\begin{code}
module TcModule (
- typecheckModule, typecheckIface, typecheckStmt, TcResults(..)
+ typecheckModule, typecheckIface, typecheckStmt, typecheckExpr,
+ TcResults(..)
) where
#include "HsVersions.h"
-import CmdLineOpts ( DynFlag(..), DynFlags, opt_PprStyle_Debug )
+import CmdLineOpts ( DynFlag(..), DynFlags )
import HsSyn ( HsBinds(..), MonoBinds(..), HsDecl(..), HsExpr(..),
- Stmt(..), InPat(..), HsMatchContext(..),
+ Stmt(..), InPat(..), HsMatchContext(..), RuleDecl(..),
isIfaceRuleDecl, nullBinds, andMonoBindList, mkSimpleMatch
)
-import HsTypes ( toHsType )
import PrelNames ( SyntaxMap, mAIN_Name, mainName, ioTyConName, printName,
returnIOName, bindIOName, failIOName,
itName
)
import MkId ( unsafeCoerceId )
-import RnHsSyn ( RenamedHsBinds, RenamedHsDecl, RenamedStmt )
+import RnHsSyn ( RenamedHsBinds, RenamedHsDecl, RenamedStmt,
+ RenamedHsExpr )
import TcHsSyn ( TypecheckedMonoBinds, TypecheckedHsExpr,
TypecheckedForeignDecl, TypecheckedRuleDecl,
zonkTopBinds, zonkForeignExports, zonkRules, mkHsLet,
zonkExpr, zonkIdBndr
)
-
+import MkIface ( pprModDetails )
+import TcExpr ( tcMonoExpr )
import TcMonad
import TcType ( newTyVarTy, zonkTcType, tcInstType )
import TcMatches ( tcStmtsAndThen )
import TcBinds ( tcTopBinds )
import TcClassDcl ( tcClassDecls2 )
import TcDefaults ( tcDefaults, defaultDefaultTys )
-import TcEnv ( TcEnv, RecTcEnv, InstInfo, tcExtendGlobalValEnv, tcLookup_maybe,
+import TcEnv ( TcEnv, RecTcEnv, InstInfo(iDFunId), tcExtendGlobalValEnv, tcLookup_maybe,
isLocalThing, tcSetEnv, tcSetInstEnv, initTcEnv, getTcGEnv,
tcExtendGlobalTypeEnv, tcLookupGlobalId, tcLookupTyCon,
- TcTyThing(..), tcLookupId
+ TcTyThing(..), tcLookupId
)
import TcRules ( tcIfaceRules, tcSourceRules )
import TcForeign ( tcForeignImports, tcForeignExports )
import TcIfaceSig ( tcInterfaceSigs )
import TcInstDcls ( tcInstDecls1, tcInstDecls2 )
-import TcSimplify ( tcSimplifyTop )
+import TcSimplify ( tcSimplifyTop, tcSimplifyInfer )
import TcTyClsDecls ( tcTyAndClassDecls )
import CoreUnfold ( unfoldingTemplate, hasUnfolding )
import TysWiredIn ( mkListTy, unitTy )
-import Type ( funResultTy, splitForAllTys,
- liftedTypeKind, mkTyConApp, tidyType )
-import ErrUtils ( printErrorsAndWarnings, errorsFound, dumpIfSet_dyn, showPass )
-import Id ( Id, idType, idName, isLocalId, idUnfolding )
-import Module ( Module, isHomeModule, moduleName )
-import Name ( Name, toRdrName, isGlobalName )
-import Name ( nameEnvElts, lookupNameEnv )
+import Type
+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, RecFlag(..) )
import SrcLoc ( noSrcLoc )
import Outputable
import HscTypes ( PersistentCompilerState(..), HomeSymbolTable,
PackageTypeEnv, ModIface(..),
+ ModDetails(..), DFunId,
TypeEnv, extendTypeEnvList,
TyThing(..), implicitTyThingIds,
mkTypeEnv
)
+import VarSet
\end{code}
%************************************************************************
\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)
- -> (SyntaxMap,
- RenamedStmt, -- The stmt itself
- [RenamedHsDecl]) -- Plus extra decls it sucked in from interface files
- -> IO (Maybe (PersistentCompilerState, TypecheckedHsExpr, [Id]))
- -- The returned [Name] is the same as the input except for
- -- ExprStmt, in which case the returned [Name] is [itName]
+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)
+ -> (SyntaxMap,
+ 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 (syn_map, stmt, iface_decls)
= typecheck dflags syn_map pcs hst unqual $
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)
+ returnTc (new_pcs, zonked_expr, zonked_ids, error "typecheckStmt: no type")
where
get_fixity :: Name -> Maybe Fixity
- get_fixity n = pprPanic "typecheckExpr" (ppr n)
+ get_fixity n = pprPanic "typecheckStmt" (ppr n)
\end{code}
Here is the grand plan, implemented in tcUserStmt
combine stmt (ids, stmts) = (ids, stmt:stmts)
\end{code}
+%************************************************************************
+%* *
+\subsection{Typechecking an expression}
+%* *
+%************************************************************************
+
+\begin{code}
+typecheckExpr :: DynFlags
+ -> PersistentCompilerState
+ -> HomeSymbolTable
+ -> TypeEnv -- The interactive context's type envt
+ -> PrintUnqualified -- For error printing
+ -> Module
+ -> (SyntaxMap,
+ RenamedHsExpr, -- The expression itself
+ [RenamedHsDecl]) -- Plus extra decls it sucked in from interface files
+ -> IO (Maybe (PersistentCompilerState,
+ TypecheckedHsExpr,
+ [Id], -- always empty (matches typecheckStmt)
+ Type))
+
+typecheckExpr dflags pcs hst ic_type_env unqual this_mod (syn_map, expr, decls)
+ = typecheck dflags syn_map pcs hst unqual $
+
+ -- use the default default settings, i.e. [Integer, Double]
+ 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 )
+
+ -- Now typecheck the expression
+ tcSetEnv env $
+ tcExtendGlobalTypeEnv ic_type_env $
+
+ newTyVarTy openTypeKind `thenTc` \ ty ->
+ tcMonoExpr expr ty `thenTc` \ (e', lie) ->
+ tcSimplifyInfer smpl_doc (varSetElems (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 $
+ 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 ->
+ ioToTc (dumpIfSet_dyn dflags
+ Opt_D_dump_tc "Typechecked" (ppr zonked_expr)) `thenNF_Tc_`
+ 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}
%************************************************************************
%* *
= 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.
- tc_rules :: [TypecheckedRuleDecl] -- Transformation rules
+ tc_fords :: [TypecheckedForeignDecl] -- Foreign import & exports.
}
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_fodecls `plusLIE`
lie_rules
in
- traceTc (text "Tc6") `thenNF_Tc_`
- tcSimplifyTop lie_alldecls `thenTc` \ const_inst_binds ->
-
- -- CHECK THAT main IS DEFINED WITH RIGHT TYPE, IF REQUIRED
- tcCheckMain this_mod `thenTc_`
+ tcSimplifyTop lie_alldecls `thenTc` \ const_inst_binds ->
-- Backsubstitution. This must be done last.
-- Even tcSimplifyTop may do some unification.
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
-> HomeSymbolTable
-> ModIface -- Iface for this module (just module & fixities)
-> (SyntaxMap, [RenamedHsDecl])
- -> IO (Maybe (PersistentCompilerState, TypeEnv, [TypecheckedRuleDecl]))
+ -> IO (Maybe (PersistentCompilerState, ModDetails))
-- The new PCS is Augmented with imported information,
-- (but not stuff from this module).
- -- The TcResults returned contains only the environment
- -- and rules.
-
typecheckIface dflags pcs hst mod_iface (syn_map, decls)
= do { maybe_tc_stuff <- typecheck dflags syn_map pcs hst alwaysQualify $
deriv_binds, local_rules) ->
ASSERT(nullBinds deriv_binds)
let
- local_things = filter (isLocalThing this_mod)
- (nameEnvElts (getTcGEnv env))
- local_type_env :: TypeEnv
- local_type_env = mkTypeEnv local_things
- in
-
- -- throw away local_inst_info
- returnTc (new_pcs, local_type_env, local_rules)
+ 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
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
-- 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 ->
+ tcInterfaceSigs unf_env this_mod tycl_decls `thenTc` \ sig_ids ->
tcExtendGlobalValEnv sig_ids $
-- (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
-
+ = filter (not . isLocalThing this_mod) all_things
+
new_pte :: PackageTypeEnv
new_pte = extendTypeEnvList (pcs_PTE pcs) imported_things
\begin{code}
printTcDump dflags Nothing = return ()
printTcDump dflags (Just (_, results))
- = do dumpIfSet_dyn dflags Opt_D_dump_types
- "Type signatures" (dump_sigs (tc_env results))
- dumpIfSet_dyn dflags Opt_D_dump_tc
- "Typechecked" (dump_tc results)
+ = do dumpIfSet_dyn_or dflags [Opt_D_dump_types, Opt_D_dump_tc]
+ "Interface" (dump_tc_iface results)
-printIfaceDump dflags Nothing = return ()
-printIfaceDump dflags (Just (_, env, rules))
- = do dumpIfSet_dyn dflags Opt_D_dump_types
- "Type signatures" (dump_sigs env)
dumpIfSet_dyn dflags Opt_D_dump_tc
- "Typechecked" (dump_iface env rules)
+ "Typechecked" (ppr (tc_binds results))
-dump_tc results
- = vcat [ppr (tc_binds results),
- pp_rules (tc_rules results),
- ppr_gen_tycons [tc | ATyCon tc <- nameEnvElts (tc_env 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_iface env rules
- = vcat [pp_rules rules,
- ppr_gen_tycons [tc | ATyCon tc <- nameEnvElts env]
- ]
+dump_tc_iface results
+ = vcat [pprModDetails (ModDetails {md_types = tc_env results,
+ md_insts = tc_insts results,
+ md_rules = [], md_binds = []}) ,
+ ppr_rules (tc_rules results),
-dump_sigs env -- 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 env,
- want_sig id
+ ppr_gen_tycons [tc | ATyCon tc <- nameEnvElts (tc_env results)]
]
- 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),
where
(_,from_tau) = splitForAllTys (idType from)
-pp_rules [] = empty
-pp_rules rs = vcat [ptext SLIT("{-# RULES"),
- nest 4 (vcat (map ppr rs)),
- ptext SLIT("#-}")]
\end{code}
projects / ghc-hetmet.git / blobdiff