\begin{code}
module CmLink ( Linkable(..), Unlinked(..),
filterModuleLinkables,
- modname_of_linkable, is_package_linkable,
+ findModuleLinkable_maybe,
LinkResult(..),
link,
- PersistentLinkerState{-abstractly!-}, emptyPLS )
-where
+ unload,
+ PersistentLinkerState{-abstractly!-}, emptyPLS,
+#ifdef GHCI
+ linkExpr
+#endif
+ ) where
import Interpreter
-import CmStaticInfo ( PackageConfigInfo )
-import Module ( ModuleName, PackageName )
+import DriverPipeline
+import CmTypes
+import CmStaticInfo ( GhciMode(..) )
import Outputable ( SDoc )
-import Digraph ( SCC(..), flattenSCC, flattenSCCs )
+import Digraph ( SCC(..), flattenSCC )
+import Module ( ModuleName )
+import FiniteMap
import Outputable
-import Panic ( panic )
+import ErrUtils ( showPass )
+import CmdLineOpts ( DynFlags(..) )
+import Panic ( panic, GhcException(..) )
+
+import Exception
+import List
+import Monad
+import IO
#include "HsVersions.h"
\end{code}
data PersistentLinkerState
= PersistentLinkerState {
+
#ifdef GHCI
-- Current global mapping from RdrNames to closure addresses
closure_env :: ClosureEnv,
-- When a new Unlinked is linked into the running image, or an existing
-- module in the image is replaced, the itbl_env must be updated
-- appropriately.
- itbl_env :: ItblEnv
+ itbl_env :: ItblEnv,
+
+ -- list of objects we've loaded (we'll need to unload them again
+ -- before re-loading the same module), together with the ClockTime
+ -- of the linkable they were loaded from.
+ objects_loaded :: [Linkable]
-- notionally here, but really lives in the C part of the linker:
-- object_symtab :: FiniteMap String Addr
= LinkOK PersistentLinkerState
| LinkErrs PersistentLinkerState [SDoc]
-data Unlinked
- = DotO FilePath
- | DotA FilePath
- | DotDLL FilePath
- | Trees [UnlinkedIBind] ItblEnv -- bunch of interpretable bindings, +
- -- a mapping from DataCons to their itbls
-
-instance Outputable Unlinked where
- ppr (DotO path) = text "DotO" <+> text path
- ppr (DotA path) = text "DotA" <+> text path
- ppr (DotDLL path) = text "DotDLL" <+> text path
- ppr (Trees binds _) = text "Trees" <+> ppr binds
-
-
-isObject (DotO _) = True
-isObject (DotA _) = True
-isObject (DotDLL _) = True
-isObject _ = False
-
-nameOfObject (DotO fn) = fn
-nameOfObject (DotA fn) = fn
-nameOfObject (DotDLL fn) = fn
-
-isInterpretable (Trees _ _) = True
-isInterpretable _ = False
+findModuleLinkable_maybe :: [Linkable] -> ModuleName -> Maybe Linkable
+findModuleLinkable_maybe lis mod
+ = case [LM time nm us | LM time nm us <- lis, nm == mod] of
+ [] -> Nothing
+ [li] -> Just li
+ many -> pprPanic "findModuleLinkable" (ppr mod)
-data Linkable
- = LM ModuleName [Unlinked]
- | LP PackageName
-
-instance Outputable Linkable where
- ppr (LM mod_nm unlinkeds) = text "LinkableM" <+> ppr mod_nm <+> ppr unlinkeds
- ppr (LP package_nm) = text "LinkableP" <+> ptext package_nm
emptyPLS :: IO PersistentLinkerState
#ifdef GHCI
emptyPLS = return (PersistentLinkerState { closure_env = emptyFM,
- itbl_env = emptyFM })
+ itbl_env = emptyFM,
+ objects_loaded = [] })
#else
emptyPLS = return (PersistentLinkerState {})
#endif
-\end{code}
-\begin{code}
--- The first arg is supposed to be DriverPipeline.doLink.
--- Passed in here to avoid a hard-to-avoid circular dependency
--- between CmLink and DriverPipeline. Same deal as with
--- CmSummarise.summarise.
-link :: ([String] -> IO ())
- -> Bool -- was the upsweep completely successful?
- -> PackageConfigInfo
- -> [SCC Linkable]
+-----------------------------------------------------------------------------
+-- Unloading old objects ready for a new compilation sweep.
+--
+-- The compilation manager provides us with a list of linkables that it
+-- considers "stable", i.e. won't be recompiled this time around. For
+-- each of the modules current linked in memory,
+--
+-- * if the linkable is stable (and it's the same one - the
+-- user may have recompiled the module on the side), we keep it,
+--
+-- * otherwise, we unload it.
+--
+
+unload :: GhciMode
+ -> DynFlags
+ -> [Linkable] -- stable linkables
+ -> PersistentLinkerState
+ -> IO PersistentLinkerState
+
+unload Batch dflags linkables pls = return pls
+unload Interactive dflags linkables pls
+ = do new_loaded <- filterM maybeUnload (objects_loaded pls)
+ let mods_retained = map linkableModName new_loaded
+ itbl_env' = filterNameMap mods_retained (itbl_env pls)
+ closure_env' = filterNameMap mods_retained (closure_env pls)
+
+ let verb = verbosity dflags
+ when (verb >= 3) $ do
+ hPutStrLn stderr (showSDoc
+ (text "CmLink.unload: retaining" <+> ppr mods_retained))
+
+ return pls{ objects_loaded = new_loaded,
+ itbl_env = itbl_env',
+ closure_env = closure_env' }
+ where
+ maybeUnload :: Linkable -> IO Bool
+ maybeUnload (LM time mod objs) = do
+ case findModuleLinkable_maybe linkables mod of
+ Nothing -> do unloadObjs; return False
+ Just l | linkableTime l /= time -> do unloadObjs; return False
+ | otherwise -> return True
+ where
+ unloadObjs = mapM unloadObj [ f | DotO f <- objs ]
+
+-----------------------------------------------------------------------------
+-- Linking
+
+link :: GhciMode -- interactive or batch
+ -> DynFlags -- dynamic flags
+ -> Bool -- attempt linking in batch mode?
+ -> [Linkable]
-> PersistentLinkerState
-> IO LinkResult
-#ifndef GHCI_NOTYET
---link = panic "CmLink.link: not implemented"
-
--- For the moment, in the batch linker, we don't bother to
--- tell doLink which packages to link -- it just tries all that
--- are available.
-link doLink upsweep_complete_success pci groups pls1
- | upsweep_complete_success
- = do putStrLn "Hello from the Linker!"
- putStrLn (showSDoc (vcat (map ppLinkableSCC groups)))
- let o_files = concatMap getOfiles (flattenSCCs groups)
+-- For the moment, in the batch linker, we don't bother to tell doLink
+-- which packages to link -- it just tries all that are available.
+-- batch_attempt_linking should only be *looked at* in batch mode. It
+-- should only be True if the upsweep was successful and someone
+-- exports main, i.e., we have good reason to believe that linking
+-- will succeed.
+
+-- There will be (ToDo: are) two lists passed to link. These
+-- correspond to
+--
+-- 1. The list of all linkables in the current home package. This is
+-- used by the batch linker to link the program, and by the interactive
+-- linker to decide which modules from the previous link it can
+-- throw away.
+-- 2. The list of modules on which we just called "compile". This list
+-- is used by the interactive linker to decide which modules need
+-- to be actually linked this time around (or unlinked and re-linked
+-- if the module was recompiled).
+
+link mode dflags batch_attempt_linking linkables pls1
+ = do let verb = verbosity dflags
+ when (verb >= 3) $ do
+ hPutStrLn stderr "CmLink.link: linkables are ..."
+ hPutStrLn stderr (showSDoc (vcat (map ppr linkables)))
+ res <- link' mode dflags batch_attempt_linking linkables pls1
+ when (verb >= 3) $
+ hPutStrLn stderr "CmLink.link: done"
+ return res
+
+link' Batch dflags batch_attempt_linking linkables pls1
+ | batch_attempt_linking
+ = do let o_files = concatMap getOfiles linkables
+ when (verb >= 1) $
+ hPutStrLn stderr "ghc: linking ..."
+ -- don't showPass in Batch mode; doLink will do that for us.
doLink o_files
- putStrLn "Bye-bye from the Linker!"
+ -- doLink only returns if it succeeds
return (LinkOK pls1)
| otherwise
- = do putStrLn "LINKER: upsweep (partially?) failed; not doing batch linking"
+ = do when (verb >= 3) $ do
+ hPutStrLn stderr "CmLink.link(batch): upsweep (partially) failed OR"
+ hPutStrLn stderr " Main.main not exported; not linking."
return (LinkOK pls1)
where
- getOfiles (LP _) = []
- getOfiles (LM _ us) = map nameOfObject (filter isObject us)
+ verb = verbosity dflags
+ getOfiles (LM _ _ us) = map nameOfObject (filter isObject us)
-
+link' Interactive dflags batch_attempt_linking linkables pls
+ = do showPass dflags "Linking"
+ let (objs, bcos) = partition (isObject.head.linkableUnlinked) linkables
+ linkObjs (objs ++ bcos) pls
+ -- get the objects first
ppLinkableSCC :: SCC Linkable -> SDoc
ppLinkableSCC = ppr . flattenSCC
+filterModuleLinkables :: (ModuleName -> Bool) -> [Linkable] -> [Linkable]
+filterModuleLinkables p [] = []
+filterModuleLinkables p (li:lis)
+ = case li of
+ LM _ modnm _ -> if p modnm then retain else dump
+ where
+ dump = filterModuleLinkables p lis
+ retain = li : dump
+
+-----------------------------------------------------------------------------
+-- Linker for interactive mode
+
+#ifndef GHCI
+linkObjs = panic "CmLink.linkObjs: no interpreter"
+unload = panic "CmLink.unload: no interpreter"
+lookupClosure = panic "CmLink.lookupClosure: no interpreter"
#else
+linkObjs [] pls = linkFinish pls []
+linkObjs (l@(LM _ m uls) : ls) pls
+ | all isObject uls = do
+ if isLoaded l pls then linkObjs ls pls else do
+ let objs = [ file | DotO file <- uls ]
+ mapM_ loadObj objs
+ linkObjs ls pls{objects_loaded = l : objects_loaded pls}
+ | all isInterpretable uls = linkInterpretedCode (l:ls) [] pls
+ | otherwise = invalidLinkable
+isLoaded :: Linkable -> PersistentLinkerState -> Bool
+isLoaded l pls =
+ case findModuleLinkable_maybe (objects_loaded pls) (linkableModName l) of
+ Nothing -> False
+ Just m -> linkableTime l == linkableTime m
+
+linkInterpretedCode [] ul_trees pls = linkFinish pls ul_trees
+linkInterpretedCode (l@(LM _ m uls) : ls) ul_trees pls
+ | all isInterpretable uls =
+ if isLoaded l pls then linkInterpretedCode ls ul_trees pls else
+ linkInterpretedCode ls (uls++ul_trees)
+ pls{objects_loaded = l : objects_loaded pls}
+ | any isObject uls
+ = throwDyn (OtherError
+ "can't link object code that depends on interpreted code")
+ | otherwise = invalidLinkable
-link pci [] pls = return (LinkOK pls)
-link pci (groupSCC:groups) pls = do
- let group = flattenSCC groupSCC
- -- the group is either all objects or all interpretable, for now
- if all isObject group
- then do mapM loadObj [ file | DotO file <- group ]
- resolveObjs
- link pci groups pls
- else if all isInterpretable group
- then do (new_closure_env, new_itbl_env) <-
- linkIModules (closure_env pls)
- (itbl_env pls)
- [ trees | Trees trees <- group ]
- link pci groups (PersistentLinkerState{
- closure_env=new_closure_env,
- itbl_env=new_itbl_env})
- else
- return (LinkErrs pls (ptext SLIT("linker: group must contain all objects or all interpreted modules")))
-#endif
+invalidLinkable = panic "CmLink: linkable doesn't contain entirely objects or interpreted code"
-modname_of_linkable (LM nm _) = nm
-modname_of_linkable (LP _) = panic "modname_of_linkable: package"
+-- link all the interpreted code in one go.
+linkFinish pls ul_bcos = do
+ resolveObjs
-is_package_linkable (LP _) = True
-is_package_linkable (LM _ _) = False
+ let stuff = [ (bcos,itbls) | BCOs bcos itbls <- ul_bcos ]
-filterModuleLinkables :: (ModuleName -> Bool)
- -> [Linkable]
- -> [Linkable]
-filterModuleLinkables p [] = []
-filterModuleLinkables p (li:lis)
- = case li of
- LP _ -> retain
- LM modnm _ -> if p modnm then retain else dump
- where
- dump = filterModuleLinkables p lis
- retain = li : dump
+ (ibinds, new_itbl_env, new_closure_env) <-
+ linkIModules (itbl_env pls) (closure_env pls) stuff
+
+ let new_pls = pls { closure_env = new_closure_env,
+ itbl_env = new_itbl_env
+ }
+ return (LinkOK new_pls)
+
+linkExpr :: PersistentLinkerState -> UnlinkedBCOExpr -> IO HValue
+linkExpr PersistentLinkerState{ itbl_env = ie, closure_env = ce } bcos
+ = linkIExpr ie ce bcos
+#endif
\end{code}
projects / ghc-hetmet.git / blobdiff