2 % (c) The University of Glasgow, 2006
4 \section[HscTypes]{Types for the per-module compiler}
7 -- | Types for the per-module compiler
10 Ghc(..), GhcT(..), liftGhcT,
11 GhcMonad(..), WarnLogMonad(..),
14 logWarnings, clearWarnings, hasWarnings,
15 SourceError, GhcApiError, mkSrcErr, srcErrorMessages, mkApiErr,
16 throwOneError, handleSourceError,
20 -- * Sessions and compilation state
21 Session(..), withSession, modifySession, withTempSession,
23 FinderCache, FindResult(..), ModLocationCache,
24 Target(..), TargetId(..), pprTarget, pprTargetId,
27 GhcApiCallbacks(..), withLocalCallbacks,
29 -- * Information about modules
30 ModDetails(..), emptyModDetails,
31 ModGuts(..), CoreModule(..), CgGuts(..), ForeignStubs(..),
34 ModSummary(..), ms_mod_name, showModMsg, isBootSummary,
35 msHsFilePath, msHiFilePath, msObjFilePath,
37 -- * Information about the module being compiled
38 HscSource(..), isHsBoot, hscSourceString, -- Re-exported from DriverPhases
40 -- * State relating to modules in this package
41 HomePackageTable, HomeModInfo(..), emptyHomePackageTable,
42 hptInstances, hptRules, hptVectInfo,
44 -- * State relating to known packages
45 ExternalPackageState(..), EpsStats(..), addEpsInStats,
46 PackageTypeEnv, PackageIfaceTable, emptyPackageIfaceTable,
47 lookupIfaceByModule, emptyModIface,
49 PackageInstEnv, PackageRuleBase,
55 -- * Interactive context
56 InteractiveContext(..), emptyInteractiveContext,
57 icPrintUnqual, extendInteractiveContext,
58 substInteractiveContext,
59 mkPrintUnqualified, pprModulePrefix,
62 ModIface(..), mkIfaceWarnCache, mkIfaceHashCache, mkIfaceFixCache,
66 FixityEnv, FixItem(..), lookupFixity, emptyFixityEnv,
68 -- * TyThings and type environments
70 tyThingClass, tyThingTyCon, tyThingDataCon, tyThingId,
71 implicitTyThings, isImplicitTyThing,
73 TypeEnv, lookupType, lookupTypeHscEnv, mkTypeEnv, emptyTypeEnv,
74 extendTypeEnv, extendTypeEnvList, extendTypeEnvWithIds, lookupTypeEnv,
75 typeEnvElts, typeEnvClasses, typeEnvTyCons, typeEnvIds,
81 -- * Information on imports and exports
82 WhetherHasOrphans, IsBootInterface, Usage(..),
83 Dependencies(..), noDependencies,
84 NameCache(..), OrigNameCache, OrigIParamCache,
85 Avails, availsToNameSet, availsToNameEnv, availName, availNames,
86 GenAvailInfo(..), AvailInfo, RdrAvailInfo,
90 Warnings(..), WarningTxt(..), plusWarns,
93 Linkable(..), isObjectLinkable,
94 Unlinked(..), CompiledByteCode,
95 isObject, nameOfObject, isInterpretable, byteCodeOfObject,
98 HpcInfo(..), emptyHpcInfo, isHpcUsed, AnyHpcUsage,
101 ModBreaks (..), BreakIndex, emptyModBreaks,
103 -- * Vectorisation information
104 VectInfo(..), IfaceVectInfo(..), noVectInfo, plusVectInfo,
108 #include "HsVersions.h"
111 import ByteCodeAsm ( CompiledByteCode )
112 import {-# SOURCE #-} InteractiveEval ( Resume )
121 import InstEnv ( InstEnv, Instance )
122 import FamInstEnv ( FamInstEnv, FamInst )
123 import Rules ( RuleBase )
124 import CoreSyn ( CoreBind )
132 import Class ( Class, classSelIds, classATs, classTyCon )
134 import DataCon ( DataCon, dataConImplicitIds, dataConWrapId )
135 import PrelNames ( gHC_PRIM )
136 import Packages hiding ( Version(..) )
137 import DynFlags ( DynFlags(..), isOneShot, HscTarget (..), dopt,
139 import DriverPhases ( HscSource(..), isHsBoot, hscSourceString, Phase )
140 import BasicTypes ( IPName, defaultFixity, WarningTxt(..) )
141 import OptimizationFuel ( OptFuelState )
143 import FiniteMap ( FiniteMap )
144 import CoreSyn ( CoreRule )
145 import Maybes ( orElse, expectJust, catMaybes )
148 import SrcLoc ( SrcSpan, Located(..) )
149 import LazyUniqFM ( lookupUFM, eltsUFM, emptyUFM )
150 import UniqSupply ( UniqSupply )
152 import StringBuffer ( StringBuffer )
155 import Data.Dynamic ( Typeable )
156 import qualified Data.Dynamic as Dyn
160 import System.FilePath
161 import System.Time ( ClockTime )
163 import Data.Array ( Array, array )
165 import Control.Monad ( mplus, guard, liftM, when )
167 import Control.Concurrent.MVar ( MVar )
171 %************************************************************************
173 \subsection{Compilation environment}
175 %************************************************************************
179 -- | The Session is a handle to the complete state of a compilation
180 -- session. A compilation session consists of a set of modules
181 -- constituting the current program or library, the context for
182 -- interactive evaluation, and various caches.
183 data Session = Session !(IORef HscEnv) !(IORef WarningMessages)
185 mkSrcErr :: ErrorMessages -> SourceError
186 srcErrorMessages :: SourceError -> ErrorMessages
187 mkApiErr :: SDoc -> GhcApiError
189 throwOneError :: MonadIO m => ErrMsg -> m ab
190 throwOneError err = liftIO $ throwIO $ mkSrcErr $ unitBag err
192 -- | A source error is an error that is caused by one or more errors in the
193 -- source code. A 'SourceError' is thrown by many functions in the
194 -- compilation pipeline. Inside GHC these errors are merely printed via
195 -- 'log_action', but API clients may treat them differently, for example,
196 -- insert them into a list box. If you want the default behaviour, use the
199 -- > handleSourceError printExceptionAndWarnings $ do
200 -- > ... api calls that may fail ...
202 -- The 'SourceError's error messages can be accessed via 'srcErrorMessages'.
203 -- This list may be empty if the compiler failed due to @-Werror@
204 -- ('Opt_WarnIsError').
206 -- See 'printExceptionAndWarnings' for more information on what to take care
207 -- of when writing a custom error handler.
208 data SourceError = SourceError ErrorMessages
210 instance Show SourceError where
211 show (SourceError msgs) = unlines . map show . bagToList $ msgs
212 -- ToDo: is there some nicer way to print this?
214 sourceErrorTc :: Dyn.TyCon
215 sourceErrorTc = Dyn.mkTyCon "SourceError"
216 {-# NOINLINE sourceErrorTc #-}
217 instance Typeable SourceError where
218 typeOf _ = Dyn.mkTyConApp sourceErrorTc []
220 instance Exception SourceError
222 mkSrcErr = SourceError
224 -- | Perform the given action and call the exception handler if the action
225 -- throws a 'SourceError'. See 'SourceError' for more information.
226 handleSourceError :: (ExceptionMonad m) =>
227 (SourceError -> m a) -- ^ exception handler
228 -> m a -- ^ action to perform
230 handleSourceError handler act =
231 gcatch act (\(e :: SourceError) -> handler e)
233 srcErrorMessages (SourceError msgs) = msgs
235 -- | XXX: what exactly is an API error?
236 data GhcApiError = GhcApiError SDoc
238 instance Show GhcApiError where
239 show (GhcApiError msg) = showSDoc msg
241 ghcApiErrorTc :: Dyn.TyCon
242 ghcApiErrorTc = Dyn.mkTyCon "GhcApiError"
243 {-# NOINLINE ghcApiErrorTc #-}
244 instance Typeable GhcApiError where
245 typeOf _ = Dyn.mkTyConApp ghcApiErrorTc []
247 instance Exception GhcApiError
249 mkApiErr = GhcApiError
251 -- | A monad that allows logging of warnings.
252 class Monad m => WarnLogMonad m where
253 setWarnings :: WarningMessages -> m ()
254 getWarnings :: m WarningMessages
256 logWarnings :: WarnLogMonad m => WarningMessages -> m ()
257 logWarnings warns = do
258 warns0 <- getWarnings
259 setWarnings (unionBags warns warns0)
261 -- | Clear the log of 'Warnings'.
262 clearWarnings :: WarnLogMonad m => m ()
263 clearWarnings = setWarnings emptyBag
265 -- | Returns true if there were any warnings.
266 hasWarnings :: WarnLogMonad m => m Bool
267 hasWarnings = getWarnings >>= return . not . isEmptyBag
269 -- | A monad that has all the features needed by GHC API calls.
271 -- In short, a GHC monad
273 -- - allows embedding of IO actions,
275 -- - can log warnings,
277 -- - allows handling of (extensible) exceptions, and
279 -- - maintains a current session.
281 -- If you do not use 'Ghc' or 'GhcT', make sure to call 'GHC.initGhcMonad'
282 -- before any call to the GHC API functions can occur.
284 class (Functor m, MonadIO m, WarnLogMonad m, ExceptionMonad m)
286 getSession :: m HscEnv
287 setSession :: HscEnv -> m ()
289 -- | Call the argument with the current session.
290 withSession :: GhcMonad m => (HscEnv -> m a) -> m a
291 withSession f = getSession >>= f
293 -- | Set the current session to the result of applying the current session to
295 modifySession :: GhcMonad m => (HscEnv -> HscEnv) -> m ()
296 modifySession f = do h <- getSession
299 withSavedSession :: GhcMonad m => m a -> m a
300 withSavedSession m = do
301 saved_session <- getSession
302 m `gfinally` setSession saved_session
304 -- | Call an action with a temporarily modified Session.
305 withTempSession :: GhcMonad m => (HscEnv -> HscEnv) -> m a -> m a
306 withTempSession f m =
307 withSavedSession $ modifySession f >> m
309 -- | A minimal implementation of a 'GhcMonad'. If you need a custom monad,
310 -- e.g., to maintain additional state consider wrapping this monad or using
312 newtype Ghc a = Ghc { unGhc :: Session -> IO a }
314 instance Functor Ghc where
315 fmap f m = Ghc $ \s -> f `fmap` unGhc m s
317 instance Monad Ghc where
318 return a = Ghc $ \_ -> return a
319 m >>= g = Ghc $ \s -> do a <- unGhc m s; unGhc (g a) s
321 instance MonadIO Ghc where
322 liftIO ioA = Ghc $ \_ -> ioA
324 instance ExceptionMonad Ghc where
326 Ghc $ \s -> unGhc act s `gcatch` \e -> unGhc (handle e) s
327 gblock (Ghc m) = Ghc $ \s -> gblock (m s)
328 gunblock (Ghc m) = Ghc $ \s -> gunblock (m s)
330 instance WarnLogMonad Ghc where
331 setWarnings warns = Ghc $ \(Session _ wref) -> writeIORef wref warns
332 -- | Return 'Warnings' accumulated so far.
333 getWarnings = Ghc $ \(Session _ wref) -> readIORef wref
335 instance GhcMonad Ghc where
336 getSession = Ghc $ \(Session r _) -> readIORef r
337 setSession s' = Ghc $ \(Session r _) -> writeIORef r s'
339 -- | A monad transformer to add GHC specific features to another monad.
341 -- Note that the wrapped monad must support IO and handling of exceptions.
342 newtype GhcT m a = GhcT { unGhcT :: Session -> m a }
343 liftGhcT :: Monad m => m a -> GhcT m a
344 liftGhcT m = GhcT $ \_ -> m
346 instance Functor m => Functor (GhcT m) where
347 fmap f m = GhcT $ \s -> f `fmap` unGhcT m s
349 instance Monad m => Monad (GhcT m) where
350 return x = GhcT $ \_ -> return x
351 m >>= k = GhcT $ \s -> do a <- unGhcT m s; unGhcT (k a) s
353 instance MonadIO m => MonadIO (GhcT m) where
354 liftIO ioA = GhcT $ \_ -> liftIO ioA
356 instance ExceptionMonad m => ExceptionMonad (GhcT m) where
358 GhcT $ \s -> unGhcT act s `gcatch` \e -> unGhcT (handle e) s
359 gblock (GhcT m) = GhcT $ \s -> gblock (m s)
360 gunblock (GhcT m) = GhcT $ \s -> gunblock (m s)
362 instance MonadIO m => WarnLogMonad (GhcT m) where
363 setWarnings warns = GhcT $ \(Session _ wref) -> liftIO $ writeIORef wref warns
364 -- | Return 'Warnings' accumulated so far.
365 getWarnings = GhcT $ \(Session _ wref) -> liftIO $ readIORef wref
367 instance (Functor m, ExceptionMonad m, MonadIO m) => GhcMonad (GhcT m) where
368 getSession = GhcT $ \(Session r _) -> liftIO $ readIORef r
369 setSession s' = GhcT $ \(Session r _) -> liftIO $ writeIORef r s'
371 -- | Lift an IO action returning errors messages into a 'GhcMonad'.
373 -- In order to reduce dependencies to other parts of the compiler, functions
374 -- outside the "main" parts of GHC return warnings and errors as a parameter
375 -- and signal success via by wrapping the result in a 'Maybe' type. This
376 -- function logs the returned warnings and propagates errors as exceptions
377 -- (of type 'SourceError').
379 -- This function assumes the following invariants:
381 -- 1. If the second result indicates success (is of the form 'Just x'),
382 -- there must be no error messages in the first result.
384 -- 2. If there are no error messages, but the second result indicates failure
385 -- there should be warnings in the first result. That is, if the action
386 -- failed, it must have been due to the warnings (i.e., @-Werror@).
387 ioMsgMaybe :: GhcMonad m =>
388 IO (Messages, Maybe a) -> m a
390 ((warns,errs), mb_r) <- liftIO ioA
393 Nothing -> liftIO $ throwIO (mkSrcErr errs)
394 Just r -> ASSERT( isEmptyBag errs ) return r
396 -- | Lift a non-failing IO action into a 'GhcMonad'.
398 -- Like 'ioMsgMaybe', but assumes that the action will never return any error
400 ioMsg :: GhcMonad m => IO (Messages, a) -> m a
402 ((warns,errs), r) <- liftIO ioA
404 ASSERT( isEmptyBag errs ) return r
406 -- | Reflect a computation in the 'Ghc' monad into the 'IO' monad.
408 -- You can use this to call functions returning an action in the 'Ghc' monad
409 -- inside an 'IO' action. This is needed for some (too restrictive) callback
410 -- arguments of some library functions:
412 -- > libFunc :: String -> (Int -> IO a) -> IO a
413 -- > ghcFunc :: Int -> Ghc a
415 -- > ghcFuncUsingLibFunc :: String -> Ghc a -> Ghc a
416 -- > ghcFuncUsingLibFunc str =
417 -- > reifyGhc $ \s ->
418 -- > libFunc $ \i -> do
419 -- > reflectGhc (ghcFunc i) s
421 reflectGhc :: Ghc a -> Session -> IO a
422 reflectGhc m = unGhc m
424 -- > Dual to 'reflectGhc'. See its documentation.
425 reifyGhc :: (Session -> IO a) -> Ghc a
426 reifyGhc act = Ghc $ act
428 handleFlagWarnings :: GhcMonad m => DynFlags -> [Located String] -> m ()
429 handleFlagWarnings dflags warns
430 = when (dopt Opt_WarnDeprecatedFlags dflags)
431 (handleFlagWarnings' dflags warns)
433 handleFlagWarnings' :: GhcMonad m => DynFlags -> [Located String] -> m ()
434 handleFlagWarnings' _ [] = return ()
435 handleFlagWarnings' dflags warns
436 = do -- It would be nicer if warns :: [Located Message], but that has circular
438 logWarnings $ listToBag (map mkFlagWarning warns)
439 when (dopt Opt_WarnIsError dflags) $
440 liftIO $ throwIO $ mkSrcErr emptyBag
442 mkFlagWarning :: Located String -> WarnMsg
443 mkFlagWarning (L loc warn)
444 = mkPlainWarnMsg loc (text warn)
448 -- | These functions are called in various places of the GHC API.
450 -- API clients can override any of these callbacks to change GHC's default
455 -- | Called by 'load' after the compilating of each module.
457 -- The default implementation simply prints all warnings and errors to
458 -- @stderr@. Don't forget to call 'clearWarnings' when implementing your
461 -- The first argument is the module that was compiled.
463 -- The second argument is @Nothing@ if no errors occured, but there may
464 -- have been warnings. If it is @Just err@ at least one error has
465 -- occured. If 'srcErrorMessages' is empty, compilation failed due to
467 reportModuleCompilationResult :: GhcMonad m =>
468 ModSummary -> Maybe SourceError
472 -- | Temporarily modify the callbacks. After the action is executed all
473 -- callbacks are reset (not, however, any other modifications to the session
475 withLocalCallbacks :: GhcMonad m =>
476 (GhcApiCallbacks -> GhcApiCallbacks)
478 withLocalCallbacks f m = do
479 hsc_env <- getSession
480 let cb0 = hsc_callbacks hsc_env
482 setSession (hsc_env { hsc_callbacks = cb' `seq` cb' })
484 hsc_env' <- getSession
485 setSession (hsc_env' { hsc_callbacks = cb0 })
491 -- | Hscenv is like 'Session', except that some of the fields are immutable.
492 -- An HscEnv is used to compile a single module from plain Haskell source
493 -- code (after preprocessing) to either C, assembly or C--. Things like
494 -- the module graph don't change during a single compilation.
496 -- Historical note: \"hsc\" used to be the name of the compiler binary,
497 -- when there was a separate driver and compiler. To compile a single
498 -- module, the driver would invoke hsc on the source code... so nowadays
499 -- we think of hsc as the layer of the compiler that deals with compiling
503 hsc_dflags :: DynFlags,
504 -- ^ The dynamic flag settings
506 hsc_callbacks :: GhcApiCallbacks,
507 -- ^ Callbacks for the GHC API.
509 hsc_targets :: [Target],
510 -- ^ The targets (or roots) of the current session
512 hsc_mod_graph :: ModuleGraph,
513 -- ^ The module graph of the current session
515 hsc_IC :: InteractiveContext,
516 -- ^ The context for evaluating interactive statements
518 hsc_HPT :: HomePackageTable,
519 -- ^ The home package table describes already-compiled
520 -- home-package modules, /excluding/ the module we
521 -- are compiling right now.
522 -- (In one-shot mode the current module is the only
523 -- home-package module, so hsc_HPT is empty. All other
524 -- modules count as \"external-package\" modules.
525 -- However, even in GHCi mode, hi-boot interfaces are
526 -- demand-loaded into the external-package table.)
528 -- 'hsc_HPT' is not mutable because we only demand-load
529 -- external packages; the home package is eagerly
530 -- loaded, module by module, by the compilation manager.
532 -- The HPT may contain modules compiled earlier by @--make@
533 -- but not actually below the current module in the dependency
536 -- (This changes a previous invariant: changed Jan 05.)
538 hsc_EPS :: {-# UNPACK #-} !(IORef ExternalPackageState),
539 -- ^ Information about the currently loaded external packages.
540 -- This is mutable because packages will be demand-loaded during
541 -- a compilation run as required.
543 hsc_NC :: {-# UNPACK #-} !(IORef NameCache),
544 -- ^ As with 'hsc_EPS', this is side-effected by compiling to
545 -- reflect sucking in interface files. They cache the state of
546 -- external interface files, in effect.
548 hsc_NC_lock :: !(MVar ()),
549 -- ^ A lock used for updating the name cache.
551 hsc_FC :: {-# UNPACK #-} !(IORef FinderCache),
552 -- ^ The cached result of performing finding in the file system
553 hsc_MLC :: {-# UNPACK #-} !(IORef ModLocationCache),
554 -- ^ This caches the location of modules, so we don't have to
555 -- search the filesystem multiple times. See also 'hsc_FC'.
557 hsc_OptFuel :: OptFuelState,
558 -- ^ Settings to control the use of \"optimization fuel\":
559 -- by limiting the number of transformations,
560 -- we can use binary search to help find compiler bugs.
562 hsc_type_env_var :: Maybe (Module, IORef TypeEnv),
563 -- ^ Used for one-shot compilation only, to initialise
564 -- the 'IfGblEnv'. See 'TcRnTypes.tcg_type_env_var' for
565 -- 'TcRunTypes.TcGblEnv'
567 hsc_global_rdr_env :: GlobalRdrEnv,
568 -- ^ A mapping from 'RdrName's that are in global scope during
569 -- the compilation of the current file to more detailed
570 -- information about those names. Not necessarily just the
571 -- names directly imported by the module being compiled!
573 hsc_global_type_env :: TypeEnv
574 -- ^ Typing information about all those things in global scope.
575 -- Not necessarily just the things directly imported by the module
579 hscEPS :: HscEnv -> IO ExternalPackageState
580 hscEPS hsc_env = readIORef (hsc_EPS hsc_env)
582 -- | A compilation target.
584 -- A target may be supplied with the actual text of the
585 -- module. If so, use this instead of the file contents (this
586 -- is for use in an IDE where the file hasn't been saved by
589 { targetId :: TargetId -- ^ module or filename
590 , targetAllowObjCode :: Bool -- ^ object code allowed?
591 , targetContents :: Maybe (StringBuffer,ClockTime)
592 -- ^ in-memory text buffer?
596 = TargetModule ModuleName
597 -- ^ A module name: search for the file
598 | TargetFile FilePath (Maybe Phase)
599 -- ^ A filename: preprocess & parse it to find the module name.
600 -- If specified, the Phase indicates how to compile this file
601 -- (which phase to start from). Nothing indicates the starting phase
602 -- should be determined from the suffix of the filename.
605 pprTarget :: Target -> SDoc
606 pprTarget (Target id obj _) =
607 (if obj then char '*' else empty) <> pprTargetId id
609 instance Outputable Target where
612 pprTargetId :: TargetId -> SDoc
613 pprTargetId (TargetModule m) = ppr m
614 pprTargetId (TargetFile f _) = text f
616 instance Outputable TargetId where
619 -- | Helps us find information about modules in the home package
620 type HomePackageTable = ModuleNameEnv HomeModInfo
621 -- Domain = modules in the home package that have been fully compiled
622 -- "home" package name cached here for convenience
624 -- | Helps us find information about modules in the imported packages
625 type PackageIfaceTable = ModuleEnv ModIface
626 -- Domain = modules in the imported packages
628 emptyHomePackageTable :: HomePackageTable
629 emptyHomePackageTable = emptyUFM
631 emptyPackageIfaceTable :: PackageIfaceTable
632 emptyPackageIfaceTable = emptyModuleEnv
634 -- | Information about modules in the package being compiled
637 hm_iface :: !ModIface,
638 -- ^ The basic loaded interface file: every loaded module has one of
639 -- these, even if it is imported from another package
640 hm_details :: !ModDetails,
641 -- ^ Extra information that has been created from the 'ModIface' for
642 -- the module, typically during typechecking
643 hm_linkable :: !(Maybe Linkable)
644 -- ^ The actual artifact we would like to link to access things in
647 -- 'hm_linkable' might be Nothing:
649 -- 1. If this is an .hs-boot module
651 -- 2. Temporarily during compilation if we pruned away
652 -- the old linkable because it was out of date.
654 -- After a complete compilation ('GHC.load'), all 'hm_linkable' fields
655 -- in the 'HomePackageTable' will be @Just@.
657 -- When re-linking a module ('HscMain.HscNoRecomp'), we construct the
658 -- 'HomeModInfo' by building a new 'ModDetails' from the old
659 -- 'ModIface' (only).
662 -- | Find the 'ModIface' for a 'Module', searching in both the loaded home
663 -- and external package module information
670 lookupIfaceByModule dflags hpt pit mod
671 | modulePackageId mod == thisPackage dflags
672 = -- The module comes from the home package, so look first
673 -- in the HPT. If it's not from the home package it's wrong to look
674 -- in the HPT, because the HPT is indexed by *ModuleName* not Module
675 fmap hm_iface (lookupUFM hpt (moduleName mod))
676 `mplus` lookupModuleEnv pit mod
678 | otherwise = lookupModuleEnv pit mod -- Look in PIT only
680 -- If the module does come from the home package, why do we look in the PIT as well?
681 -- (a) In OneShot mode, even home-package modules accumulate in the PIT
682 -- (b) Even in Batch (--make) mode, there is *one* case where a home-package
683 -- module is in the PIT, namely GHC.Prim when compiling the base package.
684 -- We could eliminate (b) if we wanted, by making GHC.Prim belong to a package
685 -- of its own, but it doesn't seem worth the bother.
690 hptInstances :: HscEnv -> (ModuleName -> Bool) -> ([Instance], [FamInst])
691 -- ^ Find all the instance declarations (of classes and families) that are in
692 -- modules imported by this one, directly or indirectly, and are in the Home
693 -- Package Table. This ensures that we don't see instances from modules @--make@
694 -- compiled before this one, but which are not below this one.
695 hptInstances hsc_env want_this_module
696 = let (insts, famInsts) = unzip $ flip hptAllThings hsc_env $ \mod_info -> do
697 guard (want_this_module (moduleName (mi_module (hm_iface mod_info))))
698 let details = hm_details mod_info
699 return (md_insts details, md_fam_insts details)
700 in (concat insts, concat famInsts)
702 hptVectInfo :: HscEnv -> VectInfo
703 -- ^ Get the combined VectInfo of all modules in the home package table. In
704 -- contrast to instances and rules, we don't care whether the modules are
705 -- \"below\" us in the dependency sense. The VectInfo of those modules not \"below\"
706 -- us does not affect the compilation of the current module.
707 hptVectInfo = concatVectInfo . hptAllThings ((: []) . md_vect_info . hm_details)
709 hptRules :: HscEnv -> [(ModuleName, IsBootInterface)] -> [CoreRule]
710 -- ^ Get rules from modules \"below\" this one (in the dependency sense)
711 hptRules = hptSomeThingsBelowUs (md_rules . hm_details) False
714 hptAnns :: HscEnv -> Maybe [(ModuleName, IsBootInterface)] -> [Annotation]
715 -- ^ Get annotations from modules \"below\" this one (in the dependency sense)
716 hptAnns hsc_env (Just deps) = hptSomeThingsBelowUs (md_anns . hm_details) False hsc_env deps
717 hptAnns hsc_env Nothing = hptAllThings (md_anns . hm_details) hsc_env
719 hptAllThings :: (HomeModInfo -> [a]) -> HscEnv -> [a]
720 hptAllThings extract hsc_env = concatMap extract (eltsUFM (hsc_HPT hsc_env))
722 hptSomeThingsBelowUs :: (HomeModInfo -> [a]) -> Bool -> HscEnv -> [(ModuleName, IsBootInterface)] -> [a]
723 -- Get things from modules \"below\" this one (in the dependency sense)
724 -- C.f Inst.hptInstances
725 hptSomeThingsBelowUs extract include_hi_boot hsc_env deps
726 | isOneShot (ghcMode (hsc_dflags hsc_env)) = []
729 hpt = hsc_HPT hsc_env
732 | -- Find each non-hi-boot module below me
733 (mod, is_boot_mod) <- deps
734 , include_hi_boot || not is_boot_mod
736 -- unsavoury: when compiling the base package with --make, we
737 -- sometimes try to look up RULES etc for GHC.Prim. GHC.Prim won't
738 -- be in the HPT, because we never compile it; it's in the EPT
739 -- instead. ToDo: clean up, and remove this slightly bogus
741 , mod /= moduleName gHC_PRIM
743 -- Look it up in the HPT
744 , let things = case lookupUFM hpt mod of
745 Just info -> extract info
746 Nothing -> pprTrace "WARNING in hptSomeThingsBelowUs" msg []
747 msg = vcat [ptext (sLit "missing module") <+> ppr mod,
748 ptext (sLit "Probable cause: out-of-date interface files")]
749 -- This really shouldn't happen, but see Trac #962
755 %************************************************************************
757 \subsection{Dealing with Annotations}
759 %************************************************************************
762 prepareAnnotations :: HscEnv -> Maybe ModGuts -> IO AnnEnv
763 -- ^ Deal with gathering annotations in from all possible places
764 -- and combining them into a single 'AnnEnv'
765 prepareAnnotations hsc_env mb_guts
766 = do { eps <- hscEPS hsc_env
767 ; let -- Extract annotations from the module being compiled if supplied one
768 mb_this_module_anns = fmap (mkAnnEnv . mg_anns) mb_guts
769 -- Extract dependencies of the module if we are supplied one,
770 -- otherwise load annotations from all home package table
771 -- entries regardless of dependency ordering.
772 home_pkg_anns = (mkAnnEnv . hptAnns hsc_env) $ fmap (dep_mods . mg_deps) mb_guts
773 other_pkg_anns = eps_ann_env eps
774 ann_env = foldl1' plusAnnEnv $ catMaybes [mb_this_module_anns,
781 %************************************************************************
783 \subsection{The Finder cache}
785 %************************************************************************
788 -- | The 'FinderCache' maps home module names to the result of
789 -- searching for that module. It records the results of searching for
790 -- modules along the search path. On @:load@, we flush the entire
791 -- contents of this cache.
793 -- Although the @FinderCache@ range is 'FindResult' for convenience ,
794 -- in fact it will only ever contain 'Found' or 'NotFound' entries.
796 type FinderCache = ModuleNameEnv FindResult
798 -- | The result of searching for an imported module.
800 = Found ModLocation Module
801 -- ^ The module was found
802 | NoPackage PackageId
803 -- ^ The requested package was not found
804 | FoundMultiple [PackageId]
805 -- ^ _Error_: both in multiple packages
806 | NotFound [FilePath] (Maybe PackageId) [PackageId] [PackageId]
807 -- ^ The module was not found, including either
808 -- * the specified places were searched
809 -- * the package that this module should have been in
810 -- * list of packages in which the module was hidden,
811 -- * list of hidden packages containing this module
812 | NotFoundInPackage PackageId
813 -- ^ The module was not found in this package
815 -- | Cache that remembers where we found a particular module. Contains both
816 -- home modules and package modules. On @:load@, only home modules are
817 -- purged from this cache.
818 type ModLocationCache = ModuleEnv ModLocation
821 %************************************************************************
823 \subsection{Symbol tables and Module details}
825 %************************************************************************
828 -- | A 'ModIface' plus a 'ModDetails' summarises everything we know
829 -- about a compiled module. The 'ModIface' is the stuff *before* linking,
830 -- and can be written out to an interface file. The 'ModDetails is after
831 -- linking and can be completely recovered from just the 'ModIface'.
833 -- When we read an interface file, we also construct a 'ModIface' from it,
834 -- except that we explicitly make the 'mi_decls' and a few other fields empty;
835 -- as when reading we consolidate the declarations etc. into a number of indexed
836 -- maps and environments in the 'ExternalPackageState'.
839 mi_module :: !Module, -- ^ Name of the module we are for
840 mi_iface_hash :: !Fingerprint, -- ^ Hash of the whole interface
841 mi_mod_hash :: !Fingerprint, -- ^ Hash of the ABI only
843 mi_orphan :: !WhetherHasOrphans, -- ^ Whether this module has orphans
844 mi_finsts :: !WhetherHasFamInst, -- ^ Whether this module has family instances
845 mi_boot :: !IsBootInterface, -- ^ Read from an hi-boot file?
847 mi_deps :: Dependencies,
848 -- ^ The dependencies of the module. This is
849 -- consulted for directly-imported modules, but not
850 -- for anything else (hence lazy)
852 mi_usages :: [Usage],
853 -- ^ Usages; kept sorted so that it's easy to decide
854 -- whether to write a new iface file (changing usages
855 -- doesn't affect the hash of this module)
857 -- NOT STRICT! we read this field lazily from the interface file
858 -- It is *only* consulted by the recompilation checker
861 -- Kept sorted by (mod,occ), to make version comparisons easier
862 mi_exports :: ![IfaceExport],
863 -- ^ Records the modules that are the declaration points for things
864 -- exported by this module, and the 'OccName's of those things
866 mi_exp_hash :: !Fingerprint, -- ^ Hash of export list
868 mi_fixities :: [(OccName,Fixity)],
871 -- NOT STRICT! we read this field lazily from the interface file
873 mi_warns :: Warnings,
876 -- NOT STRICT! we read this field lazily from the interface file
878 mi_anns :: [IfaceAnnotation],
881 -- NOT STRICT! we read this field lazily from the interface file
883 -- Type, class and variable declarations
884 -- The hash of an Id changes if its fixity or deprecations change
885 -- (as well as its type of course)
886 -- Ditto data constructors, class operations, except that
887 -- the hash of the parent class/tycon changes
888 mi_decls :: [(Fingerprint,IfaceDecl)], -- ^ Sorted type, variable, class etc. declarations
890 mi_globals :: !(Maybe GlobalRdrEnv),
891 -- ^ Binds all the things defined at the top level in
892 -- the /original source/ code for this module. which
893 -- is NOT the same as mi_exports, nor mi_decls (which
894 -- may contains declarations for things not actually
895 -- defined by the user). Used for GHCi and for inspecting
896 -- the contents of modules via the GHC API only.
898 -- (We need the source file to figure out the
899 -- top-level environment, if we didn't compile this module
900 -- from source then this field contains @Nothing@).
902 -- Strictly speaking this field should live in the
903 -- 'HomeModInfo', but that leads to more plumbing.
905 -- Instance declarations and rules
906 mi_insts :: [IfaceInst], -- ^ Sorted class instance
907 mi_fam_insts :: [IfaceFamInst], -- ^ Sorted family instances
908 mi_rules :: [IfaceRule], -- ^ Sorted rules
909 mi_orphan_hash :: !Fingerprint, -- ^ Hash for orphan rules and
910 -- class and family instances
913 mi_vect_info :: !IfaceVectInfo, -- ^ Vectorisation information
915 -- Cached environments for easy lookup
916 -- These are computed (lazily) from other fields
917 -- and are not put into the interface file
918 mi_warn_fn :: Name -> Maybe WarningTxt, -- ^ Cached lookup for 'mi_warns'
919 mi_fix_fn :: OccName -> Fixity, -- ^ Cached lookup for 'mi_fixities'
920 mi_hash_fn :: OccName -> Maybe (OccName, Fingerprint),
921 -- ^ Cached lookup for 'mi_decls'.
922 -- The @Nothing@ in 'mi_hash_fn' means that the thing
923 -- isn't in decls. It's useful to know that when
924 -- seeing if we are up to date wrt. the old interface.
925 -- The 'OccName' is the parent of the name, if it has one.
926 mi_hpc :: !AnyHpcUsage
927 -- ^ True if this program uses Hpc at any point in the program.
930 -- | The 'ModDetails' is essentially a cache for information in the 'ModIface'
931 -- for home modules only. Information relating to packages will be loaded into
932 -- global environments in 'ExternalPackageState'.
935 -- The next two fields are created by the typechecker
936 md_exports :: [AvailInfo],
937 md_types :: !TypeEnv, -- ^ Local type environment for this particular module
938 md_insts :: ![Instance], -- ^ 'DFunId's for the instances in this module
939 md_fam_insts :: ![FamInst],
940 md_rules :: ![CoreRule], -- ^ Domain may include 'Id's from other modules
941 md_anns :: ![Annotation], -- ^ Annotations present in this module: currently
942 -- they only annotate things also declared in this module
943 md_vect_info :: !VectInfo -- ^ Module vectorisation information
946 emptyModDetails :: ModDetails
947 emptyModDetails = ModDetails { md_types = emptyTypeEnv,
953 md_vect_info = noVectInfo
956 -- | Records the modules directly imported by a module for extracting e.g. usage information
957 type ImportedMods = ModuleEnv [(ModuleName, Bool, SrcSpan)]
958 -- TODO: we are not actually using the codomain of this type at all, so it can be
959 -- replaced with ModuleEnv ()
961 -- | A ModGuts is carried through the compiler, accumulating stuff as it goes
962 -- There is only one ModGuts at any time, the one for the module
963 -- being compiled right now. Once it is compiled, a 'ModIface' and
964 -- 'ModDetails' are extracted and the ModGuts is dicarded.
967 mg_module :: !Module, -- ^ Module being compiled
968 mg_boot :: IsBootInterface, -- ^ Whether it's an hs-boot module
969 mg_exports :: ![AvailInfo], -- ^ What it exports
970 mg_deps :: !Dependencies, -- ^ What it depends on, directly or
972 mg_dir_imps :: !ImportedMods, -- ^ Directly-imported modules; used to
973 -- generate initialisation code
974 mg_used_names:: !NameSet, -- ^ What the module needed (used in 'MkIface.mkIface')
976 mg_rdr_env :: !GlobalRdrEnv, -- ^ Top-level lexical environment
978 -- These fields all describe the things **declared in this module**
979 mg_fix_env :: !FixityEnv, -- ^ Fixities declared in this module
980 -- TODO: I'm unconvinced this is actually used anywhere
981 mg_types :: !TypeEnv, -- ^ Types declared in this module
982 mg_insts :: ![Instance], -- ^ Class instances declared in this module
983 mg_fam_insts :: ![FamInst], -- ^ Family instances declared in this module
984 mg_rules :: ![CoreRule], -- ^ Before the core pipeline starts, contains
985 -- rules declared in this module. After the core
986 -- pipeline starts, it is changed to contain all
987 -- known rules for those things imported
988 mg_binds :: ![CoreBind], -- ^ Bindings for this module
989 mg_foreign :: !ForeignStubs, -- ^ Foreign exports declared in this module
990 mg_warns :: !Warnings, -- ^ Warnings declared in the module
991 mg_anns :: [Annotation], -- ^ Annotations declared in this module
992 mg_hpc_info :: !HpcInfo, -- ^ Coverage tick boxes in the module
993 mg_modBreaks :: !ModBreaks, -- ^ Breakpoints for the module
994 mg_vect_info :: !VectInfo, -- ^ Pool of vectorised declarations in the module
996 -- The next two fields are unusual, because they give instance
997 -- environments for *all* modules in the home package, including
998 -- this module, rather than for *just* this module.
999 -- Reason: when looking up an instance we don't want to have to
1000 -- look at each module in the home package in turn
1001 mg_inst_env :: InstEnv,
1002 -- ^ Class instance environment from /home-package/ modules (including
1003 -- this one); c.f. 'tcg_inst_env'
1004 mg_fam_inst_env :: FamInstEnv
1005 -- ^ Type-family instance enviroment for /home-package/ modules
1006 -- (including this one); c.f. 'tcg_fam_inst_env'
1009 -- The ModGuts takes on several slightly different forms:
1011 -- After simplification, the following fields change slightly:
1012 -- mg_rules Orphan rules only (local ones now attached to binds)
1013 -- mg_binds With rules attached
1015 -- | A CoreModule consists of just the fields of a 'ModGuts' that are needed for
1016 -- the 'GHC.compileToCoreModule' interface.
1020 cm_module :: !Module,
1021 -- | Type environment for types declared in this module
1022 cm_types :: !TypeEnv,
1024 cm_binds :: [CoreBind],
1026 cm_imports :: ![Module]
1029 instance Outputable CoreModule where
1030 ppr (CoreModule {cm_module = mn, cm_types = te, cm_binds = cb}) =
1031 text "%module" <+> ppr mn <+> ppr te $$ vcat (map ppr cb)
1033 -- The ModGuts takes on several slightly different forms:
1035 -- After simplification, the following fields change slightly:
1036 -- mg_rules Orphan rules only (local ones now attached to binds)
1037 -- mg_binds With rules attached
1040 ---------------------------------------------------------
1041 -- The Tidy pass forks the information about this module:
1042 -- * one lot goes to interface file generation (ModIface)
1043 -- and later compilations (ModDetails)
1044 -- * the other lot goes to code generation (CgGuts)
1046 -- | A restricted form of 'ModGuts' for code generation purposes
1049 cg_module :: !Module, -- ^ Module being compiled
1051 cg_tycons :: [TyCon],
1052 -- ^ Algebraic data types (including ones that started
1053 -- life as classes); generate constructors and info
1054 -- tables. Includes newtypes, just for the benefit of
1057 cg_binds :: [CoreBind],
1058 -- ^ The tidied main bindings, including
1059 -- previously-implicit bindings for record and class
1060 -- selectors, and data construtor wrappers. But *not*
1061 -- data constructor workers; reason: we we regard them
1062 -- as part of the code-gen of tycons
1064 cg_dir_imps :: ![Module],
1065 -- ^ Directly-imported modules; used to generate
1066 -- initialisation code
1068 cg_foreign :: !ForeignStubs, -- ^ Foreign export stubs
1069 cg_dep_pkgs :: ![PackageId], -- ^ Dependent packages, used to
1070 -- generate #includes for C code gen
1071 cg_hpc_info :: !HpcInfo, -- ^ Program coverage tick box information
1072 cg_modBreaks :: !ModBreaks -- ^ Module breakpoints
1075 -----------------------------------
1076 -- | Foreign export stubs
1077 data ForeignStubs = NoStubs -- ^ We don't have any stubs
1081 -- ^ There are some stubs. Parameters:
1083 -- 1) Header file prototypes for
1084 -- "foreign exported" functions
1086 -- 2) C stubs to use when calling
1087 -- "foreign exported" functions
1091 emptyModIface :: Module -> ModIface
1093 = ModIface { mi_module = mod,
1094 mi_iface_hash = fingerprint0,
1095 mi_mod_hash = fingerprint0,
1099 mi_deps = noDependencies,
1102 mi_exp_hash = fingerprint0,
1104 mi_warns = NoWarnings,
1110 mi_globals = Nothing,
1111 mi_orphan_hash = fingerprint0,
1112 mi_vect_info = noIfaceVectInfo,
1113 mi_warn_fn = emptyIfaceWarnCache,
1114 mi_fix_fn = emptyIfaceFixCache,
1115 mi_hash_fn = emptyIfaceHashCache,
1121 %************************************************************************
1123 \subsection{The interactive context}
1125 %************************************************************************
1128 -- | Interactive context, recording information relevant to GHCi
1129 data InteractiveContext
1130 = InteractiveContext {
1131 ic_toplev_scope :: [Module], -- ^ The context includes the "top-level" scope of
1134 ic_exports :: [Module], -- ^ The context includes just the exports of these
1137 ic_rn_gbl_env :: GlobalRdrEnv, -- ^ The contexts' cached 'GlobalRdrEnv', built from
1138 -- 'ic_toplev_scope' and 'ic_exports'
1140 ic_tmp_ids :: [Id], -- ^ Names bound during interaction with the user.
1141 -- Later Ids shadow earlier ones with the same OccName.
1143 ic_tyvars :: TyVarSet -- ^ Skolem type variables free in
1144 -- 'ic_tmp_ids'. These arise at
1145 -- breakpoints in a polymorphic
1146 -- context, where we have only partial
1147 -- type information.
1150 , ic_resume :: [Resume] -- ^ The stack of breakpoint contexts
1153 , ic_cwd :: Maybe FilePath -- virtual CWD of the program
1157 emptyInteractiveContext :: InteractiveContext
1158 emptyInteractiveContext
1159 = InteractiveContext { ic_toplev_scope = [],
1161 ic_rn_gbl_env = emptyGlobalRdrEnv,
1163 ic_tyvars = emptyVarSet
1170 icPrintUnqual :: DynFlags -> InteractiveContext -> PrintUnqualified
1171 icPrintUnqual dflags ictxt = mkPrintUnqualified dflags (ic_rn_gbl_env ictxt)
1174 extendInteractiveContext
1175 :: InteractiveContext
1178 -> InteractiveContext
1179 extendInteractiveContext ictxt ids tyvars
1180 = ictxt { ic_tmp_ids = snub((ic_tmp_ids ictxt \\ ids) ++ ids),
1181 -- NB. must be this way around, because we want
1182 -- new ids to shadow existing bindings.
1183 ic_tyvars = ic_tyvars ictxt `unionVarSet` tyvars }
1184 where snub = map head . group . sort
1186 substInteractiveContext :: InteractiveContext -> TvSubst -> InteractiveContext
1187 substInteractiveContext ictxt subst | isEmptyTvSubst subst = ictxt
1188 substInteractiveContext ictxt@InteractiveContext{ic_tmp_ids=ids} subst =
1189 let ids' = map (\id -> id `setIdType` substTy subst (idType id)) ids
1190 subst_dom= varEnvKeys$ getTvSubstEnv subst
1191 subst_ran= varEnvElts$ getTvSubstEnv subst
1192 new_tvs = [ tv | Just tv <- map getTyVar_maybe subst_ran]
1193 ic_tyvars'= (`delVarSetListByKey` subst_dom)
1194 . (`extendVarSetList` new_tvs)
1196 in ictxt { ic_tmp_ids = ids'
1197 , ic_tyvars = ic_tyvars' }
1199 where delVarSetListByKey = foldl' delVarSetByKey
1202 %************************************************************************
1204 Building a PrintUnqualified
1206 %************************************************************************
1208 Note [Printing original names]
1209 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1210 Deciding how to print names is pretty tricky. We are given a name
1211 P:M.T, where P is the package name, M is the defining module, and T is
1212 the occurrence name, and we have to decide in which form to display
1213 the name given a GlobalRdrEnv describing the current scope.
1215 Ideally we want to display the name in the form in which it is in
1216 scope. However, the name might not be in scope at all, and that's
1217 where it gets tricky. Here are the cases:
1219 1. T uniquely maps to P:M.T ---> "T" NameUnqual
1220 2. There is an X for which X.T
1221 uniquely maps to P:M.T ---> "X.T" NameQual X
1222 3. There is no binding for "M.T" ---> "M.T" NameNotInScope1
1223 4. Otherwise ---> "P:M.T" NameNotInScope2
1225 (3) and (4) apply when the entity P:M.T is not in the GlobalRdrEnv at
1226 all. In these cases we still want to refer to the name as "M.T", *but*
1227 "M.T" might mean something else in the current scope (e.g. if there's
1228 an "import X as M"), so to avoid confusion we avoid using "M.T" if
1229 there's already a binding for it. Instead we write P:M.T.
1231 There's one further subtlety: in case (3), what if there are two
1232 things around, P1:M.T and P2:M.T? Then we don't want to print both of
1233 them as M.T! However only one of the modules P1:M and P2:M can be
1234 exposed (say P2), so we use M.T for that, and P1:M.T for the other one.
1235 This is handled by the qual_mod component of PrintUnqualified, inside
1236 the (ppr mod) of case (3), in Name.pprModulePrefix
1239 -- | Creates some functions that work out the best ways to format
1240 -- names for the user according to a set of heuristics
1241 mkPrintUnqualified :: DynFlags -> GlobalRdrEnv -> PrintUnqualified
1242 mkPrintUnqualified dflags env = (qual_name, qual_mod)
1244 qual_name mod occ -- The (mod,occ) pair is the original name of the thing
1245 | [gre] <- unqual_gres, right_name gre = NameUnqual
1246 -- If there's a unique entity that's in scope unqualified with 'occ'
1247 -- AND that entity is the right one, then we can use the unqualified name
1249 | [gre] <- qual_gres = NameQual (get_qual_mod (gre_prov gre))
1252 if null (lookupGRE_RdrName (mkRdrQual (moduleName mod) occ) env)
1253 then NameNotInScope1
1254 else NameNotInScope2
1256 | otherwise = panic "mkPrintUnqualified"
1258 right_name gre = nameModule_maybe (gre_name gre) == Just mod
1260 unqual_gres = lookupGRE_RdrName (mkRdrUnqual occ) env
1261 qual_gres = filter right_name (lookupGlobalRdrEnv env occ)
1263 get_qual_mod LocalDef = moduleName mod
1264 get_qual_mod (Imported is) = ASSERT( not (null is) ) is_as (is_decl (head is))
1266 -- we can mention a module P:M without the P: qualifier iff
1267 -- "import M" would resolve unambiguously to P:M. (if P is the
1268 -- current package we can just assume it is unqualified).
1271 | modulePackageId mod == thisPackage dflags = False
1273 | [pkgconfig] <- [pkg | (pkg,exposed_module) <- lookup,
1274 exposed pkg && exposed_module],
1275 packageConfigId pkgconfig == modulePackageId mod
1276 -- this says: we are given a module P:M, is there just one exposed package
1277 -- that exposes a module M, and is it package P?
1281 where lookup = lookupModuleInAllPackages dflags (moduleName mod)
1285 %************************************************************************
1289 %************************************************************************
1292 -- | Determine the 'TyThing's brought into scope by another 'TyThing'
1293 -- /other/ than itself. For example, Id's don't have any implicit TyThings
1294 -- as they just bring themselves into scope, but classes bring their
1295 -- dictionary datatype, type constructor and some selector functions into
1296 -- scope, just for a start!
1298 -- N.B. the set of TyThings returned here *must* match the set of
1299 -- names returned by LoadIface.ifaceDeclSubBndrs, in the sense that
1300 -- TyThing.getOccName should define a bijection between the two lists.
1301 -- This invariant is used in LoadIface.loadDecl (see note [Tricky iface loop])
1302 -- The order of the list does not matter.
1303 implicitTyThings :: TyThing -> [TyThing]
1305 -- For data and newtype declarations:
1306 implicitTyThings (ATyCon tc)
1307 = -- fields (names of selectors)
1308 -- (possibly) implicit coercion and family coercion
1309 -- depending on whether it's a newtype or a family instance or both
1310 implicitCoTyCon tc ++
1311 -- for each data constructor in order,
1312 -- the contructor, worker, and (possibly) wrapper
1313 concatMap (extras_plus . ADataCon) (tyConDataCons tc)
1315 implicitTyThings (AClass cl)
1316 = -- dictionary datatype:
1319 -- [recursive call:]
1320 -- (possibly) newtype coercion; definitely no family coercion here
1323 -- (no wrapper by invariant)
1324 extras_plus (ATyCon (classTyCon cl)) ++
1326 -- No extras_plus (recursive call) for the classATs, because they
1327 -- are only the family decls; they have no implicit things
1328 map ATyCon (classATs cl) ++
1329 -- superclass and operation selectors
1330 map AnId (classSelIds cl)
1332 implicitTyThings (ADataCon dc) =
1333 -- For data cons add the worker and (possibly) wrapper
1334 map AnId (dataConImplicitIds dc)
1336 implicitTyThings (AnId _) = []
1338 -- add a thing and recursive call
1339 extras_plus :: TyThing -> [TyThing]
1340 extras_plus thing = thing : implicitTyThings thing
1342 -- For newtypes and indexed data types (and both),
1343 -- add the implicit coercion tycon
1344 implicitCoTyCon :: TyCon -> [TyThing]
1346 = map ATyCon . catMaybes $ [-- Just if newtype, Nothing if not
1347 newTyConCo_maybe tc,
1348 -- Just if family instance, Nothing if not
1349 tyConFamilyCoercion_maybe tc]
1351 -- sortByOcc = sortBy (\ x -> \ y -> getOccName x < getOccName y)
1354 -- | Returns @True@ if there should be no interface-file declaration
1355 -- for this thing on its own: either it is built-in, or it is part
1356 -- of some other declaration, or it is generated implicitly by some
1357 -- other declaration.
1358 isImplicitTyThing :: TyThing -> Bool
1359 isImplicitTyThing (ADataCon _) = True
1360 isImplicitTyThing (AnId id) = isImplicitId id
1361 isImplicitTyThing (AClass _) = False
1362 isImplicitTyThing (ATyCon tc) = isImplicitTyCon tc
1364 extendTypeEnvWithIds :: TypeEnv -> [Id] -> TypeEnv
1365 extendTypeEnvWithIds env ids
1366 = extendNameEnvList env [(getName id, AnId id) | id <- ids]
1369 %************************************************************************
1373 %************************************************************************
1376 -- | A map from 'Name's to 'TyThing's, constructed by typechecking
1377 -- local declarations or interface files
1378 type TypeEnv = NameEnv TyThing
1380 emptyTypeEnv :: TypeEnv
1381 typeEnvElts :: TypeEnv -> [TyThing]
1382 typeEnvClasses :: TypeEnv -> [Class]
1383 typeEnvTyCons :: TypeEnv -> [TyCon]
1384 typeEnvIds :: TypeEnv -> [Id]
1385 typeEnvDataCons :: TypeEnv -> [DataCon]
1386 lookupTypeEnv :: TypeEnv -> Name -> Maybe TyThing
1388 emptyTypeEnv = emptyNameEnv
1389 typeEnvElts env = nameEnvElts env
1390 typeEnvClasses env = [cl | AClass cl <- typeEnvElts env]
1391 typeEnvTyCons env = [tc | ATyCon tc <- typeEnvElts env]
1392 typeEnvIds env = [id | AnId id <- typeEnvElts env]
1393 typeEnvDataCons env = [dc | ADataCon dc <- typeEnvElts env]
1395 mkTypeEnv :: [TyThing] -> TypeEnv
1396 mkTypeEnv things = extendTypeEnvList emptyTypeEnv things
1398 lookupTypeEnv = lookupNameEnv
1400 -- Extend the type environment
1401 extendTypeEnv :: TypeEnv -> TyThing -> TypeEnv
1402 extendTypeEnv env thing = extendNameEnv env (getName thing) thing
1404 extendTypeEnvList :: TypeEnv -> [TyThing] -> TypeEnv
1405 extendTypeEnvList env things = foldl extendTypeEnv env things
1409 -- | Find the 'TyThing' for the given 'Name' by using all the resources
1410 -- at our disposal: the compiled modules in the 'HomePackageTable' and the
1411 -- compiled modules in other packages that live in 'PackageTypeEnv'. Note
1412 -- that this does NOT look up the 'TyThing' in the module being compiled: you
1413 -- have to do that yourself, if desired
1414 lookupType :: DynFlags
1420 lookupType dflags hpt pte name
1421 -- in one-shot, we don't use the HPT
1422 | not (isOneShot (ghcMode dflags)) && modulePackageId mod == this_pkg
1423 = do hm <- lookupUFM hpt (moduleName mod) -- Maybe monad
1424 lookupNameEnv (md_types (hm_details hm)) name
1426 = lookupNameEnv pte name
1427 where mod = ASSERT( isExternalName name ) nameModule name
1428 this_pkg = thisPackage dflags
1430 -- | As 'lookupType', but with a marginally easier-to-use interface
1431 -- if you have a 'HscEnv'
1432 lookupTypeHscEnv :: HscEnv -> Name -> IO (Maybe TyThing)
1433 lookupTypeHscEnv hsc_env name = do
1434 eps <- readIORef (hsc_EPS hsc_env)
1435 return $! lookupType dflags hpt (eps_PTE eps) name
1437 dflags = hsc_dflags hsc_env
1438 hpt = hsc_HPT hsc_env
1442 -- | Get the 'TyCon' from a 'TyThing' if it is a type constructor thing. Panics otherwise
1443 tyThingTyCon :: TyThing -> TyCon
1444 tyThingTyCon (ATyCon tc) = tc
1445 tyThingTyCon other = pprPanic "tyThingTyCon" (pprTyThing other)
1447 -- | Get the 'Class' from a 'TyThing' if it is a class thing. Panics otherwise
1448 tyThingClass :: TyThing -> Class
1449 tyThingClass (AClass cls) = cls
1450 tyThingClass other = pprPanic "tyThingClass" (pprTyThing other)
1452 -- | Get the 'DataCon' from a 'TyThing' if it is a data constructor thing. Panics otherwise
1453 tyThingDataCon :: TyThing -> DataCon
1454 tyThingDataCon (ADataCon dc) = dc
1455 tyThingDataCon other = pprPanic "tyThingDataCon" (pprTyThing other)
1457 -- | Get the 'Id' from a 'TyThing' if it is a id *or* data constructor thing. Panics otherwise
1458 tyThingId :: TyThing -> Id
1459 tyThingId (AnId id) = id
1460 tyThingId (ADataCon dc) = dataConWrapId dc
1461 tyThingId other = pprPanic "tyThingId" (pprTyThing other)
1464 %************************************************************************
1466 \subsection{MonadThings and friends}
1468 %************************************************************************
1471 -- | Class that abstracts out the common ability of the monads in GHC
1472 -- to lookup a 'TyThing' in the monadic environment by 'Name'. Provides
1473 -- a number of related convenience functions for accessing particular
1474 -- kinds of 'TyThing'
1475 class Monad m => MonadThings m where
1476 lookupThing :: Name -> m TyThing
1478 lookupId :: Name -> m Id
1479 lookupId = liftM tyThingId . lookupThing
1481 lookupDataCon :: Name -> m DataCon
1482 lookupDataCon = liftM tyThingDataCon . lookupThing
1484 lookupTyCon :: Name -> m TyCon
1485 lookupTyCon = liftM tyThingTyCon . lookupThing
1487 lookupClass :: Name -> m Class
1488 lookupClass = liftM tyThingClass . lookupThing
1492 -- | Constructs cache for the 'mi_hash_fn' field of a 'ModIface'
1493 mkIfaceHashCache :: [(Fingerprint,IfaceDecl)]
1494 -> (OccName -> Maybe (OccName, Fingerprint))
1495 mkIfaceHashCache pairs
1496 = \occ -> lookupOccEnv env occ
1498 env = foldr add_decl emptyOccEnv pairs
1499 add_decl (v,d) env0 = foldr add_imp env1 (ifaceDeclSubBndrs d)
1501 decl_name = ifName d
1502 env1 = extendOccEnv env0 decl_name (decl_name, v)
1503 add_imp bndr env = extendOccEnv env bndr (decl_name, v)
1505 emptyIfaceHashCache :: OccName -> Maybe (OccName, Fingerprint)
1506 emptyIfaceHashCache _occ = Nothing
1509 %************************************************************************
1511 \subsection{Auxiliary types}
1513 %************************************************************************
1515 These types are defined here because they are mentioned in ModDetails,
1516 but they are mostly elaborated elsewhere
1519 ------------------ Warnings -------------------------
1520 -- | Warning information for a module
1522 = NoWarnings -- ^ Nothing deprecated
1523 | WarnAll WarningTxt -- ^ Whole module deprecated
1524 | WarnSome [(OccName,WarningTxt)] -- ^ Some specific things deprecated
1526 -- Only an OccName is needed because
1527 -- (1) a deprecation always applies to a binding
1528 -- defined in the module in which the deprecation appears.
1529 -- (2) deprecations are only reported outside the defining module.
1530 -- this is important because, otherwise, if we saw something like
1532 -- {-# DEPRECATED f "" #-}
1535 -- g = let f = undefined in f
1537 -- we'd need more information than an OccName to know to say something
1538 -- about the use of f in h but not the use of the locally bound f in g
1540 -- however, because we only report about deprecations from the outside,
1541 -- and a module can only export one value called f,
1542 -- an OccName suffices.
1544 -- this is in contrast with fixity declarations, where we need to map
1545 -- a Name to its fixity declaration.
1548 -- | Constructs the cache for the 'mi_warn_fn' field of a 'ModIface'
1549 mkIfaceWarnCache :: Warnings -> Name -> Maybe WarningTxt
1550 mkIfaceWarnCache NoWarnings = \_ -> Nothing
1551 mkIfaceWarnCache (WarnAll t) = \_ -> Just t
1552 mkIfaceWarnCache (WarnSome pairs) = lookupOccEnv (mkOccEnv pairs) . nameOccName
1554 emptyIfaceWarnCache :: Name -> Maybe WarningTxt
1555 emptyIfaceWarnCache _ = Nothing
1557 plusWarns :: Warnings -> Warnings -> Warnings
1558 plusWarns d NoWarnings = d
1559 plusWarns NoWarnings d = d
1560 plusWarns _ (WarnAll t) = WarnAll t
1561 plusWarns (WarnAll t) _ = WarnAll t
1562 plusWarns (WarnSome v1) (WarnSome v2) = WarnSome (v1 ++ v2)
1565 -- | A collection of 'AvailInfo' - several things that are \"available\"
1566 type Avails = [AvailInfo]
1567 -- | 'Name'd things that are available
1568 type AvailInfo = GenAvailInfo Name
1569 -- | 'RdrName'd things that are available
1570 type RdrAvailInfo = GenAvailInfo OccName
1572 -- | Records what things are "available", i.e. in scope
1573 data GenAvailInfo name = Avail name -- ^ An ordinary identifier in scope
1575 [name] -- ^ A type or class in scope. Parameters:
1577 -- 1) The name of the type or class
1579 -- 2) The available pieces of type or class.
1580 -- NB: If the type or class is itself
1581 -- to be in scope, it must be in this list.
1582 -- Thus, typically: @AvailTC Eq [Eq, ==, \/=]@
1584 -- Equality used when deciding if the interface has changed
1586 -- | The original names declared of a certain module that are exported
1587 type IfaceExport = (Module, [GenAvailInfo OccName])
1589 availsToNameSet :: [AvailInfo] -> NameSet
1590 availsToNameSet avails = foldr add emptyNameSet avails
1591 where add avail set = addListToNameSet set (availNames avail)
1593 availsToNameEnv :: [AvailInfo] -> NameEnv AvailInfo
1594 availsToNameEnv avails = foldr add emptyNameEnv avails
1595 where add avail env = extendNameEnvList env
1596 (zip (availNames avail) (repeat avail))
1598 -- | Just the main name made available, i.e. not the available pieces
1599 -- of type or class brought into scope by the 'GenAvailInfo'
1600 availName :: GenAvailInfo name -> name
1601 availName (Avail n) = n
1602 availName (AvailTC n _) = n
1604 -- | All names made available by the availability information
1605 availNames :: GenAvailInfo name -> [name]
1606 availNames (Avail n) = [n]
1607 availNames (AvailTC _ ns) = ns
1609 instance Outputable n => Outputable (GenAvailInfo n) where
1612 pprAvail :: Outputable n => GenAvailInfo n -> SDoc
1613 pprAvail (Avail n) = ppr n
1614 pprAvail (AvailTC n ns) = ppr n <> braces (hsep (punctuate comma (map ppr ns)))
1618 -- | Creates cached lookup for the 'mi_fix_fn' field of 'ModIface'
1619 mkIfaceFixCache :: [(OccName, Fixity)] -> OccName -> Fixity
1620 mkIfaceFixCache pairs
1621 = \n -> lookupOccEnv env n `orElse` defaultFixity
1623 env = mkOccEnv pairs
1625 emptyIfaceFixCache :: OccName -> Fixity
1626 emptyIfaceFixCache _ = defaultFixity
1628 -- | Fixity environment mapping names to their fixities
1629 type FixityEnv = NameEnv FixItem
1631 -- | Fixity information for an 'Name'. We keep the OccName in the range
1632 -- so that we can generate an interface from it
1633 data FixItem = FixItem OccName Fixity
1635 instance Outputable FixItem where
1636 ppr (FixItem occ fix) = ppr fix <+> ppr occ
1638 emptyFixityEnv :: FixityEnv
1639 emptyFixityEnv = emptyNameEnv
1641 lookupFixity :: FixityEnv -> Name -> Fixity
1642 lookupFixity env n = case lookupNameEnv env n of
1643 Just (FixItem _ fix) -> fix
1644 Nothing -> defaultFixity
1648 %************************************************************************
1650 \subsection{WhatsImported}
1652 %************************************************************************
1655 -- | Records whether a module has orphans. An \"orphan\" is one of:
1657 -- * An instance declaration in a module other than the definition
1658 -- module for one of the type constructors or classes in the instance head
1660 -- * A transformation rule in a module other than the one defining
1661 -- the function in the head of the rule
1662 type WhetherHasOrphans = Bool
1664 -- | Does this module define family instances?
1665 type WhetherHasFamInst = Bool
1667 -- | Did this module originate from a *-boot file?
1668 type IsBootInterface = Bool
1670 -- | Dependency information about modules and packages below this one
1671 -- in the import hierarchy.
1673 -- Invariant: the dependencies of a module @M@ never includes @M@.
1675 -- Invariant: none of the lists contain duplicates.
1677 = Deps { dep_mods :: [(ModuleName, IsBootInterface)]
1678 -- ^ Home-package module dependencies
1679 , dep_pkgs :: [PackageId]
1680 -- ^ External package dependencies
1681 , dep_orphs :: [Module]
1682 -- ^ Orphan modules (whether home or external pkg),
1683 -- *not* including family instance orphans as they
1684 -- are anyway included in 'dep_finsts'
1685 , dep_finsts :: [Module]
1686 -- ^ Modules that contain family instances (whether the
1687 -- instances are from the home or an external package)
1690 -- Equality used only for old/new comparison in MkIface.addVersionInfo
1692 -- See 'TcRnTypes.ImportAvails' for details on dependencies.
1694 noDependencies :: Dependencies
1695 noDependencies = Deps [] [] [] []
1697 -- | Records modules that we depend on by making a direct import from
1699 = UsagePackageModule {
1701 -- ^ External package module depended on
1702 usg_mod_hash :: Fingerprint
1703 } -- ^ Module from another package
1705 usg_mod_name :: ModuleName,
1706 -- ^ Name of the module
1707 usg_mod_hash :: Fingerprint,
1708 -- ^ Cached module fingerprint
1709 usg_entities :: [(OccName,Fingerprint)],
1710 -- ^ Entities we depend on, sorted by occurrence name and fingerprinted.
1711 -- NB: usages are for parent names only, e.g. type constructors
1712 -- but not the associated data constructors.
1713 usg_exports :: Maybe Fingerprint
1714 -- ^ Fingerprint for the export list we used to depend on this module,
1715 -- if we depend on the export list
1716 } -- ^ Module from the current package
1718 -- The export list field is (Just v) if we depend on the export list:
1719 -- i.e. we imported the module directly, whether or not we
1720 -- enumerated the things we imported, or just imported
1722 -- We need to recompile if M's exports change, because
1723 -- if the import was import M, we might now have a name clash
1724 -- in the importing module.
1725 -- if the import was import M(x) M might no longer export x
1726 -- The only way we don't depend on the export list is if we have
1728 -- And of course, for modules that aren't imported directly we don't
1729 -- depend on their export lists
1733 %************************************************************************
1735 The External Package State
1737 %************************************************************************
1740 type PackageTypeEnv = TypeEnv
1741 type PackageRuleBase = RuleBase
1742 type PackageInstEnv = InstEnv
1743 type PackageFamInstEnv = FamInstEnv
1744 type PackageVectInfo = VectInfo
1745 type PackageAnnEnv = AnnEnv
1747 -- | Information about other packages that we have slurped in by reading
1748 -- their interface files
1749 data ExternalPackageState
1751 eps_is_boot :: !(ModuleNameEnv (ModuleName, IsBootInterface)),
1752 -- ^ In OneShot mode (only), home-package modules
1753 -- accumulate in the external package state, and are
1754 -- sucked in lazily. For these home-pkg modules
1755 -- (only) we need to record which are boot modules.
1756 -- We set this field after loading all the
1757 -- explicitly-imported interfaces, but before doing
1760 -- The 'ModuleName' part is not necessary, but it's useful for
1761 -- debug prints, and it's convenient because this field comes
1762 -- direct from 'TcRnTypes.imp_dep_mods'
1764 eps_PIT :: !PackageIfaceTable,
1765 -- ^ The 'ModIface's for modules in external packages
1766 -- whose interfaces we have opened.
1767 -- The declarations in these interface files are held in the
1768 -- 'eps_decls', 'eps_inst_env', 'eps_fam_inst_env' and 'eps_rules'
1769 -- fields of this record, not in the 'mi_decls' fields of the
1770 -- interface we have sucked in.
1772 -- What /is/ in the PIT is:
1776 -- * Fingerprint info
1782 -- * Deprecations and warnings
1784 eps_PTE :: !PackageTypeEnv,
1785 -- ^ Result of typechecking all the external package
1786 -- interface files we have sucked in. The domain of
1787 -- the mapping is external-package modules
1789 eps_inst_env :: !PackageInstEnv, -- ^ The total 'InstEnv' accumulated
1790 -- from all the external-package modules
1791 eps_fam_inst_env :: !PackageFamInstEnv,-- ^ The total 'FamInstEnv' accumulated
1792 -- from all the external-package modules
1793 eps_rule_base :: !PackageRuleBase, -- ^ The total 'RuleEnv' accumulated
1794 -- from all the external-package modules
1795 eps_vect_info :: !PackageVectInfo, -- ^ The total 'VectInfo' accumulated
1796 -- from all the external-package modules
1797 eps_ann_env :: !PackageAnnEnv, -- ^ The total 'AnnEnv' accumulated
1798 -- from all the external-package modules
1800 eps_mod_fam_inst_env :: !(ModuleEnv FamInstEnv), -- ^ The family instances accumulated from external
1801 -- packages, keyed off the module that declared them
1803 eps_stats :: !EpsStats -- ^ Stastics about what was loaded from external packages
1806 -- | Accumulated statistics about what we are putting into the 'ExternalPackageState'.
1807 -- \"In\" means stuff that is just /read/ from interface files,
1808 -- \"Out\" means actually sucked in and type-checked
1809 data EpsStats = EpsStats { n_ifaces_in
1810 , n_decls_in, n_decls_out
1811 , n_rules_in, n_rules_out
1812 , n_insts_in, n_insts_out :: !Int }
1814 addEpsInStats :: EpsStats -> Int -> Int -> Int -> EpsStats
1815 -- ^ Add stats for one newly-read interface
1816 addEpsInStats stats n_decls n_insts n_rules
1817 = stats { n_ifaces_in = n_ifaces_in stats + 1
1818 , n_decls_in = n_decls_in stats + n_decls
1819 , n_insts_in = n_insts_in stats + n_insts
1820 , n_rules_in = n_rules_in stats + n_rules }
1823 Names in a NameCache are always stored as a Global, and have the SrcLoc
1824 of their binding locations.
1826 Actually that's not quite right. When we first encounter the original
1827 name, we might not be at its binding site (e.g. we are reading an
1828 interface file); so we give it 'noSrcLoc' then. Later, when we find
1829 its binding site, we fix it up.
1832 -- | The NameCache makes sure that there is just one Unique assigned for
1833 -- each original name; i.e. (module-name, occ-name) pair and provides
1834 -- something of a lookup mechanism for those names.
1836 = NameCache { nsUniqs :: UniqSupply,
1837 -- ^ Supply of uniques
1838 nsNames :: OrigNameCache,
1839 -- ^ Ensures that one original name gets one unique
1840 nsIPs :: OrigIParamCache
1841 -- ^ Ensures that one implicit parameter name gets one unique
1844 -- | Per-module cache of original 'OccName's given 'Name's
1845 type OrigNameCache = ModuleEnv (OccEnv Name)
1847 -- | Module-local cache of implicit parameter 'OccName's given 'Name's
1848 type OrigIParamCache = FiniteMap (IPName OccName) (IPName Name)
1853 %************************************************************************
1855 The module graph and ModSummary type
1856 A ModSummary is a node in the compilation manager's
1857 dependency graph, and it's also passed to hscMain
1859 %************************************************************************
1862 -- | A ModuleGraph contains all the nodes from the home package (only).
1863 -- There will be a node for each source module, plus a node for each hi-boot
1866 -- The graph is not necessarily stored in topologically-sorted order. Use
1867 -- 'GHC.topSortModuleGraph' and 'Digraph.flattenSCC' to achieve this.
1868 type ModuleGraph = [ModSummary]
1870 emptyMG :: ModuleGraph
1873 -- | A single node in a 'ModuleGraph. The nodes of the module graph are one of:
1875 -- * A regular Haskell source module
1877 -- * A hi-boot source module
1879 -- * An external-core source module
1882 ms_mod :: Module, -- ^ Identity of the module
1883 ms_hsc_src :: HscSource, -- ^ The module source either plain Haskell, hs-boot or external core
1884 ms_location :: ModLocation, -- ^ Location of the various files belonging to the module
1885 ms_hs_date :: ClockTime, -- ^ Timestamp of source file
1886 ms_obj_date :: Maybe ClockTime, -- ^ Timestamp of object, if we have one
1887 ms_srcimps :: [Located (ImportDecl RdrName)], -- ^ Source imports of the module
1888 ms_imps :: [Located (ImportDecl RdrName)], -- ^ Non-source imports of the module
1889 ms_hspp_file :: FilePath, -- ^ Filename of preprocessed source file
1890 ms_hspp_opts :: DynFlags, -- ^ Cached flags from @OPTIONS@, @INCLUDE@
1891 -- and @LANGUAGE@ pragmas in the modules source code
1892 ms_hspp_buf :: Maybe StringBuffer -- ^ The actual preprocessed source, if we have it
1895 ms_mod_name :: ModSummary -> ModuleName
1896 ms_mod_name = moduleName . ms_mod
1898 -- The ModLocation contains both the original source filename and the
1899 -- filename of the cleaned-up source file after all preprocessing has been
1900 -- done. The point is that the summariser will have to cpp/unlit/whatever
1901 -- all files anyway, and there's no point in doing this twice -- just
1902 -- park the result in a temp file, put the name of it in the location,
1903 -- and let @compile@ read from that file on the way back up.
1905 -- The ModLocation is stable over successive up-sweeps in GHCi, wheres
1906 -- the ms_hs_date and imports can, of course, change
1908 msHsFilePath, msHiFilePath, msObjFilePath :: ModSummary -> FilePath
1909 msHsFilePath ms = expectJust "msHsFilePath" (ml_hs_file (ms_location ms))
1910 msHiFilePath ms = ml_hi_file (ms_location ms)
1911 msObjFilePath ms = ml_obj_file (ms_location ms)
1913 -- | Did this 'ModSummary' originate from a hs-boot file?
1914 isBootSummary :: ModSummary -> Bool
1915 isBootSummary ms = isHsBoot (ms_hsc_src ms)
1917 instance Outputable ModSummary where
1919 = sep [text "ModSummary {",
1920 nest 3 (sep [text "ms_hs_date = " <> text (show (ms_hs_date ms)),
1921 text "ms_mod =" <+> ppr (ms_mod ms)
1922 <> text (hscSourceString (ms_hsc_src ms)) <> comma,
1923 text "ms_imps =" <+> ppr (ms_imps ms),
1924 text "ms_srcimps =" <+> ppr (ms_srcimps ms)]),
1928 showModMsg :: HscTarget -> Bool -> ModSummary -> String
1929 showModMsg target recomp mod_summary
1931 hsep [text (mod_str ++ replicate (max 0 (16 - length mod_str)) ' '),
1932 char '(', text (normalise $ msHsFilePath mod_summary) <> comma,
1934 HscInterpreted | recomp
1935 -> text "interpreted"
1936 HscNothing -> text "nothing"
1937 _ -> text (normalise $ msObjFilePath mod_summary),
1940 mod = moduleName (ms_mod mod_summary)
1941 mod_str = showSDoc (ppr mod) ++ hscSourceString (ms_hsc_src mod_summary)
1945 %************************************************************************
1947 \subsection{Hpc Support}
1949 %************************************************************************
1952 -- | Information about a modules use of Haskell Program Coverage
1955 { hpcInfoTickCount :: Int
1956 , hpcInfoHash :: Int
1959 { hpcUsed :: AnyHpcUsage -- ^ Is hpc used anywhere on the module \*tree\*?
1962 -- | This is used to signal if one of my imports used HPC instrumentation
1963 -- even if there is no module-local HPC usage
1964 type AnyHpcUsage = Bool
1966 emptyHpcInfo :: AnyHpcUsage -> HpcInfo
1967 emptyHpcInfo = NoHpcInfo
1969 -- | Find out if HPC is used by this module or any of the modules
1971 isHpcUsed :: HpcInfo -> AnyHpcUsage
1972 isHpcUsed (HpcInfo {}) = True
1973 isHpcUsed (NoHpcInfo { hpcUsed = used }) = used
1976 %************************************************************************
1978 \subsection{Vectorisation Support}
1980 %************************************************************************
1982 The following information is generated and consumed by the vectorisation
1983 subsystem. It communicates the vectorisation status of declarations from one
1986 Why do we need both f and f_v in the ModGuts/ModDetails/EPS version VectInfo
1987 below? We need to know `f' when converting to IfaceVectInfo. However, during
1988 vectorisation, we need to know `f_v', whose `Var' we cannot lookup based
1989 on just the OccName easily in a Core pass.
1992 -- | Vectorisation information for 'ModGuts', 'ModDetails' and 'ExternalPackageState'.
1993 -- All of this information is always tidy, even in ModGuts.
1996 vectInfoVar :: VarEnv (Var , Var ), -- ^ @(f, f_v)@ keyed on @f@
1997 vectInfoTyCon :: NameEnv (TyCon , TyCon), -- ^ @(T, T_v)@ keyed on @T@
1998 vectInfoDataCon :: NameEnv (DataCon, DataCon), -- ^ @(C, C_v)@ keyed on @C@
1999 vectInfoPADFun :: NameEnv (TyCon , Var), -- ^ @(T_v, paT)@ keyed on @T_v@
2000 vectInfoIso :: NameEnv (TyCon , Var) -- ^ @(T, isoT)@ keyed on @T@
2003 -- | Vectorisation information for 'ModIface': a slightly less low-level view
2006 ifaceVectInfoVar :: [Name],
2007 -- ^ All variables in here have a vectorised variant
2008 ifaceVectInfoTyCon :: [Name],
2009 -- ^ All 'TyCon's in here have a vectorised variant;
2010 -- the name of the vectorised variant and those of its
2011 -- data constructors are determined by 'OccName.mkVectTyConOcc'
2012 -- and 'OccName.mkVectDataConOcc'; the names of
2013 -- the isomorphisms are determined by 'OccName.mkVectIsoOcc'
2014 ifaceVectInfoTyConReuse :: [Name]
2015 -- ^ The vectorised form of all the 'TyCon's in here coincides with
2016 -- the unconverted form; the name of the isomorphisms is determined
2017 -- by 'OccName.mkVectIsoOcc'
2020 noVectInfo :: VectInfo
2021 noVectInfo = VectInfo emptyVarEnv emptyNameEnv emptyNameEnv emptyNameEnv emptyNameEnv
2023 plusVectInfo :: VectInfo -> VectInfo -> VectInfo
2024 plusVectInfo vi1 vi2 =
2025 VectInfo (vectInfoVar vi1 `plusVarEnv` vectInfoVar vi2)
2026 (vectInfoTyCon vi1 `plusNameEnv` vectInfoTyCon vi2)
2027 (vectInfoDataCon vi1 `plusNameEnv` vectInfoDataCon vi2)
2028 (vectInfoPADFun vi1 `plusNameEnv` vectInfoPADFun vi2)
2029 (vectInfoIso vi1 `plusNameEnv` vectInfoIso vi2)
2031 concatVectInfo :: [VectInfo] -> VectInfo
2032 concatVectInfo = foldr plusVectInfo noVectInfo
2034 noIfaceVectInfo :: IfaceVectInfo
2035 noIfaceVectInfo = IfaceVectInfo [] [] []
2038 %************************************************************************
2040 \subsection{Linkable stuff}
2042 %************************************************************************
2044 This stuff is in here, rather than (say) in Linker.lhs, because the Linker.lhs
2045 stuff is the *dynamic* linker, and isn't present in a stage-1 compiler
2048 -- | Information we can use to dynamically link modules into the compiler
2049 data Linkable = LM {
2050 linkableTime :: ClockTime, -- ^ Time at which this linkable was built
2051 -- (i.e. when the bytecodes were produced,
2052 -- or the mod date on the files)
2053 linkableModule :: Module, -- ^ The linkable module itself
2054 linkableUnlinked :: [Unlinked]
2055 -- ^ Those files and chunks of code we have yet to link.
2057 -- INVARIANT: A valid linkable always has at least one 'Unlinked' item.
2058 -- If this list is empty, the Linkable represents a fake linkable, which
2059 -- is generated in HscNothing mode to avoid recompiling modules.
2061 -- XXX: Do items get removed from this list when they get linked?
2064 isObjectLinkable :: Linkable -> Bool
2065 isObjectLinkable l = not (null unlinked) && all isObject unlinked
2066 where unlinked = linkableUnlinked l
2067 -- A linkable with no Unlinked's is treated as a BCO. We can
2068 -- generate a linkable with no Unlinked's as a result of
2069 -- compiling a module in HscNothing mode, and this choice
2070 -- happens to work well with checkStability in module GHC.
2072 instance Outputable Linkable where
2073 ppr (LM when_made mod unlinkeds)
2074 = (text "LinkableM" <+> parens (text (show when_made)) <+> ppr mod)
2075 $$ nest 3 (ppr unlinkeds)
2077 -------------------------------------------
2079 -- | Objects which have yet to be linked by the compiler
2081 = DotO FilePath -- ^ An object file (.o)
2082 | DotA FilePath -- ^ Static archive file (.a)
2083 | DotDLL FilePath -- ^ Dynamically linked library file (.so, .dll, .dylib)
2084 | BCOs CompiledByteCode ModBreaks -- ^ A byte-code object, lives only in memory
2087 data CompiledByteCode = CompiledByteCodeUndefined
2088 _unused :: CompiledByteCode
2089 _unused = CompiledByteCodeUndefined
2092 instance Outputable Unlinked where
2093 ppr (DotO path) = text "DotO" <+> text path
2094 ppr (DotA path) = text "DotA" <+> text path
2095 ppr (DotDLL path) = text "DotDLL" <+> text path
2097 ppr (BCOs bcos _) = text "BCOs" <+> ppr bcos
2099 ppr (BCOs _ _) = text "No byte code"
2102 -- | Is this an actual file on disk we can link in somehow?
2103 isObject :: Unlinked -> Bool
2104 isObject (DotO _) = True
2105 isObject (DotA _) = True
2106 isObject (DotDLL _) = True
2109 -- | Is this a bytecode linkable with no file on disk?
2110 isInterpretable :: Unlinked -> Bool
2111 isInterpretable = not . isObject
2113 -- | Retrieve the filename of the linkable if possible. Panic if it is a byte-code object
2114 nameOfObject :: Unlinked -> FilePath
2115 nameOfObject (DotO fn) = fn
2116 nameOfObject (DotA fn) = fn
2117 nameOfObject (DotDLL fn) = fn
2118 nameOfObject other = pprPanic "nameOfObject" (ppr other)
2120 -- | Retrieve the compiled byte-code if possible. Panic if it is a file-based linkable
2121 byteCodeOfObject :: Unlinked -> CompiledByteCode
2122 byteCodeOfObject (BCOs bc _) = bc
2123 byteCodeOfObject other = pprPanic "byteCodeOfObject" (ppr other)
2126 %************************************************************************
2128 \subsection{Breakpoint Support}
2130 %************************************************************************
2133 -- | Breakpoint index
2134 type BreakIndex = Int
2136 -- | All the information about the breakpoints for a given module
2139 { modBreaks_flags :: BreakArray
2140 -- ^ The array of flags, one per breakpoint,
2141 -- indicating which breakpoints are enabled.
2142 , modBreaks_locs :: !(Array BreakIndex SrcSpan)
2143 -- ^ An array giving the source span of each breakpoint.
2144 , modBreaks_vars :: !(Array BreakIndex [OccName])
2145 -- ^ An array giving the names of the free variables at each breakpoint.
2148 emptyModBreaks :: ModBreaks
2149 emptyModBreaks = ModBreaks
2150 { modBreaks_flags = error "ModBreaks.modBreaks_array not initialised"
2151 -- Todo: can we avoid this?
2152 , modBreaks_locs = array (0,-1) []
2153 , modBreaks_vars = array (0,-1) []