%
-% (c) The University of Glasgow, 2000
+% (c) The University of Glasgow, 2002
+%
+% The Compilation Manager
%
-\section[CompManager]{The Compilation Manager}
-
\begin{code}
-module CompManager ( cmInit, cmLoadModule, cmUnload,
+{-# OPTIONS -fvia-C #-}
+module CompManager (
+ ModuleGraph,
+
+ CmState, emptyCmState, -- abstract
+
+ cmInit, -- :: GhciMode -> IO CmState
+
+ cmDepAnal, -- :: CmState -> DynFlags -> [FilePath] -> IO ModuleGraph
+
+ cmLoadModules, -- :: CmState -> DynFlags -> ModuleGraph
+ -- -> IO (CmState, [String])
+
+ cmUnload, -- :: CmState -> DynFlags -> IO CmState
+
#ifdef GHCI
- cmGetExpr, cmRunExpr,
+ cmModuleIsInterpreted, -- :: CmState -> String -> IO Bool
+
+ cmSetContext, -- :: CmState -> DynFlags -> [String] -> [String] -> IO CmState
+ cmGetContext, -- :: CmState -> IO ([String],[String])
+
+ cmInfoThing, -- :: CmState -> DynFlags -> String
+ -- -> IO (CmState, [(TyThing,Fixity)])
+
+ cmBrowseModule, -- :: CmState -> IO [TyThing]
+
+ CmRunResult(..),
+ cmRunStmt, -- :: CmState -> DynFlags -> String
+ -- -> IO (CmState, CmRunResult)
+
+ cmTypeOfExpr, -- :: CmState -> DynFlags -> String
+ -- -> IO (CmState, Maybe String)
+
+ cmTypeOfName, -- :: CmState -> Name -> IO (Maybe String)
+
+ HValue,
+ cmCompileExpr, -- :: CmState -> DynFlags -> String
+ -- -> IO (CmState, Maybe HValue)
+
+ cmGetModuleGraph, -- :: CmState -> ModuleGraph
+ cmGetLinkables, -- :: CmState -> [Linkable]
+
+ cmGetBindings, -- :: CmState -> [TyThing]
+ cmGetPrintUnqual, -- :: CmState -> PrintUnqualified
#endif
- CmState, emptyCmState -- abstract
- )
+
+ -- utils
+ showModMsg, --
+ )
where
#include "HsVersions.h"
+import MkIface --tmp
+import HsSyn -- tmp
+
import CmLink
import CmTypes
-import HscTypes
-import Module ( ModuleName, moduleName,
- isHomeModule, moduleEnvElts,
- moduleNameUserString )
-import CmStaticInfo ( GhciMode(..) )
import DriverPipeline
-import GetImports
-import HscTypes ( HomeSymbolTable, HomeIfaceTable,
- PersistentCompilerState, ModDetails(..) )
-import Name ( lookupNameEnv )
-import Module
-import PrelNames ( mainName )
-import HscMain ( initPersistentCompilerState )
+import DriverState ( v_Output_file )
+import DriverPhases
+import DriverUtil
import Finder
-import UniqFM ( emptyUFM, lookupUFM, addToUFM, delListFromUFM,
- UniqFM, listToUFM, eltsUFM )
+#ifdef GHCI
+import HscMain ( initPersistentCompilerState, hscThing,
+ hscModuleContents )
+#else
+import HscMain ( initPersistentCompilerState )
+#endif
+import HscTypes
+import Name ( Name, NamedThing(..), nameRdrName, nameModule,
+ isHomePackageName, isGlobalName )
+import NameEnv
+import Rename ( mkGlobalContext )
+import RdrName ( emptyRdrEnv )
+import Module
+import GetImports
+import UniqFM
import Unique ( Uniquable )
-import Digraph ( SCC(..), stronglyConnComp, flattenSCC )
-import DriverFlags ( getDynFlags )
-import DriverPhases
-import DriverUtil ( BarfKind(..), splitFilename3 )
+import Digraph ( SCC(..), stronglyConnComp, flattenSCC, flattenSCCs )
import ErrUtils ( showPass )
+import SysTools ( cleanTempFilesExcept )
import Util
-import DriverUtil
import Outputable
-import Panic ( panic )
-import CmdLineOpts ( DynFlags(..) )
+import Panic
+import CmdLineOpts ( DynFlags(..), getDynFlags )
+
+import IOExts
#ifdef GHCI
+import RdrName ( lookupRdrEnv )
+import Id ( idType, idName )
+import Type ( tidyType )
+import VarEnv ( emptyTidyEnv )
+import BasicTypes ( Fixity, defaultFixity )
import Interpreter ( HValue )
-import HscMain ( hscExpr )
-import Type ( Type )
-import PrelGHC ( unsafeCoerce# )
+import HscMain ( hscStmt )
+import GlaExts ( unsafeCoerce# )
+import Foreign
+import CForeign
+import Exception ( Exception, try )
#endif
-- lang
import Exception ( throwDyn )
-- std
-import Time ( ClockTime )
import Directory ( getModificationTime, doesFileExist )
import IO
import Monad
import List ( nub )
-import Maybe ( catMaybes, fromMaybe, isJust, maybeToList )
+import Maybe
\end{code}
\begin{code}
-cmInit :: GhciMode -> IO CmState
-cmInit gmode
- = emptyCmState gmode
-
-#ifdef GHCI
-cmGetExpr :: CmState
- -> DynFlags
- -> ModuleName
- -> String
- -> IO (CmState, Maybe (HValue, PrintUnqualified, Type))
-cmGetExpr cmstate dflags modname expr
- = do (new_pcs, maybe_stuff) <-
- hscExpr dflags hst hit pcs (mkHomeModule modname) expr
- case maybe_stuff of
- Nothing -> return (cmstate{ pcs=new_pcs }, Nothing)
- Just (uiexpr, print_unqual, ty) -> do
- hValue <- linkExpr pls uiexpr
- return (cmstate{ pcs=new_pcs },
- Just (hValue, print_unqual, ty))
-
- -- ToDo: check that the module we passed in is sane/exists?
- where
- CmState{ pcs=pcs, pcms=pcms, pls=pls } = cmstate
- PersistentCMState{ hst=hst, hit=hit } = pcms
-
--- The HValue should represent a value of type IO () (Perhaps IO a?)
-cmRunExpr :: HValue -> IO ()
-cmRunExpr hval
- = do unsafeCoerce# hval :: IO ()
- -- putStrLn "done."
-#endif
-
--- Persistent state just for CM, excluding link & compile subsystems
-data PersistentCMState
- = PersistentCMState {
+-- Persistent state for the entire system
+data CmState
+ = CmState {
hst :: HomeSymbolTable, -- home symbol table
hit :: HomeIfaceTable, -- home interface table
ui :: UnlinkedImage, -- the unlinked images
mg :: ModuleGraph, -- the module graph
- gmode :: GhciMode -- NEVER CHANGES
- }
-
-emptyPCMS :: GhciMode -> PersistentCMState
-emptyPCMS gmode
- = PersistentCMState { hst = emptyHST, hit = emptyHIT,
- ui = emptyUI, mg = emptyMG,
- gmode = gmode }
-
-emptyHIT :: HomeIfaceTable
-emptyHIT = emptyUFM
-emptyHST :: HomeSymbolTable
-emptyHST = emptyUFM
-
+ gmode :: GhciMode, -- NEVER CHANGES
+ ic :: InteractiveContext, -- command-line binding info
-
--- Persistent state for the entire system
-data CmState
- = CmState {
- pcms :: PersistentCMState, -- CM's persistent state
pcs :: PersistentCompilerState, -- compile's persistent state
pls :: PersistentLinkerState -- link's persistent state
}
emptyCmState :: GhciMode -> IO CmState
emptyCmState gmode
- = do let pcms = emptyPCMS gmode
- pcs <- initPersistentCompilerState
+ = do pcs <- initPersistentCompilerState
pls <- emptyPLS
- return (CmState { pcms = pcms,
+ return (CmState { hst = emptySymbolTable,
+ hit = emptyIfaceTable,
+ ui = emptyUI,
+ mg = emptyMG,
+ gmode = gmode,
+ ic = emptyInteractiveContext,
pcs = pcs,
pls = pls })
+emptyInteractiveContext
+ = InteractiveContext { ic_toplev_scope = [],
+ ic_exports = [],
+ ic_rn_gbl_env = emptyRdrEnv,
+ ic_print_unqual = alwaysQualify,
+ ic_rn_local_env = emptyRdrEnv,
+ ic_type_env = emptyTypeEnv }
+
-- CM internal types
type UnlinkedImage = [Linkable] -- the unlinked images (should be a set, really)
emptyUI :: UnlinkedImage
emptyMG :: ModuleGraph
emptyMG = []
-\end{code}
+-----------------------------------------------------------------------------
+-- Produce an initial CmState.
-Unload the compilation manager's state: everything it knows about the
-current collection of modules in the Home package.
+cmInit :: GhciMode -> IO CmState
+cmInit mode = emptyCmState mode
-\begin{code}
-cmUnload :: CmState -> IO CmState
-cmUnload state
+-----------------------------------------------------------------------------
+-- Grab information from the CmState
+
+cmGetModuleGraph = mg
+cmGetLinkables = ui
+
+cmGetBindings cmstate = nameEnvElts (ic_type_env (ic cmstate))
+cmGetPrintUnqual cmstate = ic_print_unqual (ic cmstate)
+
+-----------------------------------------------------------------------------
+-- Setting the context doesn't throw away any bindings; the bindings
+-- we've built up in the InteractiveContext simply move to the new
+-- module. They always shadow anything in scope in the current context.
+
+cmSetContext
+ :: CmState -> DynFlags
+ -> [String] -- take the top-level scopes of these modules
+ -> [String] -- and the just the exports from these
+ -> IO CmState
+cmSetContext cmstate dflags toplevs exports = do
+ let CmState{ hit=hit, hst=hst, pcs=pcs, ic=old_ic } = cmstate
+
+ toplev_mods <- mapM (getTopLevModule hit) (map mkModuleName toplevs)
+ export_mods <- mapM (moduleNameToModule hit) (map mkModuleName exports)
+
+ (new_pcs, print_unqual, maybe_env)
+ <- mkGlobalContext dflags hit hst pcs toplev_mods export_mods
+
+ case maybe_env of
+ Nothing -> return cmstate
+ Just env -> return cmstate{ pcs = new_pcs,
+ ic = old_ic{ ic_toplev_scope = toplev_mods,
+ ic_exports = export_mods,
+ ic_rn_gbl_env = env,
+ ic_print_unqual = print_unqual } }
+
+getTopLevModule hit mn =
+ case lookupModuleEnvByName hit mn of
+ Just iface
+ | Just _ <- mi_globals iface -> return (mi_module iface)
+ _other -> throwDyn (CmdLineError (
+ "cannot enter the top-level scope of a compiled module (module `" ++
+ moduleNameUserString mn ++ "')"))
+
+moduleNameToModule :: HomeIfaceTable -> ModuleName -> IO Module
+moduleNameToModule hit mn = do
+ case lookupModuleEnvByName hit mn of
+ Just iface -> return (mi_module iface)
+ _not_a_home_module -> do
+ maybe_stuff <- findModule mn
+ case maybe_stuff of
+ Nothing -> throwDyn (CmdLineError ("can't find module `"
+ ++ moduleNameUserString mn ++ "'"))
+ Just (m,_) -> return m
+
+cmGetContext :: CmState -> IO ([String],[String])
+cmGetContext CmState{ic=ic} =
+ return (map moduleUserString (ic_toplev_scope ic),
+ map moduleUserString (ic_exports ic))
+
+cmModuleIsInterpreted :: CmState -> String -> IO Bool
+cmModuleIsInterpreted cmstate str
+ = case lookupModuleEnvByName (hit cmstate) (mkModuleName str) of
+ Just iface -> return (not (isNothing (mi_globals iface)))
+ _not_a_home_module -> return False
+
+-----------------------------------------------------------------------------
+-- cmInfoThing: convert a String to a TyThing
+
+-- A string may refer to more than one TyThing (eg. a constructor,
+-- and type constructor), so we return a list of all the possible TyThings.
+
+#ifdef GHCI
+cmInfoThing :: CmState -> DynFlags -> String -> IO (CmState, [(TyThing,Fixity)])
+cmInfoThing cmstate dflags id
+ = do (new_pcs, things) <- hscThing dflags hst hit pcs icontext id
+ let pairs = map (\x -> (x, getFixity new_pcs (getName x))) things
+ return (cmstate{ pcs=new_pcs }, pairs)
+ where
+ CmState{ hst=hst, hit=hit, pcs=pcs, pls=pls, ic=icontext } = cmstate
+
+ getFixity :: PersistentCompilerState -> Name -> Fixity
+ getFixity pcs name
+ | isGlobalName name,
+ Just iface <- lookupModuleEnv iface_table (nameModule name),
+ Just fixity <- lookupNameEnv (mi_fixities iface) name
+ = fixity
+ | otherwise
+ = defaultFixity
+ where iface_table | isHomePackageName name = hit
+ | otherwise = pcs_PIT pcs
+#endif
+
+-- ---------------------------------------------------------------------------
+-- cmBrowseModule: get all the TyThings defined in a module
+
+#ifdef GHCI
+cmBrowseModule :: CmState -> DynFlags -> String -> Bool
+ -> IO (CmState, [TyThing])
+cmBrowseModule cmstate dflags str exports_only = do
+ let mn = mkModuleName str
+ mod <- moduleNameToModule hit mn
+ (pcs1, maybe_ty_things)
+ <- hscModuleContents dflags hst hit pcs mod exports_only
+ case maybe_ty_things of
+ Nothing -> return (cmstate{pcs=pcs1}, [])
+ Just ty_things -> return (cmstate{pcs=pcs1}, ty_things)
+ where
+ CmState{ hst=hst, hit=hit, pcs=pcs, pls=pls, ic=icontext } = cmstate
+#endif
+
+-----------------------------------------------------------------------------
+-- cmRunStmt: Run a statement/expr.
+
+#ifdef GHCI
+data CmRunResult
+ = CmRunOk [Name] -- names bound by this evaluation
+ | CmRunFailed
+ | 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_local_env = rn_env,
+ ic_type_env = type_env } = icontext
+
+ (new_pcs, maybe_stuff)
+ <- hscStmt dflags hst hit pcs icontext expr False{-stmt-}
+
+ case maybe_stuff of
+ Nothing -> return (cmstate{ pcs=new_pcs }, CmRunFailed)
+ Just (ids, _, bcos) -> do
+
+ -- update the interactive context
+ let
+ names = map idName ids
+
+ -- these names have just been shadowed
+ shadowed = [ n | r <- map nameRdrName names,
+ Just n <- [lookupRdrEnv rn_env r] ]
+
+ new_rn_env = extendLocalRdrEnv rn_env names
+
+ -- remove any shadowed bindings from the type_env
+ filtered_type_env = delListFromNameEnv type_env shadowed
+
+ new_type_env = extendNameEnvList filtered_type_env
+ [ (getName id, AnId id) | id <- ids]
+
+ new_ic = icontext { ic_rn_local_env = new_rn_env,
+ ic_type_env = new_type_env }
+
+ -- link it
+ hval <- linkExpr pls bcos
+
+ -- run it!
+ let thing_to_run = unsafeCoerce# hval :: IO [HValue]
+ either_hvals <- sandboxIO thing_to_run
+ case either_hvals of
+ Left err
+ -> 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" to protect the rest of the
+-- system from anything the expression might do. For now, this
+-- consists of just wrapping it in an exception handler, but see below
+-- for another version.
+
+sandboxIO :: IO a -> IO (Either Int (Either Exception a))
+sandboxIO thing = do
+ r <- Exception.try thing
+ return (Right r)
+
+{-
+-- This version of sandboxIO runs the expression in a completely new
+-- RTS main thread. It is disabled for now because ^C exceptions
+-- won't be delivered to the new thread, instead they'll be delivered
+-- to the (blocked) GHCi main thread.
+
+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))
+
+foreign import "rts_evalStableIO" {- safe -}
+ rts_evalStableIO :: StablePtr (IO a) -> Ptr (StablePtr a) -> IO CInt
+ -- more informative than the C type!
+-}
+#endif
+
+-----------------------------------------------------------------------------
+-- cmTypeOfExpr: returns a string representing the type of an expression
+
+#ifdef GHCI
+cmTypeOfExpr :: CmState -> DynFlags -> String -> IO (CmState, Maybe String)
+cmTypeOfExpr cmstate dflags expr
+ = do (new_pcs, maybe_stuff)
+ <- hscStmt dflags hst hit pcs ic expr True{-just an expr-}
+
+ let new_cmstate = cmstate{pcs = new_pcs}
+
+ case maybe_stuff of
+ Nothing -> return (new_cmstate, Nothing)
+ Just (_, ty, _) -> return (new_cmstate, Just str)
+ where
+ str = showSDocForUser unqual (ppr tidy_ty)
+ unqual = ic_print_unqual ic
+ tidy_ty = tidyType emptyTidyEnv ty
+ where
+ CmState{ hst=hst, hit=hit, pcs=pcs, ic=ic } = cmstate
+#endif
+
+-----------------------------------------------------------------------------
+-- cmTypeOfName: returns a string representing the type of a name.
+
+#ifdef GHCI
+cmTypeOfName :: CmState -> Name -> IO (Maybe String)
+cmTypeOfName CmState{ hit=hit, pcs=pcs, ic=ic } name
+ = case lookupNameEnv (ic_type_env ic) name of
+ Nothing -> return Nothing
+ Just (AnId id) -> return (Just str)
+ where
+ unqual = ic_print_unqual ic
+ ty = tidyType emptyTidyEnv (idType id)
+ str = showSDocForUser unqual (ppr ty)
+
+ _ -> panic "cmTypeOfName"
+#endif
+
+-----------------------------------------------------------------------------
+-- cmCompileExpr: compile an expression and deliver an HValue
+
+#ifdef GHCI
+cmCompileExpr :: CmState -> DynFlags -> String -> IO (CmState, Maybe HValue)
+cmCompileExpr cmstate dflags expr
+ = do
+ let InteractiveContext {
+ ic_rn_local_env = rn_env,
+ ic_type_env = type_env } = icontext
+
+ (new_pcs, maybe_stuff)
+ <- hscStmt dflags hst hit pcs icontext
+ ("let __cmCompileExpr = "++expr) False{-stmt-}
+
+ case maybe_stuff of
+ Nothing -> return (cmstate{ pcs=new_pcs }, Nothing)
+ Just (ids, _, bcos) -> do
+
+ -- link it
+ hval <- linkExpr pls bcos
+
+ -- run it!
+ let thing_to_run = unsafeCoerce# hval :: IO [HValue]
+ hvals <- thing_to_run
+
+ case (ids,hvals) of
+ ([id],[hv]) -> return (cmstate{ pcs=new_pcs }, Just hv)
+ _ -> panic "cmCompileExpr"
+
+ where
+ CmState{ hst=hst, hit=hit, pcs=pcs, pls=pls, ic=icontext } = cmstate
+#endif
+
+-----------------------------------------------------------------------------
+-- Unload the compilation manager's state: everything it knows about the
+-- current collection of modules in the Home package.
+
+cmUnload :: CmState -> DynFlags -> IO CmState
+cmUnload state@CmState{ gmode=mode, pls=pls, pcs=pcs } dflags
= do -- Throw away the old home dir cache
emptyHomeDirCache
- -- Throw away the HIT and the HST
- return state{ pcms=pcms{ hst=new_hst, hit=new_hit } }
- where
- CmState{ pcms=pcms } = state
- PersistentCMState{ hst=hst, hit=hit } = pcms
- (new_hst, new_hit,[]) = retainInTopLevelEnvs [] (hst,hit,[])
-\end{code}
-The real business of the compilation manager: given a system state and
-a module name, try and bring the module up to date, probably changing
-the system state at the same time.
+ -- Unload everything the linker knows about
+ new_pls <- CmLink.unload mode dflags [] pls
-\begin{code}
-cmLoadModule :: CmState
- -> FilePath
+ -- Start with a fresh CmState, but keep the PersistentCompilerState
+ new_state <- cmInit mode
+ return new_state{ pcs=pcs, pls=new_pls }
+
+
+-----------------------------------------------------------------------------
+-- Trace dependency graph
+
+-- This is a seperate pass so that the caller can back off and keep
+-- the current state if the downsweep fails.
+
+cmDepAnal :: CmState -> DynFlags -> [FilePath] -> IO ModuleGraph
+cmDepAnal cmstate dflags rootnames
+ = do showPass dflags "Chasing dependencies"
+ when (verbosity dflags >= 1 && gmode cmstate == Batch) $
+ hPutStrLn stderr (showSDoc (hcat [
+ text progName, text ": chasing modules from: ",
+ hcat (punctuate comma (map text rootnames))]))
+ downsweep rootnames (mg cmstate)
+
+-----------------------------------------------------------------------------
+-- The real business of the compilation manager: given a system state and
+-- a module name, try and bring the module up to date, probably changing
+-- the system state at the same time.
+
+cmLoadModules :: CmState
+ -> DynFlags
+ -> ModuleGraph
-> IO (CmState, -- new state
Bool, -- was successful
- [ModuleName]) -- list of modules loaded
+ [String]) -- list of modules loaded
-cmLoadModule cmstate1 rootname
+cmLoadModules cmstate1 dflags mg2unsorted
= do -- version 1's are the original, before downsweep
- let pcms1 = pcms cmstate1
let pls1 = pls cmstate1
let pcs1 = pcs cmstate1
- -- mg1 is the complete (home) set of summaries from the
- -- previous pass of cmLoadModule, if there was one.
- let mg1 = mg pcms1
- let hst1 = hst pcms1
- let hit1 = hit pcms1
+ let hst1 = hst cmstate1
+ let hit1 = hit cmstate1
-- similarly, ui1 is the (complete) set of linkables from
-- the previous pass, if any.
- let ui1 = ui pcms1
-
- let ghci_mode = gmode pcms1 -- this never changes
+ let ui1 = ui cmstate1
- -- Do the downsweep to reestablish the module graph
- -- then generate version 2's by retaining in HIT,HST,UI a
- -- stable set S of modules, as defined below.
+ let ghci_mode = gmode cmstate1 -- this never changes
- dflags <- getDynFlags
+ -- Do the downsweep to reestablish the module graph
let verb = verbosity dflags
- showPass dflags "Chasing dependencies"
- when (verb >= 1 && ghci_mode == Batch) $
- hPutStrLn stderr (prog_name ++ ": chasing modules from: " ++ rootname)
+ -- Find out if we have a Main module
+ let a_root_is_Main
+ = any ((=="Main").moduleNameUserString.modSummaryName)
+ mg2unsorted
- (mg2unsorted, a_root_is_Main) <- downsweep [rootname]
- let mg2unsorted_names = map name_of_summary mg2unsorted
+ let mg2unsorted_names = map modSummaryName mg2unsorted
-- reachable_from follows source as well as normal imports
let reachable_from :: ModuleName -> [ModuleName]
reachable_from = downwards_closure_of_module mg2unsorted
-
+
-- should be cycle free; ignores 'import source's
let mg2 = topological_sort False mg2unsorted
-- ... whereas this takes them into account. Used for
-- not in strict downwards closure, during calls to compile.
let mg2_with_srcimps = topological_sort True mg2unsorted
+ -- Sort out which linkables we wish to keep in the unlinked image.
+ -- See getValidLinkables below for details.
+ (valid_old_linkables, new_linkables)
+ <- getValidLinkables ui1 mg2unsorted_names mg2_with_srcimps
+
+ -- putStrLn (showSDoc (vcat [ppr valid_old_linkables, ppr new_linkables]))
+
+ -- uniq of ModuleName is the same as Module, fortunately...
+ let hit2 = delListFromUFM hit1 (map linkableModName new_linkables)
+
+ -- When (verb >= 2) $
+ -- putStrLn (showSDoc (text "Valid linkables:"
+ -- <+> ppr valid_linkables))
+
-- Figure out a stable set of modules which can be retained
-- the top level envs, to avoid upsweeping them. Goes to a
-- bit of trouble to avoid upsweeping module cycles.
-- Travel upwards, over the sccified graph. For each scc
-- of modules ms, add ms to S only if:
-- 1. All home imports of ms are either in ms or S
- -- 2. All m <- ms satisfy P, where
- -- P | interactive = have old summary for m and it indicates
- -- that the source is unchanged
- -- | batch = linkable exists on disk, and is younger
- -- than source.
+ -- 2. A valid old linkable exists for each module in ms
- (stable_mods, linkables_for_stable_mods)
- <- preUpsweep ghci_mode ui1 mg1 mg2unsorted_names [] [] mg2_with_srcimps
- let stable_old_summaries
- = concatMap (findInSummaries mg1) stable_mods
+ stable_mods <- preUpsweep valid_old_linkables
+ mg2unsorted_names [] mg2_with_srcimps
+
+ let stable_summaries
+ = concatMap (findInSummaries mg2unsorted) stable_mods
+
+ stable_linkables
+ = filter (\m -> linkableModName m `elem` stable_mods)
+ valid_old_linkables
when (verb >= 2) $
- putStrLn (showSDoc (text "STABLE MODULES:"
+ putStrLn (showSDoc (text "Stable modules:"
<+> sep (map (text.moduleNameUserString) stable_mods)))
+ -- unload any modules which are going to be re-linked this
+ -- time around.
+ pls2 <- CmLink.unload ghci_mode dflags stable_linkables pls1
- let (hst2, hit2, [])
- = retainInTopLevelEnvs stable_mods (hst1, hit1, [])
- ui2
- = linkables_for_stable_mods
-
- -- Now hst2, hit2, ui2 now hold the 'reduced system', just the set of
- -- modules which are stable.
+ -- we can now glom together our linkable sets
+ let valid_linkables = valid_old_linkables ++ new_linkables
-- We could at this point detect cycles which aren't broken by
- -- a source-import, and complain immediately, but it seems better
- -- to let upsweep_mods do this, so at least some useful work gets
+ -- a source-import, and complain immediately, but it seems better
+ -- to let upsweep_mods do this, so at least some useful work gets
-- done before the upsweep is abandoned.
let upsweep_these
= filter (\scc -> any (`notElem` stable_mods)
- (map name_of_summary (flattenSCC scc)))
+ (map modSummaryName (flattenSCC scc)))
mg2
--hPutStrLn stderr "after tsort:\n"
-- Now do the upsweep, calling compile for each module in
-- turn. Final result is version 3 of everything.
- let threaded2 = CmThreaded pcs1 hst2 hit2
+ let threaded2 = CmThreaded pcs1 hst1 hit2
+
+ -- clean up between compilations
+ let cleanup = cleanTempFilesExcept verb
+ (ppFilesFromSummaries (flattenSCCs upsweep_these))
(upsweep_complete_success, threaded3, modsUpswept, newLis)
- <- upsweep_mods ghci_mode dflags ui2 reachable_from
- threaded2 upsweep_these
+ <- upsweep_mods ghci_mode dflags valid_linkables reachable_from
+ threaded2 cleanup upsweep_these
- let ui3 = add_to_ui ui2 newLis
+ let ui3 = add_to_ui valid_linkables newLis
let (CmThreaded pcs3 hst3 hit3) = threaded3
-- At this point, modsUpswept and newLis should have the same
-- with some object on disk ???)
-- Get in in a roughly top .. bottom order (hence reverse).
- let modsDone = reverse modsUpswept ++ stable_old_summaries
+ let modsDone = reverse modsUpswept ++ stable_summaries
-- Try and do linking in some form, depending on whether the
-- upsweep was completely or only partially successful.
-- Easy; just relink it all.
do when (verb >= 2) $
hPutStrLn stderr "Upsweep completely successful."
- linkresult
- <- link ghci_mode dflags a_root_is_Main ui3 pls1
- case linkresult of
- LinkErrs _ _
- -> panic "cmLoadModule: link failed (1)"
- LinkOK pls3
- -> do let pcms3 = PersistentCMState { hst=hst3, hit=hit3,
- ui=ui3, mg=modsDone,
- gmode=ghci_mode }
- let cmstate3
- = CmState { pcms=pcms3, pcs=pcs3, pls=pls3 }
- return (cmstate3, True,
- map name_of_summary modsDone)
+
+ -- 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
+
+ cmLoadFinish True linkresult
+ hst3 hit3 ui3 modsDone ghci_mode pcs3
else
-- Tricky. We need to back out the effects of compiling any
hPutStrLn stderr "Upsweep partially successful."
let modsDone_names
- = map name_of_summary modsDone
+ = map modSummaryName modsDone
let mods_to_zap_names
- = findPartiallyCompletedCycles modsDone_names mg2_with_srcimps
- let (hst4, hit4, ui4)
- = removeFromTopLevelEnvs mods_to_zap_names (hst3,hit3,ui3)
+ = findPartiallyCompletedCycles modsDone_names
+ mg2_with_srcimps
let mods_to_keep
- = filter ((`notElem` mods_to_zap_names).name_of_summary) modsDone
- let mods_to_keep_names
- = map name_of_summary mods_to_keep
- -- we could get the relevant linkables by filtering newLis, but
- -- it seems easier to drag them out of the updated, cleaned-up UI
- let linkables_to_link
- = map (unJust "linkables_to_link" . findModuleLinkable_maybe ui4)
- mods_to_keep_names
-
- linkresult <- link ghci_mode dflags False linkables_to_link pls1
- case linkresult of
- LinkErrs _ _
- -> panic "cmLoadModule: link failed (2)"
- LinkOK pls4
- -> do let pcms4 = PersistentCMState { hst=hst4, hit=hit4,
- ui=ui4, mg=mods_to_keep,
- gmode=ghci_mode }
- let cmstate4
- = CmState { pcms=pcms4, pcs=pcs3, pls=pls4 }
- return (cmstate4, False,
- mods_to_keep_names)
+ = filter ((`notElem` mods_to_zap_names).modSummaryName)
+ modsDone
+
+ let (hst4, hit4, ui4)
+ = retainInTopLevelEnvs (map modSummaryName mods_to_keep)
+ (hst3,hit3,ui3)
+
+ -- clean up after ourselves
+ cleanTempFilesExcept verb (ppFilesFromSummaries mods_to_keep)
+
+ -- link everything together
+ linkresult <- link ghci_mode dflags False ui4 pls2
+
+ cmLoadFinish False linkresult
+ hst4 hit4 ui4 mods_to_keep ghci_mode pcs3
+
+
+-- Finish up after a cmLoad.
+-- If the link failed, unload everything and return.
+cmLoadFinish ok (LinkFailed pls) hst hit ui mods ghci_mode pcs = do
+ dflags <- getDynFlags
+ new_pls <- CmLink.unload ghci_mode dflags [] pls
+ new_state <- cmInit ghci_mode
+ return (new_state{ pcs=pcs, pls=new_pls }, False, [])
+-- Empty the interactive context and set the module context to the topmost
+-- newly loaded module, or the Prelude if none were loaded.
+cmLoadFinish ok (LinkOK pls) hst hit ui mods ghci_mode pcs
+ = do let new_cmstate = CmState{ hst=hst, hit=hit, ui=ui, mg=mods,
+ gmode=ghci_mode, pcs=pcs, pls=pls,
+ ic = emptyInteractiveContext }
+ mods_loaded = map (moduleNameUserString.modSummaryName) mods
+ return (new_cmstate, ok, mods_loaded)
+
+-- used to fish out the preprocess output files for the purposes
+-- of cleaning up.
+ppFilesFromSummaries summaries
+ = [ fn | Just fn <- map toPpFile summaries ]
+ where
+ toPpFile sum
+ | hspp /= ml_hs_file loc = hspp
+ | otherwise = Nothing
+ where
+ loc = ms_location sum
+ hspp = ml_hspp_file loc
+
+
+-----------------------------------------------------------------------------
+-- getValidLin
+
+-- For each module (or SCC of modules), we take:
+--
+-- - an on-disk linkable, if this is the first time around and one
+-- is available.
+--
+-- - the old linkable, otherwise (and if one is available).
+--
+-- and we throw away the linkable if it is older than the source
+-- file. We ignore the on-disk linkables unless all of the dependents
+-- of this SCC also have on-disk linkables.
+--
+-- If a module has a valid linkable, then it may be STABLE (see below),
+-- and it is classified as SOURCE UNCHANGED for the purposes of calling
+-- compile.
+--
+-- ToDo: this pass could be merged with the preUpsweep.
+
+getValidLinkables
+ :: [Linkable] -- old linkables
+ -> [ModuleName] -- all home modules
+ -> [SCC ModSummary] -- all modules in the program, dependency order
+ -> IO ( [Linkable], -- still-valid linkables
+ [Linkable] -- new linkables we just found
+ )
+
+getValidLinkables old_linkables all_home_mods module_graph = do
+ ls <- foldM (getValidLinkablesSCC old_linkables all_home_mods)
+ [] module_graph
+ return (partition_it ls [] [])
+ where
+ partition_it [] valid new = (valid,new)
+ partition_it ((l,b):ls) valid new
+ | b = partition_it ls valid (l:new)
+ | otherwise = partition_it ls (l:valid) new
+
+
+getValidLinkablesSCC old_linkables all_home_mods new_linkables scc0
+ = let
+ scc = flattenSCC scc0
+ scc_names = map modSummaryName scc
+ home_module m = m `elem` all_home_mods && m `notElem` scc_names
+ scc_allhomeimps = nub (filter home_module (concatMap ms_imps scc))
+ -- NB. ms_imps, not ms_allimps above. We don't want to
+ -- force a module's SOURCE imports to be already compiled for
+ -- its object linkable to be valid.
+
+ has_object m =
+ case findModuleLinkable_maybe (map fst new_linkables) m of
+ Nothing -> False
+ Just l -> isObjectLinkable l
+
+ objects_allowed = all has_object scc_allhomeimps
+ in do
+
+ new_linkables'
+ <- foldM (getValidLinkable old_linkables objects_allowed) [] scc
+
+ -- since an scc can contain only all objects or no objects at all,
+ -- we have to check whether we got all objects or not, and re-do
+ -- the linkable check if not.
+ new_linkables' <-
+ if objects_allowed
+ && not (all isObjectLinkable (map fst new_linkables'))
+ then foldM (getValidLinkable old_linkables False) [] scc
+ else return new_linkables'
+
+ return (new_linkables ++ new_linkables')
+
+
+getValidLinkable :: [Linkable] -> Bool -> [(Linkable,Bool)] -> ModSummary
+ -> IO [(Linkable,Bool)]
+ -- True <=> linkable is new
+getValidLinkable old_linkables objects_allowed new_linkables summary
+ = do let mod_name = modSummaryName summary
+
+ maybe_disk_linkable
+ <- if (not objects_allowed)
+ then return Nothing
+
+ else case ml_obj_file (ms_location summary) of
+ Just obj_fn -> maybe_getFileLinkable mod_name obj_fn
+ Nothing -> return Nothing
+
+ let old_linkable = findModuleLinkable_maybe old_linkables mod_name
+
+ new_linkables' =
+ case (old_linkable, maybe_disk_linkable) of
+ (Nothing, Nothing) -> []
+
+ -- new object linkable just appeared
+ (Nothing, Just l) -> up_to_date l True
+
+ (Just l, Nothing)
+ | isObjectLinkable l -> []
+ -- object linkable disappeared! In case we need to
+ -- relink the module, disregard the old linkable and
+ -- just interpret the module from now on.
+ | otherwise -> up_to_date l False
+ -- old byte code linkable
+
+ (Just l, Just l')
+ | not (isObjectLinkable l) -> up_to_date l False
+ -- if the previous linkable was interpreted, then we
+ -- ignore a newly compiled version, because the version
+ -- numbers in the interface file will be out-of-sync with
+ -- our internal ones.
+ | linkableTime l' > linkableTime l -> up_to_date l' True
+ | linkableTime l' == linkableTime l -> up_to_date l False
+ | otherwise -> []
+ -- on-disk linkable has been replaced by an older one!
+ -- again, disregard the previous one.
+
+ up_to_date l b
+ | linkableTime l < ms_hs_date summary = []
+ | otherwise = [(l,b)]
+ -- why '<' rather than '<=' above? If the filesystem stores
+ -- times to the nearset second, we may occasionally find that
+ -- the object & source have the same modification time,
+ -- especially if the source was automatically generated
+ -- and compiled. Using >= is slightly unsafe, but it matches
+ -- make's behaviour.
+
+ return (new_linkables' ++ new_linkables)
+
+
+maybe_getFileLinkable :: ModuleName -> FilePath -> IO (Maybe Linkable)
+maybe_getFileLinkable mod obj_fn
+ = do obj_exist <- doesFileExist obj_fn
+ if not obj_exist
+ then return Nothing
+ else
+ do let stub_fn = case splitFilename3 obj_fn of
+ (dir, base, ext) -> dir ++ "/" ++ base ++ ".stub_o"
+ stub_exist <- doesFileExist stub_fn
+ obj_time <- getModificationTime obj_fn
+ if stub_exist
+ then return (Just (LM obj_time mod [DotO obj_fn, DotO stub_fn]))
+ else return (Just (LM obj_time mod [DotO obj_fn]))
+
+
+-----------------------------------------------------------------------------
-- Do a pre-upsweep without use of "compile", to establish a
--- (downward-closed) set of stable modules which can be retained
--- in the top-level environments. Also return linkables for those
--- modules determined to be stable, since (in Batch mode, at least)
--- there's no other way for them to get into UI.
-preUpsweep :: GhciMode
- -> [Linkable] -- linkables from previous cmLoadModule pass
- -- should be [] in batch mode
- -> [ModSummary] -- summaries from previous cmLoadModule pass
- -- should be [] in batch mode
- -> [ModuleName] -- names of all mods encountered in downsweep
- -> [ModuleName] -- accumulating stable modules
- -> [Linkable] -- their linkables, in batch mode
+-- (downward-closed) set of stable modules for which we won't call compile.
+
+-- a stable module:
+-- * has a valid linkable (see getValidLinkables above)
+-- * depends only on stable modules
+-- * has an interface in the HIT (interactive mode only)
+
+preUpsweep :: [Linkable] -- new valid linkables
+ -> [ModuleName] -- names of all mods encountered in downsweep
+ -> [ModuleName] -- accumulating stable modules
-> [SCC ModSummary] -- scc-ified mod graph, including src imps
- -> IO ([ModuleName], [Linkable])
- -- stable modules and their linkables
+ -> IO [ModuleName] -- stable modules
-preUpsweep ghci_mode old_lis old_summaries all_home_mods stable lis []
- = return (stable, lis)
-preUpsweep ghci_mode old_lis old_summaries all_home_mods stable lis (scc0:sccs)
+preUpsweep valid_lis all_home_mods stable [] = return stable
+preUpsweep valid_lis all_home_mods stable (scc0:sccs)
= do let scc = flattenSCC scc0
scc_allhomeimps :: [ModuleName]
scc_allhomeimps
all_imports_in_scc_or_stable
= all in_stable_or_scc scc_allhomeimps
scc_names
- = map name_of_summary scc
+ = map modSummaryName scc
in_stable_or_scc m
- = --trace (showSDoc (text "ISOS" <+> ppr m <+> ppr scc_names <+> ppr stable)) (
- m `elem` scc_names || m `elem` stable
- --)
- (all_scc_stable, more_lis)
- <- if not all_imports_in_scc_or_stable
- then do --putStrLn ("PART1 fail " ++ showSDoc (ppr scc_allhomeimps <+> ppr (filter (not.in_stable_or_scc) scc_allhomeimps)))
- return (False, [])
- else do bools_n_lis
- <- mapM (is_stable ghci_mode old_lis old_summaries) scc
- let (bools, liss) = unzip bools_n_lis
- --when (not (and bools)) (putStrLn ("PART2 fail: " ++ showSDoc (ppr scc_names)))
- return (and bools, concat liss)
- if not all_scc_stable
- then preUpsweep ghci_mode old_lis old_summaries all_home_mods stable lis sccs
- else preUpsweep ghci_mode old_lis old_summaries all_home_mods
- (scc_names++stable) (more_lis++lis) sccs
+ = m `elem` scc_names || m `elem` stable
+
+ -- now we check for valid linkables: each module in the SCC must
+ -- have a valid linkable (see getValidLinkables above).
+ has_valid_linkable new_summary
+ = isJust (findModuleLinkable_maybe valid_lis modname)
+ where modname = modSummaryName new_summary
+
+ scc_is_stable = all_imports_in_scc_or_stable
+ && all has_valid_linkable scc
+
+ if scc_is_stable
+ then preUpsweep valid_lis all_home_mods (scc_names++stable) sccs
+ else preUpsweep valid_lis all_home_mods stable sccs
-- Helper for preUpsweep. Assuming that new_summary's imports are all
-- stable, and, if so, in batch mode, return its linkable.
findInSummaries :: [ModSummary] -> ModuleName -> [ModSummary]
findInSummaries old_summaries mod_name
- = [s | s <- old_summaries, name_of_summary s == mod_name]
-
-is_stable :: GhciMode
- -> [Linkable] -> [ModSummary] -- OLD lis and summs, in Interactive mode
- -> ModSummary -- this module
- -> IO (Bool, [Linkable])
-
-is_stable Interactive old_lis old_summaries new_summary
- -- Only true if the old summary exists and
- -- the new source date matches the old one.
- = case found_old_summarys of
- [] -> return (False, old_linkable)
- (old_summary:_)
- -> case (ms_hs_date new_summary, ms_hs_date old_summary) of
- (Just d1, Just d2) -> return (d1 == d2, old_linkable)
- (_, _ ) -> return (False, old_linkable)
- where
- old_linkable
- = maybeToList
- (findModuleLinkable_maybe old_lis (name_of_summary new_summary))
- found_old_summarys
- = findInSummaries old_summaries (name_of_summary new_summary)
-
-is_stable Batch [] [] new_summary
- -- Only true if we can find a linkable, and it is younger than
- -- the source time.
- = case ms_hs_date new_summary of
- Nothing -> return (False, []) -- no source date (?!)
- Just hs_time
- -> case ml_obj_file (ms_location new_summary) of
- Nothing -> return (False, []) -- no obj filename
- Just fn
- -> do maybe_li <- maybe_getFileLinkable
- (moduleName (ms_mod new_summary)) fn
- case maybe_li of
- Nothing -> return (False, []) -- no object file on disk
- Just li -> return (linkableTime li >= hs_time, [li])
-
+ = [s | s <- old_summaries, modSummaryName s == mod_name]
+findModInSummaries :: [ModSummary] -> Module -> Maybe ModSummary
+findModInSummaries old_summaries mod
+ = case [s | s <- old_summaries, ms_mod s == mod] of
+ [] -> Nothing
+ (s:_) -> Just s
-- Return (names of) all those in modsDone who are part of a cycle
-- as defined by theGraph.
chew [] = []
chew ((AcyclicSCC v):rest) = chew rest -- acyclic? not interesting.
chew ((CyclicSCC vs):rest)
- = let names_in_this_cycle = nub (map name_of_summary vs)
+ = let names_in_this_cycle = nub (map modSummaryName vs)
mods_in_this_cycle
= nub ([done | done <- modsDone,
done `elem` names_in_this_cycle])
else chewed_rest
--- Does this ModDetails export Main.main?
---exports_main :: ModDetails -> Bool
---exports_main md
--- = isJust (lookupNameEnv (md_types md) mainName)
-
-
-- Add the given (LM-form) Linkables to the UI, overwriting previous
-- versions if they exist.
add_to_ui :: UnlinkedImage -> [Linkable] -> UnlinkedImage
add_to_ui ui lis
- = foldr add1 ui lis
+ = filter (not_in lis) ui ++ lis
where
- add1 :: Linkable -> UnlinkedImage -> UnlinkedImage
- add1 li ui
- = li : filter (\li2 -> not (for_same_module li li2)) ui
-
- for_same_module :: Linkable -> Linkable -> Bool
- for_same_module li1 li2
- = not (is_package_linkable li1)
- && not (is_package_linkable li2)
- && modname_of_linkable li1 == modname_of_linkable li2
+ not_in :: [Linkable] -> Linkable -> Bool
+ not_in lis li
+ = all (\l -> linkableModName l /= mod) lis
+ where mod = linkableModName li
data CmThreaded -- stuff threaded through individual module compilations
-- There better had not be any cyclic groups here -- we check for them.
upsweep_mods :: GhciMode
-> DynFlags
- -> UnlinkedImage -- old linkables
+ -> UnlinkedImage -- valid linkables
-> (ModuleName -> [ModuleName]) -- to construct downward closures
-> CmThreaded -- PCS & HST & HIT
+ -> IO () -- how to clean up unwanted tmp files
-> [SCC ModSummary] -- mods to do (the worklist)
-- ...... RETURNING ......
-> IO (Bool{-complete success?-},
[ModSummary], -- mods which succeeded
[Linkable]) -- new linkables
-upsweep_mods ghci_mode dflags oldUI reachable_from threaded
+upsweep_mods ghci_mode dflags oldUI reachable_from threaded cleanup
[]
= return (True, threaded, [], [])
-upsweep_mods ghci_mode dflags oldUI reachable_from threaded
+upsweep_mods ghci_mode dflags oldUI reachable_from threaded cleanup
((CyclicSCC ms):_)
= do hPutStrLn stderr ("Module imports form a cycle for modules:\n\t" ++
- unwords (map (moduleNameUserString.name_of_summary) ms))
+ unwords (map (moduleNameUserString.modSummaryName) ms))
return (False, threaded, [], [])
-upsweep_mods ghci_mode dflags oldUI reachable_from threaded
+upsweep_mods ghci_mode dflags oldUI reachable_from threaded cleanup
((AcyclicSCC mod):mods)
= do --case threaded of
-- CmThreaded pcsz hstz hitz
(threaded1, maybe_linkable)
<- upsweep_mod ghci_mode dflags oldUI threaded mod
- (reachable_from (name_of_summary mod))
+ (reachable_from (modSummaryName mod))
+
+ -- remove unwanted tmp files between compilations
+ cleanup
+
case maybe_linkable of
Just linkable
-> -- No errors; do the rest
do (restOK, threaded2, modOKs, linkables)
<- upsweep_mods ghci_mode dflags oldUI reachable_from
- threaded1 mods
+ threaded1 cleanup mods
return (restOK, threaded2, mod:modOKs, linkable:linkables)
Nothing -- we got a compilation error; give up now
-> return (False, threaded1, [], [])
-- Compile a single module. Always produce a Linkable for it if
-- successful. If no compilation happened, return the old Linkable.
-maybe_getFileLinkable :: ModuleName -> FilePath -> IO (Maybe Linkable)
-maybe_getFileLinkable mod_name obj_fn
- = do obj_exist <- doesFileExist obj_fn
- if not obj_exist
- then return Nothing
- else
- do let stub_fn = case splitFilename3 obj_fn of
- (dir, base, ext) -> dir ++ "/" ++ base ++ ".stub_o"
- stub_exist <- doesFileExist stub_fn
- obj_time <- getModificationTime obj_fn
- if stub_exist
- then return (Just (LM obj_time mod_name [DotO obj_fn, DotO stub_fn]))
- else return (Just (LM obj_time mod_name [DotO obj_fn]))
-
-
upsweep_mod :: GhciMode
-> DynFlags
-> UnlinkedImage
-> [ModuleName]
-> IO (CmThreaded, Maybe Linkable)
-upsweep_mod ghci_mode dflags oldUI threaded1 summary1 reachable_from_here
+upsweep_mod ghci_mode dflags oldUI threaded1 summary1 reachable_inc_me
= do
- let mod_name = name_of_summary summary1
- let verb = verbosity dflags
-
- when (verb == 1) $
- if (ghci_mode == Batch)
- then hPutStr stderr (prog_name ++ ": module "
- ++ moduleNameUserString mod_name
- ++ ": ")
- else hPutStr stderr ("Compiling "
- ++ moduleNameUserString mod_name
- ++ " ... ")
+ let mod_name = modSummaryName summary1
let (CmThreaded pcs1 hst1 hit1) = threaded1
let old_iface = lookupUFM hit1 mod_name
- let maybe_oldUI_linkable = findModuleLinkable_maybe oldUI mod_name
- maybe_oldDisk_linkable
- <- case ml_obj_file (ms_location summary1) of
- Nothing -> return Nothing
- Just obj_fn -> maybe_getFileLinkable mod_name obj_fn
-
- -- The most recent of the old UI linkable or whatever we could
- -- find on disk. Is returned as the linkable if compile
- -- doesn't think we need to recompile.
- let maybe_old_linkable
- = case (maybe_oldUI_linkable, maybe_oldDisk_linkable) of
- (Nothing, Nothing) -> Nothing
- (Nothing, Just di) -> Just di
- (Just ui, Nothing) -> Just ui
- (Just ui, Just di)
- | linkableTime ui >= linkableTime di -> Just ui
- | otherwise -> Just di
-
- let compilation_mandatory
- = case maybe_old_linkable of
- Nothing -> True
- Just li -> case ms_hs_date summary1 of
- Nothing -> panic "compilation_mandatory:no src date"
- Just src_date -> src_date >= linkableTime li
- source_unchanged
- = not compilation_mandatory
+ let maybe_old_linkable = findModuleLinkable_maybe oldUI mod_name
+
+ source_unchanged = isJust maybe_old_linkable
+
+ reachable_only = filter (/= (modSummaryName summary1))
+ reachable_inc_me
+ -- in interactive mode, all home modules below us *must* have an
+ -- interface in the HIT. We never demand-load home interfaces in
+ -- interactive mode.
(hst1_strictDC, hit1_strictDC, [])
- = retainInTopLevelEnvs
- (filter (/= (name_of_summary summary1)) reachable_from_here)
- (hst1,hit1,[])
+ = ASSERT(ghci_mode == Batch ||
+ all (`elemUFM` hit1) reachable_only)
+ retainInTopLevelEnvs reachable_only (hst1,hit1,[])
old_linkable
= unJust "upsweep_mod:old_linkable" maybe_old_linkable
+ have_object
+ | Just l <- maybe_old_linkable, isObjectLinkable l = True
+ | otherwise = False
+
compresult <- compile ghci_mode summary1 source_unchanged
- old_iface hst1_strictDC hit1_strictDC pcs1
+ have_object old_iface hst1_strictDC hit1_strictDC pcs1
case compresult of
- -- Compilation "succeeded", but didn't return a new
- -- linkable, meaning that compilation wasn't needed, and the
- -- new details were manufactured from the old iface.
- CompOK pcs2 new_details new_iface Nothing
- -> do let hst2 = addToUFM hst1 mod_name new_details
- hit2 = addToUFM hit1 mod_name new_iface
- threaded2 = CmThreaded pcs2 hst2 hit2
-
- if ghci_mode == Interactive && verb >= 1 then
- -- if we're using an object file, tell the user
- case maybe_old_linkable of
- Just (LM _ _ objs@(DotO _:_))
- -> do hPutStr stderr (showSDoc (space <>
- parens (hsep (text "using":
- punctuate comma
- [ text o | DotO o <- objs ]))))
- when (verb > 1) $ hPutStrLn stderr ""
- _ -> return ()
- else
- return ()
-
- when (verb == 1) $ hPutStrLn stderr ""
- return (threaded2, Just old_linkable)
-
- -- Compilation really did happen, and succeeded. A new
- -- details, iface and linkable are returned.
- CompOK pcs2 new_details new_iface (Just new_linkable)
+ -- Compilation "succeeded", and may or may not have returned a new
+ -- linkable (depending on whether compilation was actually performed
+ -- or not).
+ CompOK pcs2 new_details new_iface maybe_new_linkable
-> do let hst2 = addToUFM hst1 mod_name new_details
hit2 = addToUFM hit1 mod_name new_iface
threaded2 = CmThreaded pcs2 hst2 hit2
- when (verb == 1) $ hPutStrLn stderr ""
- return (threaded2, Just new_linkable)
+ return (threaded2, if isJust maybe_new_linkable
+ then maybe_new_linkable
+ else Just old_linkable)
-- Compilation failed. compile may still have updated
-- the PCS, tho.
CompErrs pcs2
-> do let threaded2 = CmThreaded pcs2 hst1 hit1
- when (verb == 1) $ hPutStrLn stderr ""
return (threaded2, Nothing)
--- Remove unwanted modules from the top level envs (HST, HIT, UI).
-removeFromTopLevelEnvs :: [ModuleName]
- -> (HomeSymbolTable, HomeIfaceTable, UnlinkedImage)
- -> (HomeSymbolTable, HomeIfaceTable, UnlinkedImage)
-removeFromTopLevelEnvs zap_these (hst, hit, ui)
- = (delListFromUFM hst zap_these,
- delListFromUFM hit zap_these,
- filterModuleLinkables (`notElem` zap_these) ui
- )
-
+-- Filter modules in the top level envs (HST, HIT, UI).
retainInTopLevelEnvs :: [ModuleName]
-> (HomeSymbolTable, HomeIfaceTable, UnlinkedImage)
-> (HomeSymbolTable, HomeIfaceTable, UnlinkedImage)
downwards_closure_of_module :: [ModSummary] -> ModuleName -> [ModuleName]
downwards_closure_of_module summaries root
= let toEdge :: ModSummary -> (ModuleName,[ModuleName])
- toEdge summ = (name_of_summary summ, ms_allimps summ)
- res = simple_transitive_closure (map toEdge summaries) [root]
+ toEdge summ = (modSummaryName summ,
+ filter (`elem` all_mods) (ms_allimps summ))
+
+ all_mods = map modSummaryName summaries
+
+ res = simple_transitive_closure (map toEdge summaries) [root]
in
- --trace (showSDoc (text "DC of mod" <+> ppr root
- -- <+> text "=" <+> ppr res)) (
+-- trace (showSDoc (text "DC of mod" <+> ppr root
+-- <+> text "=" <+> ppr res)) $
res
- --)
-- Calculate transitive closures from a set of roots given an adjacency list
simple_transitive_closure :: Eq a => [(a,[a])] -> [a] -> [a]
= let
toEdge :: ModSummary -> (ModSummary,ModuleName,[ModuleName])
toEdge summ
- = (summ, name_of_summary summ,
+ = (summ, modSummaryName summ,
(if include_source_imports
then ms_srcimps summ else []) ++ ms_imps summ)
sccs
+-----------------------------------------------------------------------------
+-- Downsweep (dependency analysis)
+
-- Chase downwards from the specified root set, returning summaries
-- for all home modules encountered. Only follow source-import
--- links. Also returns a Bool to indicate whether any of the roots
--- are module Main.
-downsweep :: [FilePath] -> IO ([ModSummary], Bool)
-downsweep rootNm
- = do rootSummaries <- mapM getRootSummary rootNm
- let a_root_is_Main
- = any ((=="Main").moduleNameUserString.name_of_summary)
- rootSummaries
+-- links.
+
+-- We pass in the previous collection of summaries, which is used as a
+-- cache to avoid recalculating a module summary if the source is
+-- unchanged.
+
+downsweep :: [FilePath] -> [ModSummary] -> IO [ModSummary]
+downsweep roots old_summaries
+ = do rootSummaries <- mapM getRootSummary roots
all_summaries
- <- loop (filter (isHomeModule.ms_mod) rootSummaries)
- return (all_summaries, a_root_is_Main)
+ <- loop (concat (map ms_imps rootSummaries))
+ (mkModuleEnv [ (mod, s) | s <- rootSummaries,
+ let mod = ms_mod s, isHomeModule mod
+ ])
+ return all_summaries
where
getRootSummary :: FilePath -> IO ModSummary
getRootSummary file
- | haskellish_file file
+ | haskellish_src_file file
= do exists <- doesFileExist file
if exists then summariseFile file else do
- throwDyn (OtherError ("can't find file `" ++ file ++ "'"))
+ throwDyn (CmdLineError ("can't find file `" ++ file ++ "'"))
| otherwise
= do exists <- doesFileExist hs_file
if exists then summariseFile hs_file else do
exists <- doesFileExist lhs_file
if exists then summariseFile lhs_file else do
- getSummary (mkModuleName file)
+ let mod_name = mkModuleName file
+ maybe_summary <- getSummary mod_name
+ case maybe_summary of
+ Nothing -> packageModErr mod_name
+ Just s -> return s
where
hs_file = file ++ ".hs"
lhs_file = file ++ ".lhs"
- getSummary :: ModuleName -> IO ModSummary
+ getSummary :: ModuleName -> IO (Maybe ModSummary)
getSummary nm
- -- | trace ("getSummary: "++ showSDoc (ppr nm)) True
= do found <- findModule nm
case found of
- -- Be sure not to use the mod and location passed in to
- -- summarise for any other purpose -- summarise may change
- -- the module names in them if name of module /= name of file,
- -- and put the changed versions in the returned summary.
- -- These will then conflict with the passed-in versions.
- Just (mod, location) -> summarise mod location
- Nothing -> throwDyn (OtherError
+ Just (mod, location) -> do
+ let old_summary = findModInSummaries old_summaries mod
+ summarise mod location old_summary
+
+ Nothing -> throwDyn (CmdLineError
("can't find module `"
++ showSDoc (ppr nm) ++ "'"))
-
- -- loop invariant: homeSummaries doesn't contain package modules
- loop :: [ModSummary] -> IO [ModSummary]
- loop homeSummaries
- = do let allImps :: [ModuleName]
- allImps = (nub . concatMap ms_imps) homeSummaries
- let allHome -- all modules currently in homeSummaries
- = map (moduleName.ms_mod) homeSummaries
- let neededImps
- = filter (`notElem` allHome) allImps
- neededSummaries
- <- mapM getSummary neededImps
- let newHomeSummaries
- = filter (isHomeModule.ms_mod) neededSummaries
- if null newHomeSummaries
- then return homeSummaries
- else loop (newHomeSummaries ++ homeSummaries)
+ -- loop invariant: env doesn't contain package modules
+ loop :: [ModuleName] -> ModuleEnv ModSummary -> IO [ModSummary]
+ loop [] env = return (moduleEnvElts env)
+ loop imps env
+ = do -- imports for modules we don't already have
+ let needed_imps = nub (filter (not . (`elemUFM` env)) imps)
+
+ -- summarise them
+ needed_summaries <- mapM getSummary needed_imps
+
+ -- get just the "home" modules
+ let new_home_summaries = [ s | Just s <- needed_summaries ]
+
+ -- loop, checking the new imports
+ let new_imps = concat (map ms_imps new_home_summaries)
+ loop new_imps (extendModuleEnvList env
+ [ (ms_mod s, s) | s <- new_home_summaries ])
-----------------------------------------------------------------------------
-- Summarising modules
-- We have two types of summarisation:
--
--- * Summarise a file. This is used for the root module passed to
--- cmLoadModule. The file is read, and used to determine the root
+-- * Summarise a file. This is used for the root module(s) passed to
+-- cmLoadModules. The file is read, and used to determine the root
-- module name. The module name may differ from the filename.
--
-- * Summarise a module. We are given a module name, and must provide
summariseFile :: FilePath -> IO ModSummary
summariseFile file
= do hspp_fn <- preprocess file
- modsrc <- readFile hspp_fn
+ (srcimps,imps,mod_name) <- getImportsFromFile hspp_fn
- let (srcimps,imps,mod_name) = getImports modsrc
- (path, basename, ext) = splitFilename3 file
+ let (path, basename, _ext) = splitFilename3 file
- Just (mod, location)
+ (mod, location)
<- mkHomeModuleLocn mod_name (path ++ '/':basename) file
-
- maybe_src_timestamp
+
+ src_timestamp
<- case ml_hs_file location of
- Nothing -> return Nothing
- Just src_fn -> maybe_getModificationTime src_fn
+ Nothing -> noHsFileErr mod_name
+ Just src_fn -> getModificationTime src_fn
return (ModSummary mod
location{ml_hspp_file=Just hspp_fn}
- srcimps imps
- maybe_src_timestamp)
+ srcimps imps src_timestamp)
--- Summarise a module, and pick up source and interface timestamps.
-summarise :: Module -> ModuleLocation -> IO ModSummary
-summarise mod location
- | isHomeModule mod
+-- Summarise a module, and pick up source and timestamp.
+summarise :: Module -> ModuleLocation -> Maybe ModSummary
+ -> IO (Maybe ModSummary)
+summarise mod location old_summary
+ | not (isHomeModule mod) = return Nothing
+ | otherwise
= do let hs_fn = unJust "summarise" (ml_hs_file location)
+
+ case ml_hs_file location of {
+ Nothing -> noHsFileErr mod;
+ Just src_fn -> do
+
+ src_timestamp <- getModificationTime src_fn
+
+ -- return the cached summary if the source didn't change
+ case old_summary of {
+ Just s | ms_hs_date s == src_timestamp -> return (Just s);
+ _ -> do
+
hspp_fn <- preprocess hs_fn
- modsrc <- readFile hspp_fn
- let (srcimps,imps,mod_name) = getImports modsrc
+ (srcimps,imps,mod_name) <- getImportsFromFile hspp_fn
- maybe_src_timestamp
- <- case ml_hs_file location of
- Nothing -> return Nothing
- Just src_fn -> maybe_getModificationTime src_fn
+ when (mod_name /= moduleName mod) $
+ throwDyn (ProgramError
+ (showSDoc (text hs_fn
+ <> text ": file name does not match module name"
+ <+> quotes (ppr (moduleName mod)))))
- if mod_name == moduleName mod
- then return ()
- else throwDyn (OtherError
- (showSDoc (text "file name does not match module name: "
- <+> ppr (moduleName mod) <+> text "vs"
- <+> ppr mod_name)))
+ return (Just (ModSummary mod location{ml_hspp_file=Just hspp_fn}
+ srcimps imps src_timestamp))
+ }
+ }
- return (ModSummary mod location{ml_hspp_file=Just hspp_fn}
- srcimps imps
- maybe_src_timestamp)
- | otherwise
- = return (ModSummary mod location [] [] Nothing)
-
-maybe_getModificationTime :: FilePath -> IO (Maybe ClockTime)
-maybe_getModificationTime fn
- = (do time <- getModificationTime fn
- return (Just time))
- `catch`
- (\err -> return Nothing)
+noHsFileErr mod
+ = throwDyn (CmdLineError (showSDoc (text "no source file for module" <+> quotes (ppr mod))))
+
+packageModErr mod
+ = throwDyn (CmdLineError (showSDoc (text "module" <+>
+ quotes (ppr mod) <+>
+ text "is a package module")))
\end{code}
projects / ghc-hetmet.git / blobdiff