Session,
defaultErrorHandler,
defaultCleanupHandler,
- init, initFromArgs,
newSession,
-- * Flags and settings
DynFlags(..), DynFlag(..), Severity(..), GhcMode(..), HscTarget(..), dopt,
parseDynamicFlags,
- initPackages,
getSessionDynFlags,
setSessionDynFlags,
TyCon,
tyConTyVars, tyConDataCons, tyConArity,
isClassTyCon, isSynTyCon, isNewTyCon, isPrimTyCon, isFunTyCon,
- synTyConDefn, synTyConRhs,
+ isOpenTyCon,
+ synTyConDefn, synTyConType, synTyConResKind,
-- ** Type variables
TyVar,
ToDo:
* inline bits of HscMain here to simplify layering: hscTcExpr, hscStmt.
- * we need to expose DynFlags, so should parseDynamicFlags really be
- part of this interface?
* what StaticFlags should we expose, if any?
-}
import Var ( TyVar )
import TysPrim ( alphaTyVars )
import TyCon ( TyCon, isClassTyCon, isSynTyCon, isNewTyCon,
- isPrimTyCon, isFunTyCon, tyConArity,
- tyConTyVars, tyConDataCons, synTyConDefn, synTyConRhs )
+ isPrimTyCon, isFunTyCon, isOpenTyCon, tyConArity,
+ tyConTyVars, tyConDataCons, synTyConDefn,
+ synTyConType, synTyConResKind )
import Class ( Class, classSCTheta, classTvsFds, classMethods )
import FunDeps ( pprFundeps )
import DataCon ( DataCon, dataConWrapId, dataConSig, dataConTyCon,
import FiniteMap
import Panic
import Digraph
-import Bag ( unitBag )
+import Bag ( unitBag, listToBag )
import ErrUtils ( Severity(..), showPass, fatalErrorMsg, debugTraceMsg,
- mkPlainErrMsg, printBagOfErrors )
+ mkPlainErrMsg, printBagOfErrors, printBagOfWarnings,
+ WarnMsg )
import qualified ErrUtils
import Util
import StringBuffer ( StringBuffer, hGetStringBuffer )
inner
--- | Initialises GHC. This must be done /once/ only. Takes the
--- TopDir path without the '-B' prefix.
-
-init :: Maybe String -> IO ()
-init mbMinusB = do
- -- catch ^C
- main_thread <- myThreadId
- putMVar interruptTargetThread [main_thread]
- installSignalHandlers
-
- dflags0 <- initSysTools mbMinusB defaultDynFlags
- writeIORef v_initDynFlags dflags0
-
--- | Initialises GHC. This must be done /once/ only. Takes the
--- command-line arguments. All command-line arguments which aren't
--- understood by GHC will be returned.
-
-initFromArgs :: [String] -> IO [String]
-initFromArgs args
- = do init mbMinusB
- return argv1
- where -- Grab the -B option if there is one
- (minusB_args, argv1) = partition (prefixMatch "-B") args
- mbMinusB | null minusB_args
- = Nothing
- | otherwise
- = Just (drop 2 (last minusB_args))
-
-GLOBAL_VAR(v_initDynFlags, error "initDynFlags", DynFlags)
- -- stores the DynFlags between the call to init and subsequent
- -- calls to newSession.
-
-- | Starts a new session. A session consists of a set of loaded
-- modules, a set of options (DynFlags), and an interactive context.
-- ToDo: GhcMode should say "keep typechecked code" and\/or "keep renamed
-- code".
-newSession :: GhcMode -> IO Session
-newSession mode = do
- dflags0 <- readIORef v_initDynFlags
- dflags <- initDynFlags dflags0
+newSession :: GhcMode -> Maybe FilePath -> IO Session
+newSession mode mb_top_dir = do
+ -- catch ^C
+ main_thread <- myThreadId
+ putMVar interruptTargetThread [main_thread]
+ installSignalHandlers
+
+ dflags0 <- initSysTools mb_top_dir defaultDynFlags
+ dflags <- initDynFlags dflags0
env <- newHscEnv dflags{ ghcMode=mode }
ref <- newIORef env
return (Session ref)
getSessionDynFlags :: Session -> IO DynFlags
getSessionDynFlags s = withSession s (return . hsc_dflags)
--- | Updates the DynFlags in a Session
-setSessionDynFlags :: Session -> DynFlags -> IO ()
-setSessionDynFlags s dflags = modifySession s (\h -> h{ hsc_dflags = dflags })
+-- | Updates the DynFlags in a Session. This also reads
+-- the package database (unless it has already been read),
+-- and prepares the compilers knowledge about packages. It
+-- can be called again to load new packages: just add new
+-- package flags to (packageFlags dflags).
+--
+-- Returns a list of new packages that may need to be linked in using
+-- the dynamic linker (see 'linkPackages') as a result of new package
+-- flags. If you are not doing linking or doing static linking, you
+-- can ignore the list of packages returned.
+--
+setSessionDynFlags :: Session -> DynFlags -> IO [PackageId]
+setSessionDynFlags (Session ref) dflags = do
+ hsc_env <- readIORef ref
+ (dflags', preload) <- initPackages dflags
+ writeIORef ref $! hsc_env{ hsc_dflags = dflags' }
+ return preload
-- | If there is no -o option, guess the name of target executable
-- by using top-level source file name as a base.
let mg2_with_srcimps :: [SCC ModSummary]
mg2_with_srcimps = topSortModuleGraph True mod_graph Nothing
+ -- If we can determine that any of the {-# SOURCE #-} imports
+ -- are definitely unnecessary, then emit a warning.
+ warnUnnecessarySourceImports dflags mg2_with_srcimps
+
+ let
-- check the stability property for each module.
stable_mods@(stable_obj,stable_bco)
| BatchCompile <- ghci_mode = ([],[])
-- We use integers as the keys for the SCC algorithm
nodes :: [(ModSummary, Int, [Int])]
- nodes = [(s, expectJust "topSort" (lookup_key (ms_hsc_src s) (ms_mod_name s)),
+ nodes = [(s, expectJust "topSort" $
+ lookup_key (ms_hsc_src s) (ms_mod_name s),
out_edge_keys hs_boot_key (map unLoc (ms_srcimps s)) ++
- out_edge_keys HsSrcFile (map unLoc (ms_imps s)) )
+ out_edge_keys HsSrcFile (map unLoc (ms_imps s)) ++
+ (-- see [boot-edges] below
+ if drop_hs_boot_nodes || ms_hsc_src s == HsBootFile
+ then []
+ else case lookup_key HsBootFile (ms_mod_name s) of
+ Nothing -> []
+ Just k -> [k])
+ )
| s <- summaries
, not (isBootSummary s && drop_hs_boot_nodes) ]
-- Drop the hi-boot ones if told to do so
+ -- [boot-edges] if this is a .hs and there is an equivalent
+ -- .hs-boot, add a link from the former to the latter. This
+ -- has the effect of detecting bogus cases where the .hs-boot
+ -- depends on the .hs, by introducing a cycle. Additionally,
+ -- it ensures that we will always process the .hs-boot before
+ -- the .hs, and so the HomePackageTable will always have the
+ -- most up to date information.
+
key_map :: NodeMap Int
key_map = listToFM ([(moduleName (ms_mod s), ms_hsc_src s)
| s <- summaries]
ms_mod_name :: ModSummary -> ModuleName
ms_mod_name = moduleName . ms_mod
+-- If there are {-# SOURCE #-} imports between strongly connected
+-- components in the topological sort, then those imports can
+-- definitely be replaced by ordinary non-SOURCE imports: if SOURCE
+-- were necessary, then the edge would be part of a cycle.
+warnUnnecessarySourceImports :: DynFlags -> [SCC ModSummary] -> IO ()
+warnUnnecessarySourceImports dflags sccs =
+ printBagOfWarnings dflags (listToBag (concat (map (check.flattenSCC) sccs)))
+ where check ms =
+ let mods_in_this_cycle = map ms_mod_name ms in
+ [ warn m i | m <- ms, i <- ms_srcimps m,
+ unLoc i `notElem` mods_in_this_cycle ]
+
+ warn :: ModSummary -> Located ModuleName -> WarnMsg
+ warn ms (L loc mod) =
+ mkPlainErrMsg loc
+ (ptext SLIT("Warning: {-# SOURCE #-} unnecessary in import of ")
+ <+> quotes (ppr mod))
+
-----------------------------------------------------------------------------
-- Downsweep (dependency analysis)
projects / ghc-hetmet.git / blobdiff