ghcide-1.8.0.0: src/Development/IDE/Core/Compile.hs
-- Copyright (c) 2019 The DAML Authors. All rights reserved.
-- SPDX-License-Identifier: Apache-2.0
{-# LANGUAGE CPP #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE RankNTypes #-}
-- | Based on https://ghc.haskell.org/trac/ghc/wiki/Commentary/Compiler/API.
-- Given a list of paths to find libraries, and a file to compile, produce a list of 'CoreModule' values.
module Development.IDE.Core.Compile
( TcModuleResult(..)
, RunSimplifier(..)
, compileModule
, parseModule
, typecheckModule
, computePackageDeps
, addRelativeImport
, mkHiFileResultCompile
, mkHiFileResultNoCompile
, generateObjectCode
, generateByteCode
, generateHieAsts
, writeAndIndexHieFile
, indexHieFile
, writeHiFile
, getModSummaryFromImports
, loadHieFile
, loadInterface
, RecompilationInfo(..)
, loadModulesHome
, getDocsBatch
, lookupName
, mergeEnvs
, ml_core_file
, coreFileToLinkable
, TypecheckHelpers(..)
) where
import Control.Concurrent.Extra
import Control.Concurrent.STM.Stats hiding (orElse)
import Control.DeepSeq (NFData (..), force, liftRnf,
rnf, rwhnf)
import Control.Exception (evaluate)
import Control.Exception.Safe
import Control.Lens hiding (List, (<.>))
import Control.Monad.Except
import Control.Monad.Extra
import Control.Monad.Trans.Except
import qualified Control.Monad.Trans.State.Strict as S
import Data.Aeson (toJSON)
import Data.Bifunctor (first, second)
import Data.Binary
import qualified Data.ByteString as BS
import Data.Coerce
import qualified Data.DList as DL
import Data.Functor
import Data.Generics.Aliases
import Data.Generics.Schemes
import qualified Data.HashMap.Strict as HashMap
import Data.IntMap (IntMap)
import qualified Data.IntMap.Strict as IntMap
import Data.IORef
import Data.List.Extra
import Data.Map (Map)
import qualified Data.Map.Strict as Map
import qualified Data.Set as Set
import Data.Maybe
import qualified Data.Text as T
import Data.Time (UTCTime (..))
import Data.Tuple.Extra (dupe)
import Data.Unique as Unique
import Debug.Trace
import Development.IDE.Core.FileStore (resetInterfaceStore)
import Development.IDE.Core.Preprocessor
import Development.IDE.Core.RuleTypes
import Development.IDE.Core.Shake
import Development.IDE.Core.Tracing (withTrace)
import Development.IDE.GHC.Compat hiding (loadInterface,
parseHeader, parseModule,
tcRnModule, writeHieFile)
import qualified Development.IDE.GHC.Compat as Compat
import qualified Development.IDE.GHC.Compat as GHC
import qualified Development.IDE.GHC.Compat.Util as Util
import Development.IDE.GHC.CoreFile
import Development.IDE.GHC.Error
import Development.IDE.GHC.Orphans ()
import Development.IDE.GHC.Util
import Development.IDE.GHC.Warnings
import Development.IDE.Types.Diagnostics
import Development.IDE.Types.Location
import Development.IDE.Types.Options
import GHC (ForeignHValue,
GetDocsFailure (..),
GhcException (..),
parsedSource)
import qualified GHC.LanguageExtensions as LangExt
import GHC.Serialized
import HieDb
import qualified Language.LSP.Server as LSP
import Language.LSP.Types (DiagnosticTag (..))
import qualified Language.LSP.Types as LSP
import System.Directory
import System.FilePath
import System.IO.Extra (fixIO, newTempFileWithin)
import Unsafe.Coerce
#if !MIN_VERSION_ghc(8,10,0)
import ErrUtils
#endif
#if MIN_VERSION_ghc(9,0,1)
import GHC.Tc.Gen.Splice
#if MIN_VERSION_ghc(9,2,1)
import GHC.Types.ForeignStubs
import GHC.Types.HpcInfo
import GHC.Types.TypeEnv
#else
import GHC.Driver.Types
#endif
#else
import HscTypes
import TcSplice
#endif
#if MIN_VERSION_ghc(9,2,0)
import GHC (Anchor (anchor),
EpaComment (EpaComment),
EpaCommentTok (EpaBlockComment, EpaLineComment),
ModuleGraph, epAnnComments,
mgLookupModule,
mgModSummaries,
priorComments)
import qualified GHC as G
import GHC.Hs (LEpaComment)
import qualified GHC.Types.Error as Error
#endif
-- | Given a string buffer, return the string (after preprocessing) and the 'ParsedModule'.
parseModule
:: IdeOptions
-> HscEnv
-> FilePath
-> ModSummary
-> IO (IdeResult ParsedModule)
parseModule IdeOptions{..} env filename ms =
fmap (either (, Nothing) id) $
runExceptT $ do
(diag, modu) <- parseFileContents env optPreprocessor filename ms
return (diag, Just modu)
-- | Given a package identifier, what packages does it depend on
computePackageDeps
:: HscEnv
-> Unit
-> IO (Either [FileDiagnostic] [UnitId])
computePackageDeps env pkg = do
case lookupUnit env pkg of
Nothing -> return $ Left [ideErrorText (toNormalizedFilePath' noFilePath) $
T.pack $ "unknown package: " ++ show pkg]
Just pkgInfo -> return $ Right $ unitDepends pkgInfo
data TypecheckHelpers
= TypecheckHelpers
{ getLinkablesToKeep :: !(IO (ModuleEnv UTCTime))
, getLinkables :: !([NormalizedFilePath] -> IO [LinkableResult])
}
typecheckModule :: IdeDefer
-> HscEnv
-> TypecheckHelpers
-> ParsedModule
-> IO (IdeResult TcModuleResult)
typecheckModule (IdeDefer defer) hsc tc_helpers pm = do
let modSummary = pm_mod_summary pm
dflags = ms_hspp_opts modSummary
mmodSummary' <- catchSrcErrors (hsc_dflags hsc) "typecheck (initialize plugins)"
(initPlugins hsc modSummary)
case mmodSummary' of
Left errs -> return (errs, Nothing)
Right modSummary' -> do
(warnings, etcm) <- withWarnings "typecheck" $ \tweak ->
let
session = tweak (hscSetFlags dflags hsc)
-- TODO: maybe settings ms_hspp_opts is unnecessary?
mod_summary'' = modSummary' { ms_hspp_opts = hsc_dflags session}
in
catchSrcErrors (hsc_dflags hsc) "typecheck" $ do
tcRnModule session tc_helpers $ demoteIfDefer pm{pm_mod_summary = mod_summary''}
let errorPipeline = unDefer . hideDiag dflags . tagDiag
diags = map errorPipeline warnings
deferedError = any fst diags
case etcm of
Left errs -> return (map snd diags ++ errs, Nothing)
Right tcm -> return (map snd diags, Just $ tcm{tmrDeferedError = deferedError})
where
demoteIfDefer = if defer then demoteTypeErrorsToWarnings else id
-- | Install hooks to capture the splices as well as the runtime module dependencies
captureSplicesAndDeps :: TypecheckHelpers -> HscEnv -> (HscEnv -> IO a) -> IO (a, Splices, ModuleEnv BS.ByteString)
captureSplicesAndDeps TypecheckHelpers{..} env k = do
splice_ref <- newIORef mempty
dep_ref <- newIORef emptyModuleEnv
res <- k (hscSetHooks (addSpliceHook splice_ref . addLinkableDepHook dep_ref $ hsc_hooks env) env)
splices <- readIORef splice_ref
needed_mods <- readIORef dep_ref
return (res, splices, needed_mods)
where
addLinkableDepHook :: IORef (ModuleEnv BS.ByteString) -> Hooks -> Hooks
addLinkableDepHook var h = h { hscCompileCoreExprHook = Just (compile_bco_hook var) }
-- We want to record exactly which linkables/modules the typechecker needed at runtime
-- This is useful for recompilation checking.
-- See Note [Recompilation avoidance in the presence of TH]
--
-- From hscCompileCoreExpr' in GHC
-- To update, copy hscCompileCoreExpr' (the implementation of
-- hscCompileCoreExprHook) verbatim, and add code to extract all the free
-- names in the compiled bytecode, recording the modules that those names
-- come from in the IORef,, as these are the modules on whose implementation
-- we depend.
compile_bco_hook :: IORef (ModuleEnv BS.ByteString) -> HscEnv -> SrcSpan -> CoreExpr
#if MIN_VERSION_ghc(9,3,0)
-> IO (ForeignHValue, [Linkable], PkgsLoaded)
#else
-> IO ForeignHValue
#endif
compile_bco_hook var hsc_env srcspan ds_expr
= do { let dflags = hsc_dflags hsc_env
{- Simplify it -}
; simpl_expr <- simplifyExpr dflags hsc_env ds_expr
{- Tidy it (temporary, until coreSat does cloning) -}
; let tidy_expr = tidyExpr emptyTidyEnv simpl_expr
{- Prepare for codegen -}
; prepd_expr <- corePrepExpr dflags hsc_env tidy_expr
{- Lint if necessary -}
; lintInteractiveExpr "hscCompileExpr" hsc_env prepd_expr
#if MIN_VERSION_ghc(9,2,0)
; let iNTERACTIVELoc = G.ModLocation{ ml_hs_file = Nothing,
ml_hi_file = panic "hscCompileCoreExpr':ml_hi_file",
ml_obj_file = panic "hscCompileCoreExpr':ml_obj_file",
#if MIN_VERSION_ghc(9,3,0)
ml_dyn_obj_file = panic "hscCompileCoreExpr':ml_dyn_obj_file",
ml_dyn_hi_file = panic "hscCompileCoreExpr':ml_dyn_hi_file",
#endif
ml_hie_file = panic "hscCompileCoreExpr':ml_hie_file"
}
; let ictxt = hsc_IC hsc_env
; (binding_id, stg_expr, _, _) <-
myCoreToStgExpr (hsc_logger hsc_env)
(hsc_dflags hsc_env)
ictxt
#if MIN_VERSION_ghc(9,3,0)
True -- for bytecode
#endif
(icInteractiveModule ictxt)
iNTERACTIVELoc
prepd_expr
{- Convert to BCOs -}
; bcos <- byteCodeGen hsc_env
(icInteractiveModule ictxt)
stg_expr
[] Nothing
#else
{- Convert to BCOs -}
; bcos <- coreExprToBCOs hsc_env
(icInteractiveModule (hsc_IC hsc_env)) prepd_expr
#endif
-- Exclude wired-in names because we may not have read
-- their interface files, so getLinkDeps will fail
-- All wired-in names are in the base package, which we link
-- by default, so we can safely ignore them here.
-- Find the linkables for the modules we need
; let needed_mods = mkUniqSet [
#if MIN_VERSION_ghc(9,3,0)
mod -- We need the whole module for 9.4 because of multiple home units modules may have different unit ids
#else
moduleName mod -- On <= 9.2, just the name is enough because all unit ids will be the same
#endif
#if MIN_VERSION_ghc(9,2,0)
| n <- concatMap (uniqDSetToList . bcoFreeNames) $ bc_bcos bcos
#else
| n <- uniqDSetToList (bcoFreeNames bcos)
#endif
, Just mod <- [nameModule_maybe n] -- Names from other modules
, not (isWiredInName n) -- Exclude wired-in names
, moduleUnitId mod `elem` home_unit_ids -- Only care about stuff from the home package set
]
home_unit_ids =
#if MIN_VERSION_ghc(9,3,0)
map fst (hugElts $ hsc_HUG hsc_env)
#else
[homeUnitId_ dflags]
#endif
mods_transitive = getTransitiveMods hsc_env needed_mods
-- If we don't support multiple home units, ModuleNames are sufficient because all the units will be the same
mods_transitive_list =
#if MIN_VERSION_ghc(9,3,0)
mapMaybe nodeKeyToInstalledModule $ Set.toList mods_transitive
#else
-- Non det OK as we will put it into maps later anyway
map (Compat.installedModule (homeUnitId_ dflags)) $ nonDetEltsUniqSet mods_transitive
#endif
#if MIN_VERSION_ghc(9,3,0)
; moduleLocs <- readIORef (fcModuleCache $ hsc_FC hsc_env)
#else
; moduleLocs <- readIORef (hsc_FC hsc_env)
#endif
; lbs <- getLinkables [toNormalizedFilePath' file
| mod <- mods_transitive_list
, let ifr = fromJust $ lookupInstalledModuleEnv moduleLocs mod
file = case ifr of
InstalledFound loc _ ->
fromJust $ ml_hs_file loc
_ -> panic "hscCompileCoreExprHook: module not found"
]
; let hsc_env' = loadModulesHome (map linkableHomeMod lbs) hsc_env
-- Essential to do this here after we load the linkables
; keep_lbls <- getLinkablesToKeep
; unload hsc_env' $ map (\(mod, time) -> LM time mod []) $ moduleEnvToList keep_lbls
#if MIN_VERSION_ghc(9,3,0)
{- load it -}
; (fv_hvs, lbss, pkgs) <- loadDecls (hscInterp hsc_env') hsc_env' srcspan bcos
; let hval = ((expectJust "hscCompileCoreExpr'" $ lookup (idName binding_id) fv_hvs), lbss, pkgs)
#elif MIN_VERSION_ghc(9,2,0)
{- load it -}
; fv_hvs <- loadDecls (hscInterp hsc_env') hsc_env' srcspan bcos
; let hval = (expectJust "hscCompileCoreExpr'" $ lookup (idName binding_id) fv_hvs)
#else
{- link it -}
; hval <- linkExpr hsc_env' srcspan bcos
#endif
; modifyIORef' var (flip extendModuleEnvList [(mi_module $ hm_iface hm, linkableHash lb) | lb <- lbs, let hm = linkableHomeMod lb])
; return hval }
#if MIN_VERSION_ghc(9,3,0)
-- TODO: support backpack
nodeKeyToInstalledModule :: NodeKey -> Maybe InstalledModule
nodeKeyToInstalledModule (NodeKey_Module (ModNodeKeyWithUid (GWIB mod _) uid)) = Just $ mkModule uid mod
nodeKeyToInstalledModule _ = Nothing
moduleToNodeKey :: Module -> NodeKey
moduleToNodeKey mod = NodeKey_Module $ ModNodeKeyWithUid (GWIB (moduleName mod) NotBoot) (moduleUnitId mod)
#endif
-- Compute the transitive set of linkables required
getTransitiveMods hsc_env needed_mods
#if MIN_VERSION_ghc(9,3,0)
= Set.unions (Set.fromList (map moduleToNodeKey mods) : [ dep | m <- mods
, Just dep <- [Map.lookup (moduleToNodeKey m) (mgTransDeps (hsc_mod_graph hsc_env))]
])
where mods = nonDetEltsUniqSet needed_mods -- OK because we put them into a set immediately after
#else
= go emptyUniqSet needed_mods
where
hpt = hsc_HPT hsc_env
go seen new
| isEmptyUniqSet new = seen
| otherwise = go seen' new'
where
seen' = seen `unionUniqSets` new
new' = new_deps `minusUniqSet` seen'
new_deps = unionManyUniqSets [ mkUniqSet $ getDependentMods $ hm_iface mod_info
| mod_info <- eltsUDFM $ udfmIntersectUFM hpt (getUniqSet new)]
#endif
-- | Add a Hook to the DynFlags which captures and returns the
-- typechecked splices before they are run. This information
-- is used for hover.
addSpliceHook :: IORef Splices -> Hooks -> Hooks
addSpliceHook var h = h { runMetaHook = Just (splice_hook (runMetaHook h) var) }
splice_hook :: Maybe (MetaHook TcM) -> IORef Splices -> MetaHook TcM
splice_hook (fromMaybe defaultRunMeta -> hook) var metaReq e = case metaReq of
(MetaE f) -> do
expr' <- metaRequestE hook e
liftIO $ modifyIORef' var $ exprSplicesL %~ ((e, expr') :)
pure $ f expr'
(MetaP f) -> do
pat' <- metaRequestP hook e
liftIO $ modifyIORef' var $ patSplicesL %~ ((e, pat') :)
pure $ f pat'
(MetaT f) -> do
type' <- metaRequestT hook e
liftIO $ modifyIORef' var $ typeSplicesL %~ ((e, type') :)
pure $ f type'
(MetaD f) -> do
decl' <- metaRequestD hook e
liftIO $ modifyIORef' var $ declSplicesL %~ ((e, decl') :)
pure $ f decl'
(MetaAW f) -> do
aw' <- metaRequestAW hook e
liftIO $ modifyIORef' var $ awSplicesL %~ ((e, aw') :)
pure $ f aw'
tcRnModule
:: HscEnv
-> TypecheckHelpers -- ^ Program linkables not to unload
-> ParsedModule
-> IO TcModuleResult
tcRnModule hsc_env tc_helpers pmod = do
let ms = pm_mod_summary pmod
hsc_env_tmp = hscSetFlags (ms_hspp_opts ms) hsc_env
((tc_gbl_env', mrn_info), splices, mod_env)
<- captureSplicesAndDeps tc_helpers hsc_env_tmp $ \hsc_env_tmp ->
do hscTypecheckRename hsc_env_tmp ms $
HsParsedModule { hpm_module = parsedSource pmod,
hpm_src_files = pm_extra_src_files pmod,
hpm_annotations = pm_annotations pmod }
let rn_info = case mrn_info of
Just x -> x
Nothing -> error "no renamed info tcRnModule"
-- Serialize mod_env so we can read it from the interface
mod_env_anns = map (\(mod, hash) -> Annotation (ModuleTarget mod) $ toSerialized BS.unpack hash)
(moduleEnvToList mod_env)
tc_gbl_env = tc_gbl_env' { tcg_ann_env = extendAnnEnvList (tcg_ann_env tc_gbl_env') mod_env_anns }
pure (TcModuleResult pmod rn_info tc_gbl_env splices False mod_env)
mkHiFileResultNoCompile :: HscEnv -> TcModuleResult -> IO HiFileResult
mkHiFileResultNoCompile session tcm = do
let hsc_env_tmp = hscSetFlags (ms_hspp_opts ms) session
ms = pm_mod_summary $ tmrParsed tcm
tcGblEnv = tmrTypechecked tcm
details <- makeSimpleDetails hsc_env_tmp tcGblEnv
sf <- finalSafeMode (ms_hspp_opts ms) tcGblEnv
iface <- mkIfaceTc hsc_env_tmp sf details ms tcGblEnv
pure $! mkHiFileResult ms iface details (tmrRuntimeModules tcm) Nothing
mkHiFileResultCompile
:: ShakeExtras
-> HscEnv
-> TcModuleResult
-> ModGuts
-> IO (IdeResult HiFileResult)
mkHiFileResultCompile se session' tcm simplified_guts = catchErrs $ do
let session = hscSetFlags (ms_hspp_opts ms) session'
ms = pm_mod_summary $ tmrParsed tcm
tcGblEnv = tmrTypechecked tcm
(details, mguts) <-
if mg_hsc_src simplified_guts == HsBootFile
then do
details <- mkBootModDetailsTc session tcGblEnv
pure (details, Nothing)
else do
-- write core file
-- give variables unique OccNames
tidy_opts <- initTidyOpts session
(guts, details) <- tidyProgram tidy_opts simplified_guts
pure (details, Just guts)
#if MIN_VERSION_ghc(9,0,1)
let !partial_iface = force $ mkPartialIface session details
#if MIN_VERSION_ghc(9,3,0)
ms
#endif
simplified_guts
final_iface <- mkFullIface session partial_iface Nothing
#if MIN_VERSION_ghc(9,4,2)
Nothing
#endif
#elif MIN_VERSION_ghc(8,10,0)
let !partial_iface = force (mkPartialIface session details simplified_guts)
final_iface <- mkFullIface session partial_iface
#else
(final_iface,_) <- mkIface session Nothing details simplified_guts
#endif
-- Write the core file now
core_file <- case mguts of
Nothing -> pure Nothing -- no guts, likely boot file
Just guts -> do
let core_fp = ml_core_file $ ms_location ms
core_file = codeGutsToCoreFile iface_hash guts
iface_hash = getModuleHash final_iface
core_hash1 <- atomicFileWrite se core_fp $ \fp ->
writeBinCoreFile fp core_file
-- We want to drop references to guts and read in a serialized, compact version
-- of the core file from disk (as it is deserialised lazily)
-- This is because we don't want to keep the guts in memeory for every file in
-- the project as it becomes prohibitively expensive
-- The serialized file however is much more compact and only requires a few
-- hundred megabytes of memory total even in a large project with 1000s of
-- modules
(core_file, !core_hash2) <- readBinCoreFile (mkUpdater $ hsc_NC session) core_fp
pure $ assert (core_hash1 == core_hash2)
$ Just (core_file, fingerprintToBS core_hash2)
-- Verify core file by rountrip testing and comparison
IdeOptions{optVerifyCoreFile} <- getIdeOptionsIO se
case core_file of
Just (core, _) | optVerifyCoreFile -> do
let core_fp = ml_core_file $ ms_location ms
traceIO $ "Verifying " ++ core_fp
let CgGuts{cg_binds = unprep_binds, cg_tycons = tycons } = case mguts of
Nothing -> error "invariant optVerifyCoreFile: guts must exist if linkable exists"
Just g -> g
mod = ms_mod ms
data_tycons = filter isDataTyCon tycons
CgGuts{cg_binds = unprep_binds'} <- coreFileToCgGuts session final_iface details core
-- Run corePrep first as we want to test the final version of the program that will
-- get translated to STG/Bytecode
#if MIN_VERSION_ghc(9,3,0)
prepd_binds
#else
(prepd_binds , _)
#endif
<- corePrepPgm session mod (ms_location ms) unprep_binds data_tycons
#if MIN_VERSION_ghc(9,3,0)
prepd_binds'
#else
(prepd_binds', _)
#endif
<- corePrepPgm session mod (ms_location ms) unprep_binds' data_tycons
let binds = noUnfoldings $ (map flattenBinds . (:[])) $ prepd_binds
binds' = noUnfoldings $ (map flattenBinds . (:[])) $ prepd_binds'
-- diffBinds is unreliable, sometimes it goes down the wrong track.
-- This fixes the order of the bindings so that it is less likely to do so.
diffs2 = concat $ flip S.evalState (mkRnEnv2 emptyInScopeSet) $ zipWithM go binds binds'
-- diffs1 = concat $ flip S.evalState (mkRnEnv2 emptyInScopeSet) $ zipWithM go (map (:[]) $ concat binds) (map (:[]) $ concat binds')
-- diffs3 = flip S.evalState (mkRnEnv2 emptyInScopeSet) $ go (concat binds) (concat binds')
diffs = diffs2
go x y = S.state $ \s -> diffBinds True s x y
-- The roundtrip doesn't preserver OtherUnfolding or occInfo, but neither are of these
-- are used for generate core or bytecode, so we can safely ignore them
-- SYB is slow but fine given that this is only used for testing
noUnfoldings = everywhere $ mkT $ \v -> if isId v
then
let v' = if isOtherUnfolding (realIdUnfolding v) then (setIdUnfolding v noUnfolding) else v
in setIdOccInfo v' noOccInfo
else v
isOtherUnfolding (OtherCon _) = True
isOtherUnfolding _ = False
when (not $ null diffs) $
panicDoc "verify core failed!" (vcat $ punctuate (text "\n\n") (diffs )) -- ++ [ppr binds , ppr binds']))
_ -> pure ()
pure ([], Just $! mkHiFileResult ms final_iface details (tmrRuntimeModules tcm) core_file)
where
dflags = hsc_dflags session'
source = "compile"
catchErrs x = x `catches`
[ Handler $ return . (,Nothing) . diagFromGhcException source dflags
, Handler $ return . (,Nothing) . diagFromString source DsError (noSpan "<internal>")
. (("Error during " ++ T.unpack source) ++) . show @SomeException
]
initPlugins :: HscEnv -> ModSummary -> IO ModSummary
initPlugins session modSummary = do
session1 <- liftIO $ initializePlugins (hscSetFlags (ms_hspp_opts modSummary) session)
return modSummary{ms_hspp_opts = hsc_dflags session1}
-- | Whether we should run the -O0 simplifier when generating core.
--
-- This is required for template Haskell to work but we disable this in DAML.
-- See #256
newtype RunSimplifier = RunSimplifier Bool
-- | Compile a single type-checked module to a 'CoreModule' value, or
-- provide errors.
compileModule
:: RunSimplifier
-> HscEnv
-> ModSummary
-> TcGblEnv
-> IO (IdeResult ModGuts)
compileModule (RunSimplifier simplify) session ms tcg =
fmap (either (, Nothing) (second Just)) $
catchSrcErrors (hsc_dflags session) "compile" $ do
(warnings,desugared_guts) <- withWarnings "compile" $ \tweak -> do
let session' = tweak (hscSetFlags (ms_hspp_opts ms) session)
-- TODO: maybe settings ms_hspp_opts is unnecessary?
-- MP: the flags in ModSummary should be right, if they are wrong then
-- the correct place to fix this is when the ModSummary is created.
desugar <- hscDesugar session' (ms { ms_hspp_opts = hsc_dflags session' }) tcg
if simplify
then do
plugins <- readIORef (tcg_th_coreplugins tcg)
hscSimplify session' plugins desugar
else pure desugar
return (map snd warnings, desugared_guts)
generateObjectCode :: HscEnv -> ModSummary -> CgGuts -> IO (IdeResult Linkable)
generateObjectCode session summary guts = do
fmap (either (, Nothing) (second Just)) $
catchSrcErrors (hsc_dflags session) "object" $ do
let dot_o = ml_obj_file (ms_location summary)
mod = ms_mod summary
fp = replaceExtension dot_o "s"
createDirectoryIfMissing True (takeDirectory fp)
(warnings, dot_o_fp) <-
withWarnings "object" $ \tweak -> do
let env' = tweak (hscSetFlags (ms_hspp_opts summary) session)
target = platformDefaultBackend (hsc_dflags env')
newFlags = setBackend target $ updOptLevel 0 $ setOutputFile
#if MIN_VERSION_ghc(9,3,0)
(Just dot_o)
#else
dot_o
#endif
$ hsc_dflags env'
session' = hscSetFlags newFlags session
#if MIN_VERSION_ghc(9,4,2)
(outputFilename, _mStub, _foreign_files, _cinfos, _stgcinfos) <- hscGenHardCode session' guts
#elif MIN_VERSION_ghc(9,0,1)
(outputFilename, _mStub, _foreign_files, _cinfos) <- hscGenHardCode session' guts
#else
(outputFilename, _mStub, _foreign_files) <- hscGenHardCode session' guts
#endif
#if MIN_VERSION_ghc(8,10,0)
(ms_location summary)
#else
summary
#endif
fp
obj <- compileFile session' driverNoStop (outputFilename, Just (As False))
#if MIN_VERSION_ghc(9,3,0)
case obj of
Nothing -> throwGhcExceptionIO $ Panic "compileFile didn't generate object code"
Just x -> pure x
#else
return obj
#endif
let unlinked = DotO dot_o_fp
-- Need time to be the modification time for recompilation checking
t <- liftIO $ getModificationTime dot_o_fp
let linkable = LM t mod [unlinked]
pure (map snd warnings, linkable)
newtype CoreFileTime = CoreFileTime UTCTime
generateByteCode :: CoreFileTime -> HscEnv -> ModSummary -> CgGuts -> IO (IdeResult Linkable)
generateByteCode (CoreFileTime time) hscEnv summary guts = do
fmap (either (, Nothing) (second Just)) $
catchSrcErrors (hsc_dflags hscEnv) "bytecode" $ do
(warnings, (_, bytecode, sptEntries)) <-
withWarnings "bytecode" $ \_tweak -> do
let session = _tweak (hscSetFlags (ms_hspp_opts summary) hscEnv)
-- TODO: maybe settings ms_hspp_opts is unnecessary?
summary' = summary { ms_hspp_opts = hsc_dflags session }
hscInteractive session guts
#if MIN_VERSION_ghc(8,10,0)
(ms_location summary')
#else
summary'
#endif
let unlinked = BCOs bytecode sptEntries
let linkable = LM time (ms_mod summary) [unlinked]
pure (map snd warnings, linkable)
demoteTypeErrorsToWarnings :: ParsedModule -> ParsedModule
demoteTypeErrorsToWarnings =
(update_pm_mod_summary . update_hspp_opts) demoteTEsToWarns where
demoteTEsToWarns :: DynFlags -> DynFlags
-- convert the errors into warnings, and also check the warnings are enabled
demoteTEsToWarns = (`wopt_set` Opt_WarnDeferredTypeErrors)
. (`wopt_set` Opt_WarnTypedHoles)
. (`wopt_set` Opt_WarnDeferredOutOfScopeVariables)
. (`gopt_set` Opt_DeferTypeErrors)
. (`gopt_set` Opt_DeferTypedHoles)
. (`gopt_set` Opt_DeferOutOfScopeVariables)
update_hspp_opts :: (DynFlags -> DynFlags) -> ModSummary -> ModSummary
update_hspp_opts up ms = ms{ms_hspp_opts = up $ ms_hspp_opts ms}
update_pm_mod_summary :: (ModSummary -> ModSummary) -> ParsedModule -> ParsedModule
update_pm_mod_summary up pm =
pm{pm_mod_summary = up $ pm_mod_summary pm}
#if MIN_VERSION_ghc(9,3,0)
unDefer :: (Maybe DiagnosticReason, FileDiagnostic) -> (Bool, FileDiagnostic)
unDefer (Just (WarningWithFlag Opt_WarnDeferredTypeErrors) , fd) = (True, upgradeWarningToError fd)
unDefer (Just (WarningWithFlag Opt_WarnTypedHoles) , fd) = (True, upgradeWarningToError fd)
unDefer (Just (WarningWithFlag Opt_WarnDeferredOutOfScopeVariables), fd) = (True, upgradeWarningToError fd)
#else
unDefer :: (WarnReason, FileDiagnostic) -> (Bool, FileDiagnostic)
unDefer (Reason Opt_WarnDeferredTypeErrors , fd) = (True, upgradeWarningToError fd)
unDefer (Reason Opt_WarnTypedHoles , fd) = (True, upgradeWarningToError fd)
unDefer (Reason Opt_WarnDeferredOutOfScopeVariables, fd) = (True, upgradeWarningToError fd)
#endif
unDefer ( _ , fd) = (False, fd)
upgradeWarningToError :: FileDiagnostic -> FileDiagnostic
upgradeWarningToError (nfp, sh, fd) =
(nfp, sh, fd{_severity = Just DsError, _message = warn2err $ _message fd}) where
warn2err :: T.Text -> T.Text
warn2err = T.intercalate ": error:" . T.splitOn ": warning:"
#if MIN_VERSION_ghc(9,3,0)
hideDiag :: DynFlags -> (Maybe DiagnosticReason, FileDiagnostic) -> (Maybe DiagnosticReason, FileDiagnostic)
hideDiag originalFlags (w@(Just (WarningWithFlag warning)), (nfp, _sh, fd))
#else
hideDiag :: DynFlags -> (WarnReason, FileDiagnostic) -> (WarnReason, FileDiagnostic)
hideDiag originalFlags (w@(Reason warning), (nfp, _sh, fd))
#endif
| not (wopt warning originalFlags)
= (w, (nfp, HideDiag, fd))
hideDiag _originalFlags t = t
-- | Warnings which lead to a diagnostic tag
unnecessaryDeprecationWarningFlags :: [WarningFlag]
unnecessaryDeprecationWarningFlags
= [ Opt_WarnUnusedTopBinds
, Opt_WarnUnusedLocalBinds
, Opt_WarnUnusedPatternBinds
, Opt_WarnUnusedImports
, Opt_WarnUnusedMatches
, Opt_WarnUnusedTypePatterns
, Opt_WarnUnusedForalls
#if MIN_VERSION_ghc(8,10,0)
, Opt_WarnUnusedRecordWildcards
#endif
, Opt_WarnInaccessibleCode
, Opt_WarnWarningsDeprecations
]
-- | Add a unnecessary/deprecated tag to the required diagnostics.
#if MIN_VERSION_ghc(9,3,0)
tagDiag :: (Maybe DiagnosticReason, FileDiagnostic) -> (Maybe DiagnosticReason, FileDiagnostic)
tagDiag (w@(Just (WarningWithFlag warning)), (nfp, sh, fd))
#else
tagDiag :: (WarnReason, FileDiagnostic) -> (WarnReason, FileDiagnostic)
tagDiag (w@(Reason warning), (nfp, sh, fd))
#endif
| Just tag <- requiresTag warning
= (w, (nfp, sh, fd { _tags = addTag tag (_tags fd) }))
where
requiresTag :: WarningFlag -> Maybe DiagnosticTag
requiresTag Opt_WarnWarningsDeprecations
= Just DtDeprecated
requiresTag wflag -- deprecation was already considered above
| wflag `elem` unnecessaryDeprecationWarningFlags
= Just DtUnnecessary
requiresTag _ = Nothing
addTag :: DiagnosticTag -> Maybe (List DiagnosticTag) -> Maybe (List DiagnosticTag)
addTag t Nothing = Just (List [t])
addTag t (Just (List ts)) = Just (List (t : ts))
-- other diagnostics are left unaffected
tagDiag t = t
addRelativeImport :: NormalizedFilePath -> ModuleName -> DynFlags -> DynFlags
addRelativeImport fp modu dflags = dflags
{importPaths = nubOrd $ maybeToList (moduleImportPath fp modu) ++ importPaths dflags}
-- | Also resets the interface store
atomicFileWrite :: ShakeExtras -> FilePath -> (FilePath -> IO a) -> IO a
atomicFileWrite se targetPath write = do
let dir = takeDirectory targetPath
createDirectoryIfMissing True dir
(tempFilePath, cleanUp) <- newTempFileWithin dir
(write tempFilePath >>= \x -> renameFile tempFilePath targetPath >> atomically (resetInterfaceStore se (toNormalizedFilePath' targetPath)) >> pure x)
`onException` cleanUp
generateHieAsts :: HscEnv -> TcModuleResult -> IO ([FileDiagnostic], Maybe (HieASTs Type))
generateHieAsts hscEnv tcm =
handleGenerationErrors' dflags "extended interface generation" $ runHsc hscEnv $ do
-- These varBinds use unitDataConId but it could be anything as the id name is not used
-- during the hie file generation process. It's a workaround for the fact that the hie modules
-- don't export an interface which allows for additional information to be added to hie files.
let fake_splice_binds = Util.listToBag (map (mkVarBind unitDataConId) (spliceExpresions $ tmrTopLevelSplices tcm))
real_binds = tcg_binds $ tmrTypechecked tcm
#if MIN_VERSION_ghc(9,0,1)
ts = tmrTypechecked tcm :: TcGblEnv
top_ev_binds = tcg_ev_binds ts :: Util.Bag EvBind
insts = tcg_insts ts :: [ClsInst]
tcs = tcg_tcs ts :: [TyCon]
run ts $
#if MIN_VERSION_ghc(9,3,0)
pure $ Just $
#else
Just <$>
#endif
GHC.enrichHie (fake_splice_binds `Util.unionBags` real_binds) (tmrRenamed tcm) top_ev_binds insts tcs
#else
Just <$> GHC.enrichHie (fake_splice_binds `Util.unionBags` real_binds) (tmrRenamed tcm)
#endif
where
dflags = hsc_dflags hscEnv
#if MIN_VERSION_ghc(9,0,0)
run ts =
#if MIN_VERSION_ghc(9,2,0) && !MIN_VERSION_ghc(9,3,0)
fmap (join . snd) . liftIO . initDs hscEnv ts
#else
id
#endif
#endif
spliceExpresions :: Splices -> [LHsExpr GhcTc]
spliceExpresions Splices{..} =
DL.toList $ mconcat
[ DL.fromList $ map fst exprSplices
, DL.fromList $ map fst patSplices
, DL.fromList $ map fst typeSplices
, DL.fromList $ map fst declSplices
, DL.fromList $ map fst awSplices
]
-- | In addition to indexing the `.hie` file, this function is responsible for
-- maintaining the 'IndexQueue' state and notfiying the user about indexing
-- progress.
--
-- We maintain a record of all pending index operations in the 'indexPending'
-- TVar.
-- When 'indexHieFile' is called, it must check to ensure that the file hasn't
-- already be queued up for indexing. If it has, then we can just skip it
--
-- Otherwise, we record the current file as pending and write an indexing
-- operation to the queue
--
-- When the indexing operation is picked up and executed by the worker thread,
-- the first thing it does is ensure that a newer index for the same file hasn't
-- been scheduled by looking at 'indexPending'. If a newer index has been
-- scheduled, we can safely skip this one
--
-- Otherwise, we start or continue a progress reporting session, telling it
-- about progress so far and the current file we are attempting to index. Then
-- we can go ahead and call in to hiedb to actually do the indexing operation
--
-- Once this completes, we have to update the 'IndexQueue' state. First, we
-- must remove the just indexed file from 'indexPending' Then we check if
-- 'indexPending' is now empty. In that case, we end the progress session and
-- report the total number of file indexed. We also set the 'indexCompleted'
-- TVar to 0 in order to set it up for a fresh indexing session. Otherwise, we
-- can just increment the 'indexCompleted' TVar and exit.
--
indexHieFile :: ShakeExtras -> ModSummary -> NormalizedFilePath -> Util.Fingerprint -> Compat.HieFile -> IO ()
indexHieFile se mod_summary srcPath !hash hf = do
IdeOptions{optProgressStyle} <- getIdeOptionsIO se
atomically $ do
pending <- readTVar indexPending
case HashMap.lookup srcPath pending of
Just pendingHash | pendingHash == hash -> pure () -- An index is already scheduled
_ -> do
-- hiedb doesn't use the Haskell src, so we clear it to avoid unnecessarily keeping it around
let !hf' = hf{hie_hs_src = mempty}
modifyTVar' indexPending $ HashMap.insert srcPath hash
writeTQueue indexQueue $ \withHieDb -> do
-- We are now in the worker thread
-- Check if a newer index of this file has been scheduled, and if so skip this one
newerScheduled <- atomically $ do
pending <- readTVar indexPending
pure $ case HashMap.lookup srcPath pending of
Nothing -> False
-- If the hash in the pending list doesn't match the current hash, then skip
Just pendingHash -> pendingHash /= hash
unless newerScheduled $ do
pre optProgressStyle
withHieDb (\db -> HieDb.addRefsFromLoaded db targetPath (HieDb.RealFile $ fromNormalizedFilePath srcPath) hash hf')
post
where
mod_location = ms_location mod_summary
targetPath = Compat.ml_hie_file mod_location
HieDbWriter{..} = hiedbWriter se
-- Get a progress token to report progress and update it for the current file
pre style = do
tok <- modifyVar indexProgressToken $ fmap dupe . \case
x@(Just _) -> pure x
-- Create a token if we don't already have one
Nothing -> do
case lspEnv se of
Nothing -> pure Nothing
Just env -> LSP.runLspT env $ do
u <- LSP.ProgressTextToken . T.pack . show . hashUnique <$> liftIO Unique.newUnique
-- TODO: Wait for the progress create response to use the token
_ <- LSP.sendRequest LSP.SWindowWorkDoneProgressCreate (LSP.WorkDoneProgressCreateParams u) (const $ pure ())
LSP.sendNotification LSP.SProgress $ LSP.ProgressParams u $
LSP.Begin $ LSP.WorkDoneProgressBeginParams
{ _title = "Indexing"
, _cancellable = Nothing
, _message = Nothing
, _percentage = Nothing
}
pure (Just u)
(!done, !remaining) <- atomically $ do
done <- readTVar indexCompleted
remaining <- HashMap.size <$> readTVar indexPending
pure (done, remaining)
let
progressFrac :: Double
progressFrac = fromIntegral done / fromIntegral (done + remaining)
progressPct :: LSP.UInt
progressPct = floor $ 100 * progressFrac
whenJust (lspEnv se) $ \env -> whenJust tok $ \tok -> LSP.runLspT env $
LSP.sendNotification LSP.SProgress $ LSP.ProgressParams tok $
LSP.Report $
case style of
Percentage -> LSP.WorkDoneProgressReportParams
{ _cancellable = Nothing
, _message = Nothing
, _percentage = Just progressPct
}
Explicit -> LSP.WorkDoneProgressReportParams
{ _cancellable = Nothing
, _message = Just $
T.pack " (" <> T.pack (show done) <> "/" <> T.pack (show $ done + remaining) <> ")..."
, _percentage = Nothing
}
NoProgress -> LSP.WorkDoneProgressReportParams
{ _cancellable = Nothing
, _message = Nothing
, _percentage = Nothing
}
-- Report the progress once we are done indexing this file
post = do
mdone <- atomically $ do
-- Remove current element from pending
pending <- stateTVar indexPending $
dupe . HashMap.update (\pendingHash -> guard (pendingHash /= hash) $> pendingHash) srcPath
modifyTVar' indexCompleted (+1)
-- If we are done, report and reset completed
whenMaybe (HashMap.null pending) $
swapTVar indexCompleted 0
whenJust (lspEnv se) $ \env -> LSP.runLspT env $
when (coerce $ ideTesting se) $
LSP.sendNotification (LSP.SCustomMethod "ghcide/reference/ready") $
toJSON $ fromNormalizedFilePath srcPath
whenJust mdone $ \done ->
modifyVar_ indexProgressToken $ \tok -> do
whenJust (lspEnv se) $ \env -> LSP.runLspT env $
whenJust tok $ \tok ->
LSP.sendNotification LSP.SProgress $ LSP.ProgressParams tok $
LSP.End $ LSP.WorkDoneProgressEndParams
{ _message = Just $ "Finished indexing " <> T.pack (show done) <> " files"
}
-- We are done with the current indexing cycle, so destroy the token
pure Nothing
writeAndIndexHieFile :: HscEnv -> ShakeExtras -> ModSummary -> NormalizedFilePath -> [GHC.AvailInfo] -> HieASTs Type -> BS.ByteString -> IO [FileDiagnostic]
writeAndIndexHieFile hscEnv se mod_summary srcPath exports ast source =
handleGenerationErrors dflags "extended interface write/compression" $ do
hf <- runHsc hscEnv $
GHC.mkHieFile' mod_summary exports ast source
atomicFileWrite se targetPath $ flip GHC.writeHieFile hf
hash <- Util.getFileHash targetPath
indexHieFile se mod_summary srcPath hash hf
where
dflags = hsc_dflags hscEnv
mod_location = ms_location mod_summary
targetPath = Compat.ml_hie_file mod_location
writeHiFile :: ShakeExtras -> HscEnv -> HiFileResult -> IO [FileDiagnostic]
writeHiFile se hscEnv tc =
handleGenerationErrors dflags "interface write" $ do
atomicFileWrite se targetPath $ \fp ->
writeIfaceFile hscEnv fp modIface
where
modIface = hirModIface tc
targetPath = ml_hi_file $ ms_location $ hirModSummary tc
dflags = hsc_dflags hscEnv
handleGenerationErrors :: DynFlags -> T.Text -> IO () -> IO [FileDiagnostic]
handleGenerationErrors dflags source action =
action >> return [] `catches`
[ Handler $ return . diagFromGhcException source dflags
, Handler $ return . diagFromString source DsError (noSpan "<internal>")
. (("Error during " ++ T.unpack source) ++) . show @SomeException
]
handleGenerationErrors' :: DynFlags -> T.Text -> IO (Maybe a) -> IO ([FileDiagnostic], Maybe a)
handleGenerationErrors' dflags source action =
fmap ([],) action `catches`
[ Handler $ return . (,Nothing) . diagFromGhcException source dflags
, Handler $ return . (,Nothing) . diagFromString source DsError (noSpan "<internal>")
. (("Error during " ++ T.unpack source) ++) . show @SomeException
]
-- | Load modules, quickly. Input doesn't need to be desugared.
-- A module must be loaded before dependent modules can be typechecked.
-- This variant of loadModuleHome will *never* cause recompilation, it just
-- modifies the session.
-- The order modules are loaded is important when there are hs-boot files.
-- In particular you should make sure to load the .hs version of a file after the
-- .hs-boot version.
loadModulesHome
:: [HomeModInfo]
-> HscEnv
-> HscEnv
loadModulesHome mod_infos e =
#if MIN_VERSION_ghc(9,3,0)
hscUpdateHUG (\hug -> foldr addHomeModInfoToHug hug mod_infos) (e { hsc_type_env_vars = emptyKnotVars })
#else
let !new_modules = addListToHpt (hsc_HPT e) [(mod_name x, x) | x <- mod_infos]
in e { hsc_HPT = new_modules
, hsc_type_env_var = Nothing
}
where
mod_name = moduleName . mi_module . hm_iface
#endif
-- Merge the HPTs, module graphs and FinderCaches
-- See Note [GhcSessionDeps] in Development.IDE.Core.Rules
-- Add the current ModSummary to the graph, along with the
-- HomeModInfo's of all direct dependencies (by induction hypothesis all
-- transitive dependencies will be contained in envs)
#if MIN_VERSION_ghc(9,3,0)
mergeEnvs :: HscEnv -> (ModSummary, [NodeKey]) -> [HomeModInfo] -> [HscEnv] -> IO HscEnv
mergeEnvs env (ms, deps) extraMods envs = do
let im = Compat.installedModule (toUnitId $ moduleUnit $ ms_mod ms) (moduleName (ms_mod ms))
ifr = InstalledFound (ms_location ms) im
curFinderCache = Compat.extendInstalledModuleEnv Compat.emptyInstalledModuleEnv im ifr
-- Very important to force this as otherwise the hsc_mod_graph field is not
-- forced and ends up retaining a reference to all the old hsc_envs we have merged to get
-- this new one, which in turn leads to the EPS referencing the HPT.
module_graph_nodes =
nubOrdOn mkNodeKey (ModuleNode deps ms : concatMap (mgModSummaries' . hsc_mod_graph) envs)
newFinderCache <- concatFC curFinderCache (map hsc_FC envs)
liftRnf rwhnf module_graph_nodes `seq` (return $ loadModulesHome extraMods $
let newHug = foldl' mergeHUG (hsc_HUG env) (map hsc_HUG envs) in
(hscUpdateHUG (const newHug) env){
hsc_FC = newFinderCache,
hsc_mod_graph = mkModuleGraph module_graph_nodes
})
where
mergeHUG (UnitEnvGraph a) (UnitEnvGraph b) = UnitEnvGraph $ Map.unionWith mergeHUE a b
mergeHUE a b = a { homeUnitEnv_hpt = mergeUDFM (homeUnitEnv_hpt a) (homeUnitEnv_hpt b) }
mergeUDFM = plusUDFM_C combineModules
combineModules a b
| HsSrcFile <- mi_hsc_src (hm_iface a) = a
| otherwise = b
concatFC :: FinderCacheState -> [FinderCache] -> IO FinderCache
concatFC cur xs = do
fcModules <- mapM (readIORef . fcModuleCache) xs
fcFiles <- mapM (readIORef . fcFileCache) xs
fcModules' <- newIORef $! foldl' (plusInstalledModuleEnv const) cur fcModules
fcFiles' <- newIORef $! Map.unions fcFiles
pure $ FinderCache fcModules' fcFiles'
#else
mergeEnvs :: HscEnv -> ModSummary -> [HomeModInfo] -> [HscEnv] -> IO HscEnv
mergeEnvs env ms extraMods envs = do
prevFinderCache <- concatFC <$> mapM (readIORef . hsc_FC) envs
let im = Compat.installedModule (toUnitId $ moduleUnit $ ms_mod ms) (moduleName (ms_mod ms))
ifr = InstalledFound (ms_location ms) im
-- Very important to force this as otherwise the hsc_mod_graph field is not
-- forced and ends up retaining a reference to all the old hsc_envs we have merged to get
-- this new one, which in turn leads to the EPS referencing the HPT.
module_graph_nodes =
#if MIN_VERSION_ghc(9,2,0)
-- We don't do any instantiation for backpack at this point of time, so it is OK to use
-- 'extendModSummaryNoDeps'.
-- This may have to change in the future.
map extendModSummaryNoDeps $
#endif
nubOrdOn ms_mod (ms : concatMap (mgModSummaries . hsc_mod_graph) envs)
newFinderCache <- newIORef $! Compat.extendInstalledModuleEnv prevFinderCache im ifr
liftRnf rwhnf module_graph_nodes `seq` (return $ loadModulesHome extraMods $
env{
hsc_HPT = foldMapBy mergeUDFM emptyUDFM hsc_HPT envs,
hsc_FC = newFinderCache,
hsc_mod_graph = mkModuleGraph module_graph_nodes
})
where
mergeUDFM = plusUDFM_C combineModules
combineModules a b
| HsSrcFile <- mi_hsc_src (hm_iface a) = a
| otherwise = b
-- required because 'FinderCache':
-- 1) doesn't have a 'Monoid' instance,
-- 2) is abstract and doesn't export constructors
-- To work around this, we coerce to the underlying type
-- To remove this, I plan to upstream the missing Monoid instance
concatFC :: [FinderCache] -> FinderCache
concatFC = unsafeCoerce (mconcat @(Map InstalledModule InstalledFindResult))
#endif
withBootSuffix :: HscSource -> ModLocation -> ModLocation
withBootSuffix HsBootFile = addBootSuffixLocnOut
withBootSuffix _ = id
-- | Given a buffer, env and filepath, produce a module summary by parsing only the imports.
-- Runs preprocessors as needed.
getModSummaryFromImports
:: HscEnv
-> FilePath
-> UTCTime
-> Maybe Util.StringBuffer
-> ExceptT [FileDiagnostic] IO ModSummaryResult
getModSummaryFromImports env fp modTime contents = do
(contents, opts, dflags) <- preprocessor env fp contents
-- The warns will hopefully be reported when we actually parse the module
(_warns, L main_loc hsmod) <- parseHeader dflags fp contents
-- Copied from `HeaderInfo.getImports`, but we also need to keep the parsed imports
let mb_mod = hsmodName hsmod
imps = hsmodImports hsmod
mod = fmap unLoc mb_mod `Util.orElse` mAIN_NAME
(src_idecls, ord_idecls) = partition ((== IsBoot) . ideclSource.unLoc) imps
-- GHC.Prim doesn't exist physically, so don't go looking for it.
(ordinary_imps, ghc_prim_imports)
= partition ((/= moduleName gHC_PRIM) . unLoc
. ideclName . unLoc)
ord_idecls
implicit_prelude = xopt LangExt.ImplicitPrelude dflags
implicit_imports = mkPrelImports mod main_loc
implicit_prelude imps
convImport (L _ i) = (
#if !MIN_VERSION_ghc (9,3,0)
fmap sl_fs
#endif
(ideclPkgQual i)
, reLoc $ ideclName i)
msrImports = implicit_imports ++ imps
#if MIN_VERSION_ghc (9,3,0)
rn_pkg_qual = renameRawPkgQual (hsc_unit_env env)
rn_imps = fmap (\(pk, lmn@(L _ mn)) -> (rn_pkg_qual mn pk, lmn))
srcImports = rn_imps $ map convImport src_idecls
textualImports = rn_imps $ map convImport (implicit_imports ++ ordinary_imps)
ghc_prim_import = not (null ghc_prim_imports)
#else
srcImports = map convImport src_idecls
textualImports = map convImport (implicit_imports ++ ordinary_imps)
#endif
-- Force bits that might keep the string buffer and DynFlags alive unnecessarily
liftIO $ evaluate $ rnf srcImports
liftIO $ evaluate $ rnf textualImports
#if MIN_VERSION_ghc (9,3,0)
!src_hash <- liftIO $ fingerprintFromStringBuffer contents
#endif
modLoc <- liftIO $ if mod == mAIN_NAME
-- specially in tests it's common to have lots of nameless modules
-- mkHomeModLocation will map them to the same hi/hie locations
then mkHomeModLocation dflags (pathToModuleName fp) fp
else mkHomeModLocation dflags mod fp
let modl = mkHomeModule (hscHomeUnit (hscSetFlags dflags env)) mod
sourceType = if "-boot" `isSuffixOf` takeExtension fp then HsBootFile else HsSrcFile
msrModSummary =
ModSummary
{ ms_mod = modl
#if MIN_VERSION_ghc(8,8,0)
, ms_hie_date = Nothing
#endif
#if MIN_VERSION_ghc(9,3,0)
, ms_dyn_obj_date = Nothing
, ms_ghc_prim_import = ghc_prim_import
, ms_hs_hash = src_hash
#else
, ms_hs_date = modTime
#endif
, ms_hsc_src = sourceType
-- The contents are used by the GetModSummary rule
, ms_hspp_buf = Just contents
, ms_hspp_file = fp
, ms_hspp_opts = dflags
, ms_iface_date = Nothing
, ms_location = withBootSuffix sourceType modLoc
, ms_obj_date = Nothing
, ms_parsed_mod = Nothing
, ms_srcimps = srcImports
, ms_textual_imps = textualImports
}
msrFingerprint <- liftIO $ computeFingerprint opts msrModSummary
return ModSummaryResult{..}
where
-- Compute a fingerprint from the contents of `ModSummary`,
-- eliding the timestamps, the preprocessed source and other non relevant fields
computeFingerprint opts ModSummary{..} = do
fingerPrintImports <- fingerprintFromPut $ do
put $ Util.uniq $ moduleNameFS $ moduleName ms_mod
forM_ (ms_srcimps ++ ms_textual_imps) $ \(mb_p, m) -> do
put $ Util.uniq $ moduleNameFS $ unLoc m
#if MIN_VERSION_ghc(9,3,0)
case mb_p of
G.NoPkgQual -> pure ()
G.ThisPkg uid -> put $ getKey $ getUnique uid
G.OtherPkg uid -> put $ getKey $ getUnique uid
#else
whenJust mb_p $ put . Util.uniq
#endif
return $! Util.fingerprintFingerprints $
[ Util.fingerprintString fp
, fingerPrintImports
] ++ map Util.fingerprintString opts
-- | Parse only the module header
parseHeader
:: Monad m
=> DynFlags -- ^ flags to use
-> FilePath -- ^ the filename (for source locations)
-> Util.StringBuffer -- ^ Haskell module source text (full Unicode is supported)
#if MIN_VERSION_ghc(9,0,1)
-> ExceptT [FileDiagnostic] m ([FileDiagnostic], Located(HsModule))
#else
-> ExceptT [FileDiagnostic] m ([FileDiagnostic], Located(HsModule GhcPs))
#endif
parseHeader dflags filename contents = do
let loc = mkRealSrcLoc (Util.mkFastString filename) 1 1
case unP Compat.parseHeader (initParserState (initParserOpts dflags) contents loc) of
PFailedWithErrorMessages msgs ->
throwE $ diagFromErrMsgs "parser" dflags $ msgs dflags
POk pst rdr_module -> do
let (warns, errs) = getMessages' pst dflags
-- Just because we got a `POk`, it doesn't mean there
-- weren't errors! To clarify, the GHC parser
-- distinguishes between fatal and non-fatal
-- errors. Non-fatal errors are the sort that don't
-- prevent parsing from continuing (that is, a parse
-- tree can still be produced despite the error so that
-- further errors/warnings can be collected). Fatal
-- errors are those from which a parse tree just can't
-- be produced.
unless (null errs) $
throwE $ diagFromErrMsgs "parser" dflags errs
let warnings = diagFromErrMsgs "parser" dflags warns
return (warnings, rdr_module)
-- | Given a buffer, flags, and file path, produce a
-- parsed module (or errors) and any parse warnings. Does not run any preprocessors
-- ModSummary must contain the (preprocessed) contents of the buffer
parseFileContents
:: HscEnv
-> (GHC.ParsedSource -> IdePreprocessedSource)
-> FilePath -- ^ the filename (for source locations)
-> ModSummary
-> ExceptT [FileDiagnostic] IO ([FileDiagnostic], ParsedModule)
parseFileContents env customPreprocessor filename ms = do
let loc = mkRealSrcLoc (Util.mkFastString filename) 1 1
dflags = ms_hspp_opts ms
contents = fromJust $ ms_hspp_buf ms
case unP Compat.parseModule (initParserState (initParserOpts dflags) contents loc) of
PFailedWithErrorMessages msgs -> throwE $ diagFromErrMsgs "parser" dflags $ msgs dflags
POk pst rdr_module ->
let
hpm_annotations = mkApiAnns pst
(warns, errs) = getMessages' pst dflags
in
do
-- Just because we got a `POk`, it doesn't mean there
-- weren't errors! To clarify, the GHC parser
-- distinguishes between fatal and non-fatal
-- errors. Non-fatal errors are the sort that don't
-- prevent parsing from continuing (that is, a parse
-- tree can still be produced despite the error so that
-- further errors/warnings can be collected). Fatal
-- errors are those from which a parse tree just can't
-- be produced.
unless (null errs) $
throwE $ diagFromErrMsgs "parser" dflags errs
-- Ok, we got here. It's safe to continue.
let IdePreprocessedSource preproc_warns errs parsed = customPreprocessor rdr_module
unless (null errs) $
throwE $ diagFromStrings "parser" DsError errs
let preproc_warnings = diagFromStrings "parser" DsWarning preproc_warns
parsed' <- liftIO $ applyPluginsParsedResultAction env dflags ms hpm_annotations parsed
-- To get the list of extra source files, we take the list
-- that the parser gave us,
-- - eliminate files beginning with '<'. gcc likes to use
-- pseudo-filenames like "<built-in>" and "<command-line>"
-- - normalise them (eliminate differences between ./f and f)
-- - filter out the preprocessed source file
-- - filter out anything beginning with tmpdir
-- - remove duplicates
-- - filter out the .hs/.lhs source filename if we have one
--
let n_hspp = normalise filename
#if MIN_VERSION_ghc(9,3,0)
TempDir tmp_dir = tmpDir dflags
#else
tmp_dir = tmpDir dflags
#endif
srcs0 = nubOrd $ filter (not . (tmp_dir `isPrefixOf`))
$ filter (/= n_hspp)
$ map normalise
$ filter (not . isPrefixOf "<")
$ map Util.unpackFS
$ srcfiles pst
srcs1 = case ml_hs_file (ms_location ms) of
Just f -> filter (/= normalise f) srcs0
Nothing -> srcs0
-- sometimes we see source files from earlier
-- preprocessing stages that cannot be found, so just
-- filter them out:
srcs2 <- liftIO $ filterM doesFileExist srcs1
let pm = ParsedModule ms parsed' srcs2 hpm_annotations
warnings = diagFromErrMsgs "parser" dflags warns
pure (warnings ++ preproc_warnings, pm)
loadHieFile :: Compat.NameCacheUpdater -> FilePath -> IO GHC.HieFile
loadHieFile ncu f = do
GHC.hie_file_result <$> GHC.readHieFile ncu f
{- Note [Recompilation avoidance in the presence of TH]
Most versions of GHC we currently support don't have a working implementation of
code unloading for object code, and no version of GHC supports this on certain
platforms like Windows. This makes it completely infeasible for interactive use,
as symbols from previous compiles will shadow over all future compiles.
This means that we need to use bytecode when generating code for Template
Haskell. Unfortunately, we can't serialize bytecode, so we will always need
to recompile when the IDE starts. However, we can put in place a much tighter
recompilation avoidance scheme for subsequent compiles:
1. If the source file changes, then we always need to recompile
a. For files of interest, we will get explicit `textDocument/change` events
that will let us invalidate our build products
b. For files we read from disk, we can detect source file changes by
comparing the `mtime` of the source file with the build product (.hi/.o) file
on disk.
2. If GHC's recompilation avoidance scheme based on interface file hashes says
that we need to recompile, the we need to recompile.
3. If the file in question requires code generation then, we need to recompile
if we don't have the appropriate kind of build products.
a. If we already have the build products in memory, and the conditions 1 and
2 above hold, then we don't need to recompile
b. If we are generating object code, then we can also search for it on
disk and ensure it is up to date. Notably, we did _not_ previously re-use
old bytecode from memory when `hls-graph`/`shake` decided to rebuild the
`HiFileResult` for some reason
4. If the file in question used Template Haskell on the previous compile, then
we need to recompile if any `Linkable` in its transitive closure changed. This
sounds bad, but it is possible to make some improvements. In particular, we only
need to recompile if any of the `Linkable`s actually used during the previous
compile change.
How can we tell if a `Linkable` was actually used while running some TH?
GHC provides a `hscCompileCoreExprHook` which lets us intercept bytecode as
it is being compiled and linked. We can inspect the bytecode to see which
`Linkable` dependencies it requires, and record this for use in
recompilation checking.
We record all the home package modules of the free names that occur in the
bytecode. The `Linkable`s required are then the transitive closure of these
modules in the home-package environment. This is the same scheme as used by
GHC to find the correct things to link in before running bytecode.
This works fine if we already have previous build products in memory, but
what if we are reading an interface from disk? Well, we can smuggle in the
necessary information (linkable `Module`s required as well as the time they
were generated) using `Annotation`s, which provide a somewhat general purpose
way to serialise arbitrary information along with interface files.
Then when deciding whether to recompile, we need to check that the versions
(i.e. hashes) of the linkables used during a previous compile match whatever is
currently in the HPT.
As we always generate Linkables from core files, we use the core file hash
as a (hopefully) deterministic measure of whether the Linkable has changed.
This is better than using the object file hash (if we have one) because object
file generation is not deterministic.
-}
data RecompilationInfo m
= RecompilationInfo
{ source_version :: FileVersion
, old_value :: Maybe (HiFileResult, FileVersion)
, get_file_version :: NormalizedFilePath -> m (Maybe FileVersion)
, get_linkable_hashes :: [NormalizedFilePath] -> m [BS.ByteString]
, regenerate :: Maybe LinkableType -> m ([FileDiagnostic], Maybe HiFileResult) -- ^ Action to regenerate an interface
}
-- | Either a regular GHC linkable or a core file that
-- can be later turned into a proper linkable
data IdeLinkable = GhcLinkable !Linkable | CoreLinkable !UTCTime !CoreFile
instance NFData IdeLinkable where
rnf (GhcLinkable lb) = rnf lb
rnf (CoreLinkable time _) = rnf time
ml_core_file :: ModLocation -> FilePath
ml_core_file ml = ml_hi_file ml <.> "core"
-- | Retuns an up-to-date module interface, regenerating if needed.
-- Assumes file exists.
-- Requires the 'HscEnv' to be set up with dependencies
-- See Note [Recompilation avoidance in the presence of TH]
loadInterface
:: (MonadIO m, MonadMask m)
=> HscEnv
-> ModSummary
-> Maybe LinkableType
-> RecompilationInfo m
-> m ([FileDiagnostic], Maybe HiFileResult)
loadInterface session ms linkableNeeded RecompilationInfo{..} = do
let sessionWithMsDynFlags = hscSetFlags (ms_hspp_opts ms) session
mb_old_iface = hirModIface . fst <$> old_value
mb_old_version = snd <$> old_value
core_file = ml_core_file (ms_location ms)
iface_file = ml_hi_file (ms_location ms)
!mod = ms_mod ms
mb_dest_version <- case mb_old_version of
Just ver -> pure $ Just ver
Nothing -> get_file_version (toNormalizedFilePath' iface_file)
-- The source is modified if it is newer than the destination (iface file)
-- A more precise check for the core file is performed later
let sourceMod = case mb_dest_version of
Nothing -> SourceModified -- desitination file doesn't exist, assume modified source
Just dest_version
| source_version <= dest_version -> SourceUnmodified
| otherwise -> SourceModified
-- If mb_old_iface is nothing then checkOldIface will load it for us
-- given that the source is unmodified
(recomp_iface_reqd, mb_checked_iface)
#if MIN_VERSION_ghc(9,3,0)
<- liftIO $ checkOldIface sessionWithMsDynFlags ms mb_old_iface >>= \case
UpToDateItem x -> pure (UpToDate, Just x)
OutOfDateItem reason x -> pure (NeedsRecompile reason, x)
#else
<- liftIO $ checkOldIface sessionWithMsDynFlags ms sourceMod mb_old_iface
#endif
let do_regenerate _reason = withTrace "regenerate interface" $ \setTag -> do
setTag "Module" $ moduleNameString $ moduleName mod
setTag "Reason" $ showReason _reason
liftIO $ traceMarkerIO $ "regenerate interface " ++ show (moduleNameString $ moduleName mod, showReason _reason)
regenerate linkableNeeded
case (mb_checked_iface, recomp_iface_reqd) of
(Just iface, UpToDate) -> do
-- If we have an old value, just return it
case old_value of
Just (old_hir, _)
| isNothing linkableNeeded || isJust (hirCoreFp old_hir)
-> do
-- Peform the fine grained recompilation check for TH
maybe_recomp <- checkLinkableDependencies get_linkable_hashes (hsc_mod_graph sessionWithMsDynFlags) (hirRuntimeModules old_hir)
case maybe_recomp of
Just msg -> do_regenerate msg
Nothing -> return ([], Just old_hir)
-- Otherwise use the value from disk, provided the core file is up to date if required
_ -> do
details <- liftIO $ mkDetailsFromIface sessionWithMsDynFlags iface
-- parse the runtime dependencies from the annotations
let runtime_deps
| not (mi_used_th iface) = emptyModuleEnv
| otherwise = parseRuntimeDeps (md_anns details)
-- Peform the fine grained recompilation check for TH
maybe_recomp <- checkLinkableDependencies get_linkable_hashes (hsc_mod_graph sessionWithMsDynFlags) runtime_deps
case maybe_recomp of
Just msg -> do_regenerate msg
Nothing
| isJust linkableNeeded -> handleErrs $ do
(core_file@CoreFile{cf_iface_hash}, core_hash) <- liftIO $
readBinCoreFile (mkUpdater $ hsc_NC session) core_file
if cf_iface_hash == getModuleHash iface
then return ([], Just $ mkHiFileResult ms iface details runtime_deps (Just (core_file, fingerprintToBS core_hash)))
else do_regenerate (recompBecause "Core file out of date (doesn't match iface hash)")
| otherwise -> return ([], Just $ mkHiFileResult ms iface details runtime_deps Nothing)
where handleErrs = flip catches
[Handler $ \(e :: IOException) -> do_regenerate (recompBecause $ "Reading core file failed (" ++ show e ++ ")")
,Handler $ \(e :: GhcException) -> case e of
Signal _ -> throw e
Panic _ -> throw e
_ -> do_regenerate (recompBecause $ "Reading core file failed (" ++ show e ++ ")")
]
(_, _reason) -> do_regenerate _reason
-- | Find the runtime dependencies by looking at the annotations
-- serialized in the iface
-- The bytestrings are the hashes of the core files for modules we
-- required to run the TH splices in the given module.
-- See Note [Recompilation avoidance in the presence of TH]
parseRuntimeDeps :: [ModIfaceAnnotation] -> ModuleEnv BS.ByteString
parseRuntimeDeps anns = mkModuleEnv $ mapMaybe go anns
where
go (Annotation (ModuleTarget mod) payload)
| Just bs <- fromSerialized BS.pack payload
= Just (mod, bs)
go _ = Nothing
-- | checkLinkableDependencies compares the core files in the build graph to
-- the runtime dependencies of the module, to check if any of them are out of date
-- Hopefully 'runtime_deps' will be empty if the module didn't actually use TH
-- See Note [Recompilation avoidance in the presence of TH]
checkLinkableDependencies :: MonadIO m => ([NormalizedFilePath] -> m [BS.ByteString]) -> ModuleGraph -> ModuleEnv BS.ByteString -> m (Maybe RecompileRequired)
checkLinkableDependencies get_linkable_hashes graph runtime_deps = do
let hs_files = mapM go (moduleEnvToList runtime_deps)
go (mod, hash) = do
ms <- mgLookupModule graph mod
let hs = fromJust $ ml_hs_file $ ms_location ms
pure (toNormalizedFilePath' hs, hash)
case hs_files of
Nothing -> error "invalid module graph"
Just fs -> do
store_hashes <- get_linkable_hashes (map fst fs)
let out_of_date = [core_file | ((core_file, expected_hash), actual_hash) <- zip fs store_hashes, expected_hash /= actual_hash]
case out_of_date of
[] -> pure Nothing
_ -> pure $ Just $ recompBecause
$ "out of date runtime dependencies: " ++ intercalate ", " (map show out_of_date)
recompBecause =
#if MIN_VERSION_ghc(9,3,0)
NeedsRecompile .
#endif
RecompBecause
#if MIN_VERSION_ghc(9,3,0)
. CustomReason
#endif
#if MIN_VERSION_ghc(9,3,0)
data SourceModified = SourceModified | SourceUnmodified deriving (Eq, Ord, Show)
#endif
showReason :: RecompileRequired -> String
showReason UpToDate = "UpToDate"
#if MIN_VERSION_ghc(9,3,0)
showReason (NeedsRecompile MustCompile) = "MustCompile"
showReason (NeedsRecompile s) = printWithoutUniques s
#else
showReason MustCompile = "MustCompile"
showReason (RecompBecause s) = s
#endif
mkDetailsFromIface :: HscEnv -> ModIface -> IO ModDetails
mkDetailsFromIface session iface = do
fixIO $ \details -> do
let hsc' = hscUpdateHPT (\hpt -> addToHpt hpt (moduleName $ mi_module iface) (HomeModInfo iface details Nothing)) session
initIfaceLoad hsc' (typecheckIface iface)
coreFileToCgGuts :: HscEnv -> ModIface -> ModDetails -> CoreFile -> IO CgGuts
coreFileToCgGuts session iface details core_file = do
let act hpt = addToHpt hpt (moduleName this_mod)
(HomeModInfo iface details Nothing)
this_mod = mi_module iface
types_var <- newIORef (md_types details)
let hsc_env' = hscUpdateHPT act (session {
#if MIN_VERSION_ghc(9,3,0)
hsc_type_env_vars = knotVarsFromModuleEnv (mkModuleEnv [(this_mod, types_var)])
#else
hsc_type_env_var = Just (this_mod, types_var)
#endif
})
core_binds <- initIfaceCheck (text "l") hsc_env' $ typecheckCoreFile this_mod types_var core_file
-- Implicit binds aren't saved, so we need to regenerate them ourselves.
let implicit_binds = concatMap getImplicitBinds tyCons
tyCons = typeEnvTyCons (md_types details)
#if MIN_VERSION_ghc(9,3,0)
pure $ CgGuts this_mod tyCons (implicit_binds ++ core_binds) [] NoStubs [] mempty (emptyHpcInfo False) Nothing []
#else
pure $ CgGuts this_mod tyCons (implicit_binds ++ core_binds) NoStubs [] [] (emptyHpcInfo False) Nothing []
#endif
coreFileToLinkable :: LinkableType -> HscEnv -> ModSummary -> ModIface -> ModDetails -> CoreFile -> UTCTime -> IO ([FileDiagnostic], Maybe HomeModInfo)
coreFileToLinkable linkableType session ms iface details core_file t = do
cgi_guts <- coreFileToCgGuts session iface details core_file
(warns, lb) <- case linkableType of
BCOLinkable -> generateByteCode (CoreFileTime t) session ms cgi_guts
ObjectLinkable -> generateObjectCode session ms cgi_guts
pure (warns, HomeModInfo iface details . Just <$> lb)
-- | Non-interactive, batch version of 'InteractiveEval.getDocs'.
-- The interactive paths create problems in ghc-lib builds
--- and leads to fun errors like "Cannot continue after interface file error".
getDocsBatch
:: HscEnv
-> Module -- ^ a moudle where the names are in scope
-> [Name]
#if MIN_VERSION_ghc(9,3,0)
-> IO [Either String (Maybe [HsDoc GhcRn], IntMap (HsDoc GhcRn))]
#else
-> IO [Either String (Maybe HsDocString, IntMap HsDocString)]
#endif
getDocsBatch hsc_env _mod _names = do
(msgs, res) <- initTc hsc_env HsSrcFile False _mod fakeSpan $ forM _names $ \name ->
case nameModule_maybe name of
Nothing -> return (Left $ NameHasNoModule name)
Just mod -> do
ModIface {
#if MIN_VERSION_ghc(9,3,0)
mi_docs = Just Docs{ docs_mod_hdr = mb_doc_hdr
, docs_decls = dmap
, docs_args = amap
}
#else
mi_doc_hdr = mb_doc_hdr
, mi_decl_docs = DeclDocMap dmap
, mi_arg_docs = ArgDocMap amap
#endif
} <- loadModuleInterface "getModuleInterface" mod
#if MIN_VERSION_ghc(9,3,0)
if isNothing mb_doc_hdr && isNullUniqMap dmap && isNullUniqMap amap
#else
if isNothing mb_doc_hdr && Map.null dmap && null amap
#endif
then pure (Left (NoDocsInIface mod $ compiled name))
else pure (Right (
#if MIN_VERSION_ghc(9,3,0)
lookupUniqMap dmap name,
#else
Map.lookup name dmap ,
#endif
#if !MIN_VERSION_ghc(9,2,0)
IntMap.fromAscList $ Map.toAscList $
#endif
#if MIN_VERSION_ghc(9,3,0)
lookupWithDefaultUniqMap amap mempty name))
#else
Map.findWithDefault mempty name amap))
#endif
case res of
Just x -> return $ map (first $ T.unpack . printOutputable)
$ x
Nothing -> throwErrors
#if MIN_VERSION_ghc(9,3,0)
$ fmap GhcTcRnMessage msgs
#elif MIN_VERSION_ghc(9,2,0)
$ Error.getErrorMessages msgs
#else
$ snd msgs
#endif
where
throwErrors = liftIO . throwIO . mkSrcErr
compiled n =
-- TODO: Find a more direct indicator.
case nameSrcLoc n of
RealSrcLoc {} -> False
UnhelpfulLoc {} -> True
fakeSpan :: RealSrcSpan
fakeSpan = realSrcLocSpan $ mkRealSrcLoc (Util.fsLit "<ghcide>") 1 1
-- | Non-interactive, batch version of 'InteractiveEval.lookupNames'.
-- The interactive paths create problems in ghc-lib builds
--- and leads to fun errors like "Cannot continue after interface file error".
lookupName :: HscEnv
-> Module -- ^ A module where the Names are in scope
-> Name
-> IO (Maybe TyThing)
lookupName hsc_env mod name = do
(_messages, res) <- initTc hsc_env HsSrcFile False mod fakeSpan $ do
tcthing <- tcLookup name
case tcthing of
AGlobal thing -> return thing
ATcId{tct_id=id} -> return (AnId id)
_ -> panic "tcRnLookupName'"
return res
pathToModuleName :: FilePath -> ModuleName
pathToModuleName = mkModuleName . map rep
where
rep c | isPathSeparator c = '_'
rep ':' = '_'
rep c = c