X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Ftypecheck%2FTcRnDriver.lhs;h=ee2cb50c4c735cb5b3ff681b5d04ae89820e734d;hb=d551dbfef0b710f5ede21ee0c54ee7e80dd53b64;hp=26432274ffff972ea51cf9b2aab915d8e98212d1;hpb=e802f7a7f88d9cc71472f8296f9e2d72e4f82b13;p=ghc-hetmet.git diff --git a/ghc/compiler/typecheck/TcRnDriver.lhs b/ghc/compiler/typecheck/TcRnDriver.lhs index 2643227..ee2cb50 100644 --- a/ghc/compiler/typecheck/TcRnDriver.lhs +++ b/ghc/compiler/typecheck/TcRnDriver.lhs @@ -6,7 +6,9 @@ \begin{code} module TcRnDriver ( #ifdef GHCI - mkExportEnv, getModuleContents, tcRnStmt, tcRnThing, tcRnExpr, + mkExportEnv, getModuleContents, tcRnStmt, + tcRnGetInfo, GetInfoResult, + tcRnExpr, tcRnType, #endif tcRnModule, tcTopSrcDecls, @@ -15,102 +17,124 @@ module TcRnDriver ( #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 HsSyn +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 ) +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, tcLookupGlobal ) +import TcEnv ( tcExtendGlobalValEnv ) import TcRules ( tcRules ) import TcForeign ( tcForeignImports, tcForeignExports ) import TcInstDcls ( tcInstDecls1, tcInstDecls2 ) 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 ErrUtils ( mkDumpDoc, showPass ) +import DataCon ( dataConWrapId ) +import ErrUtils ( Messages, mkDumpDoc, showPass ) import Id ( mkExportedLocalId, isLocalId, idName, idType ) import Var ( Var ) -import Module ( mkHomeModule, mkModuleName, moduleName, moduleEnvElts ) +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(..), noDependencies, +import DriverPhases ( HscSource(..), isHsBoot ) +import HscTypes ( ModGuts(..), HscEnv(..), ExternalPackageState(..), + IsBootInterface, noDependencies, Deprecs( NoDeprecs ), plusDeprecs, - GenAvailInfo(Avail), availsToNameSet, availName, - ForeignStubs(NoStubs), TypeEnv, typeEnvTyCons, - extendTypeEnvWithIds, typeEnvIds, typeEnvTyCons, + ForeignStubs(NoStubs), TyThing(..), + TypeEnv, lookupTypeEnv, hptInstances, lookupType, + extendTypeEnvWithIds, typeEnvIds, typeEnvTyCons, emptyFixityEnv ) +import Outputable + #ifdef GHCI -import HsSyn ( HsStmtContext(..), - Stmt(..), - collectStmtsBinders, mkSimpleMatch, placeHolderType ) +import HsSyn ( HsStmtContext(..), Stmt(..), HsExpr(..), HsBindGroup(..), + LStmt, LHsExpr, LHsType, mkMatchGroup, + collectStmtsBinders, mkSimpleMatch, + mkExprStmt, mkBindStmt, nlVarPat ) import RdrName ( GlobalRdrEnv, mkGlobalRdrEnv, GlobalRdrElt(..), Provenance(..), ImportSpec(..), lookupLocalRdrEnv, extendLocalRdrEnv ) import RnSource ( addTcgDUs ) 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 TcEnv ( tcLookupTyCon, tcLookupId ) -import TyCon ( DataConDetails(..) ) -import Inst ( tcStdSyntaxName ) +import TcType ( Type, mkForAllTys, mkFunTys, mkTyConApp, tyVarsOfType, + isUnLiftedType, tyClsNamesOfDFunHead ) +import TcEnv ( tcLookupTyCon, tcLookupId, tcLookupGlobal ) +import RnTypes ( rnLHsType ) +import Inst ( tcGetInstEnvs ) +import InstEnv ( DFunId, classInstances, instEnvElts ) import RnExpr ( rnStmts, rnLExpr ) import RnNames ( exportsToAvails ) -import LoadIface ( loadSrcInterface ) -import IfaceSyn ( IfaceDecl(..), IfaceClassOp(..), IfaceConDecl(..), IfaceExtName(..), - tyThingToIfaceDecl ) +import LoadIface ( loadSrcInterface, ifaceInstGates ) +import IfaceSyn ( IfaceDecl(..), IfaceClassOp(..), IfaceConDecl(..), + 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(..), 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 ) @@ -127,26 +151,48 @@ import Maybe ( isJust ) \begin{code} tcRnModule :: HscEnv + -> HscSource -> Located (HsModule RdrName) - -> IO (Maybe TcGblEnv) + -> 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 @@ -159,7 +205,10 @@ tcRnModule hsc_env (L loc (HsModule maybe_mod exports 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") ; @@ -172,322 +221,46 @@ tcRnModule hsc_env (L loc (HsModule maybe_mod exports reportDeprecations tcg_env ; -- Process the export list - export_avails <- exportsFromAvail (isJust maybe_mod) exports ; - - -- 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 let { mod_deprecs = checkModDeprec mod_deprec } ; -- Add exports and deprecations to envt - let { export_fvs = availsToNameSet export_avails ; - final_env = tcg_env { tcg_exports = export_avails, - tcg_dus = tcg_dus tcg_env `plusDU` usesOnly export_fvs, + let { final_env = tcg_env { tcg_exports = exports, + tcg_dus = tcg_dus tcg_env `plusDU` usesOnly exports, tcg_deprecs = tcg_deprecs tcg_env `plusDeprecs` mod_deprecs } -- A module deprecation over-rides the earlier ones } ; -- Report unused names - reportUnusedNames final_env ; + reportUnusedNames export_ies final_env ; -- Dump output and return tcDump final_env ; return final_env }}}} -\end{code} - - -%************************************************************************ -%* * - The interactive interface -%* * -%************************************************************************ - -\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 (). - -tcRnStmt hsc_env ictxt rdr_stmt - = initTc hsc_env iNTERACTIVE $ - setInteractiveContext 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 { -- 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 ; - - 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) - } -\end{code} - - -Here is the grand plan, implemented in tcUserStmt - - What you type The IO [HValue] that hscStmt returns - ------------- ------------------------------------ - let pat = expr ==> let pat = expr in return [coerce HVal x, coerce HVal y, ...] - bindings: [x,y,...] - - pat <- expr ==> expr >>= \ pat -> return [coerce HVal x, coerce HVal y, ...] - bindings: [x,y,...] - - expr (of IO type) ==> expr >>= \ v -> return [coerce HVal v] - [NB: result not printed] bindings: [it] - - expr (of non-IO type, ==> let v = expr in print v >> return [coerce HVal v] - 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 - [ 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] }) - -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 = check_rhs, - sc_body = check_body, - sc_ty = ret_ty } ; - - check_rhs rhs rhs_ty = tcCheckRho rhs (mkTyConApp ioTyCon [rhs_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 ; - - return (zonked_ids, zonked_expr) - } - where - combine stmt (ids, stmts) = (ids, stmt:stmts) -\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 - = initTc 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} - - -\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 - = initTc 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 ; - - -- 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] } ; - - -- 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 -} ext_nm thing - where - unqual = icPrintUnqual ictxt - ext_nm n | unqual n = LocalTop (nameOccName n) -- What a hack - | otherwise = ExtPkg (nameModuleName n) (nameOccName n) +-- 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} -\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) -#endif /* GHCI */ -\end{code} - %************************************************************************ %* * Type-checking external-core modules @@ -497,14 +270,14 @@ setInteractiveContext icxt thing_inside \begin{code} tcRnExtCore :: HscEnv -> HsExtCore RdrName - -> IO (Maybe ModGuts) + -> 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 { + initTc hsc_env ExtCoreFile this_mod $ do { let { ldecls = map noLoc decls } ; @@ -524,23 +297,24 @@ tcRnExtCore hsc_env (HsExtCore this_mod decls src_binds) -- Typecheck them all together so that -- any mutually recursive types are done right - tcg_env <- checkNoErrs (tcTyAndClassDecls rn_decls) ; + 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 this_mod src_binds) ; + core_binds <- initIfaceExtCore (tcExtCoreBindings src_binds) ; -- Wrap up let { bndrs = bindersOfBinds core_binds ; - my_exports = map (Avail . idName) bndrs ; + my_exports = mkNameSet (map idName bndrs) ; -- ToDo: export the data types also? final_type_env = extendTypeEnvWithIds (tcg_type_env tcg_env) bndrs ; mod_guts = ModGuts { mg_module = this_mod, + mg_boot = False, mg_usages = [], -- ToDo: compute usage mg_dir_imps = [], -- ?? mg_deps = noDependencies, -- ?? @@ -581,8 +355,14 @@ 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) ; + = 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 ; + + -- Do all the declarations + (tc_envs, lie) <- getLIE (tc_rn_src_decls boot_names decls) ; -- tcSimplifyTop deals with constant or ambiguous InstIds. -- How could there be ambiguous ones? They can only arise if a @@ -608,6 +388,9 @@ tcRnSrcDecls decls let { final_type_env = extendTypeEnvWithIds type_env bind_ids } ; + -- Compre the hi-boot iface (if any) with the real thing + checkHiBootIface final_type_env boot_names ; + -- Make the new type env available to stuff slurped from interface files writeMutVar (tcg_type_env_var tcg_env) final_type_env ; @@ -615,15 +398,15 @@ tcRnSrcDecls decls tcg_binds = binds', tcg_rules = rules', tcg_fords = fords' }) } -tc_rn_src_decls :: [LHsDecl RdrName] -> TcM (TcGblEnv, TcLclEnv) +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 ds +tc_rn_src_decls boot_names 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 ; + 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 @@ -654,43 +437,161 @@ tc_rn_src_decls ds -- 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) + tc_rn_src_decls boot_names (spliced_decls ++ rest_ds) #endif /* GHCI */ }}} \end{code} - %************************************************************************ %* * - Type-checking the top level of a module + Compiling hs-boot source files, and + comparing the hi-boot interface with the real thing %* * %************************************************************************ -tcRnGroup takes a bunch of top-level source-code declarations, and - * renames them - * gets supporting declarations from interface files - * typechecks them - * zonks them - * and augments the TcGblEnv with the results +\begin{code} +tcRnHsBootDecls :: [LHsDecl RdrName] -> TcM TcGblEnv +tcRnHsBootDecls decls + = do { let { (first_group, group_tail) = findSplice decls } -In Template Haskell it may be called repeatedly for each group of -declarations. It expects there to be an incoming TcGblEnv in the -monad; it augments it and returns the new TcGblEnv. + ; case group_tail of + Just stuff -> spliceInHsBootErr stuff + Nothing -> return () -\begin{code} -tcRnGroup :: HsGroup RdrName -> TcM (TcGblEnv, TcLclEnv) - -- Returns the variables free in the decls, for unused-binding reporting -tcRnGroup decls - = do { -- Rename the declarations - (tcg_env, rn_decls) <- rnTopSrcDecls decls ; - setGblEnv tcg_env $ do { + -- Rename the declarations + ; (tcg_env, rn_group) <- rnTopSrcDecls first_group + ; setGblEnv tcg_env $ do { - -- Typecheck the declarations - tcTopSrcDecls rn_decls - }} + -- Todo: check no foreign decls, no rules, no default decls ------------------------------------------------- -rnTopSrcDecls :: HsGroup RdrName -> TcM (TcGblEnv, HsGroup Name) + -- 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 { + + -- Typecheck instance decls + ; traceTc (text "Tc3") + ; (tcg_env, inst_infos, _binds) <- tcInstDecls1 tycl_decls (hs_instds rn_group) + ; setGblEnv tcg_env $ do { + + -- Typecheck value declarations + ; traceTc (text "Tc5") + ; new_ids <- tcHsBootSigs (hs_valds rn_group) + + -- 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 }) + }}}} + +spliceInHsBootErr (SpliceDecl (L loc _), _) + = addErrAt loc (ptext SLIT("Splices are not allowed in hs-boot files")) +\end{code} + +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} +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 + +check_thing (AnId boot_id) (AnId real_id) + | idType boot_id `tcEqType` idType real_id + = return () + +check_thing (ADataCon dc1) (ADataCon dc2) + | idType (dataConWrapId dc1) `tcEqType` idType (dataConWrapId dc2) + = return () + + -- Can't declare a class in a hi-boot file + +check_thing boot_thing real_thing -- Default case; failure + = addErrAt (srcLocSpan (getSrcLoc real_thing)) + (bootMisMatch real_thing) + +---------------- +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} + + +%************************************************************************ +%* * + Type-checking the top level of a module +%* * +%************************************************************************ + +tcRnGroup takes a bunch of top-level source-code declarations, and + * renames them + * gets supporting declarations from interface files + * typechecks them + * zonks them + * and augments the TcGblEnv with the results + +In Template Haskell it may be called repeatedly for each group of +declarations. It expects there to be an incoming TcGblEnv in the +monad; it augments it and returns the new TcGblEnv. + +\begin{code} +tcRnGroup :: [Name] -> HsGroup RdrName -> TcM (TcGblEnv, TcLclEnv) + -- Returns the variables free in the decls, for unused-binding reporting +tcRnGroup boot_names decls + = do { -- Rename the declarations + (tcg_env, rn_decls) <- rnTopSrcDecls decls ; + setGblEnv tcg_env $ do { + + -- Typecheck the declarations + tcTopSrcDecls boot_names rn_decls + }} + +------------------------------------------------ +rnTopSrcDecls :: HsGroup RdrName -> TcM (TcGblEnv, HsGroup Name) rnTopSrcDecls group = do { -- Bring top level binders into scope (rdr_env, imports) <- importsFromLocalDecls group ; @@ -712,8 +613,8 @@ rnTopSrcDecls group }} ------------------------------------------------ -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, @@ -724,7 +625,7 @@ tcTopSrcDecls -- 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 @@ -787,22 +688,369 @@ tcTopSrcDecls \end{code} +%************************************************************************ +%* * + Checking for 'main' +%* * +%************************************************************************ + +\begin{code} +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 + } + + +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} + + %********************************************************* %* * - mkGlobalContext: make up an interactive context - - Used for initialising the lexical environment - of the interactive read-eval-print loop + GHCi stuff %* * %********************************************************* \begin{code} #ifdef GHCI -mkExportEnv :: HscEnv -> [ModuleName] -- Expose these modules' exports only - -> IO GlobalRdrEnv +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 loc (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 (map (L loc) [ + LetStmt [HsBindGroup (unitBag the_bind) [] NonRecursive], + mkExprStmt (nlHsApp (nlHsVar printName) (nlHsVar fresh_it)) + ]) }) + (do { -- Try this first + traceTc (text "tcs 1a") ; + tc_stmts [L loc (mkBindStmt (nlVarPat fresh_it) expr)] }) + +tcUserStmt stmt = tc_stmts [stmt] + +--------------------------- +tc_stmts :: [Stmt RdrName] -> +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_bind = infer_rhs, + sc_expr = infer_rhs, + sc_body = check_body, + sc_ty = ret_ty } ; + + infer_rhs _bind_op rhs + = do { (rhs', rhs_ty) <- tcInferRho rhs + ; [pat_ty] <- unifyTyConApp ioTyCon rhs_ty + ; return (noSyntaxExpr, 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 { + (tc_stmts, ids) <- 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, noLoc (HsDo DoExpr tc_stmts (mk_return ret_id 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 <- initTc hsc_env iNTERACTIVE $ + = do { mb_envs <- initTcPrintErrors hsc_env iNTERACTIVE $ mappM getModuleExports exports ; case mb_envs of Just envs -> return (foldr plusGlobalRdrEnv emptyGlobalRdrEnv envs) @@ -810,15 +1058,18 @@ mkExportEnv hsc_env exports -- Some error; initTc will have printed it } -getModuleExports :: ModuleName -> TcM GlobalRdrEnv +getModuleExports :: Module -> TcM GlobalRdrEnv getModuleExports mod = do { iface <- load_iface mod - ; avails <- exportsToAvails (mi_exports iface) + ; loadOrphanModules (dep_orphs (mi_deps iface)) + -- Load any orphan-module interfaces, + -- so their instances are visible + ; 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 @@ -828,20 +1079,19 @@ 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 - = initTc hsc_env iNTERACTIVE (get_mod_contents 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)) @@ -851,26 +1101,30 @@ getModuleContents hsc_env ictxt mod exports_only | 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 = DataCons cons}) - = decl { ifCons = DataCons (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 @@ -884,83 +1138,132 @@ load_iface mod = loadSrcInterface doc mod False {- Not boot iface -} --------------------- 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 + + +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 [] - 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} +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} %************************************************************************ %* * @@ -986,7 +1289,7 @@ tcDump env } where short_dump = pprTcGblEnv env - full_dump = ppr (tcg_binds env) + full_dump = pprLHsBinds (tcg_binds env) -- NB: foreign x-d's have undefined's in their types; -- hence can't show the tc_fords @@ -1041,9 +1344,9 @@ ppr_insts dfun_ids = text "INSTANCES" $$ nest 4 (ppr_sigs dfun_ids) 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