import CmdLineOpts ( DynFlag(..), opt_PprStyle_Debug, dopt )
import DriverState ( v_MainModIs, v_MainFunIs )
-import DriverUtil ( split_longest_prefix )
import HsSyn ( HsModule(..), HsBinds(..), MonoBinds(..), HsExpr(..),
Stmt(..), Pat(VarPat), HsStmtContext(..), RuleDecl(..),
HsGroup(..), SpliceDecl(..),
import PrelNames ( iNTERACTIVE, ioTyConName, printName, monadNames,
returnIOName, runIOName,
- dollarMainName, itName, mAIN_Name, unsafeCoerceName
+ rootMainName, itName, mAIN_Name
)
-import MkId ( unsafeCoerceId )
import RdrName ( RdrName, getRdrName, mkRdrUnqual,
lookupRdrEnv, elemRdrEnv )
import TcExpr ( tcInferRho, tcCheckRho )
import TcRnMonad
-import TcMType ( newTyVarTy, zonkTcType )
-import TcType ( Type, liftedTypeKind,
+import TcType ( Type,
tyVarsOfType, tcFunResultTy, tidyTopType,
mkForAllTys, mkFunTys, mkTyConApp, tcSplitForAllTys
)
-import TcMatches ( tcStmtsAndThen, TcStmtCtxt(..) )
import Inst ( showLIE, tcStdSyntaxName )
+import MkId ( unsafeCoerceId )
import TcBinds ( tcTopBinds )
import TcClassDcl ( tcClassDecls2 )
import TcDefaults ( tcDefaults )
import TcForeign ( tcForeignImports, tcForeignExports )
import TcIfaceSig ( tcInterfaceSigs, tcCoreBinds )
import TcInstDcls ( tcInstDecls1, tcIfaceInstDecls, tcInstDecls2 )
-import TcSimplify ( tcSimplifyTop, tcSimplifyInfer )
+import TcSimplify ( tcSimplifyTop, tcSimplifyInteractive, tcSimplifyInfer )
import TcTyClsDecls ( tcTyAndClassDecls )
import RnNames ( importsFromLocalDecls, rnImports, exportsFromAvail,
import RnHiFiles ( readIface, loadOldIface )
import RnEnv ( lookupSrcName, lookupOccRn, plusGlobalRdrEnv,
ubiquitousNames, implicitModuleFVs, implicitStmtFVs, dataTcOccs )
-import RnExpr ( rnStmts, rnExpr )
import RnSource ( rnSrcDecls, checkModDeprec, rnStats )
import CoreUnfold ( unfoldingTemplate )
import CoreSyn ( IdCoreRule, Bind(..) )
import PprCore ( pprIdRules, pprCoreBindings )
-import TysWiredIn ( mkListTy, unitTy )
import ErrUtils ( mkDumpDoc, showPass, pprBagOfErrors )
import Id ( Id, mkLocalId, isLocalId, idName, idType, idUnfolding, setIdLocalExported )
-import IdInfo ( GlobalIdDetails(..) )
import Var ( Var, setGlobalIdDetails )
-import Module ( Module, ModuleName, mkHomeModule, mkModuleName, moduleName, moduleUserString, moduleEnvElts )
+import Module ( Module, mkHomeModule, mkModuleName, moduleName, moduleUserString, moduleEnvElts )
import OccName ( mkVarOcc )
import Name ( Name, isExternalName, getSrcLoc, nameOccName )
-import NameEnv ( delListFromNameEnv )
import NameSet
import TyCon ( tyConGenInfo )
import BasicTypes ( EP(..), RecFlag(..) )
-import SrcLoc ( noSrcLoc )
import Outputable
import HscTypes ( PersistentCompilerState(..), InteractiveContext(..),
ModIface, ModDetails(..), ModGuts(..),
extendLocalRdrEnv, emptyFixityEnv
)
#ifdef GHCI
+import TcMType ( zonkTcType )
+import TcMatches ( tcStmtsAndThen, TcStmtCtxt(..) )
import RdrName ( rdrEnvElts )
+import RnExpr ( rnStmts, rnExpr )
import RnHiFiles ( loadInterface )
import RnEnv ( mkGlobalRdrEnv )
+import TysWiredIn ( mkListTy, unitTy )
+import IdInfo ( GlobalIdDetails(..) )
+import SrcLoc ( noSrcLoc )
+import NameEnv ( delListFromNameEnv )
import HscTypes ( GlobalRdrElt(..), GlobalRdrEnv, ImportReason(..), Provenance(..),
isLocalGRE )
#endif
-import DATA_IOREF ( readIORef )
import FastString ( mkFastString )
import Panic ( showException )
import List ( partition )
tc_stmts stmts
= do { ioTyCon <- tcLookupTyCon ioTyConName ;
let {
- ret_ty = mkListTy unitTy ;
- names = collectStmtsBinders stmts ;
+ ret_ty = mkListTy unitTy ;
+ io_ret_ty = mkTyConApp ioTyCon [ret_ty] ;
+
+ names = collectStmtsBinders stmts ;
stmt_ctxt = SC { sc_what = DoExpr,
sc_rhs = check_rhs,
sc_ty = ret_ty } ;
check_rhs rhs rhs_ty = tcCheckRho rhs (mkTyConApp ioTyCon [rhs_ty]) ;
- check_body body = tcCheckRho body (mkTyConApp ioTyCon [ret_ty]) ;
+ check_body body = tcCheckRho body io_ret_ty ;
- -- ret_expr is the expression
- -- returnIO [coerce () x, .., coerce () z]
- ret_stmt = ResultStmt ret_expr noSrcLoc ;
- ret_expr = HsApp (HsVar returnIOName)
- (ExplicitList placeHolderType (map mk_item names)) ;
- mk_item name = HsApp (HsVar unsafeCoerceName) (HsVar name) ;
-
- all_stmts = stmts ++ [ret_stmt] ;
+ -- mk_return builds the expression
+ -- returnIO @ [()] [coerce () x, .., coerce () z]
+ --
+ -- Despite the inconvenience of building the type applications etc,
+ -- this *has* to be done in type-annotated post-typecheck form
+ -- because we are going to return a list of *polymorphic* values
+ -- coerced to type (). If we built a *source* stmt
+ -- return [coerce x, ..., coerce z]
+ -- then the type checker would instantiate x..z, and we wouldn't
+ -- get their *polymorphic* values. (And we'd get ambiguity errs
+ -- if they were overloaded, since they aren't applied to anything.)
+ mk_return ret_id ids = HsApp (TyApp (HsVar ret_id) [ret_ty])
+ (ExplicitList unitTy (map mk_item ids)) ;
+ mk_item id = HsApp (TyApp (HsVar unsafeCoerceId) [idType id, unitTy])
+ (HsVar id) ;
io_ty = mkTyConApp ioTyCon []
} ;
-- OK, we're ready to typecheck the stmts
traceTc (text "tcs 2") ;
((ids, tc_expr), lie) <- getLIE $ do {
- (ids, tc_stmts) <- tcStmtsAndThen combine stmt_ctxt all_stmts $
+ (ids, tc_stmts) <- tcStmtsAndThen combine stmt_ctxt stmts $
do {
-- Look up the names right in the middle,
-- where they will all be in scope
ids <- mappM tcLookupId names ;
- return (ids, []) } ;
+ ret_id <- tcLookupId returnIOName ; -- return @ IO
+ return (ids, [ResultStmt (mk_return ret_id ids) noSrcLoc]) } ;
+
io_ids <- mappM (tcStdSyntaxName DoOrigin io_ty) monadNames ;
- return (ids, HsDo DoExpr tc_stmts io_ids
- (mkTyConApp ioTyCon [ret_ty]) noSrcLoc)
+ return (ids, HsDo DoExpr tc_stmts io_ids io_ret_ty noSrcLoc)
} ;
-- Simplify the context right here, so that we fail
-- and then let it = e
-- It's the simplify step that rejects the first.
traceTc (text "tcs 3") ;
- const_binds <- tcSimplifyTop lie ;
+ const_binds <- tcSimplifyInteractive lie ;
-- Build result expression and zonk it
let { expr = mkHsLet const_binds tc_expr } ;
-- it might have a rank-2 type (e.g. :t runST)
((tc_expr, res_ty), lie) <- getLIE (tcInferRho rn_expr) ;
((qtvs, _, dict_ids), lie_top) <- getLIE (tcSimplifyInfer smpl_doc (tyVarsOfType res_ty) lie) ;
- tcSimplifyTop lie_top ;
+ tcSimplifyInteractive lie_top ;
let { all_expr_ty = mkForAllTys qtvs $
mkFunTys (map idType dict_ids) $
-> RdrName
-> IO (PersistentCompilerState, Maybe [TyThing])
-- Look up a RdrName and return all the TyThings it might be
--- We treat a capitalised RdrName as both a data constructor
--- and as a type or class constructor; hence we return up to two results
+-- A capitalised RdrName is given to us in the DataName namespace,
+-- but we want to treat it as *both* a data constructor
+-- *and* as a type or class constructor;
+-- hence the call to dataTcOccs, and we return up to two results
tcRnThing hsc_env pcs ictxt rdr_name
= initTc hsc_env pcs iNTERACTIVE $
setInteractiveContext ictxt $ do {
errs_s = [msgs | (msgs, Nothing) <- results] } ;
-- Fail if nothing good happened, else add warnings
- if null good_names then -- Fail
+ if null good_names then
+ -- No lookup succeeded, so
+ -- pick the first error message and report it
+ -- ToDo: If one of the errors is "could be Foo.X or Baz.X",
+ -- while the other is "X is not in scope",
+ -- we definitely want the former; but we might pick the latter
do { addMessages (head errs_s) ; failM }
else -- Add deprecation warnings
mapM_ addMessages warns_s ;
= initRn CmdLineMode $
setLocalRdrEnv (ic_rn_local_env ictxt) $
rn_thing
-#endif
+#endif /* GHCI */
\end{code}
%************************************************************************
-- rnSrcDecls handles fixity decls etc too, which won't occur
-- but that doesn't matter
let { local_group = mkGroup decls } ;
- (_, rn_decls, dus) <- initRn (InterfaceMode this_mod)
- (rnSrcDecls local_group) ;
+ (_, rn_src_decls, dus) <- initRn (InterfaceMode this_mod)
+ (rnSrcDecls local_group) ;
failIfErrsM ;
-- Get the supporting decls
rn_imp_decls <- slurpImpDecls (duUses dus) ;
- let { rn_decls = rn_decls `addImpDecls` rn_imp_decls } ;
+ let { rn_decls = rn_src_decls `addImpDecls` rn_imp_decls } ;
-- Dump trace of renaming part
rnDump (ppr rn_decls) ;
addErrCtxt mainCtxt $
setGblEnv tcg_env $ do {
- -- $main :: IO () = runIO main
+ -- :Main.main :: IO () = runIO main
let { rhs = HsApp (HsVar runIOName) (HsVar main_name) } ;
(main_expr, ty) <- tcInferRho rhs ;
- let { dollar_main_id = setIdLocalExported (mkLocalId dollarMainName ty) ;
- main_bind = VarMonoBind dollar_main_id main_expr ;
+ let { root_main_id = setIdLocalExported (mkLocalId rootMainName ty) ;
+ main_bind = VarMonoBind root_main_id main_expr ;
tcg_env' = tcg_env { tcg_binds = tcg_binds tcg_env
`andMonoBinds` main_bind } } ;
projects / ghc-hetmet.git / blobdiff