module TcRnDriver (
#ifdef GHCI
mkExportEnv, getModuleContents, tcRnStmt,
- tcRnThing, tcRnExpr, tcRnType,
+ tcRnGetInfo, GetInfoResult,
+ tcRnExpr, tcRnType,
#endif
tcRnModule,
tcTopSrcDecls,
#include "HsVersions.h"
+import IO
#ifdef GHCI
import {-# SOURCE #-} TcSplice ( tcSpliceDecls )
#endif
-import CmdLineOpts ( DynFlag(..), opt_PprStyle_Debug, dopt )
-import DriverState ( v_MainModIs, v_MainFunIs )
+import DynFlags ( DynFlag(..), DynFlags(..), dopt, GhcMode(..) )
+import StaticFlags ( opt_PprStyle_Debug )
+import Packages ( moduleToPackageConfig, mkPackageId, package,
+ isHomeModule )
import HsSyn ( HsModule(..), HsExtCore(..), HsGroup(..), LHsDecl, SpliceDecl(..), HsBind(..),
nlHsApp, nlHsVar, pprLHsBinds )
import RdrHsSyn ( findSplice )
-import PrelNames ( runIOName, rootMainName, mAIN_Name,
+import PrelNames ( runMainIOName, rootMainName, mAIN,
main_RDR_Unqual )
import RdrName ( RdrName, mkRdrUnqual, emptyGlobalRdrEnv,
plusGlobalRdrEnv )
import TcHsSyn ( zonkTopDecls )
import TcExpr ( tcInferRho )
import TcRnMonad
-import TcType ( tidyTopType, isUnLiftedType )
+import TcType ( tidyTopType, tcEqType, mkTyVarTys, substTyWith )
import Inst ( showLIE )
-import TcBinds ( tcTopBinds )
+import InstEnv ( extendInstEnvList )
+import TcBinds ( tcTopBinds, tcHsBootSigs )
import TcDefaults ( tcDefaults )
import TcEnv ( tcExtendGlobalValEnv )
import TcRules ( tcRules )
import TcIface ( tcExtCoreBindings )
import TcSimplify ( tcSimplifyTop )
import TcTyClsDecls ( tcTyAndClassDecls )
-import LoadIface ( loadOrphanModules )
-import RnNames ( importsFromLocalDecls, rnImports, exportsFromAvail,
+import LoadIface ( loadOrphanModules, loadHiBootInterface )
+import RnNames ( importsFromLocalDecls, rnImports, exportsFromAvail,
reportUnusedNames, reportDeprecations )
import RnEnv ( lookupSrcOcc_maybe )
import RnSource ( rnSrcDecls, rnTyClDecls, checkModDeprec )
import PprCore ( pprIdRules, pprCoreBindings )
import CoreSyn ( IdCoreRule, bindersOfBinds )
+import DataCon ( dataConWrapId )
import ErrUtils ( Messages, mkDumpDoc, showPass )
import Id ( mkExportedLocalId, isLocalId, idName, idType )
import Var ( Var )
-import Module ( mkHomeModule, mkModuleName, moduleName, moduleEnvElts )
+import VarEnv ( varEnvElts )
+import Module ( Module, ModuleEnv, mkModule, moduleEnvElts, lookupModuleEnv )
import OccName ( mkVarOcc )
-import Name ( Name, isExternalName, getSrcLoc, getOccName )
+import Name ( Name, isExternalName, getSrcLoc, getOccName, isWiredInName )
import NameSet
-import TyCon ( tyConHasGenerics )
+import TyCon ( tyConHasGenerics, isSynTyCon, getSynTyConDefn, tyConKind )
import SrcLoc ( srcLocSpan, Located(..), noLoc )
-import Outputable
-import HscTypes ( ModGuts(..), HscEnv(..),
- GhciMode(..), Dependencies(..), noDependencies,
+import DriverPhases ( HscSource(..), isHsBoot )
+import HscTypes ( ModGuts(..), HscEnv(..), ExternalPackageState(..),
+ IsBootInterface, noDependencies,
Deprecs( NoDeprecs ), plusDeprecs,
- ForeignStubs(NoStubs), TypeEnv,
- extendTypeEnvWithIds, typeEnvIds, typeEnvTyCons,
+ ForeignStubs(NoStubs), TyThing(..),
+ TypeEnv, lookupTypeEnv, hptInstances, lookupType,
+ extendTypeEnvWithIds, typeEnvIds, typeEnvTyCons,
emptyFixityEnv
)
+import Outputable
+
#ifdef GHCI
import HsSyn ( HsStmtContext(..), Stmt(..), HsExpr(..), HsBindGroup(..),
- LStmt, LHsExpr, LHsType,
- collectStmtsBinders, mkSimpleMatch, placeHolderType,
+ LStmt, LHsExpr, LHsType, mkMatchGroup,
+ collectStmtsBinders, mkSimpleMatch,
nlLetStmt, nlExprStmt, nlBindStmt, nlResultStmt, nlVarPat )
import RdrName ( GlobalRdrEnv, mkGlobalRdrEnv, GlobalRdrElt(..),
Provenance(..), ImportSpec(..),
import TcHsSyn ( mkHsLet, zonkTopLExpr, zonkTopBndrs )
import TcHsType ( kcHsType )
import TcExpr ( tcCheckRho )
-import TcMType ( zonkTcType )
+import TcIface ( loadImportedInsts )
+import TcMType ( zonkTcType, zonkQuantifiedTyVar )
+import TcUnify ( unifyTyConApp )
import TcMatches ( tcStmtsAndThen, TcStmtCtxt(..) )
import TcSimplify ( tcSimplifyInteractive, tcSimplifyInfer )
-import TcType ( Type, mkForAllTys, mkFunTys, mkTyConApp, tyVarsOfType )
+import TcType ( Type, mkForAllTys, mkFunTys, mkTyConApp, tyVarsOfType,
+ isUnLiftedType, tyClsNamesOfDFunHead )
import TcEnv ( tcLookupTyCon, tcLookupId, tcLookupGlobal )
import RnTypes ( rnLHsType )
-import Inst ( tcStdSyntaxName )
+import Inst ( tcStdSyntaxName, tcGetInstEnvs )
+import InstEnv ( DFunId, classInstances, instEnvElts )
import RnExpr ( rnStmts, rnLExpr )
import RnNames ( exportsToAvails )
-import LoadIface ( loadSrcInterface )
+import LoadIface ( loadSrcInterface, ifaceInstGates )
import IfaceSyn ( IfaceDecl(..), IfaceClassOp(..), IfaceConDecl(..),
- IfaceExtName(..), IfaceConDecls(..),
- tyThingToIfaceDecl )
+ IfaceExtName(..), IfaceConDecls(..), IfaceInst(..),
+ tyThingToIfaceDecl, dfunToIfaceInst )
+import IfaceType ( IfaceTyCon(..), IfaceType, toIfaceType,
+ interactiveExtNameFun, isLocalIfaceExtName )
+import IfaceEnv ( lookupOrig )
import RnEnv ( lookupOccRn, dataTcOccs, lookupFixityRn )
-import Id ( Id, isImplicitId )
+import Id ( Id, isImplicitId, setIdType, globalIdDetails )
import MkId ( unsafeCoerceId )
+import DataCon ( dataConTyCon )
+import TyCon ( tyConName )
import TysWiredIn ( mkListTy, unitTy )
import IdInfo ( GlobalIdDetails(..) )
import SrcLoc ( interactiveSrcLoc, unLoc )
import Kind ( Kind )
import Var ( globaliseId )
-import Name ( nameOccName, nameModuleName )
+import Name ( nameOccName )
+import OccName ( occNameUserString )
import NameEnv ( delListFromNameEnv )
import PrelNames ( iNTERACTIVE, ioTyConName, printName, monadNames, itName, returnIOName )
-import Module ( ModuleName, lookupModuleEnvByName )
-import HscTypes ( InteractiveContext(..),
- HomeModInfo(..), typeEnvElts,
- TyThing(..), availName, availNames, icPrintUnqual,
- ModIface(..), ModDetails(..) )
+import HscTypes ( InteractiveContext(..), HomeModInfo(..), typeEnvElts, typeEnvClasses,
+ availNames, availName, ModIface(..), icPrintUnqual,
+ ModDetails(..), Dependencies(..) )
import BasicTypes ( RecFlag(..), Fixity )
import Bag ( unitBag )
+import ListSetOps ( removeDups )
import Panic ( ghcError, GhcException(..) )
+import SrcLoc ( SrcLoc )
#endif
import FastString ( mkFastString )
-import Util ( sortLt )
+import Util ( sortLe )
import Bag ( unionBags, snocBag )
import Maybe ( isJust )
\begin{code}
tcRnModule :: HscEnv
+ -> HscSource
-> Located (HsModule RdrName)
-> IO (Messages, Maybe TcGblEnv)
-tcRnModule hsc_env (L loc (HsModule maybe_mod exports
+tcRnModule hsc_env hsc_src (L loc (HsModule maybe_mod export_ies
import_decls local_decls mod_deprec))
= do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
let { this_mod = case maybe_mod of
- Nothing -> mkHomeModule mAIN_Name
- -- 'module M where' is omitted
- Just (L _ mod) -> mod } ;
- -- The normal case
+ Nothing -> mAIN -- 'module M where' is omitted
+ Just (L _ mod) -> mod } ; -- The normal case
- initTc hsc_env this_mod $
- addSrcSpan loc $
- do { -- Deal with imports; sets tcg_rdr_env, tcg_imports
+ initTc hsc_env hsc_src this_mod $
+ setSrcSpan loc $
+ do {
+ checkForPackageModule (hsc_dflags hsc_env) this_mod;
+
+ -- Deal with imports; sets tcg_rdr_env, tcg_imports
(rdr_env, imports) <- rnImports import_decls ;
- updGblEnv ( \ gbl -> gbl { tcg_rdr_env = rdr_env,
- tcg_imports = tcg_imports gbl `plusImportAvails` imports })
- $ do {
+
+ let { dep_mods :: ModuleEnv (Module, IsBootInterface)
+ ; dep_mods = imp_dep_mods imports
+
+ ; is_dep_mod :: Module -> Bool
+ ; is_dep_mod mod = case lookupModuleEnv dep_mods mod of
+ Nothing -> False
+ Just (_, is_boot) -> not is_boot
+ ; home_insts = hptInstances hsc_env is_dep_mod
+ } ;
+
+ -- Record boot-file info in the EPS, so that it's
+ -- visible to loadHiBootInterface in tcRnSrcDecls,
+ -- and any other incrementally-performed imports
+ updateEps_ (\eps -> eps { eps_is_boot = dep_mods }) ;
+
+ -- Update the gbl env
+ updGblEnv ( \ gbl ->
+ gbl { tcg_rdr_env = rdr_env,
+ tcg_inst_env = extendInstEnvList (tcg_inst_env gbl) home_insts,
+ tcg_imports = tcg_imports gbl `plusImportAvails` imports })
+ $ do {
+
traceRn (text "rn1" <+> ppr (imp_dep_mods imports)) ;
-- Fail if there are any errors so far
-- The error printing (if needed) takes advantage
traceRn (text "rn1a") ;
-- Rename and type check the declarations
- tcg_env <- tcRnSrcDecls local_decls ;
+ tcg_env <- if isHsBoot hsc_src then
+ tcRnHsBootDecls local_decls
+ else
+ tcRnSrcDecls local_decls ;
setGblEnv tcg_env $ do {
traceRn (text "rn3") ;
reportDeprecations tcg_env ;
-- Process the export list
- exports <- exportsFromAvail (isJust maybe_mod) exports ;
-
-{- Jan 04: I don't think this is necessary any more; usage info is derived from tcg_dus
- -- Get any supporting decls for the exports that have not already
- -- been sucked in for the declarations in the body of the module.
- -- (This can happen if something is imported only to be re-exported.)
- --
- -- Importing these supporting declarations is required
- -- *only* to gether usage information
- -- (see comments with MkIface.mkImportInfo for why)
- -- We don't need the results, but sucking them in may side-effect
- -- the ExternalPackageState, apart from recording usage
- mappM (tcLookupGlobal . availName) export_avails ;
--}
+ exports <- exportsFromAvail (isJust maybe_mod) export_ies ;
-- Check whether the entire module is deprecated
-- This happens only once per module
} ;
-- Report unused names
- reportUnusedNames final_env ;
+ reportUnusedNames export_ies final_env ;
-- Dump output and return
tcDump final_env ;
return final_env
}}}}
+
+-- This is really a sanity check that the user has given -package-name
+-- if necessary. -package-name is only necessary when the package database
+-- already contains the current package, because then we can't tell
+-- whether a given module is in the current package or not, without knowing
+-- the name of the current package.
+checkForPackageModule dflags this_mod
+ | not (isHomeModule dflags this_mod),
+ Just (pkg,_) <- moduleToPackageConfig dflags this_mod =
+ let
+ ppr_pkg = ppr (mkPackageId (package pkg))
+ in
+ addErr (ptext SLIT("Module") <+> quotes (ppr this_mod) <+>
+ ptext SLIT("is a member of package") <+> ppr_pkg <> char '.' $$
+ ptext SLIT("To compile this module, please use -ignore-package") <+> ppr_pkg <> char '.')
+ | otherwise = return ()
\end{code}
%************************************************************************
%* *
- The interactive interface
+ Type-checking external-core modules
%* *
%************************************************************************
\begin{code}
-#ifdef GHCI
-tcRnStmt :: HscEnv
- -> InteractiveContext
- -> LStmt RdrName
- -> IO (Maybe (InteractiveContext, [Name], LHsExpr Id))
- -- The returned [Name] is the same as the input except for
- -- ExprStmt, in which case the returned [Name] is [itName]
- --
- -- The returned TypecheckedHsExpr is of type IO [ () ],
- -- a list of the bound values, coerced to ().
+tcRnExtCore :: HscEnv
+ -> HsExtCore RdrName
+ -> IO (Messages, Maybe ModGuts)
+ -- Nothing => some error occurred
-tcRnStmt hsc_env ictxt rdr_stmt
- = initTcPrintErrors hsc_env iNTERACTIVE $
- setInteractiveContext ictxt $ do {
+tcRnExtCore hsc_env (HsExtCore this_mod decls src_binds)
+ -- The decls are IfaceDecls; all names are original names
+ = do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
- -- Rename; use CmdLineMode because tcRnStmt is only used interactively
- ([rn_stmt], fvs) <- rnStmts DoExpr [rdr_stmt] ;
- traceRn (text "tcRnStmt" <+> vcat [ppr rdr_stmt, ppr rn_stmt, ppr fvs]) ;
- failIfErrsM ;
-
- -- The real work is done here
- (bound_ids, tc_expr) <- tcUserStmt rn_stmt ;
-
- traceTc (text "tcs 1") ;
- let { -- Make all the bound ids "global" ids, now that
- -- they're notionally top-level bindings. This is
- -- important: otherwise when we come to compile an expression
- -- using these ids later, the byte code generator will consider
- -- the occurrences to be free rather than global.
- global_ids = map (globaliseId VanillaGlobal) bound_ids ;
-
- -- Update the interactive context
- rn_env = ic_rn_local_env ictxt ;
- type_env = ic_type_env ictxt ;
+ initTc hsc_env ExtCoreFile this_mod $ do {
- bound_names = map idName global_ids ;
- new_rn_env = extendLocalRdrEnv rn_env bound_names ;
+ let { ldecls = map noLoc decls } ;
- -- Remove any shadowed bindings from the type_env;
- -- they are inaccessible but might, I suppose, cause
- -- a space leak if we leave them there
- shadowed = [ n | name <- bound_names,
- let rdr_name = mkRdrUnqual (nameOccName name),
- Just n <- [lookupLocalRdrEnv rn_env rdr_name] ] ;
+ -- Deal with the type declarations; first bring their stuff
+ -- into scope, then rname them, then type check them
+ (rdr_env, imports) <- importsFromLocalDecls (mkFakeGroup ldecls) ;
- filtered_type_env = delListFromNameEnv type_env shadowed ;
- new_type_env = extendTypeEnvWithIds filtered_type_env global_ids ;
+ updGblEnv (\gbl -> gbl { tcg_rdr_env = rdr_env `plusGlobalRdrEnv` tcg_rdr_env gbl,
+ tcg_imports = imports `plusImportAvails` tcg_imports gbl })
+ $ do {
- new_ic = ictxt { ic_rn_local_env = new_rn_env,
- ic_type_env = new_type_env }
- } ;
+ rn_decls <- rnTyClDecls ldecls ;
+ failIfErrsM ;
- dumpOptTcRn Opt_D_dump_tc
- (vcat [text "Bound Ids" <+> pprWithCommas ppr global_ids,
- text "Typechecked expr" <+> ppr tc_expr]) ;
+ -- Dump trace of renaming part
+ rnDump (ppr rn_decls) ;
- returnM (new_ic, bound_names, tc_expr)
- }
-\end{code}
+ -- Typecheck them all together so that
+ -- any mutually recursive types are done right
+ tcg_env <- checkNoErrs (tcTyAndClassDecls [{- no boot names -}] rn_decls) ;
+ -- Make the new type env available to stuff slurped from interface files
+ setGblEnv tcg_env $ do {
+
+ -- Now the core bindings
+ core_binds <- initIfaceExtCore (tcExtCoreBindings src_binds) ;
-Here is the grand plan, implemented in tcUserStmt
+ -- Wrap up
+ let {
+ bndrs = bindersOfBinds core_binds ;
+ my_exports = mkNameSet (map idName bndrs) ;
+ -- ToDo: export the data types also?
- 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,...]
+ final_type_env = extendTypeEnvWithIds (tcg_type_env tcg_env) bndrs ;
- pat <- expr ==> expr >>= \ pat -> return [coerce HVal x, coerce HVal y, ...]
- bindings: [x,y,...]
+ mod_guts = ModGuts { mg_module = this_mod,
+ mg_boot = False,
+ mg_usages = [], -- ToDo: compute usage
+ mg_dir_imps = [], -- ??
+ mg_deps = noDependencies, -- ??
+ mg_exports = my_exports,
+ mg_types = final_type_env,
+ mg_insts = tcg_insts tcg_env,
+ mg_rules = [],
+ mg_binds = core_binds,
- expr (of IO type) ==> expr >>= \ it -> return [coerce HVal it]
- [NB: result not printed] bindings: [it]
-
- expr (of non-IO type, ==> let it = expr in print it >> return [coerce HVal it]
- result showable) bindings: [it]
+ -- Stubs
+ mg_rdr_env = emptyGlobalRdrEnv,
+ mg_fix_env = emptyFixityEnv,
+ mg_deprecs = NoDeprecs,
+ mg_foreign = NoStubs
+ } } ;
- expr (of non-IO type,
- result not showable) ==> error
+ tcCoreDump mod_guts ;
+ return mod_guts
+ }}}}
-\begin{code}
----------------------------
-tcUserStmt :: LStmt Name -> TcM ([Id], LHsExpr Id)
-tcUserStmt (L _ (ExprStmt expr _))
- = newUnique `thenM` \ uniq ->
- let
- fresh_it = itName uniq
- the_bind = noLoc $ FunBind (noLoc fresh_it) False
- [ mkSimpleMatch [] expr placeHolderType ]
- in
- tryTcLIE_ (do { -- Try this if the other fails
- traceTc (text "tcs 1b") ;
- tc_stmts [
- nlLetStmt [HsBindGroup (unitBag the_bind) [] NonRecursive],
- nlExprStmt (nlHsApp (nlHsVar printName)
- (nlHsVar fresh_it))
- ] })
- (do { -- Try this first
- traceTc (text "tcs 1a") ;
- tc_stmts [nlBindStmt (nlVarPat fresh_it) expr] })
+mkFakeGroup decls -- Rather clumsy; lots of unused fields
+ = HsGroup { hs_tyclds = decls, -- This is the one we want
+ hs_valds = [], hs_fords = [],
+ hs_instds = [], hs_fixds = [], hs_depds = [],
+ hs_ruleds = [], hs_defds = [] }
+\end{code}
-tcUserStmt stmt = tc_stmts [stmt]
----------------------------
-tc_stmts stmts
- = do { ioTyCon <- tcLookupTyCon ioTyConName ;
- let {
- ret_ty = mkListTy unitTy ;
- io_ret_ty = mkTyConApp ioTyCon [ret_ty] ;
+%************************************************************************
+%* *
+ Type-checking the top level of a module
+%* *
+%************************************************************************
- names = map unLoc (collectStmtsBinders stmts) ;
+\begin{code}
+tcRnSrcDecls :: [LHsDecl RdrName] -> TcM TcGblEnv
+ -- Returns the variables free in the decls
+ -- Reason: solely to report unused imports and bindings
+tcRnSrcDecls decls
+ = do { -- Load the hi-boot interface for this module, if any
+ -- We do this now so that the boot_names can be passed
+ -- to tcTyAndClassDecls, because the boot_names are
+ -- automatically considered to be loop breakers
+ boot_names <- loadHiBootInterface ;
- stmt_ctxt = SC { sc_what = DoExpr,
- sc_rhs = check_rhs,
- sc_body = check_body,
- sc_ty = ret_ty } ;
+ -- Do all the declarations
+ (tc_envs, lie) <- getLIE (tc_rn_src_decls boot_names decls) ;
- check_rhs rhs rhs_ty = tcCheckRho rhs (mkTyConApp ioTyCon [rhs_ty]) ;
- check_body body = tcCheckRho body io_ret_ty ;
+ -- tcSimplifyTop deals 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.)
+ traceTc (text "Tc8") ;
+ inst_binds <- setEnvs tc_envs (tcSimplifyTop lie) ;
+ -- Setting the global env exposes the instances to tcSimplifyTop
+ -- Setting the local env exposes the local Ids to tcSimplifyTop,
+ -- so that we get better error messages (monomorphism restriction)
- -- 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 = nlHsApp (noLoc $ TyApp (nlHsVar ret_id) [ret_ty])
- (noLoc $ ExplicitList unitTy (map mk_item ids)) ;
- mk_item id = nlHsApp (noLoc $ TyApp (nlHsVar unsafeCoerceId) [idType id, unitTy])
- (nlHsVar id) ;
+ -- Backsubstitution. This must be done last.
+ -- Even tcSimplifyTop may do some unification.
+ traceTc (text "Tc9") ;
+ let { (tcg_env, _) = tc_envs ;
+ TcGblEnv { tcg_type_env = type_env, tcg_binds = binds,
+ tcg_rules = rules, tcg_fords = fords } = tcg_env } ;
- io_ty = mkTyConApp ioTyCon []
- } ;
+ (bind_ids, binds', fords', rules') <- zonkTopDecls (binds `unionBags` inst_binds)
+ rules fords ;
- -- 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 stmts $
- do {
- -- Look up the names right in the middle,
- -- where they will all be in scope
- ids <- mappM tcLookupId names ;
- ret_id <- tcLookupId returnIOName ; -- return @ IO
- return (ids, [nlResultStmt (mk_return ret_id ids)]) } ;
+ let { final_type_env = extendTypeEnvWithIds type_env bind_ids } ;
- io_ids <- mappM (tcStdSyntaxName DoOrigin io_ty) monadNames ;
- return (ids, noLoc (HsDo DoExpr tc_stmts io_ids io_ret_ty))
- } ;
+ -- Compre the hi-boot iface (if any) with the real thing
+ checkHiBootIface final_type_env boot_names ;
- -- Simplify the context right here, so that we fail
- -- if there aren't enough instances. Notably, when we see
- -- e
- -- we use recoverTc_ to try it <- e
- -- and then let it = e
- -- It's the simplify step that rejects the first.
- traceTc (text "tcs 3") ;
- const_binds <- tcSimplifyInteractive lie ;
+ -- Make the new type env available to stuff slurped from interface files
+ writeMutVar (tcg_type_env_var tcg_env) final_type_env ;
- -- Build result expression and zonk it
- let { expr = mkHsLet const_binds tc_expr } ;
- zonked_expr <- zonkTopLExpr expr ;
- zonked_ids <- zonkTopBndrs ids ;
+ return (tcg_env { tcg_type_env = final_type_env,
+ tcg_binds = binds', tcg_rules = rules', tcg_fords = fords' })
+ }
- -- None of the Ids should be of unboxed type, because we
- -- cast them all to HValues in the end!
- mappM bad_unboxed (filter (isUnLiftedType . idType) zonked_ids) ;
+tc_rn_src_decls :: [Name] -> [LHsDecl RdrName] -> TcM (TcGblEnv, TcLclEnv)
+-- 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_names ds
+ = do { let { (first_group, group_tail) = findSplice ds } ;
+ -- If ds is [] we get ([], Nothing)
- return (zonked_ids, zonked_expr)
- }
- where
- combine stmt (ids, stmts) = (ids, stmt:stmts)
- bad_unboxed id = addErr (sep [ptext SLIT("GHCi can't bind a variable of unlifted type:"),
- nest 2 (ppr id <+> dcolon <+> ppr (idType id))])
-\end{code}
+ -- Type check the decls up to, but not including, the first splice
+ tc_envs@(tcg_env,tcl_env) <- tcRnGroup boot_names first_group ;
+ -- Bale out if errors; for example, error recovery when checking
+ -- the RHS of 'main' can mean that 'main' is not in the envt for
+ -- the subsequent checkMain test
+ failIfErrsM ;
-tcRnExpr just finds the type of an expression
+ setEnvs tc_envs $
-\begin{code}
-tcRnExpr :: HscEnv
- -> InteractiveContext
- -> LHsExpr RdrName
- -> IO (Maybe Type)
-tcRnExpr hsc_env ictxt rdr_expr
- = initTcPrintErrors hsc_env iNTERACTIVE $
- setInteractiveContext ictxt $ do {
-
- (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) ;
- ((qtvs, _, dict_ids), lie_top) <- getLIE (tcSimplifyInfer smpl_doc (tyVarsOfType res_ty) lie) ;
- tcSimplifyInteractive lie_top ;
-
- let { all_expr_ty = mkForAllTys qtvs $
- mkFunTys (map idType dict_ids) $
- res_ty } ;
- zonkTcType all_expr_ty
- }
- where
- smpl_doc = ptext SLIT("main expression")
-\end{code}
-
-tcRnExpr just finds the kind of a type
-
-\begin{code}
-tcRnType :: HscEnv
- -> InteractiveContext
- -> LHsType RdrName
- -> IO (Maybe Kind)
-tcRnType hsc_env ictxt rdr_type
- = initTcPrintErrors hsc_env iNTERACTIVE $
- setInteractiveContext ictxt $ do {
-
- rn_type <- rnLHsType doc rdr_type ;
- failIfErrsM ;
-
- -- Now kind-check the type
- (ty', kind) <- kcHsType rn_type ;
- return kind
- }
- where
- doc = ptext SLIT("In GHCi input")
-\end{code}
-
-\begin{code}
-tcRnThing :: HscEnv
- -> InteractiveContext
- -> RdrName
- -> IO (Maybe [(IfaceDecl, Fixity)])
--- Look up a RdrName and return all the TyThings it might be
--- 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 ictxt rdr_name
- = initTcPrintErrors hsc_env iNTERACTIVE $
- setInteractiveContext ictxt $ do {
-
- -- If the identifier is a constructor (begins with an
- -- upper-case letter), then we need to consider both
- -- constructor and type class identifiers.
- let { rdr_names = dataTcOccs rdr_name } ;
-
- -- results :: [(Messages, Maybe Name)]
- results <- mapM (tryTc . lookupOccRn) rdr_names ;
+ -- If there is no splice, we're nearly done
+ case group_tail of {
+ Nothing -> do { -- Last thing: check for `main'
+ tcg_env <- checkMain ;
+ return (tcg_env, tcl_env)
+ } ;
- -- The successful lookups will be (Just name)
- let { (warns_s, good_names) = unzip [ (msgs, name)
- | (msgs, Just name) <- results] ;
- errs_s = [msgs | (msgs, Nothing) <- results] } ;
+ -- If there's a splice, we must carry on
+ Just (SpliceDecl splice_expr, rest_ds) -> do {
+#ifndef GHCI
+ failWithTc (text "Can't do a top-level splice; need a bootstrapped compiler")
+#else
- -- Fail if nothing good happened, else add warnings
- 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 ;
-
- -- And lookup up the entities
- mapM do_one good_names
- }
- where
- do_one name = do { thing <- tcLookupGlobal name
- ; fixity <- lookupFixityRn name
- ; return (toIfaceDecl ictxt thing, fixity) }
-
-toIfaceDecl :: InteractiveContext -> TyThing -> IfaceDecl
-toIfaceDecl ictxt thing
- = tyThingToIfaceDecl True {- Discard IdInfo -} emptyNameSet {- Show data cons -}
- ext_nm thing
- where
- unqual = icPrintUnqual ictxt
- ext_nm n | unqual n = LocalTop (nameOccName n) -- What a hack
- | otherwise = ExtPkg (nameModuleName n) (nameOccName n)
-\end{code}
+ -- Rename the splice expression, and get its supporting decls
+ (rn_splice_expr, splice_fvs) <- rnLExpr splice_expr ;
+ failIfErrsM ; -- Don't typecheck if renaming failed
+ -- Execute the splice
+ spliced_decls <- tcSpliceDecls rn_splice_expr ;
-\begin{code}
-setInteractiveContext :: InteractiveContext -> TcRn a -> TcRn a
-setInteractiveContext icxt thing_inside
- = traceTc (text "setIC" <+> ppr (ic_type_env icxt)) `thenM_`
- (updGblEnv (\env -> env {tcg_rdr_env = ic_rn_gbl_env icxt,
- tcg_type_env = ic_type_env icxt}) $
- updLclEnv (\env -> env {tcl_rdr = ic_rn_local_env icxt}) $
- thing_inside)
+ -- Glue them on the front of the remaining decls and loop
+ setGblEnv (tcg_env `addTcgDUs` usesOnly splice_fvs) $
+ tc_rn_src_decls boot_names (spliced_decls ++ rest_ds)
#endif /* GHCI */
+ }}}
\end{code}
%************************************************************************
%* *
- Type-checking external-core modules
+ Compiling hs-boot source files, and
+ comparing the hi-boot interface with the real thing
%* *
%************************************************************************
\begin{code}
-tcRnExtCore :: HscEnv
- -> HsExtCore RdrName
- -> IO (Messages, Maybe ModGuts)
- -- Nothing => some error occurred
-
-tcRnExtCore hsc_env (HsExtCore this_mod decls src_binds)
- -- The decls are IfaceDecls; all names are original names
- = do { showPass (hsc_dflags hsc_env) "Renamer/typechecker" ;
-
- initTc hsc_env this_mod $ do {
-
- let { ldecls = map noLoc decls } ;
-
- -- Deal with the type declarations; first bring their stuff
- -- into scope, then rname them, then type check them
- (rdr_env, imports) <- importsFromLocalDecls (mkFakeGroup ldecls) ;
-
- updGblEnv (\gbl -> gbl { tcg_rdr_env = rdr_env `plusGlobalRdrEnv` tcg_rdr_env gbl,
- tcg_imports = imports `plusImportAvails` tcg_imports gbl })
- $ do {
-
- rn_decls <- rnTyClDecls ldecls ;
- failIfErrsM ;
-
- -- Dump trace of renaming part
- rnDump (ppr rn_decls) ;
-
- -- Typecheck them all together so that
- -- any mutually recursive types are done right
- tcg_env <- checkNoErrs (tcTyAndClassDecls rn_decls) ;
- -- Make the new type env available to stuff slurped from interface files
+tcRnHsBootDecls :: [LHsDecl RdrName] -> TcM TcGblEnv
+tcRnHsBootDecls decls
+ = do { let { (first_group, group_tail) = findSplice decls }
- setGblEnv tcg_env $ do {
-
- -- Now the core bindings
- core_binds <- initIfaceExtCore (tcExtCoreBindings this_mod src_binds) ;
+ ; case group_tail of
+ Just stuff -> spliceInHsBootErr stuff
+ Nothing -> return ()
- -- Wrap up
- let {
- bndrs = bindersOfBinds core_binds ;
- my_exports = mkNameSet (map idName bndrs) ;
- -- ToDo: export the data types also?
+ -- Rename the declarations
+ ; (tcg_env, rn_group) <- rnTopSrcDecls first_group
+ ; setGblEnv tcg_env $ do {
- final_type_env = extendTypeEnvWithIds (tcg_type_env tcg_env) bndrs ;
+ -- Todo: check no foreign decls, no rules, no default decls
- mod_guts = ModGuts { mg_module = this_mod,
- mg_usages = [], -- ToDo: compute usage
- mg_dir_imps = [], -- ??
- mg_deps = noDependencies, -- ??
- mg_exports = my_exports,
- mg_types = final_type_env,
- mg_insts = tcg_insts tcg_env,
- mg_rules = [],
- mg_binds = core_binds,
+ -- Typecheck type/class decls
+ ; traceTc (text "Tc2")
+ ; let tycl_decls = hs_tyclds rn_group
+ ; tcg_env <- checkNoErrs (tcTyAndClassDecls [{- no boot_names -}] tycl_decls)
+ ; setGblEnv tcg_env $ do {
- -- Stubs
- mg_rdr_env = emptyGlobalRdrEnv,
- mg_fix_env = emptyFixityEnv,
- mg_deprecs = NoDeprecs,
- mg_foreign = NoStubs
- } } ;
+ -- Typecheck instance decls
+ ; traceTc (text "Tc3")
+ ; (tcg_env, inst_infos, _binds) <- tcInstDecls1 tycl_decls (hs_instds rn_group)
+ ; setGblEnv tcg_env $ do {
- tcCoreDump mod_guts ;
+ -- Typecheck value declarations
+ ; traceTc (text "Tc5")
+ ; new_ids <- tcHsBootSigs (hs_valds rn_group)
- return mod_guts
+ -- Wrap up
+ -- No simplification or zonking to do
+ ; traceTc (text "Tc7a")
+ ; gbl_env <- getGblEnv
+
+ ; let { final_type_env = extendTypeEnvWithIds (tcg_type_env gbl_env) new_ids }
+ ; return (gbl_env { tcg_type_env = final_type_env })
}}}}
-mkFakeGroup decls -- Rather clumsy; lots of unused fields
- = HsGroup { hs_tyclds = decls, -- This is the one we want
- hs_valds = [], hs_fords = [],
- hs_instds = [], hs_fixds = [], hs_depds = [],
- hs_ruleds = [], hs_defds = [] }
+spliceInHsBootErr (SpliceDecl (L loc _), _)
+ = addErrAt loc (ptext SLIT("Splices are not allowed in hs-boot files"))
\end{code}
-
-%************************************************************************
-%* *
- Type-checking the top level of a module
-%* *
-%************************************************************************
+In both one-shot mode and GHCi mode, hi-boot interfaces are demand-loaded
+into the External Package Table. Once we've typechecked the body of the
+module, we want to compare what we've found (gathered in a TypeEnv) with
+the hi-boot stuff in the EPT. We do so here, using the export list of
+the hi-boot interface as our checklist.
\begin{code}
-tcRnSrcDecls :: [LHsDecl RdrName] -> TcM TcGblEnv
- -- Returns the variables free in the decls
- -- Reason: solely to report unused imports and bindings
-tcRnSrcDecls decls
- = do { -- Do all the declarations
- (tc_envs, lie) <- getLIE (tc_rn_src_decls decls) ;
-
- -- tcSimplifyTop deals 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.)
- traceTc (text "Tc8") ;
- inst_binds <- setEnvs tc_envs (tcSimplifyTop lie) ;
- -- Setting the global env exposes the instances to tcSimplifyTop
- -- Setting the local env exposes the local Ids to tcSimplifyTop,
- -- so that we get better error messages (monomorphism restriction)
-
- -- Backsubstitution. This must be done last.
- -- Even tcSimplifyTop may do some unification.
- traceTc (text "Tc9") ;
- let { (tcg_env, _) = tc_envs ;
- TcGblEnv { tcg_type_env = type_env, tcg_binds = binds,
- tcg_rules = rules, tcg_fords = fords } = tcg_env } ;
-
- (bind_ids, binds', fords', rules') <- zonkTopDecls (binds `unionBags` inst_binds)
- rules fords ;
-
- let { final_type_env = extendTypeEnvWithIds type_env bind_ids } ;
-
- -- Make the new type env available to stuff slurped from interface files
- writeMutVar (tcg_type_env_var tcg_env) final_type_env ;
-
- return (tcg_env { tcg_type_env = final_type_env,
- tcg_binds = binds', tcg_rules = rules', tcg_fords = fords' })
- }
-
-tc_rn_src_decls :: [LHsDecl RdrName] -> TcM (TcGblEnv, TcLclEnv)
--- Loops around dealing with each top level inter-splice group
--- in turn, until it's dealt with the entire module
-tc_rn_src_decls ds
- = do { let { (first_group, group_tail) = findSplice ds } ;
- -- If ds is [] we get ([], Nothing)
-
- -- Type check the decls up to, but not including, the first splice
- tc_envs@(tcg_env,tcl_env) <- tcRnGroup first_group ;
-
- -- Bale out if errors; for example, error recovery when checking
- -- the RHS of 'main' can mean that 'main' is not in the envt for
- -- the subsequent checkMain test
- failIfErrsM ;
-
- setEnvs tc_envs $
+checkHiBootIface :: TypeEnv -> [Name] -> TcM ()
+-- Compare the hi-boot file for this module (if there is one)
+-- with the type environment we've just come up with
+-- In the common case where there is no hi-boot file, the list
+-- of boot_names is empty.
+checkHiBootIface env boot_names
+ = mapM_ (check_one env) boot_names
+
+----------------
+check_one local_env name
+ | isWiredInName name -- No checking for wired-in names. In particular, 'error'
+ = return () -- is handled by a rather gross hack (see comments in GHC.Err.hs-boot)
+ | otherwise
+ = do { (eps,hpt) <- getEpsAndHpt
+
+ -- Look up the hi-boot one;
+ -- it should jolly well be there (else GHC bug)
+ ; case lookupType hpt (eps_PTE eps) name of {
+ Nothing -> pprPanic "checkHiBootIface" (ppr name) ;
+ Just boot_thing ->
+
+ -- Look it up in the local type env
+ -- It should be there, but it's a programmer error if not
+ case lookupTypeEnv local_env name of
+ Nothing -> addErrTc (missingBootThing boot_thing)
+ Just real_thing -> check_thing boot_thing real_thing
+ } }
+
+----------------
+check_thing (ATyCon boot_tc) (ATyCon real_tc)
+ | isSynTyCon boot_tc && isSynTyCon real_tc,
+ defn1 `tcEqType` substTyWith tvs2 (mkTyVarTys tvs1) defn2
+ = return ()
+
+ | tyConKind boot_tc == tyConKind real_tc
+ = return ()
+ where
+ (tvs1, defn1) = getSynTyConDefn boot_tc
+ (tvs2, defn2) = getSynTyConDefn boot_tc
- -- If there is no splice, we're nearly done
- case group_tail of {
- Nothing -> do { -- Last thing: check for `main'
- tcg_env <- checkMain ;
- return (tcg_env, tcl_env)
- } ;
+check_thing (AnId boot_id) (AnId real_id)
+ | idType boot_id `tcEqType` idType real_id
+ = return ()
- -- If there's a splice, we must carry on
- Just (SpliceDecl splice_expr, rest_ds) -> do {
-#ifndef GHCI
- failWithTc (text "Can't do a top-level splice; need a bootstrapped compiler")
-#else
+check_thing (ADataCon dc1) (ADataCon dc2)
+ | idType (dataConWrapId dc1) `tcEqType` idType (dataConWrapId dc2)
+ = return ()
- -- Rename the splice expression, and get its supporting decls
- (rn_splice_expr, splice_fvs) <- rnLExpr splice_expr ;
- failIfErrsM ; -- Don't typecheck if renaming failed
+ -- Can't declare a class in a hi-boot file
- -- Execute the splice
- spliced_decls <- tcSpliceDecls rn_splice_expr ;
+check_thing boot_thing real_thing -- Default case; failure
+ = addErrAt (srcLocSpan (getSrcLoc real_thing))
+ (bootMisMatch real_thing)
- -- Glue them on the front of the remaining decls and loop
- setGblEnv (tcg_env `addTcgDUs` usesOnly splice_fvs) $
- tc_rn_src_decls (spliced_decls ++ rest_ds)
-#endif /* GHCI */
- }}}
+----------------
+missingBootThing thing
+ = ppr thing <+> ptext SLIT("is defined in the hs-boot file, but not in the module")
+bootMisMatch thing
+ = ppr thing <+> ptext SLIT("has conflicting definitions in the module and its hs-boot file")
\end{code}
monad; it augments it and returns the new TcGblEnv.
\begin{code}
-tcRnGroup :: HsGroup RdrName -> TcM (TcGblEnv, TcLclEnv)
+tcRnGroup :: [Name] -> HsGroup RdrName -> TcM (TcGblEnv, TcLclEnv)
-- Returns the variables free in the decls, for unused-binding reporting
-tcRnGroup decls
+tcRnGroup boot_names decls
= do { -- Rename the declarations
(tcg_env, rn_decls) <- rnTopSrcDecls decls ;
setGblEnv tcg_env $ do {
-- Typecheck the declarations
- tcTopSrcDecls rn_decls
+ tcTopSrcDecls boot_names rn_decls
}}
------------------------------------------------
}}
------------------------------------------------
-tcTopSrcDecls :: HsGroup Name -> TcM (TcGblEnv, TcLclEnv)
-tcTopSrcDecls
+tcTopSrcDecls :: [Name] -> HsGroup Name -> TcM (TcGblEnv, TcLclEnv)
+tcTopSrcDecls boot_names
(HsGroup { hs_tyclds = tycl_decls,
hs_instds = inst_decls,
hs_fords = foreign_decls,
-- The latter come in via tycl_decls
traceTc (text "Tc2") ;
- tcg_env <- checkNoErrs (tcTyAndClassDecls tycl_decls) ;
+ tcg_env <- checkNoErrs (tcTyAndClassDecls boot_names tycl_decls) ;
-- tcTyAndClassDecls recovers internally, but if anything gave rise to
-- an error we'd better stop now, to avoid a cascade
\end{code}
-%*********************************************************
-%* *
- mkGlobalContext: make up an interactive context
-
- Used for initialising the lexical environment
- of the interactive read-eval-print loop
-%* *
-%*********************************************************
+%************************************************************************
+%* *
+ Checking for 'main'
+%* *
+%************************************************************************
\begin{code}
-#ifdef GHCI
-mkExportEnv :: HscEnv -> [ModuleName] -- Expose these modules' exports only
- -> IO GlobalRdrEnv
+checkMain
+ = do { ghci_mode <- getGhciMode ;
+ tcg_env <- getGblEnv ;
+ dflags <- getDOpts ;
+ let { main_mod = case mainModIs dflags of {
+ Just mod -> mkModule mod ;
+ Nothing -> mAIN } ;
+ main_fn = case mainFunIs dflags of {
+ Just fn -> mkRdrUnqual (mkVarOcc (mkFastString fn)) ;
+ Nothing -> main_RDR_Unqual } } ;
+
+ check_main ghci_mode tcg_env main_mod main_fn
+ }
-mkExportEnv hsc_env exports
- = do { mb_envs <- initTcPrintErrors hsc_env iNTERACTIVE $
+
+check_main ghci_mode tcg_env main_mod main_fn
+ -- If we are in module Main, check that 'main' is defined.
+ -- It may be imported from another module!
+ --
+ --
+ -- Blimey: a whole page of code to do this...
+ | mod /= main_mod
+ = return tcg_env
+
+ | otherwise
+ = addErrCtxt mainCtxt $
+ do { mb_main <- lookupSrcOcc_maybe main_fn
+ -- Check that 'main' is in scope
+ -- It might be imported from another module!
+ ; case mb_main of {
+ Nothing -> do { complain_no_main
+ ; return tcg_env } ;
+ Just main_name -> do
+ { let { rhs = nlHsApp (nlHsVar runMainIOName) (nlHsVar main_name) }
+ -- :Main.main :: IO () = runMainIO main
+
+ ; (main_expr, ty) <- setSrcSpan (srcLocSpan (getSrcLoc main_name)) $
+ tcInferRho rhs
+
+ ; let { root_main_id = mkExportedLocalId rootMainName ty ;
+ main_bind = noLoc (VarBind root_main_id main_expr) }
+
+ ; return (tcg_env { 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
+
+ complain_no_main | ghci_mode == Interactive = return ()
+ | otherwise = failWithTc noMainMsg
+ -- In interactive mode, don't worry about the absence of 'main'
+ -- In other modes, fail altogether, so that we don't go on
+ -- and complain a second time when processing the export list.
+
+ mainCtxt = ptext SLIT("When checking the type of the main function") <+> quotes (ppr main_fn)
+ noMainMsg = ptext SLIT("The main function") <+> quotes (ppr main_fn)
+ <+> ptext SLIT("is not defined in module") <+> quotes (ppr main_mod)
+\end{code}
+
+
+%*********************************************************
+%* *
+ GHCi stuff
+%* *
+%*********************************************************
+
+\begin{code}
+#ifdef GHCI
+setInteractiveContext :: HscEnv -> InteractiveContext -> TcRn a -> TcRn a
+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
+ dfuns = hptInstances hsc_env (\mod -> True)
+ in
+ updGblEnv (\env -> env {
+ tcg_rdr_env = ic_rn_gbl_env icxt,
+ tcg_type_env = ic_type_env icxt,
+ tcg_inst_env = extendInstEnvList (tcg_inst_env env) dfuns }) $
+
+ updLclEnv (\env -> env { tcl_rdr = ic_rn_local_env icxt }) $
+
+ do { traceTc (text "setIC" <+> ppr (ic_type_env icxt))
+ ; thing_inside }
+\end{code}
+
+
+\begin{code}
+tcRnStmt :: HscEnv
+ -> InteractiveContext
+ -> LStmt RdrName
+ -> IO (Maybe (InteractiveContext, [Name], LHsExpr Id))
+ -- The returned [Name] is the same as the input except for
+ -- ExprStmt, in which case the returned [Name] is [itName]
+ --
+ -- The returned TypecheckedHsExpr is of type IO [ () ],
+ -- a list of the bound values, coerced to ().
+
+tcRnStmt hsc_env ictxt rdr_stmt
+ = initTcPrintErrors hsc_env iNTERACTIVE $
+ setInteractiveContext hsc_env ictxt $ do {
+
+ -- Rename; use CmdLineMode because tcRnStmt is only used interactively
+ ([rn_stmt], fvs) <- rnStmts DoExpr [rdr_stmt] ;
+ traceRn (text "tcRnStmt" <+> vcat [ppr rdr_stmt, ppr rn_stmt, ppr fvs]) ;
+ failIfErrsM ;
+
+ -- The real work is done here
+ (bound_ids, tc_expr) <- tcUserStmt rn_stmt ;
+
+ traceTc (text "tcs 1") ;
+ let { -- (a) Make all the bound ids "global" ids, now that
+ -- they're notionally top-level bindings. This is
+ -- important: otherwise when we come to compile an expression
+ -- using these ids later, the byte code generator will consider
+ -- the occurrences to be free rather than global.
+ --
+ -- (b) Tidy their types; this is important, because :info may
+ -- ask to look at them, and :info expects the things it looks
+ -- up to have tidy types
+ global_ids = map globaliseAndTidy bound_ids ;
+
+ -- Update the interactive context
+ rn_env = ic_rn_local_env ictxt ;
+ type_env = ic_type_env ictxt ;
+
+ bound_names = map idName global_ids ;
+ new_rn_env = extendLocalRdrEnv rn_env bound_names ;
+
+ -- Remove any shadowed bindings from the type_env;
+ -- they are inaccessible but might, I suppose, cause
+ -- a space leak if we leave them there
+ shadowed = [ n | name <- bound_names,
+ let rdr_name = mkRdrUnqual (nameOccName name),
+ Just n <- [lookupLocalRdrEnv rn_env rdr_name] ] ;
+
+ filtered_type_env = delListFromNameEnv type_env shadowed ;
+ new_type_env = extendTypeEnvWithIds filtered_type_env global_ids ;
+
+ new_ic = ictxt { ic_rn_local_env = new_rn_env,
+ ic_type_env = new_type_env }
+ } ;
+
+ dumpOptTcRn Opt_D_dump_tc
+ (vcat [text "Bound Ids" <+> pprWithCommas ppr global_ids,
+ text "Typechecked expr" <+> ppr tc_expr]) ;
+
+ returnM (new_ic, bound_names, tc_expr)
+ }
+
+globaliseAndTidy :: Id -> Id
+globaliseAndTidy id
+-- Give the Id a Global Name, and tidy its type
+ = setIdType (globaliseId VanillaGlobal id) tidy_type
+ where
+ tidy_type = tidyTopType (idType id)
+\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 >>= \ it -> return [coerce HVal it]
+ [NB: result not printed] bindings: [it]
+
+ expr (of non-IO type, ==> let it = expr in print it >> return [coerce HVal it]
+ result showable) bindings: [it]
+
+ expr (of non-IO type,
+ result not showable) ==> error
+
+
+\begin{code}
+---------------------------
+tcUserStmt :: LStmt Name -> TcM ([Id], LHsExpr Id)
+tcUserStmt (L _ (ExprStmt expr _))
+ = newUnique `thenM` \ uniq ->
+ let
+ fresh_it = itName uniq
+ the_bind = noLoc $ FunBind (noLoc fresh_it) False
+ (mkMatchGroup [mkSimpleMatch [] expr])
+ in
+ tryTcLIE_ (do { -- Try this if the other fails
+ traceTc (text "tcs 1b") ;
+ tc_stmts [
+ nlLetStmt [HsBindGroup (unitBag the_bind) [] NonRecursive],
+ nlExprStmt (nlHsApp (nlHsVar printName)
+ (nlHsVar fresh_it))
+ ] })
+ (do { -- Try this first
+ traceTc (text "tcs 1a") ;
+ tc_stmts [nlBindStmt (nlVarPat fresh_it) expr] })
+
+tcUserStmt stmt = tc_stmts [stmt]
+
+---------------------------
+tc_stmts stmts
+ = do { ioTyCon <- tcLookupTyCon ioTyConName ;
+ let {
+ ret_ty = mkListTy unitTy ;
+ io_ret_ty = mkTyConApp ioTyCon [ret_ty] ;
+
+ names = map unLoc (collectStmtsBinders stmts) ;
+
+ stmt_ctxt = SC { sc_what = DoExpr,
+ sc_rhs = infer_rhs,
+ sc_body = check_body,
+ sc_ty = ret_ty } ;
+
+ infer_rhs rhs = do { (rhs', rhs_ty) <- tcInferRho rhs
+ ; [pat_ty] <- unifyTyConApp ioTyCon rhs_ty
+ ; return (rhs', pat_ty) } ;
+ check_body body = tcCheckRho body io_ret_ty ;
+
+ -- 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 = nlHsApp (noLoc $ TyApp (nlHsVar ret_id) [ret_ty])
+ (noLoc $ ExplicitList unitTy (map mk_item ids)) ;
+ mk_item id = nlHsApp (noLoc $ TyApp (nlHsVar unsafeCoerceId) [idType id, unitTy])
+ (nlHsVar 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 stmts $
+ do {
+ -- Look up the names right in the middle,
+ -- where they will all be in scope
+ ids <- mappM tcLookupId names ;
+ ret_id <- tcLookupId returnIOName ; -- return @ IO
+ return (ids, [nlResultStmt (mk_return ret_id ids)]) } ;
+
+ io_ids <- mappM (tcStdSyntaxName DoOrigin io_ty) monadNames ;
+ return (ids, noLoc (HsDo DoExpr tc_stmts io_ids io_ret_ty))
+ } ;
+
+ -- Simplify the context right here, so that we fail
+ -- if there aren't enough instances. Notably, when we see
+ -- e
+ -- we use recoverTc_ to try it <- e
+ -- and then let it = e
+ -- It's the simplify step that rejects the first.
+ traceTc (text "tcs 3") ;
+ const_binds <- tcSimplifyInteractive lie ;
+
+ -- Build result expression and zonk it
+ let { expr = mkHsLet const_binds tc_expr } ;
+ zonked_expr <- zonkTopLExpr expr ;
+ zonked_ids <- zonkTopBndrs ids ;
+
+ -- None of the Ids should be of unboxed type, because we
+ -- cast them all to HValues in the end!
+ mappM bad_unboxed (filter (isUnLiftedType . idType) zonked_ids) ;
+
+ return (zonked_ids, zonked_expr)
+ }
+ where
+ combine stmt (ids, stmts) = (ids, stmt:stmts)
+ bad_unboxed id = addErr (sep [ptext SLIT("GHCi can't bind a variable of unlifted type:"),
+ nest 2 (ppr id <+> dcolon <+> ppr (idType id))])
+\end{code}
+
+
+tcRnExpr just finds the type of an expression
+
+\begin{code}
+tcRnExpr :: HscEnv
+ -> InteractiveContext
+ -> LHsExpr RdrName
+ -> IO (Maybe Type)
+tcRnExpr hsc_env ictxt rdr_expr
+ = initTcPrintErrors hsc_env iNTERACTIVE $
+ setInteractiveContext hsc_env ictxt $ do {
+
+ (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) ;
+ ((qtvs, _, dict_ids), lie_top) <- getLIE (tcSimplifyInfer smpl_doc (tyVarsOfType res_ty) lie) ;
+ tcSimplifyInteractive lie_top ;
+ qtvs' <- mappM zonkQuantifiedTyVar qtvs ;
+
+ let { all_expr_ty = mkForAllTys qtvs' $
+ mkFunTys (map idType dict_ids) $
+ res_ty } ;
+ zonkTcType all_expr_ty
+ }
+ where
+ smpl_doc = ptext SLIT("main expression")
+\end{code}
+
+tcRnType just finds the kind of a type
+
+\begin{code}
+tcRnType :: HscEnv
+ -> InteractiveContext
+ -> LHsType RdrName
+ -> IO (Maybe Kind)
+tcRnType hsc_env ictxt rdr_type
+ = initTcPrintErrors hsc_env iNTERACTIVE $
+ setInteractiveContext hsc_env ictxt $ do {
+
+ rn_type <- rnLHsType doc rdr_type ;
+ failIfErrsM ;
+
+ -- Now kind-check the type
+ (ty', kind) <- kcHsType rn_type ;
+ return kind
+ }
+ where
+ doc = ptext SLIT("In GHCi input")
+
+#endif /* GHCi */
+\end{code}
+
+
+%************************************************************************
+%* *
+ More GHCi stuff, to do with browsing and getting info
+%* *
+%************************************************************************
+
+\begin{code}
+#ifdef GHCI
+mkExportEnv :: HscEnv -> [Module] -- Expose these modules' exports only
+ -> IO GlobalRdrEnv
+mkExportEnv hsc_env exports
+ = do { mb_envs <- initTcPrintErrors hsc_env iNTERACTIVE $
mappM getModuleExports exports
; case mb_envs of
Just envs -> return (foldr plusGlobalRdrEnv emptyGlobalRdrEnv envs)
-- Some error; initTc will have printed it
}
-getModuleExports :: ModuleName -> TcM GlobalRdrEnv
+getModuleExports :: Module -> TcM GlobalRdrEnv
getModuleExports mod
= do { iface <- load_iface mod
; loadOrphanModules (dep_orphs (mi_deps iface))
-- Load any orphan-module interfaces,
-- so their instances are visible
- ; avails <- exportsToAvails (mi_exports iface)
+ ; names <- exportsToAvails (mi_exports iface)
; let { gres = [ GRE { gre_name = name, gre_prov = vanillaProv mod }
- | avail <- avails, name <- availNames avail ] }
+ | name <- nameSetToList names ] }
; returnM (mkGlobalRdrEnv gres) }
-vanillaProv :: ModuleName -> Provenance
+vanillaProv :: Module -> Provenance
-- We're building a GlobalRdrEnv as if the user imported
-- all the specified modules into the global interactive module
vanillaProv mod = Imported [ImportSpec mod mod False
\begin{code}
getModuleContents
:: HscEnv
- -> InteractiveContext
- -> ModuleName -- Module to inspect
+ -> Module -- Module to inspect
-> Bool -- Grab just the exports, or the whole toplev
-> IO (Maybe [IfaceDecl])
-getModuleContents hsc_env ictxt mod exports_only
+getModuleContents hsc_env mod exports_only
= initTcPrintErrors hsc_env iNTERACTIVE (get_mod_contents exports_only)
where
get_mod_contents exports_only
- | not exports_only -- We want the whole top-level type env
+ | not exports_only -- We want the whole top-level type env
-- so it had better be a home module
= do { hpt <- getHpt
- ; case lookupModuleEnvByName hpt mod of
- Just mod_info -> return (map (toIfaceDecl ictxt) $
+ ; case lookupModuleEnv hpt mod of
+ Just mod_info -> return (map (toIfaceDecl ext_nm) $
filter wantToSee $
typeEnvElts $
md_types (hm_details mod_info))
| otherwise -- Want the exports only
= do { iface <- load_iface mod
- ; avails <- exportsToAvails (mi_exports iface)
- ; mappM get_decl avails
+ ; mappM get_decl [ (mod,avail) | (mod, avails) <- mi_exports iface
+ , avail <- avails ]
}
- get_decl avail
- = do { thing <- tcLookupGlobal (availName avail)
- ; return (filter_decl (availOccs avail) (toIfaceDecl ictxt thing)) }
+ get_decl (mod, avail)
+ = do { main_name <- lookupOrig mod (availName avail)
+ ; thing <- tcLookupGlobal main_name
+ ; return (filter_decl (availNames avail) (toIfaceDecl ext_nm thing)) }
+
+ ext_nm = interactiveExtNameFun (icPrintUnqual (hsc_IC hsc_env))
---------------------
filter_decl occs decl@(IfaceClass {ifSigs = sigs})
= decl { ifSigs = filter (keep_sig occs) sigs }
-filter_decl occs decl@(IfaceData {ifCons = IfDataTyCon cons})
- = decl { ifCons = IfDataTyCon (filter (keep_con occs) cons) }
+filter_decl occs decl@(IfaceData {ifCons = IfDataTyCon th cons})
+ = decl { ifCons = IfDataTyCon th (filter (keep_con occs) cons) }
filter_decl occs decl@(IfaceData {ifCons = IfNewTyCon con})
| keep_con occs con = decl
| otherwise = decl {ifCons = IfAbstractTyCon} -- Hmm?
filter_decl occs decl
= decl
-keep_sig occs (IfaceClassOp occ _ _) = occ `elem` occs
-keep_con occs (IfaceConDecl occ _ _ _ _ _ _) = occ `elem` occs
-
-availOccs avail = map nameOccName (availNames avail)
+keep_sig occs (IfaceClassOp occ _ _) = occ `elem` occs
+keep_con occs con = ifConOcc con `elem` occs
wantToSee (AnId id) = not (isImplicitId id)
wantToSee (ADataCon _) = False -- They'll come via their TyCon
---------------------
noRdrEnvErr mod = ptext SLIT("No top-level environment available for module")
<+> quotes (ppr mod)
-#endif
\end{code}
-%************************************************************************
-%* *
- Checking for 'main'
-%* *
-%************************************************************************
-
\begin{code}
-checkMain
- = do { ghci_mode <- getGhciMode ;
- tcg_env <- getGblEnv ;
+type GetInfoResult = (String, IfaceDecl, Fixity, SrcLoc,
+ [(IfaceType,SrcLoc)] -- Instances
+ )
- mb_main_mod <- readMutVar v_MainModIs ;
- mb_main_fn <- readMutVar v_MainFunIs ;
- let { main_mod = case mb_main_mod of {
- Just mod -> mkModuleName mod ;
- Nothing -> mAIN_Name } ;
- main_fn = case mb_main_fn of {
- Just fn -> mkRdrUnqual (mkVarOcc (mkFastString fn)) ;
- Nothing -> main_RDR_Unqual } } ;
-
- check_main ghci_mode tcg_env main_mod main_fn
- }
+tcRnGetInfo :: HscEnv
+ -> InteractiveContext
+ -> RdrName
+ -> IO (Maybe [GetInfoResult])
+-- Used to implemnent :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,
+-- 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
+tcRnGetInfo hsc_env ictxt rdr_name
+ = initTcPrintErrors hsc_env iNTERACTIVE $
+ setInteractiveContext hsc_env ictxt $ do {
-check_main ghci_mode tcg_env main_mod main_fn
- -- If we are in module Main, check that 'main' is defined.
- -- It may be imported from another module!
- --
- -- ToDo: We have to return the main_name separately, because it's a
- -- bona fide 'use', and should be recorded as such, but the others
- -- aren't
- --
- -- Blimey: a whole page of code to do this...
- | mod_name /= main_mod
- = return tcg_env
+ -- If the identifier is a constructor (begins with an
+ -- upper-case letter), then we need to consider both
+ -- constructor and type class identifiers.
+ let { rdr_names = dataTcOccs rdr_name } ;
- | otherwise
- = addErrCtxt mainCtxt $
- do { mb_main <- lookupSrcOcc_maybe main_fn
- -- Check that 'main' is in scope
- -- It might be imported from another module!
- ; case mb_main of {
- Nothing -> do { complain_no_main
- ; return tcg_env } ;
- Just main_name -> do
- { let { rhs = nlHsApp (nlHsVar runIOName) (nlHsVar main_name) }
- -- :Main.main :: IO () = runIO main
+ -- results :: [(Messages, Maybe Name)]
+ results <- mapM (tryTc . lookupOccRn) rdr_names ;
- ; (main_expr, ty) <- addSrcSpan (srcLocSpan (getSrcLoc main_name)) $
- tcInferRho rhs
+ traceRn (text "xx" <+> vcat [ppr rdr_names, ppr (map snd results)]);
+ -- The successful lookups will be (Just name)
+ let { (warns_s, good_names) = unzip [ (msgs, name)
+ | (msgs, Just name) <- results] ;
+ errs_s = [msgs | (msgs, Nothing) <- results] } ;
- ; let { root_main_id = mkExportedLocalId rootMainName ty ;
- main_bind = noLoc (VarBind root_main_id main_expr) }
+ -- Fail if nothing good happened, else add warnings
+ 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 ;
+
+ -- And lookup up the entities, avoiding duplicates, which arise
+ -- because constructors and record selectors are represented by
+ -- their parent declaration
+ let { do_one name = do { thing <- tcLookupGlobal name
+ ; fixity <- lookupFixityRn name
+ ; dfuns <- lookupInsts ext_nm thing
+ ; return (str, toIfaceDecl ext_nm thing, fixity,
+ getSrcLoc thing,
+ [(toIfaceType ext_nm (idType dfun), getSrcLoc dfun) | dfun <- dfuns]
+ ) }
+ where
+ -- str is the the naked occurrence name
+ -- after stripping off qualification and parens (+)
+ str = occNameUserString (nameOccName name)
+ } ;
- ; return (tcg_env { tcg_binds = tcg_binds tcg_env
- `snocBag` main_bind,
- tcg_dus = tcg_dus tcg_env
- `plusDU` usesOnly (unitFV main_name)
- })
- }}}
+ -- For the SrcLoc, the 'thing' has better info than
+ -- the 'name' because getting the former forced the
+ -- declaration to be loaded into the cache
+
+ results <- mapM do_one good_names ;
+ return (fst (removeDups cmp results))
+ }
where
- mod_name = moduleName (tcg_mod tcg_env)
-
- complain_no_main | ghci_mode == Interactive = return ()
- | otherwise = failWithTc noMainMsg
- -- In interactive mode, don't worry about the absence of 'main'
- -- In other modes, fail altogether, so that we don't go on
- -- and complain a second time when processing the export list.
+ cmp (_,d1,_,_,_) (_,d2,_,_,_) = ifName d1 `compare` ifName d2
+ ext_nm = interactiveExtNameFun (icPrintUnqual ictxt)
+
+
+lookupInsts :: (Name -> IfaceExtName) -> TyThing -> TcM [DFunId]
+-- Filter the instances by the ones whose tycons (or clases resp)
+-- are in scope unqualified. Otherwise we list a whole lot too many!
+lookupInsts ext_nm (AClass cls)
+ = do { loadImportedInsts cls [] -- [] means load all instances for cls
+ ; inst_envs <- tcGetInstEnvs
+ ; return [ dfun
+ | (_,_,dfun) <- classInstances inst_envs cls
+ , let (_, tycons) = ifaceInstGates (ifInstHead (dfunToIfaceInst ext_nm dfun))
+ -- Rather an indirect/inefficient test, but there we go
+ , all print_tycon_unqual tycons ] }
+ where
+ print_tycon_unqual (IfaceTc nm) = isLocalIfaceExtName nm
+ print_tycon_unqual other = True -- Int etc
+
- mainCtxt = ptext SLIT("When checking the type of the main function") <+> quotes (ppr main_fn)
- noMainMsg = ptext SLIT("The main function") <+> quotes (ppr main_fn)
- <+> ptext SLIT("is not defined in module") <+> quotes (ppr main_mod)
-\end{code}
+lookupInsts ext_nm (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)
+ ; mapM_ (\c -> loadImportedInsts c [])
+ (typeEnvClasses (eps_PTE eps))
+ ; (pkg_ie, home_ie) <- tcGetInstEnvs -- Search all
+ ; return [ dfun
+ | (_, _, dfun) <- instEnvElts home_ie ++ instEnvElts pkg_ie
+ , relevant dfun
+ , let (cls, _) = ifaceInstGates (ifInstHead (dfunToIfaceInst ext_nm dfun))
+ , isLocalIfaceExtName cls ] }
+ where
+ relevant df = tc_name `elemNameSet` tyClsNamesOfDFunHead (idType df)
+ tc_name = tyConName tc
+lookupInsts ext_nm other = return []
+
+
+toIfaceDecl :: (Name -> IfaceExtName) -> TyThing -> IfaceDecl
+toIfaceDecl ext_nm thing
+ = tyThingToIfaceDecl True -- Discard IdInfo
+ emptyNameSet -- Show data cons
+ ext_nm (munge thing)
+ where
+ -- munge transforms a thing to its "parent" thing
+ munge (ADataCon dc) = ATyCon (dataConTyCon dc)
+ munge (AnId id) = case globalIdDetails id of
+ RecordSelId tc lbl -> ATyCon tc
+ ClassOpId cls -> AClass cls
+ other -> AnId id
+ munge other_thing = other_thing
+#endif /* GHCI */
+\end{code}
%************************************************************************
%* *
ppr_sigs :: [Var] -> SDoc
ppr_sigs ids
-- Print type signatures; sort by OccName
- = vcat (map ppr_sig (sortLt lt_sig ids))
+ = vcat (map ppr_sig (sortLe le_sig ids))
where
- lt_sig id1 id2 = getOccName id1 < getOccName id2
+ le_sig id1 id2 = getOccName id1 <= getOccName id2
ppr_sig id = ppr id <+> dcolon <+> ppr (tidyTopType (idType id))
ppr_rules :: [IdCoreRule] -> SDoc