{-# LANGUAGE CPP #-} {-# LANGUAGE BangPatterns #-} {-# LANGUAGE RecordWildCards #-} {-# OPTIONS_GHC -Wno-incomplete-uni-patterns #-} -- ----------------------------------------------------------------------------- -- -- (c) The University of Glasgow, 2005-2007 -- -- Running statements interactively -- -- ----------------------------------------------------------------------------- module GHC.Runtime.Eval ( Resume(..), History(..), execStmt, execStmt', ExecOptions(..), execOptions, ExecResult(..), resumeExec, runDecls, runDeclsWithLocation, runParsedDecls, parseImportDecl, SingleStep(..), abandon, abandonAll, getResumeContext, getHistorySpan, getModBreaks, getHistoryModule, setupBreakpoint, back, forward, setContext, getContext, getNamesInScope, getRdrNamesInScope, moduleIsInterpreted, getInfo, exprType, typeKind, parseName, parseInstanceHead, getInstancesForType, getDocs, GetDocsFailure(..), showModule, moduleIsBootOrNotObjectLinkable, parseExpr, compileParsedExpr, compileExpr, dynCompileExpr, compileExprRemote, compileParsedExprRemote, Term(..), obtainTermFromId, obtainTermFromVal, reconstructType ) where import GHC.Prelude import GHC.Driver.Monad import GHC.Driver.Main import GHC.Driver.Errors.Types ( hoistTcRnMessage ) import GHC.Driver.Env import GHC.Driver.Session import GHC.Driver.Ppr import GHC.Driver.Config import GHC.Runtime.Eval.Types import GHC.Runtime.Interpreter as GHCi import GHC.Runtime.Heap.Inspect import GHC.Runtime.Context import GHCi.Message import GHCi.RemoteTypes import GHC.ByteCode.Types import GHC.Linker.Loader as Loader import GHC.Hs import GHC.Core.Class (classTyCon) import GHC.Core.FamInstEnv ( FamInst, orphNamesOfFamInst ) import GHC.Core.InstEnv import GHC.Core.Predicate import GHC.Core.TyCo.Ppr import GHC.Core.TyCon import GHC.Core.Type hiding( typeKind ) import qualified GHC.Core.Type as Type import GHC.Iface.Env ( newInteractiveBinder ) import GHC.Tc.Utils.TcType import GHC.Tc.Types.Constraint import GHC.Tc.Types.Origin import GHC.Builtin.Names ( toDynName, pretendNameIsInScope ) import GHC.Data.Maybe import GHC.Data.FastString import GHC.Data.Bag import GHC.Utils.Error import GHC.Utils.Exception import GHC.Utils.Logger import GHC.Utils.Misc import GHC.Utils.Monad import GHC.Utils.Outputable import GHC.Utils.Panic import GHC.Types.RepType import GHC.Types.Fixity.Env import GHC.Types.Var import GHC.Types.Id as Id import GHC.Types.Name hiding ( varName ) import GHC.Types.Name.Set import GHC.Types.Name.Reader import GHC.Types.Var.Env import GHC.Types.SrcLoc import GHC.Types.Unique import GHC.Types.Unique.Supply import GHC.Types.Unique.DSet import GHC.Types.TyThing import GHC.Types.BreakInfo import GHC.Types.Unique.Map import GHC.Unit import GHC.Unit.Module.Graph import GHC.Unit.Module.ModIface import GHC.Unit.Module.ModSummary import GHC.Unit.Home.ModInfo import GHC.Tc.Module ( runTcInteractive, tcRnType, loadUnqualIfaces ) import GHC.Tc.Utils.Zonk ( ZonkFlexi (SkolemiseFlexi) ) import GHC.Tc.Utils.Env (tcGetInstEnvs, lookupGlobal) import GHC.Tc.Utils.Instantiate (instDFunType) import GHC.Tc.Solver (simplifyWantedsTcM) import GHC.Tc.Utils.Monad import GHC.Unit.Env import GHC.IfaceToCore import Control.Monad import Control.Monad.Catch as MC import Data.Array import Data.Dynamic import Data.Either import Data.IntMap (IntMap) import qualified Data.IntMap as IntMap import Data.List (find,intercalate) import Data.List.NonEmpty (NonEmpty) import System.Directory import Unsafe.Coerce ( unsafeCoerce ) -- ----------------------------------------------------------------------------- -- running a statement interactively getResumeContext :: GhcMonad m => m [Resume] getResumeContext = withSession (return . ic_resume . hsc_IC) mkHistory :: HscEnv -> ForeignHValue -> BreakInfo -> History mkHistory hsc_env hval bi = History hval bi (findEnclosingDecls hsc_env bi) getHistoryModule :: History -> Module getHistoryModule = breakInfo_module . historyBreakInfo getHistorySpan :: HscEnv -> History -> SrcSpan getHistorySpan hsc_env History{..} = let BreakInfo{..} = historyBreakInfo in case lookupHugByModule breakInfo_module (hsc_HUG hsc_env) of Just hmi -> modBreaks_locs (getModBreaks hmi) ! breakInfo_number _ -> panic "getHistorySpan" {- | Finds the enclosing top level function name -} -- ToDo: a better way to do this would be to keep hold of the decl_path computed -- by the coverage pass, which gives the list of lexically-enclosing bindings -- for each tick. findEnclosingDecls :: HscEnv -> BreakInfo -> [String] findEnclosingDecls hsc_env (BreakInfo modl ix) = let hmi = expectJust "findEnclosingDecls" $ lookupHugByModule modl (hsc_HUG hsc_env) mb = getModBreaks hmi in modBreaks_decls mb ! ix -- | Update fixity environment in the current interactive context. updateFixityEnv :: GhcMonad m => FixityEnv -> m () updateFixityEnv fix_env = do hsc_env <- getSession let ic = hsc_IC hsc_env setSession $ hsc_env { hsc_IC = ic { ic_fix_env = fix_env } } -- ----------------------------------------------------------------------------- -- execStmt -- | default ExecOptions execOptions :: ExecOptions execOptions = ExecOptions { execSingleStep = RunToCompletion , execSourceFile = "" , execLineNumber = 1 , execWrap = EvalThis -- just run the statement, don't wrap it in anything } -- | Run a statement in the current interactive context. execStmt :: GhcMonad m => String -- ^ a statement (bind or expression) -> ExecOptions -> m ExecResult execStmt input exec_opts@ExecOptions{..} = do hsc_env <- getSession mb_stmt <- liftIO $ runInteractiveHsc hsc_env $ hscParseStmtWithLocation execSourceFile execLineNumber input case mb_stmt of -- empty statement / comment Nothing -> return (ExecComplete (Right []) 0) Just stmt -> execStmt' stmt input exec_opts -- | Like `execStmt`, but takes a parsed statement as argument. Useful when -- doing preprocessing on the AST before execution, e.g. in GHCi (see -- GHCi.UI.runStmt). execStmt' :: GhcMonad m => GhciLStmt GhcPs -> String -> ExecOptions -> m ExecResult execStmt' stmt stmt_text ExecOptions{..} = do hsc_env <- getSession let interp = hscInterp hsc_env -- Turn off -fwarn-unused-local-binds when running a statement, to hide -- warnings about the implicit bindings we introduce. let ic = hsc_IC hsc_env -- use the interactive dflags idflags' = ic_dflags ic `wopt_unset` Opt_WarnUnusedLocalBinds hsc_env' = mkInteractiveHscEnv (hsc_env{ hsc_IC = ic{ ic_dflags = idflags' }}) r <- liftIO $ hscParsedStmt hsc_env' stmt case r of Nothing -> -- empty statement / comment return (ExecComplete (Right []) 0) Just (ids, hval, fix_env) -> do updateFixityEnv fix_env status <- withVirtualCWD $ liftIO $ do let eval_opts = initEvalOpts idflags' (isStep execSingleStep) evalStmt interp eval_opts (execWrap hval) let ic = hsc_IC hsc_env bindings = (ic_tythings ic, ic_gre_cache ic) size = ghciHistSize idflags' handleRunStatus execSingleStep stmt_text bindings ids status (emptyHistory size) runDecls :: GhcMonad m => String -> m [Name] runDecls = runDeclsWithLocation "" 1 -- | Run some declarations and return any user-visible names that were brought -- into scope. runDeclsWithLocation :: GhcMonad m => String -> Int -> String -> m [Name] runDeclsWithLocation source line_num input = do hsc_env <- getSession decls <- liftIO (hscParseDeclsWithLocation hsc_env source line_num input) runParsedDecls decls -- | Like `runDeclsWithLocation`, but takes parsed declarations as argument. -- Useful when doing preprocessing on the AST before execution, e.g. in GHCi -- (see GHCi.UI.runStmt). runParsedDecls :: GhcMonad m => [LHsDecl GhcPs] -> m [Name] runParsedDecls decls = do hsc_env <- getSession (tyThings, ic) <- liftIO (hscParsedDecls hsc_env decls) setSession $ hsc_env { hsc_IC = ic } hsc_env <- getSession hsc_env' <- liftIO $ rttiEnvironment hsc_env setSession hsc_env' return $ filter (not . isDerivedOccName . nameOccName) -- For this filter, see Note [What to show to users] $ map getName tyThings {- Note [What to show to users] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We don't want to display internally-generated bindings to users. Things like the coercion axiom for newtypes. These bindings all get OccNames that users can't write, to avoid the possibility of name clashes (in linker symbols). That gives a convenient way to suppress them. The relevant predicate is OccName.isDerivedOccName. See #11051 for more background and examples. -} withVirtualCWD :: GhcMonad m => m a -> m a withVirtualCWD m = do hsc_env <- getSession -- a virtual CWD is only necessary when we're running interpreted code in -- the same process as the compiler. case interpInstance <$> hsc_interp hsc_env of Just (ExternalInterp {}) -> m _ -> do let ic = hsc_IC hsc_env let set_cwd = do dir <- liftIO $ getCurrentDirectory case ic_cwd ic of Just dir -> liftIO $ setCurrentDirectory dir Nothing -> return () return dir reset_cwd orig_dir = do virt_dir <- liftIO $ getCurrentDirectory hsc_env <- getSession let old_IC = hsc_IC hsc_env setSession hsc_env{ hsc_IC = old_IC{ ic_cwd = Just virt_dir } } liftIO $ setCurrentDirectory orig_dir MC.bracket set_cwd reset_cwd $ \_ -> m parseImportDecl :: GhcMonad m => String -> m (ImportDecl GhcPs) parseImportDecl expr = withSession $ \hsc_env -> liftIO $ hscImport hsc_env expr emptyHistory :: Int -> BoundedList History emptyHistory size = nilBL size handleRunStatus :: GhcMonad m => SingleStep -> String -> ResumeBindings -> [Id] -> EvalStatus_ [ForeignHValue] [HValueRef] -> BoundedList History -> m ExecResult handleRunStatus step expr bindings final_ids status history | RunAndLogSteps <- step = tracing | otherwise = not_tracing where tracing | EvalBreak is_exception apStack_ref ix mod_uniq resume_ctxt _ccs <- status , not is_exception = do hsc_env <- getSession let interp = hscInterp hsc_env let dflags = hsc_dflags hsc_env let hmi = expectJust "handleRunStatus" $ lookupHptDirectly (hsc_HPT hsc_env) (mkUniqueGrimily mod_uniq) modl = mi_module (hm_iface hmi) breaks = getModBreaks hmi b <- liftIO $ breakpointStatus interp (modBreaks_flags breaks) ix if b then not_tracing -- This breakpoint is explicitly enabled; we want to stop -- instead of just logging it. else do apStack_fhv <- liftIO $ mkFinalizedHValue interp apStack_ref let bi = BreakInfo modl ix !history' = mkHistory hsc_env apStack_fhv bi `consBL` history -- history is strict, otherwise our BoundedList is pointless. fhv <- liftIO $ mkFinalizedHValue interp resume_ctxt let eval_opts = initEvalOpts dflags True status <- liftIO $ GHCi.resumeStmt interp eval_opts fhv handleRunStatus RunAndLogSteps expr bindings final_ids status history' | otherwise = not_tracing not_tracing -- Hit a breakpoint | EvalBreak is_exception apStack_ref ix mod_uniq resume_ctxt ccs <- status = do hsc_env <- getSession let interp = hscInterp hsc_env resume_ctxt_fhv <- liftIO $ mkFinalizedHValue interp resume_ctxt apStack_fhv <- liftIO $ mkFinalizedHValue interp apStack_ref let hmi = expectJust "handleRunStatus" $ lookupHptDirectly (hsc_HPT hsc_env) (mkUniqueGrimily mod_uniq) modl = mi_module (hm_iface hmi) bp | is_exception = Nothing | otherwise = Just (BreakInfo modl ix) (hsc_env1, names, span, decl) <- liftIO $ bindLocalsAtBreakpoint hsc_env apStack_fhv bp let resume = Resume { resumeStmt = expr, resumeContext = resume_ctxt_fhv , resumeBindings = bindings, resumeFinalIds = final_ids , resumeApStack = apStack_fhv , resumeBreakInfo = bp , resumeSpan = span, resumeHistory = toListBL history , resumeDecl = decl , resumeCCS = ccs , resumeHistoryIx = 0 } hsc_env2 = pushResume hsc_env1 resume setSession hsc_env2 return (ExecBreak names bp) -- Completed successfully | EvalComplete allocs (EvalSuccess hvals) <- status = do hsc_env <- getSession let final_ic = extendInteractiveContextWithIds (hsc_IC hsc_env) final_ids final_names = map getName final_ids interp = hscInterp hsc_env liftIO $ Loader.extendLoadedEnv interp (zip final_names hvals) hsc_env' <- liftIO $ rttiEnvironment hsc_env{hsc_IC=final_ic} setSession hsc_env' return (ExecComplete (Right final_names) allocs) -- Completed with an exception | EvalComplete alloc (EvalException e) <- status = return (ExecComplete (Left (fromSerializableException e)) alloc) #if __GLASGOW_HASKELL__ <= 810 | otherwise = panic "not_tracing" -- actually exhaustive, but GHC can't tell #endif resumeExec :: GhcMonad m => (SrcSpan->Bool) -> SingleStep -> Maybe Int -> m ExecResult resumeExec canLogSpan step mbCnt = do hsc_env <- getSession let ic = hsc_IC hsc_env resume = ic_resume ic case resume of [] -> liftIO $ throwGhcExceptionIO (ProgramError "not stopped at a breakpoint") (r:rs) -> do -- unbind the temporary locals by restoring the TypeEnv from -- before the breakpoint, and drop this Resume from the -- InteractiveContext. let (resume_tmp_te,resume_gre_cache) = resumeBindings r ic' = ic { ic_tythings = resume_tmp_te, ic_gre_cache = resume_gre_cache, ic_resume = rs } setSession hsc_env{ hsc_IC = ic' } -- remove any bindings created since the breakpoint from the -- linker's environment let old_names = map getName resume_tmp_te new_names = [ n | thing <- ic_tythings ic , let n = getName thing , not (n `elem` old_names) ] interp = hscInterp hsc_env dflags = hsc_dflags hsc_env liftIO $ Loader.deleteFromLoadedEnv interp new_names case r of Resume { resumeStmt = expr, resumeContext = fhv , resumeBindings = bindings, resumeFinalIds = final_ids , resumeApStack = apStack, resumeBreakInfo = mb_brkpt , resumeSpan = span , resumeHistory = hist } -> withVirtualCWD $ do when (isJust mb_brkpt && isJust mbCnt) $ do setupBreakpoint hsc_env (fromJust mb_brkpt) (fromJust mbCnt) -- When the user specified a break ignore count, set it -- in the interpreter let eval_opts = initEvalOpts dflags (isStep step) status <- liftIO $ GHCi.resumeStmt interp eval_opts fhv let prevHistoryLst = fromListBL 50 hist hist' = case mb_brkpt of Nothing -> prevHistoryLst Just bi | not $ canLogSpan span -> prevHistoryLst | otherwise -> mkHistory hsc_env apStack bi `consBL` fromListBL 50 hist handleRunStatus step expr bindings final_ids status hist' setupBreakpoint :: GhcMonad m => HscEnv -> BreakInfo -> Int -> m () -- #19157 setupBreakpoint hsc_env brkInfo cnt = do let modl :: Module = breakInfo_module brkInfo breaks hsc_env modl = getModBreaks $ expectJust "setupBreakpoint" $ lookupHpt (hsc_HPT hsc_env) (moduleName modl) ix = breakInfo_number brkInfo modBreaks = breaks hsc_env modl breakarray = modBreaks_flags modBreaks interp = hscInterp hsc_env _ <- liftIO $ GHCi.storeBreakpoint interp breakarray ix cnt pure () back :: GhcMonad m => Int -> m ([Name], Int, SrcSpan, String) back n = moveHist (+n) forward :: GhcMonad m => Int -> m ([Name], Int, SrcSpan, String) forward n = moveHist (subtract n) moveHist :: GhcMonad m => (Int -> Int) -> m ([Name], Int, SrcSpan, String) moveHist fn = do hsc_env <- getSession case ic_resume (hsc_IC hsc_env) of [] -> liftIO $ throwGhcExceptionIO (ProgramError "not stopped at a breakpoint") (r:rs) -> do let ix = resumeHistoryIx r history = resumeHistory r new_ix = fn ix -- when (history `lengthLessThan` new_ix) $ liftIO $ throwGhcExceptionIO (ProgramError "no more logged breakpoints") when (new_ix < 0) $ liftIO $ throwGhcExceptionIO (ProgramError "already at the beginning of the history") let update_ic apStack mb_info = do (hsc_env1, names, span, decl) <- liftIO $ bindLocalsAtBreakpoint hsc_env apStack mb_info let ic = hsc_IC hsc_env1 r' = r { resumeHistoryIx = new_ix } ic' = ic { ic_resume = r':rs } setSession hsc_env1{ hsc_IC = ic' } return (names, new_ix, span, decl) -- careful: we want apStack to be the AP_STACK itself, not a thunk -- around it, hence the cases are carefully constructed below to -- make this the case. ToDo: this is v. fragile, do something better. if new_ix == 0 then case r of Resume { resumeApStack = apStack, resumeBreakInfo = mb_brkpt } -> update_ic apStack mb_brkpt else case history !! (new_ix - 1) of History{..} -> update_ic historyApStack (Just historyBreakInfo) -- ----------------------------------------------------------------------------- -- After stopping at a breakpoint, add free variables to the environment result_fs :: FastString result_fs = fsLit "_result" bindLocalsAtBreakpoint :: HscEnv -> ForeignHValue -> Maybe BreakInfo -> IO (HscEnv, [Name], SrcSpan, String) -- Nothing case: we stopped when an exception was raised, not at a -- breakpoint. We have no location information or local variables to -- bind, all we can do is bind a local variable to the exception -- value. bindLocalsAtBreakpoint hsc_env apStack Nothing = do let exn_occ = mkVarOccFS (fsLit "_exception") span = mkGeneralSrcSpan (fsLit "") exn_name <- newInteractiveBinder hsc_env exn_occ span let e_fs = fsLit "e" e_name = mkInternalName (getUnique e_fs) (mkTyVarOccFS e_fs) span e_tyvar = mkRuntimeUnkTyVar e_name liftedTypeKind exn_id = Id.mkVanillaGlobal exn_name (mkTyVarTy e_tyvar) ictxt0 = hsc_IC hsc_env ictxt1 = extendInteractiveContextWithIds ictxt0 [exn_id] interp = hscInterp hsc_env -- Loader.extendLoadedEnv interp [(exn_name, apStack)] return (hsc_env{ hsc_IC = ictxt1 }, [exn_name], span, "") -- Just case: we stopped at a breakpoint, we have information about the location -- of the breakpoint and the free variables of the expression. bindLocalsAtBreakpoint hsc_env apStack_fhv (Just BreakInfo{..}) = do let hmi = expectJust "bindLocalsAtBreakpoint" $ lookupHpt (hsc_HPT hsc_env) (moduleName breakInfo_module) interp = hscInterp hsc_env breaks = getModBreaks hmi info = expectJust "bindLocalsAtBreakpoint2" $ IntMap.lookup breakInfo_number (modBreaks_breakInfo breaks) occs = modBreaks_vars breaks ! breakInfo_number span = modBreaks_locs breaks ! breakInfo_number decl = intercalate "." $ modBreaks_decls breaks ! breakInfo_number -- Rehydrate to understand the breakpoint info relative to the current environment. -- This design is critical to preventing leaks (#22530) (mbVars, result_ty) <- initIfaceLoad hsc_env $ initIfaceLcl breakInfo_module (text "debugger") NotBoot $ hydrateCgBreakInfo info let -- Filter out any unboxed ids by changing them to Nothings; -- we can't bind these at the prompt mbPointers = nullUnboxed <$> mbVars (ids, offsets, occs') = syncOccs mbPointers occs free_tvs = tyCoVarsOfTypesWellScoped (result_ty:map idType ids) -- It might be that getIdValFromApStack fails, because the AP_STACK -- has been accidentally evaluated, or something else has gone wrong. -- So that we don't fall over in a heap when this happens, just don't -- bind any free variables instead, and we emit a warning. mb_hValues <- mapM (getBreakpointVar interp apStack_fhv . fromIntegral) offsets when (any isNothing mb_hValues) $ debugTraceMsg (hsc_logger hsc_env) 1 $ text "Warning: _result has been evaluated, some bindings have been lost" us <- mkSplitUniqSupply 'I' -- Dodgy; will give the same uniques every time let tv_subst = newTyVars us free_tvs (filtered_ids, occs'') = unzip -- again, sync the occ-names [ (id, occ) | (id, Just _hv, occ) <- zip3 ids mb_hValues occs' ] (_,tidy_tys) = tidyOpenTypes emptyTidyEnv $ map (substTy tv_subst . idType) filtered_ids new_ids <- zipWith3M mkNewId occs'' tidy_tys filtered_ids result_name <- newInteractiveBinder hsc_env (mkVarOccFS result_fs) span let result_id = Id.mkVanillaGlobal result_name (substTy tv_subst result_ty) result_ok = isPointer result_id final_ids | result_ok = result_id : new_ids | otherwise = new_ids ictxt0 = hsc_IC hsc_env ictxt1 = extendInteractiveContextWithIds ictxt0 final_ids names = map idName new_ids let fhvs = catMaybes mb_hValues Loader.extendLoadedEnv interp (zip names fhvs) when result_ok $ Loader.extendLoadedEnv interp [(result_name, apStack_fhv)] hsc_env1 <- rttiEnvironment hsc_env{ hsc_IC = ictxt1 } return (hsc_env1, if result_ok then result_name:names else names, span, decl) where -- We need a fresh Unique for each Id we bind, because the linker -- state is single-threaded and otherwise we'd spam old bindings -- whenever we stop at a breakpoint. The InteractveContext is properly -- saved/restored, but not the linker state. See #1743, test break026. mkNewId :: OccName -> Type -> Id -> IO Id mkNewId occ ty old_id = do { name <- newInteractiveBinder hsc_env occ (getSrcSpan old_id) ; return (Id.mkVanillaGlobalWithInfo name ty (idInfo old_id)) } newTyVars :: UniqSupply -> [TcTyVar] -> Subst -- Similarly, clone the type variables mentioned in the types -- we have here, *and* make them all RuntimeUnk tyvars newTyVars us tvs = foldl' new_tv emptySubst (tvs `zip` uniqsFromSupply us) new_tv subst (tv,uniq) = extendTCvSubstWithClone subst tv new_tv where new_tv = mkRuntimeUnkTyVar (setNameUnique (tyVarName tv) uniq) (substTy subst (tyVarKind tv)) isPointer id | [rep] <- typePrimRep (idType id) , isGcPtrRep rep = True | otherwise = False -- Convert unboxed Id's to Nothings nullUnboxed (Just (fv@(id, _))) | isPointer id = Just fv | otherwise = Nothing nullUnboxed Nothing = Nothing -- See Note [Syncing breakpoint info] syncOccs :: [Maybe (a,b)] -> [c] -> ([a], [b], [c]) syncOccs mbVs ocs = unzip3 $ catMaybes $ joinOccs mbVs ocs where joinOccs :: [Maybe (a,b)] -> [c] -> [Maybe (a,b,c)] joinOccs = zipWithEqual "bindLocalsAtBreakpoint" joinOcc joinOcc mbV oc = (\(a,b) c -> (a,b,c)) <$> mbV <*> pure oc rttiEnvironment :: HscEnv -> IO HscEnv rttiEnvironment hsc_env@HscEnv{hsc_IC=ic} = do let tmp_ids = [id | AnId id <- ic_tythings ic] incompletelyTypedIds = [id | id <- tmp_ids , not $ noSkolems id , (occNameFS.nameOccName.idName) id /= result_fs] foldM improveTypes hsc_env (map idName incompletelyTypedIds) where noSkolems = noFreeVarsOfType . idType improveTypes hsc_env@HscEnv{hsc_IC=ic} name = do let tmp_ids = [id | AnId id <- ic_tythings ic] Just id = find (\i -> idName i == name) tmp_ids if noSkolems id then return hsc_env else do mb_new_ty <- reconstructType hsc_env 10 id let old_ty = idType id case mb_new_ty of Nothing -> return hsc_env Just new_ty -> do case improveRTTIType hsc_env old_ty new_ty of Nothing -> warnPprTrace True (":print failed to calculate the " ++ "improvement for a type") (vcat [ text "id" <+> ppr id , text "old_ty" <+> debugPprType old_ty , text "new_ty" <+> debugPprType new_ty ]) $ return hsc_env Just subst -> do let logger = hsc_logger hsc_env putDumpFileMaybe logger Opt_D_dump_rtti "RTTI" FormatText (fsep [text "RTTI Improvement for", ppr id, equals, ppr subst]) let ic' = substInteractiveContext ic subst return hsc_env{hsc_IC=ic'} pushResume :: HscEnv -> Resume -> HscEnv pushResume hsc_env resume = hsc_env { hsc_IC = ictxt1 } where ictxt0 = hsc_IC hsc_env ictxt1 = ictxt0 { ic_resume = resume : ic_resume ictxt0 } {- Note [Syncing breakpoint info] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ To display the values of the free variables for a single breakpoint, the function `GHC.Runtime.Eval.bindLocalsAtBreakpoint` pulls out the information from the fields `modBreaks_breakInfo` and `modBreaks_vars` of the `ModBreaks` data structure. For a specific breakpoint this gives 2 lists of type `Id` (or `Var`) and `OccName`. They are used to create the Id's for the free variables and must be kept in sync! There are 3 situations where items are removed from the Id list (or replaced with `Nothing`): 1.) If function `GHC.StgToByteCode.schemeER_wrk` (which creates the Id list) doesn't find an Id in the ByteCode environment. 2.) If function `GHC.Runtime.Eval.bindLocalsAtBreakpoint` filters out unboxed elements from the Id list, because GHCi cannot yet handle them. 3.) If the GHCi interpreter doesn't find the reference to a free variable of our breakpoint. This also happens in the function bindLocalsAtBreakpoint. If an element is removed from the Id list, then the corresponding element must also be removed from the Occ list. Otherwise GHCi will confuse variable names as in #8487. -} -- ----------------------------------------------------------------------------- -- Abandoning a resume context abandon :: GhcMonad m => m Bool abandon = do hsc_env <- getSession let ic = hsc_IC hsc_env resume = ic_resume ic interp = hscInterp hsc_env case resume of [] -> return False r:rs -> do setSession hsc_env{ hsc_IC = ic { ic_resume = rs } } liftIO $ abandonStmt interp (resumeContext r) return True abandonAll :: GhcMonad m => m Bool abandonAll = do hsc_env <- getSession let ic = hsc_IC hsc_env resume = ic_resume ic interp = hscInterp hsc_env case resume of [] -> return False rs -> do setSession hsc_env{ hsc_IC = ic { ic_resume = [] } } liftIO $ mapM_ (abandonStmt interp. resumeContext) rs return True -- ----------------------------------------------------------------------------- -- Bounded list, optimised for repeated cons data BoundedList a = BL {-# UNPACK #-} !Int -- length {-# UNPACK #-} !Int -- bound [a] -- left [a] -- right, list is (left ++ reverse right) nilBL :: Int -> BoundedList a nilBL bound = BL 0 bound [] [] consBL :: a -> BoundedList a -> BoundedList a consBL a (BL len bound left right) | len < bound = BL (len+1) bound (a:left) right | null right = BL len bound [a] $! tail (reverse left) | otherwise = BL len bound (a:left) $! tail right toListBL :: BoundedList a -> [a] toListBL (BL _ _ left right) = left ++ reverse right fromListBL :: Int -> [a] -> BoundedList a fromListBL bound l = BL (length l) bound l [] -- lenBL (BL len _ _ _) = len -- ----------------------------------------------------------------------------- -- | Set the interactive evaluation context. -- -- (setContext imports) sets the ic_imports field (which in turn -- determines what is in scope at the prompt) to 'imports', and -- updates the icReaderEnv environment to reflect it. -- -- We retain in scope all the things defined at the prompt, and kept -- in ic_tythings. (Indeed, they shadow stuff from ic_imports.) setContext :: GhcMonad m => [InteractiveImport] -> m () setContext imports = do { hsc_env <- getSession ; let dflags = hsc_dflags hsc_env ; all_env_err <- liftIO $ findGlobalRdrEnv hsc_env imports ; case all_env_err of Left (mod, err) -> liftIO $ throwGhcExceptionIO (formatError dflags mod err) Right all_env -> do { ; let old_ic = hsc_IC hsc_env !final_gre_cache = ic_gre_cache old_ic `replaceImportEnv` all_env ; setSession hsc_env{ hsc_IC = old_ic { ic_imports = imports , ic_gre_cache = final_gre_cache }}}} where formatError dflags mod err = ProgramError . showSDoc dflags $ text "Cannot add module" <+> ppr mod <+> text "to context:" <+> text err findGlobalRdrEnv :: HscEnv -> [InteractiveImport] -> IO (Either (ModuleName, String) GlobalRdrEnv) -- Compute the GlobalRdrEnv for the interactive context findGlobalRdrEnv hsc_env imports = do { idecls_env <- hscRnImportDecls hsc_env idecls -- This call also loads any orphan modules ; return $ case partitionEithers (map mkEnv imods) of (err : _, _) -> Left err ([], imods_env0) -> -- Need to rehydrate the 'GlobalRdrEnv' to recover the 'GREInfo's. -- This is done in order to avoid space leaks. -- See Note [Forcing GREInfo] in GHC.Types.GREInfo. let imods_env = map (hydrateGlobalRdrEnv get_GRE_info) imods_env0 in Right (foldr plusGlobalRdrEnv idecls_env imods_env) } where idecls :: [LImportDecl GhcPs] idecls = [noLocA d | IIDecl d <- imports] imods :: [ModuleName] imods = [m | IIModule m <- imports] mkEnv mod = case mkTopLevEnv (hsc_HPT hsc_env) mod of Left err -> Left (mod, err) Right env -> Right env get_GRE_info nm = tyThingGREInfo <$> lookupGlobal hsc_env nm mkTopLevEnv :: HomePackageTable -> ModuleName -> Either String IfGlobalRdrEnv mkTopLevEnv hpt modl = case lookupHpt hpt modl of Nothing -> Left "not a home module" Just details -> case mi_globals (hm_iface details) of Nothing -> Left "not interpreted" Just env -> Right env -- It's OK to be lazy here; we force the GlobalRdrEnv before storing it -- in ModInfo; see GHCi.UI.Info. -- See Note [Forcing GREInfo] in GHC.Types.GREInfo. -- | Get the interactive evaluation context, consisting of a pair of the -- set of modules from which we take the full top-level scope, and the set -- of modules from which we take just the exports respectively. getContext :: GhcMonad m => m [InteractiveImport] getContext = withSession $ \HscEnv{ hsc_IC=ic } -> return (ic_imports ic) -- | Returns @True@ if the specified module is interpreted, and hence has -- its full top-level scope available. moduleIsInterpreted :: GhcMonad m => Module -> m Bool moduleIsInterpreted modl = withSession $ \h -> if notHomeModule (hsc_home_unit h) modl then return False else case lookupHpt (hsc_HPT h) (moduleName modl) of Just details -> return (isJust (mi_globals (hm_iface details))) _not_a_home_module -> return False -- | Looks up an identifier in the current interactive context (for :info) -- Filter the instances by the ones whose tycons (or classes resp) -- are in scope (qualified or otherwise). Otherwise we list a whole lot too many! -- The exact choice of which ones to show, and which to hide, is a judgement call. -- (see #1581) getInfo :: GhcMonad m => Bool -> Name -> m (Maybe (TyThing,Fixity,[ClsInst],[FamInst], SDoc)) getInfo allInfo name = withSession $ \hsc_env -> do mb_stuff <- liftIO $ hscTcRnGetInfo hsc_env name case mb_stuff of Nothing -> return Nothing Just (thing, fixity, cls_insts, fam_insts, docs) -> do let rdr_env = icReaderEnv (hsc_IC hsc_env) -- Filter the instances based on whether the constituent names of their -- instance heads are all in scope. let cls_insts' = filter (plausible rdr_env . orphNamesOfClsInst) cls_insts fam_insts' = filter (plausible rdr_env . orphNamesOfFamInst) fam_insts return (Just (thing, fixity, cls_insts', fam_insts', docs)) where plausible rdr_env names -- Dfun involving only names that are in icReaderEnv = allInfo || nameSetAll ok names where -- A name is ok if it's in the rdr_env, -- whether qualified or not ok n | n == name = True -- The one we looked for in the first place! | pretendNameIsInScope n = True -- See Note [pretendNameIsInScope] in GHC.Builtin.Names | isExternalName n = isJust (lookupGRE_Name rdr_env n) | otherwise = True -- | Returns all names in scope in the current interactive context getNamesInScope :: GhcMonad m => m [Name] getNamesInScope = withSession $ \hsc_env -> return $ map greName $ globalRdrEnvElts (icReaderEnv (hsc_IC hsc_env)) -- | Returns all 'RdrName's in scope in the current interactive -- context, excluding any that are internally-generated. getRdrNamesInScope :: GhcMonad m => m [RdrName] getRdrNamesInScope = withSession $ \hsc_env -> do let ic = hsc_IC hsc_env gbl_rdrenv = icReaderEnv ic gbl_names = concatMap greRdrNames $ globalRdrEnvElts gbl_rdrenv -- Exclude internally generated names; see e.g. #11328 return (filter (not . isDerivedOccName . rdrNameOcc) gbl_names) -- | Parses a string as an identifier, and returns the list of 'Name's that -- the identifier can refer to in the current interactive context. parseName :: GhcMonad m => String -> m (NonEmpty Name) parseName str = withSession $ \hsc_env -> liftIO $ do { lrdr_name <- hscParseIdentifier hsc_env str ; hscTcRnLookupRdrName hsc_env lrdr_name } getDocs :: GhcMonad m => Name -> m (Either GetDocsFailure (Maybe [HsDoc GhcRn], IntMap (HsDoc GhcRn))) -- TODO: What about docs for constructors etc.? getDocs name = withSession $ \hsc_env -> do case nameModule_maybe name of Nothing -> pure (Left (NameHasNoModule name)) Just mod -> do if isInteractiveModule mod then pure (Left InteractiveName) else do iface <- liftIO $ hscGetModuleInterface hsc_env mod case mi_docs iface of Nothing -> pure (Left (NoDocsInIface mod compiled)) Just Docs { docs_decls = decls , docs_args = args } -> pure (Right ( lookupUniqMap decls name , fromMaybe mempty $ lookupUniqMap args name)) where compiled = -- TODO: Find a more direct indicator. case nameSrcLoc name of RealSrcLoc {} -> False UnhelpfulLoc {} -> True -- | Failure modes for 'getDocs'. data GetDocsFailure -- | 'nameModule_maybe' returned 'Nothing'. = NameHasNoModule Name -- | The module was loaded without @-haddock@, | NoDocsInIface Module Bool -- ^ 'True': The module was compiled. -- 'False': The module was :loaded. -- | The 'Name' was defined interactively. | InteractiveName instance Outputable GetDocsFailure where ppr (NameHasNoModule name) = quotes (ppr name) <+> text "has no module where we could look for docs." ppr (NoDocsInIface mod compiled) = vcat [ text "Can't find any documentation for" <+> ppr mod <> char '.' , if compiled then text "Try re-compiling with '-haddock'." else text "Try running ':set -haddock' and :load the file again." -- TODO: Figure out why :reload doesn't load the docs and maybe fix it. ] ppr InteractiveName = text "Docs are unavailable for interactive declarations." -- ----------------------------------------------------------------------------- -- Getting the type of an expression -- | Get the type of an expression -- Returns the type as described by 'TcRnExprMode' exprType :: GhcMonad m => TcRnExprMode -> String -> m Type exprType mode expr = withSession $ \hsc_env -> do ty <- liftIO $ hscTcExpr hsc_env mode expr return $ tidyType emptyTidyEnv ty -- ----------------------------------------------------------------------------- -- Getting the kind of a type -- | Get the kind of a type typeKind :: GhcMonad m => Bool -> String -> m (Type, Kind) typeKind normalise str = withSession $ \hsc_env -> liftIO $ hscKcType hsc_env normalise str -- ---------------------------------------------------------------------------- -- Getting the class instances for a type {- Note [Querying instances for a type] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Here is the implementation of GHC proposal 41. (https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0041-ghci-instances.rst) The objective is to take a query string representing a (partial) type, and report all the class single-parameter class instances available to that type. Extending this feature to multi-parameter typeclasses is left as future work. The general outline of how we solve this is: 1. Parse the type, leaving skolems in the place of type-holes. 2. For every class, get a list of all instances that match with the query type. 3. For every matching instance, ask GHC for the context the instance dictionary needs. 4. Format and present the results, substituting our query into the instance and simplifying the context. For example, given the query "Maybe Int", we want to return: instance Show (Maybe Int) instance Read (Maybe Int) instance Eq (Maybe Int) .... [Holes in queries] Often times we want to know what instances are available for a polymorphic type, like `Maybe a`, and we'd like to return instances such as: instance Show a => Show (Maybe a) .... These queries are expressed using type holes, so instead of `Maybe a` the user writes `Maybe _`, we parse the type and during zonking, we skolemise it, replacing the holes with (un-named) type variables. When zonking the type holes we have two real choices: replace them with Any or replace them with skolem typevars. Using skolem type variables ensures that the output is more intuitive to end users, and there is no difference in the results between Any and skolems. -} -- Find all instances that match a provided type getInstancesForType :: GhcMonad m => Type -> m [ClsInst] getInstancesForType ty = withSession $ \hsc_env -> liftIO $ runInteractiveHsc hsc_env $ ioMsgMaybe $ hoistTcRnMessage $ runTcInteractive hsc_env $ do -- Bring class and instances from unqualified modules into scope, this fixes #16793. loadUnqualIfaces hsc_env (hsc_IC hsc_env) matches <- findMatchingInstances ty fmap catMaybes . forM matches $ uncurry checkForExistence -- Parse a type string and turn any holes into skolems parseInstanceHead :: GhcMonad m => String -> m Type parseInstanceHead str = withSession $ \hsc_env0 -> do (ty, _) <- liftIO $ runInteractiveHsc hsc_env0 $ do hsc_env <- getHscEnv ty <- hscParseType str ioMsgMaybe $ hoistTcRnMessage $ tcRnType hsc_env SkolemiseFlexi True ty return ty -- Get all the constraints required of a dictionary binding getDictionaryBindings :: PredType -> TcM CtEvidence getDictionaryBindings theta = do dictName <- newName (mkDictOcc (mkVarOccFS (fsLit "magic"))) let dict_var = mkVanillaGlobal dictName theta loc <- getCtLocM (GivenOrigin (getSkolemInfo unkSkol)) Nothing return CtWanted { ctev_pred = varType dict_var, ctev_dest = EvVarDest dict_var, ctev_loc = loc, ctev_rewriters = emptyRewriterSet } -- Find instances where the head unifies with the provided type findMatchingInstances :: Type -> TcM [(ClsInst, [DFunInstType])] findMatchingInstances ty = do ies@(InstEnvs {ie_global = ie_global, ie_local = ie_local}) <- tcGetInstEnvs let allClasses = uniqDSetToList $ instEnvClasses ie_global `unionUniqDSets` instEnvClasses ie_local return $ concatMap (try_cls ies) allClasses where {- Check that a class instance is well-kinded. Since `:instances` only works for unary classes, we're looking for instances of kind k -> Constraint where k is the type of the queried type. -} try_cls ies cls | Just (_, _, arg_kind, res_kind) <- splitFunTy_maybe (tyConKind $ classTyCon cls) , isConstraintKind res_kind , Type.typeKind ty `eqType` arg_kind , (matches, _, _) <- lookupInstEnv True ies cls [ty] = matches | otherwise = [] {- When we've found an instance that a query matches against, we still need to check that all the instance's constraints are satisfiable. checkForExistence creates an instance dictionary and verifies that any unsolved constraints mention a type-hole, meaning it is blocked on an unknown. If the instance satisfies this condition, then we return it with the query substituted into the instance and all constraints simplified, for example given: instance D a => C (MyType a b) where and the query `MyType _ String` the unsolved constraints will be [D _] so we apply the substitution: { a -> _; b -> String} and return the instance: instance D _ => C (MyType _ String) -} checkForExistence :: ClsInst -> [DFunInstType] -> TcM (Maybe ClsInst) checkForExistence clsInst mb_inst_tys = do -- We want to force the solver to attempt to solve the constraints for clsInst. -- Usually, this isn't a problem since there should only be a single instance -- for a type. However, when we have overlapping instances, the solver will give up -- since it can't decide which instance to use. To get around this restriction, instead -- of asking the solver to solve a constraint for clsInst, we ask it to solve the -- thetas of clsInst. (tys, thetas) <- instDFunType (is_dfun clsInst) mb_inst_tys wanteds <- mapM getDictionaryBindings thetas -- It's important to zonk constraints after solving in order to expose things like TypeErrors -- which otherwise appear as opaque type variables. (See #18262). WC { wc_simple = simples, wc_impl = impls } <- simplifyWantedsTcM wanteds -- The simples might contain superclasses. This clutters up the output -- (we want e.g. instance Ord a => Ord (Maybe a), not -- instance (Ord a, Eq a) => Ord (Maybe a)). So we use mkMinimalBySCs let simple_preds = map ctPred (bagToList simples) let minimal_simples = mkMinimalBySCs id simple_preds if all allowedSimple minimal_simples && solvedImplics impls then return . Just $ substInstArgs tys minimal_simples clsInst else return Nothing where allowedSimple :: PredType -> Bool allowedSimple pred = isSatisfiablePred pred solvedImplics :: Bag Implication -> Bool solvedImplics impls = allBag (isSolvedStatus . ic_status) impls -- Stricter version of isTyVarClassPred that requires all TyConApps to have at least -- one argument or for the head to be a TyVar. The reason is that we want to ensure -- that all residual constraints mention a type-hole somewhere in the constraint, -- meaning that with the correct choice of a concrete type it could be possible for -- the constraint to be discharged. isSatisfiablePred :: PredType -> Bool isSatisfiablePred ty = case getClassPredTys_maybe ty of Just (_, tys@(_:_)) -> all isTyVarTy tys _ -> isTyVarTy ty empty_subst = mkEmptySubst (mkInScopeSet (tyCoVarsOfType (idType $ is_dfun clsInst))) {- Create a ClsInst with instantiated arguments and constraints. The thetas are the list of constraints that couldn't be solved because they mention a type-hole. -} substInstArgs :: [Type] -> [PredType] -> ClsInst -> ClsInst substInstArgs tys thetas inst = let subst = foldl' (\a b -> uncurry (extendTvSubstAndInScope a) b) empty_subst (zip dfun_tvs tys) -- Build instance head with arguments substituted in tau = mkClassPred cls (substTheta subst args) -- Constrain the instance with any residual constraints phi = mkPhiTy thetas tau sigma = mkForAllTys (map (\v -> Bndr v Inferred) dfun_tvs) phi in inst { is_dfun = (is_dfun inst) { varType = sigma }} where (dfun_tvs, _, cls, args) = instanceSig inst ----------------------------------------------------------------------------- -- Compile an expression, run it, and deliver the result -- | Parse an expression, the parsed expression can be further processed and -- passed to compileParsedExpr. parseExpr :: GhcMonad m => String -> m (LHsExpr GhcPs) parseExpr expr = withSession $ \hsc_env -> liftIO $ runInteractiveHsc hsc_env $ hscParseExpr expr -- | Compile an expression, run it, and deliver the resulting HValue. compileExpr :: GhcMonad m => String -> m HValue compileExpr expr = do parsed_expr <- parseExpr expr compileParsedExpr parsed_expr -- | Compile an expression, run it, and deliver the resulting HValue. compileExprRemote :: GhcMonad m => String -> m ForeignHValue compileExprRemote expr = do parsed_expr <- parseExpr expr compileParsedExprRemote parsed_expr -- | Compile a parsed expression (before renaming), run it, and deliver -- the resulting HValue. compileParsedExprRemote :: GhcMonad m => LHsExpr GhcPs -> m ForeignHValue compileParsedExprRemote expr@(L loc _) = withSession $ \hsc_env -> do let dflags = hsc_dflags hsc_env let interp = hscInterp hsc_env -- > let _compileParsedExpr = expr -- Create let stmt from expr to make hscParsedStmt happy. -- We will ignore the returned [Id], namely [expr_id], and not really -- create a new binding. let expr_fs = fsLit "_compileParsedExpr" loc' = locA loc expr_name = mkInternalName (getUnique expr_fs) (mkTyVarOccFS expr_fs) loc' let_stmt = L loc . LetStmt noAnn . (HsValBinds noAnn) $ ValBinds NoAnnSortKey (unitBag $ mkHsVarBind loc' (getRdrName expr_name) expr) [] pstmt <- liftIO $ hscParsedStmt hsc_env let_stmt let (hvals_io, fix_env) = case pstmt of Just ([_id], hvals_io', fix_env') -> (hvals_io', fix_env') _ -> panic "compileParsedExprRemote" updateFixityEnv fix_env let eval_opts = initEvalOpts dflags False status <- liftIO $ evalStmt interp eval_opts (EvalThis hvals_io) case status of EvalComplete _ (EvalSuccess [hval]) -> return hval EvalComplete _ (EvalException e) -> liftIO $ throwIO (fromSerializableException e) _ -> panic "compileParsedExpr" compileParsedExpr :: GhcMonad m => LHsExpr GhcPs -> m HValue compileParsedExpr expr = do fhv <- compileParsedExprRemote expr interp <- hscInterp <$> getSession liftIO $ wormhole interp fhv -- | Compile an expression, run it and return the result as a Dynamic. dynCompileExpr :: GhcMonad m => String -> m Dynamic dynCompileExpr expr = do parsed_expr <- parseExpr expr -- > Data.Dynamic.toDyn expr let loc = getLoc parsed_expr to_dyn_expr = mkHsApp (L loc . HsVar noExtField . L (la2na loc) $ getRdrName toDynName) parsed_expr hval <- compileParsedExpr to_dyn_expr return (unsafeCoerce hval :: Dynamic) ----------------------------------------------------------------------------- -- show a module and it's source/object filenames showModule :: GhcMonad m => ModSummary -> m String showModule mod_summary = withSession $ \hsc_env -> do let dflags = hsc_dflags hsc_env let interpreted = case lookupHug (hsc_HUG hsc_env) (ms_unitid mod_summary) (ms_mod_name mod_summary) of Nothing -> panic "missing linkable" Just mod_info -> isJust (homeModInfoByteCode mod_info) && isNothing (homeModInfoObject mod_info) return (showSDoc dflags $ showModMsg dflags interpreted (ModuleNode [] mod_summary)) moduleIsBootOrNotObjectLinkable :: GhcMonad m => ModSummary -> m Bool moduleIsBootOrNotObjectLinkable mod_summary = withSession $ \hsc_env -> case lookupHug (hsc_HUG hsc_env) (ms_unitid mod_summary) (ms_mod_name mod_summary) of Nothing -> panic "missing linkable" Just mod_info -> return . isNothing $ homeModInfoByteCode mod_info ---------------------------------------------------------------------------- -- RTTI primitives obtainTermFromVal :: HscEnv -> Int -> Bool -> Type -> a -> IO Term #if defined(HAVE_INTERNAL_INTERPRETER) obtainTermFromVal hsc_env bound force ty x = case interpInstance interp of InternalInterp -> cvObtainTerm hsc_env bound force ty (unsafeCoerce x) #else obtainTermFromVal hsc_env _bound _force _ty _x = case interpInstance interp of #endif ExternalInterp {} -> throwIO (InstallationError "this operation requires -fno-external-interpreter") where interp = hscInterp hsc_env obtainTermFromId :: HscEnv -> Int -> Bool -> Id -> IO Term obtainTermFromId hsc_env bound force id = do (hv, _, _) <- Loader.loadName (hscInterp hsc_env) hsc_env (varName id) cvObtainTerm hsc_env bound force (idType id) hv -- Uses RTTI to reconstruct the type of an Id, making it less polymorphic reconstructType :: HscEnv -> Int -> Id -> IO (Maybe Type) reconstructType hsc_env bound id = do (hv, _, _) <- Loader.loadName (hscInterp hsc_env) hsc_env (varName id) cvReconstructType hsc_env bound (idType id) hv mkRuntimeUnkTyVar :: Name -> Kind -> TyVar mkRuntimeUnkTyVar name kind = mkTcTyVar name kind RuntimeUnk