,from_tau) = tcSplitForAllTys (idType from)
\end{code}
projects / ghc-hetmet.git / blobdiff