\section[TcModule]{Typechecking a whole module}
\begin{code}
-{-# OPTIONS -w #-}
--- The above warning supression flag is a temporary kludge.
--- While working on this module you are encouraged to remove it and fix
--- any warnings in the module. See
--- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
--- for details
-
module TcRnDriver (
#ifdef GHCI
tcRnStmt, tcRnExpr, tcRnType,
tcRnExtCore
) where
-import System.IO
#ifdef GHCI
import {-# SOURCE #-} TcSplice ( tcSpliceDecls )
#endif
import DynFlags
import StaticFlags
import HsSyn
-import RdrHsSyn
import PrelNames
import RdrName
import TcHsSyn
import TcExpr
import TcRnMonad
-import TcType
+import Coercion
import Inst
import FamInst
import InstEnv
import RnNames
import RnEnv
import RnSource
-import RnHsDoc
import PprCore
import CoreSyn
import ErrUtils
import VarEnv
import Var
import Module
-import LazyUniqFM
+import UniqFM
import Name
import NameEnv
import NameSet
import TyCon
-import TysWiredIn
+import TysPrim
import SrcLoc
import HscTypes
import ListSetOps
import Data.List ( sortBy )
#ifdef GHCI
-import Linker
import TcHsType
import TcMType
import TcMatches
import RnExpr
import IfaceEnv
import MkId
-import IdInfo
-import {- Kind parts of -} Type
import BasicTypes
-import Foreign.Ptr( Ptr )
-import TidyPgm ( globaliseAndTidyId )
+import TidyPgm ( globaliseAndTidyId )
+import TcType ( isUnitTy, isTauTy, tyClsNamesOfDFunHead )
+import TysWiredIn ( unitTy, mkListTy )
#endif
import FastString
import Bag
import Control.Monad
-import Data.Maybe ( isJust )
#include "HsVersions.h"
\end{code}
-
-
%************************************************************************
%* *
Typecheck and rename a module
tcRnModule hsc_env hsc_src save_rn_syntax
(L loc (HsModule maybe_mod export_ies
import_decls local_decls mod_deprec
- module_info maybe_doc))
+ maybe_doc_hdr))
= do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
let { this_pkg = thisPackage (hsc_dflags hsc_env) ;
tcg_env <- rnExports (isJust maybe_mod) export_ies tcg_env ;
traceRn (text "rn4b: after exportss") ;
+ -- Check that main is exported (must be after rnExports)
+ checkMainExported tcg_env ;
+
-- Compare the hi-boot iface (if any) with the real thing
-- Must be done after processing the exports
tcg_env <- checkHiBootIface tcg_env boot_iface ;
-- because the latter might add new bindings for boot_dfuns,
-- which may be mentioned in imported unfoldings
- -- Rename the Haddock documentation
- tcg_env <- rnHaddock module_info maybe_doc tcg_env ;
+ -- Don't need to rename the Haddock documentation,
+ -- it's not parsed by GHC anymore.
+ tcg_env <- return (tcg_env { tcg_doc_hdr = maybe_doc_hdr }) ;
-- Report unused names
reportUnusedNames export_ies tcg_env ;
mg_inst_env = tcg_inst_env tcg_env,
mg_fam_inst_env = tcg_fam_inst_env tcg_env,
mg_rules = [],
+ mg_anns = [],
mg_binds = core_binds,
-- Stubs
return mod_guts
}}}}
+mkFakeGroup :: [LTyClDecl a] -> HsGroup a
mkFakeGroup decls -- Rather clumsy; lots of unused fields
= emptyRdrGroup { hs_tyclds = decls }
\end{code}
-- Loops around dealing with each top level inter-splice group
-- in turn, until it's dealt with the entire module
tc_rn_src_decls boot_details ds
- = do { let { (first_group, group_tail) = findSplice ds } ;
+ = do { (first_group, group_tail) <- findSplice ds ;
-- If ds is [] we get ([], Nothing)
-- Deal with decls up to, but not including, the first splice
return (tcg_env, tcl_env)
} ;
- -- If there's a splice, we must carry on
- Just (SpliceDecl splice_expr, rest_ds) -> do {
#ifndef GHCI
+ -- There shouldn't be a splice
+ Just (SpliceDecl {}, _) -> do {
failWithTc (text "Can't do a top-level splice; need a bootstrapped compiler")
#else
+ -- If there's a splice, we must carry on
+ Just (SpliceDecl splice_expr _, rest_ds) -> do {
-- Rename the splice expression, and get its supporting decls
(rn_splice_expr, splice_fvs) <- checkNoErrs (rnLExpr splice_expr) ;
\begin{code}
tcRnHsBootDecls :: [LHsDecl RdrName] -> TcM TcGblEnv
tcRnHsBootDecls decls
- = do { let { (first_group, group_tail) = findSplice decls }
-
- ; case group_tail of
- Just stuff -> spliceInHsBootErr stuff
- Nothing -> return ()
+ = do { (first_group, group_tail) <- findSplice decls
-- Rename the declarations
; (tcg_env, HsGroup {
hs_tyclds = tycl_decls,
hs_instds = inst_decls,
hs_derivds = deriv_decls,
- hs_fords = _,
- hs_defds = _, -- Todo: check no foreign decls, no rules,
- hs_ruleds = _, -- no default decls and no annotation decls
+ hs_fords = for_decls,
+ hs_defds = def_decls,
+ hs_ruleds = rule_decls,
hs_annds = _,
hs_valds = val_binds }) <- rnTopSrcDecls first_group
; setGblEnv tcg_env $ do {
+ -- Check for illegal declarations
+ ; case group_tail of
+ Just (SpliceDecl d _, _) -> badBootDecl "splice" d
+ Nothing -> return ()
+ ; mapM_ (badBootDecl "foreign") for_decls
+ ; mapM_ (badBootDecl "default") def_decls
+ ; mapM_ (badBootDecl "rule") rule_decls
+
-- Typecheck type/class decls
; traceTc (text "Tc2")
; (tcg_env, aux_binds) <- tcTyAndClassDecls emptyModDetails tycl_decls
; setGblEnv tcg_env $ do {
-- Typecheck instance decls
+ -- Family instance declarations are rejected here
; traceTc (text "Tc3")
; (tcg_env, inst_infos, _deriv_binds)
<- tcInstDecls1 tycl_decls inst_decls deriv_decls
; let { type_env0 = tcg_type_env gbl_env
; type_env1 = extendTypeEnvWithIds type_env0 val_ids
; type_env2 = extendTypeEnvWithIds type_env1 dfun_ids
- ; type_env3 = extendTypeEnvWithIds type_env1 aux_ids
+ ; type_env3 = extendTypeEnvWithIds type_env2 aux_ids
; dfun_ids = map iDFunId inst_infos
; aux_ids = case aux_binds of
ValBindsOut _ sigs -> [id | L _ (IdSig id) <- sigs]
_ -> panic "tcRnHsBoodDecls"
}
- ; setGlobalTypeEnv gbl_env type_env2
+ ; setGlobalTypeEnv gbl_env type_env3
}}}}
-spliceInHsBootErr (SpliceDecl (L loc _), _)
- = addErrAt loc (ptext (sLit "Splices are not allowed in hs-boot files"))
+badBootDecl :: String -> Located decl -> TcM ()
+badBootDecl what (L loc _)
+ = addErrAt loc (char 'A' <+> text what
+ <+> ptext (sLit "declaration is not (currently) allowed in a hs-boot file"))
\end{code}
Once we've typechecked the body of the module, we want to compare what
checkHiBootIface
tcg_env@(TcGblEnv { tcg_src = hs_src, tcg_binds = binds,
- tcg_insts = local_insts, tcg_fam_insts = local_fam_insts,
+ tcg_insts = local_insts,
tcg_type_env = local_type_env, tcg_exports = local_exports })
(ModDetails { md_insts = boot_insts, md_fam_insts = boot_fam_insts,
md_types = boot_type_env, md_exports = boot_exports })
-- Check instance declarations
; mb_dfun_prs <- mapM check_inst boot_insts
- ; let tcg_env' = tcg_env { tcg_binds = binds `unionBags` dfun_binds }
- final_type_env = extendTypeEnvWithIds local_type_env boot_dfuns
+ ; let tcg_env' = tcg_env { tcg_binds = binds `unionBags` dfun_binds,
+ tcg_type_env = extendTypeEnvWithIds local_type_env boot_dfuns }
dfun_prs = catMaybes mb_dfun_prs
boot_dfuns = map fst dfun_prs
- dfun_binds = listToBag [ noLoc $ VarBind boot_dfun (nlHsVar dfun)
+ dfun_binds = listToBag [ mkVarBind boot_dfun (nlHsVar dfun)
| (boot_dfun, dfun) <- dfun_prs ]
; failIfErrsM
- ; setGlobalTypeEnv tcg_env' final_type_env }
+ ; return tcg_env' }
where
check_export boot_avail -- boot_avail is exported by the boot iface
| name `elem` dfun_names = return ()
eqSig (id1, def_meth1) (id2, def_meth2)
= idName id1 == idName id2 &&
- tcEqTypeX env op_ty1 op_ty2
+ tcEqTypeX env op_ty1 op_ty2 &&
+ def_meth1 == def_meth2
where
(_, rho_ty1) = splitForAllTys (idType id1)
op_ty1 = funResultTy rho_ty1
eqListBy eqSig op_stuff1 op_stuff2 &&
eqListBy checkBootTyCon ats1 ats2)
-checkBootDecl (ADataCon dc1) (ADataCon dc2)
+checkBootDecl (ADataCon dc1) (ADataCon _)
= pprPanic "checkBootDecl" (ppr dc1)
checkBootDecl _ _ = False -- probably shouldn't happen
= tcEqTypeX env k1 k2
eqSynRhs (SynonymTyCon t1) (SynonymTyCon t2)
= tcEqTypeX env t1 t2
+ eqSynRhs _ _ = False
in
equalLength tvs1 tvs2 &&
eqSynRhs (synTyConRhs tc1) (synTyConRhs tc2)
| isForeignTyCon tc1 && isForeignTyCon tc2
= eqKind (tyConKind tc1) (tyConKind tc2) &&
tyConExtName tc1 == tyConExtName tc2
+
+ | otherwise = False
where
env0 = mkRnEnv2 emptyInScopeSet
(dataConOrigArgTys c2)
----------------
-missingBootThing thing what
- = ppr thing <+> ptext (sLit "is exported by the hs-boot file, but not")
+missingBootThing :: Name -> String -> SDoc
+missingBootThing name what
+ = ppr name <+> ptext (sLit "is exported by the hs-boot file, but not")
<+> text what <+> ptext (sLit "the module")
+bootMisMatch :: TyThing -> IfaceDecl -> IfaceDecl -> SDoc
bootMisMatch thing boot_decl real_decl
= vcat [ppr thing <+> ptext (sLit "has conflicting definitions in the module and its hs-boot file"),
ptext (sLit "Main module:") <+> ppr real_decl,
ptext (sLit "Boot file: ") <+> ppr boot_decl]
+instMisMatch :: Instance -> SDoc
instMisMatch inst
= hang (ppr inst)
2 (ptext (sLit "is defined in the hs-boot file, but not in the module itself"))
check_main dflags tcg_env
}
+check_main :: DynFlags -> TcGblEnv -> TcM TcGblEnv
check_main dflags tcg_env
| mod /= main_mod
= traceTc (text "checkMain not" <+> ppr main_mod <+> ppr mod) >>
(mkTyConApp ioTyCon [res_ty])
; co = mkWpTyApps [res_ty]
; rhs = nlHsApp (mkLHsWrap co (nlHsVar run_main_id)) main_expr
- ; main_bind = noLoc (VarBind root_main_id rhs) }
+ ; main_bind = mkVarBind root_main_id rhs }
- ; return (tcg_env { tcg_binds = tcg_binds tcg_env
+ ; return (tcg_env { tcg_main = Just main_name,
+ tcg_binds = tcg_binds tcg_env
`snocBag` main_bind,
tcg_dus = tcg_dus tcg_env
`plusDU` usesOnly (unitFV main_name)
-- Record the use of 'main', so that we don't
-- complain about it being defined but not used
- })
+ })
}}}
where
mod = tcg_mod tcg_env
mainCtxt = ptext (sLit "When checking the type of the") <+> pp_main_fn
noMainMsg = ptext (sLit "The") <+> pp_main_fn
<+> ptext (sLit "is not defined in module") <+> quotes (ppr main_mod)
- pp_main_fn | main_fn == main_RDR_Unqual = ptext (sLit "function") <+> quotes (ppr main_fn)
- | otherwise = ptext (sLit "main function") <+> quotes (ppr main_fn)
+ pp_main_fn = ppMainFn main_fn
+
+ppMainFn :: RdrName -> SDoc
+ppMainFn main_fn
+ | main_fn == main_RDR_Unqual
+ = ptext (sLit "function") <+> quotes (ppr main_fn)
+ | otherwise
+ = ptext (sLit "main function") <+> quotes (ppr main_fn)
-- | Get the unqualified name of the function to use as the \"main\" for the main module.
-- Either returns the default name or the one configured on the command line with -main-is
getMainFun dflags = case (mainFunIs dflags) of
Just fn -> mkRdrUnqual (mkVarOccFS (mkFastString fn))
Nothing -> main_RDR_Unqual
+
+checkMainExported :: TcGblEnv -> TcM ()
+checkMainExported tcg_env = do
+ dflags <- getDOpts
+ case tcg_main tcg_env of
+ Nothing -> return () -- not the main module
+ Just main_name -> do
+ let main_mod = mainModIs dflags
+ checkTc (main_name `elem` concatMap availNames (tcg_exports tcg_env)) $
+ ptext (sLit "The") <+> ppMainFn (nameRdrName main_name) <+>
+ ptext (sLit "is not exported by module") <+> quotes (ppr main_mod)
\end{code}
Note [Root-main Id]
setInteractiveContext hsc_env icxt thing_inside
= let -- Initialise the tcg_inst_env with instances from all home modules.
-- This mimics the more selective call to hptInstances in tcRnModule.
- (home_insts, home_fam_insts) = hptInstances hsc_env (\mod -> True)
+ (home_insts, home_fam_insts) = hptInstances hsc_env (\_ -> True)
in
updGblEnv (\env -> env {
tcg_rdr_env = ic_rn_gbl_env icxt,
setInteractiveContext hsc_env ictxt $ do {
-- Rename; use CmdLineMode because tcRnStmt is only used interactively
- (([rn_stmt], _), fvs) <- rnStmts DoExpr [rdr_stmt] (return ((), emptyFVs)) ;
+ (([rn_stmt], _), fvs) <- rnStmts GhciStmt [rdr_stmt] (return ((), emptyFVs)) ;
traceRn (text "tcRnStmt" <+> vcat [ppr rdr_stmt, ppr rn_stmt, ppr fvs]) ;
failIfErrsM ;
rnDump (ppr rn_stmt) ;
-- None of the Ids should be of unboxed type, because we
-- cast them all to HValues in the end!
- mapM bad_unboxed (filter (isUnLiftedType . idType) zonked_ids) ;
+ mapM_ bad_unboxed (filter (isUnLiftedType . idType) zonked_ids) ;
traceTc (text "tcs 1") ;
let { global_ids = map globaliseAndTidyId zonked_ids } ;
-- The two-step process avoids getting two errors: one from
-- the expression itself, and one from the 'print it' part
-- This two-step story is very clunky, alas
- do { checkNoErrs (tcGhciStmts [let_stmt])
+ do { _ <- checkNoErrs (tcGhciStmts [let_stmt])
--- checkNoErrs defeats the error recovery of let-bindings
; tcGhciStmts [let_stmt, print_it] }
]}
mkPlan stmt@(L loc (BindStmt {}))
- | [L _ v] <- collectLStmtBinders stmt -- One binder, for a bind stmt
+ | [v] <- collectLStmtBinders stmt -- One binder, for a bind stmt
= do { let print_v = L loc $ ExprStmt (nlHsApp (nlHsVar printName) (nlHsVar v))
(HsVar thenIOName) placeHolderType
let {
ret_ty = mkListTy unitTy ;
io_ret_ty = mkTyConApp ioTyCon [ret_ty] ;
- tc_io_stmts stmts = tcStmts DoExpr tcDoStmt stmts io_ret_ty ;
+ tc_io_stmts stmts = tcStmts GhciStmt tcDoStmt stmts io_ret_ty ;
- names = map unLoc (collectLStmtsBinders stmts) ;
+ names = collectLStmtsBinders stmts ;
-- mk_return builds the expression
-- returnIO @ [()] [coerce () x, .., coerce () z]
traceTc (text "TcRnDriver.tcGhciStmts: done") ;
return (ids, mkHsDictLet const_binds $
- noLoc (HsDo DoExpr tc_stmts (mk_return ids) io_ret_ty))
+ noLoc (HsDo GhciStmt tc_stmts (mk_return ids) io_ret_ty))
}
\end{code}
= initTcPrintErrors hsc_env iNTERACTIVE $
setInteractiveContext hsc_env ictxt $ do {
- (rn_expr, fvs) <- rnLExpr rdr_expr ;
+ (rn_expr, _fvs) <- rnLExpr rdr_expr ;
failIfErrsM ;
-- Now typecheck the expression;
-- it might have a rank-2 type (e.g. :t runST)
- ((tc_expr, res_ty), lie) <- getLIE (tcInferRho rn_expr) ;
+ ((_tc_expr, res_ty), lie) <- getLIE (tcInferRho rn_expr) ;
((qtvs, dict_insts, _), lie_top) <- getLIE (tcSimplifyInfer smpl_doc (tyVarsOfType res_ty) lie) ;
- tcSimplifyInteractive lie_top ;
+ _ <- tcSimplifyInteractive lie_top ; -- Ignore the dicionary bindings
let { all_expr_ty = mkForAllTys qtvs $
mkFunTys (map (idType . instToId) dict_insts) $
failIfErrsM ;
-- Now kind-check the type
- (ty', kind) <- kcLHsType rn_type ;
+ (_ty', kind) <- kcLHsType rn_type ;
return kind
}
where
setInteractiveContext hsc_env (hsc_IC hsc_env) $
lookup_rdr_name rdr_name
+lookup_rdr_name :: RdrName -> TcM [Name]
lookup_rdr_name rdr_name = do {
-- If the identifier is a constructor (begins with an
-- upper-case letter), then we need to consider both
-> Name
-> IO (Messages, Maybe (TyThing, Fixity, [Instance]))
--- Used to implemnent :info in GHCi
+-- Used to implement :info in GHCi
--
-- Look up a RdrName and return all the TyThings it might be
-- A capitalised RdrName is given to us in the DataName namespace,
; return (classInstances inst_envs cls) }
lookupInsts (ATyCon tc)
- = do { eps <- getEps -- Load all instances for all classes that are
- -- in the type environment (which are all the ones
- -- we've seen in any interface file so far)
- ; (pkg_ie, home_ie) <- tcGetInstEnvs -- Search all
- ; return [ ispec
+ = do { (pkg_ie, home_ie) <- tcGetInstEnvs
+ -- Load all instances for all classes that are
+ -- in the type environment (which are all the ones
+ -- we've seen in any interface file so far)
+ ; return [ ispec -- Search all
| ispec <- instEnvElts home_ie ++ instEnvElts pkg_ie
, let dfun = instanceDFunId ispec
, relevant dfun ] }
relevant df = tc_name `elemNameSet` tyClsNamesOfDFunHead (idType df)
tc_name = tyConName tc
-lookupInsts other = return []
+lookupInsts _ = return []
loadUnqualIfaces :: InteractiveContext -> TcM ()
-- Load the home module for everything that is in scope unqualified
-- NB: foreign x-d's have undefined's in their types;
-- hence can't show the tc_fords
+tcCoreDump :: ModGuts -> TcM ()
tcCoreDump mod_guts
= do { dflags <- getDOpts ;
when (dopt Opt_D_dump_types dflags || dopt Opt_D_dump_tc dflags)
where
le_sig tycon1 tycon2 = getOccName tycon1 <= getOccName tycon2
ppr_tycon tycon
- | isCoercionTyCon tycon = ptext (sLit "coercion") <+> ppr tycon
+ | isCoercionTyCon tycon
+ = sep [ptext (sLit "coercion") <+> ppr tycon <+> ppr tvs
+ , nest 2 (dcolon <+> pprEqPred (coercionKind (mkTyConApp tycon (mkTyVarTys tvs))))]
| otherwise = ppr (tyThingToIfaceDecl (ATyCon tycon))
+ where
+ tvs = take (tyConArity tycon) alphaTyVars
ppr_rules :: [CoreRule] -> SDoc
ppr_rules [] = empty
nest 4 (pprRules rs),
ptext (sLit "#-}")]
+ppr_gen_tycons :: [TyCon] -> SDoc
ppr_gen_tycons [] = empty
ppr_gen_tycons tcs = vcat [ptext (sLit "Tycons with generics:"),
nest 2 (fsep (map ppr (filter tyConHasGenerics tcs)))]
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