\section[CompManager]{The Compilation Manager}
\begin{code}
+{-# OPTIONS -fvia-C #-}
module CompManager (
cmInit, -- :: GhciMode -> IO CmState
#ifdef GHCI
cmInfoThing, -- :: CmState -> DynFlags -> String -> IO (Maybe TyThing)
- cmRunStmt, -- :: CmState -> DynFlags -> String -> IO (CmState, [Name])
+ CmRunResult(..),
+ cmRunStmt, -- :: CmState -> DynFlags -> String -> IO (CmState, CmRunResult)
cmTypeOfExpr, -- :: CmState -> DynFlags -> String
-- -> IO (CmState, Maybe String)
import CmTypes
import DriverPipeline
import DriverFlags ( getDynFlags )
+import DriverState ( v_Output_file )
import DriverPhases
import DriverUtil
import Finder
import HscMain ( initPersistentCompilerState )
#endif
import HscTypes
-import RnEnv ( unQualInScope )
-import Id ( idType, idName )
import Name ( Name, NamedThing(..), nameRdrName, nameModule,
isHomePackageName )
-import NameEnv
import RdrName ( lookupRdrEnv, emptyRdrEnv )
import Module
import GetImports
-import Type ( tidyType )
-import VarEnv ( emptyTidyEnv )
import UniqFM
import Unique ( Uniquable )
import Digraph ( SCC(..), stronglyConnComp, flattenSCC, flattenSCCs )
import SysTools ( cleanTempFilesExcept )
import Util
import Outputable
-import BasicTypes ( Fixity, defaultFixity )
import Panic
import CmdLineOpts ( DynFlags(..) )
import IOExts
#ifdef GHCI
+import Id ( idType, idName )
+import NameEnv
+import Type ( tidyType )
+import VarEnv ( emptyTidyEnv )
+import RnEnv ( unQualInScope )
+import BasicTypes ( Fixity, defaultFixity )
import Interpreter ( HValue )
import HscMain ( hscStmt )
import PrelGHC ( unsafeCoerce# )
+
+import Foreign
+import CForeign
+import Exception ( Exception, try )
#endif
-- lang
-- cmRunStmt: Run a statement/expr.
#ifdef GHCI
-cmRunStmt :: CmState -> DynFlags -> String
- -> IO (CmState, -- new state
- [Name]) -- names bound by this evaluation
-cmRunStmt cmstate dflags expr
+data CmRunResult
+ = CmRunOk [Name] -- names bound by this evaluation
+ | CmRunFailed
+ | CmRunDeadlocked -- statement deadlocked
+ | CmRunException Exception -- statement raised an exception
+
+cmRunStmt :: CmState -> DynFlags -> String -> IO (CmState, CmRunResult)
+cmRunStmt cmstate@CmState{ hst=hst, hit=hit, pcs=pcs, pls=pls, ic=icontext }
+ dflags expr
= do
let InteractiveContext {
ic_rn_env = rn_env,
<- hscStmt dflags hst hit pcs icontext expr False{-stmt-}
case maybe_stuff of
- Nothing -> return (cmstate{ pcs=new_pcs }, [])
+ Nothing -> return (cmstate{ pcs=new_pcs }, CmRunFailed)
Just (ids, _, bcos) -> do
-- update the interactive context
-- run it!
let thing_to_run = unsafeCoerce# hval :: IO [HValue]
- hvals <- thing_to_run
-
- -- Get the newly bound things, and bind them. Don't forget
- -- to delete any shadowed bindings from the closure_env, lest
- -- we end up with a space leak.
- pls <- delListFromClosureEnv pls shadowed
- new_pls <- addListToClosureEnv pls (zip names hvals)
-
- return (cmstate{ pcs=new_pcs, pls=new_pls, ic=new_ic }, names)
- where
- CmState{ hst=hst, hit=hit, pcs=pcs, pls=pls, ic=icontext } = cmstate
+ either_hvals <- sandboxIO thing_to_run
+ case either_hvals of
+ Left err
+ | err == dEADLOCKED
+ -> return ( cmstate{ pcs=new_pcs, ic=new_ic },
+ CmRunDeadlocked )
+ | otherwise
+ -> do hPutStrLn stderr ("unknown failure, code " ++ show err)
+ return ( cmstate{ pcs=new_pcs, ic=new_ic }, CmRunFailed )
+
+ Right maybe_hvals ->
+ case maybe_hvals of
+ Left e ->
+ return ( cmstate{ pcs=new_pcs, ic=new_ic },
+ CmRunException e )
+ Right hvals -> do
+ -- Get the newly bound things, and bind them.
+ -- Don't forget to delete any shadowed bindings from the
+ -- closure_env, lest we end up with a space leak.
+ pls <- delListFromClosureEnv pls shadowed
+ new_pls <- addListToClosureEnv pls (zip names hvals)
+
+ return (cmstate{ pcs=new_pcs, pls=new_pls, ic=new_ic },
+ CmRunOk names)
+
+-- We run the statement in a "sandbox", which amounts to calling into
+-- the RTS to request a new main thread. The main benefit is that we
+-- get to detect a deadlock this way, but also there's no danger that
+-- exceptions raised by the expression can affect the interpreter.
+
+sandboxIO :: IO a -> IO (Either Int (Either Exception a))
+sandboxIO thing = do
+ st_thing <- newStablePtr (Exception.try thing)
+ alloca $ \ p_st_result -> do
+ stat <- rts_evalStableIO st_thing p_st_result
+ freeStablePtr st_thing
+ if stat == 1
+ then do st_result <- peek p_st_result
+ result <- deRefStablePtr st_result
+ freeStablePtr st_result
+ return (Right result)
+ else do
+ return (Left (fromIntegral stat))
+
+-- ToDo: slurp this in from ghc/includes/RtsAPI.h somehow
+dEADLOCKED = 4 :: Int
+
+foreign import "rts_evalStableIO" {- safe -}
+ rts_evalStableIO :: StablePtr (IO a) -> Ptr (StablePtr a) -> IO CInt
+ -- more informative than the C type!
#endif
-----------------------------------------------------------------------------
tidy_ty = tidyType emptyTidyEnv ty
where
CmState{ hst=hst, hit=hit, pcs=pcs, ic=ic } = cmstate
-#endif
getUnqual pcs hit ic
= case lookupIfaceByModName hit pit modname of
where
pit = pcs_PIT pcs
modname = moduleName (ic_module ic)
+#endif
-----------------------------------------------------------------------------
-- cmTypeOfName: returns a string representing the type of a name.
#endif
-----------------------------------------------------------------------------
--- cmInfo: return "info" about an expression. The info might be:
---
--- * its type, for an expression,
--- * the class definition, for a class
--- * the datatype definition, for a tycon (or synonym)
--- * the export list, for a module
---
--- Can be used to find the type of the last expression compiled, by looking
--- for "it".
-
-cmInfo :: CmState -> String -> IO (Maybe String)
-cmInfo cmstate str
- = do error "cmInfo not implemented yet"
-
------------------------------------------------------------------------------
-- Unload the compilation manager's state: everything it knows about the
-- current collection of modules in the Home package.
-- the previous pass, if any.
let ui1 = ui cmstate1
let mg1 = mg cmstate1
- let ic1 = ic cmstate1
let ghci_mode = gmode cmstate1 -- this never changes
-- clean up after ourselves
cleanTempFilesExcept verb (ppFilesFromSummaries modsDone)
+ -- issue a warning for the confusing case where the user said '-o foo'
+ -- but we're not going to do any linking.
+ ofile <- readIORef v_Output_file
+ when (ghci_mode == Batch && isJust ofile && not a_root_is_Main
+ && verb > 0) $
+ hPutStrLn stderr "Warning: output was redirected with -o, but no output will be generated\nbecause there is no Main module."
+
-- link everything together
linkresult <- link ghci_mode dflags a_root_is_Main ui3 pls2
upsweep_mod ghci_mode dflags oldUI threaded1 summary1 reachable_inc_me
= do
let mod_name = name_of_summary summary1
- let verb = verbosity dflags
let (CmThreaded pcs1 hst1 hit1) = threaded1
let old_iface = lookupUFM hit1 mod_name
= do hspp_fn <- preprocess file
(srcimps,imps,mod_name) <- getImportsFromFile hspp_fn
- let (path, basename, ext) = splitFilename3 file
+ let (path, basename, _ext) = splitFilename3 file
(mod, location)
<- mkHomeModuleLocn mod_name (path ++ '/':basename) file
projects / ghc-hetmet.git / blobdiff